CN102538120A - Safe escape system of enclosed airflow channel at L-shaped building member edge - Google Patents

Abstract

The invention discloses a safe escape system of an enclosed airflow channel at an L-shaped building member edge. The escape system comprises an L-shaped first static pressure box and an L-shaped second static pressure box; the first static pressure box and the second static pressure box are opposite to each other in the vertical direction and are arranged in parallel; the first static pressure box and the second static pressure box are communicated by a ventilating pipeline; the ventilating pipeline is provided with an air inlet connected with a blower; and the opposite sides of the first static pressure box and the second static pressure box are provided with a first nozzle and a third nozzle as well as a second nozzle and a fourth nozzle, which blow to each other in pairs and form a jet flow region and a positive pressure region for effectively preventing smoke from entering a safe region. According to the unique design of the safe escape system of the enclosed airflow channel at the L-shaped building member edge, four groups of airflows colliding with one another can be produced; a piston flow is produced by the collision among the airflows to drive away the smoke in a special region, so that a safe and clean channel is formed at the L-shaped building member edge and finally, a clean and safe survival way is created for the escaping of staff.

Description

A safety escape system for the closed passage of air flow at the edge of L-shaped building components

technical field

The invention relates to a personnel escape system, in particular to a safety escape system for an air flow closed channel at the edge of an L-shaped building component.

Background technique

A large amount of smoke will be produced after a fire, and high-temperature smoke is the main cause of death in a fire. Since the flue gas is at a higher temperature than the environment, its density will be lower than that of air. The low smoke density compared to the surrounding air creates a buoyant force which causes the smoke to move upwards. When the flue gas moves upwards and hits the ceiling, the flue gas that touches the ceiling later will push the flue gas that touched the ceiling before. This results in a horizontal movement of the smoke along the ceiling, which studies have shown to be dangerous as it carries the smoke to various parts of the building.

Studies have shown that for building elements or multi-storey buildings, the height of the smoke will decrease continuously due to the accumulation of the smoke on the top of the space. This will greatly reduce the space for people to escape, see Figure 1. This can make it difficult for people in the building to escape. Thereby causing great loss of personnel and property. If after a fire occurs, a clean, low-temperature area without smoke can be formed in the building through various technical means, which will greatly facilitate the escape of personnel. Improve personnel safety after a fire. Thereby minimizing the loss of personnel and property.

Relevant studies have shown that there is currently no smoke prevention and exhaust system that can 100% eliminate fire smoke caused by fire. The existing smoke prevention system for building components mainly adopts the method of setting smoke exhaust outlets on the top of the building to exhaust the smoke, so as to dilute the smoke in the building and reduce the indoor smoke concentration. However, the current existing technology has the following problems: question:

(1) Flue gas dilution is not completely eliminated. Most of the flue gas still exists in the building, and this part of the flue gas will also cause loss of personnel and property.

(2) The effect of flue gas dilution does not directly depend on the power of the exhaust fan. Because of the suction force of the exhaust fan, a negative pressure is formed in the building, that is, the pressure inside the building is greater than the pressure outside the building. High-powered smoke exhaust fans are also unable to fully extract the smoke from the building.

Aiming at the technical shortcomings of the existing technology to exhaust smoke simply through the smoke exhaust outlet, the applicant applied for an invention patent in 2010, which is called a smoke prevention system for stairwells (patent application number: 201010580513.6). Improvements were made. Based on the scientific concept of "blocking is worse than sparse", the applicant formed a pair of jet flow areas through six independent "jet" nozzles, thereby effectively preventing the entry of smoke, and finally achieved the effect of releasing smoke. .

With the applicant's further research on this topic, the applicant found that the above system still has the following technical defects:

(1) Although the previous application can prevent the smoke from entering the protection area through the "jet" nozzle, due to the turbulence and random fluctuation of the smoke, this makes the smoke itself different from the wind speed of each nozzle, As a result, the stairwell smoke prevention system only has a blocking rate of 70%-80% (volume percentage) of smoke, so the remaining 20%-30% (volume percentage) of smoke will enter the patented smoke protection area.

(2) The previous application cannot rule out the smoke passing through the "jet" nozzle and the jet area. On the contrary, the diffusion of the smoke passing through the jet area will be accelerated due to the action of the upper and lower jet nozzles.

