US20050121857A1 - Device for sealing a passage through a wall - Google Patents
Device for sealing a passage through a wall Download PDFInfo
- Publication number
- US20050121857A1 US20050121857A1 US10/489,970 US48997005A US2005121857A1 US 20050121857 A1 US20050121857 A1 US 20050121857A1 US 48997005 A US48997005 A US 48997005A US 2005121857 A1 US2005121857 A1 US 2005121857A1
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- United States
- Prior art keywords
- chamber
- shaft
- liquid
- wall
- space
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/406—Sealings between relatively-moving surfaces by means of fluid by at least one pump
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/40—Sealings between relatively-moving surfaces by means of fluid
- F16J15/42—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by centrifugal force
Definitions
- the present invention refers to a device according to the preamble of claim 1 , and a method according to the preamble of claim 25 .
- the invention is particularly suitable for sealing between a substantially stationary wall and a rotating shaft extending through a passage in the wall. Examples of application areas are ships and a propeller shaft extending through the hull of the ship. Also other application areas are possible.
- DE-A-1955016 discloses such a device for sealing a passage through a wall between a first space, which is arranged to contain a gas, and a second space, which is arranged to contain a gas, and a second space, which is arranged to contain a liquid.
- a rotating turbine shaft extends in the passage through the wall and is journalled in a shaft bearing having a gap extending around the shaft between the shaft and the wall.
- a rotating disc is rigidly arranged on the shaft and extends outwardly from the shaft.
- a stationary wall in the form of a further disc is provided between the shaft bearing and the rotating disc. The stationary disc is designed in such a way that it forms a space between the two discs.
- supply conduits are provided for the supply of liquid to this space via two nozzles. The liquid forms a rotating liquid ring in the space.
- DE 4212169 discloses a labyrinth sealing having a channel between a rotating part and a stationary disc.
- the channel may be supplied with oil via a supply channel, wherein a liquid level will be formed in the channel due to the rotation of the disc.
- GB 1284596 also discloses a labyrinth sealing with feeding of liquid into a space formed by flange members from a rotating rotor.
- a stationary disc extends into the space and includes channels for said feeding of liquid and for discharging liquid from the space.
- the object of the present invention is to provide a device enabling a sufficient sealing of a passage for a rotating shaft.
- the device initially defined which is characterised in that it includes means arranged to force said liquid in the chamber to rotate at a rotary speed which substantially exceeds the rotary speed of the shaft.
- the wall is stationary and consists, for instance, of a wall element of a ship or a stationary plant.
- the chamber is arranged to permit that a part of said liquid flows into the chamber and at least partly is retained in the chamber for said sealing of the passage. Consequently, the liquid proper to be sealed off will form a sealing liquid body which prevents said media transport through the passage.
- said means are arranged to provide said rotation in the chamber between the disc and the first space. Consequently, the rotating liquid body is formed in an outer part of the chamber between the disc and the first space. The disc will thus prevent liquid from flowing straight forward from the second space to the first space. The liquid will instead be forced to the radially outer part of the chamber, i.e. to the blocking liquid body.
- said means include a blade member arranged to rotate independently of the shaft.
- said means include a drive member, which is arranged to rotate the blade member at a rotary speed which is higher than the rotary speed of the shaft.
- the blade member may be rotatably carried by a bearing member which is connected to at least one of the shaft, the disc and the wall.
- the blade member includes at least one set of blades which are arranged in the chamber.
- the blade member may include a rotor member which extends outwardly in the chamber.
- the rotor member may include one or two such sets of blades.
- One such rotor member may be annular and extend around the shaft, wherein the blades are arranged on the rotor member and uniformly distributed around the shaft.
- the blade member includes a first set of blades, which are arranged on the rotor member and turned towards the first space, and a second set of blades, which are arranged on the rotor member and turned towards the disc.
- the rotor member includes a rotor of an electric motor having a stator which is provided outside the chamber.
- the stator and the electric connections may thus be located outside the chamber and in the first space.
- the blade member forms the chamber.
- the blade member may then advantageously include a first set of blades, which are arranged on a first limiting wall of the chamber and turned towards the disc, and a second set of blades, which are arranged on a second limiting wall of the chamber and turned towards the first limiting wall.
- said means are arranged to supply liquid to the chamber at such a speed and direction that the liquid in the chamber is forced to said rotation.
- Such means may include at least one nozzle for said liquid supply, wherein said nozzle extends in a substantially tangential direction into the chamber, and a pump for providing said liquid supply.
- the chamber includes several part chambers, which are arranged between the gap and the first space, and extend around the shaft, and two rotatable discs, which are rigidly connected to the shaft and extend outwardly from the shaft in a respective one of said part chambers, wherein each of said part chambers is arranged to contain liquid.
- said part chambers may be arranged to permit a part of said liquid to flow into the part chambers and at least partly be retained for sealing of the passage.
- the device is arranged to permit liquid to flow from the chamber to the second space. In such a way it is ensured that liquid not may flow from the chamber into the first space.
- the device may then include a wall portion, which partly defines the chamber and extends outwardly from the gap.
- the chamber may, between the disc and the wall portion, form an outlet channel, which is arranged to reduce the speed of the liquid flowing from the chamber to the second space. In such a way it is possible to regain pressure and thus reduce the energy consumption of the device.
- the outlet channel may extend from a radially outer position at the periphery of the disc to a radially inner position in the proximity of the shaft.
- guide vanes may be arranged in the outlet channel for conveying the liquid flowing from the chamber to the second space.
- said guide vanes are arranged on the wall portion.
- the object is also achieved by the method defined in the independent claim 25 .
- FIG. 1 discloses a device according to a first embodiment of the invention.
- FIG. 2 discloses a device according to a second embodiment of the invention.
