JP6723027B2 - Electric compressor - Google Patents

Description

The present invention relates to an electric compressor (inverter-integrated electric compressor) that is used for compressing a fluid such as a refrigerant and integrally includes a motor drive circuit (inverter), and particularly has a compression mechanism, an electric motor, and a motor drive circuit inside. The present invention relates to an electric compressor having a housing that houses it.

As this type of electric compressor, for example, the electric compressor described in Patent Document 1 is known. The electric compressor described in Patent Document 1 converts DC electric power from a battery into three-phase AC electric power by an inverter and supplies electric power to an electric motor for driving a compression mechanism, and has the inverter built therein. Specifically, the inside of the housing of this electric compressor is divided by a partition wall into a first space that houses the compression mechanism and the electric motor and a second space that houses the inverter. Further, the drive shaft of the electric motor extends in the extending direction of the housing in the first space within the housing, one end of which is supported by a support portion projecting from the center of the partition wall portion, and the other end of which is a compression mechanism. Is linked to.

Japanese Unexamined Patent Publication No. 2010-275951

By the way, this type of electric compressor may be used, for example, by being incorporated in a refrigerant circuit of a vehicle air conditioner, and it is required to reduce its weight from the viewpoint of workability at the time of assembly to the vehicle air conditioner. ing. For this weight reduction, for example, an aluminum-based material is often used as the housing material in many cases.
However, in the electric compressor described in Patent Document 1, a partition wall that forms a part of the housing has a support portion that supports one end of the drive shaft of the electric motor. Therefore, the partition wall portion is required to have an appropriate strength to function as a pressure partition wall in the housing as a pressure container and to stably support the drive shaft during driving of the electric motor.

The present invention has been made in view of such an actual situation, and an object thereof is to provide an electric compressor capable of maintaining necessary strength while reducing the weight of a partition wall portion.

An electric compressor according to one aspect of the present invention includes, in a housing, a compression mechanism that compresses a fluid, an electric motor that drives the compression mechanism, and a motor drive circuit that controls voltage application to the electric motor. An inner space of the housing accommodates the first space for accommodating the compression mechanism and the electric motor and the motor drive circuit by a partition wall having a supporting portion for supporting one end of the drive shaft of the electric motor. An electric compressor partitioned into a second space, wherein the partition wall portion has a triangular prism shape toward the second space, in a region of the first space side wall surface surrounding the support portion. It has a plurality of concave portions that are recessed, and the plurality of concave portions are arranged such that one side portion of the triangular bottom portion thereof is separated from and parallel to the one side portion of the adjacent concave portion.

In the electric compressor according to the one aspect, a plurality of recessed portions that are recessed in a triangular prism shape toward the second space side are formed in a region surrounding the support portion of the first space side wall surface of the partition wall portion, and each recessed portion includes: The one side portion of the triangular bottom portion is spaced apart from and parallel to the one side portion of the adjacent recess. By arranging the plurality of recesses in the partition wall in this way, the portion of the partition wall between the recesses becomes a rib of a truss structure whose basic unit is a triangular framework. Therefore, according to the electric compressor of the one aspect, the rib having the truss structure can be formed in the partition wall so as to surround the support. As a result, for example, in order to reduce the weight, even if an aluminum-based material is used as the material of the partition wall portion that is a part of the housing, the rib of the truss structure keeps the strength of the partition wall portion at the required strength. You can

In this way, it is possible to provide an electric compressor capable of holding the required strength while reducing the weight of the partition wall portion.

It is a schematic sectional drawing of the electric compressor by one embodiment of the present invention. It is a front view of the partition wall part of the said electric compressor. It is a figure for demonstrating the position of the opening end of the suction passage of the said electric compressor. It is an enlarged view of the B section shown in FIG. It is a principal part perspective view of the electric compressor shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 is a schematic sectional view of an electric compressor according to an embodiment of the present invention.
The electric compressor 100 according to the present embodiment is incorporated in, for example, a refrigerant circuit of a vehicle air conditioner, and compresses and discharges a refrigerant (fluid) sucked from a low pressure side of the refrigerant circuit. The electric compressor 100 is a so-called inverter-integrated electric compressor, and includes a scroll unit 1 as a compression mechanism that compresses a refrigerant, a housing 10, an electric motor 20 that drives the scroll unit 1, and a motor drive circuit. The inverter 30 of FIG. In the present embodiment, the case where the compression mechanism is a scroll type compression mechanism will be described as an example.

