CN110319011B - Electric compressor - Google Patents

Electric compressor Download PDF

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Publication number
CN110319011B
CN110319011B CN201910241723.3A CN201910241723A CN110319011B CN 110319011 B CN110319011 B CN 110319011B CN 201910241723 A CN201910241723 A CN 201910241723A CN 110319011 B CN110319011 B CN 110319011B
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CN
China
Prior art keywords
top plate
rib
mounting leg
plate portion
housing
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Active
Application number
CN201910241723.3A
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Chinese (zh)
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CN110319011A (en
Inventor
山田哲也
矢野顺也
木下雄介
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Toyota Industries Corp
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Toyota Industries Corp
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Publication of CN110319011A publication Critical patent/CN110319011A/en
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    • 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
    • F04C23/02—Pumps characterised by combination with or adaptation to specific driving engines or motors
    • 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
    • F04B39/122—Cylinder block
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • 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
    • 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
    • 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
    • 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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2210/00—Fluid
    • F04C2210/26—Refrigerants with particular properties, e.g. HFC-134a
    • 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
    • F04C2240/805—Fastening means, e.g. bolts
    • 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
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2210/00—Working fluid
    • F05B2210/10—Kind or type
    • F05B2210/14—Refrigerants with particular properties, e.g. HFC-134a
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
    • F05B2260/00—Function
    • F05B2260/30—Retaining components in desired mutual position
    • F05B2260/301—Retaining bolts or nuts

Abstract

The invention provides an electric compressor which can restrain large-scale and improve heat radiation of a switch element. A1 st mounting leg portion (23) and a 2 nd mounting leg portion (24) are provided on an outer surface of a housing (11) of an electric compressor (10), and a 3 rd mounting leg portion (25) is provided on an outer surface (14e) of a top plate portion (14b) of a cover (14). The motor-driven compressor (10) has a 2 nd rib (42) extending from the outer surface of the 3 rd mounting leg portion (25) to the outer surface (14e) of the top plate portion (14 b). The switching elements are arranged in an element arrangement region (D) set on the substrate. When the top plate (14b) is viewed in plan, a part of the 2 nd rib (42) is disposed at a position overlapping the element disposition region (D).

Description

Electric compressor
Technical Field
The present invention relates to an electric compressor provided with a switching element.
Background
For example, as disclosed in patent document 1, an electric compressor includes a compression unit that compresses and discharges a refrigerant, an electric motor that drives the compression unit, and a motor drive circuit that drives the electric motor. The motor drive circuit is housed in a housing space defined (partitioned) by a cover attached to an outer surface of the housing and the outer surface of the housing. The motor drive circuit includes a plurality of switching elements mounted on a substrate. Then, the driving of the electric motor is controlled by converting a dc voltage from a battery (dc power supply) into an ac voltage by the switching operation of each switching element, and applying the ac voltage to the electric motor as a driving voltage.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2016-153606
Disclosure of Invention
Problems to be solved by the invention
In addition, the switching element generates heat by the switching operation. Further, if the amount of heat generated by the switching operation of the switching element increases and the temperature of the switching element exceeds the heat-resistant temperature of the switching element, the switching element may be damaged. In order to suppress the temperature rise of the switching element, for example, it is conceivable to increase the size of the cover defining the housing space or to increase the surface area of the cover.
The invention aims to provide an electric compressor which can inhibit the enlargement and improve the heat radiation of a switch element.
Means for solving the problems
The electric compressor for solving the above-described problems includes: a rotating shaft; an electric motor that rotates the rotating shaft; a compression unit that is driven by rotation of the rotary shaft to compress a refrigerant; a housing that houses the rotary shaft, the electric motor, and the compression unit; a substrate on which a switching element is mounted, the switching element converting a direct-current voltage into an alternating-current voltage and applying the alternating-current voltage to the electric motor; a cover which is mounted on an outer surface of the housing, forms a housing space for housing the substrate together with the housing, and has a top plate portion facing the substrate in parallel with a space therebetween; a mounting leg portion provided on an outer surface of the housing and an outer surface of the top plate portion and having a bolt insertion hole through which a bolt is inserted; and a rib extending from an outer surface of the mounting leg portion to an outer surface of the top plate portion along a 2 nd direction intersecting a 1 st direction in which the bolt insertion hole penetrates the mounting leg portion, wherein the switching element is disposed in an element disposition region set in the substrate, and the rib is disposed at a position at least partially overlapping the element disposition region when the top plate portion is viewed in plan.
