What are the maintenance instructions for the magnetic pump?

Magnetic pump is a new product newly developed by Jiangda Pump Industry, which overcomes some shortcomings of gear oil pump,
1. Broken shaft
The magnetic pump shaft is made of 99% aluminum oxide porcelain. The main reason for the fracture of the pump shaft is that the pump runs empty,
2. The lift is insufficient.
The reasons for this failure are: there is air in the conveying medium, the impeller is damaged, the rotating speed is insufficient, the proportion of the conveying liquid is too large, and the flow is too large.
3. The bearing is damaged.
The magnetic pump bearing is made of high-density carbon. If the water supply of the pump is cut off or there are impurities in the pump, the service life of the bearing will be directly affected.
4. Insufficient flow.
The main causes of insufficient flow are: impeller damage, insufficient speed, high lift, blockage of debris in the pipe, etc.
5. The magnetic pump cannot output liquid.
The magnetic pump can not output liquid, which is a common fault of the pump. Check whether the air in the suction pipe is discharged, whether the liquid injected into the magnetic pump is sufficient, whether the suction pipe is blocked by sundries, whether the pump reverses (especially after replacing the motor or repairing the power supply circuit), remove the pump to check whether the pump shaft is broken, and check the moving ring of the pump. Check whether the stationary ring is intact and whether the carbon bearing is closely connected with the pump shaft.

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Maintenance method of centrifugal pump parts

1、 Maintenance method of packing seal
1. Clean the stuffing box of the sewage pump and check the shaft surface for scratches, burrs, etc. The stuffing box shall be cleaned and the shaft surface shall be smooth.
2. Check the shaft runout. The unbalance of the rotor runout should be within the allowable range to avoid excessive vibration, which is harmful to the packing.
3. Apply sealant or lubricant suitable for the medium to the stuffing box and shaft surface.
4. For the packing packed in rolls, first take a wooden stick with the same size as the journal, wind the packing on it, and then cut it with a knife. The knife edge is 45 ° inclined.
5. Fillers shall be filled one by one, not several at a time. The method is to take a piece of packing, apply lubricant, hold one end of the packing interface with both hands, pull it away along the axial direction to make it spiral, and then put it into the journal from the incision casing. It shall not be pulled apart along the radial direction to avoid uneven interfaces.
6. Take a metal shaft sleeve with the same size and material as the packing box or with lower hardness than the shaft, push the packing into the deep part of the box, and apply a certain pressure on the shaft sleeve with the gland to make the packing precompressed. The pre compression shrinkage is 5%~10%, up to 20%. Rotate the shaft for another circle and take out the shaft sleeve.
7. Fill the second and third root in the same way. Note that when the number of fillers is 4-8, the interfaces shall be staggered by 90 °; Two fillers are staggered 180 °; 3~6 pieces shall be staggered by 120 ° to prevent leakage through the interface.
8. After the packing is completed, the gland shall be used for compaction, but the compaction force shall not be too large. At the same time, rotate the shaft by hand to make the assembly pressing force tend to parabola distribution. Then loosen the gland slightly.
9. Carry out operation test. If it cannot be sealed, compress some packing; If the heat is too high, relax it. In this way, it can only be put into use when the leakage is in the form of drops and the heat is not too high (the temperature of the packing part can only be 30~40 ℃ higher than the ambient temperature).
Technical requirements for packing seal assembly of centrifugal pump. The installation of packing seals shall comply with the provisions of the technical documents. If not specified, the following requirements shall be met:
1. Check the radial runout of the shaft at the sealing parts, and the allowable radial runout of the shaft is within 0.03~0.08mm;
2. The diameter clearance between the liquid seal ring and the shaft sleeve is generally 1.00~1.50mm, and the diameter clearance between the liquid seal ring and the stuffing box is generally 0.15~0.20mm;
3. The diameter clearance between the packing gland and the shaft sleeve is generally 0.75~1.00mm, and the clearance around shall be uniform;
4. The diameter clearance between the packing gland and the stuffing box is generally 0.10~0.30mm;
5. When there is a packing bottom ring, the diameter clearance between the bottom ring and the shaft sleeve is generally 0.70~1.00mm;
6. After the packing is compressed, the liquid inlet hole of the liquid seal ring shall be aligned with the liquid seal pipe, or the liquid seal ring is slightly inclined to the outside;
7. For the packing in rolls, first take a wooden stick with the same size as the shaft, wind the packing on it, and then cut it with a knife. The cut is 45 ° inclined.

