CN102538121B - Safe evacuation system for airflow closed channel in middle of L-shaped building element - Google Patents
Safe evacuation system for airflow closed channel in middle of L-shaped building element Download PDFInfo
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- CN102538121B CN102538121B CN 201110415567 CN201110415567A CN102538121B CN 102538121 B CN102538121 B CN 102538121B CN 201110415567 CN201110415567 CN 201110415567 CN 201110415567 A CN201110415567 A CN 201110415567A CN 102538121 B CN102538121 B CN 102538121B
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Abstract
The invention discloses a safe evacuation system for an airflow closed channel in middle of an L-shaped building element. The evacuation system comprises an L-shaped first static pressure box and an L-shaped static pressure box, wherein the first static pressure box and the second static pressure box are oppositely arranged in parallel; the first static pressure box and the second static pressure are communicated through a ventilation pipe; an air inlet connected with the fan is arranged on the ventilation pipe; a first nozzle and a fourth nozzle, a second nozzle and a fifth nozzle, a third nozzle and a sixth nozzle which blow air oppositely two by two mutually are arranged on the opposite surface of the first static pressure box and the second static pressure box so as to form a jet flow area and a positive pressure area, so that the smoke is prevented from entering the safe area. Due to the specific design of the safe evacuation system of the airflow closed channel in the middle of the L-shaped building element, three groups of collision airflow can be generated so as to form piston flow by collision among airflows, therefore, the smoke in the special area is expelled, so that a safe and clean channel is produced at the side of the L-shaped building element.
Description
Technical field
The present invention relates to the personnel escape system in a kind of building, relate in particular to a kind of L-type building element safe evacuation system for airflow closed channel in middle.
Background technology
After occuring, fire can produce a large amount of flue gases, and the main cause of death of high-temperature flue gas when being breaking out of fire.Because flue gas is higher than environment temperature, the relative air of its density will be little.The little smoke density of comparing with surrounding air can produce buoyancy, causes flue gas to move up.When flue gas moves upward when running into ceiling, because the flue gas of rear contact ceiling contacts the flue gas of ceiling before can pushing.This has just caused flue gas to move horizontally along ceiling, is breakneck when flue gas studies show that moving horizontally of this flue gas, because it can take flue gas to each place of building element.
Studies show that for building element or tier building owing to the accumulation of flue gas in top of space, smoke height can constantly reduce.This will compress personnel escape's space largely, referring to Fig. 1.Personnel in this can cause building are difficult to escape.Thereby cause great personnel's property loss.If after fire occurs, can in building, form a zone clean, that low temperature does not namely have flue gas yet by various technological means, will make things convenient for largely the personnel escape.The personal security of improvement after fire occurs.Thereby reduce to greatest extent personnel's property loss.
Correlative study shows, at present without any a kind of smoke control system can 100% eliminating because the caused fire smoke of fire.Existing building element fume-resisting system mainly adopts the mode that the smoke evacuation air port is set at building top to discharge fume, thereby the flue gas in the building is diluted, thereby reduces indoor flue gas concentration, but at present there is following problem in prior art:
(1) flue gas dilution is not whole eliminatings, still have the flue gas of the overwhelming majority to be present in the building, and this part flue gas can cause personnel's property loss equally.
(2) the flue gas dilution effect is not directly to depend on the smoke exhaust fan watt level, because the effect of smoke exhaust fan draft, can form negative pressure in building, namely the building internal pressure is larger than pressure outside, and high-power in the case smoke exhaust fan also can't be extracted flue gas out fully in building.
The simple mode technical disadvantages of discharging fume by the smoke evacuation air port for prior art, the applicant has applied for a patent of invention in 2010, its name is called a kind of smoke protection system for stairwell (number of patent application: 201010580513.6) prior art is improved, the applicant is in line with the scientific idea of " stifled not as dredging ", by six independently " jet " spout produced an opposed jets district, thereby effectively stoped entering of flue gas, finally reached the effect of Smoke prevention.
