JP2004100683A - Electric compressor - Google Patents

Electric compressor Download PDF

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Publication number
JP2004100683A
JP2004100683A JP2003035654A JP2003035654A JP2004100683A JP 2004100683 A JP2004100683 A JP 2004100683A JP 2003035654 A JP2003035654 A JP 2003035654A JP 2003035654 A JP2003035654 A JP 2003035654A JP 2004100683 A JP2004100683 A JP 2004100683A
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JP
Japan
Prior art keywords
switching element
housing
motor drive
drive circuit
compressor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2003035654A
Other languages
Japanese (ja)
Inventor
Kitaru Iwata
Kazuya Kimura
Kazuhiro Kuroki
Takeshi Mizufuji
Hiroyuki Motonami
Masanori Sonobe
元浪 博之
園部 正法
岩田 来
木村 一哉
水藤 健
黒木 和博
Original Assignee
Toyota Industries Corp
株式会社豊田自動織機
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP2002205272 priority Critical
Application filed by Toyota Industries Corp, 株式会社豊田自動織機 filed Critical Toyota Industries Corp
Priority to JP2003035654A priority patent/JP2004100683A/en
Publication of JP2004100683A publication Critical patent/JP2004100683A/en
Application status is Pending legal-status Critical

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008Hermetic pumps
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00Piston pumps characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04Piston pumps characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04CROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C2240/00Components
    • F04C2240/80Other components
    • F04C2240/808Electronic circuits (e.g. inverters) installed inside the machine

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric compressor capable of accomplishing excellent heat dissipation for a switching element with an inexpensive structure. <P>SOLUTION: The electric compressor houses a compression mechanism in a compressor housing (hereinafter referred to as a housing) 21. The compression mechanism is driven by an electric motor to compress refrigerating gas. A cover member 38 is jointed to the outside of the housing 21. A motor driving circuit 41 for driving the electric motor is housed in a housing space 35 partitioned with the housing 21 and the cover member 38. In the circuit 41, the switching element 44A is mounted on a surface 43a of an opposite side to the cover member 38 (a top surface 35b). The switching element 44A is pressed down to the housing 21 by tightening of a motor driving circuit 41 between the housing 21 and the member 38 in the housing space 35 resulting from jointing the cover member 38 with the housing 21. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric compressor used for a vehicle air conditioner, for example.
[0002]
[Prior art]
As this type of electric compressor, there is one in which an inverter for driving an electric motor is attached to a surface of a compressor housing (for example, see Patent Document 1). In the technique of Patent Document 1, heat exchange between a low-temperature refrigerant flowing in an electric compressor and a switching element constituting the inverter is performed through a compressor housing as a measure against heat generation of the inverter. Have been. Therefore, there is an advantage that cooling the inverter does not require a complicated configuration such as a radiator or a blower.
[0003]
[Patent Document 1]
CD-ROM of Japanese Utility Model Application Laid-Open No. Sho 62-12471 (page 1, FIG. 2)
[0004]
[Problems to be solved by the invention]
However, when the configuration as described in Patent Document 1 is employed, generally, a plurality of switching elements are directly attached to the outer surface of the compressor housing by bolting. Therefore, a bolt is required for each switching element, so that the number of parts and the number of assembling steps are increased, and it is necessary to form a plurality of screw holes into which the bolts are screwed in the compressor housing. Therefore, there has been a problem that the manufacturing cost of the electric compressor increases.
[0005]
In addition, when the configuration as described in Patent Document 1 is employed, generally, after each switching element is mounted on the compressor housing, wiring for each switching element and mounting of other electric components on the compressor housing are performed. It will be. However, assembling each component of the inverter to the compressor housing requires delicateness, and the assembling process of the mechanical part of the electric compressor, which can not be denied a rough feeling compared to the process, includes the manufacturing line configuration and the manufacturing process. Some settings are incompatible with the setting of line flow.
[0006]
Therefore, in order to assemble the inverter with high precision on the compressor housing, it is necessary to perform this step separately from the step of assembling the mechanical part. However, in this case, the compressor housing, that is, a large component must be moved between the lines, which is troublesome. Therefore, there has been a problem that the manufacturing cost of the electric compressor increases.
