Gas tightness detector and method for testing internal volume of container by aid of gas-release process

Abstract

The invention relates to a gas tightness detector and a method for testing the internal volume of a container by the aid of a gas-release process. The gas tightness detector comprises a gas tightness detector gas circuit electrically connected with a microcontroller, a pressure sensor and a temperature sensor are mounted on a channel of the gas circuit between the detected container and a gas-release valve, and a gas inlet valve pipeline is connected with a high-pressure gas source. When a measuring and controlling module in the microcontroller controls a gas inlet valve to be opened, and gas of the high-pressure gas source flows into the detected container, namely, a gas tightness detecting process is started; when detection is completed and the gas is about to be released, the measuring and controlling module acquires the pressure PH and the initial temperature TH of the inside the detected container in an initial state via the pressure sensor and the temperature sensor; the measuring and controlling module controls the gas-release valve to be opened and starts counting, the immediate pressure P of the tested container in each real-time state is acquired, moments t respectively corresponding to starting of the gas-release process and acquisition of the pressures of the detected container in various real-time states are recorded, and a series of internal volume values of the detected container are obtained according to the immediate pressures, which are detected at the various moments, of the inside of the detected container; and a final internal volume value of the detected container is obtained by data statistics processing.

Description

technical field [0001] The invention belongs to the field of detecting the inner volume of a container, in particular to an air tightness detector and a method for testing the inner volume of a container by using a deflation process. Background technique [0002] The internal volume of the container is one of the important characteristic parameters of the part. At present, there are many methods for measuring the internal volume of the container, including direct and indirect methods. The direct method is measured by size, which is obviously not suitable for volumes with irregular shapes or volumes assembled from multiple parts. The indirect method is to measure the volume of the container by filling the liquid and conversely by the volume of the liquid, which requires the material of the container to be resistant to rust and corrosion; there is a method of changing the volume, which is to connect an external or internal The container with known volume is connected with the...

AI Technical Summary

Problems solved by technology

The actual deflation process is a very complicated process, which is affected by many factors such as the temperature of the gas source and the environment.

In addition, the physical model established by it theoretically believes that the flow rate is constant. In fact, the flow rate is constant only when the initial pressure of the container is very high. Therefore, the volume error calculated by this inventive method is relatively large.

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