JP2012136998A - Integrated inverter electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an integrated inverter electric compressor which is easy to attach to and detach from a compressor body by reducing the number of components required therefor, and which includes an inverter unit capable of effectively radiating generated heat of an electric element.SOLUTION: There are provided the inverter unit 20 that includes the constituent members of an inverter device accommodated within a housing 21 independent of the compressor body 10, and the compressor body 10 having an installation surface 13 on which the inverter unit 20 is detachably installed. The inverter unit 20 is provided with a convexed guide 24 while a concaved guide 14 to be engaged with the convexed guide 24 placed on the installation surface 13 of the compressor body 10. The inverter unit 20 includes a heat sink 23 with the housing 21 on its surface opposed to the installation surface 13 of the compressor body 10, while having an electric element to serve as a heating element so disposed as to be kept in contact with the heat sink 23.

Description

  The present invention relates to an electric compressor in which an inverter unit including an inverter circuit that converts DC power into three-phase AC power is integrated.

In recent years, in the automobile industry, in order to respond to the energy environment, development and introduction of vehicles that use electric power, such as hybrid cars, electric cars, and fuel cell cars, have progressed at a rapid pace. It has been.
Unlike conventional air conditioners, these vehicles are equipped with air conditioners that include an electric compressor driven by an electric motor powered by electricity. In addition, this electric compressor is a hermetic type electric compressor in which a compression mechanism and an electric motor are built in a housing, and converts DC power from a power source into three-phase AC power via an inverter device, and is electrically operated. An electric compressor that feeds power to the motor and can variably control the rotation speed of the compressor according to the air conditioning load is employed. The inverter device and the electric motor are connected by a three-phase AC wiring, but contain large switching noise. Therefore, it is preferable to make the length of the wiring as short as possible. For this purpose, an inverter-integrated electric compressor in which the inverter device is integrated with the electric compressor has been proposed.

JP 2008-128142 A JP 2007-309125 A

For example, in Patent Document 1, a plurality of power semiconductor switching elements (typically IGBTs), a control board, a power board, a bus bar assembly, and the like constituting an inverter device are assembled on a metal plate that also serves as a heat sink, An inverter-integrated electric compressor in which this metal plate is fixedly installed in an inverter accommodating portion of a housing is disclosed. In Patent Document 1, a metal plate is provided with a protruding portion extending in the width direction in a direction orthogonal to the motor axial direction of the electric motor. By doing so, Patent Document 1 can improve the vibration resistance by increasing the rigidity of the metal plate against vibration around the motor axis.
However, the inverter-integrated electric compressor disclosed in Patent Document 1 has a large number of parts including screws as a result of screwing installation of the control board, power board, bus bar assembly, and the like to the metal plate. The structure is complicated. For this reason, it is pointed out that it is not easy to replace these boards when the control board and the power board break down.

Patent Document 2 includes an inverter circuit board, an electric element such as a coil, a capacitor, or a switching element, an upper case and a lower case, and a housing in which the inverter circuit board and the electric element are housed. An inverter unit is disclosed in which at least a part of the upper case is formed of metal and the electric element is fixed in a state of being in contact with a part of the upper case formed of metal.
In Patent Document 2, the electric element is fixed to the upper case, so that the electric element is prevented from vibrating, the vibration resistance is improved, and the electric element is fixed to the metal portion of the upper case. It is stated that even if the electric element generates heat, the heat is transmitted to the metal portion and dissipated.
At first glance, it is likely that the heat generated in the electric element can be radiated to the outside by providing a metal portion in the upper case as in the inverter unit of Patent Document 2. However, when an engine as an internal combustion engine is provided like a hybrid vehicle, it is difficult to dissipate the heat generated in the electric element to the outside by transferring the heat from the engine to the metal part of the upper case. It is.

  The present invention has been made on the basis of the problems as described above, and can be easily attached to and detached from the compressor main body by reducing the number of parts and can effectively dissipate heat generated by the electric element. It aims at providing an inverter integrated electric compressor provided with.

