Device and method for installing and fixing profound hypothermia gaseous helium cold screen temperature sensor

Abstract

The invention discloses a device for installing and fixing a profound hypothermia gaseous helium cold screen temperature sensor. The device comprises a gaseous helium cold screen, an installing support and a compressing device, wherein the compressing device comprises a compressing bolt, a fixed nut, a spring washer, a check nut, a heat insulation cushion, a temperature sensor, a filler, a heat conduction cushion block and the like; the installing support is installed on the outer side of the gaseous helium cold screen; the compressing device is installed on the installing support, and the endabuts against the gaseous helium cold screen; the heat conduction cushion block is installed on the gaseous helium cold screen; the fixed nut is welded onto the installing support; the compressing bolt is installed on the installing support through the fixed nut; the spring washer and the check nut are positioned below the installing support and are installed on the compressing bolt; the end of the compressing bolt abuts against the heat insulation cushion; the temperature sensor is installed between the heat insulation cushion and the heat conduction cushion block; and the filler is installed between the temperature sensor and the heat conduction cushion block. The device is applicable for the installation of various profound hypothermia temperature sensors, and meets the temperature measurement requirement of the gaseous helium cold screen in different stages.

Description

technical field [0001] The invention relates to the field of deep low temperature, in particular to a device and method for installing and fixing a temperature sensor of a deep low temperature gas-helium cold shield. Background technique [0002] Part of the optical load of the spacecraft needs to be subjected to a deep low temperature vacuum calibration test. As a deep low temperature target source, the gas helium cold shield needs to maintain a deep low temperature environment below 20K. It is extremely difficult to accurately measure the temperature in this deep low temperature environment. At present, there are two main methods: one is to paste the temperature sensor on the surface of the temperature measurement with low-temperature glue, but the phenomenon that the temperature sensor often falls off or is partially detached in a deep and low temperature environment, resulting in the inability to measure accurately; Threaded holes are drilled on the temperature measureme...

AI Technical Summary

Problems solved by technology

[0002] Part of the optical load of the spacecraft needs to be subjected to a deep low temperature vacuum calibration test. As a deep low temperature target source, the gas helium cold shield needs to maintain a deep low temperature environment below 20K. It is extremely difficult to accurately measure the temperature in this deep low temperature environment.

At present, there are two main methods: one is to paste the temperature sensor on the surface of the temperature measurement with low-temperature glue, but the phenomenon that the temperature sensor often falls off or is partially detached in a deep and low temperature environment, resulting in the inability to measure accurately; Threaded holes are drilled on the temperature measurement surface, and the sensor is pressed against the temperature measurement surface with bolts. However, this method will produce a certain amount of cold shrinkage as the temperature drops, causing the contact surface to be partially detached, affecting the temperature measurement accuracy, and the temperature measurement surface needs to be opened. There are certain requirements for the thickness of the temperature measuring surface, which needs to be considered in the design of the gas-helium cold screen. It is not suitable for the installation and modification of the temperature sensor of the existing gas-helium cold screen.

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