In short, the more parameters, the better, which is beneficial to the selection of the pump. The pump can transport various fluid media, as well as highly viscous media, media containing solid particles, and media containing fibers. For example, ordinary medium sewage and high sludge content, the packing seal form is directly selected, which has good abrasion, easy replacement and low price.. Sealing methods are divided into mechanical seals and packing seals.

Good adjustment performance and high Grinder Sewage Submersible Pumps efficiency. It is widely used in various industries such as sewage, medicine, daily chemical, papermaking, printing, and food. The mechanical seal has a good seal, but it is expensive.　　Single screw pump provides on-site use medium (viscosity of medium, if medium is sludge, provide content) temperature, flow and pressure when selecting with supplier.

The cost is lower than that of a screw pump. When the medium requires no leakage, the mechanical seal should be used. It is also convenient to replace accessories later. If the flow required on site is small, it is recommended to use a mechanical diaphragm metering pump.　　Secondly, after these parameters are determined, the sealing method of the pump is determined according to the medium used on site.　

Single screw pump is a type of positive displacement pump.The above sewage pumps or screw pumps are only made of metal (cast iron, stainless steel), so they are not suitable for some corrosive sewage containing solid particles (when stainless steel is not suitable).In the environmental protection industry or various sewage treatment, sewage pumps play an increasingly important role.

5 Check the leakage of the shaft seal. The operation of the centrifugal pump can be divided into three steps, namely start, run and stop. After the above preparations are completed, the motor can be started. 2 The bearing is filled with oil, the oil level is normal, and the oil quality is qualified. 6 The direction of motor rotation is correct. 3 Open all the inlet 4" Submersible Borehole Pumps valves of the centrifugal pump.

Note that the idle time of closing the valve should not exceed 3 minutes. After everything is normal, gradually open the outlet valve and adjust it to the required working conditions. After the speed is normal, the outlet valve can be gradually opened and adjusted to the required working conditions. After the speed is normal, check the pressure and current and pay attention to whether there is vibration and noise.. Start: The following preparations should be made before starting: 1

Check the integrity of the pump equipment.First, open all the inlet valves, close the outlet valve, and start the motor. 4 Except for water injection into the pump or water diversion of the vacuum pump, open the air release valve to exhaust. A little dripping water is appropriate for the packing seal

This adjustment method can keep the pipeline characteristic curve unchanged.　　2. When the centrifugal pump is working on the designated pipeline, due to changes in production tasks, the working flow of the pump does not match the production requirements; or when the selected centrifugal pump is running in a particular pipeline, The flow rate provided does not necessarily meet the requirements of the delivery task. The original speed of the pump is n and the working point is M.. The flow rate decreases as the speed decreases, and the power consumption also decreases accordingly, so it is more reasonable from the perspective of energy consumption.　　1. Changing the opening of the valve 　　

 During the operation of the pump, impurities deposited or formed in the sealed cavity must be flushed. Now shaft seal devices generally use mechanical seals. According to statistics, the failure of the mechanical seal causes the failure of the pump to account for more than 50% of the equipment failure rate. Analysis of the cause of mechanical seal leakage. The working principle of the centrifugal pump and the function of the mechanical seal device.

The mechanical seal is one of the main wearing parts of centrifugal pumps, so most of the pump failures are caused by seal failure. When the newly installed (or replaced) mechanical seal is put into operation, the leakage should be within the allowable Self-Priming JET Pumps range. Auxiliary facilities of mechanical seal-flushing device Flushing device is the main auxiliary facility of mechanical seal. Second, the principle of mechanical seal

The mechanical seal is an axial end face sealing device that relies on the pre-tensioning of the dynamic and static ring end face seal pairs by the elastic element and the compaction of the medium pressure and the pressure of the elastic element. In order to reduce leakage, shaft end sealing devices are generally installed at the static and dynamic gaps.

