JPS61190186A - Enclosed type rotary compressor - Google Patents

Abstract

PURPOSE:To feed sufficient oil into a vane groove even when an oil level is lowered by providing oil which is stored in the bottom part of an enclosed container, a vane groove which is provided on a cylinder positioned on the upper part of said oil, and a pipe for feeding said oil into said vane groove. CONSTITUTION:A pipe 17 connecting a clearance 16 at the top dead center of a vane 10 to the bottom part of an enclosed container 1, is provided on a cylinder 7. At the clearance 16, a refrigerant gas tends to flow both upward and downward from the clearance 16, but the downward flow will not take place due to large resistance, since the pipe 17 is connected to a stored oil. Accordingly, the refrigerant gas oily flows upward and, contrarily, the oil is sucked up from down below due to pumping action caused by the reciprocation of the vane 10, and fed to a sliding surface between a gate-valve groove 18 and a gate valve 10. Due to above mentioned construction, the sliding surface of the gate valve 10 can be sufficiently fed with oil even if the oil level is lowered. As a result, the wear of the gate-valve groove 18 can be reduced, while preventing lowering in the capacity of refrigeration as well as the generation of unusual sound.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a hermetic rotary compressor, and particularly to a groove suitable for supplying oil to a vane groove.

[Background of the invention]

A conventional hermetic rotary compressor will be explained with reference to FIGS. 3 and 4. A motor section λ is disposed in the upper part of the closed container 1, a main compressor section is arranged in the lower part, and a rotor 4 constituting the motor section is press-fitted into a shaft 5 constituting the main compressor section. When the rotor 4 rotates, a roller 6 rotatably fitted to an eccentric portion (not shown) of a shaft 5 rotates inside the cylinder 7.

Inside the cylinder 7, a space consisting of an upper bearing 8, a lower bearing 9, and a roller 6 is divided into a high pressure chamber 11 and a low pressure chamber 12 by vanes 10.
partitioned into Refrigerant gas enters the low pressure chamber 12 from the suction pipe 13, is compressed by the rotation of the roller 6, becomes high pressure, and is then discharged into the closed container 1, and is discharged from the discharge pipe 14 into the cycle. Refrigerating machine oil is stored at the bottom of the closed container 1 and serves as lubricating oil for the sliding parts. The gate valve 10 repeatedly moves back and forth as the row 26 rotates while being pressed by the spring 15.

In this structure, the gate valve 10 is obliquely pressed against the gate valve groove 18 of the cylinder 7 due to the pressure difference between the high pressure chamber 11 and the low pressure chamber 12, so the gate valve groove 18 is worn out, resulting in a decrease in refrigerating capacity and abnormal noise. There was a possibility of causing an outbreak. On the other hand, as disclosed in Japanese Patent Application Laid-open No. 59-17486, a method is known in which a bypass 19 is provided in the gate valve groove 18 to allow lubricating oil to pass around and press the gate valve 10 in one direction, thereby making the surface pressure uniform and reducing wear. It is being

However, in this method, when the oil level 20 reaching the vane 10 is high, lubricating oil is supplied to the bypass 19 by the reciprocating movement of the gate valve 10, but the oil level 20 decreases and the gap 21 If this exists, the lubricating oil will not flow to the bypass 19, and the vane 10 will not be able to be pushed in one direction, causing the problem that the function of reducing wear on the gate valve groove 18 will not work.

[Purpose of the invention]

An object of the present invention is to provide a structure in which vane grooves do not wear out even when the oil level decreases in a hermetic rotary compressor.

[Summary of the invention]

Wear of the vane grooves of the cylinder is controlled by three factors: surface pressure, roughness, and lubricating oil, but the vane grooves are not supplied with oil. Therefore, when the oil level is to the extent that the vane is submerged, almost no wear occurs, but when the oil level is low, the blood pressure to the vane cannot be improved by lubricating oil, and wear increases.

If the vane grooves are supplied with oil even when the liquid level drops, there will be less wear even if the surface pressure is high due to the formation of an oil film.

The present invention solves the problem by devising a structure that actively refuels.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG. 1.2.

A motor section is disposed in the upper part of the closed container 1, a compressor main section is disposed in the lower part, and a rotor 4 constituting the motor section.
is press-fitted into a shaft '5 constituting the compressor unit, and when the rotor 4 rotates, a roller 6 rotatably fitted to an eccentric portion (not shown) of the shaft 5 rotates inside the cylinder 7. . Inside the cylinder 7, a space consisting of an upper bearing 8, a lower bearing 9, and a roller 6 is divided into a high pressure chamber 11 and a low pressure chamber 12 by vanes 10. Refrigerant gas enters the low pressure chamber 12 from the suction pipe 13, is compressed by the rotation of the roller 6, becomes high pressure, and is then discharged into the closed container 1, and is discharged from the discharge pipe 14 into the cycle. Refrigerating machine oil is stored at the bottom of the closed container 1 and serves as lubricating oil for the sliding parts.

Since the vane 10 is not pressed by the spring 15, the roller 6
It repeats reciprocating motion as it rotates.

Clearance 16 at top dead center of vane 10 and closed container 1
A pipe 17 connecting the bottom of the cylinder 7 is provided in the cylinder 7. The reciprocating motion of the plate 710 in the clearance 16 attempts to cause a flow of refrigerant gas above and below the clearance 16, but since the pipe 17 is connected to the oil stored below, there is a large resistance and no flow occurs. . Therefore, the refrigerant gas only flows upward, and conversely, oil is sucked up from below by the pump action of the reciprocating motion of the vanes 10. The sucked up oil is supplied to the sliding surface between the gate valve groove 18 and the gate valve 10 by the reciprocating movement of the gate valve 10. With this structure, the sliding surface of the gate valve 10 is amply lubricated not only when the oil level is normal but also when the oil level is low.

〔Effect of the invention〕

According to the present invention, even if the stored oil level decreases, sufficient oil can be supplied between the gate valve 10 and the gate valve groove 18, so that wear of the gate valve groove 18 can be reduced. This has the effect of preventing a decline in refrigeration capacity and the occurrence of abnormal noises.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of a vertical hermetic rotary compressor according to an embodiment of the invention, Fig. 2 is an enlarged plan view of the vane portion of Fig. 1, and Fig. 3 is a conventional vertical hermetic rotary compressor. A vertical sectional view of the machine, and FIG. 4 is an enlarged plan view of the vane portion of FIG. 3. DESCRIPTION OF SYMBOLS 1... Airtight container, S... Electric motor part, J... Compressor part, 4... Rotor, 5... Shaft, 6... Roller,
7... Cylinder, 8... Upper bearing, 9... Lower bearing, 10... Vane, 11... High pressure chamber, 12...
Low pressure chamber, 13... Suction pipe, 14... Discharge pipe, 15.
...Spring, 16...Clearance, 17...
Pipe, 18... Vane groove, 19... Bypass, 2
0... Oil level, 21... Gap.

Claims (1)

[Claims] A closed type, characterized by comprising oil stored at the bottom of a closed container, a cylinder located above the oil, a vane groove provided in the cylinder, and a pipe for supplying the oil into the vane groove. Rotary compressor.