US20040253127A1 - Refrigerant pump and cooling device employing same - Google Patents
Refrigerant pump and cooling device employing same Download PDFInfo
- Publication number
- US20040253127A1 US20040253127A1 US10/814,712 US81471204A US2004253127A1 US 20040253127 A1 US20040253127 A1 US 20040253127A1 US 81471204 A US81471204 A US 81471204A US 2004253127 A1 US2004253127 A1 US 2004253127A1
- Authority
- US
- United States
- Prior art keywords
- drive shaft
- pump
- refrigerant pump
- rotor
- refrigerant
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
- F04C29/0085—Prime movers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
Definitions
- the present invention relates to a cooling device for cooling, for example, a semiconductor element or elements or the like, which generate a substantial quantity of heat, by utilization of a change in phase between a liquid phase and a vapor phase of a refrigerant.
- the present invention also relates to an oilfree refrigerant pump employed in such a cooling device.
- FIG. 1 depicts a conventional refrigerant pump as disclosed in Japanese Laid-Open Patent Publication (examined) No. 7-47957.
- the refrigerant pump shown therein includes a pump mechanism 31 and an electric motor 32 for driving the pump mechanism 31 .
- the electric motor 32 includes a stator 33 and a rotor 34 rigidly secured to a drive shat 35 that drives the pump mechanism 31 .
- the stator 33 is positioned in alignment with the rotor 34 in the axial direction of the refrigerant pump.
- FIG. 2 depicts another conventional refrigerant pump as disclosed in Japanese Laid-Open Patent Publication (unexamined) No. 3-233188.
- the refrigerant pump shown therein includes a pump mechanism 41 and an electric motor 42 for driving the pump mechanism 41 , wherein a stator 43 is positioned in alignment with a rotor 44 in the axial direction of the refrigerant pump, as in the refrigerant pump of FIG. 1.
- the refrigerant pump of FIG. 2 also includes a relatively expensive bushing 45 disposed inside a bearing 46 for rotatably supporting a drive shaft 47 .
- Another objective of the present invention is to provide a high-performance cooling device employing the refrigerant pump referred to above.
- the refrigerant pump includes a sealed casing, an electric motor having a stator disposed outside the sealed casing and a rotor disposed within the sealed casing, a pump mechanism juxtaposed with the electric motor, and a drive shaft for transmitting a rotational force of the rotor to the pump mechanism, wherein the stator is positioned closer to the pump mechanism than the rotor is.
- This construction generates, during operation of the refrigerant pump, a thrust force that acts to push the drive shaft towards the pump mechanism so that the drive shaft may be stably held in contact at a surface thereof with a component part opposed thereto, making it possible to provide a quiet and reliable refrigerant pump. Furthermore, it is sufficient if grinding or polishing is carried out with respect to only the contact surface of the drive shaft with the component part opposed thereto, resulting in a relatively inexpensive refrigerant pump.
- the surface of the drive shaft is carburized or nitrided, making it possible to provide an oilfree refrigerant pump.
- a bearing for rotatably supporting the drive shaft may have a carburized or nitrided surface.
- the refrigerant pump is free from oil, a reduction in heat transfer performance that has been hitherto caused by oil entering a refrigerating cycle can be avoided, making it possible to provide a high-performance cooling device.
- FIG. 1 is a sectional view of a conventional refrigerant pump
- FIG. 2 is a sectional view of another conventional refrigerant pump
- FIG. 3 is a sectional view of a refrigerant pump according to the present invention.
- FIG. 4 is a refrigerating cycle of a semiconductor cooling device in which the refrigerant pump of FIG. 3 is employed.
- FIG. 3 a refrigerant pump embodying the present invention, which includes a sealed casing 1 , an electric motor having a stator 2 and a rotor 4 , and a pump mechanism 5 juxtaposed with the electric motor and disposed within and fixed to the sealed casing 2 .
- the stator 2 is disposed outside the sealed casing 1
- the rotor 4 is rigidly secured to a drive shaft 3 disposed within the sealed casing 1 .
- the drive shaft 3 has a large-diameter portion having opposite end surfaces 3 a , 3 b.
- the stator 2 is positioned closer to the pump mechanism than the rotor 4 is. More specifically, a central plane 2 a of the stator 2 in the axial direction thereof is positioned offset from a central plane 4 a of the rotor 4 in the axial direction thereof such that the former is positioned closer to the pump mechanism 5 than the latter by a distance L.
