JPS63201466A - Superfluid helium device - Google Patents

Abstract

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

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a superfluid helium device, and is particularly suitable for significantly improving the cooling effect when an object to be cooled is cooled by immersing it in superfluid helium. Regarding superfluid helium equipment.

[Conventional technology]

In the conventional apparatus, the material to be cooled (for example, an electromotive conductive magnet) is cooled by simply immersing it in superfluid helium produced by the method described in JP-A-59-119789. This is discussed in the 6th International Cryogenic Engineering Conference (1976) P P2S5-162. (P
roc, 6th Int, Cryog, Eng,
Conf.

(1976) pp 159-162). However, these methods simply immerse the material to be cooled in superfluid helium, that is, cool it only by internal heat conduction of superfluid helium.

Now, as a pump for transporting superfluid helium, Cryogenics 26 (1986) p p103-
106 (Cryogenic+s 26 (1986)
), pp. 103-106), there are conventional mechanical centrifugal pumps and Fantin pumps that utilize the "thermo-mechanical effect" unique to superfluid helium. Although this Fantine pump is simple and has no moving parts, it requires a heat source for driving, and no consideration was given to the fact that this heat source places a large heat load on superfluid helium. In addition, centrifugal pumps have moving parts and are unreliable at extremely low temperatures in the superfluid helium temperature range.

[Problem that the invention seeks to solve]

In the above conventional technology, a substance to be cooled is immersed in superfluid helium and cooled only by internal heat conduction of the superfluid helium. In particular, the substance to be cooled is immersed in superfluid helium in a small cooling channel provided within the substance to be cooled. No consideration was given to the fact that when the heat flux flowing through the helium bath increases, the internal heat conduction deteriorates significantly, and as a result, the temperature inside the material to be cooled becomes considerably higher than the temperature of the superfluid helium bath. was there. In addition, even if a forced flow of superfluid helium is formed by a Fantine pump and this is guided into a cooling channel to improve the cooling effect of the superfluid helium in the channel, the heat source for driving the Fantine pump may be No consideration was given to the increase in heat load on superfluid helium due to

An object of the present invention is to actively cool the device using a fantine pump that uses heat entering the device as a driving heat source.

[Means for solving problems]

The above purpose is to cool the material immersed in superfluid helium.
One or more cooling channels are provided and superfluid helium in the cooling channels.

A forced flow is formed by a Fantin pump installed in a portion communicating with the superfluid helium bath, and the heat flowing into the superfluid helium bath from the outside or the cooled object is used as a heat source for driving the Fantin pump. This is achieved by utilizing the heat generation of the material or other attached equipment in the superfluid helium bath.

[Effect]

A forced flow can be formed in the superfluid helium in the cooling channel of the material to be cooled, increasing the cooling effect of the material to be cooled.
Further, as a method for generating the forced flow, a Fantin pump is used which uses heat that necessarily flows into the superfluid helium as a driving source. As a result, a forced flow is generated in the superfluid helium without increasing the heat load on the superfluid helium, so that the cooling effect of the material to be cooled can be significantly improved without heat loss.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG.

First, the overall configuration will be explained. The upper part of the ordinary liquid helium container 1 contains gas helium 2 (~latm).

4.2 K), and its lower part contains ordinary liquid helium (~1at++, 4.2K)3. The gas helium 2 is passed through a pipe 4 to a valve 5 provided in the normal temperature section.
connected to. The superfluid helium container 6 is filled with superfluid helium 7. The material to be cooled 8 is immersed in the superfluid helium 7.

The liquid helium container 1 and the superfluid helium container 6 are
Tube 4. It is supported by load supports 9a, 9b, 9c, 9d and other structures not shown. Cooled substance 8
is supported by a support 10 connected to a superfluid helium container. The substance to be cooled 8 is connected to the cooling channel 1 of the number
1 and connected to the Fantin pump 12a,
12b allows a forced flow to be generated in the superfluid helium in the cooling channel 11. Liquid helium is injected into the liquid helium container 1 and the superfluid helium container by another liquid helium container (not shown) connected to the valve 13 through a pipe 14, a pipe 15, and a two-way flow valve 1.
6.

