German Woerner pump Woerner model Woerner price

Woerner 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 deliver 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 heavy loaders.

Woerner pump structural forms

Piston pumps are divided into axial piston pumps and radial piston pumps, which are two representative structural forms; since radial piston pumps are a new type of high-efficiency pump with high technical content, with the acceleration of localization, radial piston pumps will inevitably become an important part of the application field of piston pumps; a radial piston pump is a piston pump where the reciprocating motion direction of the piston or plunger is perpendicular to the drive shaft. Working principle of radial piston pump: Drive torque is transmitted from the drive shaft through a cross coupling to the star-shaped hydraulic cylinder block rotor, and the stator is not subject to other lateral forces. The rotor is mounted on the distribution shaft. The radially arranged pistons located in the rotor press tightly against the eccentric stroke stator through hydrostatically balanced slippers. The piston is connected to the slipper via a ball joint and locked with a retaining ring. Two retaining rings hold the slippers 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 piston will reciprocate, and its stroke is 2 times the eccentricity of the stator. The eccentricity of the stator can be adjusted by two pistons at opposite radial positions on the pump body. Oil inlet and outlet pass through flow 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 piston pumps operate by utilizing volume changes produced by the reciprocating motion of pistons parallel to the transmission shaft within piston bores. Since the pistons and piston bores of piston pumps are circular parts, very high precision fits can be achieved during machining.

Woerner pump mechanical principles

The total reciprocating stroke L of the plunger in a plunger pump is constant and is determined by the cam lift. The fuel delivery volume per cycle depends on the effective delivery stroke; this effective stroke is variable and is not controlled by the camshaft. The start of fuel delivery does not change with variations in the effective delivery stroke. Rotating the plunger changes the end-of-delivery timing, thereby altering the fuel delivery volume. During operation of the plunger pump, the cam on the injection pump camshaft and the plunger spring force the plunger to perform reciprocating up-and-down motion, thus completing the pumping task. The pumping process can be divided into the following two stages: 1) Intake process: After the lobe of the cam rotates past, the plunger moves downward under spring force. A vacuum is created in the upper space of the plunger (called the pumping chamber). When the upper end face of the plunger uncovers the inlet port on the plunger sleeve, diesel fuel filling the oil passages in the upper body of the pump enters the pumping chamber through the port. The intake process ends when the plunger reaches bottom dead center. 2) Return process: The plunger moves upward to deliver fuel. When the helical groove (cut-off edge) on the plunger aligns with the return port on the sleeve, the low-pressure oil circuit in the pumping chamber communicates with the central bore, radial holes, and helical groove at the plunger head. Oil pressure drops sharply, and the delivery valve closes rapidly under spring force, stopping fuel delivery. The plunger continues to move upward; after the lobe of the cam rotates past, the plunger moves downward again under spring force. 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 orientations. When the plunger moves in one direction, negative pressure develops 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, the other check valve opens, and the liquid drawn into the cylinder is discharged. This operating mode results in continuous fuel delivery during continuous motion.

Woerner pump mechanical maintenance

For piston pumps supplied with oil by a charge pump, after 3000h of use, operators need to inspect the piston pump 1-2 times daily to check whether the operating sound of the hydraulic pump is normal. If a decrease in hydraulic cylinder speed or stalling is found, the charge pump should be disassembled for inspection to check for scratches on the impeller edge and whether the internal gear pump clearance is excessive. For self-priming piston pumps, the oil level in the hydraulic tank must not be lower than the lower limit of the oil gauge; sufficient hydraulic oil must be maintained. The higher the cleanliness of the hydraulic oil, the longer the service life of the hydraulic pump. The most important component of a piston pump is the bearing. If the bearing has clearance, the normal clearance of the three pairs of friction pairs inside the hydraulic pump cannot be guaranteed, and the thickness of the static hydraulic support oil film of each friction pair will be damaged, reducing the service life of the piston pump bearing. According to data provided by hydraulic pump manufacturers, the average service life of bearings is 10000h, and new ones need to be replaced if this value is exceeded. Disassembled bearings cannot be tested for clearance without professional testing instruments; only visual inspection is possible. If scratches or discoloration are found on the roller surface, they must be replaced. When replacing bearings, pay attention to the English letters and model numbers of the original bearings. Piston pump bearings mostly adopt large load capacity bearings. Purchase products from the original manufacturer with original specifications. If changing to another brand, consult experienced personnel to check tables for replacement, with the aim of maintaining the precision grade and load capacity of the bearing. The length of service life of a piston pump is related to daily maintenance, the quantity and quality of hydraulic oil, and oil cleanliness. Avoiding wear on the friction pairs of the piston pump caused by particles in the oil is also an effective way to extend the service life of the piston pump. During maintenance, try to use original factory-produced parts when replacing components. These parts are sometimes more expensive than other counterfeit parts, but their quality and stability are better. Buying cheap counterfeit parts may seem to save costs in the short term, but it brings hidden dangers and may cause greater harm to the use of the piston pump. There are two forms of distribution plates: flat distribution and spherical distribution. For friction pairs with spherical distribution, if the scratches on the cylinder block distribution surface are relatively shallow, they can be repaired by grinding; if the grooves on the cylinder block distribution surface are deep, surface engineering technology should first be used to fill the grooves before grinding. Blind grinding should be avoided to prevent the copper layer from becoming too thin or leaking oil exposing the steel base. Piston pumps can also use frequency converters to save electrical energy. Engineers from Shanghai Zhengyi pointed out: In actual production processes, piston pumps usually regulate their working status by pressure or flow. When the actual pressure is greater than the required pressure, it is regulated by a relief valve to keep the working pressure stable, allowing the relief valve to release the excess. However, the motor always runs at full speed with repeated actions, and power consumption remains unchanged. When using overflow to regulate pressure and flow, part of the surplus flows back to the original system, resulting in useless power in the piston pump and low work efficiency. If a Chuangjie energy-saving frequency converter is used, the relief valve can be set to close, and the working pressure is automatically adjusted by the energy-saving frequency converter itself to maintain stable working pressure and automatically track the equipment pressure. This achieves automated control, thereby saving energy consumption. The biggest advantage of this regulation method is that it can reduce the operating energy consumption of the piston pump, with power saving effects reaching 30% or more.

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