In order to facilitate attachment and detachment to the compressor body while reducing the number of parts, in the present invention, the members constituting the inverter device are unitized by housing them in a housing independent of the compressor body, and this unitization is achieved. The arranged inverter device (inverter unit) is arranged in contact with the installation surface of the compressor body.
The inverter unit is arranged such that the housing includes a heat radiating portion on a surface that contacts the installation surface of the compressor body, and an electric element serving as a heat generating element contacts the heat radiating portion.
Further, a convex guide is provided on one of the installation surface of the compressor main body and the heat radiating portion of the inverter unit, and a concave guide that is prevented from coming off from the convex guide is provided on the other.
The concave guide can have a trapezoidal shape in which the opening cross section is longer in the lower base than in the upper base, or the surface side can be a rectangle and the subsequent part can be a circle having a larger diameter than the rectangle.

In the inverter-integrated electric compressor of the present invention, it is preferable that the housing of the inverter unit is made of a material having a lower thermal conductivity than the heat radiating portion except for the heat radiating portion. This is to prevent the heat generated in the engine from being transmitted to the inside of the inverter unit, thereby preventing the temperature of the electric element from rising.
In the inverter-integrated electric compressor of the present invention, the position where the inverter unit is installed is arbitrary, but it can be arranged on the upper surface of the compressor main body or on the side surface of the compressor main body.

According to the present invention, the configuration related to the inverter device is integrated into the inverter unit, and the concave guide and the convex guide that are prevented from coming off are used to assemble the compressor body, so that it is not necessary to use almost any fastener such as a bolt. Therefore, the number of parts can be suppressed. In addition, since it is easy to attach and detach the inverter unit as a unit, it is possible to reduce the burden of replacing the substrate constituting the inverter unit due to failure.
Further, according to the present invention, the inverter unit is arranged such that the electric element that generates heat contacts the heat radiating plate, and the heat radiating plate contacts the installation surface of the compressor body. For this reason, the heat sink is cooled through the installation surface of the housing body by the low-temperature and low-pressure refrigerant gas sucked into the housing body from a suction port (not shown). As a result, the heat radiating plate becomes a heat sink, and heat generated in the electric element is radiated. Therefore, the heat generating system components that require cooling that constitute the inverter unit can be reliably forcibly cooled by the low-temperature refrigerant gas, and the cooling function of the inverter unit can be ensured.

It is a perspective view which shows the compressor main body of the inverter-integrated electric compressor in 1st Embodiment. The inverter unit of the inverter integrated electric compressor in 1st Embodiment is shown, (a) is a perspective view of an upright state, (b) is a perspective view of an inverted state, and (c) is a figure which shows an internal structure. . In 1st Embodiment, it is a side view which shows the procedure outline | summary which assembles | assembles an inverter unit to a compressor main body, (a) shows before assembling an inverter unit to a compressor main body, (b) shows an inverter unit in a compressor main body. Shown after assembly. The modification of 1st Embodiment is shown, (a) is a top view, (b) is a front view. The inverter integrated electric compressor in 2nd Embodiment is shown, (a) is a top view, (b) is a front view. The modification of 2nd Embodiment is shown, (a) is a top view, (b) is a front view. It is a figure which shows the example of the slippage prevention of the inverter unit with respect to a compressor main body, (a) is a top view, (b) is a side view.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
The inverter-integrated electric compressor 1 according to the first embodiment includes a compressor body 10 and an inverter unit 20.
The compressor body 10 includes a housing 11. The housing 11 includes a housing body 12 that houses an electric motor (not shown) and a compression mechanism driven by the electric motor. The rotation axis C of the electric motor and the compression mechanism is disposed inside the housing body 12 as shown in FIG. The housing body 12 is provided with a suction port (not shown), and the low-pressure refrigerant gas sucked from the suction port to the side where the electric motor of the housing body 12 is disposed flows around the electric motor. It is sucked into the compression mechanism and compressed. The high-temperature and high-pressure refrigerant gas compressed by the compression mechanism is discharged into the housing body 12 and then discharged to the outside from a discharge port (not shown) provided in the housing body 12. Since the electric motor and the compression mechanism can widely apply known configurations, a specific description thereof is omitted here. In the following description, in the compressor main body 10, the direction along the rotation axis C of the electric motor and the compression mechanism is defined as the front-rear direction, the front side of the sheet of FIG. The vertical direction of the paper surface is the vertical direction of the compressor main body 10, and the horizontal direction of the paper surface is the width direction of the compressor main body 10.

