CN111379684A

CN111379684A - Electric compressor

Info

Publication number: CN111379684A
Application number: CN201911278924.7A
Authority: CN
Inventors: 大河内健史; 门间健司
Original assignee: Toyota Industries Corp
Current assignee: Toyota Industries Corp
Priority date: 2018-12-26
Filing date: 2019-12-13
Publication date: 2020-07-07
Also published as: JP2020105932A; DE102019135094A1

Abstract

The invention provides an electric compressor, which comprises a motor shell, a motor mechanism, a compression mechanism, an inverter shell, an inverter, a sealing component, and a 1 st fastening connector and a 2 nd fastening connector. The 1 st fastening connector penetrates the cover member and the shell member in a direction from the cover member to the shell member and is inserted through the 1 st end of the motor shell. The 2 nd fastening link penetrates the protruding portion in a direction from the motor housing toward the cover member and is threadedly engaged with the internal threaded hole. The 1 st and 2 nd fastening members are annularly arranged along the sealing member.

Description

Electric compressor

Technical Field

The present disclosure relates to an electric compressor.

Background

A conventional electric compressor is disclosed in korean patent laid-open publication No. 10-2017-0112405. The electric compressor includes a compression mechanism, a motor mechanism, an inverter, a motor housing, an inverter housing, a sealing member, and a plurality of fastening members.

The compression mechanism compresses a refrigerant. The motor mechanism drives the compression mechanism. The inverter controls driving of the motor mechanism. The motor housing is cylindrical and accommodates (houses) the compression mechanism and the motor mechanism. In addition, a connection terminal connected to the motor mechanism is provided in the motor housing.

The inverter case is constituted by a case member and a cover member. The case member has a bottom wall abutting against the motor case and a peripheral wall rising from a peripheral edge of the bottom wall. The cover member abuts the peripheral wall and forms a housing space for housing the inverter together with the case member. The bottom wall has a through hole through which the connection terminal is inserted. It is considered that a power supply connector for electrically connecting a power supply provided outside the inverter case and the inverter is provided in the inverter case.

The sealing member is annular and is sandwiched between the motor case and the inverter case. The sealing member surrounds the through hole and the connection terminal and prevents foreign matter such as water from flowing into the connection terminal.

In the electric compressor, the motor housing and the inverter housing are arranged along the axial direction of the motor housing. The motor housing and the inverter housing are fastened to each other by fastening members. Specifically, each fastener is inserted through the motor housing so as to pass through the cover member and the housing member in a direction from the cover member toward the motor housing. That is, the cover member and the case member constituting the inverter case are fastened and coupled by the fastening members. In this electric compressor, the motor mechanism in the motor housing and the inverter in the inverter housing are electrically connected to each other through the connection terminal by fastening the motor housing and the inverter housing to each other.

In recent years, further high voltage and large current are required for the electric compressor, and therefore, the size increase of the power connector cannot be avoided. However, in the conventional electric compressor described above, it is difficult to secure a space for installing a large-sized power connector in the peripheral wall of the shell member. Thus, with regard to such a power connector, provision at the bottom wall and/or the cover member is considered.

However, in this case, in order to provide the power connector, the area of the bottom wall and/or the cover member is increased, and the inverter case is increased in size. Therefore, it is difficult to fasten the motor case and the inverter case with sufficient strength by merely inserting the fastening members into the motor case while avoiding the housing space from the cover member in the direction toward the case. Therefore, there is a possibility that a failure in the energization between the motor mechanism and the inverter may occur due to vibration during operation or the like.

In this case, uneven surface pressure is generated in the sealing member, and the sealing member is difficult to suppress the inflow of foreign matter into the connection terminal, and therefore, there is a possibility that a failure in the electrical connection between the motor mechanism and the inverter occurs in this point.

Disclosure of Invention

An object of the present disclosure is to provide an electric compressor capable of satisfying the requirements for higher voltage and larger current and capable of suppressing the occurrence of a power failure between a motor mechanism and an inverter with high reliability.

An electric compressor according to an aspect is characterized by comprising: a compression mechanism for compressing a fluid; a motor mechanism that drives the compression mechanism; an inverter that performs drive control of the motor mechanism; a motor housing having a cylindrical shape and accommodating at least the motor mechanism therein; an inverter case that accommodates the inverter therein; a sealing member having an annular shape and sandwiched between the motor housing and the inverter housing; and a fastening connector that fastens the motor case and the inverter case, wherein a connection terminal electrically connected to the motor mechanism and a protruding portion protruding in a radial direction of the motor case are provided at one end of the motor case, the inverter case includes a case member having a bottom wall facing the one end of the motor case and a peripheral wall rising from a periphery of the bottom wall, and a cover member abutting against the peripheral wall and forming a housing space for housing the inverter together with the case member, the bottom wall is formed with a female screw hole and a through hole through which the connection terminal is inserted, the sealing member surrounds the through hole and the connection terminal, and a power supply connector that electrically connects an external power supply to the inverter is provided at the bottom wall or the cover member, the fastener link has: a 1 st fastening connector which penetrates the cover member and the case member from the cover member side and is inserted into one end of the motor housing; and a 2 nd fastening member that penetrates the protruding portion from the motor housing side and is screwed into the female screw hole, wherein the 1 st fastening member and the 2 nd fastening member are annularly arranged along the sealing member.

Drawings

Fig. 1 is an exploded perspective view illustrating an electric compressor according to an embodiment.

Fig. 2 is an exploded perspective view showing the electric compressor.

Fig. 3 is a perspective view showing the inverter housing and the inverter relating to the electric compressor.

Fig. 4 is a sectional view showing the motor-driven compressor.

