Plunger type metering pump is an important device of hydraulic system. It relies on the plunger in the cylinder body reciprocating movement so that the volume of the sealing work volume changes to achieve oil absorption, pressure oil. Plunger pump with high rated pressure, compact structure, high efficiency and convenient flow adjustment, is widely used in high-pressure, Large flow and flow needs to be adjusted for occasions such as hydraulic presses, engineering machinery and ships. The plunger type metering pump belongs to the volume pump, its plunger depends on the eccentric rotation of the pump shaft to drive the reciprocating motion, and its suction and discharge valves are all check valves. When the column is pulling out of the work chamber pressure lower, Plunger-type Metering Pump exit valve closed below the inlet pressure, the inlet valve open liquid entry; Outlet valve open liquid discharge above outlet pressure. When the drive shaft drives the cylinder body to rotate, the diagonal plate pulls the plunger out of the cylinder or pushes back to complete the suction and discharge process. The oil in the working cavity composed of plunger and cylinder bore is respectively sucked with the pump by the oil distribution plate The oil-discharging cavity is communicated with each other. Plunger-type Metering Pump The variable mechanism is used to change the inclination of the inclined plate to change the pump displacement by adjusting the tilt angle. Plunger type Metering pump structure: Plunger type metering pump is divided into axial plunger pump and radial plunger pump two representative structural forms; Because the radial plunger pump belongs to a new type of high efficiency pump with high technical content, Plunger-type Metering Pump With the constant acceleration of the radial piston pump will become an important part of the application of plunger pump
Plunger type metering pump is widely used in petrochemical industry because of its simple structure and high temperature and high pressure. The plunger material has stainless steel, oxidized ceramic, the oxidation ceramics has the corrosion resistance and the hardness high wear-resisting characteristic. Plunger-type Metering Pump Aiming at the shortage of common plunger pump in high viscosity medium under high pressure condition, a kind of valveless rotary plunger metering pump has been paid more and more attention, Plunger-type Metering Pump which is widely used in the measurement of high viscosity medium such as syrup, chocolate and petroleum additive.
Principle of plunger type metering pump
The plunger type metering pump directly inhales and discharges the working medium (yellow) by reciprocating movement of the plunger. As the plunger and seal are in contact with the media, choosing the proper plunger material and sealing form can guarantee the ideal performance during the operation of the pump.
Plunger-type metering pump is a reciprocating pump, belongs to the volume pump, its plunger by the eccentric rotation of the pump shaft drive, reciprocating movement, its suction and discharge valves are one-way valve. When the pillar is pulled, the working room pressure is lowered, Plunger-type Metering Pump the exit valve is closed, the inlet valve is open and the liquid enters when the inlet pressure is lower, the pressure of the chamber is increased, the inlet valve is closed, and the outlet valve is opened and the liquid is discharged when the plunger is pushed inside. Plunger-type Metering Pump When the drive shaft drives the cylinder body to rotate, the inclined plate pulls the plunger from the cylinder body and pushes it back to complete the suction and discharge process. The oil in the working capacity cavity composed of plunger and cylinder bore is communicated with the pump suction and oil discharge chamber respectively. The variable mechanism is used to change the inclination of the inclined plate, Plunger-type Metering Pump and the displacement of the pump can be changed by adjusting the inclination angle.
The plunger-type metering pump is used to accurately and quantitatively transport liquids without solids in pressurized or atmospheric pressure vessels and pipelines. Different types of plunger metering pump can be assembled according to the requirements of the inverter motor (can receive 4-20ma current signal) or explosion-proof motor. The plunger pump head is simple in structure, economical and high in measurement precision, Plunger-type Metering Pump so it needs to choose and maintain a good seal. The lateral automatic alignment between the plunger and the seal ensures a small wear between the two.
1. Oil injection process
When the convex part of the cam is turned over, the plunger moves downward under the action of the spring force, and the plunger space (called the Pump Oil Chamber) produces the vacuum degree, when the plunger upper surface of the plunger sleeve on the opening of the oil hole, Plunger-type Metering Pump filled in the oil pump tank in the fuel through the oil hole into the pump oil chamber, plunger movement to the next stop point, the end of the oil.
2. Oil supply process
When the camshaft goes to the convex part of the cam to top the roller body, the plunger spring is compressed, the plunger moves upward, the fuel is pressed, and a part of the fuel oil is flowed back into the fuel injection pump. When the top edge of the plunger is shielded from the upper rim of the sleeve, Plunger-type Metering Pump the coordination gap between the plunger and the sleeve is very small (0). 0015-0.0025mm) make the pump oil chamber at the top of the plunger a sealed oil cavity, the plunger continues to rise, the oil pressure in the pump chamber rises rapidly, the pump oil Press is the spring force of the valve and the residual pressure of the high-pressure tubing, Push out the valve, Plunger-type Metering Pump high-pressure diesel oil through the oil valve into the high-pressure tubing, through the injector into the combustion chamber.
3. Oil return process
The plunger is supplied upward, and when the chute (off edge) upstream to the plunger is communicated with the return hole on the sleeve, pump oil chamber low pressure circuit and plunger head of the middle hole and radial hole and inclined trough communication, plunger-type metering pump oil pressure suddenly drop, Plunger-type Metering Pump the valve in the spring force under the action of rapid closure, stop the supply of oil. Since then the plunger also to uplink, when the convex part of the cam turned over, under the action of the spring, plunger and downlink. The next loop begins.