- the pump mechanism 5 includes a cylinder bearing 7 , a plurality of pump components 8 , and a suction plate 6 .
- the cylinder bearing 7 serves both as a bearing for rotatably supporting the drive shaft 3 and a cylinder defining a pump chamber.
- the surface of the drive shaft 3 is carburized or nitrided, while the inside of the refrigerant pump is free from oil.
- the surface of the cylinder bearing 7 may be carburized or nitrided in place of the drive shaft 3 , or both of them may be carburized or nitrided.
- FIG. 4 depicts a refrigerating cycle of a semiconductor cooling device in which an oilfree refrigerant pump referred to above is employed.
- the semiconductor cooling device shown in FIG. 4 includes a cold plate 21 for cooling a highly exothermic semiconductor element or elements that tend to emit a substantial amount of heat when in operation, a condenser 22 , and an oilfree refrigerant pump 23 , all connected in series with each other to define a refrigerating cycle.
- An outlet of the condenser 22 and an inlet of the cold plate 21 are connected with each other with the refrigerant pump 23 interposed therebetween, while an outlet of the cold plate 21 and an inlet of the condenser 22 are connected with each other.
- a refrigerant is filled in this refrigerating cycle.
- the condenser 22 is adapted to be cooled by a fan 24 .
- the cooling device is so designed that a liquid refrigerant emerging first from the condenser 22 is supplied towards the cold plate 21 by the oilfree refrigerant pump 23 .
- the cold plate 21 so supplied with the liquid refrigerant absorbs heat generated by the highly exothermic semiconductor element and, in the course of absorption of the heat, a change in phase from the liquid refrigerant to a vapor refrigerant takes place within the cold plate 21 .
- the vapor refrigerant is then supplied to the condenser 22 that is then cooled by the fan 24 so that the vapor refrigerant within the condenser 22 undergoes a phase change to a liquid refrigerant.
Abstract
A refrigerant pump employed in a semiconductor cooling device includes a sealed casing, an electric motor having a stator disposed outside the sealed casing and a rotor disposed within the sealed casing, a pump mechanism juxtaposed with the electric motor, and a drive shaft for transmitting a rotational force of the rotor to the pump mechanism. The stator is positioned closer to the pump mechanism than the rotor is.
Description
- 1. Field of the Invention
- The present invention relates to a cooling device for cooling, for example, a semiconductor element or elements or the like, which generate a substantial quantity of heat, by utilization of a change in phase between a liquid phase and a vapor phase of a refrigerant. The present invention also relates to an oilfree refrigerant pump employed in such a cooling device.
- 2. Description of the Related Art
- FIG. 1 depicts a conventional refrigerant pump as disclosed in Japanese Laid-Open Patent Publication (examined) No. 7-47957. The refrigerant pump shown therein includes a
pump mechanism 31 and anelectric motor 32 for driving thepump mechanism 31. Theelectric motor 32 includes astator 33 and arotor 34 rigidly secured to adrive shat 35 that drives thepump mechanism 31. Thestator 33 is positioned in alignment with therotor 34 in the axial direction of the refrigerant pump. - In the above-described conventional refrigerant pump, because the
stator 33 is positioned in alignment with therotor 34 in the axial direction of the refrigerant pump, which of opposite surfaces of an eccentric portion of thedrive shaft 35 receives a thrust force is not determined and, hence, grinding or polishing of both the opposite surfaces of the eccentric portion is required. Furthermore, because thedrive shaft 35 is not pushed in only one direction, it sometimes oscillates, giving rise to noises. - FIG. 2 depicts another conventional refrigerant pump as disclosed in Japanese Laid-Open Patent Publication (unexamined) No. 3-233188. The refrigerant pump shown therein includes a
pump mechanism 41 and anelectric motor 42 for driving thepump mechanism 41, wherein astator 43 is positioned in alignment with arotor 44 in the axial direction of the refrigerant pump, as in the refrigerant pump of FIG. 1. - The refrigerant pump of FIG. 2 also includes a relatively
expensive bushing 45 disposed inside abearing 46 for rotatably supporting adrive shaft 47. - In the refrigerant pump of FIG. 2, the use of the relatively
expensive bushing 45 inside the bearing 46 results in an increase in cost. In the case where a lubricating oil is used to lubricate thebearing 46, there is a good chance that the lubricating oil enters a cooling system employing a cold plate, and adhesion of the lubricating oil to the cold plate lowers the heat transfer performance. - The present invention has been developed to overcome the above-described disadvantages.
