German Hormec pump Hormec model Hormec price

Hormec 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.

Hormec pump structural form

Plunger pumps are divided into two representative structural forms: axial plunger pumps and radial plunger pumps. Since radial plunger pumps are a new type of high-efficiency pump with high technical content, with the continuous acceleration of localization, radial plunger pumps will inevitably become an important part of the application field of plunger pumps. A radial plunger pump is a plunger pump in which the reciprocating motion direction of the piston or plunger is perpendicular to the drive shaft. Working principle of radial plunger pump: The drive torque is transmitted from the drive shaft to the star-shaped hydraulic cylinder rotor through a cross coupling, and the stator is not subject to other lateral forces. The rotor is mounted on the distribution shaft. The radially arranged plungers located in the rotor adhere closely to the eccentric stroke stator through hydrostatically balanced shoes. The plunger is connected to the shoe via a ball joint and locked with a retaining ring. Two retaining rings hold the shoes against the stroke stator. When the pump rotates, it presses against the inner surface of the stator relying on centrifugal force and hydraulic pressure. As the rotor rotates, due to the eccentricity of the stator, the plunger performs reciprocating motion, and its stroke is 2 times the stator eccentricity. The eccentricity of the stator can be adjusted by two plungers positioned radially opposite each other on the pump body. Oil inlet and outlet occur through flow channels in the pump body and distribution shaft, controlled by the suction port on the distribution shaft. The hydraulic pressure generated in the pump body is absorbed by the hydrostatically balanced surface. The hydrostatic balance of the friction pair adopts an over-balance pressure compensation method, forming open-loop control. The bearings supporting the drive shaft only serve a supporting role and are not subject to other external forces. In hydraulic systems: Axial plunger pumps operate by utilizing volume changes generated by the reciprocating motion of plungers parallel to the transmission shaft within plunger bores. Since the plungers and plunger bores of plunger pumps are circular parts, they can achieve very high precision fits during machining.

Hormec pump mechanical principle

The total reciprocating stroke L of the plunger pump plunger is constant and determined by the cam lift. The fuel supply volume per cycle depends on the fuel supply stroke; the fuel supply stroke is variable and not controlled by the camshaft. The start moment of fuel supply does not change with variations in the fuel supply stroke. Rotating the plunger can change the end moment of fuel supply, thereby changing the fuel supply volume. When the plunger pump is working, under the action of the cam on the fuel injection pump camshaft and the plunger spring, the plunger is forced to perform up-and-down reciprocating motion, thereby completing the pumping task. The pumping process can be divided into the following two stages. 1) Oil intake process: After the raised 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 oil 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 plunger moves to the bottom dead center, and the oil intake ends. 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 aligns with the oil return hole on the sleeve, the low-pressure oil circuit in the pump chamber communicates with the central hole, radial hole, and helical groove at the head of the plunger. The oil pressure drops suddenly, and the delivery valve closes rapidly under the force of the spring, stopping fuel supply. The plunger continues to move upward. After the raised part of the cam rotates past, the plunger moves downward again under the action of the spring. At this point, the next cycle begins. Taking one plunger as an example for principle introduction: A plunger pump has two check valves with opposite directions. When the plunger moves in one direction, negative pressure appears 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, the other check valve opens, and the liquid sucked into the cylinder is discharged. This working mode forms continuous fuel supply after continuous motion.

Hormec pump maintenance

(1) Inspect the plunger for scratches and corrosion; replace with a new part if necessary. (2) Check the fit of the plunger assembly. Insert the plunger end into the plunger barrel, tilt it by 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 barrel, block the oil inlet at the top and side of the plunger with two fingers. Pull out the plunger with the other hand; significant suction felt and immediate return to the original position upon release indicate 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 fit 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; if it automatically springs back to its original position when the finger is removed from the top end, 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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