(3) Since the previous application cannot exclude the smoke passing through the collision jet area, its main design purpose is to enhance the smoke blocking efficiency of the smoke prevention system. There are three pairs of six nozzles for the smoke prevention system in the earlier application. Through the later research and practice, we found that the technical improvement design of the earlier application increases the initial investment capital, manufacturing difficulty and operating cost of the system.

Contents of the invention

In view of the defects or insufficiencies of the prior art, the purpose of the present invention is to provide a safety escape system for the airflow closed channel at the edge of an L-shaped building component, so as to effectively prevent the smoke from spreading to the edge of the L-shaped building component in the event of a fire. Provide a smoke-free passage for the victims to escape safely.

In order to achieve the above-mentioned technical purpose, the present invention adopts the following technical solutions to achieve:

A safety escape system for an airflow closed channel at the side of an L-shaped building component, characterized in that:

It includes an L-shaped first static pressure tank and an L-shaped second static pressure tank. The first static pressure tank and the second static pressure tank are arranged opposite and parallel up and down. The first static pressure tank and the second static pressure tank are connected by a ventilation duct. The ventilation duct is provided with an air inlet; the surface of the first plenum box opposite to the second plenum box is provided with a first spout and a second spout, and the outside of the corner of the first plenum box is provided with a second plenum. Five nozzles, the first nozzle is adjacent to the fifth nozzle; the surface of the second static pressure tank opposite to the first static pressure tank is provided with a third nozzle and a fourth nozzle; wherein: the first nozzle and the third nozzle Symmetrically arranged up and down; the angle between the air outlet direction of the first nozzle and the vertical direction is 1°～5°, the angle between the air outlet direction of the third nozzle and the vertical direction is 1°～5°, And the angle between the wind outlet direction of the first nozzle and the vertical direction is the same as the angle between the wind outlet direction of the third nozzle and the vertical direction; the wind outlet direction of the fifth nozzle, the wind outlet direction of the first nozzle The orientation and the wind outlet direction of the third nozzle intersect on the same line; the second nozzle and the fourth nozzle are set up and down opposite each other, and the wind outlet direction of the second nozzle and the wind outlet direction of the fourth nozzle are both vertical and opposite .

Other technical characteristics of the present invention are:

Both the second nozzle and the fourth nozzle are equipped with diverging nozzles, and the area ratio of the outlet of the diverging nozzle and the inlet of the diverging nozzle is 5 to 1.

The area at the outlet of the first nozzle is the same as the area at the outlet of the third nozzle, and the ratio of the area at the outlet of the expanding nozzle to the area at the outlet of the first nozzle is 5:1.

The longitudinal distance between the first nozzle and the third nozzle is less than or equal to 3m, and the longitudinal distance between the second nozzle and the fourth nozzle is less than or equal to 3m.

The unique design of the safety escape system of the present invention can generate two sets of air flows colliding with each other. The high-speed airflow is sprayed through the opposite air port located on the side of the static pressure box to blow against it to form a jet area to prevent the entry of smoke. At the same time, the relative air outlet located inside the static pressure box is used to spray low-speed airflow to blow against it to form a positive pressure area, which is used as the "backup" for the smoke prevention of the jet area, so as to increase the blocking rate of the system to the smoke and at the same time eliminate the turbulence. The smoke entering the smoke protection area is eliminated by the function.

The present invention has the following advantages:

(1) Due to the effect of the positive pressure area, the system of the present invention can effectively eliminate the smoke entering the area, instead of just preventing the smoke from entering, and its smoke blocking rate is close to 100%.

(2) The system of the present invention does not occupy a building volume during actual installation, and there is no additional component to block the escape when personnel escape.

(3) The cost of the system of the present invention is low, the system is simple, and the installation and construction process is simple.

