Year1
- NH-300PS-F-3：
- 26*20
When the third pump is in use, the ambient temperature should be less than ℃, and the temperature rise of the motor should not exceed ℃.
4. The transported medium and its temperature should be within the allowable range of the pump material. See the attached table for details. The operating temperature of the project is ℃, the operating temperature of the metal pump is ℃, and the suction pressure is not greater than the maximum working pressure, the density is not greater than /, and the viscosity is not greater than /, and does not contain hard particles and fibers.
5. The conveying liquid is a medium that is prone to precipitation and crystallization. It should be cleaned in time after use and the accumulated liquid in the pump should be drained.
After six hours of normal operation of the magnetic pump, the wear of the bearings and end moving rings should be disassembled and the wearing parts that should not be reused should be replaced.
The magnetic coupling transmission pump was first successfully developed by a British company in 2000. A few years later, West Germany also developed successfully. The first two companies to use magnetic drive pumps were Imperial Chemical Industries of the United Kingdom and Bayer Chemical Company of Germany. The original purpose of developing magnetic drive pumps was to protect the safety and health of personnel engaged in chemical, nuclear power, national defense and other industrial sites. After the mid-2000s, the technical level of magnetic drive pumps has been greatly improved due to the development of new generation permanent magnets and silicon carbide bearing technologies such as rare earth cobalt and the most powerful neodymium iron boron. According to foreign samples and literature, the flow rate/lift of the magnetic drive pump can now reach the medium temperature range of ℃ ~ ℃ viscosity limit ~ the content of abrasive solid particles in the medium can reach up to 100% by weight. After taking special measures, the pump It can transport slurry containing insoluble solid matter, and the diameter of the solid matter can reach up to the system pressure. The magnetic drive pump is also suitable for high vacuum conditions where mechanical seals are difficult to handle. These technological breakthroughs and other improvements have resulted in astonishing improvements in the reliability and economy of magnetic drive pumps. A survey of the availability and ease of repair of magnetic drive pumps and mechanical seal pumps shows that the damage and failure rates of sealed pumps are significantly higher than those of magnetic drive pumps. For example, the average life of a mechanical seal on a thermal fluid pump at ℃ is a month, while a magnetic drive pump can run for many years, and the only maintenance required is normal lubrication of the external bearings of the pump and motor. The extensive experience gained in the chemical industry has led to the conclusion that magnetic drive pumps have developed into the most economical solution in many process installations. Therefore, the increase in the use of magnetic drive pumps is not only a reliable environmental factor, but also an economic factor that greatly reduces operating and maintenance costs. Its application scope has expanded from transporting hazardous liquids and precious liquids to general pump applications that require long life and low maintenance. For example, magnetic drive pumps are used on ocean-going ships to transport cold water for air conditioning systems due to high maintenance costs. The use of magnetic drive pumps has grown dramatically in the last decade and has become a common fixture in a variety of applications. Magnetic drive pumps can now cover all applications of sealless pumps.
The magnetic drive pump utilizes the characteristics of magnets that can attract ferromagnetic substances and the magnetic interaction between magnets or magnetic fields. Non-ferromagnetic substances do not affect or rarely affect the magnitude of the magnetic force, so they can pass through non-magnetic materials without contact. The conductor isolation sleeve performs power transmission, and this transmission device is called a magnetic coupling. The motor is connected to the outer magnet through a coupling, and the impeller is connected to the inner magnet. There is a fully sealed isolation sleeve between the outer magnet and the inner magnet, which completely separates the inner and outer magnets so that the inner magnet is in the medium. The rotating shaft of the motor directly drives the impeller to rotate synchronously through the attraction of the magnetic poles between the magnets. Its main advantage is that the transmission shaft does not need to penetrate the pump casing, but uses the magnetic field to transmit torque through the air gap and the thin-walled isolation sleeve to drive the inner rotor, thus fundamentally eliminating the leakage channel of the shaft seal and achieving completely sealed transmission. There is an overload protection function during power operation. Except for the high requirements on magnetic materials and magnetic circuit design, the technical requirements for the rest of the magnetic drive pump are not high, and the maintenance and repair workload of the magnetic drive pump is small. Its main disadvantage is that its efficiency is lower than that of ordinary centrifugal pumps. It has higher material and manufacturing requirements for the isolation sleeve to prevent single-sided leakage. Due to the limitations of materials and magnetic transmission, magnetic drive pumps are generally only used to transport media below ℃ in China. The wear resistance of the isolation sleeve material is generally poor, so the magnetic drive pump is generally used to transport media that does not contain solid particles. The coupling alignment requirements are high. Improper alignment will cause damage to the bearing at the inlet and prevent single-sided leakage. Wear of the isolation sleeve.