The scroll unit 1 has a fixed scroll 2 and a movable scroll 3 which are meshed with each other. The fixed scroll 2 is formed by integrally forming a spiral wrap 2b on a disc-shaped bottom plate 2a. The movable scroll 3 is formed by integrally forming a spiral wrap 3b on a disc-shaped bottom plate 3a.

The scrolls 2 and 3 are arranged so that the spiral wraps 2b and 3b are meshed with each other. Specifically, both scrolls 2 and 3 have a predetermined gap between the end of the fixed scroll 2 on the protruding side of the spiral wrap 2b and the bottom plate 3a of the movable scroll 3, and the scroll wrap 3b of the movable scroll 3 protrudes. The side edge is arranged so as to have a predetermined gap with the bottom plate 2a of the fixed scroll 2. Although illustration is omitted, tip seals are provided at the projecting end edges of both spiral wraps 2b and 3b so as to fill the gap.

Further, the scrolls 2 and 3 are arranged such that the side walls of the spiral wraps 2b and 3b are partially in contact with each other in a state where the angles of the spiral wraps 2b and 3b in the circumferential direction are deviated from each other. As a result, a crescent-shaped closed space (compression chamber) is formed between the spiral wraps 2b and 3b.

The fixed scroll 2 is fixed to a rear housing 12 of the housing 10, which will be described later, and has a groove portion 2a1 that is open to the rear housing 12 side in the radial center thereof. Specifically, the groove 2a1 is formed on the back surface of the bottom plate 2a (that is, the end surface on the opposite side of the movable scroll 3). The fixed scroll 2 is integrally fastened to a rear housing 12 and a bearing holding portion 24, which will be described later, by an appropriate fastening means such as a bolt.

The movable scroll 3 is configured to be capable of revolving orbiting around the axis of the fixed scroll 2 via a crank mechanism described later in a state where its rotation is blocked. As a result, the scroll unit 1 moves the sealed space formed between the scrolls 2 and 3, more specifically, between the spiral wraps 2b and 3b, to the central portion and gradually reduces the volume thereof. As a result, the scroll unit 1 compresses the refrigerant flowing into the closed space from the outer end side of the spiral wraps 2b and 3b in the closed space.

As shown in FIG. 1, the housing 10 mainly includes a front housing 11 that houses the scroll unit 1, the electric motor 20, and an inverter 30 inside thereof, a rear housing 12, and an inverter cover 13. Have. Then, these (11, 12, 13) are integrally fastened by fastening means such as bolts 14 to form the housing 10 as the pressure vessel of the electric compressor 100. In the present embodiment, at least the partition wall portion 11b of the housing 10 will be described below as being made of an aluminum-based material, but the present invention is not limited to this, and an appropriate material can be used.

The front housing 11 has a substantially annular peripheral wall portion 11a and a partition wall portion 11b that functions as a pressure partition wall. The inner space of the front housing 11 is partitioned by the partition wall portion 11b into a first space S1 that mainly houses the scroll unit 1 and the electric motor 20, and a second space S2 that houses the inverter 30.

An opening on one end side (upper side in FIG. 1) of the peripheral wall portion 11 a is closed by the rear housing 12. The opening on the other end side (lower side in FIG. 1) of the peripheral wall portion 11a is closed by the inverter cover 13. The first wall S1 side of the peripheral wall portion 11a is formed into a cylindrical shape, and the second space S2 side of the peripheral wall portion 11a is formed into, for example, a box shape according to the shape of the inverter 30.

The partition wall portion 11b has a support portion 11b1 for supporting one end portion (lower end portion in FIG. 1) of the drive shaft 21 of the electric motor 20. In the present embodiment, the support portion 11b1 is provided at the radial center of the partition wall portion 11b in a cylindrical shape from the first space side wall surface W1 of the partition wall portion 11b toward the electric motor 20 side. The bearing 15 is fitted in the support portion 11b1. The support portion 11b1 supports one end portion of the drive shaft 21 of the electric motor 20 via the bearing 15. The structure of the partition wall portion 11b will be described in detail later.

