German heidenhain pump heidenhain model heidenhain price

heidenhain pumps are important equipment for lifting water from deep wells. During operation, the entire unit is submerged in water to extract groundwater to the surface. They are used for domestic water supply, mine emergency rescue, industrial cooling, farmland irrigation, seawater lifting, ship ballast adjustment, and fountain landscapes. Hot water submersible pumps are used for hot spring bathing and are also suitable for extracting groundwater from deep wells, as well as for water lifting projects in rivers, reservoirs, and canals. They are mainly used for farmland irrigation and water supply for people and livestock in high mountain areas, and can also provide cooling for central air conditioning, heat pump units, and chiller pump units for cities, factories, railways, mines, and construction site drainage. The general flow rate can reach 5~650m³/h, and the head can reach 10-551 meters.

heidenhain pump working principle

There are several types of submersible pumps; the motor windings can be oil-immersed, water-immersed, or dry-type. You must read the manual before use to avoid errors. If the pump has not been used for a long time, the impeller must be rotated before use to prevent seizure and winding burnout due to prolonged inactivity. Before starting the pump, the suction pipe and the pump interior must be filled with liquid. After starting, the impeller rotates at high speed, causing the liquid inside to rotate with the blades. Under the action of centrifugal force, the liquid flies away from the impeller and is ejected outward. The ejected liquid gradually slows down in the diffusion chamber of the pump casing, causing the pressure to increase, and then flows out through the pump outlet and discharge pipe. At this time, a vacuum low-pressure zone with neither air nor liquid is formed at the center of the blades because the liquid is thrown to the periphery. Under the action of atmospheric pressure on the liquid surface, the liquid in the sump flows into the pump through the suction pipe. In this way, the liquid is continuously sucked up from the sump and continuously flows out from the discharge pipe.

heidenhain pump mechanical principle

The total stroke L of the plunger's reciprocating motion is constant and is determined by the cam lift. The fuel delivery volume per plunger cycle depends on the fuel delivery stroke; the fuel delivery stroke is variable and not controlled by the camshaft. The start of fuel delivery does not change with variations in the fuel delivery stroke. Rotating the plunger changes the end of fuel delivery timing, thereby changing the fuel delivery volume. When the plunger pump operates, the cam on the fuel injection pump camshaft and the plunger spring force the plunger to move up and down reciprocally, thus completing the pumping task. The pumping process can be divided into the following two stages. 1) Fuel intake process: After the cam lobe passes, under the action of the spring force, the plunger moves downward, creating a vacuum in the space above the plunger (called the pumping chamber). When the upper end face of the plunger opens the inlet hole on the plunger sleeve, diesel fuel filling the oil passage in the upper body of the fuel pump enters the pumping chamber through the oil hole. The intake ends when the plunger reaches bottom dead center. 2) Return process: The plunger supplies fuel upward. When it moves up to the point where the helical groove (cut-off edge) on the plunger aligns with the return hole on the sleeve, the low-pressure oil circuit in the pumping chamber communicates with the central hole, radial hole, and helical groove at the plunger head. The oil pressure drops suddenly, and the delivery valve closes rapidly under the action of the spring force, stopping fuel delivery. The plunger continues to move upward; after the cam lobe passes, the plunger moves downward again under the action of the spring. 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 sucking liquid into the cylinder. When the plunger moves in the other direction, the liquid is compressed, opening the other check valve, and the liquid sucked into the cylinder is discharged. This operating mode forms continuous fuel supply after continuous motion.

heidenhain pump maintenance

(1) Inspect the plunger for scratches and corrosion; replace with new parts if necessary. (2) Check the fit of the plunger assembly. Insert the plunger end into the plunger sleeve and tilt it approximately 60°. If the plunger slides down slowly under its own weight, the fit is good. (3) Check the sealing of the plunger assembly. Hold the plunger sleeve with one hand, blocking the plunger top and the side inlet port 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 assembly sealing is good; 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 fit 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. When the finger leaves the top of the delivery valve, if it automatically springs back to its original position, the delivery valve assembly sealing is good; otherwise, replace the delivery valve assembly. (6) Inspect the tappet body. The standard clearance between the fuel 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 control sleeve groove, which should be 0.02～0.08mm. If it exceeds 0.12mm, the control sleeve must be replaced.

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