2 Operation of the water pump unit At the initial stage of the operation of the water plant, the pump unit runs smoothly when it starts, and does not emit any abnormal sound and vibration. The running current and the lifting water amount meet the design requirements. After two years of operation, it was found that when the pump unit was running, the bearing sound was abnormal and the noise gradually increased. At the same time, when the 1 unit is turned on and the electric butterfly valve high pressure water is opened to open the check valve, there is a slight vibration and sound. Along with the increase of the running time of the 1 unit, it was found that when the pump unit was started to open the check valve, the sound became louder and louder, and the vibration feeling became more and more obvious. The temperature rise of the pump bearings and motor is also higher than the other pumps. When the pump is overhauled, the wear of the 1 pump bearing is more serious than that of the other pumps. The fixing bolts of the water chestnut unit are deformed, and even the bearing clip is severely damaged. The deviation between the pump and the motor concentricity is large, and the time after calibration is kept within the month. At the beginning, it is considered that there may be a fault in the check valve. After inspection, 1 check valve did not find any faults and hidden dangers. The foundation is reinforced, and the pump and motor concentricity are corrected to the specified range by the averaging meter, but the concentricity shift still occurs soon after the operation. In the following years, the other pump units have the same phenomenon as the 1 unit, and the valve body of the 1 pump unit is damaged by the vibration of the valve body. 3 The reason for the displacement of the pump is that according to the operation of the unit, each time the electric butterfly valve is opened, the sound of the compressed gas rubbing the wall of the pipe is heard, and when the check valve is opened, the sound of the valve is loud and loud, and the vibration is generated. The entire pumping house is accompanied by an obvious analysis of the vibration and other phenomena. It is determined that the pump displacement and the check valve body are shattered because of the presence of air in the upper water pipe. At the moment when the check valve is opened, the compressed air suddenly releases a severe expansion, which generates a large impact force, and the valve plate of the check valve hits the valve body. As the running time and the number of impacts increase, the pump base is severely displaced and the check valve body is damaged. 4 Gas source in the upper water pipe The water pumping house is equipped with four 10kV 450kW high-voltage motors, designed for 3 and 1 standby. Because the actual load is only the principle that the design operation starts the shortest running time and the longest priority stop time, when the pump starts, the general parking time is more than two days or even longer. Due to the poor airtightness of the electric butterfly valve, the check valve is closed tightly. The water column in the upper pipe of 17.91 meters drops under the action of gravity, causing a negative pressure at the top of the upper pipe below the check valve, and the water column in the pipe breaks to form an air belt. The check valve is tightly closed and the gas cannot rise along the upper water pipe to overflow in the distribution well and can only accumulate on the top of the water pipe below the check valve. After the pump is started, the air in the tube is compressed during the time when the outlet water electric valve and the check valve are not opened. When the check valve is opened, the compressed air in the tube is instantaneously released, forming a huge impact force, so that the check valve plate strongly impacts the valve body. Why is there air in the pipe after two years of operation in the water plant? It is because the effluent electric butterfly valve has been operated for two years; when it is closed, the sealing performance is reduced. The water plant uses the water from the Lancang River, and the source cement sand has many impurities. The sealing ring of the electric butterfly valve is a rubber seal, and the running time is increased. Due to the rust and rubber deformation of the valve body, the valve is not closed tightly, and water leakage occurs. Because the check valve is tightly closed, the water in the distribution well will not be recirculated. Thus, a large amount of gas dissolved in the water overflows due to the negative pressure in the pipe below the check valve. The worse the tightness of the electric butterfly valve when it is closed, the longer the pump unit is out of service, and the more gas in the upper water pipe, the greater the damage caused by the compressed gas on the check valve and the pump unit when driving. 5 Solution In order to make the pump unit run smoothly, it is necessary to eliminate the compressed air in the tube by modifying 5. The principle of transformation is small investment province; easy to install and maintain; simple operation and reliable operation. The solution can be either to eliminate the conditions for forming the gas, or to eliminate the conditions for forming the compressed gas, so that the gas in the tube is released through the other channels before the check valve is opened, and the pump unit and the check valve are not damaged. According to the conditions for eliminating the formation of gas, the following scheme can be adopted to replace the electric butterfly valve. When the electric butterfly valve is not tightly closed, it is maintained or replaced. Due to the frequent switching of the electric butterfly valve and the heavy impurities in the river cement sand, the phenomenon of tight closure will still occur after a long time of use. Repeated replacement or maintenance costs are too high. 5 This solution is uneconomical and undesirable. The program adjusts the installation position of the check valve, and installs the check valve in the same horizontal position of the pump in the deep well. Although this kind of scheme can eliminate the factor of air generated by the backflow of water in the pipe, the amount of reconstruction work is large, and there is no installation position in the deep well, which is not desirable. Before opening the check valve, the solution provides a drain passage for the air inside the tube to discharge the air inside the tube so that it cannot form compressed gas. The solution does not require replacement and movement of any equipment, but only the installation of some small-diameter galvanized steel pipes and gate valves using the original space. The investment province is easy to install and operate with simple operation and reliability. Specific measures Exhaust pipe installation conversion wells are 1.5 meters away from the pumping station. The check valves are installed on the same level in the well. There are enough exhaust pipe installation space in the well. The exhaust pipe is taken out from the top of the pipe. After the pass is applied, only the solenoid valve is installed at the end, which is used as an automatic exhaust passage switch; the other end is introduced into the pump house. 00 floor, from the dragon. 00 layer 1.5 m high installation manual gate valve for manual exhaust. When the pump starts to open the electric butterfly valve, the exhaust starts, and the check valve opens to close the exhaust line. Exhaust pipe selection According to the compressed air friction sound during operation and the running time of the pump, the amount of air accumulated in the pipe is analyzed. It is preliminarily considered that the use of milk and steel pipe as the exhaust pipe is feasible. After being installed on the water pipe on the 1st pipe, it is completely negligible to eliminate the destructiveness of the compressed gas in the pipe. The water pressure and water loss are not formed during the work, and only the compressed air in the upper water pipe is discharged. The electrical control electrical control principle is simple and reliable. Under the premise of eliminating the destructive effect of the compressed gas in the pipe, the control components are not added as much as possible. It is clear that the effluent electric butterfly valve takes 25 to 30 seconds from full-close to full-open. It takes 8 to 10 seconds from the opening of the electric valve to the opening of the check valve, and the selection of the electric butterfly valve opening contactor is often used. The control switch that opens the auxiliary contact as the solenoid valve can achieve the purpose of exhausting. In order to prevent the normal operation of the pump unit due to the failure of the solenoid valve control circuit, only the fuse 12 is installed in the solenoid valve back for electrical protection electrical control. During the process of opening the electric butterfly valve, the solenoid valve is opened to discharge the gas in the tube, and the electric valve is fully opened and the solenoid valve is closed. This control method can eliminate the destructiveness of the compressed gas without causing water loss, the control method is simple, and the cost is low. Exhaust process Electrical automatic exhausting After the pressure of the water pump outlet of the starting pump motor is stabilized, when the water outlet electric butterfly valve is opened, press the 8 ugly valve button or 10 to output a valve opening pulse signal, and the valve opening contactor coil is energized. The normally open contact is closed, the motor is turned forward to open the valve, 1 normally open auxiliary contact is closed, and the exhaust solenoid valve is electrically opened to discharge the gas in the upper water pipe. When the electric valve is fully open, the micro switch 8 is opened, the action is disconnected, the coil of the open contactor 1 is de-energized, the normally open contact is opened, the motor stops running, and the exhaust solenoid valve is de-energized to close the exhaust passage. . Manual Exhaust Process Before the pump unit is turned on, the duty officer opens the corresponding manual gate valve in the pump room to form an exhaust passage. After driving, after the gas in the water pipe is discharged or the check valve is opened, the manual exhaust valve is closed to prevent water loss. 6 After the transformation, the operation has been carried out since the transformation in 2001. When the water pump unit is turned on and the electric butterfly valve and the exhaust solenoid valve are opened, the sound of the compressed gas can be heard, and a large humming sound can be heard. At the moment when the check valve is opened, the valve has no abnormal sound and runs smoothly. Due to the different tightness of the pump unit parking time and the closing of the water-powered electric butterfly valve, the air volume and water volume discharged by a single unit are different, but the method achieves the purpose of eliminating the compressed gas in the tube and avoiding damage to the operation of the equipment. Russia has successfully developed a small-scale sewage filter. Russia has developed a small-scale sewage filter for the purification of wastewater in the electroplating industry and the lithography industry. A fiber-adsorbing material is used by an ion exchange method. Because the fiber adsorption material has a high active surface and strong reactivity, it can fully absorb heavy metals in water, and the effect is more than 2030 times that of the granular ion exchanger. In the synthesis of fibers, increasing the density of the ruthenium groups in the fiber chain, it is possible to add selective adsorption of zinc to nickel by the fibers. 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