Further, a refrigerant suction passage (suction port) P1 is formed in the peripheral wall portion 11a. The suction passage P1 is formed so as to penetrate the peripheral wall portion 11a of the front housing 11 and guides the refrigerant into the first space S1. Specifically, the refrigerant from the low pressure side of the refrigerant circuit is sucked into the first space S1 of the front housing 11 through the suction passage P1. Therefore, the first space S1 functions as the suction chamber H1. The electric motor 20 is cooled by circulating the refrigerant around the electric motor 20 in the suction chamber H1. In FIG. 1, the space above the electric motor 20 communicates with the space below the electric motor 20, and together with the space below the electric motor 20 constitutes one suction chamber H1. The extending direction and the opening position of the suction passage P1 will be described in detail later.

The rear housing 12 is formed in a disk shape, and its peripheral portion is fastened to one end side end portion (upper end portion in FIG. 1) of the peripheral wall portion 11a by a fastening means such as an appropriate number of bolts 14 or the like, so that the front housing 11 Close the opening at one end.

Further, a peripheral edge portion (in other words, a portion surrounding the groove portion 2a1) of the back surface of the bottom plate 2a of the fixed scroll 2 is in contact with one end surface of the rear housing 12. A refrigerant discharge chamber H2 is defined by the one end surface of the rear housing 12 and the groove portion 2a1 of the bottom plate 2a. A discharge hole 2a2 for compressed refrigerant is formed in the center of the bottom plate 2a. A one-way valve (a check valve that restricts the flow from the discharge chamber H2 to the scroll unit 1 side) 16 is provided in the discharge chamber H2 so as to cover the opening of the discharge hole 2a2. The refrigerant compressed in the closed space formed between the spiral wraps 2b and 3b is discharged into the discharge chamber H2 through the discharge hole 2a2 and the one-way valve 16. The compressed refrigerant in the discharge chamber H2 is discharged to the high pressure side of the refrigerant circuit via the discharge passage 12a formed in the rear housing 12 and the discharge port P2.

The electric motor 20 is configured to include a drive shaft 21, a rotor 22, and a stator core unit 23 arranged radially outside the rotor 22. For example, a three-phase AC motor is applied.

The drive shaft 21 is connected to the movable scroll 3 via a crank mechanism, and transmits the rotational force of the electric motor 20 to the movable scroll 3. One end portion (end portion on the inverter 30 side) of the drive shaft 21 is rotatably supported by the bearing 15 fitted in the support portion 11b1. A bearing holder 24 for supporting the other end of the drive shaft 21 (that is, the end on the movable scroll 3 side) is provided between the electric motor 20 and the scroll unit 1. The other end of the drive shaft 21 is rotatably supported by the bearing 17 through a through hole formed in the bearing holder 24.

The rotor 22 is rotatably supported inside the stator core unit 23 in the radial direction via a drive shaft 21 that is fitted (for example, press-fitted) into a shaft hole formed in the radial center of the rotor 22. When a magnetic field is generated in the stator core unit 23 by the power supplied from the inverter 30, a rotational force acts on the rotor 22 and the drive shaft 21 is rotationally driven.

The bearing holder 24 holds a bearing 17 that rotatably supports the end of the drive shaft 21 on the movable scroll 3 side. The bearing holding portion 24 is, for example, formed in a bottomed tubular shape, and has a cylindrical portion 24a and a bottom wall portion 24b. The cylindrical portion 24a is expanded so that the inner diameter on the opening side is larger than the inner diameter on the bottom wall portion 24b side, and has a shoulder portion 24a3 connecting the large diameter portion 24a1 and the small diameter portion 24a2. The movable scroll 3 is housed in a space defined by the large diameter portion 24a1 and the shoulder portion 24a3. The opening side end of the cylindrical portion 24a is brought into contact with the peripheral edge of the movable scroll 3 side end surface of the bottom plate 2a. The bearing 17 is fitted in the small diameter portion 24a2 of the cylindrical portion 24a. Then, a through hole for inserting the end portion of the drive shaft 21 on the movable scroll 3 side is opened at the radial center portion of the bottom wall portion 24b.