Along with the further research of applicant to this problem, the applicant finds that also there is following technological deficiency in said system:
(1) although can stop flue gas to enter the protection zone by " jet " spout in first to file.But because flue gas has turbulance, stochastic volatility, this so that flue gas itself vary with respect to each spout air-out speed.Thereby cause this smoke protection system for stairwell that flue gas stopped only 70%-80%(percent by volume of rate), therefore remaining 20%-30%(percent by volume) flue gas can enter the Smoke prevention protection zone of this patent.
(2) can't get rid of process " jet " spout in first to file and hit the flue gas of fluerics, on the contrary, because up and down a plurality of efflux nozzle effect meeting is accelerated by hitting the diffusion of fluerics flue gas.
(3) because can't be to getting rid of by the flue gas of head-on collision fluerics in first to file, so its main purpose of design be to strengthen fume-resisting system to the barrier effectiveness of flue gas.Be provided with altogether three pairs of six spouts at first to file fume-resisting system efflux nozzle, we find the research practice by the later stage, initial outlay fund, manufacture difficulty and operating cost in the technological improvement design increase system of first to file.
Summary of the invention
Defective or deficiency for prior art, the object of the present invention is to provide a kind of L-type building element safe evacuation system for airflow closed channel in middle, with when the breaking out of fire, effectively stop flue gas to spread toward the L-type building element, but for wrecked personnel provide an escape unharmed without cigarette channel.
For realizing above-mentioned technical assignment, the present invention adopts as following technical scheme is achieved:
A kind of L-type building element safe evacuation system for airflow closed channel in middle, it is characterized in that, comprise the first plenum chamber of L-type and the second plenum chamber of L-type, the first plenum chamber and the second plenum chamber are relative and be arranged in parallel up and down, be connected by ventilation shaft between the first plenum chamber and the second plenum chamber, be provided with air inlet on the ventilation shaft;
The face relative with the second plenum chamber of the first plenum chamber is provided with the first spout, the second spout and the 3rd spout, and the second spout is between the first spout and the 3rd spout, and the outside at the first plenum chamber turning is provided with the 7th spout, and the 7th spout is adjacent with the first spout;
The face relative with the first plenum chamber of the second plenum chamber is provided with the 4th spout, the 5th spout and the 6th spout, wherein: be symmetrical arranged under the 4th spout and the first spout, be oppositely arranged under the 5th spout and the second spout, be symmetrical arranged under the 6th spout and the 3rd spout;
The air-out of described the first spout is 1 °～5 ° towards the angle with vertical direction, the air-out of the 4th spout is 1 °～5 ° towards the angle with vertical direction, the air-out of the first spout towards with the air-out of the angle of vertical direction and the 4th spout towards identical with the angle of vertical direction, the air-out of the 7th spout towards the air-out of, the first spout towards with the air-out of the 4th spout towards intersecting at the same line;
The air-out of described the second spout towards with the air-out of the 5th spout towards being vertical direction and both are relative;
The air-out of described the 3rd spout is 1 °～5 ° towards the angle with vertical direction, the air-out of described the 6th spout is 1 °～5 ° towards the angle with vertical direction, the air-out of the 3rd spout towards with the air-out of the angle of vertical direction and the 6th spout towards identical with the angle of vertical direction, the air-out of the 3rd spout towards with the air-out of the 6th spout towards intersecting.
Other technologies of the present invention are characterized as:
Described the second spout and the 5th spout all are equipped with flaring type spout, and the Area Ratio of flaring type spout exit and flaring type spout porch is 5 to 1.
Described the first spout exit area, the 3rd spout exit area, the 4th spout exit area are identical with the 6th spout exit area; The area in described flaring type spout exit is 5 to 1 with the Area Ratio in the first spout exit.
Distance between described the 4th spout and the first spout on the vertical direction is less than or equal to 3m, and the distance between the 5th spout and the second spout on the vertical direction is less than or equal to 3m, and the distance between the 6th spout and the 3rd spout on the vertical direction is less than or equal to 3m.
