面向进水电磁阀性能测试的恒压恒流供水系统设计

针对洗衣机及洗碗机进水电磁阀性能检测中的多级水压控制问题，首先介绍电磁阀性能测试流程，根据电磁阀性能测试要求进行恒压恒流供水系统设计。通过分析恒压恒流供水系统原理，设计出恒压控制电路、恒流控制电路、霍耳型流量传感器信号检测电路及控制流程，最后对恒压恒流供水系统进行应用实验。实验结果表明：恒压恒流调节控制快速，且调节后预置值与实际值误差较小，可以满足各种水压、水流量测试要求。

Design of Constant Pressure ＆ Flow Water Supply System for Feedwater Electromagnetic Valve Performance Testing

Facing to multistage hydraulic control problem of dishwasher and its feedwater electromagnetic valve performance testing, the process of electromagnetic valve performance testing was introduced and constant pressure ＆ flow water supply system was designed based on the requirements of electromagnetic valve performance test. The constant pressure control circuit, constant flow control circuit, signal detection circuit of hall flow sensor and control software were designed through the analysis of constant pressure ＆ flow water supply system principle. Finally, experiments were conducted in the constant pressure ＆ flow water supply system. The experiment results showed that constant pressure ＆ flow regulation was rapid, and the error between prevalue after the regulation and actual value was very small. Therefore, the constant pressure ＆ flow water supply system can meet the testing requirements of various kinds of hydraulic pressures and water flow.