A pump is a machine that converts energy. It converts the mechanical energy of prime mover (such as motor) into kinetic energy and potential energy of liquid to achieve the purpose of conveying and improving liquid.
Due to the variety of oil pump series, the classification method is also different, usually oil pump according to its working principle is divided into three types.
1: vane type oil pump
The liquid pumping of the vane pump is completed by the high-speed rotation of the vane impeller. According to the impeller water flow direction can be divided into the vane pump radial flow, axial flow and oblique flow three. Radial flow impeller oil pump is called centrifugal oil pump, liquid particle flow in the impeller is mainly affected by centrifugal force; The pump with axial flow impeller is called axial flow pump, liquid particle flow in the impeller is mainly affected by the action of axial lift; Oblique flow impeller pump known as mixed flow pump, it is the transition form of the two impeller, liquid particle flow in the impeller, both by centrifugal force, and by the role of axial lift.
2: positive displacement oil pump
The pressure of positive displacement oil pump to liquid is completed by the volume change of the oil pump internal studio. The general way to change the volume of the studio has two kinds of reciprocating movement and rotary movement. Belong to the reciprocating movement of positive displacement oil pump piston reciprocating pump, plunger reciprocating pump, etc.; Belongs to the rotary motion of the positive displacement pump rotor pump.
Schematic diagram of working principle of positive displacement oil pump is shown in Figure 12. As the piston pulls to the right, the chamber volume increases and the pressure decreases. The inlet valve is opened, the outlet valve is closed, and the water in the suction pool enters the studio through the inlet pipe under the action of atmospheric pressure; When the piston pushes to the left, the oil inlet valve is closed, the oil outlet valve is opened, and the water in the working chamber enters the pressure pipe, so the cycle continues to work.
图12
