JP2021161955A - Motor compressor - Google Patents

Abstract

To provide a motor compressor capable of suppressing deterioration in reliability and increase in size.SOLUTION: A partition wall has a protruding wall part 25f protruding toward an inverter accommodation chamber 91; a communication passage 24 is formed inside the protruding wall part 25f; and a plurality of switching elements 101 is arranged side by side while being in thermal contact with the protruding wall part 25f, and is cooled by refrigerant flowing in the communication passage 24.SELECTED DRAWING: Figure 5

Description

The present invention relates to an electric compressor.

Conventionally, an electric compressor as described in Patent Document 1 is known.
The above electric compressor includes an electric motor that rotates the rotating shaft, a housing that houses an inverter on which a switching element is mounted and drives the electric motor, and a housing that is provided at the first end of the rotating shaft and of the rotating shaft. It is provided with a compression unit that compresses the refrigerant by rotation. The housing has a motor housing chamber in which the electric motor is housed. The housing has an inverter accommodating chamber for accommodating the inverter. The inverter accommodating chamber is adjacent to the motor accommodating chamber in the radial direction of the rotating shaft.

The inverter accommodating chamber has a cylinder having a suction port for sucking the refrigerant. The cylinder communicates the suction port with the inside of the compression portion. A switching element is attached to the outer surface of the cylinder. In the electric compressor configured in this way, when the rotating shaft is rotated by the drive of the electric motor, the refrigerant is sucked into the compression section from the suction port of the cylinder, the refrigerant is compressed by the compression section, and the compressed refrigerant is released. It is discharged from the discharge port formed in the housing. Further, the switching element is cooled through the cylinder by passing the refrigerant through the inside of the cylinder.

Further, conventionally, an electric compressor as described in Patent Document 2 is also known.
The above electric compressor is provided at the first end of the rotating shaft and is provided by an electric motor that rotates the rotating shaft, a housing that houses an inverter on which elements constituting an inverter circuit are mounted, and by rotating the rotating shaft. It is provided with a compression unit that compresses the refrigerant. The housing has a motor housing chamber in which the electric motor is housed. The housing has an inverter accommodating chamber for accommodating the inverter. The inverter accommodating chamber is adjacent to the motor accommodating chamber in the axial direction of the rotating shaft, and a refrigerant passage connecting the suction port of the cylinder and the compression portion is formed between the motor accommodating chamber and the inverter accommodating chamber. ..

In recent years, diversification of application destinations of electric compressors has been studied. For example, depending on the application destinations of electric compressors, it is necessary to realize miniaturization of electric compressors without changing the output of the electric compressors. However, the voltage that can be used by the inverter is limited depending on the application destination of the electric compressor. In order not to change the output of the electric compressor, it is necessary to lower the voltage used in the inverter and increase the current flowing through the inverter. These electric compressors have a structure in which elements that generate a particularly large amount of heat are cooled with a refrigerant preferentially over an electric motor, and even if the current is increased, a decrease in reliability can be suppressed.

Japanese Unexamined Patent Publication No. 2002-161859 Japanese Unexamined Patent Publication No. 2005-201108

If the current flowing through the inverter or the electric motor is increased, the pattern on the board of the inverter must be thickened, and as a result, the board and the inverter become large. On the other hand, in the above-mentioned electric compressor, if the substrate is enlarged, the physique of the entire compressor may become large. For example, in Patent Document 1, due to the existence of a tubular body that must be arranged in the vicinity of the substrate, the enlarged substrate greatly protrudes from the motor accommodating chamber. In addition, the existence of the tubular body that protrudes in the radial direction itself causes an increase in the size of the housing. In Patent Document 2, when the size of the substrate is increased, the size of the entire housing is increased in the radial direction.

An object of the present invention is to provide an electric compressor capable of suppressing a decrease in reliability and an increase in size.

An electric compressor that solves the above problems includes an electric motor that rotates a rotating shaft, an inverter that has a circuit board on which a plurality of switching elements are mounted, and drives the electric motor, and a motor that accommodates the electric motor. It has a chamber, an inverter accommodating chamber arranged alongside the motor accommodating chamber in the radial direction of the rotating shaft and accommodating the inverter, and a communication passage for introducing a refrigerant from the outside into the motor accommodating chamber. A housing and a compression unit for compressing a refrigerant sucked from the motor accommodation chamber are provided, and the housing partitions the motor accommodation chamber and the inverter accommodation chamber and extends in the axial direction of the rotation shaft. The circuit board has a partition wall, and the circuit board is an electric compressor arranged in the inverter accommodating chamber along the partition wall, and the partition wall has a protruding portion protruding toward the inverter accommodating chamber. The communication passage is formed inside the protrusion, and the plurality of switching elements are arranged side by side while being in thermal contact with the protrusion, and are cooled by a refrigerant flowing in the communication passage. Will be done.

According to this, since the communication passage for supplying the refrigerant to the electric motor and the compression unit is formed inside the partition wall that separates the motor accommodation chamber and the inverter accommodation chamber, the existence of the communication passage is present in the circuit board. It does not interfere with the expansion of the accommodation space. In addition, since the communication passage extends along the switching elements lined up on the protrusions, the switching elements can be preferentially cooled by the intake refrigerant before heat is obtained from the electric motor, and the deterioration of reliability is suppressed. can.

In the above electric compressor, the electric motor divides the motor accommodating chamber into two coil end accommodating chambers accommodating coil ends at both ends of the electric motor, and the communication passage is formed by the two coils. It is preferable to introduce the refrigerant into the coil end accommodating chamber on the side of the end accommodating chamber away from the compression portion.

According to this, when the refrigerant sucked into the motor accommodating chamber is compressed by the compression unit, the refrigerant moves over the entire length of the electric motor, so that the entire electric motor can be cooled. Therefore, the cooling efficiency of the electric motor can be improved, and the decrease in reliability can be suppressed.

According to the present invention, it is possible to suppress a decrease in reliability and an increase in size.

The perspective view which showed the electric compressor in an embodiment. Perspective view of the motor housing of the electric compressor. Front view of the motor housing. FIG. 3 is a cross-sectional view of the electric compressor when cut along the 4-4 line of FIG. Top view of the inverter storage chamber of the electric compressor. FIG. 5 is a cross-sectional view taken along the line 6-6 of FIG. FIG. 5 is a cross-sectional view taken along the line 7-7 of FIG.

Hereinafter, an embodiment in which the electric compressor is embodied will be described with reference to FIGS. 1 to 7.
As shown in FIG. 1, the electric compressor 1 includes a housing 10 and a compression unit 60. The housing 10 includes a motor housing 20, a cover 30, a front housing 40, and a discharge housing 50. The motor housing 20, the cover 30, the front housing 40, and the discharge housing 50 are made of metal, for example, aluminum. A suction port 21 is formed in the motor housing 20. A discharge port 50a is formed in the discharge housing 50. The electric compressor 1 compresses air as a refrigerant sucked from the suction port 21 by the compression unit 60 and discharges it from the discharge port 50a.

As shown in FIGS. 2 and 3, the motor housing 20 has a cylindrical first accommodating portion 22 and a second accommodating portion that is aligned with the first accommodating portion 22 in a direction orthogonal to the axial direction of the first accommodating portion 22. 23 and. In the axial direction of the first accommodating portion 22, the first accommodating portion 22 and the second accommodating portion 23 are open to the first end portion 20a of the motor housing 20 in the axial direction of the first accommodating portion 22. The first accommodating portion 22 and the second accommodating portion 23 communicate with each other in a direction orthogonal to the axial direction of the first accommodating portion 22.

