Scroll compressor having a fixed scroll pressed in an axial direction against an orbiting scroll

Patent metadata

Field	Value
Publication number	US-10066624-B2
Application number	US-201414787726-A
Country	US
Kind code	B2
Filing date	Apr 28, 2014
Priority date	Apr 30, 2013
Publication date	Sep 4, 2018
Grant date	Sep 4, 2018

Abstract

A scroll compressor of the present invention includes a first discharge port 35 which is in communication with a compression chamber 50, a discharge space 30H which is in communication with the first discharge port 35, a second discharge port 21 which brings the discharge space 30H into communication with a high pressure space 11, a discharge check valve 131 capable of closing the second discharge port 21, a bypass port 36 which brings the compression chamber 50 into communication with the discharge space 30H, and a bypass check valve 121 capable of closing the bypass port 36, the fixed scroll 30 can move in an axial direction of the fixed scroll between the partition plate 20 and the main bearing 60, a high pressure is applied to the discharge space 30H and according to this, the fixed scroll 30 can be pressed against the orbiting scroll 40.

First claim

The invention claimed is:

1. A scroll compressor comprising:
a partition plate for partitioning an interior of a hermetic container into a high pressure space and a low pressure space;
a fixed scroll which is adjacent to the partition plate;
an orbiting scroll which is meshed with the fixed scroll and which forms compression chambers;
a rotation-restraining member for preventing the orbiting scroll from rotating; and
a main bearing for supporting the orbiting scroll, wherein
the fixed scroll, the orbiting scroll, the rotation-restraining member and the main bearing are placed in the low pressure space,
the fixed scroll and the orbiting scroll are placed between the partition plate and the main bearing,
the fixed scroll can move in an axial direction of the fixed scroll between the partition plate and the main bearing,
the scroll compressor further includes
a first discharge port which is formed in the fixed scroll and which is in communication with one of the compression chambers that becomes a high pressure region immediately before compression is completed among the compression chambers,
a discharge space which is formed between the partition plate and the fixed scroll and which is in communication with the first discharge port,
a second discharge port which is formed in the partition plate and which brings the discharge space into communication with the high pressure space,
a discharge check valve capable of closing the second discharge port,
a bypass port which is formed in the fixed scroll and which brings the compression chamber that becomes a high pressure region immediately before compression is completed among the compression chambers into communication with the discharge space, and
a bypass check valve capable of closing the bypass port, and

the fixed scroll is pressed in an axial direction against the orbiting scroll by a pressure of the discharge space.

2. The scroll compressor according to claim 1 , further comprising a ring-shaped, first seal member placed on an outer periphery of the discharge space between the partition plate and the fixed scroll, and
a ring-shaped, second seal member placed on an outer periphery of the first seal member between the partition plate and the fixed scroll, wherein
a pressure in a medium pressure space formed between the first seal member and the second seal member is set lower than the pressure in the discharge space and higher than a pressure in the low pressure space.

3. The scroll compressor according to claim 2 , wherein a first seal diameter of the first seal member is in a range of 10 to 40% of an inner diameter of the hermetic container.

4. The scroll compressor according to claim 2 , wherein a medium pressure port which brings the compression chamber into communication with the medium pressure space is formed in the fixed scroll, and a medium pressure check valve capable of closing the medium pressure port is provided.

5. The scroll compressor according to claim 1 , wherein the bypass port is composed of at least one or more first bypass ports which are in communication with one of the compression chambers formed from an inner wall of a fixed spiral lap of the fixed scroll and an outer wall of an orbiting spiral lap of the orbiting scroll, and at least one or more second bypass ports which are in communication with an other compression chamber formed from an outer wall of the fixed spiral lap and an inner wall of the orbiting spiral lap.

6. The scroll compressor according to claim 1 , wherein the bypass check valve capable of closing the bypass port is a reed valve type check valve.

7. The scroll compressor according to claim 6 , wherein the reed valve type check valve is one reed valve capable of closing both a first bypass port and a second bypass port.

8. The scroll compressor according to claim 1 , wherein a spring constant of the discharge check valve is larger than that of the bypass check valve.

9. The scroll compressor according claim 1 , wherein an average flow path area of the second discharge port is larger than that of the first discharge port.

10. The scroll compressor according to claim 1 , wherein a port inlet of the second discharge port on the side of the discharge space is chamfered.

11. The scroll compressor according to claim 1 , wherein the orbiting scroll is displaced in a centrifugal direction by a centrifugal force in orbiting motion at the time of operation and according to this, the orbiting scroll is in contact with the fixed scroll.

12. The scroll compressor according to claim 1 , further comprising an electric element which is formed from a rotor fixed to a rotation shaft for driving the orbiting scroll, and from a stator fixed to the hermetic container, and which is placed in the low pressure space, wherein the electric element includes inverter control capable of controlling the number of rotations of the rotation shaft.

13. The scroll compressor according to claim 1 , wherein an inner wall of a fixed spiral lap of the fixed scroll is formed up to a location adjacent to an ending-end of an orbiting spiral lap of the orbiting scroll opposite a center line and according to this, a containment capacity of one of the compression chambers formed from the inner wall of the fixed spiral lap and an outer wall of the orbiting spiral lap, and a containment capacity of an other compression chamber formed from an outer wall of the fixed spiral lap and an inner wall of the orbiting spiral lap are made different from each other.

14. The scroll compressor according to claim 1 , wherein a thickness between an inner wall and an outer wall of a fixed spiral lap of the fixed scroll and a thickness between an inner wall and an outer wall of an orbiting spiral lap of the orbiting scroll are gradually reduced from spiral-starting ends toward ending-ends of the fixed spiral lap and the orbiting spiral lap.

15. The scroll compressor according to claim 1 , further comprising
a bearing-side concave portion formed in an upper surface of the main bearing,
a scroll-side concave portion formed in a lower surface of the fixed scroll, and
a columnar member having a lower end inserted into the bearing-side concave portion and an upper end inserted into the scroll-side concave portion, wherein
the columnar member can axially slide with at least one of the bearing-side concave portion and the scroll-side concave portion, thereby guiding the fixed scroll in the axial direction between the partition plate and the main bearing.

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Ogata Takeshi
• Imai Yusuke
• Yamada Sadayuki
• Shintaku Hidenobu
• Sakuda Atsushi
• Morimoto Takashi

Classifications

• F04C23/008

  Hermetic pumps · CPC title

• F01C17/066

  with an intermediate piece sliding along perpendicular axes, e.g. Oldham coupling · CPC title

• F04C29/0085

  Prime movers · CPC title

• F04C27/008

  for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine · CPC title

• F04C29/128

  of the elastic type, e.g. reed valves · CPC title