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Ultra-silent liquid helium thermostat

A thermostat and static liquid technology, applied in the field of liquid helium thermostats and ultra-static liquid helium thermostats for scientific research, can solve problems such as large vibrations, achieve low liquid helium loss, and avoid low reliability effects

Inactive Publication Date: 2009-07-22
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the defect of large vibration in the existing liquid helium thermostat for scientific research, a liquid helium thermostat with ultra-low vibration is manufactured

Method used

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  • Ultra-silent liquid helium thermostat

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1: Basic Ultrastatic Liquid Helium Thermostat

[0028] see figure 1 , the basic ultrastatic liquid helium thermostat of the present invention includes a shell 1, an inner tank 2, a bottleneck 3, a helium outlet pipe 5 and a cold screen 6, and is characterized in that it also includes a pumping and charging tube 4, and the inner tank 2 is placed inside the outer shell 1 One end of the bottleneck 3 extends from the top of the inner tank 2 to the bottom of the inner tank 2 and is sealed with the bottom of the inner tank 2 , the other end communicates with the outside of the outer shell 1 from the top of the outer shell 1 , and the pumping and filling tube 4 communicates with the inside of the bottleneck 3 Outside the shell 1, the cold screen 6 is placed between the inner tank 2 and the outer shell 1 and covers the inner tank 2, the helium outlet pipe 5 is coiled on the cold screen 6, and its two ends are connected to the inside of the inner tank 2 and the outer she...

Embodiment 2

[0032] Embodiment 2: the ultrastatic liquid helium thermostat of double-coil cold vapor refrigeration

[0033] In the above-mentioned embodiment 1, in order to simultaneously take into account radiation heat leakage and solid conduction heat leakage from the bottleneck 3, an auxiliary helium outlet pipe 7 coiled on the bottleneck 3 and connected to the inner tank 2 and the outer shell 1 at both ends is added. , can reduce the temperature of the bottleneck 3 to a large extent, thereby reducing the solid conduction heat leakage from room temperature to liquid helium to a large extent, see figure 2 . A gas flow rate control valve can also be added at the port outside the shell of the helium outlet pipe 5 and / or the auxiliary helium outlet pipe 7 to control the relative flow rate of the cold vapor in the helium outlet pipe 5 and the auxiliary helium outlet pipe 7, thereby obtaining an optimal The cold vapor flow rate ratio achieves lower loss of liquid helium, thereby minimizing...

Embodiment 3

[0034] Embodiment 3: the bottleneck is the superstatic liquid helium thermostat of the double-coil cold vapor refrigeration of bellows

[0035] In the above-mentioned embodiments 1 and 2, in order to further reduce the solid conduction heat leakage from the outer shell 1 to the inner liner 2 through the bottleneck 3, the bottleneck 3 from the inner liner 2 to the outer shell 1 can use a thicker wall. Thinner, longer effective length of heat transfer bellows instead, see image 3 .

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Abstract

The invention discloses an extra-static liquid helium thermostat and relates to a liquid helium thermostat. The thermostat comprises a shell, an inner container, a bottle neck, a gas exhaust and inflation pipe, a helium outlet pipe and a cold shield, wherein, the inner container is arranged inside the shell; one end of the bottle neck extends to the bottom of the inner container from the top of the inner container and is sealed and connected with the bottom of the inner container; the other end of the bottle neck is communicated with the outer part of the shell by the top of the shell; the inside of the bottle neck is communicated with the outer part of the shell by the gas exhaust and inflation pipe; the cold shield is arranged between the inner container and the shell and covers the inner container; the helium outlet pipe is wound around the cold shield; the two ends of the helium outlet pipe communicate the inside of the inner container with the outside of the shell; vacuum is formed between the outside of the inner container and the inner surface of the shell; an auxiliary helium outlet pipe can be added and wound on the bottle neck; the two ends of the auxiliary helium outlet pipe can communicate the inside of the inner container with the outside of the shell; and the bottle neck can be made of a corrugated pipe. The bottle neck extends to the bottom from the top of the inner container and is sealed and connected with the bottom, so as to obtain a lower temperature cavity body separated from the liquid helium, and avoid the shock caused by the collision of the boiling of the liquid helium with the experimental facilities in the bottle neck. Two helium outlet pipes are utilized to cool the cold shield and the bottle neck, so as to reduce helium evaporativity.

Description

technical field [0001] The invention relates to a liquid helium thermostat, in particular to an ultra-static liquid helium thermostat for scientific research with ultra-low vibration, and belongs to the technical field of cryostats. Background technique [0002] The liquid helium thermostat for scientific research is a low-temperature container that can provide a low-temperature cold environment for the experimental device and shield the influence of external temperature, air and water vapor on the experiment. It has been widely used in thermophysical properties, material mechanical properties, Research and testing fields such as magnetic mechanical properties, material superconducting properties, optical physical properties and biomedicine development. [0003] The existing liquid helium thermostats for scientific research have the following disadvantages: (1) The experimental device is directly immersed in the liquid helium in the inner tank when used, and the boiling of t...

Claims

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Application Information

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IPC IPC(8): F25D3/10
Inventor 庞宗强陆轻铀
Owner UNIV OF SCI & TECH OF CHINA
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