The generation and maintenance of superfluid helium 7 includes a filter 17;
JT heat exchanger 18. JT valve 19. He1I heat exchanger 20
．． Cryogenic exhaust pump 21. Heat exchanger 22, pressure regulating valve 2
3. This is carried out by a refrigeration line consisting of a normal temperature exhaust pump 24 and the like. The superfluid helium 7 is cooled by the HalI heat exchanger 20 in the refrigeration line. The liquid helium container 1 and the superfluid helium container 6 are connected by a valve 25 having a passage with a minute heat-insulating surface. As a result, as described in JP-A No. 50-119789, superfluid helium 7 is subcooled superfluid helium (~la
tm, 2.16 or less).

Reference numeral 26 denotes an electrical lead connector, and an electrical lead wire 27 is guided into the superfluid helium 7 via a connector 28 and connected to the substance 8 to be cooled as an electrical lead wire 29. The cryogenic parts of the liquid helium container 1 and the superfluid helium container 6 are covered with a vacuum insulation layer 30. It is surrounded by radiation shield plates 31 and 32 and a vacuum container 33 at room temperature.

Next, the operating principle will be described. Cooling channels 11 are provided in a material to be cooled 8 immersed in superfluid helium 7 . A Fantine pump 12 connected to one end of the cooling channel 11 generates a forced flow in the superfluid helium in the cooling channel, thereby significantly dissipating the heat generated inside the substance to be cooled into the superfluid helium 7. discharge to. The heat that serves as a driving source for the Fantin pump 12 is heat flowing into the superfluid helium 7 from the outside via the load support 9 or the electric wire connector 28, heat generated by the substance to be cooled, or heat generated by the superfluid helium 7. 7. Heat generated by other attached equipment (not shown) in the bath, which inevitably flows into the superfluid helium due to the system configuration, is utilized.

For example, this can be realized as shown in FIGS. 2 and 3. Figure 2 shows a method of utilizing heat penetrating from a high-temperature part through a load support. 34.35 is an epoxy resin (FRP) reinforced with glass fiber or carbon fiber, etc. 36.37 is the load support 9
This is the mounting bracket. 38 is a protruding portion for attaching the load support 9 to the superfluid helium container 6. Fantin pump 39 is installed as shown in 1, and its inlet side is 4
0. This is the exit side 41. A good thermal conductor 42 is provided on the outlet side 41 to be connected to the protrusion 38 to which the load support is attached. As a result, the heat flowing into the protruding portion via the load support 9 is guided to the outlet side of the Fantin pump 39 by the good heat conductor 42, and the Fantin pump acts as a driving heat source for the Fantin pump. 39
The superfluid helium then flows through the tube 43 into the cooling channel 11 of the material 8 to be cooled. Further, in FIG. 8, the Fantin pump 39 is driven by the heat flowing into the superfluid helium 7 through the electric conductor connector 28.

Another embodiment will be explained with reference to FIG. The substance to be cooled 8 is
It is stored in a superfluid helium container 6 and another container 44, and the container 4
4 is a Fantin pump 45a.

Pipes 46a, 46b connected to 45b, 45c.

46c and a pipe 47a connected to the superfluid helium container 6.

The superfluid helium containers 68 are connected via 47b and 47c, and are further connected by a communication pipe 48. The substance 8 to be cooled is immersed in superfluid helium 49 in the container 44 . A plurality of cooling channels 51a, 51b of the substance to be cooled 8 by driving the Fantin pump with the above-described structure.

A forced flow of superfluid helium can be formed at 51c.

Also, the formation of forced flow by Fantin pump.

It is possible to use not only subcooled superfluid helium but also superfluid helium 52 under saturated vapor pressure. That is, the saturated superfluid helium in the heat exchanger 53 between the subcooled superfluid helium 7 and the saturated superfluid helium 52 is circulated by the Fantine pump 54. Furthermore, as shown in FIG. 5, the structure of this heat exchanger 53 is that a heat exchanger 55 is immersed in saturated superfluid helium 52, and subcooled superfluid helium 7 is placed in the tubes of this heat exchanger 55. It is also possible to improve the heat exchange efficiency by circulating the heat with the Fantine pump 56.

