Rotary compressor with oiling mechanism

• US 9,157,437 B2
• Filed: 03/11/2013
• Issued: 10/13/2015
• Est. Priority Date: 03/27/2012
• Status: Active Grant

• Current Assignee: Fujitsu General Company Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fujitsu General Company Limited (Fujifilm Holdings Corporation)
• Inventors: Morozumi, Naoya, Yahaba, Shingo
• Primary Examiner(s): Denion, Thomas
• Assistant Examiner(s): Hu, Xiaoting
• Application Number:
  US13/794,422
• Publication Number:
  US 20130259725A1
• Time in Patent Office: 946 Days
• Field of Search: 418/83, 418/88, 418/91, 418/94, 418/98, 418/55.6, 418/64, 418/156, 298/880.25, 184/27.4, 184/31, 184/6.16, 184/6.18, 184/6.11
• US Class Current: 1/1
• CPC Class Codes: F04C 18/00 Rotary-piston pumps specially adapted for elastic fluids with fluid ring or the like F04C19/00; rotary-piston pumps in which the working-fluid is exclusively displaced by one or more reciprocating pistons F04B
• 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 2230/60 Assembly methods
• CPC Class Codes: F04C 2240/603 with internal channels for fluid distribution, e.g. hollow shaft
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: F04C 29/023 Lubricant distribution through a hollow driving shaft F04C29/025 takes precedence
• CPC Class Codes: F04C 29/025 using a lubricant pump
• CPC Class Codes: F16N 7/366 with feed by pumping action of a vertical shaft of the machine

Abstract

A rotary compressor includes an oiling mechanism that contains a vertical fitting hole formed on a countershaft portion in the lower part of the rotating shaft, and an oil pipe having an inlet port at the lower end and an opening at the upper end. The upper part of the oil pipe is press-fitted into the vertical fitting hole. The oiling mechanism further contains a pump vane having a vane portion and a base portion. The vane portion is twisting processed and inserted into the vertical oil hole to provide a space. The base portion is fixed into the lower part of the oil pipe that has an inner diameter smaller than the width thereof.

Claims

1. A rotary compressor comprising:

a hermetically-sealed compressor housing that includes a refrigerant outlet in the upper part thereof and a refrigerant inlet in the lower part thereof, and retains lubricating oil in the lower part thereof;

a compressing unit that is placed in the lower part of the compressor housing and compresses a refrigerant sucked through the refrigerant inlet to discharge the compressed refrigerant through the refrigerant outlet;

a motor that is placed in the upper part of the compressor housing and includes a rotating shaft connected to the compressing unit to drive the compressing unit via the rotating shaft, the rotating shaft having a vertical oil hole and a lateral oil hole for supplying the lubricating oil; and

an oiling mechanism that supplies the lubricating oil to the compressing unit through the vertical oil hole and the lateral oil hole,

wherein the oiling mechanism includes;

a vertical fitting hole that is formed on a countershaft portion in the lower part of the rotating shaft;

an oil pipe that has an inlet port at the lower end and an opening at an upper end, an upper part of the oil pipe being press-fitted into the vertical fitting hole; and

a pump vane formed of an elongate steel plate, the pump vane including a vane portion and a base portion, the vane portion having a 180-degree twisted shape, the base portion arranged at one end of the pump vane and having a width wider than a width of the vane portion, the vane portion and the base portion having substantially equal thickness, wherein the with of the vane portion is smaller than an inner diameter of the oil pipe and an inner diameter of the vertical oil hole, and the width of the base portion is slight;

y wider than the inner diameter of the oil pipe for interference fit, and the pump vane is arranged in the oil pipe such that the base portion is fixed in a lower part of the oil pipe and the vane portion is disposed in the vertical oil hole, and that a space is formed between the vane portion and the oil pipe,

whereby the countershaft portion is not deformed due to the deformation of the oil pipe.

2. The rotary compressor as recited in claim 1, wherein the vertical fitting hole has an inner diameter that is larger than an inner diameter of the vertical oil hole.

3. The rotary compressor as recited in claim 1, wherein the oil pipe is formed of a material that is softer than the material of the rotating shaft.

4. The rotary compressor as recited in claim 3, wherein the material of the oil pipe is either copper or aluminum.

5. The rotary compressor as recited in claim 1, wherein the pump vane is formed of a material that is harder than the material of the oil pipe.

6. The rotary compressor as recited in claim 1, wherein the oil pipe has an outer diameter that is larger than the inner diameter of the vertical fitting hole.