Germany ALLWEILER pump ALLWEILER model ALLWEILER price

ALLWEILER pumps operate by using impeller rotation to induce centrifugal motion in water. Before starting the pump, the pump casing and suction pipe must be filled with water. Then, start the motor to drive the pump shaft, causing the impeller and water to rotate at high speed. The water undergoes centrifugal motion, is thrown toward the outer edge of the impeller, and flows into the discharge pipe of the water pump through the flow channel of the volute casing.

ALLWEILER pump structure composition

The basic structure of a centrifugal pump consists of six parts: impeller, pump body, pump shaft, bearing, sealing ring, and packing box. 1) The impeller is the core part of the centrifugal pump; it has high rotational speed and high output power. The blades on the impeller play a major role. The impeller must undergo a static balance test before assembly. The inner and outer surfaces of the impeller are required to be smooth to reduce friction loss of water flow. 2) The pump body, also known as the pump casing, is the main body of the water pump. It serves a supporting and fixing function and connects to the bracket where the bearings are installed. 3) The function of the pump shaft is to connect to the motor via a coupling and transmit the motor's torque to the impeller, making it the main component for transmitting mechanical energy. 4) Sliding bearings use transparent oil as lubricant; fill oil to the oil level line. Too much oil will seep out along the pump shaft, while too little will cause the bearing to overheat and burn out, leading to accidents! During water pump operation, the maximum bearing temperature is 85 degrees, and normal operation is around 60 degrees. 5) The sealing ring is also known as the leakage reduction ring. 6) The packing box mainly consists of packing, water seal ring, packing sleeve, packing gland, and water seal pipe. The main function of the packing box is to seal the gap between the pump casing and the pump shaft, preventing water inside the pump from leaking out and preventing outside air from entering the pump. It maintains the vacuum inside the water pump! When heat is generated by friction between the pump shaft and the packing, water from the water seal pipe flows into the water seal ring to cool the packing, ensuring normal operation of the water pump. Therefore, inspection of the packing box requires special attention during routine inspections of the water pump. The packing should be replaced after approximately 600 hours of operation.

ALLWEILER pump types

1) Single-stage pump: There is only one impeller on the pump shaft. 2) Multi-stage pump: There are two or more impellers on the pump shaft; in this case, the total head of the pump is the sum of the heads generated by n impellers. 3) Low-pressure pump: Pressure is below 100 meters of water column; 4) Medium-pressure pump: Pressure is between 100 and 650 meters of water column; 5) High-pressure pump: Pressure is above 650 meters of water column. 6) Single-suction pump: Also called single-side inlet pump, meaning there is only one water inlet on the impeller; 7) Double-suction pump: Also called double-side inlet pump, meaning there is a water inlet on both sides of the impeller. Its flow rate is twice that of a single-suction pump, which can be roughly viewed as two single-suction impellers placed back-to-back. 8) Horizontal split-case pump: There is a joint seam on the horizontal plane passing through the axis centerline. 9) Vertical joint surface pump: The joint surface is perpendicular to the axis centerline. 10) Horizontal pump: The pump shaft is in a horizontal position. 11) Vertical pump: The pump shaft is in a vertical position. 12) Volute pump: After water exits the impeller, it directly enters a pump casing with a spiral shape. 13) Guide vane pump: After water exits the impeller, it enters the guide vanes set outside it, then enters the next stage or flows into the outlet pipe. 14) Self-priming centrifugal pump: The pump shaft is lower than the surface of the suction pool; no priming is required at startup, and it can start automatically. 15) Suction centrifugal pump (non-self-priming centrifugal pump): The pump shaft is higher than the surface of the suction pool. Before starting, the pump casing and suction pipe must be filled with water. Then, drive the motor to make the impeller rotate at high speed. Water is thrown out of the impeller by centrifugal force, forming a negative pressure at the center of the impeller. Water in the suction pool enters the impeller under atmospheric pressure, is thrown out of the impeller by the high-speed rotating impeller, and enters the discharge pipe.

ALLWEILER pump industry applications

Centrifugal pumps feature a compact structure, wide flow and head ranges, suitability for mildly corrosive liquids, multiple control options, uniform flow, stable operation, and low vibration. They do not require special vibration-damping foundations. Equipment installation, maintenance, and repair costs are low. They are widely used in industries such as electric power, metallurgy, coal, and building materials to transport slurries containing solid particles, such as hydraulic ash removal in thermal power plants, ore slurry transport in metallurgical beneficiation plants, and coal slurry and heavy medium transport in coal washing plants. When a centrifugal pump operates, the pump needs to be placed on land, the suction pipe in water, and the pump requires priming before startup. Due to structural limitations, mud pumps and submersible centrifugal pumps require the motor to be placed above the water surface and the pump submerged in water; therefore, they must be fixed, otherwise, the motor falling into the water will result in motor failure. Moreover, since the long shaft length is generally fixed, pump installation and use are more troublesome, and application scenarios are subject to many restrictions.

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