Drainage pumps used in buildings are submersible sewage pumps, liquid sewage pumps, vertical sewage pumps and horizontal sewage pumps.
As the general site of the building is small, the displacement is not large, the drainage pump can give priority to the use of submersible sewage pump and liquid sewage pump, which liquid sewage pump is generally used in important places; vertical sewage pump and horizontal sewage pump requirements set Earthquake foundation, self-irrigation, and occupy a certain site, so use less in the building.
1.Use low noise water pump.
2.The pump unit should be set vibration device, the base should be installed under the rubber vibration pad, rubber vibration isolator, rubber shock absorber, spring shock absorber and so on. Refer to “Waterproof and installation of water pump and its installation Atlas” SS657.3, in the pump suction pipe and outlet pipe, should be set up vibration devices, such as flexible rubber joints.
4.Pipe stents and pipes through the wall, wear floor, should take anti-solid sound measures, such as the pump room with flexible hanger, elastic bracket or in the wall through the pipe and hole between the glass fiber.
5.If necessary, can be taken on the building sound insulation and sound absorption measures, such as the pump room with double glass doors and windows, walls, ceiling installation of porous sound-absorbing panels.
6.The basis of vibration isolation, pipe vibration isolation and vibration isolation vibration isolation area of the number of layers, the number and number of flexible joints must be calculated.
7.Fire dedicated pump.
Frequent use of submersible pump users will have encountered more or less tripping, then you will get the relationship between electricity, this must be caused by a short circuit, this is also a reason. In addition to a lot The reasons for the impact of submersible pump trip, you are not stable current or submersible pump switch bad contact and so on. But sometimes we found that these reasons are not.
There is also a problem with the cable of the submersible pump. Current transformer polarity is connected correctly. After troubleshooting the cause of the equipment failure and wiring errors, the differential protection operates during motor start, indicating that the differential current in the differential circuit exceeds the differential relay setting during this process. Above can be regarded as often cause submersible pump failure reasons, we can follow a certain order, overall troubleshooting first, then troubleshooting partial.
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 submarine 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 tire) to prevent water seepage.
After the hub of the pump assembly coupling is assembled on the shaft, the vertical and coaxial degrees of the hub and the shaft should be carefully checked. Usually in the hub of the end and the outer circle set up two dial indicator, turning the wheel when the rotation, observe the hub of the whole beating (including the end of beating and radial run) values, determine the vertical axis and the axis of the axis and coaxial The situation of the situation. Different speed coupling of the requirements of the whole beating different values, different types of coupling on the requirements of the whole beating are also different, but the wheel assembly on the axis after the hub must be the total beating deviation of the value of Design requirements within the tolerance range, which is one of the main quality requirements of the coupling assembly.
Pump assembly caused by the hub of the total beating value does not meet the requirements of many reasons, the first may occur in the manufacturing process due to the error caused by processing for the field assembly, mainly due to correct the wheel hole surface treatment is not correct, so that the hub and axis concentric The degree of deviation. Another reason is that there is a key coupling in the assembly, due to improper assembly of the key caused by the hub and the shaft different axis. The correct installation of the key should be the key side of the key and the keyway wall tightly fit, usually in the assembly with color inspection, with a bad time can be used to repair the file or blade to meet the requirements. Key upper part of the general gap, about 0.1-0.2mm or so. High-speed rotating machinery for the hub and the axis of the coaxial degree of high demand, with a single bond can not get a high degree of coaxial, with double bond or spline connection can make the coaxial degree of both improved.
The minimum submerged depth of the pump is a prerequisite for proper operation of the pump. The samples on the factory are marked with clear data. The Panda pump indicates that the data is calculated on the basis of:
1. According to the pump’s abundance allowance calculation, to ensure that the pump does not occur cavitation.
2. For submersible pumps in the upper part of the motor, if the motor cooling cycle is not installed, the entire motor is immersed in water to cool the motor stator.
3. The minimum submerged depth is to ensure that the pump running, the sink does not occur in the whirlpool, the air is not involved in the import of the pump, and to ensure that the liquid flow into the pump evenly distributed.
