Methanol is a flammable and explosive liquid can be selected pump centrifugal pump, self-priming pump, screw pump, diaphragm pump, metering pump, magnetic pump, if driven by a motor must be explosion-proof motor, a centrifugal pump impeller to use copper impeller sealing rubber is also oil resistant rubber. For example, fluorine rubber is methanol resistance material.
Technical requirements for the use of methanol as a metering pump
1, function
2, structure and performance
1) the metering pump is a high performance mechanical diaphragm metering pump with adjustable flow and adjustable frequency (4-20MA control) by manual adjustment. The motor of the metering pump is integrated with the integrated motor of the frequency converter, and the explosion-proof type is EExdIICT4. Using the transmission mechanism of crank ball drive mechanism, the life of the pump body is over 20 years, and the maintenance period of continuous operation is more than 25000 hours. The flow rate of the pump can be within the range of 0-100%.
2) the metering pump uses a double-layer shell anticorrosion function pump, which can resist the corrosion of the pump body caused by the leakage of the liquid spatter. The core component of the conveying unit is the metering diaphragm, which seals the pump head, and the liquid produces displacement in the head of the pump. The pump head is made of PVDF or PTFE material. The end disk made of chemical anticorrosive material separates the transmission box from the conveying unit with the safety diaphragm to prevent the driving part from being corroded when the diaphragm failure occurs. Liquid transport is achieved through the combined action of the suction valve and the same structure of the drain valve and diaphragm movement.
With the use of pulsating dampers, safety valves and back pressure valves, the precision is up to &plusmn, more than 2%, and the maintenance period of the diaphragm can be reached over 25000 hours.
3) the dosing metering pump is completed by the transmission box, the hydraulic end, the motor and the flow regulation through the 4-20MA precise control of the built-in inverter. It can also be manually controlled. In manual state, the dosing frequency can be adjusted accurately to adjust the dosage. It can also be adjusted by adjusting the stroke length knob, and the built-in stroke sensor.
4) the hydraulic end part of the metering pump includes the diaphragm, the unidirectional ball valve and the shell of the pump head. The check valve with the valve body and the valve seat ceramics, PTFE seals and gaskets, valve ball for ceramics, high precision, strong corrosion resistance, to ensure the accuracy and stability of metering pump. The material of the pump head is PVDF.
A, diaphragm should not be set before the limiting plate, so that the material is greatly improved, and the resistance is reduced. The maintenance work of the hydraulic end part is greatly reduced, the replacement of the diaphragm and the dismantling of other components are easy and easy, without any special tools.
Polytetrafluoroethylene (PTFE) PTFE is selected for B and diaphragm materials. Under normal working conditions, the continuous operation life of diaphragm should be at least 25000 hours.
5) when the metering pump runs, the noise of the pump is not higher than 70dB (A), the bearing temperature is not higher than 65 degrees C, no abnormal vibration, and there is no leakage at each seal. The suction range of the metering pump should not be less than 3 meters, in order to ensure that the pump is sucked from the pool.
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