Centrifugal fan for fire fighting access

Abstract

The centrifugal fan comprises a shell, a water inlet channel and a water outlet channel are formed in the inner walls of the upper side and the lower side of the shell, an arc-shaped spraying pipe is arranged at the lower end of the water inlet channel, a first connecting cylinder is arranged in the shell, and an air cavity is formed in the first connecting cylinder; a water inlet channel is formed in the shell, a valve opening assembly is arranged in the water inlet channel, after gas in the gas cavity is heated and collides with the gas cavity, the valve opening assembly is promoted to open the water inlet channel, and high-temperature smoke passing through the cross section of the shell is cooled through the arc-shaped spraying pipe. The valve opening assembly opens the water inlet channel, so that water flows into the arc-shaped spraying pipe, the arc-shaped spraying pipe is used for cooling high-temperature smoke and smoke passing through the cross section of the shell, the smoke and smoke and high temperature are prevented from damaging the centrifugal fan, the service life of the centrifugal fan is prolonged, and stable operation of the fan in a fire disaster environment is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of fire-fighting facilities, and in particular to a centrifugal fan for a fire-fighting passage. Background Art

[0002] Fire passages are key paths for evacuation and fire rescue in emergency situations such as fires. Fire passages play an inestimable role in various dangerous situations. Centrifugal fans are usually installed in fire passages. Centrifugal fans are responsible for transporting air to ensure the freshness and comfort of indoor air. Once a fire occurs, a large amount of high-temperature smoke and fumes will quickly fill the fire passages, which will not only hinder the escape line of sight, but may also cause casualties due to the high temperature, and cause serious damage to the facilities and building structures in the passages.

[0003] The high-temperature smoke gathered in the fire passage will enter the centrifugal fan, and the rotating impeller in the centrifugal fan will drive the smoke and flue gas to be discharged from the air outlet. Since traditional centrifugal fans lack effective cooling protection measures when dealing with high-temperature smoke and flue gas, the motor is in a high-temperature environment for a long time, which can easily cause the motor and other key components inside the fan to be damaged due to high temperature, making it impossible to quickly discharge the high-temperature smoke and flue gas in the fire passage, shortening the service life of the motor, and even causing a short circuit failure, causing the fan to fail to operate normally. Summary of the invention

[0004] The object of the present invention is to provide a centrifugal fan for a fire passage to solve the problems raised in the above background technology.

[0005] Technical Solution The present invention provides the following technical solution: A centrifugal fan for a fire channel, comprising a shell, a water inlet channel and a water outlet channel are opened in the inner walls of the upper and lower sides of the shell, an arc-shaped spray pipe is arranged at the lower end of the water inlet channel, a first connecting tube is arranged in the shell, an air cavity is arranged in the first connecting tube, a valve opening component is arranged in the water inlet channel, the gas in the air cavity is heated and collided, which prompts the valve opening component to open the water inlet channel, and the high-temperature smoke and flue gas passing through the cross section of the shell is cooled by the arc-shaped spray pipe, and the spray water is discharged through the water outlet channel; The valve opening assembly includes a push rod, which opens the water inlet channel when it moves, and water flows into the arc-shaped spray pipe.

[0006] Preferably, the air cavity is filled with nitrogen, a push column is movably installed in the air cavity, a protective frame and a fixed frame are arranged inside the shell, a connecting rod is arranged on the outside of the first connecting tube, and the air cavity is connected with the fixed frame through the connecting rod.

[0007] Preferably, a tooth column, a first rotating gear, a sliding block and an inclined pushing block are arranged in the fixed frame. A knocking rod is arranged between the two first rotating gears, and the sliding block is in sliding contact with the inclined pushing block.

[0008] Preferably, a cleaning rod is arranged at the end of the first connecting cylinder. The cleaning rod rotates to clean both sides of the protection frame. When the cleaning rod rotates, the knocking rod is driven by the tooth column and the first rotating gear to knock on the protection frame.

[0009] Preferably, the side of the inclined pushing block is fixedly connected to a pushing rod, and the pushing rod is movably connected to a pushing column.

[0010] Preferably, an energy-saving water pump is arranged on the water inlet channel. A lead screw, a second rotating gear and a second blocking plate are arranged in the water inlet channel. A blocking plate is arranged outside the lead screw. Both the blocking plate and the second blocking plate are located inside the water inlet channel. The pushing rod drives the second blocking plate to open the water outlet end of the water inlet channel through the second rotating gear.

[0011] Preferably, a piston chamber is formed inside the housing. A first piston plate and a second piston plate are arranged in the piston chamber. A first blocking plate is fixedly installed on the side of the second piston plate, and the first blocking plate is located in the water outlet channel.

[0012] Preferably, a motor is arranged inside the housing. A rotating cylinder is arranged at the output shaft end of the motor. The rotating cylinder is movably connected to the pushing column, and a fan blade is arranged outside the rotating cylinder.

[0013] Preferably, a first bevel gear, a second bevel gear, a third bevel gear and a movable rod are respectively arranged inside the rotating cylinder. A second connecting cylinder is fixedly installed at the end of the first bevel gear, and a tension spring is arranged on one side of the movable rod.

[0014] Preferably, a pushing block is arranged at the end of the movable rod, and the pushing block extends into the second connecting cylinder. An arc-shaped protrusion is arranged in the second connecting cylinder, and an arc-shaped groove matching the arc-shaped protrusion is formed on the pushing block.

[0015] Advantageous Effects Compared with the prior art, the present invention provides a centrifugal fan for a fire passage, having the following advantageous effects: 1. In the present invention, the valve opening assembly is triggered to work by the heat expansion of the air chamber. The valve opening assembly opens the water inlet channel, allowing water to flow into the arc-shaped spray pipe. The arc-shaped spray pipe is used to cool the high-temperature smoke passing through the cross-section of the housing, avoiding damage to the centrifugal fan caused by the smoke and high temperature, extending the service life of the centrifugal fan, and ensuring the stable operation of the fan in a fire environment.

[0016] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not intended to limit the present disclosure.

[0017] This application document provides an overview of various implementations or examples of the technology described in this disclosure, and is not a full disclosure of the entire scope or all features of the disclosed technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments recorded in the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0019] Figure 1 Front view of the overall structure of the present invention; Figure 2 Cross-sectional view of the housing of the present invention, perspective one; Figure 3 Cross-sectional view of the housing of the present invention, perspective two; Figure 4 Cross-sectional view of the first connecting cylinder of the present invention; Figure 5 Internal view of the fixing frame of the present invention; Figure 6 Connection diagram of the water inlet channel and the fixing frame of the present invention; Figure 7 Schematic diagram of the water inlet channel in the open working state of the present invention; Figure 8 Schematic diagram of the water outlet channel of the present invention; Figure 9 Connection diagram of the push rod and the rotating cylinder of the present invention; Figure 10 Schematic diagram of the push rod entering the rotating cylinder to adjust the angle of the fan blade of the present invention; Figure 11 Internal cross-sectional view of the push rod entering the second connecting cylinder of the present invention.

[0020] Explanation of reference numerals in the drawings: In the figure: 1, housing; 2, water inlet channel; 3, water outlet channel; 4, energy-saving water pump; 5, protective frame; 6, cleaning rod; 7, arc-shaped spray pipe; 8, motor; 9, rotating cylinder; 10, fan blade; 11, fixed frame; 12, first connecting cylinder; 13, first plugging plate; 14, air cavity; 15, push column; 16, connecting rod; 17, tooth column; 18, first rotating gear; 19, knocking rod; 20, sliding block; 21, inclined push block; 22, push rod; 23, lead screw; 24, second rotating gear; 25, second plugging plate; 26, piston cavity; 27, first piston plate; 28, second piston plate; 29, first bevel gear; 30, second bevel gear; 31, third bevel gear; 32, second connecting cylinder; 33, movable rod; 34, tension spring; 35, push block; 36, arc-shaped groove. Detailed implementation manner

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] Embodiment: Please refer to Figures 1-11 , the present invention provides a technical solution: a centrifugal fan for a fire passage, including a housing 1, a water inlet channel 2 fixedly installed in the inner walls on the upper and lower sides of the housing 1, and a water outlet channel 3 opened, an arc-shaped spray pipe 7 fixedly installed at the lower end of the water inlet channel 2, a first connecting cylinder 12 arranged in the housing 1, an air cavity 14 opened in the first connecting cylinder 12, a valve opening assembly arranged in the water inlet channel 2, and the gas in the air cavity 14 will promote the valve opening assembly to open the water inlet channel 2 after being heated and collided, and the high-temperature smoke and flue gas passing through the cross-section of the housing 1 are cooled through the arc-shaped spray pipe 7, and the sprayed water is discharged through the water outlet channel 3; The valve opening assembly includes a push rod 22, and when the push rod 22 moves, it will open the water inlet channel 2, and water will enter the arc-shaped spray pipe 7.