An annular thrust plate 18 is arranged between the shoulder portion 24 a 3 of the bearing holding portion 24 and the bottom plate 3 a of the movable scroll 3. The shoulder portion 24a3 receives the thrust force from the movable scroll 3 via the thrust plate 18. Sealing members 19 are arranged at the portions of the shoulder portion 24a3 and the bottom plate 3a that contact the thrust plate 18, respectively. Although not shown, the bearing holding portion 24 has a refrigerant introduction passage for introducing the refrigerant from the suction chamber H1 into the space H4 near the outer ends of the spiral wraps 2b and 3b of the scroll unit 1. Since this refrigerant introduction passage communicates between the space H4 and the suction chamber H1, the pressure in the space H4 is equal to the pressure in the suction chamber H1 (pressure in the suction chamber).

In the present embodiment, the crank mechanism is eccentrically attached to a cylindrical boss portion 25 formed on the rear surface of the bottom plate 3a and a crank 26 provided at the end of the drive shaft 21 on the movable scroll 3 side in an eccentric state. The bush 27 and the slide bearing 28 fitted to the boss portion 25 are included. The eccentric bush 27 is rotatably supported in the boss portion 25 via a slide bearing 28. A balancer weight 29 is attached to the end of the drive shaft 21 on the side of the movable scroll 3 so as to face the centrifugal force of the movable scroll 3 during operation. Although not shown, a rotation prevention mechanism for preventing rotation of the movable scroll 3 is appropriately provided. As a result, the movable scroll 3 is configured to be capable of revolving orbiting around the axis of the fixed scroll 2 via the crank mechanism in a state where its rotation is blocked. The electric compressor 100 drives the electric motor 20 to cause the movable scroll 3 to revolve around the axis of the fixed scroll 2 to compress the refrigerant flowing into the sealed space between the scrolls 2 and 3.

The inverter 30 controls the voltage application to the electric motor 20, and is accommodated in the second space S2 in the front housing 11. Although not shown, the inverter 30 includes a plurality of power switching elements for controlling voltage application to the electric motor 20, and converts DC power from an external power source such as a vehicle battery into three-phase AC power to drive the electric motor. It is configured to power 20. Specifically, the AC power from the inverter 30 is supplied to the electric motor 20 via the sealed terminal 31 and the lead wire 32 connected to the sealed terminal 31. The sealed terminal 31 penetrates the partition wall portion 11b in a gas-liquid tight manner.

Here, since the power switching element is an element that easily generates heat and its temperature rises, it is necessary to suppress the temperature rise. In this respect, the refrigerant is supplied to the first space S1 in the front housing 11 through the suction passage P1, and the electric motor 20 is cooled by this refrigerant and the partition wall portion 11b is also cooled. Therefore, the plurality of power switching elements are arranged so as to contact the second space side wall surface W2 of the partition wall portion 11b. Specifically, among the components of the inverter 30, the power switching element, which is the main component that easily generates heat, is the portion of the second space side wall surface W2 of the partition wall portion 11b that corresponds to the drive shaft 21 of the electric motor 20. It is placed in a certain area that is avoided. As a result, the temperature rise of the power switching elements and the like that easily generate heat among the components of the inverter 30 is effectively suppressed. In the present embodiment, the power switching element is assumed to be arranged centering on a portion of the second space side wall surface W2 that corresponds to a main recess 11c3 described later.