Why the vacuum unit leaks water

Where are corrosion resistant self-priming pumps often used

The corrosion resistant self-priming pump body is superior to the all plastic self-priming pump in thermal deformation resistance, stress damage resistance caused by thermal expansion and contraction of pipelines, installation reliability and vibration resistance. In the field of self-priming pumps, the sales volume of corrosion resistant self-priming pumps has always been high. So where does this equipment stand on its own? If you want to know this problem, let's first understand its characteristics.
What are the characteristics of corrosion resistant self-priming pump
1. Corrosion resistant self-priming pump is a centrifugal pump with high efficiency and corrosion resistance. With its compact structure, convenient operation, stable operation, convenient maintenance, long service life and other characteristics, it has always been the leader in similar products.
2. It is not only applicable to a wide range of fields, but also affordable and acceptable to many enterprises.
3. The corrosion resistant self-priming pump also has a very strong sewage discharge capacity. With the special internal structure design, the water-saving function is also reflected to the extreme. The self-priming height of this self-priming pump can reach 1 meter, and the self-priming time is also very short.
Corrosion resistant self-priming pumps are found in these places
The most common areas are tea gardens, nursery gardens, large orchards, farms, etc. These places cover a large area, and his help is needed for irrigation, fertilization, pesticide farming and other work. In addition to effectively improving work efficiency, it can also effectively save the cost of raw materials. On the basis of rain and dew, it greatly saves the cost of labor. No wonder there are corrosion resistant self-priming pumps in these places. Of course, in order to achieve such efficiency, the assistance of a rocker nozzle is also needed, so that small raindrops or spray like liquid can appear.

Molecular Pump Operation for Influence of Magnetic Field Environment

Fluoroplastic self-priming pump

 

Fluoroplastic self-priming pump adopts metal shell lined with fluoroplastics, all flow passage parts are made of fluoroplastics alloy, pump cover, impeller, etc. are made of metal inserts wrapped with fluoroplastics by overall sintering and pressing, shaft seal adopts external advanced corrugated pipe mechanical seal, static ring adopts 99.9% aluminum oxide ceramic (or silicon nitride), and dynamic ring adopts tetrafluoroplastics filling material, with excellent corrosion resistance, wear resistance and sealing performance. The inlet and outlet of the pump are reinforced with cast steel body to enhance the pressure resistance of the pump. The actual use shows that the pump has the advantages of corrosion resistance, wear resistance, high temperature resistance, non aging, high mechanical strength, stable operation, advanced and reasonable structure, strict and reliable sealing performance, convenient disassembly and maintenance, and long service life.
The outstanding feature of FZB self-priming pump is its self-priming function. It can pump the liquid below the installation position of the pump, with stable performance and simple operation. You only need to fill the liquid before the first use of the pump, and do not need to fill the liquid after the second and subsequent use. You can start the pump directly. The self-priming height can be determined within 2 to 4 meters according to the density of the medium. It is the choice to replace the bulky submerged pump.
2、 Main purpose:
The flow passage components of FZB fluoroplastic self-priming pump are all made of fluoroplastic and have self-priming function. Therefore, FZB self-priming pump has a wide range of applications, such as pumping corrosive liquid in the underground tank to the target location, pumping the acid and alkali in the acid and alkali tank with no outlet at the bottom to the target location, or for circulation between multiple acid tanks, or for acid unloading, etc.