- It is accordingly an objective of the present invention to provide a reliable refrigerant pump that is low in noise level and can be manufactured at a low cost.
- Another objective of the present invention is to provide a high-performance cooling device employing the refrigerant pump referred to above.
- In accomplishing the above and other objectives, the refrigerant pump according to the present invention includes a sealed casing, an electric motor having a stator disposed outside the sealed casing and a rotor disposed within the sealed casing, a pump mechanism juxtaposed with the electric motor, and a drive shaft for transmitting a rotational force of the rotor to the pump mechanism, wherein the stator is positioned closer to the pump mechanism than the rotor is.
- This construction generates, during operation of the refrigerant pump, a thrust force that acts to push the drive shaft towards the pump mechanism so that the drive shaft may be stably held in contact at a surface thereof with a component part opposed thereto, making it possible to provide a quiet and reliable refrigerant pump. Furthermore, it is sufficient if grinding or polishing is carried out with respect to only the contact surface of the drive shaft with the component part opposed thereto, resulting in a relatively inexpensive refrigerant pump.
- Advantageously, the surface of the drive shaft is carburized or nitrided, making it possible to provide an oilfree refrigerant pump. A bearing for rotatably supporting the drive shaft may have a carburized or nitrided surface. In the case where the refrigerant pump is free from oil, a reduction in heat transfer performance that has been hitherto caused by oil entering a refrigerating cycle can be avoided, making it possible to provide a high-performance cooling device.
- The above and other objectives and features of the present invention will become more apparent from the following description of a preferred embodiment thereof with reference to the accompanying drawings, throughout which like parts are designated by like reference numerals, and wherein:
- FIG. 1 is a sectional view of a conventional refrigerant pump;
- FIG. 2 is a sectional view of another conventional refrigerant pump;
- FIG. 3 is a sectional view of a refrigerant pump according to the present invention; and
- FIG. 4 is a refrigerating cycle of a semiconductor cooling device in which the refrigerant pump of FIG. 3 is employed.
- This application is based on an application No. 2003-164986 filed Jun. 10, 2003 in Japan, the content of which is herein expressly incorporated by reference in its entirety.
- Referring now to the drawings, there is shown in FIG. 3 a refrigerant pump embodying the present invention, which includes a sealed
casing 1, an electric motor having astator 2 and arotor 4, and apump mechanism 5 juxtaposed with the electric motor and disposed within and fixed to the sealedcasing 2. Thestator 2 is disposed outside the sealedcasing 1, while therotor 4 is rigidly secured to adrive shaft 3 disposed within the sealedcasing 1. Thedrive shaft 3 has a large-diameter portion havingopposite end surfaces - As shown in FIG. 3, the
stator 2 is positioned closer to the pump mechanism than therotor 4 is. More specifically, acentral plane 2 a of thestator 2 in the axial direction thereof is positioned offset from acentral plane 4 a of therotor 4 in the axial direction thereof such that the former is positioned closer to thepump mechanism 5 than the latter by a distance L. - A rotational force of the
rotor 4 is transmitted to thepump mechanism 5 via thedrive shaft 3. Thepump mechanism 5 includes a cylinder bearing 7, a plurality ofpump components 8, and asuction plate 6. The cylinder bearing 7 serves both as a bearing for rotatably supporting thedrive shaft 3 and a cylinder defining a pump chamber. The surface of thedrive shaft 3 is carburized or nitrided, while the inside of the refrigerant pump is free from oil. The surface of the cylinder bearing 7 may be carburized or nitrided in place of thedrive shaft 3, or both of them may be carburized or nitrided. - FIG. 4 depicts a refrigerating cycle of a semiconductor cooling device in which an oilfree refrigerant pump referred to above is employed. The semiconductor cooling device shown in FIG. 4 includes a
