US20060099068A1 - Axial flow pump - Google Patents
Axial flow pump Download PDFInfo
- Publication number
- US20060099068A1 US20060099068A1 US11/266,239 US26623905A US2006099068A1 US 20060099068 A1 US20060099068 A1 US 20060099068A1 US 26623905 A US26623905 A US 26623905A US 2006099068 A1 US2006099068 A1 US 2006099068A1
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- US
- United States
- Prior art keywords
- impeller
- groove
- combined
- liquid
- cylinder
- 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
Links
- 239000007788 liquid Substances 0.000 claims abstract description 52
- 238000004804 winding Methods 0.000 claims description 10
- 230000007423 decrease Effects 0.000 claims description 4
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 230000002411 adverse Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 230000005415 magnetization Effects 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
- 229910000976 Electrical steel Inorganic materials 0.000 description 1
- 239000004734 Polyphenylene sulfide Substances 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D1/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
- F04D1/025—Comprising axial and radial stages
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/12—Combinations of two or more pumps
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D3/00—Axial-flow pumps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
Abstract
Disclosed is an axial flow pump including a combined impeller integrally formed of an axial impeller and a centrifugal impeller, the axial impeller being composed of a first cylinder on which a first groove is formed, the centrifugal impeller being composed of a second cylinder on which a second groove is formed. The second groove is smoothly connected with the first groove and a distance between a bottom surface of the second groove and a centerline of the second cylinder gradually increases to prevent turbulent flow of liquid which may occur at the connection point between first and second grooves thereby achieving a high pump performance and a decreased external size of the pump.
Description
- This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2004-321469 filed on Nov. 5, 2004, the contents of which are incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a pump for transporting liquid and more particularly to an axial flow pump having a combined impeller including an axial impeller and centrifugal impeller.
- 2. Description of the Related Art
- Conventionally, a pump including an impeller is employed to transport liquid. As an example of the pump, Japanese patent application Kokai publication No. 2000-262404 discloses an axial flow pump in which an impeller formed to seemingly combine an axial impeller with a centrifugal impeller is provided. In the pump including the axial and centrifugal impellers, rotation of the axial impeller causes liquid taken from an inlet port to move in a direction along with a centerline of the axial impeller and rotation of the centrifugal impeller subsequently causes the liquid to discharge from an outlet port in a centrifugal direction substantially perpendicular to the centerline of the axial impeller.
- When the liquid transported by the axial impeller reaches the centrifugal impeller, a traveling direction of the liquid suddenly changes from the direction along with the centerline of the axial impeller to the centrifugal direction. Due to this rapid change, a turbulent flow of the liquid occurs. This turbulent flow of the liquid causes deterioration in the liquid discharge performance by the pump.
- To prevent the turbulent flow phenomenon, a rectifier plate may be is needed to be set where the turbulent flow occurs. However, such installation of the rectifier plate may also cause complexity in the entire structure of the impeller and increase in the external size of the pump, as well.
- Accordingly, it is an object of the present invention to prevent a turbulent flow of liquid in an axial flow pump.
- It is another object of the invention to provide a unique structure of a combined impeller including an axial impeller and a centrifugal impeller in an axial flow pump.
- To accomplish the above-described objects, an axial flow pump comprises a housing having a cylindrical wall defining a liquid passage inside the housing, the housing having opposite sides; an inlet port, formed at one side of the housing, which is fluidly communicated with the passage; an outlet port, formed at the other side of the housing, which is fluidly communicated the passage; and a combined impeller rotatably arranged along a center line of the cylindrical wall to forcibly generate flow of the liquid through the inlet port and discharge the liquid out of the outlet port, the combined impeller including an axial impeller and a centrifugal impeller which are located, in order, along the passage from the inlet port to the outlet port, the axial impeller being composed of a first cylinder having a first outer diameter and a first groove spirally formed on the first cylinder, and the centrifugal impeller being composed of a second cylinder having a second outer diameter larger than the first outer diameter and a second groove spirally formed on the second cylinder, wherein the second groove is smoothly connected with the first groove through a connection point and the second groove is shaped such that a distance between a bottom surface of the second groove and a rotational center of the centrifugal impeller gradually increases from the connection point in a direction opposite to the rotational direction of the combined impeller.
