What are the technical characteristics of the micro submersible pump?

The micro submersible pump is directly connected with the pump and the motor, and the small micro submersible pump is even directly installed on the motor shaft, saving many connected parts, the overall size of the pump is shortened, the material consumption is less, and the weight is reduced. Replacing deep well pump reduces the problem of high failure rate of long shaft and improves the reliability of equipment. Simple installation, do not need to build a pump room, civil construction area is small, reduce the infrastructure investment, and the micro submersible pump directly into the water, only need the use of electrical control equipment ground building, convenient use and maintenance. Underwater operation noise is small, it is very suitable for the quiet working environment, such as schools, hospitals, hotels, hall water supply and drainage, etc. Micro submersible pumps operate underwater regardless of the climate and surrounding working environment; easy to conceal and suitable for combat readiness and strategic needs. Using the micro submersible pump to carry water, the depth of water increased, less cavitation problems. The in-mounted submersible motor can ensure that the dry motor micro submersible pump runs for a long time even near the drain suction tank, and there is no need to worry about the burning of the motor. Micro submersible pump may produce leakage, cable water, mechanical seal leakage and other static seal parts failure and other problems, these problems may lead to the whole pump burning or leakage accident.

The submersible motor can be divided into AC and DC two categories according to the different power supply sources. The DC micro submersible pump is only used for warships or other special occasions, less occasions; AC micro submersible pump, a diving permanent magnet synchronous motor is developing, water magnet material, high magnetic permeability, with the development of permanent magnet materials, especially the rubidium iron boron working temperature has greatly increased, the price drops, micro submersible pump using permanent magnet material as a rotor, the rotor without resistance loss, the motor efficiency is high. At present, the submersible is widely produced and widely used, which can be classified according to the different structures and uses of the pump.

1. Except for special occasions, micro submersible pump are generally designed as vertical, according to the relative position of the pump and the motor can be divided into pump type micro submersible pump and pump type micro submersible pump. Pump on the motor part of the pump type, this structure helps to reduce the radial size of the pump, agricultural irrigation and well pump for pump, pump type micro submersible pump motor submerged outside, good cooling conditions, motor bearing can use engineering plastic bearing or rolling bearing, shaft end and bearing seal using skeleton oil seal or mechanical seal, sealing only play the role of sediment and dirty water, the structure is simple. The pump in the lower part of the motor is the lower pump type, because the lower pump micro submersible pump can also work in the shallow water, it is often used in the working surface submersible pump and engineering sewage micro submersible pump. Because the mechanical seal is in the high pressure area, the pressure is often reduced by the mechanical seal by setting the auxiliary impeller, return hole, water dump.

2. Micro submersible pump can be divided into dry type, oil filling type, water filling type and shielding type. Dry motor that process to mass production of ordinary dry three-phase asynchronous motor, often use rubber parts do static seal, mechanical seal for dynamic seal, output shaft part is generally 1~2 single end surface or double end face mechanical sealing, strictly prohibited water into the motor, the production cost is lower, motor efficiency is higher, that is the dry motor micro submersible pump. The oil-filled motor is filled with mechanical oil, which is conducive to the internal heat distribution of the motor, and prevents water from entering the motor to a certain extent, but the manufacturing cost is slightly higher, and the efficiency of the motor is lower than the dry motor. The water-filled motor winding is composed of waterproof electromagnetic wire, which also has enough insulation resistance in water. Therefore, inside the motor can be filled with water or rust lubrication fluid, and the operation efficiency of the motor is lower. Because the hydraulic friction loss of the motor and rotor gap is large, it is usually made into long and thin. Shielded motor on the stator set a thin, sealed the magnetic shield, motor rotor can be immersed in water, the manufacturing cost is higher, complex process, and shielding set under the action of alternating magnetic field may exist additional vortex loss, efficiency and power factors is relatively lower, mainly suitable for no leakage of chemical industry and low noise occasions.

3. According to the discharge mode of liquid flow, the micro-submersible pump is divided into external installation type, internal installation type, semi-internal installation type and tubular flow type. The external mounted micro submersible pump exits directly from the outlet of the pressurized water chamber after inhaling the liquid through the impeller. It has simple structural design and relatively high efficiency. In order to improve the cooling conditions of the external micro submersible pump, the shell of the micro submersible pump is often made into a jacket, and the liquid in the high pressure area of the pump water is introduced into the jacket cooling motor. The internal micro submersible pump absorbs the liquid, through the impeller, through the cooling oil chamber, and through the annular channel surrounding the motor, so that the liquid cooling motor and then flows out of the outlet of the pump, and the efficiency of the whole pump is slightly reduced, but the reliability of the pump is greatly increased. The structure characteristics of semi-inner-mounted micro-submersible pump are between the external type and internal-mounted micro-submersible pump. Usually, the pumping pipe is connected through the motor shell and the shell, which plays a certain role in cooling the motor. The motor of the tubular micro submersible pump is located in the outside of the micro submersible pump, and the pump impeller is installed inside the rotor of the motor, and both become one. The water transported by the pump cothe rotor through the inner wall of the motor rotor. The motor is generally water filling type, with large outer diameter, low height and good cooling conditions.

4. Micro-submersible pump can be divided into single-stage pump and multi-stage pump according to the number of impeller. Small micro submersible pumps and most other micro submersible pumps are single stage pumps, that is, the pump part only a stage impeller, the liquid from the suction mouth after inhalation through the action of an impeller directly discharged from the pump body. Multistage micro submersible pump is mainly suitable for head requires higher occasions, such as long shaft deep pump and well with micro submersible pump, mine water warehouse drainage pump, micro submersible pump suction by the liquid, after the diameter guide blade, reduce speed, increase the pressure energy, and import the second or more level impeller continue to pressure, after the final impeller from the pump body or water outlet.

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