As far as piston pump is concerned, it refers to axial and radial piston pump. The piston pump is divided into axial piston pump and radial piston pump two representative structural forms, because the radial piston pump belongs to a new type of relatively high technical content of the efficient pump, with the continuous acceleration of domestic production, radial plunger pump is bound to become an important part of the field of application of the piston pump. The following piston pump manufacturers to a detailed introduction:

 

The oil pumping mechanism of the piston pump includes two sets of precise couplings: a plunger and a plunger sleeve constitute a plunger coupler, an oil valve and an oil valve seat constitute an oil valve coupler.

 

The plunger and the plunger sleeve are a pair of precision couplings, which cannot be exchanged after matching and grinding. They are required to have high precision, smooth finish and good abrasion resistance. The radial clearance is 0.002 ~ 0.003mm.

 

The cylinder face of the plunger head is cut with inclined groove, and communicated with the top through radial hole and axial hole, the purpose of which is to change the circulating oil supply; The plunger sleeve is equipped with inlet and outlet oil holes, which are connected with the low-pressure oil cavity in the pump body. After the plunger set is inserted into the upper body of the pump, positioning screws shall be applied for positioning.

 

The method of changing the oil supply varies with the position of the inclined groove of the plunger head.

 

The oil outlet valve and the oil outlet valve seat are also a pair of precision couplings, which cannot be exchanged after grinding. The mating clearance is 0.01mm.

 

Oil valve is a one-way valve, under the action of spring pressure, the valve upper conical surface and seat closely cooperate, its role is to stop the supply, the high-pressure oil pipe and plunger end cavity isolation, prevent the oil in the high-pressure oil pipe into the injection pump.

 

The lower part of the oil valve has a cross section, which can guide and pass through diesel. There is a small cylinder under the cone surface of the oil valve, called the pressure relief ring belt, its role is in the end of the oil supply, so that the oil pressure in the high-pressure tubing rapidly drops, to avoid oil dripping at the nozzle hole. When the belt falls into the seat seat, the upper volume will increase rapidly, the pressure will decrease rapidly, and the injection will stop quickly.

 

The above is the plunger pump manufacturer ZF hydraulic share with you two representative structural forms, do you understand? Hope to be able to provide more help for you to understand the plunger pump.

The above:ZF hydraulic axial piston pump manufacturer compare axial and radial piston pump greatly different