Can a deep analysis of the magnetic pump idle or not?

 

With the increasing environmental protection situation, more and more chemical enterprises are required to use magnetic pumps to transport various corrosive materials. As is well known, magnetic pumps cannot idle. As long as they idle for a few minutes, the friction between the shaft and the sleeve inside them will generate extremely high temperatures, quickly wear out graphite bearings and shafts, and even burn out the inner rotor.
In recent years, domestic magnetic pump manufacturers have claimed to be able to produce magnetic pumps that are resistant to idling. Is this true? Is the idle magnetic pump really useful? Can it really idle for a long time?
Today, I will introduce several details to you, hoping to be helpful to users.
At present, there are two main types of idle magnetic pumps produced by some domestic manufacturers. One is to use ceramic rolling bearings to replace the original sliding bearings. When there is a lack of liquid inside the magnetic pump, the friction coefficient of the rolling bearings is lower, and the heat generated is relatively less. Therefore, it can idle without burning the bearings and rotors. The disadvantages of this structure are that it cannot bear high torque, materials with slightly higher density cannot be transported normally, and ceramic bearing balls are fragile.
Another type is the LHC idling fluorine lined magnetic pump developed by Green Ring. This type of magnetic pump is a complete upgrade of the main shaft and shaft sleeve on the basis of the original tradition, and is filled with nano carbon powder technology to achieve the function of idling self lubrication. Relatively speaking, the latter is more technically and theoretically in line with the requirements of idling.

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The role of underwater pumps in low level transportation

 

When a centrifugal water pump is blocked by waste, it is necessary to pull the pump up in order to sort it, which is very inconvenient and therefore rarely used in practical activities. Therefore, using a submerged pump to carry out low-level transportation solves the problem of low-level transportation.
However, due to the use of a short shaft and the uneven axial force of the centrifugal impeller, all shafts are of a suspended wall structure, resulting in significant stiffness at the end of the centrifugal impeller during flipping. The longer the axis, the greater the stiffness. In order to solve this problem, the equipment on the shaft has bearings. However, because the whole shaft is a Flexible shaft, the bearing continues to suffer from unilateral damage, with a high wear rate, strong bearing shaking, and accelerated damage rate. Therefore, the underwater pump has a high frequency of damage. And the shaft is not suitable for making too long, usually within 2 meters. The bearings of the submerged pump are cooled and polished by water using the medium transported by the pump. If the medium of underwater concrete does not freeze and clean the bearings (such incidents can occur when the pump is empty and the inlet is blocked by dirt), it will cause burning of the tiles or even the motor.
The repair equipment of the submerged pump is very laborious. When transporting corrosive media, it is impossible to complete without lifting items. When a centrifugal water pump is transporting liquid, when the liquid level gauge is less than, it is required to fill the pump in order to produce water. Therefore, it is necessary to install a water pump bottom valve at the pump inlet. Over time, if the bottom valve of the water pump is corroded or stuck, exchange or repair is required, making the application inconvenient. Submersible pumps are generally used to transport cold water and rivers, but when used to transport corrosive liquids such as strong acids and alkalis, they are prone to motor erosion and power loss, making them very unsafe. After all, the submerged pump solves the problem of low level transportation, but it also incurs many difficulties in applications. The column type self priming pump is designed specifically for the transportation of low level liquids due to the aforementioned defects of the submerged pump. It can replace a long axis underwater pump on the road, with a naturally aspirated aspect ratio of up to 8 meters. It can be used as a bottom pump and a cabin cleaning pump in ships.

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Requirements for arrangement of centrifugal submersible pumps!

 

Centrifugal submersible pump is a type of submersible pump. With the development of the water pump industry and continuous technological innovation, centrifugal pumps are favored by many customers due to their high efficiency and safety advantages. However, there are still many customers who are limited by their professional knowledge and do not have a good understanding of it, resulting in various problems during the operation and even layout of centrifugal pumps.
1. The pump group should be arranged neatly, and the editor suggests aligning it with the outlet centerline of the water pump.
2. The electrical and process disciplines should be coordinated in a timely manner. When possible, the motor part of the water pump should be as far away from the explosion-proof zone as possible to save investment.
3. The water pump should be as close as possible to the liquid supply equipment to prevent small NPSHa.
4. The power side and pump side of the steam reciprocating pump should have positions for extracting pistons and pull rods.
5. When a vertical pump is not located below the pipe gallery or frame, space should be left above it for installation and maintenance of the pump body.