If there are no problems with the structure, manufacturing quality, installation and use of the seal itself, its life span will exceed 8000h. As long as the impeller keeps rotating, the liquid will be sucked and discharged continuously. 3. The end faces of the moving ring are pressed against the end faces of the static ring by the pressure of the liquid in the sealed chamber, and an appropriate specific pressure is generated on the end faces of the two rings and the layer is kept extremely thin

Too high temperature and pump dry running are the direct factors that cause demagnetization. The thrust bearing is wo, causing the inner rotor and the isolating sleeve friction magnetic pump to not run for a long time under certain working conditions, such as evacuation, cavitation, high temperature, etc. So we need to pay attention to avoid all occurrences of pump idling and too high temperature.

In addition, there are other degaussing reasons. If the flow is too small for a long Self-priming Surface Pumps Manufacturers time or the outlet valve is closed for too long during operation, the temperature of the inteal medium of the pump will increase, the lubrication of the pump's bearings will also become worse, and the temperature will be higher. The sleeve will be damaged after a long time. Do not pay attention to cleaning during maintenance, and iron filings are adsorbed The inner magnetism causes the isolation sleeve to wear through; 3.

The axial gap between the inner rotor and the isolation sleeve is too small, causing friction and loss of magnetism. 4. There are many reasons for too high temperature. The inteal cooling/lubrication pipeline will be blocked by dirt, which will cause the temperature of the inteal and exteal magnetic cylinders to rise rapidly, and there is a possibility of loss of magnetism; 2.2019-12-27 Magnetic pump demagnetization is an easy cause of damage.. 1

5. These chemical properties affect the selection of pump materials and pump types. At this time, the corresponding disassembly and inspection should be carried out, and the parts that cause the excessive clearance should be repaired or replaced. The problem of forward and reverse rotation: whether the user will use the reverse pumping when using the gear pump, if necessary, indicate it when selecting the type, and pay attention to issues such as machine seal selection.According to different chemical pump materials, the application fields are classified as follows: 　

The fiber China Surface Pumps Manufacturers is related to the 'rotor' lead of each type of pump, and the allowable fiber medium viscosity is as high as 1,000,000 mpa.The speed and flow rate of vertical single screw pump are linear, and the pump can determine the speed and flow rate. According to the requirements of the working conditions, any type of pump can be manufactured into vertical, inclined, and removable vehicle-mounted pumps.6 Mpa

(60 m head) differential pressure stage, and two leads have a secondary pump pressure of 1. Vertical single screw pump performance: Lishen LG vertical single screw pump, multiple screw pump products. The flow rate ranges from 0. The output pressure of conventional products is 1.

According to the user's medium and physical properties, 'stator, rotor, sheath' and overcurrent components, Shanghai Lishen has developed a relatively complete material system for selection after many years.6 Mpa (60 meters head). The single and double end face machine seals of various sealing materials of dynamic and static rings.2 Mpa ( 120 meters head). 2

The pipeline should be equipped with an independent support frame, and the weight of the pipeline should not be placed on the pump. 2. The outlet pressure is too high and exceeds the rated value. The center height of the new pump is different from the original one. 3. Tighten the bolts as required. Disassemble and polish to the required accuracy and reinstall. Recheck the gasket, re-tighten it, and tighten the diagonal bolts evenly. 3. Fix the pressure after alignment. Just open it. 3. 4. The base and the foundation ground are not fixed. No measures have been taken at the insertion end of the inlet pipe, resulting in 'bottom suction' with the bottom of the fuel tank.

 When the medium is water or water-based liquid, the temperature rise in the annulus area can be maintained at 3-5°C; when the medium is hydrocarbon or oil, the temperature rise in the annulus area can be maintained at 5-8°C. Since the sliding bearing of the magnetic pump is lubricated by the conveyed medium, different materials should be used to make the bearings according to different media and operating conditions. 2. Sliding bearing The materials of sliding bearing of magnetic pump include impregnated graphite, filled PTFE, engineering ceramics, etc.

Demagnetization will not occur when the same poles are close, so it is a good source of magnetic field. Controlling the flow of cooling lubricating fluid When the pump is running, a small amount of liquid must be used to wash Submersible Sewage Pumps Manufacturers and cool the annular gap area between the inner magnetic rotor and the isolating sleeve and the friction pair of the sliding bearing. 4. The isolation sleeve is made of non-metallic materials with high resistivity and high strength, which is very effective in reducing eddy current.

