JPS6016872Y2 - refrigerant gas cooler - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improved structure of a refrigerant gas cooler that is a component of a cryogenic device such as a helium refrigerator.

Figure 1 is a schematic diagram showing a superconducting magnet device. 1 is a superconducting coil, 2 is a liquid helium tank that houses the superconducting coil 1 and stores liquid helium, and 3 is a heat shield plate for the liquid helium tank. 31 is an upper shield plate, and 32 is a lower shield plate.

4 is the upper shield cooling pipe, 5 is the lower shield cooling pipe, 6
61 is a helium refrigerator, part of which is a compressor, and 6 is a helium refrigerator.
2 is a heat exchanger, 63 is a high pressure helium gas line, and 64 is a low pressure helium gas line.

7 is a pre-cooling refrigerator, such as a Gifford-McMahon cycle refrigerator; 8 is a refrigerant gas cooler provided in contact with the low-temperature end of the pre-cooling refrigerator 7; and 9 is a heat insulator that houses the low-temperature parts of the above components. It is a vacuum container.

FIG. 2 is a partial cross-sectional view showing the structure of a conventional refrigerant gas cooler, in which 10 is a cylindrical heat transfer member that extracts cold from the low temperature end of the precooling refrigerator, 11 is a first pipe line, and lla is a An inner tube provided so as to come into contact with the outer shape of the heat transfer member 10, llb
11C is a first helical fin installed in a spiral manner on the outer periphery of the inner tube 11a, 11C is a first outer tube provided so as to come into contact with the outer periphery of the first helical fin Ilb, and 11d and lie are:
A first airtight flange seals both ends between the inner tube 11a and the first outer tube 11c, 12 is a second conduit, and 12a is a first spiral fin Ilb on the outer periphery of the first outer tube 11c. A second spiral fin 12b is similarly planted, and a second outer tube is provided so as to come into contact with the outer periphery of the second spiral fin 12a.
12c and 12d are second airtight flanges at both ends between the first outer tube 11c and the second outer tube 12b, similar to the first airtight flanges lid and lle.

13 is a third pipe line having the same configuration as the first and second pipe lines 11 and 12, 13a is a third spiral fin, 13b is a third outer pipe, and 13C and 13d are third airtight flanges.

Airtight flange 11dy 11 e-12c, 12d*
13c and 13d each have an inlet and an outlet for refrigerant gas.

Next, this operation will be explained.

Normally, the liquid helium tank 2 is adiabatically housed in a vacuum container 9, and the outer periphery of the liquid helium tank 2 is provided with a heat shield plate 3.
is provided and kept cooled at an appropriate temperature to reduce the inflow of radiant heat from the walls of the vacuum vessel 9.

FIG. 1 shows an example of a case where high pressure helium gas 63 from a helium refrigerator 6 is circulated through the heat shield plate 3 for cooling.

When the flow rate of the high-pressure helium gas 63 is small relative to the refrigeration load of the heat shield plate 3, cooling with a single channel of the single-ended cooling pipe will cause the outlet gas temperature of the cooled part to become considerably high, raising the average temperature of the shield. In such a case, it is useful to divide the refrigeration load and cool it through a refrigerant gas cooler 8 equipped with a plurality of pipes as a cooling means.

That is, the high-pressure Rivum gas 63 discharged from the compressor 61 of the helium refrigerator section 6 is taken out from an appropriate temperature level of the heat exchanger 62 through piping, and then transferred to the low temperature end (cold source) of the pre-cooling refrigerator 7.
First, high-pressure helium gas 63 cooled to about 70K is guided to the upper heat shield cooling pipe 4 through the first pipe 11 of the refrigerant pull cooler 8, which is provided with a plurality of pipes in contact with the Upper heat shield 31: is cooled.

The high-pressure thermal helium gas that returns after taking away the heat from the shield is cooled again to a predetermined temperature through the second pipe line 12 of the refrigerant gas cooler 8, guided to the lower heat shield cooling pipe 5, and then similarly heated. Cool the lower heat shield 32.

Furthermore, high pressure helium gas 6 returning from the second shield
3 to the heat exchanger 6 via the third pipe line 13 of the refrigerant gas cooler 8.
Return to 2.

If the temperature of the high-pressure helium gas 63 supplied to each heat shield 31 and 32 via the refrigerant gas cooler 8 is equal, and the refrigeration load of the heat shield plate 3 is divided into two, the inlet and outlet gas of the shield The temperature difference is half that of cooling with one pipe, allowing more rational cooling.

As shown in FIG. 2, this refrigerant gas cooler has an inner pipe 1
1a, the first outer tube 11d1, the second outer tube 12c1, and the third outer tube 13c are arranged in the same way, and the first spiral fin 11c1, the second spiral fin 12b1, and the third spiral fin are arranged between each tube. 13b were mounted in contact with each other to form a plurality of conduits.

The high-pressure helium gas 63 flowing through the first pipe is supplied to the pre-cooling refrigerator 7
Heat exchange is performed between the low-temperature end and the heat transfer member 10, the wall of the first inner pipe 11a, and the first spiral fin 11b, and the pipe is cooled to a predetermined temperature.

