JPH04308389A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce sliding loss and improve reliability on seizure and the like by performing sufficient oiling between an inner roller and an outer roller, and improve the efficiency of a compressor by reducing lubricating oil with refrigerant, leaked into a compression chamber through the end faces of the inner and outer rollers, melted therein. CONSTITUTION:A mechanical body 9 and a motor part 2 are disposed, and there are provided a shaft 3 for transmitting torque from the motor part 2, a crank 3c decentered at a part of the shaft 3, an inner roller 21 interposed at the crank 3 and provided with a radial through hole, and an outer roller 22 fitted to the inner roller 21 and provided with ring cutouts at the inner peripheral parts of both end faces thereof. Ring sealants 24a, 24b are disposed in the ring cutouts of the outer roller 22.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary compressor used in a refrigeration cycle or the like, and particularly relates to improving efficiency by reducing wetting loss and sliding loss.

0002

2. Description of the Related Art A conventional configuration will be explained with reference to FIGS. 3 and 4. In FIG. 4, 1 is a sealed casing, 2 is an electric motor section, and a cylinder 4 and an inner roller 5 are connected via a shaft 3.
a, an outer roller 5b, a vane 6, a main bearing 7, and a sub-bearing 8. The shaft 3 consists of a main shaft 3a, a sub-shaft 3b, and a crank 3c. 10
is a spring installed on the back of the vane. Reference numeral 11 denotes a compression chamber within the cylinder 4, which is constituted by a first roller 5a, a second roller 5b, a vane 6, a main bearing 7, and a sub-bearing 8. 12 is an oil supply mechanism connected to the shaft 3. 13
is a suction pipe fixed to the sub-bearing 8, and communicates with the compression chamber 11 via a suction passage 14a of the sub-bearing 8 and a suction passage 14b of the cylinder 4. 15 is a discharge hole and discharge valve 1
It communicates with the inside of the sealed casing 1 via 6. Reference numeral 17 denotes a discharge pipe that opens into the sealed casing 1. 18
is a lubricant.

[0003] The electric motor section 2 also has a rotor 2a and a stator 2b.
The rotor 2a includes a balance weight 2c,
2d is fixed.

Refrigerant gas from a cooling system (not shown) is guided through a suction pipe 13 and suction passages 14a, 14b to reach a compression chamber 11 within the cylinder 4. The refrigerant gas that has reached the compression chamber 11 is partitioned by the roller 5 and the vane 6 fitted to the crank 3c of the shaft 3, and is compressed by the shaft 3, the first roller 5a, and the first roller 5a as the electric motor section 2 rotates. 2
It is gradually compressed by the rotational movement of the roller 5b. Therefore, during compression, a high pressure chamber 11a and a low pressure chamber 11b exist.

The compressed refrigerant gas is delivered to the sealed casing 1 through a discharge hole 15 and a discharge valve 16 provided in the sub-bearing 8.
After being once discharged into the interior, it is discharged through the discharge pipe 17 to the cooling system. Further, the lubricating oil 18 is supplied by the oil supply mechanism 12 to the shaft 3 and sliding parts such as the main bearing 7 and the sub-bearing 8 .

[0006]

However, in the above structure, the vane 6 presses the first roller 5a toward the opposite side of the vane due to gas pressure acting on the back surface of the vane 6, and furthermore, the second roller 5b also presses against the opposite side of the vane. It is pressed against the vane side. Therefore, the gap between the inner diameter of the first roller 5a and the outer diameter of the second roller 5b is concentrated on the side opposite to the vane, and the first
There was a problem in that the high-pressure lubricating oil supplied to the inner circumference of the roller 5a leaked into the low-pressure chamber and the high-pressure chamber, reducing the efficiency of the compressor. In addition, since the sliding portion between the outer circumferential portion of the first roller 5a and the inner circumferential portion of the second roller 5b is not lubricated by differential pressure, etc., the efficiency of the compressor decreases due to increased sliding loss, and , there were reliability problems such as seizure of the second roller.

The present invention solves the above-mentioned problems, and has a simple structure that prevents leakage of lubricating oil flowing into the high pressure chamber and low pressure chamber in the compression chamber through both end surfaces of the first roller and the second roller. In addition, the purpose is to reduce the sliding loss between the first roller and the second roller, and to prevent the roller from seizing.

[0008]

[Means for Solving the Problems] The present invention provides an inner roller which is interposed in the crank of a shaft and has a hole passing through it in the radial direction, and an annular notch which is fitted to the inner roller and is formed on the inner periphery of both end surfaces. An annular sealing material is provided in an annular cutout of the outer roller.

[0009]

[Operation] With the above-described structure, the present invention allows the lubricating oil supplied to the inner circumference of the inner roller to reach the sliding portion between the outer circumference of the inner roller and the inner circumference of the outer roller through the holes provided in the radial direction. In addition to being constantly supplied, leakage to the high-pressure chamber and low-pressure chamber during compression via both end surfaces of the outer roller is reduced, improving the efficiency of the compressor and preventing seizure of the inner and outer rollers.

0010

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. Incidentally, the same parts as in the conventional example are given the same reference numerals, and the description thereof will be omitted.

Reference numeral 21 indicates an inner roller rotatably interposed in the crank 3c of the shaft 3, and 22 indicates an inner roller 2.
1 is an outer roller rotatably fitted to the outer roller. 23 is a hole passing through the inner roller 21 in the radial direction. 22a,
22b is an annular notch provided on the outer periphery of the end surface 22c of the outer roller 22.

Further, 24a and 24b are annular sealing members, which are disposed within the annular notches 22a and 22b of the outer roller 22.

In the above structure, the inner circumferential portion 21a of the inner roller 21 is under high pressure, which is higher than the pressure in the compression chamber 11, so the pressure difference causes the both end surfaces 21 of the inner roller 21 to
b is refueled. In addition, the inner roller 21 and the outer roller 22
At a point 25 between the inner roller 21 and the inner roller 21, the pressure is lower than the high pressure at the inner circumferential portion of the inner roller 21 because the pressure is reduced while the oil flows from the inner circumferential portion 21a to the end surface 21b of the inner roller 21. Therefore, this differential pressure causes oil to be supplied to the gap between the inner roller 21 and the outer roller 22 via the radial holes 23. As the inner roller 21 rotates, the entire sliding portion 26 of the inner roller 21 and the outer roller 22 is lubricated, thereby reducing sliding loss, improving the efficiency of the compressor, and preventing seizure. .

Furthermore, the lubricating oil 18 supplied to the inner peripheral portion 21a of the inner roller 21 is supplied to the inner roller 21 through the hole 23.
and the outer roller 22 . Then, the vane 6 is pushed by the inner roller 21 toward the opposite side of the vane due to the gas pressure acting on the back surface of the vane 6, and the outer roller is further pushed toward the opposite side from the vane, so as to come into contact with the crank 3c. Therefore, the gap between the inner and outer diameters of the inner roller 21 and the outer roller 22 is concentrated on the side opposite to the vane.

However, by disposing the sealing materials 24a and 24b on the end faces of the outer roller 22, the lubricating oil 18 sufficiently supplied to the sliding portion 26 between the inner roller 21 and the outer roller 22 is transferred to the outer roller 22. There is no leakage into the compression chamber 11 via the end face 22c.

Furthermore, the annular sealing members 24a and 24b allow the lubricating oil 18 supplied to the inner circumferential portion 21a of the inner roller 21 to pass through the end surface 21b of the inner roller 21 to the high pressure chamber 11a and the low pressure chamber 11b, which are in the process of being compressed. Leakage can also be reduced.

[0017]

As is clear from the above description, the present invention has a main body of a mechanical part and an electric motor part, a shaft for transmitting rotational force from the electric motor part, and an eccentric crank attached to a part of the shaft. an inner roller that is interposed in the crank and has a hole passing through it in the radial direction; and an outer roller that is fitted with the inner roller and has annular notches on the inner periphery of both end surfaces; Since the annular seal material is placed in the annular notch of the outer roller, sufficient oil can be supplied between the inner roller and the outer roller, resulting in reduced sliding loss and improved compressor efficiency. In addition to improving the performance, burn-in can also be prevented.

Furthermore, the amount of lubricating oil 18 leaking into the compression chamber through both end surfaces of the inner and outer rollers can be reduced, thereby improving the efficiency of the compressor.

[Brief explanation of drawings]

[Fig. 1] An enlarged cross-sectional view of main parts of a rotary compressor showing an embodiment of the present invention.

[Fig. 2] A vertical cross-sectional view of a rotary compressor showing an embodiment of the present invention.

[Figure 3] Longitudinal cross-sectional view of a conventional rotary compressor

[Fig. 4] Cross-sectional view taken along line I to I' in Fig. 3

[Explanation of symbols]

2　　　Electric motor part 3 Shaft 3C crank 6 Vane 9 Mechanical body 21 Inner roller 22 Outer roller 22a, 22b Notch 23 holes 24a, 24b Seal material

Claims (1)

[Claims] Claim 1: A mechanical part main body and an electric motor part are disposed, a shaft transmits rotational force from the electric motor part, a crank eccentric to a part of the shaft, and a shaft inserted in the crank and penetrating in the radial direction. an inner roller having a hole formed therein; and an outer roller fitted with the inner roller and having an annular notch on the inner periphery of both end surfaces, and an annular seal provided in the annular notch of the outer roller. A rotary compressor characterized by the fact that it is equipped with a material.