Protection measures When the driven part of the magnetic drive is running under overload or the rotor is stuck, the main and driven parts of the magnetic drive will automatically slip off to protect the pump. The annular gap area between the inner magnetic rotor and the isolating sleeve generates high heat due to eddy currents. When the isolating sleeve adopts a metal isolating sleeve, the isolating sleeve is in a sinusoidal alteating magnetic field,

and eddy currents are induced in the cross section perpendicular to the direction of the magnetic force and converted into heat. 2. Permanent magnets made of rare earth permanent magnet materials have a wide operating temperature range (-45℃~400℃), high coercivity, and good anisotropy in the direction of the magnetic field. The key component of the magnetic drive consists of an outer magnetic rotor, an inner magnetic rotor and a non-magnetic isolation sleeve

Only after the pipe diameter increases, the water flow resistance will decrease, and the flow will increase, and the power consumption will also increase appropriately. The size of the liquid pressure is only related to the height of the head, and has nothing to do with the cross-sectional area of ​​the water pipe.

Therefore, in order to prevent the motor from overloading, it is generally required that the actual pumping head of the pump should not be less than 60% of the calibrated head. ②When the water inlet depth of the water inlet pipe is not enough, this will cause vortexes on the water surface around the water inlet pipe, which will affect the water inlet and reduce the water output. 8.) to reduce the flow and prevent the motor from overloading. If there is dirt such as mud and sand at the bottom of the pool, and the distance between the water inlet and the bottom of the pool is less than 1. If the outlet is above the normal water level of the outlet pool, although the pump lift is increased,

the flow rate is reduced. 2. There are many elbows on the inlet pipe of the pipeline centrifugal pump If more elbows are used on the inlet pipe, it will increase the local water flow resistance. Some operators think that blocking the water outlet and forcibly reducing the flow will increase the motor load. Otherwise, the air will gather, the water output will be reduced or the water will not be able to be pumped, and there will be impact noises.

But as long as Submersible Drainage Pumps Manufacturers is within the rated head range, the pump can work normally no matter how the pipe diameter is increased, and it can also reduce pipeline losses and improve pump efficiency. If installed in this way, the valve cannot close by itself, causing water leakage. The outlet pipe of a regular high-power centrifugal pump drainage and irrigation unit is equipped with a gate valve. 3. When installing the water inlet pipe, the horizontal section is horizontal or upward. In order to reduce the motor load when the unit starts, the gate valve should be closed first and then gradually opened after the motor starts. The smaller the pipe diameter, the greater the resistance, and the greater the loss head, which leads to a decrease in pump efficiency

 The pump and the motor are directly connected coaxially, which is a mechatronics product with compact structure and stable performance. 2. The design of the anti-clogging hydraulic components of the large flow channel greatly improves the dirt passing capacity. It can effectively pass 5 times the diameter of the pump diameter and the solid particles with a diameter of about 50% of the pump diameter. 3. Reasonable design, reasonable supporting motor, high efficiency, low noise and significant energy saving effect. 4.

The mechanical seal adopts hard and wear-resistant tungsten carbide, which is durable and wear-resistant, and can make the pump safe and continuous operation for more than 8000 hours. 5. The pump is a vertical structure, the center line of the inlet and outlet are on the same horizontal line, and the specifications of the inlet and outlet flanges are the same, so installation and disassembly are very convenient. 6. The area is small, and there is no need to build a machine room, which can save a lot of infrastructure costs; add a protective cover to the fan end of the motor, and the whole machine can be placed outdoors.

The main purpose of the pipeline sewage pump: 1. The discharge of seriously polluted wastewater from factories and commercial units. 2. Discharge system of urban sewage treatment plant. 3. Sewage drainage system in residential area. 4. Sewage discharge from hospitals, hotels, and high-rise buildings. 5.

Drainage Surface Pumps Manufacturers for subways, basements, and civil air defense systems. 6. Discharge of thin mud in municipal engineering and construction sites. 7. Water supply system of water company and factory. 8. Sewage discharge from farms or rural biogas digesters and farmland irrigation. 9. Attached machines for prospecting mines and water treatment equipment. 10. Applicable to water supply and drainage of water conservancy projects.