Because the submersible pump cable fixed way is not correct, the water flow caused cable and boom long-term friction when submersible pump running, resulting in damage.submersible pump running in the motor coil will heat, the motor internal temperature is high, submersible pump After stopping the operation, the internal temperature of the motor chamber will drop, the motor outside the water will be broken from the cable along the cable was sucked into the motor inside, because the number of submersible pumps and the time is not the same, so the degree of water leakage inside the submersible motor Different. But also because the drainage station is running a small number of times each year, and each time the operation is also short, and the submersible pump is insulated, the electric coil is not short-circuit burned, but the motor internal water, the motor is running unbalanced, causing the motor running current higher, seal damage, oil leakage.
As the cable damage caused submersible pumps in the motor leakage is a more common accident, we should be targeted to take preventive measures.
Now submersible pump has been widely applied to various industries, but for the newly purchased submersible pump, it is a little puzzled to add water before using. When we open the submersible pump, in the product manual on the use of water before the request, many people think that the submersible pump working environment is in the water, before the use of water operation, is simply superfluous. As a professional production of submersible pump manufacturers, here to tell you, since manufacturers have to explain the water in the submersible pump can be operated, then we can do as long as we do, do not ignore this step, otherwise it will cause diving Damage to the pump.
Submersible pumps are placed in the water, the process of running will produce relatively large heat. 2900 revolutions per minute of the motor, the heat generated by the operation is very large, and the heat pump is distributed in the motor inside the internal, in order to alleviate this heat, which requires the motor in the external cavity filled with water, and then reach Use water to cool the motor for the purpose of preventing the motor from occurring during the operation of the machine. The water we add here is not to add water to the inside, but to the inner part of the motor, which is part of the maintenance of the submersible pump.
Submersible pump consists of: water pump, submersible motor (including cable), water pipes and control switch composed of four parts. Submersible pump for the single-suction multi-stage vertical centrifugal pump; submersible motor for the closed water-filled wet, vertical three-phase squirrel cage asynchronous motor, motor and pump through the claw or single-button coupling directly; equipped with different specifications Three-core cable; starting equipment for different capacity levels of air switch and auto-decompression pneumatic, water pipe for the different diameter of the steel pipe made of flange connection, high-lift pump with gate control.
The upper part of the submersible motor shaft is equipped with a labyrinth sand control and two return-mounted skeletal seals to prevent flow sand from entering the motor. The submersible motor adopts water lubricated bearing, the lower part is equipped with rubber regulating film, regulating spring, regulating the pressure chamber, adjusting the pressure change caused by the temperature; the motor winding adopts polyethylene insulation, the nylon sleeve sets of water resistant magnetic wire, Cable connector technology, the connector insulation off scraping paint layer, were connected, welding firmly, with raw rubber around a layer. And then wrapped with waterproof adhesive tape 2-3 layer, the outer layer of 2-3 layers of waterproof tape or glue adhesive layer of rubber (bike tires) to prevent seepage.
Submersible pump Each stage of the baffle is fitted with a rubber bearing; the impeller is fixed on the pump shaft with a vertebral sleeve; the baffle is threaded or bolted. The high-lift submersible pump is equipped with a check valve to avoid downtime. Motor sealed, the use of precision stop bolts, cable outlet plus pads for sealing. There is a water injection hole on the top of the motor, there is a vent hole, the lower part of a water hole. The lower part of the motor is equipped with upper and lower thrust bearings, thrust bearings on the groove for cooling, and its grinding of stainless steel thrust plate, to withstand the upper and lower axial force pump.
Miniature submersible pump is small and light, it plays an important role in the rural production. So what should be paid attention when use it?
1. When installing a small submersible pump, the cable should be overhead, where the power cord should not be too long. Do not allow the cable to force the unit to avoid causing the power cord to break, submersible pumps do not sink into the mud, otherwise it will cause poor heat to burn the motor windings.
2. Try to avoid starting submersible pump in the low voltage, the power supply voltage and the rated voltage can not be a difference of 10%, the voltage is too high will cause the motor overheating and burn the winding, the voltage is too low, the motor speed, such as less than 70% of rated speed, Start the centrifugal switch will be closed, resulting in a long time to start the winding power and heat even burn the windings and capacitors. Do not frequently switch the motor, this is because the pump will stop when the return flow, if the boot immediately, will start the motor load, resulting in starting the current is too large and burn the winding.
3. Do not make the pump overload operate for a long time, do not smoke water with large amount of sand, the pump dehydration operation time should not be too long, so as not to overheat the motor and burned. In the operation, the operator must observe whether the operating voltage and current are within the values specified on the nameplate at any time. If the motor is not in compliance, the motor should be stopped to find out the cause and eliminate the fault.
1.Check whether the pump and pulley have wear and damage, if necessary, should be replaced. Check whether the pump shaft is bend and whether the journal wear and shaft thread is damaged. Check whether the blade on the impeller is broken and whether shaft hole wear is serious. Check the degree of wear of the water seal and the bakelite washer, such as exceeding the use limit. Check the bearing wear, the table can be used to measure the bearing clearance, such as more than 0.10mm should replace the new bearings.
2.When the submersible pump removed, broke down it in order. After the decomposition of parts should be cleaned, and then check one by one to see if there are cracks, damage and wear defects, such as serious defects should be replaced.
3.Water seal and seat repair: water seal, such as wear from the slot, can be used abrasive wear, such as wear and tear should be replaced; water seal seat if rough scratches, can be used flat reamer or repair in the lathe. Replacement of new water seal assembly during overhaul.
4.When the pump with the following damage, it allowed to repair: the length of 30mm or less, does not extend to the bearing hole hole cracks; and the cylinder head to connect the flange has broken parts; oil seal hole damage. Water pump shaft bending should not exceed 0.05mm should be replaced. Impeller blade damage should be replaced. Water pump shaft wear should be seriously replaced or set of repair.
5.Check whether the pump bearings are flexible or has abnormal sound rotation, if the bearing has a problem, it should be replaced.
6.When the pump is assembled, turn with hand, the pump shaft should be without stuck, impeller and pump shell should be without rubbing. And then check the pump displacement, if any problems, should check the reasons and exclude. If the pump fails, the coolant will not reach the corresponding place, its performance will not be effective play, and ultimately affect the work of the engine. Therefore, it is necessary to strengthen the inspection of the pump.
The concentricity of the pump is the coaxial degree of taking motor shaft as the active shaft and the pump shaft.
When the pump and the motor shaft concentricity deviation is too large, the pump will be harmful. Long-term operation of the pump and the motor shaft is not the heart of its bearing (or bearing) will be serious wear and tear caused by equipment damage; pump and motor shaft heart will also make the pump running noise and vibration, shorten the pump life, and affect the pump efficiency.
Therefore, the concentricity of the pump should be carefully installed during the test adjustment.
Submersible pump has a certain degree of self-priming ability, then how should we improve its capacity?
First, the submersible pump set vacuum pump in the pump suction pipe , before submersible pump start, the vacuum pump start first, so that the pump suction pipe first filled with water to ensure that the pump automatically and quickly start. This method of water needs to have a sound automatic control system to ensure the normal work.
Second, this is simple relative to the others: no clogging submersible pumps to reduce the water pipe bend, drop height and horizontal interval.
Third, this approach requires a suction pipe in the pump set up a suction pump, before the first running should be filled with artificial water, the first stop after the operation, due to the height of the intake pipe suction tube height above the water surface , Even though the water level inside the tank is lower than the height of the water inside the tank, the water inside the tank will not flow back.
The last, install suction valve at the end of the submersible pump suction pipe. Siphon valve is actually a kind of check valve, which ensures that the water flow into the suction pipe only from the pool and can not be back, so if the suction pipe filled with water, although the water pump axis elevation above the pool water level, but because of the suction valve, the water will not sink into the pool, so that the suction pipe has been covered with water, to ensure the pump automatically and quickly start.
Submersible pump structure, materials and auxiliary systems due to the emergence of cooling problems, put forward higher requirements, also noteworthy is the ketone, ester, ether for a variety of equipment solubility, so Nanjing lanshen Pump Corp.LTD. explain the cooling problem of submersible pump:
1.The media which temperature is below 120 ℃, submersible pumps are usually not set up a special cooling system, will use its own media to lubricate and cool;
2.For medium which temperature between 120 ℃ and 300 ℃, usually it will be equipped with cooling chamber in the pump cover, sealed chamber should also be connected to the cooling fluid, to be equipped with double mechanical seal;
3.For medium which temperature more than 300 ℃, not only the pump head part of the need for cooling, suspension bearing room should also be equipped with cooling system, submersible pump structure is generally the central support form, the best mechanical seal metal bellows type;
4.The maximum temperature when use submersible pump can up to 200 ℃.
5.Submersible pump life problems, material pitting corrosion problems, static sealing reliability issues are noteworthy, should be injected into the sealed cavity isolation fluid, the pressure is generally higher than the medium pressure 0.07 ~ 0.1MPa.
The above content is introduction of submersible pump cooling problems, in the grasp of these will help us to use better and improve the efficiency of work.
Submersible pumps can be known from the name, the application of equipment in the water.
Submersible pumps in some ways, is a machinery and equipment absolutely not the lack.When use submersible pumps to start work, but also to comply with the operation of the submersible pump specifications and the terms of some of the instructions. Otherwise, there is no way to submersible pumps such equipment function fully reflected, and submersible pumps in daily operation, often a whole group of mechanical equipment into the deep water to start work.
The role of the submersible pump is extremely important, the complex is the land below the water raised to the ground, to provide people with daily drinking water use, belongs to the life of water, mine rescue, industrial cooling, irrigation, Sea water upgrade, ship transfer in the core facilities, can also be used for fountain landscape, hot water submersible pump for hot spring bath.
First, because the load of submersible pump is more heavy relative to the general pump, supporting the motor rated current is relatively large. Therefore, the choice of inverter to the motor rated current according to inverter rated current to be selected, not just just power matching;
Second, pay attention to the installation and environment, for the installation of the pump station and other relatively wet site to do the protection of the inverter. For example, to strengthen the PCB circuit board insulation protective paint processing, screw sheet metal parts of the protective treatment, and place the control box to use.
Third, the general depth of submersible pumps in about 100 meters, the inverter to pump the distance between the far. Therefore, in the course of the cable diameter to consider thickening to reduce line losses, matching output line reactor to reduce leakage current, the appropriate increase in inverter selection to compensate for power attenuation. In particular, non-clean pump impurity should be increased selection, not in the water load current is great.
Fourth, regular inspection and maintenance, the pump group to see whether the appearance of aging, sealing for leakage, for insulation measurement. The frequency changer also must carry on the regular inspection, the clean-up, guaranteed that can the good work. For, require no interruption of the occasion to make use of standby emergency control circuit to prevent the inverter status and cause downtime.
Fifth, good grounding is the foundation to stablly and reliablly operate, do not have a reliable ground in the case of the inverter can be considered not grounded. Do not use the ground as a ground wire to the ground terminal of the inverter. Do not connect the ground of the motor to the ground of the inverter.
Sixth, in order to safety, in many occasions in rural areas are using the leakage protection switch, if the leakage protection selection improper adjustment by the inverter leakage current will trip the phenomenon. At this point, you can consider the installation of the reactor or reduce the input carrier frequency, conditional considerations to install the output reactance, reduce harmonic current.