Liquid-injected compressor or expander element and method for controlling the liquid injection of a compressor or expander device

Patent metadata

Field	Value
Publication number	US-11149733-B2
Application number	US-201616314495-A
Country	US
Kind code	B2
Filing date	Aug 23, 2016
Priority date	Aug 1, 2016
Publication date	Oct 19, 2021
Grant date	Oct 19, 2021

Abstract

Liquid-injected compressor element or expander element with a housing that comprises a rotor chamber in which at least on rotor is rotatably affixed, whereby the element is further provided with a connection for an injection circuit for the injection of liquid into the element, whereby the connection to the injection circuit is realised by means of an injection point in the housing that opens into the first compression chamber or expansion chamber. The connection to the injection circuit is additionally realised by means of an additional injection point in the housing that opens into a second or subsequent compression chamber or expansion chamber.

First claim

The invention claimed is:

1. A liquid-injected compressor or expander comprising:
a housing that comprises a rotor chamber in which two rotors are rotatably affixed, said rotors rotating with lobes of the rotors being able to mate together,
wherein the compressor or expander further comprises a connection connected to an injection circuit for the injection of a lubricating liquid into the compressor or expander,
wherein the connection to the injection circuit is realised by means of a first injection point in the housing that always opens into a first compression chamber or expansion chamber,
wherein the connection to the injection circuit is additionally realised by means of a second injection point in the housing that opens into a second or subsequent compression chamber or expansion chamber,
wherein the first compression chamber or expansion chamber is a gas chamber that is closed off after a gas inlet of the rotor chamber and said second or subsequent compression chamber or expansion chamber being formed after at least one rotor of the two rotors has rotated one pitch or revolution from the gas inlet,
wherein the first injection point is located on a first helical line formed by a tip of a lobe of a rotor that separates the first compression chamber or expansion chamber from the second or subsequent compression chamber or expansion chamber and the second injection point is located on a second helical line formed by a second tip of a second or subsequent lobe of the rotor that separates the second or subsequent compression chamber of expansion chamber from a successive compression chamber,
wherein the first injection point and the second injection point, further comprises a number of sub-injection points that each open into the first compression chamber or expansion chamber, or the second or subsequent compression chamber or expansion chamber, respectively.

2. The liquid-injected compressor or expander according to claim 1 , wherein there is at least one additional injection point, each at least one additional injection point opens into a different subsequent compression chamber or expansion chamber.

3. The liquid-injected compressor or expander according to claim 2 , wherein each at least one additional injection point further comprises a number of sub-injection points that each open into the respective different subsequent compression chamber or expansion chamber.

4. The liquid-injected compressor or expander according to claim 1 , wherein the two rotors are rotatably affixed in the rotor chamber and the second injection point is provided for each rotor.

5. The liquid-injected compressor or expander according to claim 1 , wherein a quantity of lubricating liquid that is injected via the first injection point and the second injection point are able to be controlled.

6. The liquid-injected compressor or expander according to claim 1 , wherein a temperature of the lubricating liquid that is injected via the first injection point and the second injection point are able to be controlled.

7. A method for controlling liquid injection of a compressor installation or expander installation, w herein the compressor installation or expander installation comprises at least one compressor or expander, w herein the at least one compressor or expander comprises a housing that comprises a rotor chamber in which two rotors are rotatably affixed, said rotors rotating with lobes of the rotors mated together, wherein lubricating liquid is injected into the compressor or expander, wherein the method comprises the step of:
providing at least two liquid supplies to the rotor chamber of the housing,
wherein one liquid supply of the at least two liquid supplies is always injected into a first compression chamber or expansion chamber and the other of the at least two liquid supplies is injected into a second or subsequent compression chamber or expansion chamber,
wherein the first compression chamber or expansion chamber is a gas chamber that is closed off after a gas inlet of the rotor chamber and said second or subsequent compression chamber or expansion chamber being formed after at least one rotor of the two rotors has rotated one pitch or revolution from the gas inlet,
wherein a first injection point is located on a first helical line formed by a tip of a lobe of a rotor that separates the first compression chamber or expansion chamber from the second or subsequent compression chamber or expansion chamber and a second injection point is located on a second helical line formed by a second tip of a second or subsequent lobe of the rotor that separates the second or subsequent compression chamber of expansion chamber from a successive compression chamber,
wherein the first injection point and the second injection point, further comprises a number of sub-injection points that each open into the first, or second or subsequent compression chamber or expansion chamber, respectively.

Assignees

• Atlas Copco Airpower Nv

Inventors

• Schmitz Christian
• Dom Johan Julia J
• Zwysen Peter Karel Anna-Maria

Classifications

• F04C2270/19

  Temperature · CPC title

• F04C29/021

  Control systems for the circulation of the lubricant · CPC title

• F04C28/06

  specially adapted for stopping, starting, idling or no-load operation · CPC title

• F04C18/16 Primary

  with helical teeth, e.g. chevron-shaped, screw type {(for non-parallel axes of movement F04C18/48)} · CPC title

• F01C21/002

  with control systems for the injection of the fluid · CPC title