Fig. 5 is a sectional view showing a section a-a of fig. 4 relating to the motor-driven compressor.

Detailed Description

Hereinafter, an embodiment will be described with reference to the drawings. The electric compressor according to one embodiment is mounted on a vehicle, not shown, and constitutes a refrigeration circuit of the vehicle.

As shown in fig. 1 to 3, the electric compressor includes a motor housing 1, a motor mechanism 3, a compression mechanism 5, an inverter housing 7, an inverter 9, 1 st fastening bolts 11a to 11d, 2

nd fastening bolts

13a and 13b, 3 rd fastening bolts 15a to 15e, and a washer 16. The 1 st fastening bolts 11a to 11d are an example of the "1 st fastening member". The 2

nd fastening bolts

13a and 13b are an example of the "2 nd fastening member". The 1 st fastening bolts 11a to 11d and the 2

nd fastening bolts

13a and 13b constitute a "fastening member". The gasket 16 is an example of a "sealing member".

As shown in fig. 1, in the present embodiment, the front-rear direction of the electric compressor is defined by defining the side where the motor housing 1 is located as the front side of the electric compressor and the side where the inverter housing 7 is located as the rear side of the electric compressor. In fig. 1, the vertical direction of the electric compressor is defined, and the horizontal direction, which is the width direction, is defined. In fig. 2 and later, the front-rear direction, the up-down direction, and the left-right direction are defined in correspondence with fig. 1. The above directions are examples for convenience of explanation, and the electric compressor may be appropriately changed in posture according to a vehicle or the like to be mounted thereon.

As shown in fig. 1 and 2, the motor case 1 is made of aluminum alloy. The motor housing 1 has a housing main body 1a, a 1 st mounting flange 1b, and a 2 nd mounting flange 1 c. The motor case 1 may be formed of a material other than aluminum alloy.

The housing main body 1a has a standing wall 110 and a side wall 111. The standing wall 110 is located at the rear end of the housing main body 1a, that is, the rear end of the motor housing 1, and extends in the radial direction of the motor housing 1. The rear end of the motor housing 1 is an example of "the 1 st end of the motor housing". The side wall 111 is continuous with the standing wall 110, and extends forward from the standing wall 110 in the axial direction of the motor housing 1. The case body 1a is formed in a bottomed cylindrical shape having a front side opened by the upright wall 110 and the side wall 111.

As shown in fig. 2, the connection terminal 17 is provided on the vertical wall 110. The connection terminal 17 includes an external terminal portion 17a exposed to the outside of the upright wall 110 and protruding rearward of the upright wall 110, and an internal terminal portion (not shown) extending in the housing main body 1 a. The side wall 111 is integrally provided with

fixing portions

19a and 19 b. The

fixing portions

19a and 19b fix the motor housing 1, and thus the electric compressor, to the vehicle. The number and shape of the

fixing portions

19a and 19b can be designed as appropriate.

As shown in fig. 1, a suction port 112 is provided in the side wall 111. That is, the motor housing 1 is provided with a suction port 112 for sucking fluid into the interior. The low-temperature refrigerant having passed through the evaporator (not shown) is sucked into the casing main body 1a through the suction port 112. The refrigerant is an example of a "fluid".

As shown in fig. 4, the 1 st mounting flange 1b is integrally formed on the housing main body 1a and is located at the rear end of the motor housing 1. The 1 st mounting flange 1b has a main body portion 113 and protruding

portions

114, 115. The body portion 113 is connected to the side wall 111 and extends further outward in the radial direction of the motor housing 1 than the housing body 1 a.

The body 113 has 41 st female screw holes 21a to 21d formed therein. The 1 st female screw holes 21a to 21d are through which the 1 st fastening bolts 11a to 11d can be inserted and threadedly engaged with the 1 st fastening bolts 11a to 11 d. The 1 st female screw holes 21a to 21d are annularly arranged below the body 113.

The protruding

portions

114, 115 are integrally formed on the main body portion 113. The protruding

portions

114 and 115 are disposed at a predetermined interval in the left-right direction and on the upper side of the body portion 113. The protruding

portions

114 and 115 protrude outward in the radial direction of the motor housing 1 from the body portion 113. As shown in fig. 1 and 2, the projection 114 has a 1 st insertion hole 23a, and the projection 115 has a 1 st insertion hole 23 b. The 1

st insertion holes

23a and 23b penetrate the protruding

portions

114 and 115, respectively. The 1

st insertion holes

23a and 23b allow insertion of the 2

nd fastening bolts

13a and 13b, respectively. The 1 st female screw holes 21a to 21d and the 1

st insertion holes

23a and 23b can be designed appropriately according to the number of the 1 st fastening bolts 11a to 11d and the 2

nd fastening bolts

13a and 13b, respectively.

The 2 nd mounting flange 1c is integrally formed on the housing main body 1a and is located at the front end of the motor housing 1. The 2 nd mounting flange 1c is connected to the side wall 111 and extends further outward in the radial direction of the motor housing 1 than the housing main body 1 a. The cover is fixed to the 2 nd mounting flange 1 c. The cover closes the front end of the housing main body 1a, and forms a discharge chamber with the compression mechanism 5. The hood has a discharge port.

Note that illustration of the cover, the discharge chamber, and the discharge port is omitted.

The motor mechanism 3 is housed in the case body 1 a. The motor mechanism 3 includes components such as a stator and a rotor. A drive shaft 25 is attached to the motor mechanism 3. The motor mechanism 3 is connected to the internal terminal portion of the connection terminal 17 in a state of being housed in the case body 1 a. Thereby, the motor mechanism 3 and the connection terminal 17 are electrically connected.