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Analysis of Common Problems of Magnetic Pump

1. Since the cooling and lubrication of the magnetic pump bearing depend on the conveyed medium, it is prohibited to run without load, and avoid the time and space load running caused by restart after power failure during work.
2. If the conveyed medium contains solid particles, a filter screen shall be added at the pump inlet; if it contains ferromagnetic particles, a magnetic filter shall be added.
3. The ambient temperature of the pump in use shall be less than 40 ℃, and the temperature rise of the motor shall not exceed 75 ℃.
4. The conveyed medium and its temperature shall be within the allowable range of pump materials. The service temperature of engineering plastic pump is less than 60 ℃, and that of metal pump is less than 100 ℃.
Convey liquid without hard particles and fibers with suction pressure no more than 0.2MPa, large working pressure 1.6MPa, density no more than 1600Kg ／ m3 and viscosity no more than 30X10-6m2 ／ S.
5. If the delivery liquid is a medium easy to precipitate and crystallize, it should be cleaned in time after use and the accumulated liquid in the pump should be drained.
6. After the magnetic pump operates normally for 1000 hours, the bearing and end face moving ring shall be disassembled and inspected for wear, and the wearing parts that are not suitable for reuse shall be replaced.

What about vacuum pump oil emulsification?

Treatment of eccentric reducer at inlet of corrosion resistant centrifugal pump

 

With regard to the installation of eccentric reducer on the inlet pipe of the end suction centrifugal pump (i.e. the pump inlet is a horizontal inlet), in the textbooks related to the pump piping standards, it is stipulated that the diameter orientation of the eccentric reducer on the horizontal pipe (the horizontal part is upward or downward) is determined according to the absence of a liquid bag or air bag (in two cases):
1. When the medium is fed into the pump from the top to the bottom, the bottom flat eccentric reducer is used for installation, and there is no liquid bag;
2. When the medium is fed into the pump from bottom to top, the top flat eccentric reducer is used for installation, without air bag;
Generally speaking, it is "flat at the top and flat at the bottom" To find out the reason, first understand one knowledge point: cavitation phenomenon. Of course, if you only do industrial installation, you don't need to know so much, because there are complete and correct installation methods in the instructions of each pump manufacturer, just follow the drawings
1、 Cavitation phenomenon
Working principle of centrifugal pump: the driver drives the impeller to rotate through the pump shaft to generate centrifugal force. Under the effect of centrifugal force, the liquid is thrown to the impeller outlet along the blade flow path, and the liquid is collected by the volute and sent to the discharge pipe. The liquid gets energy from the impeller to increase both the pressure energy and the velocity energy, and the liquid is transported to the work site by this energy. When the liquid is thrown to the impeller outlet, a low pressure is formed at the center of the impeller inlet, which creates a pressure difference between the liquid in the suction tank and the impeller center. Under the effect of this pressure difference, the liquid in the suction tank continuously enters the impeller through the suction pipeline and the suction chamber of the pump.
According to the working principle of the centrifugal pump, the liquid flows into the impeller under the pressure difference (Pa Pk) formed between the suction tank pressure Pa and the low pressure Pk at the impeller inlet. The lower the pressure Pk at the impeller inlet, the greater the suction capacity. However, if Pk decreases to a certain limit value (at present, the saturated steam pressure Pt of liquid at the transportation temperature is the critical value of liquid vaporization pressure), cavitation will occur.
2、 The methods to improve the cavitation resistance of centrifugal pump are:
A. Improve pump structure and reduce Δ Hr, belongs to the pump design problem.
B. To improve the effective NPSH in the device: the main common method is to use the injection head suction device.
In addition, the resistance loss of suction pipeline shall be reduced as much as possible, and the saturated vapor pressure of liquid shall be reduced, that is, the suction pipeline shall be designed with larger pipe diameter, shorter length, fewer elbows and valves, and lower temperature of liquid delivery, which can improve the effective cavitation allowance of the device.
Well, after understanding the above knowledge, let's have a look. What is the role of the reducer? It is used to change the size of pipe diameter. So what's the use of changing the pipe diameter at the pump inlet and outlet? It is mainly used to reduce the flow velocity of the medium in the pipeline, so as to reduce the friction force when the medium flows in the pipeline.
3、 Serious consequences caused by cavitation:
(1) Generates vibration and noise.
(2) The working performance of the pump is affected: when the cavitation develops to a certain extent, a large number of bubbles will be generated, which will block the flow passage, making the flow, head, efficiency, etc. of the pump drop significantly.
(3) The material of the runner will be damaged, mainly due to the fatigue erosion of the metal near the blade inlet.
The horizontal eccentric reducer at the inlet of the centrifugal pump generally adopts the top flat layout, but when the reducer is directly connected with the upward curved elbow, the bottom flat layout can be adopted. The reducer shall be close to the pump inlet. The reason for flat top installation is to prevent gas from accumulating in the eccentric reducer and entering the centrifugal pump to cause cavitation damage to the pump. When the inlet diameter of the horizontal suction centrifugal pump is changed, the top flat installation is adopted for the pipeline to enter the pump from bottom to top, and the bottom flat installation is adopted for the pipeline to enter the pump from top to bottom (the top flat installation is also adopted to prevent the gas from accumulating at the pump inlet). The bottom flat installation is adopted for the medium with impurities and the suction speed is lower than the impurity settlement speed. The principle is not to form air bags.

