JPS6329093A - Rotary compressor - Google Patents

Abstract

PURPOSE:To reduce the friction loss of sliding parts by forming a lubrication hole communicating with sliding parts of an eccentric shaft and of a rolling piston or the like, and lightly pressing a cover onto the end face of a side housing tightly clamped on a cylinder side opposite to a motor. CONSTITUTION:The rotation of an eccentric shaft 1 makes a rolling piston 3 roll along the inner wall of a compression space 4, and compress and discharge intake gas through a partition plate 5 energized by a spring 12. In this case, since a space 11 formed of an eccentric shaft 1 borne through side housings 6a, 6b and the rolling piston 3 is kept at a medium degree between low pressure and high one, lubricating oil is drawn through a lubrication hole 7 communicating with the space 11, and supplied to sliding parts, but a cover 13 lightly pressed onto the side housing 6b prevents high pressure gas from flowing into said space 11 through a clearance between the eccentric shaft 1 and the side housing 6b. An oil supply can be therefore kept constant to improve the sealing of the lubricating oil against refrigerant and reduce the friction loss of sliding parts.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary compressor used in refrigerators, near conditioners, and the like.

BACKGROUND OF THE INVENTION In recent years, rotary compressors have become established in the industry, and their production numbers are rapidly increasing.

An example of the conventional technology is shown below with reference to the drawings.
This will be explained using No. 8-107990. FIG. 2 shows a cross section of a conventional rotary compressor.

1 is an eccentric shaft driven by an electric motor, 2 is this eccentric shaft 1
The cylinder 3, which forms a compression chamber 4 concentrically with the rotation center of the cylinder 3, is fitted onto the eccentric shaft and eccentrically rotated along the inner wall of the cylinder 2.
It is a rotating rolling piston. 6 is a vane that partitions the compression chamber 4 into a high pressure chamber and a low pressure chamber, and is in contact with the rolling piston 3. 6a is the side housing A that is in close contact with the cylinder 2, and sb is the side housing B that is in close contact with the cylinder 2.
This is an oil hole vertically provided in the site housing Eeb so as to communicate with the sliding portion of the eccentric shaft 1. Reference numeral 8 denotes a closed shell for housing the compressor main body, which is a horizontally elongated cylinder and has an end shell 8' attached to its end surface.

Reference numeral 9 denotes lubricating oil stored in the inner bottom of the shell 8, and the oil level is adjusted to be above the suction port 10 of the oil container 7. 11 is a chamber formed by the eccentric shaft 1, the rolling piston 3, etc.

Reference numeral 12 denotes a spring that presses the base 75 against the rolling piston 3.

The operation of the rotary expansion-compressor oil supply system configured as above will be described below.

First, when the eccentric shaft 1 is rotated, the rolling piston 3 rolls along the inner wall of the compression chamber 4, and the gas in the compression chamber is compressed and guided to the space inside the shell, and the inside of the shell is filled with high-pressure gas. be done. Then, it is discharged to the outside via a discharge pipe (not shown). On the other hand, low pressure gas is led directly into the compression chamber 4 from outside the shell. At this time, the chamber 11 formed by the eccentric shaft 1 and the rolling piston 3 has a pressure between high pressure and low pressure, so a pressure difference occurs between the high pressure shell and the intermediate pressure chamber 11. Lubricating oil is sucked from the oil well 7 leading to the sliding part and supplied to the sliding part.

However, in the above configuration, high-pressure gas flows into the shell (through the gap between the eccentric shaft 1 and the side housing Beb), so the amount of lubricating oil supplied is not constant, resulting in poor performance. However, the problem was that the efficiency was not stable.

In view of the above problems, the present invention provides a rotary expansion and compressor in which the amount of lubricating oil supplied is constant and performance and efficiency are stable.

Means for Solving the Problems In order to solve the above problems, the rotary expansion-compressor of the present invention has a structure in which a lid body is lightly press-fitted into the end face of the side housing B.

Effects The present invention uses the above-described configuration to prevent high-pressure gas from flowing into the gap between the eccentric shaft and the side housing B, thereby keeping the amount of oil supplied constant and stabilizing the performance and efficiency of the rotary expansion-compressor. Become.

EXAMPLE A rotary expansion compressor according to an example of the present invention will be described below with reference to the drawings.

FIG. 1 shows a cross section of a rotary expansion compressor according to an embodiment of the present invention. Note that the same parts as those in the prior art described above are designated by the same numbers and detailed explanations will be omitted.

In the figure, reference numeral 13 denotes a lid body lightly press-fitted into the end face of the side housing B, which completely seals the eccentric shaft 1 and the end face of the side housing B.

Next, regarding the rotary expansion compressor configured as above,
The operation will be explained below using FIG.

The lid body 13 lightly press-fitted into the side housing Beb prevents high-pressure gas from flowing into the gap between the eccentric shaft 1 and the side housing Esb.

As described above, according to this embodiment, by providing the lid body lightly press-fitted into the side housing B, the amount of oil supply can be kept constant, and the performance and efficiency of the rotary expansion-compressor can be stabilized.

Effects of the Invention As described above, the present invention provides a cover that is lightly press-fitted into the end face of the side housing B, thereby preventing the inflow of high pressure gas through the gap between the eccentric shaft and the side housing B, and preventing the inflow of high pressure gas into the high pressure shell. Only the lubricating oil is sucked by the suction force of the differential pressure between the chamber and the intermediate pressure chamber, and by keeping the amount of oil supplied constant, the refrigerant seal in the lubricating oil is improved, and the friction loss of the sliding parts is reduced, and rotation is improved. The performance and efficiency of the expansion compressor can be stabilized.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a rotary expansion compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional rotary expansion compressor. 1... Eccentric shaft, 2... Cylinder, 3...
... Rolling piston, 5 ... Vane, 6
a, instep: side housing A, eb: side housing E, 7: oil filler, 13: lid body.

Claims (1)

[Claims] an eccentric shaft installed in a sealed shell; a cylinder forming a compression chamber concentrically with the center of rotation of the eccentric shaft; and a cylinder installed on the eccentric shaft and rolling along the inner wall of the cylinder as the eccentric shaft rotates. A rolling piston, a vane that is in contact with the outer circumference of the rolling piston and partitions the compression chamber into a high pressure chamber and a low pressure chamber, a side housing A that is in close contact with the motor side of the cylinder, and a vane that is in close contact with the opposite side of the cylinder from the motor. A side housing B, an oil hole formed in the side housing B and communicating with sliding parts such as the eccentric shaft and the rolling piston, and a lid lightly press-fitted into the end surface of the side housing B. A rotary compressor.