Rotary compressor

Patent metadata

Field	Value
Publication number	US-10590933-B2
Application number	US-201715466863-A
Country	US
Kind code	B2
Filing date	Mar 23, 2017
Priority date	Mar 28, 2016
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

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 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.

Assignees

• Fujitsu General Ltd

Inventors

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

Classifications

• F04C2230/604

  Mounting devices for pumps or compressors · CPC title

• F04C2230/231

  by welding · CPC title

• H02K15/028

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

• F04C23/001

  of similar working principle · CPC title

• F04C23/02

  Pumps characterised by combination with, or adaptation to, specific driving engines or motors · CPC title