- FIG. 3 discloses a device according to a third embodiment of the invention.
- FIG. 4 discloses a set of blades of the device in FIG. 3 .
- FIG. 5 discloses a device according to a fourth embodiment of the invention.
- FIG. 6 discloses a set of guide vanes of the device in FIG. 5 .
- FIG. 7 discloses a device according to a fifth embodiment of the invention.
- FIGS. 1, 2 , 3 , 5 and 7 disclose different embodiments of a device for sealing a passage 1 through a wall 2 between a first space 3 , which is arranged to contain a gas, and a second space 4 , which is arranged to contain a liquid.
- the wall 2 may form a stationary wall element of a ship or of a stationary plant.
- a rotatable shaft 5 for instance a propeller shaft of a ship, extends in the passage 1 through the wall 2 in such a way that a gap is formed, which extends around the shaft 5 between the shaft 5 and the wall 2 .
- the shaft 5 is rotatable around the rotary axis x.
- the device according to the invention includes a chamber 8 , which is provided between the first space 3 and the second space 4 , and more precisely between the first space 3 and said gap of the passage 1 .
- the chamber 8 is annular and extends around the shaft 5 .
- the chamber 8 is formed of a first limiting wall 11 , a second limiting wall 12 and a third limiting wall 13 .
- the three limiting walls 11 , 12 , 13 thus enclose the chamber 8 .
- the first limiting wall 11 and the second limiting wall 12 extend substantially radially outwardly and in parallel to each other.
- the third limiting wall 13 extends substantially coaxially with the shaft 5 and between a radially outer end of the first limiting wall 11 and a radially outer end of the second limiting wall 12 .
- the limiting walls 11 , 12 , 13 are fixed in relation to the stationary wall 2 .
- the device also includes a rotatable disc 14 , which is fixedly arranged on the shaft 5 .
- the disc 9 extends substantially radially outwardly from the shaft 5 into the chamber 8 and divides the chamber 8 in a first part volume 8 a and a second part volume 8 b.
- Liquid from the second space 4 may thus via the passage 1 and said gap flow from the second space 4 into the chamber 8 . Consequently, the chamber 8 will contain liquid.
- the device includes different means, which are to be explained more closely in connection with the description of various embodiments and which are arranged to prevent liquid from flowing through the chamber 8 to the first space 3 by forcing the liquid in the chamber 8 to rotate at a relatively high rotary speed, i.e. a rotary speed substantially exceeding the rotary speed of the shaft 5 .
- the rotating liquid will thus form a rotating liquid body in the first part volume 8 a of the chamber 8 between the disc 14 and the first limiting wall 11 .
- said means include a blade member 15 , which includes a rotor member in the form of a rotatable disc 16 and two sets of blades 17 ′, 17 ′′.
- the first set of blades 17 ′ are provided on one side of the rotatable disc 16 and the second set of blades 17 ′′ are provided on the other side of the rotatable disc 16 .
- the rotatable disc 16 is provided on a cylindrical support member 18 of the blade member 15 .
- the support member 18 is substantially concentrically arranged around the shaft with regard to the rotary axis x.
- the rotatable disc 16 extends substantially radially outwardly in the chamber 8 from the support member 18 between the disc 14 and the first limiting wall 11 of the chamber 8
- the first set of blades 17 ′ are thus turned towards the disc 14 and the second set of blades 17 ′′ are turned towards the first limiting wall 11 .
- the blade member 15 includes also two sealing members 19 ′, 19 ′′. A first such sealing member 19 ′ is turned towards the disc 14 and a second sealing member 19 ′′ is turned towards the first limiting wall 11 .
- the sealing members 19 ′, 19 ′′ are designed in such a way that they do not abut the disc 14 and the first limiting wall 11 , respectively, when the blade member 15 rotates, but will abut sealingly the disc 14 and the limiting wall 11 , respectively, when the blade member 15 is still standing and liquid flows from the second space 4 towards the first space 3 .
- the blade member 15 is according to the first embodiment rotatably carried by the shaft 5 by means of a bearing member 21 , which is provided between and connected to the cylindrical support member 18 and the stationary wall 2 via a substantially cylindrical projection 22 of the first limiting wall 11 .
- the blade member 15 is rotated independently of the shaft 5 by means of a schematically disclosed drive motor 23 , which via a drive belt 24 or any other power transmission member is connected to the cylindrical support member 18 .
- the drive motor 23 is thus arranged to rotate the blade member 15 at a rotary speed which is higher than the rotary speed of the shaft 5 , and in such a way create a rotating liquid body in the radially outer part of the chamber 8 .
- the level of the rotating liquid is marked by the arrow 25 .
- the device is arranged to permit liquid to flow from the chamber 8 , and more precisely from the second part volume 8 b of the chamber 8 , to the second space 4 .
- the second part volume 8 b is thus located between the disc 14 and the second limiting wall 12 forming a wall portion 30 extending substantially radially outwardly from the gap mentioned above.
- the second part volume 8 b and the gap thus form an outlet channel, which extends from a radially outer position at the periphery of the disc 14 to a radially inner position in the proximity of the shaft 5 .
- FIG. 2 discloses a second embodiment where the blade member 15 forms the chamber 8 which thus is rotatable.
- the chamber 8 in the second embodiment thus is formed of a separate wall element 11 , 12 , 13 , which is rotatable around the shaft 5 independently of the rotation of the shaft 5 and which also includes a first limiting wall 11 , a second limiting wall 12 and a third limiting wall 13 .
- the limiting walls 11 and 12 extend substantially radially outwardly and in parallel to each other, and the limiting wall 13 extends substantially coaxially with the shaft 5 and between a radially outer end of the limiting walls 11 and 12 .