[0023] In this embodiment, nitrogen is filled in the air cavity 14, a push column 15 is movably installed in the air cavity 14, a protective frame 5 is clamped inside the housing 1, and a fixed frame 11 is fixedly installed, a connecting rod 16 is movably installed outside the first connecting cylinder 12, and the air cavity 14 is communicated with the fixed frame 11 through the connecting rod 16.

[0024] One end of the connecting rod 16 is fixedly connected to the fixed frame 11, and the connecting rod 16 is in communication with the fixed frame 11. The other end of the connecting rod 16 is sleeved outside the first connecting cylinder 12. A connecting channel is provided between the first connecting cylinder 12 and the connecting rod 16, and an air valve is installed in the connecting channel. When the nitrogen gas in the air chamber 14 expands due to heat, it will enter the fixed frame 11 through the air valve and the connecting rod 16.

[0025] In this embodiment, a tooth column 17, a first rotating gear 18, a sliding block 20, and an inclined pushing block 21 are movably installed in the fixed frame 11. The tooth column 17 is meshed with the first rotating gear 18. The upper part of the sliding block 20 is in sliding contact with the inclined pushing block 21 through an inclined side. The tooth column 17 and the first rotating gear 18, and the sliding block 20 and the inclined pushing block 21 are respectively located in two chambers of the fixed frame 11, and the two chambers are not in communication. A knocking rod 19 is fixedly installed between the two first rotating gears 18. A knocking hole is penetrated through the inner wall of the fixed frame 11 close to the protective frame 5. The knocking rod 19 is in contact with the outside of the protective frame 5. When the knocking rod 19 rotates, it will knock on the protective frame 5, and the knocking can make the dust in the holes of the protective frame 5 fall off, prevent the protective frame 5 from being blocked, and ensure that the centrifugal fan can quickly draw away the flue gas and ventilate during operation.

[0026] In this embodiment, a cleaning rod 6 is connected to the end of the first connecting cylinder 12 by bolts. The cleaning rod 6 can be quickly detached from the first connecting cylinder 12 by bolts. The cleaning rod 6 rotates to clean both sides of the protective frame 5. The end of the cleaning rod 6 is in sliding connection with the bottom end of the tooth column 17. A compression spring is arranged between the tooth column 17 and the fixed frame 11. When the cleaning rod 6 contacts the tooth column 17, it will compress the compression spring. When the cleaning rod 6 separates from the tooth column 17, the tooth column 17 will return to its original position under the action of the compression spring. When the cleaning rod 6 rotates, it drives the knocking rod 19 to knock on the protective frame 5 through the tooth column 17 and the first rotating gear 18.

[0027] In this embodiment, the push rod 22 penetrates through the side wall of the fixed frame 11 and is fixedly installed with the push rod 22. The lowest end of the sliding through hole is higher than the position where the sliding block 20 is lifted, to prevent the gas from the air chamber 14 from leaking through the sliding through hole. The other end of the push rod 22 is sleeved outside the push column 15. When the push column 15 moves, the push rod 22 will move together, and the push rod 22 will not change its position on the push column 15.

[0028] In this embodiment, an energy-saving water pump 4 is installed on the water inlet channel 2. A lead screw 23 is movably installed in the water inlet channel 2. A plug plate is threadedly connected to the outside of the lead screw 23. A second rotating gear 24 is fixedly installed on the part of the lead screw 23 located outside the water inlet channel 2. A second blocking plate 25 is movably installed inside the water inlet channel 2. Both the plug plate and the second blocking plate 25 are located inside the water inlet channel 2. The push rod 22 drives the second blocking plate 25 to open the water outlet end of the water inlet channel 2 through the second rotating gear 24.

[0029] Both the adjacent sides of the push rod 22 and the second blocking plate 25 have gear parts matching the second rotating gear 24. When the push rod 22 moves, it will drive the second blocking plate 25 to come out of the water inlet channel 2 through the second rotating gear 24. After the second blocking plate 25 moves, the water in the water inlet channel 2 will enter the arc-shaped spray pipe 7 and the cooling water pipe. The water entering the arc-shaped spray pipe 7 will cool the flue gas passing through the cross-section of the housing 1, while the water entering the cooling water pipe will cool the motor 8, ensuring that the working time of the motor 8 is prolonged when the centrifugal fan extracts the temperature-sensitive flue gas and preventing the motor 8 from being damaged.

