JP2012047139A - Inverter-integrated electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverter-integrated electric compressor that eliminates restriction on the arrangement of a connector box without increasing the size of a machine container while having an inverter arranged on an axial end face.SOLUTION: The inverter-integrated electric compressor includes a body casing 1, and an inverter casing 4 attached to an opening of a main casing and incorporating the inverter. A connecter installation part 14 is integrally formed on the outer peripheral part of the body casing so that an end face of an opened part becomes the same flat surface as the opening end face of the body casing, and a portion of the connector installation part is also used as a mounting leg. A cover 4a extended from the inverter case blocks the opened part of the connector installation part 14. An increase in size seen in a type in which the connector box is positioned above the mounting leg can be avoided, and as conventionally, the connector box and the mounting leg are provided near the inverter case, thus obtaining the inverter-integrated electric compressor having high mounting capability on a vehicle and high wiring connection work efficiency.

Description

  The present invention incorporates a compression mechanism portion that sucks, compresses and discharges fluid, and an electric motor that drives the compression mechanism portion in an airframe container, and an inverter integrated type that drives the electric motor by an inverter integrated with the airframe. The present invention relates to an electric compressor.

  This type of electric compressor has a configuration in which an inverter, a compression mechanism, and an electric motor are partitioned from each other. (For example, refer to Patent Document 1). As shown in FIG. 4, the device described in Patent Document 1 is provided with a partition wall that partitions the fuselage container into a compression chamber and an inverter chamber in the axial direction, and the compression mechanism portion 105 and the electric motor 106 are accommodated in the compression chamber. The inverter 107 is accommodated in the inverter chamber. Here, the inverter 107 faces the suction side of the electric motor 106 through the partition wall, and cools the inverter 107 and the electric motor 106 with the sucked refrigerant and then flows into the compression mechanism 105 ( A typical structure of a so-called low-pressure inverter-integrated electric compressor).

  Further, as shown in FIG. 5, the device described in Patent Document 2 includes an airframe container 202 containing a motor 201, a compression mechanism unit 203, and an inverter 204 on the opposite side of the motor 201 across the compression mechanism unit 203. The accommodated inverter case 205 is fastened with bolts or the like in the axial direction. In this compressor, the refrigerant drawn in from the suction hole provided in the compression mechanism section 203 is once guided to a passage provided in the inverter case 205 to exchange heat with the inverter 204 and then again in the compression mechanism. Returned to the unit 203. Further, the refrigerant gas compressed by the compression mechanism unit 203 is cooled through the discharge hole provided in the fuselage container 202 after the electric motor 201 is cooled (typical in a so-called high-pressure inverter-integrated electric compressor). Structure).

Japanese Patent Laid-Open No. 2003-129983 JP 2007-224809 A JP 2004-162618 A

  In the structure described in Patent Document 1, since the suction refrigerant is sucked into the compression mechanism 105 after the heat exchange with the high heat-generating parts of the inverter 107 and the electric motor 106 by the suction refrigerant, the volume efficiency is increased by the rise in the temperature of the suction refrigerant. This will greatly affect the performance of the compressor. Further, since the refrigerant discharged from the compression mechanism 105 is directly discharged to the outside without reaching the electric motor 106 side, the lubricating oil accompanying the refrigerant discharged from the compression mechanism 105 is separated to improve the performance of the refrigeration cycle. If it is going to do, it will only have to perform in the discharge process to the said outside, and it will be difficult to isolate | separate. For this reason, a full-scale and large-sized separator is required, which causes an increase in the size and weight of the fuselage container.

  On the other hand, the structure described in Patent Document 2 is different from the structure described in Patent Document 1 in that the suction refrigerant is used only for inverter cooling, and the lubricating oil separator is a machine body container 202 in which an electric motor 201 is accommodated. Since it can be provided by using the empty space, there are advantages in terms of performance and the size of the aircraft container.

  However, the structures described in Patent Documents 1 and 2 have the following problems. That is, with reference to FIG. 7, this type of inverter-integrated electric compressor is first installed and used in a vehicle. At that time, the inverter-integrated electric compressor is attached as a mounting portion to the vehicle. The leg 405 is often provided in the vicinity of the mounting portion of the inverter case 401 on the upper part of the fuselage container 202 from the viewpoint of workability. On the other hand, the connector box 404 for installing the power supply connector 402 and the communication connector 403 for receiving power and signals from the vehicle is also an inverter near the mounting leg 405 above the fuselage container 202 from the viewpoint of connection workability. It is often required to be provided on the top of the case 401. Therefore, in such a case, it is necessary to avoid the mounting legs 405 so that the connectors 402 and 403 can be connected. For this purpose, the connector box 404 is disposed above the mounting legs 405 of the fuselage container 202. It is necessary to install the connector box 404 so that the height of the connector box 404 is increased and the whole size is increased.