Description of drawings

Figure 1(a1) and Figure 1(a2) are schematic diagrams of the smoke concentration distribution on the longitudinal section of an L-shaped building component at a distance of 15m from the fire source at 60 seconds and 180 seconds after the fire, respectively;

Figure 1(b1) and Figure 1(b2) are schematic diagrams of the smoke concentration distribution on the longitudinal section of the L-shaped building component at 10m from the fire source at 60 seconds and 180 seconds after the fire, respectively;

Figure 1(c1) and Figure 1(c2) are schematic diagrams of the smoke concentration distribution on the longitudinal section of the L-shaped building component at 5m from the fire source at 60 seconds and 180 seconds after the fire, respectively;

Fig. 2 is the structural representation of safe escape system of the present invention;

Fig. 3 (a) is the A-A sectional view of Fig. 2, and Fig. 3 (b) is the B-B sectional view of Fig. 2;

Fig. 4 is the schematic diagram of calculation optimization analysis of gradually expanding nozzle outlet and inlet area ratio;

Figure 5 is a schematic diagram of the smoke concentration in the smoke protection area under different longitudinal distances between the upper and lower relative nozzles;

Fig. 6 is a schematic diagram of the air outlet direction of the airflow closed channel safety escape system at the side of the L-shaped building component of the present invention;

Fig. 7 is the optimized analysis schematic diagram of the air supply velocity ratio of two nozzles on the same plenum of the present invention;

Fig. 8 (a1) and Fig. 8 (a2) are respectively 60 seconds and 180 seconds after the fire broke out, the schematic diagram of the smoke concentration distribution on the longitudinal section at 15m away from the fire source in the L-shaped building component after the system of the present invention is installed;

Figure 8 (b1) and Figure 8 (b2) are respectively 60 seconds and 180 seconds after the fire broke out, a schematic diagram of the smoke concentration distribution on the longitudinal section at 10 m from the fire source in the L-shaped building component after the system of the present invention is installed;

Figure 8 (c1) and Figure 8 (c2) are respectively 60 seconds and 180 seconds after the fire broke out, a schematic diagram of the smoke concentration distribution on the longitudinal section at 5m away from the fire source in the L-shaped building component after the system of the present invention is installed;

Fig. 8 (d) after the system of the present invention is installed, the smoke concentration distribution diagram on the cross section at a height of 2m from the ground 240 seconds after the fire occurred;

Figure 9 is a schematic diagram of the blocking rate of the smoke prevention system for smoke under different angles between the nozzle and the vertical direction;

Figure 10 is a schematic diagram of the smoke concentration distribution of the previous application "stairwell smoke prevention system (201010580513.6)";

Fig. 11 is a schematic diagram of the comparison of the smoke concentration velocity field between this application and the previous application "Smoke Prevention System for Stairwells (201010580513.6)".

The specific implementation manners of the present invention will be described in further detail below in conjunction with the accompanying drawings.

Detailed ways

The L-shaped building component in the present invention refers to the constituent elements of the interior space of the building, such as an L-shaped atrium, an L-shaped corridor, and an L-shaped platform.

The invention is equivalent to opening up a safe, pollution-free, low-temperature, high-visibility personnel escape passage in the building. The effectiveness of the passage has nothing to do with the fire intensity and fire location, thereby ensuring the life of personnel to the greatest extent. Property security. When a fire occurs, the safety escape system of the present invention can form a clean, low-temperature, smoke-free area in the building through scientific and reasonable technical means.

As shown in Fig. 2 and Fig. 3, the safety escape system of the L-shaped building component side airflow closed passage of the present invention comprises an L-shaped first plenum box 1 and an L-shaped second plenum box 5, and the first plenum box 1 and The second plenum 5 is relatively up and down and arranged in parallel, and the two are connected by a ventilation duct 8, and the air inlet 9 provided on the ventilation duct 8 is connected with a fan; the first plenum 1 and the second plenum A first spout 3 and a second spout 4 are arranged on the opposite face of the plenum box 5, and a fifth spout 2 is arranged on the outside of the corner of the first plenum box 1, the first spout 3 is adjacent to the fifth spout 2, and the fifth spout 2 is adjacent to the fifth spout 2. On the surface opposite to the first static pressure box 1 of the second static pressure box 5, a third nozzle 6 and a fourth nozzle 7 are arranged; The four nozzles 7 are arranged up and down oppositely; the angle between the air outlet direction of the first nozzle 3 and the vertical direction is 1°～5°, and the angle between the air outlet direction of the third nozzle 6 and the vertical direction is 1° °～5°, the angle between the wind outlet direction of the first nozzle 3 and the vertical direction is the same as the angle between the wind outlet direction of the third nozzle 6 and the vertical direction, and the wind outlet direction of the fifth nozzle 2 , the air outlet direction of the first nozzle 3 and the air outlet direction of the third nozzle 6 intersect on the same line, and the air outlet direction of the fifth nozzle 2, the air outlet direction of the first nozzle 3 and the air outlet direction of the third nozzle 6 The orientations are all towards the outside of the L-shaped building component, and the air outlet direction of the second nozzle 4 and the air outlet direction of the fourth nozzle 7 are both vertical and opposite to each other.

