Diaphragm pump by their ticketenforcement agencies use the power, can be divided into pneumatic, electric, hydraulic and three, that is the source of compressed air powered pneumatic diaphragm pump, the electric power source for electric diaphragm pump, the liquid medium (such as oil) pressure powered electric hydraulic diaphragm pump. In addition, according to their functions and features, as well as solenoid valves, electronic, intelligent, fieldbus type diaphragm pump etc.. The diaphragm pump has a wide variety of products and a variety of structures, and it is still constantly updating and changing.
The role of diaphragm pump in process control is to accept the control signal of the regulator or computer, change the flow rate of the modulated medium, and keep the regulated parameter within the required range, so as to achieve the automation of the production process. If the automatic adjustment system is compared with the manual adjustment process, the detection unit is the human eye, the adjusting control unit is the human brain, then the execution unit — the diaphragm pump is the human's hands and feet. To realize the adjustment and control of some parameters, such as temperature, pressure, flow rate, liquid level, and so on, can not be separated from the diaphragm pump. The choice of diaphragm pump is very meticulous work, not only have a solid theoretical knowledge, but also have rich experience in practice. Good selection not only helps adjust the PID parameters of the control loop, but also makes the adjusted parameters get better control effect, and also greatly increases the service life of diaphragm pumps. Starch cyclone
In the specific choice, the following aspects can be considered.
(1) the shape structure of the valve core is mainly considered according to the selected flow characteristics and unbalance force.
(2) when the fluid medium is a suspension containing high concentration abrasive particles, the joint face of the valve core and seat will be severely friction when the fluid medium is a suspension containing high concentration of wear particles. So the flow of the valve should be smooth and the internal material of the valve should be hard.
(3) corrosion resistance of the medium because of the corrosive medium, in the case of meeting the adjustment function, as far as possible to choose the simple structure of the valve.
(4) when the temperature and pressure of the medium are high and the pressure is high and the pressure varies greatly, the valve with the valve core and the valve seat should be selected by the temperature and pressure.
(5) prevent flash and cavitation flash and cavitation only in liquid medium. In the actual production process, flash and cavitation not only affect the calculation of the discharge coefficient, but also form vibration and noise, and shorten the service life of the valve, so we should prevent the valve from flash and cavitation when selecting valves.
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