The diaphragm pump uses compressed air, nitrogen or natural gas as power. The main directional (pneumatic) control valve distributes compressed air to the gas chamber and exerts uniform pressure on the inner surface of the diaphragm. At the same time, the discharged gas is discharged from the other side of the pump rear through the valve assembly guide port.
The gas pressure in the diaphragm pump chamber exceeds the pressure in the liquid chamber. The diaphragm connecting rod moves back and forth, discharging on one side and inhaling on the other side. The direction of discharge and suction is controlled by the direction of the check valve (ball valve or sheet valve), and the suction stroke enables the pump to perform suction. Suction stroke can reduce cabin pressure, increase chamber volume, thereby generating atmospheric pressure differential, push liquid through the suction pipe, through the suction side check valve, into the external liquid chamber. Diaphragm pump suction side stroke can also start the reciprocating (displacement, stroke or cycle) movement of the pump.
Diaphragm pump through the travel mechanical pull suction diaphragm moving pneumatic double diaphragm pump inner plate and alignment of the driving plunger contact, mobile guide valve, guide valve activated, then to the main directional valve at the other end of the pressure signal, pneumatic double diaphragm pump to the direction of compressed air to the other side of the internal chamber so repeated motion to complete the continuous transmission of the medium, there are four materials: Plastic, aluminum, cast iron, stainless steel. Diaphragm pump according to different liquid media are made of butadiene rubber, neoprene rubber, fluorine rubber, PTFE, polytetrafluoroethylene. To meet the needs of different users. Placed in a variety of special occasions, used to pump a kind of conventional pump can not be pumped medium, have achieved satisfactory results.
Diaphragm pump has the above characteristics, so in the world diaphragm pump since its birth is gradually invading the market of other pumps, and occupy a part of it. For example: spray painting, ceramics industry diaphragm pump has occupied the dominant position, and in some other industries, such as environmental protection, wastewater treatment, construction, sewage, fine chemical industry is expanding its market share, and has the irreplaceable status of other pumps. The advantages of pneumatic diaphragm pump are:
1, due to the use of air for power, so the flow with the change of back pressure (outlet resistance) and automatic adjustment, suitable for high viscosity fluid. The working point of the diaphragm pump is set on the basis of water. If it is used for the fluid with slightly higher viscosity, it needs to support the reducer or frequency conversion governor. The cost is greatly increased, and the same is true for the gear pump.
2, in the inflammable and explosive environment with pneumatic pump reliable and low cost, because:, after grounding can not produce sparks; Second, no heat generation in the work, the machine will not overheat; Third, the fluid will not overheat because the diaphragm pump on the fluid agitation is small.
