Hermetic reciprocating compressor

Patent metadata

Field	Value
Publication number	US-9617985-B2
Application number	US-201313869497-A
Country	US
Kind code	B2
Filing date	Apr 24, 2013
Priority date	Apr 25, 2012
Publication date	Apr 11, 2017
Grant date	Apr 11, 2017

Abstract

A compressor having a simplified structure includes a rotation shaft having a spiral groove formed in an outer circumferential surface of the rotation shaft, and a cap member that accommodates a lower portion of the rotation shaft so that the rotation shaft can rotate in the cap member. The cap member may be fixed to one of a stator and a frame such that the cap member does not rotate together with the rotation shaft. Through the simplified structure, oil stored in a sealing case can ascend, and noise caused by rotation of the rotation shaft can be reduced.

First claim

What is claimed is:

1. A compressor, comprising:
a sealing case having a lower portion in which oil is to be stored;
a frame disposed in the sealing case;
a compression mechanism comprising a cylinder and a piston to compress a refrigerant of the cylinder;
an electric motor-operated mechanism comprising a stator fixed to the frame and a rotor that rotates in the stator;
a rotation shaft coupled to an inner side of the rotor that rotates together with the rotor, wherein a pickup portion is disposed in a lower portion of the rotation shaft; and
a cap member to accommodate the pickup portion and configured to guide the oil to be stored in the lower portion of the sealing case to the rotation shaft,
wherein the cap member is disposed at a lower portion of the rotation shaft such that the cap member closely contacts the rotor to prevent a gap from being formed between the rotor and the cap member, and the cap member includes at least one leg portion fixed to at least one of the frame and the stator so that the rotation shaft is rotatable without rotating the cap member.

2. The compressor according to claim 1 , wherein the cap member comprises an accommodation portion having an internal space, of which a top surface is open, so as to accommodate the pickup portion, and the at least one leg portion extends from the accommodation portion in a radial direction and is fixed to the at least one of the frame and the stator.

3. The compressor according to claim 2 , wherein the accommodation portion comprises a lower wall, and sidewalls that extend from the lower wall upward to form the internal space.

4. The compressor according to claim 3 , wherein an opening is formed in the lower wall.

5. The compressor according to claim 3 , wherein, when oil is stored in the lower portion of the sealing case, vibration of an oil level caused by rotation of the rotation shaft is prevented by the sidewalls of the cap member and is not transferred to an outer side of the cap member.

6. The compressor according to claim 2 , wherein the at least one leg portion comprises an extension portion that extends from the accommodation portion in the radial direction, a hook portion that extends from an end of the extension portion upward, and a hanging protrusion formed on the hook portion, and
at least one coupling protrusion corresponding to the hanging protrusion is formed on at least one of the frame and the stator.

7. The compressor according to claim 6 , wherein the at least one leg portion is formed of an elastic material, an angle between the hook portion and the extension portion increases when the hanging protrusion is coupled to the coupling protrusion, and the angle between the hook portion and the extension portion decreases and is restored to a state before the hook portion and the extension portion were coupled to the coupling protrusion.

8. The compressor according to claim 1 , wherein the pickup portion has a spiral screw shape or a flat shape.

9. The compressor according to claim 1 , further comprising a bush member coupled to the outer circumferential surface of the rotation shaft, disposed between the rotor and the cap member and rotatable together with the rotation shaft.

10. The compressor according to claim 9 , wherein the bush member comprises a body having a hollow portion into which the rotation shaft is inserted, and a flange that extends from an end of the body in the radial direction to closely contact the rotor.

11. The compressor according to claim 9 , wherein a groove is formed in an upper outer circumferential surface of the pickup portion, and the bush member covers at least one part of the groove.

12. The compressor according to claim 1 , wherein a groove is formed in an upper outer circumferential surface of the pickup portion, and the cap member covers at least one part of the groove.

13. A compressor, comprising:
a sealing case having a lower portion in which oil is to be stored;
a frame disposed in the sealing case;
a compression mechanism comprising a cylinder and a piston to compress a refrigerant of the cylinder;
an electric motor-operated mechanism comprising a stator fixed to the frame and a rotor that rotates in the stator;
a rotation shaft coupled to an inner side of the rotor that rotates together with the rotor, wherein at least one part of the rotation shaft extends into the lower portion of the sealing case in which the oil is to be stored, and a groove is formed in an outer circumferential surface of the rotation shaft;
a cap member to accommodate the at least one part of the rotation shaft and configured to guide the oil to be stored in the lower portion of the sealing case to the groove; and
a bush member that is coupled to the outer circumferential surface of the rotation shaft between the rotor and the cap member to prevent a gap from being formed between the rotor and the cap member and that rotates together with the rotation shaft,
wherein
the cap member is disposed at a lower portion of the rotation shaft and includes at least one leg portion fixed to at least one of the frame and the stator and comprises an accommodation portion having an internal space, of which a top surface is open, and
a lower body portion of the bush member is inserted through the top surface of the internal space.

14. The compressor according to claim 13 , further comprising a pickup portion which extends into the lower portion of the sealing case in which the oil is to be stored, and the rotation shaft has a spiral shape, and
when oil is stored in the sealing case, the pickup portion and the cap member guide the oil to the groove.

15. A compressor, comprising:
a sealing case having a lower portion in which oil is stored;
a frame accommodated in the sealing case;
a compression mechanism and a piston that to compress a refrigerant of a cylinder of the compression mechanism;
an electric motor-operated mechanism comprising a stator fixed to the frame and a rotor that rotates in the stator;
a rotation shaft coupled to an inner side of the rotor that rotates together with the rotor, wherein at least one part of the rotation shaft is submerged in the oil stored in the sealing case and a groove is formed in an outer circumferential surface of the rotation shaft to allow the oil to ascend; and
a cap member to accommodate the at least one part of the rotation shaft and to guide the oil stored in the lower portion of the sealing case to the groove,
wherein the cap member is disposed at a lower portion of the rotation shaft, closely contacts the rotor, and includes at least one leg portion fixed to at least one of the frame and the stator so that the rotation shaft is rotatable without rotating the cap member.

16. The compressor according to claim 15 , wherein the rotation shaft comprises a pickup portion that is submerged in the oil stored in the sealing case and has a spiral shape, and
the pickup portion and the cap member guide the oil stored in the lower portion of the sealing case to the groove.

17. A compressor, comprising:
a sealing case;
a frame disposed in the sealing case;
a compression mechanism comprising a cylinder and a piston to compress a refrigerant of the cylinder;
an electric motor-operated mechanism comprising a stator fixed to the frame and a rotor that rotates in the stator;
a rotation shaft to rotate together with the rotor to drive a motion of the piston, having a groove formed on an outer circumferential surface of the rotation shaft; and
a cap member configured to guide oil stored in the sealing case to the groove and disposed at

Assignees

• Samsung Electronics Co Ltd

Inventors

• Park Seong Jun

Classifications

• F04B17/03 Primary

  driven by electric motors · CPC title

• F04B39/0284

  Constructional details, e.g. reservoirs in the casing (swash-plate compressors F04B27/0878, F04B27/109) · CPC title

• F04B39/0246

  in the rotating shaft · CPC title

• F04B39/023 Primary

  Hermetic compressors · CPC title

• F04B39/14

  Provisions for readily assembling or disassembling · CPC title