Internal meshing gear type: It consists of a pair of internally meshing gears and a pump body. When the driving gear drives the driven gear to rotate, at the suction port, the gear teeth gradually disengage from meshing, creating a space with an increasing volume, and the abrasive paste is sucked in. At the discharge port, the gear teeth gradually engage, the volume of the space decreases, and the abrasive paste is squeezed out, achieving the transportation.
Roots type: There are two or more Roots - type rotors in the pump. There is a certain gap between the rotors and between the rotor and the pump body, and they do not contact each other. When the rotors are driven by the driving device to rotate, on the inlet side, the space formed by the rotor and the pump body increases, and the abrasive paste is sucked in. On the outlet side, the space becomes smaller, and the abrasive paste is squeezed out.
Screw - type rotor pump: Relying on the rotation of the mutually meshing screw rotors, multiple sealed chambers are formed inside the pump casing. As the screws rotate, the sealed chambers move axially from the suction end to the discharge end, and the abrasive paste is axially pushed within the sealed chambers, thus realizing the transportation from the suction end to the discharge end.
Rotor: Usually made of high - strength and wear - resistant materials such as wear - resistant alloy steel and ceramics. The surface may be hardened or sprayed with a wear - resistant coating to resist the wear of abrasives.
Pump body: Made of strong and corrosion - resistant materials such as stainless steel and ductile iron. The internal flow channels are designed to be smooth to reduce the adhesion and accumulation of abrasive paste. At the same time, the wall thickness of the pump body is sufficient to withstand the pressure during transportation.
Sealing system: Generally, mechanical seals or packing seals are used. Mechanical seals have the advantages of good sealing performance, small leakage, and long service life; packing seals have the characteristics of simple structure, low cost, and convenient maintenance, and can be selected according to specific working conditions.
Driving device: Composed of a motor, a reducer, a coupling, etc., it provides power for the rotor. According to the transportation volume and pressure requirements, a motor with appropriate power and a reducer with appropriate reduction ratio can be selected. Variable - frequency motors are often used to achieve the speed - regulating function and precisely control the transportation volume.