The compression mechanism 5 is housed in the casing body 1a and is disposed on the front side of the motor mechanism 3. As the compression mechanism 5, a known scroll-type compression mechanism is used. The compression mechanism 5 includes a fixed scroll fixed to the inner peripheral surface of the side wall 111, and a movable scroll disposed to face the fixed scroll. The movable scroll is connected to a drive shaft 25 so as to be capable of power transmission, and can be rotated by the drive shaft 25. The fixed scroll engages the movable scroll and defines a compression chamber therebetween. The fixed scroll, the movable scroll, and the compression chamber are not shown. Further, as the compression mechanism 5, another type of compression mechanism such as a vane type compression mechanism may be used.

The inverter case 7 is disposed behind the motor case 1. The inverter case 7 is made of aluminum alloy. The inverter housing 7 is constituted by a case member 71 and a cover member 73. The inverter case 7 has a substantially rectangular box shape independent of the motor case 1 by the case member 71 and the cover member 73. The inverter case 7 may be formed of a material other than aluminum alloy.

As shown in fig. 1, the case member 71 constitutes a front side portion of the inverter housing 7. The case member 71 has a 1 st bottom wall 71a and a 1 st peripheral wall 71 b. The 1 st bottom wall 71a is an example of a "bottom wall", and the 1 st peripheral wall 71b is an example of a "peripheral wall". The 1 st bottom wall 71a is located at the front end of the case member 71, further, at the front end of the inverter housing 7, and is opposed to the rear end of the motor housing 1. The lower portion of the 1 st bottom wall 71a is substantially circular along the housing main body 1a, and the upper portion of the 1 st bottom wall 71a is rectangular. The 1 st bottom wall 71a has a fixed base 710 and a through hole 711. The fixed base 710 is formed in the upper right portion in the 1 st bottom wall 71a, and protrudes toward the front from the 1 st bottom wall 71 a. As shown in fig. 5, a guide path 710a is formed in the fixed base 710. The guide passage 710a penetrates the fixed base 710 in the front-rear direction, and further penetrates the 1 st bottom wall 71a in the front-rear direction.

The power supply connector 29 is fixed to the fixing base 710 by a plurality of mounting screws 27. That is, in the electric compressor, the power connector 29 is provided on the 1 st bottom wall 71 a. The power connector 29 protrudes forward from the fixed base 710, i.e., the 1 st bottom wall 71 a. As shown in fig. 4, the power connector 29 is electrically connected to a battery 33 of the vehicle provided outside the inverter housing 7 through a power cable 31. Thus, power is supplied from battery 33 to inverter 9 through power supply connector 29. The battery 33 is an example of "external power supply". Here, the electric compressor employs the power connector 29 which is enlarged in size in response to an increase in voltage and an increase in current. Specifically, the power connector 29 is configured to have a size capable of connecting the power cable 31 corresponding to a voltage of about 800 volts. The shape of the power connector 29 can be appropriately designed according to the size of the power cable 31, in addition to the required voltage and current.

As shown in fig. 1, the through hole 711 is formed in the lower left portion of the 1 st bottom wall 71a, penetrating the 1 st bottom wall 71a in the front-rear direction. The through hole 711 can accommodate therein the connection terminal 17 shown in fig. 2. The through hole 711 is formed at the position of the 1 st bottom wall 71a, and the shape of the through hole 711 can be appropriately designed according to the connection terminal 17.

As shown in fig. 4, the communication connector 35 is provided on the 1 st bottom wall 71 a. More specifically, the communication connector 35 is fixed to the upper left portion of the 1 st bottom wall 71a by a plurality of mounting screws 37. That is, in the electric compressor, the power connector 29 and the communication connector 35 are disposed adjacent to each other with a predetermined gap in the left-right direction of the 1 st bottom wall 71 a. The communication connector 35 is electrically connected to a control device 41 of the vehicle provided outside the inverter case 7 through a communication cable 39. Thereby, a control signal is transmitted from the control device 41 to the inverter 9 through the communication connector 35. The control device 41 is an example of an "external control device". Further, the shape of the communication connector 35 can be designed appropriately.

As shown in fig. 3 and 5, the 1 st bottom wall 71a is formed with fixing seats 714a to 714e in addition to the 1 st boss 712 and the 2 nd boss 713 formed integrally therewith. The 1 st projection 712 and the 2 nd projection 713 are examples of "projections". As shown in fig. 5, the 1 st boss 712 is disposed at a position corresponding to the projection 114 of the 1 st mounting flange 1b on the 1 st bottom wall 71 a. As shown in fig. 3, the 2 nd boss 713 is disposed at the 1 st bottom wall 71a at a position corresponding to the projection 115 of the 1 st mounting flange 1b shown in fig. 1. That is, as shown in fig. 3, the 1 st boss 712 and the 2 nd boss 713 are arranged with a predetermined interval provided in the left-right direction of the 1 st bottom wall 71 a.

As shown in fig. 5, the 1 st boss 712 protrudes rearward from the 1 st bottom wall 71 a. Similarly, the 2 nd boss 713 also protrudes rearward from the 1 st bottom wall 71 a. That is, the 1 st boss 712 and the 2 nd boss 713 protrude from the 1 st bottom wall 71a toward the 2 nd bottom wall 73a of the cover member 73, which will be described later. The 1 st boss 712 has a 2 nd female screw hole 43a in the inside thereof. The 2 nd female screw hole 43a extends in the front-rear direction in the 1 st boss 712, and the tip thereof opens at the 1 st bottom wall 71 a. Here, the 2 nd female screw hole 43a does not penetrate the 1 st boss 712 in the front-rear direction. Therefore, the rear end of the 2 nd female screw hole 43a is positioned in the 1 st boss 712. Similarly, a 2 nd female screw hole 43b is formed in the 2 nd boss 713. As shown in fig. 1, the tip of the 2 nd female screw hole 43b opens at the 1 st bottom wall 71 a. The 2 nd

female screw holes

43a and 43b are respectively through which the 2

nd fastening bolts

13a and 13b can be inserted and are threadedly engaged with the 2

nd fastening bolts

13a and 13 b. The 2 nd

female screw holes

43a and 43b are examples of "female screw holes".