Thus, heat generated by the switching operation of the switching element is transmitted to the top plate portion of the cover. Since the rib provided in the top plate overlaps the element arrangement region in which the switching element is arranged, the heat transmitted to the top plate can be efficiently transmitted to the rib, and can be released from the rib to the outside of the housing space. The ribs are provided to reinforce the mounting leg portions. Therefore, it is not necessary to increase the size of the cover defining the storage space, for example, in order to suppress the temperature increase of the switching element, and the heat dissipation performance of the switching element can be improved while suppressing the size increase of the electric compressor.
In addition, the electric compressor may be: the plurality of ribs are arranged in parallel at intervals along the 1 st direction, a region sandwiched by the ribs adjacent in the 1 st direction is formed in the top plate, and the ribs and the region sandwiched by the ribs face the element arrangement region in a plan view of the top plate.
Thus, heat generated by the opening and closing operation of the opening and closing element is transferred to the position of the top plate portion of the cover overlapping the rib and the region sandwiched by the rib. Further, the heat transferred to the top plate portion can be efficiently transferred from the top plate portion to the plurality of ribs, and the heat transferred to the top plate portion can be efficiently released to the outside of the housing space.
In addition, the electric compressor may be: the top plate portion has a recess recessed toward the bolt insertion hole.
Thus, heat generated by the switching operation of the switching element is transmitted from the inside of the recess to the mounting leg portion. Since the ribs are connected to the mounting leg portions, the heat transmitted to the mounting leg portions can be efficiently transmitted to the ribs and released from the ribs.
Effects of the invention
According to the present invention, heat dissipation of the switching element can be improved while suppressing an increase in size.
Drawings
Fig. 1 is a side sectional view of an electric compressor of the embodiment.
Fig. 2 is a front view showing a substrate of the motor drive circuit housed in the housing space and a component arrangement region.
Fig. 3 is a view of the top plate in plan view, showing the state of mounting the electric compressor according to the embodiment.
Fig. 4 is a partial perspective view showing a 3 rd mounting leg portion and a rib of the electric compressor of the embodiment.
Fig. 5 is a front view showing the cover from the inner surface side.
Description of the reference numerals
D … element arrangement region, S … housing space, B1, B2, B3 … bolt, Y1 … 1 st direction, Y2 … 2 nd direction, 10 … electric compressor, 11 … housing, 14 … cover, 14B … top plate, 14D … inner surface, 14e … outer surface, 16 … rotation shaft, 17 … compression portion, 18 … electric motor, 25 … 3 rd mounting leg, 25a … 3 rd bolt insertion hole, 26 … recess, 31 … substrate, 35 … switch element, 42 … nd 2 nd rib.
Detailed Description
Hereinafter, an embodiment in which the electric compressor is embodied will be described with reference to fig. 1 to 5.
As shown in fig. 1, a casing 11 of the electric compressor 10 includes a motor casing 12 having a bottomed tubular shape with an opening 12a formed at one end (left end in fig. 1), and a discharge casing 13 having a bottomed tubular shape coupled to one end of the motor casing 12. A bottomed cylindrical cover 14 having an opening 14a formed at one end (left end in fig. 1) is attached to the bottom wall 12b side of the motor case 12. The motor case 12, the discharge case 13, and the cover 14 are each made of die-cast aluminum alloy.
A discharge chamber S1 is defined between the motor housing 12 and the discharge housing 13. The motor housing 12 and the discharge housing 13 are fastened together by 4 bolts B1 (only 2 bolts B1 are illustrated in fig. 1), and the motor housing 12 and the cover 14 are fastened together by 6 bolts B2 (only 3 bolts B2 are illustrated in fig. 1). A gasket G1 is sandwiched between the motor case 12 and the discharge case 13, and a gasket G2 is sandwiched between the motor case 12 and the cover 14.
