JP2014077403A - Motor compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor compressor which radiates heat generated from a power module, prevents the damage of a sheet, and secures the insulation quality of the sheet.SOLUTION: A motor compressor includes: a housing formed into a substantially cylindrical shape; a compression mechanism which compresses a refrigerant; an electric motor part which is rotated by a magnetic force; and an inverter part having a power module and a heat radiation sheet. Pins are formed at an outer periphery of the power module so as to protrude therefrom. The heat radiation sheet is held between the power module and the housing to be fixed thereto and is arranged so as to cover a protruding range of the pins. The motor compressor is provided with holding means for holding end parts of the heat radiation sheet.

Description

  The present invention relates to a compressor in which an inverter is disposed at an end of a compressor.

  As shown in Patent Document 1 and the like, an electric compressor has an inverter case that accommodates an inverter part at an end of a housing that accommodates a compressor that compresses gas.

  In addition, as described in Patent Document 1, the inverter case is configured such that a power module substrate of a heat generating electrical component that is a control circuit substrate and a CPU substrate on which an element that operates at a low voltage is mounted overlap each other. It is stored and arranged. The bottom of the inverter case on which these substrates are arranged constitutes the outer wall of the housing, and a heat radiation flat portion parallel to the power module substrate and the CPU substrate is formed. The power module substrate is a heat conductive substrate, and heat generated from the power module substrate is radiated to the inverter case by fixing it to the upper surface of the heat radiation flat portion with a heat conductive insulating sheet with a plurality of screws. doing.

JP 2012-92747 A

  However, as shown in FIG. 5, when the pin 390 protrudes from the power module main body 370 of the power module 310, a magnetic force is generated from the pin 390. Therefore, the protruding range O of the pin 390 protruding from the power module 310 is also a sheet. 290 had to be extended to maintain insulation.

  In addition, the seat 290 is sandwiched between the power module 310 and the inverter case 110 and is fixed to the inverter case 110 by bolts 410, but the protruding range of the pin 390 other than the range S sandwiched by the power module 310. The O sheet 290 was not fixed, and the end 290a was a free end.

  Further, in the electric compressor, vibration of the compression mechanism or the like is generated, so that the end 290a where the seat 290 is not fixed is moved by vibration of the compression mechanism or the like, and the range S sandwiched by the power module 310 and the protrusion of the pin 390 There is a problem that a load is applied to the boundary portion of the range O and the sheet 290 is cut in the worst case.

  Further, although it is conceivable to adhere the sheet 290 to the inverter case 110 with an adhesive or the like, the heat dissipation of the sheet 290 cannot be ensured.

  In order to prevent the free end of the seat 290 from moving, it is conceivable to use a rigid seat for the seat 290. However, since the inverter case 110 itself thermally expands when the electric compressor is driven, the seat 290 is used. It was not preferable to use a rigid body.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an electric compressor that can dissipate heat generated from a power module, prevent damage to the seat, and ensure insulation of the seat.

  In order to solve the above problems, the present invention includes a housing 2 formed in a substantially cylindrical shape, a compression mechanism 3 that compresses a refrigerant, an electric motor unit 4 that rotates by magnetic force, a power module 31, and a heat dissipation sheet 29. An electric compressor 1 having an inverter unit 5 having a pin 39 projecting from the outer periphery of the power module 31, and the heat dissipating sheet 29 is formed between the power module 31 and the housing 2. The holding means 33 is provided so as to sandwich and fix the end portion 29a of the heat-dissipating sheet 29 and to be fixed so as to cover the protruding range of the pin 39.

  Further, the holding means 33 is characterized by being fixed by caulking.

  Further, the housing 2 is provided with holding portions 33A, 33B, and 33C, and the holding portions 33A, 33B, and 33C are deformed and fixed by caulking.

  In the present invention, by providing the holding means 33 for holding the end portion 29a of the heat radiating sheet 29, the end portion 29a of the heat radiating sheet 29 does not move, and the heat radiating sheet 29 can be prevented from being damaged.

  Further, the holding portions 33A, 33B, and 33C are provided in the housing 2, and the holding portions 33A, 33B, and 33C are deformed and fixed by caulking, so that there is no need to newly provide a fixing member, and the holding portions 33A, 33B, and 33C are provided. The heat-dissipating sheet 29 can be securely fixed simply by deforming and fixing.

  Furthermore, since the heat dissipation sheet 29 is fixed by the holding portions 33A, 33B, and 33C provided in the housing 2, the positioning of the heat dissipation sheet 29 can be facilitated.