[0007]
Further, as described above, when assembling the inverter on the compressor housing, there is a problem that it is difficult to check the operation of the inverter. That is, when the operator performs the operation for confirming the operation of the completed inverter, the compressor housing must be handled together, which is troublesome. This also led to an increase in the manufacturing cost of the electric compressor.
[0008]
An object of the present invention is to provide an electric compressor that can achieve good heat radiation of a switching element with an inexpensive configuration.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, in the electric compressor according to the first aspect of the present invention, a circuit cover is joined and fixed outside the compressor housing. A motor drive circuit for driving the electric motor is housed in a housing space surrounded by the compressor housing and the circuit cover. The motor drive circuit has a switching element mounted on the surface of the substrate opposite to the circuit cover.
[0010]
The switching element is pressed against and tightly attached to the compressor housing by tightening the motor drive circuit between the two (compressor housing and circuit cover) in the accommodation space due to the joining and fixing of the circuit cover to the compressor housing. ing. As described above, by pressing the switching element against the compressor housing, heat exchange between the switching element and the relatively low-temperature compressor housing is efficiently performed. Therefore, the heat dissipation of the switching element is improved, and the operation of the motor drive circuit is stabilized.
[0011]
The pressing of the switching element against the compressor housing is achieved by tightening the motor drive circuit between the two in the housing space due to the joining and fixing of the circuit cover to the compressor housing. Therefore, there is no need to directly bolt the switching element to the compressor housing as in the case of employing the configuration of Patent Document 1. Further, a procedure of mounting the motor drive circuit on the compressor housing after assembling the motor drive circuit can be adopted, and as in the case of employing the configuration of Patent Document 1, assembling the inverter on the compressor housing. Various troubles caused by this can be avoided. Therefore, the electric compressor can be provided at a low cost by providing the above-described configuration for improving the heat dissipation of the switching element.
[0012]
According to a second aspect of the present invention, in the first aspect, an elastic member is interposed between at least one of the compressor housing and the switching element of the motor drive circuit and between at least one of the circuit cover and the motor drive circuit. Therefore, for example, even if the switching elements vary in height on the substrate due to dimensional tolerances, the variation in height of the switching elements is absorbed by the elastic deformation of the elastic member. Therefore, the switching element can be securely brought into close contact with the compressor housing. This leads to an improvement in heat radiation of the switching element and a stable arrangement of the motor drive circuit in the accommodation space.
[0013]
According to a third aspect of the present invention, in the first or second aspect, a board support member is provided between the circuit cover and the board of the motor drive circuit, for supporting the vicinity of the switching element on the board. Therefore, the load acting on the switching element due to pressing it against the compressor housing is received by the circuit cover via the board and the board support member. Therefore, the occurrence of bending of the substrate near the switching element due to the load is prevented by the backup support of the substrate support member.
[0014]
According to a fourth aspect of the present invention, the pressing force of the switching element against the compressor housing is adjusted by adjusting the thickness of the board support member between the circuit cover and the board. As described above, the configuration of the electric compressor can be simplified by using the substrate support member also as a pressing force adjusting unit of the switching element.
[0015]
According to a fifth aspect of the present invention, in any one of the first to fourth aspects, in the motor drive circuit, an element support member that supports the switching element on the substrate as a backup is interposed between the substrate and the switching element. Therefore, a load acting on the switching element due to pressing the switching element against the compressor housing is preferably received by the board via the element support member. Therefore, even with the structure in which the switching element (main body) is floated from the board, it is possible to prevent the stress caused by the load from being concentrated on the soldered portion of the switching element (mounting foot) on the board. The structure in which the switching element (main body) is lifted from the substrate has the advantage described in, for example, claim 6.