A discharge port 15 is formed in a bottom wall of the discharge casing 13, and an external refrigerant circuit, not shown, is connected to the discharge port 15. A suction port, not shown, is formed in the peripheral wall 12c of the motor case 12, and an external refrigerant circuit is connected to the suction port.
A rotary shaft 16 is housed in the motor case 12. Further, a compression unit 17 that compresses a refrigerant and an electric motor 18 that drives the compression unit 17 are housed in the motor case 12. The electric motor 18 drives the rotary shaft 16. The compression unit 17 is driven by the rotation of the rotary shaft 16. The electric motor 18 is disposed closer to the bottom wall 12b (right side in fig. 1) of the motor housing 12 than the compression portion 17.
A shaft support member 19 is provided between the compression portion 17 and the electric motor 18 in the motor housing 12. An insertion hole 19a through which one end of the rotary shaft 16 is inserted is formed in the center of the shaft support member 19. A radial bearing 16a is provided between the insertion hole 19a and one end of the rotary shaft 16. One end of the rotary shaft 16 is rotatably supported by a shaft support member 19 via a radial bearing 16 a.
A bearing portion 12d is recessed in the bottom wall 12b of the motor case 12. The other end of the rotating shaft 16 is inserted into the bearing 12 d. A radial bearing 16b is provided between the bearing portion 12d and the other end portion of the rotary shaft 16. The other end portion of the rotating shaft 16 is rotatably supported by the bearing portion 12d via a radial bearing 16 b.
The compression portion 17 includes a fixed scroll 17a fixed in the motor case 12 and a movable scroll 17b disposed to face the fixed scroll 17 a. A compression chamber S3 whose volume can be changed is partitioned between the fixed scroll 17a and the movable scroll 17 b. The refrigerant compressed by the change in the volume of the compression chamber S3 is discharged into the discharge chamber S1. The electric motor 18 includes a rotor 21 (rotor) that rotates integrally with the rotary shaft 16, and a stator 22 (stator) that is fixed to the inner circumferential surface of the motor housing 12 so as to surround the rotor 21.
As shown in fig. 1 or 3, the housing 11 of the electric compressor 10 is provided with 1 st to 3 rd mounting leg portions 23 to 25 for mounting the electric compressor 10 to an engine E (an object to be mounted). A tubular 1 st mounting leg portion 23 elongated in the radial direction of the rotary shaft 16 is integrally formed on the upper outer surface of the peripheral wall 12c of the motor housing 12, and a 1 st bolt insertion hole 23a extending in the radial direction of the rotary shaft 16 is formed in the 1 st mounting leg portion 23. Further, a 2 nd mounting leg portion 24, which is cylindrical and elongated in the radial direction of the rotary shaft 16, is integrally formed on the lower outer surface of the peripheral wall 12c of the motor housing 12, and a 2 nd bolt insertion hole 24a, which extends in the radial direction of the rotary shaft 16, is formed in the 2 nd mounting leg portion 24.
Further, a cylindrical 3 rd mounting leg portion 25 elongated in the radial direction of the rotary shaft 16 is integrally formed with the cover 14. The 3 rd mounting leg portion 25 includes a 1 st cylindrical portion 251 at one end side in the longitudinal direction and a 2 nd cylindrical portion 252 at the other end side in the longitudinal direction. The 3 rd mounting leg portion 25 includes a thinned portion 253 between the 1 st cylindrical portion 251 and the 2 nd cylindrical portion 252 along the longitudinal direction. The 3 rd mounting leg portion 25 is formed with a 3 rd bolt insertion hole 25a penetrating the 1 st cylindrical portion 251 and the 2 nd cylindrical portion 252.
Further, the electric compressor 10 is mounted to the side surface of the engine E by fastening a bolt B3 as a fastening member to the 1 st boss E1 of the engine E from the 1 st mounting leg 23, fastening a bolt B3 as a fastening member to the 2 nd boss E2 of the engine E from the 2 nd mounting leg 24, and fastening a bolt B3 as a fastening member to the 3 rd boss E3 of the engine E from the 3 rd mounting leg 25.
