Regenerative refrigerator

Patent metadata

Field	Value
Publication number	US-9765996-B2
Application number	US-201514638688-A
Country	US
Kind code	B2
Filing date	Mar 4, 2015
Priority date	Mar 5, 2014
Publication date	Sep 19, 2017
Grant date	Sep 19, 2017

Abstract

A regenerative refrigerator of a single stage type or a multistage type includes: a cylinder having a cooling stage and a cylinder side wall axially extending from the cooling stage; a displacer having a regenerator provided at the same stage as the cooling stage and a displacer side wall axially extending to face the cylinder side wall, and axially movably disposed in the cylinder; and a low temperature-side gas flow path making a gas expansion space between the displacer and the cooling stage communicate with a low-temperature end of the regenerator and having a gas flow gap between the displacer side wall and the cylinder side wall, and a displacer gas passage making the gas flow gap communicate with the low-temperature end of the regenerator and having a gap-side opening provided further toward a high temperature side than the low-temperature end of the regenerator.

First claim

What is claimed is:

1. A regenerative refrigerator of a single stage type or a multistage type comprising:
a cylinder which is provided with a cooling stage;
a displacer which is provided with a regenerator provided at the same stage as the cooling stage and disposed so as to be able to move in an axial direction in the cylinder; and
a low temperature-side gas flow path which makes a gas expansion space between the displacer and the cooling stage communicate with a low-temperature end of the regenerator,
wherein the cylinder is provided with a cylinder side wall extending in the axial direction from the cooling stage to a high temperature side,
the displacer is provided with a displacer side wall extending to face the cylinder side wall in the axial direction,
the low temperature-side gas flow path is provided with a gas flow gap defined by an outer peripheral surface of the displacer side wall and an inner peripheral surface of the cylinder side wall, and a displacer gas passage which permits a flow of gas between the gas flow gap and the low-temperature end of the regenerator,
the gas flow gap is continuous to the gas expansion space on a low temperature side in the axial direction,
the displacer gas passage is provided in the displacer side wall and has a gap-side opening leading to the gas flow gap in the outer peripheral surface of the displacer side wall, a regenerator-side opening leading to the low temperature end of the regenerator in an inner peripheral surface of the displacer side wall, and a connection path connecting the gap-side opening and the regenerator-side opening, and
in the axial direction, the gap-side opening is closer to the high temperature side than the regenerator-side opening.

2. The regenerative refrigerator according to claim 1 , wherein the gas flow gap is narrower than the displacer gas passage.

3. The regenerative refrigerator according to claim 1 , wherein the regenerative refrigerator of the multistage type is a regenerative refrigerator of a two-stage type which is provided with a first stage which is a high temperature stage, and a second stage which is a low temperature stage, and the displacer gas passage is provided in the second stage.

4. The regenerative refrigerator according to claim 1 , wherein
the displacer is provided with a main body portion having the gap-side opening, and a lid portion having the regenerator-side opening,
the main body portion is provided with a main body threaded portion, and
the lid portion is provided with a lid threaded portion which is screwed to the main body threaded portion.

5. The regenerative refrigerator according to claim 1 , wherein the connection path is in the axial direction.

6. A regenerative refrigerator of a single stage type or a multistage type comprising:
a cylinder which is provided with a cooling stage;
a displacer which is provided with a regenerator provided at the same stage as the cooling stage and disposed so as to be able to move in an axial direction in the cylinder; and
a low temperature-side gas flow path which makes a gas expansion space between the displacer and the cooling stage communicate with a low-temperature end of the regenerator,
wherein the cylinder is provided with a cylinder side wall extending in the axial direction from the cooling stage to a high temperature side,
the displacer is provided with a displacer side wall extending to face the cylinder side wall in the axial direction,
the low temperature-side gas flow path is provided with a gas flow gap defined by an outer peripheral surface of the displacer side wall and an inner peripheral surface of the cylinder side wall, and a displacer gas passage which makes the gas flow gap communicate with the low-temperature end of the regenerator,
the gas flow gap is continuous to the gas expansion space on a low temperature side in the axial direction,
the displacer gas passage has a gap-side opening leading to the gas flow gap in the outer peripheral surface of the displacer side wall, and
a position of the gap-side opening in the axial direction is further toward the high temperature side than a position of the low-temperature end of the regenerator in the axial direction,
wherein the displacer gas passage has a regenerator-side opening leading to the low-temperature end of the regenerator,
the displacer is provided with a main body portion having the gap-side opening, and a lid portion having the regenerator-side opening,
the main body portion is provided with a main body threaded portion, and
the lid portion is provided with a lid threaded portion which is screwed to the main body threaded portion.

Assignees

• Sumitomo Heavy Industries

Inventors

• Matsui Takaaki

Classifications

• F25B9/145 Primary

  pulse-tube cycle · CPC title

• F25B9/14

  characterised by the cycle used, e.g. Stirling cycle · CPC title

• F25B9/10 Primary

  with several cooling stages · CPC title

• F25B9/002 Primary

  characterised by the refrigerant · CPC title