-
FIG. 1 is a longitudinal cross sectional view of a pump in a first embodiment of the present invention. -
FIG. 2 is a block diagram showing a circuit for driving the pump. -
FIG. 3 is a perspective view with a part of longitudinal cross section of a combined impeller employed in a pump of the first embodiment. -
FIG. 4 is a perspective view of the combined impeller of the first embodiment. -
FIG. 5 is a plan view of the combined impeller of the first embodiment. -
FIG. 6 is a perspective view of a combined impeller employed in a second embodiment of the present invention. -
FIG. 7 is a plan view of the combined impeller of the second embodiment. -
FIG. 8 is a graph showing a relation among area ratio of a forcing surface to an entire surface of a second groove, pump performance of discharging air taken in liquid, and degree of a load affecting the pump. -
FIG. 9 is a perspective view of the combined impeller of a third embodiment. - Preferred embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. However, the same numerals are applied to the similar elements in the drawings, and therefore, the detailed descriptions thereof are not repeated.
- A first embodiment of the present invention will now be described with reference to
FIGS. 1 through 5 . -
FIG. 1 is a longitudinal cross sectional view of an axial flow pump 1 which transports liquid. The pump 1 includes ahousing 3 having a cylindrical can 12 that has opposite sides and defines aliquid passage 2 therein. The pump 1 also has a combinedimpeller 4 rotatably arranged along a centerline of the cylindrical can 12. Aninlet port 5 at one side of thehousing 3 and anoutlet port 6 at the other side of thehousing 3 are respectively formed to fluidly communicate with theliquid passage 2. Rotation of the combinedimpeller 4 forcibly generates flow of the liquid along theliquid passage 2 through theinlet port 5 and discharges the liquid out of theoutlet port 6. - To rotate the combined
impeller 4,around the centerline, astator 7 is arranged in thehousing 3 to be opposite to the combinedimpeller 4 through the cylindrical can 12. Thestator 7 is formed of astator core 8, a plurality ofwindings 9, andbobbins 10. Thestator core 8 is formed by laminating a plurality of silicon steel plates each shaped in a circular disk such that sixprojections 8 a protruding toward a centerline of the cylindrical can 12 are radially allocated by 60 degrees. The sixwindings 9 are set on therespective projections 8 a, separating three pairs each serially connected. One of the pairs of thewindings 9 is aligned on two projections opposite to each other. The three pairs of thewindings 9 are sequentially energized by supplying a driving current to magnetize therespective projections 8 a. - As shown in
FIG. 2 , the driving current is sequentially supplied from adriving unit 30 to the pairs ofwindings 9 so that the combinedimpeller 4 rotates by an associated operation between magnetization of therespective projections 8 a in sequence and permanent magnet provided in the combined impeller as described below. Thebobbin 10 provided between the winding 9 and theprojection 8 a is made of an insulating material to insulate both of them. - Between the
bobbin 10 andprojection 8 a a clearance is formed, andsilicon grease 11 having a viscosity and thermal conductivity is introduced into the clearance. Thesilicon grease 11 is a gelled oil based material containing alumina powder having a high thermal conductivity to fill the clearance. - The cylindrical can 12 defining the
liquid passage 2 in thehousing 3 keeps the liquid away from contacting with thestator 7. In addition to the waterproof of thestator 7, since the cylindrical can 12 is made of highly thermal conductive material, such as metal, heat generated by thestator 7 travels through the cylindrical can 12 to the liquid passing through theliquid passage 2 thereby cooling thestator 7. - In the cylindrical can 12, a part of the combined impeller is arranged as described later. The combined
impeller 4 has ashaft 16 which is rotatably supported by twoball bearings inlet port 5 side and theoutlet port 6 side of thehousing 3. - The combined