As shown in fig. 1, in the electric compressor 10, a tubular annular wall portion 12e protruding toward the cover 14 is provided on the bottom wall 12b side of the motor housing 12. A plurality of substrate support portions 12f protruding toward the cover 14 are provided on the bottom wall 12b of the motor case 12, and the motor drive circuit 30 is supported by the substrate support portions 12 f.
The cover 14 includes a substantially disk-shaped top plate 14b and a cylindrical peripheral wall 14c projecting from the top plate 14b toward the motor case 12. A gasket G2 is interposed between the peripheral wall 14c and the annular wall 12e of the motor case 12. The housing space S is defined by the bottom wall 12b, the annular wall 12e, the peripheral wall 14c of the cover 14, and the top plate 14b of the motor case 12.
A motor drive circuit 30 for driving the electric motor 18 is housed in the housing space S. The motor drive circuit 30 includes an inverter, and supplies electric power from a not-shown power source to the stator 22 of the electric motor 18 based on a command from a not-shown air conditioning ECU.
As shown in fig. 2, the motor drive circuit 30 includes a flat plate-like substrate 31 housed inside the annular wall portion 12e, and various electric components 34 mounted on the substrate 31. The substrate 31 is disposed inside the annular wall 12e in a state separated from the bottom wall 12b by the substrate support portion 12 f. The electric component 34 is a well-known component constituting an inverter, that is, a switching element, an electrolytic capacitor, a transformer, a driver, a fixed resistance, and the like. One switching element 35 in the electric component 34 converts a direct-current voltage from a power supply into an alternating-current voltage and applies the alternating-current voltage to the electric motor 18. The switching element 35 is mounted substantially in the center of the substrate 31.
As shown by the two-dot chain line in fig. 2, an element arrangement region D for arranging the switching element 35 is set in the substrate 31. The element arrangement region D is a region surrounded by an outline of the switching element substrate, not shown. The element arrangement region D is set substantially at the center of the substrate 31 and has a substantially rectangular shape. Further, arrangement areas F for arranging other electrical components 34 are set in advance in the substrate 31, and the other electrical components 34 are mounted in each of the arrangement areas F.
As shown in fig. 1, the top plate portion 14b of the cover 14 has an inner surface 14d facing the housing space S and an outer surface 14e parallel to the inner surface 14d and facing the outside of the motor-driven compressor 10. In the cover 14, the inner surface 14d of the top plate 14b faces the substrate 31 at a distance in parallel. The inner surface 14d of the top plate 14b and the substrate 31 are provided so as to be perpendicular to the axis of the rotary shaft 16.
The direction connecting the inner surface 14d and the outer surface 14e of the top plate 14b is defined as the thickness direction of the top plate 14 b. In the 3 rd mounting leg portion 25, a direction in which the 3 rd bolt insertion hole 25a penetrates is defined as the 1 st direction Y1, and a direction intersecting the 1 st direction Y1 is defined as the 2 nd direction Y2. In the present embodiment, the 2 nd direction Y2 is orthogonal to the 1 st direction Y1 and coincides with the radial direction of the 3 rd bolt insertion hole 25 a.
As shown in fig. 3 or 4, the 1 st rib 41 is provided on the outer surface 14e of the top plate portion 14b of the cover 14 so as to sandwich the 3 rd mounting leg portion 25 in the 2 nd direction Y2. Each of the 1 st ribs 41 is provided on the outer surface 14e so that the length (long side) thereof extends in the 1 st direction Y1. Each 1 st rib 41 is provided at a position apart from the 3 rd mounting leg portion 25 in the 2 nd direction Y2. In the present embodiment, the upper 1 st rib 41 of the pair of 1 st ribs 41 is provided at a position closer to the 3 rd mounting leg portion 25 than the lower 1 st rib 41.
Each 1 st rib 41 and the 3 rd mounting leg 25 are parallel to each other. In each of the 1 st ribs 41, a front end in a protruding direction protruding from the outer surface 14e of the top plate portion 14b is a protruding end 41 a. In the 3 rd mounting leg portion 25, a front end in a protruding direction protruding from the outer surface 14e of the top plate portion 14b is set as a protruding end 25 b. A dimension H1 from the outer surface 14e of the top plate portion 14b to the projecting end 41a of the 1 st rib 41 is smaller than a dimension H2 from the outer surface 14e of the top plate portion 14b to the projecting end 25b of the 3 rd mounting leg portion 25.
