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A gas permeability testing device

A gas permeability and testing device technology, which is applied in the direction of measuring devices, permeability/surface area analysis, suspension and porous material analysis, etc., can solve problems such as gas permeability testing, achieve simple structure, high flexibility, and reduce errors Effect

Inactive Publication Date: 2018-09-28
CHINA SPECIAL EQUIP INSPECTION & RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the lack or insufficiency of existing devices and technologies, and solve the gas permeability test problem of tubular non-metallic materials according to the gas permeability test standard requirements of ASME

Method used

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Embodiment

[0034] Such as figure 1 As shown in the illustration, connect and assemble the vacuum pump III, the first vacuum gauge IV, the second vacuum gauge V, the test gas chamber I, the test chamber II, the first pipeline VI, and the second pipeline VII, and connect the test sample 1 according to figure 2 The shown clamp is fixed in the vacuum chamber in the fixture, and the vacuum chamber is divided into two parts: the test gas chamber I and the test chamber II. Close the first vacuum breaking valve A and the second vacuum breaking valve D, open the first vacuum valve B and the second vacuum valve C, turn on the vacuum pump III to evacuate the test gas chamber I and the test chamber II; measure through the first vacuum gauge IV The vacuum degree of the test chamber II is measured by the second vacuum gauge V to measure the vacuum degree of the test gas chamber I; when the vacuum degree of both reaches the background vacuum degree, such as <100Pa, close the first vacuum valve B and t...

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Abstract

The invention discloses a gas permeability testing device and relates to the technical field of material barrier property detection. The testing device comprises a vacuum cavity, a vacuum pump, a first pipeline, a second pipeline and a control system. The vacuum cavity is divided by a test sample into a test-gas cavity and a testing cavity. The testing cavity is communicated with the vacuum pump through the first pipeline. The test-gas cavity is communicated with the vacuum pump through the second pipeline. The control system is used for controlling automatic opening and closing of valves on a control pipeline, acquires pressure values and inputs the values into a computer. The testing device can test and analyzes gas permeability of a tube type sample according to ASME standards. Single-zone vacuum degrees are controlled independently by adoption of a plurality of the valves, so that flexibility is high. The testing device is simple in structure and reliable. A whole testing process is automatically controlled, thus reducing errors caused by manual operation.

Description

technical field [0001] The invention relates to the technical field of material barrier property detection, and relates to a device for testing the gas permeability of tubular materials. Background technique [0002] Non-metallic materials for pressure equipment, especially inorganic non-metallic materials, such as graphite, often have the problem of lower density than metal materials because the components are made by powder impregnation, sintering and other processes. Therefore, when such materials are used as pressure equipment materials, they must meet the requirements of sufficiently low gas permeability. In the relevant testing standards of the American Society of Mechanical Engineers (ASME) for graphite pressure vessel materials, the differential pressure method is mandatory for testing the gas permeability of graphite non-metallic materials, but the specific testing method is not specified. At present, my country's pressure vessel industry does not yet have special ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 宋明徐彤王汉奎寿比南
Owner CHINA SPECIAL EQUIP INSPECTION & RES INST
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