A fire-fighting smoke extraction system

Abstract

This invention belongs to the field of smoke exhaust fan technology, and particularly relates to a fire-fighting smoke exhaust system for preventing fire spread. It includes a smoke exhaust fan and a T-shaped chimney. The T-shaped chimney has three openings; one opening is located inside the building to draw in gases from within the building; another opening is connected to the intake of the smoke exhaust fan via a connecting pipe; and a cooling and extinguishing device is installed on the last opening. In the event of a fire, smoke and fire from inside the building enter the T-shaped chimney through the end located inside the building, and then are discharged outwards from the exhaust fan's outlet along the T-shaped chimney, through the flue, connecting pipe, and smoke exhaust fan. During this process, when fire enters the flue, high-pressure water in the water chamber of the cooling and extinguishing device is sprayed through spray nozzles on the spray plate into the flue below the water chamber, extinguishing the fire entering the flue and simultaneously cooling the passing smoke.

Description

Technical Field

[0001] This invention belongs to the field of smoke exhaust fan technology, and particularly relates to a fire-fighting smoke exhaust system for preventing fire spread. Background Technology

[0002] Fire smoke extraction is a crucial component of building fire protection systems. In the event of a fire, specific systems and equipment are used to promptly remove smoke and toxic gases from the building, providing clear visibility and a safe air environment for evacuation and fire rescue, reducing the harm of smoke to people, and suppressing the spread of fire.

[0003] Fire exhaust systems mainly consist of exhaust fans, exhaust ducts, exhaust outlets, fire dampers, and control devices. Fire dampers automatically close when the smoke temperature inside the duct reaches a certain value to prevent the fire from spreading through the duct. However, if there are still people trapped inside a building that needs to exhaust smoke and toxic gases, and all the fire dampers installed in the exhaust ducts are closed, then the trapped people will be in danger of losing their lives.

[0004] In addition, during a fire, the exhaust fans that power the smoke extraction will suffer some damage to their motors, blades, and casings in the high-temperature environment, which will reduce the lifespan of the exhaust fans and increase the cost of equipment maintenance and installation.

[0005] Secondly, during a fire, the temperature inside the smoke exhaust duct will rise, causing the duct to expand and deform due to the heat. Gaps will appear at the duct connections, resulting in smoke leakage that can spread into other buildings and affect the air quality inside those buildings.

[0006] This invention designs a fire-fighting smoke extraction system to solve the above problems. Summary of the Invention

[0007] Therefore, it is necessary to provide a fire-fighting smoke exhaust system to address the problems existing in current smoke exhaust fans. In the event of a fire, the system can change the flow direction of smoke and fire, and add a cooling and extinguishing device in the added flow direction to achieve the effect of extinguishing fire and cooling down.

[0008] The above objectives are achieved through the following technical solutions:

[0009] A fire-fighting smoke extraction system for preventing fire spread, comprising:

[0010] Smoke exhaust fans are installed on the ventilation openings of buildings.

[0011] A T-shaped chimney has three openings: one opening is located inside the building to draw in gases from within the building; another opening is connected to the intake of an exhaust fan via a connecting tube; and the last opening is equipped with a cooling and fire extinguishing device.

[0012] The cooling and extinguishing device includes a flue and a water storage chamber above the flue, the flue being connected to a T-shaped chimney; a spray plate is installed between the water storage chamber and the flue, the spray plate having spray nozzles; multiple evenly distributed baffles are fixedly installed inside the flue, the baffles having staggered circular drainage holes; a smoke exhaust port is fixedly installed at the rear of the flue, the smoke exhaust port being connected to the air intake of a smoke exhaust fan via a connecting pipe.

[0013] A water collection shell is fixedly installed below the flue, and the area on the lower wall of the flue that overlaps with the water collection shell is perforated; a water inlet is installed at one end of the water collection shell.

[0014] The exhaust fan has an inner cavity in the wall of its outer casing, connecting cylinder, T-shaped chimney, flue, and connecting pipe. Water inlet and drain outlet are installed at the upper ends of the inner cavities. All water inlet interfaces are connected to the water inlet installed on the water collection shell through flexible hoses.

