How does a piston metering pump work?

The piston metering pump directly sucks and discharges the working medium (yellow) through the reciprocating motion of the plunger. Since both the plunger and the seal are in contact with the medium, choosing the right plunger material and seal type ensures that the pump performs optimally during operation. There are two types of piston metering pumps: valved pumps and valveless pumps.

Piston metering pumps are widely used in the petrochemical industry because of their simple structure and high temperature and high pressure resistance. The plunger is made of stainless steel and oxide ceramics, which have the characteristics of corrosion resistance and high hardness and wear resistance. In view of the shortcomings of ordinary piston pumps for high-viscosity media under high pressure conditions, a valve-free rotary piston metering pump has received more and more attention, and is widely used in the metering and addition of high-viscosity media such as syrup, chocolate and petroleum additives.

Due to the structural disadvantage of not being able to achieve complete isolation between the medium being metered and the lubricant inside the pump, piston metering pumps are limited in fluid metering applications with high contamination requirements. Piston metering pumps are used to accurately dose liquids that do not contain solid particles into pressurized or atmospheric vessels and pipelines. Different types of piston metering pumps can be equipped with variable frequency motors (able to receive 4-20mA current signals) or explosion-proof motors according to the requirements.

The piston pump head has a simple structure, economy and high measurement accuracy, and needs to be selected and maintained well. Automatic lateral alignment between plunger and seal ensures low wear between the two. SJ1-S Piston Metering Pump Parameter Characteristics:

Large flow rate of single head: 50,000 liters per hour; Very high discharge pressure: 50MPa; Steady-state accuracy 1%; Media viscosity:

0-800 mm2 s; The temperature of the conveying medium reaches more than 450 °C. More product introduction and ** requirements for metering pumps,Other instruments are solenoid valves, spectrophotometers, etc.

The working principle of the axial piston pump is finally understood after reading it.

The working principle of the piston pump: the piston pump is to make reciprocating motion in the cylinder through the plunger rod, so as to produce a pressure difference to input the fluid. Its advantages are mainly that it has a wide range of applications and can output high-pressure media; The main disadvantages are that the structure is more complex, the amount of maintenance is large, the vibration is large during operation, the noise is large, and there are many wearing parts.

Piston pumps are available in single-cylinder and multi-cylinder versions, with different structures.

The structural form of the piston pump:Piston pumps are divided into two representative structural forms: axial piston pumps and radial piston pumps; Since the radial piston pump is a new type of high-efficiency pump with relatively high technical content, with the continuous acceleration of localization, the radial piston pump will inevitably become an important part of the piston pump application field; A radial piston pump is a piston pump in which the reciprocating direction of motion of the piston or plunger is perpendicular to the drive shaft.

The working principle of the radial piston pump: the driving torque is transmitted by the drive shaft to the star-shaped hydraulic cylinder rotor through the cross coupling, and the stator is not subject to other transverse forces. The rotor is mounted on the distribution shaft.

The radially arranged plunger in the rotor is pressed against the eccentric stroke stator by means of a hydrostatically balanced sliding shoe.

Piston pumps work by means of hydraulic force to transfer fluid from one place to another. It controls the flow of the liquid through a slider and a piston. When the piston is lowered, the liquid is pumped out, and when the piston is raised, the liquid is pressed in.

The working principle of the piston pump is:Piston pump is a kind of reciprocating pump, which belongs to the volume pump, and its plunger is driven by the eccentric rotation of the pump shaft, reciprocating motion, and its suction and discharge valves are one-way valves.

When the plunger is pulled out, the pressure in the working chamber decreases, the outlet valve is closed, and when the pressure is lower than the inlet, the inlet valve opens and the liquid enters; When the plunger pushes inward, the chamber pressure rises and the inlet valve closes, and when the outlet pressure is higher than the outlet, the outlet valve opens and the liquid is discharged. When the transmission shaft drives the cylinder to rotate, the swash plate pulls or pushes the plunger back from the cylinder to complete the suction and discharge process.

The oil in the working chamber composed of plunger and cylinder bore communicates with the suction and discharge chambers of the pump respectively through the oil distribution pan. The variable mechanism is used to change the inclination angle of the swash plate, and the displacement of the pump can be changed by adjusting the inclination angle of the swash plate.

Piston pump is a type of reciprocating pump, which belongs to positive displacement pump. The rotational motion of the motor is transformed into the reciprocating motion of the plunger by means of an eccentric wheel and a crosshead slide mechanism.

When the plunger is pulled back, the volume of the closed cavity formed by the inlet check valve, the outlet check valve and the plunger increases, the pressure decreases, the outlet valve is closed, the inlet valve is opened, and the liquid enters the cavity; When the plunger is pushed forward, the volume of the closed cavity formed by the inlet check valve, the outlet check valve and the plunger decreases, the chamber pressure rises, the inlet valve closes, and when the pressure is higher than the outlet pipeline, the outlet valve opens and the liquid is discharged. In this way, as the plunger reciprocates, the liquid continues to enter the outlet pipe from the inlet pipe through the plunger pump.

A piston pump is a type of pump that uses the reciprocating motion of a screw or piston to increase the pressure of a liquid. It works by such that when the piston moves, the liquid is carried into the piston chamber, at which point the pressure rises, allowing the liquid to flow to the next cycle. With the movement of the piston, the continuous cyclic movement of the liquid can be realized, and a certain pressure is generated at the outlet to realize the lifting and pressurization of the liquid.

The total stroke l of the reciprocating motion of the plunger pump is constant and is determined by the lift of the cam. The amount of oil supplied to the plunger per cycle depends on the oil supply stroke, which is variable regardless of camshaft control.

The start time of the oil supply does not change with the change of the oil supply stroke. Turning the plunger changes the end of the supply time, thus changing the amount of oil supplied.

When the piston pump is working, under the action of the cam and plunger spring on the camshaft of the fuel injection pump, the plunger is forced to reciprocate up and down, so as to complete the task of pumping oil into the trapped skin, and this working mode forms a continuous oil supply after continuous movement.