As shown in fig. 3, the fixing seats 714a to 714e are disposed on the 1 st bottom wall 71a on the outer peripheral side of the 1 st and 2

nd bosses

712 and 713. The fixing seats 714a to 714e protrude rearward from the 1 st bottom wall 71 a. The fixing seat portions 714a to 714e are respectively formed with screw grooves into which the mounting screws 45a to 45e can be inserted and which can fix the mounting screws 45a to 45 e. The number of the fixing seats 714a to 714e can be appropriately designed.

As shown in fig. 1, the 1 st peripheral wall 71b is connected to the peripheral edge of the 1 st bottom wall 71a, and surrounds the 1 st bottom wall 71 a. The 1 st peripheral wall 71b is erected rearward from the 1 st bottom wall 71 a.

As shown in fig. 3, the 1 st peripheral wall 71b has 2 nd insertion holes 47a to 47d and 3 rd female screw holes 49a to 49 e. The 2 nd insertion holes 47a to 47d penetrate the 1 st peripheral wall 71b and the 1 st bottom wall 71a in the front-rear direction, and are open in the 1 st bottom wall 71 a. The 1 st fastening bolts 11a to 11d can be inserted through the 2 nd insertion holes 47a to 47 d. As shown in fig. 1, the 2 nd insertion holes 47a to 47d are annularly arranged on the lower side of the case member 71 so as to extend along the gasket 16. The 3 rd female screw holes 49a to 49e shown in fig. 3 extend in the front-rear direction in the 1 st peripheral wall 71b and the 1 st bottom wall 71 a. The 3 rd female screw holes 49a to 49e are disposed on the upper side of the 2 nd insertion holes 47a to 47d in the case member 71. The 3 rd female screw holes 49a to 49e do not penetrate the 1 st bottom wall 71a unlike the 2 nd insertion holes 47a to 47 d. The 3 rd female screw holes 49a to 49e are respectively through which the 3 rd fastening bolts 15a to 15e can be inserted and threadedly engaged with the 3 rd fastening bolts 15a to 15 e.

The 1 st peripheral wall 71b is provided with the 1 st and 2 nd fitting pins 51a and 51 b. The 1 st and 2 nd fitting pins 51a and 51b are fixed to the 1 st peripheral wall 71b in a state where a part thereof is embedded in the 1 st peripheral wall 71 b. The 1 st and 2 nd fitting pins 51a and 51b extend from the 1 st peripheral wall 71b toward the rear of the electric compressor. That is, the 1 st and 2 nd fitting pins 51a and 51b extend from the 1 st peripheral wall 71b toward the 2 nd peripheral wall 73b of the cover member 73, which will be described later. The number and shape of the 1 st and 2 nd fitting pins 51a and 51b can be appropriately designed.

As shown in fig. 2, the cover member 73 constitutes a rear side portion of the inverter housing 7. The cover member 73 has a 2 nd bottom wall 73a and a 2 nd peripheral wall 73 b. The 2 nd bottom wall 73a is located at the rear end of the cover member 73, and further, at the rear end of the inverter housing 7. The 2 nd bottom wall 73a is formed in a shape corresponding to the 1 st bottom wall 71 a. That is, the 2 nd bottom wall 73a has a lower portion along the substantially circular shape of the case main body 1a and an upper portion having a rectangular shape.

The 2 nd peripheral wall 73b is connected to the peripheral edge of the 2 nd bottom wall 73a, and surrounds the 2 nd bottom wall 73 a. The 2 nd peripheral wall 73b is erected from the 2 nd bottom wall 73a toward the 1 st peripheral wall 71 b.

As shown in fig. 2, the 2 nd bottom wall 73a and the 2 nd peripheral wall 73b are formed with 3 rd insertion holes 53a to 53d and 4 th insertion holes 55a to 55 e. The 3 rd insertion holes 53a to 53d and the 4 th insertion holes 55a to 55e are opened in the 2 nd bottom wall 73a, and penetrate the 2 nd bottom wall 73a and the 2 nd peripheral wall 73b in the front-rear direction. A recess 730 is formed in the 2 nd bottom wall 73a at a portion around the 3 rd insertion holes 53a to 53d and the 4 th insertion holes 55a to 55 e. In addition, fitting recesses (not shown) capable of fitting the 1 st and 2 nd fitting pins 51a and 51b are formed in the 2 nd peripheral wall 73 b.

As shown in fig. 3, the inverter 9 includes a circuit board 91, a conversion circuit 93, a filter circuit 95, a power supply unit 97, and a connection-receiving terminal 99. In fig. 3, the circuit board 91 is illustrated in phantom lines for ease of explanation.

As shown in fig. 5, the circuit board 91 is formed in a substantially rectangular plate shape having a front surface 91a and a rear surface 91 b. As shown in fig. 3, the circuit board 91 is connected to a communication connector 35.

The conversion circuit 93 converts an alternating current into a direct current. The conversion circuit 93 is connected to the circuit board 91 and is located in a region facing the front surface 91 a. More specifically, as shown in fig. 3, the conversion circuit 93 is disposed in a region facing the front surface 91a and below the filter circuit 95.

