JP2000266420A - Refrigerator, compressor, and expander, and manufacture of refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator to hardly cause the occurrence of leakage and be manufactured with high workability. SOLUTION: A gas introduction part 55 of a compressor 13 of a refrigerator comprises a valve 45 the internal space of which is sealed by an elastomer plug 45a; and a valve cap 46 formed that an internal space sealed by the valve 45 is sealed by a metal seal 47. The compressor 13 of the constitution is manufactured in such procedures that various manufacturing processes except a final process are carried out with only the valve 45 mounted thereon, and at a final process the valve cap 46 is further mounted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator and a method of manufacturing a compressor, an expander, and a refrigerator used to constitute the refrigerator.

[0002]

2. Description of the Related Art In small refrigerators such as a split type Stirling refrigerator and a pulse tube refrigerator, most of the components are connected by welding. Some parts are configured to be decomposable.

For example, as shown in FIG. 3, an expander (cold head) 71 of a split type Stirling refrigerator is used.
Consists of a displacer 73 and an outer container for accommodating the displacer 73. When the expander 71 is manufactured, the displacer 73 may be taken out after assembling in the form shown in the figure. For this reason, the outer container of the expander 71 is formed by fixing a cap portion 75 with a bolt (not shown) to a cylinder portion 72 manufactured by welding several parts, with a sealing member 74 interposed therebetween. It is configured. Further, the compressor 81 is provided with a gas inlet 82 for filling a refrigerant gas (normally, helium) into the refrigerator, and a valve 83 having a seal plug 83a at a tip after the refrigerant gas is charged. The gas introduction part 82 is provided.

The cap portion 75 and the valve 83 have good follow-up performance with respect to the dynamic pressure, and the refrigerant gas (usually helium)
It is desired to be attached to the cylinder section 72 and the gas introduction section 82 in a state where the sealing performance against the gas is high. It is also desired that the device can be easily removed and reattached. That is, it is desired that the seal member 74 and the seal plug 83a satisfy the above conditions, but the existing elastomer seal material and metal seal material cannot satisfy all the above conditions. Has become. That is, in general, the followability with respect to the dynamic pressure is better with the elastomer seal, and the seal with respect to the refrigerant gas is better with the metal seal. In addition, when an elastomer seal is used, parts can be easily attached and detached, and the elastomer seal itself can be reused.However, when a metal seal is used, skill is required to perform a good installation. However, once used metal seals cannot be reused.

[0005] As described above, a seal having characteristics different from those of the elastomer seal and the metal seal is obtained. For this reason, conventionally, at the time of assembling, an elastomer seal was used with priority on workability, and a metal seal was attached instead of the elastomer seal immediately before final shipment as a product. That is, a member made of an elastomer material is used as the seal member 74,
After assembling and adjusting the valve 83 using a seal plug 83a made of an elastomer material, the seal member 74 is changed to a metal material.
Further, an operation of changing the valve 83 to one having a seal plug 83a made of a metal material has been performed.

[0006]

As described above, since refrigerators conventionally shipped as products use metal seals, the refrigerators follow the dynamic pressure of the metal seals when operated for a long period of time. Leaks sometimes occur due to poor properties.

[0007] At the time of manufacture, replacement of seals is performed. However, in order to replace seals without causing contamination inside the refrigerator, work must be performed in special equipment such as a clean bench. Was needed. That is, the conventional refrigerator has a configuration that requires a high manufacturing cost.

[0008] Therefore, an object of the present invention is to provide a refrigerator, a compressor, and an expander that are less likely to leak.

Another object of the present invention is to provide a method of manufacturing a refrigerator that can easily manufacture a refrigerator that is less likely to leak.

[0010]

In order to solve the above-mentioned problems, a refrigerator according to the present invention comprises a first seal portion for sealing an internal space with an elastomer seal in an opening provided in an outer container connected to the internal space. And a second seal portion for sealing the internal space sealed by the first seal portion with a metal seal. According to this configuration, 2 is formed by the elastomer seal and the metal seal.
Since the double sealing is performed, the internal space can be sealed in a form that makes use of the advantages of both sealing materials.
Therefore, the refrigerator of the present invention functions as a refrigerator that has good followability to dynamic pressure and is sealed with high sealing properties, that is, a refrigerator in which leakage is extremely unlikely to occur.

In the compressor of the present invention, a first seal portion for sealing the internal space is formed by an elastomer seal and a first valve in a gas introduction portion for introducing a refrigerant gas into the internal space. It has a configuration in which a second seal portion for sealing an internal space sealed by one seal portion with a metal seal and a second valve is formed. According to this configuration, since a double seal is performed by the elastomer seal and the metal seal, the internal space can be sealed in a form that makes use of the advantages of both seal materials. Therefore, the compressor of the present invention functions as a compressor that has good follow-up to dynamic pressure and is sealed with high sealing properties, that is, a compressor in which leakage is extremely unlikely to occur.

When implementing the compressor of the present invention,
In order to facilitate the formation of the first seal portion,
For example, it is desirable to integrate the elastomer seal and the first valve by performing processing such as attaching a seal member made of an elastomer material to the tip of the first valve in advance.

Further, the expander of the present invention includes a displacer, a cylinder portion having a portion functioning as a cylinder of the displacer, and a cap portion fixed to the cylinder portion to form an outer shell container of the displacer. An expander, wherein a first seal portion sealing an internal space of a cylinder portion with an elastomer seal between a cap portion and a cylinder portion, and an internal space sealed by the first seal portion is sealed with a metal seal. It has a configuration in which a second seal portion is formed. According to this configuration,
Since double sealing is performed by the elastomer seal and the metal seal, the inner space of the expander can be sealed in a form that makes use of the advantages of both seal materials.
Therefore, the expander of the present invention functions as an expander that has good follow-up to dynamic pressure and is sealed with high sealing performance, that is, an expander in which leakage is extremely unlikely to occur.

When manufacturing the refrigerator of the present invention, or the refrigerator having the expander or the compressor of the present invention, the manufacturing steps except for the final step in the manufacturing steps which require the inner space to be sealed are as follows. If the procedure of forming only the first seal portion in the opening, the gas introduction portion or between the cap portion and the cylinder portion, and forming the second seal portion in the final step is adopted, the replacement of the seal can be performed. Since the refrigerator can be manufactured without performing it, the manufacturing cost of the refrigerator can be reduced.

[0015]

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

The refrigerator according to one embodiment of the present invention is a so-called split-type Stirling refrigerator, and comprises an expander (cold head), a compressor, and a capillary tube connecting them. FIG. 1 shows a configuration of an expander of a refrigerator according to the embodiment, and FIG. 2 shows a configuration of a compressor. The configuration of the expander and the compressor shown in the drawing is the configuration at the time when the manufacture (assembly) of the refrigerator is completed, that is, the configuration at the time of shipment. Hereinafter, a configuration and a manufacturing procedure of the refrigerator according to the embodiment will be described with reference to these drawings.

As shown in FIG. 1, the expander (cold head) 11 includes a displacer 20 and a cylinder pipe 2.
1, a cold tip 22, a cylinder holder 23, a holder cap 24, and a coil spring 25.

The displacer 20 is a kind of piston containing a regenerator material (such as a wire net) for heat exchange, and has a cylindrical spring seat having a spiral groove formed on one end at one end thereof. I have. The cylinder pipe 21 is a member in which the displacer 20 reciprocates inside, and a cold tip 22 and a cylinder holder 23 are fixed to both ends thereof.

The cold tip 22 is a cylinder pipe 2
1 is a member having a shape capable of closing one end of
It is fixed to the cylinder pipe 21 by silver brazing or the like.
The cylinder holder 23 is made of a material having good thermal conductivity,
The cylinder pipe 21 has a columnar cavity 60 fixed by silver brazing or the like. The cylinder holder 23 is provided with the expander 1 including the cylinder pipe 21 and the columnar cavity 60.
1 also has a conduit 61 for connecting the space in the compressor to the space in the compressor via the capillary tube 12. Hereinafter, for convenience of description, a portion including the cylinder pipe 21, the cylinder tip 22, and the cylinder holder 23 is referred to as a cylinder portion.

The holder cap 24 is a member fixed to the cylinder holder 23 by bolts 28 in order to form a space in the expander 11 which is communicated only with the outside world (the internal space of the compressor) via the capillary tube 12. It is.
The holder cap 24 has a disc-shaped portion that contacts the end face of the cylinder holder 23 and the columnar cavity 6 of the cylinder holder 23.
A cylindrical portion having an outer diameter slightly smaller than the inner diameter of 0 and having a groove formed on the outer periphery thereof. Further, the holder cap 23 includes a columnar portion (hereinafter referred to as a spring seat portion) having a spiral groove formed on the outer periphery, and a coil spring 25 is provided between the spring seat portion and the spring seat portion of the displacer 20. Is inserted and fixed to the cylinder holder 23 (cylinder portion) in a state in which is attached. That is, the holder cap 23 is fixed to the cylinder portion in a state where the displacer 20 is attached by the coil spring 25.

When the displacer 20 needs to be subsequently removed, the holder cap 23 is provided with the elastomer seal 2 in a groove provided on the outer periphery of the cylindrical portion.
6 (so-called O-ring) is fixed to the cylinder part (cylinder holder 23). That is, in a state where the seal between the holder cap 24 and the cylinder portion is performed only by the elastomer seal 26,
The holder cap 24 is fixed to the cylinder holder 23.

When it is no longer necessary to remove the displacer 20, the holder cap 24 is fixed to the cylinder in such a manner that the metal seal 27 is arranged on the contact surface with the cylinder holder 23. That is, when the displacer 20 does not need to be removed, a state in which the seal between the holder cap 24 and the cylinder portion is performed by the elastomer seal 26 and the metal seal 27 is formed.

As shown in FIG. 2A, the compressor 13 used in the refrigerator according to the embodiment has a symmetrical structure, and has a center portion 31 and a center portion 31. It includes a cylinder portion 32 fixed to each surface, a pressure-resistant casing 40, and a hermetic connector 41 fixed to the pressure-resistant casing 40.

The center section 31 has a gas introduction section 55 for introducing a refrigerant gas (normally, helium) into the compressor 11.
(Details will be described later).
2 and a cavity 56 for connecting to the space inside the expander 11 via the air compressor 2.

The hermetic connector 41 is a member that forms a closed space in which the cylinder portion 32 and the like are housed together with the pressure-resistant casing 40. Hermetic connector 41
Has a cylindrical spring seat 4 having a spiral groove formed on its surface.
2 and two current introduction terminals 43 are provided. The cylinder portion 32 has a columnar cavity 58 connected to the cavity portion 56 of the center portion 31, and a groove 59 concentric with the cavity 58. An annular magnet 33 is attached to the cylinder portion 32 so as to form an inner wall outside the groove 59.

The compressor 13 has a compression piston 34,
It has a piston portion composed of a spring seat 37 having a spiral groove formed on its surface, an annular coil 36, and a member 35 for fixing the compression piston 34 and the coil 36 to each other. The compression piston 34, which is an element of the piston part,
The coil 36 is inserted into the second cylindrical cavity 58, and the coil 36 is inserted into the annular groove 59 of the cylinder portion 32. Further, the compressor 13 includes a spring seat 37 fixed to a compression piston 34.
And a coil spring 38 having both ends attached to a spring seat 42 of a hermetic connector 41, and a cord 39 connecting the coil 36 and the current introducing terminal 43.

As described above, the basic configuration of the compressor 13 is the same as that of a normal compressor.
As shown in FIG. 2 (B),
It has a shape that can be sealed by a valve 45 to which a seal plug 45a made of an elastomer material is attached and further sealed by a metal seal 47 and a valve cap 46. In addition, the valve 45,
The valve cap 46 is a male screw having the same nominal diameter and pitch, and the gas introduction part 55 is a female screw corresponding to them.

In the manufacturing process of the compressor 13, it is necessary to seal the inside of the compressor 13 (refrigerator), and thereafter, there is a possibility that refrigerant gas may be taken in and out of the gas inlet 55. Is the valve 4
This is performed with only 5 attached. Then, when it is no longer necessary to take the refrigerant gas in and out of the gas inlet 55, the valve cap 46 is attached to the gas inlet 55 with the metal seal 47 interposed therebetween.

As described above, the refrigerating machine according to the embodiment has a configuration in which the removable portion can be double-sealed with the elastomer sealing material and the metal sealing material. Since it has a structure that can be sealed, it can be manufactured at low cost and easily. In addition, since the removable portion is ultimately double-sealed with the elastomer sealing material and the metal sealing material, the refrigerator functions as a refrigerator in which leakage is extremely unlikely to occur.

The refrigerator according to the embodiment is a split-type Stirling refrigerator.
It goes without saying that a pulse tube refrigerator may be configured. In addition, it goes without saying that the specific configuration of the gas introduction unit 55 and the like may be different from that shown in the embodiment.

[0031]

According to the present invention, it is possible to obtain a refrigerator in which a leak is less likely to occur. According to the manufacturing method of the present invention, such a refrigerator can be easily manufactured.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an expander provided in a refrigerator (split-type Stirling refrigerator) according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a compressor included in the refrigerator according to the embodiment.

FIG. 3 is a configuration diagram of a conventional refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Expander (cold head) 12 Capillary tube 13 Compressor 20 Displacer 21 Cylinder pipe 22 Cold tip 23 Cylinder holder 24 Holder cap 25, 38 Coil spring 26 Elastomer seal 27 Seal member 28 Bolt 31 Center part 32 Cylinder part 34 Compression piston 36 Coil 39 Code 40 Pressure-resistant casing 41, 46 Hermetic connector 42 Spring seat 43 Current introduction terminal 45 Valve 45a Seal plug 46 Valve cap 47 Metal seal 55 Gas introduction section

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Yoshitaka Ikuta 63-30 Yuyugaoka, Hiratsuka-shi, Kanagawa Prefecture Sumitomo Heavy Industries Machinery Co., Ltd. No. 30 Sumitomo Heavy Industries Machinery Co., Ltd. Hiratsuka Office

Claims (7)

[Claims] A first seal portion for sealing the internal space with an elastomer seal in an opening provided in an outer container connected to the internal space, and the internal space sealed by the first seal portion is sealed with a metal seal. A refrigerator having a second seal portion for sealing. 2. A compressor for a refrigerator having a gas introduction portion for introducing a refrigerant gas into an internal space, wherein a first seal for sealing the internal space with an elastomer seal and a first valve in the gas introduction portion. A compressor, wherein a seal portion is formed, and a second seal portion is formed to seal the internal space sealed by the first seal portion with a metal seal and a second valve. 3. The compressor according to claim 2, wherein said elastomer seal and said first valve are integrated. 4. A cap comprising: a displacer; a cylinder portion having a portion functioning as a cylinder of the displacer; and a cap portion fixed to the cylinder portion to form an outer shell container of the displacer. A first seal portion for sealing the internal space of the cylinder portion with an elastomer seal between the cylinder portion and the cylinder portion, and a second seal portion for sealing the internal space sealed by the first seal portion with a metal seal. Is formed. 5. A first seal portion for sealing the internal space with an elastomer seal in an opening provided in an outer container connected to the internal space, and the internal space sealed by the first seal portion is sealed with a metal seal. A method of manufacturing a refrigerator having a configuration capable of forming a second seal portion to be sealed, wherein a manufacturing process except for a final process in a manufacturing process in which the internal space is required to be sealed is performed inside the opening. Forming the first seal portion only, and forming the second seal portion in a final step. 6. A first seal portion having a gas introducing portion for introducing a refrigerant gas into an internal space, wherein the first seal portion seals the internal space with a first valve provided with an elastomer seal in the gas introducing portion. A method for manufacturing a refrigerator including a compressor having a configuration capable of forming a second seal portion that seals the internal space sealed by a first seal portion with a metal seal and a second valve, the method comprising: Manufacturing steps except for the final step in the manufacturing steps that need to be sealed are performed by forming only the first seal section in the gas introduction section, and forming the second seal section in the final step. A method for manufacturing a refrigerator. 7. A displacer, and a cylinder having a portion functioning as a cylinder of the displacer;
A cap part being fixed to the cylinder part to form an outer shell container of the displacer, and between the cap part and the cylinder part, an internal space of the cylinder part is sealed with an elastomer seal. A method for manufacturing a refrigerator including an expander having a configuration capable of forming a first seal portion and a second seal portion that seals the internal space sealed by the first seal portion with a metal seal. The manufacturing steps except for the final step in the manufacturing steps that require the space to be sealed are performed by forming only the first seal portion between the cap portion and the cylinder portion. 2. A method for manufacturing a refrigerator, comprising forming two seal portions.