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US3218825A - Refrigerating apparatus including means for cooling compressor motor - Google Patents

Refrigerating apparatus including means for cooling compressor motor Download PDF

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US3218825A
US3218825A US216842A US21684262A US3218825A US 3218825 A US3218825 A US 3218825A US 216842 A US216842 A US 216842A US 21684262 A US21684262 A US 21684262A US 3218825 A US3218825 A US 3218825A
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casing
refrigerant
condenser
stator
liquid
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US216842A
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Arthur W Mcclure
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Trane Co
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Trane Co
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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
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/04—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type
    • F25B1/053—Compression machines, plants or systems with non-reversible cycle with compressor of rotary type of turbine type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B31/00—Compressor arrangements
    • F25B31/006—Cooling of compressor or motor
    • F25B31/008—Cooling of compressor or motor by injecting a liquid

Definitions

  • This invention relates to refrigerating apparatus of the type including a motor-compressor assembly, and particularly to apparatus in which the motor and compressor are housed in a sealed unit.
  • FIGURE 1 is a partly diagrammatic view in elevation of the refrigerating apparatus with portions sectioned to more clearly show the interior construction;
  • FIGURE 2 is a cross-sectional view taken on line 2-2 of FIGURE l;
  • FIGURE 3 is an enlarged sectional view taken on an axial plane through one of the stator supporting bars and showing a portion of the interior of the motor;
  • FIGURE 4 is a partly diagrammatic view in elevation of a modification of the refrigerating apparatus with portions sectioned to more clearly show the interior construction.
  • an electric motor has at one end a first stage compressor 12 and at the other end a second stage compressor 14.
  • a cross-over pipe 16 conducts gas from the discharge of the first stage 12 to the inlet of the second stage 14.
  • the gas discharged from the second stage 14 flows through a pipe 18 to a condenser 20.
  • the condenser 20 may be of the shell-and-tube type in which cooling water flows through the tubing 22 and the refrigerant is in the shell outside the tubes.
  • Refrigerant liquid condensed in condenser 20 flows by gravity through pipe 23 to a reservoir 24.
  • a conduit 25 is in fluid flow communication with the bottom of reservoir 24 and conducts liquid refrigerant to the motor 10.
  • a conduit 26 is connected to the reservoir 24 at a point above its bottom to conduct overflow liquid refrigerant when the liquid rises to level 27.
  • a properly sized oat valve 28 maintains a liquid Ievel in the chamber of the valve.
  • Conduit 29 conducts the liquid and flash gas to evaporator 30 which is also of the shell-and-tube type in which the secondary refrigerant liquid such as water or brine flows through the tubing 31 and the refrigerant is in the shell outside the tubing.
  • the secondary refrigerant liquid circulates between the evaporator 30 and the cooling load served by the refrigeration apparatus to transfer heat from the load to the evaporator 30.
  • the refrigerant in the evaporator 30 ⁇ boils forming vapor which passes through the liquid eliminator 3,218,825 Patented Nov. 23, 1965 ICC 32 and thence into the suction pipe 34 of the evaporator 30 to the inlet of the first stage compressor 12.
  • the motor 10 has a fluid tight casing 36 secured in fluid sealing relationship to the housings of compressors 12 and 14. Bars 37 are secured to the casing 36 and to a motor stator 38 to support the motor stator 38 in the casing 36.
  • the stator 38 comprises large diameter laminations 43 and smaller diameter laminations 44 thus providing annular spaces 45 between the stator 38 and the casing 36 for the flow of refrigerant.
  • the refrigerant flowing in annular spaces 45 contacts and cools large surface areas of the stator 38, the bars 37, and the casing 36.
