Scroll compressor having capacity varying valves

Patent metadata

Field	Value
Publication number	US-9869315-B2
Application number	US-201514965084-A
Country	US
Kind code	B2
Filing date	Dec 10, 2015
Priority date	Dec 16, 2014
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

A scroll compressor is provided that may include a casing, an orbiting scroll and a non-orbiting scroll that suctions in a refrigerant from a suction space of the casing, compresses the suctioned refrigerant in a plurality of compression chambers, and discharges the compressed refrigerant into a discharge space of the casing, and a capacity varying device having a first valve and at least one second valve coupled with each other inside of the casing to selectively bypass a portion of the refrigerant in the plurality of compression chambers. With this structure, it is possible to prevent, in advance, refrigerant from being leaked outside of the scroll compressor, reduce pressure loss as a bypass flow path is shortened, reduce a size, weight, and manufacturing costs of the scroll compressor, and vary a capacity of the scroll compressor with a small operating force, and small power consumption.

First claim

What is claimed is:

1. A scroll compressor, comprising:
a casing having a suction space;
a non-orbiting scroll provided in the suction space of the casing;
an orbiting scroll coupled to the non-orbiting scroll, the orbiting scroll forming, together with the non-orbiting scroll, a plurality of compression chambers;
a first valve having a first input port that communicates with the plurality of compression chambers, a second input port that communicates with the suction space of the casing, and an output port that communicates with the first input port or the second input port, wherein the first valve is installed in the suction space of the casing; and
at least one second valve having a cylinder, a piston that divides an internal space of the cylinder into a first space and a second space, the piston being movable in the internal space of the cylinder by the first valve, a first flow path by which the first space and the output port communicate with each other, a second flow path by which the second space and the plurality of compression chambers communicate with each other, and a third flow path by which the second space and the suction space of the casing communicate with each other when the piston moves toward the first space, wherein the at least one second valve is installed in the suction space of the casing, wherein the first input port communicates with a compression chamber of the plurality of compression chambers having a pressure higher than a pressure of a compression chamber of the plurality of compression chambers that communicates with the second space wherein the at least one second valve includes:
at least one first intermediate pressure hole that communicates with a compression chamber of the plurality of compression chambers to which a first intermediate pressure defined as a value between a suction pressure and a discharge pressure is applied; and
a second intermediate pressure hole that communicates with a compression chamber of the plurality of compression chambers to which a second intermediate pressure defined as a value between the first intermediate pressure and the discharge pressure is applied, and wherein the at least one first intermediate pressure hole communicates with the second flow path, and the second intermediate pressure hole communicates with the first input port, wherein the at least one second valve includes a plurality of second valves, and wherein a plurality of first flow paths provided in each of the plurality of second valves is connected in parallel to the output port.

2. The scroll compressor of claim 1 , wherein a single block provided with the first valve and the at least one second valve is coupled to the non-orbiting scroll.

3. The scroll compressor of claim 1 , wherein at least one block provided with the first valve and the at least one second valve is coupled to the non-orbiting scroll, and wherein the at least one block includes:
a first block coupled to the non-orbiting scroll; and
a second block coupled to the first block, wherein the first valve is mounted on the second block.

4. The scroll compressor of claim 1 , wherein at least one block provided with the first valve and the at least one second valve is coupled to the non-orbiting scroll, wherein a through-projection that guides a refrigerant discharged from the plurality of compression chambers is formed at the at least one block, and wherein the through-projection is sealing-coupled to a ring-shaped wall that protrudes from an inner wall surface of the casing to be connected to a discharge pipe that communicates with the casing.

5. A scroll compressor, comprising:
a casing;
an orbiting scroll and a non-orbiting scroll forming a plurality of compression chambers, the orbiting scroll and the non-orbiting scroll suctioning in and compressing a refrigerant from a suction space of the casing to discharge the refrigerant into a discharge space of the casing;
a first valve operated by a signal input from outside of the casing; and
at least one second valve coupled with the first valve to selectively bypass a portion of a refrigerant in the plurality of compression chambers, wherein the first valve and the at least one second valve are installed within the suction space of the casing wherein at least one block is coupled to the non-orbiting scroll, wherein the first valve and the at least second valve are provided in the at least one block, wherein the first valve includes a first input port that communicates with a compression chamber of the plurality of compression chambers having a higher pressure than a pressure of a compression chamber of the plurality of compression chambers that communicates with the suction space, wherein the non-orbiting scroll includes:
at least one first intermediate pressure hole that communicates with a compression chamber of the plurality of compression chambers to which a first intermediate pressure defined as a value between a suction pressure and a discharge pressure is applied; and
a second intermediate pressure hole that communicates with a compression chamber of the plurality of compression chambers to which a second intermediate pressure defined as a value between the at least one first intermediate pressure and the discharge pressure is applied, wherein the at least one first intermediate pressure hole communicates with a second flow path, and the second intermediate pressure hole communicates with the first input port, wherein, in the at least one block, a plurality of each of the at least one first intermediate pressure hole, the second flow path, a cylinder, a piston, and a third flow path is provided and one of each of the second intermediate pressure hole and the first valve is provided, and wherein a first flow path is formed to allow an output port of the one first valve and a first space of the plurality of cylinders to communicate with each other.

6. The scroll compressor of claim 5 , wherein that least one block includes:
a first block coupled to the non-orbiting scroll; and
a second block coupled to the first block, the second block having the first valve mounted thereto, wherein a first portion of the first flow path, and one of each of the plurality of the second flow path, the third flow path, the cylinder, and the piston are provided in the first block, and a second portion of the first flow path is provided in the second block.

7. The scroll compressor of claim 6 , wherein the first flow path includes:
a plurality of first holes that, respectively, communicates with a first space of the cylinder;
a second hole that communicates with the output port; and
a third hole by which the plurality of first holes and the second hole communicate with each other, wherein the plurality of first holes of the first flow path is formed in the first block, the second hole of the first flow path is formed in the second block, and the third hole of the first flow path is formed as a groove recessed in a contact surface of the first block with the second block or a contact surface of the second block with the first block.

8. A scroll compressor, comprising
a casing;
an orbiting scroll and a non-orbiting scroll forming a plurality of compression chambers, the orbiting scroll and the non-orbiting scroll suctioning in and compressing a refrigerant from a suction space of the casing to discharge the refrigerant into a discharge space of the casing;
a first valve operated by a signal input from outside of the casing; and
at least one second valve coupled with the first valve to selectively bypass a portion of a refrigerant in the plurality of compression chambers, wherein the first valve and the at least one second valve are installed within the suction space of the casing, wherein the at least one second

Assignees

• Lg Electronics Inc

Inventors

• Jang Kitae
• Lee Jaesang
• Won Inho
• Lee Byeongchul

Classifications

• F04C29/023

  Lubricant distribution through a hollow driving shaft (F04C29/025 takes precedence) · CPC title

• F04C2240/811

  Actuator for control, e.g. pneumatic, hydraulic, electric · CPC title

• F04C18/0215

  where only one member is moving · CPC title

• F04C28/26 Primary

  using bypass channels · CPC title