EP2873858B1 - Electric compressor - Google Patents

Electric compressor Download PDF

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Publication number
EP2873858B1
EP2873858B1 EP13791594.8A EP13791594A EP2873858B1 EP 2873858 B1 EP2873858 B1 EP 2873858B1 EP 13791594 A EP13791594 A EP 13791594A EP 2873858 B1 EP2873858 B1 EP 2873858B1
Authority
EP
European Patent Office
Prior art keywords
housing
compressing mechanism
electric motor
introducing passage
intake port
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.)
Active
Application number
EP13791594.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2873858A4 (en
EP2873858A1 (en
Inventor
Hironobu Deguchi
Norikatsu Kiso
Kyung-Jae Lee
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.)
Valeo Japan Co Ltd
Original Assignee
Valeo Japan Co Ltd
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 Valeo Japan Co Ltd filed Critical Valeo Japan Co Ltd
Publication of EP2873858A1 publication Critical patent/EP2873858A1/en
Publication of EP2873858A4 publication Critical patent/EP2873858A4/en
Application granted granted Critical
Publication of EP2873858B1 publication Critical patent/EP2873858B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps
    • 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
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • 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
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/123—Fluid connections
    • 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
    • F04C29/04—Heating; Cooling; Heat insulation
    • F04C29/047—Cooling of electronic devices installed inside the pump housing, e.g. inverters
    • 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
    • F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
    • 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
    • F04C2240/00—Components
    • F04C2240/30—Casings or housings
    • 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
    • F04C2240/00—Components
    • F04C2240/40—Electric motor
    • 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
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/808—Electronic circuits (e.g. inverters) installed inside the machine
    • 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
    • F04C29/04—Heating; Cooling; Heat insulation
    • F04C29/045—Heating; Cooling; Heat insulation of the electric motor in hermetic pumps