<Installation surface 13, concave guide 14>
The housing main body 12 made of an aluminum alloy has an arc surface on the lower side and a flat surface on the upper surface, and the installation surface 13 on which the inverter unit 20 is disposed is formed on the flat surface. A plurality of concave guides 14 are provided on the installation surface 13. The concave guide 14 has a trapezoidal shape in which the opening cross section is longer in the lower base than the upper base. As described later, when the convex guide 24 of the inverter unit 20 is inserted, the concave guide 14 exhibits a wedge effect. This prevents the inverter unit 20 from moving upward. The concave guide 14 is formed parallel to the rotation axis C from the front end to the rear end of the installation surface 13. When the concave guide 14 is assembled to the installation surface 13 in cooperation with the convex guide 24 of the inverter unit 20. The inverter unit 20 is guided to.

<Connector holder 15>
The housing 11 includes a connector holder 15. The connector holding body 15 provided on the rear end side of the housing main body 12 has a box-like outer shape, and a part of the connector holding body 15 projects upward from the installation surface 13. The surface on the front side of the portion protruding upward from the installation surface 13 forms an abutting surface 16 on which the inverter unit 20 abuts and performs positioning in the front-rear direction.
A connector 17 is provided on the contact surface 16. This connector 17 has a female structure connected to the connector 28 on the inverter unit 20 side. The inverter unit 20 supplies three-phase AC power to the electric motor 20 accommodated in the housing 11 via the connector 28 and the connector 17. Therefore, although not shown, the connector 17 is connected to the electric motor and the electric wire.

<Inverter unit 20>
The inverter-integrated electric compressor 1 includes an inverter unit 20 detachably attached to the compressor body 10.
As shown in FIG. 2, the inverter unit 20 includes a power system unit 25 including an IGBT (Insulated Gate Bipolar Transistor), a control board 26, and the like. The housing 21 includes a housing body 22 and a heat radiating plate 23. A heat sink 23 is installed so as to close the opening of the box-shaped housing body 22, and the inside of the housing 21 is sealed.
The housing body 22 can be made of a metal material such as an aluminum alloy or stainless steel, but is preferably made of a material having a lower thermal conductivity than the metal material, such as a resin or ceramic. This is because it is desired to prevent heat generated in the outside, for example, the engine, from entering the inside of the housing 21 and being transmitted to the IGBT.
A connector 28 is provided on the front end surface of the housing body 22. This connector 28 is connected to a power system unit 25 described later by an electric wire (not shown).

The heat sink 23 is made of a metal material having high thermal conductivity such as an aluminum alloy or a copper alloy. When the inverter unit 20 is assembled to the compressor main body 10, the heat radiating plate 23 comes into contact with the installation surface 13 of the housing main body 12 and promotes mutual heat exchange between the heat radiating plate 23 and the installation surface 13. Since the housing 21 has a lid that closes the opening of the housing main body 22 as the heat radiating plate 23, the inverter unit 20 can be downsized as compared with the case where a lid is separately provided.
The heat sink 23 is provided with a plurality of convex guides 24. The convex guide 24 is provided on the outer surface of the heat radiating plate 23, that is, the surface that contacts the installation surface 13. The convex guide 24 is formed corresponding to the concave guide 14 provided in the housing body 12 and has a trapezoidal shape in which the transverse section has a lower bottom longer than an upper bottom. Further, the convex guide 24 is formed from the front end to the rear end of the heat radiating plate 23 in parallel with the rotation axis C of the electric motor and the compression mechanism in a state where the convex guide 24 is assembled to the compressor body 10. The radiator plate 23 has a flat surface except for the convex guide 24.

The interior of the housing 21 is configured as follows, for example.
A power system unit 25 including an IGBT which is a power system heat generating element is installed on the heat sink 23. The power system unit 25 converts DC power into three-phase AC power and applies it to the electric motor. The power system unit 25 is arranged such that an IGBT that generates heat by converting power contacts the heat sink 23. The power system unit 25 is attached to the control board 26 by its leads. The three-phase AC power converted by the power system unit 25 is supplied to the electric motor via an electric wire (not shown).
A control board 26 is disposed above the power system unit 25. The control board 26 is mounted with a circuit having an element that operates at a low voltage such as a CPU (Central Processing Unit), and has a function of controlling AC power applied to the electric motor.
Although not shown in FIG. 2, a filter unit that includes at least one of a capacitor and a coil and suppresses noise of the inverter unit can be provided inside the inverter unit 20.
The control board 26 is fixed to the heat radiating plate 23 via a substantially gate-shaped support frame 27. The support frame 27 is fabricated so that the IGBT of the power system unit 25 attached to the control board 26 is in contact with the heat sink 23.