The unique design of security escape system of the present invention can produce three groups of air streams of mutual head-on collision.Wherein, utilize two groups of high velocity airs from the discharge of plenum chamber avris to form the fluerics to blowing, enter building element to stop flue gas.Adopt simultaneously one group of low speed flow of discharging from plenum chamber middle part to blowing the formation zone of positive pressure, with " backing " as the Smoke prevention of fluerics, the increase system to flue gas stop rate in will get rid of because of the flue gas that the turbulance effect enters in the flue gas protection zone.
The present invention has following advantage:
(1) system of the present invention is because the effect of zone of positive pressure can effectively be got rid of the flue gas that enters in this zone, rather than only stop flue gas to enter, and its flue gas stops that rate is near 100%.
(2) system of the present invention does not account for architectural volume in actual installation, and the parts that also do not add when the personnel escape stop escape.
(3) system cost of the present invention is low, and system is simple, and the installation process is simple.
Description of drawings
Fig. 1 (a1) and Fig. 1 (a2) are respectively fire when rear 60 seconds and 180 seconds occur, the flue gas concentration distribution schematic diagram in the L-type building element on the longitudinal section, burning things which may cause a fire disaster 15m place;
Fig. 1 (b1) and Fig. 1 (b2) are respectively fire when rear 60 seconds and 180 seconds occur, the flue gas concentration distribution schematic diagram in the L-type building element on the longitudinal section, burning things which may cause a fire disaster 10m place;
Fig. 1 (c1) and Fig. 1 (c2) are respectively fire when rear 60 seconds and 180 seconds occur, the flue gas concentration distribution schematic diagram in the L-type building element on the longitudinal section, burning things which may cause a fire disaster 5m place;
Fig. 2 is the structural representation of security escape system of the present invention;
Fig. 3 (a) is the A-A cutaway view of Fig. 2, and Fig. 3 (b) is the B-B cutaway view of Fig. 2;
The outlet of Fig. 4 flaring type spout is analyzed schematic diagram with inlet area than calculation optimization;
Fig. 5 is up and down relatively between the spout under the different fore-and-aft distance, the flue gas concentration schematic diagram in the Smoke prevention protection zone;
Fig. 6 is L-type building element safe evacuation system for airflow closed channel in middle air-out direction schematic diagram of the present invention;
Fig. 7 is that schematic diagram is analyzed in the optimization of flaring type spout and the first nozzle outlet air supply velocity ratio;
Fig. 8 (a1) and Fig. 8 (a2) are respectively fire when rear 60 seconds and 180 seconds occur, and the flue gas concentration distribution schematic diagram on the longitudinal section, burning things which may cause a fire disaster 15m place is installed in the L-type building element after the system of the present invention;
Fig. 8 (b1) and Fig. 8 (b2) are respectively fire when rear 60 seconds and 180 seconds occur, and the flue gas concentration distribution schematic diagram on the longitudinal section, burning things which may cause a fire disaster 10m place is installed in the L-type building element after the system of the present invention;
Fig. 8 (c1) and Fig. 8 (c2) are respectively fire when rear 60 seconds and 180 seconds occur, and the flue gas concentration distribution schematic diagram on the longitudinal section, burning things which may cause a fire disaster 5m place is installed in the L-type building element after the system of the present invention;
After Fig. 8 (d) installs system of the present invention, the flue gas concentration distribution schematic diagram when fire occurs rear 240 seconds on the 2m At The Height cross section of ground;
Fig. 9 is under the different angles from vertical direction of spout, and fume-resisting system stops the rate schematic diagram to flue gas;
Figure 10 is the flue gas concentration distribution schematic diagram in first to file " smoke protection system for stairwell (201010580513.6) ";
Figure 11 is the application and flue gas concentration velocity field contrast schematic diagram in first to file " smoke protection system for stairwell (201010580513.6) ".
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in more detail.
The specific embodiment
L-type building element among the present invention refers to the interior construction spacing Constitution Elements, such as the L-type Zhongting, and L-type corridor, L-type platform etc.
