Reasons for the decline in efficiency of double suction pump
1. Due to the erosion of the water flow, the inner wall of the pump flow passage and the impeller surface become rough and uneven, the friction coefficient of the flow passage in the water pump increases, and the flow rate of the water in the pump is large, and the head loss increases. The hydraulic efficiency is reduced.
2. Due to the application of drugs or water quality before the pump, the pump casing is seriously fouled or corroded. Severe fouling in the pump casing can increase the wall thickness of the pump casing by about 2 ram, and the scale of the pump wall is scaled, which reduces the volume of the pump body, reduces the amount of pumping, and the flow path is rough, and the head loss increases. Both customer productivity and hydraulic efficiency are reduced.
3. Due to casting defects, cavitation, abrasion, corrosion and chemical attack caused by the pump processing process, voids or cracks are generated in the pump flow path, and vortices are generated when the water flows, resulting in energy loss. The hydraulic efficiency is reduced.
4. Cavitation on the surface of the impeller. Due to the negative pressure generated when the blade is running on the water surface, when the pressure Pk
5. Volume loss and mechanical loss. Due to the long pump life, mechanical wear causes leakage and increased resistance, resulting in reduced volumetric efficiency and mechanical efficiency.
The above reasons make the performance of the pump worse. The operating efficiency is reduced by 2 to 5%, which can seriously reduce the pump efficiency by more than 10%.
Scheme to improve pump efficiency
When the polymer composite material is used, the water flowing in the pump is affected by the friction with the surface of the runner and the pump impeller and the viscosity of the water itself. The energy consumed by the pump is mainly used to resist the flow friction of the water surface. Eddy current resistance. The energy (head loss) that water consumes during the flow is used to overcome the friction between the internal friction and the interface between the water and the equipment. If the surface of the pump and impeller is smooth (this surface is called a hydraulic smooth surface), the surface resistance is small. The energy consumption is small, and the polymer composite material is sprayed on the flow surface of the pump and the impeller to form a hydraulic smooth surface. The surface smoothness of the ultra-smooth surface coating is 20 times that of the polished stainless steel, and the extremely smooth surface is reduced. The stratification of the fluid in the pump reduces the turbulence inside the pump, reduces the volume loss and hydraulic loss in the pump, and reduces the power consumption. The purpose of reducing the loss of water flow resistance is achieved, thereby improving the hydraulic efficiency of the water pump, and at the same time improving the mechanical efficiency and volumetric efficiency to a certain extent. The compactness of the molecular structure of the coating can isolate the contact between the medium such as air and water and the base material of the pump impeller to minimize electrochemical corrosion and corrosion.
In addition, the polymer composite material is a high molecular polymer, which is chemically resistant, can improve the corrosion resistance of the pump, and can greatly enhance the pump's resistance to erosion and corrosion. Adopting new sealing technology The pump has a part of energy loss during the working process, including mechanical wear, volume loss and hydraulic loss. The mechanical loss refers to the pump sleeve sealing friction, bearing friction, impeller surface and liquid friction. The use of Blu-Goo super lubricant to reduce the sealing friction and bearing friction of the pump bushing, thereby achieving the purpose of improving pump efficiency, energy saving and consumption reduction. It is a special inert material with a variety of uses, mainly used to reduce intermetallic contact. As a thread seal compound, the material forms a contact surface between the external thread and the internal thread to protect the joint from friction and wear, and can withstand a pressure of 1407 kg/cm 2 or even wear, corrosion or error. Machined threaded surface. This product is also an excellent gearbox additive that forms a film on the inner part to reduce friction, gear noise and leakage. It also significantly reduces the moment stress and meets the dynamic decompression requirements. It can be used on the gasket face or as a filler to seal through to prevent fluid leakage. It can be applied at a temperature of 316 °C.