[0030] The energy-saving water pump 4 will control the water volume in the water inlet channel 2, save water, and at the same time prevent damage to the housing 1 caused by water flow impact.

[0031] There are two fixing frames 11, which are symmetrically distributed inside the housing 1. One is located on the side of the water inlet channel 2, and the other is located on the side of the water outlet channel 3. A knocking rod 19 is also provided in the fixing frame 11 close to the water outlet channel 3 side, but the sliding block 20 and the inclined push block 21 are not provided. At the same time, when the nitrogen gas in the air chamber 14 expands after being heated, the gas will still enter this fixing frame 11 and enter the piston chamber 26 to push the first piston plate 27.

[0032] The surface of the water outlet channel 3 is coated with waterproof material to prevent the housing 1 from being corroded.

[0033] In this embodiment, a piston chamber 26 is opened inside the housing 1. A first piston plate 27 and a second piston plate 28 are movably installed in the piston chamber 26. A return spring is provided at the bottom end of the first piston plate 27. A first blocking plate 13 is fixedly installed on the side of the second piston plate 28. A protective plate is fixedly installed on the second piston plate 28. The protective plate can prevent the gas in the piston chamber 26 from entering the water outlet channel 3 and prevent the water passing through the water outlet channel 3 from entering the piston chamber 26. The first blocking plate 13 is located in the water outlet channel 3. When the water inlet channel 2 is not opened, the first blocking plate 13 will block the water outlet channel 3. When the water inlet channel 2 is opened and the arc-shaped spray pipe 7 is working, the first blocking plate 13 will move upward synchronously to open the water outlet channel 3, so that the water sprayed by the arc-shaped spray pipe 7 and the water passing through the cooling pipe will be discharged through the water outlet channel.

[0034] After the water inlet channel 2 is opened, the water flow not only cools the flue gas through the arc-shaped spray pipe 7, but also diverts a part of the water into the cooling water pipe wound around the outside of the motor 8. The water in the cooling water pipe can timely take away the heat generated by the motor during operation and due to the high ambient temperature, accelerating the heat dissipation speed of the motor 8. This ensures that the working time of the motor is extended during the extraction of high-temperature smoke, prevents the motor from being damaged due to overheating, improves the reliability and service life of the motor, and thus ensures the stable operation of the centrifugal fan as a whole.

[0035] After the push column 15 is connected to the rotating cylinder 9, the rotation of the motor 8 not only drives the fan blade 10 to rotate, but also drives the first connecting cylinder 12 to rotate together, so that the cleaning rod 6 installed on the side of the first connecting cylinder 12 rotates. During the rotation of the cleaning rod 6, it physically removes the dust or debris on the protective frame 5, preventing excessive accumulation of dust or debris on the protective frame 5. This not only ensures the smoothness of the centrifugal fan in extracting smoke and flue gas, avoids the reduction of the air extraction efficiency caused by blockage, but also prevents the dust or debris on the protective frame 5 from being ignited by the high-temperature smoke and flue gas, causing a fire and damaging the centrifugal fan.

[0036] When the cleaning rod 6 rotates, its end contacts the tooth column 17 and drives the tooth column 17 to move in the fixed frame 11. When the tooth column 17 moves, it drives the knocking rod 19 to intermittently knock on the protective frame 5 through the engagement with the first rotating gear 18. This knocking effect can promote the rapid falling of the dust tightly attached to the protective frame 5, further prevent the protective frame 5 from being blocked by dust, and ensure that the ventilation and air extraction performance of the centrifugal fan is always in good condition.

[0037] The energy-saving water pump 4 installed on the water inlet channel 2 can accurately control the water volume in the water inlet channel. According to actual needs, on the premise of ensuring effective cooling of the high-temperature flue gas and the motor, it avoids the waste of water resources and achieves the purpose of saving water. At the same time, reasonably controlling the water volume can also prevent structural damage to the housing 1 caused by excessive water flow impact, protect the outer shell of the centrifugal fan, and extend the overall service life of the equipment.

[0038] Please refer to Figures 9-11 , the present invention provides a technical solution: In this embodiment, a motor 8 is fixedly installed in the inner cavity of the housing 1, a protective shell is installed outside the motor 8, a rotating cylinder 9 is fixedly installed at the output shaft end of the motor 8, the rotating cylinder 9 is movably connected to the push column 15, the push column 15 will move towards the rotating cylinder 9 side under the expansion extrusion of nitrogen in the air cavity 14, and a plugging column is fixedly installed on the side of the push column 15 close to the rotating cylinder 9. The plugging column enters the rotating cylinder 9 and is clamped with the push block 35, and a fan blade 10 is movably installed outside the rotating cylinder 9.

