The main function of the positive pressure air supply outlet

The basic function and composition of the positive pressure air outlet.

The telegraph DC24V opens the valve. (Make sure the voltage can't be lower than 22V, so that it can be turned on and off effectively).

The valve can be opened manually from a distance.

Manual reset at a distance.

After the valve is actuated, it outputs an opening signal and can be interlocked with other equipment according to user requirements.

Function: When a fire occurs, the electric actuator inside it will open the air outlet, the temperature smoke detector or manual fire alarm will be turned on, the positive pressure fan on the top of the tower will automatically open, and the air supply shaft will be pressurized, and the front room of the staircase will supply air to the front room through the positive pressure air supply outlet, so that the front room will maintain positive pressure to ensure that the smoke will not spread in this area, and give people a space to escape. When the temperature is higher than 280 °C, there is no possibility of escape, the internal fuse will be blown and the tuyere will be automatically closed to prevent the spread of fire.

Application: The national design code for fire and smoke exhaust of high-rise buildings stipulates that independent mechanical smoke prevention systems should be set up in the following parts.

1. Smoke-proof stairs without natural smoke exhaust conditions, fire elevator front room or shared front room.

2. The smoke-proof staircase with natural smoke exhaust does not have a front room with natural smoke exhaust.

3. Closed refuge floor.

The electric positive pressure air supply port uses a thick valve body and thick blades.

Supports electrical signals. (Pressure sensors can be added).

Normally closed, electric, manual opening. Output start-up signal. Manual reset shut-off. The 280 thermometer actuates and the valve closes again. The thin mechanism is adopted to reduce the size of the operation box and improve the effective ventilation and smoke exhaust area.

Positive pressure air supply is to send air to the escape corridor when an accident occurs, which is conducive to escape, and at the same time the air supply is under positive pressure in the corridor, that is to say, the air pressure in the corridor is higher than that of other places, and the smoke will not seep in and cause suffocation to ensure safety.

When a fire breaks out, the motor inside the motor will open the air outlet and warm the smoke sensor.

Or the manual fire alarm will be turned on, the positive pressure fan on the top of the tower will be automatically turned on, and the air supply shaft will be pressurized, and the front room of the staircase will continuously supply air to the front room through the positive pressure air supply outlet, so that the front room will maintain positive pressure, ensure that the smoke will not spread in this area, and give people space to escape.

Summary. What is the air supply system of the direct irrigation pressurized air supply system?

Hello dear, when there is no condition to set up a pressurized air supply shaft, the stairwell can use a direct irrigation pressurized air supply system.

The setting of the direct irrigation pressurized air supply system shall comply with the following provisions:

1. For high-rise buildings with more than 15 floors, the air supply method of multi-point parts of the stairwell should be adopted, and the service radius of the air supply outlet should not be greater than 10 floors.

2. The air supply volume of the direct irrigation pressurized air supply system should be increased by 20% compared with the calculated air supply volume. 3. The pressurized air supply outlet should not be located on the first floor. When implementing, attention should also be paid to the installation location of the fan and the requirements of fire partition, and the investment in power distribution and control is also increased accordingly.

What is the air supply system of the direct irrigation pressurized air supply system?

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When there is no condition for setting up a pressurized air supply shaft, the stairwell can use a direct irrigation pressurized air supply system. The setting of the direct irrigation pressurized air supply system shall comply with the following provisions: 1. For high-rise buildings with more than 15 floors, the air supply method of multi-point parts of the stairwell should be adopted, and the service radius of the air supply outlet should not be greater than 10 floors.

2. The air supply volume of the direct irrigation pressurized air supply system should be increased by 20% compared with the calculated air supply volume. 3. The pressurized air supply outlet should not be located on the first floor. When implementing, attention should also be paid to the installation location of the fan and the requirements of the fire partition, and the investment in power distribution and control will also increase accordingly.

Provide fresh air to evabots on the fire ground and use wind pressure to slow the spread of smoke.

**The positive pressure air supply of air conditioning is a process requirement for air conditioning and ventilation, that is, the air pressure of the air conditioning site should be greater than the air pressure in the critical area, and fresh air should be continuously added under the premise of ensuring air conditioning. Operating rooms, large computer rooms, precision instrument manufacturing workshops, high-level residences and other conventional settings. Positive pressure air supply is a key parameter for smoke-proof stairwells and frontroom positive pressure systems.

A lot of work has been done in recent years to study the influence of natural wind on flue gas movement and flue gas control system using wind tunnels. The data of the surface pressure coefficient (CP) value of the building with simple geometry has been obtained through a large number of wind tunnel experiments, and in the positive pressure air supply system of high-rise buildings, in order to operate satisfactorily, it is required that the air entering the shaft of the protected stairwell must not be polluted by smoke. In Ref. [4], it is suggested that when designing a positive pressure air supply system, the intake position of fresh air can be set close to the ground (at the bottom of the building) or on the roof.

