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Gas pressure fast-regulating device and method based on pulse width modulation mode

A Gas Pressure, Pulse Width Modulation Technology

Active Publication Date: 2014-01-01
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of difficult pressure regulation due to the large axial thrust of the high pressure gas on the piston in the existing gas variable volume technology, and propose a gas pressure rapid adjustment device and adjustment method based on pulse width modulation, which is more accurate Accurate gas pressure control provides a quick control method for the front stage

Method used

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  • Gas pressure fast-regulating device and method based on pulse width modulation mode

Examples

Experimental program
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Effect test

Embodiment 1

[0042]Gas pressure rapid adjustment device based on pulse width modulation, the device includes a gas circuit part and a circuit part; the gas circuit part includes a gas source 1, a pressure reducing valve 2, a filter 3, a boost solenoid valve 4, and a pressure relief solenoid valve 5 , pressure transmitter 6, gas capacity 8 and test port 9;

[0043] The booster solenoid valve 4 and the pressure relief solenoid valve 5 are all normally closed solenoid valves, which are respectively driven by pulse width modulation, that is, the switching frequency of the solenoid valve is adjusted by changing the period of the control pulse train, and the width of the control pulse is changed. Or the duty cycle, to adjust the length of time for the solenoid valve to be opened or closed;

[0044] The gas source 1 is connected to the pressure reducing valve 2 through a pipeline, the pressure reducing valve 2 is connected to the filter 3 through a pipeline, the outlet of the filter 3 is connecte...

Embodiment 2

[0066] The gas pressure rapid adjustment method based on the pulse width modulation method, the steps are:

[0067] Step 1: The input target pressure value is 0.5MPa, adjust the pressure reducing valve 2, so that the output pressure of the air source 1 is 1.5MPa, and the single-chip microcomputer 11 converts the input target pressure value into a voltage value V proportional to it 1 =2.5V, the pressure transmitter 6 measures the current pressure as 1MPa, and the AD sampling chip 10 collects the voltage value V fed back by the pressure transmitter 6 2 =5.0V, and sent to the single-chip microcomputer 11, the single-chip microcomputer 11 pairs voltage value V 1 , V 2 is compared, the result is V 2 greater than V 1 , immediately the current pressure is greater than the target pressure, the channel B15 of the solid state relay 13 is closed, the 12V voltage is applied to the pressure relief solenoid valve 5, the pressure boost solenoid valve 4 is closed, the pressure relief solen...

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Abstract

The invention relates to a gas pressure fast-regulating device and method based on the pulse width modulation mode and belongs to the technical field of static pressure measurement and calibration. The device comprises a gas channel part and a circuit part. The gas channel part comprises a gas source (1), a pressure relief valve (2), a filter (3), a pressurizing solenoid valve (4), a pressure relief solenoid valve (5), a pressure transmitter (6), a gas capacitor (8) and a test port (9). According to the device and method, through the flow control mode, a wider pressure regulating range is obtained, the solenoid valves are driven by adopting the relatively cheap pressure transmitter and reasonable circuit design and combining the pulse width modulation mode to save a large amount of time for digital acquisition and pressure control, and preceding-stage fast control is provided for higher accuracy gas pressure control.

Description

technical field [0001] The invention relates to a gas pressure rapid adjustment device and an adjustment method based on a pulse width modulation method, and belongs to the technical field of static pressure measurement and calibration. Background technique [0002] Pressure, like other physical parameters, is an indispensable control parameter in industrial production processes and automation processes, and its measurement accuracy directly affects the economic benefits of production and energy utilization. Due to the large number and high requirements of pressure verification and calibration, it is necessary to have a high-performance and automatic pressure calibration device. [0003] The traditional gas piston pressure gauge, because it can only generate discrete pressure points and needs to move weights, cannot quickly generate target pressure, etc., is not suitable for on-site calibration and quickly providing target pressure values ​​for external devices. In recent y...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05D16/20
Inventor 彭轶盛晓岩李鑫武张贤王丽闫继超
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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