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Talking about Pump Drainage Automation (with photos)
In excavation of deep foundation pit and other deep excavation projects, due to the seepage of foundation pit, a large amount of stagnant water must be pumped to the lower reaches of the riverbed by pumps to control the water accumulation at the lowest water level (bottom valve Office) above. If more pumping, the pump body will be filled with a large number of gas and idling can not be on the water, which will endanger the safe operation of the pump, resulting in energy loss. In construction practice, in order to ensure the control of the minimum water level, you must: ①adjust the pump valve to control the flow, to prevent water pumping body pump; ② close the pump valve, the water level below the minimum water level when the man-made shutdown . Based on the above two situations, in the existing equipment, only add some accessories and circuits, so that light-duty pump can run at full capacity, so as to achieve the purpose of reducing labor intensity can automatically control, but also reduce energy consumption and reduce engineering investment. 1 pump automation control components 1.1 Magnet float water level signal Magnet float water level signal is basically composed of a float, conduit, reed pipe and the outer tube and other components. Reed switch is the two pieces of iron-nickel alloy reed closed in the glass tube, the normally open reeds were fixed at both ends of the glass tube, the role of the permanent magnetic field, the reed is magnetized, the free end of the magnetic Just the opposite, the use of "the opposite sex phase suction" principle, to overcome the reed moment, reed action, so that the circuit is closed, when the permanent magnet away from the reed pipe, the reed is disconnected. Float is a built-in permanent magnet floating plastic ball. The water level rises and falls to make the float change correspondingly, the magnetic force of the permanent magnet causes the reed contact in the conduit to act, send out the corresponding water surface signal, the water level annunciator principle sees Fig. 1. 1.2 shows the annunciator shows the annunciator principle shown in Figure 2. When the tube flow is greater than the signal flow rate of the provisions of the action, the target and the target rod force and drive the micro switch, so that normally closed contacts open, normally open contacts closed, a normal signal; when the tube water flow decreases , The moment of action on the target rod also decreases. When the flow rate is less than the setting of annunciator action, the normally closed contact of the micro switch is closed, and the normally open contact is disconnected to give an alarm signal. 1.3 automatic water level detection and display circuit 1.3.1 water level detection circuit diagram If the corresponding changes in water level can be displayed by the signal light, the water pump to stop providing a good monitoring. Figure 3 is the automatic control of water level and display circuit. 1.3.2 Automatic water level detection and display circuit principle When the water level changes in the water level signal to the float to move to the lower water level position, the float near the lower limit of the magnet reed 0G, reed pipe in the nickel-iron alloy sheet Affected by the magnetic force, normally open contacts closed. See Figure 1 and Figure 3. Road, OZJ relay coil power, the relay pull, OZJ normally open contact closed, normally closed contact open, the current through the A point → 1ZJ normally closed When the water level reaches a low water level, the float magnet close to the low water level Reed 1G , 1G normally open contacts closed. Current through the A → 1C signal light indicates that the water level is at a low water level. And so on, 2G closed, 1XD signal light off, 2XD water level signal light, said the water level in the water level. 3G closed, 2XD signal light off, 3XD high water level signal light, remind operators to pay attention to equipment safety. 2 automatic water level control 2.1 submersible pump automatic, manual drainage diagram (see Figure 4). (1) submersible pump automatic control circuit, shown in Figure 5. Submersible pump automatic drainage simple and reliable, unattended guard operation can be achieved for water seepage, water volume is not large low-lying areas. (2) submersible pump automatic, manual drainage principle of control circuit shown in Figure 5. Close the HK switch, open the ZK switch is manually drained, the principle is simple, not repeat them. 2.2 bottled valve irrigation centrifugal pump automatic control (1) at the end of the valve centrifugal pump automatic irrigation diagram shown in Figure 6. Make a water tank for centrifugal pump irrigation, so that the pump body is always filled with water. Pump suction diameter of 300 mm below the small pump can be set in the suction pipe at the end of the valve, open the pump before the pump to start irrigation, equipment and methods are relatively simple. As the water pipe head loss greater, and the end of the valve is easy to impurities, sediment and other obstruction and lax, affecting the irrigation started, need to be cleaned often, it is only applicable to small pumps. Each centrifugal pump outlet pipe generally placed on the check valve, when the head is below 20 m, no check valve. (2) automatic water tank water control circuit design shown in Figure 7. To ensure that there is a sufficient amount of water in the tank for the centrifugal pump to irrigate, the volume of the tank should be filled with at least one centrifugal pump, and an anti-corrosion treated open tank can be used. How it works: current through the C phase → TA button → ZK switch → C1