JP3858193B2 - Manufacturing method of leaf spring in refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a manufacturing method of the leaf spring in the refrigerator, to a manufacturing method of the leaf spring in particular Stirling refrigerator other refrigerator for generating refrigeration comprising a gas compressor.
[0002]
[Prior art]
Stirling refrigerators and other refrigerators that produce refrigeration by compressing and expanding a refrigerant gas such as helium gas by the interaction of the cylinder and piston, and using a leaf spring as a drive unit for driving the cylinder and piston is there. For example, there is JP-A-5-215423.
An outline will be given based on FIG.
FIG. 4 is a cross-sectional view of a Stirling refrigerator 1 proposed by the present applicant. The Stirling refrigerator 1 includes a gas compressor 2 and a cold head 3.
[0003]
The gas compressor 2 is for generating a refrigeration in the cold head 3 by compressing and supplying refrigerant to the cold head 3 and absorbing and expanding it. The compressor case 4, the intermediate head 5, and the intermediate head 5 A pair of left and right pistons 6, a pair of left and right yokes 7, a pair of left and right cylinders 8 attached to each yoke 7, two pairs of left and right circular leaf springs 9, and a pair of left and right circles An annular permanent magnet 10 and a pair of left and right annular electromagnetic coils 11 are provided.
[0004]
The compressor case 4 accommodates the intermediate head 5, the piston 6, the yoke 7, the cylinder 8, the leaf spring 9, the permanent magnet 10 and the electromagnetic coil 11 symmetrically in the axial direction of the piston 6.
[0005]
The intermediate head 5 appears in a cross shape in FIG. 4, has a support portion 12 in the vertical and vertical directions, and forms a pair of left and right pistons 6 in a substantially central lateral direction. A gas flow path 13 of a refrigerant such as helium gas is formed at the center of the 12.
[0006]
The piston 6 faces a pair of left and right cylinder heads 14 and is provided with a seal member 15 on the outer peripheral surface thereof. A compression / expansion chamber 16 is provided between the cylinder 8 and the cylinder head 14 integrally attached to the cylinder 8. Form. The compression / expansion chamber 16 communicates with the gas flow path 13. The cylinder 8 can move integrally with the electromagnetic coil 11.
[0007]
The yoke 7 is a member made of, for example, iron for forming a magnetic path, and has an outer peripheral portion of the leaf spring 9 and a permanent magnet 10 attached thereto.
[0008]
The cylinder 8 has a piston 6 inserted therein so as to be relatively movable in the axial direction, and the cylinder 8 can reciprocate in the axial direction with respect to the fixed piston 6.
In addition, as a drive type of the gas compressor 2, there are a piston drive type that moves the piston 6 and a cylinder drive type that moves the cylinder 8, but the illustrated example is a cylinder drive type.
[0009]
The leaf spring 9 is made of a metal material having conductivity and elasticity, and its outer peripheral portion is attached to the yoke 7 by the mounting bolt 17 and its inner peripheral portion is attached to the cylinder head 14 by the mounting bolt 17. The compressor case 4 has a plurality of outer winding slit leaf springs 9A and an inner lead wire connecting leaf spring 9B.
[0010]
FIG. 5 is a plan view of the wound slit leaf spring 9A, and FIG. 6 is a plan view and a side view of the lead wire connecting leaf spring 9B.
As shown in FIG. 5, the winding slit leaf spring 9A includes an outer peripheral side mounting hole 18, an inner peripheral side mounting hole 19, a plurality of curved slits 20 from the outer peripheral side toward the central direction, a central hole 21, Is formed.
As shown in FIG. 6, the lead wire connecting leaf spring 9B includes an outer peripheral side mounting hole 18, an inner peripheral side mounting hole 19, a center hole 21, a terminal side hole 22, and a lead wire connecting piece 23 (bending piece). , Lip).
The cylinder 8 and the electromagnetic coil 11 can be reciprocated in the axial direction by the elastic force of the winding slit leaf spring 9A and the lead wire connecting leaf spring 9B, particularly the winding slit leaf spring 9A in which a plurality of curved slits 20 are formed. I support it.
[0011]
The permanent magnet 10 and the electromagnetic coil 11 constitute a linear motor, and are arranged so as to face each other. A lead wire 24 soldered to the lead wire connecting piece 23 of the lead wire connecting leaf spring 9B is provided. Thus, an alternating current having a predetermined frequency can be supplied to the electromagnetic coil 11.
Together with the permanent magnet 10 and the electromagnetic coil 11, the leaf spring 9, the piston 6 and the cylinder 8 constitute a drive unit 25 to generate relative movement of the piston 6 and the cylinder 8.
That is, by passing an alternating current of a predetermined frequency through the electromagnetic coil 11 and by the elastic repulsive force of the leaf spring 9, the permanent magnet 10 and the electromagnetic coil 11 are driven relatively in the axial direction to thereby move the piston 6 and the cylinder 8. Relative motion is generated, the pressure of the refrigerant in the compression / expansion chamber 16 is raised and lowered, and a change in pressure of the refrigerant is supplied from the gas flow path 13 to the cold head 3 side through the gas supply pipe 26 at a predetermined timing. 3. Refrigeration is generated.
[0012]
That is, the cold head 3 includes a cylinder 27, a displacer 29 (piston) containing the regenerator material 28, and a spring material 30, and supplies (compressing and expanding) the refrigerant and the displacer that are out of phase with each other. A reverse Stirling cycle is executed in accordance with the reciprocating motion 29 to generate refrigeration.
As this spring material 30, not only a coil spring but also a plate spring 9 similar to the above can be adopted.
Further, the cold head 3 may have a linear motor similar to that provided in the gas compressor 2.
[0013]
FIG. 7 is a plan view showing another type of leaf spring 31 for lead wire connection (leaf spring 9B for lead wire connection). The side attachment hole 18 and the center hole 32 are formed, and a lead wire connecting piece 33 (bending piece, lip) is formed outside the circumference.
[0014]
In manufacturing the plate spring 9 (winding slit plate spring 9A, lead wire connecting plate spring 9B) or the lead wire connecting plate spring 31 as described above, a flat plate as a material manufactured by rolling or the like is slit by etching. A method of cutting and forming the curved slit 20 or the like has been conventionally performed (see, for example, Japanese Patent No. 119497).
[0015]
By the way, when the leaf spring 9 that supports the movable part (piston 6 or cylinder 8) in the gas compressor 2 of the Stirling refrigerator 1 is manufactured, not only the support function but also the spring constant for obtaining the driving force is increased. And it is necessary to make it so that it can be obtained accurately.
[0016]
FIG. 8 is a cross-sectional view of the main part in the plate thickness direction in the etching process when manufacturing such a plate spring 9 (winding slit plate spring 9A, lead wire connecting plate spring 9B) (or lead wire connecting plate spring 31). Then, for example, the curved slit 20 is formed by applying an etching mask 34 to one surface of the flat plate of the material, spraying an etching solution 35, and performing etching.
However, when it is desired to increase the spring constant, it is common to increase the thickness of the flat plate. However, if the plate thickness is increased, the etching process takes time, so the surface near the etching mask 34 is unnecessary. There is a problem that the inner part is not fully melted toward the opposite surface.
[0017]
Therefore, the portion on the side where the etching mask 34 is applied is greatly removed, and the sectional shape of the curved slit 20 of the leaf spring 9 (winding slit leaf spring 9A) formed from this flat plate is as shown in FIG. There is a problem that the curved spring 20A having a distorted cross-sectional shape having a non-uniform width in the thickness direction becomes a flat spring 9 as designed.
In particular, the side end portions of the curved slit 20 (20A), that is, the mask side end portion 20B and the opposite end portion 20C are sharpened, and stress concentration is likely to occur there. Therefore, there is a problem that the leaf spring 9 that performs repetitive vibration motion is likely to be damaged.
These various problems also occur when the lead wire connecting leaf spring 9B (FIG. 6) or the lead wire connecting leaf spring 31 (FIG. 7) is manufactured. This is a problem in designing the spring constant when the curved slit 20 is manufactured in the winding slit leaf spring 9A for obtaining the above.
[0018]
Furthermore, after the etching process, components (such as the lead wire connecting leaf spring 9B and the lead) that require bending such as the lead wire connecting piece 23 (FIG. 6) and the lead wire connecting piece 33 (FIG. 7). In the line connecting leaf spring 31), there is a problem that the bent portion 23A and the bent portion 33A are cracked and cannot be used.
As a result of examining such a cracking problem, the rolling direction of the flat plate, which is the material of the leaf spring 9 (lead wire connecting leaf spring 9B, lead wire connecting leaf spring 31), and the lead wire connecting piece 23 (bending portion) 23A) and the formation direction of the lead wire connecting piece 33 (bending portion 33A).
