Scroll compressor

Patent metadata

Field	Value
Publication number	US-10954942-B2
Application number	US-201815996883-A
Country	US
Kind code	B2
Filing date	Jun 4, 2018
Priority date	Jun 15, 2017
Publication date	Mar 23, 2021
Grant date	Mar 23, 2021

Abstract

A scroll compressor includes a casing accommodating a rotary shaft and a driving unit, a first scroll making an orbiting movement by the rotary shaft, a second scroll engaged with the first scroll to form a compression chamber and having a bypass hole bypassing a refrigerant sucked into the compression chamber to an internal space of the casing, and a back-pressure chamber assembly pressing the second scroll toward the first scroll, wherein the back-pressure chamber assembly includes: a back-pressure space, a first valve unit allowing the bypass hole and the internal space of the casing to selectively communicate with each other, and a second valve unit opened and closed to selectively supply the refrigerant of the back-pressure space to the first valve unit to operate the first valve unit, and positioned to be fixed to the casing.

First claim

What is claimed is:

1. A scroll compressor comprising:
a casing that defines an internal space;
a rotary shaft located in the casing;
a driving unit configured to rotate the rotary shaft;
a first scroll located in the casing and connected to the rotary shaft, the first scroll being configured to rotate based on rotation of the rotary shaft;
a second scroll that is engaged with the first scroll, that defines a compression chamber based on engagement with the first scroll, and that defines a bypass hole configured to allow flow of refrigerant from the compression chamber to the internal space of the casing; and
a back-pressure chamber assembly that is configured to provide pressure to the second scroll toward the first scroll and that defines a back-pressure space configured to receive the refrigerant and to communicate with the compression chamber,
wherein the back-pressure chamber assembly comprises:
a first valve unit that is configured to receive the refrigerant from the back-pressure space and that selectively enables communication between the bypass hole and the internal space of the casing based on operation modes, and
a second valve unit that is coupled to the casing, that defines an inlet configured to receive the refrigerant from the first valve unit and an outlet configured to discharge the refrigerant to the internal space of the casing, and that is configured to operate the first valve unit based on allowing or restricting communication between the inlet and the outlet,

wherein the back-pressure chamber assembly further defines a leakage passage that enables communication between the first valve unit and the internal space of the casing.

2. The scroll compressor of claim 1 , wherein the back-pressure chamber assembly further comprises a bypass valve configured to move relative to the second scroll, the bypass valve being configured to, based on movement relative to the second scroll, separate from the bypass hole and contact the bypass hole,
wherein the back-pressure chamber assembly defines a valve space that accommodates the bypass valve, and
wherein the leakage passage is recessed from an outer surface of the bypass valve.

3. The scroll compressor of claim 2 , wherein the back-pressure chamber assembly further defines an intermediate pressure passage that enables communication between the back-pressure space and the valve space, and
wherein the back-pressure chamber assembly further a pressure reducing insert that is located inside of the intermediate pressure passage and that has an outer diameter less than an inner diameter of the intermediate pressure passage.

4. The scroll compressor of claim 1 , the back-pressure chamber assembly further comprises a bypass valve configured to move relative to the second scroll, the bypass valve being configured to, based on movement relative to the second scroll, separate from the bypass hole and contact the bypass hole,
wherein the back-pressure chamber assembly further defines a valve space that accommodates the bypass valve,
wherein the leakage passage extends from an inner surface of the valve space to an outer surface of the back-pressure chamber assembly, and
wherein the back-pressure chamber assembly further comprises a pressure reducing insert that is located inside of the leakage passage and that has an outer diameter less than an inner diameter of the leakage passage.

5. The scroll compressor of claim 4 , wherein the first valve unit further defines a discharge groove that is configured to communicate with the leakage passage and that enables communication between the bypass hole and the internal space of the casing based on the bypass valve separating from the bypass hole.

6. The scroll compressor of claim 5 , wherein the first valve unit is configured to restrict communication between the bypass hole and the discharge groove based on the bypass valve contacting the bypass hole.

7. The scroll compressor of claim 1 , wherein the second valve unit comprises:
a valve housing that defines a communication space connected to the inlet and the outlet; and
a valve body that is configured to move in the communication space and that is configured to open and close the inlet based on movement in the communication space.

8. A scroll compressor comprising:
a casing that defines an internal space;
a rotary shaft located in the casing;
a driving unit configured to rotate the rotary shaft;
a first scroll located in the casing and connected to the rotary shaft, the first scroll being configured to rotate based on rotation of the rotary shaft;
a second scroll that is engaged with the first scroll, that defines a compression chamber based on engagement with the first scroll, and that defines a bypass hole configured to allow flow of refrigerant from the compression chamber to the internal space of the casing; and
a back-pressure chamber assembly configured to provide pressure to the second scroll toward the first scroll, the back-pressure chamber assembly defining a back-pressure space configured to receive the refrigerant and to communicate with the compression chamber,
wherein the back-pressure chamber assembly comprises:
a first valve unit that defines a valve space and that selectively enables communication between the bypass hole and the internal space of the casing based on operation modes, the first valve unit comprising a bypass valve located in the valve space, and
a second valve unit that is coupled to the casing, that defines an inlet configured to receive the refrigerant from the back-pressure space and an outlet configured to supply the refrigerant to the first valve unit, and that is configured to operate the first valve unit based on allowing and restricting communication between the inlet and the outlet, and

wherein the back-pressure chamber assembly defines a leakage passage that enables communication between the valve space of the first valve unit and the internal space of the casing in a state in which the bypass valve closes the bypass hole.

9. The scroll compressor of claim 8 , wherein the leakage passage is recessed from an outer surface of the bypass valve.

10. The scroll compressor of claim 9 , wherein the first valve unit further defines a discharge groove that is configured to communicate with the leakage passage and that enables communication between the bypass hole and the internal space of the casing based on the bypass valve separating from the bypass hole.

11. The scroll compressor of claim 10 , wherein the second valve unit comprises an outlet passage that is connected to the outlet of the second valve unit and that enables communication between the outlet of the second valve unit and the valve space of the first valve unit, and
wherein a cross-sectional area of the leakage passage is less than a cross-sectional area of the outlet passage.

12. The scroll compressor of claim 10 , wherein the first valve unit is configured to restrict communication between the bypass hole and the discharge groove based on the bypass valve contacting the bypass hole.

13. The scroll compressor of claim 8 , wherein the leakage passage extends between an inner surface of the valve space and an outer surface of the first valve unit.

14. The scroll compressor of claim 13 , wherein the back-pressure chamber assembly further comprises a pressure reducing insert that is located inside of the leakage passage and that has an outer diameter less than an inner diameter of the leakage passage.

15. The scroll compressor of claim 8 , wherein the first valve unit further comprises a sealing member located at an inner surface of the valve spa

Assignees

• Lg Electronics Inc

Inventors

• Seong Sanghun
• Yoo Byungkil
• Jeon Nayoung

Classifications

• F04C28/26

  using bypass channels · CPC title

• F04C28/265

  being obtained by displacing a lateral sealing face · CPC title

• F04C27/005

  Axial sealings for working fluid · CPC title

• F04C18/0215 Primary

  where only one member is moving · CPC title

• F04C23/008

  Hermetic pumps · CPC title