Ventilation close to the bottom of the building is an effective and reliable method for most buildings. However, the air intake from the roof is affected by the natural wind outsidePositive and negative pressure forces are generated on the roof surface, which can adversely affect the positive pressure air supply system and may also bring outdoor smoke back into the building.

The purpose of this study is to determine the magnitude of the pressure generated by natural wind and how much it affects the operation of the positive pressure air supply system, first to determine the pressure coefficient (CP) value of the roof surface at different wind angles and with and without parapets, and then to use the critical wind speed (u. ) to analyze the reasons why the positive pressure air supply system may fail under the action of natural wind by using roof air intake.

In the event of a fire in a high-rise building, a smoke-proof stairwell is the only vertical evacuation route for people inside the high-rise building. For smoke-proof stairwells, fire elevator front rooms or shared front rooms that do not have natural smoke exhaust conditions, a reasonable mechanical pressurized air supply system is an indispensable smoke prevention measure to prevent the spread of smoke to the stairwell and front room and ensure the smooth evacuation of personnel in the building. However, regional overpressure in a pressurized air supply system is very dangerous.

The pressure in the front room or stairwell is too high, and the evacuation door is difficult to open or cannot be opened, which affects the safe evacuation of personnel.

There are three ways to prevent overpressure: one is to use a residual pressure valve to control overpressure; the second is to set up variable speed fans and pressure sensors; The third is to set up a bypass valve and a pressure (differential) sensor (XM-RPS). Among them, the method of using residual pressure valve (XM-24-A) is more conventional and does not require electrical control, so it will not be repeated; Due to JGJ 16 - 2008 "Code for Electrical Design of Civil Buildings" 13

9.Article 6 stipulates that "the control loop of fire-fighting equipment shall not use a variable frequency governor as a control device", so the method of setting up a variable speed fan and pressure sensor cannot be applied to the design; There are not many examples of how to set up a bypass valve and a pressure (differential) sensor.

Manufacturer: Zhuhai Simi Technology **** National investment, 15819817024

Positive pressure blower, as the name suggests, is to use the fan to send the wind from the outside of the first imperial calendar into a certain space. Therefore, the direction of the airflow should be the outside - the wind search machine - the dismantling of the beam and the inside.

I would like to add a knowledge point to you: the principle of the blower.

The working principle of the blower is to rotate through the impeller, which generates a lifting force. Air is drawn along the central axis from the suction side, then transported to the air duct and subsequently discharged. Most of the fans are inverter adjustable fans, and they are widely used in buildings and factories.

What are the components and setup requirements for mechanically pressurized air supply? Let's find out with Huajian Consumer Inspection.

1) Mechanically pressurized blower.

The mechanical pressurized air supply fan can be axial fan or medium and low pressure centrifugal wind machine, and its installation position should meet the following requirements:

1) The air inlet of the blower should be directly connected to the outside.

2) The air inlet of the blower should be located in the lower part of the mechanical pressurized air supply system, and measures should be taken to prevent the invasion of flue gas.

3) The air inlet of the blower should not be located at the same level as the air outlet of the smoke exhaust fan. When it must be located at the same level, the air inlet of the blower and the air outlet of the smoke exhaust fan should be arranged separately. When arranged vertically, the air inlet of the blower should be set below the smoke exhaust outlet, and the minimum vertical distance between the two edges should not be less; When arranged horizontally, the minimum horizontal distance between the two edges should not be less than 20m.

4) The blower should be set up in a special machine room. The room shall be separated from other parts by partition walls and floor slabs with fire resistance limits not lower than those of Grade A fire doors.

5) When a one-way damper or electric damper is installed on the air outlet pipe or inlet pipe of the blower, the valve should be automatically opened in case of fire.

2) Pressurized air outlet.

The pressurized air supply outlet is used as the tuyere of the mechanical pressurized air supply system, which has the function of smoke driving and smoke prevention. Pressurized air supply outlets are divided into two forms: normally open (stairwell) and normally closed (front room).

Negative pressure fresh air system refers to forced exhaust: the indoor dirty air is discharged from the bathroom, kitchen and other areas, and the fresh air enters from the gaps between doors and windows or window air intakes.

The working principle of the positive pressure fresh air system is forced air supply: the outdoor air is sent into the room, and the air positive pressure area is generated indoors, and the bad air in the room is discharged through the gaps between doors and windows.

The two-way flow fresh air fan is forced exhaust and forced air supply to tease, the fresh air in the two-way flow system is sent by the blower, the blower is connected with the air distributor installed in the room through the pipe, the blower continuously sends the outdoor fresh air into the room through the pipe sock resale channel, and the exhaust fan of the two-way flow fresh fan discharges the dirty air to the outside.