Such as Fig. 2, shown in Figure 3, L-type building element safe evacuation system for airflow closed channel in middle of the present invention comprises the first plenum chamber 1 of L-type and the second plenum chamber 9 of L-type, the first plenum chamber 1 and the second plenum chamber 9 are relative and be arranged in parallel up and down, be connected by ventilation shaft 10 between the first plenum chamber 1 and the second plenum chamber 9, be provided with the air inlet 11 that is connected with blower fan on the ventilation shaft 10; The face relative with the second plenum chamber 9 of the first plenum chamber 1 is provided with the first spout 3, the second spout 4 and the 3rd spout 5, the second spout 4 is between the first spout 3 and the 3rd spout 5, it is adjacent with the first spout 3 that the outside at the first plenum chamber 1 turning is provided with the 7th spout 2, the seven spouts 2; The face relative with the first plenum chamber 1 of the second plenum chamber 9 is provided with the 4th spout 6, the 5th spout 7 and the 6th spout 8, wherein: be symmetrical arranged on the 4th spout 6 and the first spout 3 times, be oppositely arranged on the 5th spout 7 and the second spout 4 times, be symmetrical arranged on the 6th spout 8 and the 3rd spout 5 times; The air-out of described the first spout 3 is 1 °～5 ° towards the angle with vertical direction, the air-out of the 4th spout 6 is 1 °～5 ° towards the angle with vertical direction, the air-out of the first spout 3 towards with the air-out of the angle of vertical direction and the 4th spout 6 towards identical with the angle of vertical direction, the air-out of the 7th spout 2 towards the air-out of, the first spout 3 towards with the air-out of the 4th spout 6 towards intersecting at the same line; The air-out of described the second spout 4 towards with the air-out of the 5th spout 7 towards being vertical direction and both are relative; The air-out of described the 3rd spout 5 is 1 °～5 ° towards the angle with vertical direction, the air-out of described the 6th spout 8 is 1 °～5 ° towards the angle with vertical direction, the air-out of the 3rd spout 5 towards with the air-out of the angle of vertical direction and the 6th spout 8 towards identical with the angle of vertical direction, the air-out of the 3rd spout 5 towards with the air-out of the 6th spout 8 towards intersecting.
Above-mentioned the second spout 4 and the 5th spout 7 all are equipped with flaring type spout, and the Area Ratio of flaring type spout exit and flaring type spout porch is 5 to 1.
The first spout 3 exit areas, the 3rd spout 5 exit areas, the 4th spout 6 exit areas are identical with the 6th spout 8 exit areas; The area in above-mentioned flaring type spout exit is 5 to 1 with the Area Ratio in the exit of the first spout 3.
The 5th spout 7 of the present invention and the second spout 4 places are flaring type spout, and the Area Ratio of flaring type spout exit and porch is 5:1.Ratio is larger, and then to be converted into static pressure more thorough in the dynamic pressure in spout exit, and then can bring larger static pressure, thereby forms more good zone of positive pressure, then better gets rid of to enter its inner flue gas; But excessive discharge area can be with larger cost, and when the Area Ratio of flaring type spout exit and porch was 5:1, technical ability guaranteed that good dynamic pressure is converted into the static pressure ratio, can guarantee that again cost is incessantly too high.The schematic diagram of cost and dynamic pressure transformation efficiency ratio is seen Fig. 4.As seen from the figure, optimum flaring type spout exit and the Area Ratio of porch are 5:1, also are the selected ratio of the present invention.
Distance between above-mentioned the 4th spout 6 and the first spout 3 on the vertical direction is less than or equal to 3m, and the distance between the 5th spout 7 and the second spout 4 on the vertical direction is less than or equal to 3m, and the distance between the 6th spout 8 and the 3rd spout 5 on the vertical direction is less than or equal to 3m.
Air quantity one regularly, the fore-and-aft distance between the spout is crossed the jet that conference causes this spout to spray and can not be clashed, thereby can not form fluerics and zone of positive pressure, then can not effectively get rid of flue gas.Fig. 5 represents along with the increasing of spout longitudinal pitch and causes the flue gas in the Smoke prevention protection zone to change.Can find out that the flue gas concentration behind spacing 3m obviously increases.So in this application, the longitudinal pitch of getting between spout is that little giving equals 3m, and this distance range can guarantee the exit flow collision, and then guarantee the formation that zone of positive pressure and jet go, the final flue gas of effectively discharging.
