Air tightness detecting device and servo control method thereof

An air tightness detection and to-be-detected technology, which is used in measuring devices, fluid tightness testing, and liquid tightness measurement using liquid/vacuum degree, etc. Low problems, to achieve good economy, simple structure, avoid pressure shock effect

Active Publication Date: 2016-12-07
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0004] In view of the above defects or improvement needs of the prior art, the object of the present invention is to provide an airtight detection device and its servo control method, wherein by improving the key control loop design and servo control process in the device, it is different from the existing Compared with the technology, it can effectively solve the problems of low

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  • Air tightness detecting device and servo control method thereof
  • Air tightness detecting device and servo control method thereof

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Embodiment 1

[0052] Take the fuel system airtight test as an example, such as figure 1 As shown, the servo control method of the airtight detection device includes two pressure control loops.

[0053] The first pressure control loop includes a pressure source (i.e. the first air source), an electro-pneumatic proportional / servo valve, a controlled cavity—an oil bag, a high-precision pressure sensor, an analog / digital conversion, and a digital controller. In the first pressure control system, the controlled object is the oil bag; the actuator is the electric-pneumatic servo device (that is, the first electric-pneumatic proportional / servo valve); the feedback element is a high-precision pressure sensor; the digital controller is the control element .

[0054] The process of air pressure control is essentially the inflation and deflation process of the controlled cavity, and the air pressure in the controlled cavity is adjusted by adjusting the total amount of air in the controlled cavity thr...

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Abstract

The invention discloses an air tightness detecting device and a servo control method thereof. The air tightness detecting device comprises a first gas source, a first pressure sensor and a first proportional servo valve. The first gas source and the containing cavity of a first object to be detected are connected by a first proportional servo valve. The first pressure sensor is connected to the containing cavity of the first object to be detected and is used for detecting the pressure in the containing cavity of the first object to be detected so as to judge the air tightness of the containing cavity of the first object to be detected. The first pressure sensor is also connected to the first proportional servo valve and is used for adjusting the state of the first proportional servo valve. Through improving control loop design and a server control process, the problems of the low accuracy of a direct pressure testing method and the inconvenient operation of a differential pressure test method are solved effectively, according to the device and the corresponding servo control method, the opening of an electro-pneumatic proportional servo valve is controlled through a closed-loop system to control the flow of gas in the loop, and the air tightness of the system can be detected.

Description

technical field [0001] The invention belongs to the technical field of air tightness detection, and more specifically relates to an air tightness detection device and a servo control method thereof. Background technique [0002] Air tightness testing is an important means to measure the sealing performance of many industrial products, especially in aerospace, aviation, instrument and other industries, air tightness testing is an important and frequently used testing method. The traditional manual airtight detection method is cumbersome and labor-intensive. At the same time, due to human factors, it is easy to cause missed and false detections. With the continuous development of microelectronics technology and pneumatic technology, airtight detection methods have also been improved. At present, the most widely used airtight detection methods are direct pressure test method and differential pressure test method. The direct pressure test method is to fill the measured contain...

Claims

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Application Information

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IPC IPC(8): G01M3/32
CPCG01M3/3236
Inventor 杨钢杜经民李宝仁傅晓云高隆隆高磊陈云刘柏林
Owner HUAZHONG UNIV OF SCI & TECH
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