impeller 4 is to be integrally formed, as a one piece, of anaxial impeller 13 and acentrifugal impeller 14. Theaxial impeller 13 is located inside the cylindrical can 12 at one side of thehousing 3 where theinlet port 6 is arranged. Thecentrifugal impeller 14 is located at the other side of thehousing 3 where theoutlet port 6 is arranged. When the combinedimpeller 4 rotates by the magnetization of theprojections 8 a, the liquid drawing via theinlet port 5 travels through the axial andcentrifugal impellers - The axial impeller is composed of a
first cylinder 13 a having a first outer diameter slightly smaller than an inner diameter of the cylindrical can 12 and afirst groove 13 b spirally formed on a periphery of thefirst cylinder 13 a. Thecentrifugal impeller 14 is composed of asecond cylinder 14 a having a second outer diameter larger than the first outer diameter and asecond groove 14 b spirally formed on a periphery of thesecond cylinder 14 a. Thefirst groove 13 b and thesecond groove 14 b are smoothly connected as described later. - In general, it may be understood that a groove is defined by opposite walls and a bottom surface between walls. In this embodiment, however, as shown in
FIGS. 4 and 5 , one of the walls of the groove is eliminated to simplify the structure and the bottom wall of thehousing 3 facing thecentrifugal impeller 14 acts as the other wall of the groove in view of the operation of the pump. Therefore, in this embodiment, such modified groove having one wall and a bottom surface is also called as a groove. - In
FIG. 3 the combinedimpeller 4 is manufactured by molding polyphenylene sulfide to integrally form the axial andcentrifugal impellers axial impeller 13 includes tworotor cores 26 and apermanent magnet 25 which locates between the cores to generate magnetic poles on the rotor cores. When molding, tworotor cores 26 are positioned into theaxial impeller 13 such that the magnetic poles of therotor cores 26 face, via the cylindrical can 12, to theprojections 8 a provided with thewindings 9 when the pump is assembled. Therotor cores 26 are radially allocated about a centerline of the combinedimpeller 4 such that different magnetic poles are alternately placed by 90 degrees. - As shown in
FIG. 4 , thefirst groove 13 b on theaxial impeller 13 is shaped such that a distance between abottom surface 13 c of thefirst groove 13 b and a rotational center of theaxial impeller 13 is uniformed over the entire region of thefirst groove 13 b. Thefirst groove 13 b is also spirally shaped at an angle ranging from 12 to 25 degrees with respect to the centerline of theaxial impeller 13. - The
second groove 14 b on thecentrifugal impeller 14 is smoothly connected with thefirst groove 13 b through a connection point A as indicated inFIG. 4 . Thesecond groove 14 b is spirally and extendedly shaped such that a distance between abottom surface 14 c of thesecond groove 14 b and a rotational center of thecentrifugal impeller 14 gradually increases from the connection point A in a direction opposite to the rotational direction of the combinedimpeller 4. At the connection point A between thefirst groove 13 b and thesecond groove 14 b, thebottom surface 13 c of thefirst groove 13 b is smoothly connected with thebottom surface 14 c of thesecond groove 14 b. Because thesecond groove 14 b is spirally and extendedly formed on thesecond cylinder 14 a as stated above, atermination edge 14 d emerges at a position that thesecond groove 14 b terminates on thesecond cylinder 14 a. Besides, owing to the spirally formed groove, a width B, B′ of thebottom surface 14 c of thesecond groove 14 b in a direction along the center line of the combinedimpeller 4 gradually decreases toward the bottomsurface termination edge 14 d. - In the pump 1 described above, the combined
impeller 4 can be driven in a rotational direction as indicated by an arrow C inFIGS. 4 and 5 by means of the drivingunit 30 that supplies a driving current to the respective pairs ofwindings 9 to sequentially change the magnetic poles of therespective projections 8 a in thestator 7. - By the rotation of the combined