Another embodiment will be explained with reference to FIG. 6(a). A superconducting helical coil 58 immersed in subcooled superfluid helium 57 is housed in a helical-shaped container 59. X
-Y indicates one period of the superconducting helical coil 58,
60 is a member that partitions the cooling channel in the container 59 of the superconducting helical coil 58 for each period XY. 6
Reference numeral 1 indicates a connecting portion where the superconducting helical coil 58 is divided and connected every cycle of XY. The fantine pump 62 is arranged every cycle X-Y as shown and sucks in the subcooled superfluid helium 57 to form a subcooled superfluid helium stream 63 that flows to the outlet 64 and is circulated.

FIG. 6(b) shows a superconducting helical coil 58 in which a circulation path is formed every 172 cycles.

Another embodiment will be explained with reference to FIG. 65 is a super filter made of a minute sintered body of alumina (AQzOa), stainless steel, etc., and this is the basic element of the Phan Ting Bon pump. Valve 66 is a valve provided to bypass super filter 65. Since the super filter 65 is made of a sintered body as described above, when normal liquid helium or cooled helium gas is passed through the pipes 67 and 68, a very large pressure loss occurs. It turns out. Therefore, in such a case, the water is passed through the bypass valve 66 instead of the super filter 65. FIG. 8 shows a super filter 65 and a bypass valve 66 integrated.

69 is a super filter, and 70 is a bypass valve. When it is necessary to flow a fluid other than superfluid helium, the drive rod 71 passes through bellows 72 and 73,
Open the valve 70 and widen the gap 74 so that the fluid 75 flows through the gap 74 instead of through the super filter Gin J9.

On the other hand, when the fluid 75 becomes superfluid helium, the bypass valve 70 is closed and the superfilter function is activated.

(Effects of the Invention) According to the present invention, the fountain pump is driven using the heat that enters the superfluid helium from the outside or the heat inevitably generated in the superfluid helium, and thereby the superfluid helium is heated. Since a circulating flow can be formed in helium, it has the effect of significantly increasing cooling efficiency.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a superfluid helium device including an embodiment of the present invention. 2 and 3 are vertical sectional views showing details of a part of FIG. 1. FIG. 4 is a longitudinal sectional view showing another embodiment of the present invention. FIG. 5 is a longitudinal sectional view showing a structure different from that in FIG. 4. FIGS. 6(a) and 6(b) are developed cross-sectional views showing embodiments of the superconducting helical coil of the present invention. Figures 7 and 8
The figures are longitudinal sectional views showing embodiments of the fountain pump of the present invention. 3...Liquid helium, 7...Superfluid helium, 8.
...Substance to be cooled, 11...Cooling channel, 12...
・Fan f4 Figure 54 Fan fan 5 Figure 55 Heat exchanger 56 F) Te) Ho0 shift 0

Claims (1)

[Scope of Claims] 1. A superfluid helium device that cools a substance to be cooled by immersing it in superfluid helium, comprising a Fantin pump that operates as a driving heat source and the heat that enters the superfluid helium, A superfluid helium device characterized by generating a flow in fluid helium. 2. The superfluid helium device according to claim 1, wherein heat penetrating into the superfluid helium via a load support or an electric conductor is used as the driving heat source. 3. The superfluid helium device according to claim 1, wherein heat generated by a substance to be cooled in superfluid helium is used as the driving heat source. 4. The superfluid helium device according to claim 1, wherein spontaneous heat generation of an accessory device other than the substance to be cooled in superfluid helium is used as the driving heat source. 5. A patent for cooling an object immersed in superfluid helium by providing one or more cooling channels with a circulating flow of superfluid helium formed by a fountain pump. A superfluid helium device according to claim 1. 6. In a material to be cooled having a plurality of cooling channels, these cooling channels are divided into a plurality of units, and a superfluid helium circulation loop is formed for each unit by a Fantine pump. Superfluid helium device. 7. When the object to be cooled immersed in superfluid helium is a superconducting helical coil, the superconducting helical coil is divided into a plurality of parts for each period or 1/2 period, and each part forms one cooling channel loop. 6. The superfluid helium device according to claim 5, wherein a circulating flow of superfluid helium is formed by a fantine pump. 8. The superfluid helium device according to claim 1, wherein a bypass valve is provided in parallel with the Fantine pump.