TWO-CYLINDER HERMETIC COMPRESSOR

• US 20170248139A1
• Filed: 02/08/2017
• Published: 08/31/2017
• Est. Priority Date: 02/26/2016
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: FURUYA, Shiho, HORIHATA, Hideyuki, SHIIZAKI, Hiraku
• Granted Patent: US 10,273,957 B2
• Time in Patent Office: Days
• CPC Class Codes: F01C 21/02 Arrangements of bearings bearing constructions F16C
• CPC Class Codes: F01C 21/108 with an axial surface, e.g. side plates
• CPC Class Codes: F04C 18/356 with vanes reciprocating with respect to the outer member
• 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 2240/30 Casings or housings
• CPC Class Codes: F04C 2240/40 Electric motor
• CPC Class Codes: F04C 2240/50 Bearings
• CPC Class Codes: F04C 2240/54 Hydrostatic or hydrodynamic bearing assemblies specially adapted for rotary positive displacement pumps or compressors
• CPC Class Codes: F04C 2240/56 Bearing bushings or details thereof
• CPC Class Codes: F04C 2240/60 Shafts
• CPC Class Codes: F04C 2240/601 Shaft flexion
• CPC Class Codes: F04C 2240/605 Shaft sleeves or details thereof
• CPC Class Codes: F04C 23/001 of similar working principle
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 27/008 for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
• CPC Class Codes: F04C 29/0021 Systems for the equilibration of forces acting on the pump interstice adjustment other than by fluid pressure F01C21/102
• CPC Class Codes: F04C 29/0057 for eccentric movement
• CPC Class Codes: F04C 29/0085 Prime movers
• CPC Class Codes: Y10S 417/902 Hermetically sealed motor pump unit

Abstract

In the two-cylinder hermetic compressor, a main bearing is disposed on one surface of a first cylinder, an intermediate plate is disposed on another surface of the first cylinder, the intermediate plate is disposed on one surface of a second cylinder, and an auxiliary bearing is disposed on another surface of the second cylinder. A shaft is constituted by a main shaft portion which has a rotor attached thereto and is supported by the main bearing, a first eccentric portion having a first piston attached thereto, a second eccentric portion having a second piston attached thereto, and an auxiliary shaft portion supported by the auxiliary bearing. A thrust receiving portion is provided on a side of the second eccentric portion facing the auxiliary shaft portion, and the auxiliary bearing is provided with a thrust surface on which the end face of the thrust receiving portion slides while contacting therewith. The thrust surface is provided with a ring groove.

Claims

1. A two-cylinder hermetic compressor comprising:

an electric motor unit and a compression mechanism unit in a sealed container, wherein the electric motor unit and the compression mechanism unit are connected to each other by a shaft,

the electric motor unit includes a stator fixed on an inner surface of the sealed container and a rotor that rotates in the stator,

a first compression mechanism unit and a second compression mechanism unit are provided as the compression mechanism unit,

the first compression mechanism unit includes a first cylinder and a first piston provided in the first cylinder,

the second compression mechanism unit includes a second cylinder and a second piston provided in the second cylinder,

a main bearing is disposed on one surface of the first cylinder and an intermediate plate is disposed on another surface of the first cylinder,

the intermediate plate is disposed on one surface of the second cylinder and an auxiliary bearing is disposed on another surface of the second cylinder,

the shaft includes a main shaft portion to which the rotor is attached and which is supported by the main bearing, a first eccentric portion to which the first piston is mounted, a second eccentric portion to which the second piston is mounted, and an auxiliary shaft portion supported by the auxiliary bearing,

a thrust receiving portion is provided on a side of the second eccentric portion facing the auxiliary shaft portion,

the auxiliary bearing is provided with a thrust surface on which an end face of the thrust receiving portion slides while the end face is contacting the thrust surface, and

the thrust surface is formed with a ring groove.

2. The two-cylinder hermetic compressor according to claim 1, wherein a ring-shaped edge portion formed by the ring groove and the thrust surface is beveled.

3. The two-cylinder hermetic compressor according to claim 2, wherein a ring-shaped edge portion formed by the ring groove and the thrust surface is beveled.

4. The two-cylinder hermetic compressor according to claim 1, wherein an end face of the auxiliary bearing on an inner periphery side with respect to the ring groove is formed to be lower than an end face of the auxiliary bearing on an outer periphery side with respect to the ring groove, and the end face of the auxiliary bearing on the outer periphery side with respect to the ring groove is defined as the thrust surface.

5. The two-cylinder hermetic compressor according to claim 2, wherein an end face of the auxiliary bearing on an inner periphery side with respect to the ring groove is formed to be lower than an end face of the auxiliary bearing on an outer periphery side with respect to the ring groove, and the end face of the auxiliary bearing on the outer periphery side with respect to the ring groove is defined as the thrust surface.

6. The two-cylinder hermetic compressor according to claim 4, wherein a diameter of the auxiliary shaft portion is set smaller than a diameter of the main shaft portion.

7. The two-cylinder hermetic compressor according to claim 5, wherein a diameter of the auxiliary shaft portion is set smaller than a diameter of the main shaft portion.

8. The two-cylinder hermetic compressor according to claim 1, wherein a diameter of the auxiliary shaft portion is set smaller than a diameter of the main shaft portion.

9. The two-cylinder hermetic compressor according to claim 2, wherein a diameter of the auxiliary shaft portion is set smaller than a diameter of the main shaft portion.