The Structure Principle of the Diaphragm Metering Pumps

Ⅰ. Introduction of diaphragm metering pumps

The diaphragm metering pump of NEWDOSE makes its operation safer and more reliable by adding auxiliary valves and adopting double diaphragms with alarms. However, it comes with disadvantages. The diaphragms of diaphragm metering pumps are easy to break, especially the fixed stroke diaphragm metering pumps. Once its diaphragms break, the metering fluid and the hydraulic oil system will pollute each other and cause damage, which will bring severe consequences. Let's take a look at the structure principle of the diaphragm metering pumps.

Ⅱ. The structural principle of the diaphragm metering pumps

A NEWDOSE diaphragm metering pump is composed of motor, drive mechanism, and pump head. The rotation generated by the motor will become the reciprocating motion of the worm gear through gearing, thereby completing the working process of suction and discharge. Adjust tappet motion by turning the regulating handwheels, and achieve the purpose of flow changing by changing the telescopic distance of diaphragms. The mechanical pump of NEWDOSE has the features of no leakage, high precision of measurement, and low noise, and it's used broadly in the industries of oil, chemical, pharmacy, textile, and so on.

Because of the isolating effect of the diaphragms, electric diaphragm metering pump structurally achieves the actual isolation between the measured fluid and the drive lubrication mechanism. The high-tech structural design and the selection of new materials have greatly increased the service life of the diaphragm, coupled with the excellent corrosion resistance of PTFE (Teflon), diaphragm metering pumps now become the main type of pump in fluid metering applications.

The mechanical metering pump of NEWDOSE uses damping stroke slide bars, which not only keep the advantages of traditional spring reset metering pumps, such as the simple structure, fewer faults, and easy maintenance, but also overcome the fatal weakness caused by the invalid eccentric travel, such as the big pipeline impact, high mechanical vibration, broken materials, flow linearity difference, loud noise, and so on.

Ⅲ. Advantages of mechanical diaphragm metering pumps:

1. Low cost

2. No dynamic seal, no leakage

3. Able to transport high viscosity medium, abrasive slurry, and hazardous chemicals

4. High tolerance of the PTFE diaphragms

5. The maximum outlet pressure is 3MPa, and the maximum flow range is 6,000 litres per hour; The accuracy of measurements is ± 5%, and the variation of flow can be as much as 10% when the pressure goes from minimum to maximum.