JPH0566477U - refrigerator - Google Patents

Abstract

(57) [Summary] [Purpose] Even if the displacer slides back and forth, a load is not applied to the seal, wear of the seal is suppressed, and a refrigerator with a long life is obtained. [Structure] Resonator coil springs 29 and 30 whose seating surfaces are finished in parallel are arranged between the control cylinder 22 and the spring retainer 31 and between the spring retainer and the housing 27, and a displacer supported by the reaction force thereof by applying an initial load. Refrigerator with cold finger 2 having 15. [Effect] Since the displacer is supported by the reaction force of the resonance coil spring, it is possible to eliminate rattling between the control cylinder, the spring retainer, and the housing and the resonance coil spring. It can be supported, and even if the displacer slides back and forth, no load is applied to the seal, and the effect of suppressing wear of the seal is obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to, for example, a Stirling refrigerator for cooling an infrared element or a superconductor to an extremely low temperature, generally 100K or less.

[0002]

[Prior Art]

 FIG. 2 shows a configuration example of a conventional Stirling refrigerator. The Stirling refrigerator shown in FIG. 2 is called a split-type Stirling refrigerator, which is a typical example of the Stirling refrigerator. In FIG. 2, the split Stirling refrigerator is roughly divided into a compressor 1, a cold finger 2, and a connecting pipe 3 connecting them.

The compressor 1 includes a cylinder 4 and a piston 5, and the piston 5 reciprocates in the cylinder 4 driven by an electric motor though not shown in the figure via a connecting rod 6 and a crank 7. Has become. A cylinder head 8 is attached to the upper part of the cylinder 4, and the internal space partitioned by the cylinder head 8 is called a compression chamber. A mechanical member for driving the piston 5 such as the crank 7 is housed in the housing 10, and a space in the housing 10 partitioned from the compression chamber 9 by the piston 5 is called a bulk chamber 11.

The cylinder 4, the cylinder head 8 and the housing 10 are joined to each other so as to maintain airtightness with the outside, and the compression chamber 9 and the bulk chamber 11 inside are pressurized with high pressure such as helium and hydrogen. Working gas is enclosed. A piston ring 12 is attached to a side surface of the piston 5 so that the working gas does not pass through a gap between the piston 5 and the cylinder 4. Further, fins 13 are provided on the outer surface of the cylinder 4 in order to enhance heat radiation to the outside. The above is the configuration of the compressor 1.

On the other hand, the cold finger 2 has a displacer 15 which slidably reciprocates in a cylindrical low temperature cylinder 14. The space inside the low-temperature cylinder 14 is divided into two by the displacer 15, and the space above the displacer 15 is called a low temperature chamber 16 and the space below is called a high temperature chamber 17.

A regenerator 18 and a gas passage hole 19 are provided inside the displacer 15. The low temperature chamber 16 and the high temperature chamber 17 communicate with each other through the regenerator 18 and the gas passage hole 19, The regenerator 18 is filled with a cold storage material 20. A seal 21 is fitted on the side surface of the displacer 15 so that the working gas does not pass through the gap between the low temperature cylinder 14 and the displacer 15. On the lower side of the displacer 15, there is provided a control piston 24 attached to the lower end of the displacer 15, a control chamber 22 surrounded by a control cylinder 22 and a housing 27, and the control piston 24 is provided in the high temperature chamber. It passes through 17 and the control cylinder 22, projects into the control chamber 23, and is supported by a resonance coil spring 28.

A seal 25 is attached to the control cylinder 22 so that the working gas does not pass through the gap between the control cylinder 22 and the control piston 24. Similar to the compressor 1, each chamber of the cold finger 2 is filled with a high-pressure working gas such as helium or hydrogen. The above is the configuration of the cold finger 2.

The compression chamber 9 of the compressor 1 and the high temperature chamber 17 of the cold finger 2 communicate with each other through the connecting pipe 3. Further, the compression chamber 9, the space inside the connecting pipe 3, the low greenhouse 16, the high temperature chamber 17, the regenerator 18, and the gas passage hole 19 communicate with each other, and these chambers are integrated as a whole. It is called the working chamber 26.

