German B.HEPWORTH pump B.HEPWORTH model B.HEPWORTH price

B.HEPWORTH pumps are important equipment for deep well water lifting. 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 trim 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.

B.HEPWORTH 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 unused for a long period, the impeller must be rotated before operation to prevent seizure and 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 pump casing's diffusion chamber, causing pressure to increase, and then flows out through the pump outlet and discharge pipe. At this time, a vacuum low-pressure zone without air or liquid forms at the center of the blades because the liquid is thrown to the periphery. Under the action of atmospheric pressure on the liquid surface, liquid from the sump flows into the pump through the suction pipe. In this way, liquid is continuously sucked up from the sump and continuously discharged from the discharge pipe.

B.HEPWORTH pump mechanical principle

The total stroke L of the plunger's reciprocating motion is constant and determined by the cam lift. The fuel supply volume per plunger cycle depends on the fuel supply stroke; the fuel supply stroke is variable and not controlled by the camshaft. The start of fuel supply does not change with variations in the fuel supply stroke. Rotating the plunger changes the end timing of fuel supply, thereby changing the fuel supply 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) Oil 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 pump 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 oil pump enters the pump chamber through the oil hole. The oil intake ends when the plunger reaches bottom dead center. 2) Oil return process: The plunger supplies oil upward. When it moves up to the point where the helical groove (cut-off edge) on the plunger communicates with the return oil hole on the sleeve, the low-pressure oil circuit in the pump chamber connects 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 supply. 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.

B.HEPWORTH 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 end 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 end 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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