A plurality of 2 nd ribs 42 are provided on the outer surface 14e of the top plate portion 14b of the cover 14 so as to span between the 3 rd mounting leg portion 25 and each 1 st rib 41. Each 2 nd rib 42 extends from the outer surface of the 3 rd mounting leg portion 25 to the outer surface 14e of the top plate portion 14 b. The 2 nd rib 42 is provided on the side surfaces of the 1 st rib 41 and the 3 rd mounting leg 25 facing each other in the 2 nd direction Y2, and connects the 1 st rib 41 and the 3 rd mounting leg 25. The 2 nd rib 42 is inclined from the projecting end 41a of the 1 st rib 41 toward the projecting end 25b of the 3 rd mounting leg 25. The plurality of 2 nd ribs 42 are arranged such that the 2 nd ribs 42 adjacent in the 1 st direction Y1 are spaced apart from each other.
The 2 nd rib 42 extending from the 3 rd mounting leg 25 toward the 1 st rib 41 on one side (upper side) and the 2 nd rib 42 extending from the 3 rd mounting leg 25 toward the 1 st rib 41 on the other side (lower side) are different in size in the 2 nd direction Y2. In the present embodiment, the 2 nd rib 42 extending from the 3 rd mounting leg 25 toward the 1 st rib 41 on the upper side is shorter than the 2 nd rib 42 extending from the 3 rd mounting leg 25 toward the 1 st rib 41 on the lower side.
As shown in fig. 5, a recess 26 is provided in the top plate portion 14b of the cover 14, and the recess 26 is recessed from the inner surface 14d toward the 3 rd bolt insertion hole 25a of the 3 rd mounting leg portion 25 in the thickness direction. The portion of the concave portion 26 that is recessed toward the 1 st cylindrical portion 251 and the 2 nd cylindrical portion 252 is recessed deeper than the portion that is recessed toward the reduced thickness portion 253.
As shown in fig. 3, when the top plate portion 14b is viewed in plan, a region of a quadrangular shape in which the pair of 1 st ribs 41 are both end edges in the 2 nd direction Y2, and an imaginary line L connecting one longitudinal end and the other longitudinal end of the pair of 1 st ribs 41 in the 2 nd direction Y2 is both end edges in the 1 st direction Y1 is defined as a rib arrangement region R. The rib arrangement region R further includes an inter-rib region Ra between the 2 nd ribs 42 adjacent in the 1 st direction Y1. Further, the 1 st rib 41 and the 2 nd rib 42 are arranged in the rib arrangement region R.
When the top plate portion 14b is viewed in plan, a part of the rib arrangement region R overlaps the element arrangement region D of the motor drive circuit 30. Therefore, of the 1 st and 2 nd ribs 41 and 42 arranged in the rib arrangement region R, a part of the 1 st rib 41 located on the upper side near the central portion of the top plate portion 14b and a part of the 2 nd ribs 42 located near the 2 nd cylindrical portion 252 of the 2 nd ribs 42 on the upper side overlap the element arrangement region D and overlap the switching element 35.
Therefore, of the inner surface 14d of the top plate portion 14b, a portion provided with the 1 st rib 41 located on the upper side near the central portion of the top plate portion 14b and a portion provided with the plurality of 2 nd ribs 42 close to the 2 nd cylindrical portion 252 of the 2 nd rib 42 on the upper side face a part of the switching element 35. Further, a portion of the recess 26 recessed toward the 3 rd bolt insertion hole 25a located in the 2 nd cylindrical portion 252 also overlaps the switching element 35. Since the recessed portion 26 is recessed toward the 3 rd bolt insertion hole 25a of the 3 rd mounting leg portion 25 disposed in the rib disposition region R, the recessed portion 26 is disposed in the rib disposition region R.
According to the above embodiment, the following operational effects can be obtained.