  As a measure for solving such a problem, it is conceivable to provide the connectors 402 and 403 on the side opposite to the fuselage container 202 as shown in FIG. The direction became larger, and an increase in size was inevitable.

  The present invention provides an inverter-integrated electric compressor that solves the above-mentioned conventional problems and solves the restrictions on the arrangement of the connector box without increasing the size of the fuselage container while the inverter is arranged on the end surface in the axial direction. is there.

  In order to solve the above-described conventional problems, an inverter-integrated electric compressor according to the present invention includes a compression mechanism portion that sucks, compresses, and discharges fluid, and an electric motor that drives the compression mechanism portion. A main body casing having a suction passage formed at an end of the main body casing, and an inverter case that is attached to the opening of the main body casing and incorporates an inverter that drives the electric motor. The connector installation part is integrally formed so that is in the same plane as the opening end surface of the main body casing, and a part of the connector installation part is also used as a mounting leg, and the connector is installed by a cover part that extends the inverter case. In this configuration, a connector box having a form in which the open part of the part is closed is formed.

  As a result, the connector box can include a mounting leg to secure a connection space for the power line connector, etc., and can avoid an increase in size as in the conventional case where the connector box is positioned above the mounting leg. As in the prior art, a connector box and mounting legs are provided in the vicinity of the inverter case, so that the inverter-integrated electric compressor can be mounted on a vehicle or the like and has high wiring mounting workability.

  Since the inverter-integrated electric compressor of the present invention can be provided with a connector box and mounting legs in the vicinity of the inverter case without increasing the size of the entire compressor, it can of course be installed in a vehicle having a limited installation space. In addition, fixing of the fuselage container at the time of installation and wiring connection work such as a power line connector become easy.

Partial sectional view of the inverter-integrated electric compressor according to Embodiment 1 of the present invention. Cross-sectional view of the inverter-integrated electric compressor in the first embodiment Partial sectional view of the inverter-integrated electric compressor according to the second embodiment of the present invention. Sectional drawing of the inverter-integrated electric compressor of Conventional Example 1 Sectional view of the inverter-integrated electric compressor of Conventional Example 2 Sectional drawing of the inverter-integrated electric compressor for explaining the problems of the conventional example Sectional drawing of the inverter-integrated electric compressor for explaining the problems of the conventional example

  A first invention includes a compression mechanism portion that performs suction, compression, and discharge of fluid, a motor casing that drives the compression mechanism portion, and a main body casing in which a suction passage is formed at one end, An inverter case having an inverter built in an inverter that drives the electric motor, and is attached to an outer peripheral portion of the main body casing so that an end surface of the open portion is flush with an open end surface of the main body casing. A configuration in which a connector box is formed in which the installation portion is integrally formed, a part of the connector installation portion is also used as a mounting leg, and the open portion of the connector installation portion is closed by a cover portion extending the inverter case It is as.

  As a result, the connector box can include a mounting leg to secure a connection space for the power line connector, etc., and can avoid an increase in size as in the conventional case where the connector box is positioned above the mounting leg. As in the prior art, a connector box and mounting legs are provided in the vicinity of the inverter case to provide an inverter-integrated electric compressor with high workability for wiring and wiring connection.

  According to a second aspect of the present invention, there is provided a compression mechanism portion that sucks, compresses and discharges a fluid, a motor casing that drives the compression mechanism portion, and a main body casing in which a suction passage is formed at one end, An inverter case having an inverter built in an inverter that drives the electric motor, and is attached to an outer peripheral portion of the main body casing so that an end surface of the open portion is flush with an open end surface of the main body casing. The installation part is integrally formed, and the connector box is formed by closing the open part with a cover part that extends the inverter case, and it is attached to the vehicle and wiring connection work while avoiding the enlargement of the body container A highly integrated inverter-integrated electric compressor.

  According to a third aspect of the present invention, the inverter case has a structure in which a wiring passage connecting the space for installing the inverter board and the space of the connector box is formed, and wiring from the connector box can be completed in the inverter case. It can be reliably protected from dust and water.