[0016]
That is, according to a sixth aspect of the present invention, in the fifth aspect, the thickness of the element support member between the substrate and the switching element, that is, the height of the switching element on the substrate (the degree of floating of the main body) is adjusted, so that the compressor is improved. The pressing force of the switching element against the housing is adjusted. As described above, the configuration of the electric compressor can be simplified by using the element support member also as a pressing force adjusting unit of the switching element.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, first to fourth embodiments will be described in which the present invention is embodied in an electric compressor included in a refrigeration cycle of a vehicle air conditioner. In the second to fourth embodiments, only differences from the first embodiment will be described, and the same or corresponding members will be denoted by the same reference numerals and description thereof will be omitted.
[0018]
○ 1st embodiment
As shown in FIGS. 1 and 2, a compressor housing 11 that forms an outer shell of the electric compressor 10 includes a first housing component 21 and a second housing component 22. The first housing component 21 has a bottomed cylindrical shape with a bottom formed on the left side of the substantially cylindrical peripheral wall 23 in the drawing, and is made of an aluminum alloy die casting. The second housing component 22 has a closed cylindrical shape with a lid on the right side of the drawing, and is manufactured by die casting of an aluminum alloy. A sealed space 24 is formed in the compressor housing 11 by joining and fixing the first housing component 21 and the second housing component 22.
[0019]
As shown in FIG. 1, a rotating shaft 27 is rotatably supported by a first housing component 21 in a closed space 24 of the compressor housing 11. The rotation center axis L of the rotation shaft 27 forms the center axis L of the electric compressor 10. The peripheral wall 23 of the first housing component 21 is disposed so as to surround the central axis L of the electric compressor 10.
[0020]
An electric motor 12 and a compression mechanism 14 are housed in a closed space 24 of the compressor housing 11. The electric motor 12 includes a stator 12a fixed to the inner surface of the peripheral wall 23 in the first housing component 21, and a rotor 12b provided on the rotating shaft 27 inside the stator 12a. The electric motor 12 rotates the rotating shaft 27 by receiving power supplied to the stator 12a.
[0021]
The compression mechanism 14 is of a scroll type having a fixed scroll 14a and a movable scroll 14b. The compression mechanism 14 compresses the refrigerant gas by turning the movable scroll 14b with respect to the fixed scroll 14a according to the rotation of the rotation shaft 27. Accordingly, when the compression mechanism 14 is operated by driving the electric motor 12, the low-temperature and low-pressure refrigerant gas from the external refrigerant circuit (not shown) is supplied to the suction port 31 (see FIG. 2) formed in the first housing structure 21. ) Is drawn into the compression mechanism 14 via the vicinity of the electric motor 12 in the closed space 24. The refrigerant gas sucked into the compression mechanism 14 becomes a high-temperature and high-pressure refrigerant gas by the compression action of the compression mechanism 14 and is discharged from the discharge port 32 formed in the second housing component 22 to the external refrigerant circuit.
[0022]
The reason that the refrigerant gas from the external refrigerant circuit is introduced into the compression mechanism 14 via the vicinity of the electric motor 12 in the closed space 24 is that the electric motor 12 and the This is for cooling a motor drive circuit 41 described later.
[0023]
As shown in FIGS. 2 and 3, a housing portion 36 having a housing space 35 therein is protruded from a part of the outer surface of the peripheral wall 23 in the first housing structure 21. The accommodating portion 36 includes a frame-shaped side wall portion 37 integrally formed from the outer surface of the peripheral wall 23 and a metal lid member 38 as a circuit cover joined to a distal end surface of the side wall portion 37. I have. The four corners of the cover member 38 are fixed to the side wall 37 by bolts 39.
[0024]
As shown in FIG. 3, a bottom surface 35a of the housing space 35 is an outer surface of the peripheral wall 23. That is, the bottom surface 35 a of the accommodation space 35 is provided by the first housing component 21. The top surface 35 b of the storage space 35 is provided by a lid member 38.
[0025]
A motor drive circuit 41 for driving the electric motor 12 is accommodated in the accommodation space 35 of the accommodation section 36. The motor drive circuit 41 includes an inverter, and supplies electric power to the stator 12a of the electric motor 12 based on a command from an air conditioner ECU (not shown).
