Vane rotary compressor

Patent metadata

Field	Value
Publication number	US-11499555-B2
Application number	US-202016734679-A
Country	US
Kind code	B2
Filing date	Jan 6, 2020
Priority date	Feb 28, 2019
Publication date	Nov 15, 2022
Grant date	Nov 15, 2022

Abstract

A vane rotary compressor may include a main bearing and a sub bearing provided with a plurality of back pressure pockets each having a different pressure formed on a surface facing the cylinder, a rotational shaft radially supported by the main bearing and the sub bearing, a roller provided with a back pressure chamber that communicates with the plurality of back pressure pockets and having a plurality of vanes configured to divide a compression space into a plurality of compression chambers. At least one of the main bearing or the sub bearing is provided with an oil supply passage that communicates with a back pressure pocket having a relatively low pressure among the plurality of back pressure pockets. Accordingly, oil may be smoothly supplied to a back pressure pocket having a low pressure.

First claim

What is claimed is:

1. A vane rotary compressor, comprising:
a casing;
a cylinder provided in an inner space of the casing;
a main bearing and a sub bearing forming a compression space together with the cylinder, and provided with a plurality of back pressure pockets each having a different pressure formed on a surface facing the cylinder;
a rotational shaft radially supported by the main bearing and the sub bearing;
a roller provided with a plurality of vane slots formed along a circumferential direction, each having a first end opened toward an outer circumferential surface; and
a plurality of vanes slidably inserted into the plurality of vane slots of the roller, respectively, and configured to divide the compression space into a plurality of compression chambers, respectively, wherein at least one of the main bearing or the sub bearing is provided with an oil supply passage that provides communication between a space between an outer circumferential surface of the rotational shaft and an inner circumferential surface of the main bearing facing the outer circumferential surface of the rotational shaft and the plurality of back pressure pockets of the main bearing, or a space between the outer circumferential surface of the rotational shaft and an inner circumferential surface of the sub bearing facing the outer circumferential surface of the rotational shaft and the plurality of back pressure pockets of the sub bearing, wherein the oil supply passage communicates with a back pressure pocket having a relatively low pressure among the plurality of back pressure pockets, wherein the main bearing and the sub bearing are each provided with a boss portion that extends from a flange defining the compression space by a predetermined height, respectively, so as to radially support the rotational shaft, wherein the oil supply passage is formed through the boss portion of at least one of the main bearing or the sub bearing, wherein the oil supply passage is provided therein with a pressure reducing member, wherein the oil supply passage is configured as a first oil supply passage that communicates with an end surface of the boss portion, and a second oil supply passage that extends from the first oil supply passage so as to communicate with the back pressure pocket having the relatively low pressure, wherein an axial center of the first oil supply passage and an axial center of the second oil supply passage are eccentrically formed with respect to each other, and wherein the first oil supply passage is formed such that a portion of an end surface thereof overlaps an inside of the second oil supply passage, and wherein the pressure reducing member is axially supported on an end surface of the second oil supply passage.

2. The vane rotary compressor of claim 1 , wherein the pressure reducing member is a pin.

3. The vane rotary compressor of claim 1 , wherein the second oil supply passage has an inner diameter larger than an inner diameter of the first oil supply passage.

4. The vane rotary compressor of claim 1 , wherein the end surface of the boss portion is provided with an oil accommodating groove, and wherein the oil accommodating groove is connected to the first oil supply passage.

5. The vane rotary compressor of claim 4 , wherein the oil accommodating groove is formed on the end surface of the boss portion in a stepped manner along an inner circumferential surface of the boss portion.

6. The vane rotary compressor of claim 4 , wherein the oil accommodating groove is formed at a middle portion of the end surface of the boss portion, and wherein the oil accommodating groove is provided with an oil communication groove that penetrates toward the inner circumferential surface of the boss portion formed in an inner circumferential surface thereof.

7. The vane rotary compressor of claim 1 , wherein the main bearing or the sub bearing is provided with a flange that extends therefrom and forms the compression space together with the cylinder, and wherein at least a portion of the first oil supply passage and the second oil supply passage is formed through the flange of the at least one of the main bearing or the sub bearing.

8. The vane rotary compressor of claim 1 , wherein the second oil supply passage, based on a rotational direction of the roller, is eccentrically formed from an intermediate position in a circumferential direction of the back pressure pocket communicating with the second oil supply passage, toward a contact point where the roller is the closest to the cylinder.

9. The vane rotary compressor of claim 1 , wherein the plurality of back pressure pockets comprises:
a first back pressure pocket having a first pressure; and
a second back pressure pocket having a pressure higher than the first pressure, and wherein the oil supply passage is formed to communicate with the first pocket.

10. The vane rotary compressor of claim 9 , wherein at least one of the first back pressure pocket or the second back pressure pocket is provided with a bearing protrusion formed on an inner circumferential side facing the outer circumferential surface of the rotational shaft to form a radial bearing surface with respect to the outer circumferential surface of the rotational shaft.

11. The vane rotary compressor of claim 10 , wherein the first back pressure pocket is provided with the bearing protrusion, and wherein the second back pressure pocket is formed such that at least a portion of the inner circumferential side facing the outer circumferential surface of the rotational shaft is opened.

Assignees

• Lg Electronics Inc

Inventors

• Noh Kiyoul
• Moon Seokhwan
• Park Joonhong

Classifications

• F04C29/12

  Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet · CPC title

• F04C2210/206

  Oil · CPC title

• F04C29/028

  Means for improving or restricting lubricant flow · CPC title

• F04C18/344 Primary

  with vanes reciprocating with respect to the inner member · CPC title

• F05B2240/50

  Bearings · CPC title