Scroll compressor

Patent metadata

Field	Value
Publication number	US-2017342984-A1
Application number	US-201615390246-A
Country	US
Kind code	A1
Filing date	Dec 23, 2016
Priority date	May 30, 2016
Publication date	Nov 30, 2017
Grant date	—

Abstract

A scroll compressor according to the present invention includes a casing, an orbiting member provided within the casing and performing an orbiting motion, a non-orbiting member forming a compression chamber together with the orbiting member, the compression chamber having a suction chamber, an intermediate pressure chamber and a discharge chamber, a communication passage communicating inside and outside of the compression chamber with each other, an opening/closing valve assembly provided outside the non-orbiting member within the casing and opening and closing the communication passage, and a switching valve assembly provided within the casing and operating the opening/closing valve assembly, whereby a facilitated fabrication, improved valve responsiveness and a relaxed restriction for a specification of a valve can be achieved, and also an over-compression can be prevented by an installation of a check valve, and an assembling efficiency can be improved by installing two valve assemblies outside the non-orbiting member.

First claim

What is claimed is:

1 . A scroll compressor, comprising:
a casing; an orbiting member provided within the casing, and the orbiting member to perform an orbiting motion; a non-orbiting member, wherein the orbiting member and the non-orbiting member to form a compression chamber, the compression chamber having a suction chamber, an intermediate pressure chamber and a discharge chamber; a communication passage configured to communicate inside and outside of the compression chamber; an opening/closing valve assembly configured to open and close the communication passage, the opening/closing valve assembly provided outside the non-orbiting member and within the casing; and a switching valve assembly configured to control the opening/closing valve assembly, the switching valve assembly being provided within the casing.

2 . The scroll compressor of claim 1 , wherein the opening/closing valve assembly includes a valve to operate based on a pressure difference, and the switching valve assembly includes a valve to be electronically controlled.

3 . The scroll compressor of claim 2 , comprising a connection passage provided outside of the non-orbiting member, wherein the opening/closing valve assembly and the switching valve assembly are coupled to each other via the connection passage.

4 . The scroll compressor of claim 2 , comprising a connection passage provided within the non-orbiting member, wherein the opening/closing valve assembly and the switching valve assembly are coupled to each other via the connection passage.

5 . The scroll compressor of claim 1 , wherein the non-orbiting member includes a bypass hole to allow a refrigerant of the intermediate pressure chamber to at least partially pass, and wherein a check valve is provided at the bypass hole to open and close the bypass hole.

6 . The scroll compressor of claim 1 , wherein the non-orbiting member includes a plurality of bypass holes, and wherein a plurality of check valves are provided at the plurality of bypass holes, respectively, to open and close the corresponding bypass hole.

7 . A scroll compressor, comprising:
a casing having a hermetic inner space separated into a low pressure portion and a high pressure portion; an orbiting scroll disposed within the inner space of the casing, and the orbiting scroll to perform an orbiting motion; a non-orbiting scroll, wherein the orbiting scroll and the non-orbiting scroll to form a compression chamber, the compression chamber having a suction chamber, an intermediate pressure chamber and a discharge chamber; a back pressure chamber assembly coupled to the non-orbiting scroll to form a back pressure chamber; a bypass hole provided at the intermediate pressure chamber; a check valve at the bypass hole to open and close the bypass hole; a valve accommodation groove formed on at least one of the non-orbiting scroll or the back pressure chamber assembly, wherein the check valve is provided in the valve accommodation groove; a communication passage to provide communication between the valve accommodation groove and the low pressure portion of the casing; a first valve assembly provided on the back pressure chamber assembly or the non-orbiting scroll to selectively open and close the communication passage; and a second valve assembly provided within the casing and coupled to the first valve assembly, the second valve assembly to control opening and closing operations of the first valve assembly such that the first valve assembly opens and closes the communication passage.

8 . The scroll compressor of claim 7 , comprising a connection pipe provided outside of the non-orbiting scroll or the back pressure chamber assembly, wherein the first valve assembly and the second valve assembly are coupled to each other via the connection pipe.

9 . The scroll compressor of claim 7 , comprising a connection passage groove provided on the non-orbiting scroll or the back pressure chamber assembly, wherein the first valve assembly and the second valve assembly are coupled to each other via the connection passage groove.

10 . The scroll compressor of claim 7 , wherein the first valve assembly comprises:
a valve guide having a valve space to provide communication with the communication passage, an exhaust hole to provide communication between the valve space and the low pressure portion, a differential pressure space formed at one side of the valve space, and an injection hole to provide communication between the differential pressure space and the second valve assembly such that pressure is applied to the differential pressure space; and a valve at the valve space to open and close the communication passage based on pressure at the differential pressure space.

11 . The scroll compressor of claim 7 , wherein the second valve assembly comprises:
a multifold part having a plurality of passages coupled to the back pressure chamber, the low pressure portion of the casing and the first valve assembly, respectively; and a valve part selectively connecting each passage of the multifold part to change a flow direction of a refrigerant.

12 . The scroll compressor of claim 7 , wherein the bypass hole includes a plurality of bypass holes, and the check valve includes a plurality of check valves to independently open and close the plurality of bypass holes, respectively.

13 . The scroll compressor of claim 12 , wherein the valve accommodation groove includes a plurality of valve accommodation grooves, wherein the plurality of check valves are provided at the plurality of valve accommodation grooves, respectively, and wherein a communication groove is provided between two of the plurality of valve accommodation grooves.

14 . A scroll compressor, comprising:
a casing; a driving motor within an inner space of the casing; a high/low pressure dividing plate attached to the driving motor to separate the inner space of the casing into a low pressure portion and a high pressure portion; a main frame spaced from the high/low pressure dividing plate; an orbiting scroll at the main frame to perform an orbiting motion based on the driving motor; a non-orbiting scroll to move up and down with respect to the orbiting scroll, and the non-orbiting scroll to form, along with the orbiting scroll, a suction chamber, an intermediate pressure chamber and a discharge chamber; a back pressure plate attached to the non-orbiting scroll, and the back pressure plate having a space portion to communicate with the intermediate pressure chamber and having an open surface to face the high/low pressure dividing plate; and a floating plate movably coupled to the back pressure plate to hermetically seal the space portion so as to form a back pressure chamber, wherein the non-orbiting scroll includes:
a plurality of bypass holes formed from the intermediate pressure chamber to a surface of the non-orbiting scroll to face the back pressure plate, and
check valves at the surface of the non-orbiting scroll for opening and closing the bypass holes, respectively,
wherein a communication groove is provided on at least one of the surface of the non-orbiting scroll or surface of the back pressure plate corresponding to the surface of the non-orbiting scroll, wherein a discharge hole to communicate between the communication groove and the low pressure portion is provided at one of the non-orbiting scroll or the back pressure plate, wherein a first valve assembly is to selectively open and close the discharge hole to selectively communicate between the intermediate pressure chamber and the low pressure portion, wherein the first valve assembly is provided

Assignees

• Lg Electronics Inc

Inventors

• Jin Honggyun
• Joo Sangwoo

Classifications

• F04C29/124

  with inlet and outlet valves specially adapted for rotary or oscillating piston pumps · CPC title

• F04C28/18

  characterised by varying the volume of the working chamber (by changing the positions of inlet or outlet openings F04C28/10) · CPC title

• F04C29/0085

  Prime movers · CPC title

• F04C2240/30

  Casings or housings · CPC title

• F04C28/26 Primary

  using bypass channels · CPC title