An axial fan is usually an impeller (K) located in a cylindrical housing, mounted on the motor shaft. Additionally, an input guide vane (IVA) and a straightening vane SA can be used.

Our company produces axial industrial fans according to the K and K+SA schemes.

In an axial fan, the moving medium passes along the axis of rotation of the impeller.

The main part of an axial fan is the impeller, due to the rotation of which part of the drive energy is transferred to the air to create a certain pressure and speed of movement of the moved medium.

The impeller consists of a bushing and blades arranged evenly around the circumference in a certain manner. The blades are made of volume or sheet and can be rotary or fixed.

The straightening apparatus (SA) serves to convert the dynamic pressure associated with the speed of swirl of the flow behind the impeller into static pressure. In this case, the static pressure and static efficiency increase without increasing power consumption. In some designs, the SA additionally performs the functions of a power unit, where an electric motor or bearing unit can be placed.

Roof axial supply fans type VKOP and VKOP-K
Roof axial supply fans are used in supply systems smoke ventilation(PD) and installed on the roofs of buildings and structures.
Fans supply outdoor air to the premises provided for in paragraphs. 7.14 set of rules SP 7.13.130 “Heating, ventilation and air conditioning. Requirements fire safety", ensuring smoke-free escape routes in case of fire.
The use of fans simplifies ventilation system, saves space in technical premises and is regulated by paragraphs. 7.17 SP 7.13.130.

VKOP
Fans of the VKOP type are a simple and economical option for roof installations of supply and smoke ventilation.
VKOP can be installed on an air duct or a prepared base on the roof. In the absence of a prepared base, it is recommended to install the VKOP on the roof on a glass mounting type SMK or SMKU using an adapter type PO-SMK.

VKOP-K
Distinctive features of the VKOP-K fan from the VKOP fan are:
standard equipment with a PO-SMK adapter for installation on a SMK or SMKU glass;
improved appearance;
check valves and protective nets built into the protective cap;
In a variant, the fan is covered with a thermal and noise-insulating casing.
The VKOP-K type fan is a complete air pressurization unit with design options to suit any project requirements.

Installations of the UVOP type are used in supply smoke ventilation (SD) systems and are installed on the roofs of buildings and structures.
When operating an installation without air ducts, an inlet confuser of the KS-VO type with a protective mesh is used on the suction side.
To reduce the dynamic pressure at the outlet of the installation, it is recommended to use an outlet diffuser of the DV-VO type.

VOF-DU
The axial flare fan for smoke removal systems in case of fire is manufactured on the basis of a standard axial fan for smoke removal systems in case of fire type VO-13-284-DU.
The fan is mounted vertically on a special adapter for subsequent installation on a standard SMK or SMKU type glass.
Around the fan there is a casing in the form of an octahedron and truncated octagonal pyramids in the upper and lower parts of the casing.
The air outlet from the fan is closed by a leaf check valve, which completely protects from atmospheric influences.
The use of such a casing determines modern design fan, provides an ejector effect during operation, which actually increases air productivity.
The use of an axial fan in the design complements the roof fan with its field of parameters radial fans and provides ample opportunities for selecting fans.

VKOP-S
Roof-mounted axial supply fan type VKOP-S is primarily used in supply and smoke ventilation systems (SD). The fan can also be used as a regular roof supply fan.
The fan consists of a typical axial fan various designs, installed on a special adapter for subsequent installation on a standard glass of the SMK or SMKU type.
Around the fan there is a casing in the form of an octahedron and truncated octagonal pyramids in the upper and lower parts of the casing. The casing contains rectangular holes with protective meshes for air intake.

The use of the VKOP-S fan in tandem with the VOF-DU fan creates a harmonious pair on the roof of the building industrial installations created in the same style and having a modern design.

IN TO
The roof axial fan is made on the basis of the standard axial fan VO-13-284.
To improve performance characteristics, the fan is equipped with a confuser and a diffuser. The fan is installed vertically and has an umbrella for protection from precipitation. The fine-mesh mesh included in the umbrella is guaranteed to protect the air channel from foreign objects. To install the fan on the roof, it is convenient to use a standard SMK or SMKU type glass with the corresponding PO-SMK adapter.

VKO-K
Roof axial fan with valve (based on VO-13-284).
The fan has a built-in check valve anti-penetration atmospheric air and precipitation in the serviced ventilation duct with the fan turned off.

VKO-K is manufactured in various designs:
01 – with an outer casing that provides additional protection for the fan housing and valve, as well as improving performance characteristics due to the ejection effect;
02 – simplified version, used for installation in cramped conditions;
03 – equipped with an umbrella for additional protection from precipitation.