[0015] A second valve is installed at the connection end between the T-shaped chimney and the exhaust fan, and a first valve is installed at the connection end between the T-shaped chimney and the flue; a third valve is installed inside the connecting pipe; the three valves are controlled by a triggering mechanism installed on the side of the T-shaped chimney.

[0016] In one embodiment, a connecting flange is installed on the fan housing of the smoke exhaust fan, and the connecting pipe is connected to the smoke exhaust fan through the connecting flange.

[0017] In one embodiment, an annular protrusion is fixedly installed on the inner rear wall of the connection between the flue and the T-shaped chimney in the cooling and extinguishing device, and the cross-section of the annular protrusion is arc-shaped.

[0018] In one embodiment, spiral guide vanes are installed between the baffles installed inside the flue.

[0019] In one embodiment, the upper end of the water storage chamber can be connected to a fire hydrant inside the building via a water pipe.

[0020] In one embodiment, the exhaust fan has a central flow channel in the middle of the fan housing, connecting cylinder, T-shaped chimney, flue, and connecting pipe; and multiple circular weakening grooves are evenly formed on the wall surface of the inner cavity of the exhaust fan housing, connecting cylinder, T-shaped chimney, flue, and connecting pipe near the central flow channel.

[0021] In one embodiment, the first valve consists of a valve ring fixedly installed on the inner wall of the T-shaped chimney and a valve plate oscillatingly installed within the valve ring, the valve plate being oscillatingly installed on the corresponding valve ring via a fourth rotating shaft; the second valve consists of a valve ring fixedly installed on the inner wall of the T-shaped chimney and a valve plate oscillatingly installed within the valve ring, the valve plate being oscillatingly installed on the corresponding valve ring via a third rotating shaft; the third valve consists of a valve ring fixedly installed on the inner wall of the connecting pipe and a valve plate oscillatingly installed within the valve ring, the valve plate being oscillatingly installed on the corresponding valve ring via a first rotating shaft.

[0022] In one embodiment, a third gear is fixedly mounted on one end of the third rotating shaft, and a fourth gear and a first gear are fixedly mounted on one end of the fourth rotating shaft, with the fourth gear and the third gear meshing; one end of the first rotating shaft is mounted on the cooling and extinguishing device by a fixed support, and a second gear is fixedly mounted on the first rotating shaft, with the second gear meshing with the first gear; the other end of the third rotating shaft is fixedly mounted on the second rotating shaft, and a servo motor is mounted on the side of the T-shaped chimney; the servo motor is connected to the second rotating shaft.

[0023] In one embodiment, a transmission sleeve is fixedly mounted on the output shaft of the servo motor, and a worm spring is installed between the transmission sleeve and the second rotating shaft.

[0024] In one embodiment, an installation sleeve is fixedly installed on the outer wall of the T-shaped chimney. An installation groove is opened inside the installation sleeve, and an installation slide plate and a limiting rod are slidably installed in the installation groove. One end of the limiting rod has a triggering bevel. A slot is opened on the second rotating shaft, and the end of the limiting rod with the triggering bevel engages with the slot on the second rotating shaft. A compression spring is installed between the installation slide plate and the limiting rod. A temperature-sensitive trigger rod is slidably installed on the installation sleeve, and one end of the temperature-sensitive trigger rod passes through the T-shaped chimney. The other end of the temperature-sensitive trigger rod is located in the installation groove and acts as a limiter for the installation slide plate.

[0025] Compared with existing technologies, the advantages of this invention are:

[0026] 1. In the event of a fire, the trigger mechanism opens the first and third valves and closes the second valve, controlling the smoke exhaust fan to operate and inject high-pressure water into the water chamber. At this time, the impeller of the smoke exhaust fan rotates, creating negative pressure inside the fan casing. Smoke and fire from the building enter the T-shaped chimney through the end located inside the building, and then are discharged outwards from the exhaust fan outlet along the T-shaped chimney, flue, connecting pipes, and the smoke exhaust fan. During this process, when fire enters the flue, the high-pressure water in the water chamber is sprayed into the flue below the water chamber through the spray nozzles on the spray plate, extinguishing the fire entering the flue and cooling the passing smoke. The cooled smoke is then discharged from the exhaust fan outlet along the flue, connecting pipes, and the smoke exhaust fan.

