German etatronds pump etatronds model etatronds price

etatronds 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 ballast 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 be used for central air conditioning cooling, heat pump units, chiller pump units, and drainage in cities, factories, railways, mines, and construction sites. The general flow rate can reach 5~650m³/h, and the head can reach 10-550 meters.

etatronds pump working principle

There are several types of submersible pumps; the motor windings can be oil-immersed, water-immersed, or dry-type. Before use, you must read the manual carefully to avoid errors. If the pump has not been used for a long time, the impeller must be rotated before use 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 diffusion chamber of the pump casing, while the pressure gradually increases, and then flows out through the pump outlet and discharge pipe. At this time, a vacuum low-pressure zone without air or liquid is formed at the center of the blades because the liquid is thrown to the periphery. Under the action of atmospheric pressure on the liquid surface, the liquid in the sump flows into the pump through the suction pipe. In this way, the liquid is continuously sucked up from the sump and continuously flows out from the discharge pipe.

etatronds pump mechanical structure

The submersible electric pump unit consists of four main parts: the water pump, the submersible motor (including cable), the water delivery pipe, and the control switch. The submersible pump is a single-suction multi-stage vertical centrifugal pump. The submersible motor is a sealed, water-filled, wet-type, vertical three-phase squirrel-cage asynchronous motor. The motor and water pump are directly connected via a claw-type or single-key cylindrical coupling. It is equipped with three-core cables of different specifications. The starting equipment includes air switches and autotransformer reduced-voltage starters of different capacity ratings. The water delivery pipes are made of steel pipes of different diameters, connected using flanges. High-head electric pumps use gate valves for control. A labyrinth-type sand guard and two reverse-assembled skeleton oil seals are installed on the upper part of the submersible motor shaft to prevent flowing sand from entering the motor. The submersible motor uses water-lubricated bearings. The lower part is equipped with a rubber pressure-regulating membrane and a pressure-regulating spring, forming a pressure-regulating chamber to adjust pressure changes caused by temperature. The motor windings use polyethylene insulation and nylon-sheathed water-resistant magnet wire. The cable connection follows cable joint procedures: remove the joint insulation, scrape off the varnish layer, connect them separately, weld firmly, wrap with a layer of raw rubber, then wrap with 2-3 layers of waterproof adhesive tape, and finally cover with 2-3 layers of waterproof rubber tape or bond a layer of rubber (bicycle inner tube) with water-resistant adhesive to prevent water ingress. Each guide shell stage of the submersible pump is equipped with a rubber bearing. The impeller is fixed to the pump shaft with a tapered sleeve. The guide shells are connected into one unit using threads or bolts. A check valve is installed at the upper part of high-head submersible pumps to prevent damage to the unit caused by water hammer during shutdown. The motor is sealed using precision spigot bolts, and the cable outlet is sealed with a rubber gasket. There is a water filling hole and an air vent hole at the upper end of the motor, and a drain hole at the lower part. Upper and lower thrust bearings are installed at the lower part of the motor. The thrust bearings have grooves for cooling and mate with stainless steel thrust discs to withstand the upper and lower axial forces of the water pump.

etatronds 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 barrel 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 barrel with one hand, and block the top and side oil inlet ports of the plunger 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) Check whether the decompression band of the delivery valve assembly is worn, stepped, or scratched; 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 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 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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