  • Rings 40 and 41 are secured to the casing 36 to provide additional support for the stator 38 and bars 37, and to seal the annular spaces 45 from the interior of the motor.
  • a manifold 46 collects the vaporized refrigerant for flow into conduit 47 and thence to condensor 20.
  • a shaft 48 is rotatably supported in the casing 36 by bearings (not shown) and extends at one end into compressor 12 and has a centrifugal impeller 52 secured thereto. The other end of shaft 48 extends into cornpressor 14 and has a centrifugal impeller 54 secured thereto.
  • a motor rotor 56 is secured to the shaft 48 and has fan blades 58 for circulating the refrigerant vapor over the surfaces of the shaft 48, the rotor 56, the stator 38, and the ends of the stator windings 59. This circulation of refrigerant vapor transfers heat from these parts to the cooled parts of the motor.
  • the spaces surrounding the rotor 56 and the spaces surrounding the end turns of the windings 59 are filled with refrigerant vapor because of the pressures and temperatures existing in these spaces.
  • the stator 38 With the liquid refrigerant at level 27 in the reservoir 24, the stator 38 is substantially submerged in liquid, because the liquid level in the annular passageways 45 is also substantially at level 27. With this arrangement, substantially all of the outer surfare area of laminations 43 and 44 and substantially all of the surface areas of laminations 43 defining annular spaces 45 are wetted with liquid refrigerant. Very effective cooling of the stator is therefore obtained.
  • FIGURE 4 which shows a modification of the apparatus of FIGURE l and in which corresponding parts have like numerals
  • the refrigerant liquid flows from condenser 20 through conduit 60 to a float valve 62 which maintains a liquid level in the chamber of the valve.
  • Conduit 64 conducts liquid refrigerant to the motor casing 36.
  • a valve 66 is positioned in the conduit 64 to control the flow therethrough.
  • a conduit 68 conducts vaporized refrigerant from the manifold 46 of the motor casing 36 to the evaporator 30 at a point below the eliminator 32.
  • a conduit 70 receives refrigerant liquid which overflows from conduit 64 and conducts such refrigerant liquid to evaporator 30.
  • FIGURE 4 The operation of the apparatus of FIGURE 4 is similar to that of FIGURE 1 in that on initiating operation the refrigerant liquid first produced by the condenser 20 flows directly through conduit 64 to the motor casing 36 for motor cooling.
  • Refrigerant liquid does not flow through conduit 70 until liquid in conduit 64 rises to the outlet to conduit 70.
  • the liquid refrigerant in the casing 36 is substantially at the same level as the liquid refrigerant in conduit 70 and the desired effective motor cooling is obtained as explained more fully with reference to FIGURE l.
  • an evaporator for vaporizing refrigerant a condenser for liquefying refrigerant
  • a compressor for circulating refrigerant through said condenser and evaporator
  • a casing an electric motor stator mounted in said casing and having grooves in its periphery, means providing an annular space between said electric motor stator and said casing, means for conducting refrigerant liquid from said condenser to the annular space between said electric r ROBERT A.
  • an evaporator for vaporizing refrigerant a condenser for liquefying refrigerant, a compressor for circulating refrigerant through said condenser and evaporator, a casing, an electric motor stator mounted in said casing and having grooves in its periphery, means providing an annular space between said electric motor stator and said casing, means for conducting refrigerant liquid from said condenser to the annular space between said electric motor stator and said casing to cool said electric motor stator and said casing, means for conducting refrigerant vapor from the annular space to said evaporator, a rotor and shaft assembly rotatably mounted in said casing, fan means mounted on said rotor and shaft assembly for circulating refrigerant vapor over the surfaces of said shaft and rotor assembly, said stator and said casing to transfer heat from said shaft and rotor assembly and said stator to said casing, and means for additionally conducting refrigerant liquid