[0027] 2. In the event of a fire, the water used for extinguishing the fire will be delivered to the inner cavity of the smoke exhaust fan's casing, connecting cylinder, T-shaped chimney, flue, and connecting pipes to cool these components. However, if the fire is large and the temperature is too high, the water temperature inside these components will increase, leading to increased pressure. At this point, the inner wall of the cavity will deform preferentially to buffer the fire. In cases where the internal pressure increases, if the temperature continues to rise, the circular weakening groove on the inner wall near the middle flow channel will be ruptured, allowing water to enter the middle flow channel. At this point, the inner cavity and the middle flow channel are connected, and the pressure in the inner cavity is released into the middle flow channel. The middle flow channel is relatively large and connects to the inside and outside of the building. The gas released into the middle flow channel will be discharged together with the water from the T-shaped flue inlet and the exhaust fan outlet, preventing the pipes from exploding due to excessive pressure.

[0028] 3. The present invention has an inner cavity inside the fan casing, connecting cylinder, T-shaped chimney, flue, and connecting pipe of the exhaust fan. Water inlet and drain outlet are installed at the upper positions of both ends of the inner cavity. The effect of arranging the water inlet and drain outlet at the upper positions of both ends of the inner cavity is to increase the time for water to enter the inner cavity. The water entering the inner cavity will only be discharged after filling the space below the drain outlet. This design can increase the water storage time in the inner cavity and improve the cooling effect on the fan casing, connecting cylinder, T-shaped chimney, flue, and connecting pipe of the exhaust fan. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the overall component appearance.

[0030] Figure 2 This is a schematic diagram of the exterior of a smoke exhaust fan.

[0031] Figure 3 This is a schematic diagram of the connecting cylinder structure.

[0032] Figure 4 This is a schematic diagram of the triggering mechanism.

[0033] Figure 5 This is a schematic diagram showing the connection between the first valve, the second valve, and the servo motor.

[0034] Figure 6 This is a schematic diagram showing the connection between the servo motor and the second valve.

[0035] Figure 7 This is a schematic diagram of the transmission of the first and second valves.

[0036] Figure 8 This is a schematic diagram of the limit rod installation.

[0037] Figure 9 This is a schematic diagram of the water collection crust distribution.

[0038] Figure 10 This is a schematic diagram of a cooling and fire extinguishing device.

[0039] Figure 11 This is a schematic diagram showing the distribution of water inlets and outlets on the pipes and casing.

[0040] Figure 12 This is a schematic diagram of the pipe and outer shell structure.

[0041] Figure 13 This is a schematic diagram of the pipe and the inner cavity of the outer shell.

[0042] Figure 14 This is a schematic diagram of the flue gas flow during normal operation of the equipment.

[0043] Figure 15 This is a schematic diagram of smoke flow during equipment fire operation.

[0044] The labels in the diagram are as follows: 1. Smoke exhaust fan; 2. Connecting cylinder; 3. T-shaped smoke stack; 4. Cooling and extinguishing device; 5. Water collection shell; 6. Connecting pipe; 7. Triggering mechanism; 8. First valve; 9. Second valve; 10. Third valve;

[0045] 1001. Fan casing; 1002. Connecting flange;

[0046] 4001, Water storage chamber; 4002, Flue; 4003, Smoke exhaust port; 4004, Spray plate; 4005, Spiral guide vane; 4006, Baffle plate; 4007, Circular drainage hole; 4008, Annular protrusion;

[0047] 5001, Water inlet;

[0048] 6001, Water inlet; 6002, Drain outlet; 6003, Intermediate flow channel; 6004, Inner cavity; 6005, Circular weakening groove;

