US20160273812A1 - method and device for cooling a motor - Google Patents

method and device for cooling a motor Download PDF

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Publication number
US20160273812A1
US20160273812A1 US14/785,910 US201414785910A US2016273812A1 US 20160273812 A1 US20160273812 A1 US 20160273812A1 US 201414785910 A US201414785910 A US 201414785910A US 2016273812 A1 US2016273812 A1 US 2016273812A1
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US
United States
Prior art keywords
coolant
compression stage
motor
stage
recited
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
Application number
US14/785,910
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English (en)
Inventor
Simon Klink
Max Meise
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Assigned to ROBERT BOSCH GMBH reassignment ROBERT BOSCH GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MEISE, MAX, KLINK, SIMON
Publication of US20160273812A1 publication Critical patent/US20160273812A1/en
Abandoned legal-status Critical Current

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Classifications

    • 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
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • 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
    • F25B31/02—Compressor arrangements of motor-compressor units
    • F25B31/026—Compressor arrangements of motor-compressor units with compressor of rotary 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
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/30—Expansion means; Dispositions thereof
    • F25B41/39—Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator
    • 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
    • F25B49/00—Arrangement or mounting of control or safety devices
    • F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
    • F25B49/025—Motor control arrangements
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/13—Economisers
    • 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
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/23—Separators

