JPH04228894A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce leakage of a refrigerant flowing from the tip end of a vane for defining a high pressure chamber and a low pressure chamber and a sliding portion of a roller so as to enhance reliability of the sliding portion. CONSTITUTION:There are provided a vane 6 having an arcuate tip end of an arcuate angle in excess of 180 deg., an arcuate notch 20 of an arcuate angle in excess of 180 deg. at a curvature equal to or larger than that of the tip end of the vane 6 on the outer peripheral portion 5a of a roller 5, and an oil supplying passage 21, one end of which is opened to the notch 20 while the other end of which is opened to the inner circumferential portion 5a of the roller 5, wherein the tip end of the vane 6 is rotatably engaged with the notch 20 of the roller 5.

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 leakage loss.

0002

2. Description of the Related Art A conventional configuration will be explained with reference to FIGS. 4 and 5. In FIGS. 4 and 5, 1 is a sealed casing, and 2 is an electric motor section, which is connected via a shaft 3 to a mechanical section main body 9 consisting of a cylinder 4, a roller 5, a vane 6, a main bearing 7, and a sub-bearing 8. are doing. The shaft 3 consists of a main shaft 3a, a sub-shaft 3b, and a crank 3c. 10 is a spring provided on the back side of the vane.

Reference numeral 11 denotes a compression chamber within the cylinder 4, which is constituted by a roller 5, a vane 6, a main bearing 7, and a sub-bearing 8. 12 is an oil supply mechanism connected to the shaft 3. A suction pipe 13 is 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.

Reference numeral 15 denotes a discharge hole, which communicates with the inside of the sealed casing 1 via a discharge valve 16. Reference numeral 17 denotes a discharge pipe that opens into the sealed casing 1. 18 is lubricating oil.

[0005] The electric motor section 2 also includes a rotor 2a and a stator 2.
b, and the rotor 2a has a balance weight 2c.
, 2d are fixed.

Refrigerant gas from a cooling system (not shown) is guided through a suction pipe 13 and suction passages 14a and 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. It is gradually compressed. 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 sliding parts such as the shaft 3, the rollers 5, the main bearing 7, and the sub-bearing 8. Such a conventional example is, for example, Japanese Patent Application Laid-open No. 61
-106992.

[0008]

[Problems to be Solved by the Invention] However, in the above configuration, when the roller gradually performs compression while rolling in the compression chamber, the tip of the pirn that partitions the high pressure chamber and the low pressure chamber in the compression chamber and the roller may come into contact with each other. This sliding part is lubricated and sealed with lubricating oil, but this seal is a line seal in the axial direction, which increases the pressure difference between the high pressure chamber and the low pressure chamber, causes the roller to rotate, and prevents the roller from rotating. The seal between the roller and the vane is likely to be broken due to the processing accuracy of the vane and the like, resulting in the problem that refrigerant leaks from the high pressure chamber to the low pressure chamber, reducing the efficiency of the compressor.

Furthermore, since the seal is a wire seal, there is a reliability problem in that the tip of the vane and the sliding portion of the roller are worn out.

The present invention solves the above-mentioned problems, and has a simple structure that reduces leakage at the sliding portion between the vane tip and the roller, improves the efficiency of the compressor, and improves the sliding portion between the vane tip and the roller. The purpose of this is to improve the reliability of the

[0011]

[Means for Solving the Problems] The present invention provides a vane with an arcuate tip and an arc angle exceeding 180°, and a vane that is interposed in the crank of a shaft and has an arcuate angle on the outer periphery with a curvature equal to or greater than that of the tip of the vane. an arcuate notch portion whose angle exceeds 180°;
One end is provided with an oil supply passage which is opened in a notch and the other end is opened in the inner circumference of the roller, and the tip of the vane and the notch of the roller are rotatably fitted.

0012

[Operation] According to the present invention, the vane tip and the arc-shaped portion of the roller fit together, and compression operation is always performed in a state where sufficient oil is supplied to the fitted sliding portion. As a result, the sealing distance between the vane tip and the sliding part of the roller becomes longer, and the longer sealing part is supplied with sufficient oil, so the amount of refrigerant flowing from the high pressure chamber to the low pressure chamber is reduced, and the vane tip This also improves the reliability of the sliding parts of the rollers.

[0013]

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3. In addition, the same parts as the conventional example are given the same symbols,
The explanation will be omitted.

6a is the tip of the vane 6 having a circular arc shape exceeding 180°, and 5 is a roller rotatably interposed in the crank 3c of the shaft 3, and a roller 6a on the outer periphery is equivalent to the tip 6a of the vane 6. An arcuate notch 20 having a curvature of more than 180° is provided and fits into the vane tip 6a.

Reference numeral 21 denotes an oil supply passage, one end of which opens in the notch 20, and the other end opens in the inner peripheral portion 5a of the roller 5.

In the above structure, the tip 6a of the vane 6 and the roller 5 that partition the high pressure chamber 11a and the low pressure chamber 11b
In the sliding part of the roller 5, the sealing distance is longer than that of a conventional line seal, and the lubricating oil 18 supplied to the inner peripheral part 5a of the roller 5 is supplied through the oil supply passage 21 to provide sufficient oil for sealing. By doing so, leakage of refrigerant from the high pressure chamber 11a to the low pressure chamber 11b can be reduced, and the reliability of the sliding portion between the tip 6a of the vane 6 and the roller 5 can also be improved.

Furthermore, by making the arc-shaped notch 20 of the roller 5 and the arc-shaped tip 6a of the vane 6 both have an arc shape exceeding 180 degrees, the arc-shaped portion 6a of the vane tip and the circle of the roller 5 are formed. When the arcuate notch 20 is activated,
The fitted state can be maintained at all times, regardless of normal operation.

Furthermore, the arcuate notch 20 of the roller 5 has a curvature equal to or greater than the curvature of the tip arc 6a of the vane 6, and an oil supply passage 21 is provided between the arcuate notch 20 and the sliding portion of the tip 6a of the vane 6. By introducing high pressure lubricating oil 18 through
It can be effectively used as pressure acting on the tip of the vane to counter the back pressure of the vane 6. According to experiments conducted by the present inventor, it has been found that when the thickness of the vane 6 is 3 mm and the curvature is 3 mm, the best curvature of the cutout portion 20 of the roller 5 is 3 to 5 mm.

[0019]

Effects of the Invention As is clear from the above description, the present invention has a main body of a mechanical part and a motor part, a shaft for transmitting rotation from the motor part, and an eccentric crank provided in a part of the shaft. , a vane with an arcuate tip and an arc angle exceeding 180°, a roller interposed in the crank, and a vane with an arc angle of 180° on the outer periphery of the roller and with a curvature equal to or greater than the tip of the vane.
It is equipped with an arc-shaped notch exceeding 0° and an oil supply passage with one end opening in the notch and the other end opening in the inner circumference of the roller, so that the tip of the vane and the notch of the roller are connected to each other. Because they are rotatably fitted, the leakage of refrigerant from the high-pressure chamber to the low-pressure chamber through the sliding part between the vane tip and roller can be reduced, improving compressor efficiency, and the vane tip and roller are The reliability of the sliding parts is also improved.

[Brief explanation of the drawing]

[Fig. 1] A vertical cross-sectional view of a rotary compressor showing one embodiment of the present invention.

[Figure 2] Cross-sectional view taken along line I-I' in Figure 1

[Figure 3] Enlarged view of part A in Figure 2

[Figure 4] Longitudinal cross-sectional view of a conventional rotary compressor

[Fig. 5] Cross-sectional view taken along line II-II' in Fig. 4

[Explanation of symbols]

2　　　　　Electric motor part 3 Shaft 3a Crank 5 Roller 5a　　　Roller inner circumference 6 Vane 9 Mechanical body 20 Notch part 21　　　　Refueling passage

Claims (1)

[Claims] Claim 1: A shaft on which a mechanical part main body and an electric motor part are disposed, a shaft for transmitting rotational force from the electric motor part, an eccentric crank provided on a part of the shaft, and a tip having an arc shape and an arc angle of 180 degrees. a vane exceeding 180°; a roller interposed in the crank; an arcuate notch on the outer periphery of the roller having a curvature equal to or greater than the tip of the vane and an arc angle exceeding 180°; an oil supply passage having a hole in an arc-shaped notch and the other end opening in the inner circumference of the roller;
A rotary compressor in which a tip of the vane and the notch of the roller are rotatably fitted.