How to install a magnetic pump
With its fully sealed, leak-free and corrosion-resistant characteristics, the magnetic pump is widely used in petrochemical, pharmaceutical, electroplating, environmental protection, water treatment, film and television printing, national defense and other departments to pump flammable, explosive, toxic and valuable materials Liquid is an ideal pump for creating a leak-free and pollution-free civilized workshop and civilized factory.
The following matters should be considered during the installation process of the magnetic pump
Place the unit on the foundation, place a pair of wedge pads between the bottom plate and the foundation, and adjust the wedge pads to align the level of the pump. After adjustment, tighten the anchor bolts.
The pump and motor should be inspected before installation. All parts should be intact and there should be no debris in the magnetic pump.
Foundation dimensions: Make a concrete foundation and bury the anchor bolts at the same time.
The suction and discharge pipeline of the force pump should be supported by a bracket, and the magnetic pump cannot be used for support. The diameter of the inlet and outlet pipes should be consistent with the diameter of the pump inlet and outlet.
After the installation is completed, finally turn the magnetic pump coupling by hand to check whether there is any friction. If the rotation is easy and even, the installation is complete.
The pump is strictly prohibited from pumping media containing particles and easily crystallized. It is not allowed to operate continuously with the discharge port closed, and the minimum flow rate must be maintained.
To prevent debris from entering the magnetic pump, a filter should be installed at the inlet, and the filtering area should be greater than ~ times the cross-sectional area of the pipeline.
When the viscosity is too high, the performance and power of the magnetic pump will change. Please follow the instructions for details.
It is necessary to ensure that the installation height of the magnetic pump complies with the NPSH of the pump, and consider the pipeline loss and medium temperature.
Introduction to the advantages of magnetic pump
Magnetic pump is a kind of non-contact torque transmission through magnetic transmission and magnetic coupling, thereby replacing dynamic seal with static seal, making the pump completely leak-free. Since the magnetic rotor in the pump shaft is completely sealed by the isolation sleeve of the pump body, the problem of leakage, leakage, and leakage is completely solved, and the potential safety hazard of leakage of flammable, explosive, toxic, and harmful media through the pump seal in the refining and chemical industry is eliminated, effectively ensuring the physical and mental safety of employees. Healthy and safe production.
Compared with centrifugal pumps that use mechanical seals or packing seals, magnetic pumps have the following advantages: The shaft changes from a dynamic seal to a closed static seal, completely avoiding medium leakage.
Requires independent lubrication and cooling water, reducing energy consumption.
Coupling transmission becomes synchronous drag, without contact and friction. It has low power consumption and high efficiency, and has a damping and vibration reduction effect, which reduces the impact of motor vibration on the pump and the impact on the motor when cavitation vibration occurs in the pump.
When loading, the inner and outer magnetic rotors slip relative to each other, which protects the motor pump.
When the driven part of the magnetic actuator operates under overload or the rotor is stuck, the main and driven parts of the magnetic actuator will automatically slip off to protect the pump. At this time, the permanent magnets on the magnetic actuator will produce eddy magnetic losses under the action of the alternating magnetic field of the active rotor, causing the temperature of the permanent magnets to rise and the magnetic actuator to slip and fail.
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