[0049] 7001, Servo motor; 7002, First gear; 7003, Second gear; 7004, First shaft; 7005, Fixed support; 7006, Second shaft; 7007, Third shaft; 7008, Third gear; 7009, Fourth gear; 7010, Motor output shaft; 7011, Worm spring; 7012, Transmission sleeve; 7013, Mounting slot; 7014, Temperature-sensitive trigger rod; 7015, Limit rod; 7016, Fourth shaft; 7017, Slot; 7018, Trigger slope; 7019, Compression spring; 7020, Mounting slide plate; 7021, Mounting sleeve;

[0050] 8001, Valve ring; 8002, Valve disc. Detailed Implementation

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0052] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0054] like Figure 1 -like Figure 15 As shown, a fire-fighting smoke extraction system 1 for preventing fire spread, such as Figure 1 As shown, it includes a smoke exhaust fan 1, installed on the building's ventilation opening; as Figure 5 As shown, the T-shaped chimney 3 has three openings; one of these openings is located inside the building and is used to draw in gases from within the building. Figure 1 , 3 As shown, the other port is connected to the air intake of the exhaust fan 1 via the connecting tube 2; as Figure 1 , 4 As shown, a cooling and fire extinguishing device 4 is installed on the last opening; as Figure 10 As shown, the cooling and fire extinguishing device 4 includes a flue 4002 and a water storage chamber 4001 above the flue 4002, as... Figure 9 As shown, flue 4002 is connected to T-shaped chimney 3; as Figure 10 As shown, a spray plate 4004 is installed between the water storage chamber 4001 and the flue 4002, and the spray plate 4004 has spray nozzles; multiple evenly distributed baffles 4006 are fixedly installed inside the flue 4002, and the baffles 4006 have staggered circular drainage holes 4007; as shown Figure 9 , 10 As shown, a smoke exhaust port 4003 is fixedly installed at the rear of the flue 4002, and the smoke exhaust port 4003 is connected to the air intake of the smoke exhaust fan 1 through a connecting pipe 6; a water collection shell 5 is fixedly installed below the flue 4002, and the area on the lower wall of the flue 4002 that overlaps with the water collection shell 5 is perforated; a water inlet 5001 is installed at one end of the water collection shell 5; as shown Figure 11 , 12 As shown in Figure 13, the exhaust fan 1 has an inner cavity 6004 in the wall of its outer casing 1001, connecting cylinder 2, T-shaped chimney 3, flue 4002, and connecting pipe 6. Water inlet 6001 and drain outlet 6002 are installed at the upper ends of the inner cavity 6004. All water inlet 6001 are connected to the water inlet 5001 installed on the water collection shell 5 via flexible hoses. Figure 4 , 5 As shown, a second valve 9 is installed at the connection end between the T-shaped chimney 3 and the exhaust fan 1, and a first valve 8 is installed at the connection end between the T-shaped chimney 3 and the flue 4002; a third valve 10 is installed inside the connecting pipe 6; the three valves are controlled by a triggering mechanism 7 installed on the side of the T-shaped chimney 3.

[0055] like Figure 14 As shown, under normal circumstances without a fire, the first valve 8 and the third valve 10 are closed, and the second valve 9 is open. When the smoke exhaust fan 1 is working, the rotation of the impeller of the smoke exhaust fan 1 will create negative pressure in the casing of the smoke exhaust fan 1, the connecting cylinder 2, and the T-shaped chimney 3. The air in the building enters the T-shaped chimney 3 through the end of the T-shaped chimney 3 located inside the building, and then is discharged from the air outlet of the smoke exhaust fan 1 along the T-shaped chimney 3, the connecting cylinder 2, and the smoke exhaust fan 1, thus realizing the function of air circulation in the building.