The filter circuit 95 shown in fig. 3 removes noise generated in operation. The filter circuit 95 includes a 1 st capacitor 95a, a 2 nd capacitor 95b, and a coil 95 c. The 1 st and 2

nd capacitors

95a and 95b and the coil 95c are connected to the circuit board 91, respectively, and are located in a region facing the front surface 91a and above the inverter circuit 93. More specifically, 1 st capacitor 95a is disposed in a region facing front surface 91a and at a position below 1 st boss 712 when inverter 9 is fixed to case member 71. Second capacitor 95b is disposed in a region facing front surface 91a and at a position between first boss 712 and second boss 713 when inverter 9 is fixed to case member 71. That is, the 2 nd capacitor 95b is located on the left side of the 1 st capacitor 95a and the 1 st bump 712. The coil 95c is disposed above the 2 nd capacitor 95b, i.e., above the 1 st boss 712 and the 2 nd boss 713 when the inverter 9 is fixed to the case member 71. In this way, the filter circuit 95 is disposed at a position avoiding the 1 st projection 712 and the 2 nd projection 713 on the circuit board 91.

The power supply assembly 97 is connected to the battery 33 through the power connector 29. The power feeding unit 97 includes bus bars 97a and 97b, fixing

screws

97c and 97d, a holder 97e, and an insulating resin 97f shown in fig. 5. As shown in fig. 3, the bus bars 97a, 97b are disposed in a region facing the front surface 91a of the circuit board 91. As shown in fig. 5, the 1 st end, which is one end of the bus bar 97a, is connected to the circuit board 91, and the 2 nd end, which is the other end of the bus bar 97a, extends into the power connector 29 through the guide path 710a of the 1 st bottom wall 71 a. The bus bar 97b shown in fig. 3 also has the same configuration as the bus bar 97 a. The bus bars 97a, 97b are fixed to the holder 97e by fixing

screws

97c, 97d, respectively. As shown in fig. 5, insulating resin 97f is provided in power supply connector 29, and 2 nd ends of bus bars 97a and 97b are inserted therethrough. Further, the configuration of the power supply unit 97 can be designed appropriately.

The connected terminal 99 shown in fig. 3 can be connected to the connecting terminal 17 shown in fig. 2. The connection-target terminals 99 are located in a region facing the front surface 91a, and are connected to the circuit board 91 by a connection cable not shown. In this way, the connection-target terminal 99 is disposed on the left side of the conversion circuit 93 in the region facing the front surface 91 a.

The inverter 9 is fixed to the case member 71 by fixing the circuit board 91 to the fixing seats 714a to 714e with the mounting screws 45a to 45 e. At this time, as shown in fig. 5, in the inverter 9, the front surface 91a of the circuit board 91 is directed toward the 1 st bottom wall 71 a. Thus, the conversion circuit 93, the filter circuit 95, the power feeding unit 97, and the connection-receiving terminals 99 are located between the 1 st bottom wall 71a and the circuit board 91, respectively. As described above, the filter circuit 95 is disposed on the circuit board 91 at a position avoiding the 1 st projection 712 and the 2 nd projection 713. Therefore, when the inverter 9 is fixed to the case member 71, the filter circuit 95, i.e., the 1 st and 2

nd capacitors

95a and 95b and the coil 95c do not interfere with the 1 st boss 712 and the 2 nd boss 713. Further, by fixing the inverter 9 to the case member 71, as shown in fig. 1, the connection-receiving terminal 99 faces the through hole 711. Then, the connected terminal 99 passes through the through hole 711 and faces the outside of the inverter case 7.

In this way, in a state where the inverter 9 is fixed to the case member 71, the 1 st and 2 nd fitting pins 51a and 51b of the case member 71 are fitted in the fitting recesses (not shown) of the cover member 73. Thereby, the 1 st peripheral wall 71b abuts the 2 nd peripheral wall 73b, and the case member 71 and the cover member 73 are positioned. In addition, the 3 rd female screw holes 49a to 49e of the case member 71 are aligned with the corresponding 4 th insertion holes 55a to 55e of the cover member 73. The 2 nd insertion holes 47a to 47d of the case member 71 are aligned with the corresponding 3 rd insertion holes 53a to 53d of the cover member 73.

As shown in fig. 2, the 3 rd fastening bolt 15a is inserted into the 4 th insertion hole 55a in the direction from the 2 nd bottom wall 73a toward the motor housing 1, whereby the 3 rd fastening bolt 15a is screwed into the 3 rd female screw hole 49a and fixed. Similarly, the 3 rd fastening bolts 15b to 15e are inserted into the corresponding 4 th insertion holes 55b to 55e, whereby the 3 rd fastening bolts 15b to 15e are screwed into the corresponding 3 rd female screw holes 49b to 49e and fixed. Then, the 1 st peripheral wall 71b and the 2 nd peripheral wall 73b abut against each other, and the case member 71 and the cover member 73 are fastened to each other, thereby completing the inverter housing 7. As shown in fig. 5, the inverter case 7 defines a housing space 7a for housing the inverter 9 by a 1 st bottom wall 71a, a 2 nd bottom wall 73a, a 1 st peripheral wall 71b, and a 2 nd peripheral wall 73 b. The number of the 3 rd fastening bolts 15a to 15e can be appropriately designed according to the size of the inverter case 7.

As shown in fig. 1 and 2, the gasket 16 is disposed between the motor case 1 and the inverter case 7. The gasket 16 is formed in a substantially annular shape corresponding to the shape of the motor housing 1, and can surround the connection terminal 17 and the through hole 711. The washer 16 has a plurality of 5 th insertion holes 16a corresponding to the 1 st female screw holes 21a to 21d and the 1

st insertion holes

23a and 23b, respectively. The 5 th insertion hole 16a is arranged along the circumferential direction of the gasket 16. Further, a portion of the standing wall 110 of the housing main body 1a on the inner peripheral side of the gasket 16 is coated with a heat-conductive grease.