Definitions

  • the present invention relates to an electric compressor including a compressing mechanism and an electric motor configured to drive the compressing mechanism in a housing, and configured to introduce compressed fluid into the compressing mechanism via an electric motor storage space that houses the electric motor.
  • Patent Literatures 1 to 3 are publicly known as an electric compressor provided with a compressing mechanism and an electric motor configured to drive the compressing mechanism in a housing.
  • Patent Literature 1 JP-A-2000-291557
  • Patent Literature 2 JP-A-2005-291004 disclose a configuration of an electric compressor for refrigerant compression configured to have a compressing mechanism and an electric motor integrated with each other, in which the housing is formed by assembling a discharging housing, an intermediate housing, and an intake housing by fastening in an axial direction with a bolt, a partitioning wall is provided in the intake housing, an intake port is formed on a side surface biased to the intermediate housing with respect to the partitioning wall, a space encapsulated by a lid member is formed on an outside of the partitioning wall, a drive circuit including a control circuit and an inverter integrated with each other is stored in the space, and the drive circuit is provided in the vicinity of the intake port, whereby a switching element which constitutes the inverter is cooled by refrigerant gas.
  • Patent Literature 3 JP-A-2008-184995 discloses an electric compressor including a compressing mechanism (compressing portion) and an electric motor configured to drive the compressing mechanism provided in the housing, wherein a plurality of refrigerant passages in which refrigerant flows in an axial direction are arranged in a direction of rotation between the housing and a stator core, one of the plurality of refrigerant passages is arranged so as to oppose the drive circuit via the housing, other refrigerant passages than the one refrigerant passage are closed by a restraining member arranged between one end side of the housing in the axial direction and the stator core to prevent the refrigerant taken from a refrigerant inlet port from flowing into the other cooling passages, and a deviation of a stress distribution in the direction of rotation is reduced between the housing and the stator core, whereby the drive circuit is cooled sufficiently while securing a pressure capacity of the housing.
  • Patent Literature 4 ( US 6 131 406 A ) discloses a refrigerant compressor having a cooling duct for the motor originating from an outer cooling duct connection.
  • Patent Literatures 1 and 2 have a configuration in which the intake port is arranged on an outer peripheral wall located between the electric motor located in the vicinity of the drive circuit and the drive circuit for cooling the drive circuit by an intake refrigerant, the electric compressor needs to secure a margin for forming the intake port between the electric motor and the drive circuit, and hence the length in the axial direction is increased, and hence there arises a problem that demands of a reduction in size cannot be achieved.
  • the intake port In order to cool the drive circuit, the intake port needs to be arranged as close to the drive circuit as possible, and hence a position for forming the intake port and a layout of refrigerant routes are limited.
  • an object of the invention mainly to provide an electric compressor which allows a reduction in size by reducing a dimension in an axial direction, and allows to enhance flexibility of the position for forming the intake port and layout of a refrigerant route. It is another object to enable the drive circuit to be cooled sufficiently without providing the intake port in the vicinity of the drive circuit.
  • an electric compressor is provided with the features according to claim 1.
  • the fluid introducing passage extended along the axial direction of the drive shaft is formed between the housing and the stator core, and the intake port configured to introduce the compressed fluid is connected to the fluid introducing passage at a position facing the outer peripheral surface of the stator core, a margin of formation of the intake port needs not to be secured between the drive circuit and the motor, so that a reduction in size of the electric compressor can be achieved by reducing an axial dimension of the housing.
  • the position for forming the intake port can be formed at an arbitrary position in the axial direction within a range facing the outer peripheral surface of the stator core, flexibility of the position for forming the intake port and flexibility of layout of a refrigerant route can be enhanced.
  • a restraining mechanism configured to restrain a flow of the compressed fluid flowing in the fluid introducing passage from the intake port toward a compressing mechanism side may be provided between the intake port and the compressing mechanism in the axial direction of the drive shaft.
  • the compressed fluid flowing in from the intake port can be flowed to the compressing mechanism side through gaps between the coils of the stator and a gap between the stator and the rotor after having been flowed once to a side opposite to the compressing mechanism, whereby cooling of the coils can be accelerated.
  • Examples of the modes of the restraining mechanism as described above include (i) a configuration in which a compressing mechanism side opening edge of the fluid introducing passage is throttled or closed by part of the housing, (ii) a configuration in which a cross section of a passage of a portion biased to the compressing mechanism side with respect to the intake port of the fluid introducing passage is throttled or closed, and (iii) a configuration in which a downstream side of the fluid introducing passage is throttled or closed by a bobbin provided at a coil end at a position biased to the compressing mechanism side with respect to the fluid introducing passage.
  • a clearance extending along the axial direction of the drive shaft may formed between the housing and the stator core at a position different from the fluid introducing passage, and the restraining mechanism configured to restrain a flow of the compressed fluid may be provided at a portion of the clearance.