As shown in FIG. 4, in the axial direction of the first accommodating portion 22, the depth of the first accommodating portion 22 from the first end portion 20a of the motor housing 20 is the first from the first end portion 20a of the motor housing 20. 2 Deeper than the depth of the housing 23. The second accommodating portion 23 communicates with a portion of the first accommodating portion 22 near the first end portion 20a of the motor housing 20.

As shown in FIGS. 3 and 4, the first accommodating portion 22 has a bottomed cylindrical shape. The first accommodating portion 22 has a bottom wall 22a and a cylindrical peripheral wall 22b extending from the bottom wall 22a in the axial direction of the first accommodating portion 22. A cylindrical boss portion 22c is projected from the bottom wall 22a. The axis of the boss portion 22c coincides with the axis of the first accommodating portion 22.

The peripheral wall 22b is not formed in a portion where the first accommodating portion 22 and the second accommodating portion 23 communicate with each other. The portion of the peripheral wall 22b located on the opposite side of the bottom wall 22a is open toward the second accommodating portion 23 when viewed from the axial direction of the first accommodating portion 22. The predetermined range indicates the depth of the second accommodating portion 23 in the axial direction of the first accommodating portion 22.

The second accommodating portion 23 has a bottom wall 23a and a peripheral wall 23b extending from the bottom wall 23a in the same direction as the peripheral wall 22b extends. The bottom wall 23a is formed by extending a portion of the bottom wall 22a and the peripheral wall 22b of the first accommodating portion 22 near the second accommodating portion 23 in a direction orthogonal to the axial direction of the first accommodating portion 22. ing. One direction orthogonal to the axial direction of the first accommodating portion 22 is a direction from the first accommodating portion 22 toward the second accommodating portion 23.

The peripheral wall 23b extends from the outer edge of the bottom wall 23a. The peripheral wall 23b is not formed in a portion where the first accommodating portion 22 and the second accommodating portion 23 communicate with each other. The peripheral wall 23b opens toward the first accommodating portion 22 when viewed from the axial direction of the first accommodating portion 22.

As shown in FIG. 3, the portion of the peripheral wall 22b in a predetermined range and the peripheral wall 23b are continuous with each other. The first end portion 20a of the motor housing 20 is formed by a portion of a predetermined range of the peripheral wall 22b and the peripheral wall 23b. The opening of the first accommodating portion 22 and the opening of the second accommodating portion 23 form an opening of the first end portion 20a of the motor housing 20. A plurality of bolt holes 20c are formed in the first end portion 20a of the motor housing 20 so as to surround the first accommodating portion 22.

As shown in FIG. 2, the motor housing 20 has a third accommodating portion 25 and a fourth accommodating portion 26. The third accommodating portion 25 is arranged so as to be aligned with the first accommodating portion 22 and the second accommodating portion 23 in a direction orthogonal to the axial direction of the first accommodating portion 22. The fourth accommodating portion 26 is arranged so as to be aligned with the first accommodating portion 22 and the second accommodating portion 23 in the axial direction of the first accommodating portion 22. The third accommodating portion 25 and the fourth accommodating portion 26 are arranged so as to be aligned in the axial direction of the first accommodating portion 22. The third accommodating portion 25 and the fourth accommodating portion 26 are open to the second end portion 20b in the direction orthogonal to the axial direction of the first accommodating portion 22 of the motor housing 20. The third accommodating portion 25 and the fourth accommodating portion 26 are open toward the side opposite to the first accommodating portion 22 and the second accommodating portion 23 in the direction orthogonal to the axial direction of the first accommodating portion 22. The third accommodating portion 25 and the fourth accommodating portion 26 communicate with each other in the axial direction of the first accommodating portion 22.

In the direction orthogonal to the axial direction of the first accommodating portion 22, the depth of the fourth accommodating portion 26 from the second end portion 20b of the motor housing 20 is the third accommodating portion from the second end portion 20b of the motor housing 20. Deeper than 25 depths. The third accommodating portion 25 communicates with a portion of the fourth accommodating portion 26 near the second end portion 20b of the motor housing 20.

The third accommodating portion 25 includes a bottom wall 25a and a peripheral wall 25b extending from the bottom wall 25a so as to be separated from the first accommodating portion 22 and the second accommodating portion 23 in a direction orthogonal to the axial direction of the first accommodating portion 22. ,have. The bottom wall 25a has a plate shape extending in the axial direction of the first accommodating portion 22.

The bottom wall 25a has a main body wall portion 25c formed so as to be aligned with the first accommodating portion 22 in a direction orthogonal to the axial direction of the first accommodating portion 22. The bottom wall 25a has a first extending wall portion 25d formed so as to be aligned with the second accommodating portion 23 and integrally formed with the main body wall portion 25c in a direction orthogonal to the axial direction of the first accommodating portion 22. doing. The bottom wall 25a has a second extending wall portion 25e extending from the first extending wall portion 25d in the axial direction of the first accommodating portion 22. The first extended wall portion 25d and the second extended wall portion 25e are integrally formed. The second extending wall portion 25e extends so as to be separated from the first end portion 20a of the motor housing 20 in the axial direction of the first accommodating portion 22. The main body wall portion 25c, the first extending wall portion 25d, and the second extending wall portion 25e are formed so as to be flush with each other.

The bottom wall 25a has a protruding wall portion 25f integrally formed with an end portion of the main body wall portion 25c and the first extending wall portion 25d located on the fourth accommodating portion 26 side in the axial direction of the first accommodating portion 22. doing. The protruding wall portion 25f extends in a direction orthogonal to the axial direction of the first accommodating portion 22. The protruding wall portion 25f is integrally formed with the bottom walls 22a and 23a shown in FIG. The protruding wall portion 25f protrudes from the bottom walls 22a and 23a shown in FIG. 4, and is located closer to the opening end of the third accommodating portion 25 than the main body wall portion 25c and the first extending wall portion 25d. The protruding wall portion 25f, the main body wall portion 25c, and the first extending wall portion 25d are arranged so as to form a step.

The main body wall portion 25c, the first extending wall portion 25d, and the protruding wall portion 25f are integrally formed with the bottom wall 22a and the peripheral wall 22b of the first accommodating portion 22 and the bottom wall 23a and the peripheral wall 23b of the second accommodating portion 23. ing. The main body wall portion 25c, the first extending wall portion 25d, and the protruding wall portion 25f partition the first accommodating portion 22 and the third accommodating portion 25.

A through hole 251 is formed in the first extending wall portion 25d. The through hole 251 is arranged closer to the first extending wall portion 25d than the boundary between the first extending wall portion 25d and the second extending wall portion 25e. As shown in FIGS. 2 and 4, the through hole 251 penetrates the first extending wall portion 25d and the peripheral wall 23b in the thickness direction.

As shown in FIG. 2, the peripheral wall 25b has a first accommodating portion 22 and a second accommodating portion from the outer edges of the main body wall portion 25c, the first extending wall portion 25d, the second extending wall portion 25e, and the protruding wall portion 25f. It extends away from 23. The peripheral wall 25b is not formed in a portion where the third accommodating portion 25 and the fourth accommodating portion 26 communicate with each other. The peripheral wall 25b is not formed at the end of the protruding wall portion 25f on the side of the fourth accommodating portion 26. The peripheral wall 25b opens toward the fourth accommodating portion 26 when the bottom wall 25a is viewed in a plan view.

The fourth accommodating portion 26 has a bottom wall 26a and a peripheral wall 26b extending from the bottom wall 26a in the same direction in which the peripheral wall 25b extends. The bottom wall 26a has a first bottom wall 261, a second bottom wall 262, and a third bottom wall 263. The first bottom wall 261 and the second bottom wall 262, and the third bottom wall 263 are the bottom wall 22a of the first accommodating portion 22 shown in FIG. 4 and the first accommodating portion 22 shown in FIG. 4 in the axial direction of the first accommodating portion 22. The bottom wall 23a of the two accommodating portions 23 and the protruding wall portion 25f of the third accommodating portion 25 are integrally formed. The bottom walls 22a and 23a and the protruding wall portion 25f form a part of the wall portion of the fourth accommodating portion 26. The bottom walls 22a and 23a and the protruding wall portion 25f partition the first accommodating portion 22, the second accommodating portion 23, and the fourth accommodating portion 26.