Definitions

  • the present invention relates to a method for cooling a motor according to the definition of the species of claim 1 , and to a device for implementing the method.
  • Such a coolant circuit equipped with a two-stage compressor is used in connection with heat pumps, for instance.
  • the two compression stages of the compressor are driven via a motor, to which it is connected for this purpose.
  • the coolant gas is compressed from a low level to a medium level.
  • the pressure level is then increased further until the coolant has attained a high pressure level.
  • Via a capacitor connected downstream from the second compression stage heat can then be output by the coolant, which is subsequently expanded and can once again absorb heat in an evaporator in order to be supplied in gaseous form to the first compression stage of the compressor.
  • such a coolant circuit makes it possible to achieve heating or cooling of a space.
  • the coolant is simultaneously used for cooling the motor, which is able to be operated at an optimal operating temperature in this way.
  • the motor of the compressor is usually cooled either by the coolant aspirated by the compressor or by the already compressed gaseous coolant.
  • the waste heat of the motor is conveyed to the gaseous coolant either directly prior to or directly following the compression.
  • coolant circuits having two-stage compressors which include a first compression stage and a second compression stage, it is known to cool the motor with the aid of the coolant that is at the medium pressure level.
  • the present invention is based on the objective of overcoming the disadvantages of the related art and, in particular, of providing a method and a device for cooling a motor in which the waste heat of the motor is returned into the cooling circuit without any negative effect on the efficiency of the overall system.
  • the production expense and the control outlay should be as low as possible and the fewest components possible should suffice.
  • the present invention provides for cooling of the motor by a two-phase coolant main flow that exhibits the medium pressure level.
  • the two-phase coolant main flow contains both gaseous and fluid coolant. Since the coolant main flow, that is to say, usually the entire coolant flow, is utilized for cooling the motor, no additional expansion valves are required. Accordingly, no corresponding control is necessary.
  • the waste heat dissipated by the motor has no negative influence on the efficiency, since no negative effect arises either on the individual pressure side or the individual suction side of the compression stages.
  • the method is used between two of the compression stages.
  • the method may be used between two coolant compressors. It is also possible to cool more than one motor, in which case each motor may possibly be allocated its own coolant circuit.
  • the coolant main flow is split into a fluid coolant component and a gaseous coolant component after cooling of the motor, the gaseous coolant component being supplied to the second compression stage and the fluid coolant component to the first compression stage of the two-stage compressor.
  • the two-phase coolant main flow is therefore split up into the two phases, the gaseous component being compressed further in the second compression stage.
  • a medium pressure accumulator may be used for separating the phases of the coolant from the coolant main flow, this being a collection container in which the coolant is separated into a gaseous component and a fluid component.
  • the coolant is preferably evaporated while absorbing heat before the first compression stage, and condensed while outputting heat following the second compression stage. Following the subdivision of the coolant main flow into the liquid and the gaseous coolant component, an expansion of the fluid coolant component therefore takes place, with a subsequent evaporation in an evaporator, in which heat from the environment is able to be absorbed, for example. This induces the previously fluid coolant component to transition to the gaseous phase as well, whereupon it is supplied, in gaseous form, to the first compression stage of the two-stage compressor, to be compressed and heated there.
  • a capacitor may be provided, for instance following the second compression stage, in which the previously gaseous coolant is condensed and, for example, heat is output to the environment in the process. From there, the coolant is conducted further under high pressure and in partially liquid form and subsequently expanded to the medium pressure level.
  • the coolant component is combined with the coolant component that has come from the second compression stage after emitting heat, before being used for cooling the motor. A combination of the two coolant components thus takes place, so that the entire coolant flow is available for cooling the motor.
  • the coolant component is supplied directly to the second compression stage following the first compression stage; the center portion, which is gaseous once the motor has been cooled, is supplied to the second compression stage and combined with the coolant component coming from the first compression stage; the coolant that forms the coolant main flow and comes from the second compression stage after outputting heat is used for cooling the motor.
  • the device has a motor and a coolant circuit in which a two-stage compressor is situated, which has a first compression stage and a second compression stage able to be driven by the motor; and that a motor cooling system is integrated into the coolant circuit in such a way that a coolant main flow is able to be flow through it, and a phase separation element is situated downstream from the motor cooling system in the direction of flow, which is connected to the second compression stage via a suction gas line for a gaseous coolant component and to the first compression stage of the two-stage coolant compressor via a first line for a fluid coolant component.
  • An additional bypass link including additional expansion valves for supplying the motor cooling system can be dispensed with. Instead, the motor cooling system is simply traversed by the coolant main flow, which is able to absorb the corresponding heat. No additional control is required, for this purpose, so that the production and control expense is kept low.
  • an evaporator and possibly a throttle element as well additional components are disposed in the first line, upstream from the first compression stage. This makes it possible for the previously fluid coolant component to expand and to evaporate, so that it is able to be supplied to the first compression stage in gaseous form. Heat absorption from an environment, which is cooled as a result, takes place in the evaporator.
  • the further components include filters or similar items, for example.
  • a capacitor and possibly a throttle element as well as possibly additional components are disposed in a second line of the coolant circuit, downstream from the second compression stage. Following the second compression stage, heat can be dissipated to the environment from the gaseous coolant component in the capacitor, which at least partially liquefies this coolant component.
  • the throttle element which may be developed as a simple throttle or as an expansion valve, for example, this coolant component is expanded, so that it is able to be utilized for cooling the motor at a medium pressure level in liquid and/or gaseous form.
  • the further components for example, may be developed as cooling elements for a power electronics system or a similar device.