When fire occurs, the outer clean air of blower fan suction chamber is sent into the first plenum chamber 1 and the second plenum chamber 9 by ventilation shaft, behind plenum chamber, the dynamic pressure of the air in the ventilation shaft changes static pressure into, so that air is outside discharged to the safety zone from the first spout 3 with certain position relation and the 4th spout 6, the 3rd spout 5 and the 6th spout 8, the 7th spout 2, enter the safety zone from the second spout 4 and the 5th spout 7, effectively intercept and get rid of flue gas in the building element passage.
Analyze theoretically, the wind of any direction can resolve into according to the vector principle stack of the wind of the directions X, Y-direction and the Z direction that vary in size, and is 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) velocity function of x direction respectively, v1 (y), v2 (y) represent the velocity function of y direction, w1 (z), w2 (z) represent the velocity function of z direction, and i is that x direction footmark, j are that y direction footmark, k are z direction footmark;
After wind speed WS1 and the WS2 stack be:
WS3（x,y,z）=[u1（x）+u2（x）]i+[v1(y)+v2(y)]j+[w1(z)+w2(z)]k
When two differences are come the wind facies collision of flow path direction, if do not have the velocity component of Z direction, when the velocity magnitude of Y-direction equates, have:
WS3（x,y,z）=[u1（x）+u2（x）]i+[v1(y)-v2(y)]j+[0+0]k
=2×u1（x）i
The wind speed of vertical direction is offset the wind speed of remaining horizontal direction after the collision of the wind comes from the above-mentioned different directions; So after the simultaneously high-speed air flow head-on collision because the excessive loss of momentum of momentum less with respect to itself entrained momentum, this is just so that the rear dynamic pressure conversion of upper and lower sides high speed air-out head-on collision static pressure is incomplete, thereby form to the member movement outside plug-flow, form afterwards the mixed zone.
The present invention is based on above-mentioned principle, the first spout 3 and the 4th spout 6 that are positioned at plenum chamber one avris are symmetrical arranged up and down, the 3rd spout 5 and the 6th spout 8 that are positioned at another avris of plenum chamber are symmetrical arranged up and down, and all adopt the tilting air-out, the air-out that realizes the first spout 3 and the 4th spout 6 collides, the air-out of the 3rd spout 5 and the 6th spout 8 collides, offset the vertical velocity component of air-out, the stack horizontal velocity component, and the air-out speed of the two the enough large air slide that forms horizontal direction is passed, and stops that flue gas enters L-type member middle part and the upper space of incoming flow flue gas in its sphere of action entrainmented; Simultaneously the present invention adopts on the 5th spout 7 and the second spout 4 times and is oppositely arranged and all adopts vertical air-out, the second spout 4 and the large air-out speed of the 5th spout 7 areas are little and be in the head-on collision form, entrained dynamic pressure or the momentum of fluid itself has greatly loss after the head-on collision up and down, and the dynamic pressure of this part loss or momentum can be converted into this zone with respect to the pressure differential in the whole passage, thereby the formation zone of positive pressure, as shown in Figure 6.Such the first spout 3 and the 4th spout 6 formed head-on collision jets, the 3rd spout 5 and the 6th spout 8 formed head-on collision jets can effectively intercept flue gas and enter the safety zone; The second spout 4 and the formed zone of positive pressure of the 5th spout 7 effects can be driven away the flue gas that enters the safety zone out simultaneously.
In addition, because the air-out meeting is collided with the turning wall, cause the loss of momentum, thereby reduce the effect that flue gas is dredged, therefore add the 7th spout 2 in outside, passage turning, and the air-out of the 7th spout 2 towards with the air-out of the first spout 3 and the 4th spout 6 towards intersecting at a line, will increase like this air-out momentum of corner, formation has the more piston flow of high thrust, why prevent that flue gas from entering in the safety zone, be because flue gas is to concentrate on the building upper space owing to the buoyancy major part in upper design only.