cold plate 21 for cooling a highly exothermic semiconductor element or elements that tend to emit a substantial amount of heat when in operation, acondenser 22, and anoilfree refrigerant pump 23, all connected in series with each other to define a refrigerating cycle. An outlet of thecondenser 22 and an inlet of thecold plate 21 are connected with each other with therefrigerant pump 23 interposed therebetween, while an outlet of thecold plate 21 and an inlet of thecondenser 22 are connected with each other. - A refrigerant is filled in this refrigerating cycle. The
condenser 22 is adapted to be cooled by afan 24. - The cooling device is so designed that a liquid refrigerant emerging first from the
condenser 22 is supplied towards thecold plate 21 by theoilfree refrigerant pump 23. Thecold plate 21 so supplied with the liquid refrigerant absorbs heat generated by the highly exothermic semiconductor element and, in the course of absorption of the heat, a change in phase from the liquid refrigerant to a vapor refrigerant takes place within thecold plate 21. The vapor refrigerant is then supplied to thecondenser 22 that is then cooled by thefan 24 so that the vapor refrigerant within thecondenser 22 undergoes a phase change to a liquid refrigerant. - According to the above-described construction, because the axial
central plane 2 a of thestator 2 is positioned closer to thepump mechanism 5 than the axialcentral plane 4 a of therotor 4, when the electric motor is energized, a thrust force as indicated by an arrow A that acts to push therotor 4 towards thepump mechanism 5 is created, as show in FIG. 3. This thrust force also acts to push towards thesuction plate 6 thedrive shaft 3 to which therotor 4 is rigidly secured so that theend surface 3 a of the large-diameter portion of thedrive shaft 3 may be stably held in contact with thesuction plate 6. On the other hand, theend surface 3 b of the large-diameter portion of thedrive shaft 3 remote from thesuction plate 6 is brought into contact with the cylinder bearing 7 under a considerably small pressure or is not brought into contact therewith. - Accordingly, grinding or polishing is required with respect to only the
end surface 3 a of the large-diameter portion of thedrive shaft 3. That is, theend surface 3 a remote from the electric motor has a higher precision than theend surface 3 b, resulting in an inexpensive drive shaft. Furthermore, noises that have been hitherto caused by oscillation of thedrive shaft 3 are reduced. - In addition, because the surface of the
drive shaft 3 is carburized or nitrided, and the inside of the refrigerant pump is free from oil, a reduction in the heat transfer coefficient between the refrigerant and an object to be cooled (the cold plate in this case) that has been hitherto caused by oil contamination of the refrigerating cycle can be reduced, making it possible to prevent the cooling power from reducing. - Although the present invention has been fully described by way of examples with reference to the accompanying drawings, it is to be noted here that various changes and modifications will be apparent to those skilled in the art. Therefore, unless such changes and modifications otherwise depart from the spirit and scope of the present invention, they should be construed as being included therein.
Claims (5)
1. A refrigerant pump comprising:
a sealed casing;
an electric motor having a stator disposed outside the sealed casing and a rotor disposed within the sealed casing;
a pump mechanism juxtaposed with the electric motor; and
a drive shaft for transmitting a rotational force of the rotor to the pump mechanism,
wherein the stator is positioned closer to the pump mechanism than the rotor is.
2. The refrigerant pump according to claim 1 , wherein the drive shaft has a large-diameter portion having first and second end surfaces opposite to each other, the first end surface positioned remote from the electric motor having a higher precision than the second end surface.
3. The refrigerant pump according to claim 2 , wherein a surface of the drive shaft is carburized or nitrided.
4. A refrigerant pump comprising:
a sealed casing;
an electric motor having a stator disposed outside the sealed casing and a rotor disposed within the sealed casing;
a pump mechanism juxtaposed with the electric motor;
a drive shaft for transmitting a rotational force of the rotor to the pump mechanism; and
a bearing for rotatably supporting the drive shaft,
wherein at least one of the drive shaft ant the bearing has a carburized or nitrided surface.