[0026]
The motor drive circuit 41 includes a flat board 43, and a plurality of types of electrical components 44 mounted on a surface 43a on the center axis L side and a surface 43b on the opposite side of the center axis L in the board 43, respectively. ing. The electrical component number "44" is a generic name for electrical components 44A to 44E described later and other electrical components (not shown).
[0027]
Examples of the electric component 44 include well-known components constituting an inverter, that is, a switching element 44A, an electrolytic capacitor 44B, a transformer 44C, a driver 44D, a fixed resistor 44E, and the like. The driver 44D is an IC chip that controls the switching element 44A on and off based on a command from the air conditioner ECU.
[0028]
On the surface 43b of the substrate 43 opposite to the center axis L side, that is, the surface 43b of the lid member 38, the height from the substrate 43 (the height from the surface 43b) is the height of the switching element 44A (the surface 43b). , Only the electric components 44 that are lower than the height (assuming that the electric components 44 are disposed at the same position). Examples of the electric component 44 whose height from the substrate 43 is lower than the switching element 44A include a driver 44D and a fixed resistor 44E.
[0029]
On the surface 43a of the substrate 43 on the side of the central axis L, that is, the surface 43a opposite to the lid member 38, a plurality of switching elements 44A and a height from the substrate 43 higher than the switching elements 44A (a height from the surface 43a). And an electric component 44 having a higher height. Examples of the electrical component 44 whose height from the substrate 43 is higher than the switching element 44A include an electrolytic capacitor 44B and a transformer 44C.
[0030]
On the surface 43a of the substrate 43, a small electrical component such as a switching element 44A is arranged at the center of the drawing near the center axis L. On the surface 43a of the substrate 43, high-sized electrical components such as an electrolytic capacitor 44B and a transformer 44C are arranged on both sides of a central portion away from the central axis L. With such an arrangement, the motor drive circuit 41 can be mounted on the compressor housing 11 such that the group of electrical components 44 mounted on the surface 43a side of the substrate 43 follows the substantially cylindrical shape of the peripheral wall 23. It is.
[0031]
Therefore, the motor drive circuit 41 is arranged closer to the center axis L of the electric compressor 10 by the amount by which the group of electric components 44 follows the cylindrical shape of the peripheral wall 23. Therefore, the amount of protrusion of the housing portion 36 from the compressor housing 11 can be reduced, and the size of the electric compressor 10 can be reduced.
[0032]
On the bottom surface 35a of the housing space 35, a central region 35a-1 corresponding to the switching element 44A is formed in a planar shape close to the lid member 38 and parallel to the top surface 35b. On the bottom surface 35a of the housing space 35, recesses 35a-2 for housing the electrolytic capacitors 44B and the transformer 44C with a gap are provided on both sides of the region 35a-1, that is, in regions corresponding to the high-sized electrolytic capacitors 44B and the transformer 44C. Each is formed.
[0033]
The motor drive circuit 41 is fixed in the housing space 35 by tightening the vicinity of the switching element 44A between the two 21 and 38 due to the joining and fixing of the lid member 38 to the first housing component 21. ing. By tightening the motor drive circuit 41 between the first housing component 21 (the bottom surface 35a of the housing space 35) and the lid member 38 (the top surface 35b), each switching element 44A of the circuit 41 is turned into a heat radiation surface 44A. -1 is pressed against the bottom surface 35a (region 35a-1) of the housing space 35.
[0034]
On the surface 43b of the substrate 43 opposite to the central axis L side, a resin-made and plate-shaped substrate support member 47 is joined to a position adjacent to each switching element 44A with the substrate 43 interposed therebetween. Fixed. The height of the board support member 47 from the surface 43b is higher than any of the electric components 44 mounted on the surface 43b. Therefore, the load acting on the switching element 44A due to pressing the switching element 44A against the bottom surface 35a of the housing space 35 is received by the lid member 38 via the board 43 and the board support member 47. Therefore, the bending of the substrate 43 near each switching element 44A due to the load is prevented by the direct backup support by the substrate support member 47.
