Calculation of the response time of vacuum pressure switches

The response time calculation of vacuum pressure switches involves multiple factors. The following is an analysis of its response time calculation:

The relevant elements of response time calculation

System composition influence: In the pneumatic vacuum generator system, the pressure response of the vacuum circuit is mainly divided into the pressure response of the chamber and the pressure response of the pipeline. Different components have different influences on the response time and need to be comprehensively considered.

Limitations of empirical formulas: In the past, the empirical formula T=60V/Q was commonly used to estimate the pressure response time in vacuum systems, where V is the volume of the vacuum chamber and Q is the average volume flow rate of the suction flow beam. However, this formula was determined by empirical methods and often deviated from the actual situation.

Acquisition of dynamic pressure response curve: To obtain the dynamic pressure response curve, it is necessary to further fit the pressure changes in the loop using an exponential relationship based on empirical parameters, so as to more accurately reflect the response time.

Measures to optimize response time

Optimize pipeline design: The pipelines connecting the inflation device, pressure stabilizing chamber, valves and test chamber should be as short, thick and straight as possible to shorten the time for obtaining vacuum pressure and the rapid expansion pressure balance process, thereby optimizing the response time.

Consider the system parameters: The pressure-time constant of the system can be measured by experimental methods. That is, after time T, the pressure drops to 63.2% of the maximum vacuum degree. This time T is the pressure-time constant of the system, which is of great significance for calculating the response time.

Select the appropriate equipment: Different types of vacuum pressure switches have different response times. The response time of common vacuum pressure gauges is ≥100 milliseconds. Currently, the response time of the highest-level fast-response vacuum pressure gauge in the industry is less than 1 millisecond. You can choose according to actual needs.