When the opening of the third accommodating portion 25 and the opening of the fourth accommodating portion 26 are viewed from the front in a direction orthogonal to the axial direction of the first accommodating portion 22, the first bottom wall 261 is on the axis of the first accommodating portion 22. Is located in. The first bottom wall 261 and the second bottom wall 262, and the third bottom wall 263 are arranged in this order in one direction orthogonal to the axial direction of the first accommodating portion 22. The second bottom wall 262 is arranged closer to the opening end of the fourth accommodating portion 26 than the first bottom wall 261. The first bottom wall 261 and the second bottom wall 262 are arranged so as to form a step. The third bottom wall 263 is arranged closer to the opening end of the fourth accommodating portion 26 than the second bottom wall 262. The second bottom wall 262 and the third bottom wall 263 are arranged so as to form a step. In the fourth accommodating portion 26, the depth from the second end portion 20b of the motor housing 20 to the first bottom wall 261 is deeper than the depth from the second end portion 20b of the motor housing 20 to the second bottom wall 262. In the fourth accommodating portion 26, the depth from the second end portion 20b of the motor housing 20 to the second bottom wall 262 is deeper than the depth from the second end portion 20b to the third bottom wall 263 of the motor housing 20. The first bottom wall 261 and the second bottom wall 262 and the third bottom wall 263 have a depth from the opening end of the fourth accommodating portion 26 in one direction orthogonal to the axial direction of the first accommodating portion 22. It is arranged so that it becomes shallow. The depth from the second end 20b of the motor housing 20 to the first bottom wall 261 and the second bottom wall 262 and the third bottom wall 263 is the depth from the second end 20b of the motor housing 20 to the third accommodating portion. It is deeper than the depth to the bottom wall 25a of 25.

The peripheral wall 26b extends from the outer edges of the first bottom wall 261 and the second bottom wall 262, and the third bottom wall 263. The peripheral wall 26b is not formed in a portion where the third accommodating portion 25 and the fourth accommodating portion 26 communicate with each other. The peripheral wall 26b opens toward the third accommodating portion 25 when the bottom wall 26a is viewed in a plan view.

When the bottom wall 25a of the third accommodating portion 25 and the bottom wall 26a of the fourth accommodating portion 26 are viewed in a plan view, the peripheral wall 25b of the third accommodating portion 25 and the peripheral wall 26b of the fourth accommodating portion 26 are continuous with each other. There is. The second end portion 20b of the motor housing 20 is formed by a peripheral wall 25b and a peripheral wall 26b. The opening of the third accommodating portion 25 and the opening of the fourth accommodating portion 26 form an opening of the second end portion 20b of the motor housing 20.

A first notch groove 27 and a second notch groove 28 are formed in the second end portion 20b of the motor housing 20. The first notch groove 27 is formed by cutting out a part of the peripheral wall 26b forming the fourth accommodating portion 26, which is opposed to the protruding wall portion 25f in the axial direction of the first accommodating portion 22. When the bottom wall 26a of the fourth accommodating portion 26 is viewed in a plan view, the first notch groove 27 is arranged so as to be aligned with the third bottom wall 263 in the axial direction of the first accommodating portion 22. The second notch groove 28 is formed by cutting out a part of the peripheral wall 25b forming the third accommodating portion 25, which is lined up with the main body wall portion 25c in the axial direction of the first accommodating portion 22. As shown in FIG. 3, when the first end portion 20a of the motor housing 20 is viewed from the axial direction of the first accommodating portion 22, the second notch groove 28 is located in a direction orthogonal to the axial direction of the first accommodating portion 22. It is arranged so as to line up with one housing unit 22.

As shown in FIG. 2, a plurality of bolt holes 20d for fixing the cover 30 shown in FIG. 1 to the second end portion 20b of the motor housing 20 are provided in the second end portion 20b of the motor housing 20 as a third accommodating portion. It is formed so as to surround the 25 and the fourth housing portion 26. The inner surface of the second end 20b of the motor housing 20 projects from the bottom wall 25a of the third housing 25 and the bottom wall 26a of the fourth housing 26 to the extent that it does not reach the second end 20b of the motor housing 20. A plurality of fixed support portions 20e are formed. Bolt holes 20f are formed at each of the ends of the plurality of fixed support portions 20e. The ends of the plurality of fixed support portions 20e are located closer to the second end portion 20b of the motor housing 20 than the protruding wall portion 25f, and are all arranged at the same height.

As shown in FIG. 4, the front housing 40 has a plate shape and is connected to the first end portion 20a of the motor housing 20. The front housing 40 closes the openings of the first accommodating portion 22 and the second accommodating portion 23.

The front housing 40 has a disk-shaped bottom wall 41 arranged near the first accommodating portion 22 in the first end portion 20a of the motor housing 20, and a cylindrical shape from the bottom wall 41 toward the side opposite to the motor housing 20. It has a peripheral wall 42 extending to and from. The front housing 40 has a lid wall 43 that is integrally formed with the peripheral wall 42 and is arranged near the second accommodating portion 23 in the first end portion 20a of the motor housing 20.

The bottom wall 41 is located on the axis of the first accommodating portion 22. The bottom wall 41 is fitted inside the peripheral wall 22b of the motor housing 20. The bottom wall 41 is in contact with a part of the inner peripheral surface of the peripheral wall 22b in a predetermined range. An insertion hole 41a is formed in the central portion of the bottom wall 41. The insertion hole 41a penetrates the bottom wall 41 in the thickness direction. The axis of the insertion hole 41a coincides with the axis of the first accommodating portion 22 and the axis of the boss portion 22c.

The peripheral wall 42 extends from the bottom wall 41 so as to form a stepped surface 42a extending so as to be orthogonal to the outer peripheral surface of the bottom wall 41. The stepped surface 42a extends outward from the outer peripheral surface of the bottom wall 41. The stepped surface 42a of the peripheral wall 42 is in contact with the peripheral wall 22b in the axial direction of the first accommodating portion 22. The lid wall 43 extends from the peripheral wall 42 in one direction orthogonal to the axial direction of the first accommodating portion 22. The lid wall 43 closes the opening of the second accommodating portion 23.

A motor accommodating chamber 80 is formed in the housing 10. The motor housing chamber 80 is partitioned by the bottom walls 22a and 23a of the motor housing 20, the peripheral walls 22b and 23b of the motor housing 20, and the bottom wall 41 and the lid wall 43 of the front housing 40. The motor accommodating chamber 80 includes a motor chamber 81 and a motor wiring accommodating chamber 82. The motor chamber 81 is a space closer to the first accommodating portion 22 with reference to the boundary between the peripheral wall 22b and the bottom wall 23a in the motor accommodating chamber 80. The motor wiring accommodating chamber 82 is a space closer to the second accommodating portion 23 with reference to the boundary between the peripheral wall 22b and the bottom wall 23a in the motor accommodating chamber 80. The motor chamber 81 and the motor wiring accommodating chamber 82 communicate with each other at a position closer to the first end portion 20a of the motor housing 20 in the axial direction of the first accommodating portion 22.

As shown in FIG. 1, the cover 30 has a flat plate shape and is connected to the second end portion 20b of the motor housing 20. The cover 30 closes the openings of the third accommodating portion 25 and the fourth accommodating portion 26. The cover 30 is fixed to the second end portion 20b of the motor housing 20 by a plurality of bolts 86. Each of the plurality of bolts 86 is screwed into the bolt hole 20d shown in FIG.