[0056] like Figure 15As shown, in the event of a fire, the triggering mechanism 7 controls the opening of the first valve 8 and the third valve 10, and the closing of the second valve 9, thereby controlling the operation of the smoke exhaust fan 1 to inject high-pressure water into the water chamber. At this time, the rotation of the impeller of the smoke exhaust fan 1 will generate negative pressure inside the casing of the smoke exhaust fan 1. Smoke and fire in the building will enter the T-shaped chimney 3 through the end located inside the building, and then be discharged outward from the outlet of the smoke exhaust fan 1 along the T-shaped chimney 3, the flue 4002, the connecting pipe 6, and the smoke exhaust fan 1. During this process, when fire enters the flue 4002, the high-pressure water in the water chamber will be sprayed through the spray nozzles on the spray plate 4004 onto the flue 4002 below the water chamber. Inside the flue 4002, the fire is extinguished and the flue gas is cooled. The cooled flue gas is discharged from the exhaust fan 1 through the exhaust fan 1 along the flue 4002, the connecting pipe 6, and the exhaust fan 1. The water sprayed into the flue 4002 enters the water collection shell 5 through the dense holes on the lower wall of the flue 4002. The water in the water collection shell 5 enters the exhaust fan 1, the connecting cylinder 2, the T-shaped chimney 3, the flue 4002, and the inner cavity 6004 in the pipe wall of the connecting pipe 6 through the hose, thus cooling the exhaust fan 1, the connecting cylinder 2, the T-shaped chimney 3, the flue 4002, and the connecting pipe 6.

[0057] In this invention, a baffle plate 4006 is installed inside the flue 4002. The baffle plate 4006 has staggered circular drainage holes 4007. The purpose of installing the baffle plate 4006 and setting the staggered drainage holes is to increase the flow distance of flue gas and fire into the flue 4002, increase the time for water extinguishing, and ensure the extinguishing effect.

[0058] The present invention provides an inner cavity 6004 within the walls of the exhaust fan 1's outer casing 1001, connecting cylinder 2, T-shaped chimney 3, flue 4002, and connecting pipe 6. Water inlet 6001 and drain outlet 6002 are installed at the upper ends of the inner cavity 6004. Positioning the water inlet 6001 and drain outlet 6002 at the upper ends of the inner cavity 6004 increases the time water spends entering the inner cavity 6004. Water entering the inner cavity 6004 will only be discharged after filling the space below the drain outlet 6002. This design increases the water storage time within the inner cavity 6004, improving the cooling effect on the exhaust fan 1's outer casing 1001, connecting cylinder 2, T-shaped chimney 3, flue 4002, and connecting pipe 6.

[0059] In a further embodiment, such as Figure 2 As shown, a connecting flange 1002 is installed on the fan housing 1001 of the exhaust fan 1, and the connecting pipe 6 is connected to the exhaust fan 1 through the connecting flange 1002.

[0060] In a further embodiment, such as Figure 10 As shown, an annular protrusion 4008 is fixedly installed on the inner rear wall of the connection between the flue 4002 and the T-shaped chimney 3 in the cooling and extinguishing device 4. The cross-section of the annular protrusion 4008 is arc-shaped.

[0061] The purpose of the annular protrusion 4008 is to prevent water sprayed onto the lower wall of the flue 4002 from flowing back into the T-shaped chimney 3, affecting the amount of water entering the water collection shell 5, and consequently affecting the cooling effect on the exhaust fan 1's outer casing 1001, connecting cylinder 2, T-shaped chimney 3, flue 4002, and connecting pipe 6. In addition, the cross-section of the annular protrusion 4008 is arc-shaped, which, while preventing water from entering the T-shaped chimney 3, also ensures that the smoke enters the flue 4002 evenly and smoothly, preventing turbulence at the inlet of the flue 4002 and thus affecting the exhaust of the smoke.

[0062] In a further embodiment, such as Figure 10 As shown, spiral guide vanes 4005 are installed between the baffles 4006 installed inside the flue 4002. The function of the spiral vanes is to increase the travel distance of the flue gas and fire entering the flue 4002, increase the time for water extinguishing, and further ensure the extinguishing effect.

[0063] In a further embodiment, the upper end of the water storage chamber 4001 can be connected to a fire hydrant inside the building via a water pipe.

