Scroll compressor that includes a non-orbiting scroll having a bypass hole

Patent metadata

Field	Value
Publication number	US-10428819-B2
Application number	US-201615390221-A
Country	US
Kind code	B2
Filing date	Dec 23, 2016
Priority date	May 25, 2016
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

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 configured to bypass a refrigerant of the compression chamber into the casing, an opening/closing valve assembly configured to open and close the communication passage, and a switching valve assembly configured to operate the opening/closing valve assembly, the switching valve assembly being provided outside the casing and connected to the opening/closing valve assembly, whereby an installation of the bypass hole can result in prevention of over-compression and an installation of a control valve for varying a capacity outside the casing can result in reduction of costs for the control valve.

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 allow a refrigerant of the compression chamber to flow;
an opening/closing valve assembly configured to open and close the communication passage; and
a switching valve assembly configured to control the opening/closing valve assembly, the switching valve assembly to be coupled to the opening/closing valve assembly, and the switching valve assembly to be provided outside the casing,
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, and
wherein the opening/closing valve assembly is disposed at a backstream side rather than the check valve to open and close the communication passage that accommodates the check valve therein.

2. The scroll compressor of claim 1 , wherein the opening/closing valve assembly is disposed outside the non-orbiting member.

3. 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 provide 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 at the intermediate pressure chamber;
a check valve provided at the bypass hole to open and close the bypass hole based on pressure at the intermediate pressure chamber;
a communication passage formed at the back pressure chamber assembly or the non-orbiting scroll to provide communication between the bypass hole and the low pressure portion of the casing;
a first valve assembly disposed on the back pressure chamber assembly or the non-orbiting scroll to selectively open and close the communication passage; and
a second valve assembly to couple to the first valve assembly, and 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.

4. The scroll compressor of claim 3 , comprising a connection pipe that passes through the casing, wherein the second valve assembly is provided outside the casing, and the second valve assembly is to couple to the first valve assembly by at least the connection pipe.

5. The scroll compressor of claim 3 , 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 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 a portion between the communication passage and the exhaust hole based on pressure at the differential pressure space.

6. The scroll compressor of claim 3 , 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.

7. The scroll compressor of claim 6 , comprising a plurality of valve accommodation grooves and a communication groove, wherein the plurality of valve accommodation grooves are provided on the back pressure chamber assembly or the non-orbiting scroll, wherein the plurality of valve accommodation grooves to respectively accommodate the plurality of check valves, and the communication groove is provided between two of the plurality of valve accommodation grooves.

8. The scroll compressor of claim 3 , wherein the second valve assembly comprises:
a power supply to couple to an external power source, the power supply includes a mover;
a valve portion to couple to the mover of the power supply, and the valve portion is to change a flow direction of a refrigerant; and
a connecting portion to couple to the valve portion, and the connecting portion is provided through the casing such that the refrigerant, having the changed flow direction based on the valve portion, is provided to the first valve assembly.

9. The scroll compressor of claim 8 , wherein the connecting portion comprises:
a first connection pipe to allow a refrigerant of first pressure to flow toward the valve portion;
a second connection pipe to allow a refrigerant of second pressure to flow toward the valve portion, the second pressure being less than the first pressure; and
a third connection pipe to couple between the first valve assembly and the second valve assembly, and the third connection pipe is to selectively couple to the first connection pipe and the second connection pipe by the valve portion such that the first pressure or the second pressure is applied to the first valve assembly.

10. 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 and 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 facing 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 formed on at least one of the surface of the non-orbiting scroll or a surface of the back pressure plate corresponding to the surface of the non-orbiting scroll,
wherein a discharge hole to allow communication 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 on an outer surface of the non-orbiting scroll or the back pressure plate, and
wherein a second valve assembly is provided outside the casing, the second valve assembly is to operate based on an ext

Assignees

• Lg Electronics Inc

Inventors

• Jin Honggyun
• Joo Sangwoo

Classifications

• F05B2210/14

  Refrigerants with particular properties, e.g. HFC-134a · CPC title

• F04C28/26 Primary

  using bypass channels · CPC title

• Y10S417/902

  Hermetically sealed motor pump unit · CPC title

• F04C2240/20

  Rotors · CPC title

• F04C2240/10

  Stators · CPC title