KR101164818B1 - Rotary compressor and air conditioner having the same - Google Patents

Abstract

The present invention relates to a rotary compressor and an air conditioner having the same, the rotary compressor according to the present invention includes a rotating shaft; A driving motor coupled to one side of the rotation shaft to provide a rotation force; A rotary cam provided eccentrically on the other side of the rotary shaft to support a rolling piston rotating inside the cylinder provided under the drive motor; An upper radial bearing and a lower radial bearing provided on upper and lower portions of the rolling piston to radially support the rotating shaft; And an axial support having a first support member provided between the drive motor and the upper radial bearing and a second support member provided between the rotary cam and the lower radial bearing. As a result, the load applied to the drive motor can be reduced, and the start of the drive motor can be facilitated.

Description

ROTARY COMPRESSOR AND AIR CONDITIONER HAVING THE SAME

1 is a perspective view of an air conditioner according to an embodiment of the present invention;

2 is a cross-sectional view showing a first embodiment of the rotary compressor of FIG.

FIG. 3 is an enlarged cross-sectional view of a portion “III” of FIG. 2;

4 is an enlarged cross-sectional view of a portion “IV” of FIG. 2;

5 is an exploded perspective view of the axial support of FIG.

6 is a cross-sectional view showing an operating state of FIG.

7 is a cross-sectional view showing a second embodiment of the rotary compressor of FIG.

Explanation of symbols on the main parts of the drawings

100: air conditioner 110: indoor unit

120: outdoor unit 123: outdoor heat exchanger

210: rotary compressor 215: compressor casing

220: drive motor 230: rotating shaft

241: rolling piston 243: rotating cam

250: upper radial bearing 260: lower radial bearing

270: axial support 271: first support member

273: second support member

The present invention relates to a rotary compressor and an air conditioner having the same, and more particularly, to a rotary compressor having an improved structure for supporting a rotating shaft and an air conditioner having the same.

Generally, the air conditioner is driven in the heating mode and the cooling mode at the request of the user. Warms the room in the heating mode in cold winters and cools the room in the cooling mode in hot summers. In addition, it regulates the humidity of the room, and controls the air in a comfortable clean state.

In general, the air conditioner includes an indoor unit equipped with an indoor heat exchanger and an indoor fan for cooling or heating an indoor room, and an outdoor unit having an outdoor heat exchanger, an outdoor fan, a rotary compressor, and the like.

The heating cycle in the heating mode first compresses the refrigerant in the rotary compressor. The compressed refrigerant may be supplied to an indoor heat exchanger, and warm air may be released to the indoor side by heat exchange to keep the room warm.

The cooling cycle by the cooling mode first compresses the refrigerant in the rotary compressor. The compressed refrigerant may be supplied to an outdoor heat exchanger, and cold air may be discharged to the indoor side by heat exchange to keep the indoor cold. Then, the refrigerant passing through the room is supplied to the outdoor heat exchanger.

In the cooling and heating process, the rotary compressor repeats the compression process through the refrigerant, and in the air conditioner, the compression, condensation, expansion, and evaporation processes are continuously performed.

In general, a rotary compressor includes a drive shaft rotated by a change in magnetic flux between a stator and a rotor, a rolling piston coupled to an eccentric portion of the drive shaft and rotated in an inner space of the cylinder according to the rotation of the drive shaft, and radially at one side of the cylinder. It is inserted so as to be capable of linear reciprocating movement, and its end is in line contact with the outer circumferential surface of the rolling piston and includes a vane for converting the space formed by the inner circumferential surface of the cylinder and the outer circumferential surface of the rolling piston into a compression chamber and a discharge chamber. The vanes are housed in a vane chamber formed on one side of the cylinder to allow access to the rolling piston.

In addition, a radial load acting in the transverse direction of the rotary shaft and a thrust load acting in the rotary shaft direction are generated while the rotary compressor is rotated. Radial bearings support these radial and thrust loads.

However, in the related art, since the radial bearing supports the thrust load acting in the axial direction of the rotating shaft while contacting, the load applied to the motor during operation by the friction force according to the contact increases. In addition, if the contact surface lacks lubrication, the driving force for driving the rotating shaft increases, and there is a fear that fine particles or the like may be mixed in the compression chamber due to an increase in wear. In addition, the startup of the rotary compressor has a problem that the start is not properly.

Accordingly, an object of the present invention is to provide a rotary compressor and an air conditioner having the same capable of reducing the load applied to the drive motor.