[0019]
[Problems to be solved by the invention]
The present invention has been considered that bite the problems as described above, that in particular the durability and mechanical strength of the leaf spring and as designed, to provide a manufacturing method of a leaf spring in the refrigerator reliable long life Is an issue.
[0020]
The present invention aims to provide a manufacturing method of a leaf spring in the refrigerator with an improved fabrication technique of the leaf spring is an important component to the refrigerator and long life.
[0021]
Another object of the present invention is to provide a method of manufacturing a leaf spring in a refrigerator that can maintain the mechanical strength at a predetermined level when the leaf spring is manufactured.
[0022]
The present invention aims to provide a manufacturing method of a leaf spring in the refrigerator so that no mechanical strength even if bent portion such as a lead wire connecting pieces is reduced.
[0023]
[Means for Solving the Problems]
In relation to the method for producing a leaf spring in the refrigerator according to the present invention, in order to form a curved slit or the like of the leaf spring so as to have a uniform width particularly in the thickness direction, the curved slit formed in the leaf spring. that the slit width or thickness plate, and focused from both sides of the flat plate of the material to be etched, in the refrigerator for generating refrigeration by performing compression and expansion of the refrigerant, penetrating in its thickness direction a plate spring which is formed a plurality of curved slits in the central direction from an outer peripheral side Te, the width of the curved slits, be a leaf spring in the refrigerator, characterized in that as its thickness or Desirable .
[0024]
Similarly, in order to form a curved slit or the like of a leaf spring so as to have a uniform width particularly in the thickness direction, in a refrigerator that generates refrigeration by compressing and expanding the refrigerant, Is a manufacturing method of a leaf spring that forms a plurality of curved slits from the outer peripheral side to the center direction by etching through an etching mask, and an etching mask is disposed on each side of the leaf spring in the plate thickness direction, It is desirable to provide a method for manufacturing a leaf spring in a refrigerator, wherein etching is performed from both sides, and the width of the curved slit is equal to or greater than the plate thickness.
[0025]
In order to prevent the mechanical strength from being lowered even if the leaf spring has a bent portion such as a lead wire connecting piece, the rolling direction of the flat plate, which is the material of the leaf spring, and the bent portion In a refrigerator that generates refrigeration by compressing and expanding refrigerant, the leaf spring is a manufacturing method of a leaf spring that forms a bent piece by bending from the plane in a bent portion. And it is a manufacturing method of the leaf | plate spring in the refrigerator characterized by arrange | positioning the said bending part of the said bending piece in the direction which is not parallel with the rolling direction of the flat plate which is the material of the said leaf | plate spring.
[0026]
The refrigerator includes a gas compressor. The gas compressor includes a cylinder and a piston inserted into the cylinder, and the leaf spring includes one of the piston and the cylinder. It can be driven in the axial direction.
[0027]
The refrigerator has a cold head, the cold head has a cylinder and a displacer inserted into the cylinder, and the leaf spring enables the displacer to be driven in the axial direction. be able to.
[0028]
In connection with the fabrication method of the leaf spring in the refrigerator according to the present invention, as well as the slit width of the curved slits than the thickness of the leaf spring, if it is etched from both sides of the flat plate, the time to the etching process Even if it is applied, the etching solution acts more in the thickness direction of the leaf spring, and acts almost uniformly in the width direction of the curved slit. A curved slit can be formed.
Therefore, in a gas compressor such as a Stirling refrigerator, the durability and mechanical strength of the leaf spring, which is particularly used in large numbers, can be manufactured as designed to achieve a long life.
[0029]
Oite The manufacturing method of the leaf spring in the refrigerator according to the present invention, since the direction of the bent portion of the lead wire connecting pieces to avoid the parallel to the rolling direction of the plate, the durability and mechanical strength Even if it is used for a gas compressor or a cold head of a refrigerator, the damage can be avoided and the reliability can be improved.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Next, a manufacturing method of the leaf spring in the refrigerator according to the embodiment of the present invention will be described with reference to FIG. 2 , and a related leaf spring and a manufacturing method thereof will be described with reference to FIGS. 1 and 3 . However, the same parts as those in FIGS. 4 to 8 are denoted by the same reference numerals, and detailed description thereof will be omitted.
FIG. 1 is a cross-sectional view of the etching process when the curved slit 20 is formed in the leaf spring 9 (winding slit leaf spring 9A), and patterns having the same shape are formed on both sides of the flat plate which is the material of the leaf spring 9. Etching is performed so that the etched masks 34 are respectively arranged and sprayed with the etching solution 35 from both sides to simultaneously form the same pattern from both sides.
Further, T ≦ D, where T is the thickness of the leaf spring 9 and D is the width of the curved slit 20. That is, the slit width T is set to be equal to or greater than the plate thickness D, and preferably D / T = about 1.0 to 1.5.
[0031]
By such an etching process, the leaf spring 9 having the designed characteristics can be manufactured.
That is, since the slit width T is set to be equal to or greater than the plate thickness D and the etching process is performed from both sides of the plate spring 9, the curved slit 20 is formed with respect to the thickness center line of the plate spring 9. At the same time, a relatively uniform etching action can be performed in the width direction of the curved slit 20, and the curved slit 20A having a distorted cross-section shape, as shown in FIG. Absent.
[0032]
FIG. 2 illustrates a method for producing a leaf spring in a refrigerator according to the present invention . Lead wire connecting leaf spring 9B (FIG. 6) or lead wire connecting leaf spring 31 (FIG. 7) that needs to be bent. The lead wire connecting piece 23 or the lead wire connecting piece 33 protrudes along the rolling direction of the flat plate 36 of material.
That is, the bent portion 23A of the lead wire connecting piece 23 and the bent portion 33A of the lead wire connecting piece 33 are not parallel to the rolling direction, and are preferably in the vertical direction.
[0033]
By such bending, the lead wire connecting leaf spring 9B and the lead wire connecting leaf spring 31 in which the mechanical strength of the lead wire connecting piece 23 and the lead wire connecting piece 33 is maintained at a predetermined level can be manufactured.
That is, the mechanical strength is set to a predetermined level by bending the lead wire connecting piece 23 and the lead wire connecting piece 33 while noting that the mechanical strength differs between the rolling direction and the direction perpendicular to the rolling direction. Can be maintained.
[0034]
FIG. 3 is a graph showing the relationship between the load and the amount of displacement when the leaf spring 9 is formed with a thickness T = 0.7 mm and a width D = 1.2 mm. It can be seen that the measured average value of the work draws almost the same curve, and the leaf spring 9 as designed can be produced.
[0035]
【The invention's effect】
As described above, according to the present invention, the mechanical strength is maintained at a predetermined level by preventing the lead wire connecting piece from being bent at the bent portion parallel to the rolling direction of the flat plate that is the material of the leaf spring. can do.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an etching process when a curved slit 20 is formed in a leaf spring 9 (winding slit leaf spring 9A) related to a production method of a leaf spring in a refrigerator according to the present invention.
FIG. 2 explains a method for manufacturing a leaf spring in a refrigerator according to an embodiment of the present invention, and a lead wire connecting leaf spring 9B (FIG. 6) or a lead wire connecting leaf spring that needs to be bent; It is a top view for manufacturing 31 (FIG. 7) etc. FIG.
FIG. 3 is a graph showing a relationship between a load and a displacement when a leaf spring 9 is formed with a thickness T = 0.7 mm and a width D = 1.2 mm in relation to the present invention .
FIG. 4 is a cross-sectional view of a Stirling refrigerator 1 proposed by the present applicant.
FIG. 5 is a plan view of the wound slit leaf spring 9A.
6 is a plan view and a side view of the lead wire connecting leaf spring 9B. FIG.
7 is a plan view showing another type of leaf spring 31 for lead wire connection (plate spring 9B for lead wire connection). FIG.
FIG. 8 is a cross-sectional view of an essential part in the plate thickness direction in an etching process when manufacturing the leaf spring 9 (winding slit leaf spring 9A, lead wire connecting leaf spring 9B) (or lead wire connecting leaf spring 31). It is.

Claims (3)

In a refrigerator that generates refrigeration by compressing and expanding refrigerant,
A method for producing a leaf spring that forms a bent piece by bending from the plane in a bent portion,
A method for producing a leaf spring in a refrigerator, wherein the bent portion of the bent piece is arranged in a direction that is not parallel to a rolling direction of a flat plate that is a material of the leaf spring. The refrigerator has a gas compressor,
This gas compressor
A cylinder,
Having a piston to be inserted into the cylinder,
It said plate spring, a manufacturing method of the leaf spring in claim 1, wherein the refrigerator, characterized in that the drivable one of the piston and the cylinder in the axial direction. The refrigerator has a cold head,
This cold head
A cylinder,
And having a displacer inserted into the cylinder,
It said plate spring, a manufacturing method of the leaf spring in claim 1, wherein the refrigerator, characterized in that to enable driving the displacer in the axial direction.

Images