(1) When the top plate 14b is viewed in plan, a part of the 2 nd rib 42 overlaps the element disposition region D of the substrate 31. Further, the surface area of the cover 14 can be enlarged by the 2 nd rib 42, and heat generated by the opening and closing operation of the switching element 35 can be efficiently released from the cover 14 to the outside of the housing space S. The 2 nd rib 42 is provided to reinforce the 3 rd mounting leg portion 25. Therefore, unlike the case where the surface area of the cover 14 is increased by, for example, increasing the size of the cover 14 defining the housing space S in order to suppress the temperature rise of the switching element 35, and thereby improve the heat radiation performance, the heat radiation performance of the switching element 35 can be improved while suppressing the increase in the size of the cover 14 and the electric compressor 10.
(2) When the top plate portion 14b is viewed in plan, the plurality of 2 nd ribs 42 and a part of the inter-rib region Ra overlap the element disposition region D of the substrate 31. Therefore, the surface area of the top plate portion 14b can be further enlarged by the plurality of 2 nd ribs 42, and heat generated by the opening and closing operation of the opening and closing element 35 can be efficiently released from the cover 14 to the outside of the housing space S.
(3) The 2 nd rib 42 is coupled to the outer surface of the 3 rd mounting leg 25, and a recess 26 recessed toward the 3 rd bolt insertion hole 25a of the 3 rd mounting leg 25 is provided in the top plate portion 14 b. Accordingly, heat generated by the switching operation of the switching element 35 can be transmitted from the inside of the recess 26 to the 3 rd mounting leg portion 25, and can be transmitted from the 3 rd mounting leg portion 25 to the 2 nd rib 42. Therefore, the heat generated by the opening and closing operation of the switching element 35 can be efficiently released from the cover 14 to the outside of the housing space S by the 2 nd rib 42 and the concave portion 26 provided in the cover 14.
(4) A portion of the recess 26 recessed toward the 3 rd bolt insertion hole 25a located at the 2 nd cylindrical portion 252 is recessed deeper than a portion recessed toward the reduced thickness portion 253. Since the portion recessed toward the 3 rd bolt insertion hole 25a located in the 2 nd cylindrical portion 252 overlaps the element disposition region D, heat generated by the switching element 35 can be efficiently released to the recessed portion 26.
(5) The motor-driven compressor 10 is attached to the engine E by fastening the fastening bolts B3 to the 1 st to 3 rd bosses E1 to E3 of the engine E from the 1 st to 3 rd mounting leg portions 23 to 25. The 3 rd mounting leg portion 25 is provided on the top plate portion 14b of the cover 14, and the top plate portion 14b is plate-shaped. Therefore, when the bolt B3 inserted through the 3 rd bolt insertion hole 25a of the 3 rd mounting leg portion 25 is fastened to the 3 rd boss portion E3, the top plate portion 14B is easily deflected by the axial force, but the deflection of the top plate portion 14B can be suppressed by the 1 st rib 41 and the 2 nd rib 42, and the state in which the housing space S is sealed by the gasket G2 can be maintained.
(6) The electric compressor 10 includes the 1 st rib 41 coupled to the 2 nd rib 42 in addition to the 2 nd rib 42 coupled to the 3 rd mounting leg portion 25. Therefore, the surface area of the cover 14 can be enlarged by the 1 st rib 41 and the 2 nd rib 42, and heat generated by the opening and closing operation of the switching element 35 can be efficiently released from the cover 14 to the outside of the housing space S.
(7) The dimension H1 of the 1 st rib 41 is smaller than the dimension H2 of the 3 rd mounting leg 25. The 2 nd rib 42 has a shape extending obliquely from the projecting end 41a of the 1 st rib 41 toward the projecting end 25b of the 3 rd mounting leg 25. Therefore, the surface area of the 2 nd rib 42 can be increased, and the heat radiation performance of the 2 nd rib 42 can be improved.
The above embodiment may be modified as follows.
The 2 nd ribs 42 may be provided one each so as to sandwich the 3 rd mounting leg portion 25 in the 2 nd direction Y2, as long as they overlap the element arrangement region D. The 2 nd rib 42 may be provided only on one side of the position sandwiching the 3 rd mounting leg portion 25 in the 2 nd direction Y2.
