WO1993005515A1 - Cooling system for acoustic devices - Google Patents

Cooling system for acoustic devices Download PDF

Info

Publication number
WO1993005515A1
WO1993005515A1 PCT/SE1992/000589 SE9200589W WO9305515A1 WO 1993005515 A1 WO1993005515 A1 WO 1993005515A1 SE 9200589 W SE9200589 W SE 9200589W WO 9305515 A1 WO9305515 A1 WO 9305515A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
coolant
cooling
cooling system
fixture
Prior art date
Application number
PCT/SE1992/000589
Other languages
French (fr)
Inventor
Göran Engdahl
Gunnar Molund
Dag Wikström
Original Assignee
Abb Atom Ab
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Abb Atom Ab filed Critical Abb Atom Ab
Publication of WO1993005515A1 publication Critical patent/WO1993005515A1/en

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Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
    • G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
    • G10K9/121—Flextensional transducers

Definitions

  • a cooling system according to the invention included in the acoustic device, is therefore designed to give the device in question, which is immersed into water, the cooling which is needed for continuous operation, also outside the resonance range of the device. Otherwise, the cooling system is adapted for use in connection with the "Drive system for acoustic devices" which is the subject of the patent application with application number 9102474-5, filed concurrently herewith.
  • Figure 1 shows a drive device included in the drive system.
  • Figure 2 shows the composition of the cooling system.
  • Figure 3 shows a fixture tube with cooling channels.
  • Figure 4 shows a parallelepiped and how the coolant is passed to and from the cooling channels of the fixture tube.
  • Figure 5 shows an edge ring with slots provided for the coolant.
  • Figure 1 comprises a drive device consisting of a number of stacked stator cells, each of which comprises a magnetizing coil 1 which is fixed to a softmagnetic tube 2 which, in turn, is surrounded by and fixed to a fixture tube 3.
  • the stacking and the centering are controlled by a number of guide rings 4 and 5 which are preferably made of copper, which provides a certain lubricating effect during operation while at the same time its good thermal conductivity makes possible a good heat transport out to the stator rings.
  • Stacked inside each one of the stator cells are drive cells consisting of a cylindrical magnetic pellet 6 of magnetostrictive material, discs 7 and 8 of soft-magnetic material and discs 9 and 10 of permanent-magnetic material making contact with the end surfaces of the magnetic pellet 6.
  • Edge rings 12 and 13 are connected to the outer driving elements of the drive unit, and the outwardly- facing surface of the edge rings may be shaped as a frustum of a cone.
  • the output of force and movement of the drive unit is performed at the two driving rods 14 and 15 making contact with the pressure beams 16a and 16b of the acoustic device, the beams acting directly against an external shell (not shown) shaped as a cylindrical tube with a near elliptical cross section.
  • the stacked stator cells are fixed to an outer fixture frame 17. At the centre of the stack a mechanical prestress device for the drive cells is inserted.
  • the edge rings, on the stator cells connected to the prestress device have been replaced by parallelepipeds 18 and 19.
  • the pressure studs 20 and 21 facing the prestress device have also been adapted, relative to the drive studs 14 and 15, for their purpose.
  • a preferred embodiment of the drive system which, according to the invention, the cooling system is intended to cool and maintain within the scope of the allowed temperature range, comprises four parallel acting drive devices according to Figure 1.
  • Figure 2 shows in broad outline the design of the preferred embodiment of the cooling system according to the invention for an acoustic device.
  • the figure includes only the most essential parts of the drive system, as, for example, the stator cells 26, stacked on one ' side each of the prestress device, the parallelepipeds 18 and 19, the two pressure beams 16a and 16b as well as a first end plate 30 and a second end plate 31, 32, which are needed to show the design of the cooling system.
  • the cooling system according to the invention is a closed system which includes a cooling pump 33 for driving the coolant through the drive units. Cooling of the coolant takes place in the second end plate which, for this purpose, has been designed as a cooling box of a heat conducting material.
  • the cooling box comprises two plates 31 and 32, making contact with each other, with cooling channels and provided with illed-out flanges intended for good heat transfer between the coolant and the coolant surrounding the acoustic device.
  • the cooling box is otherwise formed such that the coolant in the cooling channels flows between and along the flanges and that the inlet and the outlet are provided centrally such that the flows passes in a closed loop along the sides of the end plates.
  • the coolant is passed via a first tube 34 to the cooling box. To seal and secure the tube, it is also attached to the opposite first end plate 30. After having passed through the cooling box, the coolant is passed out from this box in a second tube 35 and also this tube is attached to the opposite first end plate 30 to be sealed and secured. Discharge of the coolant to the drive units is performed by means of hose connections between outlets from the second tube and the parallelepipeds 18 and 19 of the drive units. The coolant is now branched off between the cooling channels in all the drive units, and after having passed through these channels the coolant will be returned to the cooling pump by means of hose connections between the parallelepipeds and the inlets on a third tube 36.
  • the inlets to the third tube are provided with throttle means to give the coolant within the drive units a well-defined pressure drop.
  • This third tube is sealed and secured to both the end plate 30 and the cooling box 31, 32.
  • any of the connections of the tube to the first end plate 30 there is a device 37 for for deaeration of the cooling system.
  • a device 37 for for deaeration of the cooling system.
  • volume compensators 38 for compensation and absorption of volume changes of the coolant.
  • FIG. 3 shows the above-mentioned fixture tube 3.
  • cooling channels are provided which, in a preferred embodiment, comprise six channels for each of the two identical main flow paths. All the channels extend in parallel with the symmetry axis of the stack.
  • the two main flow paths are symmetrically distributed in such a way that each one of them cools one half of the fixture tube.
  • each one of the main flow paths comprises three associated channels 39, 40 and 41 which pass the coolant into the fixture tube and three associated channels 42, 43 and 44 which pass the coolant back.
  • the fixture tube comprises four groups of cooling channels, two of these groups each comprising three cooling channels which pass the coolant into the fixture tube and the two other groups each comprising three cooling channels which pass the coolant back.
  • the stator cells are stacked as described above and sealing between the fixture tubes is brought about by two O- rings 45 and 46.
  • the parallelepiped 18 and its function in the cooling system is shown in Figure 4.
  • the coolant is passed to the stacked stator cells via the coolant inlets 47 and 48 of the parallelepipeds from the second tube 35 in Figure 2.
  • the return flow from the drive units passes the parallelepipeds and emerges at the outlets 49 and 50 and is then passed to the third tube 36 in Figure 2 via throttle means at the inlet openings of the third tube ' .
  • the parallelepipeds are provided with milled-out grooves 51, 52, 53 and 54.
  • edge rings facing the pressure beams are provided with milled-out grooves allowing this passage.
  • Figure 5 shows the edge rings with these grooves 55 and 56.
  • the number of cooling channels in the stator rings may vary in number and size
  • the coolant may, after having passed the cooling box, be passed to the cooling channels of the stator rings in a different and more direct way
  • the seals between the stator rings and between stator ring and edge ring and parallelepiped may be of a different design, etc.

