Overview, classification and structure use and mai

2022-10-15
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Submersible pump overview and classification and structure use and maintenance

submersible pump is a water treatment tool with a wide range of uses. Different from ordinary water pumps, they work underwater, and most of them work on the ground. Before starting the pump, the suction pipe and pump must be filled with liquid. After the pump is turned on, the impeller rotates at a high speed, and the liquid in it rotates with the blades. Under the action of centrifugal force, it flies away from the impeller and shoots out. The speed of the emitted liquid in the diffusion chamber of the pump shell gradually slows down, the pressure gradually increases, and then flows out of the pump outlet and discharge pipe. At the center of the blade, the liquid is thrown around to form a vacuum low-pressure area without air and liquid. The liquid in the liquid pool flows into the pump through the suction pipe under the action of atmospheric pressure on the pool surface. In this way, the liquid is continuously pumped up from the liquid pool and continuously flows out of the discharge pipe

submersible pump - overview of machinery

the submersible pump on the working face is a general-purpose machine. Its working principle is that the motor drives the impeller to rotate at high speed through the pump shaft, works on the liquid, and converts the mechanical energy into liquid energy, so as to transport the liquid for repair and maintenance, and clean the experimental machine device to the destination. The history of water pump is very early. The common centrifugal pump was as early as 1689, when French physicist baben made the test model. With the advent of motor, centrifugal pump has been widely developed. Submersible pump appeared relatively late, and the first submersible electric pump appeared in 1928

submersible pump is a water lifting machine with a motor and a water pump directly connected into the water. It is suitable for extracting groundwater from deep wells, as well as for water lifting projects such as rivers, reservoirs, canals, etc; It is mainly used for farmland irrigation and human and livestock water in plateau mountainous areas. It can be used for water supply and drainage in cities, factories, railways, mines and construction sites. The motor and water pump are integrated, which can operate safely and reliably in the water. There are no special requirements for well pipes and lifting pipes (that is, steel pipe wells, ash pipe wells, earth wells, etc. can be used; under the permission of pressure, steel pipes, rubber pipes, plastic pipes, etc. can be used as lifting pipes)

the submersible pump is easy to install, use and maintain, and covers a small area, so there is no need to build a pump room. Simple structure, saving raw materials. The submersible pump has a compact structure. When working, it can be started by putting the submersible pump into the water. It is simple to install and convenient to move. Because of its simple structure, small volume and convenient use, it has developed rapidly. The design starting point of the submersible pump is non blocking and non winding. Some models are also equipped with a tearing mechanism or cutting device, which can tear the long fibers, bags, belts, etc. in the sewage and discharge them

the inherent weakness of the submersible pump is that the solid medium it pumps is mostly soft, and the sand content in the water is limited to less than 3%. When the sand content is large, it is easy to damage the seal. Once the motor enters the water, the insulation of the bearing and winding is damaged, resulting in the burning of the motor. In addition, submersible sewage pumps only have single-stage pumps, with large flow and low head, which can not meet the requirements of high head and low flow in some mines

submersible pumps - mechanical classification

the development and use needs of well submersible pumps are combined with scientific and technological progress, and there are many kinds of pumps. Submersible pumps can be divided into well submersible pumps, working face submersible pumps, submersible sewage pumps, sand discharge submersible pumps, mining vertical pumps, etc

well submersible pump

the clean water submersible pump is a multi-stage pump, which is mainly used to lift water from the machine well, earth well or reservoir in the clay layer, and is suitable for factory, mine or farmland irrigation. In 1928, the American Byron jakson company developed the submersible electric pump for the first time. In the 1930s, Germany, Britain, the United States, Japan and other countries began to produce deep well submersible pumps. China began to produce NQ agricultural deep well submersible pumps in the 1960s, and then gradually improved to the current JQ deep well submersible pump

face submersible pump

face submersible pump is a small submersible pump (single-stage pump), which is widely used in many places because of its easy installation and use. In 1948, Sweden's sterry Flygt first developed a submersible pump for the working face. In the 1960s, the United States, Britain, Germany, Japan, the Soviet Union and other countries also began mass production. China began to produce submersible pumps for working faces in 1958, developed QY submersible pumps (oil filled type) in the 1960s, QS submersible pumps (water filled type) in the 1970s, and QX and DQX submersible pumps (dry type) in the 1980s. In the late 1980s, the submersible pump on the working face has developed rapidly, and has gradually become large-scale and diversified. Large and medium-sized submersible pumps have been widely used in municipal, industrial and mining areas because of their outstanding advantages, such as simplifying the pump structure and saving the construction investment of pump stations

submersible sewage pump

submersible sewage pump is mainly used to transport industrial wastewater and urban domestic sewage. Its biggest advantage is that it can discharge impurities such as pulp and long fiber. (therefore, it is also called non clogging sewage submersible pump). It is widely used in urban sewage treatment plants, rainwater tanks, pumping stations, flood control, drainage and irrigation, etc. In 1956, Sweden's sterbery Flygt first developed a submersible sewage pump, which reduced the cost of the sewage station by about half. China introduced and produced submersible sewage pumps from Germany in the late 1980s, mainly including WQ, QW and as series products. (according to statistics, the domestic annual output of submersible sewage pumps was about 50000 around 1995.)

sand discharge submersible pump

the first sand discharge submersible pump in China was developed by Professor Shang wangqingwu in 1989. After years of development, the product now produced is the fourth generation of sand discharge submersible pump mining vertical pump. The sand discharge submersible pump is specially designed for the drainage environment rich in sediment in the water. It is a new product to fill the international gap. With the characteristics of high lift and wear resistance, it is suitable for drainage in the environment with a large amount of sediment in the water, such as mining, engineering excavation, rescue and disaster relief, environmental protection and sand removal. When draining water in an environment rich in sediment, its service life is 5 ~ 10 times that of submersible sewage pump and clean water submersible pump

fountain submersible pump

mining vertical pump

mining vertical pump, the fourth generation of new sand discharge submersible pump, is an integrated product of vertical pump and submersible pump, which can be used both as a submersible pump and as a vertical pump. It inherits the advantages of submersible pump and vertical pump, and has gone beyond the concept of submersible pump. It is a veritable two-way pump. According to the development of submersible pumps, mining vertical pumps belong to the evolutionary products of submersible pumps

submersible pump - mechanical structure

structure diagram of mining vertical pump submersible electric pump unit is composed of four parts: water pump, submersible motor (including cable), water pipe and control switch. The submersible pump is a single suction multistage vertical centrifugal pump; The submersible motor is a closed water filled wet, vertical three-phase squirrel cage asynchronous motor, and the motor and the water pump are directly connected through claw type or single key barrel coupling; Equipped with three core cables of different specifications; The starting equipment is air switches with different capacity levels and self coupling pressure reducing pneumatic actuators. The water delivery pipe is made of steel pipes with different diameters, which are connected by flanges. The high lift electric pump is controlled by gate valves

the upper part of the submersible motor shaft is equipped with a labyrinth sand preventer and two framework oil seals assembled in a reverse direction to prevent quicksand from entering the motor. The submersible motor adopts water lubricated bearings, and the lower part is equipped with rubber pressure regulating film and pressure regulating spring to form a pressure regulating chamber to regulate the pressure change caused by temperature; The motor winding adopts polyethylene insulation and nylon household water-resistant electromagnetic wire. The cable connection method is based on the cable joint process. Remove the insulation of the joint, scrape the paint layer, connect them respectively, weld them firmly, and wrap a layer of raw rubber. Then wrap it with waterproof adhesive tape, and wrap a layer of rubber (bicycle inner tire) with waterproof adhesive cloth or water glue on the outer bread to prevent water seepage

a rubber bearing is installed in the diversion shell of each stage of the submersible pump; The impeller is fixed on the pump shaft with a cone-shaped sleeve; The guide housing is connected by threads or bolts. The upper part of the high lift submersible pump is equipped with a check valve to avoid unit damage caused by shutdown water hammer. The motor is sealed with precision stop bolts, and the cable outlet is sealed with rubber gasket. There is a water injection hole, a vent hole and a drain hole at the upper end of the motor. The lower part of the motor is equipped with upper and lower thrust bearings. There are grooves on the thrust bearings for cooling. The stainless steel thrust disc that is opposite to it bears the upper and lower axial forces of the water pump. Submersible pump - mechanical use

sand discharge submersible pump the selection of submersible pump before use is very important. The model of pump should be selected according to the actual situation of water source, working time and pump water volume. First, the lift should be greater than the drop between the water intake and the water outlet; Secondly, the flow of the pump should meet the requirements of drainage and irrigation

(I) requirements for the service environment of submersible pump

1. It can become an open-loop safe and reliable power supply

2. The drop between the outlet pipe orifice and the water surface of the pool should be less than the lift

3. Choose a relatively clean water source

(II) start

1. Submersible pumps below 11 kw are allowed to be started directly. Submersible pumps above 13 kW shall be equipped with a step-down starting cabinet. To protect the safe operation of the submersible pump

2.、 In order to avoid the instantaneous upward movement of the submersible pump rotor and reduce the starting load. When starting the submersible pump, the outlet valve stroke should be closed to 3/4. (leave 1/4 air gap for air bleeding) open it slowly after starting water. The operating point of the water pump shall be controlled at an appropriate position

3. After starting and running. Monitoring and observation of water level changes should be strengthened. Ensure that the submersible pump operates within the working condition range. The submersible pump can not be put into formal operation until it operates stably

4. Five hours after the submersible pump was put into operation for the first time. Stop the machine and quickly measure the thermal insulation resistance. Its value is not less than 0.5m bio based degradable non-woven fabric, tissue attractant biomedical materials, high molecular material drug control release system. Can continue to use

(III) operation

1. The submersible pump should work at the design working point. At this time, the axial force is moderate. The pump efficiency is the highest. The most economical and reliable

2. The submersible pump shall be comprehensively inspected every 8 hours of operation. Whether there is any change in each instrument. Whether the circuit node is heated. Whether the sound is normal. Whether the normal working current is greater than the rated value of the motor nameplate

note that in case of one of the following conditions, the pump should be stopped immediately

1. The working current of the pump is suddenly higher than the rated current of the motor

2. Abnormal water output, intermittent water output. The sediment concentration increases

3. The insulation resistance of the motor is lower than 0.5 megohm

4. The unit has obvious noise and increased vibration

5. Insufficient electric voltage. Less than 5% of the rated voltage

6. One phase of fuse is burnt out

7. The water pipeline is damaged

(IV) stop the pump

before the submersible pump stops. To prevent the backflow of water. Close the valve while cutting off the power supply. Restart time is more than 20 minutes apart

(V) precautions for the use of submersible pumps

1. The power supply must be reliably grounded and installed with leakage protector

2. The outlet pipe should not be bent as much as possible, and the rupture of the water pipe should be found and repaired in time to reduce power loss

3. Add filtration when pumping water from water sources with many sundries

4. Correct the positive and negative poles of the power supply before starting, so as to prevent the water pump from reversing and no water from flowing out

5. When abnormal conditions are found in use, cut off the power supply in time, and continue to work after finding out the situation and recovering

submersible pump - mechanical maintenance

daily maintenance of submersible sewage pump. Check whether the power line is damaged every day. It is absolutely forbidden to launch the submersible pump with leakage. Check whether the water pump body is damaged every day to ensure that the motor does not leak electricity during operation.

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