Metering pump overview
As everyone knows, the metering pump driven by power, control and regulation of fluid is composed of three parts. As shown in figure. Power driving device via a mechanical linkage system drives the fluid delivery diaphragm ( piston ): reciprocating diaphragm ( piston ) in stroke during the first half of the week will be transmission fluid-week inhalation and the second half of the week will fluid from pump head; so, change the stroke of the reciprocating motion frequency or every reciprocating stroke length can reach to the purpose of regulating fluid conveying capacity. Precision machining accuracy to ensure that the volume of each pump to achieve by the precision measurement of transmission medium.
Because of its drive and fluid transport mode, the metering pump can be broadly divided into the plunger and the two types of diaphragm.
2.1 plunger type metering pump
The main general valve pump and valve pump two. Plunger type metering pump because of its simple structure and high temperature high pressure has been widely used in petrochemical industry. In view of high viscosity medium under high pressure conditions common plunger pump, a valve rotary plunger type metering pump has been receiving more and more attention, is widely used in the syrup, chocolate and oil additives and other high viscosity medium metering addition. Because the measurement of medium and pump lubricant between the inability to achieve complete isolation of the structural weaknesses, the plunger type metering pump in high pollution requirements fluid metering applications subject to many restrictions.