Can regulate by the size of controlling the spout exit air-out speed of the spout of sharing same wind regime, and the air port size is inversely proportional to its wind speed size, the first spout 3 and the 4th spout 6 among the present invention, the 3rd spout 5 and the 6th spout 8 are all in the outer part, it needs the air-out of higher wind to form a large amount of flue gas that offset the fluerics, and the air-out of the low wind speed of the need of the second spout 4 and the 5th spout 7 forms zone of positive pressure, so the second spout 4 and the 5th spout 7 are the flaring spout, make the second spout 4 and the 5th spout 7 place exit area greater than the first spout 3, the 4th spout 6, the exit area of the 3rd spout 5 and the 6th spout 8, the first spout 3, the 4th spout 6, the 3rd spout 5 and the 6th spout 8 wind speed are larger than the wind speed of the second spout 4 and the 5th spout 7;
The wind speed of the second spout 4 and the 5th spout 7 is difficult for excessive and too small simultaneously, can affect personnel escape's speed when excessive and give discomfort, just can not guarantee fully when too small that flue gas is isolated in outside the zone of positive pressure, be 5 to 1 based on the Area Ratio of the flaring type spout exit among this present invention and porch.And under this Area Ratio, momentum is subdued very fast after the air-out head-on collision, its most of momentum all can be converted into pressure, and then can ensure enough air-out dynamic pressure meetings and change static pressure into, namely the momentum of the overwhelming majority can change air pressure into and form zone of positive pressure, so that the flue gas in the admission passage is discharged the place of safety; The first spout 3, the 4th spout 6, the 3rd spout 5 and the 6th spout 8 are tiny spout with respect to the second spout 4 and the 5th spout 7, its air-out speed is high, and momentum is large, still has larger momentum after the air-out head-on collision, can form fluerics as shown in Figure 6, stop that flue gas enters the safety zone.
In addition, studies show that in the certain situation of total blast volume, the first spout 3 air supply velocities strengthen, then the second spout 4 air supply velocities reduce, otherwise the first spout 3 speed reduce, and then the second spout 4 air supply velocities increase.When the first spout 3 speed strengthened, " shielding " of 3 pairs of flue gases of the first spout effect will be strengthened, and the second spout 4 air supply velocities reduce, and then will reduce the effect of driveing of flue gas.Otherwise " shielding " effect of 3 pairs of flue gases of the first spout will reduce, and the effect of driveing of 4 pairs of flue gases of the second spout will be strengthened.So the air supply velocity ratio of the first spout 3 and the second spout 4 has an optimal value, studies show that when the air supply velocity ratio of the first spout 3 and the second spout 4 reached 5:1, the CO concentration in the Smoke prevention protection zone was minimum, sees Fig. 7.In like manner, the air supply velocity of the 3rd spout 5 and the second spout 4 also is 5:1 than optimal value, and the wind speed of the 4th spout 6 and the 5th spout 7 is 5:1 than optimal value, the custom between the 6th spout 8 and the 5th spout 7 than optimum be 5:1.And then can determine the Area Ratio in each relevant spout exit.
In conjunction with Fig. 9, studies show that the first spout 3, the 4th spout 6, the 3rd spout 5, the 6th spout 8 are excessive with the angle of vertical direction, then to depart from air supply position excessively far away for convergent point, and flue gas leaks out to zone of positive pressure easily.If angle is too small, then too small towards the wind speed of horizontal direction, cause equally easily the flue gas seepage.Research through the Patent design people finds, when the angle of the air-out direction of the first spout 3, the 4th spout 6, the 3rd spout 5, the 6th spout 8 and vertical direction was between 1 °～5 °, native system can prevent that flue gas from entering the place of safety under good air-supply effect.
The second spout 4 and the 5th spout 7 formed zone of positive pressures and the first spout 3 and the 4th spout 6 and the 3rd spout 5 and the 6th spout 8 the fluerics that forms respectively cooperatively interact, indispensable.