The second nozzle 4 and the fourth nozzle 7 of the present invention are gradually expanding nozzles, and the area ratio of the outlet and the entrance of the gradually expanding nozzle is 5:1. The larger the ratio, the more thoroughly the dynamic pressure at the outlet of the spout will be converted into static pressure, which in turn will bring greater static pressure, thereby forming a better positive pressure area, and then better excluding the smoke entering its interior; However, an excessively large outlet area will bring a greater cost; when the area ratio of the outlet and inlet of the gradually expanding nozzle is 5:1, it can ensure a good ratio of dynamic pressure to static pressure and avoid cost. too high. The schematic diagram of cost and dynamic pressure conversion efficiency ratio is shown in Figure 4. It can be seen from this figure that the optimal ratio of the area of the outlet of the diverging nozzle to the area of the inlet is 5:1, which is the ratio selected by the present invention.

The longitudinal distance between the first nozzle 3 and the third nozzle 6 is less than or equal to 3m, and the longitudinal distance between the second nozzle 4 and the fourth nozzle 7 is less than or equal to 3m. When the air volume is constant, if the longitudinal distance between the nozzles is too large, the jets ejected from the nozzles cannot collide, so that the jet flow area and the positive pressure area cannot be formed, and the smoke cannot be effectively removed. Figure 5 shows the change of the smoke in the smoke protection area as the longitudinal distance between the nozzles increases. It can be seen that the smoke concentration increases significantly after the distance of 3m. Therefore, in this application, the longitudinal distance between the nozzles is taken to be less than or equal to 3m, and the distance in this range can ensure the collision of the outgoing jets, thereby ensuring the formation of the positive pressure zone and the jet flow, and finally effectively exhausting the smoke.

When a fire occurs, the fan draws clean outdoor air and sends it into the first plenum box 1 and the second plenum box 5 through the ventilation duct. Discharge from the first nozzle 2, third nozzle 4 and fifth nozzle 7 with a certain relative positional relationship to the outside of the component, and discharge from the second nozzle 3 and fourth nozzle 6 into the smoke-free passage, effectively dispelling the smoke on the top of the building gas.

From a theoretical analysis, the wind in any direction can be decomposed into the superposition of winds in the X direction, Y direction and Z direction with different sizes according to the vector principle, as follows:

Wind speed WS1(x, y, z)=u1(x)i+v1(y)j+w1(z)k

Wind speed WS2(x, y, z)=u2(x)i+v2(y)j+w2(z)k

In the formula: u1(x), u2(x) are the velocity functions in the x direction, v1(y), v2(y) represent the velocity functions in the y direction, w1(z), w2(z) represent the velocity functions in the z direction , i is the subscript in the x direction, j is the subscript in the y direction, and k is the subscript in the z direction;

The superposition of wind speed WS1 and WS2 is:

WS3(x, y, z)=[u1(x)+u2(x)]i+[v1(y)+v2(y)]j+[w1(z)+w2(z)]k

When two winds from different directions collide, if there is no velocity component in the Z direction and the velocity in the Y direction is equal, then:

WS3(x, y, z)=[u1(x)+u2(x)]i+[v1(y)-v2(y)]j+[0+0]k

=2×u1(x)i

The wind speed in the vertical direction is offset after the incoming wind from different directions collides, leaving the wind speed in the horizontal direction; at the same time, the momentum loss of the high-speed air flow is relatively small compared to the momentum carried by itself due to the excessive momentum after the collision of the high-speed air flow. After the high-speed wind from the upper and lower sides collides, the conversion of dynamic pressure to static pressure is incomplete, thus forming a push flow moving to the outside of the component, thus forming a mixing zone.