In the electric compressor, the inverter housing 7 is fastened and coupled to the motor housing 1 as follows. First, the gasket 16 is disposed between the motor case 1 and the inverter case 7. The 1 st female screw holes 21a to 21d of the 1 st mounting flange 1b, the corresponding 5 th insertion hole 16a disposed on the lower side of the washer 16, and the corresponding 2 nd insertion holes 47a to 47d of the case member 71 are aligned. Further, the respective 1

st insertion holes

23a, 23b of the 1 st mounting flange 1b, the corresponding 5 th insertion hole 16a disposed at the upper side of the washer 16, and the corresponding 2 nd

female screw holes

43a, 43b of the case member 71 are aligned.

In this state, as shown in fig. 2, the 1 st fastening bolt 11a is inserted through the 3 rd insertion hole 53a, the 2 nd insertion hole 47a, the 5 th insertion hole 16a, and the 1 st female screw hole 21a in this order in the direction from the 2 nd bottom wall 73a toward the motor housing 1. Similarly, the 1 st fastening bolt 11b is inserted through the 3 rd insertion hole 53b, the 2 nd insertion hole 47b, the 5 th insertion hole 16a, and the 1 st female screw hole 21b in this order. The 1 st fastening bolt 11c is inserted through the 3 rd insertion hole 53c, the 2 nd insertion hole 47c, the 5 th insertion hole 16a, and the 1 st female screw hole 21c in this order. Then, the 1 st fastening bolt 11d is inserted through the 3 rd insertion hole 53d, the 2 nd insertion hole 47d, the 5 th insertion hole 16a, and the 1 st female screw hole 21d in this order. As shown in fig. 4, the 1 st fastening bolts 11a to 11d are screwed and fixed to the corresponding 1 st female screw holes 21a to 21 d. That is, the 1 st fastening bolts 11a to 11d are inserted through the rear end of the motor housing 1 so as to pass through the cover member 73, the case member 71, and the washer 16 while avoiding the housing space 7a in the direction from the cover member 73 toward the motor housing 1.

As shown in fig. 1, the 2 nd fastening bolt 13a is inserted through the 1 st insertion hole 23a, the 5 th insertion hole 16a, and the 2 nd female screw hole 43a in this order in the direction from the motor housing 1 toward the cover member 73. Similarly, the 2 nd fastening bolt 13b is inserted through the 1 st insertion hole 23b, the 5 th insertion hole 16a, and the 2 nd female screw hole 43b in this order. Then, the 2

nd fastening bolts

13a and 13b are screwed and fixed to the corresponding 2 nd

female screw holes

43a and 43 b. That is, the 2

nd fastening bolts

13a and 13b are screwed into the 2 nd

female screw holes

43a and 43b through the protruding

portions

114 and 115 and the washer 16 in the direction from the motor housing 1 toward the cover member 73. Here, since the 2 nd

female screw holes

43a and 43b do not penetrate through the 1 st and 2

nd bosses

712 and 713, respectively, the 2

nd fastening bolts

13a and 13b screwed into the 2 nd

female screw holes

43a and 43b do not enter the housing space 7 a. Further, the 2

nd fastening bolts

13a and 13b may be fixed to the corresponding 2 nd

female screw holes

43a and 43b before the 1 st fastening bolts 11a to 11d are fixed to the corresponding 1 st female screw holes 21a to 21 d.

In this way, the inverter case 7 and the washer 16 are fastened and coupled in the axial direction of the motor case 1 by the 1 st fastening bolts 11a to 11d and the 2

nd fastening bolts

13a and 13b, and the washer 16 is sandwiched between the motor case 1 and the inverter case 7. In other words, the 1 st bottom wall 71a abuts the rear end of the motor housing 1 via the gasket 16. By fastening and coupling the motor housing 1, the gasket 16, and the inverter housing 7 in this manner, the connection terminal 17 enters the through hole 711 of the case member 71. In through hole 711, connecting terminal 17 is connected to connected terminal 99 via external terminal 17a, and motor mechanism 3 in case body 1a is electrically connected to inverter 9 in housing space 7a of inverter case 7. The gasket 16 prevents foreign matter such as water from flowing into the connection terminal 17 and the through hole 711, and also prevents the heat-conductive grease applied to the vertical wall 110 of the housing body 1a from overflowing to the outside of the gasket 16. The number of the 1 st fastening bolts 11a to 11d and the 2

nd fastening bolts

13a and 13b can be appropriately designed according to the size of the motor housing 1 and the inverter housing 7.

The 1 st female screw holes 21a to 21d and the 2 nd insertion holes 47a to 47d are arranged in a ring shape, and the 1

st insertion holes

23a and 23b are formed in the protruding

portions

114 and 115. The 5 th insertion hole 16a of the gasket 16 is arranged along the circumferential direction of the gasket 16. Therefore, in the electric compressor, in a state where the motor housing 1, the gasket 16, and the inverter housing 7 are fastened and coupled, the 1 st fastening bolts 11a to 11d and the 2

nd fastening bolts

13a and 13b penetrate the gasket 16 and are annularly arranged along the gasket 16 (see fig. 4).