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Treatment Measures and Effects of Stainless Steel Magnetic Pump

1) Select appropriate bearing materials. All friction pairs at the bearing are made of high-quality silicon carbide. High quality silicon carbide has high purity,
Silicon carbide content is more than 99%, resistant to ammonia corrosion, with high strength, elasticity, toughness and wear resistance, which greatly improves the anti extrusion and impact capacity of the bearing, and its service life is more than 10 times that of other sliding bearings (such as graphite).
2) Select proper thrust bearing clearance when installing the rotor. By trial installing the rotor on the bearing body and pushing the rotor to one side, the maximum clearance between the industrial bearing toilet parts of the magnetic pump can be measured (when the bearing is normal, the maximum axial displacement j generated by the rotor is between 0.13-0.15, which is adjusted to 0.3-0.5 mm. This clearance range is conducive to the formation of the liquid film between the gaps, reducing the friction between the two friction pairs of the thrust bearing, and reducing the impact force when being impacted
3) Optimize operation in process to minimize or avoid large fluctuation of working conditions; The pump reversing period shall be extended to 2 months to minimize the adverse effects of frequent pump reversing on the magnetic pump.
4) The improved magnetic pump pays attention to the process operation during operation, showing the inherent characteristics of the magnetic pump. At the same time, it has good operation performance, free of maintenance for a long time, reliable operation, and a maintenance cycle of about one year, which ensures the long-term operation of the equipment.

water ring vacuum pump of phenomenon to be avoided in maintenance

Daily maintenance is in place and production efficiency is improved 100 times

 

The water pump factory wants to tell you that as long as we understand the mechanical structure during maintenance, we can solve the problem quickly and well. The clean water centrifugal pump is a simple machine. During maintenance, we should pay attention to the use within the rated range, and we should not operate with no load. We should pay attention to avoid cavitation and steam binding. We should strengthen inspection and replace the worn sealing parts in time.
The following are the maintenance steps summarized by the water pump plant based on years of experience:
1. Check whether the pipes and joints of the clean water centrifugal pump are loose. Rotate the clean water centrifugal pump by hand to see whether the pump is flexible;
2. Add bearing lubricating oil into the bearing body, observe that the oil level should be at the center line of the oil pointer, and the lubricating oil should be replaced or replenished in time;
3. Unscrew the water diversion screw plug of the pump body of the clean water centrifugal pump and inject water;
4. Close the gate valve and outlet pressure gauge of the outlet pipe;
5. Inch the motor and Wuxi welded pipe to see if the rotation direction of the motor is correct;
6. Start the motor. When the clean water centrifugal pump is in normal operation, open the outlet pressure gauge and gradually open the gate valve, and check the motor load;
7. Try to control the flow and lift of the clean water centrifugal pump within the range indicated on the label. Xinxiang Pump Plant can obtain very good energy saving effect by ensuring that the centrifugal pump operates at a higher efficiency point;
8. During the operation of the clean water centrifugal pump in Xinxiang Pump Plant, the bearing temperature shall not exceed the ambient temperature by 35 ℃, and the higher temperature shall not exceed 80 ℃;
9. If any abnormal sound is found in the clean water centrifugal pump, stop the pump immediately to check the cause;
10. When the clean water centrifugal pump is to be stopped, first close the gate valve and pressure gauge, and then stop the motor;
11. The lubricating oil of the clean water centrifugal pump shall be changed every 500 hours after 100 hours within one month of operation;
12. Regularly adjust the packing gland to ensure that the leakage in the packing chamber is normal;
13. Regularly check the wear condition of the shaft sleeve, and timely replace it if it is worn seriously;
14. When the clean water centrifugal pump is used in cold winter, the drain plug at the lower part of the pump body shall be unscrewed after shutdown to drain the medium to prevent frost cracking;
15. If the clean water centrifugal pump has been out of service for a long time, it is necessary to disassemble all the pumps, wipe off the water, coat the rotating parts and joints with grease, and store them properly.

