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Secondary series-connection enclosed-loop pressure-stabilizing air source with high accuracy for instrument

A high-accuracy, closed-loop technology, applied in the direction of electric fluid pressure control, etc., can solve the problem that it is difficult to meet the stability of air pressure

Inactive Publication Date: 2013-07-10
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pneumatic control is to use various control elements (valve, cylinder, etc.) Barometric pressure stability at flow rate

Method used

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  • Secondary series-connection enclosed-loop pressure-stabilizing air source with high accuracy for instrument

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Embodiment Construction

[0012] Such as figure 1 As shown, the instrument uses a high-accuracy two-stage series closed-loop stabilized gas source, including a gas source supply device, a gas purification device, two electric / pneumatic servo valves, a first control loop and a second control loop.

[0013] The compressed air provided by the air source supply device first passes through the gas purification device to filter out impurities such as water and oil; then flows through the first electric / pneumatic servo valve and enters the first control circuit to obtain a stable pressure gas of 0.8Mpa; then passes through The second electric / pneumatic servo valve enters the second control loop to obtain stable compressed air with artificially set pressure.

[0014] The first control loop includes an air storage tank, a pressure sensor, an A / D module, a D / A module and a computer; the first electric / pneumatic servo valve is installed at the air inlet of the air storage tank, and the pressure sensor is installe...

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Abstract

The invention relates to a secondary series-connection enclosed-loop pressure-stabilizing air generation device with high accuracy for an instrument. According to the invention, compressed air provided by an air source supply device firstly is subjected to the effects of an air purification device to filter out impurities such as water and oil, then the compressed air flows through a first electric / air servo valve and enters a first control loop, thereby obtaining stabilized-pressure air of 0.8Mpa; and then the compressed air enters a second electric / air servo valve and enters a second control loop, thereby obtaining stabilized-pressure compressed air the pressure of which is set artificially at the range of 0.2Mpa-0.6Mpa. According to the invention, the pressure of air in an air storage tank can be detected in real time, and the final air pressure fluctuation is controlled in a small threshold range through the enclosed-loop feedback, so that under the condition of high flow rate, a pure, fine and stable air source is provided for the following experiment equipment.

Description

technical field [0001] The invention belongs to the technical field of pneumatics, and relates to a high-accuracy two-stage series closed-loop pressure-stabilizing gas generating device for instruments. Background technique [0002] The generation and control technology of precision air pressure is more and more widely used in industry, especially the pressure standard device used in the inspection, calibration and verification of pneumatic equipment, which puts forward higher and higher requirements for the control stability and control accuracy of air pressure. Require. For example, in a gas static pressure system, the gas source pressure is a major factor affecting the vibration of the gas film in the gas static pressure system. Even if a large-capacity gas storage tank is used, the pressure of the gas source is still in a state of change, which becomes the gas-solid coupling of the gas film. Therefore, during the research process, the pressure must be strictly controlle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05D16/20
Inventor 李东升沈小燕李敏尹健龙崔廷
Owner CHINA JILIANG UNIV
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