[0035]
A rubber sheet (elastic member) 45 having excellent insulation, elasticity, and heat conductivity is interposed between the switching element 44A and the bottom surface 35a (region 35a-1) of the housing space 35. Therefore, the switching element 44 </ b> A is pressed against and adhered to the bottom surface 35 a of the housing space 35 via the sheet 45. A rubber sheet (elastic member) 46 having excellent insulation and elasticity is interposed between the substrate support member 47 and the top surface 35b of the storage space 35. Therefore, the substrate support member 47 is pressed against the top surface 35 b of the storage space 35 via the sheet 46.
[0036]
The present embodiment having the above configuration has the following effects.
(1) Each switching element 44A of the motor drive circuit 41 is pressed against and adhered to the bottom surface 35a of the space 35, that is, the first housing component 21, in the accommodation space 35. Therefore, heat exchange between the switching element 44A and the first housing component 21 having a relatively low temperature due to the flow of the low-temperature suction refrigerant gas inside is efficiently performed. Therefore, the heat radiation of the switching element 44A is improved, and the operation of the motor drive circuit 41 is stabilized.
[0037]
The pressing of each switching element 44A against the first housing component 21 is caused by the joining and fixing of the lid member 38 to the first housing component 21, which causes the motor drive circuit 41 to move between the two 21 and 38 in the housing space 35. Achieved by tightening. Therefore, there is no need to bolt each switching element directly to the compressor housing as in the case of employing the configuration of Patent Document 1. After the motor drive circuit 41 is assembled, a procedure of mounting the circuit 41 on the compressor housing 11 can be adopted. Therefore, it is possible to avoid various troubles caused by assembling the inverter on the compressor housing as in the case of employing the configuration of Patent Document 1. Accordingly, the electric compressor 10 can be provided at a low cost by providing the above-described configuration for improving the heat radiation of the switching element 44A.
[0038]
(2) Between the first housing component 21 and the switching element 44A of the motor drive circuit 41, a sheet 45 having elasticity, insulation and excellent thermal conductivity is interposed. An elastic sheet 46 is interposed between the cover member 38 and the motor drive circuit 41. Therefore, for example, even if the height of each switching element 44A on the substrate 43 varies due to the dimensional tolerance, the absolute height of each switching element 44A is increased by the elastic deformation of the sheets 45 and 46. The variation in height and the variation in relative height between the switching elements 44A are absorbed. Therefore, each switching element 44 </ b> A can be securely brought into close contact with the first housing component 21. This leads to an improvement in the heat dissipation of the switching element 44A and a stable arrangement of the motor drive circuit 41 in the accommodation space 35.
[0039]
Further, in the present embodiment, the two sheets 45 and 46 are configured to share and absorb variations in height of the switching elements 44A on the substrate 43. Therefore, the maximum amount of elastic deformation required for each of the sheets 45 and 46 may be small, and the sheets 45 and 46 may be thin. In particular, the fact that the sheet 45 interposed between the first housing component 21 and the switching element 44A can be made thinner leads to an improvement in thermal conductivity between the first housing component 21 and the switching element 44A. . Therefore, the heat dissipation of the switching element 44A can be further improved.
[0040]
Further, the motor drive circuit 41 sandwiched between the elastic sheets 45 and 46 has excellent vibration resistance.
(3) Between the cover member 38 and the board 43 of the motor drive circuit 41, a board support member 47 for backing up the vicinity of the switching element 44A of the board 43 is interposed. Accordingly, it is possible to prevent the substrate 43 from bending near the element 44A due to the pressing of each switching element 44A against the first housing component 21. Therefore, it is possible to prevent breakage of the substrate 43 due to the bending of the substrate 43, peeling of the soldered portion of the switching element 44A on the substrate 43, and the like.
[0041]
○ 2nd embodiment
4A and 4B show a second embodiment. The present embodiment is different from the first embodiment in that a resin spacer 51 is interposed at the same position as the sheet 46 instead of the sheet 46. By adjusting the thickness X1 of the spacer 51, the pressing force of the switching element 44A against the first housing component 21 (bottom surface 35a) is considered to be favorable in addition to the elastic deformation of the sheet 45.