Moreover, Nanjing lanshen Pump Corp.LTD. found that some pumping stations due to the flow and inhalation pool conditions are limited, the pump running after the change in the water level is very large, inhalation tank water level, resulting in the actual submerged depth below the minimum submerged depth, resulting in the pump can not run properly, Cavitation. Such as a pumping station, suction pool minimum water level elevation of 1m, up to 4.5m, water depth difference of 3.5m. If the pump station is designed according to the 1m elevation, the whole pumping station is dug deep and the elevation design is raised. The submerged depth is less than the minimum submerged depth.
Many industries will use submersible pumps, agricultural irrigation will also use submersible pumps, but the use of agricultural irrigation submersible pumps and most industries, after all, will be different. Now used to irrigate the drains of the land has been rare, but rather the more common submersible pumps for land irrigation, we will look at the use of agricultural submersible pump requirements.
Suitable for agricultural irrigation submersible pumps when installed, the pump should be ramped to reduce the elbow, or install the volute turn, so that the outlet can be facing the pool. As far as possible to shorten the submersible pump pipeline, we remove one meter of steel pipe, ten hours of irrigation work we can save 0.21 kg of diesel, a long time the greater the amount of diesel fuel savings, try to expand the submersible pump outlet diameter , If we put a four-meter-long 10 cm water hose into a 15 cm pipe, we can save 0.5 kg of petrol per ten hours.
In the submersible pump water can be kept clean, we can remove the filter. In order to prevent the impeller ring and axial clearance is not appropriate, we are in use, should be based on the submersible pump pump factory instructions to adjust, for submersible pumps in the pipeline blockage, we have to promptly clear, so as not to affect the submersible pump Normal work to prevent the submersible pump into the gas pump, because the pump intake will reduce the pump water, in order to prevent this situation, we should be in the submersible pump to check the various parts of the maintenance.
Crankshaft is an important part of the submersible pump, in the course of the use, it is often damaged, how to try to maintain its life, as we urgently need to solve the problem, then we introduce the submersible pump crankshaft daily maintenance measures:
1.Submersible pump crankshaft normal operation of the submersible pump every 8h maintenance time, by the shift pump workers, every 2h tour check a submersible pump and motor operation.
2.Check the submersible pump oil is in line with the requirements, there are problems in a timely manner to add or replace, to ensure that the lubrication of the normal work.
3.Check and adjust the submersible pump packing letter, and to ensure that the fixed, connecting bolts without loosening.
4.Check the unit vibration operation without abnormal sound, should meet the requirements of this standard, the instrument action sensitive and accurate.
5.Submersible pump crankshaft equipment to deal with leakage and do a good sanitation work.
The above is about the submersible pump crankshaft daily maintenance of the relevant matters related to the introduction, in the daily use of attention to these points will be able to ensure the normal operation of the submersible pump to extend its service life.
At present, China’s low-end pump industry has been basically realized in the field of domestic, high-end areas also by virtue of cost, service and other advantages to achieve the gradual replacement of imported products, and is committed to the pump industry, international competition. But in the impact of internal and external factors and many uncertain factors under the impact of domestic-funded enterprises in order to achieve the simultaneous development of the market, need to speed up the casting of “domestically produced advantages” in order to counter the international giants of flooding the pump market in China.
China’s pump industry is now in a relatively favorable demand for the development period, but also because of this many companies are trying to valve enterprises to expand the scale to achieve long-term or sustainable growth. At the same time, China’s pump industry has also ushered in a lot of new subjects to join. However, it is precisely because the collision between the two sides led to a “big but not strong,” the status of the pump industry.
From this, China’s pump industry in order to achieve sustainable development, expansion of enterprise scale is on the one hand, strengthen enterprise technology research and development and product development capability is the key. In other words, in the homogenization of the more serious at this stage, in order to maintain or stimulate the development of an industry must be to differentiate the competitive advantage to support, and “differentiated competitive advantage” is necessary to meet the current economic development needs But also to meet the target market demand, so as to achieve a sustainable development of China’s pump industry.