Maintenance of magnetic pump

Precautions before starting and operation of magnetic pump:
A remove the dirt around the machine and equipment that endangers the safety of the machine and equipment and the actual operating staff.
B before driving, fill the pump with the liquid to be transported (if the pump is sucking), open the inlet valve, close the outlet stop valve, and connect the power supply.
C. connect the power supply and check whether the rotation direction of the pump is appropriate.
D. the generator set shall be put into trial operation for 3-6 minutes. If there is no abnormal condition, funds can be put into operation.
F when starting up for the first time after long-term shutdown or pump maintenance, remove the cooling fan cover of the motor and manually switch it off, check whether the magnetic pump rotates flexibly, and install the cooling fan cover after confirming that there is no problem.
2. Normal shutdown of magnetic pump
First turn off the stop valve at the outlet, and then turn off the power supply.
3. Emergency braking
Stop the motor immediately, and then close the outlet valve and inlet valve.
4. Overhaul and maintenance of magnetic pump
Regularly maintain the pump and motor, and replace vulnerable parts.
When it is unnecessary to shut down for a long time, clean the flow passage in the pump with high pressure and disconnect the power supply.
No idling.
5. Common problems in the operation of magnetic pump
A pay attention to the pressure difference between the front, back, left and right of the suction end filter device. When the pressure difference rises, it means that the filter device is blocked by dirt, and the pump operation should be stopped to facilitate the cleaning of the coarse filter.
B. whether the discharge volume and working pressure meet the standard value; C. whether there is abnormal sound and vibration. If there is abnormal sound or vibration, it generally indicates cavitation or excessive bearing damage.
E. whether the pump produces cavitation: open the outlet gate valve of the pump. When the total flow reaches a certain amount, suddenly there is sound and vibration. At this time, amplify the gate valve again. If the total flow still does not increase, it indicates cavitation. In case of cavitation, the actual operation of exhaust pipe shall be carried out. Note: the magnetic pump must not run under cavitation conditions. If it runs again under such conditions, it will cause initial damage to the bearing.
F whether the current of the motor exceeds the rated voltage.
G. whether the temperature at each position of the pump is abnormally overheated.
H the working pressure of nitrogen pressure stabilization system shall be maintained within the required range.

Common pneumatic ball valve failures

Function of centrifugal pump press out chamber

37. What is the function of centrifugal pump? How many forms of DP?
Answer: the function of screw pump press out chamber is to correctly guide the liquid with minimum loss
The next stage impeller may be led to the outlet pipe, and part of the kinetic energy is converted into pressure energy at the same time.
There are three common types of diaphragm pump press out chamber:
(1) Spiral volute is used to collect liquid gear pump. Kinetic energy becomes pressure energy
It is carried out in the diffuser.
(2) Radial guide vane, which is fixed outside the impeller outlet
The role of.
(3) Ring type press out chamber, used on segmented multi-stage pump*
38. What is the texture color given by centrifugal spring leaves 7
Answer: the impeller of centrifugal pump is generally made of metal, which enters according to the liquid flow
It can be divided into single suction PR force and double suction impeller, which are mainly composed of blade and wheel
The two-part 6-wheel is used to fix the blade and fix the calling wheel on the pump shaft-l.
39. What is the function of centrifugal spring coupling 7
Answer: the function of centrifugal pump coupling is to connect the pump shaft with the prime mover shaft
Play a role in transmitting the energy of the prime mover, buffering axial and radial vibrations, and
Automatically adjust the operation of the prime mover and the slave machine.
40. How many LP couplers are used?
Answer: there are three commonly used couplings:
(1) Rigid coupling, suitable for small, low-speed words with little vibration
On each;
(2) Elastic coupling is suitable for high-speed equipment with variable load,
(3) Gear couplings are mostly used on low-speed heavy equipment.

electric high vacuum butterfly valve of three factors should be considered in the selection