[0039] A cooling water pipe is wound around the outside of the motor 8. One end of the cooling water pipe is connected to the water inlet passage 2, and the other end is connected to the water outlet passage 3. When the valve of the water inlet passage 2 is opened to spray the inside of the housing 1, a part of the water will cool the motor 8 through the cooling water pipe and flow out through the water outlet passage 3.

[0040] In this embodiment, a first bevel gear 29, a second bevel gear 30, a third bevel gear 31 and a movable rod 33 are respectively movably installed inside the rotating cylinder 9. The first bevel gear 29 and the second bevel gear 30 are meshed and connected. The second bevel gear 30 and the third bevel gear 31 are meshed and connected. The other end of the third bevel gear 31 is fixedly connected to the fan blade 10. When the first bevel gear 29 rotates, the fan blade 10 can be driven to rotate through the second bevel gear 30 and the third bevel gear 31, so as to adjust the inclination angle between the fan blade 10 and the rotating cylinder 9. When the inclination angle of the fan blade 10 increases within a certain range, the fan blade 10 can push more air during the rotation process, increasing the flow velocity of the air in the axial direction, thereby increasing the air extraction flow rate and the air extraction efficiency. When the fan blade 10 does not need to change the angle, the centrifugal fan mainly undertakes the ventilation effect in the fire passage, but when there is a fire or other dangerous situations and smoke is generated, the inclination angle of the fan blade 10 will change, and the fan blade 10 increases the extraction efficiency of the smoke.

[0041] A second connecting cylinder 32 is fixedly installed at the end of the first bevel gear 29. The second connecting cylinder 32 will drive the first bevel gear 29 to rotate simultaneously during movement. A tension spring 34 is fixedly installed on one side of the movable rod 33. The other end of the tension spring 34 is fixedly connected to the inner wall of the rotating cylinder 9. The movable rod 33 is fixedly connected to the pushing block 35.

[0042] When the pushing column 15 does not enter the rotating cylinder 9, the tension spring 34 is not stretched, and the movable rod 33 moves in a straight line inside the rotating cylinder 9.

[0043] In this embodiment, the pushing blocks 35 are fixedly installed on the same side of the plurality of movable rods 33, and the pushing blocks 35 extend into the second connecting cylinder 32. A connecting cavity is provided in the second connecting cylinder 32. Arc-shaped protrusions are fixedly installed at equal intervals on the inner wall of the connecting cavity of the second connecting cylinder 32. Arc-shaped grooves 36 matching the arc-shaped protrusions are provided on the pushing blocks 35. When the pushing column 15 enters the rotating cylinder 9, it will drive the pushing blocks 35 to enter the second connecting cylinder 32. Due to the cooperation of the pushing column 15 with the movable rod 33, the pushing column 15 moves in a straight line. In this way, when the pushing block 35 moves, through the cooperation of the arc-shaped protrusions and the arc-shaped grooves 36, the second connecting cylinder 32 will rotate, thereby driving the first bevel gear 29 to rotate, and thus changing the inclination angle of the fan blade 10.

[0044] When the nitrogen gas in the air chamber 14 expands and pushes the push column 15 to move towards the rotating cylinder 9 and enters the rotating cylinder 9 to engage with the push block 35. Driven by the push column 15, the push block 35 enters the second connecting cylinder 32. Through the cooperation between the arc-shaped protrusion on the inner wall of the connecting chamber of the second connecting cylinder 32 and the arc-shaped groove 36 on the push block 35, the second connecting cylinder 32 rotates, and then drives the first bevel gear 29 to rotate. When the first bevel gear 29 rotates, it drives the fan blade 10 to rotate through the meshing with the second bevel gear 30 and the third bevel gear 31 in sequence, realizing the adjustment of the inclination angle between the fan blade 10 and the rotating cylinder 9.

[0045] When the inclination angle of the fan blade 10 increases within a certain range, according to the aerodynamic principle, at the same motor speed, the tangential component force of the fan blade 10 on the air increases, enabling the air to obtain a greater speed, thereby increasing the air extraction speed. At the same time, the fan blade 10 can push more air during rotation, increasing the air flow speed in the axial direction and improving the air extraction flow rate. This design enables the centrifugal fan to maintain a conventional angle of the fan blade 10 during normal ventilation tasks; while in the event of a fire or other dangerous situations with smoke, the inclination angle of the fan blade 10 automatically changes, significantly increasing the extraction efficiency of the smoke, accelerating the dissipation of the smoke and flue gas inside the fire escape, and providing a better environment for personnel evacuation and fire rescue.