When the top plate portion 14b is viewed in plan, the 2 nd rib 42 may be provided such that the entire 2 nd rib 42 overlaps the element disposition region D.
The number of the 2 nd ribs 42 may also be changed as appropriate.
The interval between the 2 nd ribs 42 adjacent to each other in the 1 st direction Y1 may be changed as appropriate.
The 2 nd rib 42 extending from the 3 rd mounting leg 25 toward the 1 st rib 41 on the upper side and the 2 nd rib 42 extending from the 3 rd mounting leg 25 toward the 1 st rib 41 on the lower side may be the same in size in the 2 nd direction Y2.
The angle at which the 2 nd rib 42 intersects the 1 st direction Y1 of the 3 rd mounting leg 25 may also be changed as appropriate.
The 1 st rib 41 may not be provided.
The recess 26 recessed from the inner surface 14d of the top plate 14b may be absent.
The depth of the recess 26 may be the same at any position.
The thinned-out portion 253 of the 3 rd mounting leg portion 25 may not be present.
The cover 14 may be configured to include only the top plate 14b without the peripheral wall 14 c.
The compression portion 17 is not limited to the type formed by the fixed scroll 17a and the movable scroll 17b, and may be changed to, for example, a piston type, a vane type, or the like.
Mounting legs may also be provided on the housing 11.
The electric compressor 10 may be mounted by fastening bolts B3 inserted through the 1 st to 3 rd bolt insertion holes 23a to 25a of the 1 st to 3 rd mounting leg portions 23 to 25 to members constituting an engine room other than the engine E.

Claims (3)

1. An electric compressor, comprising:
a rotating shaft;
an electric motor that rotates the rotating shaft;
a compression unit that is driven by rotation of the rotary shaft to compress a refrigerant;
a housing that houses the rotary shaft, the electric motor, and the compression unit;
a substrate on which a switching element is mounted, the switching element converting a direct-current voltage into an alternating-current voltage and applying the alternating-current voltage to the electric motor;
a cover which is attached to an outer surface of the housing, forms a housing space for housing the substrate together with the housing, and has a top plate portion facing the substrate at a distance in parallel;
a mounting leg portion provided on an outer surface of the housing and an outer surface of the top plate portion and having a bolt insertion hole through which a bolt is inserted; and
a rib, comprising: a 1 st rib extending in a 1 st direction along the bolt insertion hole and penetrating the mounting leg portion provided on the outer surface of the top plate portion, and a 2 nd rib extending in a 2 nd direction intersecting the 1 st direction from the outer surface of the mounting leg portion provided on the outer surface of the top plate portion to the outer surface of the top plate portion and connecting the 1 st rib and the mounting leg portion provided on the outer surface of the top plate portion,
the switching element is disposed in an element disposition region set on the substrate,
the 2 nd rib is arranged at a position at least partially overlapping the element arrangement region when the top plate portion is viewed in plan,
the 2 nd rib is inclined from a protruding end of the 1 st rib toward the mounting leg portion provided to the outer surface of the top plate portion,
a dimension from an outer surface of the top plate portion to a protruding end of the 1 st rib is smaller than a dimension from the outer surface of the top plate portion to a protruding end of the mounting leg portion provided to the outer surface of the top plate portion.
2. The motor-driven compressor according to claim 1,
the 2 nd rib is provided in plurality at intervals in the 1 st direction, a region sandwiched by the 2 nd ribs adjacent in the 1 st direction is formed in the top plate, and the 2 nd rib and the region sandwiched by the 2 nd ribs face the element arrangement region in a plan view of the top plate.
3. Motor compressor according to claim 1 or 2,
the top plate portion has a recess recessed toward the bolt insertion hole.
CN201910241723.3A 2018-03-30 2019-03-28 Electric compressor Active CN110319011B (en)

Applications Claiming Priority (2)

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JP2016118108A (en) * 2014-12-18 2016-06-30 パナソニックＩｐマネジメント株式会社 Motor compressor

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KR102191953B1 (en) 2020-12-16
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DE102019203806A1 (en) 2019-10-02
CN110319011A (en) 2019-10-11
KR20190114851A (en) 2019-10-10

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