Next, the structure of the partition wall portion 11b, the extending direction and the opening position of the suction passage P1 in the present embodiment will be described in detail with reference to FIGS.
FIG. 2 is a front view of the partition wall portion 11b viewed from the AA arrow position shown in FIG. FIG. 3 is a view for explaining the position of the open end of the suction passage P1, and is a partial cut view in which the suction passage P1 portion in the front housing 11 shown in FIG. 2 is partially cut. FIG. 4 is an enlarged view of part B shown in FIG. 3, and FIG. 5 is a perspective view of a main part of the electric compressor 100 shown in FIG. 3 viewed from another angle. The sectional portion of the partition wall portion 11b in the vertical sectional view shown in FIG. 1 is also a sectional view taken along the line CC in FIGS. 2 and 3. 2 to 5, the bearing 15, the drive shaft 21, the sealed terminal 31, and the lead wire 32 shown in FIG. 1 are omitted for simplification of the drawings. Further, since the horizontal sectional position of the peripheral wall portion 11a shown in FIG. 2 and the horizontal sectional position of the peripheral wall portion 11a shown in FIGS. 3 to 5 are different, the shape of the outer peripheral surface is different.

First, the structure of the partition wall portion 11b will be described.
A plurality of partition wall portions 11b are respectively recessed in a triangular prism shape toward the second space S2 side in a region surrounding the support portion 11b1 of the first space side wall surface W1 (7 in FIG. 2, FIG. 3, and FIG. 5). There are, for example, a concave portion 11c for each lead wire and a concave portion 11d for lead wire wiring which has a substantially elliptical cross section and is concave according to the number of the lead wires 32. As shown in an enlarged scale in FIG. 4, each concave portion 11c is arranged such that one side portion 11e1 of the triangular bottom portion 11e is separated from and parallel to one side portion 11e1 of the triangular bottom portion 11e in the adjacent concave portion 11c. Is located in. A portion of the partition wall portion 11b between the concave portions 11c forms a partition wall 11f between the concave portions 11c. The partition wall 11f extends so as to connect the support portion 11b1 and the peripheral wall portion 11a. By arranging the plurality of recesses 11c in the partition wall 11b in this manner, the portions of the partition wall 11b between the recesses 11c become ribs of a truss structure whose basic unit is a triangular framework. That is, the rib of the truss structure is formed so as to be continuous with the support portion 11b1 of the partition wall portion 11b and surround the support portion 11b1.

In addition, in the present embodiment, a part (three in FIGS. 2, 3, and 5) of the plurality of concave portions 11c is formed such that one side portion 11e1 of the triangular bottom portion 11e extends along the outer periphery of the support portion 11b1. Will be placed. Specifically, the recesses 11c (hereinafter, referred to as main recesses 11c1, 11c2, 11c3) arranged along the outer periphery of the support 11b1 are arranged at an angular pitch of about 72° around the support 11b1, for example. At the same time, a corner portion of the support portion 11b1 facing the one side portion 11e1 is formed so as to reach the inner wall surface W3 of the peripheral wall portion 11a. The lead wire wiring recessed portion 11d is provided between an outer peripheral portion of the outer periphery of the support portion 11b1 opposite to the main recessed portions 11c1, 11c2, 11c3 and a corresponding portion of the peripheral wall portion 11a facing the outer peripheral portion. It is arranged. In addition, a plurality of through holes 11d1 for fitting the sealed terminal 31 are formed in the part of the lead wire wiring recessed portion 11d of the partition wall portion 11b. The recesses 11c other than the main recesses 11c1, 11c2, 11c3 (hereinafter referred to as sub-recesses 11c4, 11c5, 11c6, 11c7) among the recesses 11c include main recesses 11c1, 11c2, 11c3 and lead wire wiring recesses 11d. It is arranged so as to fill the space between them. In the following, when it is not necessary to distinguish between the main recesses 11c1, 11c2, 11c3 and the sub recesses 11c4, 11c5, 11c6, 11c7, they are simply referred to as recesses 11c.

Further, in the present embodiment, the partition wall portion 11b is formed such that the wall thickness t (see FIG. 1) becomes thicker toward the first space S1 toward the inner wall surface W3 of the peripheral wall portion 11a. Specifically, in the partition wall portion 11b, the second space side wall surface W2 is formed as a flat surface that is orthogonal to the drive shaft 21, and the first space side wall surface W1 moves toward the inner wall surface W3 from the support portion 11b1 side. It is curved so as to be separated from the two-space side wall surface W2.

