Design and Experiment of Comprehensive Alternating Pressure Testing Machine

At present, the piston reciprocating alternating testing machine can not be used in the alternating tests for gas medium pressure instruments, vacuum instruments, positive and negative pressure gauges and differential pressure instruments under a static pressure environment. A comprehensive alternating pressure testing machine was designed to operate under this environment. Firstly, according to the upper and lower limits of the alternating test requirements for general pressure gauges, precision pressure gauges and digital pressure gauges, frequency and times parameters are analyzed. Secondly, the sinusoidal pressure pulse generator is selected, the sinusoidal frequency is collected by a counter, and the inlet solenoid valve is controlled to automatically stop testing within the preset alternating times. The experimental results of the designed prototype show that the upper limit, lower limit and frequency range of the pressure sine wave produced by the controllable inlet and outlet solenoid valves fall in the range of the evaluation program, and the control error between upper and lower limited data is limited as 0.3%.The alternating frequency error by the controllable inlet and outlet flow valves shall be no more than ± 5 times/min, which meets the requirement of the evaluation program. The number recorded by the counter is consistent with the number of actual tests.