High-pressure, large-flow, low-temperature liquid nitrogen/helium heat exchange device

Abstract

A high-pressure, large-flow, low-temperature, liquid nitrogen / helium heat exchange device. The invention relates to a liquid nitrogen / helium heat exchange device, which comprises a casing and a core placed in the casing. The heat exchanger core is installed in the heat exchanger casing, and the casing is filled with liquid nitrogen. Helium enters the core of the heat exchanger from the two helium inlet pipes in two routes, then enters the gas collection chamber welded on the tube sheet, and then passes through the heat exchange tubes at the rear of the upper part in turn, and connects to the heat exchanger at the front of the upper part. After the heat pipe, the heat exchange tube in the front of the lower half of the connecting pipe, the connecting pipe, and the heat exchange tube in the rear of the lower half, lead out from the helium outlet pipe respectively. The heat exchange tubes are welded between the tube sheets on both sides and supported by the supporting plates. The invention adopts the secondary cooling technology, which can obtain larger temperature drop and lower outlet temperature than the existing low-temperature heat exchanger. The structure design of the gas collection chamber breaks through the shortcoming of low pressure of the existing heat exchanger, and the design technology of the combination of expansion and welding breaks through the problem of easy leakage of helium under high pressure.

Description

technical field [0001] The invention relates to a low-temperature heat exchange device applicable to a new-generation launch vehicle pressurized delivery test system, in particular to a high-pressure, large-flow, low-temperature, liquid nitrogen / helium heat exchange device. Background technique [0002] The existing low-temperature helium heat exchanger has a narrow temperature drop range and high low temperature value, low working pressure and small flow rate, which cannot meet the requirements of large temperature drop of helium under high pressure and large flow rate. Contents of the invention [0003] In order to solve the deficiencies of existing cryogenic heat exchangers such as low pressure, small and non-adjustable flow rate, small temperature drop and high temperature value, the present invention provides a high-pressure, large-flow, low-temperature, high-efficiency liquid nitrogen / helium gas exchanger heat device. [0004] Technical solution of the present inven...

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Problems solved by technology

[0003] In order to solve the deficiencies of existing cryogenic heat exchangers such as low pressure, small and non-adjustable flow rate, small temperature drop and high temperature value, the present invention provides a high-pressure, large-flow, low-temperature, high-efficiency liquid nitrogen / helium gas exchanger thermal device

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