At first, even the second spout 4 and the 5th spout 7 can form zone of positive pressure, because the pulsating nature of flue gas, partial fume can constantly enter zone of positive pressure, is constantly extruded by the pressure in the zone of positive pressure again.This will form a dynamic equilibrium, also, ceaselessly has flue gas to enter, and the not all right flue gas that has is excluded.This just causes having all the time in the Smoke prevention protection zone flue gas to exist, and this part flue gas can cause personnel's property loss.When add the first spout 3 and the 4th spout 6 and the 3rd spout 5 and the 6th spout 8 distinguish formed fluerics after; shielding action can be played to the flue gas of wanting to enter in the Smoke prevention protection zone in the fluerics; isolated most of flue gas, and the flue gas of slipping through the net finally can be got rid of by the malleation in the zone of positive pressure.
Secondly, although the fluerics can effectively shield flue gas, because the effect of flue gas pulsating nature, its shield effectiveness is not 100%, this with regard to so that part of smoke can directly enter in the Smoke prevention protection zone.
Generally speaking, the fluerics is equivalent to the gate of zone of positive pressure, effectively gets rid of first most flue gas.Zone of positive pressure then is equivalent to the strong backing of fluerics, gets rid of because a small amount of extension that the flue gas pulsating nature enters.Fluerics and zone of positive pressure are indispensable.Both are complementary.
When security escape system of the present invention is installed under construction wherein the first plenum chamber and the second plenum chamber respectively concealed installation on the furred ceiling and floor of L-type building element limit section.
Embodiment:
Below provide specific embodiments of the invention, need to prove that the present invention is not limited to following specific embodiment, all equivalents of doing on present techniques scheme basis all fall into protection scope of the present invention.
Defer to technique scheme, as depicted in figs. 1 and 2.
Wherein the size of the first plenum chamber and the second plenum chamber is 30m * 0.6m * 0.4m, and the ventilation shaft caliber is 0.3m * 0.3m.
Defer to the aforementioned techniques scheme, the area when the first spout 3 exits is 30m * 0.1m, and then the area in the flaring type spout exit at the second spout 4 places is 30m * 0.5m.The air supply velocity of the first spout 3, the 3rd spout 5, the 4th spout 6 and the 6th spout 8 is 1m/s, and air output is 3m
3/ s, the air supply velocity of the second spout 4 and the 5th spout 7 is 0.2m/s.Air output is for also being 3m
3/ s.
Total air output of whole system is 18m
3/ s.The second spout 4 is vertical with plenum chamber with the 5th spout 7, and the air-out direction of the first spout 3, the 3rd spout 5, the 4th spout 6 and the 6th spout 8 is identical with the angle of vertical direction and be 3 °.
It below is the contrast experiment's effect about the application and 201010580513.6 patent applications that the inventor provides.Experiment is to carry out under identical exhaust smoke level, identical plenum chamber size, identical fire location and identical rate of heat release condition.
From the rate that stops to flue gas, because the present invention can stop effectively that by cooperatively interacting of zone of positive pressure and fluerics flue gas enters, the flue gas that enters can be got rid of again, see Fig. 8.This compares smoke protection system for stairwell (201010580513.6) can only stop that flue gas more has superiority.Because smoke protection system for stairwell (201010580513.6) can not form zone of positive pressure at all, see Figure 10.So the application is better to stopping of flue gas, the flue gas concentration in the protection zone is lower.As shown in figure 11, original system " smoke protection system for stairwell (201010580513.6) ",, strengthens when flue gas concentration pursues so the flue gas that enters in the Smoke prevention zone is more because the flue gas turbulance strengthens along with the passing of the duration of ignition.The application does not then have the impact of this respect, and along with the passing of the duration of ignition, the flue gas concentration in the Smoke prevention zone maintains a steady state value, and obviously low than original system.Illustrate the application by the flaring type to blowing mouth and common air port to blow the zone of positive pressure that forms respectively compare existing common air port with the fluerics and more have superiority to blowing, flue gas stopped that rate is larger.
