Control system and control method for pumping and metering of easy-to-vaporize medium

Abstract

The invention provides a control system for the pumping and metering of an easy-to-vaporize medium. The control system is characterized by comprising a control mainboard, a coder, a flow measurement converter, an electric control valve, an oil-gas separator, a frequency converter, a voltage control device, an oil monitor, an indication device, a magnetic pump and a magnetic pump motor, wherein the voltage control device, the frequency converter, the magnetic pump, the magnetic pump motor, the oil-gas separator, the electric control valve, the flow measurement converter, the coder, the control mainboard and the indication device are in signal connection in sequence; the control mainboard is also in signal connection with the voltage control device and the electric control valve respectively; the oil monitor is also connected with an easy-to-vaporize medium outlet; and an easy-to-vaporize medium storage device is also connected with the flow measuremen converter, the magnetic pump and the magnetic pump motor respectively. The invention also discloses a control method for the control system. By the control system and the control method, heat produced by the magnetic pump can be effectively reduced, the reliability of the magnetic pump can be improved, and the magnetic pump can be widely applied to the pumping and metering of the easy-to-vaporize medium.

Description

technical field [0001] The invention relates to a control system and a control method for pumping and metering of easily vaporized medium. Background technique [0002] In general, easy-to-vaporize medium is usually defined as a fluid medium with a vaporization pressure greater than 5kPa and a viscosity less than 1cSt at a certain working temperature. At present, the pumping and metering of easily vaporized medium usually adopts the pumping and metering mode of motor + vane pump, and the easily vaporized medium has the characteristics of low viscosity and high saturated vapor pressure, so it is often pumped and metered , due to leakage, cavitation and other reasons, the pumping efficiency is extremely low. [0003] The magnetic pump is a magnetic drive pump, which relies on the magnetic field to drive the impeller of the pump. There is a partition between the pump chamber and the motor, and there is no leakage of the pump shaft. It is a non-leakage machine. However, when t...

Images