Fans VKO and VKO-K, thanks to a different field of parameters, complement the range of radial-type roof fans.

To reduce vibration levels transmitted from fans to bases and connected air ducts, use various types vibration isolators and flexible inserts.
Additional equipment

Purpose
Flexible inserts are designed for connecting fans general purpose with air ducts or valves.

Design
Inserts can be installed on the suction side and on the discharge side of the fan (VG-VO). The insert consists of a sleeve and flanges attached to it. A strip flange is used on VG-VO inserts.

The material of the hose and flanges is determined by the fluid being moved. For each fan version there is a corresponding insert version.

terms of Use
Flexible inserts are intended for use in temperate (U), tropical (T) climates of the 1st and 2nd category of placement according to GOST 15150-69.
temperature environment:
from -45 to +40°С for temperate climates,
from -10 to +45°С for tropical climate

IN Lately on Russian market ventilation equipment There has been a sharp increase in interest in smoke ventilation systems and the main components of these systems - smoke removal fans. This is largely due to the approval of a new “ Technical regulations on fire safety requirements", one of the sets of rules of which is entirely devoted to fire safety requirements to heating, ventilation and air conditioning systems: “Code of Rules 7.13130.2009 Heating, ventilation and air conditioning. Fire safety requirements"

The production of smoke removal fans is one of the main activities of the VKTekhnologiya company. This article addresses the following issues:

Types of smoke exhaust fans

The main differences between smoke extraction fans are the housing design and the type of impeller. The most common and in demand fans on the Russian market are roof radial fans And radial scroll fans .

Roof radial fans

Roof radial fans have a number of advantages over others.

Firstly, fans are placed on the roof, the area of ​​which is usually not used. This makes it possible to abandon the need to equip special rooms for placing smoke exhaust fans, and, as a result, increase usable area premises.

Secondly, fans are placed on a shaft made of construction material, which in many cases makes it possible to avoid laying a vertical air duct. Another clear advantage is that air is released directly from the fan into the environment, and there is no need to use an air duct to remove combustion products from the fan.

The housing design of roof-mounted smoke exhaust fans is used in two types: fans with side discharge and upward discharge. When choosing a fan housing design, one of the requirements must be taken into account regulatory documentation: release into the atmosphere should be provided at a height of at least 2 m from the roof of flammable materials; It is allowed to release combustion products at a lower height when protecting the roof with non-combustible materials at a distance of at least 2 m from the edge of the emission hole. The advantage of a side-discharge fan is its relatively low cost.

The advantage of a fan with upward discharge is a higher location of the combustion products emission mark relative to the roof level. To install a roof-mounted smoke exhaust fan, a mounting bracket is used. The upper flange of the mounting housing is connected to the outer flange of the fan. The lower part of the mounting sleeve has different connecting dimensions depending on the shaft design. One way or another, the lower part of the glass rests on the shaft. The weight of the fan is transferred through the mounting cup to the shaft. There is a standard the lineup mounting cups, which is presented in the VKT product catalog. Also, depending on the shaft design, our designers select glasses with individual connecting dimensions. In certain cases, the use of an insulated mounting sleeve is required. In this case, the body of the glass is covered with thermal insulation, and an insulated air damper is placed inside the glass.

Radial scroll fans

Sometimes the use of roof-mounted smoke extraction fans is not possible. In these cases it applies radial scroll fan. The advantage of this fan is that it can be placed almost anywhere in the building or near the building, taking into account the equipment placement standards. In addition, it is possible to connect an air duct to this fan both at the inlet and outlet. Considering that the fan is capable of developing pressure up to 2000 Pa, it is possible to remove combustion products from the fan over fairly long distances. Air ducts on both the suction and discharge sides must have a certain fire resistance. As a rule, the required fire resistance is achieved by coating the air ducts with a fire retardant compound.

Calculation and selection of smoke exhaust fan

When calculating and selecting smoke exhaust fans, it should be taken into account that all characteristics presented in the catalog correspond to normal atmospheric pressure and air temperature 20 o C. To recalculate the characteristics of the fan to the temperature of the removed smoke, it is necessary to multiply the pressure by a factor of 293/(273+T), where T is the value of the temperature of the removed smoke in o C.

The VKTekhnologiya company produces fans with backward-curved blades. When selecting a fan for one operating point, as a rule, several fans are suitable. As one of the options, you should choose the fan that has a lower rated motor power, if this characteristic is relevant. Otherwise, it is recommended to use a fan whose size is smaller in order to reduce its cost.