The high-pressure helium gas 63 flowing through the second pipe line 12 undergoes heat exchange from the first spiral fin Ilb through the first outer pipe 11c and the second spiral fin 12a, and the high-pressure helium gas 63 flowing through the third pipe line 13 undergoes heat exchange. The helium gas 63 is further supplied in the same manner through the second outer tube 12b and the third spiral fin 13a.

However, in the refrigerant gas cooler 8 configured as described above, when high-pressure helium gas 63 is caused to flow through each pipe, heat transfer resistance between the heat transfer member 10 and the mutual walls of each pipe leads to There was a drawback that the cooling temperature of the high pressure helium gas in the pipes became high, and the high pressure helium gas 63 in each of the plurality of pipes could not be similarly cooled to the lowest temperature.

This idea was made in order to eliminate the drawbacks of the conventional ones as mentioned above.A spiral tube with a heat transfer path perpendicular to the cylindrical axis of the heat transfer member is placed on the heat transfer member at a constant interval. By providing and fixing on the parallel heat transfer fins,
It is an object of the present invention to provide a refrigerant gas cooler that can uniformly cool high-pressure helium gas flowing through each pipe.

An embodiment of this invention will be described below with reference to the drawings.

In FIG. 3, 10 is a heat transfer member having the same shape as the conventional one, and 14a, 14b and 14c are the heat transfer members 1.
The first, second and third heat transfer fins 15, which are closely attached to the outer periphery of the heat transfer fin 14a and spaced apart from each other, are arranged in a spiral shape by contacting the side heat transfer surface of the first heat transfer fin 14a. The first spiral tubes 16 and 17 constituting the first conduit 11 are metallurgically joined by winding and soldering or the like, and the first spiral tubes 15 are connected to the second heat transfer fin 14b and the third heat transfer fin 14c. The second spiral tube and the third spiral tube are respectively joined in the same manner as in FIG.

In the refrigerant gas cooler 8 configured in this way, when high-pressure helium gas 63 is caused to flow inward from the outside of the spiral tube through each of the plurality of pipes, the high-pressure helium gas 63 in each pipe is as follows.
Heat is exchanged with the low-temperature end (cold heat source) of the precooling refrigerator 7 through the spiral tube wall, heat transfer fins, and heat transfer member, and the temperature is cooled to the same temperature S at the outlet of the cooler.

FIG. 4 shows another embodiment of this invention, in which spiral tubes are provided on both heating surfaces of the heat transfer fins, allowing for a compact configuration in the case of multiple channels.

Figure 5 shows another embodiment of this invention, in which the heat transfer member is separated into each pipe unit and laminated to form a multi-channel unit, which makes the work easier. Moreover, the connecting direction of each pipe can be arbitrarily selected.

Although the above embodiment has been described using the precooling refrigerator 7 as a cold source, it is of course applicable to a wide range of cryostats that use a refrigerant such as liquid nitrogen or liquid oxygen as a cold source.

As described above, according to this invention, a plurality of spiral tubes having heat transfer paths orthogonal to the heat transfer member are arranged in parallel, and a fluid such as a refrigerant is circulated from the outside to the inside of the spiral tubes. As a result, each spiral tube inevitably forms a heat transfer path with the same temperature conditions for a single cold source, and the refrigerant gas in each spiral tube is cooled to a uniform temperature. Not only does it have an excellent effect, but by circulating the refrigerant gas from the outside to the inside of each volute tube, heat exchange between the cold heat source and the refrigerant gas in each vortex tube can be carried out from the opposite side. This is now possible through a fluid heat transfer path, and the cold contained in the cold heat source can be extracted to the refrigerant side as effectively as possible and used effectively, making it an excellent technology that significantly contributes to improved performance. It has practical effects.

[Brief explanation of the drawing]

Fig. 1 is a route map showing an example of a superconducting magnet device, Fig. 2 is a conventional refrigerant gas cooler, A is a cutaway front view of the bulge, the mouth is a plan view, and Fig. 3 is an example of this invention. Embodiment A is a partially cutaway front view, FIG. 4 is a plan view, and FIGS. 4 and 5 are partially cutaway front views showing other embodiments of this invention. In the figure, 10 is a heat transfer member, 14a, 14b, and 14C are first, second, and third heat transfer fins, respectively.
are the first, second, and third spiral tubes, respectively. Note that the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (3)

[Scope of utility model registration request] (1) A cylindrical heat transfer member cooled to a constant temperature, a plurality of flat heat transfer fins vertically planted on the outer surface of the heat transfer member at certain intervals, and each of the heat transfer fins. A spiral tube metallurgically fixed on at least one side of the heat transfer surface of the heat fin, and a plurality of conduits having heat transfer paths perpendicular to the heat transfer member are arranged in parallel, and the outer side of the spiral tube is arranged in parallel. A refrigerant gas cooler characterized in that fluid is caused to flow inward from the inside. (2) Utility model registration claim No. 1 characterized in that spiral tubes are fixed on both heat transfer surfaces of the heat transfer fin, respectively.
Refrigerant gas cooler described in ). (3) Utility model registration claim 1 or 2, characterized in that the heat transfer member is separated into each conduit unit and laminated to form a multi-flow path. Refrigerant gas cooler.