Here, as described above, the converter circuit 93 is disposed below the filter circuit 95 on the circuit board 91. Therefore, by fastening and coupling the motor housing 1, the gasket 16, and the inverter housing 7, the inverter circuit 93 is disposed at a position facing the housing main body 1a through the 1 st bottom wall 71a as shown in fig. 5. In this electric compressor, the case member 71 and the cover member 73 are also fastened and coupled by the 1 st fastening bolts 11a to 11 d. Thus, the motor-driven compressor is completed.

In the electric compressor configured as described above, a dc current is supplied from battery 33 to inverter 9 through power supply connector 29. Further, a control signal is transmitted from the control device 41 to the inverter 9 through the communication connector 35. The converter circuit 93 converts the dc current into an ac current. The filter circuit 95 removes noise generated during operation of the electric compressor. In this way, the inverter 9 supplies ac power to the motor mechanism 3 and performs drive control of the motor mechanism 3 based on the control signal. Thereby, the motor mechanism 3 drives the compression mechanism 5 through the drive shaft 25. In this way, the compression mechanism 5 compresses the refrigerant sucked from the suction port 112, and discharges the compressed refrigerant from the discharge port.

In the electric compressor, the power connector 29 is provided on the 1 st bottom wall 71a of the case member 71. The power connector 29 is increased in size in response to the increase in voltage and the increase in current. In the electric compressor, the communication connector 35 is also provided on the 1 st bottom wall 71a, and the communication connector 35 is disposed adjacent to the power supply connector 29. In this case, in order to prevent short-circuiting between the power connector 29 and the communication connector 35, the power connector 29 and the communication connector 35 are disposed in the 1 st bottom wall 71a with a predetermined gap therebetween in the left-right direction of the 1 st bottom wall 71 a. This increases the area of the 1 st bottom wall 71a, and increases the size of the inverter case 7.

In this regard, in the electric compressor, the 1 st fastening bolts 11a to 11d are screwed into the 1 st female screw holes 21a to 21d so as to pass through the cover member 73, the shell member 71, and the washer 16 while avoiding the housing space 7a in the direction from the cover member 73 toward the motor housing 1, thereby fastening and fastening the motor housing 1, the washer 16, and the inverter housing 7. The 2

nd fastening bolts

13a and 13b are screwed into the 2 nd

female screw holes

43a and 43b so as to penetrate the

protrusions

114 and 115 and the washer 16 in the direction from the motor housing 1 toward the cover member 73, thereby fastening and fastening the motor housing 1, the washer 16, and the inverter housing 7. In this way, in the electric compressor, not only the 1 st fastening bolts 11a to 11d are inserted in the direction from the cover member 73 toward the motor housing 1 to fasten and connect the motor housing 1, the gasket 16, and the inverter housing 7, but also the 2

nd fastening bolts

13a and 13b are inserted in the direction from the motor housing 1 toward the cover member 73 to fasten and connect the motor housing 1, the gasket 16, and the inverter housing 7. At this time, the 1 st fastening bolts 11a to 11d and the 2

nd fastening bolts

13a and 13b fasten and connect the motor housing 1, the gasket 16, and the inverter housing 7 without penetrating the housing space 7a, and therefore, in the electric compressor, it is not necessary to divide the inverter 9 in order to avoid interference with the 1 st fastening bolts 11a to 11d and the 2

nd fastening bolts

13a and 13 b. The 1 st fastening bolts 11a to 11d also serve as fastening means for fastening the cover member 73 and the case member 71. Thus, in the electric compressor, even if the power supply connector 29 is increased in size, the motor housing 1 and the inverter housing 7 increased in size can be firmly fastened and coupled to each other.

In the electric compressor, the 1 st and 2 nd fastening bolts 11a to 11d and 13a and 13b are annularly arranged along the washer 16 while penetrating the washer 16. Therefore, by fastening and coupling the motor housing 1, the gasket 16, and the inverter housing 7, the surface pressure is easily and uniformly generated with respect to the gasket 16. Thus, the gasket 16 can appropriately prevent foreign matter such as water from flowing into the connection terminal 17 and the through hole 711, and can appropriately prevent the grease for heat conduction from overflowing to the outside of the gasket 16.

Therefore, the electric compressor of the present embodiment can satisfy the requirements for higher voltage and larger current, and can suppress the occurrence of the electrical failure between the motor mechanism 3 and the inverter 9 with high reliability.

In particular, in the electric compressor, the power connector 29 and the communication connector 35 are both provided on the 1 st bottom wall 71 a. Therefore, the increase in the axial length of the electric compressor can be suppressed as compared with the configuration in which the motor housing 1, the gasket 16, and the inverter housing 7 are tightly and fixedly coupled in the axial direction of the motor housing 1 and the power supply connector 29 and the communication connector 35 are provided on the 2 nd bottom wall 73 a. In addition, the power connector 29 protrudes from the 1 st bottom wall 71a toward the front, that is, toward the motor housing 1. In this regard, the electric compressor can also suppress an increase in the axial length.

In this electric compressor, since the compression mechanism 5 is also housed in the casing main body 1a, the motor mechanism 3 can be cooled by the refrigerant sucked into the casing main body 1a from the suction port 112, that is, the refrigerant before being compressed by the compression mechanism 5. The refrigerant also causes the casing body 1a to have a low temperature. In the inverter 9, the inverter circuit 93 is disposed at a position facing the case body 1a via the 1 st bottom wall 71 a. In the inverter 9, although the inverter circuit 93 is likely to generate heat during operation, in the electric compressor, the inverter circuit 93 can be cooled by the low-temperature casing main body 1a via the 1 st bottom wall 71 a.