The compressor body 10 and the inverter unit 20 configured as described above are integrated as follows to constitute the inverter-integrated electric compressor 1.
The compressor body 10 so that each convex guide 24 of the inverter unit 20 is inserted into the corresponding concave guide of the housing body 12 in a state where the inverter unit 20 faces the compressor body 10 with the front sides facing each other. The inverter unit 20 is positioned with respect to (FIG. 3A). After positioning, the inverter unit 20 is pushed forward. While the convex guide 24 is inserted into the concave guide 14 and guided to each other, the inverter unit 20 slides on the installation surface 13 of the housing body 12 until the front end of the inverter unit 20 abuts against the contact surface 16 of the connector holder 15. When the inverter unit 20 moves until it abuts against the contact surface 16, the connector 17 on the compressor body 10 side and the connector 28 on the inverter unit 20 side are connected (FIG. 3B).

  If the connector 17 and the connector 28 can be firmly connected, even if vibration is applied to the inverter unit 20, the inverter unit 20 is not likely to be detached from the compressor body 10. However, in order to prevent the inverter unit 20 from separating from the compressor main body 10 more reliably, the bolt B whose head contacts the rear end of the inverter unit 20 can be fastened on the installation surface 13 of the housing main body 12. . The bolt B can be fastened to the housing body 12 via the concave guide 14.

<Effect>
In the inverter-integrated electric compressor 1 described above, the configuration relating to the inverter device is integrated into the inverter unit 20. In addition, when the convex guide 24 of the inverter unit 20 is inserted into the concave guide 14 of the housing main body 12 for assembling the inverter unit 20 to the compressor main body 10, the concave guide 14 and the convex guide 24 are placed on the installation surface 13. Since it is prevented from coming off in the orthogonal direction, the movement of the inverter unit 20 in the direction is restricted. Therefore, the inverter unit 20 is prevented from coming off upward, that is, prevented from being detached, without performing bolting or the like. Therefore, it is not necessary to use almost any fasteners such as bolts for assembling the inverter unit 20 to the compressor main body 10, so that the number of parts can be reduced. In addition, since the inverter unit 20 can be attached and detached as a unit, it is easy to replace one of the power system unit 25 and the control board 26 that constitute the inverter unit 20 due to a failure.

Further, in the inverter-integrated electric compressor 1, the inverter unit 20 is arranged so that the heat radiating plate 23 with which the power system unit 25 including the IGBT that generates heat is in contact with the installation surface 13 of the housing body 12. For this reason, the heat sink 23 is cooled via the installation surface 13 of the housing body 12 by the low-temperature and low-pressure refrigerant gas that is sucked into the housing body 12 from the suction port and flows around the electric motor. As a result, the heat radiating plate 23 becomes a heat sink, and the heat generated by the power system unit 25 is dissipated, so that a heat generating element such as an IGBT can be cooled. In particular, since a plurality of concave guides 14 and convex guides 24 are provided, the contact area between the installation surface 13 and the heat radiating plate 23 is wider than the contact between flat surfaces, and the cooling efficiency of the heat radiating plate 23 is improved. .
Therefore, the heat generating system parts (elements) that require cooling that constitute the inverter device can be reliably forcibly cooled by the low-temperature refrigerant gas, and the cooling function of the inverter unit 20 can be secured.

Further, the inverter-integrated electric compressor 1 performs electrical connection between the compressor main body 10 and the inverter-integrated electric compressor 1 by the connector 17 and the connector 28, and this connection connects the inverter unit 20 to the compressor. This is done in the process of assembling to the main body 10. Therefore, the work for electrical connection between the compressor body 10 and the inverter-integrated electric compressor 1 can be omitted.
The connection between the connector 17 and the connector 28 focuses on electrical connection. However, if the connector 17 and the connector 28 can be mechanically firmly connected, the inverter unit 20 can be prevented from coming off from the compressor body 10. It is effective for. In particular, in the case of the present embodiment, since the upper portion is prevented from coming off by the engagement of the concave guide 14 and the convex guide 24, if the connector 17 and the connector 28 are firmly connected, the horizontal direction is prevented from coming off. The The connection between the connector 17 and the connector 28 is not an essential element in the present invention.