Next, the extending direction and the opening position of the suction passage P1 will be described.
The suction passage P1 is formed so as to pass through a suction passage forming portion 11g that is provided on the peripheral wall portion 11a so as to project in the tangential direction of the inner wall surface W3. It penetrates the inner wall surface W3.
Further, the first space side opening end P1a of the suction passage P1 is open to any one of the plurality of recesses 11c. Specifically, the first space-side opening end P1a is opened closer to the triangular bottom 11e side of the recess 11c at the inner wall surface W3 side of the recess 11c.
In the present embodiment, the first space-side opening end P1a opens into the middle main recess 11c2 of the three main recesses 11c1, 11c2, and 11c3. More specifically, the first space-side opening end P1a has a triangular shape at a portion on the inner wall surface W3 side of the partition wall 11f between the main recess 11c2 and one sub-recess 11c4 adjacent to the main recess 11c2. The bottom 11e side is opened near. Therefore, the first space-side opening end P1a is opened so as to face a portion of the partition wall 11f having the highest wall height between the main recess 11c2 and the other sub-recess 11c5 adjacent to the main recess 11c2. There is.

Next, the flow of the refrigerant in the electric compressor 100 will be described.
The refrigerant from the low pressure side of the refrigerant circuit is introduced into the suction chamber H1 via the suction passage P1, and then is guided to the space H4 near the outer end portion of the scroll unit 1 via the refrigerant introduction passage (not shown). Then, the refrigerant in the space H4 is taken into the closed space between the spiral wraps 2b and 3b and is compressed in the closed space. The compressed refrigerant is discharged to the discharge chamber H2 via the discharge hole 2a2 and the one-way valve 16, and then discharged from the discharge chamber H2 to the high pressure side of the refrigerant circuit via the discharge passage 12a and the discharge port P2.
Here, the main flow of the refrigerant led out from the first space side opening end P1a of the suction passage P1 will be described in detail with reference to FIGS. 3 and 5. As shown by the thick line arrows in FIGS. 3 and 5, the refrigerant derived from the first space side opening end P1a is introduced into the main recess 11c2, flows along the triangular bottom 11e, and flows into the main recess 11c2 and the sub-recess. The wall of the partition wall 11f between the recess 11c5 and the recess 11c5 abuts on a portion where the wall height is high. The refrigerant hitting the partition wall 11f then flows mainly toward the supporting portion 11b1 side along the triangular bottom portion 11e and the partition wall 11f. Since the wall height of the partition wall 11f becomes lower as it approaches the support portion 11b1, the refrigerant flowing along the partition wall 11f mainly gets over the portion of the partition wall 11f on the support portion 11b1 side and flows along the outer periphery of the support portion 11b1. To do. Then, the refrigerant flowing along the outer periphery of the support portion 11b1 flows down into the next main concave portion 11c3, flows along the triangular bottom portion 11e, and the partition wall 11f between the main concave portion 11c3 and the sub concave portion 11c6. And then most of it is guided to the electric motor 20 side. As described above, the power switching element (not shown) of the inverter 30 is mainly arranged around the portion corresponding to the main recess 11c3 of the second space side wall surface W2 of the partition wall 11b. Therefore, as described above, the refrigerant is caused to flow toward the main recess 11c3 to concentrate and cool the portion of the partition wall portion 11b corresponding to the power switching element, thereby effectively suppressing the temperature rise of the power switching element. can do.

According to the electric compressor 100 of the present embodiment, the plurality of recesses 11c that are recessed in the shape of a triangular prism toward the second space S2 side surround the support portion 11b1 of the first space side wall surface W1 of the partition wall portion 11b. Each of the concave portions 11c is arranged such that one side portion 11e1 of the triangular bottom portion 11e thereof is separated from and parallel to one side portion 11e1 of the adjacent concave portion 11c. By arranging the plurality of recessed portions 11c in the partition wall portion 11b in this manner, the portion (partition wall 11f) between the recessed portions 11c of the partition wall portion 11b has a truss structure whose basic unit is a triangular frame. Become a rib. Therefore, according to the electric compressor 100, a rib having a truss structure can be formed on the partition wall portion 11b so as to surround the support portion 11b1. As a result, for example, even if an aluminum-based material is used as the material of the partition wall portion 11b which is a part of the housing 10 for weight reduction, the rib of the truss structure makes the partition wall portion 11b have a required strength. Can be held.
In this way, it is possible to provide the electric compressor 100 capable of holding the required strength while reducing the weight of the partition wall portion 11b.

