Wuxi New District Jincheng Electric Co

'Wuxi Jincheng Electric Co., Ltd. tells you: The water pump impeller is made of cast iron. What important role do the blades on the water pump impeller play? The shape and size of the water pump impeller are closely related to the performance of the water pump. Water pump impellers can generally be divided into two types: single suction type and double suction type? Single-suction impellers absorb water from one side, and small-flow water pump impellers are mostly of this type. Double-suction impellers absorb water from both sides, and large-flow water pump impellers all use double-suction impellers.
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' Overview
' The impeller is the core component of the water pump and the main factor that affects the working efficiency. Under certain working conditions, if the impeller is not designed well, there will be damage at the pump inlet and blades. Hydraulic loss and gap loss occur. Then when choosing, you must choose a professional water pump impeller manufacturer.
'Centrifugal pump type water pump
The impeller mainly has the following four types: closed type, front semi-open type, rear semi-open type, and open type.
', Closed impeller: composed of blades and front and rear covers. Closed impellers have higher efficiency and are more difficult to manufacture. Most commonly used in centrifugal pumps. Suitable for transporting clean water, solutions and other clean liquids with low viscosity and without particles.
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' Semi-open impeller: There are generally two structures. One is the front semi-open type, which is composed of a rear cover and blades. The impeller efficiency of this structure is low. In order to improve the efficiency, it needs to be equipped with an optional The other type of sealing ring for adjusting the gap is the rear semi-open type, which is composed of a front cover and a blade. Since the same sealing ring as the closed water pump impeller can be used, the efficiency is basically the same as that of the closed impeller, and the blades are In addition to transporting liquid, it also has the sealing function of the back blade or auxiliary impeller. Semi-open impeller is suitable for transporting liquid containing solid particles, fibers and other suspended matter. Semi-open impellers are less difficult to manufacture, lower in cost, and have strong adaptability. In recent years, they have been increasingly used in centrifugal pumps for refining and chemical industries, and are used to transport clean water and liquids close to clean water.
', Open impeller: an impeller with only blades and blade reinforcements, without front and rear covers. The number of open impeller blades is fewer - blades. The water pump impeller has low efficiency and is rarely used. It is mainly used to transport liquids with higher viscosity and slurry liquids.
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' Centrifugal pump type water pump
The blades of the impeller are generally backward curved blades. There are two types of blades: cylindrical and twisted. The use of twisted blades can reduce the load on the blades, improve the suction performance of the centrifugal pump, and improve the anti-cavitation ability. However, it is difficult to manufacture and the cost is high. Water pump impeller Centrifugal pumps for refining and chemical industry require the impeller to be a cast or fully welded integral water pump impeller. Welded water pump impellers have been developed in recent years and are mostly used to cast metal materials with poor performance, such as iron and its alloys, to manufacture special centrifugal pumps for the chemical industry.
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' The geometric accuracy and surface finish of the welded
water pump impeller are better than those of the cast
impeller, which is beneficial to improving the efficiency of the centrifugal pump
. The impeller refers to the disc equipped with moving blades and is an integral part of the impulse turbine rotor. It also refers to the general name of the wheel disk and the rotating blades installed on it.
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' Wear prevention:
' The wear of the fan impeller is related to the composition, particle size, concentration, shape, impact speed, impact angle, chemical composition, properties, temperature and humidity of the abrasive, etc. factors related. The uneven gas flow inside the impeller accelerates wear. As measures to prevent impeller wear: first, to reduce dust and corrosive gases entering the fan, for which the fan operating system must be modified; second, to try to make local wear tend to be uniform, which requires improving the wear resistance of the impeller. To improve the wear resistance of the impeller, materials with high hardness and good wear resistance can be used. This not only brings difficulties to the impeller manufacturing process, but is also unreasonable from an economic point of view. Therefore, it is an economical and reasonable solution to improve the surface quality of the fan impeller, surfacing or spray welding (spray coating) the wear-resistant layer on the seriously worn parts of the impeller, and adding a layer of lining plate to the blade to achieve wear resistance. .
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' Apply anti-wear coating
: The main anti-wear coatings include resin anti-corrosion and wear-resistant coating, rubber anti-corrosion and wear-resistant coating, quartz water-added glass and ceramic anti-corrosion and wear-resistant materials wait. In order to enable wear-resistant compounds to be used on fan impellers, our company and Chesterton Company jointly conducted some experiments. Wear-resistant compound is a ceramic composite material used to repair and protect metal surfaces that are subject to wear. This compound has good wear resistance and good bonding with the base material. However, the coating thickness of the wear-resistant compound must be equal to or thicker, which is not suitable for some narrow flow channels or rotors with strict starting requirements. Similarly, a layer of wear-resistant lining plates is added to the blades to solve the problem of fan impeller wear. Such problems also exist.