In the inverter 9, the filter circuit 95 is disposed above the conversion circuit 93 on the circuit board 91 at a position avoiding the 1 st and 2

nd protrusions

712 and 713. Therefore, the positions of the 1 st and 2

nd bosses

712 and 713 and the 2 nd

female screw holes

43a and 43b formed in the 1 st bottom wall 71a are not limited by the position of the filter circuit 95 of the circuit board 91. Therefore, the 2 nd

female screw holes

43a and 43b can be formed at appropriate positions on the 1 st bottom wall 71a, and the 2

nd fastening bolts

13a and 13b can fasten and fasten the motor housing 1, the washer 16, and the inverter housing 7 at appropriate positions. In this regard, in the electric compressor, the motor housing 1, the gasket 16, and the inverter housing 7 can be firmly fastened and coupled. In addition, the surface pressure is easily generated uniformly with respect to the gasket 16.

In the electric compressor, the motor housing 1 and the inverter housing 7 are separate bodies from each other before being fastened and coupled by the 1 st fastening bolts 11a to 11d and the 2

nd fastening bolts

13a and 13 b. Further, it is not necessary to provide a space for installing the inverter 9 in the motor case 1. Therefore, in the electric compressor, the degree of freedom in designing the motor housing 1 and the inverter housing 7 can be increased.

The present invention has been described above with reference to the embodiments, but the present invention is not limited to the above embodiments, and can be applied by appropriately changing the embodiments without departing from the scope of the present invention.

For example, in the electric compressor according to the above embodiment, the motor housing 1, the gasket 16, and the inverter housing 7 are fastened and coupled in the axial direction of the motor housing 1. However, the present invention is not limited to this, and the motor housing 1, the gasket 16, and the inverter housing 7 may be fastened and coupled in the radial direction of the motor housing 1, that is, the gasket 16 and the inverter housing 7 may be fastened and coupled above or below the motor housing 1.

In the electric compressor according to the above embodiment, the motor mechanism 3 and the compression mechanism 5 are housed in the casing main body 1 a. Not limited to this, the compression mechanism 5 may be housed in a cover, or a dedicated housing for housing the compression mechanism 5 may be provided.

In the electric compressor according to the above embodiment, the gasket 16 is used as the sealing member, but the present invention is not limited thereto, and any sealing means such as an O-ring may be used as the sealing member.

Further, the following may be configured: the power connector 29 is provided on the 2 nd bottom wall 73a, or the power connector 29 is provided on the 1 st bottom wall 71a and the communication connector 35 is provided on the 2 nd bottom wall 73a or the 1 st and 2 nd

peripheral walls

71b, 73 b. Further, the following may be configured: the power connector 29 and the communication connector 35 are both provided on the No. 2 bottom wall 73 a.

In the electric compressor according to the above embodiment, the electric compressor may be configured such that: the compression mechanism 5 compresses a fluid other than the refrigerant.

In the electric compressor according to the above embodiment, the 1 st fastening bolts 11a to 11d are fixed to the corresponding 1 st female screw holes 21a to 21 d. However, the present invention is not limited to this, and the following configuration may be adopted: the 1 st fastening bolts 11a to 11d are passed through from the 2 nd bottom wall 73a to the 1 st mounting flange 1b, and the 1 st fastening bolts 11a to 11d are fixed by nuts outside the 1 st mounting flange 1 b.

Claims

1. An electric compressor is characterized by comprising:

a compression mechanism configured to compress a fluid;

a motor mechanism configured to drive the compression mechanism;

an inverter configured to control driving of the motor mechanism;

a motor housing having a cylindrical shape and accommodating at least the motor mechanism therein;

an inverter case that accommodates the inverter therein;

a sealing member having an annular shape and sandwiched between the motor housing and the inverter housing; and

a fastening coupling member that fastens and couples the motor case and the inverter case,

a connection terminal electrically connected to the motor mechanism and a projection projecting in a radial direction of the motor housing are provided at a 1 st end of the motor housing,

the inverter case includes a case member having a bottom wall facing the 1 st end of the motor case and a peripheral wall rising from a peripheral edge of the bottom wall, and a cover member abutting against the peripheral wall and defining a housing space for housing the inverter together with the case member,

the bottom wall has an internal thread hole and a through hole for the connection terminal to be inserted through,

the sealing member surrounds the through-hole and the connection terminal,

a power supply connector for electrically connecting an external power supply to the inverter is provided on the bottom wall or the cover member,

the fastener link has:

a 1 st fastening link that penetrates the cover member and the case member in a direction from the cover member toward the motor housing and is inserted through the 1 st end of the motor housing; and

a 2 nd fastening link penetrating the protrusion in a direction from the motor housing toward the cover member and threadedly engaged with the internal threaded hole,

the 1 st and 2 nd fastening members are annularly arranged along the sealing member.

2. The motor-driven compressor according to claim 1,

the motor shell and the converter shell are tightly and fixedly connected in the axial direction of the motor shell,

the power connector is arranged on the bottom wall.

3. The motor-driven compressor according to claim 2,

at the bottom wall, a communication connector that electrically connects an external control device with the inverter is provided.

4. The motor-driven compressor according to any one of claims 1 to 3,

a suction port for sucking fluid into the interior is provided in the motor housing,

the converter includes a circuit board and a conversion circuit connected to the circuit board and converting an alternating current into a direct current,

the switching circuit is disposed on the circuit board at a position facing the motor case with the bottom wall interposed therebetween.

5. The motor-driven compressor according to any one of claims 1 to 4,

the 2 nd fastening link is 1 of a plurality of 2 nd fastening links,

the bottom wall is provided with a plurality of bosses protruding toward the cover member and having the female screw holes therein,

the converter has a circuit board and a filter circuit connected to the circuit board and removing noise generated during operation,

the filter circuit is disposed at a position on the circuit board that avoids the plurality of projections.