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Need to know for selection of vertical centrifugal pump

As we all know, the vertical centrifugal pump is used to transport clean water and other basic liquids with physical and chemical properties similar to clean water. It is suitable for industrial and urban water supply and drainage, pressurized water supply for high-rise buildings, garden sprinkler irrigation, fire pressurization, long-distance transmission, and HVAC refrigeration cycle. So the use of different industries is not completely the same, so we can not choose the same product when we choose vertical centrifugal pump, so how do we choose vertical centrifugal pump reasonably?
Reasonable pump selection requires comprehensive consideration of comprehensive technical and economic indicators such as pump unit, pump station investment and operation cost, so as to conform to the principles of economy, safety and applicability. It includes the following aspects:
1) Water pumps with high efficiency, low noise and energy conservation shall be selected, and obsolete products are strictly prohibited.
2) . The pump shall be selected according to the design flow and the required lift, and considering that the pump output decreases due to wear and other reasons, the pump can be selected by multiplying the calculated lift H by a coefficient of 1.05~1.10; The pump with the characteristic curve of gradually decreasing head as the flow increases shall be selected, so that the pump can work stably and reliably in parallel; And the operating point of the water pump should be kept in the high efficiency range, which is not only energy-saving but also not easy to damage the parts.
3) When there is no regulating facility in the water supply network, it is better to use the speed regulating pump set or the rated speed pump set for marshalling operation of water supply. The maximum water output of the pump unit shall not be less than the design water supply flow of the community, and shall be checked according to the fire fighting conditions.
4) . The number of lifting pumps for water tank and water tower shall be reduced as far as possible, and one for use and one for standby; When a single pump can meet the requirements, it is not suitable to use multiple parallel pumps; If multiple pumps must be operated in parallel or matched with large and small pumps, their models and numbers should not be too many. Generally, they should not exceed two types, and the lift range of pumps should be similar; When running in parallel, each pump should still operate within the high efficiency zone.
5) The design water supply flow of the variable frequency speed regulating pump (group) shall meet the requirements of the maximum design flow per second in the domestic water supply system. The power supply must be reliable (dual power supply or dual circuit power supply); The working point of the pump shall be selected in the efficient working area of the pump characteristic curve (Q-H curve), and not in the extension line of the Q-H curve. The most unfavorable working point shall be designed at the right end of the efficient section of the pump characteristic curve, that is, the point where the pump has the largest water output, but the head is low but can meet the requirements, that is, the intersection point between the low point of the efficient section of the pump characteristic curve and the pipe characteristic curve. The working range of water pump speed regulation shall be within the high efficiency range of water pump as far as possible; The speed regulation range should be set between 25% and 100% of the water supply of the pump; The equipment shall have automatic water level control function.
6) The water pump unit of the domestic pressurized water supply system shall be equipped with a standby pump. The water supply capacity of the standby pump shall be greater than the water supply capacity of the largest operating pump. The pump shall be automatically switched and operated alternately.
7) The voltage of the motor equipped with the water pump shall be the same, and the power supply system shall be the same as that of the national grid.

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