JPS5872852A - Stirling cycle refrigerator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a Stirling cycle refrigerator.

Specifically, the present invention relates to a Stirling cycle refrigerator with improved compression capacity.

A conventional Stirling cycle refrigerator has a compression cylinder with a built-in compression piston and an expansion cylinder with a built-in expansion piston coaxially adjacent to each other, and an expansion piston driving iron passes through the compression piston to drive the expansion piston by a drive mechanism. There is a Stirling cycle refrigerator that moves reciprocally in conjunction with the reciprocating movement of a compression piston, and the compressed refrigerant expands via a radiator and a regenerator/expands in the expansion space at the other end of the ring. In a known type of Stirling cycle refrigerator, such as that disclosed in U.S. Pat. The phase is 90° ahead of the stroke.

Therefore, the top dead center of the expansion piston (as seen from the compression operation),
In addition, maximum compression can be obtained near the neutral position of the compression piston, but in this case, a large dead volume of compression space is created at the outer periphery of the expansion piston protruding into the compression 7 cylinder, which has the disadvantage of reducing the refrigerating capacity of the refrigerator. .

An object of the present invention is to provide a Stirling cycle refrigerator that eliminates the above-mentioned drawbacks by reducing the dead volume of the compression space. , the end of the compression cylinder adjacent to the expansion cylinder is closed by a flange through which the expansion stone drive rod is soleled;
A Stirling cycle refrigerator is provided, characterized in that a compression space is formed in a compression cylinder, which is compressed only by the reciprocating motion of a compression piston.

EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the Stirling cycle refrigerator 10 according to the present invention will be described with reference to the accompanying drawings. An expansion piston 12 is fitted into the expansion cylinder 11 so as to be able to reciprocate, and the piston 12 and the inner wall of the cylinder 11 are sealed by a piston cylinder 13 . An intermediate flange 14 and a bottom flange 15 extend radially outward from the side wall of the cylinder 11 . The upper surface of the intermediate flange 14 surrounds the periphery and upper end. An expansion space 18 whose volume changes as the piston 12 reciprocates is formed between the expansion piston 12 and the housing head 16b, and a regenerator 19 filled with a wire mesh is provided between the cylinder 11 and the housing 16. There is.

Intermediate flange 14, bottom flange 15, and outer ring 2
0 constitutes a radiator 21, and the cooling water filled in the vessel penetrates both 7 flanges 14.15 and absorbs heat from the flange 1f22 and flows through the flange 1f22. It absorbs heat from the gas (refrigerant).

The bottom end of the cylinder 11 (i.e. the end of the compression cylinder 29 adjacent to the expansion cylinder 11) is closed by an extension 23 of the bottom 7 runno 15, this closure 23 (fc, 1
:The space between the expansion piston 12 and the compression screw l-724 is the expansion piston 1211! l buffer space 2
5 and a compression space 26 of the compression piston 241111. A rod 27 screwed to the expansion piston 12 passes through the cylinder closed W portion 23 in a sealed state. A gas vent hole 2 is provided in the rod 27 and the expansion piston 12 for venting the gas in the buffer chamber 25.
8 is provided.

The compression piston 24 reciprocates within the compression cylinder 29,
It consists of an upper part 30 that matches the inner diameter of the cylinder 29 and a lower small diameter part 31 whose diameter is smaller than this part, and the center is a through hole 33 through which the rod 27 for driving the expansion piston 12 passes. The lower end of the rod 27 is connected to a cap nut 34 that slides inside the through hole 33.
The spherical journal 37 of the connecting rod 36 is pivotally held by a pair of spherical bearings 35 fitted inside. Bag nuts 34. F7) A notch 38 is provided on one side of 1lj, and a gas vent hole 28 in the rod 27 is provided.
The gas that has passed through is released to the crank chamber 39 below. A pair of bins 40 are provided on the side surface of the lower small diameter portion 31.
are fixed, and the ends of connecting rods 41 are fixed to each bottle 40.

A piston ring (sole material) 24a is fitted on the outer periphery of the upper part 30 of the compression piston 24, and a seal ring 24b for sealing with the rod 27 is fitted in the center of the upper part 30. ing.

A drive device 50 that drives this Stirling cycle refrigerator 10 includes an electric motor 51, a planetary reducer 52 that lowers the rotation speed of the motor 51, and a carrier in which several planetary gears 53 of this planetary reducer 52 are arranged. A crank 54, a crank bin 55 attached to this carrier crank 54,
It consists of a pair of compression piston driving connecting rods 41 having an eccentric wheel 56 mounted on the crank bin 55, and a pair of compression piston driving connecting rods 41 having an eccentric wheel mounted on an eccentric knob 57 on the crank bin 55. The rotation of the motor 50 is
The crank bin 55 is decelerated by the reducer 52 and rotates around the stop shaft C3, and the expansion piston 12 is rotated by the eccentric cam 57.
Therefore, the stroke of the compression piston 24J is advanced by 900.

To explain the operation of the Stalin buzzer one-cycle refrigerator 10 according to the present invention, the compression piston 24 at the bottom dead center in the figure
is raised by the connecting rod 41 and compresses the working gas in the compression space 26. Since the top dead center of the piston 24 coincides with the upper end of the compression cylinder, the dead volume of the compression space 26 is approximately 0.
becomes. The compressed working gas flows into the regenerator 19 and the expansion space 18 through the hole f22 in the radiator 21. After that, the expansion piston 12id descends, the working gas in the regenerator 19 and the expansion space 18 expands, and a low temperature is generated in the regenerator 19. The expansion piston 12 rises after reaching the bottom dead center, and returns the working gas in the expansion space 18 to the compression space 26 through the regenerator 1J and the pipe 22. Freezer 1
0 generates a low temperature in the regenerator 19 by repeating the above cycle.

The structure and operation of the present invention are as described above, and by dividing the space between the expansion piston 12 and the compression piston 24 into closed sections, the dead volume is significantly reduced, the compression ratio is reduced, and the refrigeration output is reduced. rose.

[Brief explanation of drawings]

The accompanying drawing is a side sectional view showing a Stirling cycle refrigerator according to the present invention. 10... Refrigerator 11... Expansion cylinder 12
... Expansion piston 16 ... Housing 18 ... Expansion space 19 ... Regenerator 21 ... Heat radiator
23...Closing part 24...Compression piston 25...
Buffer space 26...Compression space 29...Compression cylinder Applicant Aisin Seiki Co., Ltd. Agent Patent attorney Asami Kato

Claims (1)

[Scope of Claims] A compression cylinder containing a compression piston and an expansion cylinder containing an expansion piston are coaxially adjacent to each other, and an expansion piston driving iron passes through the compression piston, and a drive mechanism drives the expansion piston to the compression piston. In a Stirling cycle refrigerator, the compressed refrigerant is expanded in the expansion space at the other end of the expansion cylinder via a radiator and a regenerator, in which the compressed refrigerant is expanded in the expansion space at the other end of the expansion cylinder. A Stirling cycle refrigerator, characterized in that the expansion piston driving rod is sealed by a flange passing through it, and a compression space is formed in the compression cylinder, which is compressed only according to the reciprocating motion of the compression piston.