Another object of the present invention is to provide a rotary compressor and a rotary compressor and an air conditioner having the same, which can facilitate starting of a drive motor.

Still another object of the present invention is to provide a rotary compressor and a rotary compressor and an air conditioner having the same, which can reduce wear of the friction part.

According to the present invention, there is provided a rotary compressor comprising: a rotating shaft; A driving motor coupled to one side of the rotation shaft to provide a rotation force; A rotary cam provided eccentrically on the other side of the rotary shaft to support a rolling piston rotating inside the cylinder provided under the drive motor; An upper radial bearing and a lower radial bearing provided on upper and lower portions of the rolling piston to radially support the rotating shaft; And an axial support having a first support member provided between the drive motor and the upper radial bearing and a second support member provided between the rotary cam and the lower radial bearing. Is achieved by

The axial support portion supports the axial load of the rotary shaft during the rotation of the rotary shaft, spaced apart between the upper radial bearing and the rotary cam in the state that the axial support is coupled to the rotary shaft. It is done.

The upper radial bearing may include a first lower surface, and the rotary cam may include an upper cam surface, and may be spaced apart from the first lower surface and the upper cam surface.

The upper radial bearing further includes a first upper surface, the driving motor includes a motor lower surface, and the first support member is coupled between the first upper surface and the motor lower surface. .

The lower radial bearing further includes a second upper surface, the rotating cam further includes a lower cam surface, and the second support member is coupled between the second upper surface and the lower cam surface.

The first support member and the second support member, characterized in that it comprises a thrust ball bearing and a pair of thrust rings rotatably contacting the thrust ball bearing on both sides of the thrust ball bearing.

On the other hand, an object of the present invention is a compression compressor, comprising: a rotating shaft; A driving motor coupled to one side of the rotation shaft to provide a rotation force; A first rotating cam and a second rotating cam eccentrically provided on the other side of the rotating shaft to support the first rolling piston and the second rolling piston which rotate inside the plurality of cylinders provided under the driving motor; An upper radial bearing and a lower radial bearing provided on an upper portion of the first rolling piston and a lower portion of the second rolling piston to support the rotation axis in a radial direction; And an axial support having a first support member provided between the drive motor and the upper radial bearing and a second support member provided between the second rotary cam and the lower radial bearing. Achieved by a compressor.

The axial support portion supports the axial load of the rotary shaft while the rotary shaft rotates, and is spaced apart from the upper radial bearing and the first rotary cam while the axial support portion is coupled to the rotary shaft. It is characterized by.

And further comprising an intermediate plate interposed between the first rotary cam and the second rotary cam, wherein at least one of the first rotary cam and the intermediate plate and between the second rotary cam and the intermediate plate are spaced apart from each other. do.

On the other hand, an object of the present invention, an air conditioner, comprising a rotary compressor for compressing a refrigerant, the rotary compressor, the rotary shaft; A driving motor coupled to one side of the rotation shaft to provide a rotation force; A rotary cam supporting a rolling piston coupled to the other side of the rotating shaft rotatably inside a cylinder provided under the drive motor; An upper radial bearing and a lower radial bearing provided on upper and lower portions of the rolling piston to radially support the rotating shaft; And an axial support having a first support member provided between the drive motor and the upper radial bearing and a second support member provided between the rotary cam and the lower radial bearing. Is achieved by

The axial support portion supports the axial load of the rotary shaft in the course of the rotation of the rotating shaft, the space between the upper radial bearing and the rotary cam in the state in which the axial support is coupled to the rotating shaft. do.

The first support member and the second support member, characterized in that it comprises a thrust ball bearing and a pair of thrust rings rotatably contacting the thrust ball bearing on both sides of the thrust ball bearing.

On the other hand, an object of the present invention, an air conditioner, comprising a rotary compressor for compressing a refrigerant, the rotary compressor, the rotary shaft; A driving motor coupled to one side of the rotation shaft to provide a rotation force; A first rotating cam and a second rotating cam eccentrically provided on the other side of the rotating shaft to support the first rolling piston and the second rolling piston which rotate inside the plurality of cylinders provided under the driving motor; An upper radial bearing and a lower radial bearing provided on an upper portion of the first rolling piston and a lower portion of the second rolling piston to support the rotation axis in a radial direction; And an axial support having a first support member provided between the drive motor and the upper radial bearing and a second support member provided between the second rotary cam and the lower radial bearing. Achieved by the harmonic.