Abstract

A cooling system for acoustic devices comprising a coolant pump (33), the outlet of which opens out into a first tube (34) which conducts a coolant to an end plate, designed as a cooling box (31, 32), in the acoustic device, the coolant from the cooling box being passed via a second tube (35) and hose connections to the drive system of the acoustic device, from where it is passed back via hose connections to a third tube (36), the outlet of which is connected to the inlet of the cooling pump.

Description

Cooling system for acoustic devices
For acoustic devices with a high power, the efficiency outside resonance is normally below 50 % . This means that continuous operation of such devices requires some form of cooling. The cooling which is achieved by these acoustic devices normally operating immersed into water is generally far from sufficient.' A cooling system according to the invention, included in the acoustic device, is therefore designed to give the device in question, which is immersed into water, the cooling which is needed for continuous operation, also outside the resonance range of the device. Otherwise, the cooling system is adapted for use in connection with the "Drive system for acoustic devices" which is the subject of the patent application with application number 9102474-5, filed concurrently herewith.
To explain the composition of the cooling system, therefore, a short and summary description will first be given as to how the current drive system is designed and in that connection reference will be made, in proper order, to the accompanying figures .
Figure 1 shows a drive device included in the drive system.
Figure 2 shows the composition of the cooling system.
Figure 3 shows a fixture tube with cooling channels.
Figure 4 shows a parallelepiped and how the coolant is passed to and from the cooling channels of the fixture tube.
Figure 5 shows an edge ring with slots provided for the coolant.
Figure 1 comprises a drive device consisting of a number of stacked stator cells, each of which comprises a magnetizing coil 1 which is fixed to a softmagnetic tube 2 which, in turn, is surrounded by and fixed to a fixture tube 3. The stacking and the centering are controlled by a number of guide rings 4 and 5 which are preferably made of copper, which provides a certain lubricating effect during operation while at the same time its good thermal conductivity makes possible a good heat transport out to the stator rings. Stacked inside each one of the stator cells are drive cells consisting of a cylindrical magnetic pellet 6 of magnetostrictive material, discs 7 and 8 of soft-magnetic material and discs 9 and 10 of permanent-magnetic material making contact with the end surfaces of the magnetic pellet 6. The pellets are guided radially on one of the discs with a holed disc 11. Edge rings 12 and 13 are connected to the outer driving elements of the drive unit, and the outwardly- facing surface of the edge rings may be shaped as a frustum of a cone.
The output of force and movement of the drive unit is performed at the two driving rods 14 and 15 making contact with the pressure beams 16a and 16b of the acoustic device, the beams acting directly against an external shell (not shown) shaped as a cylindrical tube with a near elliptical cross section.
The stacked stator cells are fixed to an outer fixture frame 17. At the centre of the stack a mechanical prestress device for the drive cells is inserted. For adaptation to the prestress device, the edge rings, on the stator cells connected to the prestress device, have been replaced by parallelepipeds 18 and 19. The pressure studs 20 and 21 facing the prestress device have also been adapted, relative to the drive studs 14 and 15, for their purpose.
Recesses for two lugs 22 and 23 with confronting plane surfaces, making an angle equal to the wedge angle of a prestress wedge 24 located between the lugs, have been provided in the parallelepipeds. A hole for a prestress screw 25 is threaded in the wedge 24. A preferred embodiment of the drive system which, according to the invention, the cooling system is intended to cool and maintain within the scope of the allowed temperature range, comprises four parallel acting drive devices according to Figure 1.
Figure 2 shows in broad outline the design of the preferred embodiment of the cooling system according to the invention for an acoustic device. The figure includes only the most essential parts of the drive system, as, for example, the stator cells 26, stacked on one' side each of the prestress device, the parallelepipeds 18 and 19, the two pressure beams 16a and 16b as well as a first end plate 30 and a second end plate 31, 32, which are needed to show the design of the cooling system.