  • a mixing device which is connected to a pressurized gas line coming from the first compression stage, and to the second line, is situated in the coolant circuit upstream from the motor cooling system. That is to say, the coolant component coming from the first compression stage and the coolant component coming from the second compression stage meet each other and can jointly be conducted from there to the motor cooling system. The entire coolant flow is therefore used for cooling the motor.
  • the second line is connected to the motor cooling system, a pressurized gas line coming from the first compression stage discharging into the suction gas line leading to the second compression stage.
  • the gaseous coolant component downstream from the phase separation element is able to be combined with the coolant component conveyed from the first to the second compression stage, upstream from the second compression stage.
  • the entire coolant flow is routed to the motor cooling system where it is used for absorbing waste heat.
  • the coolant component coming from the first compression stage is not combined with the coolant component coming from the second compression stage directly upstream from the motor cooling system, but first also travels through the second compression stage.
  • throttle elements and/or additional cooling elements which are used for cooling elements of a power electronics system, for instance.
  • the coolant compressor preferably has more than two compression stages, the method as recited in one of claims 1 through 5 being used between two of the compression stages. In this way even extensive cooling is achievable.
  • the device has two coolant compressors, and the method as recited in one of claims 1 through 5 is applied between the coolant compressors or between compression stages of the coolant compressors, it being possible to cool more than a single motor. In this way the device can be used in a very universal manner.
  • FIG. 1 a first specific development of a coolant circuit having a two-stage compressor
  • FIG. 2 a second specific development of a coolant circuit having a two-stage compressor.
  • FIG. 1 schematically shows a coolant circuit 1 of a heat pump, which has a two-stage compressor 2 equipped with a first compression stage 3 and a second compression stage 4 .
  • Two-stage compressor 2 is operated by a motor 5 ; a mechanical link between motor 5 and compression stages 3 , 4 of two-stage compressor 2 is not shown for reasons of clarity.
  • the pressure level of a coolant is initially raised from a first pressure level to a medium pressure level, and then to a high pressure level.
  • a liquid fluid under overpressure which becomes gaseous following a pressure removal and the absorption of heat, is used as coolant.
  • the coolant is conveyed in gaseous form, for instance, and at a low pressure to first compression stage 3 of compressor 2 , where it is brought to a medium pressure level and heated at the same time.
  • a gaseous coolant component in the coolant circuit according to the present invention then arrives at a mixing device 7 and is combined there with a coolant component that comes from second compression stage 4 .
  • This cooling component was supplied to the second compression stage of compressor 2 in gaseous form at a medium pressure level and was brought to a high pressure level in second compression stage 4 while being heated at the same time.
  • the gaseous coolant component is subsequently conveyed to a capacitor 9 via a second line 8 .
  • heat is output from the cooling component to an environment or a heat sink 10 .
  • the resulting condensed coolant component which may include both liquid and gaseous phases, is subsequently expanded to the medium pressure level with the aid of a throttle element 11 , which is developed as an expansion valve, for instance; coolant component arrives at mixing device 7 at this medium pressure and is combined with the coolant component coming from first compression stage 3 .
  • the combined coolant components i.e., the coolant main flow, which includes the entire volumetric flow, travels from mixing device 7 to a motor cooling system of motor 5 and absorbs heat from motor 5 there. Then, the coolant main flow is separated into the gaseous coolant component and the liquid cooling component in a phase separation element 12 . The gaseous coolant component is subsequently conveyed to second compression stage 4 again.
  • the liquid cooling component is expanded with the aid of a throttle element 13 , which may once again be developed as an expansion valve, and conveyed at a low pressure and low temperature to an evaporator 14 in which the liquid coolant component is transferred into a gaseous phase.
  • evaporator 14 absorbs heat from the environment or a heat sink 15 , which is absorbed by the coolant component.
  • Throttle element 13 and evaporator 14 are situated in a first line 16 , which connects phase separation element 12 to first compression stage 3 of two-stage compressor 2 .
  • the pressure of the coolant component evaporated in evaporator 14 is then increased in first compression stage 3 , so that it is able to be conveyed to mixing device 7 again at a medium pressure level and at an increased temperature.
  • FIG. 2 shows an alternative preferred exemplary embodiment, in which corresponding elements have been provided with matching reference numerals.
  • the coolant component is not conveyed to a mixing device upstream from the motor cooling system following first compression stage 3 , but directly to second compression stage 4 . Since the gaseous coolant component coming from phase separation element 12 is conveyed to second compression stage 4 as well, the coolant main flow is brought to the high pressure level in second compression stage 4 and heated in the process. Following the heat dissipation and condensation in condenser 9 and the subsequent expansion via throttle element 11 , the coolant main flow, which has gaseous and liquid components, arrives at the cooling system of motor 5 and can the absorb heat there.
  • phase separation element 12 The fluid coolant component separated from the coolant main flow by phase separation element 12 is conveyed via first line 16 and initially expanded to a low pressure level with the aid of throttle element 13 . This is followed by an evaporation in evaporator 14 , so that it is ultimately supplied to first compression stage 3 of compressor 3 in gaseous form, where it is brought to a medium pressure level while being heated at the same time, in order to then reach second compression stage 4 .
  • cooling of the motor that is required for driving the two-stage compressor takes place with the aid of the coolant main flow, i.e., by the entire coolant.
  • An additional bypass link in order to divert a portion of the coolant for cooling the motor is not required. This results in a simplified design, especially on account of the reduced number of required expansion valves, and thus in a less complex control.
  • the waste heat from the motor is supplied to the coolant circuit again without reducing the efficiency of the overall system because of the phase separation that takes place after the waste heat has been absorbed.
  • the procedure according to the present invention is adaptable to a coolant circuit having a single-stage compressor, an intermediate injection and an internal heat transmitter being able to be used or also an intermediate injection and a phase separation in a phase separation element.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
US14/785,910 2013-04-23 2014-04-02 method and device for cooling a motor Abandoned US20160273812A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102013207344.5 2013-04-23
DE102013207344.5A DE102013207344A1 (de) 2013-04-23 2013-04-23 Verfahren und Vorrichtung zum Kühlen eines Motors
PCT/EP2014/056567 WO2014173641A1 (fr) 2013-04-23 2014-04-02 Procédé et dispositif de refroidissement d'un moteur

