Control system and control method for opening and closing type pump test

Abstract

The invention belongs to the technical field of hydraulic transmission and control and particularly relates to a control system and a control method for an opening and closing type pump test. An input end of a booster pump of the system is connected with a pool. An output end is connected with an input end of an electromagnetic flowmeter B. An output end of the electromagnetic flowmeter B is connected with a water supplying opening of a water storage tank and the input end of the electromagnetic flowmeter B is further connected with the pool. A liquid level transmitter is arranged at the top of the water storage tank. A vacuum pump is connected with a vacuum opening of the water storage tank. An air compressor is connected with a booster opening of the water storage tank. An inlet of the water storage tank is connected with an outlet of an electric three-way valve. An outlet of the water storage tank is connected with an input end of a testing pump. An output end of the testing pump is connected with an input end of an electromagnetic flowmeter A. An output end of the electromagnetic A is connected with an operation end of the electric three-way valve. A water discharging end of the electric three-way valve is connected with the pool. According to the system, a cavitation test is performed to a tested pump on the condition of opening or closing and equal liquid level control is performed to liquid in the water storage tank on the condition of opening so that smooth completion of the cavitation test is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of fluid transmission and control, and in particular relates to an open-close pump test control system and a control method. Background technique [0002] Commonly used pump test systems are divided into open system and closed system. The open system means that the test pump absorbs water from a pool with a free liquid surface. The pool has large capacity, good heat dissipation conditions, and stable flow; but its disadvantage is that when the cavitation test method that keeps the flow constant is used, the inlet of the pump is throttled. The valve reduces the inlet pressure of the pump, which will cause the inlet flow to be unstable, thus affecting the measurement accuracy of cavitation performance. The closed system is that the test pump absorbs water from the closed container, and the liquid in the system is isolated from the outside air, forming a closed circulation system alone. The closed container is...

AI Technical Summary

Problems solved by technology

The open system means that the test pump absorbs water from a pool with a free liquid surface. The pool has large capacity, good heat dissipation conditions, and stable flow; but its disadvantage is that when the cavitation test method that keeps the flow constant is used, the inlet of the pump is throttled. The valve reduces the inlet pressure of the pump, which will cause the inlet flow to be unstable, thus affecting the measurement accuracy of cavitation performance

The closed system is that the test pump absorbs water from the closed container, and the liquid in the system is isolated from the outside air, forming a closed circulation system alone. The closed container is vacuumed to reduce the pressure of the suction liquid surface, and the measurement accuracy of the cavitation performance is high; but its disadvantages When the flow rate is large, the system heats up seriously

[0003] With the continuous expansion of pump design flow, the existing pump test system can no longer meet the requirements of pump performance test and cavitation test, and it is urgent to design a new pump test system according to the characteristics of different working conditions

Images