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Low-temperature surface type heat exchanger adopting bypass throttling and precooling J-T refrigerator

A bypass throttling and heat exchanger technology, applied in the low temperature field, can solve the problems that the high-pressure side gas cannot be fully cooled, affecting the performance improvement of the refrigerator, etc., and achieve the effects of reducing the temperature, improving the temperature field distribution, and reducing the quality.

Active Publication Date: 2015-09-02
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Enlarging the heat exchange area can increase the amount of heat exchange and improve the efficiency of the heat exchanger, but the final heat exchanger works below the liquid hydrogen temperature range, the non-ideality of helium is significant, and the specific heat capacity of the gas at the high pressure side of the heat exchanger is greater than that at the low pressure side (like Figure 5 As shown), the gas on the high-pressure side cannot be cooled sufficiently, which affects the further improvement of the performance of the refrigerator

Method used

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  • Low-temperature surface type heat exchanger adopting bypass throttling and precooling J-T refrigerator
  • Low-temperature surface type heat exchanger adopting bypass throttling and precooling J-T refrigerator
  • Low-temperature surface type heat exchanger adopting bypass throttling and precooling J-T refrigerator

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Such as figure 1 As shown, a precooling type liquid helium temperature zone J-T refrigerator adopting a low-temperature partition wall heat exchanger with bypass throttling is composed of a precooling stage refrigerator PC and a J-T stage refrigerator J-TC. In this embodiment The middle pre-cooling stage refrigerator selects the Stirling refrigerator. J-T level refrigerator J-TC includes J-T compressor C, first-stage partition heat exchanger HX1, second-stage partition heat exchanger HX2, final-stage partition heat exchanger HXL, first-stage pre-cooling heat exchanger PHX1, second-stage pre-cooling heat exchanger PHX2, liquid helium temperature zone evaporator LHC, main J-T throttle valve MO, bypass J-T throttle valve BO and bypass valve BV, of which the final stage partition wall heat exchanger HXL adopts Low temperature partition wall heat exchanger with bypass throttling. The first-stage pre-cooling heat exchanger PHX1 of the J-T-stage refrigerator J-TC, the secon...

Embodiment 2

[0045] Such as figure 2As shown, a pre-cooling type liquid helium temperature zone J-T refrigerator adopting a low-temperature partition wall heat exchanger with bypass throttling is composed of a pre-cooling stage refrigerator PC and a J-T stage refrigerator J-TC. The difference from Embodiment 1 is that there are two bypass throttle valves in the final partition wall heat exchanger HXL: the first bypass J-T throttle valve BO1 and the second bypass J-T throttle valve BO2. After the high-pressure gas enters the final stage partitioning wall heat exchanger HXL, it is divided into two paths at the inlet of the first bypass J-T throttle valve BO1 (15 points), and one path continues on the high pressure side of the final stage partitioning wall heat exchanger HXL The other way is throttled and cooled in the first bypass J-T throttle valve BO1 and then enters the low pressure side (16 o’clock) to merge with the return gas. The high-pressure gas is divided into two paths at the in...

Embodiment 3

[0048] Such as image 3 As shown, a pre-cooling type liquid helium temperature zone J-T refrigerator adopting a low-temperature partition wall heat exchanger with bypass throttling is composed of a pre-cooling stage refrigerator PC and a J-T stage refrigerator J-TC. The difference from Example 1 is that a single-stage pre-cooling refrigerator is adopted, and the high-pressure gas at the outlet of the first-stage pre-cooling heat exchanger PHX1 enters the final-stage partitioning wall heat exchanger HXL (point 3-6), and is discharged in the bypass The BO inlet of the J-T throttle valve (7 o’clock) is divided into two paths, and one path continues to be cooled in the final stage partition wall heat exchanger HXL (7 o’clock-8 o’clock), throttling refrigeration (8 o’clock-9 o’clock) and The evaporator LHC (9:00-10:00) provides cooling capacity; the other way bypasses throttling to cool down and enters the low-pressure side (7:00-11:00 o'clock) and merges with the gas returning fro...

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Abstract

The invention discloses a low-temperature surface type heat exchanger adopting bypass throttling. The low-temperature surface type heat exchanger comprises a high-pressure side pipeline and a low-pressure side pipeline. The low-temperature surface type heat exchanger is operated in a liquid hydrogen temperature region or a lower temperature region. At least one bypass pipeline communicated with the low-pressure side pipeline is arranged on the high-pressure side pipeline, and an isenthalpic throttling element is arranged on each bypass pipeline. The temperature of a working medium in the low-pressure side pipeline at the outlet of each bypass pipeline is lower than the temperature of a working medium in the high-pressure side pipeline at the inlet each bypass pipeline. The invention further provides a precooling J-T refrigerator. Temperature field distribution of gas in the heat exchanger is changed by adopting bypass throttling, and irreversible loss is reduced. The heat exchanger is applied to the liquid helium temperature region precooling J-T refrigerator, temperature of high-pressure gas before throttling is lowered, refrigerating capacity of the liquid hydrogen temperature region is increased, and overall efficiency is increased.

Description

technical field [0001] The invention relates to low temperature technology, in particular to a liquid helium temperature zone wall heat exchanger and a precooling low temperature J-T refrigerator adopting bypass throttling. Background technique [0002] Space exploration refers to the technology of discovering and exploring celestial structures and outer space, realized through various forms of space telescopes or detectors. Compared with detectors at normal temperature, detectors working at low temperatures can achieve higher observation accuracy and capture weaker signals. Among them, a large number of infrared detectors need to work in the liquid helium temperature region (2-10K), requiring Stable and reliable low temperature environment. [0003] The cooling methods in the space liquid helium temperature zone mainly include superfluid helium Dewar and mechanical refrigerator. The mechanical refrigerator is an active refrigeration device based on a closed refrigeration ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25B41/06F25B25/00F25B41/37
CPCF25B25/00F25B39/00F25B41/30F25B9/02
Inventor 陶轩甘智华刘东立邓皓仁尹成厚韩东阳
Owner ZHEJIANG UNIV
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