KR0118462B1 - Rotary compressor - Google Patents

Abstract

a driver for rotating a shaft; a compression part comprised of a cylinder positioned on the bottom of the driver to suck and discharge refrigerant gas, main bearing and sub-bearing assembled on the top and bottom of the cylinder to support the shaft, an eccentric wheel fixed as a unitary body with the bottom end of the shaft and rotated eccentrically within the cylinder, a roller inserted into the eccentric wheel to revolve and rotate along the inner peripheral surface of the cylinder, and a vane elastically protruded along the outer peripheral surface of the roller to form a high pressure room and a low pressure room; and an oil feed part for feeding oil to reduce a friction force of the compression part for smooth rotation. In the construction of the rotary compressor, the thickness of the lower end of the roller is designed to be reduced to reduce the friction area of the roller against the sub-bearing and to smoothly feed the oil.

Description

Rotary compressor

1 is a longitudinal sectional view showing the structure of a compressor.

2 is an enlarged cross-sectional view taken from a conventional compression unit.

3 is a plan cross-sectional view of FIG.

4 is a cross-sectional view of a conventional roller.

5 is a cross-sectional view of the roller of the present invention.

6 is a cross-sectional view showing another embodiment of the roller of the present invention.

7 is a cross-sectional view of the compression unit in the assembled state of the present invention.

* Explanation of symbols for main parts of the drawings

10: compression body 21: stator

22: rotor 23: shaft

31: Cylinder 32: Main bearing

33: Sub bearing 34: Eccentric ring

35: Roller 35a: Lower part

36: vane 41: oil supply

42: branch hole 311: suction port

312: discharge port 313: high pressure chamber

314: low pressure chamber δ ₁ , δ ₂ : upper, lower clearance

t: thickness

The present invention relates to a rotary compressor, and in particular, to improve the structure of the roller for compressing and discharging the refrigerant gas while rotating and revolving, thereby reducing the friction area by reducing the friction area and smooth lubrication, and the clearer due to the lubrication film is formed in parallel. It relates to a rotary compressor invented to improve the volumetric efficiency by reducing the amount of refrigerant leakage.

Conventional rotary compressors, as shown in Figures 1 to 4, the drive unit is installed in the compressor main body 10 and rotated by the supply of power; the accumulator 50 is driven and driven by the drive unit to suck and discharge the refrigerant gas Compression unit for compressing to make; Consists of the lubrication unit for lubricating oil to reduce the frictional force of the compression unit to smooth rotation.

The drive unit includes a stator 21 fixed to the compressor main body 10 to receive power, and a rotor 22 fixedly installed to integrally install the shaft 23 to rotate by the stator 21.

The compression unit is positioned below the driving unit, and is assembled to the cylinder 31 for sucking and discharging the refrigerant gas into the suction port 311 and the exposure port 312, and the upper and lower portions of the cylinder 31 to form the shaft 23. On the main bearing 32 and the sub bearing 33 to support, the eccentric wheel 34 and the eccentric wheel 34 which are fixedly installed at the lower end of the shaft 23 and rotate eccentrically in the cylinder 31. Roller 35 which is inserted and rotates and revolves along the inner circumferential surface of the cylinder 31, and is mounted elastically along the outer circumferential surface of the roller 35 which is installed on the cylinder 31 and rotates and rotates by the resilient means 37. And the vanes 36 forming the high pressure chamber 313 and the low pressure chamber 314.

The oil supply part is axially drilled through the shaft 23 to supply oil with oil supply hole 41, and the oil supply hole 41 communicates with the eccentric wheel 34 and the roller 35 to supply oil to the upper and lower clearances ( It consists of the branch hole 42 branched between (delta) ₁ and (delta) ₂ and the roller 35.

The compressor, the stator 21 is rotated by the power supply of the rotor 22, the shaft 23 is also rotated at the same time as the rotation of the stator 21, and fixed to the lower end of the shaft 23 eccentrically The installed eccentric wheel 34 is a revolving revolution, the roller 35 is integrally fitted to the outer peripheral surface by the revolving revolution of the eccentric ring 34 is to rotate and revolve along the inner circumferential surface of the cylinder (31).

