German hydromat pump hydromat model hydromat price

hydromat 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 loaders.

hydromat 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 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. A 1 crankshaft drives the plungers to reciprocate via connecting rod sliders or directly via an eccentric shaft, realizing a hydraulic pump for suction and discharge of liquids. 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 Piston pump (English name: Piston pump) are plunger pumps 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 parts, they can achieve very high precision fit, 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, after each machine start-up, operation can only begin after the hydraulic tank reaches the required operating pressure. If the machine is started when the air pressure in the hydraulic tank is insufficient, it 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 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 life, and 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 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 wear of slipper shoes in axial plunger pumps, significantly improving impact resistance. 6) Hydraulic type: Hydraulic plunger pumps rely on pressurized tanks for oil supply. After each machine start-up, operation can only begin after 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 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.

hydromat pump mechanical principle

The total reciprocating stroke L of the plunger pump plunger is constant, determined by the cam lift. The fuel supply quantity per cycle depends on the supply stroke, which is variable and not controlled by the camshaft. The start moment of fuel supply does not change with the supply stroke. Rotating the plunger changes the end moment of fuel supply, thereby changing the fuel supply quantity. When the plunger 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 convex part of the cam rotates past, under the force of the spring, the plunger moves downward, 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 it moves up to the point where 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 suddenly, and the delivery valve closes rapidly under the spring force, stopping oil supply. The plunger continues to move upward. After the convex part of the cam rotates past, the plunger moves downward again under the 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 and drawing liquid into the cylinder. When the plunger moves in the other direction, the liquid is compressed, opening the other check valve, and the liquid drawn into the cylinder is discharged. This continuous operation forms continuous oil supply.

hydromat pump maintenance

(1) Check the plunger for scratches and corrosion; replace with new parts if necessary. (2) Check the fit of the plunger pair. Insert the plunger end into the plunger sleeve and tilt it about 60°. If the plunger slides down slowly under its own weight, the fit is good. (3) Check the sealing of the plunger pair. Hold the plunger sleeve with one hand, blocking the top and side intake ports of the plunger with two fingers. Pull out the plunger with the other hand. If significant suction is felt and the plunger immediately retracts to its original position upon release, the plunger pair sealing is good; otherwise, replace the plunger pair. (4) Check the decompression band of the delivery valve pair for wear, steps, or scratches; replace if necessary. (5) Check the fit of the delivery valve pair. Block the lower hole of the delivery valve with one finger and gently press the delivery valve downward with another finger. When the finger leaves the top of the delivery valve, if it automatically springs back to its original position, the delivery valve pair sealing is good; otherwise, replace the delivery valve pair. (6) Check 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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