JPS61192887A - Rotary type compressor - Google Patents

Abstract

PURPOSE:To enable to reduce the outflow of lubricating oil into a refrigerating cycle by fitting a ring-formed cover for preventing the scattering of oil on the end part of the upper bearing of a closed type rotary compressor. CONSTITUTION:A ring-formed cover 12 with an oil outlet hole 12a is fitted on the end part of an upper bearing 5 of a closed type rotary compressor. Thus, even if oil supplied from the oil reservoir at the lower part of the vessel via an oil passage 4 formed in a crank shaft 3 leaks from the end part of the upper bearing and is scattered around by the rotation of the crank shaft 3, such oil is collected by the ring-formed cover 12 to prevent it from being mixed into the discharge gas in a state of mist, and accordingly the outflow of lubricating oil into a refrigerating cycle can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a bearing structure for a rotary compressor for refrigeration and air-conditioning equipment.

BACKGROUND ART A conventional rotary compressor stores lubricating oil at the bottom of a closed container and sucks this lubricating oil using a centrifugal pump action, as shown in Japanese Utility Model Application Publication No. 51-82011. There are a so-called rolling piston type and a rotary vane type, which have a rotating shaft with a suction hole and two upper and lower bearings that support the rotating shaft. Lubrication of the sliding surface between the rotating shaft and the upper bearing of these (b) rotary compressors is as follows:
The lubricating oil stored at the bottom of the sealed container is sucked into the rotating shaft by the centrifugal pump effect that acts as the rotating shaft rotates, and is pumped through the horizontal hole provided in the rotating shaft to the sliding part. The structure was such that when the lubrication of the parts was completed, it was discharged from the end of the bearing.

Problems to be Solved by the Invention However, in a rotary compressor with such a configuration, the lubricating oil discharged from the end of the upper bearing is scattered by the centrifugal force exerted by the rotating shaft rotating at high speed, and becomes a mist. and float in a closed container. On the other hand, the gas discharged from the compression element is once discharged into the closed container and then discharged outside the closed container. Therefore, the above-mentioned mist-shaped lubricating oil is discharged out of the sealed container together with the discharged gas, and the lubricating oil stored at the bottom of the sealed container gradually decreases, causing poor lubrication and causing seizure of the sliding parts. It had a number of problems.

In view of the above problems, the present invention provides a bearing structure for a rotary compressor that prevents the lubricating oil discharged from the end of the upper bearing from scattering and does not cause a shortage of lubricating oil.

Means for Solving the Problems: In order to solve the problems, the rotary compressor of the present invention has the following features:
A sealed container, lubricating oil stored in the inner bottom of the container, a rotating shaft having a suction hole that suctions this lubricating oil by a centrifugal pump action, an upper bearing and a lower bearing that support this rotating shaft, and a drive driven by this rotating shaft. and a ring-shaped cover disposed at the end of the upper bearing.

Effect of the Invention According to the configuration described in item b, the lubricating oil that lubricates the upper bearing is discharged from the end of the bearing and simultaneously blown away by the rotating shaft. This prevents the lubricating oil from scattering inside the sealed container, so the lubricating oil does not become mist and float inside the sealed container. Therefore, the lubricating oil is less likely to be discharged to the outside of the compressor together with the discharged gas, and a lack of lubricating oil in the bearing can be prevented.

EXAMPLE Hereinafter, a rotary compressor according to an example of the present invention will be explained with reference to the drawings.

FIG. 2 is a vertical cross-sectional view of a rotary compressor according to an embodiment of the present invention. Reference numeral 1 denotes a closed container, in which lubricating oil 2 is stored at the inner bottom, and a suction hole 4 provided in a rotating shaft 3 is shown. The open end is immersed in lubricating oil 2. Further, reference numerals 5 and 6 rotatably support the rotary shaft 3 by upper and lower bearings, respectively. 7 is a compression element, which includes a cylinder 8, a piston 9 fitted inside the eccentric part of the rotating shaft 3 and rotating eccentrically, a vane 10 that is in constant contact with the piston 9 and reciprocates freely forward and backward, and a discharge valve ( (not shown). 11 is an electric element that drives the rotating shaft 3. FIG. 1 is an enlarged vertical cross-sectional view of the main parts near the upper bearing 5 in FIG. This is a side hole created by

The operation of the rotary compressor of the embodiment configured as above will be explained below. First, as the electric element 10 rotates, the rotating shaft 3 rotates, and the compression element 7 sucks in and compresses gas, and then discharges it into the inside of the closed container 1. On the other hand, as the interlocking shaft a rotates, the lubricating oil 2 rises inside the suction hole 4 due to the action of a centrifugal pump, and is forced into the gap between the sliding part of the rotating shaft 3 and the upper bearing 5 through the horizontal hole 4a. be done. This pressure-fed lubricating oil 2 passes through a groove (not shown) provided on the inner circumferential surface of the bearing and is discharged from the upper end of the upper bearing 5. This one
The lubricating oil 2 discharged from the upper end of the bearing 5 is collected by the ring-shaped cover 12, drips through the communication hole 12a, and is deposited in the lower part of the closed container 1.

As a result, the lubricating oil 2 discharged from the end of the upper bearing 5 does not become a mist and float inside the closed container 1, so it is mixed with the gas discharged from the compression element 7 inside the closed container 1. In this embodiment, the communication hole 12a is provided in the ring-shaped cover 12, but the communication hole may also be formed by providing a slit at the end of the upper bearing 5. good.

Effects of the Invention As described above, the present invention provides a ring-shaped cover at the end of the bottom bearing of a rotary compressor, so that the lubricating oil discharged from the top bearing becomes a mist and scatters inside the closed container. This prevents the lubricating oil from being discharged together with the discharged gas to the outside of the closed container, and prevents seizure of the sliding parts due to lack of lubricating oil.

[Brief explanation of drawings]

FIG. 1 is an enlarged vertical cross-sectional view of a main part of a rotary compressor according to an embodiment of the present invention, and FIG. 2 is a vertical cross-sectional view of the rotary compressor of FIG. 1. 1... Airtight container, 2... Lubricating oil, 3.
... Rotating shaft, 4 ... Suction hole, 5 ...
...Upper bearing, 6...Lower bearing, 12...
...Ring-shaped cover. Name of agent: Patent attorney Toshio Nakao and 1 other person3-
m-rotating shaft 4--one suction completed 5--to bearing/--one clasp closed each ticket Z---14-, bone atmosphere 3--one rotation phase 4--one ψ pulling J 12-11 Cover

Claims (1)

[Claims] A sealed container, lubricating oil stored in the inner bottom of the container, a rotating shaft having a suction hole that suctions this lubricating oil by a centrifugal pump action, an upper bearing and a lower bearing that support this rotating shaft, and a drive driven by this rotating shaft. and a ring-shaped cover disposed at an end of the upper bearing.