After assembling the hub of the pump on the shaft, the verticality and concentricity of the hub and the shaft should be carefully checked. Generally, two dial indicators are arranged on the end surface and the outer circumference of the hub. When the disk drive rotates the shaft, the value of the full run-up (including the end runout and the radial runout) of the hub is observed to determine the perpendicularity between the hub and the shaft and the coaxiality Degree of the situation. Different speeds of the coupling requirements of full beating different, different types of coupling requirements for full beating also vary, but after the assembly of the hub in the shaft, you must make the hub full runout deviation in the Within the design tolerances, this is one of the major quality requirements for coupling assembly.
Submersible pump assembly caused by the wheel full run-out value does not meet the requirements for many reasons, first of all may occur in the manufacturing process due to the error for the field assembly, mainly due to improper handling of the hub hole surface modification, the hub and shaft concentric Degree of deviation. Another reason is that when a keyed shaft coupling is assembled, the hub and the shaft are not coaxial due to incorrect key assembly. The correct installation of the key should make both sides of the key and the keyway closely fit the wall, usually with the paint color inspection assembly, with the bad file can be used to repair the file or blade to meet the requirements. The upper part of the key generally gap, about 0.1-0.2mm or so. High-speed rotating machinery requires high concentricity between the hub and the shaft. High concentricity can not be obtained by a single-key connection. Concentricity can be improved by using a double-key connection or a spline connection.
The pump transmits the mechanical energy or other external energy of the prime mover to the liquid to increase the liquid energy, which is mainly used to transport the liquid including water, oil and acid-base liquid. Pumps are divided into different categories according to different conditions, and each pump has its own unique method of use. Now we will explain why the centrifugal pump to close the valve start, and axial flow pump to open the valve to start. The reasons are as following:
1.Centrifugal pump power performance curve is a slow rise of the approximate straight line, the minimum shut-off power, in order to start and stop light load, solid start and shut down before shutting down the first outlet valve;
2.The axial pump power performance curve is a rapid decline of the convex convex parabola, the maximum power to turn off the death, in order to avoid wrong operation caused serious overloading of the power machine, axial pump pumping device does not allow any valve.
Coupling of the transformation. After comparison, the coupling was improved. And the positioning of the half-ring with the positioning of the shaft, the shaft is driven by the key, half-card ring and up and down the axis to match, to ensure that the upper and lower axis positioning, the upper and lower shaft axial size can be through the fit The radial dimension of the shaft is mainly ensured by the coupling accuracy of the sleeve and the upper and lower shafts and the axial positioning of the retaining ring, as shown in Fig. This is a better method of jointing, reducing the length of the rotor, limiting the verticality, strong, eliminating the rotor up and down the movement problem, improve the stability of the operation. Reconstruction of the middle of the pump. After accounting, we put the liquid pump liquid from the original length of 3600mm to 3000mm shortened, shortening each segment 200mm, support spacing reduced, greatly improving the rigidity of the rotor, the hub of the rotor Ye Lun found pendulum is 0.45 ~ 0.7mm, the guide satisfies Bearing on the deflection angle requirements. In order to ensure that the depth of the suction in the same, in the suction port to increase the length of the suction pipe. Increase throttle device. Add a long throttling bushing behind the impeller to reduce the pressure behind the impeller and open four ¢ 50mm holes in the support tube to increase the leakage of the media at the support tube.
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.