Product Introduction

Water pump impeller

The core components of a water pump

The impeller of the water pump is made of cast iron. The blades on the impeller of a water pump play a major role, and the shape and size of the impeller are closely related to the performance of the water pump. Water pump impellers can generally be divided into two types: single suction and double suction. Single suction impellers absorb water from one side, while small flow pump impellers are mostly of this type. The double suction impeller is used for both sides of water absorption, and the high flow water pump impeller adopts the double suction impeller.

Essential information

The impeller is the core component of a water pump and the main influencing factor on work efficiency. Under specific working conditions, if the impeller design is not good, hydraulic and clearance losses will occur at the pump inlet and blades So in terms of selection, it is necessary to choose a professional manufacturer of water pump impellers.

Basic Introduction

There are four main forms of impeller for centrifugal pump pumps: closed, front half open, rear half open, and open.

1. Closed impeller: composed of blades and front and rear cover plates. Closed impeller has high efficiency and manufacturing difficulty. Most commonly used in centrifugal pumps. Suitable for conveying clean liquids with low viscosity, such as clear water and solutions, that do not contain particles.

2. Half open impeller: There are generally two types of structures. One is the front half open type, which is composed of a rear cover plate and blades. This structure has lower impeller efficiency and requires adjustable clearance sealing rings to improve efficiency. The other is the rear half open type, which is composed of a front cover plate and blades. Since the same sealing ring can be used as the impeller of a closed water pump? The efficiency is basically the same as that of a closed impeller, and the blades not only transport liquid, but also have the sealing effect of a back blade or auxiliary impeller. A semi open impeller is suitable for conveying liquids containing suspended solids such as solid particles and fibers. The manufacturing difficulty of semi open impeller is relatively low, the cost is low, and it has strong adaptability. In recent years, its application in centrifugal pumps for refining and chemical industry has gradually increased, and it is used to transport clean water and liquids similar to clean water.

3. Open impeller: an impeller with only blades and blade reinforcement ribs, without front and rear cover plates. The number of open impeller blades is less than 2-5. The impeller of a water pump has low efficiency and is rarely used, mainly for conveying liquids with high viscosity and slurry liquids.

The blades of the impeller of a centrifugal pump type water pump are generally backward curved blades. There are two types of blades: cylindrical and twisted. The application of twisted blades can reduce the load on the blades, improve the suction performance of centrifugal pumps, and enhance their resistance to cavitation. However, manufacturing is difficult and the cost is high. The centrifugal pump used in refining and chemical industry requires the impeller to be a cast or fully welded integral water pump impeller. Welding water pump impellers have been developed in recent years and are mostly used for casting metal materials with poor performance, such as iron and its alloys, in the manufacturing of special centrifugal pumps for chemical purposes. The geometric accuracy and surface smoothness of welded water pump impellers are better than those of cast impellers, which is beneficial for improving the efficiency of centrifugal pumps.

Wear and maintenance

Cause of malfunction

① The inlet water quality of the water pump is poor. (High impurity content)

② The faucet filter or inlet horn is too close to or placed in the sediment.

③ The conveying medium is harsh, and the material selection of the impeller is inappropriate.

④ The pump impeller nut often or for a long time becomes loose, causing the impeller to loosen and wear excessively.

⑤ The water pump often operates under cavitation conditions, which increases the degree of cavitation damage to the water pump.

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Detection Systems

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