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Motor Or Generator Cooling System (AREA)

Description

Nov. 23, 1965 A. W. MCCLURE 3,218,825 REFRIGERATING APPARATUS INCLUDING MEANS FOR COOLING COMPRESSOR MOTOR Filed Aug. 14, 1962 ATTORNEYS Nov. 23, 1965 A. w. MGCLURE 3,218,825
REFRIGERATING APPARATUS INCLUDING MEANS FOR COOLING COMPRES SOR MOTOR 2 Sheets-Sheet 2 Filed Aug. 14, 1962 INVENTOR.
ARTHUR W. MC CLURE BY MIM] MV ATTORNEYS United States Patent O 3,218,825 REFRIGERATING APPARATUS INCLUD- ING MEANS FOR COOLING COMPRES- SOR MOTOR Arthur W. McClure, La Crosse, Wis., assigner to The Trane Company, La Crosse, Wis., a corporation of Wisconsin Filed Aug. 14, 1962, Ser. No. 216,842 3 Claims. (Cl. 62-505) This invention relates to refrigerating apparatus of the type including a motor-compressor assembly, and particularly to apparatus in which the motor and compressor are housed in a sealed unit.
It is an object of this invention to provide improved means for cooling the motor of refrigerating apparatus using the liquid refrigerant of the refrigerating apparatus as a heat exchange medium.
It is another object of this invention to conduct liquid refrigerant through passageways of the motor stator to cool the motor stator by evaporation of refrigerant and to provide means for conducting the vaporized refrigerant to the condenser or to the evaporator.
It is another object of the invention to provide means for conducting liquid refrigerant from the condenser to the evaporator only when the motor has a predetermined supply of refrigerant liquid for cooling.
Other objects and advantages of the invention will appear as the specification proceeds to describe the invention with reference to the accompanying drawings in which:
FIGURE 1 is a partly diagrammatic view in elevation of the refrigerating apparatus with portions sectioned to more clearly show the interior construction;
FIGURE 2 is a cross-sectional view taken on line 2-2 of FIGURE l;
FIGURE 3 is an enlarged sectional view taken on an axial plane through one of the stator supporting bars and showing a portion of the interior of the motor; and
FIGURE 4 is a partly diagrammatic view in elevation of a modification of the refrigerating apparatus with portions sectioned to more clearly show the interior construction.
Referring now to FIGURE 1, an electric motor has at one end a first stage compressor 12 and at the other end a second stage compressor 14. A cross-over pipe 16 conducts gas from the discharge of the first stage 12 to the inlet of the second stage 14.
The gas discharged from the second stage 14 flows through a pipe 18 to a condenser 20. The condenser 20 may be of the shell-and-tube type in which cooling water flows through the tubing 22 and the refrigerant is in the shell outside the tubes. Refrigerant liquid condensed in condenser 20 flows by gravity through pipe 23 to a reservoir 24. A conduit 25 is in fluid flow communication with the bottom of reservoir 24 and conducts liquid refrigerant to the motor 10.
A conduit 26 is connected to the reservoir 24 at a point above its bottom to conduct overflow liquid refrigerant when the liquid rises to level 27. A properly sized oat valve 28 maintains a liquid Ievel in the chamber of the valve. Conduit 29 conducts the liquid and flash gas to evaporator 30 which is also of the shell-and-tube type in which the secondary refrigerant liquid such as water or brine flows through the tubing 31 and the refrigerant is in the shell outside the tubing.
The secondary refrigerant liquid circulates between the evaporator 30 and the cooling load served by the refrigeration apparatus to transfer heat from the load to the evaporator 30. In removing heat from the secondary refrigerant, the refrigerant in the evaporator 30` boils forming vapor which passes through the liquid eliminator 3,218,825 Patented Nov. 23, 1965 ICC 32 and thence into the suction pipe 34 of the evaporator 30 to the inlet of the first stage compressor 12.
The motor 10 has a fluid tight casing 36 secured in fluid sealing relationship to the housings of compressors 12 and 14. Bars 37 are secured to the casing 36 and to a motor stator 38 to support the motor stator 38 in the casing 36. As more clearly shown in FIGURE 3, the stator 38 comprises large diameter laminations 43 and smaller diameter laminations 44 thus providing annular spaces 45 between the stator 38 and the casing 36 for the flow of refrigerant. The refrigerant flowing in annular spaces 45 contacts and cools large surface areas of the stator 38, the bars 37, and the casing 36. Rings 40 and 41 are secured to the casing 36 to provide additional support for the stator 38 and bars 37, and to seal the annular spaces 45 from the interior of the motor. A manifold 46 collects the vaporized refrigerant for flow into conduit 47 and thence to condensor 20.
A shaft 48 is rotatably supported in the casing 36 by bearings (not shown) and extends at one end into compressor 12 and has a centrifugal impeller 52 secured thereto. The other end of shaft 48 extends into cornpressor 14 and has a centrifugal impeller 54 secured thereto. A motor rotor 56 is secured to the shaft 48 and has fan blades 58 for circulating the refrigerant vapor over the surfaces of the shaft 48, the rotor 56, the stator 38, and the ends of the stator windings 59. This circulation of refrigerant vapor transfers heat from these parts to the cooled parts of the motor. The spaces surrounding the rotor 56 and the spaces surrounding the end turns of the windings 59 are filled with refrigerant vapor because of the pressures and temperatures existing in these spaces.
Under certain temperature conditions which might occur after a shut down of the apparatus, there can be little or no liquid refrigerant in the casing 36, the conduit 25, and the reservoir 24. When the apparatus is started under such conditions, the refrigerant condensate first produced by condenser 20 flows directly through conduit 25 to the motor casing 36 for motor cooling. Refrigerant liquid does not flow through conduit 26 to the evaporator 30 until the liquid in reservoir 24 rises to the level 27 which is opposite the bottom of the entrance to conduit 26.