Publications (1)

Publication Number Publication Date
US20160273812A1 true US20160273812A1 (en) 2016-09-22

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Application Number Title Priority Date Filing Date
US14/785,910 Abandoned US20160273812A1 (en) 2013-04-23 2014-04-02 method and device for cooling a motor

Country Status (5)

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US (1) US20160273812A1 (fr)
EP (1) EP2989397B1 (fr)
CN (1) CN105143790B (fr)
DE (1) DE102013207344A1 (fr)
WO (1) WO2014173641A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160332504A1 (en) * 2015-05-15 2016-11-17 Ford Global Technologies, Llc System and method for de-icing a heat pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3692309A1 (fr) * 2017-10-04 2020-08-12 BITZER Kühlmaschinenbau GmbH Système de compresseur frigorifique

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6070421A (en) * 1996-04-18 2000-06-06 Samjin Co., Ltd. 5 or 8 kW refrigerating system and centrifugal compressor assembly for said system

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
US2746269A (en) * 1955-03-17 1956-05-22 Trane Co Plural stage refrigerating apparatus
US3232074A (en) * 1963-11-04 1966-02-01 American Radiator & Standard Cooling means for dynamoelectric machines
FR2620205A1 (fr) * 1987-09-04 1989-03-10 Zimmern Bernard Compresseur hermetique pour refrigeration avec moteur refroidi par gaz d'economiseur
CN1108501C (zh) * 1996-04-18 2003-05-14 株式会社三进 5或8kw制冷系统的离心式压缩机组
KR100288315B1 (ko) * 1999-03-15 2001-04-16 김평길 2단 원심압축기
US7600390B2 (en) * 2004-10-21 2009-10-13 Tecumseh Products Company Method and apparatus for control of carbon dioxide gas cooler pressure by use of a two-stage compressor
CN201488382U (zh) * 2009-09-11 2010-05-26 河南千年冷冻设备有限公司 一种双级制冷系统

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6070421A (en) * 1996-04-18 2000-06-06 Samjin Co., Ltd. 5 or 8 kW refrigerating system and centrifugal compressor assembly for said system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160332504A1 (en) * 2015-05-15 2016-11-17 Ford Global Technologies, Llc System and method for de-icing a heat pump
US10391835B2 (en) * 2015-05-15 2019-08-27 Ford Global Technologies, Llc System and method for de-icing a heat pump

Also Published As

Publication number Publication date
DE102013207344A1 (de) 2014-10-23
CN105143790B (zh) 2018-02-23
EP2989397B1 (fr) 2020-06-10
WO2014173641A1 (fr) 2014-10-30
EP2989397A1 (fr) 2016-03-02
CN105143790A (zh) 2015-12-09

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Owner name: ROBERT BOSCH GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KLINK, SIMON;MEISE, MAX;SIGNING DATES FROM 20160315 TO 20160318;REEL/FRAME:038330/0441

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION