KR101379571B1 - Electronic compressor - Google Patents

Abstract

The present invention relates to an electric compressor. According to the present invention, the appearance and skeleton of the compressor 1 are formed by the front and rear housings 10 and 10 'and the frame 13. The inverter chamber 29, the motor chamber 25, and the compression chamber 15 are all connected to the front and rear housings 10 and 10 ′ and the frame 13. A partition plate 30 is formed at a position spaced apart from the inner wall surface of the inverter chamber 29 by a fastener B below a suction port 29 ′ through which refrigerant is introduced from the inverter chamber 29. do. An inverter 32 is provided on a surface of the partition plate 30 facing the inner wall surface of the inverter chamber.

According to the present invention having such a configuration, a part of the refrigerant introduced into the inverter chamber 29 directly cools the inverter 32, and the remaining refrigerant flows into the motor chamber 25 to allow the motor chamber 26. Since cooling the motor 27 of), the inverter 32 can be cooled independently, and the cooling efficiency is increased by cooling the motor 27 with a relatively low temperature refrigerant.

Electric compressors, partition plates, inverters, refrigerants

Description

Electronic compressor {Electronic compressor}

The present invention relates to a compressor, and more particularly, to an electric compressor for compressing a refrigerant using a motor as a drive source.

In general, a compressor used in an air conditioning system of a vehicle sucks a refrigerant evaporated from an evaporator and transfers the refrigerant to a condenser made at a high temperature and high pressure, which are easy to liquefy.

In such a compressor, there is a reciprocating type in which compression is performed while reciprocating motion is actually performed for compressing the refrigerant, and a rotary type in which compression is performed while rotating. Rotary compressors include a mechanical type that performs rotation using the engine as a driving source, and an electric type that uses a motor as the driving source.

Electric compressors are driven by a separate motor. The motor speed is controlled by the inverter of the electric compressor. Since the electric compressor uses a separate motor, the compressor needs to be cooled. In general, the cooling of the electric compressor was performed in such a way that the refrigerant used for compression flows to the part where the motor of the compressor is installed to absorb heat.

Inverters included in the electric compressor also require separate cooling during operation of the compressor. Inverters use a number of heating elements that generate heat during operation. Since these heating elements are weak in durability, it is difficult to perform cooling by allowing the refrigerant to flow directly.

Therefore, an attempt has been made to install an inverter on the suction side wall of the compressor to transfer heat to the suction side wall and to perform cooling in such a manner that the refrigerant cools the suction side wall. : An electric compressor, hereinafter referred to as an electric compressor).

According to the electric compressor according to the prior art, the appearance of the compressor is formed by an intermediate housing in which a motor is installed and a discharge housing and a suction housing respectively provided on both sides of the intermediate housing, and the intermediate housing, the discharge housing and the suction housing are The interior is all in communication. A suction port is formed in the suction housing, and a driving circuit (corresponding to the inverter) for controlling the driving of the motor is installed on one side wall of the suction housing. The drive circuit is installed on the side opposite to the surface where the refrigerant flows in the suction housing so as not to directly contact the refrigerant. A motor for transmitting a driving force for compression is installed in the intermediate housing, and the discharge housing is provided with a fixed scroll and a movable scroll for compressing the refrigerant.

Looking at the flow of the refrigerant inside the electric compressor, the refrigerant is first introduced through the suction port of the suction housing. The introduced refrigerant absorbs the heat transferred to the wall of the suction housing among the heat generated from the driving circuit while passing through the suction housing. The refrigerant absorbing heat from the driving circuit cools the motor installed in the intermediate housing while passing through the intermediate housing. The refrigerant having cooled the motor flows back into the discharge housing, is compressed by the fixed scroll and the movable scroll of the discharge housing and discharged to the outside.

However, the electric compressor according to the prior art having such a configuration has the following problems.

According to the prior art, since the refrigerant absorbs only the heat transferred to the suction side wall of the heat generated from the driving circuit, the heat emitted from the entire driving circuit cannot be absorbed, resulting in poor cooling efficiency of the driving circuit. .

In addition, since a relatively high temperature refrigerant absorbing heat from the driving circuit flows into the motor chamber to cool the motor, there is a problem in that the cooling efficiency of the motor with high heat generation is low.

An object of the present invention is to solve the problems of the prior art as described above, it is to provide an electric compressor for branching the refrigerant introduced into the inverter chamber, part of the cooling of the inverter, and part of the cooling of the motor.

It is yet another object of the present invention to provide an electric compressor that independently cools the inverter by allowing the refrigerant to flow directly around the inverter and absorb heat.

According to a feature of the present invention for achieving the object as described above, the present invention provides a housing and the skeleton of the electric compressor, the compression chamber, the motor chamber and the inverter chamber is formed to communicate with; A compression mechanism provided in the compression chamber to compress the introduced refrigerant; A motor installed in the motor chamber and connected to the compression mechanism to provide a driving force for compressing the refrigerant; And an inverter for controlling the rotation of the motor, and a partition plate is installed in the inverter chamber so that the inverter chamber is partitioned into an inflow portion through which refrigerant flows into the motor chamber and a cooling portion for cooling the inverter. The inverter is installed in the unit.

The partition plate further includes a communication path through which the coolant flows into the cooling part and a discharge path through which the coolant of the cooling part is discharged to the inlet part.

A protective layer is provided on a surface of the partition plate on which the inverter is installed so that the inverter is shielded by the protective layer.

The communication path is formed at a portion adjacent to the suction port through which the refrigerant flows into the housing from the partition plate.

According to the present invention, a portion of the refrigerant introduced into the suction port is introduced between the partition plate and the inner wall of the housing to directly cool the inverter, thereby cooling the inverter more efficiently.

In addition, a portion of the refrigerant introduced into the inverter chamber can be directly introduced into the motor chamber to cool the components located in the motor chamber, thereby cooling the components in the motor chamber with a relatively low temperature refrigerant, thereby increasing the cooling efficiency of the compressor.

Hereinafter, the configuration of a preferred embodiment of the electric compressor according to the present invention will be described in detail with reference to the drawings.

1 is a cross-sectional view showing an internal configuration of a preferred embodiment of the electric compressor according to the present invention, Figure 2 is a perspective view of the inverter installed in the partition plate constituting the embodiment of the present invention, Figure 3 A cross-sectional view of line A-A 'of 1 is shown.

According to these drawings, the appearance and skeleton of the compressor 1 are formed by a frame 13 connecting the front and rear housings 10 and 10 'and the front and rear housings 10 and 10'. The front and rear housings 10 and 10 'are coupled together and fixed with the frame 13 interposed therebetween. The frame 13 serves to partition the compression chamber 15 and the motor chamber 25 which will be described later.

The compression chamber 15 is formed inside the rear housing 10 ′. The compression chamber 15 is a portion where the refrigerant is compressed into a predetermined space formed by the rear housing 10 'and the frame 13.

The compression chamber 15 is provided with a compression mechanism 16 for compressing the refrigerant. The compression mechanism 16 compresses the refrigerant using the rotational force transmitted from the motor 23 to be described later. Such a compression mechanism 16 may be a crank type, swash plate type wobble plate type, scroll type, etc. according to the compression method. In the present embodiment, a compression mechanism for performing scroll compression will be described as an example.

Compression of the scroll compressor is performed by the fixed scroll 17 and the turning scroll 19 which rotates relative to the fixed scroll 17.

The fixed scroll 17 is fixed to one side of the compression chamber 15. The fixed scroll 17 is composed of a disk-shaped fixed plate 17a forming a skeleton and a fixed spiral portion 17b formed to protrude a predetermined amount in an involute shape on one side of the fixed plate 17a. The fixed scroll 17 serves to compress the refrigerant together with the turning scroll 19 to be described later.

The fixed scroll 17 cooperates with the turning scroll 19 to compress the refrigerant. The turning scroll 19 is connected to the rotor 27b installed in the center of the frame 13 and rotates together. The refrigerant is compressed by the turning scroll 19 to rotate relative to the fixed scroll 17. The orbiting scroll 19 is a orbital spiral plate 19b which is formed to protrude in an involute form on the surface of the orbiting plate-shaped pivoting plate 19a and the pivoting plate 19a that faces the fixed scroll 17. It is composed of A compression space 21 is formed by the fixed spiral portion 17b of the fixed scroll 17 and the swing spiral portion 19b of the revolving scroll 19, and the refrigerant is compressed in the compressed space 21.

The discharge port 23 penetrates through the rear housing 10 '. The discharge port 23 serves as a passage through which the refrigerant compressed by the turning scroll 19 and the fixed scroll 17 is discharged.

The space formed in cooperation with the frame 13 in the front housing 10 is the motor chamber 25. The motor chamber 25 is a portion where the motor 27, which is a driving source of the compressor 1, is installed. The motor 27 is largely composed of a stator 27a and a rotor 27b.

The stator 27a is formed by stacking a plurality of core pieces having a thin plate shape in a cylindrical shape through which the center thereof is substantially penetrated. A coil is wound around the stator 27a. When a current flows through the coil wound around the stator 27a, a magnetic field is formed in the stator 27a.

The rotor 27b is inserted and positioned at the center of the stator 27a. The rotor 27b is formed by stacking a plurality of core pieces in a substantially cylindrical shape. When a current flows through the coil of the stator 27a, a magnetic field is generated, and the rotor 27b rotates.

An inverter chamber 29 is formed in the front housing 10. More precisely, the inverter chamber 29 is formed between the motor chamber 25 and the front housing 10. The inverter chamber 29 is a space in which an inverter 32 for controlling the rotation of the compressor 1 is installed. One side of the inverter chamber 29 is formed through the suction port 29 ′. The inverter chamber 29 communicates with the motor chamber 25 and the refrigerant introduced into the suction port 29 ′ is transferred to the compression chamber 15 through the motor chamber 25.

A partition plate 30 is installed below the portion where the suction port 29 ′ is formed in the inverter chamber 29. The partition plate 30 is formed in a disc shape corresponding to the cross section of the inner surface of the inverter chamber 29, thereby partitioning the inverter chamber 29 into two spaces. For convenience, the portion communicating with the motor chamber 25 in the inverter chamber 29 will be referred to as the inflow portion 29a and the opposite portion will be referred to as the cooling portion 29b. The refrigerant introduced into the inlet 29a directly flows into the motor chamber 25, and the refrigerant introduced into the cooling unit 29b cools the inverter 32 and then flows back into the inlet 29a. It flows into the motor chamber 25.

Cutouts 30a are formed in portions of the partition plate 30 facing the suction port 29 'and corresponding portions thereof. The cutout 30a forms a predetermined space between the inner surface of the inverter chamber 29 so that refrigerant may flow into the inflow portion 29a.

A portion of the space formed between the cutout 30a and the inner surface of the inverter chamber 29 at the suction port 29 'is a communication path H through which refrigerant flows into the cooling unit 29b. And the other part is a discharge path H 'which allows a refrigerant to be discharged from the cooling unit 29b. The refrigerant is introduced through the communication path (H) and is discharged to the inlet (29a) through the discharge path (H '). In this embodiment, although the communication path H and the discharge path H 'are formed between the cutout 30a and the inner surface of the inverter chamber 29, the communication path H and the discharge path ( It is also possible to process H ') to penetrate the partition plate 30 directly.

A fastening hole 30b is formed through the partition plate 30. The fastening hole 30b is a portion through which the fastener B to be described later is installed.

The partition plate 30 is fixed by the fastener (B). The fastener B is fastened to the inner wall surface of the inverter chamber 29 by passing through the fastening hole 30b. The partition plate 30 is spaced apart from the inner wall of the inverter chamber 29 by a predetermined distance, and the cooling unit 29b is formed between the partition plate 30 and the inner wall of the inverter chamber 29. .

An inverter 32 is installed on the surface of the partition plate 30 that faces the cooling unit 29b. The inverter 32 is electrically connected to the motor 27 to control the rotation speed of the motor 27. By controlling the rotation speed of the motor 27, the amount of compression of the refrigerant is controlled to keep the interior of the vehicle constant at a desired temperature.

The inverter 32 installed in the partition plate 30 is shielded by the protective layer 34. The protective layer 34 serves to prevent the inverter 32 from being damaged by the refrigerant. In this embodiment, the protective layer 34 covers the surface on which the inverter 32 is installed in the partition plate 30 with a plastic material such as silicon to shield the inverter 32, but uses a box-shaped cover. It is also possible to shield the inverter 32.

Hereinafter, the operation of the inverter cooling structure of the electric compressor according to the present invention will be described in detail with reference to the drawings.

First, the refrigerant flows into the inverter chamber 29 through the suction port 29 '. The refrigerant introduced into the inverter chamber 29 is partially introduced into the inlet part 29a by the partition plate 30, and the other part is introduced into the cooling part 29b through the communication path H.

The refrigerant introduced into the inlet part 29a flows back into the motor chamber 25, and the refrigerant introduced into the cooling part 29b cools the inverter 32 installed in the partition plate 30, and then again. It is discharged to the motor chamber 25 through the discharge path (H). Since the inverter 32 is shielded by the protective layer 34, the inverter 32 is prevented from being damaged by the refrigerant.

Since the refrigerant flowing directly into the motor chamber 25 from the suction port 29 'is relatively low temperature, various components such as the stator 27a and the rotor 27b located in the motor chamber 25 are removed. Cooling can be effective. As time passes, the refrigerant having a relatively high temperature, which cools the inverter 32, flows into and moves from the inverter chamber 29 to the motor chamber 25 and cools the components of the motor chamber 25.

The refrigerant introduced into the motor chamber 25 is transferred to the compression chamber 15. The refrigerant introduced into the motor chamber 25 is evenly mixed with each other by the rotation of the rotor 27b, and the temperature thereof becomes a uniform state, and is then transferred to the compression chamber 15 again. The refrigerant introduced into the compression chamber 15 is compressed in the compression space 21 formed by the fixed scroll 17 and the turning scroll 19, and the compressed refrigerant is discharged through the discharge port 23.

In this manner, the inverter 32 can be independently cooled by the partition plate 30, and the motor chamber 25 is a refrigerant having a relatively low temperature that does not cool the inverter 32 in the motor chamber 25. Can cool the parts in the cylinder, thereby increasing the cooling efficiency of the compressor (1).

The scope of the present invention is not limited to the embodiments described above, but may be defined by the scope of the claims, and those skilled in the art may make various modifications and alterations within the scope of the claims It is self-evident.

The amount of the refrigerant for cooling the inverter 32 may be controlled by the size of the cutout 30a of the partition plate 30. Therefore, it is preferable to adjust the size of the cutout portion 30a to allow more refrigerant to flow into the motor chamber 25 that emits more heat than the inverter chamber 29.

1 is a cross-sectional view showing the internal configuration of a preferred embodiment of the electric compressor according to the present invention.

Figure 2 is a perspective view showing a state in which an inverter is installed in a partition plate constituting an embodiment of the present invention.

3 is a cross-sectional view taken along the line AA ′ of FIG. 1.

Description of the Related Art [0002]

 1: Compressor 10: Front Housing

10 ': rear housing 13: frame

15 compression chamber 16 compression mechanism

17: fixed scroll 17a: fixed plate

17b: fixed screw 19: turning scroll

19a: swivel plate 19b: swivel spiral

21: compression space 23: discharge port

25: motor room 27: motor

27a: stator 27b: rotor

29: inverter chamber 29 ': suction port

29a: inlet 29b: cooling section

30: partition plate 30a: cutout

30b: fastener 32: inverter

34: protective layer B: fastener

 H: communication path H ': discharge path

Claims (4)

Housings 10 and 10 'which form an appearance and a skeleton of the electric compressor, and in which the compression chamber 15, the motor chamber 25, and the inverter chamber 29 communicate with each other; A compression mechanism (16) provided in the compression chamber (15) for compressing the introduced refrigerant; A motor (27) installed in the motor chamber (25) and connected to the compression mechanism (16) to provide a driving force for compressing the refrigerant; The coolant inside the inlet section 29a flows into the cooling section 29b in the form of a plate partitioned into the inlet section 29a and the cooling section 29b through which the refrigerant moves to the motor chamber. A partition plate 30 in which a communication path H is formed and a discharge path H 'for discharging the refrigerant of the cooling unit 29b to the inlet part 29a is formed; And And an inverter (32) installed on one side of the partition plate (30) forming the cooling unit (29b) to control rotation of the motor (27). delete Housings 10 and 10 'which form an appearance and a skeleton of the electric compressor, and in which the compression chamber 15, the motor chamber 25, and the inverter chamber 29 communicate with each other; A compression mechanism (16) provided in the compression chamber (15) for compressing the introduced refrigerant; A motor (27) installed in the motor chamber (25) and connected to the compression mechanism (16) to provide a driving force for compressing the refrigerant; In the form of a plate, a partition plate 30 partitioning the refrigerant compartment into the inlet portion (29a) and the cooling portion (29b) is moved to the motor chamber in the inverter chamber (29); An inverter (32) installed on one side of a partition plate (30) forming the cooling unit (29b) to control rotation of the motor (27); And, And a protective layer (34) formed on the partition plate (30) provided with the inverter (32) to shield the inverter (32). The method of claim 1, wherein the communication path (H) is formed in a portion adjacent to the suction port (29 ') that the refrigerant flows into the interior of the housing (10, 10') from the partition plate 30 Electric compressor.

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