Screw compressor, refrigeration system, and method for controlling refrigeration system

Patent metadata

Field	Value
Publication number	US-12297835-B2
Application number	US-202117917535-A
Country	US
Kind code	B2
Filing date	Apr 6, 2021
Priority date	Apr 9, 2020
Publication date	May 13, 2025
Grant date	May 13, 2025

Abstract

Disclosed is a screw compressor ( 100 ), comprising a screw compressor housing ( 101 ), a discharge cavity ( 113 ), at least one silencing channel, and at least one adjustment piston, wherein the discharge cavity ( 113 ) is defined by at least one part of the screw compressor housing ( 101 ); the at least one part of the screw compressor housing ( 101 ) defining the discharge cavity ( 113 ) forms a wall of the discharge cavity ( 113 ); at least one hole is provided in the wall of the discharge cavity ( 113 ); the at least one adjustment piston can be inserted into the at least one hole and move therein; the at least one silencing channel is formed by the at least one hole and the at least one adjustment piston, and the at least one silencing channel is in fluid communication with the discharge cavity ( 113 ); and the position of the at least one adjustment piston in the at least one hole determines the silencing length of the at least one silencing channel.

First claim

What is claimed is:

1. A screw compressor, comprising:
a screw compressor housing;
a discharge cavity, the discharge cavity being defined by at least one part of the screw compressor housing, the at least one part of the screw compressor housing defining the discharge cavity forming a wall of the discharge cavity, and at least two holes being provided in the wall of the discharge cavity;
at least two adjustment pistons each configured to be inserted into a respective hole of the at least two holes and to move therein; and
at least two silencing channels, the at least two silencing channels being formed by the at least two holes and the at least two adjustment pistons, and the at least two silencing channels being in fluid communication with the discharge cavity,
wherein a respective position of each of the at least two adjustment pistons in the respective hole determines a silencing length of a respective silencing channel of the at least two silencing channels;
wherein the screw compressor further comprises an adjustment slider, and the at least two adjustment pistons are connected to the adjustment slider; and
wherein the adjustment slider and the at least two adjustment pistons are configured such that each of the at least two adjustment pistons can do reciprocating movement in the respective silencing channel when the adjustment slider does reciprocating movement relative to the screw compressor housing, thereby changing the silencing length of each of the at least two silencing channels.

2. The screw compressor according to claim 1 , wherein:
the at least two adjustment pistons can do the reciprocating movement relative to the screw compressor housing independently of each other.

3. The screw compressor according to claim 1 , wherein:
the at least two adjustment pistons are configured such that each of the at least two silencing channels has a different silencing length at any moment when the at least two adjustment pistons do reciprocating movement relative to the screw compressor housing.

4. The screw compressor according to claim 1 , wherein:
the at least two holes are each is provided with an inlet end and a distal end opposite to the inlet end, and configured to receive a respective one of the at least two adjustment pistons from the distal end; and
a distance between a top portion of the respective one of the at least two adjustment pistons and the inlet end is the silencing length.

5. The screw compressor according to claim 1 , wherein:
the at least two holes are each is provided with an inlet end and a distal end opposite to the inlet end, and configured to receive a respective one of the at least two adjustment pistons from the distal end; and
the respective one of the at least two adjustment pistons is provided with a recess extending from an end surface of one end of the respective one of the at least two adjustment positions to another end thereof, and a distance between a bottom of the recess and the inlet end is the silencing length.

6. The screw compressor according to claim 1 , wherein:
the screw compressor further comprises an adjustment box, the adjustment box being arranged on an outer side of the screw compressor housing and defining an adjustment cavity; and
the adjustment slider is disposed in the adjustment box and divides the adjustment cavity into a first accommodation portion and a second accommodation portion, the first accommodation portion is formed on one side of the adjustment slider close to the screw compressor housing, and the second accommodation portion is formed between the adjustment box and the adjustment slider.

7. A screw compressor, comprising:
a screw compressor housing;
a discharge cavity, the discharge cavity being defined by at least one part of the screw compressor housing, the at least one part of the screw compressor housing defining the discharge cavity forming a wall of the discharge cavity, and a hole is provided in the wall of the discharge cavity;
an adjustment box, the adjustment box being arranged on an outer side of the screw compressor housing and defining an adjustment cavity, and the adjustment cavity and the hole forming a continuous channel;
an adjustment piston configured to be inserted into the continuous channel and move therein; and
a silencing channel, the silencing channel being formed by the hole, the adjustment piston and the adjustment box, and the silencing channel being in fluid communication with the discharge cavity,
wherein a position of the adjustment piston in the hole and the adjustment cavity determines a silencing length of the silencing channel.

8. The screw compressor according to claim 7 , wherein:
the screw compressor further comprises at least one plate, the at least one plate being arranged in the discharge cavity and covering the hole; and
the at least one plate is provided with a plurality of perforations configured to place the discharge cavity in fluid communication with the silencing channel.

9. The screw compressor according to claim 7 , wherein:
the adjustment piston is disposed in the adjustment box, and divides the adjustment cavity into a first accommodation portion and a second accommodation portion, the first accommodation portion is formed on one side of the adjustment piston close to the screw compressor housing, and the second accommodation portion is formed between the adjustment box and the adjustment piston.

10. A refrigeration system, comprising:
the screw compressor according to claim 7 ; and
a lubricant circuit, the lubricant circuit being connected to the screw compressor,
wherein the second accommodation portion communicates with the lubricant circuit in a closable manner and communicates with an inlet of the screw compressor in a closable manner;
and wherein the refrigeration system is configured to supply a lubricant from the lubricant circuit to the second accommodation portion to cause each of the at least two adjustment pistons to move towards a respective inlet end of each of the at least two holes and configured to introduce the lubricant in the second accommodation portion into the inlet of the screw compressor to cause each of the at least two adjustment pistons to move away from the respective inlet end.

11. The screw compressor according to claim 2 , wherein:
the at least two adjustment pistons are configured such that each of the at least two silencing channels has a different silencing length at any moment when the at least two adjustment pistons do reciprocating movement relative to the screw compressor housing.

12. A screw compressor, comprising:
a screw compressor housing;
a discharge cavity, the discharge cavity being defined by at least one part of the screw compressor housing, the at least one part of the screw compressor housing defining the discharge cavity forming a wall of the discharge cavity, and at least two holes being provided in the wall of the discharge cavity;
at least two adjustment pistons each configured to be inserted into a respective hole of the at least two holes and to move therein; and
at least two silencing channels, the at least two silencing channels being formed by the at least two holes and the at least two adjustment pistons, and the at least two silencing channels being in fluid communication with the discharge cavity,
wherein a respective position of each of the at least two adjustment pistons in the at least two holes determines a silencing length of a respective silencing channel of the at least two silencing channels; and
wherein the at least two adjustment pistons can do reciprocating movement relative to the screw compressor housing independently of each other, there

Assignees

• Johnson Controls Air Conditioning And Refrigeration Wuxi Co Ltd
• Johnson Controls Tyco IP Holdings LLP
• Tyco Fire & Security Gmbh

Inventors

• Yang Shengmei
• Wang Li
• Lin Kun
• Yu Zhengxiang

Classifications

• F25B49/022

  Compressor control arrangements · CPC title

• F25B31/002

  Lubrication · CPC title

• F25B1/047 Primary

  of screw type · CPC title

• F04C29/12

  Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet · CPC title

• F04C29/02

  Lubrication (of machines or engines in general F01M); Lubricant separation (separation in general B01D) · CPC title