Centralized self-diagnosis vacuum desorption device and use method thereof

Abstract

The invention discloses a centralized self-diagnosis vacuum desorption device and a use method thereof, the centralized self-diagnosis vacuum desorption device is provided with a plurality of uniform-specification sample cavities, the tail ends of the sample cavities are fixedly provided with quick connectors with one-way valves, the pressure difference between the sample cavities and a reference chamber is measured through a precise pressure difference sensor, and the desorption progress is judged; after sample desorption is completed, the sample cavity can be directly taken down from the desorption system through the quick connector, during measurement, the sample cavity is directly installed at the corresponding position of a measuring instrument, and the centralized self-diagnosis vacuum desorption device has the following advantages that (1) the desorption effect is visual and measurable, and self-diagnosis of the desorption progress can be achieved in combination with a related automatic control algorithm; (2) through modular treatment, the samples subjected to vacuum desorption are regarded as unified modules, so that plug-and-test of the samples is realized, and the time required by desorption pretreatment when the samples are measured and replaced for multiple times is saved; and (3) a vacuum pump is intermittently started and operated, the system energy consumption is low, the noise is low and the service life is long.

Description

technical field [0001] The invention relates to the technical field of sample pretreatment for analysis and testing of porous materials, in particular to a centralized self-diagnosing vacuum desorption device and a use method thereof. Background technique [0002] Vacuum desorption of samples is an important pretreatment link in the characterization and analysis of porous materials. The effect of desorption directly affects the measurement accuracy of parameters such as porosity, permeability, and adsorption capacity. In the current application, the desorption link is generally integrated into the measurement system. At the beginning of the test, according to the type of sample, according to the relevant test standards or test experience, vacuum desorption ranging from 5 to 10 hours is carried out. The sample is continuously exposed to the vacuum environment, and the vacuum pump continues to work to maintain the vacuum level. The disadvantages of this form are obvious: (1)...

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Problems solved by technology

The disadvantages of this form are obvious: (1) Since the vacuum gauge on the vacuum pipeline can only reflect the real-time pressure in the pipeline, it cannot reflect the actual adsorption state of the pores inside the sample, so there is no intuitive way to judge the desorption effect, and it is impossible to Correctly obtain the desorption progress of samples in real time; (2) If there are a large number of samples to be tested, it will take a lot of time to wait for the desorption to complete each time the sample is replaced, and the work efficiency is low; (3) If multiple groups of samples are desorbed at the same time Attached, there may be cross-contamination of desorbed gas; (4) The continuous operation of the vacuum pump has caused energy waste, laboratory noise pollution and other problems

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