JP3001542B1 - Cooling system - Google Patents

Abstract

[PROBLEMS] To develop a phase adjusting means which has the same function as a conventional phase adjuster (hollow thin tube), satisfies the requirements of air permeability and air tightness, and is excellent in heat dissipation. An apparatus for cooling a chamber by operating a pulse tube refrigerator placed in a chamber by a compressor provided outside the chamber, comprising: a pulse tube; and a phase adjustment connected to the pulse tube. A cooling device comprising, as main components, a means 23, a buffer tank connected to the phase adjusting means, and a wall material forming a chamber, and a part of the wall material is capable of bonding two metal plates. A groove 17 is formed on the surface to be bonded, a metal plate is bonded, a ventilation path is formed by the groove, and the entrance of the groove is formed at the tip of a pulse tube (or a hollow tube connected to the pulse tube). By connecting and connecting the outlet of the groove to the hollow tube connected to the buffer tank, the heat radiation effect can be further enhanced while maintaining the phase adjustment function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved technique of a phase adjusting means provided at a tip of a pulse tube of a pulse tube refrigerator placed in a chamber. More specifically, the phase adjusting means is provided in a wall material forming a chamber. The present invention relates to a cooling device having a compact structure that also serves as a cooling device.

[0002]

2. Description of the Related Art In a satellite or a ground relay station for mobile communication, high sensitivity and interference reduction are achieved at the time of reception. To achieve this goal, a relay station or the like needs a high-temperature superconducting filter and a low-noise amplifier. The former high-temperature superconducting (HTS) filter has been able to operate near liquid nitrogen temperature (about 70 K) by using a YBCO film in recent technology. Also, the latter low noise amplifier (LNA) is housed in a low-temperature chamber, taking advantage of the advantage that the noise is lower at lower temperatures.

Thus, at a temperature of about the temperature of liquid nitrogen,
In order to operate the HTS filter and the LNA, a cooling chamber and a cooling means capable of accommodating these devices are indispensable. However, the demands of the times cannot be met without high cooling efficiency, low maintenance, and excellent cooling technology. However, at the present time, it is said that some refrigerators of the third generation pulse tube refrigerator have extremely high cooling efficiency and reach a low temperature of about 30 to 50K.

[0004] Therefore, as a refrigerating means, a pulse tube refrigerator was first taken up, and it was examined that the inside of the chamber containing the HTS filter and the LNA was cooled by the pulse tube refrigerator. Was found to be further required. HTS filter and LNA
In addition, the pulse tube portion of the refrigerator and the phase adjusting means occupy a place in the chamber. The buffer tank at the end of the phase adjustment means can be placed outside the chamber,
The main part of the phase adjusting means consisting of a hollow tube is located in the chamber and has a considerable volume, so that in addition to the phase adjustment, a heat dissipation function is required. Therefore, it is necessary to reduce the size of the phase adjusting means while maintaining and improving the function, and it is necessary to further improve the fundamental technology.

Here, the prior art will be described first with reference to the drawings. FIG. 6 shows a pulse tube refrigerator as an example of the prior art. In the prior art, the compressor 50 is operated to operate the pulse tube refrigerator 30 (including mechanical parts such as a regenerator and a low-temperature end).
Hollow tube 13 connected to the tip of pulse tube portion 11
(Usually about 1 to 3 mm in inner diameter), and a buffer tank 18 provided at the end of the phase adjuster. The pulse tube refrigerator has the same chamber 4
Since the cooling target, such as a high-temperature superconducting filter in 0, is used for cooling and functioning, it is required that the pulse tube refrigerator itself and the phase adjusting means themselves occupy as little space as possible in the chamber. Therefore, it is necessary to devise a device that does not occupy a large area. In addition, efficient heat dissipation is required together with the phase adjustment function.

[0006]

Means for Solving the Problems The structure of a thin tube of a phase adjuster is formed by forming a groove in a bonding surface of a metal sheet made of a metal curved surface or a flat surface that can be brought into close contact with each other, so as to be equivalent to a thin tube. The structure is changed to a structure in which air permeability is given, and at the same time, the surfaces other than the grooves are tightly adhered so as to be airtight. This metal plate is a material that can be used for the walls, ceiling, and floor of the chamber, and is hereinafter referred to as a “phase adjusting member”. Means for bringing the two metal plates into close contact with each other in an airtight manner can be exemplified by a known method, for example, welding or joining with an adhesive. The same material is preferable because the brazing surface is brazed, but of course, another material may be used as long as airtightness can be maintained by joining and sufficient mechanical strength is provided.

[0007] The phase adjuster as a substitute for the phase adjuster of the present invention has a function similar to that of a hollow thin tube. It is a few steps better. Since the two grooves formed in the metal plate are attached to each other, extremely various groove patterns can be designed.
Further, the material of the metal plate can be appropriately selected, a material having excellent thermal conductivity is selected, and the material of the portion other than the bonding surface (groove) is made of silver or copper which is easy to dissipate heat. It is also possible to process the outer shape into a shape having a large surface area, such as a fin.

[0008] The invention of claim 1 is an apparatus for cooling the inside of a chamber (including an object to be cooled) by operating a pulse tube refrigerator placed in the chamber by a compressor provided outside the chamber. A pulse tube placed in the chamber, a phase adjusting unit connected to the pulse tube, a buffer tank connected to the phase adjusting unit, and a wall material forming the chamber, and a part of the wall material. Is composed of a phase adjusting member formed by bonding two metal plates, and at least one bonding surface of the metal plate forming the phase adjusting member is subjected to a groove processing, whereby the ventilation path is formed by the groove. One end (inlet) of the groove of the phase adjusting member is connected to the tip of the pulse tube or a hollow tube connected to the pulse tube, and the other end (outlet) of the groove of the phase adjusting member is formed. Into the hollow tube connected to the buffer tank. By the capillary made of metal or the like, by changing the metal 鈑 grooved, it is possible to enhance the heat dissipation effect while maintaining a phase adjusting function. Moreover, the effective volume inside the chamber can be expanded.

According to a second aspect of the present invention, there is provided a phase adjusting means in which the buffer tank is disposed so as to be in contact with the grooved phase adjusting member. By connecting the phase adjusting member and the buffer tank, a more compact configuration is obtained, and H
A sufficient space for accommodating the TS filter, the LNA, and the like can be secured, and the entire chamber can be reduced in size. Claim 3
The invention has a configuration in which the entire buffer tank is housed in a phase adjusting member, and the entire refrigeration system including the chamber is made compact.

[0010]

[Function] A pulse tube refrigerator mainly includes a compressor, a regenerator,
It is composed of a pulse tube and a phase adjusting means, of which a part of the pulse tube and the phase adjusting means is housed in a freezing chamber. The phase of the compressor and the phase adjusting means are adjusted so that the phases of compression and expansion do not coincide with each other. Part of the phase adjusting means mainly composed of the groove portion has a phase adjusting function of the thin hollow tube and a heat radiating function by heat transfer around the groove, and a buffer tank is connected to an end of the phase adjusting member. When the phase adjustment functions properly, heat energy is transferred from the compression state to the expansion state, heat is pumped from the low temperature chamber to the phase adjustment member, and the object to be cooled in the chamber is further cooled. In other words, the phase between the pressure and the displacement in the pulse tube is adjusted by the phase adjusting means, the work flow is amplified and optimized, and the work flow is converted into amplified heat. Can be generated. Therefore, the function of the phase adjusting member of the present invention, which is also a wall material of the chamber, is important. The material and groove shape of the phase adjusting member affect the performance of the cooling device of the present invention.

If the phase adjustment by the phase adjusting means is inappropriate, the work flow is canceled, so that a sufficient work flow cannot be obtained and the cooling efficiency after heat conversion is reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A phase adjusting member according to the present invention comprises a grooved surface and an opposing surface (or two grooved surfaces to be abutted), and at least one surface is grooved. In addition, as a material of the phase adjusting member, copper, silver, tin, a silver alloy, and a copper alloy having a high thermal conductivity in a portion in contact with the groove are preferable. Of course, for example, a combination of two layers in which the groove processing surface (brazing surface) is a copper layer and the outside thereof is a steel plate may be used. A laminated laminated material of such a grooved laminated plate and a non-processed metal plate serving as an opposing surface is shown. It is good to select the same material copper as the material of the opposing surface (brazing surface) to facilitate bonding. Of course, in this case as well, a single layer may be used, or a laminated laminate of copper and another metal plate may be used.

The width and depth of the groove may be, for example, about 0.1 to 10 mm, and the cross section may be U-shaped or semicircular. In this shape, grooves can be formed on both surfaces of the two bonded plates to form grooves having an elliptical or circular cross section.
This will be described in more detail with reference to the drawings. FIG. 1 is a schematic diagram showing one embodiment of the present invention. The portion of the hollow thin tube 13 of the phase adjuster 10 connected to the tip of the pulse tube 11 is connected to a grooved wall material (phase adjusting member 2) on the ceiling 15 of the chamber.
An example in which the substitution is performed is shown in 3). In this drawing, the buffer tank 18 is placed in the chamber 40.

FIG. 2A shows an example of the shape of the groove 17 of the phase adjusting member 23 used in the present invention, showing the manner in which the groove width changes, and FIG. ). FIG. 3A shows an embodiment corresponding to claim 2 of the present invention. Buffer tank 18 is a phase adjusting member 23
This is an example in which the components are connected and arranged so as to be in contact with the top of the device. The need for a hollow connecting pipe connected to the buffer tank is eliminated, resulting in a more compact configuration.

