HERMETIC COMPRESSOR

• US 20110250082A1
• Filed: 03/31/2011
• Published: 10/13/2011
• Est. Priority Date: 04/13/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Jeonghun, HAN, Jeongmin, Lee, Keunju, An, Jaechan, Seo, Hongseok
• Granted Patent: US 8,858,196 B2
• Time in Patent Office: Days
• US Class Current: 417/410.1
• CPC Class Codes: F01C 21/02 Arrangements of bearings bearing constructions F16C
• CPC Class Codes: F04C 18/356 with vanes reciprocating with respect to the outer member
• CPC Class Codes: F04C 2240/50 Bearings
• CPC Class Codes: F04C 2240/60 Shafts
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 29/0057 for eccentric movement
• CPC Class Codes: F16C 2360/42 Pumps with cylinders or pistons
• CPC Class Codes: Y10S 417/902 Hermetically sealed motor pump unit

Abstract

A compression device a rotor and stator in a case, a shaft coupled to the rotor, and a compressor coupled to the shaft to suction, compress, and discharge refrigerant within the case. At least one bearing is used to support the shaft, and the shaft has a diameter that is 0.114 times equal to or larger than and 0.138 times equal to or smaller than an outer diameter of the stator at at least one reference position.

Claims

1. A compression device comprising:

a case;

a stator within the case;

a rotor within the stator;

a crank shaft coupled to the rotor;

a compressor coupled to the crank shaft to suction and compress a refrigerant and to discharge the compressed refrigerant into an interior of the case; and

at least one bearing to support the crank shaft, the crank shaft having a diameter that is 0.114 times equal to or larger than and 0.138 times equal to or smaller than an outer diameter of the stator at at least one reference position in an axial direction.

2. The device of claim 1, wherein the reference position substantially corresponds to a location where the crank shaft is coupled to the rotor.

3. The device of claim 2, wherein the at least one bearing comprises:

a first bearing, coupled to the compressor, to support a first portion of the crank shaft; and

a second bearing to support a second portion of the crank shaft spaced from the first portion.

4. The device of claim 3, wherein the rotor and stator are located between the first and second portions of the crank shaft.

5. The device of claim 1, further comprising:

an oil storage area within the case,

wherein a passage to guide the oil pumped up from the oil storage area toward the second bearing is included through the crank shaft in the axial direction,

6. The device of claim 1, wherein a difference between the outer diameter of the stator and an interior diameter of the case is less than 10% of the interior diameter of the case.

7. The device of claim 6, wherein the difference between the outer diameter of the stator and the interior diameter of the case is less than 5% of the interior diameter of the case.

8. The device of claim 1, wherein the diameter of the crankshaft is substantially constant from a first end of the stator to a second end of the stator.

9. The device of claim 8, wherein the diameter of the outer diameter of the stator is substantially constant from the first end to the second end of the stator.

10. A compression device comprising:

a case;

a stator within the case;

a rotor within the stator;

a crank shaft coupled to the rotor;

a compressor, coupled to the crank shaft, to suction and compress a refrigerant and to discharge the compressed refrigerant into the case;

a first bearing, coupled to the compressor, to support a first portion of the crank shaft; and

a second bearing to support a second portion of the crank shaft spaced from the first portion, wherein the crank shaft has a diameter that is 0.114 times equal to or larger than and 0.138 times equal to or smaller than an outer diameter of the stator.

11. The compression device of claim 10, wherein the compressor comprises:

a cylinder coupled to the first bearing, the cylinder forming a compression space together with the first bearing;

a rolling piston coupled to the crank shaft to perform an orbiting motion within the compression space of the cylinder; and

a vane to partition the compression space into a suction chamber and a discharge chamber and linearly moving responsive to the orbiting of the rolling piston.

12. The compression device of claim 11, wherein the first bearing includes a plurality of bearing plates coupled to upper and lower sides of the cylinder shielding the compression space.

13. The compression device of claim 10, wherein the second bearing comprises:

a frame coupled to an inner circumferential surface of the case at one side of the stator; and

a housing coupled to the frame to rotatably support the crank shaft,

wherein a plurality of first protrusions are located at an outer circumferential surface of the frame and coupled to the inner circumferential surface of the case, and wherein a plurality of second protrusions are located at an outer circumferential surface of the housing for support at the frame.

14. The compression device of claim 13, wherein a bearing protrusion is located at a center of the housing, and a bearing member is mounted in the bearing protrusion such that the crank shaft is inserted therein to be supported.

15. The compression device of claim 14, wherein a number of the first protrusions equals a number of second protrusions, and wherein the first protrusions and the second protrusions overlap each other.

16. The compression device of claim 11, wherein a passage to guide oil pumped from an oil storage of the case toward the second bearing is included through the crank shaft in an axial direction.

17. A compression device comprising:

a case;

a motor in the case;

a shaft coupled to the motor; and

a compressor coupled to the shaft to compress liquid in the case,

wherein a difference between an outer diameter of the motor and an interior diameter of the case is less than 10% of the interior diameter of the case, and

wherein a diameter of the shaft is 0.114 times equal to or larger than and 0.138 times equal to or smaller than the outer diameter of a stator of the motor at at least one reference position.

18. The compression device of claim 17, wherein the difference between an outer diameter of the stator of the motor and the interior diameter of the case is less than 10% of the interior diameter of the case.

19. The compression device of claim 18, wherein the difference between the outer diameter of the stator of the motor and the interior diameter of the case is less than 5% of the interior diameter of the case.

20. The compression device of claim 17, wherein the diameters of the shaft and stator are substantially constant from a first end of the stator to a second end of the stator.