Unlock instant, AI-driven research and patent intelligence for your innovation.

Device and method for testing air tightness of hollow cathode emitter assembly

An air tightness test, hollow cathode technology, which is applied in the direction of using liquid/vacuum degree for liquid tightness measurement, by measuring the acceleration and deceleration rate of fluid, etc., can solve the problem of mass production of unfavorable products, inconsistent leak detection methods, and error in test results. and other problems, to achieve the effect of improving reliability, low cost and simple structure

Pending Publication Date: 2022-04-12
SHANGHAI INST OF SPACE PROPULSION
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the early days, the leakage detection method of the emitter assembly used multiple gaskets of various specifications to be spliced ​​with the emitter assembly and then connected to the leak detection instrument for leak detection. There was no special airtight test device. This method had multiple splicing gaps and inconsistent leak detection methods. In some cases, there will be large errors in the test results, and the efficiency is low, which is not conducive to the mass production needs of future products.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Device and method for testing air tightness of hollow cathode emitter assembly
  • Device and method for testing air tightness of hollow cathode emitter assembly
  • Device and method for testing air tightness of hollow cathode emitter assembly

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Embodiment 1 provides a hollow cathode emitter assembly airtightness testing device and method for testing the airtightness of the hollow cathode emitter assembly, using the structure of the hollow cathode emitter assembly itself to install airtight tooling on the inlet flange , connect the test device pipeline, such as figure 1As shown, the device includes an airtight tooling 1, the airtight tooling includes a protective cap, a compression cover, an adapter cap, and also includes a hollow cathode emitter assembly 2, a gas distribution system 3, a leak detector 4, an air supply valve 5, Barometer 6, absolute ethanol tank 7, and related hollow cathode structures mainly include cathode tube, cathode top, and intake flange.

[0060] The airtight tooling 1 is installed on the hollow cathode emitter assembly 2; the gas distribution system 3 supplies air to the hollow cathode emitter assembly 2 through the air supply pipeline; the test equipment performs an airtightness test ...

Embodiment 2

[0063] Embodiment 2 provides a kind of airtightness testing device and method for a hollow cathode emitter assembly for a typical hollow cathode airtightness test, using the structure of the hollow cathode itself, installing an airtight tooling on the inlet flange, and connecting the test device tube road, such as figure 1 As shown, the device includes an airtight tooling 1, the airtight tooling includes a protective cap, a compression cover, an adapter cap, and also includes a hollow cathode emitter assembly 2, a gas distribution system 3, a leak detector 4, an air supply valve 5, Barometer 6, absolute ethanol tank 7, and related hollow cathode structures mainly include cathode tube, cathode top, and intake flange.

[0064] The airtight tooling 1 is installed on the hollow cathode emitter assembly 2; the gas distribution system 3 supplies air to the hollow cathode emitter assembly 2 through the air supply pipeline; the test equipment performs an airtightness test on the air-s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a hollow cathode emitter assembly air tightness testing device and method. The hollow cathode emitter assembly air tightness testing device comprises an air tightness tool, a hollow cathode emitter assembly, an air distribution system, a leak detector, an air supply valve, a barometer and an absolute ethyl alcohol tank, and the hollow cathode emitter assembly mainly comprises a cathode tube, a cathode top and an air inlet flange. A hollow cathode of an electric thruster in a general electric propulsion system is required to be sealed, the ignition performance and the emission capacity of a hollow cathode product are directly determined by the internal air pressure of a cathode tube, and the sealing performance of the cathode tube is an important basis for the specific impulse of the electric thruster to reach the standard. The hollow cathode emitter assembly is generally formed by welding an air inlet flange, a cathode tube and a cathode top and at least comprises two different types of welding seams, and qualified assemblies are screened through leakage detection of the welding seams in the production process for follow-up assembly. The testing device and method can greatly reduce the error of the leak detection result of the hollow cathode emitter assembly, and improve the leak detection efficiency and credibility.

Description

technical field [0001] The invention relates to the field of aerospace propulsion technology, in particular to a device and method for testing air tightness of a hollow cathode emitter assembly. Background technique [0002] Compared with chemical propulsion, electric propulsion has a high jet velocity and has a higher specific impulse, which can significantly save propellant, increase the life of the spacecraft or reduce the carrying requirements. In order to meet future missions such as space cargo, manned flight, and deep space exploration, various countries are committed to developing high-specific impulse and high-power electric propulsion systems. Hollow cathodes are the core components for ignition and plume neutralization of electric propulsion systems. The capacity directly affects the specific impulse index of the thruster. [0003] The hollow cathode uses a high-temperature vacuum electron emitter material, and the beam flows through the small hole on the top of ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01M3/26
Inventor 董思远张岩王亚楠乔彩霞陈庆夏启蒙孙江宏
Owner SHANGHAI INST OF SPACE PROPULSION