# US 7,611,345 B2 · Structure for preventing axial leakage in scroll compressor

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- Number: US 7,611,345 B2
- Document ID: US7611345B2
- Status: Granted
- Kind: B2
- Application number: 11/965,540
- Filed: 2007-12-27
- Published: 2008-07-03
- Granted: 2009-11-03
- Earliest claimed: 2006-12-29
- Assignees: Industrial Technology Research Institute
- Inventors: Shu-Er Huang; Kun-Yi Liang; Yu-Choung Chang; Chih-Chung Lo
- Web page: https://patentgrep.com/patent/US7611345B2

## CPC

- F04C 27/005: {Axial sealings for working fluid}
- F04C 18/0215: {where only one member is moving}
- F04C 23/008: {Hermetic pumps}
- F04C: ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS (engines F03C); ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS

## Abstract

A scroll type compressor is disclosed. The scroll type compressor includes a housing, a frame, a compartment, a separator, a scroll pairs, a slider, a plurality of compartments, at least a pressure-regulating mechanism, and a guiding element. The compartment in the housing is separated into a high-pressure compartment, a low-pressure compartment, and a middle-pressure compartment. The separator is disposed between the high-pressure compartment and the low-pressure compartment. The separator includes an outlet at the center thereof, and at least a passage through the separator. When the pressure in the high-pressure compartment is less than that in low-pressure compartment, the pressure-regulating mechanism is opened to exhaust pressure from the middle-pressure compartment to the high-pressure compartment.

## Claims

### Claim 1

A structure for preventing axial leakage in scroll compressor comprising:
a housing, comprising a flow inlet and a flow outlet;
a frame, fixed in the housing;
a compartment, disposed in the housing and separated into a high-pressure compartment, a low-pressure compartment, and a middle-pressure compartment between the high-pressure compartment and the low-pressure compartment;
a separator, disposed between the high-pressure compartment and a low-pressure compartment, comprising an outlet at the center of the separator and at least a passage;
a pair of scrolls, comprising a fixed scroll and a orbiting scroll engaged with the fixed scroll between the separator and the frame;
a slider, movably disposed at the center at the top of the fixed scroll;
a first compartment and a second compartment disposed between the fixed scroll and the slider, the first compartment communicating with the middle-pressure compartment through a channel formed in the fixed scroll;
at least a pressure-regulating mechanism, disposed above the passage of the separator; and
a guiding element, disposed in the slider, comprising an air passage connected to the passage of the separator;
wherein the pressure in the high-pressure compartment is less than that in the middle-pressure compartment, the pressure-regulating mechanism opens to exhaust air from the middle-pressure compartment to the high-pressure compartment.

### Claim 2 (depends on 1)

The structure as claimed in claim 1, wherein the pressure-regulating mechanism comprises a valve disposed above the passage, when the pressure in the high-pressure compartment is greater than that in the middle-pressure compartment, the valve seals the passage.

### Claim 3 (depends on 2)

The structure as claimed in claim 2, wherein the pressure-regulating mechanism further comprises a retaining element disposed above the valve.

### Claim 4 (depends on 1)

The structure as claimed in claim 1, wherein the guiding element further comprises a T-shaped element, the passage is installed on the T-shaped element.

### Claim 5 (depends on 4)

The structure as claimed in claim 4, wherein the guiding element further comprises a flexible element for keeping the T-shaped element and the separator sealing.

### Claim 6 (depends on 1)

The structure as claimed in claim 1, wherein the separator comprises a ring pin preventing leakage of the pressurized airflow.

### Claim 7 (depends on 1)

The structure as claimed in claim 1, wherein the fixed scroll and the orbiting scroll further respectively comprise a sealing element.

### Claim 8 (depends on 1)

The structure as claimed in claim 1, wherein the fixed scroll comprises a space at the top of the fixed scroll accommodating the slider.

### Claim 9 (depends on 8)

The structure as claimed in claim 8, wherein the space comprises a first chamber and a second chamber; the first chamber is disposed above the second chamber; and the diameter of the first chamber is greater than the diameter of the second chamber.

### Claim 10 (depends on 8)

The structure as claimed in claim 8, wherein the slider comprises a first portion and a second portion; the first portion is disposed above the second portion; and the diameter of the first portion is greater than the diameter of the second portion.

### Claim 11 (depends on 10)

The structure as claimed in claim 10, wherein the first portion and the second portion further respectively comprise an airtight element disposed on the outer edges of the first portion and the second portion.

### Claim 12 (depends on 11)

The structure as claimed in claim 11, wherein the airtight element comprises an O-ring.

### Claim 13 (depends on 1)

The structure as claimed in claim 1, wherein the slider further comprises a hole connected to the outlet.