  According to a fourth aspect of the present invention, there is a structure in which a connector for supplying power to the inverter and a connection line for connecting the communication connector and the inverter substrate are provided with a connector for connection on at least one side, and the connection work can be easily performed.

  According to a fifth aspect of the present invention, the seal member disposed between the connector box integrally formed in the main body casing and the cover portion closing the opening of the connector box of the inverter case is installed between the comp case and the inverter case. In addition, the structure is integrally formed with the pressure vessel sealing material, so that the work of attaching the sealing material is improved and the number of parts can be reduced.

  The sixth invention has a structure in which a coil for preventing electromagnetic noise generation and a ferrite magnet are installed in the connection line in the space in the connector box, and the reliability is high.

  According to a seventh aspect of the present invention, a connector box is installed on the end surface opposite to the inverter case side of the connector installation portion, and a suction pipe mounting portion communicating with the suction passage in the inverter case is provided in the vicinity of the connector box. Yes, the connector box can be cooled by the refrigerant flowing from the suction pipe mounting portion.

According to an eighth aspect of the present invention, the high voltage connector or the communication connector is installed on the cover portion of the inverter case, and the connection line connecting the inverter circuit board and the high voltage connector or the communication connector has a U-shape. The projecting portion is formed and arranged in the installation portion, and the same effect as the first invention is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a partial cross-sectional view showing a configuration of an inverter-integrated electric compressor according to Embodiment 1 of the present invention.

  In FIG. 1, an electric motor 2 is built in a main body casing 1, and a compression mechanism unit 3 that is fitted or press-fitted into the main body casing 1 is driven. The main body casing 1 has an inverter case 4 fixed to an opening on the compression mechanism section 3 side with a bolt or the like (not shown). In this inverter case 4, a refrigerant suction passage 6 is formed on the partition wall 4a on the compression mechanism section 3 side, and an inverter circuit board 5 for driving the motor 2 is attached to the opposite side surface via a column 4b. Reference numeral 5a denotes an IPM (intelligent power module) provided on the inverter circuit board 5, which generates high heat and is in close contact with the partition wall 4a in order to obtain a cooling effect.

  The present invention basically includes a compression mechanism portion 3 that sucks, compresses, and discharges liquid, a main body casing 1 that includes an electric motor 2 that drives the compression mechanism portion 3, and a motor that drives the electric motor 2. An electric compressor having an inverter case 4 containing an inverter circuit board 5 having a drive circuit section may be used, and the following description does not limit the description of the scope of claims.

  The compression mechanism 3 of the electric compressor according to the present embodiment is of a scroll type as one example. The compression mechanism portion 3 is accommodated in the main body casing 1 and is sandwiched and fixed by an inner peripheral end surface of the inverter case 4 and an inner surface stepped portion of the main body casing 1, and the end surface of the main body casing 1 and the inverter case 4 is a structure that is hermetically sealed using an external sealing material 1 a between the outer peripheral end surfaces of 4. The refrigerant suction passage is provided in an internal sealed space formed by installing an internal sealant between an inner peripheral end surface which is the same surface of the inverter case 4 and a stepped portion provided on the outer periphery of the compression mechanism portion 3. 6 and has a structure for cooling inverter components such as the IPM 5a built in the inverter case 4. The compression mechanism 3 is formed with a discharge chamber 9 composed of a fixed honey 7 and a lid 8.

  The inverter case 4 is provided with a suction pipe mounting portion 10a. The refrigerant sucked from the suction pipe mounting portion 10a is diffused into the suction passage 6 and cools the partition wall 4a, whereby the inverter circuit board 5 and the IPM 5a. After exchanging heat with a heating element such as the like, it flows into the compression space through the suction port of the fixed honey 7. The suction pipe mounting portion 10a is installed adjacent to a cover portion 4a of the inverter case 4 described later, and a suction hole 10 communicating therewith is connected to the suction passage 6.

  A terminal 11 in which three terminals are arranged in a straight line is installed on the inverter circuit board 5 in the inverter case 4 and is connected to the electric motor 2. That is, the lead wire 2 a from the electric motor 2 is connected to the cluster 11 a through a communication passage provided in the vicinity of the outer periphery of the fixed heater 7, and is inserted and fixed to the compressor terminal 11 from the inside. Further, the inverter circuit board 5 is connected to a high voltage connector 12 for introducing electric power from the outside by a connection line 13.

