# US 7,607,905 B2 · Fluid compressing system having oil-releasing port being between oil chamber and oil-adjusting tank for returning oil

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- Number: US 7,607,905 B2
- Document ID: US7607905B2
- Status: Granted
- Kind: B2
- Application number: 12/006,509
- Filed: 2008-01-03
- Published: 2008-07-17
- Granted: 2009-10-27
- Earliest claimed: 2007-01-11
- Inventors: Szu-Fu Shen
- Web page: https://patentgrep.com/patent/US7607905B2

## CPC

- F04C 23/008: {Hermetic pumps}
- F04C 29/02: Lubrication (of machines or engines in general F01M); Lubricant separation (separation in general B01D)
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

## Abstract

A fluid compressing system includes: a rotary compressor including a housing defining an oil chamber and an oil-releasing port in fluid communication with the oil chamber; a discharging pipeline connected to the housing for passage of a high pressurized fluid therethrough; an oil-adjusting tank connected to the discharging pipeline and the oil-releasing port for receiving lubricant oil from the oil chamber so as to alleviate oil swirling in the oil chamber; an oil filter connected to the discharging pipeline for separating the lubricant oil from the high pressurized fluid; and a first capillary connected to the oil filter and the housing for recycling filtered lubricant oil from the oil filter into the oil chamber.

## Claims

### Claim 1

A fluid compressing system comprising:
a rotary compressor including a housing, a cylinder disposed in said housing, a rotary shaft disposed rotatably in said housing and extending through said cylinder, and a roller disposed eccentrically in said cylinder and secured to said rotary shaft, said housing defining an oil chamber adapted to receive a lubricant oil therein, a suction port in fluid communication with an interior of said cylinder, a discharging port in fluid communication with the interior of said cylinder, and an oil-releasing port in fluid communication with said oil chamber;
a discharging pipeline connected to said discharging port for passage of a high pressurized fluid discharged from said discharging port therethrough;
an oil-adjusting tank connected to said discharging pipeline and said oil-releasing port for receiving the lubricant oil from said oil chamber so as to alleviate oil swirling in said oil chamber upon rotation of said rotary shaft;
an oil filter connected to said discharging pipeline for separating the lubricant oil from the high pressurized fluid; and
a first capillary connected to said oil filter and said suction port for recycling filtered lubricant oil from said oil filter into said oil chamber.

### Claim 2 (depends on 1)

The fluid compressing system of claim 1, wherein said oil-releasing port is adapted to be disposed adjacent to a liquid level of the lubricant oil, said oil-adjusting tank being disposed above said oil-releasing port so as to permit return of accumulated lubricant oil in said oil-adjusting tank into said oil chamber when rotation of said rotary shaft is stopped.

### Claim 3 (depends on 1)

The fluid compressing system of claim 1, further comprising a cooling device disposed downstream of and connected to said oil filter for cooling the high pressurized fluid passing therethrough.

### Claim 4 (depends on 3)

The fluid compressing system of claim 3, further comprising a fluid-storing tank and a second capillary disposed downstream of said cooling device and interconnecting said fluid-storing tank and said cooling device so as to permit flow of cooled fluid from said cooling device into said fluid-storing tank.

### Claim 5 (depends on 4)

The fluid compressing system of claim 4, further comprising a suction pipeline connected to said suction port, and a third capillary interconnecting said suction pipeline and said fluid-storing tank for controlling flow of the cooled fluid from said cooling device into said fluid-storing tank.