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What should I do if the metering pump malfunctions while adding medication?

When adding chemicals, precision requirements are quite important, so dosing pumps often use metering pumps, which can accurately control the amount of chemicals added. So when using a metering pump, what aspects and details should be carefully checked to avoid malfunctions?
Since not all metering pumps are equipped with a discharge valve, it is necessary to first check whether it exists, and then require it to be opened during the metering pump suction phase. If it is found that there may be gas leakage at the suction end of the metering pump, it is likely that the hydraulic end suction side connection may lack an O-ring or the suction valve connection may be loose, so it is also important to check here.
During use, it is important to avoid cleaning the hydraulic end of the metering pump with chemicals to prevent the ball and seat of the one-way valve from working properly. If there is indeed a malfunction in the metering pump, it must be promptly identified and resolved as soon as possible.
The first thing to do is to unscrew the screw fixing the pump head of the metering pump, and adjust the stroke length to 0% after the pump head is loose and before removing the pump head; At the same time, ensure that the electromagnetic shaft of the metering pump has sufficient pressure to maintain a stable connection, so that the diaphragm can be unscrewed.
Once the diaphragm is removed, check the safety diaphragm of the metering pump to ensure that it is intact and undamaged.
If there is any damage, it needs to be removed and replaced with a new one. Rotate the back plate and diaphragm clockwise until they are tightly attached; At the same time, it is necessary to adjust the back plate so that the leakage discharge hole is located at the bottom of the pump.
After the diaphragm in the metering pump is installed and the backplate leakage discharge hole is placed in a vertical position, install the pump head, ensuring that the suction valve is aligned with the leakage discharge hole, and the screws on the hydraulic end are aligned with the corresponding four holes. Then rotate to the position of 100% stroke length; Adjust the hydraulic end and diaphragm to the proper position during the operation of metering pump.

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Installation methods and operating procedures for pneumatic diaphragm pumps

If the installation details of pneumatic diaphragm pumps are ignored, long-term careful planning, research, and selection may still lead to poor pumping performance and affect the pump's service life. Pneumatic diaphragm pumps are a new type of conveying machinery that uses compressed air as the power source. For various corrosive liquids, liquids with particles, high viscosity, volatile, flammable, and highly toxic liquids, they can be pumped and absorbed completely. The diameter of the suction pipe of the pneumatic diaphragm pump should not be smaller than the diameter of the pump inlet end. For example, when transporting high viscosity fluids, the diameter of the suction pipe should be greater than the diameter of the pump inlet. The suction piping at the inlet end must be durable and free from wrinkles in order to generate a high vacuum state. The diameter of the outlet piping should be at least equal to the outlet diameter, or slightly larger to reduce friction losses. All piping and joints must be sealed without leakage, otherwise it will reduce the self priming capacity of the pump. Pneumatic diaphragm pump is a commonly used machinery in the chemical industry. After purchasing this pump, if it is not installed by specialized technical personnel, it is likely to delay production. In the following article, I will briefly introduce the installation steps and operating procedures of pneumatic diaphragm pump.
Installation method of pneumatic diaphragm pump
1. Location: Noise, safety, and other logical factors usually have requirements for the location where the equipment should be installed. Parallel installation with conflicting requirements may cause blockage in the usage area and affect the installation of other pumps.
2. Usage: Firstly, the position of the pneumatic diaphragm pump must be easy to use, which will facilitate daily inspection and debugging by maintenance personnel.
3. Air supply: Each pneumatic diaphragm pump should have a ventilation pipe that can provide enough air to achieve the ideal pumping flow rate. The air pressure depends on different pumping needs, but should not exceed 7BAR.
4. Installation height: Please fully consider the self suction capacity of the pneumatic diaphragm pump to avoid the problem of reduced self suction.
5. Pipeline: The pump position can only be determined after considering each possible location where pipeline problems may occur.
The installation of pneumatic diaphragm pumps should be selected at the connection of a short and straight inlet and outlet pipeline, and additional bends and pipe fittings should be avoided as much as possible. The pump body should be able to independently support all pipelines. Moreover, the pipelines should be arranged in an orderly manner to avoid stress on the pump body pipeline device. Flexible hoses can be installed to eliminate the stress caused by the natural reciprocating movement of the pump. If the pump body is to be connected to a fixed base, placing a buffer pad between the pump body and the base will help reduce pump body vibration.

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