As shown in FIGS. 1 and 2, the housing 10 is formed with a circuit board accommodating chamber 90 and a connection wiring accommodating chamber 93. The circuit board accommodating chamber 90 and the connection wiring accommodating chamber 93 are formed by closing the opening of the second end portion 20b of the motor housing 20 with the cover 30. The circuit board accommodating chamber 90 and the connection wiring accommodating chamber 93 are partitioned by bottom walls 25a and 26a of the motor housing 20, peripheral walls 25b and 26b of the motor housing 20, and a cover 30. The circuit board accommodating chamber 90 is a space closer to the first extended wall portion 25d with reference to the boundary between the first extended wall portion 25d and the second extended wall portion 25e. The connection wiring accommodating chamber 93 is a space closer to the second extended wall portion 25e with reference to the boundary between the first extended wall portion 25d and the second extended wall portion 25e.

The circuit board accommodating chamber 90 includes an inverter accommodating chamber 91 and a filter accommodating chamber 92. The inverter accommodating chamber 91 is a space closer to the main body wall portion 25c with reference to the protruding wall portion 25f in the circuit board accommodating chamber 90. The filter accommodating chamber 92 is a space closer to the bottom wall 26a with reference to the protruding wall portion 25f in the circuit board accommodating chamber 90. The inverter accommodating chamber 91 and the filter accommodating chamber 92 communicate with each other through a space formed between the protruding wall portion 25f and the cover 30. The inverter accommodating chamber 91 and the connection wiring accommodating chamber 93 communicate with each other through a space formed between the boundary between the first extending wall portion 25d and the second extending wall portion 25e and the cover 30.

Here, the main body wall portion 25c, the first extending wall portion 25d, and the protruding wall portion 25f partition the first accommodating portion 22 and the third accommodating portion 25. Therefore, the main body wall portion 25c, the first extending wall portion 25d, and the protruding wall portion 25f are partition walls that partition the motor accommodating chamber 80 and the inverter accommodating chamber 91. Further, the bottom walls 22a and 23a and the protruding wall portion 25f partition the first accommodating portion 22 and the second accommodating portion 23 and the fourth accommodating portion 26. Therefore, the bottom walls 22a and 23a and the protruding wall portion 25f are filter accommodating chamber partition walls that partition the motor accommodating chamber 80 and the filter accommodating chamber 92. The protruding wall portion 25f is a protruding portion that protrudes toward the inverter accommodating chamber 91.

As shown in FIG. 4, the electric compressor 1 includes a rotating shaft 11 and an electric motor 12 that rotates the rotating shaft 11. The first end portion 11a of the rotating shaft 11 is located inside the peripheral wall 42 of the front housing 40 via the insertion hole 41a of the bottom wall 41 of the front housing 40. A rolling bearing 11c is provided between the inner peripheral surface of the peripheral wall 42 and the outer peripheral surface of the rotating shaft 11. The rotating shaft 11 is rotatably supported by the front housing 40 via a rolling bearing 11c.

The second end portion 11b of the rotating shaft 11 is located inside the boss portion 22c. A slide bearing 11d is provided between the outer peripheral surface of the second end portion 11b of the rotating shaft 11 and the inner peripheral surface of the boss portion 22c. The second end 11b of the rotating shaft 11 is rotatably supported by the motor housing 20 via a slide bearing 11d. The axial direction A of the rotating shaft 11 coincides with the axial direction of the first accommodating portion 22.

The electric motor 12 is housed in the motor room 81 of the motor housing room 80. The electric motor 12 includes a cylindrical stator 13 and a rotor 14 arranged inside the stator 13. The rotor 14 rotates integrally with the rotating shaft 11. The rotor 14 has a rotor core 14a anchored to the rotating shaft 11 and a plurality of permanent magnets (not shown) provided on the rotor core 14a. The stator 13 has a cylindrical stator core 13a fixed to the inner peripheral surface of the peripheral wall 22b of the first accommodating portion 22, and a coil 13b wound around the stator core 13a.

In the electric motor 12, the motor chamber 81 of the motor accommodating chamber 80 is partitioned into coil end accommodating portions 81a for accommodating the coil ends 13c of the coils 13b at both ends of the electric motor 12. The coil end accommodating portion 81a is formed at a position where the stator core 13a is sandwiched in the axial direction A of the rotating shaft 11.

The motor housing 20 has a communication passage 24 that communicates the suction port 21 and the motor accommodating chamber 80 and introduces air into the motor accommodating chamber 80 from the outside. The suction port 21 is a circular hole for sucking air into the motor accommodating chamber 80. The communication passage 24 is formed inside the protruding wall portion 25f. The communication passage 24 communicates the coil end accommodating portion 81a formed near the second end portion 11b located on the opposite side of the first end portion 11a of the rotating shaft 11 from the suction port 21. That is, the communication passage 24 introduces the refrigerant into the coil end accommodating portion 81a on the side of the two coil end accommodating portions 81a on the side away from the compression portion 60. The coil end accommodating portion 81a formed closer to the second end portion 11b and the suction port 21 are arranged at the same position in the axial direction A of the rotating shaft 11.

The compression unit 60 is a scroll type. The compression unit 60 includes a fixed scroll 61 and a movable scroll 62 arranged to face the fixed scroll 61. The fixed scroll 61 has a plate-shaped fixed substrate 61a and a fixed spiral wall 61b erected from the fixed substrate 61a. Further, the fixed scroll 61 has a fixed outer peripheral wall 61c extending in a cylindrical shape in the same direction as the fixed spiral wall 61b extends from the outer peripheral portion of the fixed substrate 61a. The fixed outer peripheral wall 61c surrounds the fixed spiral wall 61b. The open end surface of the fixed outer peripheral wall 61c is located on the side opposite to the fixed substrate 61a with respect to the tip surface of the fixed spiral wall 61b. The tip of the fixed outer peripheral wall 61c is connected to the peripheral wall 42 of the front housing 40.

The movable scroll 62 has a disk-shaped movable substrate 62a facing the fixed substrate 61a, and a movable spiral wall 62b erected from the movable substrate 62a toward the fixed substrate 61a. A cylindrical boss portion 62c is projected from the end surface of the movable substrate 62a on the side opposite to the fixed substrate 61a. The axial direction of the boss portion 62c coincides with the axial direction A of the rotating shaft 11. Further, a plurality of circular hole-shaped recesses 62d are formed around the boss portion 62c of the movable substrate 62a. The plurality of recesses 62d are arranged at predetermined intervals in the circumferential direction of the rotating shaft 11. An annular ring member 62e is fitted in each recess 62d. Further, a pin 62f inserted into the ring member 62e is projected from the peripheral wall 42 of the front housing 40.

The fixed spiral wall 61b and the movable spiral wall 62b are meshed with each other. The movable spiral wall 62b is located inside the fixed outer peripheral wall 61c. The tip surface of the fixed spiral wall 61b is in contact with the movable substrate 62a. A compression chamber 63 for compressing air as a refrigerant is partitioned by the fixed substrate 61a, the fixed spiral wall 61b, the fixed outer peripheral wall 61c, the movable substrate 62a, and the movable spiral wall 62b. The air introduced into the coil end accommodating portion 81a of the motor accommodating chamber 80 via the communication passage 24 is sucked into the compression chamber 63 through the gap between the stator 13 and the rotor 14. That is, the air is sucked into the compression unit 60 after passing through the electric motor 12.

A discharge hole 61d is formed in the central portion of the fixed substrate 61a. The discharge hole 61d penetrates the fixed substrate 61a in the thickness direction. A valve mechanism 61e is provided on the end surface of the fixed substrate 61a located on the opposite side of the fixed spiral wall 61b. The discharge hole 61d is opened and closed by the valve mechanism 61e according to the pressure of the compression chamber 63.

