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Aerospace pure oxygen filter and its welding method

A welding method and filter technology, applied in chemical instruments and methods, filtration separation, welding equipment, etc., can solve the problems of poor high temperature corrosion resistance, easy deformation, easy oxidation of welds, etc., to improve welding performance and service performance. , The effect of high surface quality and oxidation resistance, prolonging the service life

Active Publication Date: 2015-09-23
新乡市天诚航空净化设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Argon arc welding welding method: the arc flame of argon arc welding is unstable, the heat-affected area is large, and the weld seam is irregular and easy to deform;
[0004] Plasma welding welding method: the arc flame of plasma welding is relatively stable, the weld seam is easy to oxidize, and the high temperature corrosion resistance is poor;

Method used

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  • Aerospace pure oxygen filter and its welding method
  • Aerospace pure oxygen filter and its welding method
  • Aerospace pure oxygen filter and its welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Step 1: Process the filter element frame, tin bronze sintered mesh and matching fixtures;

[0039] Step 2: Clean and remove the oil stains on the surface of the filter element skeleton, tin bronze sintered mesh and welding fixtures to prevent air bubbles during the welding process; clean the workpiece and fixtures with clean acetone solution, and then dry or dry them. No trace of oil stain after drying;

[0040] Step 3: Wrap the tin bronze sintered mesh on the skeleton first, and attach its two ends to the inner surfaces of the process steps at both ends of the skeleton, and then assemble the filter element skeleton and tin bronze sintered mesh with welding fixtures; when assembling, the required filter element The butt seam of the skeleton and tin bronze sintered mesh shall be located in the middle of the gap reserved by the welding fixture, and the butt seam shall be straight. The maximum width of the gap reserved by the fixture shall not exceed 3mm. tight and fasten...

Embodiment 2

[0053] Other steps are with embodiment 1, and electron beam welding parameter is respectively:

[0054] The selection range of high voltage is: 50kV,

[0055] Filament options range from: 19.5mA,

[0056] The selection range of bias voltage is: 1200V,

Embodiment 3

[0058] Other steps are with embodiment 1, and electron beam welding parameter is respectively:

[0059] The selection range of high voltage is: 60kV,

[0060] The selection range of the filament is: 20mA,

[0061] The selection range of bias voltage is: 1800V,

[0062] The following table is the integrity test report of the filter element of the present invention, and the working system of the filter requires the bubble point of the filter element to be greater than 600 Pa.

[0063] serial number

[0064] The electron beam welding method is used to realize the fully welded structure of the filter element. Because the electron beam welding is carried out in a vacuum state, the surface quality and oxidation resistance are very high, which greatly improves the welding performance and serviceability. It also ensures that the filter element can withstand not less than 200 repeated washings under the working condition of 35MPa to ensure the service life of the filter. T...

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PUM

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Abstract

The invention aims at providing an aerospace pure oxygen filter. The surface quality and the oxidation resistance of the filter are very high, and the using strength of a filter element is great. The invention further provides a welding method of the filter element of the aerospace pure oxygen filter. By adopting the welding method, the quality stability and the closeness of a welding core are ensured and the high-temperature corrosion resistance of the welding core is improved. According to the technical scheme, the aerospace pure oxygen filter comprises an upper housing, a lower housing, the filter element and a sealing pad, wherein the filter element is in a fully welded structure and comprises a filter element framework and a filter element filter layer, the filter element filter layer adopts a tin bronze sintered mesh, the filter element framework comprises a framework cylinder body and process steps arranged at the two ends of the framework cylinder body, the filter element filter layer adopts the tin bronze sintered mesh, the tin bronze sintered mesh is wrapped on the framework cylinder body, and the two sides of the tin bronze sintered mesh are close to the inner side surfaces of the process steps of the framework; the sealing pad is made of red copper. The aerospace pure oxygen filter provided by the invention can realize effective and safe filtration of pure oxygen, provide a reliable guarantee for pressure testing of an oxygen supply system and create great benefits for a company.

Description

technical field [0001] The invention relates to a filtering device, in particular to a special spaceflight pure oxygen filter for filtering pure oxygen in a test bench of a rocket fuel oxygen supply system and a welding method thereof. Background technique [0002] In order to ensure the safety of rocket flight, various ground performance tests must be carried out on the rocket before flight. The detection of whether the rocket fuel oxygen supply system works well is also one of the important detection items. The pure oxygen in the oxygen supply system needs to be filtered by a filter before being supplied to the ignition system. Now the filter for filtering pure oxygen is made of stainless steel, which is prone to sparks when a large pressure impacts, and pure oxygen is prone to explosion when encountering sparks, which poses a safety hazard. In addition, the filter element inside the filter also has the following problems in the welding method: [0003] Argon arc welding...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/12C01B13/00B23K15/06
Inventor 崔增菊苟云霞李新彦陈关兴骆金刚
Owner 新乡市天诚航空净化设备有限公司