If there is no safety valve, blindly raise the temperature of the magnet wire, such as 180 ℃, 200 ℃, or even 240 ℃, the probability of explosion will be higher. This is because the winding temperature is getting higher and higher, it will produce saturated steam to provide higher temperature, more heat, will lead to higher and higher vapor pressure, but increased the risk of explosion.
If there is no safety valve, must not simply use the method to improve the temperature of the wire temperature.
In the field, once the concentration of sand is too high, the winding will heat over limit, the electromagnetic wire will quickly aging. After the sediment row, due to “overload injury”, the motor thermal load capacity will be greatly reduced, often in the back row of water, the winding short-circuit breakdown, causing the motor explosion. It is this explosion in the water illusion, confused people, for many years, can not find the reasons for the explosion of submersible pumps.
Submersible pump leakage, if not very serious, generally do not need to deal with, if the submersible pump leakage, but it is necessary to take timely measures. So not only pumping the water is not efficient, and will waste a lot of resources in vain, like the pump with oil ah and so on. This time we can use the exclusion method to find out the reasons, the general reason is that the use of submersible pumps is too long, serious wear, submersible pump seal set bad, or the aging of the sealing device caused. In addition to replacing some of the components of the submersible pump, we can also take simple measures, such as its sealing device is not very good, resulting in this result is a great reason for the loss of elasticity of the seal, this time you can tape a few laps.
1. Installation or maintenance of multi-stage pump shaft and motor shaft size tolerance, causing vibration caused by bearing overheating.
2. The bearing is damaged and the bearing wears to cause the bearing to overheat.
3. Filling Agents, scratching the sleeve to produce overheating affect the bearing.
4. Bearing grease lubricant does not match. Too much will make the bearing overheating.
5. Bearing transparent oil lubricant added too little or leakage, the bearings have to overheat.
6. Lubricant oil tank deterioration or water, but also make the bearing overheating.
7. Bearing cooling water is not enough or interrupted, so that the bearing overheating.
Vertical sewage pump compared with the centrifugal pump, its impeller leaves less flow channel, more convenient to transport with fiber or other suspended impurities in the sewage. So what are the advantages of it? The following is about the advantages of its introduction.
The advantages of vertical sewage pump
1. Compact structure, small footprint. Vertical sewage pump submerged into the liquid, it can be installed directly in the sewage pool, without the need to build a dedicated pump room to install pumps and machines, you can save a lot of land and infrastructure costs.
2. Easy installation and maintenance. Small vertical sewage pump can be free to install, large vertical sewage pump are generally equipped with automatic coupling device can be automatically installed, easy installation and maintenance.
3. Continuous running for a long time. Vertical sewage pump due to the pump and motor coaxial, shaft short, rotating parts of light weight, so the bearing to bear the load (radial) is relatively small, life is much longer than the average pump.
4. There is no problem such as cavitation damage and irrigation. Especially after the operation of the staff to bring a lot of convenience.
5. Vibration noise is small, the motor temperature is low, no pollution to the environment.
Some users may not know the working principle of sewage pump, in fact, it is just a pump and motor connected with the work of the equipment, when used in the same time can be submerged work, compared with the general pump, there will be Greater work performance, and the footprint is relatively small, very easy to use when the large, large sewage pump can be automatically installed, the operation method is very simple in the installation of sewage pump, it can play a greater work Characteristics, of course, the quality of self-test sewage pump is also very important factor, you must know how to do the detection work, for the sewage pump operation methods, selection problems and other aspects of a certain understanding, which will make you better use the sewage pump, but also to check the direction of movement of the rotor, from top to bottom to see if the clockwise direction to run, to meet the normal use of performance, in order to confirm the quality of the sewage pump, Phase operation, if the fuse is found to break the phenomenon, be sure to check the reasons, and then put into use, through this method, there will be a greater use of results.
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.
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.
In response to the customers’ requirements, today we will introduce what is included in the sewage pump measurement accuracy
1.Sewage pump start, diesel engine start, emergency stop, increase or decrease;
2.Electric valve control (control flow);
3.Sewage pump conditions to switch to the implementation of the test process control;
4.Automatic start-up control of the cooling device;
5.Diesel engine water temperature, oil temperature, oil pressure and gear box oil temperature automatic monitoring and alarm.