- the disc 14 extends substantially radially outwardly from the shaft 5 and into the chamber 8 .
- a wall portion 30 extends substantially radially outwardly from said gap and substantially in parallel with the disc 14 .
- the wall portion 30 is rigidly connected to the stationary wall 2 .
- the second part volume 8 b of the chamber 8 and thus an outlet channel for liquid from the radially outer part of the chamber 8 is formed between the disc 14 and the wall portion 30 .
- the first part volume 8 a is formed partly between the first limiting wall 11 and the disc 14 and partly between the second limiting wall 12 and the wall portion 30 .
- the blade member 15 includes a first set of blades 17 ′, which are arranged on the first limiting wall 11 and turned towards the disc 13 , and a second set of blades 17 ′′, which are arranged on the second limiting wall 12 and turned towards the wall portion 30 .
- the first set of blades 17 ′ and the second set of blades 17 ′′ thus create a rotating liquid body in a radially outer part of the respective part volume 8 a, so that liquid extends to the level indicated by the arrows 25 .
- the blade member 15 is according to the second embodiment rotatably carried by the stationary wall 2 by means of a first bearing member 21 ′, which is arranged between and connected to the stationary wall 2 and a substantially cylindrical projection 31 of the first limiting wall 11 , and a second bearing member 21 ′′, which is arranged between and connected to the stationary wall 2 and a substantially cylindrical projection 32 of the second limiting wall 12 .
- a first sealing member 19 ′ is arranged between the first substantially cylindrical projection 31 and the shaft 5 in such a way that the first sealing member 19 ′ does not abut the shaft 5 when the blade member 15 rotates but only when the blade member 15 is still standing.
- a second sealing member 19 ′′ is arranged between the second substantially cylindrical projection 32 and a substantially cylindrical part 33 of the stationary wall 2 .
- the substantially cylindrical part 33 extends substantially concentrically from the wall portion 30 between the shaft 5 and the projection 32 , wherein said gap is formed between the part 33 and the shaft 5 .
- the sealing member 19 ′′ does not abut the part 32 when the blade member 15 rotates but only when the blade member 15 is still standing.
- FIGS. 3 and 4 disclose a third embodiment where the blade member 15 includes an annular rotor 40 of an electric motor.
- the blade member 10 and the rotor 40 are provided in the chamber 8 and more precisely in the first part volume 8 a.
- the chamber 8 is formed by a first limiting wall 11 , a second limiting wall 12 and a third limiting wall 13 , which thus enclose the chamber 8 .
- the three limiting walls 11 , 12 , 13 are rigidly connected to the stationary wall.
- the electric motor also includes a stator 41 , which has a winding 42 and which is arranged outside the chamber 8 , and more precisely outside the first limiting wall 13 .
- the electric motor may for instance be an asynchronous motor or a so-called PMSM-motor.
- the blade member 15 is rotatably carried by the shaft 5 by means of a first bearing member 21 ′ and a second bearing member 22 ′. No sealing members are disclosed in FIG. 3 , but may for instance be arranged between the shaft 5 and the substantially cylindrical projections 43 , 44 of the limiting walls 11 and 22 , respectively.
- the blade member 15 includes a first set of blades 17 ′, which are arranged on the rotor 40 and turned towards the first limiting wall 11 , and a second set of blades 17 ′′, which are arranged on the rotor 40 and turned towards the disc 14 .
- FIG. 4 discloses schematically an example of a set of blades 17 ′′ of the third embodiment.
- the blades 17 ′′ are arranged on an annular carrier 45 which is mounted on the annular rotor 40 .
- FIG. 5 discloses a fourth embodiment of the invention.
- the chamber 8 is also here formed by a first limiting wall 11 , a second limiting wall 12 and a third limiting wall 13 .
- the three limiting walls 11 , 12 , 13 thus enclose the chamber 8 and are fixedly connected to the stationary wall 2 .
- said means are arranged to supply liquid to the first part volume 8 a of the chamber 8 at such a speed and direction that the liquid in the chamber 8 is forced to rotate at a rotary speed exceeding the rotary speed of the shaft 5 .
- the means include a set of nozzles 50 for said liquid supply.
- the nozzles 50 extend in a substantially tangential direction into the chamber 8 seen in an axial section.
- the liquid is supplied to the nozzles 50 by means of a schematically disclosed pump 51 via conduit members 52 .
- a sealing member 19 is arranged between the first limiting wall 11 and the shaft 5 .
- the outlet channel mentioned above which partly is formed by the second part volume 8 b of the embodiments disclosed, is arranged to reduce the speed of the liquid flowing from the chamber 8 to the second space 4 .
- the outlet channel extends from a radially outer position at the periphery of the disc 14 to a radially inner position in the proximity of the shaft 5 .
- guide vanes 60 of the type disclosed in FIG. 6 may be arranged in the outlet channel for conveying the liquid flowing from the chamber 8 to the second space 8 b.
- the guide vanes 60 are arranged on the second limiting wall 12 , forming a wall portion 30 , and in the second embodiment on the wall portion 30 .
- the device according to the first and third embodiments may be provided with such guide vanes.
- FIG. 7 discloses a fifth embodiment, which differs from the other embodiments by the fact that the chamber 8 includes three part chambers 8 ′, 8 ′′ and 8 ′′′. Except for this difference, the construction and the function of the device according to the fifth embodiment in FIG. 7 is similar to the construction and the function of the second embodiment in FIG. 2 .
- the part chambers 8 ′, 8 ′′ and 8 ′′′ have been formed by means of two intermedient walls 71 and 72 , which are provided with blades 17 ′′′ and 17 ′′′′, respectively, and which extend substantially radially inwardly from the third limiting wall 13 .
