What Is a Metering Pump?

The fixed displacement pump is a variable displacement pump with a constant output speed, and the fixed displacement pump is the opposite. The biggest difference is that the shaft of the variable displacement pump is eccentrically mounted. Simply put, after the speed of the fixed-rate pump is selected, its flow cannot be adjusted. The output flow of the variable pump can automatically adjust the flow according to the pressure change of the system (the size of the external load), that is, the output flow is small when the pressure is high, and the output flow is large when the pressure is low. Oil circuit system, and can reduce oil heat. The disadvantage is that the flow pulsation is serious, the system pressure is not stable, the life of the pump is short, and the bearing of the pump is easy to break because it is eccentrically installed and the noise of the pump is loud.

1.Self-designed quantitative pump

The invention relates to the technical field of quantitative pumps, in particular to a differential quantitative pump, including a PLC control device, a pressure fluid pipeline and a control device thereof. A pump body, a feeding side end cap on a feeding side of the pump body, and a pump body are discharged. The discharge side end cap on the material side, the active piston in the pump body connected to this feed side end cap, the differential sleeve abutting on this active piston, the feed port and discharge connected to this active piston The mouth is composed of a lateral connecting rod connecting the feeding side end cover and the discharging side end cover. The active piston is equipped with two sealing rings. There are two inside and outside of the differential sleeve

in

Using the back and forth movement of the diaphragm to change the diaphragm and the pump head causes the ball valve to move up and down

From the above operating principles, we can simply know that any of the factors such as the diaphragm, the pump head, and the ball valve and the ball seat are unable to achieve the purpose of conveying due to air leakage, or the flow rate is abnormal. Generally, the four main faults that constitute the main cause are:

Ball seat and ball valve cannot be airtight

Foreign objects at the entrance and exit are blocked

Damaged diaphragm

Therefore, if the liquid transportation is abnormal, handling it in this direction should be able to solve it. The factors that cause the above situation are too numerous to list, and it can be determined based on the piping, accessories and operating conditions at the time. ^[2]

Dosing pump is used in magnesium alloy melting / insulation furnace. It can supply dosing magnesium alloy solution for die casting.