Canned motor pumps: overview
Canned Motor Pumps are heavy centrifugal units. These pump units may be divided into two groups depending on the kind of its drive and weatherproof seal:
- Integrated motor pumps. These pumps are compact units with weld-free bodies. The pump and its motor are designed as a monoblock. The blade and the rotor are mounted on the shaft. the method liquid lubricates the friction bearings and fluid bearing within the rotor pocket. The rotor moves towards the friction bearings. Partial flow dissipates the heat from the motor. The motor defends and housing operate as a leak-tight component providing the low amplitude additionally.
- Pumps with magnetic coupling. These pumps are hermetically sealed and 100 percent leak-proof and as a result are safe for the atmosphere. this allows using them once dealing with dangerous explosive and toxic materials. Magnetic coupling eliminates the need to use wear-parts so reducing the pump unit maintenance prices.
The choice of the canned motor Pumps is set by the necessities to the unit application in certain conditions and environments. Thus, the combination of the following factors should be considered:
- Operation economy
- Sound emission
- Installation area required and easy mounting
- Performance factor
- Operating Pressure Range
- Liquid temperature during pumping
- Easy repair
- Safe Operation
- Leak Proof
Nowadays strict environmental and method safety standards are developed resulting in the increasing implementation of leak-less solutions within the pump unit production industry. these days completely leak-proof units are pumping radioactive, toxic, and fire-hazardous materials with no risk of leakage. within the last thirty years, the useful life and level of reliableness have been raised greatly, and production prices of the canned pumps are reduced additionally, so having opened up the chances for their application.
Currently, the integrated motor pumps have obtained wider circulation in observe, as they came into use earlier than the pumps with magnetic coupling. however, the range of the ability of the latter to control with high temperatures and pressures as well as with advanced liquids has been constantly expanded. Thus, at the moment the industry is very interested specifically in applying the pumps with magnetic coupling. this is explained by the fact that such pumps possess special engineering solutions that allowed removing a number of defects typical for the integrated motor pumps.
Canned motor pumps: design features
- The use of the static seal instead of dynamic one within the sealed chamber in the pump with magnetic coupling has eliminated the matter of the shaft leakage.
- The pump units with magnetic coupling are equipped with a standard motor that activates the shaft with a magnetic drive. the internal rotor runs by means of the magnetic field action. Between north and south poles the magnetic field is made that eliminates the sliding of the coupling.
- More often the magnet within the chamber is connected to the shaft whereas the outer magnet is placed from the outside. The latter is connected to the drive in such a way that in its rotation the magnetic forces come back through the chamber casing and so activate the inner magnet. The flux passes through the air gap and leak-less enclosure with no physical contact to the internal rotor. The insulation provides the pump system free of leakage and is created from the rust-resistant material.
- One of the most necessary parts of this sort of pumps is the containment shroud. It features a high level of method liquid resistance, endurance, and thermal stability and determines the maximal medium temperature and internal pressure. the material of construction of the containment shroud depends on of the appliance.
- To ensure long life and fail-safe operation of the canned pump, efficient performance of cooling and lubrication system is needed, especially just in case of pump units with metal containment shroud.
- The pump units with magnetic coupling imply adherence to operation and installation instructions, production practices and in some cases the use of integrated systems of protection and interlock.
Canned motor pumps: application
The Canned Motor Pumps are wide utilized in the process industry thanks to its capability to deal with hazardous materials. this type of pumps is additionally utilized in solar energy generation, photography industry, chemical industry, treatment of various sorts of surfaces, printed boards production, additionally as waste water filtration.
The canned pumps with the magnetic drive are wide utilized in petrochemical industries, having proved their special safety and irreplaceability.
Canned motor pumps: advantages
The advantages of the canned motor pumps include the ability to control in applications handling dangerous and radioactive materials, gasses, aggressive steam products, as well as with low viscosity liquids.
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