An eccentric shaft 64 that protrudes toward the movable scroll 62 from a position eccentric with respect to the axis of the rotating shaft 11 is integrally formed at the first end portion 11a of the rotating shaft 11. The axial direction of the eccentric shaft 64 coincides with the axial direction A of the rotating shaft 11. The eccentric shaft 64 is inserted in the boss portion 62c.

A bush 66 with an integrated balance weight 65 is fitted on the outer peripheral surface of the eccentric shaft 64. The balance weight 65 is housed in the peripheral wall 42 of the front housing 40. The movable scroll 62 is supported by the eccentric shaft 64 so as to be rotatable relative to the eccentric shaft 64 via the bush 66 and the slide bearing 67. Therefore, the compression portion 60 is provided at the first end portion 11a of the rotating shaft 11.

The rotation of the rotating shaft 11 is transmitted to the movable scroll 62 via the eccentric shaft 64, the bush 66, and the slide bearing 67, and the movable scroll 62 rotates on its axis. Then, when each pin 62f and the inner peripheral surface of each ring member 62e come into contact with each other, the rotation of the movable scroll 62 is prevented, and only the revolving motion of the movable scroll 62 is allowed. As a result, the movable scroll wall 62 revolves while the movable spiral wall 62b is in contact with the fixed spiral wall 61b, and the volume of the compression chamber 63 is reduced, so that the air sucked from the motor accommodating chamber 80 is compressed. That is, the compression unit 60 compresses the air sucked into the motor accommodating chamber 80. When the air compressed in the compression chamber 63 reaches a predetermined pressure, the valve mechanism 61e opens the discharge hole 61d, and the compressed air is discharged from the discharge hole 61d. The balance weight 65 reduces the unbalanced amount of the movable scroll 62 by canceling the centrifugal force acting on the movable scroll 62 when the movable scroll 62 revolves.

The discharge housing 50 has a plate-shaped bottom wall 51 and a peripheral wall 52 extending in a cylindrical shape from the outer edge of the bottom wall 51. The axial direction of the peripheral wall 52 coincides with the axial direction A of the rotating shaft 11. The open end of the peripheral wall 52 is connected to an end surface of the fixed substrate 61a located on the opposite side of the fixed spiral wall 61b. A discharge port 50a is formed on the peripheral wall 52 of the discharge housing 50. The discharge port 50a penetrates the peripheral wall 52 in the thickness direction. The compressed air discharged from the discharge hole 61d of the fixed scroll 61 is discharged from the inside of the discharge housing 50 to the outside of the electric compressor 1 via the discharge port 50a. As shown in FIG. 1, the front housing 40, the fixed scroll 61, and the discharge housing 50 laminated in the axial direction A of the rotating shaft 11 are fixed to the first end portion 20a of the motor housing 20 by a plurality of bolts 85. There is. Each of the plurality of bolts 85 is screwed into each of the plurality of bolt holes 20c shown in FIG.

As shown in FIGS. 2 and 3, the motor accommodating chamber 80 and the inverter accommodating chamber 91 are arranged so as to be aligned in the radial direction of the rotating shaft 11. The inverter accommodating chamber 91 is formed so as to extend in the axial direction A of the rotating shaft 11. The filter accommodating chamber 92 is arranged so as to be aligned with the motor accommodating chamber 80 while communicating with the inverter accommodating chamber 91 near the second end 11b of the rotating shaft 11 in the axial direction A of the rotating shaft 11.

The direction in which the motor accommodating chamber 80 and the inverter accommodating chamber 91 are lined up is defined as the juxtaposed direction B, and the direction orthogonal to the axial direction A of the rotating shaft 11 and also orthogonal to the juxtaposed direction B is defined as the extension direction C. The motor wiring accommodating chamber 82 extends from the motor accommodating chamber 80 in one direction of the extension direction C and communicates with the motor accommodating chamber 80. The extension direction C is one direction orthogonal to the axial direction of the first accommodating portion 22.

As shown in FIGS. 1 and 2, the inverter accommodating chamber 91 has an accommodating main body portion 91a and an extension portion 91b. The accommodating main body 91a is arranged so as to line up with the motor accommodating chamber 80 in the parallel direction B. The accommodating main body portion 91a is a space sandwiched between the main body wall portion 25c and the cover 30. The extension portion 91b extends in one direction of the extension direction C from the accommodation main body portion 91a. The extension portion 91b is a space sandwiched between the first extension wall portion 25d and the cover 30. The filter accommodating chamber 92 extends in one direction of the extension direction C so as to communicate with the extension portion 91b.

The housing 10 is formed with an introduction port 94 and an input / output port 95. The introduction port 94 is formed by being surrounded by the first notch groove 27 and the cover 30. The introduction port 94 is formed in a wall portion of the peripheral wall 26b, which is a wall portion forming the filter accommodating chamber 92, facing the protruding wall portion 25f forming the partition wall in the axial direction A of the rotating shaft 11. The introduction port 94 communicates the outside of the housing 10 with the inside of the filter accommodating chamber 92.

The input / output port 95 is formed by being surrounded by the second notch groove 28 and the cover 30. The input / output port 95 is introduced with a communication line CL for communicating between the inverter 100, which will be described later, and a control device (not shown) for controlling the operation of the inverter 100. The communication line CL introduced in the input / output port 95 is introduced into the accommodation main body 91a of the inverter accommodation chamber 91.

As shown in FIGS. 2 and 5, the connection wiring accommodation chamber 93 is a space sandwiched between the second extending wall portion 25e and the cover 30. The connection wiring accommodating chamber 93 projects from the extension portion 91b of the inverter accommodating chamber 91 in the axial direction A of the rotating shaft 11. The connection wiring accommodating chamber 93 communicates with the extension portion 91b in the axial direction A of the rotating shaft 11. The connection wiring accommodating chamber 93 is arranged so as to be aligned with the compression portion 60 in the extending direction C when the inverter accommodating chamber 91 is viewed from the front in the parallel arrangement direction B. In the axial direction A of the rotating shaft 11, the amount of protrusion of the connection wiring accommodating chamber 93 from the motor housing 20 is smaller than the amount of protrusion of the front housing 40, the compression portion 60, and the discharge housing 50 from the motor housing 20.

As shown in FIG. 5, the electric compressor 1 includes a conductive pin 96 and a connector 97. The conductive pin 96 is provided in the through hole 251 formed in the first extending wall portion 25d. The conductive pin 96 has three terminal portions 96a. The three terminal portions 96a have a columnar shape. As shown in FIGS. 4 and 5, both ends of each of the three terminal portions 96a extend to the extension portion 91b and the motor wiring accommodation chamber 82. The conductive pin 96 is fixed to the bottom wall 25a with, for example, a bolt in a state where the extending portion 91b of the inverter accommodating chamber 91 and the motor wiring accommodating chamber 82 are sealed. The conductive pin 96 penetrates the first extending wall portion 25d forming the partition wall.

As shown in FIGS. 3 and 4, the electric compressor 1 includes a motor wiring 98. The motor wiring 98 electrically connects one end of each of the three terminal portions 96a of the conductive pin 96 to the coil end 13c of the electric motor 12 in the motor wiring accommodation chamber 82. That is, one end of the conductive pin 96 is electrically connected to the electric motor 12.

As shown in FIG. 5, the connector 97 is housed in the inverter storage chamber 91. The connector 97 is connected to the other end of each of the three terminal portions 96a of the conductive pin 96. The other end of each of the three terminal portions 96a is electrically connected to the input end portion of the connector 97. The input end of the connector 97 is located inside the extension 91b, and the output end of the connector 97 is located inside the connection wiring accommodation chamber 93. The connector 97 is arranged so as to straddle the boundary between the first extending wall portion 25d and the second extending wall portion 25e. The height of the connector 97 from the first extending wall portion 25d and the second extending wall portion 25e is higher than the height of the end portion of the fixed support portion 20e.