Further, in the present embodiment, the support portion 11b1 is provided in a cylindrical shape from the first space side wall surface W1 of the partition wall portion 11b toward the electric motor 20 side. Then, a part of the plurality of concave portions 11c is arranged such that one side portion 11e1 of the triangular bottom portion 11e is along the outer periphery of the support portion 11b1. As a result, the hub formed of the cylindrical support portion 11b1 and the peripheral wall portion 11a can be connected to each other by the rib formed of the partition wall 11f between the concave portions 11c, and the partition wall portion 11b can be reinforced more efficiently. You can

Further, in the present embodiment, the front housing 11 is configured to have a suction passage P1 that is formed so as to penetrate the peripheral wall portion 11a and guides the fluid into the first space S1. As a result, the electric motor 20 housed in the first space S1 can be cooled. In addition, since the plurality of recesses 11c recessed toward the second space are formed in the first space side wall surface W1 of the partition wall 11b, the refrigerant is caused to flow closer to the second space side wall surface W2 side. Therefore, the temperature rise of the power switching element of the inverter 30 can be effectively suppressed.

Further, in the present embodiment, the first space side opening end P1a of the suction passage P1 is configured to open in any one of the plurality of recesses 11c. Accordingly, the refrigerant can be made to flow along the triangular bottom portion 11e of the partition wall portion 11b without fail, so that the partition wall portion 11b can be cooled more effectively.

Further, in the present embodiment, the suction passage P1 extends in the tangential direction of the inner wall surface W3 of the peripheral wall portion 11a and penetrates the inner wall surface W3, and at the portion of the recess portion 11c on the inner wall surface W3 side, the triangular bottom portion of the recess portion 11c. The configuration is such that it opens toward the 11e side. This allows the refrigerant to flow from the inner wall surface W3 side toward the support portion 11b1 side along the triangular bottom portion 11e of the recess 11c and to be reliably guided to the adjacent recess 11c side.

Further, in the present embodiment, the partition wall portion 11b is formed such that the wall thickness t thereof becomes thicker toward the inner wall surface W3 of the peripheral wall portion 11a of the front housing 11. As a result, the wall height of the partition wall 11f between the recesses 11c can be partially increased, so that the strength of the partition wall 11f as a rib can be increased. Then, in this case, the first space side opening end P1a can be opened so as to face the portion of the partition wall 11f between the recess 11c and the other recess 11c adjacent thereto that has the highest wall height. The refrigerant flowing out from the opening end P1a on the first space side can be reliably abutted against the partition wall 11f to flow along the partition wall 11f and the triangular bottom portion 11e.

In the present embodiment, the power switching element of the inverter 30 is mainly arranged around the part corresponding to the main recess 11c3, but the present invention is not limited to this, and the partition wall 11b is located on the second space side. It may be arranged at an appropriate position of the wall surface W2, avoiding a portion corresponding to the drive shaft 21 of the electric motor 20. In this case, the arrangement position and size of each recess 11c, the wall height of the partition wall 11f between the recesses 11c, and the like are appropriately set so that the refrigerant flows in a concentrated manner in a portion of the partition wall 11b corresponding to the power switching element. Then, the refrigerant may be guided appropriately.

Further, in the present embodiment, the lead wire wiring recessed portion 11d for the lead wire wiring between the inverter 30 and the electric motor 20, which is formed in a region of the first space side wall surface W1 that surrounds the support portion 11b1, is generally formed. Although it is formed so as to have an oval cross section and be concave, the present invention is not limited to this. Although illustration is omitted, the lead wire wiring recessed portion 11d is formed so as to be recessed into a triangular prism shape toward the second space S2 side, and one side portion of the triangular bottom portion is adjacent to the recessed portion 11d. The recess 11c may be arranged so as to be spaced apart from and parallel to the one side 11e1 of the recess 11c. Thus, the recess 11c and the lead wire wiring recess 11d can form a rib having a truss structure in the entire region surrounding the supporting portion 11b1 of the partition wall portion 11b, thereby further enhancing the rigidity of the partition wall portion 11b. it can.

