KR100941708B1 - Electrically driven compressor - Google Patents

Abstract

The present invention relates to a motor-driven compressor, and more particularly, after the external refrigerant is sucked into the muffler housing, part of the motor is supplied to the swash plate chamber, and part of the motor chamber is supplied to the motor chamber, thereby efficiently cooling the inverter and the electric motor to generate heat of the inverter. The present invention relates to an electric compressor that prevents a decrease in compression efficiency, improves compressor performance, and reduces noise and pulsation.

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 is provided with a muffler housing 80 formed with a refrigerant inlet 81 to suck an external refrigerant, and some of the refrigerant sucked into the muffler housing 80 is A first low pressure flow path 82 and a muffler housing 80 communicating the muffler housing 80 and the swash plate chamber 43 so as to be supplied to the swash plate chamber 43 and a part thereof to the motor chamber 12; Second low pressure passages 15, 35 and 83 are formed to communicate with the motor chamber 12, and the refrigerant in the motor chamber 12 may flow into the suction chamber 31 in the front housing 30. A plurality of suction communication path 34 is formed so as to be formed.

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

Description

Electrically driven compressor

1 is a cross-sectional view showing a motor-driven compressor according to a first embodiment of 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.

4 is a cross-sectional view showing a motor-driven compressor according to a second embodiment of the present invention.

<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

15,35,83: 2nd low pressure flow path 20: Compression part

30: front housing 31, 61: suction chamber

32, 62: discharge chamber 33, 63: partition wall

34: 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: muffler housing 81: refrigerant inlet

82: first low pressure flow path 84: motor control means

84a: inverter

The present invention relates to a motor-driven compressor, and more particularly, after the external refrigerant is sucked into the muffler housing, part of the motor is supplied to the swash plate chamber, and part of the motor chamber is supplied to the motor chamber, thereby efficiently cooling the inverter and the electric motor to generate heat of the inverter. The present invention relates to an electric compressor that prevents a decrease in compression efficiency, improves compressor performance, and reduces noise and pulsation.

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 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 to cool 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 after the external refrigerant is sucked into the muffler housing part is supplied to the swash plate chamber and part is supplied to the motor chamber, the cooling of the inverter by the suction refrigerant and the inside of the swash chamber The present invention provides an electric compressor that improves the overall performance of the electric compressor by preventing lubrication of the sliding part, and improves the cooling efficiency of the electric motor, and prevents heat generation and compression efficiency of the inverter.

Still another object is to provide an electric compressor with noise suppression and pulsation reduction effect as the inner space of the muffler housing performs a suction muffler function.

The present invention for achieving the above object is provided with a motor unit having 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 conjunction with, the compression unit is provided with a muffler housing formed with a refrigerant inlet to suck the refrigerant from the outside, and the suction inside the muffler housing Some of the refrigerant may be supplied to the swash plate chamber and some may be supplied to the motor chamber. A first low pressure passage communicating the muffler housing and the swash plate chamber and a second low pressure passage communicating the muffler housing and the motor chamber are formed, and the front housing has a plurality of suction communication paths so that refrigerant of the motor chamber can flow into the suction chamber. Characterized in that is formed.

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 a first embodiment of 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 side of the motor housing 11 and the other end extends to the rear cylinder block 42, which will be described below. 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, a muffler housing (80) having a refrigerant suction port (81) formed on one side of the compression unit (20) to suck the refrigerant transferred from the outside is installed.

In addition, some of the refrigerant sucked into the muffler housing 80 through the refrigerant inlet 81 is supplied to the swash plate chamber 43, and some of the refrigerant is supplied to the motor chamber 12. A first low pressure passage 82 for communicating the swash plate chamber 43 and a second low pressure passage 15, 35, 83 for communicating the muffler housing 80 and the motor chamber 12; .

Here, the muffler housing 80 is integrally formed on the upper and rear cylinder blocks 41 and 42.

In addition, the muffler housing 80 preferably forms a predetermined space therein to perform a suction muffler function so as to obtain noise prevention and pulsation reduction effect when the refrigerant is sucked from the outside.

On the other hand, the muffler housing 80 may be manufactured separately and combined without being integrally formed with the front and rear cylinder blocks 41 and 42.

In addition, the second low pressure passages 15, 35, and 83 are connected to one side of the muffler housing 80 and the front housing 30 so as to communicate the interior of the muffler housing 80 with the motor chamber 12. And it is formed through the motor housing (11).

In addition, the front housing 30, the refrigerant introduced into the motor chamber 12 through the second low pressure passage (15, 35, 83) cools the electric motor 13 and then the front housing ( A plurality of suction communication paths 34 communicating with the motor chamber 12 and the suction chamber 31 are formed to be sucked into the suction chamber 31 of the 30.

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 muffler housing 80 through the refrigerant inlet 81 of the muffler housing 80. After the introduced refrigerant performs a suction muffler function, a part of the refrigerant is supplied to the swash plate chamber 43 through the first low pressure passage 82 which communicates the muffler housing 80 and the swash plate chamber 43. Is supplied to the motor chamber 12 through the second low pressure passages 15, 35 and 83 which communicate the muffler housing 80 and the motor chamber 12.

First, the coolant supplied 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 coolant to maintain the performance of the electric motor 13.

The refrigerant in the motor chamber 12 is introduced into the suction chamber 31 through a suction communication path 34 communicating the motor chamber 12 and the suction chamber 31 of the front housing 30. At this time, the suction valve 71 of the valve plate 70 is opened during the suction stroke of the piston 51 and the refrigerant of the suction chamber 31 is sucked into the bore 41a of the front cylinder block 41. do.

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 coolant supplied to the swash plate chamber 43 not only cools the swash plate chamber 43, but also some oil contained in the coolant is moist, such as the swash plate 50, the shoe 52, and the piston 51. The eastern part is lubricated, and is then transferred to the suction chamber 61 of the rear housing 60 through the suction channel 42b of the rear cylinder block 42.

Thereafter, the refrigerant transferred to the suction chamber 61 of the rear housing 60 is rearward 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 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. 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.                     

Therefore, the refrigerant introduced into the muffler housing 80 has a noise suppression and pulsation reduction effect by the suction muffler function, and the refrigerant introduced into the swash plate chamber 43 lubricates the sliding part inside the swash plate chamber 43. And cooling to smoothly operate, and the refrigerant introduced into the motor chamber 12 prevents performance degradation of the electric motor 13 through cooling of the electric motor 13 to improve the overall performance of the electric compressor 1. Will be improved.

Meanwhile, when the motor unit 10 is cooled by using the entire refrigerant sucked from the outside, the refrigerant temperature and pressure on the low pressure side may be further increased, which may cause a problem that the compression efficiency is lowered. It is possible to prevent the compression efficiency decrease by cooling the motor unit 10 using only a part of the refrigerant.

FIG. 4 is a cross-sectional view showing a motor-driven compressor according to a second embodiment of the present invention. Only the configuration different from the above-described first embodiment will be described, and repeated descriptions will be omitted.

As shown, in the second embodiment, the motor control means 84 for controlling the electric motor 13 is further installed in the muffler housing 80.

Here, the motor control means 84 is preferably an inverter 84a.

Therefore, the heat generation of the inverter 84a can be suppressed by cooling the inverter 84a by using the suction refrigerant introduced through the refrigerant inlet 81 of the muffler housing 80.

According to the electric compressor of the present invention, after the external refrigerant is sucked into the muffler housing part is supplied to the swash plate chamber and part is supplied to the motor chamber, the cooling of the inverter by the suction refrigerant and the sliding part in the swash chamber By lubricating, heat generation of the inverter is suppressed and durability is improved, as well as 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 inner space of the muffler housing performs a suction muffler function, noise reduction and pulsation reduction effect when the refrigerant is sucked.

Claims (7)

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 compression unit 20 is provided with a muffler housing 80 in which a refrigerant suction opening 81 is formed so as to suck external refrigerant, and some of the refrigerant sucked into the muffler housing 80 is the swash plate chamber 43. ) And the first low pressure passage 82 and the muffler housing 80 and the motor chamber 12 communicating the muffler housing 80 and the swash plate chamber 43 so that a part thereof may be supplied to the motor chamber 12. Second low pressure flow passages 15, 35, 83 are formed to communicate with each other, and the front housing 30 has a plurality of suction communication so that the refrigerant of the motor chamber 12 may flow into the suction chamber 31. Electric compressor characterized in that the furnace 34 is formed. The method of claim 1, The muffler housing (80) is characterized in that formed on one side of the cylinder block (40). The method of claim 1, Motor compressor means 84 is installed inside the muffler housing (80). The method of claim 1, The second low pressure flow path (15) (35) (83) is a motor-driven compressor, characterized in that formed through the one side of the muffler housing (80) and the front housing (30) and the motor housing (11). The method of claim 3, wherein The motor control means (84) is an electric compressor, characterized in that the inverter (84a). The method according to any one of claims 1 to 5, 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 5, The piston 51 is an electric compressor, characterized in that the double head piston.

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