In fact, smoke exhausters are also forced-draught types of machines. They are needed to remove gases from the room, products of fuel combustion. The DN series is also designed for this. Thanks to the equipment of this class, an appropriate draft is created in the boiler. The boiler unit will maintain the corresponding performance indicators. Next, we will talk about how a smoke exhauster works.

The principle of operation of a smoke exhauster

Such installations are distinguished by the simplest possible design. The following parts are usually present:

1. Electric motors.
2. Pedal frame.
3. Axial guide vane.
4. Impeller.
5. Welded casings.

In fact, the impeller consists of two disks, a hub and curved blades. The difference between models D is that the impeller blades are bent forward. The number of parts themselves varies, up to 16–20 or more. The main thing is that the design is protected from the effects of any abrasive and aggressive substances that can cause harm. Among the products of combustion, they are present quite often.

Strong carbon alloys become the basis for the hull and most of the other structural elements. Other protective coatings are often added. Therefore, the device retains its properties for a long time and works flawlessly.

The impeller rotates, due to which an air flow is created. Then everything passes through the snail and is output through the flange. Sometimes special smoke and ash traps are added. Due to them, the operation of devices becomes more efficient. Flue gases passing through the unit are processed better. Anyone will figure out how the smoke exhauster works.

D smoke exhauster: main technical characteristics

D smoke exhausters https://energo1.com/catalog/ventilyatsionnoe_oborudovanie/tyagodutevye_mashiny/dymosos_d/ are produced as monoblocks. There is a single support frame or metal structure on which the electric drive is placed. This is how the centrifugal fan is set in motion.

The description of the main characteristics is as follows:

1. From 0 to 270 degrees in 15 degrees - the rotation angles of the discharge pipe.
2. Execution from the right or left side. This determines which direction the impeller rotates.
3. Five main sizes are used. These are No. 18, No. 15.5, No. 13.5 and No. 3.5. There is an option No. 2.7.
4. Support for operation at medium or high pressure levels.
5. Bend in the direction of rotation.
6. Total number of blades up to 32.
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In the production, high quality stainless or carbon steel is used. But this does not affect the general principle of operation of the smoke exhauster. Therefore, they are used in heavy industry to force supply air to boiler furnaces through gas ducts. Suction is only one way. The main thing is that the level of balanced thrust remains nominal, otherwise the normal operation of the installation becomes impossible. The capacity will be 1-25 tons of steam every hour.

The unit is distinguished by its universal design. Therefore, it can be used on different objects.

For these devices, the creation of forced draft is typical. But it is better to use additional systems to protect against abrasive and chemically active substances, solid elements.

The overall design is also more complicated. The use of a closed base for an electric drive with a working engine is typical. You can not be afraid that dust or scale will get inside the structure, because manufacturers add a special casing.

The technical characteristics of the smoke exhauster also deserve special attention.

1. The use of all-welded casings. They are spiral or split. Are supplied with round and rectangular openings with flanges, on an exit. The inlet flange is attached to the corresponding holes. The angle of rotation for housings is determined depending on GOST.
2. At the inlet pipe, the housing is made in the form of cylinders. There are not only flanges, but also a collector fixed inside. The main purpose is to form air flows at the entrance to the wheel. One of the flanges is needed to connect to the body, the other helps to fix the SHE.
3. Welded radial, centrifugal impellers are used. They have hubs, flat rear and tapered front discs. Not without spatulas. The place of attachment is on the shaft of electric motors, or an intermediate shaft of the chassis is chosen.
4. There are welded bases in the form of beds. It is needed to fix the electric motor and the main components of the TDM in their positions.
5. Electric motors. In most cases, they refer to three-phase and asynchronous types of devices. They operate on AC power at a frequency of 50 Hz.

The pumps support left or right rotation.

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