The metering pump is mainly composed of three parts: power drive, fluid transport and regulation control. The power drive device drives the fluid transport diaphragm to achieve reciprocating motion through the mechanical link system:
The diaphragm (piston) will be sucked in during the first half of the stroke and drained out of the pump head during the second half of the stroke; Therefore, the purpose of adjusting fluid throughput can be achieved by changing the reciprocating motion frequency of the stroke or the stroke length of each reciprocating motion. Precision machining precision to ensure the output of each pump to achieve the precision measurement of the medium to be delivered.
Because of its different power drive and fluid delivery, metering pumps can be roughly divided into two types of plunger and diaphragm.
1. Plunger metering pump
There are two kinds of valve pump and valve pump. Plunger metering pump is widely used in petrochemical industry because of its simple structure and high temperature and pressure resistance. In view of the shortage of ordinary plunger pump with high viscosity medium under high pressure working condition, a valveless rotary plunger metering pump has been paid more and more attention, and is widely used for metering and adding high viscosity medium such as syrup, chocolate and petroleum additives. Due to the structural shortcoming of the complete isolation between the measured medium and the lubricant in the pump, the plunger metering pump is subject to many limitations in the application of fluid metering with high pollution prevention requirements. The world's most professional hose pump manufacturers, with many engineers at home and abroad to develop together to create the best quality hose pump manufacturers
2. Diaphragm metering pump
As the name suggests, diaphragm metering pump USES a specially designed and processed flexible diaphragm to replace the piston, which realizes reciprocating movement under the action of the driving mechanism to complete the suction and discharge process. Due to the isolation of the diaphragm, the separation between the metering fluid and the drive lubrication mechanism is realized in structure. High-tech structure design and new material selection has greatly improved the service life of the diaphragm, coupled with the excellent corrosion resistance of composite materials, diaphragm metering pump has become the main pump type in fluid metering applications. In the diaphragm metering pump family members, hydraulic driven diaphragm pump due to the use of oil to drive the diaphragm evenly, overcome the mechanical direct drive under the pump diaphragm force is too concentrated shortcomings, improve the diaphragm life and working pressure ceiling. In order to overcome the possible failure of single diaphragm metering pump caused by diaphragm breakage, some metering pumps are equipped with diaphragm breakage to realize automatic chain protection when diaphragm is broken. The metering of pump head with double diaphragm structure further improves its safety and is suitable for applications especially sensitive to safety protection.
As a diaphragm metering pump, electromagnetic drive metering pump with electromagnet pulsating driving force, the motor and variable speed mechanism, make the system compact and compact, is an important branch of low voltage metering pump of small range.