The present invention is based on the above-mentioned principle, wherein the first nozzle 3 and the third nozzle 6 are symmetrically arranged up and down and adopt an inclined air outlet, so as to realize the collision of the air outlets of the first nozzle 3 and the third nozzle 6, and offset the vertical direction of the air outlet. The velocity component is superimposed on the horizontal velocity component, and the air outlet velocity of the two is large enough to form the air piston in the horizontal direction, which prevents the smoke from entering the middle of the L-shaped component and makes the incoming smoke roll in the upper space within its range of action. At the same time, the present invention is arranged up and down relatively through the second spout 4 and the fourth spout 7 and adopts vertical air outlet, the second spout 4 and the fourth spout 7 have a small wind speed and are in a collision state. After the up and down collision, the fluid itself A large part of the carried dynamic pressure or momentum will be lost, and this part of the lost dynamic pressure or momentum will be directly converted into a pressure difference, thus forming a positive pressure zone, as shown in Figure 6. In this way, the colliding jets formed by the first nozzle 3, the third nozzle 6 and the fifth nozzle 2 can effectively block the smoke from entering the safe area due to the large momentum, while the second nozzle 4 and the fourth nozzle 7 are due to the large momentum. Due to the large positive pressure, it can effectively return the smoke pressure in the jet flow area formed by the first nozzle 3, the third nozzle 6 and the fifth nozzle 2 to the outside of the safe area, thus finally playing the role of forming a safe passage. effect.

In addition, because the wind will collide with the corner wall, resulting in momentum loss, thereby reducing the effect of flue gas dredging, so the fifth nozzle 2 is added at the corner of the passage, and the direction of the wind outlet of the fifth nozzle 2 is the same as that of the first The outlet direction of the first nozzle 3 and the third nozzle 6 intersect in a line, which will increase the momentum of the outlet wind at the corner, forming a piston flow with greater thrust, and preventing the smoke from entering the safe area. The reason why it is only in the upper part The design is due to the fact that most of the smoke is concentrated in the upper space of the building due to buoyancy. In this way, the purpose of preventing the smoke from spreading to the safe area is not occupied, and a relatively clean escape area is created in the area covered by the smoke without occupying the escape space.

The air outlet velocity of the nozzles sharing the same wind source can be adjusted by controlling the size of the area at the outlet of the nozzles, and the size of the tuyere is inversely proportional to its wind speed. In the present invention, the first nozzle 3 and the third nozzle 6 are on the outside, which requires a higher The air outlet of the wind speed forms a large amount of smoke offset by the jet flow area, and the air outlet of the second nozzle 4 and the fourth nozzle 7 needs a lower wind speed to form a positive pressure area, so the second nozzle 4 and the fourth nozzle 7 are both gradually Expansion spout, make the second spout 4 and the 4th spout 7 place outlet area area greater than the first spout 3 and the 3rd spout 6 outlet area, the first spout 3 and the 3rd spout 6 wind speed ratios the second spout 4 and the 3rd spout The wind speed of the four nozzles 7 is high;

At the same time, the wind speed of the second nozzle 4 and the fourth nozzle 7 is not easy to be too large or too small. When it is too large, it will affect the escape speed of personnel and give people an uncomfortable feeling. If it is too small, it cannot completely ensure that the smoke is isolated from the positive pressure area. Based on this, the area ratio between the outlet and the inlet of the expanding nozzle in the present invention is 5 to 1. And under this area ratio, the momentum of the wind will be reduced quickly after the collision, and most of its momentum will be converted into pressure, which can ensure that there is enough dynamic pressure of the wind to be converted into static pressure, that is, most of the momentum will be converted into Form a positive pressure zone for the air pressure to discharge the smoke entering the passage out of the safe zone; the first nozzle 3 and the third nozzle 6 are small nozzles relative to the second nozzle 4 and the fourth nozzle 7, and the wind speed High, the momentum is large, and there is still a large momentum after the wind collides, which can form a jet area as shown in Figure 6, preventing the smoke from entering the safe area.