With the liquid refrigerant at level 27 in the reservoir 24, the stator 38 is substantially submerged in liquid, because the liquid level in the annular passageways 45 is also substantially at level 27. With this arrangement, substantially all of the outer surfare area of laminations 43 and 44 and substantially all of the surface areas of laminations 43 defining annular spaces 45 are wetted with liquid refrigerant. Very effective cooling of the stator is therefore obtained.
Referring now to FIGURE 4 which shows a modification of the apparatus of FIGURE l and in which corresponding parts have like numerals, the refrigerant liquid flows from condenser 20 through conduit 60 to a float valve 62 which maintains a liquid level in the chamber of the valve. Conduit 64 conducts liquid refrigerant to the motor casing 36. A valve 66 is positioned in the conduit 64 to control the flow therethrough.
A conduit 68 conducts vaporized refrigerant from the manifold 46 of the motor casing 36 to the evaporator 30 at a point below the eliminator 32.
A conduit 70 receives refrigerant liquid which overflows from conduit 64 and conducts such refrigerant liquid to evaporator 30.
The operation of the apparatus of FIGURE 4 is similar to that of FIGURE 1 in that on initiating operation the refrigerant liquid first produced by the condenser 20 flows directly through conduit 64 to the motor casing 36 for motor cooling.
Refrigerant liquid does not flow through conduit 70 until liquid in conduit 64 rises to the outlet to conduit 70. At this condition, the liquid refrigerant in the casing 36 is substantially at the same level as the liquid refrigerant in conduit 70 and the desired effective motor cooling is obtained as explained more fully with reference to FIGURE l.
Although a two-stage compressor has been shown, it should be understood that the apparatus is also applicable to an apparatus in which the motor drives a single stage compressor.
While I have described the foregoing preferred embodiment of my invention, I contemplate that many changes may be made without departing from the scope or spirit of my invention and I desire to be limited only by the claims.
I claim:
1. In refrigerating apparatus, the combination of an evaporator for vaporizing refrigerant, a condenser for liquefying refrigerant, a compressor for circulating refrigerant through said condenser and evaporator, a casing, an electric motor stator mounted in said casing and having grooves in its periphery, means providing an annular space between said electric motor stator and said casing, means for conducting refrigerant liquid from said condenser to the annular space between said electric motor stator and said casing to cool said electric motor stator and said casing, means for conducting refrigerant vapor from said casing, a rotor and shaft assembly rotatably mounted in said casing, fan means mounted on said rotor and shaft assembly for circulating refrigerant vapor over the surfaces of said shaft and rotor assembly, said stator and said casing to transfer heat from said shaft and rotor assembly and said stator to said casing, and means for additionally conducting refrigerant liquid from said condenser to said evaporator when the level of refrigerant liquid in said casing exceeds a predetermined point.
2. In refrigerating apparatus, the combination of an evaporator for vaporizing refrigerant, a condenser for liquefying refrigerant, a compressor for circulating refrigerant through said condenser and evaporator, a casing, an electric motor stator mounted in said casing and having grooves in its periphery, means providing an annular space between said electric motor stator and said casing, means for conducting refrigerant liquid from said condenser to the annular space between said electric r ROBERT A.
motor stator and said casing to cool said electric motor stator and said casing, means for conducting refrigerant vapor from the annular space to said condenser, a rotor and shaft assembly rotatably mounted in said casing, fan means mounted on said rotor and shaft assembly for circulating refrigerant vapor over the surfaces of said shaft and rotor assembly, said stator and said casing to transfer heat from said shaft and rotor assembly and said stator to said casing, and means for additionally conducting refrigerant liquid from said condenser to said evaporator when the level of refrigerant liquid in said casing exceeds a predetermined point.
3. In refrigerating apparatus, the combination of an evaporator for vaporizing refrigerant, a condenser for liquefying refrigerant, a compressor for circulating refrigerant through said condenser and evaporator, a casing, an electric motor stator mounted in said casing and having grooves in its periphery, means providing an annular space between said electric motor stator and said casing, means for conducting refrigerant liquid from said condenser to the annular space between said electric motor stator and said casing to cool said electric motor stator and said casing, means for conducting refrigerant vapor from the annular space to said evaporator, a rotor and shaft assembly rotatably mounted in said casing, fan means mounted on said rotor and shaft assembly for circulating refrigerant vapor over the surfaces of said shaft and rotor assembly, said stator and said casing to transfer heat from said shaft and rotor assembly and said stator to said casing, and means for additionally conducting refrigerant liquid from said condenser to said evaporator when the level of refrigerant liquid in said casing exceeds a predetermined point.
References Cited by the Examiner UNITED STATES PATENTS FOREIGN PATENTS 3/ 1942 Germany. 3/1961 Great Britain.
OLEARY, Primary Examiner.
MEYER PERLIN, Examiner.

