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yibocommunal
14 de set. de 2022
In Biografias e Obras
During the operation of the pipeline, some factors may reduce the head. The following are the six reasons. 1. Impeller passage blocked The blockage of impeller flow passage will affect the work done by the impeller, and the pressure at the outlet will drop. This problem can be prevented by removing the pump body, removing foreign matters, and installing a filter device at the pump inlet. 2. Internal leakage occurs The clearance between the rotating part and the stationary part of the pump body is too large, which exceeds the design index, and internal leakage will occur. The phenomenon is that the discharge pressure of the pump decreases, such as the clearance between the impeller ring and the interstage clearance of multistage pump. At this time, the corresponding inspection and replacement of components should be carried out. 3. Cavitation at inlet When the inlet pressure of the pump is too low, lower than the saturated vapor pressure of the pumping ring, cavitation will occur. The solution is to check whether the inlet pipeline system is blocked, whether the opening of the inlet valve is too small, or increase the liquid level of the suction pool. 4. Speed decrease The important factors for head reduction are the outer diameter of the impeller and the speed of the pump. Under the same conditions, the head is in direct proportion to the quadratic power of the speed, so the speed has a great impact on the head. Some reasons reduce the speed of the pump, which will affect the head. At this time, check the speed of the pump. If the speed is not enough, find out the cause and eliminate it. 5. The operating point is shifted to large flow and low lift In most cases, the interest energy has a continuous rural performance curve, and the flow increases as the head decreases. In use, if there is some factor that causes the back pressure of the pump to decrease, the working point of the pump will shift to the point with large head and flow along with the device curve, which will cause the head to decrease. This is mainly caused by the change of external factors, and has nothing to do with the pump itself. It can be solved by increasing the pump back pressure. 6. Motor reverse Improper wiring results in the motor steering contrary to the actual requirements of the pump. Normally, observe the rotation direction of the pump when starting. If it reverses, exchange any two wires of the terminal on the motor. Why do pneumatic ball valves need stainless steel pipe fittings for connection? Liquid ring vacuum pump Liquid ring vacuum pump manufacturer
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yibocommunal
13 de set. de 2022
In Biografias e Obras
Construction of modern tubular heating furnaces There are three types of linings commonly used in modern tubular heating furnaces: brick structure, refractory fiber spray structure and castable structure.Improvement of Soft Magnetic Properties of FeCo Alloys by Vacuum Heat Treatment brick structure Brick lining is made of refractory bricks, including standard refractory bricks and special-shaped refractory bricks. The advantage is that different types, properties and grades of refractory bricks and refractory mud can be selected according to the working temperature, working conditions and heat load of different parts of the heating furnace. The disadvantage is that the integrity and sealing of the furnace lining are poor, and the construction efficiency is low.Vacuum Sintering of Alumina Ceramics Refractory fiber sprayed structure Refractory fiber spraying is to send the pretreated bulk fiber cotton out of the spray gun at high pressure through a special fiber spraying machine, and at the same time, through several sets of special fluid conveying equipment, the inorganic binder is evenly sprayed into the fiber cotton through the outer ring of the spray gun. The external mixture is sprayed onto the inner wall of the furnace.Vacuum Heat Treatment of 42CrMo Steel High Strength Bolts The advantages of refractory fiber spraying construction technology are fast construction speed, seamless lining and good air tightness, which is especially suitable for the construction of complex and special-shaped furnace walls.Metal injection molding vacuum sintering furnace
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