Further, although the number of the concave portions 11c is seven, the number of the concave portions 11c is not limited to this, and can be set as appropriate. Further, although the case where the lead wire wiring recessed portion 11d is provided in the partition wall portion 11b and the lead wire 32 is passed through the partition wall portion 11b has been described, the lead wire 32 is not limited to this position. .. For example, the lead wire 32 may be passed through the peripheral wall portion 11a to be passed. In this case, since the entire region of the first space side wall surface W1 surrounding the supporting portion 11b1 can be used for forming the concave portion 11c, the concave portion 11c may be formed over the entire circumference of the supporting portion 11b1.

Further, in the present embodiment, the case where the compression mechanism is the scroll compression mechanism has been described as an example, but the present invention is not limited to this, and an appropriate mechanism such as a reciprocating compression mechanism can be adopted.

The housing 10 is divided into the front housing 11, the rear housing 12, and the inverter cover 13, which are fastened together. However, the present invention is not limited to this, and the inside of the housing 10 is divided by the partition wall portion 11b. As long as it is divided into one space S1 and the second space S2, it may be divided in any way.

The preferred embodiments of the present invention and the modifications thereof have been described above, but the present invention is not limited to the above embodiments and modifications, and various modifications and changes can be made based on the technical idea of the present invention. Is.

1...Compression mechanism (scroll unit)
10... Housing 11a... Peripheral wall 11b... Partition wall 11b1... Support 11c... Recess 11e... Triangular bottom 11e1... One side 20... .... Electric motor 21 ... Drive shaft 30 ... Motor drive circuit (inverter)
100... Electric compressor P1... Suction passage P1a... First space side open end S1... First space S2... Second space t... ..Wall thickness W1...First space side wall surface W2...Second space side wall surface W3...Inner wall surface of peripheral wall portion

Claims (5)

A compression mechanism that compresses fluid, an electric motor that drives the compression mechanism, and a motor drive circuit that controls voltage application to the electric motor are provided in a housing, and an internal space of the housing drives the electric motor. An electric compressor divided into a first space for accommodating the compression mechanism and the electric motor and a second space for accommodating the motor drive circuit by a partition wall having a support for supporting one end of the shaft. And
The partition wall portion has a plurality of recesses that are recessed in a triangular prism shape toward the second space side in a region of the first space side wall surface that surrounds the support portion,
The plurality of recesses are respectively arranged such that one side of the triangular bottom part thereof is spaced apart from and parallel to the one side of the adjacent recess ,
The housing has a suction passage that is formed so as to penetrate the peripheral wall portion thereof and guides a fluid into the first space,
The first space side opening end of the suction passage is open to any one of the plurality of recesses,
The suction passage extends in the tangential direction of the inner wall surface of the peripheral wall portion and penetrates the inner wall surface, and in the portion on the inner wall surface side of the recessed portion, opens close to the triangular bottom portion side,
The partition wall portion is formed such that the wall thickness thereof becomes thicker toward the first space toward the inner wall surface of the peripheral wall portion.
Electric compressor. The support part is provided in a cylindrical shape from the first space side wall surface of the partition wall part toward the electric motor side,
The electric compressor according to claim 1, wherein a part of the plurality of concave portions is arranged such that one side portion of the triangular bottom portion is along the outer periphery of the support portion. Site of at least the partition wall portion of said housing is made of an aluminum-based material, an electric compressor according to claim 1 or 2. The partition wall portion has a lead wire wiring concave portion for lead wire wiring between the motor drive circuit and the electric motor, in a region surrounding the support portion of the first space side wall surface,
Each of the lead wire wiring recesses is recessed in a triangular prism shape toward the second space side, and one side of the triangular bottom is separated from and parallel to the one side of the adjacent recess. It arranged the motor-driven compressor according to any one of claims 1-3. It said compression mechanism is a scroll type compression mechanism, an electric compressor according to any one of claims 1-4.