Improve the characteristics of the water absorption pipeline, mainly to reduce the water absorption resistance, save power consumption, increase the water absorption height, and reduce the failure of the bottom valve. The main measures are to choose a larger diameter suction pipe, correctly install the suction pipe, and use a bottomless valve to drain.
(1) Select a larger diameter suction pipe. The use of a larger diameter suction pipe can reduce the flow rate, reduce the resistance loss of the suction pipe, increase the water absorption height, and save power consumption.
(2) Install the suction line correctly. Correctly and reasonably determine the water absorption height to avoid cavitation; reduce the suction pipe fittings to reduce the water absorption resistance; install a straight pipe with a length not less than 3 times the diameter of the suction pipe at the inlet of the suction pipe and the water pump. The water flow enters the water pump at a uniform speed; if a different diameter pipe is to be installed, a reducer with a length equal to or greater than 7 times the diameter difference between the head and the head should be installed; the suction pipe cannot be higher than the water pump inlet.
(3) Use bottomless valve to drain water. The bottomless valve drain is to remove the bottom valve, retain the filter or replace it with a bottomless valve screen. It has been determined that about 70% of the resistance in the suction line comes from the bottom valve, and the resistance not only increases the power consumption, but also reduces the water absorption height, and often causes malfunction. The bottomless valve drainage is filled with water by a jet pump or a vacuum pump. The working principle is as follows: the high pressure valve 8 and the low pressure valve 7 are opened, and the high pressure water in the drain pipe 9 is ejected from the nozzle 4 at a high speed through the water source pipe 5, and flows through the mixing chamber 3, the neck U2 and the diffuser pipe 1 atmosphere. The air in the mixing chamber 3 is ejected with the water flow, a vacuum is formed at the nozzle, and the air in the water pump and the squeegee is extracted. The water in the water absorption well is pressed into the water pump at atmospheric pressure K to achieve the purpose of charging the water pump.
The advantages of the jet pump to achieve no low valve drainage are: reducing the resistance loss of the suction pipe, increasing the water absorption height; eliminating the failure caused by the existence of the bottom valve, saving power consumption; the jet pump has a simple structure and reliable operation. The water in the drain pipe is used as the working water source, and no power equipment is needed; the automatic valve can be used to automate the pump work.
Several problems should be paid attention to when using the jet pump to realize the bottomless valve drainage: When using the jet pump to achieve the bottomless valve drainage, if there is no other water source pipe, at least one pump with a bottom valve should be left in the boudoir to solve the first time. Start-up or pipeline leakage causes the jet pump to have no water source; the high-pressure valve on the water source pipe is preferably a plate-type gate valve, and the valve should be opened when filling the water; the filter screen is preferably replaced with a bottomless valve drainage filter; The nozzle of the jet pump is rusted; the seals should be good everywhere to prevent the jet pump from leaking when it is working, which will affect the water pump's water absorption; it is necessary to strengthen the clean and sedimentation of the ore water to prevent the impurities in the mineral water from clogging the water pump suction port.
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