  • the clearance extending along the axial direction of the drive shaft is formed between the housing and the stator core at a position different from the fluid introducing passage in a circumferential direction of the stator core, a deviation of stress distribution (concentration of the stress to a specific position on the housing) generated in the housing may be alleviated when assembling the stator core to the housing by press-fitting thereto.
  • the restraining mechanism configured to restrain a flow of the compressed fluid is provided in the clearance, a flow of the compressed fluid taken therein can be flowed into the gaps between the coils and the gap between the rotor and the stator positively by restraining a flow of the compressed fluid to the clearance so that cooling of the rotor and the stator can be accelerated.
  • the inverter storage space may be provided at an axial end portion of the housing on a side opposite to a side where the compressing mechanism is provided, or provided along an outer peripheral wall of the housing.
  • the compressed fluid flowed from the intake port flows also to the axial end portion on the side opposite to the side where the compressing mechanism is provided via the fluid introducing passage, even when the inverter is provided at the axial end portion on the side opposite to the compressing mechanism, the inverter can be cooled efficiently.
  • the restraining mechanism configured to restrain the flow of the compressed fluid flowing in the fluid introducing passage from the intake port to the compressing mechanism side, most part or all of the compressed fluid flowed in from the intake port is introduced to a side opposite to the compressing mechanism side, whereby the cooling of the inverter board can further be accelerated.
  • the inverter since the compressed fluid flowed in from the intake port flows into or is filled in the fluid introducing passage and the clearance in the axial direction along the outer peripheral wall of the hosing, even though the inverter is provided on the outer peripheral wall of the housing, the inverter can be cooled efficiently.
  • the inverter storage space is provided radially outside of the fluid introducing passage along the fluid introducing passage, the inverter can be cooled by refrigerant immediately after flowing into the fluid introducing passage from the intake port.
  • a passage cross section of the fluid introducing passage may be formed to be larger than the passage cross section of the clearance.
  • the clearance needs only to have a small gap.
  • the fluid introducing passage constitutes the inflow route of the compressed fluid, an increase in resistance in the passage therein can be avoided by securing a large surface area.
  • reducing the passage cross section of the clearance by securing a slight amount of clearance, a reduction in size of the compressor is also achieved.
  • the fluid introducing passage extended along the axial direction of the drive shaft is formed between the housing and the stator core, and the intake port configured to introduce the compressed fluid is provided at the position of the housing facing the outer peripheral surface of the stator core and is connected to the fluid introducing passage, the axial dimension of the housing can be reduced. A reduction in size of the electric compressor is also possible.
  • the compressed fluid flowing in from the intake port can be flowed to the compressing mechanism side through gaps between the coils of the stator and a gap between the stator and the rotor after having been flowed once to a side opposite to the compressing mechanism.
  • the cooling of the stator can be accelerated.
  • the clearance is formed between the housing and the stator core at a position different from the fluid introducing passage so as to extend along the axial direction of the drive shaft, and the restraining mechanism configured to restrain the flow of the compressed fluid is provided at a portion of the clearance, the deviation of stress distribution generated in the housing when the stator core is assembled can be alleviated, and even though the clearance is provided, the compressed fluid taken from the intake port is allowed to flow in the gaps between the coils and in the gap between the rotor and the stator by restraining the flow of the compressed fluid thereto and therefrom, so that the cooling of the rotor and the stator can be accelerated.
  • the inverter storage space that houses the inverter board in which driving of the electric motor is controlled is provided at the axial end portion of the housing on the side opposite to the side where the compressor is provided, or provided along an outer peripheral wall of the housing, the inverter can be cooled efficiently.
  • the passage cross section of the fluid introducing passage By forming the passage cross section of the fluid introducing passage to be larger than the passage cross section of the clearance, an increase in resistance in the fluid introducing passage can be avoided while facilitating the assembly at the time of press-fitting the stator core and, by reducing the passage cross section of the clearance, a radial dimension of the housing can be reduced and hence a reduction in size of the electric compressor can be realized.
  • an electric compressor 1 suitable for a freezing cycle using refrigerant as working fluid is illustrated.
  • the electric compressor 1 is provided with a compressing mechanism 3 in a housing 2 formed of aluminum alloy on the rightward in the drawing, and an electric motor 4 configured to drive the compressing mechanism on the left side in the drawing.
  • the left side in the drawing is defined as the front of the compressor, and the right side in the drawing is defined as the rear side of the compressor.
  • the housing 2 includes a compressing mechanism storage housing member 2a that houses the compressing mechanism 3, an electric motor storage housing member 2b that houses the electric motor 4 configured to drive the compressing mechanism 3, and an inverter storage housing member 2c that houses the board, which is not illustrated, including a drive circuit having a control circuit configured to control the driving of the electric motor 4 and an inverter integrated with each other mounted thereon fastened in the axial direction with fastening bolts 5.