At this time, the high pressure and the low pressure are generated in the cylinder 31 by the vane 36 elastically retracted by the outer circumferential surface of the roller 35 which rotates and processes. That is, since the inside of the cylinder 31 is divided into the high pressure chamber 313 and the low pressure chamber 314 by the vane 36, the high pressure and the low pressure act when the roller 35 revolves, respectively. The refrigerant gas is sucked into the low pressure chamber 314 through the suction port 311 on the side, and discharged to the discharge port 312 side of the high pressure chamber 313.

By the way, the roller 35 is located between the main bearing 32 and the sub-bearing 33 is installed in the upper, lower portion is to be moved downward by its own weight.

Therefore, the roller 35 rotates in a state where the upper clearance δ ₁ between the main bearing 32 and the roller 35 is larger than the lower clearance δ ₂ between the sub bearing 33 and the roller 35. Therefore, the frictional force increases between the sub-bearings 33 of the roller 35.

In addition, the oil supplied through the branch hole 42 branched from the oil lubrication hole 41 is difficult to flow into the lower clearance δ ₂ between the sub-bearing 33 and the roller 35 so that the lower clearance δ ₂ ) to be lubricated to failure because the oil film is not formed, phase, due to the imbalance of the lower clearance (δ ₁₎ (δ ₂₎ is the refrigerant gas leaking to the upper side clearance (δ ₁₎ that caused that the cooling capacity is reduced will be.

That is, the calculation formula for the refrigerant gas leakage amount is as follows.

Assuming δ = δ ₁ + δ ₂ = 15 μm, δ ₁ = 3 μm, δ ₂ = 12 μm,

Therefore, the ratio of the leakage mass is qm '/ qm = 0.48, so that the refrigerant through the upper and lower clearances δ ₁ and δ ₂ between the main bearing 32, the sub bearing 33, and the roller 35 angles. It can be seen that the gas leakage is significantly reduced to improve the cooling power.

Thus, the main bearing 32 and sub-bearing 33, a roller 35 a between each of the lower clearance (δ ₁₎ (δ ₂₎ the upper clearance lower clearance than if equilibrated (δ ₁ δ ₂₎ and In case of inequality, oil cannot be smoothly supplied to the lower clearance δ ₂ between the sub-bearing 33 and the roller 35, and as a result, friction loss increases due to an increase in frictional force, and furthermore, contact of the rollers. As the area is large, the friction loss is further increased, and there is a problem that the coolant gas is leaked to the upper clearance side due to an unbalance of the upper and lower clearances, which causes a decrease in cold power.

The present invention is to solve such a conventional problem, to improve the structure of the roller for the purpose of the present invention, first, to reduce the friction loss by reducing the contact area, and second, to reduce the friction loss by smooth oil supply, and third The oil film is largely formed in the clearance between the sub-bearing and the roller, so that the upper and lower clearances are almost equally balanced, so the amount of refrigerant gas leaking into the upper clearance is significantly reduced and the cooling power is improved to increase the volumetric efficiency. have.

In order to improve the object of the present invention, it is made by reducing the area of friction with the sub-bearing by reducing the thickness of the contact portion by cutting the lower end of the inner peripheral surface of the roller.

The cutting portion of the lower end of the inner circumferential surface of the roller is formed as an end or inclined surface to minimize the area equal to the sub-bearing.

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

1 to 3, the rotary compressor is fixed to the compressor main body 10 to be supplied with power and the stator 21 and the shaft 23 are integrally fixed and rotated by the stator 21. A driving unit configured to rotate by supply of power; a cylinder 31 positioned below the driving unit to suck and discharge refrigerant gas into the suction port 311 and the discharge port 312, and the cylinder. Main bearings 32 and sub-bearings 33 which are assembled to the upper and lower portions of the 31 to support the shaft 23, and fixedly installed at the lower end of the shaft 23 so as to be eccentric in the cylinder 31. The rotating eccentric ring 34, the roller 35 which is fitted to the eccentric ring 34 and rotates and revolves along the inner circumferential surface of the cylinder 31, and is provided on the cylinder 31 by the elastic means 37. The high pressure chamber 313 and the low pressure chamber 314 are elastically indented along the outer circumferential surface of the roller 35 rotating and rotating. A compression unit configured to include a vane 36 to be compressed to suck and discharge the refrigerant gas of the accumulator 50 by driving the drive unit; an axial hole drilled in the shaft 23 to supply oil Branch hole which is in communication with the oil hole 41, the oil supply hole 41 and lubricated between the eccentric ring 34 and the goller 35 and branched between the upper and lower clearances (δ ₁ ) (δ ₂ ) and the roller 35 ( 42), the compression section is configured as the oil supply section for lubricating oil to reduce the friction force to the desired rotation is the same as the conventional.

However, the present invention is characterized in that the thickness t of the lower end 35a of the roller 35 is reduced in order to reduce the friction area with the sub-bearing 33 and smoothly supply oil.

The lower end portion 35a of the roller 35 is formed as an end portion on the inner circumferential surface as shown in FIG. 5 or as an inclined surface as shown in FIG. 6 to minimize the friction area with the sub-bearing 33. .

Referring to the effects of the present invention configured as described above in detail.

In this compressor, the stator 21 is rotated by the power supply of the rotor 22, and the shaft 23 is simultaneously rotated according to the rotation of the stator 21, and is fixedly installed at the lower end of the shaft 23. The eccentric ring 34 is rotated, the eccentric ring 34 is also rotated at the same time, the eccentric ring 34 is fixedly eccentrically fixed to the lower end of the shaft 23 is rotated, the eccentric ring 34 The roller 35, which is integrally fitted to the outer circumferential surface by rotating, rotates and revolves along the inner circumferential surface of the cylinder 31.

At this time, the high pressure and the low pressure are generated in the cylinder 31 by the vane 36 which is elastically driven by the outer circumferential surface of the roller 35 which rotates and revolves. That is, since the inside of the cylinder 31 is divided into the high pressure chamber 313 and the low pressure chamber 314 by the vane 36, the high pressure and the low pressure act when the roller 35 revolves, respectively. The refrigerant gas is sucked into the low pressure chamber 314 through the suction port 311 on the side, and discharged to the discharge port 312 side of the high pressure chamber 313.

At this time, the lower end 35a of the roller 35 is in contact with the sub-bearing 33 to rotate and revolve, and the lower end 35a reduces its frictional area by reducing its thickness t to minimize frictional force. This reduces the friction loss significantly.

Further, the lower end portion 35a of the roller 35 is formed as an end portion on the inner circumferential surface as shown in FIG. 5 or as an inclined surface as shown in FIG. 6 so as to form a larger inner circumferential surface. The oil lubricated through the branch hole 42 is naturally guided to the lower end portion 35a to flow into the lower clearance δ ₂ between the roller 35 and the sub bearing 33.

Therefore, as shown in FIG. 7, since an oil film naturally forms due to the inflow of oil into the lower clearance δ ₂ between the roller 35 and the sub bearing 33, the upper clearance δ between the roller 35 and the main bearing 32 is obtained. ₁ ) and the lower clearance (δ ₂ ) is almost equal to the equilibrium to reduce the amount of refrigerant gas leaking into the upper clearance (δ ₁ ) to improve the cooling power and increase the volumetric efficiency.

Thus, the present invention improves the structure of the roller, first, to reduce the friction loss by reducing the contact area, second, to reduce the friction loss by lubricating smooth oil, and third, the oil film is largely formed in the clearance between the sub-bearing and the roller Since the upper and lower clearances are almost equally balanced, the amount of refrigerant gas leaking into the upper clearances is significantly reduced, thereby improving the cooling power and increasing the volumetric efficiency.

Claims (3)

A drive unit for rotating the shaft; a cylinder positioned below the drive unit for sucking and discharging refrigerant gas, a main bearing and a sub bearing assembled to the upper and lower parts of the cylinder to support the shaft, and fixedly fixedly installed at the lower end of the shaft. Eccentric wheel that rotates eccentrically in the cylinder, and roller that rotates and revolves along the inner circumferential surface of the cylinder, and is spun elastically along the outer circumferential surface of the roller installed and revolved in the cylinder, so that the high pressure chamber and the low pressure A compression unit comprising a vane forming a seal, and a rotary compressor consisting of an oil supply part for lubricating oil to smoothly rotate by reducing the frictional force of the compression part, the roller compressor being used to reduce the friction area with the sub bearing and to smoothly supply oil. Rotary compressors characterized by reducing the thickness of the lower end. The rotary compressor of claim 1, wherein the lower end of the roller is formed as an end on an inner circumferential surface thereof. The rotary compressor of claim 1, wherein the lower end of the roller is formed on an inner circumferential surface as an inclined surface.