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A columnar built-in cryopump

A built-in, cryogenic pump technology, applied in the direction of variable capacity pump components, pumps, pump components, etc., can solve problems such as poor applicability, achieve simple structure, improve the ability to block heat radiation, and high pumping capacity. Effect

Active Publication Date: 2021-10-26
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem of poor applicability of the existing cryopump, and provides a columnar built-in cryopump for the special environment of the tokamak device, which is used for evacuating the vacuum chamber of the tokamak device and as a fuel internal circulation important step in

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The invention provides a columnar built-in low temperature pump, which is used for evacuating the vacuum chamber of a tokamak device and as an important step in the internal circulation of fuel. Such as Figure 1-5 As shown, the structure of the present invention includes a joint plate, a pump casing 10, an annular 80K outer baffle 11, a liquid helium pipeline 15, several 4.6K cryogenic baffles 13 and an 80K inner baffle 12.

[0032] The joint plate is arranged on the pump casing 10, on which there is an air inlet 7, a liquid helium inlet 1, and a liquid helium outlet 9, which are used to pass gas to be treated and liquid helium into the pump casing. The annular 80K outer baffle 11 is arranged inside the pump casing 10 for shielding heat radiation from the outside of the pump casing, and an insulating layer can be provided outside the pump casing 10 as required. And the ring-shaped 80K outer baffle 11 is provided with a bracket, and all the 80K inner baffles are evenly...

Embodiment 2

[0038] The difference from Example 1 is that this example uses a sandwich-type herringbone baffle to replace the liquid nitrogen cooling pipe. One end of the sandwich-type herringbone baffle is connected to the liquid nitrogen inlet, and the other end is connected to the liquid nitrogen outlet. It is used for liquid nitrogen Flow in the interlayer to cool the annular 80K outer baffle.

[0039] The actual test process data of the present invention are provided below according to the designs of the above-mentioned embodiments 1 and 2.

[0040] Use a flowmeter to adjust the flow rate, when the pump body enters 5.0×10 -3 Pa~5.0×10 -1 In the range of Pa, record the vacuum degree and instantaneous flow rate. The pumping speed formula is S=Q / P, take the value multiple times, give the pumping speed curve, and take the maximum pumping speed value.

[0041] The instantaneous flow rate of nitrogen gas is 100SCCM, and the instantaneous flow rate can be increased according to the actual...

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Abstract

The invention discloses a cylindrical built-in cryogenic pump, comprising a joint plate, a pump casing, an annular 80K outer baffle, a liquid helium pipeline, and several 4.6K low temperature baffles and an 80K inner baffle; the joint plate is arranged on the pump casing, and the There is an air inlet, a liquid helium inlet and a liquid helium outlet; the annular 80K outer baffle is arranged in the pump casing; the annular 80K outer baffle is provided with a bracket, and all the 80K inner baffles are arranged side by side on both sides of the bracket , and each 80K inner baffle is a herringbone structure; there is a ring connecting plate between the 80K inner baffle and the annular 80K outer baffle, the 4.6K low temperature baffle is concave, and the inner wall is coated with activated carbon ; All 4.6K cryogenic baffles form a group of mirror images and are evenly distributed on the annular connecting plate; the liquid helium pipeline passes through the gap between adjacent 4.6K cryogenic baffles in turn, and one end of the liquid helium pipeline is connected to liquid helium Inlet, and the other end is connected to the liquid helium outlet. The invention well realizes the condensation of the easy gas in the gas to be treated and the adsorption of the gas (hydrogen, helium) at the difficult condensation point.

Description

technical field [0001] The invention relates to the field of thermonuclear fusion, in particular to a columnar built-in cryopump. Background technique [0002] Tokamak devices are one of the most effective ways to study nuclear fusion. In the tokamak device, it is necessary to ensure that the helium ash after the reaction needs to be quickly pumped away, and the existing tokamak device is usually equipped with pumping after the divertor. The suction port of the vacuum pump of the divertor is generally located under the target plate of the divertor. During the discharge process, a strong plasma, ion current and electron current flow to the target plate. These particles interact with the target plate to form neutral particles, and some neutral particles Flowing to the divertor chamber, at the same time, some neutral particles and electrons may be ionized again after the interaction between the ions. After the interaction between the particles and electrons, they may also coin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B37/08F04B39/06
CPCF04B37/08F04B39/06
Inventor 邓立陈长安黄国强高博殷雪峰姚勇王劲川胡俊刘林子陈俊光陈克琳陈军罗军洪
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS