JPH024176A - Refrigerating device - Google Patents

Abstract

PURPOSE:To reduce a total installation area even when a plurality of low- temperature tanks is provided continuously for one set of refrigerating machine by a method wherein the low-temperature tank is provided with a cooling unit on a heat insulating wall and a heat exchanging fin therein while the low- temperature tank is connected to the refrigerating machine by a communicating pipe interposing a solenoid valve. CONSTITUTION:Low-temperature tanks 30a, 30b, 30c are provided with cooling units 31 instead of a blow-off pipe and a suction pipe on the heat insulating wall of a heat insulating box 15 while a circulating fan 33 for circulating gas in the heat insulating box 15 is provided. Heat exchanging fins 32, provided in a low-temperature chamber 15 so as to be connected to the cooling units 31 respectively, are cooled by effecting Stirling cycle. In this case, when opening and closing valves 36a, 36b, 36c, provided in respective branch pipes 35a, 35b, 35c, are opened, air in the low-temperature tanks 30a, 30b, 30c may be circulated by the circulating fans 33.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a refrigeration system in which a Stirling cycle refrigerator is connected to a low temperature chamber.

[Conventional technology]

Figure 2 shows, for example, ``The Gas Refrigerating
``Machine and It's Position in Cryogenic Techniques'' ``Blockless in Cryogenic Techniques'' Author: F. Davru El Queira Heywood and Company Limited London Published in 1960 (THE GAS REFR
IGERA↑ING MACHINE AND
ITSPO8ITION IN CRYOGENI
CTECHNIQUE PROGRESS INC.
RYOGENIC8FIG14 HEYWO○o&c
OMpANY Ltd., LONDON 1960) is a sectional view showing a conventional refrigeration system, in which 1 is a Stirling cycle refrigerator, 2 is an air cooling header integrally provided with this Stirling cycle refrigerator 1, and 3 is an air cooling header integrally provided with this Stirling cycle refrigerator 1. This is a low temperature tank connected to this air cooling header 2.

Thus, the Stirling cycle refrigerator 1 is composed of an electric motor 4 and a compressor 5.

Moreover, the air-cooled soda 2 includes a cooling section 6 provided at the outlet of the compressor 5, and cooling fins 7 attached to this cooling section 6.
, a fan casing 8 that is connected to the cooling section 6 in an airtight manner, a sirocco fan 9 provided within the fan casing 8, a fan motor 10 that drives the sirocco fan 9, and a fan casing 8 that is connected to the cooling section 6 in an airtight manner. and an external case 12 that surrounds the fan casing 8 via a heat insulating material 11. The sirocco fan 9 is connected to a fan motor 10 via a coupling 13.

Furthermore, the cryostat 3 is composed of an insulating box 15 in which a frozen object 14 such as a superconducting material is housed, and an inner lid 16 and an outer lid 17 that double cover this insulating box 15.
A suction pipe 18 that guides air to the cooling section 6 of the air cooling header 2 and an outlet pipe 19 that blows out cold air from the fan casing 8 of the air header 2 are connected to each of the air cooling headers 5 .

In the figure, 20 is a temperature measuring device that detects the temperature inside the insulation box 15, 21 is a controller that controls the temperature inside the insulation box 15 to a predetermined value, and 22 is a gasket.

Next, the operation will be explained. Object 1 to be frozen in insulation box 15
The case of freezing 4 will be described. The low temperature chamber 3 includes an air cooling header 2, a blowout pipe 19, and a suction pipe 18 to form a closed circuit duct.

First, by operating the Stirling cycle refrigerator 1,
The cooling fins 7 of the cooling unit 6 will be cooled. Therefore, by operating the fan motor 10, the sirocco fan 9 is rotated, and the air in the low temperature chamber 3 is sucked in through the suction pipe 18, and blown out through the blowout pipe 19 to be circulated. For this reason,
Air will pass through the cooling fins 7 of the cooling unit 6,
During this passage, heat exchange takes place and the air is cooled to obtain cold air. The sensible heat of this cooled cold air cools the frozen object 14 inside the insulation box 15 and keeps it at a low temperature. Further, the temperature inside the heat insulating box 15 is detected by a temperature measuring device 20, and the pressure of the gas sealed in the compressor 5 or the rotational speed of the electric motor 4 is varied by a controller 21 to control the temperature to a predetermined value.

[Problem to be solved by the invention]

Since the conventional refrigeration system is configured as described above, at least one cryostat 3 requires one Stirling cycle refrigerator 1 that is integrally equipped with an air cooling header 2, and this air cooling header 2 is used for cooling. Insulating material 11 to insulate section 6
layer becomes thicker, which increases the structural dimensions of the air-cooled ladder 2.

For this reason, the structural dimensions of the cryostat become large, and when a plurality of cryostats are installed, a large installation area is required, resulting in an increase in cost.

This invention was made to solve the above problems, and even if multiple cryostats are connected to one refrigerator, the overall installation area can be reduced and cost increases can be suppressed. The purpose of the present invention is to obtain a refrigeration device that does the following.

[Means to solve the problem]

The refrigeration system according to the present invention includes a cooling section provided in the heat insulating wall of the cryostat, heat exchange fins inside the cryostat, and a communication pipe connecting the cryostat and the refrigerator with an electromagnetic valve interposed therebetween. It is something.

