KR100941707B1 - Electrically driven compressor - Google Patents

Abstract

The present invention relates to an electric compressor, and more particularly, the external refrigerant is sucked into the inverter housing and then supplied to the swash plate chamber, and some of the refrigerant is used to cool the electric motor via the motor compartment. The present invention relates to an electric compressor that efficiently cools and prevents heat generation of the inverter, as well as a reduction in compression efficiency and improves the performance of the compressor.

In the present invention, the motor unit 10 is formed of a motor housing 11 having an electric motor 13 for rotating the drive shaft 14 in the motor chamber 12 therein, and on one side of the motor unit 10. In addition, the front and rear housings 30 and 60 having suction chambers 31 and 61 and discharge chambers 32 and 62, respectively, having at least one refrigerant outlet 64, And a cylinder block 40 installed between the rear housings 30 and 60 and having a plurality of bores 41a and 42a, and the drive shaft 14 in the swash plate chamber 43 in the cylinder block 40. In the electric compressor comprising a swash plate (50) which rotates together and a piston (20) reciprocating in the bore (41a) 42a in conjunction with the swash plate (50), the compression The unit 20 has a refrigerant intake port 81 to suck the external refrigerant to the swash plate chamber 43 and has an inverter housing 80 having a motor control means 82 therein. In addition, a plurality of low-pressure communication paths 34 and 41b communicating with the swash plate chamber 43 and the motor chamber 12 are formed, and the refrigerant in the motor chamber 12 is sucked into the front housing 30. A plurality of suction communication paths 35 are formed to be introduced into the seal 31.

Electric compressor, motor part, compression part, electric motor, inverter, cooling

Description

Electrically driven compressor

1 is a cross-sectional view showing an electric compressor according to the present invention;

2 is a cross-sectional view taken along the line A-A in FIG.

3 is a cross-sectional view taken along the line B-B in FIG. 1.

<Description of Signs of Major Parts of Drawings>

1: electric compressor 10: motor part

11: motor housing 12: motor compartment

13: electric motor 14: drive shaft

20: compression unit 30: front housing

31, 61: suction chamber 32, 62: discharge chamber

33,63: bulkhead 34,41b: low rolling path

35: suction passage 38: connection passage

40: cylinder block 41: front cylinder block

41a, 42a: Bore 42: Rear cylinder block

42b: suction flow path 43: slate chamber

50: swash plate 51: piston

52: shoe 53: thrust bearing                 

60: rear housing 64: refrigerant outlet

80: inverter housing 81: refrigerant inlet

82: motor control means 82a: inverter

83: refrigerant flow path

The present invention relates to an electric compressor, and more particularly, the external refrigerant is sucked into the inverter housing and then supplied to the swash plate chamber, and some of the refrigerant is used to cool the electric motor via the motor compartment. The present invention relates to an electric compressor that efficiently cools and prevents heat generation of the inverter, as well as a reduction in compression efficiency, and improves the performance of the compressor.

In general, a swash plate compressor, which is widely used as a compressor of an automobile air conditioner, has a disk-shaped swash plate installed to be inclined to a drive shaft selectively receiving engine power by an intermittent action of an electronic clutch or directly receiving electric power from an electric motor. By the rotation of the swash plate, and the plural pistons installed under the shoe along the circumference of the swash plate linearly reciprocate in a plurality of bores formed in the cylinder block, so that the refrigerant is sucked / compressed from the evaporator and discharged to the condenser. It is composed.

There are various types of such compressors. In general, the compressor is divided into reciprocating and rotary type according to the compression method and structure, and in the case of reciprocating type, there are crank type, swash plate type, wobble plate type, and in the case of rotary type, vane rotary type and scroll type are used. Some of these compressors also have a variable displacement type that can vary in volume.

In addition, there are also electric compressors driven by electric motors, such electric compressors are scroll type or swash plate type.

In this way, the electric compressor using the electric motor as a power source is composed of a motor unit including the electric motor and a compression unit for compressing the refrigerant, the motor portion is generated so that the heat generated by the rotation of the electric motor provided therein at high speed This causes a reduction in the overall performance of the electric compressor. Therefore, in the case of an electric compressor, it is an important subject to cool the said motor part.

As such, a number of technologies for cooling the motor of the electric compressor have been developed.

Japanese Patent Laid-Open No. 9-32729 includes a scroll compressor in which a suction refrigerant first passes through the motor chamber to cool the motor and then undergoes a compression action in the compression section. In this cooling method, since the entire sucked refrigerant flows into the compression unit via the motor unit, the refrigerant temperature and the pressure on the low pressure side are increased, thereby degrading the performance of the compressor due to the decrease in compression efficiency.

In addition, the suction refrigerant is guided to the motor unit to cool and recompressed through the low pressure side of the compressor, and by using the multi-stage compression method, the refrigerant compressed in the first piston is guided to the motor unit and cooled, and then recompressed at the second piston. And discharge methods are used. The above method is applied to a swash plate type compressor employing a migraine piston, and is disclosed in Japanese Patent Laid-Open Nos. 2001-200785, 2001-221151, etc., and this cooling method is applied to a motor chamber through a flow path separated from the swash plate chamber. Since the refrigerant flows into the swash plate chamber, the lubrication of the swash plate chamber is not sufficient, and the compression occurs only on one side, so the pulsation characteristics are not superior to those of the double head swash plate type, and the inclination angle of the swash plate needs to be increased. There was.

An object of the present invention for solving the above-mentioned conventional problems is that the external refrigerant is first sucked into the inverter housing and then supplied to the swash plate chamber and some of the refrigerant to cool the electric motor via the motor chamber, the suction The present invention provides an electric compressor that improves the overall performance of the electric compressor by preventing the cooling of the inverter by the refrigerant and lubricating the sliding part in the swash plate chamber, and improves the cooling efficiency of the electric motor.

Still another object is to provide an electric compressor with noise reduction and pulsation reduction effect by performing suction muffler function of the inner space of the inverter housing.

The present invention for achieving the above object is provided with a motor unit made of a motor housing having an electric motor for rotating the drive shaft in the inner motor chamber, and installed on one side of the motor portion, and each has a suction chamber and a discharge chamber at least A front and rear housing having a refrigerant discharge port in any one, and a cylinder block having a plurality of bores and installed between the front and rear housings, the swash plate and the swash plate to rotate together with the drive shaft in the swash plate chamber in the cylinder block In the electric compressor comprising a compression unit consisting of a piston reciprocating in the bore in cooperation with the compressor, the compression unit has a refrigerant suction port to suck the external refrigerant to supply to the swash plate chamber, the inverter having a motor control means therein A plurality of low-pressure passages for installing the housing and communicating the swash plate chamber and the motor chamber Is formed, the front housing is characterized in that a plurality of suction communication path is formed so that the refrigerant of the motor chamber flows into the suction chamber.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Repeated descriptions of the same parts as in the prior art are omitted.

1 is a cross-sectional view showing a motor-driven compressor according to the present invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line B-B in FIG.

As shown, the motor-driven compressor 1 of the present invention is coupled to the motor unit 10, one side of the motor unit 10, the compression unit for receiving the power from the motor unit 10 to compress the refrigerant ( 20).

First, the motor unit 10 includes a motor housing 11 having a motor chamber 12 in a predetermined space therein, and the motor chamber 12 includes an electric motor 13 for rotating the drive shaft 14. Is installed.

Here, one end of the drive shaft 14 is rotatably supported by a bearing (16a) provided on the inner surface of the motor housing 11 and the other end is extended to the rear cylinder block 42 to be described below also bearing It is rotatably supported by 16b.                     

The compression unit 20 includes a front housing 30 having a discharge chamber 32 and a suction chamber 31 inside and outside partitioned by the partition 33, and a plurality of axial bores 41a. A cylinder block 40 having a swash plate chamber 43 formed therein, which is formed by combining the front and rear cylinder blocks 41 and 42 having a 42a formed therein, and which is partitioned by a partition 63. It is composed of a rear housing 60 each having a discharge chamber 62 and a suction chamber 61 and a refrigerant discharge port 64 is formed so that the compressed refrigerant can be discharged to the outside is coupled to one side of the motor unit 10. .

Here, the suction chambers 31 and 61 may be formed inside the partition walls 33 and 63 and the discharge chambers 32 and 62 may be formed outside, and the refrigerant discharge port 64 may be formed in the front housing. It can also be formed in (30).

In addition, the swash plate chamber 43 inside the cylinder block 40 is inclined to the drive shaft 14 at an angle to the swash plate 50 to rotate with the drive shaft 14 and the outer circumference of the swash plate 50. A plurality of pistons 51 are installed under the shoe 52 to compress the refrigerant while linearly reciprocating the bore 41a and 42a in association with the rotational motion of the swash plate 50.

The piston 51 is preferably a double head piston.

The front and rear housings 30 and 60 respectively seal both sides of the cylinder block 40, and a valve plate 70 having an intake valve 71 and a discharge valve 72 is disposed therebetween. It is installed.

On the other hand, the discharge chamber 32 of the front housing 30 and the discharge chamber 62 of the rear housing 60 are communicated with each other by a connecting passage 38 formed in the cylinder block 40,                     

In addition, both ends of the swash plate 50 are rotatably supported by the thrust bearing 53 in the swash plate chamber 43.

In the electric compressor, one side of the compression unit 20 has a refrigerant suction port 81 to suck the refrigerant transferred from the outside to the swash plate chamber 43 and has a motor control means 82 therein. The built-in inverter housing 80 is installed.

That is, the inverter housing 80 is integrally formed on the upper and rear cylinder blocks 41 and 42, and a refrigerant inlet 81 is formed at one side to suck external refrigerant. A coolant passage 83 is further formed to communicate the interior of the inverter housing 80 with the swash plate chamber 43 so as to be supplied to the swash plate chamber 43.

The inverter housing 80 preferably performs a suction muffler function to form a predetermined space therein to obtain noise prevention and pulsation reduction effect when refrigerant is sucked from the outside.

Here, the motor control means 82 is preferably an inverter 82a.

On the other hand, the inverter housing 80 is not integrally formed in the front and rear cylinder blocks 41, 42 may be manufactured separately and combined.

In addition, the compression unit 20 communicates with the swash plate chamber 43 and the motor chamber 12 so that a part of the refrigerant supplied to the swash plate chamber 43 may flow into the motor chamber 12. Low rolling passages 34 and 41b are formed.

The low rolling passages 34 and 41b are formed to penetrate the front housing 30 and the front cylinder block 41.                     

In the front housing 30, the refrigerant introduced into the motor chamber 12 cools the electric motor 13 and is then sucked into the suction chamber 31 of the front housing 30. A plurality of suction communication paths 35 for communicating the 12 and the suction chamber 31 are formed.

On the other hand, in the rear cylinder block 42, the swash plate chamber 43 and the suction chamber so that a portion of the refrigerant supplied to the swash plate chamber 43 can be transferred to the suction chamber 61 of the rear housing 60. A plurality of suction flow paths 42b communicating 61 are formed.

As described above, the operation of the configured electric compressor 1 will be described.

The refrigerant transferred from the outside is introduced into the inverter housing 80 through the refrigerant suction opening 81 of the inverter housing 80. The introduced refrigerant cools the inverter 82a and at the same time performs a suction muffler function, and then is supplied to the swash plate chamber 43 through the refrigerant passage 83 communicating with the swash plate chamber 43. At this time, the refrigerant not only cools the swash plate chamber 43 but also oil contained in the refrigerant to lubricate sliding parts such as the swash plate 50, the shoe 52, and the piston 51.

Subsequently, some of the refrigerant in the swash plate chamber 43 is transferred to the motor chamber 12 through the low-pressure communication paths 34 and 41b communicating the swash plate chamber 43 and the motor chamber 12. The part is transferred to the suction chamber 61 of the rear housing 60 through the suction passage 42b for communicating the swash plate chamber 43 and the suction chamber 61 of the rear housing 60.

First, the refrigerant transferred to the motor chamber 12 serves to cool the heat generated from the electric motor 13 to prevent a decrease in magnetic flux due to overheating of the refrigerant to maintain the performance of the electric motor 13.                     

In addition, the refrigerant of the motor chamber 12 is introduced into the suction chamber 31 through the suction communication path 35 communicating the motor chamber 12 and the suction chamber 31 of the front housing 30. At the time of the suction stroke of the piston 51, the suction valve 71 of the valve plate 70 opens and at the same time the refrigerant in the suction chamber 31 is sucked into the bore 41a of the front cylinder block 41. .

Thereafter, the refrigerant is compressed to a high temperature / high pressure state according to the compression stroke of the piston 51 and discharged to the discharge chamber 31 of the front housing 30 through the discharge valve 72 of the valve plate 70. The discharged high temperature / high pressure refrigerant is transferred to the discharge chamber 62 of the rear housing 60 along the connection passage 38.

Next, the refrigerant transferred to the suction chamber 61 of the rear housing 60 is through the suction valve 71 of the valve plate 70 according to the suction / compression stroke of the piston 51 as described above. After being sucked into the bore 42a of the rear cylinder block 42 and compressed, the refrigerant is in a high temperature / high pressure state and the discharge chamber of the rear housing 60 through the discharge valve 72 of the valve plate 70. Discharged to (62).

The refrigerant discharged into the discharge chamber 62 of the rear housing 60 is transferred along the connection passage 38 from the discharge chamber 31 of the front housing 30 along with the refrigerant discharge port 64. It is discharged to the outside through.

Accordingly, the refrigerant introduced into the inverter housing 80 cools the inverter 82a to suppress heat generation of the inverter 82a, and the refrigerant introduced into the swash plate chamber 43 is formed in the swash plate chamber 43. Lubricates and cools the sliding part so as to operate smoothly, and the refrigerant introduced into the motor chamber 12 prevents the deterioration of the performance of the electric motor 13 through the cooling of the electric motor 13. Improve overall performance.

On the other hand, if the cooling of the motor unit 10 by using the entire refrigerant to be sucked, since the temperature and pressure of the refrigerant on the low pressure side further rises may cause a problem that the compression efficiency is lowered, according to the present invention, By cooling only the motor unit 10 using only a part, it is possible to prevent the compression efficiency decrease.

According to the electric compressor of the present invention, the external refrigerant is first sucked into the inverter housing and then supplied to the swash plate chamber, and some of the refrigerant to cool the electric motor via the motor chamber, thereby to the suction refrigerant By cooling the inverter and lubricating the sliding part in the swash plate chamber, heat generation of the inverter is suppressed and durability is improved, as well as the cooling efficiency of the electric motor is improved, so that the overall performance of the electric compressor is improved and the compression efficiency is also prevented. .

In addition, since the internal space of the inverter housing performs a suction muffler function, noise reduction and pulsation reduction effect when refrigerant is sucked.

Claims (6)

A motor unit 10 including a motor housing 11 having an electric motor 13 for rotating the drive shaft 14 in the motor chamber 12 therein; It is installed on one side of the motor unit 10, and has a suction chamber 31, 61 and discharge chamber 32, 62, respectively, and at least one of the front and rear housings having a refrigerant discharge port (64) ( 30 and 60, a cylinder block 40 installed between the front and rear housings 30 and 60 and having a plurality of bores 41a and 42a, and a swash plate chamber in the cylinder block 40 43 is a compression portion 20 consisting of a swash plate 50 which rotates together with the drive shaft 14 and a piston 51 reciprocating in the bores 41a and 42a in conjunction with the swash plate 50. In the electric compressor containing, The compressor 20 is provided with an inverter housing 80 having a refrigerant suction opening 81 and a motor control means 82 therein so as to suck external refrigerant and supply the refrigerant to the swash plate chamber 43. A plurality of low pressure communication paths 34 and 41b for communicating the swash plate chamber 43 and the motor chamber 12 are formed, and the refrigerant in the motor chamber 12 is sucked in the front housing 30. Electric compressor, characterized in that a plurality of suction communication path 35 is formed to be introduced into). The method of claim 1, The inverter housing 80 is formed on one side of the cylinder block 40, the refrigerant passage 83 is formed so that the interior of the inverter housing 80 and the swash plate chamber 43 is in communication with each other. compressor. The method of claim 1, The low rolling path (34) (41b) is a motor-driven compressor, characterized in that formed through the front housing (30) and the front cylinder block (41). The method of claim 1, The motor control means (82) is an electric compressor, characterized in that the inverter (82a). The method according to any one of claims 1 to 4, The cylinder block (40) is an electric compressor, characterized in that the connecting passage (38) for communicating the discharge chamber (32) (62) of the front and rear housings (30) (60). The method according to any one of claims 1 to 4, The piston 51 is an electric compressor, characterized in that the double head piston.

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