JP2003161540A - Drive spring part connecting structure for refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive spring part connecting structure for refrigerator reduced in cost, improved in assembling property, and extended in life by canceling the working force from a coil spring 19 to a plate spring 17 to suppress the stress concentration to the plate spring 17, ensuring a necessary spring constant in a drive part 28, and allowing the practical use of a structure using both the plate spring 17 and the coil spring 19. <P>SOLUTION: In this drive spring part connecting structure for refrigerator having a spring connecting part 43 for connecting the plate spring 17 to the coil spring 19, attention is paid to the cutting of the trosional working force from the coil spring 19 to the plate spring 17 and to the providing of a bearing 44 such as thrust bearing having a rotating mechanism on the spring connecting part 43. The bearing 44 is provided between the plate spring 17 and the coil spring 19 in the spring connecting part 43. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive spring connecting structure for a refrigerator, and more particularly to a Stirling refrigerator for connecting a drive spring connecting a gas compressor to generate refrigeration. is there.

[0002]

2. Description of the Related Art In Stirling refrigerators and other refrigerators that produce refrigeration by compressing and expanding a refrigerant gas such as helium gas by the interaction of a cylinder and a piston, a leaf spring is used as a drive unit for driving the cylinder and the piston. There is one using. For example, there is JP-A-5-215423. An outline will be given based on FIG. FIG. 2 is a cross-sectional view of the Stirling refrigerator 1 proposed by the present applicant, showing the Stirling refrigerator 1.
Has a gas compressor 2 and a cold head 3.
However, the gas compressor 2 has a left-right symmetrical configuration,
Only a part (right half) is shown in the figure and will be described below.

The gas compressor 2 is for generating a refrigeration in the cold head 3 by performing a compression supply action and a suction expansion action of the refrigerant to the cold head 3, and a compressor case 4, an intermediate header 5, It has a piston 6 formed on the intermediate header 5, a yoke 7, a cylinder 8 attached to the yoke 7, a drive spring portion 9, an annular permanent magnet 10, and an annular electromagnetic coil 11.

The compressor case 4 accommodates therein an intermediate header 5, a piston 6, a yoke 7, a cylinder 8, a drive spring portion 9, a permanent magnet 10 and an electromagnetic coil 11.

The intermediate header 5 has a supporting portion 12 in the vertical and vertical directions in FIG. 2, and a piston 6 is formed substantially in the lateral direction of the center thereof. Helium gas is formed in the central portion of the piston 6 and the supporting portion 12. A gas flow path 13 for a refrigerant such as is formed.

The piston 6 is opposed to the cylinder head 14, a seal member 15 is provided on the outer peripheral surface thereof, and a compression expansion chamber is formed between the cylinder 8 and the cylinder head 14 integrally attached to the cylinder 8. 16 is formed. The compression / expansion chamber 16 communicates with the gas flow path 13. The cylinder 8 can move integrally with the electromagnetic coil 11.

The yoke 7 is a member made of, for example, iron for forming a magnetic path, and has a driving spring portion 9 (a leaf spring 17,
The outer peripheral portion (described later) and the permanent magnet 10 are attached.

A piston 6 is inserted in the cylinder 8 so as to be relatively movable in the axial direction, and the cylinder 8 can reciprocate in the axial direction with respect to the piston 6 in a fixed state. As the drive type of the gas compressor 2, a piston drive type for moving the piston 6 and a cylinder 8 are used.
There is a cylinder drive type that moves the
It is a cylinder drive type.

The drive spring portion 9 is composed of two pairs of circular leaf springs 17 and the leaf spring 1 located outside (on the right side in FIG. 2).
A coil spring 19 connected to the spring connecting portion 18
And. In the past, in order to secure a necessary driving force or spring constant, only the leaf spring 17 was used and a plurality of these were laminated, but a coil spring 19 is further provided to obtain the spring constant. That is, in order to obtain a necessary spring constant according to the weight of the drive spring portion 9 or the drive portion 28, which will be described later, which varies depending on the refrigerating capacity of the Stirling refrigerator 1, it is necessary to change the number of stacked layers only with the leaf springs 17. Although a lot of time was spent on assembling the refrigerator 1, it is intended to supplement the spring constant and improve the assemblability by using the coil spring 19 together.

The leaf spring 17 is made of a conductive and elastic metal material, and the outer peripheral portion thereof is attached to the yoke 7 by a mounting bolt 20, and the inner peripheral portion thereof is attached by the mounting bolt 20. In the laminated portion of the leaf springs, a plurality of winding slit leaf springs 17A on the inner side and one lead wire connecting leaf spring 17B on the outer side are formed.

The coil spring 19 includes a first spring seat 21.
And the second spring seat 22 are arranged between them.
The spring connecting portion 18 is composed of the cylinder head 14, the first spring seat 21, and the connecting bolt 23. By tightening the connecting bolt 23 to the first spring seat 21, the cylinder head 14 and the yoke 7, that is, the inner peripheral portion of the plate spring 17 and the coil spring 19 are integrated. The second spring seat 22 is fixed to a conical cover member 25 by a fixing bolt 24, and the cover member 25 is fixed to the yoke 7 on the outer peripheral portion of the leaf spring 17 by a mounting bolt 20. ing.

The winding slit leaf spring 17A and the lead wire connecting leaf spring 17B, in particular, the winding slit leaf spring 17A having a plurality of curved slits (not shown) extending from the outer peripheral side toward the center. Elastic force of the coil spring 1 connected to the leaf spring 17 and the spring connecting portion 18
By the elastic force of 9, the cylinder 8 and the electromagnetic coil 11
Is supported so as to be reciprocable in the axial direction.

The permanent magnet 10 and the electromagnetic coil 11 constitute a linear motor and are arranged so as to face each other, and the leads soldered to the lead wire connecting pieces 26 of the lead wire connecting leaf spring 17B. An alternating current having a predetermined frequency can be supplied to the electromagnetic coil 11 via the wire 27. Together with the permanent magnet 10 and the electromagnetic coil 11, the drive spring portion 9, the piston 6 and the cylinder 8 constitute a drive portion 28.
Generate the relative motion of. That is, the permanent magnet 10 and the electromagnetic coil 11 are relatively axially driven by flowing an alternating current of a predetermined frequency in the electromagnetic coil 11 and by the elastic repulsive force of the leaf spring 17 and the coil spring 19, thereby causing the piston 6 and The relative movement of the cylinder 8 is generated to raise and lower the pressure of the refrigerant in the compression expansion chamber 16 and supply the pressure change of the refrigerant to the cold head 3 side from the gas flow path 13 via the gas supply pipe 29 at a predetermined timing. , Causes the cold head 3 to freeze.

That is, the cold head 3 includes a cylinder 30 and a displacer 32 containing a regenerator material 31.
(Piston) and spring member 33 are provided, and the reverse Stirling cycle is executed in accordance with the supply (compression expansion) of the refrigerants whose phases are shifted and the reciprocating movement of the displacer 32 to generate the freezing. As the spring member 33, not only the leaf spring 17 or the coil spring 19 but also the same drive spring portion 9 as described above can be adopted. Further, the cold head 3 may have a linear motor similar to that provided in the gas compressor 2.

In the Stirling refrigerator 1 having such a structure, the cylinder 8 is reciprocated by the driving force of the driving portion 28, that is, the driving spring portion 9 to compress and expand the refrigerant gas. Note that the drive unit 28 may be supported by the leaf spring 17 as one measure for extending the life of the Stirling refrigerator 1. As described above, the function of the leaf spring 17 is to support the drive unit 28 and to secure a spring constant for its synchronization. However, in order to secure the spring constant until the drive unit 28 is synchronized only with the leaf springs 17, the number of leaf springs 17 is very large (for example, 40 to 60 for one gas compressor 2). However, the combined use of the leaf spring 17 and the coil spring 19 has the following problems.