impeller 4, liquid is taken through theinlet port 5, carried through thefirst groove 13 a on theaxial impeller 13 and then transferred from thefirst groove 13 a to thesecond groove 14 b via the connection point A without generating a turbulent flow of the liquid at the connection point A. This is because that a flow direction of the liquid is gradually and smoothly changed at the connection point A toward a centrifugal direction indicated by an arrow D by thebottom surface 14 c of thesecond groove 14 b as the combined impeller 4 (centrifugal impeller) rotates. After that, the flow direction of the liquid is further changed from the centrifugal direction to the rotational direction of the combinedimpeller 4 as the centrifugal impeller further rotates because of the absence of side wall extending from the can 12 and then the liquid is discharged from theoutlet port 6. - In respect to a method of manufacturing the combined
impeller 4 in this embodiment, a molding method is employed to integrally form the axial andcentrifugal impellers second grooves - The pump including the aforementioned combined impeller achieves a smooth liquid transfer without occurrence of turbulent flow at the connection point A from the axial impeller to the centrifugal impeller. Due to a unique structure of the combined impeller, applying a rectifier plate between an axial and centrifugal impellers is not needed to achieve a smooth liquid transfer. Therefore, performance of the pump can be improved without the rectifier plate.
- As the rectifier plate and room for setting the rectifier plate are not needed, the external size of the pump can be decreased compared with a pump which employs such rectifier plate.
- Besides, as indicated by B and B′ in
FIG.4 , since a width of thebottom surface 14 c of thesecond groove 14 b in a direction along the center line of the cylindrical wall gradually decreases toward a direction opposite to the rotational direction of the combined impeller, load adversely affecting the rotation of the combinedimpeller 4 which otherwise increases as the combinedimpeller 4 rotates can be alleviated. - A second embodiment of the present invention is described with reference to
FIGS. 6 through 8 .FIG. 6 is a perspective view of a modified combinedimpeller 20 employed in an axial flow pump of this embodiment.FIG. 7 is a plan view of the combinedimpeller 20. - A combined
impeller 20 of the second embodiment is housed in thehousing 3 shown inFIG. 1 , instead of the combinedimpeller 4. A difference between the first embodiment and the second embodiment is a structure of the combined impeller. In particular, a major difference between the combinedimpeller 4 of the first embodiment and the combinedimpeller 20 of the second embodiment is a structure of thecentrifugal impeller 14A. Therefore, description will be given only to the structure of the combinedimpeller 20. - The combined
impeller 20 is integrally formed, as one piece, of anaxial impeller 13 and acentrifugal impeller 14A. The axial andcentrifugal impellers inlet port 5 firstly goes through theaxial impeller 13, and then goes through thecentrifugal impeller 14A, as shown inFIG. 1 . - The
axial impeller 13 is composed of afirst cylinder 13 a having a first outer diameter slightly smaller than an inner diameter of the cylindrical can 12 and afirst groove 13 b spirally formed on a periphery of thefirst cylinder 13 a. - The
centrifugal impeller 14A is composed of asecond cylinder 14 a having a second outer diameter larger than the first outer diameter and asecond groove 14 b spirally and extendedly formed on a periphery of thesecond cylinder 14 a. Thesecond groove 14 b is smoothly connected with thefirst groove 13 b at a connection point A, as shown inFIG. 6 . Thus, the combinedimpeller 20 in this embodiment has two continuous grooves comprised of the first and second grooves. - Since the
second groove 14 b is spirally and extendedly formed on thesecond cylinder 14 b, abottom surface 14 c of thesecond groove 14 b has a termination edge on thesecond cylinder 14 a. At the termination edge, thebottom surface 14 c projects toward a rotational direction of the combinedimpeller 20 to form a forcingsurface 21. In more detail, thebottom surface 14 c is shaped such that a part of thebottom surface 14 c near the termination edge smoothly curves toward the rotational direction of the combinedimpeller 20. By such a construction of thesecond groove 14 b, liquid which is conveyed along thesecond groove 14 b as the combinedimpeller 20 rotates is finally forced to change its flow direction by the forcingsurface 21 along with substantially a tangential direction of thesecond cylinder 14 a. A projecting area G of the forcingsurface 21 may be formed to be 30% or less to the entire area F of thebottom surface 14 c from the connection point A to the termination edge as shown inFIG.7 . - An operation of the forcing
