Rotary compressor

Patent metadata

Field	Value
Publication number	US-2017276135-A1
Application number	US-201715466863-A
Country	US
Kind code	A1
Filing date	Mar 23, 2017
Priority date	Mar 28, 2016
Publication date	Sep 28, 2017
Grant date	—

Abstract

A rotary compressor including a cylindrical compressor housing provided with an inlet unit of a refrigerant and a discharging unit of the refrigerant, a compressing unit which is disposed inside the compressor housing and includes a cylinder and a piston for compressing the refrigerant sucked in from the inlet portion, a rotation shaft provided with the piston of the compressing unit, and a motor which includes a cylindrical stator and a rotor that is provided on another end side of the rotation shaft and that rotates inside the stator, and which drives the compressing unit via the rotation shaft, in which an outer circumferential portion of the stator includes a concave portion and is fixed to an inner circumferential portion of the compressor housing in a transition fit state, and in which the compressor housing includes a weld portion which is joined to the concave portion of the stator.

First claim

What is claimed is:

1 . A rotary compressor comprising:
a cylindrical compressor housing which is provided with an inlet unit of a refrigerant and a discharging unit of the refrigerant; a compressing unit which is disposed inside the compressor housing and which includes a cylinder and a piston for compressing the refrigerant that is sucked in from the inlet portion; a rotation shaft which is provided with the piston of the compressing unit; a bearing unit which is fixed to an inner portion of the compressor housing and which supports one end side of the rotation shaft to rotate freely; and a motor which includes a cylindrical stator and a rotor that is provided on another end side of the rotation shaft and that rotates inside the stator, and which drives the compressing unit via the rotation shaft, wherein an outer circumferential portion of the stator includes a concave portion and is fixed to an inner circumferential portion of the compressor housing in a transition fit state, and wherein the compressor housing includes a weld portion which is joined to the concave portion of the stator.

2 . The rotary compressor according to claim 1 ,
wherein the stator includes a plurality of metal plates which are stacked in an axial direction of the rotation shaft, wherein a caulked joint portion at which the adjacent metal plates are joined to each other in a stacking direction is deformed in a thickness direction of the metal plates and is provided on the plurality of metal plates, and wherein the concave portion is formed in a position corresponding to the caulked joint portion in a radial direction of the plurality of metal plates.

3 . The rotary compressor according to claim 2 ,
wherein the concave portion is formed across the stator in an axial direction of the stator.

4 . The rotary compressor according to claim 1 ,
wherein a depth d of the concave portion in the radial direction of the stator satisfies a relationship of 0<d≦0.3 mm.

5 . The rotary compressor according to claim 4 ,
wherein a thickness t of a portion of the compressor housing to which an outer circumferential portion of the stator is fixed in the transition fit state satisfies a relationship of 2.0 mm≦t≦4.0 mm.

6 . The rotary compressor according to claim 1 ,
wherein the stator includes a plurality of the concave portions which are provided at an interval in a circumferential direction of the stator and the plurality of concave portions are provided across the stator in an axial direction of the stator, and wherein a plurality of the weld portions are disposed at an equal interval in a circumferential direction of the compressor housing, and the positions of the weld portions differ from each other in relation to an axial direction of the compressor housing.

Assignees

• Fujitsu General Ltd

Inventors

• Komai Yuji
• Onomura Masayuki
• Fukuda Tetsuo
• Morozumi Naoya

Classifications

• F04C2230/231

  by welding · CPC title

• F04C2230/604

  Mounting devices for pumps or compressors · CPC title

• F04C2240/40

  Electric motor · CPC title

• H02K15/028

  Fastening stator or rotor bodies to casings, supports, shafts or hubs · CPC title

• F04C18/3562 Primary

  the inner and outer member being in contact along one line or continuous surfaces substantially parallel to the axis of rotation · CPC title