The pumping mechanism of the plunger pump includes two sets of precision parts.
The pumping mechanism of the plunger pump includes two sets of precision parts. As follows, Dalan Hydraulics will tell you:
1. The plunger and the plunger sleeve constitute a plunger coupler;
1Plunger and plunger sleeve are a pair of precision parts. They can not be interchanged after paired grinding. It requires high precision and smoothness and good wear resistance. The radial clearance is 0.002~0.003mm.
2 The cylindrical surface of the plunger head is cut with a chute, and communicates with the top through the radial hole and the axial hole. The purpose is to change the circulating oil supply; the plunger sleeve is provided with inlet and return oil holes, and the pump The upper and lower low pressure oil chambers are connected, and the plunger is placed in the upper body of the pump, and the positioning screw is used for positioning.
2. The oil outlet valve and the oil outlet valve seat constitute the oil valve coupler.
According to the structure of the plunger pump, it can be divided into an axial piston pump and a radial piston pump.
1. An axial piston pump is a plunger pump in which the reciprocating direction of the piston or plunger is parallel to the central axis of the cylinder.
An axial piston pump operates with a volume change caused by a reciprocating motion of a plunger parallel to the drive shaft within the plunger bore.
2 Since the plunger and the plunger hole are both round parts, high precision can be achieved during processing, so the volumetric efficiency is high, the operation is stable, the flow uniformity is good, the noise is low, the working pressure is high, etc., but the hydraulic oil is The pollution is more sensitive, the structure is more complicated, and the cost is higher.
3 axial piston pumps are mainly divided into the following categories:
a, quantitative plunger pump MCY14-1B
b, manual variable displacement piston pump SCY14-1B
c, pressure variable plunger pump YCY14-1B
d, electro-hydraulic control plunger pump BCY14-1B
e, constant pressure variable displacement piston pump PCY14-1B
2. The radial piston pump can be divided into two categories: valve distribution and shaft distribution.
The 1 valve distribution radial piston pump has the disadvantages of high failure rate and low efficiency.
The 2-axis radial piston pump overcomes the shortcomings of the valve-distributing radial piston pump.
3 Due to the characteristics of the radial pump structure, the axial-distribution radial piston pump is more resistant to impact, longer life and higher control precision than the axial piston pump.
The variable of the 4 variable stroke short pump is realized by changing the eccentricity of the stator under the action of the variable plunger and the limit plunger, and the maximum eccentricity is set to 5-9mm (depending on the displacement), the variable stroke is very short. And the variable mechanism is designed for high pressure operation and is controlled by a control valve. Therefore, the pump responds quickly.
5 radial structure design overcomes the problem of eccentric wear of axial piston pump shoes. Its impact resistance is greatly improved.
3, straight shaft swash plate piston pump
Straight-axis swash plate type piston pumps are divided into two types: self-priming oil type with pressure supply type.
1 Pressure oil supply type hydraulic pumps mostly use a gas tank with air pressure, and the hydraulic pump itself has a charge pump to supply pressure oil to the oil pump inlet.
2 Self-priming hydraulic pump has strong self-priming ability and requires no external force to supply oil. For self-priming piston pumps, the oil in the hydraulic tank should not be lower than the lower limit of the oil mark, and a sufficient amount of hydraulic oil should be maintained. The higher the cleanliness of the hydraulic fluid, the longer the service life of the hydraulic pump.
4, hydraulic piston pump
The hydraulic piston pump relies on the pneumatic oil supply tank. After each start of the machine, the machine must be operated after the hydraulic stain box reaches the air pressure. If the pressure of the hydraulic oil tank is insufficient, it will cause the machine to pull off the slippery whip in the hydraulic pump, which will cause abnormal wear of the return plate and the pressure plate in the pump body.
----- Editor-in-Chief: Dalan Oil Pump Motor 02-Procurement Consultant
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