Claims (4)
1. L-type building element safe evacuation system for airflow closed channel in middle, it is characterized in that, comprise first plenum chamber (1) of L-type and second plenum chamber (9) of L-type, the first plenum chamber (1) and the second plenum chamber (9) are relative and be arranged in parallel up and down, be connected by ventilation shaft (10) between the first plenum chamber (1) and the second plenum chamber (9), be provided with air inlet (11) on the ventilation shaft (10);
The face relative with the second plenum chamber (9) of the first plenum chamber (1) is provided with the first spout (3), the second spout (4) and the 3rd spout (5), the second spout (4) is positioned between the first spout (3) and the 3rd spout (5), the outside at the first plenum chamber (1) turning is provided with the 7th spout (2), and the 7th spout (2) is adjacent with the first spout (3);
The face relative with the first plenum chamber (1) of the second plenum chamber (9) is provided with the 4th spout (6), the 5th spout (7) and the 6th spout (8), wherein: be symmetrical arranged on the 4th spout (6) and the first spout (3) are lower, be oppositely arranged on the 5th spout (7) is lower with the second spout (4), be symmetrical arranged on the 6th spout (8) and the 3rd spout (5) are lower;
The air-out of described the first spout (3) is 1 °～5 ° towards the angle with vertical direction, the air-out of the 4th spout (6) is 1 °～5 ° towards the angle with vertical direction, the air-out of the first spout (3) towards with the air-out of the angle of vertical direction and the 4th spout (6) towards identical with the angle of vertical direction, the air-out of the 7th spout (2) towards the air-out of, the first spout (3) towards with the air-out of the 4th spout (6) towards intersecting at the same line;
The air-out of described the second spout (4) towards with the air-out of the 5th spout (7) towards being vertical direction and both are relative;
The air-out of described the 3rd spout (5) is 1 °～5 ° towards the angle with vertical direction, the air-out of described the 6th spout (8) is 1 °～5 ° towards the angle with vertical direction, the air-out of the 3rd spout (5) towards with the air-out of the angle of vertical direction and the 6th spout (8) towards identical with the angle of vertical direction, the air-out of the 3rd spout (5) towards with the air-out of the 6th spout (8) towards intersecting.
2. security escape system as claimed in claim 1 is characterized in that, described the second spout (4) and the 5th spout (7) all are equipped with flaring type spout, and the Area Ratio of flaring type spout exit and flaring type spout porch is 5 to 1.
3. security escape system as claimed in claim 2, it is characterized in that described the first spout (3) exit area, the 3rd spout (5) exit area, the 4th spout (6) exit area are identical with the 6th spout (8) exit area; The area in described flaring type spout exit and the Area Ratio in the first spout (3) exit are 5 to 1.
4. security escape system as claimed in claim 1, it is characterized in that, distance between described the 4th spout (6) and the first spout (3) on the vertical direction is less than or equal to 3m, distance between the 5th spout (7) and the second spout (4) on the vertical direction is less than or equal to 3m, and the distance between the 6th spout (8) and the 3rd spout (5) on the vertical direction is less than or equal to 3m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110415567 CN102538121B (en) | 2011-12-13 | 2011-12-13 | Safe evacuation system for airflow closed channel in middle of L-shaped building element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110415567 CN102538121B (en) | 2011-12-13 | 2011-12-13 | Safe evacuation system for airflow closed channel in middle of L-shaped building element |
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| Publication Number | Publication Date |
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| CN102538121A CN102538121A (en) | 2012-07-04 |
| CN102538121B true CN102538121B (en) | 2013-10-23 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2194468Y (en) * | 1994-05-21 | 1995-04-12 | 徐振昌 | Multi-function exhausting hood |
| CN100396347C (en) * | 2004-05-21 | 2008-06-25 | 南京工业大学 | Fire smoke-proof air curtain system with additional power |
| CN102003766B (en) * | 2010-12-09 | 2013-10-23 | 西安建筑科技大学 | Smoke protection system for stairwell |
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| CN102538121A (en) | 2012-07-04 |
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