  Next, the inverter-integrated electric compressor 1 can suppress heat inflow into the inverter unit 20 if the housing body 22 is made of a member having a lower thermal conductivity than the heat sink 23, such as resin or ceramic. Further, it is possible to prevent the power system unit 25, the control board 26, and the like constituting the inverter unit 20 from being heated more than necessary and failing. In addition, the member with low heat conductivity here is not restricted to the case where the heat conductivity of raw material itself is low. For example, even when a metal material is used, the thermal conductivity can be lowered by using a double structure in which an air layer is provided in the thickness direction.

  In the inverter-integrated electric compressor 1, the rotation axis C of the compressor body 10 and the extending direction of the convex guide 24 (concave guide 14) of the inverter unit 20 are parallel, but the present invention is not limited to this. . As shown in FIG. 4, the concave guide 14 is provided on the installation surface 13 of the housing main body 12 and the convex guide 24 is provided on the heat radiating plate 23 of the inverter unit 20 so as to be orthogonal to the rotation axis C of the compressor main body 10. Can be provided. Also in this case, the same effect as the inverter-integrated electric compressor 1 can be obtained.

[Second Embodiment]
Hereinafter, the inverter-integrated electric compressor 2 according to the second embodiment will be described with reference to FIG.
The inverter-integrated electric compressor 2 includes a compressor body 210 and an inverter unit 220.
The basic configuration of the compressor main body 210 is the same as that of the compressor main body 10 of the first embodiment, and the same reference numerals as those in FIGS. 1 to 3 are attached to the configuration, but the compressor main body 210 is an inverter unit. An installation surface 213 for installing 220 is formed on one side surface of the housing body 12 in the width direction.
The installation surface 213 is provided with a plurality of concave guides 214 extending in the vertical direction. Unlike the first embodiment, the opening shape of the concave guide 214 has a rectangular shape on the surface side of the installation surface 213 and a subsequent portion having a circular shape with a diameter larger than the width of the rectangular shape.
A connector holder 215 is provided on the installation surface 213. The connector holder 215 protrudes in the width direction from the installation surface 213 and includes an upward contact surface 216. The connector holder 215 is provided with an upward connector 217 that opens to the contact surface 216.

The inverter unit 220 is the same as the inverter unit 20 of the first embodiment except that the shape of the convex guide 24 is different and the assembly position with respect to the compressor body 210 is different. -The same code | symbol as FIG. 3 is attached | subjected.
The convex guide 224 of the inverter unit 220 corresponds to the opening shape of the concave guide 214 of the compressor main body 210, and the surface side of the heat radiating plate 23 is a rectangle, and the subsequent portion is a circle having a diameter larger than the width of the rectangle. ing.

  In order to assemble the inverter unit 220 to the compressor main body 210, each convex guide 224 of the inverter unit 220 corresponds to the concave guide of the housing main body 12 while maintaining the posture of the inverter unit 220 so that the connector 28 faces downward. The inverter unit 220 is positioned with respect to the compressor body 210 so as to be inserted into the compressor body 210. After positioning, the inverter unit 220 is lowered and the convex guide 224 is inserted into the concave guide 214. While the convex guide 224 and the concave guide 214 are guided to each other, the inverter unit 220 is lowered until the front end thereof abuts against the contact surface 216 of the connector holder 215. When the inverter unit 220 is lowered until it abuts against the contact surface 216, the connector 217 on the compressor body 210 side and the connector 28 on the inverter unit 220 side are connected (FIG. 5).

The above inverter-integrated electric compressor 2 also has the following effects as in the first embodiment.
(1) The number of parts is reduced, and the burden of work for replacing the inverter unit 220 is reduced. In the second embodiment, since the convex guide 224 and the concave guide 214 are prevented from coming off in a direction perpendicular to the installation surface 213, bolting for supporting the inverter unit 220 in this direction is not necessary.
(2) The cooling function of the inverter unit 220 can be secured.
(3) Work for electrical connection between the compressor body 210 and the inverter-integrated electric compressor 2 can be omitted, and if the connector 17 and the connector 28 are firmly connected, the operation in the vertical direction can be performed. A retaining is secured. Particularly in the case of this embodiment, since the inverter unit 220 is supported in the vertical direction by the connector holder 215, the bolt B used in the first embodiment for more reliably preventing the horizontal displacement. Even if it is not, there is no possibility that the inverter unit 220 will come out vertically upward.
(4) If the housing body 22 is made of a material having a lower thermal conductivity than the heat sink 23, such as resin or ceramic, the power system unit 25, the control board 26, etc. constituting the inverter unit 20 will be heated more than necessary and will fail. Can be prevented.