surface 21 will be described in more detail. Rotation of the combinedimpeller 20 causes conveyance of liquid from theinlet port 5 to theoutlet port 6 through the combinedimpeller 20, as shown inFIG. 1 . When forwarding the liquid from thecentrifugal impeller 14A of the combinedimpeller 20 to theoutlet port 6, the liquid is forwarded by thebottom surface 14 c toward the direction indicated by the arrow D and then is forced to flow by the forcingsurface 21 toward the tangential direction of thesecond cylinder 14 a indicated by an arrow E, i.e., the rotational direction of the combinedimpeller 20, as the rotation of the combinedimpeller 20 advances. The flow direction of the liquid is thus changed to the rotational direction of the combinedimpeller 20 by the forcingsurface 21 and the liquid is finally discharged from theoutlet port 6. - In general, pumps may draw liquid with air bubbles into the inside thereof or air bubbles may be produced during transfer of liquid within a pump. Such air bubbles may stay in the pump and adversely affect performance of the pump. However, in this embodiment, since the forcing
surface 21 forcibly and smoothly changes the flow direction of liquid from the axial direction to the rotational direction of the combinedimpeller 20, air bubbles are also forwarded together with the liquid to theoutlet port 6 and are finally discharged out of theport 6. Therefore, performance of the pump can be improved by the forcing surface. -
FIG. 8 is a graph showing pump performance of discharging air bubbles contained in liquid and degree of load affecting the combinedimpeller 20 respectively in terms of each ratio in an area of the forcingsurface 21 to an entire area of thebottom surface 14 c when the ratio is varied. As can be seen, the larger the area ratio goes, the higher the pump performance becomes. However the degree of the load adversely increases in accordance with the area ratio. Thus, it is preferred to set the area ratio to be 30% or less. - A third embodiment of the present invention is described with reference to
FIG. 9 . In the above-described first and second embodiments, the centrifugal impeller 14 (14A) includes thesecond cylinder 14 a on the outer surface of which thesecond groove 14 b having one wall and a bottom surface is formed. The third embodiment includes a further modified combinedimpeller 30. - General structure of a pump in this embodiment is like the pump described in the first embodiment. The further modified combined
impeller 30 is formed such that a circulartop plate 14 e is set on thesecond cylinder 14 a of the combinedimpeller 4 shown inFIG. 1 . The circulartop plate 14 e has a diameter equal to or slightly larger than the outer diameter of thesecond cylinder 14 a. - When manufacturing the combined
impeller 30, it is possible to fix the circulartop plate 14 e with thesecond cylinder 14 a or to integrally mold the combinedimpeller 30 including an axial andcentrifugal impellers top plate 14 e. - The above-described combined
impeller 30 is driven by the drivingunit 9 as similar to the first embodiment. When the combinedimpeller 30 rotates in the pump, liquid transferred from thefirst groove 13 b is forwarded toward a radial direction of the combinedimpeller 30 by thebottom surface 14 c. Then the circulartop plate 14 e functions to assist thecentrifugal impeller 14 to forcibly move the liquid, which otherwise flows in the axial direction, toward the radial direction thereof. Therefore, the circulartop plate 14 e of thecentrifugal impeller 14 can improve performance of the pump. - Numerous modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that, within the scope of the appended claims, the present invention can be practiced in a manner other than as specifically described therein.