Claims (1)

1. IN REFRIGERATING APPARATUS, THE COMBINATION OF AN EVAPORATOR FOR VAPORIZING REFRIGERANT, A CONDENSER FOR LIQUEFYING REFRIGERANT, A COMPRESSOR FOR CIRCULATING REFRIGERANT THROUGH SAID CONDENSER AND EVAPORATOR, A CASING, AN ELECTRIC MOTOR STATOR MOUNTED IN SAID CASING AND HAVING GROOVES IN ITS PERIPHERY, MEANS PROVIDING AN ANNULAR SPACE BETWEEN SAID ELECTRIC MOTOR STATOR AND SAID CASING, MEANS FOR CONDUCTING REFRIGERANT LIQUID FROM SAID CONDENSER TO THE ANNULAR SPACE BETWEEN SAID ELECTRIC MOTOR STATOR AND SAID CASING TO COOL SAID ELECTRIC MOTOR STATOR AND SAID CASING, MEANS FOR CONDUCTING REFRIGERANT VAPOR FROM SAID CASING, A ROTOR AND SHAFT ASSEMBLY ROTATABLY MOUNTED IN SAID CASING, FAN MEANS MOUNTED ON SAID ROTOR AND SHAFT ASSEMBLY FOR CIRCULATING REFRIGERANT VAPOR OVER THE SURFACES OF SAID SHAFT AND ROTOR ASSEMBLY, SAID STATOR AND SAID CASING TO TRANSFER HEAT FROM SAID SHAFT AND ROTOR ASSEMBLY AND SAID STATOR TO SAID CASING, AND MEANS FOR ADDITIONALLY CONDUCTING REFRIGERANT LIQUID FROM SAID CONDENSER TO SAID EVAPORATOR WHEN THE LEVEL OF REFRIGERANT LIQUID IN SAID CASING EXCEEDS A PREDETERMINED POINT.
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Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3331216A (en) * 1965-10-13 1967-07-18 Worthington Corp Liquid refrigerant cooled motor feed assurance means
US3358466A (en) * 1966-04-25 1967-12-19 American Radiator & Standard Auxiliary compressor in motor casing for controlling pressure therein
US3388559A (en) * 1966-12-13 1968-06-18 Westinghouse Electric Corp Electric motors cooled with refrigerants
US3440835A (en) * 1966-10-28 1969-04-29 Carrier Corp Apparatus for controlling refrigerant flow
US3447335A (en) * 1967-09-22 1969-06-03 John D Ruff Variable capacity centrifugal heat pump
US3645112A (en) * 1970-07-13 1972-02-29 Carrier Corp Refrigerant cooling system for electric motor
US3805101A (en) * 1972-07-03 1974-04-16 Litton Industrial Products Refrigerant cooled electric motor and method for cooling a motor
DE2508417A1 (en) * 1974-05-30 1975-12-11 Dunham Bush Inc COLD GENERATION SYSTEM
EP0297691A1 (en) * 1987-06-11 1989-01-04 Acec Energie S.A. Motor and compressor combination
US6009722A (en) * 1997-12-26 2000-01-04 Lg Electronics Inc. Motor cooling structure for turbo
EP1467104A1 (en) * 2003-04-11 2004-10-13 Thermodyn Compressor unit with assisted cooling
US20080098768A1 (en) * 2006-11-01 2008-05-01 Honeywell International Inc. Electric motor cooling jacket resistor
US20140265657A1 (en) * 2013-03-12 2014-09-18 Regal Beloit America, Inc. Electric machine with liquid cooling and method of assembling
US20140363311A1 (en) * 2012-02-07 2014-12-11 Johnson Controls Technology Company Hermetic motor cooling and control
US20190293088A1 (en) * 2018-03-23 2019-09-26 Honeywell International Inc. Two phase cooling for integrated components
US11022351B2 (en) 2015-08-04 2021-06-01 Carrier Corporation Liquid sensing for refrigerant-lubricated bearings
US11779302B2 (en) 2018-10-20 2023-10-10 Massachusetts Institute Of Technology Methods and apparatus for imaging with conformable ultrasound patch