When the groove of the phase adjusting member 23 is spiral, the buffer tank 18 is placed on the phase adjusting member. The outlet of the groove is immediately connected to the buffer tank so that the hollow connecting tube can be omitted. FIG. 4A shows another embodiment of the present invention. This is an example in which the buffer tank 18 is in contact with the phase adjustment member 23 and arranged so that both are lined up.
Also in this case, the hollow connecting pipe is not required, and the configuration is compact. The groove pattern provided on the phase adjusting member 23 is shown in FIG.
(B) and FIG. 4 (c) are one plan, and the flow path of the groove is long and heat is sufficiently released.

FIG. 5A shows an embodiment of the cooling device according to claim 3 of the present invention. 5B and 5C, the buffer tank 18 is housed in the phase adjusting member 23, and is extremely compact. The volume of the buffer tank is
Although there is an optimum capacity inherent to the cooler, the one housed in the phase adjusting member can also exhibit a corresponding cooling function.

[0017]

According to the first aspect of the present invention, there is provided an apparatus for cooling a chamber by operating a pulse tube refrigerator placed in the chamber by a compressor provided outside the chamber. The pulse tube, the phase adjusting means connected to the pulse tube, a buffer tank connected to the phase adjusting means, and a wall material forming a chamber are main components, and a part of the wall material is two pieces. A phase adjusting member is formed by laminating the metal plates. At least one laminating surface of the metal plates constituting the phase adjusting member is grooved, and the two metal plates are laminated. A vent is formed by the groove, and one end (inlet) of the groove of the phase adjusting member is connected to a tip of the pulse tube or a hollow tube connected to the pulse tube. The other end (outlet) is connected to the buffer tank By connecting the hollow tube to the cooling tube and connecting it to the cooling device, the metal thin tube was changed to a grooved metal plate, maintaining the requirements of airtightness and air permeability, and providing a phase adjustment function. The effect that the heat radiation effect was able to be further enhanced while maintaining the same is produced.

According to the second aspect of the present invention, since the buffer tank is arranged so as to be in contact with the phase adjusting member which is a wall material such as a wall or a ceiling of the chamber, a connecting pipe composed of a hollow thin tube is not required, and the entire cooling device is not required. The effect of reducing the size was brought about. Further, according to the third aspect of the present invention, the buffer tank is housed in the phase adjusting member, so that an extremely compact cooling device has been born.

The phase adjusting member as a substitute for the phase adjuster of the present invention has a function similar to that of a hollow thin tube. It is a few steps better. Since the two grooves formed in the metal plate are attached to each other, extremely various groove patterns can be designed.
Furthermore, it is also possible to appropriately select the material of the metal plate, select a material having excellent heat conductivity, and easily radiate heat to portions other than the groove.
For example, it can be processed into a surface shape such as a fin.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention. This shows an aspect in which the thin tube portion of the phase adjusting means is replaced with a grooved wall material.

FIG. 2 is a schematic diagram showing one embodiment of the present invention. This is an example showing the shape of the groove of the phase adjusting member, and is an example in which the groove has a spiral shape in addition to the mode in which the groove width changes.

FIG. 3 is a schematic view showing another embodiment of the present invention. An example in which a buffer tank is connected and arranged so as to be in contact with a phase adjusting member. The need for a hollow connecting pipe connected to the buffer tank is eliminated, resulting in a more compact configuration.

FIG. 4 is a schematic view showing another embodiment of the present invention. An example in which a buffer tank is in contact with a phase adjusting member and connected so that both are lined up. Also in this case, a hollow connecting pipe is not required, and a compact configuration is obtained.

FIG. 5 is a schematic view showing still another embodiment of the present invention.
The buffer tank is housed in the phase adjustment member and is extremely compact.

FIG. 6 is a schematic view showing an example of the prior art, in which the phase adjuster is formed of a hollow thin tube and occupies a part of the space of the freezing chamber.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 phase adjusting means 11 pulse tube portion of pulse tube refrigerator 13 hollow thin tube provided at tip of pulse tube refrigerator 15 wall of chamber 17 groove processed in wall material (metal plate) 18 buffer tank 19 phase adjustment with thin tube Connection part with member 21 Metal plate constituting wall material 23 Phase adjustment member 30 Pulse tube refrigerator 40 Chamber 50 Compressor

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F25B 9/00 311

Claims (3)

(57) [Claims] An apparatus for cooling a chamber by operating a pulse tube refrigerator placed in a chamber by a compressor provided outside the chamber, comprising: a pulse tube placed in the chamber; A phase adjusting means connected to the pulse tube; a buffer tank connected to the phase adjusting means; and a wall material forming a chamber, wherein a part of the wall material is formed by laminating two metal plates. A groove is formed on at least one bonding surface of the metal plate constituting the phase adjustment member, and a ventilation path is formed by the groove; one end of the groove of the phase adjustment member Is connected to the tip of the pulse tube or the hollow tube connected to the pulse tube, and the other end of the groove of the phase adjustment member is connected to the hollow tube connected to the buffer tank. . 2. A cooling device comprising a buffer tank arranged in contact with the phase adjusting member according to claim 1. 3. A cooling device in which a buffer tank is accommodated in the phase adjusting member according to claim 1.