Principle 2 diaphragm metering pump structure

if one diaphragm is damaged, the diaphragm to double diaphragm after. Diaphragm leak detection system immediately alarm, and the other a diaphragm can still maintain a run for a day. Maintenance personnel have plenty of time to take measures to not make the hydraulic oil blended with measuring fluid or leakage, ensure that under the condition of the complex and severe medium sealing peace and running of the equipment life.
the fixed stroke of the diaphragm metering pump diaphragm pump structure improvement

especially fixed stroke diaphragm pump, diaphragm metering pump fault is easy to rupture of diaphragm. Once the diaphragm rupture, measuring fluid and hydraulic system pollution each other, severe losses. By adding auxiliary pneumatic valve and using the double diaphragm with alarm, make diaphragm metering pump operation more safe and reliable.

a, diaphragm metering pump structure principle:

high measuring accuracy, the diaphragm metering pump because of its zero leakage. Low noise, widely used in petroleum, chemical, pharmaceutical, textile and other industries. Usually transport inflammable, explosive, toxic, corrosive and radioactive liquid.

by hydraulic drive on both sides of the diaphragm alternately to bend, diaphragm metering pump is composed of motor, drive mechanism and pump head. Through the transmission device of the motor rotation transformation pillars of reciprocating motion. Intercropping two endpoints plunger in the pump cylinder reciprocating motion. The working process of the completion of suction and discharge.

is comprised of cab, hydraulic chamber and the hydraulic oil tank ( Figure the diaphragm pump head is actually the transmission components.
on the diaphragm and the hydraulic chamber is separated. Hydraulic chamber and the hydraulic oil tank by hydraulic pneumatic valve plunger, dual function and built in oil and gas move off valve. Double function hydraulic pneumatic valve consists of vent pneumatic valve and pressure relief valve. Exhaust pneumatic valve in the hydraulic chamber, cab and measurement fluid contact. To eliminate caused by gas in the hydraulic chamber gather measurement error; Pneumatic valve to protect the pump pressure relief. To prevent overpressure.

the diaphragm pressure to control the push rod, after the completion of the intake stroke. And push it to the check point. Fill oil and gas valve and the hydraulic chamber connected at this time. If the vacuum to setting of the hydraulic chamber to form, fill in oil and gas valve open, to do mechanical oil compensating. The hydraulic oil tank by getting to the hydraulic chamber, in order to balance the exhaust pneumatic valve and piston seal discharge to the oil in the tank.

2, structure improvement and effect:

add auxiliary pneumatic valve:

after start must ensure that the diaphragm on the bearing surface. If placed in the front bearing surface. Pump starts, for fixed stroke diaphragm pump. Push rod drive hydraulic oil on the diaphragm, continued exercise, stress in the diaphragm is too high, is easy to rupture. In order to ensure the pump bearing surface, after before the start of the diaphragm in Germany, the company in the diaphragm pump models for GFMZS add an auxiliary pump head pneumatic valve ( Figure the pneumatic valve installed on the shell of the hydraulic chamber. Below the MPa air into the secondary pneumatic valve piston, piston to overcome the spring force upward movement, top tee pneumatic valve connected between the hydraulic chamber and the hydraulic oil tank. Pump body after liquid, by measuring the pressure of the fluid in cab drive diaphragm backward movement, after making the diaphragm in the bearing surface, locate the diaphragm. At the same time, through auxiliary pneumatic valve, hydraulic chamber of hydraulic oil back into the hydraulic tank.
and start the auxiliary function. The operation order is: the pump body fluid, the auxiliary pneumatic valve besides have the effect of the diaphragm position. Auxiliary pneumatic valve to open the electromagnetic transmission, pneumatic valve, diaphragm, diaphragm pump is allowed after the start, the diaphragm pump starts, auxiliary pneumatic valve closed. In this way, the auxiliary under the condition of pneumatic valve is not closed to start the pump, diaphragm pump light starts, reduced the starting torque. After loading. Diaphragm pump after adding auxiliary pneumatic valve, to ensure the diaphragm is located in the bearing surface after when start the pump, make diaphragm force uniform, to prevent diaphragm rupture due to stress, effectively protect the diaphragm and diaphragm double service life. By adding auxiliary pneumatic valve, has realized the diaphragm pump low load startup, reduces the starting current, motor maintenance.

the diaphragm to double diaphragm with alarm:

high pressure measuring fluids will soon enter the hydraulic oil tank, if the diaphragm rupture. And damage the oil seal into gear reducer, consequence is very serious. In order to help identify the diaphragm rupture, the losses to a minimum, Germany, the company will be the diaphragm to double diaphragm with alarm. The diaphragm for ptfe plastic double diaphragm, two diaphragm attached together by hydraulic oil. Sandwich diaphragm is equipped with diaphragm of damage detection system, if there is a diaphragm rupture, or hydraulic fluid will enter the diaphragm metering fluid interlayer, pressure, pressure switch action, through the sensor signal to the central control room, issued a report to the police.

open test with discharge connection ( Figure if there are hydraulic oil discharge, when a report to the police. That close to the hydraulic chamber side of diaphragm rupture; If there is a measuring fluid discharge, the diaphragm rupture process side.