That is, since the motion characteristic between the leaf spring 17 and the coil spring 19 in the spring connecting portion 18 is not taken into consideration, there is a problem that the twisting force of the coil spring 19 acts on the leaf spring 17. Specifically, the leaf spring 1
7 is required to rotate freely about its expansion / contraction axis (axial direction of piston 6 or cylinder 8),
Since the spring connecting portion 18 is integrally connected to the coil spring 19, there is actually no degree of freedom in the rotation direction, and the maximum concentrated stress applied to the leaf spring 17 is increased by about 3 times. Shorter life, Stirling refrigerator 1
However, there is a problem that it is not possible to extend the life of the.

[0017]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and improves the reliability, durability, and assemblability, and at the same time, a refrigerating machine capable of securing a necessary spring constant in a drive unit. An object is to provide a drive spring portion connection structure in a machine.

It is another object of the present invention to provide a drive spring portion connecting structure in a refrigerator, which can extend the life of the leaf spring in the drive spring portion.

Another object of the present invention is to provide a drive spring portion connecting structure in a refrigerator in which the acting force from the coil spring to the leaf spring can be canceled to suppress the stress concentration on the leaf spring.

It is another object of the present invention to provide a drive spring portion connecting structure in a refrigerator, which enables the practical use of the structure in which the leaf spring and the coil spring are used together in the drive portion.

Another object of the present invention is to provide a drive spring portion connecting structure in a refrigerator, which employs a leaf spring and a coil spring in the drive portion to reduce the cost and improve the assemblability.

[0022]

That is, the present invention focuses on cutting off the twisting action force from the coil spring to the leaf spring, and for that purpose, providing a bearing such as a thrust bearing having a rotation mechanism at the spring connecting portion. In a refrigerator that has a drive spring portion composed of a leaf spring and a coil spring, and uses the elastic force of the drive spring portion to compress and expand the refrigerant to generate freezing, the outer peripheral portion of the leaf spring is A drive spring part connection structure in a refrigerator having a yoke to be fixed and a spring connection part that is provided on an inner peripheral part of the plate spring and connects the plate spring and the coil spring to each other. A drive spring portion connection structure in a refrigerator, characterized in that a bearing is provided between the leaf spring and the coil spring.

The bearing can integrate the movement of the leaf spring and the coil spring in the driving direction, and can move them independently of each other in a plane perpendicular to the driving direction. be able to.

The bearing may be a thrust bearing having a rotating structure.

The present invention can be applied to both a piston drive type for moving a piston and a cylinder drive type for moving a cylinder in a gas compressor, and can also be applied to a cold head.

In the drive spring portion connecting structure in the refrigerator according to the present invention, a torsion acting force from the coil spring to the leaf spring is provided by providing a bearing such as a thrust bearing having a rotating mechanism at the spring connecting portion between the leaf spring and the coil spring. Since the leaf spring and the coil spring can cooperate with each other in the driving direction of the drive unit, and the twisting force of the coil spring does not act in the rotation direction of the leaf spring, the leaf spring is not stressed. It is possible to extend the life of the Stirling refrigerator without concentrating it, so that the life of the Stirling refrigerator can be extended. Moreover, since a practical structure in which a leaf spring and a coil spring are used in combination is realized, it is necessary not only to secure the spring constant, but also it is advantageous in terms of assemblability and cost.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a Stirling refrigerator 40 adopting a drive spring connecting structure according to an embodiment of the present invention.
Will be described with reference to FIG. However, the same parts as those in FIG. 2 are designated by the same reference numerals, and the detailed description thereof will be omitted. Figure 1
2 is a cross-sectional view of the Stirling refrigerator 40 similar to FIG. 2, and in the Stirling refrigerator 40, the portion of the drive spring connecting structure 42 of the gas compressor 41 is the Stirling refrigerator 1 (FIG. 2). Is different.

That is, in the drive spring portion connecting structure 42,
Spring connecting portion 4 for connecting the leaf spring 17 and the coil spring 19
The drive spring portion 45 is configured by providing the bearing 44 on the shaft 3.

Although any bearing can be adopted as the bearing 44, the movement in the driving direction between the leaf spring 17 and the coil spring 19 can be integrated, and the surface perpendicular to the driving direction can be used. Inside, these are movable independently of each other, and for example, this is a thrust bearing having a rotating structure.

The bearing 44 is arranged between the first spring seat 21 and the pressing plate 46, and the connecting bolt 2
The bearing 44 and the pressing plate 46 are fixed to the first spring seat 21 by 3. The cylinder head 1
The diametral clearance between 4 and the holding plate 46 is
This is set to 10 μm to 60 μm, and the airtightness is maintained by utilizing the clearance sealing action.

In the gas compressor 41 or the drive spring portion connecting structure 42 having such a structure, the leaf spring 17 and the coil spring 19 can act each other's elastic force in the drive axis direction of the cylinder 8, and the respective spring constants are combined. It is possible to secure the driving force by the necessary spring constant. Further, in the spring connecting portion 43, since the bearing 44 is provided between the leaf spring 17 and the coil spring 19, the twisting force of the coil spring 19 does not act on the leaf spring 17, so that the spring connecting portion 43.
Concentration of stress on the leaf spring 17 at is minimized.

Therefore, from the coil spring 19 to the leaf spring 1
It is possible to cut off the acting force on 7 to reduce the maximum concentrated stress applied to the leaf spring 17 and extend the life of the leaf spring 17. Thus, the life of the Stirling refrigerator 40 itself can be extended.

[0033]

As described above, according to the present invention, since the bearing is provided at the spring connecting portion between the leaf spring and the coil spring,
The independence of the leaf spring and the coil spring in the rotation direction is ensured, and it is possible to use the leaf spring and the coil spring together.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a Stirling refrigerator 40 that employs a drive spring part connection structure 42 according to an embodiment of the present invention.

FIG. 2 is a sectional view of a Stirling refrigerator 1 proposed by the present applicant.

[Explanation of symbols]

1 Stirling Refrigerator (Fig. 2) 2 Gas Compressor 3 Cold Head 4 Compressor Case 5 Intermediate Header 6 Piston 7 Yoke 8 Cylinder 9 Drive Spring Part 10 Annular Permanent Magnet 11 Electromagnetic Coil 12 Support Part 13 Gas Channel 14 Cylinder Head 15 Sealing member 16 Compression expansion chamber 17 Leaf spring 17A of drive spring portion 9 Winding slit leaf spring (leaf spring) 17B Lead wire connection leaf spring (leaf spring) 18 Spring connecting portion 19 of drive spring portion 9 Drive spring portion 9 Coil spring 20 mounting bolt 21 first spring sheet 22 second spring sheet 23 connecting bolt 24 fixing bolt 25 conical cover member 26 lead wire connecting leaf spring 17B lead connecting piece 27 lead wire 28 drive unit (piston 6, cylinder) 8, drive spring portion 9, permanent magnet 10, electromagnetic coil 11) 29 gas supply pipe 30 31 Cold storage material 32 Displacer (piston) 33 Spring material 40 Stirling refrigerator (FIG. 1) 41 Gas compressor 42 Drive spring part connection structure in the refrigerator (embodiment, FIG. 1) 43 Spring connection part 44 Bearing (rotation) (Thrust bearing having structure) 45 Drive spring portion 46 Holding plate

Continued front page    (72) Inventor Yuichiro Suzuki             2-1-1 Yatocho, Nishi-Tokyo, Tokyo             Inside the Tanashi Works of Tomo Heavy Industries

Claims (3)

[Claims] 1. A refrigerator having a drive spring portion composed of a leaf spring and a coil spring, wherein the elastic force of the drive spring portion compresses and expands a refrigerant to generate freezing. A drive spring part connection structure in a refrigerator, comprising: a yoke fixing an outer peripheral part; and a spring connecting part provided on an inner peripheral part of the plate spring and connecting the plate spring and the coil spring to each other. A drive spring part connection structure in a refrigerator, characterized in that a bearing is provided between the leaf spring and the coil spring in the connection part. 2. The bearing can integrate movements of the leaf spring and the coil spring in a driving direction, and can move them independently of each other in a plane perpendicular to the driving direction. The drive spring part connection structure in the refrigerator according to claim 1, wherein 3. The drive spring part connection structure for a refrigerator according to claim 1, wherein the bearing is a thrust bearing having a rotating structure.