The operation of the conventional refrigerator configured as described above will be described. The piston 5 reciprocates in the cylinder 4 to give a sinusoidal wave to the gas pressure in the working chamber 26 from the compression chamber 9 to the low temperature chamber 16. On the other hand, since the volume of the bulk chamber 11 is sufficiently larger than the stroke volume of the piston 5, the internal gas pressure does not change much even when the piston 5 moves back and forth. The seal 25 attached to the control cylinder 22 of the cold finger 2 almost completely seals against the pressure change of a short cycle such as the pressure wave of the gas in the working chamber 27 described above, but in a long time view. Since the sealing is incomplete, the gas pressure in the control chamber 23 is maintained at about the average value of the gas pressure in the working chamber 27.

FIG. 3 to FIG. 6 explain the operating principle of the conventional device through the order of the refrigeration cycle. In the course of the cycle shown in FIG. 3, the piston 5 of the compressor 1 is located below the cylinder 4 and the displacer 15 of the cold finger 2 is located above the cold cylinder 14. During the period from FIG. 3 to FIG. 4, the piston 5 rises to compress the gas in the working chamber 26.

At the time of FIG. 4, the gas pressure in the working chamber 27 is higher than the gas pressure in the control chamber 23, and the downward force generated in the control piston 24 by this differential pressure is due to the static friction of the seals 21 and 25. The displacer 15 begins to move downward due to the force and moves to the lower part of the cold cylinder 14 as shown in FIG. With the movement of the displacer 15, the gas in the high temperature chamber 17 moves to the low temperature chamber 16 through the regenerator 18, and at this time, the regenerator material 20 charged in the regenerator 18 absorbs heat from the passing gas and gas. To lower the temperature.

In the process from FIG. 5 to FIG. 6, the piston 5 of the compressor 1 descends to expand the gas in the working chamber 27, and due to this expansion, the temperature of the gas in the low temperature chamber 16 further drops, and the upper part of the cold finger 2 is expanded. Absorbs heat from the surroundings. This endothermic function plays a role of cooling the object to be cooled as a refrigerator.

Since the pressure in the working chamber 26 decreases due to the expansion of gas, the gas pressure in the control chamber 23 is higher than that in the working chamber 26 at the time of FIG. The force exerted upwardly on the control piston 24 by this pressure difference counteracts the static frictional force of the seals 21 and 25, causing the displacer 15 to start moving upward and to the upper portion of the cold cylinder 14 as shown in FIG. With the movement of the displacer 15, the low-temperature gas in the low-temperature chamber 16 passes through the regenerator 18, stores cold heat in the regenerator material 20 in the regenerator 18, and the gas itself flows into the high-temperature chamber 17 while increasing its temperature. To do. By repeating the above cycle, the refrigeration operation is performed.

[0014]

[Problems to be solved by the device]

 The conventional device as described above has the following problems. When the resonance coil spring 28 is used and the displacer 15 and the housing 27 are mechanically coupled to each other via the control piston 24, rattling occurs between the resonance coil spring 28 and the control piston 24 and the housing 27. 25, the displacer 15 cannot be supported vertically, and when the displacer 15 slides back and forth, load is applied to the seal 25, shortening the life of the seal 25. That is, there was a problem of shortening the life of the refrigerator.

The present invention has been made to solve the above problems, and an object thereof is to support the displacer at a right angle with respect to the seal and not apply a load to the seal even when the displacer slides back and forth.

[0016]

[Means for Solving the Problems]

 In the refrigerator of the present invention, the end face of the control cylinder is parallel to both end faces of the spring retainer and the housing, and the seating surfaces are finished in parallel between the control cylinder end face and the spring retainer and between the spring retainer and the housing. Coil springs are arranged, an initial load is applied to each resonance coil spring, and the displacer is supported by the reaction force.

