According to the requirements of different occasions, it is very important to know the following information about how to choose a variety of metering pumps. Analysis of ALLDOS dosing metering pumps in the case of different water treatment selection 1) was measured the flow of liquid, the measurement accuracy requirements. 2) The main characteristics of the liquid to be measured, such as chemical corrosivity, viscosity, concentration and density. 3) System back pressure. 4) a suitable suction height. 5) Other options required, such as analog control, pulse control, flow monitoring and timer. 6) the environment of the equipment requirements. The types and features of metering pumps Metering pumps according to the structure of the hydraulic end points can be divided into hydraulic metering pumps and diaphragm metering pumps, hydraulic pumps are divided into ordinary valve pump and valveless pump two; Diaphragm Metering pumps are divided into mechanical diaphragm metering pumps, hydraulic diaphragm metering pumps and digital metering pumps. Metering pump according to the form of driving points, but also can be divided into electromagnetic driven metering pump and motor driven metering pump, in addition, there are hydraulic drive, pneumatic drive metering pump form. 1) hydraulic metering pump: hydraulic metering pump is divided into two kinds of valve pump and valveless pump. Column hydraulic metering pump because of its simple structure and high temperature and pressure and other advantages have been widely used in the field of petrochemicals. Aiming at the shortage of high-pressure medium under the condition of high pressure, a kind of valveless rotary hydraulic metering pump receives more and more attention and is widely used in the metering of high viscosity medium such as syrup, chocolate and petroleum additive Add to. Due to the structural disadvantage of being unable to achieve complete isolation between the metering medium and the pump lubricant, the plunger metering pump suffers from a number of limitations in high contamination containment requirements for fluid delivery metering applications. 2) ALLDOS Diaphragm Metering Pump: As the name implies, the diaphragm metering pump is the front end of the plunger plus a flexible diaphragm, due to the isolation of the diaphragm, the structure of the real delivery medium is no leakage. Ideal for corrosive media, solids-laden media delivery and high contamination protection requirements, the membrane's life expectancy has been greatly improved with the addition of high-tech structural designs and new materials, combined with excellent composite materials Corrosion resistance, diaphragm metering pump has now become the main pump fluid metering applications. In the diaphragm metering pump family members, there are mechanical diaphragm metering pumps, hydraulic diaphragm metering pumps and bellows metering pumps three. Mechanical diaphragm metering pump diaphragm is connected with the plunger mechanism, no hydraulic oil system, the piston moves back and forth directly before and after the diaphragm deflection. The hydraulic diaphragm metering pump drives the diaphragm evenly through the hydraulic oil to overcome the shortcomings of excessive stress concentration of the diaphragm in the mechanical direct drive mode and enhance the diaphragm life and upper limit of working pressure. In order to overcome the possible malfunction caused by diaphragm breakage in single diaphragm metering pump, some metering pumps are equipped with diaphragm breakage sensors to automatically interlock the diaphragm when the diaphragm ruptures; the metering pump with double diaphragm structure pump head further enhances its Safety, suitable for applications that are particularly sensitive to safety. Bellows metering pumps are similar to mechanical diaphragm metering pumps except that the bellows is used instead of the diaphragm and the end of the plunger is connected to the bellows. As the plunger reciprocates, the bellows are stretched and compressed, changing the cylinder Cavity volume, in order to achieve the purpose of infusion and measurement. 3) Digital metering pump: As the main metering pump metering pump, the power drive is the motor, the motor output torque through the deceleration mechanism deceleration, and then by the mechanical linkage system plunger or diaphragm reciprocating motion, so as to achieve being transported Fluid intake and discharge. Motorized pump drive end, usually by the deceleration mechanism, the adjustment mechanism and the crank connecting rod mechanism and other components. Deceleration mechanism: Generally adopt worm reduction mechanism, but also adopt cycloid reducer mechanism and deceleration bearings and other forms of deceleration. Sometimes, in order to achieve by changing the frequency of reciprocating motion to achieve the purpose of regulating the amount of fluid delivery, there are also a variety of structures using CVT to replace the deceleration structure. Crank and linkage mechanism and adjustment mechanism: Due to the metering pump power is relatively small, most of the stroke adjustment mechanism is arranged in the crank connecting rod mechanism, the most common eccentric slider adjustment mechanism, spring cam mechanism and change the worm gear tilt angle and change the connecting rod The structure of the fulcrum, these are by adjusting the length of the stroke to achieve the purpose of regulating fluid delivery volume. (Editor: Yunhai QQ:) Recommended reading: Acting procurement
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