Rotary compressor

• US 6,213,732 B1
• Filed: 08/28/1998
• Issued: 04/10/2001
• Est. Priority Date: 08/28/1997
• Status: Expired due to Fees

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Fujio, Katsuharu
• Primary Examiner(s): Dolinar, Andrew M.
• Assistant Examiner(s): Castro, Arnold
• Application Number:
  US09/143,084
• Time in Patent Office: 956 Days
• Field of Search: 417/312, 181/403, 418/11, 418/248
• US Class Current: 417/312
• CPC Class Codes: F04C 18/3564 the surfaces of the inner and outer member, forming the working space, being surfaces of revolution
• CPC Class Codes: F04C 29/065 Noise dampening volumes, e.g. muffler chambers
• CPC Class Codes: F04C 29/068 the silencing means being arranged inside the pump housing
• CPC Class Codes: Y10S 181/403 Refrigerator compresssor muffler

Abstract

A rolling piston type rotary compressor includes a cylindrical cylinder having a motor and a compression unit driven by the motor disposed inside of an enclosed container. A roller is externally fitted to the crank of a drive shaft coupled to the motor for moving along the inner side of the cylinder. Plural blades move in and out of the cylinder so that the leading end may slide on the outer circumference of the roller. This partitions the compression chamber formed by the inner side of the cylinder and the outer circumference of the roller nearly at same intervals. A suction port and a discharge port are disposed in each divided compression chamber, in which a common muffler chamber is disposed between the suction port of each compression chamber and the compressor external suction piping system. Each suction passage from each suction port to the muffler chamber is nearly at a same length. Equal pressure pulsation occurs in each suction passage, the suction efficiency of each compression chamber is equal, the compression torque fluctuation during one revolution of the drive shaft is dispersed, and hence the efficiency of the motor is enhanced and the vibration of the compressor piping system is reduced.

Claims

1. A compressor comprising:

(a) a motor,

(b) compressing means including

(1) a cylinder block having a cylinder with a cylindrical inner side,

(2) a plurality of blades moving back and forth within the cylinder, and

(3) a plurality of compression chambers into which the plurality of blades move, each compression chamber of the plurality of compression chambers having a suction port and a discharge port,

(c) a muffler chamber communicating with each suction port of the plurality of compression chambers,

(d) a plurality of passages disposed between a respective suction port and the muffler chamber, each passage of said plurality of passages being substantially the same length,

(e) a main bearing disposed at a side of the motor, adjacent to the cylinder block, for supporting the drive shaft, and

(f) a subsidiary bearing installed at an opposite side of the motor,

wherein said muffler chamber is disposed at a side of the subsidiary bearing, and each discharge port is disposed at a side of the main bearing.

2. A compressor of claim 1, wherein said each passage is disposed so as to penetrate through the subsidiary bearing in the axial direction.

8. The compressor of claim 1, wherein each of said plurality of passages functions both as i) a suction passage and ii) a discharge passage.

3. A compressor comprising:

(a) a motor,

(b) compressing means including

(1) a cylinder block having a cylinder with a cylindrical inner side,

(2) a plurality of blades moving back and forth within the cylinder, and

(3) a plurality of compression chambers into which the plurality of blades move, each compression chamber of the plurality of compression chambers having a suction port and a discharge port,

(4) a main bearing disposed at a side of the motor, adjacent to the cylinder block, for supporting the drive shaft, and

(5) a subsidiary bearing installed at an opposite side of the motor,

(c) a muffler chamber communicating with each suction port of the plurality of compression chambers,

(d) a plurality of passages disposed between a respective suction port and the muffler chamber, each passage of said plurality of passages being substantially the same length,

wherein the muffler chamber is disposed at a side of the subsidiary bearing, each discharge port is disposed at a side of the main bearing, and each passage penetrates through the wall of the enclosed container and the subsidiary bearing.

9. The compressor of claim 3, wherein each of said plurality of passages functions both as i) a suction passage and ii) a discharge passage.

4. A compressor comprising:

(a) a motor,

(b) compressing means including

(1) a cylinder block having a cylinder with a cylindrical inner side,

(2) a plurality of blades moving back and forth within the cylinder, and

(3) a plurality of compression chambers into which the plurality of blades move, each compression chamber of the plurality of compression chambers having a suction port and a discharge port,

(c) a muffler chamber communicating with each suction port of the plurality of compression chambers,

(d) a plurality of passages disposed between a respective suction port and the muffler chamber, each passage of said plurality of passages being substantially the same length, and

(e) external piping communicating with the muffler chamber wherein a part of the external piping is positioned in the muffler chamber, and an end of the external piping is positioned nearly in the center of the muffler chamber.

10. The compressor of claim 4, wherein each of said plurality of passages functions both as i) a suction passage and ii) a discharge passage.

5. A compressor comprising:

(a) a motor,

(b) compressing means including

(1) a cylinder block having a cylinder with a cylindrical inner side,

(2) a plurality of blades moving back and forth within the cylinder, and

(3) a plurality of compression chambers into which the plurality of blades move, each compression chamber of the plurality of compression chambers having a suction port and a discharge port,

(c) a muffler chamber communicating with each suction port of the plurality of compression chambers,

(d) a plurality of passages disposed between a respective suction port and the muffler chamber, each passage of said plurality of passages being substantially the same length, and

(e) external piping communicating with the muffler chamber wherein an end of the external piping positioned in the muffler chamber is positioned nearly in the center between said each passage.

11. The compressor of claim 5, wherein each of said plurality of passages functions both as i) a suction passage and ii) a discharge passage.

6. A compressor comprising:

(a) a motor,

(b) compressing means including

(1) a cylinder block having a cylinder with a cylindrical inner side,

(2) a plurality of blades moving back and forth within the cylinder, and

(3) a plurality of compression chambers into which the plurality of blades move, each compression chamber of the plurality of compression chambers having a suction port and a discharge port,

(c) a muffler chamber communicating with each suction port of the plurality of compression chambers,

(d) a plurality of passages disposed between a respective suction port and the muffler chamber, each passage of said plurality of passages being substantially the same length, and

roller means connected to a drive shaft coupled to the motor, for moving along the inner side of the cylinder, wherein said plurality of blades have a first blade and a second blade,

wherein said plurality of compression chambers further have

(a) a first compression chamber enclosed by an inner side of the cylinder block, an outer side of the roller means and the first blade, and

(b) a second compression chamber enclosed by the inner side of the cylinder block, the outer side of the roller means and the second blade, and each passage has

(1) a first communication pipe disposed between the first compression chamber and the muffler chamber, and

a second communication pipe disposed between the second compression chamber and the muffler chamber.

7. A compressor of claim 6, wherein the first communication pipe and second communication pipe have a nearly the same length.

12. The compressor of claim 6, wherein each of said plurality of passages functions both as i) a suction passage and ii) a discharge passage.