Hermetic rotary compressor

Patent metadata

Field	Value
Publication number	US-9828996-B2
Application number	US-201214653041-A
Country	US
Kind code	B2
Filing date	Dec 20, 2012
Priority date	Dec 20, 2012
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

A rotor has at its two axis end portions an upper large-diameter inner circumferential portion and a lower large-diameter inner circumferential portion that have inner diameters larger than the inner diameter of the axially middle portion of the rotor and are offset in the radial direction. A crankshaft has a passageway, which is formed in the crankshaft and allows refrigerant to flow therethrough, and a gas venting hole, which provides communication between the passageway and at least one discharge opening formed in the outer circumferential surface of the crankshaft. The at least one discharge opening is formed at a position facing the inner circumferential surface of the lower large-diameter inner circumferential portion 5 b on the compression unit side.

First claim

The invention claimed is:

1. A hermetic rotary compressor, comprising:
an electric motor that drives a compression unit configured to compress refrigerant gas;
a hermetic container that accommodates the compression unit and the electric motor and contains the refrigerant gas; and
a crankshaft that extends from the compression unit to the electric motor and is provided on a rotor in the electric motor, wherein
the rotor has two large-diameter inner circumferential portions formed at two axis end portions of the rotor, the large-diameter inner circumferential portions include an upper large-diameter inner circumferential portion and a lower large-diameter inner circumferential portion having inner diameters larger than an inner diameter of an axially middle portion of the rotor, the large-diameter inner circumferential portions have inner diameter centers offset with respect to a rotation axis line of the crankshaft in a radial direction,
the crankshaft has a first passageway and a second passageway, the first passageway being formed in the crankshaft and allowing the refrigerant gas to flow through the first passageway, the second passageway providing communication between the first passageway and at least one discharge opening that is formed in an outer circumferential surface of the crankshaft,
the at least one discharge opening jets out the refrigerant gas onto an inner circumferential surface of one of the two large-diameter inner circumferential portions and is formed at a position that faces the inner circumferential surface of the one of the two large-diameter inner circumferential portions,
the one of the two large-diameter inner circumferential portions is the lower large-diameter inner circumferential portion provided on a side of the compression unit,
the second passageway is in communication with the first passageway and penetrates through the crankshaft in the radial direction, and
the at least one discharge opening comprises two openings that are provided in a direction in which the one large-diameter inner circumferential portion is offset and in a direction opposite to the direction in which the one large-diameter inner circumferential portion is offset.

2. A hermetic rotary compressor, comprising:
an electric motor that drives a compression unit configured to compress refrigerant gas;
a hermetic container that accommodates the compression unit and the electric motor and contains the refrigerant gas; and
a crankshaft that extends from the compression unit to the electric motor and is provided on a rotor in the electric motor, wherein
the rotor has two large-diameter inner circumferential portions formed at two axis end portions of the rotor, the large-diameter inner circumferential portions include an upper large-diameter inner circumferential portion and a lower large-diameter inner circumferential portion having inner diameters larger than an inner diameter of an axially middle portion of the rotor, the large-diameter inner circumferential portions have inner diameter centers offset with respect to a rotation axis line of the crankshaft in a radial direction,
the crankshaft has a first passageway and a second passageway, the first passageway being formed in the crankshaft and allowing the refrigerant gas to flow through the first passageway, the second passageway providing communication between the first passageway and at least one discharge opening that is formed in an outer circumferential surface of the crankshaft,
the at least one discharge opening jets out the refrigerant gas onto an inner circumferential surface of one of the two large-diameter inner circumferential portions and is formed at a position that faces the inner circumferential surface of the one of the two large-diameter inner circumferential portions,
the one of the two large-diameter inner circumferential portions is the lower large-diameter inner circumferential portion provided on a side of the compression unit, and
the at least one discharge opening comprises one opening that is provided in a direction opposite to a direction in which the one large-diameter inner circumferential portion is offset.

3. A hermetic rotary compressor, comprising:
an electric motor that drives a compression unit configured to compress refrigerant gas;
a hermetic container that accommodates the compression unit and the electric motor and contains the refrigerant gas; and
a crankshaft that extends from the compression unit to the electric motor and is provided on a rotor in the electric motor, wherein
the rotor has two large-diameter inner circumferential portions formed at two axis end portions of the rotor, the large-diameter inner circumferential portions include an upper large-diameter inner circumferential portion and a lower large-diameter inner circumferential portion having inner diameters larger than an inner diameter of an axially middle portion of the rotor, the large-diameter inner circumferential portions have inner diameter centers offset with respect to a rotation axis line of the crankshaft in a radial direction,
the crankshaft has a first passageway and a second passageway, the first passageway being formed in the crankshaft and allowing the refrigerant gas to flow through the first passageway, the second passageway providing communication between the first passageway and at least one discharge opening that is formed in an outer circumferential surface of the crankshaft,
the at least one discharge opening is formed above an upper end surface of the rotor on an opposite side of the rotor from the compression unit, and
the at least one discharge opening is provided in a direction opposite to a direction in which one of the large-diameter inner circumferential portions as the lower large-diameter inner circumferential portion provided on a side of the compression unit is offset.

Assignees

• Tsuchida Kazuchika
• Kazama Osamu
• Mitsubishi Electric Corp

Inventors

• Tsuchida Kazuchika
• Kazama Osamu

Classifications

• F04C29/0021

  Systems for the equilibration of forces acting on the pump (interstice adjustment other than by fluid pressure F01C21/102) · CPC title

• F04B39/04 Primary

  Measures to avoid lubricant contaminating the pumped fluid · CPC title

• F04C23/008

  Hermetic pumps · CPC title

• F04B39/0094

  crankshaft · CPC title

• F04C15/0088

  Lubrication (of machines or engines in general F01M) · CPC title