JPH05272825A - Method of manufacturing regenerator - Google Patents

Abstract

PURPOSE:To obtain a mesh having a fine wire diameter and rough mesh opening easily and to improve performance of a regenerator by a method wherein rigidity of the mesh when the mesh is punched with a die is assured and there is provided means for thinning the wire diameter of the mash. CONSTITUTION:Strands 3 are made of stainless steel of phosphorous copper or the like and a screen mesh member is constructed of the strands 3. In this case, as the strands 3, wires having wire diameter larger than a target diameter under a state where they are used as the mesh 2. Then, several circular meshes 2 having profile watch with that of the casing 1 are punched from a mesh member 4. Then, a required number of meshes 2 punched are fitted to the casing 1 nd stacked while being pressurized. Then, the casing 1 is immersed in a corrosive solution within a tank 5. After this operation, as the wire diameter of the mesh strand is thinned down to the target wire diameter, the casing 1 is removed out of the solution and then the corrosive solution is removed through washing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a mesh type regenerator (regenerative heat exchanger) used in, for example, a cryogenic refrigerator.

[0002]

2. Description of the Related Art Hitherto, as a cryogenic refrigerator for generating a cryogenic level of refrigeration by expanding a high-pressure refrigerant gas such as helium gas in a cylinder of an expander, for example, Japanese Patent Laid-Open Publication No. 5 (1999) -58242.
As disclosed in JP-A-8-214758, a compressor that compresses helium gas as a refrigerant gas and an expander that expands the compressed gas are connected to a closed circuit by high-pressure piping and low-pressure piping. The high-pressure and low-pressure pipes are alternately switched to communicate with each other in the expander cylinder, and the slack piston is reciprocated in the cylinder according to this switching operation, and the displacer is reciprocally driven by this piston to move the helium gas. It is known that cold is generated by expanding the.

In addition, as a displacer reciprocating type cryogenic refrigerator, a compressor that pressurizes a refrigerant gas in a predetermined cycle and an expander that expands the refrigerant gas pressurized by the compressor are combined. , A Stirling configured to reciprocate a piston in the cylinder of the compressor to generate a gas pressure of a predetermined cycle to reciprocate a displacer in the cylinder of the expander to generate cold by expansion of the refrigerant gas. Refrigerators are also well known (eg "Refrig
erator for Cryogenic Sensors ”, NASA Conference Pu
blication 2287 etc.).

The expander of these cryogenic refrigerators has a built-in regenerative heat exchanger called a regenerator. One type of this regenerator is a casing as a displacer through which gas can flow. There is a mesh type which is composed of a large number of meshes (called a regenerator matrix) filled in a laminated state, and stores heat and heats the gas by exchanging heat with the gas passing through the mesh. When manufacturing a regenerator of this type, conventionally, a mesh is punched out from a screen-shaped mesh body in which strands are knitted in accordance with a casing, and then a large number of meshes are required one by one (for example, 1,000 or more). In general, a method of stacking and filling the casing while pressing and inserting the casing into the casing is performed.

[0005]

By the way, in this mesh type regenerator, the material of the mesh, the wire diameter, the opening (mesh number), the number of fillings, etc. are important factors affecting the performance. For example, in a Stirling refrigerator, the porosity of the regenerator determined by the mesh opening is
It is believed that the larger the currently manufactured range, the more optimally the behavior of the displacer with the built-in regenerator can be set to improve the performance of the refrigerator.

However, even if the wire diameter and mesh size of the mesh are optimally selected, there is a problem that a regenerator having the required performance cannot be obtained due to the manufacturing reason. That is,
The mesh knitted from the strands becomes less rigid as the wire diameter is smaller and the mesh size is larger (for example, 130 to 100 mesh or less). Therefore, if these requirements are met, the shape is likely to be distorted when punching with a die. , Difficult to manufacture well.

The present invention has been made in view of the above points, and an object thereof is to secure rigidity at the time of punching a mesh by a die, and thereafter to take measures to reduce the wire diameter of the mesh. In order to improve the performance, it is possible to easily obtain a mesh having a small wire diameter and a large opening.

[0008]

In order to achieve the above object, according to the present invention, punching with a die is performed in a highly rigid state to prevent the mesh shape from being crushed, and after the punching step, the wire of the mesh element wire is cut. The diameter will be scaled down.

Concretely, in the invention of claim 1, as shown in FIG. 1, the mesh (2) is made up of a large number of meshes (2), (2), ... ), (2), ... As a method of manufacturing a mesh type regenerator for exchanging heat with a gas passing therethrough to store heat and to heat the gas, first, a wire-shaped (3), (3) ,. A mesh body (4) is knitted, and meshes (2), (2), from this mesh body (4) to the casing (1).
Punch out ... Then, this mesh (2), (2),
After laminating and filling the casing (1) with ..., the wire (3) of the mesh (2) is corroded with the corrosive solution by immersion in a corrosive solution or the like, and the diameter of the wire (3) is set to a predetermined value. Scale down to the value.

According to the invention of claim 2, as shown in FIG.
The wire (3) which becomes the mesh (2) is coated with a metal (6) having a greater ionization tendency than the wire (3),
A mesh body (4) is knitted by the coated strands (3), (3), .... From this mesh body (4) to the casing (1), meshes (2), (2),
.. are punched out, and the meshes (2), (2), .. are stacked and filled in the casing (1), and then the metal wire (3) of the mesh (2) is coated with a metal ( 6) Corrosion and removal.

According to the invention of claim 3, in the invention of claim 2, the mesh body itself is coated with a metal.
That is, in the present invention, as shown in FIG. 3, a mesh body (4) in which the strands (3), (3), ... Are knitted is coated with a metal (6) having a greater ionization tendency than the strands (3). Then, the meshes (2), (2), ... Are punched out from the mesh body (4) according to the casing (1), and then the meshes (2), (2) ,. The coated metal (6) is corroded and removed from the wire (3) of the mesh (2) by a corrosive solution.

In the invention of claim 4, the coating metal in the invention of claim 2 is replaced with resin. That is,
In the present invention, as shown in FIG. 2, a resin coating (6 ') is coated on a wire (3) to be the mesh (2), and the coated wire (3), (3), ... After knitting the body (4) and punching out the meshes (2), (2), ... From the mesh body (4) according to the casing (1), the meshes (2), (2) ,. The coated resin film (6 ') is dissolved and removed from the wire (3) of the mesh (2) by being laminated and filled in (1) and immersed in a solvent.

In the invention of claim 5, the coating metal in the invention of claim 3 is replaced with a resin. That is,
In this invention, as shown in FIG. 3, the wires (3),
After coating the resin body (6 ') on the mesh body (4) in which (3), ... Is knitted, meshes (2), (2), from the mesh body (4) to the casing (1),
.. are punched out, then the meshes (2), (2), ... Are laminated and filled in the casing (1), and the resin film (6 ') coated with the solvent from the wire (3) of the mesh (2). ) Is dissolved and removed.

[0014]

With the above structure, in the invention of claim 1, when the mesh body (4) is knitted, the strands (3), which are thicker than the intended wire diameter required as the mesh (2) of the regenerator, By knitting the mesh body (4) with (3), ..., its rigidity is increased, and when the mesh (2), (2), ... Is punched out from this mesh body (4) in accordance with the casing (1). Therefore, it is possible to effectively prevent distortion and crushing of the shape of the mesh (2). Then, when the mesh (2), (2), ... Is laminated and filled in the casing (1) and then immersed in a corrosive solution, the wire (3) of the mesh (2) is corroded by the corrosive solution. Then, the diameter of the strand (3) is scaled down to the target diameter. Therefore, the mesh (2) having a small wire diameter and a large opening can be easily obtained without causing shape distortion, and the performance can be improved.

In the second or fourth aspect of the invention, the wire (3) forming the mesh (2) is coated with a metal (6) or a resin coating (6 ') having a greater ionization tendency than the wire (3). Therefore, the mesh body (4) knitted by the coated strands (3), (3), ...
Of the mesh body (4) has a high rigidity, and the shape distortion can be prevented even if the mesh bodies (2), (2), ... Are punched out from the mesh body (4) in accordance with the casing (1). Thereafter, the coated metal (6) or resin coating (6 ') is removed by corrosion or dissolution from the wire (3) of the mesh (2) by a corrosive solution or a solvent, and the mesh wire (3) The target wire diameter is scaled down. Also in this invention, the mesh (2) having a small wire diameter and a large opening can be easily obtained without causing a shape distortion.

In the third or fifth aspect of the invention, the mesh body (4) is coated with the metal (6) or the resin coating (6 ') having a greater ionization tendency than that of the wire (3). The coated wire (3),
The rigidity of the mesh body (4) knitted by (3), ... Is increased, and from this mesh body (4) to the casing (1).
Even if the mesh (2) is punched out in accordance with, it is possible to prevent shape distortion. When the mesh (2), (2), ... Are laminated and filled in the casing (1) and then immersed in a corrosive solution or a solvent, the strands (3) of the mesh (2) become corrosive solution or solvent. Is corroded or melted, and the diameter of the strand (3) is scaled down to the target diameter. Therefore, the above-mentioned claim 2
Alternatively, the same effects as the invention of 4 are obtained. Further, the knitted mesh body (4) has a metal (6) or resin coating (6 ').
Since the coating is performed, it is only necessary to add a step of coating the mesh body (4) with the metal (6) or the resin coating (6 ′) and a step of removing the metal body (4) from the conventional manufacturing method, and a large process change is required. It can be manufactured without requiring.

[0017]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows steps of a method for manufacturing a regenerator according to Embodiment 1 of the present invention. This embodiment is applied to the case of manufacturing a regenerator (R) in an expander of a Stirling refrigerator, and constitutes a displacer (replacer) having a gas passage hole (not shown) at the bottom. Helium that passes through the meshes (2), (2), ..., and is composed of a large number of metal meshes (2), (2), ... It exchanges heat with a refrigerant gas such as to store heat and heat the gas.

In this embodiment, first, as shown in FIG. 1 (a), the wire (3) is made of a material such as stainless steel or phosphor bronze, and the wire (3) forms a screen-shaped mesh body ( 4) Knit. This mesh body (4) is shown in FIG.
The structure is similar to the conventional one as shown in an enlarged view in (b), and the strands (3), (3), ... Are knitted in the vertical and horizontal directions. At this time, the wire (3) used has a wire diameter larger than the intended wire diameter in the state of being used as the mesh (2).

Then, as shown in FIG. 1 (c), using a punching die (not shown) consisting of upper and lower dies, a mesh body (the mesh body knitted with the strands (3), (3), ... From 4), a large number of circular meshes (2) that match the cross-sectional shape of the casing (1) are punched out. At that time, the mesh body (4) is thicker than the intended wire diameter originally required as the mesh (2) of the regenerator (R).
Since it is knitted with, its rigidity is high, and when punching the mesh (2), (2), ... From this mesh body (4), distortion and crushing of the shape of the mesh (2) are effectively prevented. , A mesh (2) whose shape exactly matches the cross section inside the casing (1) is obtained.

Thereafter, as shown in FIG. 1 (d), a required number of the meshes (2) obtained by the punching are fitted into the casing (1) and filled in a laminated state while applying pressure.

Next, as shown in FIG. 1 (e), a casing (1) filled with the meshes (2), (2), ...
Is immersed in a corrosive solution (aqua regia if the wire (3) is stainless steel) in the tank (5). Thereby, by corroding the wires (3), (3), ... Of the meshes (2), (2), ... With a corrosive solution, for example, by controlling the immersion time and temperature in the solution, The diameter of the strand (3) is scaled down to the target diameter. At this time,
If the casing (1) is made of metal, it may be corroded at the same time. Therefore, it is preferable that the casing (1) is made of resin or the like. Further, as the diameter of the wire (3) is scaled down, the packing density of the meshes (2), (2), ...

After that, when the wire diameter of the mesh wire (3) is reduced to a target wire diameter, the casing (1) may be taken out of the solution and washed to remove the corrosive solution. ) Is obtained.

Therefore, in the regenerator (R) thus obtained, the wires (3) in the meshes (2), (2), ... Is large and there is no shape distortion. Therefore, a high-performance regenerator (R) can be easily obtained.

(Embodiment 2) FIG. 2 shows Embodiment 2, which facilitates corrosion control in the scale-down process of the mesh wire (3). In this embodiment,
Unlike the above, as the strand (3), the one having the target wire diameter as it is in the state of being used as the mesh (2) is used. First, as shown in FIG. 2 (a), the wire (3) forming the mesh (2) has a greater ionization tendency than the wire (3), in other words, a metal (6) (wire ( When 3) is stainless steel, it is coated with magnesium, iron, tin, etc.). This coating metal (6)
The higher the hardness, the greater the effect of increasing the rigidity in the subsequent punching process.

Then, as shown in FIG. 2 (b), a screen-shaped mesh body (4) is knitted with the wire (3) coated with the metal (6). This mesh body (4)
As shown in the enlarged view of FIG. 2C, the wires (3), (3), etc., which are coated with a metal (6) and have a large diameter, are knitted in the vertical and horizontal directions. The rigidity is increasing.

Next, as shown in FIG. 2 (d), using a punching die, a large number of circular meshes (2) matching the cross-sectional shape of the casing (1) from the mesh body (4) are prepared. Punch a sheet. At this time, the rigidity of the mesh body (4) knitted with the thick strands (3), (3), ... Due to the coating of the metal (6) is high, so that the mesh bodies (4) to (2), ( When punching out 2), ..., it is possible to prevent distortion and crushing of the shape of the mesh (2), and the shape of the mesh (2) accurately matches the cross section of the casing (1).
Is obtained.

Thereafter, as shown in FIG. 2 (e), the required number of meshes (2) obtained by the punching are fitted into the casing (1) and filled in a laminated state.

Next, as shown in FIG. 2 (f), the casing (1) filled with the meshes (2), (2), ...
The corrosive solution (eg sulfuric acid, hydrochloric acid, etc.) in the tank (5)
Dip into. This allows the mesh (2),
The diameter of the strands (3) is scaled by corroding and removing only the metal (6) coated on the strands (3), (3), ... of (2) ,. Bring it down. At that time, since the metal (6) coated on the strand (3) has a greater ionization tendency than the strand (3) and is more likely to be corroded, the coating metal is immersed in the corrosive solution. Only (6) is preferentially corroded and removed, and the corrosion control becomes easier than in the first embodiment.

Then, when the wire diameter of the mesh element wire (3) reaches the target wire diameter, the casing (1) may be taken out from the solution and the corrosive solution may be removed by washing. Is obtained. Therefore, also in this embodiment,
A regenerator (R) similar to that of the above-mentioned Embodiment 1 can be obtained.

In this embodiment, the mesh (2)
Instead of coating the wire (3) with the metal (6), a resin coating (6 ') may be applied to the surface of the wire (3). In that case, in the step shown in FIG. 2 (f) performed after filling the casing (1) with the meshes (2), (2), ..., Instead of the corrosive solution, the resin coating on the surface of the wire (3) It suffices to use a solvent that dissolves and removes (6 ′), and it is possible to achieve the same effect as the above.

(Third Embodiment) FIG. 3 shows a third embodiment of the present invention. In this embodiment, the step of coating the strand (3) with a metal (6) having a greater ionization tendency than that is performed after the mesh body (4) is knitted. That is,
In this embodiment, first, as shown in FIG. 3A, the strands (3), (3), ... Which become the mesh (2) are knitted to form a mesh body (4).

Next, as shown in FIG. 3 (b), the mesh body (4) is coated with a metal (6) having a greater ionization tendency (prone to corrosion) than the wire (3).
(7) is a nozzle for coating the mesh body (4) with the metal (6) from above and below. By this processing, as shown in an enlarged view in FIG.
Since the metal (6) is coated around (3), ..., The rigidity of the mesh body (4) is increased overall.

Next, as shown in FIG. 3 (d), using a punching die, a large number of circular meshes (2) matching the cross-sectional shape of the casing (1) from the mesh body (4) are prepared. Punch a sheet. At that time, since the mesh body (4) has a high rigidity as a whole due to the coating of the metal (6),
From this mesh body (4) to meshes (2), (2), ...
It is possible to prevent distortion and crushing of the shape of the mesh (2) when punching.

After that, as shown in FIG. 3 (e), the required number of meshes (2) obtained by the punching are fitted into the casing (1) and filled in a laminated state.

Next, as shown in FIG. 3 (f), a casing (1) filled with the meshes (2), (2), ...
Is immersed in the corrosive solution in the tank (5). As a result, only the metal (6) coated on the wires (3) of the meshes (2), (2), ... Is corroded and removed by a corrosive solution to remove the wires (3). Scale down the diameter. At that time, since the metal (6) coated on the wire (3) has a larger ionization tendency than the wire (3), only the coating metal (6) is preferentially subjected to the immersion in the corrosive solution. It is easily corroded and removed, making it easier to control corrosion.

Thereafter, when the wire diameter of the mesh element wire (3) reaches a target wire diameter, the casing (1) is taken out of the solution and washed to remove the corrosive solution. The regenerator (R) is obtained as described above.

Therefore, also in this embodiment, a regenerator (R) similar to that of the above-mentioned Embodiment 2 can be obtained. Particularly, in this embodiment, the mesh body (4) is formed by the wires (3), (3), ....
Since the metal (6) is coated after knitting, the conventional manufacturing method includes a step of coating the mesh body (4) with the metal (6) and a step of subsequently removing the coating metal (6). Just add
There is an advantage that it can be manufactured without requiring a large process change.

In the second embodiment, the mesh (2)
Since the metal (6) is coated over the entire circumference of each wire (3) of (3), when the metal (6) is removed by the corrosive solution, the wires (3) and (3) in the mesh (2) are There is a gap between them, and a step of re-pressurizing is necessary to restore the original state, but in this embodiment, since the mesh body (4) is knitted and then the metal (6) is coated, it is knitted. The metal (6) is not coated between the intersecting strands (3) and (3) of the mesh body (4), and as a result, the above problem does not occur.

Also in this embodiment, instead of coating the wire (3) of the mesh (2) with the metal (6), a resin coating (6 ') is applied to the surface of the wire (3), The resin coating (6 ') on the surface of the strand (3) may be dissolved and removed with a solvent, and the same effect as the above can be obtained.

In each of the above embodiments, the corrosion of the wire (3) of the mesh (2) is carried out only by immersion in a corrosive solution, but it may be carried out by electrolysis.

Further, the present invention can be applied to a cryogenic refrigerator other than the Stirling refrigerator as in each of the above-mentioned embodiments, and a regenerator in a heat pump device such as a Billmayer heat pump device.

[0043]

As described above, in the case of manufacturing a mesh type regenerator, in the invention of claim 1, the mesh is punched out from the mesh body knitted with the strands by a die,
After the mesh was laminated and filled in a casing, it was immersed in a corrosive solution to corrode the element wires of the mesh, and the diameter of the element wires was scaled down to a predetermined value. Also,
In the invention of claim 2 or 4, after coating the element wire to be a mesh with a metal or resin coating having a greater ionization tendency than that, a mesh body is knitted, the mesh is punched out from the mesh body and filled in a casing, The coating metal or resin coating was removed from the element wire of the mesh by immersion in a corrosive solution or solution. further,
In the invention of claim 3 or 5, the mesh body in which the strands are knitted is coated with a metal or resin coating having a greater ionization tendency than the strands, the mesh is punched out, the mesh is filled in a casing, and then the corrosive solution is added. Alternatively, the coating metal or the resin film is removed from the element wire of the mesh by immersion in a solvent. Therefore, according to these inventions, the mesh can be punched in a highly rigid state to prevent distortion and crushing of the mesh shape, and a mesh having a small wire diameter and a large opening does not cause distortion of the shape. It can be easily obtained, and the use range of the regenerator mesh can be expanded to improve the device performance.

In particular, according to the invention of claim 3 or 5, since the mesh body after knitting is coated with a metal or resin coating, the conventional manufacturing method can be applied to the step of coating the mesh body with the metal or resin coating. It is only necessary to add a process for removing it and the process for removing it, and it is possible to manufacture without requiring a large process change.

[Brief description of drawings]

FIG. 1 is a process diagram showing a first embodiment of the present invention.

FIG. 2 is a process drawing showing Example 2;

FIG. 3 is a process drawing showing Example 3;

[Explanation of symbols]

 (R) Regenerator (1) Casing (2) Mesh (3) Element wire (4) Mesh body (6) Metal having a greater ionization tendency than the element wire (6 ') Resin coating

Claims (5)

[Claims] 1. A casing (1) comprising a large number of meshes (2), (2), ... Stacked and filled, and heat-exchanged with a gas passing through the meshes (2), (2) ,. And a method for manufacturing a regenerator for heating gas, comprising a mesh body (4) in which strands (3), (3), ... Are knitted.
From the mesh (2) to the casing (1),
After punching (2), ..., the mesh (2),
(2), ... are stacked and filled in the casing (1), and the wire (3) of the mesh (2) is corroded by a corrosive solution to scale down the diameter of the wire (3) to a predetermined value. And a method for manufacturing a regenerator. 2. A casing (1) comprising a large number of meshes (2), (2), ... Stacked and filled, and heat exchanged with gas passing through the meshes (2), (2) ,. And a method of manufacturing a regenerator for heating gas, comprising: coating a wire (3) forming a mesh (2) with a metal (6) having a greater ionization tendency than the wire (3),
A mesh body (4) is knitted by the coated strands (3), (3), ..., and the mesh bodies (2), (2), ... Are fitted from the mesh body (4) to the casing (1). After punching, the mesh (2), (2), ... Is laminated and filled in the casing (1), and the metal (6) coated from the wire (3) of the mesh (2) with a corrosive solution. A method for manufacturing a regenerator, which comprises corroding and removing the. 3. A casing (1) comprising a large number of meshes (2), (2), ... Stacked and filled, and heat-exchanged with a gas passing through the meshes (2), (2) ,. And a method for manufacturing a regenerator for heating gas, comprising a mesh body (4) in which strands (3), (3), ... Are knitted.
After coating the metal (6) having a greater ionization tendency than the wire (3), the mesh (2), (2), ... are punched out from the mesh body (4) according to the casing (1), and then, The meshes (2), (2), ... Are stacked and filled in the casing (1), and the coated metal (6) is removed from the wire (3) of the mesh (2) by corrosive solution. A method for manufacturing a regenerator, comprising: 4. A casing (1) comprising a large number of meshes (2), (2), ... Stacked and filled, and heat-exchanged with a gas passing through the meshes (2), (2) ,. And a method of manufacturing a regenerator for heating gas, comprising coating a resin coating (6 ') on a wire (3) which is a mesh (2), and coating the coated wire (3), (3). ), ... knit the mesh body (4),
After punching the meshes (2), (2), ... From the mesh body (4) according to the casing (1), the meshes (2), (2) ,. Then, the coated resin film (6 ') is dissolved and removed from the wire (3) of the mesh (2) with a solvent, and the method for producing a regenerator. 5. A casing (1) comprising a large number of meshes (2), (2), ... Stacked and filled, and heat exchanged with gas passing through the meshes (2), (2) ,. And a method for manufacturing a regenerator for heating gas, comprising a mesh body (4) in which strands (3), (3), ... Are knitted.
After coating a resin coating (6 ') on the above, meshes (2), (2), ... Are punched out from the mesh body (4) in accordance with the casing (1), and then the meshes (2), (2), Of the regenerator characterized by stacking and filling the casing (1) with the solvent, and dissolving and removing the coated resin film (6 ') from the wire (3) of the mesh (2) with a solvent. Production method.