5. A refrigerant-circulating cooling device comprising a refrigerant pump according to any one of claims 1 to 4 , wherein the refrigerant pump is free from oil.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003164986A JP4168844B2 (en) | 2003-06-10 | 2003-06-10 | Refrigerant pump and cooling device |
JP2003-164986 | 2003-06-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040253127A1 true US20040253127A1 (en) | 2004-12-16 |
Family
ID=33508828
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/814,712 Abandoned US20040253127A1 (en) | 2003-06-10 | 2004-03-31 | Refrigerant pump and cooling device employing same |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040253127A1 (en) |
JP (1) | JP4168844B2 (en) |
CN (1) | CN1573117A (en) |
TW (1) | TW200506204A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7800262B1 (en) * | 2009-05-05 | 2010-09-21 | John Leo Larson | Centrifugal drop fan and valve with sliding motor |
US8513839B1 (en) * | 2009-05-05 | 2013-08-20 | John L Larson | Fan with damper |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101315080B (en) * | 2008-05-13 | 2011-09-07 | 深圳市雅尔典科技有限公司 | Full sealing type refrigerant fluid pump and its application in high-rise storied house refrigerating system |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5490730A (en) * | 1993-10-22 | 1996-02-13 | Hitachi Construction Machinery Co., Ltd. | Slide bearing assembly |
US6371739B1 (en) * | 1999-01-22 | 2002-04-16 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for applying pre-load to the bearing structure of a drive shaft that is directly driven by an electric motor |
US6510457B1 (en) * | 1998-06-17 | 2003-01-21 | Hitachi, Ltd. | Data analysis method and apparatus for data mining |
US20030212789A1 (en) * | 2002-05-09 | 2003-11-13 | International Business Machines Corporation | Method, system, and program product for sequential coordination of external database application events with asynchronous internal database events |
US20040122790A1 (en) * | 2002-12-18 | 2004-06-24 | Walker Matthew J. | Computer-assisted data processing system and method incorporating automated learning |
US20040128204A1 (en) * | 2002-12-27 | 2004-07-01 | Cihla Virgil F. | Systems for procuring products in a distributed system |
US20040164961A1 (en) * | 2003-02-21 | 2004-08-26 | Debasis Bal | Method, system and computer product for continuously monitoring data sources for an event of interest |
US20040215522A1 (en) * | 2001-12-26 | 2004-10-28 | Eder Jeff Scott | Process optimization system |
US7040875B2 (en) * | 2002-04-24 | 2006-05-09 | Matsushita Electric Industrial Co., Ltd. | Refrigerant pump with rotors in bearing |
-
2003
- 2003-06-10 JP JP2003164986A patent/JP4168844B2/en not_active Expired - Fee Related
-
2004
- 2004-03-31 TW TW093108867A patent/TW200506204A/en unknown
- 2004-03-31 US US10/814,712 patent/US20040253127A1/en not_active Abandoned
- 2004-04-06 CN CN200410033559.0A patent/CN1573117A/en active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5490730A (en) * | 1993-10-22 | 1996-02-13 | Hitachi Construction Machinery Co., Ltd. | Slide bearing assembly |
US6510457B1 (en) * | 1998-06-17 | 2003-01-21 | Hitachi, Ltd. | Data analysis method and apparatus for data mining |
US6371739B1 (en) * | 1999-01-22 | 2002-04-16 | Matsushita Electric Industrial Co., Ltd. | Method and apparatus for applying pre-load to the bearing structure of a drive shaft that is directly driven by an electric motor |
US20040215522A1 (en) * | 2001-12-26 | 2004-10-28 | Eder Jeff Scott | Process optimization system |
US7040875B2 (en) * | 2002-04-24 | 2006-05-09 | Matsushita Electric Industrial Co., Ltd. | Refrigerant pump with rotors in bearing |
US20030212789A1 (en) * | 2002-05-09 | 2003-11-13 | International Business Machines Corporation | Method, system, and program product for sequential coordination of external database application events with asynchronous internal database events |
US20040122790A1 (en) * | 2002-12-18 | 2004-06-24 | Walker Matthew J. | Computer-assisted data processing system and method incorporating automated learning |
US20040128204A1 (en) * | 2002-12-27 | 2004-07-01 | Cihla Virgil F. | Systems for procuring products in a distributed system |
US20040164961A1 (en) * | 2003-02-21 | 2004-08-26 | Debasis Bal | Method, system and computer product for continuously monitoring data sources for an event of interest |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7800262B1 (en) * | 2009-05-05 | 2010-09-21 | John Leo Larson | Centrifugal drop fan and valve with sliding motor |
US8513839B1 (en) * | 2009-05-05 | 2013-08-20 | John L Larson | Fan with damper |
Also Published As
Publication number | Publication date |
---|---|
CN1573117A (en) | 2005-02-02 |
TW200506204A (en) | 2005-02-16 |
JP2005002827A (en) | 2005-01-06 |
JP4168844B2 (en) | 2008-10-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:NAKANO, MASAO;IKEDA, AKIRA;ASHITANI, HIROMASA;REEL/FRAME:015179/0756 Effective date: 20040224 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |