JPS6338862A - Refrigerator with heat pipe - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a refrigerator mainly intended for cooling to a cryogenic temperature region (for example, −100° C. or lower).

(Prior technology) Used in a vacuum atmosphere, a regenerator is inserted into a thin-walled cylinder, and the regenerator is moved back and forth, and high-pressure gas is injected into the cylinder, internally expanded, and gas is discharged to continuously cool the cylinder. In a Simon expansion type refrigerator such as the Gifford-McMahon refrigerator, the cold generated is mainly concentrated in the residual gas in the expansion chamber inside the thin-walled cylinder. Therefore, in order to cool any location, use a material with good thermal conductivity (such as a copper plate, aluminum plate, rod, etc.).
Method 1 of thermally connecting the expansion chamber and the object to be cooled requires many installation measures, such as bringing the expansion chamber and the object to be cooled into direct contact.

(While the invention is trying to solve the problem; a barrier) When the temperature of the object to be cooled changes dramatically before and after cooling, it is necessary to take into account the deformation of the object due to thermal contraction, and the flexibility is designed to take this into account. Injury such as having to give above
1. There were quite a few.

The present invention has been made in view of the above circumstances, and it makes the installation location and situation of the refrigerator unrestricted, and facilitates the connection between the expansion chamber, which is the source of refrigeration, and the object to be cooled. The purpose is to prevent stress caused by thermal contraction of the object to be cooled from being directly applied to the refrigerator.

[Structure of the invention]

(Means for Solving the Problems) The present invention was made to solve the above-mentioned object, and the condensing end of the heat pipe is brought into thermal contact with the outer wall of the expansion chamber of the refrigerator, and the other end of the heat pipe is evaporated. The heat pipe is brought into thermal contact with the object to be cooled, and the heat pipe is made flexible.

(Function) Since a flexible heat pipe connects the outer wall of the refrigeration n-expansion chamber and the object to be cooled, extremely low temperature refrigeration can be performed safely, reliably, and effectively regardless of the position of the refrigerator body. Can be done.

(Example) The present invention will be described below with reference to an example shown in FIGS. 1 and 2.

The refrigerator shown in Figure 1 has an upper drive! I! lI mechanism (1
), the regenerator shown in Fig. 2 inside the thin-walled cylinder (2) (
9), the high-pressure working gas from a compressor (not shown) is taken in through the inflow valve (3), internally expanded, and then sent back to the compressor through the low-pressure gas outflow valve (4). ing.

The thin-walled cylinders (2), (2) that become cold are usually installed inside the vacuum container (10), but the expansion chambers (5), (5)
) are the first and second stage heat pipes (6a) on the outer periphery of the
, (6b) first stage and second stage condensing section (5a) , (
5b) is mounted in thermal contact. (Hereinafter, the distinction between the names of the first stage and the second stage will be omitted.) Each heat pipe (6a).

The other ends of (6b) are evaporation sections (7a) and (7b), respectively.
and is in thermal contact with the objects to be cooled (8a) and (8b).

FIG. 2 shows a main part of FIG. 1 as a sectional view. Inside the two thin-walled cylinders (2), there is a regenerator (9) in which a container (9a) made of a low thermal conductivity material is filled with a heat storage material (9b) such as a copper wire mesh or small lead particles, and a sealing member (
11) is installed to maintain airtightness.

Figure 2 shows a regenerator (9) installed in two stages, and an expansion chamber (5).
Although this is an example of installing in two stages, it may be installed in a single stage or three stages.

The heat pipe condensing parts (5a) and (5b) are installed on the outer circumferential side of each expansion chamber, so that they can easily receive the cold temperature of the expansion chamber (5).

The condensing parts (5a) and (5b) are installed so as to substantially cover the height of the expansion chamber (5). Heat pipe (6a)
, (6b) connects the condensing sections (5a), (5b) and the evaporating sections (7a), (7b), so they are made flexible, and a wick is inserted inside if necessary.

Internal wicks are used when the inner diameter of the heat pipes (6a) and (6b) is narrow, or when the evaporation sections (7a) and (7b) are located in the F section compared to the respective condensation sections (5a) and (5b). I will use it for commercial purposes.

Next, the operation of this embodiment will be explained.

As mentioned above, the expansion chamber (5) is the place where the cold temperature of the refrigerator is generated.
The condensing parts (5a) and (5b) of the heat pipe are installed on the outside, and the evaporation part is installed on the surface of the object to be cooled (8), and both are connected using a pipe or a wick pipe (each with a part of the flexible pipe). (It is also possible to insert the pipe into the pipe or to make the entire pipe a flexible pipe), so the heat absorbed by the internal working medium in the evaporation part (7a) and (7b) is transferred to the condensation part (5a). , By recondensing the heat pipe working medium transferred to the refrigerator in (5b),
The heat generated by the object to be cooled (8) is immediately transferred to the regenerator (9).
The temperature of the object to be cooled (8) can be kept low.

condensing part (5a) of heat pipe (6a), (6b),
(5b) is installed around the expansion chamber (5) and the evaporation section (7a)
, (7b) is installed on the object to be cooled (8), and the two are connected by a flexible pipe, so it is possible to cool the object in a recessed position or movement, which is difficult to directly cool with conventional refrigerators. It becomes possible to efficiently cool objects to be cooled that are accompanied by heat.

FIG. 3 shows another embodiment of the invention. During cooling from room temperature to fairly low temperature, multiple heat pipes using working media with different boiling points and freezing temperatures are used in series to achieve efficient cooling, and depending on the transient state of cooling, the temperature reaches the highest temperature. This is an example of a method in which a heat pipe with good transfer performance is operated continuously to quickly reach the target temperature.

As the working medium at this time, liquids with low boiling points and different boiling points and freezing temperatures, such as neon, argon hydrogen, nitrogen, oxygen, etc., are appropriately selected and used.

In this way, the heat pipe using a working medium with a relatively high boiling point and freezing temperature performs the cooling action first, and when this working medium freezes, the cooling action of the heat pipe stops, and then the boiling point The heat pipe, which has a low freezing temperature, performs the cooling action in stages, so the target temperature is quickly reached.

〔Effect of the invention〕

As explained above, according to the present invention, the usage of the Gifford-McMahon type refrigerator, which had conventionally limited usage conditions, can be expanded, and the heat pipe is made flexible to reduce thermal stress caused by cooling. This also solves problems such as generation of cold water, and enables safe, reliable, and effective freezing of extremely low temperatures regardless of the position of the refrigerator body.

[Brief explanation of drawings]

Fig. 1 is an elevation view showing one embodiment of the refrigerator of the present invention, Fig. 2 is an elevational view showing an embodiment of the refrigerator of the present invention;
The figure is a sectional view of the main part of FIG. 1, and FIG. 3 is an elevational view showing another embodiment. DESCRIPTION OF SYMBOLS 1... Upper drive mechanism, 2... Thin wall cylinder, 3... High pressure gas inflow valve, 4... Low pressure gas outflow valve, 5... Expansion chamber,
5a, 5b...first stage, second stage condensing section, 6a,
6b...1st stage, 2nd stage heat pipe, 7a, 7b
...Heat vibe evaporation section, 8...Object to be cooled, 9a.
...Cold storage container, 9b... Heat storage material. 10...Vacuum container. Agent Patent Attorney Ito - Male Figure 1: Sacrificial Room 2 Figure

Claims (2)

[Claims] (1) In a refrigerator that utilizes residual gas in the container and a temperature drop in the container wall due to the expansion of high-pressure gas inside the container, the condensing part of the heat pipe is brought into thermal contact with the outer wall of the container, and the evaporating part of the heat pipe is A refrigerator with a heat pipe, characterized in that the heat pipe is in thermal contact with an object to be cooled, and the heat pipe is made flexible. (2) A patent claim characterized in that the working medium inside the heat pipe is a low boiling point substance such as neon, argon, hydrogen, nitrogen, or oxygen, and a plurality of heat pipes using different working media are provided in parallel. A refrigerator with a heat pipe according to scope 1.