The Ultimate Guide to Canned Motor, Design, Application & Advantages.

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 defence and housing operate as a leak-tight component providing low amplitude.

Pumps with magnetic coupling. These pumps are hermetically sealed and 100 per cent leak-proof and, as a result, are safe for the atmosphere. This allows the use of them once dealing with dangerous explosives and toxic materials. Magnetic coupling eliminates the need for worn parts, reducing pump unit maintenance prices.

The choice of canned motor pumps is set by the necessities of 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
The liquid temperature during pumping
Easy repair
Safe Operation
Leak Proof

Within the last thirty years, the valuable life and level of reliability have been significantly raised, and production prices of the canned pumps are reduced additionally, so having opened up the chances for their application. Nowadays, strict environmental and method safety standards are developed, increasing the 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.

The integrated motor pumps have obtained wider circulation in observation, as they came into use earlier than those with magnetic coupling. However, the range of the latter’s ability to control high temperatures and pressures and with advanced liquids has been constantly expanded. Thus, the industry is particularly interested in applying pumps with magnetic coupling. This is explained by the fact that such pumps possess unique engineering solutions that allow removing several defects typical for integrated motor pumps.

Canned motor pumps: design features

Using the static seal instead of a dynamic one within the sealed chamber in the pump with magnetic coupling has eliminated the matter of shaft leakage.
The pump units with magnetic coupling have a standard motor that activates the shaft with a magnetic drive. The internal rotor runs using the magnetic field action. Between the north and south poles, the magnetic field is made that eliminate the sliding of the coupling.
The magnet within the chamber is often connected to the shaft, whereas the outer magnet is placed from the outside. The latter is connected to the drive so that in its rotation, the magnetic forces come back through the chamber casing and activate the inner magnet. The flux passes through the air gap and leak-less enclosure without physical contact with the internal rotor. The insulation provides the pump system free of leakage and is created from rust-resistant material.
The containment shroud is one of the most necessary parts of this sort of pump. It features a high level of method liquid resistance, endurance, and thermal stability. It determines the maximal medium temperature and internal pressure. The construction material of the containment shroud depends on the appliance.
To ensure the canned pump’s long life and fail-safe operation, efficient cooling and lubrication system performance is needed, especially in the case of pump units with metal containment shrouds.
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 widely utilized in the process industry thanks to their capability to deal with hazardous materials. this type of pump is additionally used in solar energy generation, the photography industry, the chemical industry, treatment of various sorts of surfaces, printed boards production, additionally as wastewater filtration.

The canned pumps with the magnetic drive are widely utilized in petrochemical industries, proving their particular safety and irreplaceability.

Canned motor pumps: advantages

The advantages of canned motor pumps include the ability to control applications handling dangerous and radioactive materials, gasses, aggressive steam products, and low-viscosity liquids.