The axial support portion supports the axial load of the rotary shaft while the rotary shaft rotates, and is spaced apart from the upper radial bearing and the first rotary cam while the axial support portion is coupled to the rotary shaft. It is characterized by.

And further comprising an intermediate plate interposed between the first rotary cam and the second rotary cam, wherein at least one of the first rotary cam and the intermediate plate and between the second rotary cam and the intermediate plate are spaced apart from each other. do.

Hereinafter, with reference to the accompanying drawings, an air conditioner according to the present invention. The air conditioner may include not only a ceiling type but also a window recess type and an indoor stand type. Hereinafter, an air conditioner having an indoor unit and an outdoor unit will be described as an embodiment of the present invention.

Prior to the description, in various embodiments, components having the same configuration will be representatively described in the first embodiment using the same reference numerals, and in other embodiments, only the configuration different from the first embodiment will be described. do.

First Embodiment

1 to 5, the air conditioner 100 according to the first embodiment of the present invention includes a rotary compressor 210. The air conditioner 100 includes an outdoor fan 123 and an outdoor unit 120. The air conditioner includes an indoor unit (not shown).

The outdoor unit 120 includes a rotary compressor 210, an outdoor fan 123, and an outdoor heat exchanger 125. The outdoor unit 120 further includes a casing 127 and a refrigerant pipe 129. The outdoor unit 120 further includes a controller (not shown) electrically connected to the indoor unit to control the driving units 210 and 123 by the indoor unit and the electrical signal and power supply.

The driving units 210 and 123 include a rotary compressor 210 and an outdoor fan 123. The driving units 210 and 123 may include other components driven by an inverter in addition to the rotary compressor 210 and the outdoor fan 123.

The outdoor fan 123 is installed in close proximity to the outdoor heat exchanger 125 to contact the outdoor air with the outdoor heat exchanger 125 to heat exchange the outdoor heat exchanger 125 with the outdoor air.

The outdoor heat exchanger 125 is installed in close proximity to the outdoor fan 123 to provide a wide contact area for heat exchange with the outside air.

The casing 127 accommodates the driving units 210 and 123 and the outdoor heat exchanger 125 to form an exterior.

The refrigerant pipe 129 receives the refrigerant and allows the outdoor unit 120 to enter and exit the indoor unit.

For convenience of explanation, hereinafter, each direction is defined as follows. First, the direction in which the rotary shaft 230 of the rotary compressor 210 is assembled in the vertical state is in the "X" direction, and the horizontal direction in the "X" direction, which is the vertical direction, is the "Y" direction, and the vertical direction is " The front-rear direction of the horizontal direction of an X "direction is defined as a" Z "direction (not shown).

The rotary compressor 210 includes a rotary shaft 230, a drive motor 220, a rotary cam 243, an upper radial bearing 250 and a lower radial bearing 260, and an axial support 270. It includes. The rotary compressor 210 has a compressor casing 215, a rolling piston 241, and a cylinder 240. Rotary compressor 210 may further include an accumulator (not shown) having a gas-liquid separation tube (not shown). The rotary compressor 210 inhales and compresses the refrigerant evaporated in the evaporator (not shown) to increase the pressure, thereby making it possible to liquefy (the gas becomes liquid) even at a relatively high temperature. The rotary compressor 210 allows the refrigerant to flow through the refrigerant pipe 129.

The compressor casing 215 forms a exterior of the rotary compressor 210 and includes a refrigerant discharge port (not shown) coupled to the top to guide discharge of the compressed high pressure refrigerant.

The driving motor 220 includes a stator 221 that receives power and forms a magnetic field, and a rotor 223 rotatably installed on the stator 221 and coupled to the rotation shaft 230.

The rotating shaft 230 is provided in an elongated rod shape to transmit the rotational force of the rotor 223 to the rolling piston 241. The rotating shaft 230 includes an eccentric rotary cam 243 which is eccentrically protruded from the center of the shaft at a portion coupled with the rolling piston 241.

As the rotating shaft 230 rotates, a radial load, which is a load acting on the "X-Z" plane, and a thrust load, which is a load acting in the "Y" direction, are generated. The radial load of the rotary shaft 230 is supported by the upper radial bearing 250 and the lower radial bearing 260. In addition, the thrust load of the rotation shaft 230 is supported by the axial support 270.

Thus, the rotary shaft 230 may be stably rotated because it does not have a portion supported while being in surface contact and friction in the axial direction, thereby reducing the load of the driving motor 220.

