German HALDEX pump HALDEX model HALDEX price

HALDEX 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.

HALDEX 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 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 driving 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 press tightly against 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 by centrifugal force and hydraulic pressure. When the rotor rotates, due to the eccentricity of the stator, the plunger will reciprocate, and its stroke is 2 times the eccentricity of the stator. The eccentricity of the stator can be adjusted by two plungers positioned radially opposite each other on the pump body. Oil inlet and outlet pass through channels on the pump body and distribution shaft, and are 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 the volume change produced by the reciprocating motion of plungers parallel to the transmission shaft within the plunger holes. Since the plungers and plunger holes of plunger pumps are circular parts, they can achieve very high precision fit during machining.

HALDEX pump operating mode

During operation, under the action of the cam on the fuel injection pump camshaft and the plunger spring, the plunger is forced to move up and down reciprocally, thereby completing the fuel pumping task. The fuel pumping process can be divided into the following three stages. Conclusion: Through the above discussion, the following conclusions are drawn: (1) The total stroke L of the plunger's reciprocating motion is constant, determined by the cam lift. (2) The fuel supply volume per cycle of the plunger depends on the fuel supply stroke; the fuel supply stroke is not controlled by the camshaft and is variable. (3) The start moment of fuel supply does not change with the change of the fuel supply stroke. (4) Rotating the plunger can change the end moment of fuel supply, thereby changing the fuel supply volume. 3. Domestic series plunger-type fuel injection pumps: Domestic series plunger pumps mainly include A, B, P, Z, and Series I, II, III, etc. Serialization is based on different requirements for fuel supply volume according to the single-cylinder power range of diesel engines. Based on plunger stroke, pump cylinder center distance, and structural form, different sizes of plunger diameters are matched to form several types of fuel injection pumps with unequal fuel supply volumes in one working cycle, to meet the needs of various diesel engines. The working principles and structural forms of domestic series fuel injection pumps are basically the same. Taking the A type pump as an example, the structure and working principle of the plunger-type fuel injection pump are introduced. The plunger pump consists of four main parts: pumping element, fuel quantity adjustment mechanism, transmission mechanism, and pump body. It features microprocessor intelligent control, LCD display, and communication with computers, with characteristics such as stable working pressure, low pulsation, and convenient operation. It is widely used in biochemistry, pharmaceuticals, chemicals, environmental protection, and other industries, meeting the requirements of these industries for continuous constant-pressure and constant-flow liquid transportation.

HALDEX 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, tilt it about 60°; if the plunger can slowly slide down under its own weight, the fit is good. (3) Check the sealing of the plunger pair. Hold the plunger sleeve with one hand, block the plunger top and side oil inlet with two fingers. Pull out the plunger with the other hand; if you feel significant suction and the plunger immediately retracts to its original position upon release, the plunger pair sealing is good; otherwise, replace the plunger pair. (4) Check whether the decompression band of the delivery valve pair is worn with 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, gently press the delivery valve downward with another finger. When the finger leaves the upper end 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 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 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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