Daily maintenance of high temperature heat transfer oil pump

1. Shutdown: cut off the power supply. Empty the liquid in the heat transfer oil pump, clean it, and rotate the impeller 180 degrees regularly to prevent shaft deformation until the oil pump cools down.
2. The heat transfer oil pump uses fuel with appropriate grade. Generally, No.0 diesel oil is used in summer and No.10 light diesel oil is used in winter.
3. The fuel used by the heat transfer oil pump shall be clean and free of any impurities and moisture. 4. It is normal to have a small amount of leakage at the beginning of the operation of the heat transfer oil pump. After time, the leakage will be reduced or stopped after the sealing surface runs in. Because the heat transfer oil pump shaft is equipped with a stuffing box at the front end, the sealing performance is relatively good, and at the same time, a mechanical sealing device is set in the bearing seat, so a large amount of leakage is impossible to occur, and a small amount of leakage can be discharged and received through the leakage pipe orifice.
5. The heat transferred from the transmission medium to the pump cover and bearing of the heat transfer oil pump is dissipated by the surface of the pump cover and bearing seat, so that the temperature of the bearing seat can adapt to the temperature of the shaft sealing performance. Therefore, when selecting the installation position of the heat transfer oil pump, the heat of the pump cover and bearing seat should be easy to diffuse without any heat storage.
6. Two ball bearings are set in the bearing seat. A ball bearing on the pump impeller side of the heat transfer oil pump is lubricated with the transmitted heat transfer oil, and a ball bearing on the coupling side is lubricated with high-temperature grease: after 3000 hours of operation, each ball bearing is removed and cleaned with diesel oil, and the contact surface is checked for damage. If it is damaged, replace it with a new bearing. When installing the ball bearing near the impeller side, the side with dust cover should be installed towards the impeller, and heat transfer oil should be injected for lubrication before startup. The ball bearing near the coupling side is lubricated with compound calcium base high temperature grease. When the bearing is reinstalled, the side with dust cover should also be installed towards the impeller side, and the grease should be filled during installation. After the bearing runs for 48 hours, use a grease gun to inject supplementary grease into the pressure injection cup on the bearing cover.

vacuum pump manufacturers to repair cracks by measures taken

Chemical pump maintenance can be divided into several categories!

In the chemical industry, petrochemical industry, and many other industries, chemical pumps, centrifugal pumps, magnetic pumps and other equipment are repaired in order to restore their functions after deterioration or failure, including all kinds of planned maintenance and unscheduled fault maintenance and other maintenance. The basic contents of pump equipment maintenance include: equipment maintenance, equipment inspection, equipment repair and replacement.
Pump maintenance type
Post accident maintenance
In the maintenance strategy after the equipment works to the occurrence of obvious faults, the measures taken are to dismantle the damaged equipment or components for repair or renewal.
characteristic:
① The cost of maintenance is high and a waste of time, delaying normal production.
② Reserve various spare parts for replacement; Allocate more maintenance workers to deal with maintenance.
Regular preventive maintenance
Go to the site for maintenance according to the predetermined time interval, and repair or replace the equipment before major faults occur.
characteristic:
① The maintenance cost is less than that after the accident.
② Improper maintenance interval will cause unnecessary excessive maintenance.
Condition monitoring and maintenance
Based on the actual working condition of the equipment, it is implemented through the monitoring results of the equipment.
Whether to repair depends on abnormal phenomena such as mechanical vibration, bearing temperature and running noise.
If a selected parameter reaches the predetermined critical value, the equipment will be shut down for maintenance, so as to avoid more serious accidents.
characteristic:
① The maintenance goal is clear and the production efficiency is high.
② It is necessary to purchase corresponding testing equipment and train personnel.
Standard preventive maintenance procedures
Daily inspection work content
① Check whether the discharge pressure of the pump is normal.
② Check the sound, vibration and bearing temperature when the pump is running.
③ Check the pump body and auxiliary pipelines for leakage.
④ Check whether the coupling guard is loose.
⑤ Check the amount of lubricating oil and sealing cooling water.
⑥ Keep the equipment clean.
⑦ If any abnormality is found, report to the dispatcher.

2BE1-355 pump for bearing and mechanical seal of disassembling process

What is a shaft seal free centrifugal pump?