In addition, studies have shown that when the total air volume is constant, the air supply speed of the first nozzle 3 increases, and the air supply speed of the second nozzle 4 decreases; otherwise, the speed of the first nozzle 3 decreases, and the air supply speed of the second nozzle 4 The wind speed increases. When the air supply speed of the first nozzle 3 is increased, the "shielding" effect of the first nozzle 3 on the smoke will be strengthened, while the air supply speed of the second nozzle 4 will be reduced, and the driving effect on the smoke will be reduced . On the contrary, the "shielding" effect of the first nozzle 3 on the smoke will be reduced, while the driving effect of the second nozzle 4 on the smoke will be strengthened. Therefore, the ratio of the air supply speed between the first nozzle 3 and the second nozzle 4 has an optimal value. Studies have shown that when the ratio of the air supply speed between the first nozzle 3 and the second nozzle 4 reaches 5:1, the smoke protection area The concentration of C0 inside is the smallest, see Figure 7. Similarly, it can be seen that the optimal value of the air supply speed ratio between the third nozzle 6 and the fourth nozzle 7 is also 5:1. The air supply area of the first nozzle 3, the second nozzle 4, the third nozzle 6, and the fourth nozzle 7 can be obtained through the air supply speed ratio, that is, the area at the outlet of the expanding nozzle and the area at the outlet of the first nozzle 3 The ratio is 5 to 1, and the ratio of the area at the outlet of the gradually expanding nozzle to the area at the outlet of the third nozzle 6 is 5 to 1. In turn, the area ratio at the outlet of each associated nozzle can be determined.

Combining with Figure 9, research shows that the angle between the air outlet direction of the first nozzle 3, the third nozzle 6, and the fifth nozzle 2 and the vertical direction is too large, the converging point is too far away from the air supply position, and the smoke is easy to infiltrate. Leak to positive pressure area. If the included angle is too small, the wind speed in the horizontal direction is too small, which will also easily cause smoke leakage. After the research of the applicant, it is found that when the angle between the air outlet direction of the first nozzle 3, the third nozzle 6, and the fifth nozzle 2 and the vertical direction is between 1° and 5°, the system can operate in a good air delivery mode. Prevent smoke from entering the safe area under wind effect.

The positive pressure zone formed by the second nozzle 4 and the fourth nozzle 7 cooperates with the jet flow zone formed by the first nozzle 3 and the third nozzle 6 , and both are indispensable.

First of all, even if the second nozzle 4 and the fourth nozzle 7 can form a positive pressure zone, due to the pulsation of the smoke, part of the smoke will continuously enter the positive pressure zone and be continuously pressed out by the pressure in the positive pressure zone. This will form a dynamic balance, that is, smoke will enter continuously, and smoke will be discharged if it does not work. This leads to the existence of smoke all the time in the smoke protection area, which will cause personal property damage. When the jet area formed by the first nozzle 3 and the third nozzle 6 is added, the jet area will shield the smoke that wants to enter the smoke protection zone. Most of the flue gas is isolated, and the flue gas that slips through the screen will eventually be discharged by the positive pressure in the positive pressure area.

Secondly, although the jet area can effectively shield the smoke, due to the pulsation of the smoke, its shielding effect is not 100%, which makes a part of the smoke directly enter the smoke protection zone.

All in all, the jet flow area is equivalent to the gate of the positive pressure area, which effectively removes most of the smoke first, while the positive pressure area is equivalent to the strong backing of the jet flow area, eliminating a small amount of delay due to the flue gas pulsation.

When the safety escape system of the present invention is installed in a building, the first static pressure box and the second static pressure box are concealed respectively on the suspended ceiling and the floor at the edge of the L-shaped building component.

Example:

Specific embodiments of the present invention are given below, and it should be noted that the present invention is not limited to this embodiment, and all equivalent transformations made on the basis of the technical solutions of the present application all fall within the scope of protection of the present invention.

Follow the above technical solution, with reference to Fig. 2 and Fig. 3,

The size of the first static pressure box and the second static pressure box are both 30m×0.6m×0.4m, and the diameter of the ventilation pipe 8 is 0.3m×0.3m;

The ratio of the outlet area of the gradually expanding nozzle installed at the second nozzle 4 to the area of the outlet of the first nozzle 3 is 5:1, and under the same air supply source, the corresponding air velocity ratio of the two is 1:5. Then when the area of the first nozzle 3 is 30m×0.1m, the area of the second nozzle 4 is 30m×0.5m. Similarly, the area of the third nozzle 6 is 30m×0.1m, and the area of the fourth nozzle 7 is 30m×0.5m ;

The total air supply volume of the whole system is 12m ³ /s, the air supply speed of the first nozzle 3 and the third nozzle 6 is 1m/s, the air supply volume is 3m ³ /s, the second nozzle 4 and the fourth nozzle 7 supply air The speed is 0.2m/s, and the air supply volume is also 3m ³ /s. The second nozzle 4 and the fourth nozzle 7 are perpendicular to the static pressure tank, and the angle between the air outlet direction of the first nozzle 3 and the third nozzle 6 and the vertical direction is the same and is 3°.

