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Method for measuring pressure of constant-volume quick inflation/deflation air cavity

A gas pressure and pressure technology, which is applied in the field of gas pressure measurement, can solve problems such as inaccurate pressure measurement, and achieve the effect of improving measurement accuracy and detection result accuracy.

Active Publication Date: 2013-11-27
平邑仁安中医药产业发展有限公司
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Problems solved by technology

[0004] In order to solve the problem of inaccurate measurement of the internal pressure of the container during the process of rapid filling and deflation at constant volume, the present invention proposes a method for accurately measuring the internal pressure of the container using a gas mass flow sensor and a pressure sensor

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  • Method for measuring pressure of constant-volume quick inflation/deflation air cavity
  • Method for measuring pressure of constant-volume quick inflation/deflation air cavity
  • Method for measuring pressure of constant-volume quick inflation/deflation air cavity

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[0040] As mentioned above, since there is currently no sensor that can directly and effectively measure the instantaneous pressure inside the sealed volume, it is difficult to directly obtain the real pressure value in the container. The internal pressure P of the container during the deflation process M (theoretical pressure), container inlet / outlet gas mass flow Q, container inlet / outlet pressure P a Three important parameters (standard theoretical values), the Q, P a Substituting calculation formulas (1) and (2) to calculate the instantaneous pressure value P inside the container obtained by the present invention r , and further compare P M ,P a ,P r The relationship between the three, thereby verifying the necessity and effectiveness of the present invention.

[0041] Firstly, the computational fluid dynamics simulation software FLUENT is used to numerically simulate the constant volume pulse charging and deflation process. A cylindrical vessel with a diameter of 30m...

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Abstract

Provided is a method for measuring the pressure of a constant-volume quick inflation / deflation air cavity. In the constant-volume quick inflation / deflation process, gas mass flow and pressure data of an entrance of a container are detected in real time, the obtained data through detection is subjected to the averaging processing, and the pressure value of the inside of the container is obtained in the mode that the obtained data is substituted to the calculation formula of the pressure in the container in the inflation or deflation process. The method is good in realizability, and can be applied to occasions where pressure in the container needs to be accurately measured online in the constant-volume quick inflation / deflation process.

Description

technical field [0001] The invention relates to a method for measuring gas pressure, in particular to a method for indirectly and real-time measuring the internal pressure of a fixed container by using a gas mass flow sensor and a pressure sensor during the rapid inflation and deflation process. Background technique [0002] Constant volume fast filling and deflation process (the total filling and deflation time is tens to hundreds of milliseconds) has been widely used in many fields, such as precision lubrication of aerospace instruments, quantitative dispensing in surface mount, chemical biochemical , pharmaceutical and medical industry reagent preparation and quantitative dispensing and drug delivery, etc. Its characteristics are: (1) The liquid material sealed in the syringe is extruded from the needle through a narrow pulse high-pressure gas, and then the container inlet is quickly connected to the atmosphere through the directional control valve in the pneumatic circui...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L11/00
Inventor 陈从平张涛邹雷董小刚汪卫郭世杰
Owner 平邑仁安中医药产业发展有限公司
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