1、 Overview of shaft seal free centrifugal pump
Shaft seal free centrifugal pump is also known as packing free centrifugal pump. It is usually a vertical canned motor or a horizontal canned motor, which is driven by a wet winding motor without a shielding pad.
In this case, the pump and motor share a pressure pump housing, and there is a heat shield between the pump parts and the motor parts. The heat shield can be active or passive. The allowable medium temperature is as high as 420 ℃
2、 Characteristics of shaft seal free centrifugal pump
The bearing is lubricated by discharging medium. In practice, there is no limit to the system pressure, because the total leakage rate is slightly higher than the mark, so it can be used for dangerous media or valuable media.
3、 Special form of shaft seal free centrifugal pump
The special form of shaft seal free centrifugal pump is designed according to the application purpose.
·Special impellers for liquid and gas mixtures or suspended solids
·Sealing system specially used for nuclear reactor technology or sealing system with protective gas gasket
·Heating device specially used for quick condensing fluid, such as hot water circulating pump
·Protective cover with abrasion protection

vacuum unit of cooling cycle process

Large flow portable submersible pump

Maintenance method of large flow portable flood control and rescue submersible pump
Maintenance methods of portable submersible pumps, flood control submersible pumps, and large flow portable submersible pumps
Due to the high purchase cost of the large flow portable submersible pump, it is necessary to carry out regular maintenance before the damage of the large flow portable submersible pump is found in the process of use. Here are the maintenance methods of the large flow portable submersible pump for your reference:
Easily damaged parts: mechanical seal
Portable submersible pump oil chamber
The way to check in advance is to loosen the screw and check whether the oil level inside is full. If there is no oil inside, it is likely that an oil seal at the bottom is broken. If the oil seal is broken, it is recommended to return to the factory for maintenance and replacement. If there is still oil inside, please turn the pump upside down to let the oil inside out into a container and observe whether the oil contains water, If there is water in the oil, it means that the waterproof mechanical seal needs to be replaced.
The method to replace the waterproof mechanical seal is as follows: first remove the fixing screws at the water outlet of the submersible pump and remove the water outlet, then remove the impeller screws, find a rectangular wood, put one end on the bottom of the impeller, and use a hammer to knock down the upper end of the square wood with a hammer to lift the impeller down, and then remove the three bolts of the oil chamber cover plate and remove the cover plate to see the relevant parts of the mechanical seal, Before removing the mechanical seal, remember the installation sequence of the mechanical seal. It is recommended to take photos and archive them. After removing the old mechanical seal, install the new mechanical seal in the correct sequence, and then install the cover plate of the oil chamber according to the removal sequence, fill the oil chamber with transformer oil, and then install the impeller and water outlet.
Large flow portable submersible pump
To learn more about large flow portable submersible pump, recommended reading: Portable submersible pump
If you want to choose a self-priming pump and configure it on the power pump truck, it is recommended to read: large flow self-priming pump
If the delivered liquid contains a lot of impurities, it is recommended to choose stainless steel submersible pump for sewage

water ring vacuum pump unit of isolation treatment

Does the self-priming pump need to install a bottom valve?

The common self-priming pump refers to the external mixing suction and filtration self-priming pump. According to the rotation of the centrifugal impeller, the liquid flows into the volute, and then the pump shell generates a vacuum pump. In that way, the product of the self-priming pump will start, suck the liquid in from the inlet, and transport the liquid out according to the path of the impeller. It is the principle of the self-priming pump.
An obvious feature of self-priming pump different from centrifugal pump is that it does not need to inject water in the case of application. However, in the case of a single application, you must remember to inject water into the pump cavity. Because the pump shell itself does not store liquid, if you do not inject water in the case of a single application, the pump will rotate at a high speed, which will not only prevent the liquid from being sucked up, but also continue to burn the mechanical seal and other parts of the pump shell due to the high rotation speed. Therefore, you must pay attention to this.
So should the self-priming pump be installed with a bottom valve
01
If the bottom valve is not installed
What is the situation?
Generally speaking, there is no need to install the bottom valve. Generally, the inlet of the self-priming pump is equipped with a check valve, which is often referred to as this product, so after the pump is terminated, the liquid in the pump body cannot flow back to the original pool and be stored in the pump body, so there is no need to add liquid in the case of the second application,
02
If the bottom valve is installed
What about the situation?
If the bottom valve is refitted, the actual effect will be better, because sometimes if this product is destroyed, there is also a bottom valve as a guarantee, which is not easy to appear high speed, and after refitting the bottom valve, it will also reasonably ensure the reasonable suction lift of the pump!
Another special case, but if there is too much difference in the suction height width ratio, or the suction pipe is large, and the volume exceeds the liquid storage in the self-priming pump cavity, everything cannot work normally. At this time, it is necessary to refit the bottom valve to ensure the rapid safety of natural suction.

What is the liquid viscosity of acid resistant vacuum pump?