The cylinder 240 is formed to allow the compressed refrigerant to enter and exit the lower region of the compressor casing 215. The cylinder 240 may communicate with an opening / closing valve (not shown) and the like to allow the refrigerant to be sucked into and discharged from the cylinder 240. The rolling piston 241 is disposed eccentrically in the cylinder 240.

The rolling piston 241 is coupled to the rotary cam 243 of the rotary shaft 230 and rotates together with the rotary cam 243 according to the rotation of the rotary shaft 230.

The vane is not shown, is coupled to the cylinder 240 so that the linear reciprocating motion in the direction "X" of the rotation axis 230, the end thereof is in line contact with the outer peripheral surface of the rolling piston 140 inside the cylinder Is converted into a compression chamber and a discharge chamber.

The rotary cam 243 is provided below the rotary shaft 230 and coupled to the rolling piston 241. The rotary cam 243 includes an upper cam surface 245 close to the upper radial bearing 250 and a lower cam surface 247 in contact with the second support member 273.

The upper radial bearing 250 is coupled to the rotating shaft 230 between the rotor 223 and the cylinder 240. The upper radial bearing 250 faces the first lower surface 251 facing the motor lower surface 223a of the rotor 223 and the first lower surface facing the upper cam surface 245 of the rotary cam 243 ( 253). The first support member 271 is closely coupled to the first upper surface 251. The upper radial bearing 250 supports the radial load of the rotation of the rotary shaft 230 from the top.

The lower radial bearing 260 is coupled to the rotary shaft 230 under the cylinder 240. The lower radial bearing 260 includes a second upper surface 261 facing the lower cam surface 247 of the rotary cam 243. The second support member 273 is closely coupled to the second upper surface 261. The lower radial bearing 260 supports the radial radial load of the rotary shaft 230 from below.

Thus, the radial bearings 250 and 260 can stably support the radial load caused by the rotation of the rotary shaft 230.

The axial support 270 includes a first support member 271 and a second support member 273.

The space between the upper radial bearing 250 and the rotary cam 243 in a state where the first support member 271 and the second support member 273, which are the axial support 270, is coupled to the rotary shaft 230. desirable. Accordingly, since the rotary cam 243 and the upper radial bearing 250 are not in surface contact, mutual friction does not occur, and thus the load of the driving motor 220 may be reduced. In addition, wear does not occur between the rotary cam 243 and the first lower surface 253 of the upper radial bearing 250 while the rotating shaft 230 rotates. Therefore, foreign matters due to wear are not mixed into the cylinder 240, thereby improving reliability of the rotary compressor 210.

The first support member 271 is provided between the rotor 223 constituting the driving motor 220 and the upper radial bearing 250. The first support member 271 is coupled to the rotation shaft 230 in close proximity to the motor lower surface 223a of the rotor 223 and the first upper surface 251 of the upper radial bearing 250.

The second support member 273 is provided between the rotary cam 243 and the lower radial bearing 260. The second support member 273 is coupled to the rotation shaft 230 in proximity to the lower cam surface 247 of the rotary cam 243 and the second upper surface 261 of the lower radial bearing 260.

Accordingly, the first support member 271 and the second support member 273 can stably support the thrust load, which is a load generated in the “Y” direction, which is the axial direction of the rotation shaft 230.

In one embodiment, the first support member 271 and the second support member 273 preferably include a thrust ball bearing 275 and a thrust ring 277. The thrust ball bearing 275 includes a thrust ball 275a and a ball case 275b for supporting the thrust ball 275a at predetermined intervals.

However, the first support member 271 and the second support member 273 are not limited to this embodiment but may include various means known in the range satisfying the technical idea of the present invention.

Here, the first support member 271 and the second support member 273 are the motor lower surface 223a and the upper radial bearing 250 and the lower cam surface 247 of the rotary cam 243 of the rotor 223. And the lower radial bearing 260 are preferably coupled to each other. Thus, the rotation shaft 230 may be prevented from moving in the "Y" direction while rotating.

However, if necessary, only one of the support members 271 and 273 may be coupled in close contact with one of the radial bearings 250 and 260. At this time, the support members 271 and 273 that are not in contact with the radial bearings 250 and 260 maintain the gap with the radial bearings 250 and 260 to minimize the movement of the rotational axis 230 in the "Y" direction. To minimize.

With this configuration, the operation of the rotary compressor 210 of the air conditioner 100 according to an embodiment will be described with reference to FIG. 6 as follows.

When power is applied to the air conditioner 100, a current is supplied to the drive motor 220 of the rotary compressor 210. Accordingly, the rotation shaft 230 coupled to the rotor 223 and the rotor 223 rotates by the interaction between the stator 221 and the rotor 223. The rolling piston 241 coupled to the outer circumferential surface of the rotating cam 243 also rotates as the rotating cam 243 provided below the rotating shaft 230 rotates. In this case, the suction chamber and the compression chamber are partitioned by vanes coupled to the cylinder 240 and in contact with the rolling piston 241, and the refrigerant is sucked, compressed and discharged by the rotation of the rolling piston 241.

At this time, when the rotating shaft 230 rotates, the force acting in the "Y" direction, which is the axial direction of the rotating shaft 230, the rotating shaft 230 including the first support member 271 and the second support member 273. Is supported by an axial support 270 coupled thereto.

That is, the thrust ball 275a of the thrust ball bearing 275 is in rolling contact with the thrust ring 277 to support the thrust load of the rotation shaft 230 in the "Y" direction.

Therefore, the thrust load is supported by the axial support part 270 in the process of rotating the rotary shaft 230 can minimize the area of the surface contact with the rotary shaft 230. Therefore, the starting load of the driving motor 220 and the load due to driving can be reduced.

Second Embodiment

The air conditioner 300 according to the second embodiment of the present invention includes a rotary compressor 310, as shown in FIG.

The rotary compressor 310 is coupled to one side of the rotary shaft 330, the rotary shaft 330 to provide a rotational force, and eccentrically provided on the other side of the rotary shaft 330 is provided below the drive motor 220 A first cylinder 340a and a second cylinder 340b which are a plurality of cylinders are included. The rotary compressor 310 may include a first rotating cam 343a supporting the first rolling piston 341a and the second rolling piston 341b, which respectively rotate the inside of the first cylinder 340a and the second cylinder 340b. The second rotary cam 343b is included. The rotary compressor 310 is provided on the upper part of the first rolling piston 341a and the lower part of the second rolling piston 341b to support the upper radial bearing 350 and the lower radial bearing 360 in the radial direction of the rotating shaft 330. More). The rotary compressor 310 is provided between the first support member 371 provided between the drive motor 220 and the upper radial bearing 350, and the second rotary cam 343b and the lower radial bearing 360. And an axial support 370 having two support members 373.

Here, the second embodiment is characterized in that the double rotary compressor 310 compared to the first embodiment. That is, it has a plurality of cylinders 340a and 340b including the first cylinder 340a and the second cylinder 340b. Here, three or more cylinders 340a and 340b may be provided as necessary.

Here, the axial support 370 supports the axial load of the rotary shaft 330 during the rotation of the rotary shaft 330, the upper radial bearing in the state in which the axial support 370 is coupled to the rotary shaft 330 It is preferable that the space between the 350 and the first rotary cam (343a). Since this has been described in the first embodiment, it will be omitted below.

In addition, the rotary compressor 310 further includes an intermediate plate 380 interposed between the first rotary cam 343a and the second rotary cam 343b, and the first rotary cam 343a and the intermediate plate 380. At least one of the space between the second rotary cam 243b and the intermediate plate 380 is preferably spaced apart. That is, between the first lower cam surface 345b of the first rotary cam 343a and the plate upper surface 281 of the intermediate plate 380 or between the second upper cam surface 347a of the second rotary cam 243b. At least one of the plate lower surfaces 283 of the plate 380 is preferably spaced apart.

Therefore, the first rotary cam 243a and the second rotary cam 343b of the rotary shaft 330 are not in surface contact with the intermediate plate 380 during the rotation of the rotary shaft 330, as described in the first embodiment. The effect can be obtained.

Since the operation process of the air conditioner 300 according to the second embodiment of the present invention is the same as or similar to the first embodiment described above, a description thereof will be omitted below.

In addition, the air conditioner according to the present invention is not applied only to the above-described embodiments, but may be applied to various types of air conditioners.

As described above, according to the present invention, the load applied to the drive motor can be reduced.

In addition, the driving motor can be easily started.

In addition, it is possible to reduce the wear of the friction portion, it is possible to reduce the generation of foreign matter to improve the reliability of the rotary compressor.

Claims (15)

In a rotary compressor, A rotating shaft; A driving motor coupled to one side of the rotation shaft to provide a rotation force; A rotary cam provided eccentrically on the other side of the rotary shaft to support a rolling piston rotating inside the cylinder provided under the drive motor; An upper radial bearing and a lower radial bearing provided on upper and lower portions of the rolling piston to radially support the rotating shaft; An axial support having a first support member provided between the drive motor and the upper radial bearing and a second support member provided between the rotary cam and the lower radial bearing, The axial support portion, And a rotational load supporting the axial load of the rotating shaft while the rotating shaft is rotated, and spaced apart from the upper radial bearing and the rotating cam while the axial support part is coupled to the rotating shaft. delete The method of claim 1, The upper radial bearing includes a first lower surface, The rotating cam includes an upper cam surface, Rotary compressor, characterized in that spaced apart between the first lower surface and the upper cam surface. The method of claim 3, The upper radial bearing further includes a first upper surface, The drive motor includes a motor lower surface, The first support member is a rotary compressor, characterized in that coupled between the first upper surface and the motor lower surface. 5. The method of claim 4, The lower radial bearing further includes a second upper surface, The rotating cam further includes a lower cam surface, The second support member is a rotary compressor, characterized in that coupled between the second upper surface and the lower cam surface. The method of claim 1, The first support member and the second support member, And a thrust ball bearing and a pair of thrust rings rotatably contacting the thrust ball bearings on both sides of the thrust ball bearing, respectively. In a rotary compressor, A rotating shaft; A driving motor coupled to one side of the rotation shaft to provide a rotation force; A first rotating cam and a second rotating cam eccentrically provided on the other side of the rotating shaft to support the first rolling piston and the second rolling piston which rotate inside the plurality of cylinders provided under the driving motor; An upper radial bearing and a lower radial bearing provided on an upper portion of the first rolling piston and a lower portion of the second rolling piston to support the rotation axis in a radial direction; An axial support having a first support member provided between the drive motor and the upper radial bearing and a second support member provided between the second rotary cam and the lower radial bearing, The axial support portion, A rotary compressor supporting an axial load of the rotating shaft while the rotating shaft rotates, and spaced between the upper radial bearing and the first rotating cam in a state in which the axial support portion is coupled to the rotating shaft. . delete The method of claim 7, wherein Further comprising an intermediate plate interposed between the first rotary cam and the second rotary cam, And at least one of the first rotary cam and the intermediate plate and the second rotary cam and the intermediate plate are spaced apart from each other. In air conditioners, It includes a rotary compressor for compressing the refrigerant, The rotary compressor, A rotating shaft; A driving motor coupled to one side of the rotation shaft to provide a rotation force; A rotary cam supporting a rolling piston coupled to the other side of the rotating shaft rotatably inside a cylinder provided under the drive motor; An upper radial bearing and a lower radial bearing provided on upper and lower portions of the rolling piston to radially support the rotating shaft; An axial support having a first support member provided between the drive motor and the upper radial bearing, and a second support member provided between the rotary cam and the lower radial bearing, The axial support portion supports the axial load of the rotary shaft in the process of rotating the rotary shaft, And the space between the upper radial bearing and the rotary cam in a state in which the axial support is coupled to the rotary shaft. delete The method of claim 10, The first support member and the second support member, And a thrust ball bearing and a pair of thrust rings rotatably contacting the thrust ball bearings on both sides of the thrust ball bearing, respectively. In air conditioners, It includes a rotary compressor for compressing the refrigerant, The rotary compressor, A rotating shaft; A driving motor coupled to one side of the rotation shaft to provide a rotation force; A first rotating cam and a second rotating cam eccentrically provided on the other side of the rotating shaft to support the first rolling piston and the second rolling piston which rotate inside the plurality of cylinders provided under the driving motor; An upper radial bearing and a lower radial bearing provided on an upper portion of the first rolling piston and a lower portion of the second rolling piston to support the rotation axis in a radial direction; An axial support having a first support member provided between the drive motor and the upper radial bearing and a second support member provided between the second rotary cam and the lower radial bearing, The axial support portion, Air conditioning, characterized in that for supporting the axial load of the rotary shaft during the rotation of the rotary shaft, the space between the upper radial bearing and the first rotary cam in the state that the axial support is coupled to the rotary shaft. group. delete 14. The method of claim 13, Further comprising an intermediate plate interposed between the first rotary cam and the second rotary cam, And at least one of the first rotary cam and the intermediate plate and the second rotary cam and the intermediate plate are spaced apart from each other.

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