The following is the comparative experimental effect provided by the inventor on this application and the 201010580513.6 patent application. The experiment was carried out under the conditions of the same smoke exhaust volume, the same plenum chamber size, the same fire source location and the same heat release rate.

(1) From the point of view of the blocking rate of the smoke, because the present invention effectively eliminates the smoke that has entered the smoke prevention area and stops the smoke from entering through the mutual cooperation of the positive pressure area and the jet flow area, see Figure 8, this is relatively It has more advantages than the 201010580513.6 patent application which can only block smoke. As shown in Figure 10, no positive pressure zone was formed in the system in the 201010580513.6 application, while the positive pressure zone of the system of the present invention can more effectively block smoke and maintain a lower smoke concentration in the escape area; at the same time, as shown As shown in 11, with the elapse of the fire time, due to the increase of smoke turbulence, the smoke entering the smoke prevention area in the system applied for in 201010580513. The smoke concentration in the smoke prevention area is maintained at a constant value, which is obviously lower than that in the system of the 201010580513.6 application.

(2) In terms of manufacturing price, the number of main nozzles in this application has four, and the system that is less than 201010580513.6 has six nozzles, which makes the air output of this application less than 30% under the same conditions than the original system, Furthermore, the fans required by the entire system can also be changed from the original large models to the current small models, and the initial investment of the overall system can be reduced by more than 20%. In terms of operating efficiency, and because the air volume requirement is smaller, the operating efficiency is higher, and the power consumption of the system is relatively reduced during operation.

Claims (4)

1. A safety escape system for an L-shaped building component side airflow closed channel, characterized in that: It includes an L-shaped first plenum box (1) and an L-shaped second plenum box (5), the first plenum box (1) and the second plenum box (5) are arranged up and down opposite and parallel, and the first The static pressure box (1) and the second static pressure box (5) are connected through a ventilation duct (8), and the ventilation duct (8) is provided with an air inlet (9); A first spout (3) and a second spout (4) are provided on the surface of the first plenum (1) opposite to the second plenum (5), and the corner of the first plenum (1) A fifth nozzle (2) is provided on the outside, and the first nozzle (3) is adjacent to the fifth nozzle (2); A third nozzle (6) and a fourth nozzle (7) are provided on the surface of the second static pressure tank (5) opposite to the first static pressure tank (1); in: The first nozzle (3) and the third nozzle (6) are arranged symmetrically up and down; The angle between the air outlet direction of the first nozzle (3) and the vertical direction is 1° to 5°, and the angle between the air outlet direction of the third nozzle (6) and the vertical direction is 1° to 5°. °, and the angle between the wind direction of the first nozzle (3) and the vertical direction is the same as the angle between the direction of the wind of the third nozzle (6) and the vertical direction; The air outlet direction of the fifth nozzle (2), the wind outlet direction of the first nozzle (3) and the wind outlet direction of the third nozzle (6) intersect on the same line; The second spout (4) and the fourth spout (7) are vertically opposite to each other, and the air outlet direction of the second spout (4) is vertical to that of the fourth spout (7). 2. The safety escape system according to claim 1, characterized in that, the second spout (4) and the fourth spout (7) are equipped with gradually expanding nozzles, and the outlet of the gradually expanding nozzles is connected to the The area ratio at the entrance of the diverging nozzle is 5 to 1. 3. The safety escape system according to claim 2, characterized in that, the area at the exit of the first spout (3) is the same as the area at the exit of the third spout (6), and the exit of the gradually expanding spout The area ratio of the area and the area at the outlet of the first nozzle (3) is 5 to 1. 4. The safety escape system according to claim 1, characterized in that, the longitudinal distance between the first spout (3) and the third spout (6) is less than or equal to 3m, and the second spout (4) and the fourth spout The longitudinal distance between the spouts (7) is less than or equal to 3m.

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