It must also be remembered that in different points According to the operating curve, the fan consumes different power, that is, the rated power of the motor depends on the characteristics of the network.

Operating principle and control of the smoke exhaust fan

The principle of operation and control of the smoke exhaust fan is quite simple. A control panel is used for the fan. The signal to turn on the fan comes to the control panel from the fire automatic control panel.

As a rule, a smoke exhaust fan is used only in smoke ventilation, but sometimes it can be used in general ventilation systems. In this case it applies a frequency converter, which, upon receiving a signal from the fire automatic control panel, increases the fan rotation speed. This scheme is quite profitable because it allows you to refuse additional system general ventilation using only a smoke removal system.

KVDU - roof smoke removal fan

DU - smoke removal

PVK - PetroVentKomplekt

When a fire occurs and a fire begins, the people in the room are endangered not only by the fire itself, but also by the combustion products, which can lead to complete disorientation and loss of consciousness. For this reason, it is important to ensure that smoke is removed from the very first seconds using a special ventilation structure.

Purpose and device

The PetroVentKomplekt company produces smoke extraction fans, axial fans for air pressurization and roof-mounted supply fans, which are successfully used at construction, industrial and administrative sites throughout Russia and the Customs Union.

Mounting the roof radial fan DYM (VKR)

Roof-mounted smoke removal fans DYM-F (exhaust upward) and DYM-N (exhaust to the side) remove combustion products from a room engulfed in flames, thereby providing conditions for the work of the fire brigade and the survival of victims. Both models, DYM-F and DYM-N, are radial smoke removal fans capable of operating at temperatures up to 600 C for two hours. Additional equipment includes mounting brackets for fastening to the roof (models MSU, MSU-VKOP), as well as check valves and control panels.

Smoke extraction fans from PetroVentKomplekt

Specialists from the technical department of our company have developed an energy-efficient fan impeller, which allows, with the same performance, to use smoke removal systems of more compact sizes and lower-power electric motors.

In addition, all RC roof fans produced by PetroVentKomplekt have landing dimensions, fully compatible with equipment from other manufacturers. This allows us to use our equipment at any facility and to implement even the most complex projects. If necessary, our company’s professionals will help you select the optimal equipment and installation components, and will also provide assistance in commissioning works on the object.

If you want to buy smoke extraction fans at the manufacturer's price, get the full free consultation our technical specialist by calling: +7-812-309-48-11, or sending a request through the form feedback Online.

Right now you can download the price list for products, technical catalog, selection program and questionnaires:

Selection program
questionnaires
technical catalog
Price list

The company "TEHVENTPROM" offers roof-mounted smoke extraction fans (VRMK) radial type. Direct purpose - air exhaust in residential and industrial premises.

All prices on request

Usually, roof smoke exhaust fan installed on the roof of the building. They are used to remove high-temperature smoke that occurs during a fire, as well as to ventilate air with the environment. Horizontal and vertical views, as well as four-way and two-way outlet of moved air.

Purpose of VRMK roof smoke removal fans

The fans comply with the fire safety requirements established in GOST R 53 302-2009, SP 7.13130.2009 and are designed to move smoke-air mixtures formed during a fire with a temperature of 400°C for 120 minutes and 600°C for 120 minutes.

The transported medium must be non-explosive, do not contain explosive gas mixtures, sticky substances, fibrous or abrasive materials, and cannot be more aggressive towards carbon steels of ordinary quality than the aggressiveness of air. The content of dust and other solid impurities in it is no more than 10 mg/m³. For aggressive and explosive environments, fans are made of of stainless steel and dissimilar materials.

Roof-mounted smoke removal fans VRMK used in emergency systems exhaust ventilation industrial, public, administrative, residential and other buildings, except categories A and B according to SP 7.13130.2009. It is prohibited to use fans for purposes other than their intended purpose.

Operating conditions for roof-mounted smoke exhaust fans

It is prohibited to use fans for purposes other than their intended purpose.

The fans are intended for operation in temperate (U) climate conditions of the 2nd category of placement according to GOST 15150-69 at ambient temperatures from minus 45° to +40°C, relative humidity up to 100% at a temperature of 25°C. Fans can be used in moderate climate conditions of the 1st category of placement.

The root mean square value of the vibration velocity of external vibration sources at the fan installation sites should not exceed 2 mm/s.