[0064] In a further embodiment, such as Figure 12 , 13As shown, the exhaust fan 1 has a middle flow channel 6003 in the middle of the fan housing 1001, connecting cylinder 2, T-shaped chimney 3, flue 4002 and connecting pipe 6; the inner cavity 6004 opened on the fan housing 1001, connecting cylinder 2, T-shaped chimney 3, flue 4002 and connecting pipe 6 of the exhaust fan 1 has a plurality of circular weakening grooves 6005 evenly opened on the wall surface near the middle flow channel 6003. In the event of a fire, the water used for extinguishing the fire is transported to the inner cavity 6004 of the smoke exhaust fan 1's outer casing 1001, connecting cylinder 2, T-shaped chimney 3, flue 4002, and connecting pipe 6 to cool these components. However, if the fire is large and the temperature is too high, the water temperature inside the inner cavity 6004 of the smoke exhaust fan 1's outer casing 1001, connecting cylinder 2, T-shaped chimney 3, flue 4002, and connecting pipe 6 will become too high, causing the pressure inside the inner cavity 6004 to increase. At this time, the inner wall surface of the inner cavity 6004 near the middle flow channel 6003, because it has a circular damping groove 6005, is relatively cooler than the outer wall. The inner wall surface will deform first to buffer the increase in pressure in the inner cavity 6004. If the temperature continues to rise, the circular weakening groove 6005 on the inner wall surface of the inner cavity 6004 near the middle flow channel 6003 will be squeezed and broken, and the water in the inner cavity 6004 will enter the middle flow channel 6003. At this time, the inner cavity 6004 and the middle flow channel 6003 are connected, and the pressure in the inner cavity 6004 is released into the middle flow channel 6003. The middle flow channel 6003 is relatively large and communicates with the inside and outside of the building. The gas released into the middle flow channel 6003 will be discharged together with the water from the inlet of the T-shaped flue 4002 and the exhaust outlet of the exhaust fan 1 to prevent the pipes from exploding due to excessive pressure.

[0065] In a further embodiment, such as Figure 4 , 5 As shown in Figures 7 and 8, the first valve 8 consists of two parts: a valve ring 8001 fixedly installed on the inner wall of the T-shaped chimney 3 and a valve plate 8002 oscillatingly installed within the valve ring 8001. The valve plate 8002 is oscillatingly installed on the corresponding valve ring 8001 via a fourth rotating shaft 7016. The second valve 9 consists of two parts: a valve ring 8001 fixedly installed on the inner wall of the T-shaped chimney 3 and a valve plate 8002 oscillatingly installed within the valve ring 8001. The valve plate 8002 is oscillatingly installed on the corresponding valve ring 8001 via a third rotating shaft 7007. The third valve 10 consists of two parts: a valve ring 8001 fixedly installed on the inner wall of the connecting pipe 6 and a valve plate 8002 oscillatingly installed within the valve ring 8001. The valve plate 8002 is oscillatingly installed on the corresponding valve ring 8001 via a first rotating shaft 7004.

[0066] The fourth rotating shaft 7016 swings, causing the valve plate 8002 of the first valve 8 to swing; the third rotating shaft 7007 swings, causing the valve plate 8002 of the second valve 9 to swing; the first rotating shaft 7004 swings, causing the valve plate 8002 of the third valve 10 to swing; the valve plates 8002 of the first valve 8, the second valve 9 and the third valve 10 are all equipped with positioning devices, which can ensure that the valve plate 8002 swings only ninety degrees.

[0067] In a further embodiment, such as Figure 4 , 5 As shown, a third gear 7008 is fixedly installed at one end of the third rotating shaft 7007, and a fourth gear 7009 and a first gear 7002 are fixedly installed at one end of the fourth rotating shaft 7016, with the fourth gear 7009 meshing with the third gear 7008; one end of the first rotating shaft 7004 is mounted on the cooling and extinguishing device 4 via a fixed support 7005, and a second gear 7003 is fixedly installed on the first rotating shaft 7004, meshing with the first gear 7002; the other end of the third rotating shaft 7007 is fixedly installed with a second rotating shaft 7006, and a servo motor 7001 is installed on the side of the T-shaped chimney 3; the servo motor 7001 is connected to the second rotating shaft 7006.

[0068] When the second rotating shaft 7006 is controlled to rotate, the second rotating shaft 7006 will drive the third rotating shaft 7007 to rotate, the third rotating shaft 7007 will drive the third gear 7008 to rotate, the third gear 7008 will drive the fourth gear 7009 to rotate, the fourth gear 7009 will drive the fourth rotating shaft 7016 to rotate, the fourth rotating shaft 7016 will drive the first gear 7002 to rotate, the first gear 7002 will drive the second gear 7003 to rotate, and the second gear 7003 will drive the first rotating shaft 7004 to rotate.

