Scroll compressor of lower compression type enabling active oil supply

Patent metadata

Field	Value
Publication number	US-11713752-B2
Application number	US-202017075198-A
Country	US
Kind code	B2
Filing date	Oct 20, 2020
Priority date	Nov 5, 2019
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

A compressor includes a driving motor, a centrifugation space, a discharge pipe, a rotary shaft, a compression portion, a pump assembly, and an oil pickup. The centrifugation space is defined inside a case by a downstream side of the driving motor and the case, and enables centrifugation of a compressed refrigerant and a lubricant oil. The discharge pipe can discharge the refrigerant from the centrifugation space outside the case. The rotary shaft is coupled to a rotor of the driving motor and defines an oil supply path. The compression portion is provided at an upstream side of the driving motor and can compress the refrigerant as the rotary shaft rotates. The pump assembly is provided below the rotary shaft and can pump oil as rotated with the rotary shaft. The oil pickup defines an oil supply path between the pump assembly and a low oil space formed inside the case.

First claim

What is claimed is:

1. A compressor comprising: a case that defines an oil space; a driving motor that includes a stator disposed in the case and a rotor disposed in the stator, wherein the rotor is configured to rotate in the stator; a centrifugation space that is defined in the case by a first side of the driving motor and the case, and that is configured to permit centrifugation of a compressed refrigerant and a lubricant oil; a discharge pipe that is disposed at the case and configured to discharge the refrigerant from the centrifugation space to an exterior of the case; a rotary shaft that is coupled to the rotor and configured to rotate based on rotation of the rotor, wherein the rotary shaft defines a first oil supply path; a compression portion that is disposed at a second side of the driving motor that is opposite to the first side of the driving motor, wherein the compression portion is configured to compress the refrigerant based on rotation of the rotary shaft; a muffler that is configured to receive the compressed refrigerant that is discharged from the compression portion, wherein the compression portion being configured to guide the compressed refrigerant to the discharge pipe; a pump assembly that is configured to rotate with the rotary shaft and pump the oil based on the rotation of the pump assembly; and an oil pickup that defines a second oil supply path between the pump assembly and the oil space of the case, wherein the pump assembly includes: an oil pump that is connected to the rotary shaft, and pump housings that receive the oil pump, wherein a pump holder portion is defined at a center of the muffler and recessed toward the driving motor, and wherein the pump assembly is disposed in the pump holder portion, wherein the pump housing includes: an upper housing that is inserted into the pump holder portion of the muffler, and a lower housing that is coupled with the upper housing, and wherein the upper housing includes a shaft support portion of the upper housing that receives the rotary shaft through the shaft support portion of the upper housing; and a third boss that protrudes toward the driving motor.

2. The compressor of claim 1 , wherein the compression portion further includes a fixed scroll and an orbiting scroll that is configured to orbit with respect to the fixed scroll and compress the refrigerant based on orbiting of the orbiting scroll with respect to the fixed scroll.

3. The compressor of claim 2 , wherein the shaft support portion of the fixed scroll is disposed at a center of the fixed scroll and receives the rotary shaft through the shaft support portion of the fixed scroll, and wherein the shaft support portion of the fixed scroll includes a first boss that protrudes toward the oil space of the case.

4. The compressor of claim 3 , wherein a shaft support portion of the pump holder portion is disposed at a center of the pump holder portion and receives the rotary shaft through the shaft support portion of the pump holder portion, and wherein the shaft support portion of the pump holder portion includes a second boss that protrudes toward the driving motor.

5. The compressor of claim 4 , wherein at least a portion of the first boss is inserted into the second boss, and wherein the first boss and the second boss are at least partially overlapped with each other.

6. The compressor of claim 3 , wherein at least a portion of the third boss is inserted into the first boss, and wherein the first boss and the third boss are at least partially overlapped with each other.

7. The compressor of claim 6 , wherein the lower housing includes an end shaft support portion that receives and supports an end of the rotary shaft.

8. The compressor of claim 7 , wherein a pumping space is defined between the shaft support portion of the upper housing and the end shaft support portion of the lower housing and receives the oil pump, and
wherein the lower housing includes a communication portion that fluidly communicates the pumping space with the oil space.

9. The compressor of claim 8 , wherein the communication portion includes a pickup arrangement groove that receives the oil pickup.

10. The compressor of claim 8 , wherein the lower housing includes a plurality of coupling holes that are coupled with the upper housing.

11. The compressor of claim 2 , wherein the rotary shaft includes:
a motor coupling portion that is coupled with the driving motor;
a main bearing portion that extends from the motor coupling portion;
an eccentric portion that extends from the main bearing portion and is coupled with the orbiting scroll;
a sub bearing portion that extends from the eccentric portion; and
a pump coupling portion that extends from the sub bearing portion and is coupled with the pump assembly.

12. The compressor of claim 11 , wherein the motor coupling portion, the main bearing portion, the sub bearing portion and the pump coupling portion are coaxial, and wherein the pump coupling portion has a smaller outer diameter than the motor coupling portion, the main bearing portion, and the sub bearing portion.

13. The compressor of claim 11 , wherein the pump assembly includes pump housings that have a pumping space that receives the oil pump, and
wherein an end shaft support portion is defined abutted to the pumping space inside the pump housings.

14. The compressor of claim 13 , wherein an oil that is received into the end shaft support portion is supplied to an upper portion of the rotary shaft through the first oil supply path of the rotary shaft.

15. The compressor of claim 14 , wherein the compression portion includes a back pressure chamber that has a pressure lower than the first oil supply path, and
wherein the oil is supplied to the upper portion based on (i) a differential pressure between the first oil supply path and the back pressure chamber and (ii) a pumping pressure of the pump assembly.

Assignees

• Lg Electronics Inc

Inventors

• Kim Taekyoung
• Lee Kyungho
• Kim Cheolhwan

Classifications

• F04C2240/40

  Electric motor · CPC title

• F04C2240/809

  Lubricant sump · CPC title

• F04C2240/806

  Pipes for fluids; Fittings therefor · CPC title

• F04C2240/56

  Bearing bushings or details thereof · CPC title

• F04C23/005

  of dissimilar working principle · CPC title