[0042]
That is, as described in the effect (2) of the first embodiment, the use of only one elastic sheet 45 reliably absorbs the absolute and relative height variations of the switching elements 44A. If this is attempted, the sheet 45 becomes thicker, and the heat dissipation of the switching element 44A deteriorates.
[0043]
Therefore, in the present embodiment, first, the thickness X2 near the switching element 44A of the motor drive circuit 41 is measured. The thickness X2 in the vicinity of the switching element 44A of the motor drive circuit 41 refers to the tip end face (upper surface in the figure) of the substrate support member 47 and the tip end face (radiation surface 44A- 1). Then, a spacer 51 having a thickness X1 corresponding to a difference between the measured value X2 and a preset preferable value X3 is selected from a plurality of types of prepared spacers 51 in advance, and the spacer 51 is used as a motor. It is interposed between the drive circuit 41 (the substrate support member 47) and the lid member 38 (the top surface 35b of the housing space 35).
[0044]
Note that the selection of the thickness X1 of the spacer 51 does not necessarily have to satisfy “X3−X2 = X1”, and there may be a slight error if the value is close to “X3−X2 = X1”. That is, even if the spacer 51 having the thickness X1 that does not satisfy the above expression is selected, the error can be absorbed to some extent by the elastic deformation of the sheet 45.
[0045]
○ Third embodiment
FIG. 5 shows a third embodiment. In the present embodiment, the sheet 46 is deleted from the configuration of the first embodiment. Then, the adjustment of the thickness X2 (see FIG. 4B) near the switching element 44A of the motor drive circuit 41 to the preferable value X3 (see FIG. 4A) is performed by adjusting the thickness of the substrate support member 47. I have to.
[0046]
The adjustment of the thickness of the substrate support member 47 described above may be performed by selecting from a plurality of types of prepared substrate support members 47 in advance, similarly to the spacer 51 of the second embodiment. . Alternatively, the substrate support member 47 is directly formed by laying a resin on the substrate 43 and pressing the motor drive circuit 41 toward the lid member 38 in a state where the resin is soft (the thickness can be changed). The thickness of the substrate support member 47 may be adjusted.
[0047]
○ Fourth embodiment
FIG. 6 shows a fourth embodiment. In the present embodiment, the sheet 46 is deleted from the first embodiment. In the motor drive circuit 41, a structure is employed in which the switching element 44A (main body) is arranged so as to float from the substrate 43 (surface 43a).
[0048]
In the motor drive circuit 41, between the surface 43a of the substrate 43 and each switching element 44A, a resin-made and plate-shaped element support member 55 for backing up the switching element 44A on the substrate 43 is interposed. Have been. Therefore, the load acting on the switching element 44 </ b> A due to the pressing against the first housing component 21 is favorably received by the substrate 43 via the element support member 55. Therefore, even with the adoption of the structure in which the switching element 44A (main body) is floated from the substrate 43, the stress caused by the load is concentrated on the soldered portion of the switching element 44A (mounting foot) on the substrate 43. Can be prevented, and the soldered portion can be prevented from being damaged.
[0049]
In the present embodiment, the thickness of the element support member 55, that is, the height of each switching element 44A on the substrate 43 (the degree of floating of the main body) is adjusted, so that the switching element 44A with respect to the first housing structure 21 is adjusted. The pressing force is adjusted. Therefore, the variation in absolute and relative height of each switching element 44A can be almost completely eliminated, and it can be prevented that the pressing force of each switching element 44A against the bottom surface 35a of the accommodation space 35 varies. This leads to an improvement in the heat radiation of each switching element 44A and a stable arrangement of the motor drive circuit 41 in the accommodation space 35.
[0050]
Further, as described above, using the element support member 55 as the pressing force adjusting means of the switching element 44A has an advantage that the configuration of the electric compressor 10 can be simplified.
[0051]
The present invention can be implemented in the following modes without departing from the spirit of the present invention.
In the above embodiments, the sheet 45 is deleted. That is, the heat radiation surface 44A-1 of the switching element 44A is brought into direct contact with the first housing component 21 (the bottom surface 35a of the housing space 35).