Next, the structure of the connector box 15 for connecting the high voltage connector 12 will be described. First, a connector installation portion 14 is formed on the outer periphery of the opening on the inverter case 4 side of the main casing 1. This connector installation part is a bottomless box shape, and is integrally formed with the main body casing so that the open end surface 14 a on the inverter case 4 side is flush with the end surface of the main body casing 1. Further, the connector installation portion 14 is integrally formed with an attachment leg 22 that is an attachment portion to a vehicle or the like in the lower part of the drawing. On the other hand, a cover portion 4a is integrally formed at a portion corresponding to the connector installation portion 14 of the inverter case 4 attached to the opening of the main body casing 1, and the cover portion 4a is attached by attaching the inverter case 4 to the main body casing 1. Closes the open end surface 14 a of the connector installation portion 14 to form a connector box 15. At this time, a seal member that seals the joint portion between the connector installation portion 14 and the cover portion 4a is integrally formed with the seal material 1a that seals between the main body casing 1 and the inverter case 4. That is, the seal member 19 disposed between the connector installation portion 14 integrally formed in the main body casing 1 and the cover portion 4 a of the inverter case 4 is a pressure vessel installed between the main body casing 1 and the inverter case 4. It is integrally formed with the sealing material 1a.

  Further, the inverter case 4 is formed with a wiring passage 16 for connecting the space for installing the inverter circuit board 5 and the space for the connector box 15, and the high voltage connector 12 and the communication connector 17 for supplying power to the inverter. The connection line 13 connecting the inverter circuit board 5 and the inverter circuit board 5 can be completely connected in the inverter case 4 and can be reliably protected from dust and water. In addition, a connection connector 18 is provided on one of the connection line 13 and the inverter circuit board 5 so that the connection can be easily performed. In addition, at least one connecting wire 13 is sandwiched and fixed between the connector installation portion 14 and the inner wall surface of the inverter case 4.

  Furthermore, the connection wire 13 in the space in the connector box 15 is provided with a coil 20 and a ferrite magnet 21 for preventing the generation of electromagnetic noise, thereby improving the safety against noise.

  Therefore, in this electric compressor, the mounting legs 22 are integrally formed at the lower part of the connector box 15 and both of them are overlapped in the vertical direction on the drawing, and the upper surface of the mounting legs 22 and the connector are connected. Since the space between the installation portion 14 and the ceiling wall only needs to pass through the connection line 13 as shown in FIG. 3, the upward projecting dimension of the connector box 15 can be kept small. Further, even if the connector flange 12a of the high voltage connector 12 attached to the connector box 15 protrudes from the main body portion of the high voltage connector 12 to the outer periphery, the lower portion of the protruding portion is the height of the mounting leg 22. Since the thickness can be offset by the direction thickness portion, the upward projecting dimension of the connector box 15 can be further suppressed.

  The inverter case side opening portion of the connector installation portion 14 is closed by a cover portion 4a formed integrally with the inverter case 4, so that it is not necessary to prepare a separate dedicated component, and the cover portion 4a and the connector installation portion 14 are not provided. Since sealing is performed with a sealing member that seals between the main casing 1 and the inverter case 4, a dedicated sealing member is not required as described above, and the connector box 15 can be formed with simple and few parts.

(Embodiment 2)
FIG. 3 is a partial cross-sectional view showing the configuration of the inverter-integrated electric compressor according to Embodiment 2 of the present invention.

In this embodiment, the high voltage connector 12 is attached to the cover portion 4a side. In this structure, the connecting line 1 connecting the inverter circuit board 5 and the high-voltage connector 12.
3 has a substantially U-shape, the bent portion forms a protruding portion 23 in the connector box 15, and the connecting wire 13 uses a fixing member 24 on the inner wall of the connector box 15 or the inverter case 4 as a vibration proof measure. It is designed to be pinched and fixed. Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

  This embodiment also has the same effect as the first embodiment.

(Embodiment 3)
In each of the above-described embodiments, the connector box 15 is integrally formed with the mounting leg 22 from the viewpoint of downsizing, mounting, and wiring workability. However, the mounting leg 22 is provided at a location different from the connector box 15. In such a case, it is not necessary to integrally form the mounting legs 22 in the connector box 15. The connector installation portion 14 is integrally formed in the main body casing 1 and the open portion of the connector installation portion 14 is closed in the inverter case 4. In this case, it is possible to make the wiring work easier and to reduce the size by preventing the connector box 15 and the separate mounting leg from overlapping in the vertical direction. Become.