[Effect]

In the refrigeration system according to the present invention, the refrigeration machine and the cooling section can be separated by providing heat exchange fins in the low temperature chamber to cool the internal gas, so that one refrigeration machine and multiple low temperature Even if the tanks are installed in series, it can be made smaller and lighter, and the installation area can be reduced, and the temperature control of each cryostat,
Operation control becomes easier.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure is a longitudinal cross-sectional view showing one embodiment of the present invention, and in FIG. 1, the same or equivalent components as in FIG. 2 are given the same reference numerals, and redundant explanation will be omitted.

In Fig. 1, 30a, 30b, and 30c are low temperature chambers;
In addition to the same components as the conventional ones, the cryostats 30a, 30b, and 30c each have a cooling section 31 on the insulating wall of the insulating box 15 instead of the suction pipe and the outlet pipe, and a heat exchange fin 32 inside the insulating box 15. At the same time, a circulation fan 33 for circulating the gas inside the insulation box 15 is provided. Although not shown, each cooling section consists of an expansion space that is a low-temperature space, a compression space that is at room temperature, and a regenerator space that is a regenerative heat exchanger, and the working medium moves through these spaces by the movement of a piston called a displacer. It looks like this. Reference numeral 34 indicates a communication pipe that serves as a gas flow path connected to the compressor 5 of the Stirling cycle refrigerator 1, and reference numerals 35a, 35b, and 35c indicate cooling units 31 provided in this communication pipe 34 and each of the low temperature chambers 30a, 30b, and 30c. branch pipes, 36a, 36b, 36 connecting
Reference character c is an on-off valve, such as a solenoid valve or a manual valve, which is provided in the middle of the branch pipes 35a, 35b, and 35c, and shuts off communication between the compressor 5 and the cryogenic chambers 30a, 30b, and 30c.

Next, the operation will be explained. By performing the Stirling cycle, the heat exchange fins 32 provided in the cold room 15 and connected to each cooling section 31 are cooled. At this time, if the on-off valves 36 provided in each branch pipe 35 are all open, the air in the cryostat 3Qa, 3Qb, 30c will be circulated by the circulation fan 33. That is, this air is transferred to the cryostat 30 a * 30 b t 3
The frozen object 1 housed in the heat insulating box 15 undergoes heat exchange with the heat exchange fins 32 in the cold air, and is heated by the sensible heat of the cold air.
Freeze 4. Further, the temperature inside the heat insulating box 15 is detected by a temperature measuring device 21, and the pressure of the gas sealed in the compressor 5 or the rotation speed of the electric motor 4 is varied by a controller 22 to control the temperature to a predetermined value.

Next, a case will be described in which the operation of the plurality of cryogenic chambers 30a, 30b, and 30c is controlled. Here, the low temperature chambers 30a, 30b,
When stopping the operation of 30c or controlling the temperature, first close the on-off valves 36a, 36b, and 36C to prevent the sealed gas from flowing into the cooling unit 31 via the communication pipe 34 and branch pipes 35a, 35b, and 35c.

Then, since the Stirling cycle of the cooling unit 31 is not performed, cooling stops. In addition, on-off valves 36a, 36b
, 36c, the low temperature chambers 30a, 30
b, the temperature inside 30c can be controlled. In this way, the on-off valve 3
By opening/closing 6a, 36b, 36C or controlling the closing time, each cryostat 30a, 30b, 30c can be stopped, or each cryostat 30a, 30b, 3
The desired temperature level of 0c can be easily obtained.

Next, a case will be described in which the load on the Stirling cycle refrigerator 1 changes by closing any one of the on-off valves 36a, 36b, and 36c. For example, when the operation of the cryogenic chamber 30c is stopped, the on-off valve 36C is closed, so the flow path volume of the branch pipe 35c from the on-off valve 36c to the cooling section 31 and the volume inside the cooling section 31 decrease. become. This lightens the load on the compressor 5, so the pressure of the filled gas in the compressor 5 is detected so that the pressure of the filled gas in the compressor 5 does not increase or the rotational speed of the electric motor 4 that drives the compressor 5 does not increase. Load fluctuations are detected by a detector (not shown) that detects the rotational speed of the motor 4 or a detector (not shown) that detects the rotational speed of the electric motor 4, and capacity control is performed in response to the load fluctuations.

〔Effect of the invention〕

As described above, according to the present invention, a refrigerator connected to a cryostat is connected via a communication pipe having a solenoid valve, and heat exchange fins are provided in the cryostat to cool the gas inside the cryostat. Because of this configuration, even if the refrigerator and a plurality of cryostats are connected, the installation area is small, which has the effect of suppressing the overall cost increase and obtaining a compact and lightweight product.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a refrigeration system according to an embodiment of the present invention, and FIG. 2 is a vertical sectional view showing a conventional refrigeration system. 1 is a Stirling cycle refrigerator, 5 is a compressor, 30a
, 30b, 30c are low temperature chambers, 34 is a communication pipe, 32 is a heat exchange fin, 33 is a circulation fan, and 36a. 36b and 36c are on-off valves. Patent applicant Mitsubishi Electric Corporation

Claims (1)

[Claims] By providing a refrigerator having a compressor and a cryostat connected to the compressor via a cooling section, and returning the gas in the cryostat to the cryostat after passing through the cooling section, In the refrigeration apparatus for cooling the object to be frozen in the cryostat, the cryostat and the refrigerator are connected by a communication pipe with an on-off valve interposed in the middle, and the cooling unit is provided on the insulated wall of the cryostat. What is claimed is: 1. A refrigeration system comprising: a heat exchange fin provided inside the cryostat; and a circulation fan provided in the low temperature chamber to cause internal gas to pass through the heat exchange fin.