Pneumatic hydraulic combined control device for detecting safety performance of pressure controller

Abstract

The invention discloses a pneumatic hydraulic combined control device for detecting safety performance of a pressure controller. The pneumatic hydraulic combined control device comprises a hydraulic proportioning system, a pneumatic control system and a computer control system, wherein the hydraulic proportioning system and the pneumatic control system are connected into a pneumatic hydraulic combined control system through a solenoid directional valve and an energy accumulator; the hydraulic proportioning system, the pneumatic control system and the pneumatic hydraulic combined control system are respectively connected to a computer control system and a PID (Proportion Integration Differentiation) regulator, for respectively controlling liquid and / or gas as a medium; an electric-liquid proportion control system and a gas-liquid proportion control system characterized by closed-loop control are realized under the action of an industrial personal computer in a computer control system and the PID regulator; and an output pressure changes according to a preset input pressure curve in the computer control system. The pneumatic hydraulic combined control device has the beneficial effects that the requirements of detecting the safety and performance of the pressure controller about manufacturing deviation and drifting, temperature rising and durability are met within a pressure range of 60kPa and 4.2MPa.

Description

technical field [0001] The invention relates to a liquid-gas combined control device for testing the safety performance of a pressure controller, belonging to the technical field of pressure controllers. Background technique [0002] At present, in the safety and performance testing of pressure controllers for household and similar purposes, it is necessary to use liquid and / or gas (usually air) as the medium, and within the pressure range of -60kPa to 4.2MPa, the pressure change meets the programmable requirements (linear, constant value, rectangular and trapezoidal curves), and the test equipment meets the reliability requirements (at least one million pressure change levels). However, when the gas medium is within the pressure range of 1.2MPa to 4.2MPa, it is difficult to realize the programmable pressure and equipment reliability, which is manifested in: the discharge pressure of ordinary air compressors does not exceed 1.2MPa, and the electric-pneumatic proportional con...

AI Technical Summary

Problems solved by technology

However, when the gas medium is within the pressure range of 1.2MPa to 4.2MPa, it is difficult to realize the programmable pressure and equipment reliability, which is manifested in: the discharge pressure of ordinary air compressors does not exceed 1.2MPa, and the electric-pneumatic proportional control valve The working pressure usually does not exceed 1MPa; if the closed-loop control of the booster cylinder is used, the piston will reciprocate back and forth, and the piston ring will be easily worn. Once the sealing performance deteriorates, the booster cylinder will lose its booster function

Therefore, the control device for pressure controller safety performance testing to meet the requirements of pressure programmable and equipment reliability in the pressure range of -60kPa to 4.2MPa for the gas medium has not yet come out.

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