  • a partitioning wall 8 including an axially supporting portion 8a formed integrally therewith is provided on a side of the electric motor storage housing member 2b facing the compressing mechanism storage housing member 2a, a partitioning wall 9 including an axially supporting portion 9a formed integrally therewith is provided on a side of the inverter storage housing member 2c facing the electric motor storage housing member 2b, and a drive shaft 10 is rotatably supported by the axially supporting portions 8a, 9a of the partitioning walls 8, 9 via bearings 11 and 12.
  • an interior of the housing 2 is divided into a compressing mechanism storage space (not illustrated) that houses the compressing mechanism 3, an electric motor storage space 12a that houses the electric motor 4, and an inverter storage space 12b that houses an inverter circuit board from the rear.
  • the inverter storage space 12b is defined by closing an opening end of the inverter storage housing member 2c with a lid member 7.
  • the compressing mechanism 3 itself is a known scroll type having a fixed scroll member and a turning scroll member arranged so as to oppose thereto, for example, includes the fixed scroll member having a disc-shaped end plate fixed to the housing, a cylindrical outer peripheral wall provided over an entire circumference along an outer edge of the end plate and extending upright toward the front, the fixed scroll member including a spiral-shaped spiral wall extending from the end plate toward the front inside the outer peripheral wall, and the turning scroll member having a disc-shaped end plate, a spiral-shaped spiral wall extending upright toward the rear from the end plate, an eccentric shaft provided at a rear end portion of the drive shaft connected to a boss portion formed on a back surface of the end plate, and the turning scroll member being supported about an axial center of the drive shaft so as to be capable of making an orbital motion, and includes a compression chamber with a space surrounded by the end plate and the spiral wall of the fixed scroll member, and the end plate and the spiral wall of the turning scroll member by engaging the spiral walls of the fixed scroll member and the turning scroll
  • a refrigerant inflow port configured to suck the refrigerant introduced from the intake port, which will be described later, via the electric motor storage space 12a is formed between the outer peripheral wall of the fixed scroll member and an outermost peripheral portion of the spiral wall of the turning scroll member, and a discharge port configured to discharge refrigerant gas compressed in the compression chamber is formed at a substantially center of the end plate of the fixed scroll member.
  • a rotor 22 rotates and hence the drive shaft 10 rotates, the turning scroll member makes an orbital motion about the axial center of the drive shaft 10, the compression chamber is moved from an outer peripheral side of the spiral wall of the both scroll members toward the center while gradually reducing the volumetric capacity, the refrigerant gas is compressed and the compressed refrigerant gas is discharged via the discharge port formed in the end plate of the fixed scroll member.
  • the electric motor storage space 12a formed in a portion in the housing 2 on the front side of the partitioning wall 8 houses a stator 21 and the rotor 22 which constitute the electric motor 4.
  • the stator 21 includes a cylindrical stator core 24 and coils 25 wound therearound (indicated by broken lines in Fig. 2 ), and is fixed to an inner surface of the housing 2 (the electric motor storage housing member 2b).
  • the rotor 22 that houses a magnet is fixedly mounted on the drive shaft 10 inside the stator 21.
  • the rotor 22 is rotated by a rotational magnetic force generated by the stator 21, and rotates the drive shaft 10.
  • Reference numeral 28 denotes a bobbin mounted at an axial end portion (coil end) of the coils 25.
  • An intake port 30 configured to intake the refrigerant gas is formed on a side surface of the housing 2 facing the electric motor storage space 12a (the electric motor storage housing member 2b), so that the refrigerant (compressed fluid) is flowed into the electric motor storage space 12a via the intake port 30 and is introduced into the compressing mechanism through the electric motor storage space 12a.
  • the stator core 24 is fixed to the housing 2 by being press-fitted thereto, and is fixedly positioned in the axial direction with the end surface thereof being abutted against a stepped portion 26 formed on the housing.
  • a fluid introducing passage 31 extending along the axial direction of the drive shaft 10 is formed between the housing 2 (the electric motor storage housing member 2b) and the stator 21 (the stator core 24).
  • the fluid introducing passage 31 extends over the entire axial length of the rotor 22, and has an inner peripheral wall of the housing 2 depressed to define a passage with respect to the stator core 24.
  • the intake port 30 configured to introduce the compressed fluid is provided at a position of the housing 2 (the electric motor storage housing member 2b) facing an outer peripheral surface of the stator core 24 and is connected to the fluid introducing passage 31.
  • the intake port 30 extends in the radial direction of the stator 21, and more specifically, extends toward right upward of the stator, and is connected to the fluid introducing passage 31 in the vertical direction.
  • the fluid introducing passage 31 is formed on a portion of the housing facing the outer peripheral surface of the stator core 24 biased to the compressing mechanism (in the vicinity of the end surface of the stator core 24 on the compressing mechanism side).
  • clearances 41 extending along an axial direction of the drive shaft are formed between the housing and the stator core at a position different from the fluid introducing passage 31 in the circumferential direction.
  • a plurality of the clearances 41 are formed in the circumferential direction substantially equidistantly, and in this example, the inner peripheral wall of the housing is depressed to define gaps with respect to the stator core 24.
  • Grooves 42 formed on the outer peripheral surface of the stator core 24 by being depressed therefrom so as to extend in the axial direction for allowing the fastening bolts 5 to pass therethrough are formed in a portion provided with the fluid introducing passage 31 and portions where the respective clearances 41 are formed.
  • the stepped portion 26 formed on an inner wall of the housing for axially positioning the stator core is formed over the substantially entire circumference and, as illustrated in Fig. 4(a) , a compressing mechanism side opening edge of the fluid introducing passage 31 is closed by the stepped portion 26.
  • a first restraining mechanism configured to restrain a flow of refrigerant flowing in the fluid introducing passage 31 from the intake port 30 toward the compression mechanism is formed between the intake port 30 and the compressing mechanism 3 in the axial direction of the drive shaft.
  • the clearance 41 is provided with a second restraining mechanism that restrains the flow of the compressed fluid flowing therethrough.
  • the second restraining mechanism is configured, for example, by providing a projecting ridge 43 projecting toward the stator core on the inner surface of the housing and bringing the projecting ridge 43 into proximity to the stator core 24 or bringing the projecting ridge 43 into abutment with the stator core 24 as illustrated in Fig. 5 .
  • the portion where the projecting ridge 43 is provided in the clearance 41 may be a portion biased toward the compressing mechanism, a portion biases toward an inverter apparatus, or a substantially center portion.
  • the passage cross section of the fluid introducing passage 31 is set to be larger than the passage cross section of each of the clearances 41.
  • the spaces in the front and the rear of the stator 21 are communicated with each other via gaps between the stator core 24 and the rotor 22 and gaps between the coils 25 wound around the stator core 24, and the fluid introducing passage 31 formed between the stator 21 and the housing 2 (the electric motor storage housing member 2b), the spaces in the front and the rear of the stator 21, and gaps between the coils and between the stator 21 and the rotor 22 define an intake route for guiding the refrigerant flowing in from the intake port 30 to the compressing mechanism 3 in the electric motor storage space 12a that houses the electric motor 4.
  • the refrigerant flowing into the electric motor storage space 12a via the intake port 30 enters the fluid introducing passage 31.
  • the end portion of the fluid introducing passage 31 on the compressing mechanism side is closed by the stepped portion 26 of the housing 2 (since the first restraining mechanism configured to restrain the flow of the refrigerant flowing in the fluid introducing passage 31 from the intake port 30 to the compressing mechanism side is provided)
  • the refrigerant flowed therein flows from the intake port 30 toward the inverter (the side opposite to the compressing mechanism side) , and is introduced to a space between the stator 21 and the partitioning wall 9 (a space in the front of the stator 21).
  • the refrigerant flows along the inverter storage space 12b (along the partitioning wall 9) and moves through the clearance between the coils and the gap between the stator 21 and the rotor 22, and is introduced from the refrigerant inflow port, which is not illustrated, of the compressing mechanism into the compressing mechanism.
  • the intake port 30 is provided at a portion facing an outer peripheral surface of the stator core 24, the refrigerant may be introduced to the compressing mechanism 3 reliably through between the coils and the gap between the stator 21 and the rotor 22, and hence the stator 21 can be cooled effectively.
  • the intake port 30 does not have to be provided on the outer periphery of the housing between the stator 21 and the partitioning wall 9 for cooling the inverter, an axial dimension therebetween may be reduced, and hence a reduction in size of the electric compressor 1 is achieved.
  • the clearances 41 when the stator core 24 is assembled to the housing 2 by press-fitting thereto, the deviation of stress distribution generated in the housing 2 can be alleviated, and even when the clearances 41 are provided, since the flow of the refrigerant to the clearances 41 is restrained by the second restraining mechanisms (the projecting ridges 43), the refrigerant introduced between the stator core 24 and the partitioning wall 9 is introduced to the gaps between the coils or the gap between the stator 21 and the rotor 22, and hence impairment of cooling of the stator 21 is avoided.
  • the first restraining mechanism is configured by bringing the end surface on the compressing mechanism side of the stator core 24 into abutment with the stepped portion 26 of the housing 2, and closing a compressor side opening end of a refrigerant introducing passage 31 with the stepped portion 26 has been described.
  • the compressor side opening end of the refrigerant introducing passage 31 does not necessarily have to be closed, and the first restraining mechanism may be configured by generating a state of resisting the flow of the refrigerant by bringing the stepped portion 26 into proximity to the compressor side opening end of the refrigerant introducing passage 31.
  • the first restraining mechanism may be configured by providing a projecting ridge 27 projecting from the inner wall of the housing 2 inward is provided to throttle or close the cross section of the passage at a portion of the fluid introducing passage 31 on the compressing mechanism side with respect to the intake port 30 as illustrated in Fig. 4(b) , or may be configured by throttling or closing the downstream side of the fluid introducing passage 31 by bringing a bobbin 28, which is provided at a coil end on the compressing mechanism side with respect to the fluid introducing passage 31 as illustrated in Fig. 4(c) , into proximity to or into abutment with the inner wall of the housing.
  • the inverter storage space 12b that houses the inverter board configured to control driving of the electric motor 4 may be provided along an outer peripheral wall of the housing 2.
  • the inverter storage space 12b is provided along the passage on the radial outside of the fluid introducing passage 31 (in the drawing, right above the fluid introducing passage 31).
  • the inverter can be cooled by the refrigerant flowing in the electric motor storage space 12a that houses the electric motor 4 (in particular, by the refrigerant flowing in the fluid introducing passage 31 between the housing 2 and the stator core 24).