[0017]

[Action]

 In this invention, since the displacer is supported by the reaction force of the resonance coil spring to which an initial load is applied through the control piston, the rattling between the resonance coil spring and the control piston and the housing causes resonance. It is absorbed by the deflection due to the initial load of the coil spring, and the load direction of the resonance coil spring is always at right angles to the seal and also matches the sliding direction of the displacer. Even if it moves, no load is applied to the seal ring, which suppresses wear and extends the life of the seal.

[0018]

【Example】

 FIG. 1 is a sectional view showing an embodiment of the present invention. The compressor 1 and the connecting pipe 3 are exactly the same as those of the conventional device, and the cold fingers 2 are the end faces of the control cylinder 22 and the end faces of the spring holder 31. , And the housing 27 are parallel to each other, and the resonance spring 29 has a seat surface finished in parallel between the control cylinder 22 and the spring retainer 31 and the resonance spring has a seat surface finished in parallel between the spring retainer 31 and the housing 27. Unlike the conventional device, a coil spring 30 is arranged, and an initial load is applied to the resonance coil springs 29, 30 to support the displacer 15 by its reaction force.

The refrigerator of the present invention has the same principle as that of a conventional refrigerator, but the displacer 15 is supported by the reaction force of the initial load of the resonance coil springs 29 and 30. Since the load directions of the resonance coil springs 29 and 30 are always at right angles to the seals 21 and 25 and coincide with the sliding direction of the displacer 15, the displacer 15 can be perpendicular to the seals 21 and 25. Therefore, the wear of the seals 21 and 25 can be suppressed more than in the conventional device.

Therefore, in the refrigerator of the present invention, since the load is not applied to the seal even when the displacer 15 slides back and forth, wear of the seal can be suppressed and a refrigerator having a long life can be realized.

[0021]

[Effect of the device]

 As described above, the displacer is supported by the reaction force of the initial load of the two resonance coil springs whose seat surfaces are finished in parallel, so that the displacer is perpendicular to the seal and the displacer slides back and forth. Even if the seal moves, no load is applied to the seal, which has the effect of suppressing wear of the seal.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing the structure of a conventional device.

FIG. 3 is a cross-sectional view for explaining the operation principle of a conventional refrigerator.

FIG. 4 is a cross-sectional view for explaining the operation principle of a conventional refrigerator.

FIG. 5 is a cross-sectional view for explaining the operation principle of a conventional refrigerator.

FIG. 6 is a cross-sectional view for explaining the operation principle of a conventional refrigerator.

[Explanation of symbols]

 1 Compressor 2 Cold Finger 3 Connection Pipe 4 Cylinder 5 Piston 8 Cylinder Head 9 Compression Chamber 14 Low Temperature Cylinder 15 Displacer 16 Low Greenhouse 17 High Greenhouse 21 Seal 22 Control Cylinder 23 Control Room 24 Control Piston 25 Seal 27 Housing 29 Resonant Coil Spring 30 Resonance coil spring 31 Spring retainer

Claims (1)

[Scope of utility model registration request] 1. A compressor comprising a cylinder, a cylinder head for closing one end surface of the cylinder, a piston reciprocating in the cylinder, and a compression chamber partitioned by the cylinder, the cylinder head and the piston. An elongated tubular low-temperature cylinder, a displacer that divides the interior of the low-temperature cylinder into a low-temperature chamber and a high-temperature chamber, and reciprocates in the low-temperature cylinder, and a control piston and a control cylinder provided below the displacer. And a housing, a spring retainer attached to a lower end of the control piston, a resonance coil spring disposed between the control cylinder and the spring retainer, and between the spring retainer and the housing, and the low temperature. Gap between the cylinder and the displacer and the control cylinder And a cold finger provided with a seal provided in a gap between the control piston and a control chamber partitioned by the control cylinder and the housing,
In a refrigerator constituted by a connecting pipe connecting the compression chamber of the compressor and a high temperature chamber of the cold finger, as the resonance coil spring, a resonance coil spring having a seat surface finished in parallel is used. A refrigerator characterized by applying an initial load to each resonance coil spring.