As shown in FIG. 5, the electric compressor 1 includes three connection wirings 99 as wirings and an inverter 100 for driving the electric motor 12. The inverter 100 has a plurality of switching elements 101, a filter element 102, and a circuit board 103 on which the switching element 101 and the filter element 102 are mounted.

The inverter 100 is housed in the inverter accommodating chamber 91 and the filter accommodating chamber 92. The circuit board 103 has a flat plate shape. The circuit board 103 is arranged in the inverter accommodating chamber 91 along the main body wall portion 25c, the first extending wall portion 25d, and the protruding wall portion 25f forming the partition wall. Further, the circuit board 103 is housed in the inverter accommodating chamber 91 so as to face the main body wall portion 25c, the first extending wall portion 25d, and the protruding wall portion 25f forming the partition wall. The circuit board 103 is arranged in the accommodating main body portion 91a, the extending portion 91b, and the filter accommodating chamber 92 so as to extend in the axial direction A of the rotating shaft 11. The circuit board 103 does not extend into the connection wiring accommodation chamber 93. The outer edge of the circuit board 103 has a shape along the inner surface of the second end portion 20b of the motor housing 20. The circuit board 103 is mounted on a plurality of fixed support portions 20e provided on the inner side surface of the second end portion 20b of the motor housing 20. The circuit board 103 is fixed to the fixed support portions 20e by bolts or the like which are fastening members (not shown) in a state where the circuit board 103 is mounted on the plurality of fixed support portions 20e. The fastening member is screwed into the bolt hole 20f of the fixed support portion 20e. At the outer edge of the circuit board 103, a portion corresponding to the boundary between the first extending wall portion 25d and the second extending wall portion 25e is formed so as to avoid the connector 97. That is, the circuit board 103 is formed so that a part of the outer edge of the circuit board 103 avoids interference with the connector 97.

As shown in FIGS. 5 and 6, the plurality of switching elements 101 are arranged on the lower surface 103b of the circuit board 103 facing the protruding wall portion 25f. The plurality of switching elements 101 are arranged at a position where the communication passage 24 extends in the protruding wall portion 25f and a position corresponding to the coil end accommodating portion 81a of the motor accommodating chamber 80 in the protruding wall portion 25f. The plurality of switching elements 101 are arranged side by side while being in thermal contact with the protruding wall portion 25f.

The main body wall portion 25c, the first extending wall portion 25d, and the protruding wall portion 25f forming the partition wall are the air in the motor accommodating chamber 80 after passing through the communication passage 24 and before passing through the electric motor 12. Is cooled by. The protruding wall portion 25f is also cooled by the air flowing in the communication passage 24. Therefore, the plurality of switching elements 101 are also cooled by the air flowing in the communication passage 24 and by cooling the protruding wall portion 25f by the refrigerant after passing through the communication passage 24.

As shown in FIGS. 5 and 7, the filter element 102 is housed in the filter storage chamber 92. The filter element 102 is arranged on the lower surface 103b of the circuit board 103 at a portion where the first bottom wall 261 and the second bottom wall 262 forming the filter accommodating chamber 92 face each other.

The first bottom wall 261, the second bottom wall 262, and the third bottom wall 263, which are the walls of the filter accommodating chamber 92 facing the circuit board 103 in the parallel arrangement direction B, gradually move toward one direction of the extension direction C. It is formed so that the depth from the circuit board 103 becomes shallow.

The filter element 102 is composed of a capacitor 102a as a first component and a coil 102b as a second component. The capacitor 102a and the coil 102b are electronic components forming a smoothing circuit mounted on the inverter 100. That is, the filter element 102 has a function of reducing noise included in the input current. The capacitor 102a and the coil 102b project from the lower surface 103b of the circuit board 103. The height of the capacitor 102a from the circuit board 103 is higher than the height of the coil 102b from the circuit board 103. That is, among the capacitor 102a and the coil 102b protruding from the circuit board 103, the capacitor 102a is an electronic component having the highest height from the circuit board 103. Further, among the capacitor 102a and the coil 102b protruding from the circuit board 103, the coil 102b is an electronic component whose height from the circuit board 103 is lower than that of the capacitor 102a.

The capacitor 102a is arranged on the lower surface 103b of the circuit board 103 at a portion facing the first bottom wall 261. The capacitor 102a is housed in the filter accommodating chamber 92 so as to be arranged on the axis of the rotating shaft 11. The coil 102b is arranged on the lower surface 103b of the circuit board 103 at a portion facing the second bottom wall 262. The coil 102b is located in one direction of the extension direction C with respect to the capacitor 102a, and is housed in the filter accommodating chamber 92 so as to be aligned with the capacitor 102a. That is, the capacitor 102a and the coil 1
02b is housed in the filter accommodating chamber 92 so that the height from the circuit board 103 becomes lower toward one direction of the extension direction C. As shown in FIGS. 4, 5 and 7, the filter element 102 is in thermal contact with the filter accommodating chamber partition wall formed by the bottom walls 22a and 23a and the protruding wall portion 25f. The bottom walls 22a and 23a and the protruding wall portion 25f forming the filter accommodating chamber partition wall are cooled by the air in the motor accommodating chamber 80 after passing through the communication passage 24 and before passing through the electric motor 12. That is, the filter element 102 is cooled by the bottom walls 22a and 23a and the protruding wall portion 25f.

As shown in FIG. 5, the circuit board 103 has a high voltage region S1 and a low voltage region S2. The high voltage region S1 is a region of the circuit board 103 on the filter accommodating chamber 92 side from the portion facing the protruding wall portion 25f. A plurality of switching elements 101 and a filter element 102 are mounted in the high voltage region S1. Further, the positive electrode wiring PL1 and the negative electrode wiring PL2 are electrically connected to the high voltage region S1 as input wiring introduced from the introduction port 94. The positive electrode wiring PL1 and the negative electrode wiring PL2 are wirings that electrically connect the external power supply and the circuit board 103. The positive electrode wiring PL1 and the negative electrode wiring PL2 are electrically connected to positions facing the introduction port 94 in the edge portion of the circuit board 103. The high voltage region S1 is a region to which electric power from an external power source is supplied.

The low voltage region S2 is a region of the circuit board 103 facing the main body wall portion 25c. The low voltage region S2 is a region in which a circuit for controlling the operation of a plurality of switching elements 101 arranged in the high voltage region S1 is arranged. A communication line CL introduced from the input / output port 95 is electrically connected to the low voltage region S2.

A connection region S3 to which one end of the three connection wirings 99 is connected is formed in a portion of the circuit board 103 facing the first extending wall portion 25d. The connection region S3 is adjacent to the high voltage region S1 in the axial direction A of the rotating shaft 11. The connection region S3 is adjacent to the low voltage region S2 in the extension direction C. In the connection region S3, one end of each of the three connection wirings 99 is connected to the upper surface 103a located on the side opposite to the lower surface 103b of the circuit board 103. One end of each of the three connection wires 99 is directly screwed onto a pattern (not shown) formed on the circuit board 103. The upper surface 103a of the circuit board 103 is a surface of the circuit board 103 located on the opposite side of the motor accommodating chamber 80.