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
EP13791594.8A 2012-05-18 2013-04-30 Electric compressor Active EP2873858B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012114708 2012-05-18
PCT/JP2013/062532 WO2013172189A1 (ja) 2012-05-18 2013-04-30 電動圧縮機

Publications (3)

Publication Number Publication Date
EP2873858A1 EP2873858A1 (en) 2015-05-20
EP2873858A4 EP2873858A4 (en) 2016-03-23
EP2873858B1 true EP2873858B1 (en) 2020-08-12

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ID=49583598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13791594.8A Active EP2873858B1 (en) 2012-05-18 2013-04-30 Electric compressor

Country Status (5)

Country Link
EP (1) EP2873858B1 (ja)
JP (1) JP6178309B2 (ja)
KR (1) KR20150017321A (ja)
CN (1) CN104302912B (ja)
WO (1) WO2013172189A1 (ja)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6402646B2 (ja) * 2015-02-19 2018-10-10 株式会社豊田自動織機 電動過給器
JP6545527B2 (ja) * 2015-05-19 2019-07-17 サンデン・オートモーティブコンポーネント株式会社 電動圧縮機
FR3065758B1 (fr) * 2017-04-27 2019-05-03 Valeo Japan Co., Ltd. Compresseur electrique
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EP2873858A4 (en) 2016-03-23
CN104302912B (zh) 2016-09-28
EP2873858A1 (en) 2015-05-20
WO2013172189A1 (ja) 2013-11-21
CN104302912A (zh) 2015-01-21
JP6178309B2 (ja) 2017-08-09
KR20150017321A (ko) 2015-02-16
JPWO2013172189A1 (ja) 2016-01-12

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