German MICHEL pump MICHEL model MICHEL price

MICHEL pump is a typical positive displacement hydraulic machine, driven by a prime mover, converting input mechanical energy into pressure energy of the liquid, 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 heavy loaders.

MICHEL pump classification

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

MICHEL pump mechanical principle

The total reciprocating stroke L of the piston pump plunger is constant and 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 the supply stroke. Rotating the plunger changes the end of fuel supply, thereby altering the fuel supply volume. When the piston pump operates, the cam on the fuel 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, creating a vacuum in the space above 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 the helical 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 helical 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, starting the next cycle. The piston pump is described here using a single plunger as an example. A piston 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 and drawing liquid into the cylinder. When the plunger moves in the other direction, the liquid is compressed, opening the other check valve and discharging the liquid drawn into the cylinder. This continuous operation forms continuous oil supply.

MICHEL 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 barrel 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 barrel, block the oil inlet at the top and side of the plunger with two fingers, and 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, gently press the delivery valve downward with another finger, and if it automatically springs back to its original position when the finger is released 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 0～0.03mm; 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 0.02～0.08mm; if it exceeds 0.12mm, the control sleeve must be replaced.

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