The cooling system according to the invention is a closed system which includes a cooling pump 33 for driving the coolant through the drive units. Cooling of the coolant takes place in the second end plate which, for this purpose, has been designed as a cooling box of a heat conducting material. The cooling box comprises two plates 31 and 32, making contact with each other, with cooling channels and provided with illed-out flanges intended for good heat transfer between the coolant and the coolant surrounding the acoustic device. The cooling box is otherwise formed such that the coolant in the cooling channels flows between and along the flanges and that the inlet and the outlet are provided centrally such that the flows passes in a closed loop along the sides of the end plates.
From the cooling pump the coolant is passed via a first tube 34 to the cooling box. To seal and secure the tube, it is also attached to the opposite first end plate 30. After having passed through the cooling box, the coolant is passed out from this box in a second tube 35 and also this tube is attached to the opposite first end plate 30 to be sealed and secured. Discharge of the coolant to the drive units is performed by means of hose connections between outlets from the second tube and the parallelepipeds 18 and 19 of the drive units. The coolant is now branched off between the cooling channels in all the drive units, and after having passed through these channels the coolant will be returned to the cooling pump by means of hose connections between the parallelepipeds and the inlets on a third tube 36. The inlets to the third tube are provided with throttle means to give the coolant within the drive units a well-defined pressure drop. This third tube is sealed and secured to both the end plate 30 and the cooling box 31, 32. As is also clear from the figure, there are two identical and parallel main flow paths in each stack. As will be shown in Figures 3, 4 and 5, also these main paths are each divided into several channels.
In any of the connections of the tube to the first end plate 30 there is a device 37 for for deaeration of the cooling system. To the first tube there are connected a number of volume compensators 38 for compensation and absorption of volume changes of the coolant.
Figure 3 shows the above-mentioned fixture tube 3. In this, cooling channels are provided which, in a preferred embodiment, comprise six channels for each of the two identical main flow paths. All the channels extend in parallel with the symmetry axis of the stack. The two main flow paths are symmetrically distributed in such a way that each one of them cools one half of the fixture tube. In this embodiment, each one of the main flow paths comprises three associated channels 39, 40 and 41 which pass the coolant into the fixture tube and three associated channels 42, 43 and 44 which pass the coolant back. In this way, the fixture tube comprises four groups of cooling channels, two of these groups each comprising three cooling channels which pass the coolant into the fixture tube and the two other groups each comprising three cooling channels which pass the coolant back. The stator cells are stacked as described above and sealing between the fixture tubes is brought about by two O- rings 45 and 46.
The parallelepiped 18 and its function in the cooling system is shown in Figure 4. As is shown, the coolant is passed to the stacked stator cells via the coolant inlets 47 and 48 of the parallelepipeds from the second tube 35 in Figure 2. The return flow from the drive units passes the parallelepipeds and emerges at the outlets 49 and 50 and is then passed to the third tube 36 in Figure 2 via throttle means at the inlet openings of the third tube'. To be able to cover each one of the above-mentioned four groups, comprising three cooling channels each in each fixture tube, the parallelepipeds are provided with milled-out grooves 51, 52, 53 and 54.
To make it possible for the coolant to pass the stacks in both directions, the edge rings facing the pressure beams are provided with milled-out grooves allowing this passage. Figure 5 shows the edge rings with these grooves 55 and 56.
A number of different design solutions, similar to the ones described above and being within the scope of the cooling system according to the invention, are available. Thus, for example, the number of cooling channels in the stator rings may vary in number and size, the coolant may, after having passed the cooling box, be passed to the cooling channels of the stator rings in a different and more direct way, the seals between the stator rings and between stator ring and edge ring and parallelepiped may be of a different design, etc.

Claims

1. A cooling system for acoustic devices which externally comprises a shell shaped as a cylindrical tube with a near elliptical cross section and a first (30) and a second end plate (31, 32) and the drive system of which comprises at least one drive device composed of at least one drive unit and a mechanical prestress device (22,23,24,25), said drive unit comprising at least one stator cell with a fixture tube (3) , the drive unit at one axial end being provided with an edge ring (12) and at the other axial end with a parallelepiped (18) , which cooling system is characterized in that it is a closed cooling system with a coolant pump (33) , the outlet of which opening out into a first tube (34) which conducts a coolant to the second end plate which is arranged as a cooling box with cooling channels and flanges for cooling and which consists of two plates (31,32) of a thermally conducting material making contact with each other, that the coolant from the cooling box is passed via a second tube (35) and hose connections to the parallelepiped of each drive unit, that the parallelepiped is provided with milled-out slots (51,52,53,54) to pass the coolant on to cooling channels (39,40,41) provided in the fixture tube and further to the edge ring (12) which is provided with milled- out slots (55,56) such that the coolant may be passed via the cooling channels (42,43,44) of the fixture tubes back to the parallelepiped, from where the coolant is passed via hose connections to the inlets of a third tube (36), the outlet of which is connected to the inlet of the cooling pump.
2. A cooling system for acoustic devices according to claim 1, characterized in that the first (34) and second (35) tubes at one end are sealed and secured to the first end plate (30) and and at the other end openly secured to the second end plate (31,32) and that the third (36) tube at one end is sealed and secured to the first end plate and at the other end sealed and secured to the second end plate.
3. A cooling system for acoustic devices according to claim 1, characterized in that one or more of the tubes (34,35,36) are provided with a device (37) for deaeration of the cooling system and that the first tube (34) is provided with a volume compensator (38) to compensate for volume changes in the coolant.
4. A cooling system for acoustic devices according to claim 1, characterized in that between the fixture tubes (3) , between the fixture tubes and the edge ring (12) and between the fixture tubes and the parallelepiped (18) there are arranged double 0-rings (45,46) for sealing the cooling system.
5. A cooling system for acoustic devices according to claim 1, characterized in that the inlets for the coolant to the third tube are provided with throttle means.
PCT/SE1992/000589 1991-08-29 1992-08-26 Cooling system for acoustic devices WO1993005515A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9102473A SE468964B (en) 1991-08-29 1991-08-29 END OF COOLING SYSTEM FOR ACOUSTIC APPLIANCES
SE9102473-7 1991-08-29

Publications (1)

Publication Number Publication Date
WO1993005515A1 true WO1993005515A1 (en) 1993-03-18

Family

ID=20383564

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1992/000589 WO1993005515A1 (en) 1991-08-29 1992-08-26 Cooling system for acoustic devices

Country Status (3)

Country Link
CN (1) CN1069845A (en)
SE (1) SE468964B (en)
WO (1) WO1993005515A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066808A2 (en) * 1981-05-28 1982-12-15 Kabushiki Kaisha Toshiba Water-cooled high voltage device
EP0196863A1 (en) * 1985-03-28 1986-10-08 Fujitsu Limited Cooling system for electronic circuit components
EP0361196A1 (en) * 1988-09-29 1990-04-04 Siemens Nixdorf Informationssysteme Aktiengesellschaft Cooling liquid distribution system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066808A2 (en) * 1981-05-28 1982-12-15 Kabushiki Kaisha Toshiba Water-cooled high voltage device
EP0196863A1 (en) * 1985-03-28 1986-10-08 Fujitsu Limited Cooling system for electronic circuit components
EP0361196A1 (en) * 1988-09-29 1990-04-04 Siemens Nixdorf Informationssysteme Aktiengesellschaft Cooling liquid distribution system

Also Published As

Publication number Publication date
CN1069845A (en) 1993-03-10
SE9102473D0 (en) 1991-08-29
SE9102473L (en) 1993-03-01
SE468964B (en) 1993-04-19

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