The three connection wirings 99 are bendable wirings. The three connection wirings 99 extend from the connection area S3 toward the connection wiring accommodation chamber 93. The three connection wirings 99 are folded back inside the connection wiring accommodation chamber 93 and extend toward the connector 97. The other end of each of the three connection wires 99 is electrically connected to the output end of the connector 97. Three connecting wires 99 are electrically connected to the conductive pin 96 via the connector 97. Therefore, the connector 97 is electrically connected to the circuit board 103 via the three connection wirings 99. The three connection wirings 99 electrically connect the circuit board 103 and the conductive pin 96. In the connection wiring accommodation chamber 93, three connection wirings 99 extending from the circuit board 103 are accommodated in a bent state. In the connection wiring accommodation chamber 93, the three connection wirings 99 are fixed to the second extending wall portion 25e in a state of being gathered by the two fixing clips 93a.

Here, when the inverter accommodating chamber 91 is viewed from the front, the region of the main body wall portion 25c and the protruding wall portion 25f where the motor chamber 81 is projected is formed by the air introduced into the motor accommodating chamber 80 via the communication passage 24. It is cooled. Further, when the inverter accommodating chamber 91 is viewed from the front, the region of the main body wall portion 25c and the first extended wall portion 25d on which the motor wiring accommodating chamber 82 is projected is introduced into the motor accommodating chamber 80 via the communication passage 24. It is cooled by the air. Therefore, in the main body wall portion 25c, the first extending wall portion 25d, and the protruding wall portion 25f forming the partition wall, the surface opposite to the motor accommodating chamber 80 is defined as the cooling region S4. Therefore, the circuit board 103 and the connector 9
7 is arranged so as to face the cooling region S4. The second extending wall portion 25e is out of the cooling region S4. Since the three connection wirings 99 are housed in the connection wiring storage chamber 93, it can be said that the three connection wirings 99 are arranged so as to be separated from the cooling region S4.

As shown in FIG. 5, the electric compressor 1 configured as described above switches the power supplied from the positive wiring PL1 and the negative negative wiring PL2 to the high voltage region S1 of the circuit board 103 by the switching operation of the plurality of switching elements 101. Is converted into three-phase AC power and supplied to the conductive pin 96 via the three connection wirings 99. The switching operation of the plurality of switching elements 101 is controlled by operating the circuit provided in the low voltage region S2 based on the signal input from the communication line CL to the low voltage region S2. Then, as shown in FIG. 4, the three-phase AC power supplied to the conductive pin 96 is supplied to the coil end 13c of the electric motor 12 via the motor wiring 98 to drive the electric motor 12. The rotating shaft 11 rotates with the driving of the electric motor 12, and the compression unit 60 is driven by the rotation of the rotating shaft 11, so that the air sucked into the motor accommodating chamber 80 is compressed by the compression unit 60. The air compressed by the compression unit 60 is discharged from the discharge port 50a of the discharge housing 50.

The operation of this embodiment will be described.
Since the communication passage 24 for supplying the refrigerant to the electric motor 12 and the compression unit 60 is formed inside the protruding wall portion 25f that forms the partition wall that partitions the motor accommodation chamber 80 and the inverter accommodation chamber 91, the communication passage 24 is connected. The presence of the passage 24 does not interfere with the expansion of the accommodation space of the circuit board 103. Further, since the communication passage 24 extends along the switching element 101 arranged on the protruding wall portion 25f, the switching element 101 is preferentially cooled by the air before obtaining heat from the electric motor 12.

The effect of this embodiment will be described.
(1) The existence of the communication passage 24 does not interfere with the expansion of the accommodation space of the circuit board 103. Further, the switching element 101 can be preferentially cooled by the air before the heat is obtained from the electric motor, and the decrease in reliability can be suppressed.

(2) When the air sucked into the motor accommodating chamber 80 is compressed by the compression unit 60, the air moves over the entire length of the electric motor 12, so that the entire electric motor 12 can be cooled. Therefore, the cooling efficiency of the electric motor 12 can be improved, and the decrease in reliability can be suppressed.

(3) The suction port 21 and the coil end accommodating portion 81a are arranged at the same position in the axial direction A of the rotating shaft 11. Therefore, the region of the protruding wall portion 25f forming the partition wall for cooling the plurality of switching elements 101 can be narrowed in the axial direction A of the rotating shaft 11. Since it is not necessary to make the region for cooling the plurality of switching elements 101 unnecessarily wide in the axial direction A of the rotating shaft 11, it is possible to suppress the increase in size of the electric compressor 1 in the axial direction A of the rotating shaft 11.

(4) Since the circuit board 103 is formed so as to avoid interference with the connector 97, a recess is provided on the outer edge of the circuit board 103. Since the connector 97 is arranged so as to be accommodated in the recess, the circuit board 103 is moved from the motor accommodating chamber 80 so that the electric compressor 1 does not become large in the radial direction due to the presence of the connector 97 and the connector 97 is avoided. Since it is not necessary to shift the inverter 100 significantly, the inverter 100 can be cooled efficiently. Further, by connecting the connector 97 and the circuit board 103 with three connection wirings 99 and arranging the three connection wirings 99 at positions away from the cooling region S4, the arrangement of the three connection wirings 99 that do not require cooling is provided. Therefore, it is not necessary to allocate the cooling region S4, and that portion can be allocated to the cooling of the circuit board 103. Therefore, it is possible to suppress the increase in size while efficiently cooling the inverter 100.

(5) The connection wiring 99 is electrically connected to the upper surface 103a of the circuit board 103. Therefore, since the circuit board 103 can be accommodated in the inverter accommodating chamber 91 and then the connection wiring 99 can be electrically connected to the circuit board 103, the flexibility of wiring arrangement can be further improved.

(6) Since the conductive pin 96 and the circuit board 103 are electrically connected by three connection wirings 99 outside the connector 97 instead of the bus bar inside the connector 97, the electric compressor 1 can be operated in the radial direction even if the flowing current is large. It is difficult to increase the size. Compared to the bus bar, the three connection wirings 99 are difficult to handle in the inverter accommodation chamber 91, which has a limited volume for electrically connecting two specific locations, but three connection wiring accommodation chambers 93 are provided. The connection wiring 99 can be easily routed. The three connection wirings 99 can be connected to the circuit board 103 by screwing or soldering over a wide range, and the flexibility of the three connection wirings 99 themselves causes vibration from the electric motor 12 in a situation where the flowing current is large. The connection point is not easily damaged even if the message is transmitted.

(7) The voltage that can be used by the inverter 100 is limited depending on the application destination of the electric compressor 1. Therefore, studies have been made to realize miniaturization of the electric compressor 1 without changing the output of the electric compressor 1. In order not to change the output of the electric compressor 1, it is necessary to lower the voltage used in the inverter 100 and increase the current flowing through the inverter 100. At this time, since a large current flows through the circuit board 103, the pattern of the circuit board 103 becomes thicker, and as the pattern becomes thicker, the circuit board 103 becomes larger.

According to the present embodiment, since the inverter accommodating chamber 91 is formed so as to extend in the axial direction A of the rotating shaft 11, a circuit is used when the electric compressor 1 is miniaturized without changing the output of the electric compressor 1. Even if the substrate 103 becomes large, the circuit substrate 103 can be extended in the axial direction A of the rotating shaft 11, so that the electric compressor 1 can be easily miniaturized in the radial direction of the rotating shaft 11.

Conductive pins 96 and connection wiring 99 are used as means for electrically connecting the electric motor 12 and the circuit board 103. As a result, when the position of the inverter 100 is changed, the bending condition of the connection wiring 99 can be freely changed, so that the position of the inverter 100 can be easily changed. Therefore, the three connection wirings 99 are flexible.

