Rotary compressor

• US 10,590,933 B2
• Filed: 03/23/2017
• Issued: 03/17/2020
• Est. Priority Date: 03/28/2016
• Status: Active Grant

• Current Assignee: Fujitsu General Company Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fujitsu General Company Limited (Fujifilm Holdings Corporation)
• Inventors: Komai, Yuji, Onomura, Masayuki, Fukuda, Tetsuo, Morozumi, Naoya
• Primary Examiner(s): Bobish, Christopher S
• Application Number:
  US15/466,863
• Publication Number:
  US 20170276135A1
• Time in Patent Office: 1,090 Days
• Field of Search: 4174103, 417902
• CPC Class Codes: F04C 18/356 with vanes reciprocating with respect to the outer member
• CPC Class Codes: F04C 2230/231 by welding
• CPC Class Codes: F04C 2230/604 Mounting devices for pumps or compressors
• CPC Class Codes: F04C 2240/30 Casings or housings
• CPC Class Codes: F04C 2240/40 Electric motor
• CPC Class Codes: F04C 23/008 Hermetic pumps
• CPC Class Codes: H02K 15/028 for fastening to casing or support, respectively to shaft or hub

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.

Claims

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 an 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

the stator includes metal plates stacked in an axial direction of the rotation shaft,

the metal plates each have a portion deformed in a thickness direction of each metal plate as a caulked joint portion, and a concave portion at a periphery of each metal plate, a position of the concave portion corresponding to the caulked joint portion,

adjacent metal plates of the metal plates are joined together by using caulked joint portions of the adjacent metal plates to stack the adjacent metal plates in the axial direction in order to form the stator,

an outer circumferential portion of the stator includes an elongated concave portion and an oil groove for lubricant oil to flow in the axial direction, and is fixed to an inner circumferential portion of the compressor housing in a transition fit state, the elongated concave portion comprising the concave portion of each metal plate,

a weld portion joins the elongated concave portion and the inner circumferential portion of the compressor housing together, and

the elongated concave portion is smaller than the weld portion at a cross section perpendicular to the axial direction.

2. The rotary compressor according to claim 1, wherein the elongated concave portion is formed across the stator in the axial direction.

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

d≤

0.3 mm.

4. The rotary compressor according to claim 3, wherein a thickness t of a portion of the compressor housing at which the weld portion is provided satisfies a relationship of 2.0 mm≤

t≤

4.0 mm.

5. The rotary compressor according to claim 1, wherein

the concave portion of each metal plate includes a plurality of concave portions,

the elongated concave portion of the stator includes a plurality of elongated concave portions which are provided at an interval in a circumferential direction of the stator and the plurality of elongated concave portions are provided across the stator in the axial direction, and

the weld portion includes a plurality of spot-like shaped weld portions disposed at an equal interval in a circumferential direction of the compressor housing, and positions of the weld portions differ from each other in relation to the axial direction.

6. The rotary compressor according to claim 1, wherein

a depth of the elongated concave portion is smaller than a thickness of the caulked joint portion in a radial direction of the stator.

7. 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 an 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

the stator includes metal plates stacked in an axial direction of the rotation shaft,

the metal plates each have a portion deformed in a thickness direction of each metal plate as a caulked joint portion, and a concave portion at a periphery of each metal plate, a position of the concave portion corresponding to the caulked joint portion,

adjacent metal plates of the metal plates are joined together by using caulked joint portions of the adjacent metal plates to stack the adjacent metal plate in the axial direction in order to form the stator,

an outer circumferential portion of the stator includes an elongated concave portion and an oil groove for lubricant oil to flow in the axial direction, and is fixed to an inner circumferential portion of the compressor housing in a transition fit state, the elongated concave portion comprising the concave portion of each metal plate,

a weld portion joins the elongated concave portion and the inner circumferential portion of the compressor housing together, and

a depth of the elongated concave portion is smaller than a thickness of the caulked joint portion in a radial direction of the stator.