JP2003013859A - Motor drive circuit-integrated electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control vibration of a motor drive circuit-integrated electric compressor while improving properties for loading on a vehicle of the same. SOLUTION: A whole shape of an integrated casing 140 is formed into a roughly cylindrical shape by arranging a third casing part 130 housing a drive circuit IC on the axial direction one end side of the integrated casing 140. Consequently, the center of gravity of the motor drive circuit-integrated electric compressor 100 can be positioned in adjacent of a shaft 121 to reduce vibration and noise of the motor drive circuit-integrated electric compressor 100 while improving properties for loading the same on the vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor drive circuit integrated electric compression device in which a compression mechanism for sucking and compressing a fluid, an electric motor for driving the compression mechanism, and a motor drive circuit for driving the motor are integrated. It is effective when applied to a compressor for a vapor compressor type refrigerator.

[0002]

BACKGROUND OF THE INVENTION The applicant has already filed Japanese Patent Application No. 2000-370073 as an electric compression device integrated with a motor drive circuit, but in this application, the motor drive circuit portion is Since it is located above the main casing that houses the compression mechanism and the motor, the external shape of the motor drive circuit integrated electric compressor is that the drive circuit portion has a diameter on the outer peripheral surface of the substantially cylindrical main casing. There is a problem in that it has a distorted shape that protrudes in the direction, and its mountability on a vehicle is low.

Further, in the invention described in the above-mentioned application, since the drive circuit portion has a distorted shape that protrudes in the radial direction, the position of the center of gravity of the motor drive circuit integrated electric compressor is largely displaced from the shaft. When mounted in a vehicle so that the longitudinal direction of the shaft matches the horizontal direction, the position of the center of gravity becomes higher than that of the shaft, and the motor drive circuit integrated electric compression device easily vibrates and noise
Vibration is more likely to occur.

In view of the above points, the present invention improves the mountability of a motor drive circuit integrated electric compression device in a vehicle,
An object of the present invention is to suppress vibration of a motor drive circuit integrated electric compressor.

[0005]

In order to achieve the above object, the present invention provides a compression mechanism (Cp) for sucking and compressing a fluid, and an electric motor for driving the compression mechanism (Cp). Motor (Mo) and a motor drive circuit (Ic) for driving the motor (Mo) are integrated into a motor drive circuit type electric compression device, and a first casing part for housing a compression mechanism (Cp). (110), motor (Mo)
And a third casing part (130) for accommodating the motor drive circuit (Ic).
Has a substantially cylindrical integrated casing (140) integrated with each other, and the third casing portion (130) includes one end side in the axial direction of the integrated casing (140) and the integrated casing (14).
0) is provided on at least one of the outer peripheral side.

As a result, the center of gravity of the motor-drive-circuit integrated electric compressor can be located near the shaft of the motor (Mo), so that the motor-drive-circuit integrated electric compressor can be mounted on a vehicle. While improving, it is possible to suppress large vibration of the motor-drive-circuit integrated electric compression device 100. As a result, it is possible to reduce vibration and noise of the motor drive circuit-integrated electric compression device.

The third casing portion (130) is the same as the invention according to claim 2, and the first casing portion (11)
0) may be provided adjacent to the third casing part (1
When 30) is provided adjacent to the first casing part (110), as in the invention according to claim 3, between the third casing part (130) and the first casing part (110), It is desirable to protect the motor drive circuit (Ic) from heat generated during the operation of the compression mechanism (Cp) by providing the heat insulating portion (133) that suppresses heat transfer.

When the compression mechanism (Cp) is a scroll type compression mechanism as in the fourth aspect of the invention, at least a portion corresponding to the substantially central portion (112a) of the scroll member (112) is provided. By providing the heat insulating portion (133), the motor drive circuit (Ic) can be effectively protected from the heat generated when the compression mechanism (Cp) operates.

Incidentally, the reference numerals in the parentheses of the above-mentioned means are examples showing the correspondence with the concrete means described in the embodiments described later.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment) FIG. 1 is a vapor compression refrigeration cycle for a vehicle using a motor drive circuit integrated electric compression device (hereinafter referred to as a compression device) 100 according to the present embodiment. It is a schematic diagram of the refrigeration cycle (vapor compression refrigerator) of (vehicle air conditioner).

Reference numeral 200 denotes a radiator (condenser) for cooling the refrigerant (fluid) discharged from the compression device 100,
300 is a receiver (gas-liquid separator) that separates the refrigerant flowing out from the radiator 200 into a gas-phase refrigerant and a liquid-phase refrigerant, flows out the liquid-phase refrigerant, and stores excess refrigerant in the refrigeration cycle.
Is.

Reference numeral 400 is a decompressor (capillary tube in this embodiment) such as a fixed throttle or a capillary tube having a fixed valve opening for decompressing the liquid-phase refrigerant flowing out from the receiver 300, and 500 is a capillary tube 400. It is an evaporator that evaporates the refrigerant whose pressure has been reduced. In the present embodiment, the capillary tube 400 constitutes the pressure reducer, but the present embodiment is not limited to this, and a variable throttle such as a temperature type expansion valve may be adopted as the pressure reducer. .

Next, the structure of the compression device 100 will be described.

FIG. 2 is a schematic diagram of the compression device 100. In FIG. 2, reference numeral 110 denotes an aluminum compression mechanism casing portion (hereinafter, referred to as a first compression housing) that houses a scroll type compression mechanism Cp for sucking and compressing a refrigerant (fluid). Reference numeral 120 denotes a casing portion, and 120 is an aluminum motor casing (hereinafter referred to as a second casing portion) that houses an electric DC brushless motor (hereinafter, abbreviated as a motor) Mo that drives the compression mechanism Cp. ).

Here, the scroll type compression mechanism Cp is a fixed scroll 111 in which spiral teeth are formed.
And the orbiting scroll 112 and the like. By orbiting the orbiting scroll 112 with respect to the fixed scroll 111, the volume of the working chamber V is enlarged or reduced to suck and compress the refrigerant.

In this embodiment, the crankshaft 113 that orbits the orbiting scroll 112 is supported, and the compression mechanism Cp (orbiting scroll 112) side and the motor chamber (the third casing in which the rotor and the stator of the motor Mo are housed) are accommodated. The partition wall 114 for partitioning the (internal space 120) 120a and the fixed scroll 111 constitute the first casing portion 110.

The fixed scroll 111 has an evaporator 5 attached thereto.
00 is provided with a suction port 111a connected to the refrigerant outlet side, while the orbiting scroll 112 is provided with a discharge port 112a for discharging the compressed refrigerant in a substantially central portion thereof. In the present embodiment, the crankshaft 113 and the shaft 121 of the rotor (motor Mo) are integrated and the crankshaft 113
The (shaft 121) is formed with a first communication passage 122 that connects the discharge port 112a and the motor chamber 120a.

The compression mechanism Cp side of the shaft 121 is a radial bearing 123 press-fitted and fixed to the partition wall 114.
Is rotatably supported, and the opposite side is rotatably supported by a radial bearing 124 press-fitted and fixed to the second casing 120.

Incidentally, the orbiting scroll 112 is connected to the crankshaft 113 via a shell type radial bearing 112b and a bushing 112c. In the present embodiment, the bushing 112c is connected to the crankshaft 11 by the shell.
By making it slightly displaceable with respect to 3, the orbiting scroll 112 is slightly displaced by utilizing the compression reaction force acting on the orbiting scroll 112 in the direction in which the contact pressure of the tooth portions of both scrolls 111, 112 increases. It constitutes the crank mechanism.

Reference numeral 130 denotes an aluminum inverter casing (hereinafter, referred to as a third casing portion) that houses a motor drive circuit (hereinafter, abbreviated as a drive circuit) Ic for driving a motor Mo including an inverter element and the like. And the third casing portion 130 and the first casing portion 1
The 10 and the second casing part 120 are integrated by fastening means such as bolts. Hereinafter, the one in which the three casing portions 110, 120, and 130 are integrated is referred to as an integral casing 140.

In the present embodiment, the third casing portion 110 is located at one end side in the axial direction of the integrated casing 140, in order from the one end side in the axial direction (left side in the drawing).
Along with the casing portion 130, the first casing 110, and the second casing portion 120, the integral casing 140 is configured so that the overall shape thereof is a substantially cylindrical shape.

The third casing portion 130 has a substantially cup-shaped cylindrical portion 131 which is fixed in contact with and fixed to the second casing portion 110 (fixed scroll 111).
The cover 132 is configured to close the opening of the tubular portion 131 (the side of the tubular portion 131 opposite to the first casing portion 110).

Then, of the bottom portion of the tubular portion 131 (the portion facing the first casing portion 110 (fixed scroll 111)), at least the portion corresponding to the discharge port 112a, from the compression mechanism Cp side to the drive circuit Ic side ( A heat insulating space (heat insulating portion) 133 for insulating heat from moving to the third casing portion 130 side is provided.

Numeral 125 is a rod-shaped power supply terminal for supplying a drive current to the motor Mo.
Is a high seal such as glass and the like, which penetrates through the first and second casing parts 110 and 120 and reaches between the third and third casings 130, and which has both electric insulation properties such as rubber and waterproof sealability and glass. Sealed by the second seal 127 having electrical insulation and pressure-proof sealing property Next, the schematic operation of the compression device 100 according to the present embodiment will be described with reference to FIG.

When the motor Mo rotates and the compression mechanism Cp operates, the refrigerant flowing out from the evaporator 500 is sucked into the compression mechanism Cp from the suction port 111a, and the discharge port 1
It is discharged from 12a and flows into the motor chamber 120a via the first communication passage 122.

Then, the refrigerant that has flowed into the motor chamber 120a cools the components of the motor Mo such as the rotor and the stator, and then passes through the second communication passage 128 formed on the radial bearing 124 side of the shaft 121. Outlet 129
It is discharged to the radiator 200 side (outside the compression device 100).

Next, the features (effects) of this embodiment will be described.

According to this embodiment, the third casing portion 1
By disposing 30 on one axial side of the integrated casing 140, the overall shape of the integrated casing 140 is substantially cylindrical, so that the center of gravity of the compression device 100 can be located near the shaft 121. Therefore,
While improving the mountability of the compression device 100 on a vehicle, it is possible to prevent the compression device 100 from vibrating significantly and reduce the vibration and noise of the compression device 100.

Further, since the heat insulating space 133 is provided between the third casing portion 130 and the first casing 110, the drive circuit Ic is protected from the heat generated during the operation of the compression mechanism Cp (when the refrigerant is compressed). Can drive circuit I
The reliability (durability) of c can be improved.

By the way, in the scroll type compression mechanism Cp, the volume of the working chamber V decreases as it approaches the discharge port 112a.
The temperature becomes higher as it gets closer to the central part 11). Therefore, as in the present embodiment, at least the discharge port 112
If the heat insulating space 133 is provided in the portion corresponding to a, the drive circuit Ic can be effectively protected from the heat generated when the compression mechanism Cp operates (when the refrigerant is compressed).

On the other hand, the compression mechanism Cp (first casing portion 1
In 10), since the suction chamber is formed outside the fixed scroll 111 (on the radially outer side of the discharge port 112a), the temperature of the outside of the fixed scroll 111 is lower than that of the central portion. Therefore, the lower the heat-resistant temperature of the electric devices forming the drive circuit Ic, the third casing portion 13
It is desirable to install it on the radially outer side of 0.

Therefore, if the electric equipment constituting the drive circuit Ic has a lower heat resistant temperature, the electric equipment can be cooled by the intake refrigerant having a lower temperature if the electric equipment is installed on the radially outer side of the third casing portion 130. Therefore, the reliability (durability) of the drive circuit Ic can be improved.

(Second Embodiment) In the first embodiment, the third embodiment
Although all of the casing 130 (the space in which the drive circuit Ic is housed) is configured on one end side in the axial direction of the integrated casing 140, in the present embodiment, as shown in FIG. 3, the outer peripheral side of the integrated casing 140 ( The third casing 130 (the space where the drive circuit Ic is housed) is also configured on the outer diameter side of the compression mechanism Cp).

As a result, the electric equipment of the drive circuit Ic having a low heat-resistant temperature or a large amount of heat generation corresponds to the radially outer side of the third casing part 130 (the outer peripheral side of the integral casing 140). If it is installed in a portion where the drive circuit Ic is installed, it is possible to cool the electric device with the intake refrigerant having a low temperature, so that the reliability (durability) of the drive circuit Ic can be improved.

In FIG. 3, drive circuits Ic-A and Ic-
B and Ic-C are electric devices having a high heat resistance temperature or a large heat generation amount in the order of Ic-A, Ic-B, and Ic-C.
The drive circuit Ic-A is connected to the third casing 130 (drive circuit I
It is installed on the outermost diameter side of the space (where c is stored).

(Other Embodiments) In the above-described embodiment, the heat insulating space 133 is a simple void, but the present invention is not limited to this, and the thermal conductivity of resin, foam material, etc. is low. The heat insulating section may be configured by disposing something between the third casing 130 and the first casing 110 or the like.

The drive circuit Ic is not limited to the inverter circuit, and may be another drive circuit.

The motor Mo is not limited to the DC brushless motor, and may be another type of motor.

[Brief description of drawings]

FIG. 1 is a schematic diagram of a vapor compressor refrigerator according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the motor drive circuit integrated electric compression device according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view of a motor drive circuit integrated electric compression device according to a second embodiment of the present invention.

[Explanation of symbols]

100 ... Electric drive device integrated with motor drive circuit, 110 ...
1st casing part, 120 ... 2nd casing part, 130
... third casing part, 140 ... integrated casing, Cp ...
Compression mechanism, Mo ... Electric motor, Ic ... Motor drive circuit.

Continued front page    F term (reference) 3H003 AA05 AB05 AC03 BA00 BB00                       BF05 CD01 CF04                 3H029 AA02 AA15 AB03 BB12 BB21                       CC07 CC09 CC27 CC48                 3H039 AA02 AA12 BB02 BB13 CC32                       CC33 CC34 CC47

Claims (4)

[Claims] 1. A compression mechanism (Cp) for sucking and compressing a fluid,
An electric motor (M for driving the compression mechanism (Cp)
o) and a motor drive circuit (Ic) for driving the motor (Mo), which is integrated with a motor drive circuit, and is a first casing part (1) for housing the compression mechanism (Cp).
10), a second casing part (120) for accommodating the motor (Mo), and a third casing part (130) for accommodating the motor drive circuit (Ic). ), The third casing portion (130) is provided on at least one of an axial direction one end side of the integrated casing (140) and an outer peripheral portion side of the integrated casing (140). Motor drive circuit integrated electric compressor. 2. The fluid discharged from the compression mechanism (Cp) is discharged to the outside after cooling the motor (Mo), and the third casing portion (130) is connected to the first casing portion (130).
The motor drive circuit integrated electric compressor according to claim 1, wherein the electric compressor is provided adjacent to the casing (110). 3. A heat insulating part (133) for suppressing heat transfer is provided between the third casing part (130) and the first casing part (110). Item 2. A motor drive circuit integrated type electric compressor according to Item 2. 4. The compression mechanism (Cp) is a scroll-type compression mechanism that sucks and compresses fluid by relatively orbiting a pair of scroll members (111, 112) having spiral teeth. The motor drive circuit integrated type according to claim 3, wherein the heat insulating portion (133) is provided at least at a portion corresponding to a substantially central portion (112a) of the scroll member (112). Electric compression device.