  In the inverter-integrated electric compressor 2, the rotation axis C of the compressor main body 210 and the extending direction of the convex guide 224 (concave guide 214) of the inverter unit 220 are orthogonal to each other, but the present invention is not limited to this. As shown in FIG. 6, a concave guide 214 is provided on the installation surface 213 of the housing main body 12 and a convex guide is provided on the heat radiating plate 223 of the inverter unit 220 so as to be parallel to the rotation axis C of the compressor main body 210. 224 may be provided.

The preferred embodiment of the inverter-integrated electric compressor according to the present invention has been described above.
Among them, the position of the compressor main body where the inverter unit is installed is arbitrary, but when selecting which position, the work for removing the inverter unit from the compressor main body should be considered. That is, the inverter-integrated electric compressor installed in the automobile has a number of other parts and members around it, and therefore there is a region where a space necessary for removing the inverter unit cannot be secured. Therefore, it is preferable to arrange the inverter unit corresponding to a region where a space necessary for removing the inverter unit can be secured.

Further, in the first embodiment, an example is shown in which the rear end of the inverter unit 20 is restrained by a bolt B in order to prevent the inverter unit 20 from coming off in the horizontal direction, but as shown in FIG. It is possible to utilize locking of the electric wire 30 for supplying DC power from the main power supply (battery) to be omitted to the compressor body 10.
That is, the connector 31 provided at the tip of the electric wire 30 is connected to the main power supply connector (not shown) provided in the inverter unit 20. A U-shaped locking body 32 surrounding the periphery of the connector 31 is fixed to the compressor body 10 with a fastener such as a bolt B. That is, the locking body 32 can serve as both a stopper for the connector 31 and a stopper for the inverter unit 20.
Other than this, as long as the gist of the present invention is not deviated, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate. For example, the shape of the concave guide and the convex guide is arbitrary, and the object of the present invention can be achieved if it is prevented from coming off in a direction perpendicular to the installation surface by meshing. In the above, the concave guide is provided on the compressor body side and the convex guide is provided on the inverter unit side, but the side on which the concave guide and the convex guide are provided is arbitrary, and the concave guide is provided on the inverter unit side. A convex guide can also be provided on the compressor body side. Furthermore, although a plurality of concave guides and convex guides are provided in the above, the present invention includes providing only a pair of concave guides and convex guides.

1, 2 ... Inverter-integrated electric compressor,
DESCRIPTION OF SYMBOLS 10,210 ... Compressor main body, 11 ... Housing, 12 ... Housing main body, 13, 213 ... Installation surface, 14, 214 ... Concave guide, 15, 215 ... Connector holder, 16, 216 ... Contact surface, 17, 217 …connector,
DESCRIPTION OF SYMBOLS 20,220 ... Inverter unit, 21 ... Housing, 22 ... Housing main body, 23 ... Heat sink, 24, 224 ... Convex guide, 25 ... Power system unit, 26 ... Control board, 27 ... Support frame, 28 ... Connector

Claims (6)

An inverter unit that houses a member constituting the inverter device in a housing independent of the compressor body;
The compressor body including an installation surface on which the inverter unit is detachably installed, and
The inverter unit is
The housing includes a heat radiating portion on a surface that contacts the installation surface of the compressor body, and an electric element serving as a heat generating element is disposed so as to contact the heat radiating portion,
A convex guide is provided on one of the installation surface of the compressor main body and the heat radiating portion of the inverter unit, and a concave guide that is prevented from coming off from the convex guide is provided on the other.
An inverter-integrated electric compressor characterized by that. The concave guide has a trapezoidal shape in which the opening cross section is longer in the lower base than in the upper base,
The inverter-integrated electric compressor according to claim 1.   2. The inverter-integrated electric compressor according to claim 1, wherein the concave guide has a rectangular shape on the surface side and a circular portion having a larger diameter than the rectangular shape. The housing of the inverter unit has a lower thermal conductivity than the heat radiating portion, except for the heat radiating portion,
The inverter-integrated electric compressor according to any one of claims 1 to 3. The inverter unit is disposed on the upper surface of the compressor body.
The inverter-integrated electric compressor according to any one of claims 1 to 4. The inverter unit is disposed on a side surface of the compressor body.
The inverter-integrated electric compressor according to any one of claims 1 to 5.

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