The whole sectional view of the electric compressor of the present invention. (A) Simplified top view of the inverter part of the present invention, (b) AA line sectional view of FIG. 2 (a) before mounting of the heat dissipating sheet and AA line cross sectional view after mounting of the heat dissipating sheet. (A) Simplified top view of the inverter part of the second embodiment, (b) AA line cross-sectional view of FIG. 3 (a) before mounting of the heat dissipation sheet, and AA line cross section after mounting of the heat dissipation sheet Figure. (A) Simplified top view of the inverter part of the third embodiment, (b) AA line sectional view of FIG. 4 (a) showing the state before the heat radiating sheet is attached, and AA line cross section after the radiating sheet is attached. Figure. (A) The simplified top view which shows the conventional inverter part, (b) The simplified sectional view of the conventional inverter part.

[Example 1]
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that the holding portions 33 </ b> A, 33 </ b> B, and 33 </ b> C described in the first to third embodiments are the holding means 33.

  As shown in FIG. 1, the electric compressor 1 includes a housing 2 formed in a substantially cylindrical shape, a compression mechanism 3 that compresses refrigerant, an electric motor unit 4 that rotates by magnetic force, a power module 31, and a heat dissipation sheet 29. And an inverter unit 5 having

  The housing 2 includes a front case 7 that houses the electric motor unit 4, a middle case 9 that houses the compression mechanism 3, and a lower case 11 that houses the inverter unit 5.

  A lower case cover 32 is attached to the lower case 11 so as to close the opening of the lower case 11 to seal the interior of the lower case 11. In addition, a holding portion 33 </ b> A for attaching an inverter portion 5 described later is formed on the outer wall 30 of the lower case 11.

  The compression mechanism 3 housed in the middle case 9 is rotatable in the cylinder chamber 35, the cylinder block 13 having the cylinder chamber 35 on the inner periphery, the side block 15 arranged to sandwich the cylinder block 13, and the cylinder chamber 35. The rotor 19 is housed in the rotor 19, the vane 17 is housed in a vane groove (not shown) provided in the rotor 19, and the drive shaft 21 is integrally formed with the rotor 19 and rotates. Further, the cylinder chamber 35 is formed by sandwiching both ends of the cylinder block 13 by the front side block 15a and the rear side block 15b.

  The drive shaft 21 formed integrally with the rotor 19 disposed in the cylinder chamber 35 is fixed at one end side by a motor shaft 27 and a spline connection which will be described later.

  The electric motor unit 4 accommodated in the front case 7 includes a stator 23 having a coil wound around a core, a motor rotor 25 formed of a magnetic material, and a motor shaft 27 having one end fixed to the drive shaft 21. It is configured. A plurality of stators 23 are arranged at equal intervals along the inner periphery of the front case 7, and a motor shaft 27 is press-fitted and connected to the motor rotor 25. The drive of the electric motor unit 4 is controlled by the inverter unit 5.

  The inverter unit 5 accommodated in the lower case 11 includes an insulating heat dissipating sheet 29 disposed on the outer wall 30 of the lower case 11 and a power module 31 that controls the electric motor unit 4. In addition, the heat radiating sheet 29 has an insulating property and also a heat radiating property. Moreover, in order to improve heat dissipation performance, the heat dissipation sheet 29 is preferably soft.

  As shown in FIGS. 2A and 2B, the power module 31 includes a power module main body 37, a plurality of pins 39 formed so as to protrude from the power module main body 37, and the power module 31 as a lower case of the housing 2. 11, and a bolt 41 that is fixed to 11. The heat dissipation sheet 29 is disposed so as to cover the range of the power module main body 37 and the pins 39 protruding from the power module main body 37. The heat dissipating sheet 29 has an insulating property, and is sandwiched between the power module 31 and the lower case 11, so that the compression mechanism 3 and the electric motor housed inside the lower case 11, that is, in the housing 2. The influence of the magnetic force on the part 4 is prevented.

  The end portion 29 a of the heat radiating sheet 29 is held by deforming a holding portion 33 </ b> A formed on the outer wall 30 of the lower case 11 of the housing 2. That is, as shown in FIG. 2B, the heat radiating sheet 29 is held between the holding portion 33 </ b> A and the lower case 11 by folding the holding portion 33 </ b> A inward and deforming the holding portion 33 </ b> A.

  Further, the holding portion 33A formed so as to protrude from the outer wall 30 of the lower case 11 holds the opposite end portions 29a of the heat dissipation sheet 29 by the holding portion 33A. Since the lower case 11 is generally formed of aluminum, the holding portion 33A provided integrally with the lower case 11 is preferably formed by die casting or the like.

  Next, attachment of the inverter unit 5 to the lower case 11 will be described.

  First, the heat dissipation sheet 29 is disposed on the outer wall 30 of the lower case 11. At this time, by positioning the end portion 29a of the heat dissipation sheet 29 against the holding portion 33A protruding from the lower case 11, the heat dissipation sheet 29 can be easily positioned.