Basic technical data and characteristics of roof-mounted smoke exhaust fans

3.1 The design of fans, their overall and connecting dimensions are shown in Figures 1, 2, 3 and Table 1.

3.2 Aerodynamic characteristics of fans are shown in Figures 4-27.

3.3 Specifications electric motors are given in table 2

3.4 Installation of the fan on the glasses (passage units) of the SMKU in Fig. 4

1 - base, 2 - impeller, 3 - fan diffuser, 4 - casing, 5 - wall, 6 - electric motor blower impeller, 7 - fender impeller, 8 - hub, 9 - screen, 10 - bracket, 11 - blower system diffuser electric motor.

Fig.1 Main parts and components of the fan

1 base, 2 - impeller, 3 - fan diffuser, 4 - casing, 5 - wall, 6 - impeller for blowing the electric motor, 7 - fender impeller, 8 - hub, 9 - screen, 10 - bracket, 11 - diffuser for the blowing system of the electric motor , 12 - flare unit, 13 - flow direction

Fig.2 Main parts and components of the fan

A - length, width of the fan;

H - fan height

D- diameter;

C is the distance between the centers of the connecting holes.

Rice. 3. Main parts and components of the fan

Rice. 4. Installation of the fan on the glasses (passage units) of the SMKU

Main overall and connection dimensions
fan VRMK-3.15DU - VRMK-14DU

	Overall and connection dimensions mm.
Fan index							ejection to the sides	ejection up
VRMK-3.15DU
VRMK-3.55DU
VRMK-4.5DU
VRMK-5.6DU
VRMK-6.3DU
VRMK-7.1DU
A fire occurs due to careless handling of fire. The source of the fire may be in difficult-to-reach places, so arriving firefighters cannot immediately neutralize it. The main danger to human life is caused by combustion products and increased temperature. In order to ensure safe evacuation, fire system specialists have developed roof-mounted smoke extraction fans. Types and characteristics A roof fan is one of the units of a smoke removal system, which is designed to remove a hot gas mixture from a building. It is he who takes the main heat shock and, thanks to its design, continues to work until the fire is completely eliminated. The temperature of the removed gas mixture can reach +900 °C. Roof-mounted smoke extraction fans come in three types, depending on the method of removing the gas mixture to the outside: axial, diagonal and radial. - one of the simplest in its design. It is a cylinder with blades in a protective casing. By rotating, the propeller blades artificially reduce the pressure and thereby draw out the gas mixture. Appearance resembles a simple home fan. A diagonal fan is an elongated drum, inside of which one or more impellers are placed. The blades suck in hot air along the axis and throw it out diagonally, hence its name. The advantage of this unit is its high performance and low noise level. A centrifugal or radial fan removes smoke from the room thanks to the special design of the blades. During operation, such a fan throws combustion products into the street due to the centrifugal force created by the curved blades. With high air exchange, such a fan is quite noisy, so it is usually installed in industrial buildings. Roof smoke exhaust fans are available in automatic and manual versions. Automatic devices equipped with special sensors. They are triggered when the temperature rises. Manual models equipped with a special button to turn on. Criterias of choice Before choosing a roof fan, there are a number of criteria to consider: The roof fan structure is assembled in the factory. This helps avoid design inaccuracies that reduce aerodynamic performance. As a rule, the smoke exhaust fan model is selected at the design stage. But if the fan becomes unusable during operation, then you can select it yourself, according to the existing nomenclature. In the designation of the fan VR-10-DU-2ch/600(400) °С-5.5/710, the letters indicate its type (“VR” - radial, “DU” - smoke removal). Numerical values ​​in order determine its main parameters: “10” — wheel size; “2h” – fire resistance limit; “600(400) °C” is the temperature of the transported gas mixture; “5.5/710” - engine characteristics power and speed. Some manufacturers add the direction of rotation of the wheel and the position of the housing in degrees to the standard nomenclature. Device installation Installation of a fan depends on the type and angle of the roof. First, make a hole and install a check valve in it; if necessary, install a vibration-absorbing structure. Then the tray is attached, and the fan structure itself is attached on top. It is important to avoid distortion during installation, since the fan will not work in this position. After fastening, it is necessary to treat all connections with a special fire-resistant sealant. When choosing a roof-mounted smoke exhaust fan, you must remember that it helps people not to get poisoned or burned by combustion products during a fire, so its choice must be carefully considered. It must be powerful, compact, with low level noise. The design must be light and fire resistant. Read also Two "new" commandments of Jesus Christ Moscow Sretensky Theological Seminary Pros and cons of modern democracy Development of a system of criteria and indicators for assessing the effectiveness of innovative projects when creating integrated industrial production management systems Rozhdestvenskaya Karine Samvelovna Development of a strategy map