[0069] In a further embodiment, such as Figure 6 , 7 As shown, a transmission sleeve 7012 is fixedly installed on the output shaft of the servo motor 7001, and a worm spring 7011 is installed between the transmission sleeve 7012 and the second rotating shaft 7006.

[0070] In a further embodiment, such as Figure 6 , 7As shown in Figure 8, an installation sleeve 7021 is fixedly installed on the outer wall of the T-shaped chimney 3. An installation groove 7013 is opened in the installation sleeve 7021. An installation slide plate 7020 and a limiting rod 7015 are slidably installed in the installation groove 7013. One end of the limiting rod 7015 has a triggering inclined surface 7018. A slot 7017 is opened on the second rotating shaft 7006. The end of the limiting rod 7015 with the triggering inclined surface 7018 cooperates with the slot 7017 on the second rotating shaft 7006. A compression spring 7019 is installed between the installation slide plate 7020 and the limiting rod 7015. A temperature-sensitive trigger rod 7014 is slidably installed on the installation sleeve 7021, and one end of the temperature-sensitive trigger rod 7014 passes into the T-shaped chimney 3. The other end of the temperature-sensitive trigger rod 7014 is located in the installation groove 7013 and plays a limiting role for the installation slide plate 7020.

[0071] In this invention, the spiral spring 7011 has a preload. In the event of a fire, if the temperature is too high, the end of the temperature-sensitive trigger rod 7014 located inside the T-shaped chimney 3 will burst when its temperature reaches a certain value. After the temperature-sensitive trigger rod 7014 breaks, it loses its limiting function on the mounting slide plate 7020. At this time, under the action of the compression spring 7019, the mounting slide plate 7020 slides towards the end of the mounting groove 7013. The pressure of the compression spring 7019 is released, losing its squeezing effect on the limiting rod 7015. Then, under the action of the spiral spring 7011, the second rotating shaft 7006 will rotate. The rotation of the second rotating shaft 7006 squeezes the limiting rod 7015 through the slot 7017, causing the end of the limiting rod with the trigger inclined surface 7018 to slide out of the slot 7017, losing its limiting effect on the second rotating shaft 7015. The second rotating shaft 7006 has a limiting function. At this time, the second rotating shaft 7006 rotates under the action of the worm spring 7011. If a fire occurs but the temperature inside the T-shaped chimney 3 does not cause the temperature-sensitive trigger rod 7014 to explode or the temperature-sensitive trigger rod 7014 malfunctions, and the compression spring 7019 is not released and always applies pressure to the limiting rod 7015, the servo motor 7001 is controlled to work. The motor's work controls the output shaft to drive the transmission sleeve 7012 to rotate. The rotation of the transmission sleeve 7012 causes the worm spring 7011 to compress. When the pressure of the worm spring 7011 reaches a level that can squeeze the limiting rod 7015 through the slot 7017, the limiting rod 7015 is disengaged from the slot 7017 on the second rotating shaft 7006. At this time, the worm spring 7011 controls the rotation of the second rotating shaft 7006.

[0072] The present invention provides a double safety measure for the opening and closing of the first valve 8, the second valve 9 and the third valve 10 by setting up a servo motor 7001 and a worm spring 7011; the two can be used simultaneously.