- the fifth embodiment includes two rotatable discs 14 ′ and 14 ′′ which extend into a respective part chamber 8 ′ and 8 ′′, respectively, and two wall portions 30 ′ and 30 ′′, which are provided with guide vanes 60 ′ and 60 ′′, respectively, which correspond to the guide vanes 60 in FIG. 2 .
- the wall portions 30 ′ and 30 ′′ extend substantially radially outwardly from the cylindrical part 33 and into a respective part chamber 8 ′′ and 8 ′′′, respectively.
- the central part chamber 8 ′′ includes the second part volume 8 b and is thus substantially identical to the chamber in FIG. 2 , whereas the part chamber 8 ′ merely receives the disc 14 ′ and the part chamber 8 ′′′ merely receives the wall portion 30 ′′.
- the chamber 8 may include another number part chambers than appears from the embodiments disclosed. For instance, it may include the two part chambers 8 ′ and 8 ′′, and the two rotatable discs 14 ′ and 14 ′′, but merely one wall portion 30 ′. Also other configurations are possible and especially it is to be noted that the chamber 8 may include more than three part chambers disclosed.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Centrifugal Separators (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Seal Device For Vehicle (AREA)
- Mechanical Sealing (AREA)
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
Abstract
The invention refers to a device for sealing a passage (1) through a stationary wall (2) between a first space (3), which is arranged to contain a liquid. A rotatable shaft (5) is intended to extend in the passage through the wall in such a way that a gap is formed, which extends around the shaft between the shaft and the wall. A chamber (8), containing liquid, is arranged between the gap and the first space and extends around the axis. A rotatable disc (14) is fixedly arranged on the shaft and exends outwardly from the shaft into said chamber. Means (17′, 17″) are arranged to force the liquid in the chamber to rotate at a rotary speed substantially exceeding the rotary speed of the shaft.
Description
- The present invention refers to a device according to the preamble of
claim 1, and a method according to the preamble ofclaim 25. The invention is particularly suitable for sealing between a substantially stationary wall and a rotating shaft extending through a passage in the wall. Examples of application areas are ships and a propeller shaft extending through the hull of the ship. Also other application areas are possible. - DE-A-1955016 discloses such a device for sealing a passage through a wall between a first space, which is arranged to contain a gas, and a second space, which is arranged to contain a gas, and a second space, which is arranged to contain a liquid. A rotating turbine shaft extends in the passage through the wall and is journalled in a shaft bearing having a gap extending around the shaft between the shaft and the wall. A rotating disc is rigidly arranged on the shaft and extends outwardly from the shaft. A stationary wall in the form of a further disc is provided between the shaft bearing and the rotating disc. The stationary disc is designed in such a way that it forms a space between the two discs. Furthermore, supply conduits are provided for the supply of liquid to this space via two nozzles. The liquid forms a rotating liquid ring in the space.
- DE 4212169 discloses a labyrinth sealing having a channel between a rotating part and a stationary disc. The channel may be supplied with oil via a supply channel, wherein a liquid level will be formed in the channel due to the rotation of the disc.
- GB 1284596 also discloses a labyrinth sealing with feeding of liquid into a space formed by flange members from a rotating rotor. A stationary disc extends into the space and includes channels for said feeding of liquid and for discharging liquid from the space.
- The object of the present invention is to provide a device enabling a sufficient sealing of a passage for a rotating shaft.
- This object is achieved by the device initially defined, which is characterised in that it includes means arranged to force said liquid in the chamber to rotate at a rotary speed which substantially exceeds the rotary speed of the shaft.
- By such means it is possible to ensure in an efficient manner that substantially no liquid will be transported from the second space to the first gas-filled space. The liquid, which rotates at the rotary speed which is higher than the speed of the shaft, forms a liquid body in a radially outer part of the chamber. This liquid body prevents substantially all media transport through the passage. In relation to mechanical sealings the advantage of a low friction and substantially no wear of essential sealing components is of course also achieved. Advantageously, the wall is stationary and consists, for instance, of a wall element of a ship or a stationary plant.
- According to an embodiment of the invention, the chamber is arranged to permit that a part of said liquid flows into the chamber and at least partly is retained in the chamber for said sealing of the passage. Consequently, the liquid proper to be sealed off will form a sealing liquid body which prevents said media transport through the passage.
- According to a further embodiment of the invention, said means are arranged to provide said rotation in the chamber between the disc and the first space. Consequently, the rotating liquid body is formed in an outer part of the chamber between the disc and the first space. The disc will thus prevent liquid from flowing straight forward from the second space to the first space. The liquid will instead be forced to the radially outer part of the chamber, i.e. to the blocking liquid body.
- According to a further embodiment of the invention, said means include a blade member arranged to rotate independently of the shaft. By such a blade member the desired rotation may be achieved in an efficient manner. Advantageously, said means include a drive member, which is arranged to rotate the blade member at a rotary speed which is higher than the rotary speed of the shaft. The blade member may be rotatably carried by a bearing member which is connected to at least one of the shaft, the disc and the wall.
- According to a further embodiment of the invention, the blade member includes at least one set of blades which are arranged in the chamber. Advantageously, the blade member may include a rotor member which extends outwardly in the chamber. The rotor member may include one or two such sets of blades. One such rotor member may be annular and extend around the shaft, wherein the blades are arranged on the rotor member and uniformly distributed around the shaft.
- According to a further embodiment of the invention, the blade member includes a first set of blades, which are arranged on the rotor member and turned towards the first space, and a second set of blades, which are arranged on the rotor member and turned towards the disc.
- According to a further embodiment of the invention, the rotor member includes a rotor of an electric motor having a stator which is provided outside the chamber. The stator and the electric connections may thus be located outside the chamber and in the first space.
- According to a further embodiment of the invention, the blade member forms the chamber. The blade member may then advantageously include a first set of blades, which are arranged on a first limiting wall of the chamber and turned towards the disc, and a second set of blades, which are arranged on a second limiting wall of the chamber and turned towards the first limiting wall.
- According to a further embodiment of the invention, said means are arranged to supply liquid to the chamber at such a speed and direction that the liquid in the chamber is forced to said rotation. Such means may include at least one nozzle for said liquid supply, wherein said nozzle extends in a substantially tangential direction into the chamber, and a pump for providing said liquid supply.
- According to a further embodiment of the invention, the chamber includes several part chambers, which are arranged between the gap and the first space, and extend around the shaft, and two rotatable discs, which are rigidly connected to the shaft and extend outwardly from the shaft in a respective one of said part chambers, wherein each of said part chambers is arranged to contain liquid. Advantageously, said part chambers may be arranged to permit a part of said liquid to flow into the part chambers and at least partly be retained for sealing of the passage.
- According to a further embodiment of the invention, the device is arranged to permit liquid to flow from the chamber to the second space. In such a way it is ensured that liquid not may flow from the chamber into the first space. The device may then include a wall portion, which partly defines the chamber and extends outwardly from the gap. The chamber may, between the disc and the wall portion, form an outlet channel, which is arranged to reduce the speed of the liquid flowing from the chamber to the second space. In such a way it is possible to regain pressure and thus reduce the energy consumption of the device. The outlet channel may extend from a radially outer position at the periphery of the disc to a radially inner position in the proximity of the shaft. In order to further increase the pressure recovering, guide vanes may be arranged in the outlet channel for conveying the liquid flowing from the chamber to the second space. Advantageously, said guide vanes are arranged on the wall portion.
- The object is also achieved by the method defined in the
independent claim 25. - The present invention is not to be explained more closely through a description of various embodiments, shown by way of example, and with reference to the drawings attached hereto.
-
FIG. 1 discloses a device according to a first embodiment of the invention. -
FIG. 2 discloses a device according to a second embodiment of the invention. -
FIG. 3 discloses a device according to a third embodiment of the invention. -
FIG. 4 discloses a set of blades of the device inFIG. 3 . -
FIG. 5 discloses a device according to a fourth embodiment of the invention. -
FIG. 6 discloses a set of guide vanes of the device inFIG. 5 . -
FIG. 7 discloses a device according to a fifth embodiment of the invention. -
FIGS. 1, 2 , 3, 5 and 7 disclose different embodiments of a device for sealing apassage 1 through awall 2 between afirst space 3, which is arranged to contain a gas, and asecond space 4, which is arranged to contain a liquid. Thewall 2 may form a stationary wall element of a ship or of a stationary plant. Arotatable shaft 5, for instance a propeller shaft of a ship, extends in thepassage 1 through thewall 2 in such a way that a gap is formed, which extends around theshaft 5 between theshaft 5 and thewall 2. Theshaft 5 is rotatable around the rotary axis x. - The device according to the invention includes a
chamber 8, which is provided between thefirst space 3 and thesecond space 4, and more precisely between thefirst space 3 and said gap of thepassage 1. Thechamber 8 is annular and extends around theshaft 5. Thechamber 8 is formed of a first limiting wall 11, a second limitingwall 12 and a third limitingwall 13. The three limitingwalls chamber 8. The first limiting wall 11 and the second limitingwall 12 extend substantially radially outwardly and in parallel to each other. The third limitingwall 13 extends substantially coaxially with theshaft 5 and between a radially outer end of the first limiting wall 11 and a radially outer end of the second limitingwall 12. In the first embodiment, the limitingwalls stationary wall 2. - The device also includes a
rotatable disc 14, which is fixedly arranged on theshaft 5. The disc 9 extends substantially radially outwardly from theshaft 5 into thechamber 8 and divides thechamber 8 in afirst part volume 8 a and asecond part volume 8 b. - Liquid from the
second space 4 may thus via thepassage 1 and said gap flow from thesecond space 4 into thechamber 8. Consequently, thechamber 8 will contain liquid. Furthermore, the device includes different means, which are to be explained more closely in connection with the description of various embodiments and which are arranged to prevent liquid from flowing through thechamber 8 to thefirst space 3 by forcing the liquid in thechamber 8 to rotate at a relatively high rotary speed, i.e. a rotary speed substantially exceeding the rotary speed of theshaft 5. The rotating liquid will thus form a rotating liquid body in thefirst part volume 8 a of thechamber 8 between thedisc 14 and the first limiting wall 11. - According to the first embodiment disclosed in
FIG. 1 , said means include ablade member 15, which includes a rotor member in the form of arotatable disc 16 and two sets ofblades 17′, 17″. The first set ofblades 17′ are provided on one side of therotatable disc 16 and the second set ofblades 17″ are provided on the other side of therotatable disc 16. Therotatable disc 16 is provided on acylindrical support member 18 of theblade member 15. Thesupport member 18 is substantially concentrically arranged around the shaft with regard to the rotary axis x. Therotatable disc 16 extends substantially radially outwardly in thechamber 8 from thesupport member 18 between thedisc 14 and the first limiting wall 11 of thechamber 8 The first set ofblades 17′ are thus turned towards thedisc 14 and the second set ofblades 17″ are turned towards the first limiting wall 11. Theblade member 15 includes also two sealingmembers 19′, 19″. A first such sealingmember 19′ is turned towards thedisc 14 and asecond sealing member 19″ is turned towards the first limiting wall 11. The sealingmembers 19′, 19″ are designed in such a way that they do not abut thedisc 14 and the first limiting wall 11, respectively, when theblade member 15 rotates, but will abut sealingly thedisc 14 and the limiting wall 11, respectively, when theblade member 15 is still standing and liquid flows from thesecond space 4 towards thefirst space 3. - The
