German Pierburg pump Pierburg model Pierburg price

Pierburg pump is a typical positive displacement hydraulic machine, driven by a prime mover, converting input mechanical energy into liquid pressure energy, and then inputting it into the system in the form of pressure and flow. It is the power source of the hydraulic system. Since it can transport liquids under high pressure, it is widely used in various industries in industrial production and daily life, such as water conservancy, construction, and energy. In addition, it is also widely used in shipbuilding, oil extraction, and loaders.

Pierburg pump classification

Plunger pumps are generally divided into single plunger pumps, horizontal plunger pumps, axial plunger pumps, and radial plunger pumps. 1) Single plunger pump: The structure mainly consists of an eccentric wheel, plunger, spring, cylinder body, and two check valves. A sealed volume is formed between the plunger and the cylinder bore. One rotation of the eccentric wheel causes the plunger to reciprocate once; downward motion draws in oil, and upward motion discharges oil. The volume of oil discharged per revolution of the pump is called the displacement, which depends only on the structural parameters of the pump. 2) Horizontal plunger pump: Horizontal plunger pumps have several plungers (generally 3 or 6) installed in parallel. One 1 crankshaft drives the plungers to reciprocate via connecting rod sliders or directly via an eccentric shaft, achieving suction and discharge of liquid. They all use valve-type distribution devices, and most are fixed-displacement pumps. Emulsion pumps in coal mine hydraulic support systems are generally horizontal plunger pumps. Emulsion pumps are used at coal mining faces to provide emulsion for hydraulic supports. The working principle relies on the rotation of the crankshaft to drive the Piston to reciprocate, achieving liquid suction and discharge. 3) Axial type: Axial plunger pump (English name: Piston pump) is a plunger pump where the reciprocating motion direction of the piston or plunger is parallel to the central axis of the cylinder block. Axial plunger pumps operate by utilizing the volume change generated by the reciprocating motion of plungers parallel to the drive shaft within the plunger bores. Since both the plunger and the plunger bore are circular components, they can achieve high-precision mating, resulting in high volumetric efficiency. 4) Straight-axis swashplate type: Straight-axis swashplate plunger pumps are divided into pressure-supply type and self-priming type. Pressure-supply hydraulic pumps mostly use pressurized tanks. For hydraulic tanks relying on air pressure for supply, the machine must only be operated after the hydraulic tank reaches the required operating pressure following each startup. If the machine is started when the air pressure in the hydraulic tank is insufficient, it will cause the slipper shoes inside the hydraulic pump to detach, leading to abnormal wear between the return plate and the pressure plate inside the pump body. 5) Radial type: Radial plunger pumps can be divided into two categories: valve distribution and shaft distribution. Valve-distribution radial plunger pumps have disadvantages such as high failure rates and low efficiency. Shaft-distribution radial plunger pumps developed in the 70s and 80s internationally overcame the shortcomings of valve-distribution radial plunger pumps. Due to the structural characteristics of radial pumps, shaft-distribution radial plunger pumps are more impact-resistant, have longer service lives, and offer higher control precision than axial plunger pumps. For pumps with short variable strokes, displacement variation is achieved by changing the eccentricity of the stator under the action of the variable plunger and limit plunger. The maximum eccentricity of the stator is 5–9mm (depending on the displacement size), and the variable stroke is very short. Moreover, the variable mechanism is designed for high-pressure operation and controlled by a control valve, resulting in fast response speed. The radial design overcomes problems such as uneven wear of slipper shoes in axial plunger pumps, significantly improving impact resistance. 6) Hydraulic type: Hydraulic plunger pumps rely on pressurized hydraulic tanks. After each machine startup, operation must wait until the hydraulic tank reaches the required operating pressure. Straight-axis swashplate plunger pumps are divided into pressure-supply type and self-priming type. Pressure-supply hydraulic pumps mostly use pressurized tanks, while some hydraulic pumps have built-in boost pumps to supply pressure oil to the inlet. Self-priming hydraulic pumps have strong self-priming capabilities and do not require external oil supply.

Pierburg pump mechanical principle

The total reciprocating stroke L of the plunger pump plunger is constant, determined by the cam lift. The fuel supply volume per cycle depends on the supply stroke, which is variable and not controlled by the camshaft. The start of fuel supply does not change with variations in the supply stroke. Rotating the plunger changes the end of fuel supply timing, thereby altering the fuel supply volume. When the plunger pump operates, the cam on the injection pump camshaft and the plunger spring force the plunger to reciprocate up and down, completing the pumping task. The pumping process can be divided into the following two stages. 1) Intake process: After the cam lobe rotates past, the plunger moves downward under spring force. A vacuum is created in the upper space of the plunger (called the pump chamber). When the upper end face of the plunger opens the intake port on the plunger sleeve, diesel fuel filling the oil passage in the upper body of the oil pump enters the pump chamber through the oil port. The intake ends when the plunger reaches bottom dead center. 2) Return process: The plunger supplies oil upward. When it moves up to the point where the helix groove (cut-off edge) on the plunger aligns with the return port on the sleeve, the low-pressure oil circuit in the pump chamber communicates with the central hole, radial hole, and helix groove at the plunger head. Oil pressure drops sharply, and the delivery valve closes rapidly under spring force, stopping oil supply. The plunger continues to move upward. After the cam lobe rotates past, the plunger moves downward again under spring action. This begins the next cycle. The plunger pump is described here using a single plunger as an example. A plunger pump has two check valves with opposite directions. When the plunger moves in one direction, negative pressure occurs in the cylinder, opening one check valve to draw liquid into the cylinder. When the plunger moves in the other direction, the liquid is compressed, opening the other check valve to discharge the liquid drawn into the cylinder. This continuous operation forms continuous oil supply.

Pierburg pump maintenance

(1) Inspect the plunger for scratches and corrosion; replace with a new part if necessary. (2) Check the mating condition of the plunger assembly. Insert the plunger end into the plunger sleeve and tilt it by approximately 60°; if the plunger slides down slowly under its own weight, the mating is good. (3) Check the sealing of the plunger assembly. Hold the plunger sleeve with one hand, and use two fingers to block the oil inlet at the top and side of the plunger. Pull out the plunger with the other hand; significant suction felt, and the plunger immediately retracting to its original position upon release, indicates good sealing of the plunger assembly; otherwise, replace the plunger assembly. (4) Inspect the decompression band of the delivery valve assembly for wear, steps, or scratches; replace if necessary. (5) Check the mating condition of the delivery valve assembly. Block the lower hole of the delivery valve with one finger, and gently press the delivery valve downward with another finger. If it automatically springs back to its original position when the finger is removed from the top of the delivery valve, the sealing of the delivery valve assembly is good; otherwise, replace the delivery valve assembly. (6) Inspect the tappet body. The standard clearance between the injection pump body and the tappet body is 0 to 0.03mm; if it exceeds 0.2mm, replace the parts. (7) Check the clearance between the plunger flange and the groove of the control sleeve, which should be 0.02 to 0.08mm; if it exceeds 0.12mm, the control sleeve must be replaced.

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