Radial fans: device and application

The fan is an engine - driven device capable of generating air or other gases. Today, there is a wide variety of types of these devices, for example, radial fans are in demand in the industry. The technical characteristics, power, dimensions, noise and other parameters depend on the type of device and the purpose of its use.

In the air conditioning and ventilation systems, the following main types of device designs are used.

The axial ones are arranged in such a way that the air flow moves along the axis of rotation of the wheel. These types are often used to create air exchange systems.

Centrifugal or radial fans create conditions in which air flows enter the axis of movement of the wheel, but leave the device in the radial plane. This type is widely used in ventilation systems.

Diameter gauges ensure that the inlet and outlet of the flow are perpendicular to the rotation of the wheel.

On the strength of the created pressure, all devices are divided into a fan (radial) of medium pressure, low and high.

Centrifugal devices were most widely used.

Radial fans consist of a blade vane wheel, which is in a spiral-shaped casing. During the rotation, the wheel directs the air located between the blades along the path from the center, while simultaneously it compresses. Centrifugal force, which acts during rotation, throws compressed air into the casing, from which it flies to the discharge port.

The main part of the device is the impeller. It is most often produced in the form of a hollow cylinder having on the outside of the scapula. The blades are installed parallel to the axis of rotation at the same intervals. Their fastening in front and behind is carried out by means of two disks, in the center of which there is a hub, used to attach the motor to the shaft.

The radial fan in its design can have backward or forward curved blades, the number of which is determined by the type and function of the device. Industrial devices are manufactured with eight positions of the spiral housing, with the right or left-handed direction of the spiral.

Radial fans, actively used in air conditioning and ventilation systems, are responsible for the quality of air exchange.

Depending on the type and purpose of the system, centrifugal devices are installed with one- or two-sided suction, as well as devices with V-belt gears, devices located with the driving motor on one shaft.

In addition, low-pressure radial fans are used with the direction of the bending of the blades in different directions in the direction of travel. The bent blades allow the installation of the device to reduce the electricity consumption by almost 20 percent. Also, it is advisable to use them in modes where air consumption is performed with overload.