blade member 15 is according to the first embodiment rotatably carried by theshaft 5 by means of a bearingmember 21, which is provided between and connected to thecylindrical support member 18 and thestationary wall 2 via a substantiallycylindrical projection 22 of the first limiting wall 11. Theblade member 15 is rotated independently of theshaft 5 by means of a schematically discloseddrive motor 23, which via adrive belt 24 or any other power transmission member is connected to thecylindrical support member 18. Thedrive motor 23 is thus arranged to rotate theblade member 15 at a rotary speed which is higher than the rotary speed of theshaft 5, and in such a way create a rotating liquid body in the radially outer part of thechamber 8. The level of the rotating liquid is marked by thearrow 25. - Furthermore, the device is arranged to permit liquid to flow from the
chamber 8, and more precisely from thesecond part volume 8 b of thechamber 8, to thesecond space 4. Thesecond part volume 8 b is thus located between thedisc 14 and the second limitingwall 12 forming awall portion 30 extending substantially radially outwardly from the gap mentioned above. Thesecond part volume 8 b and the gap thus form an outlet channel, which extends from a radially outer position at the periphery of thedisc 14 to a radially inner position in the proximity of theshaft 5. -
FIG. 2 discloses a second embodiment where theblade member 15 forms thechamber 8 which thus is rotatable. It is to be noted that components having substantially the same function have been provided with the same reference signs in the various embodiments. Thechamber 8 in the second embodiment thus is formed of aseparate wall element shaft 5 independently of the rotation of theshaft 5 and which also includes a first limiting wall 11, a second limitingwall 12 and a third limitingwall 13. Also in this embodiment, the limitingwalls 11 and 12 extend substantially radially outwardly and in parallel to each other, and the limitingwall 13 extends substantially coaxially with theshaft 5 and between a radially outer end of the limitingwalls 11 and 12. Thedisc 14 extends substantially radially outwardly from theshaft 5 and into thechamber 8. Awall portion 30 extends substantially radially outwardly from said gap and substantially in parallel with thedisc 14. Thewall portion 30 is rigidly connected to thestationary wall 2. In the second embodiment, thesecond part volume 8 b of thechamber 8 and thus an outlet channel for liquid from the radially outer part of thechamber 8 is formed between thedisc 14 and thewall portion 30. In the second embodiment, thefirst part volume 8 a is formed partly between the first limiting wall 11 and thedisc 14 and partly between the second limitingwall 12 and thewall portion 30. - According to the second embodiment, the
blade member 15 includes a first set ofblades 17′, which are arranged on the first limiting wall 11 and turned towards thedisc 13, and a second set ofblades 17″, which are arranged on the second limitingwall 12 and turned towards thewall portion 30. The first set ofblades 17′ and the second set ofblades 17″ thus create a rotating liquid body in a radially outer part of therespective part volume 8 a, so that liquid extends to the level indicated by thearrows 25. - The
blade member 15 is according to the second embodiment rotatably carried by thestationary wall 2 by means of afirst bearing member 21′, which is arranged between and connected to thestationary wall 2 and a substantiallycylindrical projection 31 of the first limiting wall 11, and asecond bearing member 21″, which is arranged between and connected to thestationary wall 2 and a substantiallycylindrical projection 32 of the second limitingwall 12. A first sealingmember 19′ is arranged between the first substantiallycylindrical projection 31 and theshaft 5 in such a way that the first sealingmember 19′ does not abut theshaft 5 when theblade member 15 rotates but only when theblade member 15 is still standing. Asecond sealing member 19″ is arranged between the second substantiallycylindrical projection 32 and a substantiallycylindrical part 33 of thestationary wall 2. The substantiallycylindrical part 33 extends substantially concentrically from thewall portion 30 between theshaft 5 and theprojection 32, wherein said gap is formed between thepart 33 and theshaft 5. The sealingmember 19″ does not abut thepart 32 when theblade member 15 rotates but only when theblade member 15 is still standing. -
FIGS. 3 and 4 disclose a third embodiment where theblade member 15 includes anannular rotor 40 of an electric motor. The blade member 10 and therotor 40 are provided in thechamber 8 and more precisely in thefirst part volume 8a. Also in this embodiment, thechamber 8 is formed by a first limiting wall 11, a second limitingwall 12 and a third limitingwall 13, which thus enclose thechamber 8. In the same way as in the first embodiment, the three limitingwalls stator 41, which has a winding 42 and which is arranged outside thechamber 8, and more precisely outside the first limitingwall 13. The electric motor may for instance be an asynchronous motor or a so-called PMSM-motor. Theblade member 15 is rotatably carried by theshaft 5 by means of afirst bearing member 21′ and asecond bearing member 22′. No sealing members are disclosed inFIG. 3 , but may for instance be arranged between theshaft 5 and the substantiallycylindrical projections walls 11 and 22, respectively. - The
blade member 15 includes a first set ofblades 17′, which are arranged on therotor 40 and turned towards the first limiting wall 11, and a second set ofblades 17″, which are arranged on therotor 40 and turned towards thedisc 14. -
FIG. 4 discloses schematically an example of a set ofblades 17″ of the third embodiment. Theblades 17″ are arranged on anannular carrier 45 which is mounted on theannular rotor 40. -
FIG. 5 discloses a fourth embodiment of the invention. Thechamber 8 is also here formed by a first limiting wall 11, a second limitingwall 12 and a third limitingwall 13. The three limitingwalls chamber 8 and are fixedly connected to thestationary wall 2. In this embodiment, said means are arranged to supply liquid to thefirst part volume 8 a of thechamber 8 at such a speed and direction that the liquid in thechamber 8 is forced to rotate at a rotary speed exceeding the rotary speed of theshaft 5. The means include a set ofnozzles 50 for said liquid supply. Thenozzles 50 extend in a substantially tangential direction into thechamber 8 seen in an axial section. The liquid is supplied to thenozzles 50 by means of a schematically disclosedpump 51 viaconduit members 52. A sealingmember 19 is arranged between the first limiting wall 11 and theshaft 5. - The outlet channel mentioned above, which partly is formed by the