Claims (8)
1. A pump for transporting liquid, comprising:
a housing having a cylindrical wall defining a liquid passage inside the housing, the housing having opposite sides;
an inlet port, formed at one side of the housing, which is fluidly communicated with the passage;
an outlet port, formed at the other side of the housing, which is fluidly communicated the passage; and
a combined impeller rotatably arranged along a center line of the cylindrical wall to forcibly generate flow of the liquid through the inlet port and discharge the liquid out of the outlet port, the combined impeller including an axial impeller and a centrifugal impeller which are located, in order, along the passage from the inlet port to the outlet port, the axial impeller being composed of a first cylinder having a first outer diameter and a first groove spirally formed on the first cylinder, and the centrifugal impeller being composed of a second cylinder having a second outer diameter larger than the first outer diameter and a second groove spirally formed on the second cylinder,
wherein the second groove is smoothly connected with the first groove through a connection point and the second groove is shaped such that a distance between a bottom surface of the second groove and a rotational center of the centrifugal impeller gradually increases from the connection point in a direction opposite to the rotational direction of the combined impeller.
2. A pump according to claim 1 , wherein the second groove has a bottom surface termination edge and includes a forcing surface, formed on the bottom surface termination edge, which projects toward the rotational direction of the combined impeller to push out the liquid along with substantially a tangential direction of the second cylinder.
3. A pump according to claim 2 , wherein the projecting area of the forcing surface is 30% or less to the entire area of the bottom surface of the second groove from the connection point to the bottom surface termination edge.
4. A pump according to claim 2 , wherein the bottom surface of the second groove is formed such that a width of the bottom surface in a direction along the center line of the cylindrical wall gradually decreases toward the bottom surface termination edge.
5. A pump according to claim 1 , wherein the second groove has a bottom surface termination edge and the bottom surface of the second groove is formed such that a width of the bottom surface in a direction along the center line of the cylindrical wall gradually decreases toward the bottom surface termination edge.
6. A pump according to claim 5 , further comprising a circular top plate having a diameter equal to or larger than the second diameter and provided on a surface having the bottom surface termination edge.
7. A pump according to claim 1 , further including a driving unit for supplying a driving current to drive the combined impeller and a stator having windings, the stator being opposite to the combined impeller through the cylindrical wall in the housing.
8. A pump according to claim 7 , wherein the combined impeller includes a plurality of magnets arranged at a distance along the rotational direction inside the combined impeller, and the combined impeller is rotated around the rotational center when the driving unit supplies a driving current to the windings of the stator.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004321469A JP2006132417A (en) | 2004-11-05 | 2004-11-05 | Pump |
JPJP2004-321469 | 2004-11-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060099068A1 true US20060099068A1 (en) | 2006-05-11 |
Family
ID=36316502
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/266,239 Abandoned US20060099068A1 (en) | 2004-11-05 | 2005-11-04 | Axial flow pump |
Country Status (2)
