# US 7,607,899 B2 · Compressor with capacity control

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 7,607,899 B2
- Document ID: US7607899B2
- Status: Granted
- Kind: B2
- Application number: 10/517,602
- Filed: 2003-07-24
- Published: 2006-01-26
- Granted: 2009-10-27
- Earliest claimed: 2002-08-22
- Assignees: Atlas Copco Airpower, Naamloze Vennootschap
- Inventors: Wouter Van Praag; Paul Emmanuel Philomena Verbraeken
- Web page: https://patentgrep.com/patent/US7607899B2

## CPC

- F04C 28/24: characterised by using valves controlling pressure or flow rate, e.g. discharge valves {or unloading valves}(F04C28/10 takes precedence)
- F04B 49/225: {with throttling valves or valves varying the pump inlet opening or the outlet opening}
- F04C 18/16: with helical teeth, e.g. chevron-shaped, screw type {(for non-parallel axes of movement F04C18/48)}
- F04C 28/06: specially adapted for stopping, starting, idling or no-load operation
- F04C 2270/01: Load
- F04C 2270/58: Valve parameters
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)

## Abstract

Compressor containing a pressure regulating system (8) comprising an inlet valve (9); a piston (23) in a cylinder (24) connected thereto; a bridge (14) of this inlet valve (9) with a non-return valve (16) in it, characterized in that the piston (32) is a double-acting piston; the cylinder (24) on the side of the piston (23) turned away from the inlet valve is connected to a part (13) of the rotor chamber (2) situated near the inlet valve (9) via a pipe (28); and the cylinder (26) on the other side of the piston (23) is connected to the above-mentioned part (13) of the rotor chamber (2) and the non-return valve (16) via a pipe (29).

## Claims

### Claim 1

A compressor, containing a compressor element, and comprising: a rotor chamber connected to an inlet pipe and an outlet pipe; a reservoir in communication with the outlet pipe; a pressure regulating system including an inlet valve associated with the inlet pipe; a piston connected to the inlet valve and which is movable in a cylinder to open and close the inlet valve without the use of a spring acting on the piston; a bridge bridging said inlet valve and in which, between the inlet pipe and the rotor chamber, are successively mounted a gas stream limiter and a non-return valve which only admits gas into the rotor chamber; a gas pipe connecting the reservoir to a part of the bridge situated between the gas stream limiter and the non-return valve; and a relief valve associated with said gas pipe, wherein the piston is a double-acting piston which divides the cylinder into first and second closed cylinder chambers; the first cylinder chamber, on a first side of the piston facing away from the inlet valve, is connected to a part of the rotor chamber located near the inlet valve upstream the rotor chamber via a first pipe, wherein the connection is always open; and on a second side of the piston, the second cylinder chamber is connected to a part of the rotor chamber situated near the inlet valve and to the non-return valve via a second pipe.

### Claim 2 (depends on 1)

The compressor according to claim 1, wherein the first pipe connecting the first cylinder chamber on the first side which is turned away from the inlet valve to a part of the rotor chamber situated near the inlet valve forms the connection between the piston and the inlet valve.

### Claim 3 (depends on 2)

The compressor according to claim 2, wherein the connection between the piston and the inlet valve comprises a stem provided with a duct extending over an entire length of the stem.

### Claim 4 (depends on 1)

The compressor according to claim 1, wherein the relief valve comprises a pneumatic valve which is equipped with a spring and which is connected by a pipe which is directly connected to the reservoir and a control line which is also connected to said reservoir via a control valve.

### Claim 5 (depends on 4)

The compressor according to claim 4, wherein the control valve is an electromagnetic valve.

### Claim 6 (depends on 1)

The compressor according to claim 1, wherein the inlet valve includes a housing forming a common housing with the cylinder.