[0052]
In the above embodiments, the motor drive circuit 41 is fixed in the accommodation space 35 only by tightening the motor drive circuit 41 between the first housing component 21 and the cover member 38. This is changed, and the motor drive circuit 41 is fixed in the accommodation space 35 using bolting in addition to the above-described tightening. In this case, the motor drive circuit 41 may be bolted to the first housing component 21 or may be bolted to the lid member 38.
[0053]
In each of the above embodiments, the electric compressor 10 is embodied as a so-called full electric compressor in which the drive source of the compression mechanism 14 is only the electric motor 12. This is changed, and the electric compressor is embodied as, for example, a so-called hybrid compressor in which an engine serving as a driving source of a vehicle is used as another driving source.
[0054]
The compression mechanism 14 is not limited to the scroll type, and may be, for example, a piston type, a vane type, a helical type, or the like.
When describing the technical idea that can be grasped from the above embodiment, an elastic member is interposed both between the compressor housing and the switching element of the motor drive circuit and between the circuit cover and the motor drive circuit. 3. The electric compressor according to 2.
[0055]
【The invention's effect】
According to the present invention having the above-described configuration, it is possible to achieve good heat radiation of the switching element by using an inexpensive configuration.
[Brief description of the drawings]
FIG. 1 is a vertical sectional view of an electric compressor.
FIG. 2 is a side view of the electric compressor.
FIG. 3 is a cross-sectional view taken along line 1-1 of FIG. 2, showing a state where a rotary shaft and an electric motor are removed.
4A is a cross-sectional view of an electric compressor according to a second embodiment, and FIG. 4B is an exploded view of the electric compressor.
FIG. 5 is a cross-sectional view of an electric compressor according to a third embodiment.
FIG. 6 is a cross-sectional view of an electric compressor according to a fourth embodiment.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Electric compressor, 11 ... Compressor housing, 12 ... Electric motor, 14 ... Compression mechanism, 21 ... First housing structure which comprises a compressor housing, 22 ... Similar second housing structure, 35 ... Accommodation space, 38 ... Circuit Lid member as cover, 41: motor drive circuit, 43: substrate, 43a: surface opposite to lid member (top surface 35b), 44A: switching element, 45: sheet as elastic member, 46: as elastic member No. 47, a substrate support member, and 55, an element support member.

Claims (6)

  1. In an electric compressor in which a compression mechanism is housed in a compressor housing and the compression mechanism is driven by an electric motor to perform gas compression,
    A circuit cover is joined and fixed to the outside of the compressor housing, and a motor drive circuit for driving an electric motor is accommodated in an accommodation space surrounded by the compressor housing and the circuit cover, and the motor drive circuit includes: The switching element is mounted on the surface of the substrate opposite to the circuit cover, and the switching element is tightened by the motor drive circuit between the two in the housing space due to the joining and fixing of the circuit cover to the compressor housing. An electric compressor, which is pressed against a compressor housing.
  2. The electric compressor according to claim 1, wherein an elastic member is interposed between at least one of the compressor housing and the switching element of the motor drive circuit and between at least one of the circuit cover and the motor drive circuit.
  3. 3. The electric compressor according to claim 1, wherein a board support member that supports the vicinity of the switching element on the board is provided between the circuit cover and the board of the motor drive circuit. 4.
  4. The electric compressor according to claim 3, wherein a pressing force of the switching element against the compressor housing is adjusted by adjusting a thickness of the board support member between the circuit cover and the board.
  5. The electric compressor according to any one of claims 1 to 4, wherein an element support member that supports the switching element on the substrate as a backup is interposed between the substrate and the switching element in the motor drive circuit.
  6. The electric compressor according to claim 5, wherein the pressing force of the switching element against the compressor housing is adjusted by adjusting the thickness of the element support member between the substrate and the switching element.
JP2003035654A 2002-07-15 2003-02-13 Electric compressor Pending JP2004100683A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2002205272 2002-07-15
JP2003035654A JP2004100683A (en) 2002-07-15 2003-02-13 Electric compressor

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US20040013544A1 (en) 2004-01-22

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