Country | Link |
---|---|
US (1) | US20060099068A1 (en) |
JP (1) | JP2006132417A (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102486169A (en) * | 2009-12-12 | 2012-06-06 | 赵明 | High-efficiency axial flow and screw combined pump for ship |
CN103410742A (en) * | 2013-08-15 | 2013-11-27 | 陈彦朗 | Compound pump |
CN103671007A (en) * | 2013-12-04 | 2014-03-26 | 黄山工业泵制造有限公司 | Displacement centrifugal pump |
US20180023594A1 (en) * | 2016-07-25 | 2018-01-25 | Dongguan Zhenpin Hardware Cooling Technology Co. L td | Water Pump Cooler for CPU |
US20180154056A1 (en) * | 2015-03-03 | 2018-06-07 | Drexel University | Dual-Pump Continuous-Flow Total Artificial Heart |
CN109253115A (en) * | 2018-10-24 | 2019-01-22 | 兰州理工大学 | A kind of helico-axial oil-gas mixed delivery pump of the suitable high void fraction of conveying |
CN110953160A (en) * | 2019-11-28 | 2020-04-03 | 江苏大学 | Impeller built-in high-speed centrifugal pump |
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---|---|---|---|---|
US2029766A (en) * | 1934-08-18 | 1936-02-04 | Chicago Pump Co | Screw feed centrifugal pump |
US2760437A (en) * | 1951-02-24 | 1956-08-28 | Thompson Prod Inc | Submerged booster pump |
US3221661A (en) * | 1961-12-18 | 1965-12-07 | Electronic Specialty Co | Low-suction head pumps |
US4540334A (en) * | 1982-12-22 | 1985-09-10 | Staehle Martin | Open-type centrifugal pump with single-blade impeller |
US4792282A (en) * | 1987-06-03 | 1988-12-20 | A. Janet Jordan | Liquid pump |
US5100295A (en) * | 1988-09-16 | 1992-03-31 | Nnc Limited | Impeller pumps |
US6109887A (en) * | 1997-03-05 | 2000-08-29 | Toshiba Tec Kabushiki Kaisha | Electric pump |
US6511298B2 (en) * | 2000-02-08 | 2003-01-28 | Toshiba Tec Kabushiki Kaisha | Electric motor pump with axial-flow impellers |
US6514053B2 (en) * | 2000-02-10 | 2003-02-04 | Toshiba Tec Kabushiki Kaisha | Motor-driven pump with a plurality of impellers |
US6554584B2 (en) * | 2000-01-31 | 2003-04-29 | Toshiba Tec Kabushiki Kaisha | Inline type pump |
US20040221879A1 (en) * | 2003-05-07 | 2004-11-11 | Toshiba Tec Kabushiki Kaisha | Motor-integrated pump and washing apparatus using the same |
US20050100451A1 (en) * | 2002-12-02 | 2005-05-12 | Toshiba Tec Kabushiki Kaisha | Axial flow pump and fluid circulating apparatus |
-
2004
- 2004-11-05 JP JP2004321469A patent/JP2006132417A/en active Pending
-
2005
- 2005-11-04 US US11/266,239 patent/US20060099068A1/en not_active Abandoned
Patent Citations (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2029766A (en) * | 1934-08-18 | 1936-02-04 | Chicago Pump Co | Screw feed centrifugal pump |
US2760437A (en) * | 1951-02-24 | 1956-08-28 | Thompson Prod Inc | Submerged booster pump |
US3221661A (en) * | 1961-12-18 | 1965-12-07 | Electronic Specialty Co | Low-suction head pumps |
US4540334A (en) * | 1982-12-22 | 1985-09-10 | Staehle Martin | Open-type centrifugal pump with single-blade impeller |
US4792282A (en) * | 1987-06-03 | 1988-12-20 | A. Janet Jordan | Liquid pump |
US5100295A (en) * | 1988-09-16 | 1992-03-31 | Nnc Limited | Impeller pumps |
US6109887A (en) * | 1997-03-05 | 2000-08-29 | Toshiba Tec Kabushiki Kaisha | Electric pump |
US6554584B2 (en) * | 2000-01-31 | 2003-04-29 | Toshiba Tec Kabushiki Kaisha | Inline type pump |
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US20040221879A1 (en) * | 2003-05-07 | 2004-11-11 | Toshiba Tec Kabushiki Kaisha | Motor-integrated pump and washing apparatus using the same |
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Legal Events
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Owner name: TOSHIBA TEC KABUSHIKI KAISHA, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TANABE, YOSHIFUMI;MANDA, TAKAHIKO;REEL/FRAME:017188/0618 Effective date: 20051019 |
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