  In each of the above embodiments, the high-voltage connector 12 for introducing a high voltage has been described. However, the configuration is the same even if at least one of a communication connector for communication and a low-voltage connector for 12V is disposed at the same time. Needless to say, you can.

  In addition, although all of the above-described embodiments have shown the case of a so-called high-pressure electric compressor, it goes without saying that a similar structure can be formed even with a so-called low-pressure electric compressor. In addition, although the example of the scroll system was shown as a compressor, the same structure is possible also by another compression system.

  As described above, the inverter-integrated electric compressor according to the present invention has an inverter disposed on the end face of the compressor on the axis that is less susceptible to radiant heat from an engine or the like than a conventional electric compressor with a built-in inverter. The mounting and wiring workability can be improved without increasing the size of the fuselage container, and it is suitable as an electric compressor for a vehicle.

DESCRIPTION OF SYMBOLS 1 Main body casing 1a Pressure vessel sealing material 2 Electric motor 2a Lead wire 3 Compression mechanism part 4 Inverter case 4a Cover part 5 Inverter circuit board 6 Suction passage 7 Fixed splash 10a Suction piping attachment part 11 Compressor terminal 12 High voltage connector 13 Connection Wire 14 Connector installation portion 15 Connector box 16 Wiring passage 18 Connector for connection 19 Seal material 20 Coil 21 Ferrite magnet 22 Compressor mounting leg 23 Projection portion 24 Fixing member

Claims (8)

A main body casing that incorporates a compression mechanism portion that sucks, compresses and discharges fluid, and an electric motor that drives the compression mechanism portion, and has a suction passage formed at one end thereof; and an opening portion of the main body casing. And an inverter case containing an inverter for driving the electric motor, and the connector installation portion is integrally formed on the outer periphery of the main body casing so that the end surface of the open portion is flush with the open end surface of the main body casing. An inverter-integrated electric compressor in which a connector box is formed in which a part of the connector installation portion is also used as a mounting leg and an open portion of the connector installation portion is closed by a cover portion extending the inverter case. A main body casing that incorporates a compression mechanism portion that sucks, compresses and discharges fluid, and an electric motor that drives the compression mechanism portion, and has a suction passage formed at one end thereof; and an opening portion of the main body casing. And an inverter case containing an inverter for driving the electric motor, and the connector installation portion is integrally formed on the outer periphery of the main body casing so that the end surface of the open portion is flush with the open end surface of the main body casing. An inverter-integrated electric compressor in which a connector box having a form in which the open part is closed by a cover part obtained by extending an inverter case is formed. 3. The inverter-integrated electric compressor according to claim 1, wherein a wiring passage that connects a space in which an inverter circuit board is installed and a space in the connector box is formed in the inverter case. At least one of the connection lines connecting the circuit board of the inverter, the high-voltage connector, and the communication connector is provided with a connection connector, and the connection line has at least one place, the connector installation portion and the inverter case. The inverter-integrated electric compressor according to any one of claims 1 to 3, wherein the inverter-integrated electric compressor has a structure in which the inner wall is sandwiched and fixed via a fixing member. A seal member disposed between the connector installation portion integrally formed in the main body casing and a cover portion that closes the opening of the connector installation portion of the inverter case is installed between the main body casing and the inverter case. The inverter-integrated electric compressor according to any one of claims 1 to 4, wherein the inverter-integrated electric compressor is integrally formed with the pressure vessel sealing material. The inverter-integrated electric compressor according to any one of claims 1 to 5, wherein a coil for preventing generation of electromagnetic noise and a ferrite magnet are installed on a connection line arranged in the space of the connector box. A connector box is installed on an end surface of the connector installation portion opposite to the inverter case side, and a suction pipe mounting portion communicating with a suction passage in the inverter case is provided in the vicinity of the connector box. The inverter-integrated electric compressor according to any one of the above. The high voltage connector or the communication connector is installed on the cover part of the inverter case, and the connection line connecting the inverter circuit board and the high voltage connector or the communication connector is a U-shaped form protruding into the connector installation part. The inverter-integrated electric compressor according to any one of claims 1 to 6, wherein the inverter-integrated electric compressor is disposed.