KR20000042356A - Structure for supplying oil of rotary compressor - Google Patents

Abstract

PURPOSE: A rotary compressor is provided to perform compression smoothly by installing an oil pipe supplying oil between inner walls of a roller and a cylinder. CONSTITUTION: After power is fed to a motor assembly(315), a rotary shaft(317) starts to rotate by the electromagnetic interaction of a stator and a rotor(319). One end of the rotary shaft is installed and an eccentric part(322) installed in a cylinder(332) starts to rotate. By the rotation of the eccentric part, a roller(330) rotates. The roller is combined to the eccentric part integrally and then the roller rotates eccentrically. The inner part of the cylinder is divided into two parts of suction and ventilation by the roller. While the roller rotates, the suction part becomes in a low pressure state. The oil stored in an oil tank(309) is sucked into an oil supply pipe(350) and supplied to a gap(354) between the inner walls of the roller and the cylinder by passing through an oil groove(358) and an oil channel(352). By the oil, the roller smoothly contacts to the inner wall of the cylinder.

Description

Oil supply structure of rotary compressor

The present invention relates to a rotary compressor, and more particularly, to a rotary compressor having an oil supply passage capable of smoothly supplying oil between a roller and a cylinder.

In general, the air conditioner is a device for maintaining the temperature and humidity suitable for the human body by harmonizing the air in the home or office.

The air conditioner includes a main body, a compressor for compressing the refrigerant gas at high temperature and high pressure to perform a cooling cycle, a condenser for condensing the refrigerant gas of the high temperature and high pressure refrigerant from the compressor gradually into a liquid phase through heat release, An expansion valve for reducing the pressure of the liquid refrigerant to form a low temperature gas-liquid mixed refrigerant, and an evaporator for evaporating the low temperature gas-liquid mixed refrigerant to absorb ambient heat and sending the evaporated refrigerant back to the compressor Equipped.

In particular, a compressor is a device that converts mechanical energy into compressive energy of a compressive fluid, and such compressors are classified into rotary compressors, crank compressors, and linear compressors according to their shapes.

1 shows such a rotary compressor. As shown, the rotary compressor 1 is mounted to the outside of the body 10, the body 10, the upper portion is provided with a suction pipe 41 for sucking the low-temperature, low-pressure refrigerant gas supplied from the evaporator The lower part is equipped with an accumulator 40 in which a discharge tube 42 for discharging the refrigerant gas into the body is formed.

In the inner middle portion of the body 10 is provided a motor assembly 30 is mounted with a rotating shaft 32 rotatable by the electromagnetic action of the stator and the rotor 33. An eccentric portion 31 is formed at one end of the rotation shaft 32. Therefore, when the rotating shaft 32 is rotated, the eccentric portion 31 is eccentrically rotatable.

The cylinder 20 is mounted below the predetermined distance of the motor assembly 30. A motor bearing 34 is mounted on the upper surface of the cylinder 20, and a pump bearing 35 is installed on the lower surface of the cylinder 20. In addition, a predetermined space is formed therein. The eccentric portion 31 and the roller 21 of the rotating shaft 32 is integrally mounted in the space. Therefore, when the rotating shaft 32 rotates, the refrigerant gas is compressed by oil film contact between the roller 21 and the inner wall of the cylinder 20.

In addition, the body 10 is mounted on the body 17, the upper portion of the body 17, the upper cover 13, the outer terminal 11 and the discharge tube 12 is formed, and the lower portion of the body 17 It is mounted on the base plate 15 is formed with a fastening hole 14, it is composed of a lower cover 16 containing the oil required for the start of the compressor (1).

In addition, a suction port 18 through which the refrigerant gas passing through the accumulator 40 is sucked is formed at one side of the cylinder 20, and a discharge port is formed at the other side such that the refrigerant gas compressed at high temperature and high pressure is discharged by the discharge valve. The vane is installed to divide the high pressure side and the low pressure side when the roller 21 is operating.

The operation of the compressor 1 configured as described above is performed in a state in which the low-temperature low-pressure evaporated gas evaporated from the evaporator is sucked through the suction pipe 41 of the accumulator 40 to remove the liquid refrigerant and foreign matter contained in the refrigerant gas. It is sucked into the cylinder 20 through the suction port 18 connected to the discharge tube 12 of the accumulator 40.

The refrigerant gas sucked in this way is the rotational force of the motor assembly 30 is transmitted directly to the rotating shaft 32 to rotate the refrigerant gas introduced through the suction port 18 by the oil film contact between the eccentric portion 31 and the roller 21. It is compressed in the compression chamber by the rotation, and the compressed refrigerant gas is discharged to the discharge port by the action of the discharge valve.

In such a rotary compressor 1, it is necessary to form an appropriate oil film between the roller 21 and the inner wall of the cylinder 20.

