German ERGOSWISS pump ERGOSWISS model ERGOSWISS price

ERGOSWISS 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.

ERGOSWISS pump operating mode

During operation, under the action of the cam on the injection pump camshaft and the plunger spring, the plunger is forced to perform reciprocating up-and-down motion, thereby completing the pumping task. The 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 reciprocating motion is constant, determined by the cam lift. (2) The fuel supply volume per plunger cycle depends on the supply stroke; the supply stroke is not controlled by the camshaft and is variable. (3) The start timing of fuel supply does not change with the change of the supply stroke. (4) Rotating the plunger can change the end timing of fuel supply, thereby changing the fuel supply volume. 3. Domestic series plunger injection pumps Domestic series plunger pumps mainly include A, B, P, Z and Series I, II, III. Serialization is based on different fuel supply requirements according to the single-cylinder power range of diesel engines, using plunger stroke, pump cylinder center distance, and structural type as the basis, and then matching with plunger diameters of different sizes to form several types of injection pumps with unequal fuel supply volumes in one working cycle, to meet the needs of various diesel engines. The working principle and structural type of domestic series injection pumps are basically the same. Taking the A type pump as an example, the structure and working principle of the plunger injection pump are introduced. The plunger pump consists of four main parts: pumping unit, 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, pharmaceutical, chemical, environmental protection and other industries, meeting the requirements of these industries for continuous constant-pressure and constant-flow liquid transportation.

ERGOSWISS pump classification

Plunger pumps are generally divided into single plunger pumps, horizontal plunger pumps, axial plunger pumps, and radial plunger pumps. 1) Single plunger pump: The structure mainly consists of an eccentric wheel, plunger, spring, cylinder block, and two check valves. A sealed volume is formed between the plunger and the cylinder bore. One rotation of the eccentric wheel causes the plunger to reciprocate once; downward motion sucks oil, and upward motion discharges oil. The volume of oil discharged per revolution of the pump is called displacement, which is only related to the structural parameters of the pump. 2) Horizontal plunger pump: Horizontal plunger pumps have several plungers (generally 3 or 6) installed in parallel. One 1 crankshaft drives the plungers to perform reciprocating motion via connecting rod sliders or directly via an eccentric shaft, realizing a hydraulic pump for suction and discharge of liquids. They all adopt valve-type distribution devices, and most are fixed-displacement pumps. Emulsion pumps in coal mine hydraulic support systems are generally horizontal plunger pumps. Emulsion pumps are used at coal mining faces to provide emulsion for hydraulic supports. The working principle relies on the rotation of the crankshaft to drive the Piston to perform reciprocating motion, realizing liquid suction and discharge. 3) Axial type: Axial plunger pumps (English name: Piston pump) are plunger pumps where the reciprocating motion direction of the piston or plunger is parallel to the central axis of the cylinder block. Axial plunger pumps operate by utilizing the volume change produced by the reciprocating motion of plungers parallel to the drive shaft within the plunger bores. Since both the plunger and the plunger bore are circular parts, they can achieve high-precision fit, resulting in high volumetric efficiency. 4) Straight-axis swashplate type: Straight-axis swashplate plunger pumps are divided into pressure-supply type and self-priming type. Pressure-supply type hydraulic pumps mostly use pressurized oil tanks. For hydraulic tanks supplied by air pressure, after each machine startup, one must wait until the hydraulic oil tank reaches the operating air pressure before operating the machinery. If the machine is started when the air pressure in the hydraulic oil tank is insufficient, it will cause the slipper shoes inside the hydraulic pump to pull off, resulting in abnormal wear between the return plate and the pressure plate in the pump body. 5) Radial type: Radial plunger pumps can be divided into two categories: valve distribution and shaft distribution. Valve distribution radial plunger pumps have disadvantages such as high failure rate and low efficiency. Shaft distribution radial plunger pumps developed in the 70s and 80s internationally overcame the shortcomings of valve distribution radial plunger pumps. Due to the structural characteristics of radial pumps, shaft distribution radial plunger pumps are more impact-resistant, have longer service life, and higher control precision than axial plunger pumps. The variable displacement of short-stroke variable pumps is achieved by changing the eccentricity of the stator under the action of the variable plunger and limit plunger, and the maximum eccentricity of the stator is 5–9mm (depending on the displacement size), with a very short variable stroke. Moreover, the variable mechanism is designed for high-pressure operation and controlled by a control valve. Therefore, the pump has a fast response speed. The radial structural design overcomes problems such as uneven wear of slipper shoes in axial plunger pumps, significantly improving its impact resistance. 6) Hydraulic type: Hydraulic plunger pumps rely on pressurized oil tanks. After each machine startup, one must wait until the hydraulic oil tank reaches the operating air pressure before operating the machinery. Straight-axis swashplate plunger pumps are divided into pressure-supply type and self-priming type. Pressure-supply type hydraulic pumps mostly use pressurized oil tanks; some hydraulic pumps also have a booster feed pump that provides pressure oil to the inlet of the hydraulic pump. Self-priming type hydraulic pumps have strong self-priming capability and do not require external oil supply.

ERGOSWISS pump common problems

1) Insufficient flow. Causes and troubleshooting methods for insufficient flow in vane pumps. Loose screws at the top cover increase axial clearance, reducing volumetric efficiency. Tighten the screws appropriately to ensure uniform and proper clearance (clearance is 0.04–0.07 mm). Individual vanes slide inflexibly; clean them. If they remain inflexible after cleaning, adjust them individually in their slots. Wear on the inner surface of the stator prevents good contact between the vanes and the stator inner surface; wear on the stator inner surface usually occurs at the suction chamber. Severe wear on the face of the distribution plate requires replacement. Vanes and rotor are installed incorrectly; ensure the vane inclination direction matches the rotor rotation direction. Large system leakage; check each component for leakage and check if the pressure gauge is blocked by dirt. 2) Oil not being sucked up. Causes and troubleshooting methods for vane pumps failing to suck up oil. Oil level is too low, causing failure to suck up oil; check and fill to the specified oil level mark. Oil viscosity is too high, causing vanes to slide inflexibly in the rotor slots; generally use 20# hydraulic oil or 22# turbine oil. Poor contact between the distribution plate face and the housing inner plane causes cross-communication between high and low-pressure chambers; repair the distribution plate face. Sand holes inside the pump body cause cross-communication between high and low-pressure chambers; replace. Motor rotation direction is reversed; correct it. 3) Excessive pump noise. Clogged oil filter causes poor suction; clean. Air leakage at the suction end; check suction pipe joints one by one by applying grease; if noise decreases, tighten the joints. Directly observe if bubbles appear at the oil return port. Wear on the pump end seal; apply grease at the shaft end oil seal; if noise decreases, replace the oil seal. Pump cover screws loosen due to vibration; apply grease at the screw connections; if noise decreases, tighten the screws. Pump and motor shafts are misaligned; realign them to be concentric. The two sides of the rotor vane slots are not perpendicular to its two end faces; replace the rotor. Distribution plate unloading triangular groove is too short; modify appropriately with a file so that when the previous vane passes the unloading groove, the next vane has already detached from the suction chamber. Seal at the spline shaft end is too tight (causing heat); adjust or replace appropriately. Pump speed is too high; use at the specified speed. Insufficient oil suction by the oil pump; check oil level. Hydraulic oil is severely contaminated; remove the oil filter, check if the filter is damaged or has significant solid adsorption; replace the oil filter and hydraulic oil. Pressure oscillation; check the wear condition of the pump core total pressure valve spool.

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