  Next, the power module 31 is placed on the heat dissipation sheet 29. Then, the power module 31 is placed on the heat radiating sheet 29, and the bolt 41 is screwed into the power module main body 37 and the lower case 11 in which bolt holes (not shown) are formed, and the power module 31 is fixed to the lower case 11.

  Finally, the holding portion 33A formed to protrude from the lower case 11 is deformed and fixed by caulking, and the opposite end portions 29a of the heat radiation sheet 29 are fixed, and the installation of the inverter portion 5 is completed.

  By setting it as such a structure, the edge part 29a of the thermal radiation sheet 29 does not move, and damage to the thermal radiation sheet 29 can be prevented.

  Further, the holding part 33A is provided in the lower case 11 of the housing 2, and the holding part 33A is deformed and fixed by caulking, so that it is not necessary to newly provide a fixing member. The heat radiating sheet 29 can be fixed.

  Furthermore, since the heat radiating sheet 29 is fixed by the holding portion 33 </ b> A provided in the lower case 11 of the housing 2, the positioning of the heat radiating sheet 29 can be facilitated.

  In addition, even if it is vibration generated by driving the electric compressor 1 or vibration generated when the vehicle is mounted, the heat radiating sheet 29 can be reliably fixed by the holding portion 33A, so that insulation can be maintained. Moreover, damage to the heat dissipation sheet 29 can be prevented.

  In the present embodiment, the holding portions 33A are arranged at the end portions 29a of the two heat radiation sheets 29 facing each other, but the holding portions 33A may be arranged on all four sides.

  Further, in this embodiment, the heat radiation sheet 29 is held by the holding portion 33A to mechanically hold the heat radiation sheet 29. However, other mechanical components such as attaching a case covering the heat radiation sheet 29 are used. The heat dissipation sheet 29 may be held by holding.

[Example 2]
The electric compressor 1 which concerns on Example 2 is demonstrated using FIG. Note that the description of the same configuration as that of the first embodiment is omitted.

  As shown in FIGS. 3A and 3B, the holding portion 33 </ b> B of the present embodiment is provided with three holding portions 33 </ b> B at two opposite end portions 29 a of the heat radiation sheet 29 on each side. .

  In this embodiment, three holding portions 33B are provided for one side of the heat dissipation sheet 29. However, two holding portions 33B or more may be provided, and the holding portions 33B may be provided at symmetrical positions. It is desirable to provide

  By adopting such a configuration, the same effect as in the first embodiment can be obtained.

Example 3
The electric compressor 1 according to the third embodiment will be described with reference to FIG. Note that the description of the same configuration as that of the first embodiment is omitted.

  As shown in FIGS. 4A and 4B, the holding portion 33 </ b> C of the present embodiment has two holding portions 33 </ b> C at the opposite end portions 29 a of the heat radiation sheet 29, one on each side, and the other facing portions. Two holding portions 33C are provided on each side of the end portions 29a of the two sides.

  By adopting such a configuration, the same effect as in the first embodiment can be obtained.

  In the present embodiment, the holding portion 33C is provided at each of the two opposite end portions 29a of the heat dissipation sheet 29, and the holding portion 33C is provided at each of the other two opposite end portions 29a. Although two portions are provided, any number of the holding portions 33C may be provided as long as the holding portions 33C are provided at the symmetrical positions of the heat radiation sheet 29 as in the second embodiment. Further, four holding portions 33 </ b> C may be provided at the corners of the heat dissipation sheet 29. Further, the holding portion 33C may be provided at a location where the vibration of the heat dissipation sheet 29 is assumed to be large.

  The present invention can be used for an electric compressor.

DESCRIPTION OF SYMBOLS 1 Electric compressor 2 Housing 3 Compression mechanism 4 Electric motor part 5 Inverter part 7 Front case 9 Middle case 11 Lower case 29 Radiating sheet 29a End part 31 Power module 33 Nipping means 39 Pin

Claims (3)

An inverter having a housing (2) formed in a substantially cylindrical shape, a compression mechanism (3) for compressing a refrigerant, an electric motor section (4) that rotates by magnetic force, a power module (31), and a heat dissipation sheet (29) An electric compressor (1) comprising a section (5),
On the outer periphery of the power module (31), a pin (39) is formed to protrude,
The heat dissipating sheet (29) is nipped and fixed between the power module (31) and the housing (2), and is disposed so as to cover the protruding range of the pin (39),
An electric compressor (1) characterized in that a holding means (33) for holding an end (29a) of the heat radiation sheet (29) is provided. An electric compressor (1) according to claim 1,
The electric compressor (1), wherein the holding means (33) is fixed by caulking. The electric compressor (1) according to claim 1 or 2,
An electric compressor (1) characterized in that a holding portion (33A, 33B, 33C) is provided in the housing (2), and the holding portion (33A, 33B, 33C) is deformed and fixed by caulking.

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