However, such a rotary compressor has been supplied oil in a natural manner without mounting a separate oil supply pipe. Therefore, there is a problem that it is difficult to form an appropriate oil film.

The present invention has been made to solve the above disadvantages, an object of the present invention is to provide a rotary compressor that can be smoothly compressed by mounting an oil pipe for supplying oil between the roller and the inner wall of the cylinder.

1 is a cross-sectional view showing the configuration of a conventional rotary compressor;

Figure 2 is an assembled perspective view showing an air conditioner equipped with a rotary compressor according to an embodiment of the present invention.

3 is a cross-sectional view showing the configuration of a rotary compressor having an oil supply structure according to the present invention;

<Explanation of symbols for main parts of drawing>

300: accumulator 305: main body

310: discharge tube 307: top cover

309: Oil Tank 320: Motor Bearing

330: Roller 332: Cylinder

350: oil supply pipe 352: oil flow path

In order to achieve the above object, the present invention is equipped with an oil tank in which oil is stored in a lower part of the main body, is installed in the bottom of the main body, and has a compression chamber into which refrigerant gas is introduced. The lower portion of the rotary compressor having a motor assembly having a rotating shaft having a cylinder on which a pump bearing is mounted, an eccentric for compressing the refrigerant gas sucked into the compression chamber of the cylinder, the oil moves inside the rotating shaft The oil supply pipe is formed, and the predetermined position of the motor bearing communicates with the oil supply pipe, and an oil groove for storing oil is formed, and the oil groove is formed in the gap direction between the inner wall of the cylinder and the roller. Rotary compressor having an oil supply structure in communication with an oil channel for supplying oil Provided. The oil supply pipe is formed upward from the lower end of the rotating shaft, the lower end is immersed in the oil to a predetermined depth. The oil groove is formed in the circumferential direction on the inner circumferential surface of the motor bearing.

Hereinafter, an oil supply structure of a rotary compressor according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is an assembled perspective view showing the internal structure of an air conditioner equipped with a rotary compressor equipped with an oil supply pipe according to the present invention.

As shown, the air conditioner 200 has a main body 14 on which the base plate 5 is mounted, a front panel 13 mounted on the front of the main body 14, and an interior of the main body to perform a cooling cycle. In the compressor 1 for compressing the refrigerant gas to high temperature and high pressure, the condenser 2 for gradually condensing the high temperature and high pressure refrigerant gas from the compressor 1 into the liquid phase through heat dissipation, and A fan assembly (11) mounted on the rear side to expand air to the condenser (2), and an expansion valve (3) for lowering the pressure of the liquid refrigerant from the condenser (2) to form a low temperature gas-liquid mixed refrigerant And an evaporator 4 for evaporating the low temperature gas-liquid mixed refrigerant to absorb ambient heat and sending the evaporated refrigerant back to the compressor 1, and mounted at the rear of the evaporator 4 to supply air to the evaporator ( 4) blower 10 to be sent to the And a motor assembly 9 equipped with a rotary shaft 9a for rotating the blower 10 and the fan assembly 11.

In particular, a compressor is a device that converts mechanical energy into compressive energy of a compressive fluid, and such compressors are classified into rotary compressors, crank compressors, and linear compressors according to their shapes.

3 shows such a rotary compressor 1. As shown, the rotary compressor 1 is mounted to the outside of the body 305, the body 305, the upper portion is provided with a suction pipe 344 for sucking the low-temperature, low-pressure refrigerant gas supplied from the evaporator The lower portion is equipped with an accumulator 340 in which a discharge tube 342 for discharging the refrigerant gas to the body 305 is formed.

The body 305 is mounted on the body 308, the upper portion of the body 308, the upper cover 307, the outer terminal 306 and the discharge tube 310 is formed, and the lower portion of the body 308 The base plate 327 is formed with a fastening hole 329 is installed, it is composed of an oil tank 309 containing the oil necessary for the start of the compressor (1).

In addition, a suction port 312 is formed at one side of the cylinder 332 to suck the refrigerant gas through the accumulator 340, and the discharge port 310 is discharged to discharge the refrigerant gas compressed at a high temperature and high pressure to the discharge valve at the other side. The vane is installed to divide the high pressure side and the low pressure side when the roller 330 is operated.

The operation of the compressor 1 configured as described above is such that the low temperature low pressure evaporated gas evaporated from the evaporator is sucked through the suction pipe 344 of the accumulator 340 to remove the liquid refrigerant and foreign matter contained in the refrigerant gas. It is sucked into the cylinder 332 through the suction port 312 connected to the discharge pipe 342 of the accumulator 340.

An inner middle portion of the body 305 is provided with a motor assembly 315 equipped with a rotating shaft 317 rotatable by electromagnetic action of the stator and the rotor 319. An eccentric portion 322 is formed at one end of the rotation shaft 317. Therefore, when the rotation shaft 317 rotates, the eccentric portion 322 is eccentrically rotatable.

The rotary shaft 317 has an oil supply pipe 350 therein. The oil supply pipe 350 is formed up to a position corresponding to the motor bearing 320 upwardly at one end 351 of the rotating shaft 317, that is, the portion immersed in the oil.

The cylinder 332 is mounted below the predetermined distance of the motor assembly 315. The motor bearing 320 is mounted on the upper surface of the cylinder 332, and the pump bearing 325 is installed on the lower surface of the cylinder 332. In addition, a predetermined space is formed therein. The eccentric portion 322 and the roller 330 of the rotating shaft 317 is integrally mounted in the space. Therefore, when the rotating shaft 317 rotates, the refrigerant gas is compressed by oil film contact between the roller 330 and the inner wall of the cylinder 332.

An oil groove 358 is formed at a predetermined position of the motor bearing 320. The oil groove 358 is formed on the inner circumferential surface of the motor bearing 320, and has a circular cross section. The oil groove 358 is connected to the oil supply pipe 350. Therefore, the oil stored in the oil tank 309 is sucked through the oil supply pipe 350 and is supplied to the oil groove 358.

The oil passage 352 is formed in the body of the motor bearing 320, and the oil passage 352 communicates with the oil groove 358. Accordingly, the oil supplied to the oil groove 358 may be supplied between the inner wall of the cylinder 332 and the roller 330 through the oil passage 352.

One end 351 of the oil supply pipe 350 is immersed in the oil stored in the oil tank 309 to a predetermined depth, so when the rotary shaft 317 rotates, the oil stored in the oil tank 309 It is sucked into one end 351 of the oil supply pipe 350 and is supplied to the gap 354 between the roller 330 and the inner wall of the cylinder 332 via the oil groove 358 and the oil passage 352. do. Therefore, the roller 330 can smoothly contact the inner wall of the cylinder 332.

Hereinafter, with reference to the accompanying drawings will be described in detail the operation according to the preferred embodiment of the present invention.

Referring to FIGS. 2 and 3, the refrigerant gas, which has undergone an evaporator and is at a low temperature and low pressure, passes through a discharge port 342 through a suction pipe 344 of the accumulator 340, and a suction port of the rotary compressor 1. Inhaled at 312.

When power is applied to the motor assembly 315, the rotation shaft 317 starts to rotate due to electromagnetic interaction between the stator and the rotor 319. Therefore, the eccentric portion 322 mounted to one end of the rotation shaft 317 and rotatably mounted in the cylinder 332 starts to rotate. The roller 330 is rotated by the rotation of the eccentric portion 322. The roller 330 is integrally coupled to the eccentric portion 322, so that the eccentric rotation. Therefore, the inside of the cylinder 332 is divided into two zones of the suction and discharge zones by the roller 330.

The suction zone is at a low pressure while the roller 330 is rotating. Therefore, the oil stored in the oil tank 309 is sucked into the oil supply pipe 350, and passes between the roller 330 and the inner wall of the cylinder 332 via the oil groove 358 and the oil flow path 352. It is supplied to the gap 354 of the. Therefore, the roller 330 can smoothly contact the inner wall of the cylinder 332.

As described above, the rotary compressor according to the present invention has the advantage that the oil is smoothly supplied to the compression chamber of the cylinder through the flow path formed on the rotary shaft by the pressure difference generated during the rotation of the rotary shaft.

In the above, the present invention has been described based on preferred embodiments, but various modifications and improvements can be made within the scope of the technical idea of the present invention, and those skilled in the art can recognize that such modifications and improvements also belong to the present invention. There will be.

Claims (3)

An oil tank storing oil is mounted at the bottom of the main body, and is installed at the bottom of the main body, and has a compression chamber in which refrigerant gas is introduced therein, a motor bearing is mounted at the top thereof, and a pump bearing is mounted at the bottom thereof. A rotary compressor having a cylinder and a motor assembly having a rotating shaft having an eccentric portion formed therein for compressing refrigerant gas sucked into a compression chamber of the cylinder. An oil supply pipe for moving oil is formed inside the rotating shaft, and an oil groove for storing oil is formed in communication with the oil supply pipe at a predetermined position inside the motor bearing, and the oil groove is an inner wall of the cylinder. And an oil supply structure formed in the gap direction of the roller and communicating with an oil flow path capable of supplying oil. The rotary compressor of claim 1, wherein the oil supply pipe is upwardly formed at a lower end of the rotary shaft, and the lower end is immersed in a predetermined depth in oil. The rotary compressor of claim 1, wherein the oil groove is formed in an circumferential direction on an inner circumferential surface of the motor bearing.