The “snail” fan case resembles the shell of a given mollusk. This equipment is used in a number of industrial facilities, housing, ventilation systems. The principle of operation is the force created by the rotational motion of the rotor blades, they penetrate the inlet openings in the form of a cochlea, capture the air flow and drive it through the outlet openings. Settled at an angle of 90 degrees to the entrance hole.
Features
Mighty fan "snail" with your own hands is obtained in the process of assembly work only if you know the design. The installation and the impeller create a torque for air movement. The need for an exhaust device increases with limited space, then installation occurs with specialized equipment. The “snail” case of the fan is made in the form of a spiral and serves to direct air.
Homemade fans of this type are very popular lately. However, in the absence of skills and the necessary time, the purchase of finished equipment will be one of the best options.
To create an air flow in the inner part of the fastening of the “snail” fan, it is necessary to arrange a radial element - a wheel attached to the unit. The discharged space is created by curved impellers of the wheel.
The intake of air mass is carried out through the inlet pipe. The inlet pressure drops and draws in ambient air. As a result of the rapid movement of air in a spiral in the outlet, the speed increases significantly and high pressure is created. An air stream is rapidly flowing from the outlet pipe. If the pipe is on the left, then the rotor rotates clockwise, if on the right, then it is the opposite.
When assembling with your own hands, the curvature of the used "snail" blades is taken into account.
Threads Created
Centrifugal "snails" - power taken into account in three positions.
Low pressure fans - not higher than one hundred kg / cm squared. Temperature no more than 80 ° C. They are used for equipping production halls and building houses. "Snails" are installed on the roofs.
Models with an average pressure - from one hundred to three hundred kilograms per centimeter square.
High-pressure equipment - three hundred to one thousand two hundred kg / centimeters squared. High-pressure air flows of exhaust "snails" are usually located in the combustion zones of various types of fuel in boiler rooms, in warehouses with fuel and lubricants, duct systems of paint and varnish workshops.
The centrifugal fan "snail" requires reliable fastening and a solid base. In order to avoid vibration, the housing is qualitatively fixed. Ignoring this phenomenon will cause the device to fail.
Do it yourself
This is a rhetorical question that requires a welder or tinsmith in the process of mastering the skills. After all, assembly is carried out from sheets of metal of various thicknesses.
Making the blades yourself, and then high-quality fastening to the rotor is a rather difficult task. After all, if the balance is disturbed, the fan will fly to pieces due to the significant rotation of the rotor in the first minutes of operation.
When evaluating the power and speed of rotation, the electric motor is correctly selected. At the same time, craftsmen use snails dismantled from equipment, vacuum cleaners and hoods. This serves as a guarantee of determining the power and parameters of the housing.
It is possible to assemble a "snail" fan for domestic needs in the workshop, this will be a feasible task. In other cases, fans are only used by the manufacturer.
Creature
Instructions for creating.
- Calculate the parameters and dimensions of future equipment. At the same time, damper gaskets are inserted in order to avoid vibration during operation. These measures will save the "snail".
- The use of improvised material in the manufacture of a fan case made of plastic, plywood. When performing assembly work, once again find out that there are no gaps and the seams are sealed.
- First you need to analyze the power circuit of the unit. Power is taken into account here. At high fan power, a belt drive is used. At low power, a shaft is used, rotor connections with a gearbox.
- Mounting elements are used, namely the plate with the letter "P" for mounting on the housing. A solid foundation is needed for powerful units.