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE718688C (en) * 1940-07-30 1942-03-18 Siemens Ag Compression refrigeration machine
US2746269A (en) * 1955-03-17 1956-05-22 Trane Co Plural stage refrigerating apparatus
US2768511A (en) * 1955-03-21 1956-10-30 Trane Co Motor compressor cooling in refrigerating apparatus
GB863964A (en) * 1958-08-18 1961-03-29 American Radiator & Standard Improvements in or relating to refrigerating systems
US2986905A (en) * 1960-04-15 1961-06-06 Vilter Mfg Co Refrigerating system

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE718688C (en) * 1940-07-30 1942-03-18 Siemens Ag Compression refrigeration machine
US2746269A (en) * 1955-03-17 1956-05-22 Trane Co Plural stage refrigerating apparatus
US2768511A (en) * 1955-03-21 1956-10-30 Trane Co Motor compressor cooling in refrigerating apparatus
GB863964A (en) * 1958-08-18 1961-03-29 American Radiator & Standard Improvements in or relating to refrigerating systems
US2986905A (en) * 1960-04-15 1961-06-06 Vilter Mfg Co Refrigerating system

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3331216A (en) * 1965-10-13 1967-07-18 Worthington Corp Liquid refrigerant cooled motor feed assurance means
US3358466A (en) * 1966-04-25 1967-12-19 American Radiator & Standard Auxiliary compressor in motor casing for controlling pressure therein
US3440835A (en) * 1966-10-28 1969-04-29 Carrier Corp Apparatus for controlling refrigerant flow
US3388559A (en) * 1966-12-13 1968-06-18 Westinghouse Electric Corp Electric motors cooled with refrigerants
US3447335A (en) * 1967-09-22 1969-06-03 John D Ruff Variable capacity centrifugal heat pump
US3645112A (en) * 1970-07-13 1972-02-29 Carrier Corp Refrigerant cooling system for electric motor
US3805101A (en) * 1972-07-03 1974-04-16 Litton Industrial Products Refrigerant cooled electric motor and method for cooling a motor
DE2508417A1 (en) * 1974-05-30 1975-12-11 Dunham Bush Inc COLD GENERATION SYSTEM
EP0297691A1 (en) * 1987-06-11 1989-01-04 Acec Energie S.A. Motor and compressor combination
US6009722A (en) * 1997-12-26 2000-01-04 Lg Electronics Inc. Motor cooling structure for turbo
EP1467104A1 (en) * 2003-04-11 2004-10-13 Thermodyn Compressor unit with assisted cooling
FR2853700A1 (en) * 2003-04-11 2004-10-15 Thermodyn CENTRIFUGAL MOTOR-COMPRESSOR GROUP WITH ASSISTED REFRIGERATION.
US20080098768A1 (en) * 2006-11-01 2008-05-01 Honeywell International Inc. Electric motor cooling jacket resistor
US7591147B2 (en) 2006-11-01 2009-09-22 Honeywell International Inc. Electric motor cooling jacket resistor
US20140363311A1 (en) * 2012-02-07 2014-12-11 Johnson Controls Technology Company Hermetic motor cooling and control
US9291167B2 (en) * 2012-02-07 2016-03-22 Johnson Controls Technology Company Hermetic motor cooling and control
US20140265657A1 (en) * 2013-03-12 2014-09-18 Regal Beloit America, Inc. Electric machine with liquid cooling and method of assembling
US9755482B2 (en) * 2013-03-12 2017-09-05 Regal Beloit America, Inc. Electric machine with liquid cooling and method of assembling
US11022351B2 (en) 2015-08-04 2021-06-01 Carrier Corporation Liquid sensing for refrigerant-lubricated bearings
US20190293088A1 (en) * 2018-03-23 2019-09-26 Honeywell International Inc. Two phase cooling for integrated components
US11156231B2 (en) * 2018-03-23 2021-10-26 Honeywell International Inc. Multistage compressor having interstage refrigerant path split between first portion flowing to end of shaft and second portion following around thrust bearing disc
US11779302B2 (en) 2018-10-20 2023-10-10 Massachusetts Institute Of Technology Methods and apparatus for imaging with conformable ultrasound patch

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