second part volume 8 b of the embodiments disclosed, is arranged to reduce the speed of the liquid flowing from thechamber 8 to thesecond space 4. The outlet channel extends from a radially outer position at the periphery of thedisc 14 to a radially inner position in the proximity of theshaft 5. By said speed reduction a pressure recovery and thus a lower energy consumption of the device is achieved. In order to further increase the pressure recovery, guidevanes 60 of the type disclosed inFIG. 6 may be arranged in the outlet channel for conveying the liquid flowing from thechamber 8 to thesecond space 8 b. In the fourth embodiment, theguide vanes 60 are arranged on the second limitingwall 12, forming awall portion 30, and in the second embodiment on thewall portion 30. Also the device according to the first and third embodiments may be provided with such guide vanes. -
FIG. 7 discloses a fifth embodiment, which differs from the other embodiments by the fact that thechamber 8 includes threepart chambers 8′, 8″ and 8′″. Except for this difference, the construction and the function of the device according to the fifth embodiment inFIG. 7 is similar to the construction and the function of the second embodiment inFIG. 2 . Thepart chambers 8′, 8″ and 8′″ have been formed by means of twointermedient walls blades 17′″ and 17″″, respectively, and which extend substantially radially inwardly from the third limitingwall 13. Furthermore, the fifth embodiment includes tworotatable discs 14′ and 14″ which extend into arespective part chamber 8′ and 8″, respectively, and twowall portions 30′ and 30″, which are provided withguide vanes 60′ and 60″, respectively, which correspond to theguide vanes 60 inFIG. 2 . Thewall portions 30′ and 30″ extend substantially radially outwardly from thecylindrical part 33 and into arespective part chamber 8″ and 8′″, respectively. Thecentral part chamber 8″ includes thesecond part volume 8 b and is thus substantially identical to the chamber inFIG. 2 , whereas thepart chamber 8′ merely receives thedisc 14′ and thepart chamber 8′″ merely receives thewall portion 30″. It is to be noted that thechamber 8 may include another number part chambers than appears from the embodiments disclosed. For instance, it may include the twopart chambers 8′ and 8″, and the tworotatable discs 14′ and 14″, but merely onewall portion 30′. Also other configurations are possible and especially it is to be noted that thechamber 8 may include more than three part chambers disclosed. - The invention is not limited to the embodiments disclosed but may be varied and modified within the scope of the following claims.
Claims (25)
1-24. (canceled)
25. A device for sealing a passage through a stationary wall between a first space, which is arranged to contain a gas, and a second space, which is arranged to contain a liquid, wherein a rotatable shaft is intended to extend in the passage through the wall in such a way that a gap is formed, which extends around the shaft between the shaft and the wall, a chamber being disposed between the gap and the first space and extending around the shaft, the device comprising:
a rotatable disc fixedly disposed on the shaft and extending outwardly from the shaft into the chamber, wherein the chamber is arranged to contain liquid; and
means for forcing said liquid to rotate in the chamber at a rotary speed which substantially exceeds the rotary speed of the shaft.
26. A device according to claim 25 , wherein the forcing means includes means for providing rotation in the chamber between the disc and the first space.
27. A device according to claim 26 , wherein the forcing means includes a blade member operable to rotate independently of the shaft.
28. A device according to claim 27 , wherein the forcing means includes a drive member operable to rotate the blade member at a rotary speed which is higher than the rotary speed of the shaft.
29. A device according to claim 27 , wherein the blade member is rotatably carried by a bearing member which is connected to at least one of the shaft, the disc, and the wall.
30. A device according to claim 27 , wherein the blade member includes at least one set of blades which are disposed in the chamber.
31. A device according to claim 27 , wherein the blade member includes a rotor member which extends outwardly in the chamber.
32. A device according to claim 31 , wherein the blade member includes a first set of blades disposed on the rotor member and oriented towards the first space, and a second set of blades disposed on the rotor member and oriented towards the disc.
33. A device according to claim 31 , wherein the rotor member includes a rotor of an electric motor having a stator disposed outside the chamber.
34. A device according to claim 27 , wherein the blade member forms the chamber.
35. A device according to claim 34 , wherein the blade member includes a first set of blades disposed on a first limiting wall of the chamber and oriented towards the disc, and a second set of blades disposed on a second limiting wall of the chamber and oriented towards the first limiting wall.
36. A device according to claim 25 , wherein the forcing means supplies liquid to the chamber at a speed and direction sufficient to force the liquid in the chamber to said rotation.
37. A device according to claim 36 , wherein the forcing means includes at least a nozzle for said liquid supply, wherein said nozzle extends in a substantially tangential direction into the chamber.
38. A device according to claim 36 , wherein the forcing means include a pump for providing said liquid supply.
39. A device according to claim 25 , wherein the chamber includes several sub-chambers disposed between the gap and the first space and extending around the shaft, and two rotatable discs rigidly disposed on the shaft and extending outwardly from the shaft into a respective one of said sub-chambers, wherein each of said sub-chambers is arranged to contain liquid.
40. A device according to claim 39 , wherein each sub-chamber is disposed to permit a part of said liquid to flow into the sub-chambers and at least partly be retained for said sealing of the passage.
41. A device according to claim 25 , wherein liquid flows from said chamber to the second space.
42. A device according to claim 25 , further comprising a wall portion which partly defines the chamber and extends outwardly from the gap.
43. A device according to claim 41 , wherein the chamber between the disc and the wall portion forms an outlet channel disposed to reduce the speed of the liquid flowing from the chamber to the second space.
44. A device according to claim 43 , wherein the outlet channel extends from a radially outer position at the periphery of the disc to a radially inner position in proximity to the shaft.
45. A device according to claim 43 , further comprising guide vanes disposed in the outlet channel for conveying the liquid flowing from the chamber to the second space.
46. A device according to claim 45 , wherein the guide vanes are disposed on the wall portion.
47. A device according to claim 43 , wherein the wall portion is rigidly connected to the wall.
48. A method for sealing a passage through a stationary wall between a first space, which contains a gas, and a second space, which contains a liquid, wherein a rotating shaft extends in the passage through the wall in such a way that a gap is formed, which extends around the shaft between the shaft and the wall, wherein the method includes the steps of:
providing a device including a chamber, which is arranged between the gap and the first space and extends around the shaft, and a rotating disc, which is rigidly arranged on the shaft and extends outwardly from the shaft into the chamber, wherein the chamber is arranged to contain liquid, and
forcing said liquid in the chamber to rotate at a rotary speed which substantially exceeds the rotary speed of the shaft.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0103136-8 | 2001-09-20 | ||
SE0103136A SE523230C2 (en) | 2001-09-20 | 2001-09-20 | Device for sealing a passage between a rotatable shaft and a stationary wall. |
PCT/SE2002/001708 WO2003025438A1 (en) | 2001-09-20 | 2002-09-20 | A device for sealing a passage through a wall |
Publications (1)
Publication Number | Publication Date |
---|---|
US20050121857A1 true US20050121857A1 (en) | 2005-06-09 |
Family
ID=20285393
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/489,970 Abandoned US20050121857A1 (en) | 2001-09-20 | 2002-09-20 | Device for sealing a passage through a wall |
Country Status (9)
Country | Link |
---|---|
US (1) | US20050121857A1 (en) |
EP (1) | EP1427954B1 (en) |
JP (1) | JP4317014B2 (en) |
AT (1) | ATE400755T1 (en) |
DE (1) | DE60227539D1 (en) |
DK (1) | DK1427954T3 (en) |
ES (1) | ES2310214T3 (en) |
SE (1) | SE523230C2 (en) |
WO (1) | WO2003025438A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160273386A1 (en) * | 2015-03-19 | 2016-09-22 | United Technologies Corporation | Zero or low leakage oil transfer bearing |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6845987B2 (en) | 2002-09-10 | 2005-01-25 | United Technologies Corporation | Shaft seal |
EP1531294B1 (en) * | 2003-11-12 | 2010-01-06 | United Technologies Corporation | Shaft seal |
DE102005047696A1 (en) * | 2005-09-27 | 2007-03-29 | Rolls-Royce Deutschland Ltd & Co Kg | Siphon-like hydraulic seal for use between e.g. high- and low pressure shafts of aircraft engine, has locking bar movably and axially held at circumference of inner shaft and formed in rotational direction of hydraulic fluid barrier |
DE102014205407A1 (en) * | 2014-03-24 | 2015-09-24 | Robert Bosch Gmbh | Centrifugal seal for a turbomachine |
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GB2125118A (en) * | 1982-08-03 | 1984-02-29 | Rolls Royce | Hydraulic seal |
-
2001
- 2001-09-20 SE SE0103136A patent/SE523230C2/en not_active IP Right Cessation
-
2002
- 2002-09-20 US US10/489,970 patent/US20050121857A1/en not_active Abandoned
- 2002-09-20 JP JP2003529030A patent/JP4317014B2/en not_active Expired - Fee Related
- 2002-09-20 EP EP02773083A patent/EP1427954B1/en not_active Expired - Lifetime
- 2002-09-20 DE DE60227539T patent/DE60227539D1/en not_active Expired - Lifetime
- 2002-09-20 ES ES02773083T patent/ES2310214T3/en not_active Expired - Lifetime
- 2002-09-20 WO PCT/SE2002/001708 patent/WO2003025438A1/en active Application Filing
- 2002-09-20 DK DK02773083T patent/DK1427954T3/en active
- 2002-09-20 AT AT02773083T patent/ATE400755T1/en not_active IP Right Cessation
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160273386A1 (en) * | 2015-03-19 | 2016-09-22 | United Technologies Corporation | Zero or low leakage oil transfer bearing |
US9896969B2 (en) * | 2015-03-19 | 2018-02-20 | United Technologies Corporation | Zero or low leakage oil transfer bearing |
Also Published As
Publication number | Publication date |
---|---|
JP2005503526A (en) | 2005-02-03 |
SE0103136L (en) | 2003-03-21 |
EP1427954A1 (en) | 2004-06-16 |
SE0103136D0 (en) | 2001-09-20 |
EP1427954B1 (en) | 2008-07-09 |
JP4317014B2 (en) | 2009-08-19 |
SE523230C2 (en) | 2004-04-06 |
ATE400755T1 (en) | 2008-07-15 |
WO2003025438A1 (en) | 2003-03-27 |
DK1427954T3 (en) | 2008-11-03 |
DE60227539D1 (en) | 2008-08-21 |
ES2310214T3 (en) | 2009-01-01 |
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Legal Events
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AS | Assignment |
Owner name: ROPLAN DEVELOPMENT CENTER AB, SWEDEN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:ANDERSSON, PER-OLOF;REEL/FRAME:016156/0263 Effective date: 20040607 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |