KR20060031532A - Motor driven compressor - Google Patents

Abstract

The present invention relates to a motor-driven compressor, and more particularly, to form an oil separation structure in the rear housing, to separate oil contained in the discharged refrigerant, and to supply it to the swash chamber so as to improve lubricity and durability without increasing the oil filling amount of the whole system. It relates to an electric compressor with improved.

Accordingly, the present invention includes a motor unit 10 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, the suction chamber 31, 61 and discharge chamber 32, 62 are formed, respectively, the front and rear housings with the refrigerant discharge port 64 formed on either side, and Front and rear cylinder blocks 41 and 42 having a plurality of bores 41a and 42a while being installed between the front and rear housings 30 and 60, and the front and rear cylinder blocks 41 and 42. A swash plate 50 which is installed in the swash plate chamber 43 and rotates together with the drive shaft 14 and a piston 51 which reciprocates inside the bores 41a and 42a in association with the swash plate 50. Compression unit 20; comprising an electric compressor configured to cool the electric motor 13 by inducing a coolant to the motor unit 10, the end of the drive shaft 14 on the rear housing (60) An oil storage chamber 68 is formed in a space communicating with the oil reservoir, and the oil reservoir separates oil contained in the refrigerant discharged from the refrigerant discharge port 64. The florisil oil chamber 65 is communicated through 68 and the oil passage (67) is characterized in that formation.

Electric compressor, electric motor, motor room, swash plate room, oil storage room, oil separation room

Description

Motor 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.

4 is a cross-sectional view taken along the line C-C in FIG.

<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: refrigerant inlet 16a, 16b: bearing

20: compression unit 30: front housing

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

33,63: bulkhead 34,41c: refrigerant supply hole

35: connecting passage 40: cylinder block

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

41b, 42b: Suction channel 42: Rear cylinder block

43: swashroom 45: oil supply passage                 

50: swash plate 51: piston

52: shoe 53: thrust bearing

60: rear housing 64: refrigerant outlet

65: oil separation chamber 65a: protrusion

66: discharge passage 67: oil passage

68: oil reservoir 70: valve unit

71: suction valve 72: discharge valve

73: through hole

The present invention relates to a motor-driven compressor, and more particularly, to form an oil separation structure in the rear housing, to separate oil contained in the discharged refrigerant, and to supply it to the swash chamber so as to improve lubricity and durability without increasing the oil filling amount of the whole system. It relates to an electric compressor with improved.

In general, the swash plate type 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 power of an engine by an intermittent action of an electronic clutch or directly receiving electric power from an electric motor. By rotating the swash plate, a plurality of pistons installed through the shoe on the outer circumference of the swash plate linearly reciprocate inside a plurality of bores formed in the cylinder block, thereby sucking / compressing the refrigerant transferred from the evaporator and discharging it to the condenser. It is configured to.

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.

On the other hand, the swash plate type compressor is referred to as a unilateral swash plate type compressor when the compression by the piston is performed on one side, and the case where it is made on both sides is called a double head swash plate type compressor.

As such, the electric compressor using the electric motor as a power source is composed of a motor unit in which the electric motor is installed and a compression unit compressing the refrigerant. The motor unit generates heat as the electric motor provided therein rotates at high speed. This causes a decrease in the overall performance of the electric compressor. Therefore, in the case of an electric compressor, it is an important subject to cool the motor part.

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

First, Japanese Patent Laid-Open No. Hei 9-32729 includes a scroll compressor in which an intake refrigerant first passes through the motor chamber to cool the motor and then undergoes a compression action in the compression section.

In addition, the swash plate compressor employing a migraine piston includes a method in which the suction refrigerant is guided to the motor unit, cooled, and recompressed through the low pressure side of the compressor, and the refrigerant compressed in the first piston using a multi-stage compression method. Was cooled by inducing the motor unit, and again compressed by the second piston and discharged. The above method is disclosed in Japanese Laid-Open Patent Publication No. 2001-200785.

However, the above-described conventional electric compressor can prevent the performance degradation by cooling the electric motor by inducing the refrigerant to the motor unit, but in this process, the oil contained in the refrigerant is also transferred along with the oil through the motor compartment. There is a problem that the amount of oil actually supplied to the compression part that remains in the motor chamber while being attached to the coil, the stator, the rotor and the inner wall, etc. of which lubrication is required is relatively insufficient.

Therefore, the lubrication and durability of the compression unit is lowered, as well as causing noise.

An object of the present invention for solving the above-mentioned problems is to guide the suction refrigerant to the motor unit to cool the electric motor as well as to form an oil separation structure in the rear housing to separate the oil contained in the discharged refrigerant to the swash chamber The present invention provides an electric compressor that improves lubricity and durability without increasing the oil filling amount of the entire system.

The present invention for achieving the above object is a motor unit having an electric motor for rotating the drive shaft in the inner motor chamber; It is installed on one side of the motor unit, the suction chamber and the discharge chamber is formed, respectively, the front and rear housings with a refrigerant discharge port formed on one side, and the front and rear cylinder blocks having a plurality of bores while being installed between the front and rear housings; And a compression unit installed in the swash plate chamber in the front and rear cylinder blocks and configured to include a swash plate rotating together with the driving shaft and a piston reciprocating inside the bore in conjunction with the swash plate. In the electric compressor configured to cool the electric motor, an oil storage chamber is formed in the space in communication with the end of the drive shaft on the rear housing, and the oil contained in the refrigerant discharged in the refrigerant discharge port and the It is characterized in that the oil separation chamber communicating with the oil reservoir and the oil passage is formed.

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

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, FIG. 3 is a cross-sectional view taken along the line B-B in FIG. 1, and FIG. 4 is a cross-sectional view taken along the line C-C 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.

In addition, a coolant suction opening 15 is provided at one side of the motor housing 11 to cool the electric motor 13 provided in the motor chamber 12 so that refrigerant from the outside may be sucked into the motor chamber 12. Is formed.

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. The front and rear cylinder blocks 41 and 42 having the 42a formed therein are coupled to the cylinder block 40 having a swash plate chamber 43 therein, and discharged to the inside and the outside partitioned by the partition 63, respectively. The rear housing 60 having the seal 62 and the suction chamber 61 and the coolant discharge port 64 formed thereon is sequentially configured to allow the compressed refrigerant to be discharged to the outside and 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 the partition walls 33 and 63.

In addition, the swash plate chamber 43 inside the cylinder block 40 is inclined at an angle to the drive shaft 14 to be rotated together with the drive shaft 14 and the outer circumference of the swash plate 50. A plurality of pistons 51 are mounted via the shoe 52 and interlock with the rotary motion of the swash plate 50 to compress the refrigerant while linearly reciprocating the inside of the bores 41a and 42a.                     

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 unit 70 having an intake valve 71 and a discharge valve 72 is disposed therebetween. It is installed.

In addition, the motor compartment 12 and the swash plate chamber 43 may be supplied to the compression unit 20 so that the refrigerant sucked into the motor chamber 12 may be supplied to the swash plate chamber 43 after cooling the electric motor 13. The plurality of coolant supply holes 34, 41c are formed to communicate.

Here, the coolant supply holes 34 and 41c are formed to penetrate the front housing 30 and the front cylinder block 41.

In addition, the refrigerant supplied to the swash plate chamber 43 may be transferred to the suction chambers 31 and 61 of the front and rear housings 30 and 60 in the front and rear cylinder blocks 41 and 42. Suction passages 41b and 42b are formed to communicate the swash plate chamber 43 and the suction chambers 31 and 61 so as to communicate with each other.

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 35 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 addition, an oil storage chamber 68 is formed on the rear housing 60 in a space communicating with an end of the drive shaft 14 to store oil.

In general, a space communicating with an end of the driving shaft 14 is formed on the rear housing 60. Such a space is called a dead zone because it is a useless space. In the present invention, the dead zone is an oil storage chamber. It was used as (68).

In addition, an oil separation chamber 65 having an extended lower side of the refrigerant discharge port 64 is formed in the refrigerant discharge port 64 so as to separate oil contained in the discharged refrigerant.

In addition, the oil passage 67 for communicating the bottom surface of the oil separation chamber 65 and the oil storage chamber 68 so that oil separated from the refrigerant and stored in the oil separation chamber 65 may be supplied to the oil storage chamber 68. ) Is formed.

In the rear housing 60, the refrigerant compressed in the bore 42a of the rear cylinder block 42 and introduced into the discharge chamber 62 of the rear housing 60 is discharged through the refrigerant discharge port 64. The discharge passage 66 communicating with the discharge chamber 62 and the oil separation chamber 65 of the refrigerant discharge port 64 may be formed.

Here, the discharge passage 66 passes through the discharge refrigerant while passing through the oil separation chamber 65 so as to make contact with the inner wall surface of the oil separation chamber 65 in an axial direction and a planar direction so as to allow more contact. Each angle is formed to be inclined.

Therefore, the refrigerant may pass through the oil separation chamber 65 while maximizing the oil separation effect of the refrigerant.

On the other hand, the discharge passage 66 may be formed to be eccentric with the oil separation chamber 65 so that the discharge refrigerant can pass through the oil separation chamber (65).

In addition, a protrusion 65a may be further formed on the inner wall surface of the oil separation chamber 65 so as to further increase the contact area with the discharge refrigerant.

The rear cylinder block 42 has an oil supply passage for communicating the oil storage chamber 68 and the swash chamber 43 so that oil stored in the oil storage chamber 68 can be supplied to the swash plate chamber 43. At least one 45 is formed.

In addition, a through hole 73 is provided at the center of the valve unit 70 provided between the rear cylinder block 42 and the rear housing 60 so that the end of the drive shaft 14 and the oil storage chamber 68 can communicate with each other. ) Is formed.

That is, the oil reservoir 68 is in communication with the end of the drive shaft 14 through the central through hole 73 of the valve unit 70 while the oil in the oil reservoir 68 is driven by the drive shaft 14. It can be easily supplied to the installation portion of the bearing (16b) for rotatably supporting the end of the.

In this way, when oil is supplied to the end side of the drive shaft 14, the lubricity of the bearing 16b supporting the drive shaft 14 is improved, and at the same time, after lubricating the bearing 16b, the oil is formed through the gap of the bearing 16b. After being introduced into the supply passage 45, it can be easily supplied to the swash plate chamber 43.

On the other hand, when the size of the central through-hole 73 of the valve unit 70 is constantly adjusted, the oil of the oil storage chamber 68 may be supplied to the end of the drive shaft 14 by a predetermined amount.

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

The refrigerant transferred from the outside is introduced into the motor chamber 12 through the refrigerant suction opening 15 of the motor housing 11. The introduced coolant acts to cool the heat generated by the electric motor 13, thereby preventing the deterioration of magnetic flux due to overheating of the refrigerant, thereby maintaining the performance of the electric motor 13, and then the front housing 30 and the front. It is supplied into the swash plate chamber 43 through the coolant supply holes 34 and 41c formed through the cylinder block 41.

The coolant supplied to the swash plate chamber 43 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. Will be

Subsequently, the refrigerant in the swash plate chamber 43 is suction chambers of the front and rear housings 30 and 60 along the suction passages 41b and 42b formed in the front and rear cylinder blocks 41 and 42. It is conveyed to 31 and 61, respectively.

The refrigerant in the suction chambers 31 and 61 is the front and rear cylinder blocks 41 and 42 at the same time the suction valve 71 of the valve unit 70 is opened during the suction stroke of the piston 51. Suction into the bores 41a and 42a.

Subsequently, the refrigerant is compressed to a high temperature / high pressure state according to the compression stroke of the piston 51 to discharge chambers of the front and rear housings 30 and 60 through the discharge valve 72 of the valve unit 70. And discharged into the discharge chamber 62 of the rear housing 60 along the connection passage 35 from the discharge chamber 32 of the front housing 30, respectively. The discharge chamber 66 is discharged into the oil separation chamber 65 through the discharge passage 66 in which the discharge chamber and the oil separation chamber 65 communicate with the refrigerant transferred.

The refrigerant discharged into the oil separation chamber 65 of the refrigerant discharge port 64 flows while turning the oil separation chamber 65. In this process, the oil contained in the refrigerant comes into contact with and collides with the wall surface of the oil separation chamber 65. The oil separated from the refrigerant flows downward through the wall and flows into the oil storage chamber 68 through the oil passage 67 to be stored.

Subsequently, the refrigerant passing through the oil separation chamber 65 is finally discharged through the refrigerant discharge port 64.

On the other hand, the oil stored in the oil storage chamber 68 is supplied to the end side of the drive shaft 14 through the central through hole 73 of the valve unit 70, the oil supplied to the end side of the drive shaft 14 Lubricates the bearing 16b rotatably supporting the end of the drive shaft 14 and flows into the oil supply passage 45 through the gap of the bearing 16b and then is supplied to the swash plate chamber 43. .

As described above, the refrigerant transferred from the outside is supplied to the swash plate chamber 43 of the compression unit 20 via the motor chamber 12 of the motor unit 10 and compressed and discharged. 13) is cooled, the overall performance of the electric compressor (1) is improved as the performance degradation of the electric motor (13) is prevented.

In addition, the oil contained in the discharge refrigerant is separated and stored in the oil storage chamber 68 in the oil separation chamber 65 of the refrigerant discharge port 64, and the oil stored therein is a bearing for supporting the end of the drive shaft 14. By lubricating the 16b and supplying it back to the swash plate chamber 43 through the oil supply passage 45, the lubrication of the sliding portion of the swash plate chamber 43 as well as the bearing 16b is further improved. Will be improved.

Therefore, even if some oil contained in the refrigerant remains in the motor chamber 12 while the suction refrigerant is supplied to the swash plate chamber 43 after passing through the motor chamber 12, the refrigerant is contained in the discharged refrigerant in the present invention. The separated oil is separated from the oil separation chamber 65 and stored in the oil storage chamber 68 and then re-supplied to the swash plate chamber 43 to further improve the lubricity without increasing the total oil filling amount.

As described above, in the present invention, the oil separation structure is formed in the rear housing 60 to separate the oil contained in the discharged refrigerant, and then resupply to the swash plate chamber 43 to lubricity and durability of the electric compressor 1. Although only the case where the improved configuration is applied to the double head plate type electric compressor 1 has been described, the same effect can be obtained even if the same is applied to various compressors such as a migraine plate type compressor and a wobble plate type compressor.

According to the present invention, by introducing the suction refrigerant to the motor unit to cool the electric motor to prevent the performance of the electric motor to improve the overall performance of the electric compressor, as well as the refrigerant discharged by forming an oil separation structure in the rear housing By separating the oil contained in and resupplying to the swash chamber, the lubricity and durability are improved without increasing the oil filling amount of the whole system.

Claims (5)

A motor unit 10 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, the suction chamber 31, 61 and discharge chamber 32, 62 are formed, respectively, the front and rear housings with the refrigerant discharge port 64 formed on either side, and Front and rear cylinder blocks 41 and 42 having a plurality of bores 41a and 42a while being installed between the front and rear housings 30 and 60, and the front and rear cylinder blocks 41 and 42. A swash plate 50 which is installed in the swash plate chamber 43 and rotates together with the drive shaft 14 and a piston 51 which reciprocates inside the bores 41a and 42a in association with the swash plate 50. Compression unit 20; configured to include, in the electric compressor configured to cool the electric motor 13 by inducing a refrigerant to the motor unit 10, An oil storage chamber 68 is formed in a space communicating with an end of the drive shaft 14 on the rear housing 60, and the oil contained in the refrigerant discharged is separated inside the refrigerant discharge port 64. An electric compressor, characterized in that the oil separation chamber (65) is formed in communication with the oil storage chamber (68) and the oil passage (67). The method of claim 1, The rear cylinder block (42) is an electric compressor, characterized in that the oil supply passage (45) for communicating the oil storage chamber (68) and the swash plate chamber (43) is formed. The method of claim 1, In the rear housing 60, the discharge passage 66 is formed to be inclined at a predetermined angle so as to communicate the discharge chamber 62 of the rear housing 60 and the oil separation chamber 65 of the refrigerant discharge port 64. compressor. The method of claim 1, Electric compressor, characterized in that the projection (65a) is formed on the inner wall surface of the oil separation chamber (65) so as to increase the contact area with the discharged refrigerant. The method of claim 1, Through holes 73 are formed in the valve unit 70 provided between the rear cylinder block 42 and the rear housing 60 so that the end of the drive shaft 14 and the oil storage chamber 68 can communicate. Electric compressor, characterized in that.

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