Here, if the connection wiring 99 extends in the plate thickness direction of the circuit board 103, the inverter accommodating chamber 91 becomes large, so that the connection wiring accommodation chamber 93 is formed. Since the circuit board 103 becomes large when the electric compressor 1 is miniaturized without changing the output of the electric compressor 1, an extension portion 91b of the inverter accommodating chamber 91 is provided, and a circuit board is also provided inside the extension portion 91b. 103 is extended. Then, when the inverter accommodating chamber 91 is viewed from the front in the parallel arrangement direction B, a space is formed at a position aligned with the compression portion 60 in the extension direction C. The connection wiring accommodation chamber 93 is formed so as to protrude from the extension portion 91b in the axial direction A of the rotating shaft 11, and the connection wiring 99 is accommodated in the inside of the connection wiring accommodation chamber 93 in a bent state. There is. That is, the connection wiring accommodation chamber 93 uses the above-mentioned space formed by the extension portion 91b of the inverter accommodation chamber 91 as the accommodation space for the connection wiring 99. Therefore, it is suppressed that the connection wiring 99 extends in the plate thickness direction of the circuit board 103 in the inverter accommodating chamber 91, the unnecessarily large size of the inverter accommodating chamber 91 is suppressed, and the extension portion 91b of the inverter accommodating chamber 91 is suppressed. By forming the connection wiring accommodating chamber 93 in the above-mentioned space formed by the above, it is possible to prevent the electric compressor 1 from becoming large. Therefore, it is possible to facilitate miniaturization while making use of the flexibility of wiring arrangement.

(8) The main body wall portion 25c, the first extending wall portion 25d, the protruding wall portion 25f, and the filter accommodating chamber partition wall forming the partition wall by introducing the refrigerant into the motor accommodating chamber 80 via the communication passage 24. The bottom walls 22a and 23a and the protruding wall portion 25f forming the above are cooled. Therefore, the switching element 101 and the filter element 102 can exchange heat in a multifaceted manner. Therefore, the filter element 102 and the switching element 101 are excellently cooled, and both can be cooled efficiently.

(9) Since the circuit board 103 becomes large when the electric compressor 1 is miniaturized without changing the output of the electric compressor 1, an extension portion 91b of the inverter accommodating chamber 91 is provided inside the extension portion 91b. Also extends the circuit board 103. Then, the filter accommodating chamber 92 extends in one direction of the extension direction C so as to communicate with the extension portion 91b. However, if the filter accommodating chamber 92 is extended in one direction of the extension direction C, the electric compressor 1 may become larger than necessary.

In that respect, in the present embodiment, the first bottom wall 261, the second bottom wall 262, and the third bottom wall 263, which are the wall portions of the filter accommodating chamber 92 facing the circuit board 103 in the parallel arrangement direction B, are extended. It is formed so that the depth from the circuit board 103 becomes shallower toward one direction of the direction C. Therefore, it becomes easier to reduce the size of the filter accommodating chamber 92 toward one direction of the extension direction C. Therefore, the electric compressor 1 can be easily miniaturized.

(10) For example, when the introduction port 94 is provided in the peripheral wall 26b forming the filter accommodating chamber 92 in addition to the wall portion facing the protruding wall portion 25f in the axial direction A of the rotating shaft 11, the positive electrode wiring PL1 and the negative electrode wiring PL2 Is arranged so as to project outward in the radial direction of the rotating shaft 11. Further, for example, it is conceivable that the position where the positive electrode wiring PL1 and the negative electrode wiring PL2 are connected to the circuit board 103 is not the outer edge of the circuit board 103. In this case, if the wiring pattern extends in all directions on the surface of the circuit board 103 from the connection portion between the circuit board 103 and the positive electrode wiring PL1 and the negative electrode wiring PL2 for the purpose of effective utilization of the circuit board 103, the wiring pattern becomes It gets complicated. Then, by using the area of the circuit board 103 more than necessary, the circuit board 103 may become larger than necessary.

In that respect, the introduction port 94 is formed in the peripheral wall 26b forming the filter accommodating chamber 92, which faces the protruding wall portion 25f in the axial direction A of the rotating shaft 11. Further, the positive electrode wiring PL1 and the negative electrode wiring PL2 are connected at positions facing the introduction port 94 on the outer edge of the circuit board 103. Therefore, the circuit pattern formed on the circuit board 103 can be a simple pattern extending toward the connection region S3 of the circuit board 103. That is, since the positive electrode wiring PL1 and the negative electrode wiring PL2 are introduced from the introduction port 94, the circuit pattern of the circuit board 103 can be simplified and an unnecessarily complicated wiring pattern is not formed. Therefore, the circuit board 103 Does not need to be larger than necessary. Therefore, it is possible to suppress an increase in the physique of the electric compressor 1.

The present embodiment can be modified as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
The communication passage 24 may communicate with the coil end accommodating portion 81a formed closer to the compression portion 60 of the two coil end accommodating portions 81a.

○ The suction port 21 and the coil end accommodating portion 81a may be arranged at different positions in the axial direction A of the rotating shaft 11.
○ The plurality of switching elements 101 may be arranged only at a position where the communication passage 24 extends in the protruding wall portion 25f forming the partition wall.

○ The compression unit 60 is not limited to the scroll type, and the configuration may be appropriately changed so that the air sucked into the motor accommodating chamber 80 can be compressed.
○ The application target of the electric compressor 1 and the gas to be compressed are arbitrary. For example, electric compressor 1
May be used in vehicles and air conditioners, and the gas to be compressed may be a refrigerant gas.

Next, the technical idea that can be grasped from the above embodiment and another example will be added below.
(1) The electric compressor according to claim 1 or 2, wherein the suction port and the coil end accommodating portion are arranged at the same position in the axial direction of the rotating shaft.

According to this, the region of the partition wall for cooling the switching element can be narrowed in the axial direction of the rotation axis. Since it is not necessary to make the area for cooling the switching element wider than necessary in the axial direction of the rotating shaft, it is possible to suppress an increase in the size of the electric compressor in the axial direction of the rotating shaft.

1 ... Electric compressor, 10 ... Housing, 11 ... Rotating shaft, 11a ... First end, 11b ... Second end, 12 ... Electric motor, 13c ... Coil end, 21 ... Suction port, 22 ... First Containment part, 22a ... bottom wall, 22b ... peripheral wall, 23 ... second accommodating part, 23a ... bottom wall, 23b ... peripheral wall, 24 ... communication passage, 25 ... third accommodating part, 25a ... bottom wall, 25c ... main body wall part , 25d ... 1st extended wall part, 25f ... protruding wall part, 60 ... compression part, 80 ... motor housing, 81a ... coil end housing, 91 ... inverter housing, 100 ... inverter, 101 ... switching element, 103 ... Circuit board, A ... Axial direction of the rotating shaft.

Claims (2)

An electric motor that rotates the rotating shaft and
An inverter that has a circuit board on which a plurality of switching elements are mounted and that drives the electric motor,
A motor accommodating chamber in which the electric motor is accommodated, an inverter accommodating chamber arranged alongside the motor accommodating chamber in the radial direction of the rotating shaft and accommodating the inverter, and a refrigerant from the outside to the motor accommodating chamber. Introducing a communication path, with a housing,
A compression unit for compressing the refrigerant sucked from the motor accommodating chamber is provided.
The housing has a partition wall that partitions the motor accommodating chamber and the inverter accommodating chamber and extends in the axial direction of the rotating shaft.
The circuit board is an electric compressor arranged in the inverter accommodating chamber along the partition wall.
The partition wall has a protrusion that projects toward the inverter accommodating chamber.
The communication passage is formed inside the protrusion and is formed.
An electric compressor characterized in that the plurality of switching elements are arranged side by side while being in thermal contact with the protruding portion, and are cooled by a refrigerant flowing in the communication passage. The electric motor divides the motor accommodating chamber into two coil end accommodating chambers accommodating coil ends at both ends of the electric motor.
The electric compressor according to claim 1, wherein the communication passage introduces a refrigerant into the coil end accommodating chamber on the side of the two coil end accommodating chambers on the side away from the compression portion.

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