[0073] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0074] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A smoke evacuation system for use in firefighting, characterised in that: It includes Exhaust fan, installed on the ventilation opening of the building; T-shaped chimney, T-shaped chimney is T-shaped, which has three ports; One port is placed in the building for inhaling gas in the building; Another port is connected with the suction port of the exhaust fan through the connecting cylinder; The last port is installed with cooling and fire extinguishing device; The cooling and fire extinguishing device includes flue and water storage cavity above the flue, the flue is connected with the T-shaped chimney; The water storage cavity and the flue are installed with spray plate, the spray plate is opened with spray port; The flue is fixedly installed with multiple evenly distributed baffles, the baffle is opened with staggered distributed circular drainage hole; The rear of the flue is fixedly installed with exhaust port, the exhaust port is connected with the suction port of the exhaust fan through the connecting pipeline; The lower part of the flue is fixedly installed with water collecting shell, the overlapping area of the flue lower wall and the water collecting shell is dense hole; One end of the water collecting shell is installed with water receiving port; The fan shell of the exhaust fan, the connecting cylinder, the T-shaped chimney, the flue and the connecting pipeline are opened with inner cavity, the water receiving port and the water receiving port are installed at the upper position of both ends of the inner cavity, all the water receiving ports are connected with the water receiving port of the water collecting shell through the hose; The connecting end of the T-shaped chimney and the exhaust fan is installed with the second valve, the connecting end of the T-shaped chimney and the flue is installed with the first valve; The connecting pipeline is installed with the third valve; The three valves are controlled by the trigger mechanism installed on the side of the T-shaped chimney; The first valve is composed of two parts of the valve ring fixedly installed on the inner wall of the T-shaped chimney and the valve plate swingly installed in the valve ring, the valve plate is swingly installed on the corresponding valve ring through the fourth rotating shaft; The second valve is composed of two parts of the valve ring fixedly installed on the inner wall of the T-shaped chimney and the valve plate swingly installed in the valve ring, the valve plate is swingly installed on the corresponding valve ring through the third rotating shaft; The third valve is composed of two parts of the valve ring fixedly installed on the inner wall of the connecting pipeline and the valve plate swingly installed in the valve ring, the valve plate is swingly installed on the corresponding valve ring through the first rotating shaft; One end of the third rotating shaft is fixedly installed with the third gear, one end of the fourth rotating shaft is fixedly installed with the fourth gear and the first gear, the fourth gear and the third gear are engaged; One end of the first rotating shaft is fixedly installed on the cooling and fire extinguishing device through the fixed support, the second gear is fixedly installed on the first rotating shaft, the second gear and the first gear are engaged; The other end of the third rotating shaft is fixedly installed with the second rotating shaft, the servo motor is installed on the side of the T-shaped chimney; The servo motor is connected with the second rotating shaft; The output shaft of the servo motor is fixedly installed with the transmission sleeve, the transmission sleeve and the second rotating shaft are installed with the volute spring; The outer wall of the T-shaped chimney is fixedly installed with the mounting sleeve, the mounting sleeve is opened with the mounting slot, the mounting slide plate and the limiting rod are slidably installed in the mounting slot, one end of the limiting rod has the trigger slope; The second rotating shaft is opened with the clamping groove, one end of the limiting rod with the trigger slope is matched with the clamping groove opened on the second rotating shaft; The mounting slide plate and the limiting rod are installed with the compression spring; The temperature sensing trigger rod is slidably installed on the mounting sleeve and one end of the temperature sensing trigger rod penetrates into the T-shaped chimney, the other end of the temperature sensing trigger rod is located in the mounting slot and limits the mounting slide plate.

2. A smoke extraction system for the containment of fire according to claim 1, characterised in that: The fan shell of the smoke exhaust fan is provided with a connecting flange, and a connecting pipeline is connected with the smoke exhaust fan through the connecting flange.

3. A smoke extraction system for fire fighting according to claim 1, characterized in that: An annular protrusion is fixedly installed on the rear inner wall of the connection between the flue and the T-shaped chimney, and the cross section of the annular protrusion is arc-shaped.

4. A smoke extraction system for the containment of fire according to claim 3, characterised in that: Spiral flow guide plates are installed between the partitions installed in the flue.

5. A smoke extraction system for fire fighting according to claim 1, characterized in that: The upper end of the water storage cavity is connected with a fire hydrant in a building through a water pipe.

6. A smoke extraction system for the containment of fire according to claim 1, characterized in that: The fan shell, the connecting cylinder, the T-shaped chimney, the flue and the connecting pipeline all have intermediate flow channels, and the inner cavities opened on the wall surfaces close to the intermediate flow channels are uniformly provided with a plurality of circular weakening grooves.

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