[0046] The working principle of this embodiment: When the centrifugal fan in the fire escape is working and the temperature of the smoke entering the housing 1 rises, the nitrogen gas in the air chamber 14 will expand when heated, causing the push column 15 to move towards the rotating cylinder 9. At the same time, it will also enter the fixed frame 11 through the connecting channel and the connecting rod 16. The gas entering the fixed frame 11 will push the sliding block 20 to move and drive the inclined push block 21 to move. The inclined push block 21 moves horizontally in the fixed frame 11, and then drives the push rod 22 to move horizontally. When the push rod 22 moves, it will drive the lead screw 23 to move through the second rotating gear 24 and drive the second blocking plate 25 to move in the water inlet channel 2. Moreover, when the lead screw 23 moves, it will drive the blocking plate to move upward, and cooperate with the second blocking plate 25 to open the water inlet channel 2. Water is input into the water inlet channel 2 through the energy-saving water pump 4. The water in the water inlet channel 2 will enter the arc-shaped spray pipe 7 to dissipate heat from the smoke and flue gas entering the housing 1, avoiding damage to the centrifugal fan body caused by excessive temperature of the smoke and flue gas. At the same time, the water flow in the water inlet channel 2 will synchronously cool the motor 8 through the cooling water pipe, accelerating the heat dissipation of the motor 8.

[0047] The gas that enters the fixed frame 11 near one side of the water outlet channel 3 will push the first piston plate 27 in the piston chamber 26, and then push the second piston plate 28 to move upward in the piston chamber 26. When the second piston plate 28 moves upward, it will drive the first blocking plate 13 to move upward, thereby opening the water outlet channel 3, facilitating the water sprayed by the arc-shaped spray pipe 7 and the water for cooling the motor 8 to flow out through the water outlet channel 3; usually, under the action of the return spring, the first blocking plate 13 will block the water outlet channel to prevent water from flowing back.

[0048] After the nitrogen gas in the air chamber 14 expands, it pushes the column 15 to move, and with the cooperation of the push rod 22, it will enter the rotating cylinder 9, and will drive the push block 35 into the second connecting cylinder 32. Through the cooperation of the arc-shaped protrusion and the arc-shaped groove 36, when the push block 35 moves, it will drive the second connecting cylinder 32 to rotate. In this way, when the second connecting cylinder 32 rotates, it will drive the first bevel gear 29 to rotate simultaneously. When the first bevel gear 29 rotates, it will drive the third bevel gear 31 to rotate together through the second bevel gear 30. In this way, when the third bevel gear 31 rotates, it will drive the inclination angle of the fan blade 10 to become larger. When the inclination angle of the fan blade 10 becomes larger within a certain range, the fan blade 10 can push more air during the rotation process, increasing the axial flow velocity of the air, thereby increasing the exhaust air flow rate. When the inclination angle of the fan blade 10 increases, at the same motor speed, the tangential component force of the fan blade 10 on the air increases, causing the air to obtain a greater speed, thereby increasing the exhaust air speed, achieving an increase in the extraction speed of the smoke and flue gas of plastics, and accelerating the dissipation of the smoke and flue gas inside the fire passage.

[0049] When the push column 15 is connected to the rotating cylinder 9, when the motor 8 rotates, it will also drive the first connecting cylinder 12 to rotate together. In this way, the cleaning rod 6 located on the side of the first connecting cylinder 12 will also rotate, and clean the dust or debris on the protective frame 5, first ensuring the smoothness of the centrifugal fan extracting the smoke and flue gas, and preventing the dust or debris on the protective frame 5 from being ignited by the high-temperature smoke and flue gas, resulting in damage to the centrifugal fan.

[0050] At the same time, when the cleaning rod 6 rotates, the cleaning rod 6 will contact the tooth column 17 and drive the tooth column 17 to move in the fixed frame 11. When the tooth column 17 moves, it will drive the knocking rod 19 to intermittently knock on the protective frame 5 through the first rotating gear 18, promoting the rapid fall of the dust on the protective frame 5 and preventing the protective frame 5 from being blocked by dust.

[0051] Only some exemplary embodiments of the present invention have been described by way of illustration. Undoubtedly, for those of ordinary skill in the art, without departing from the spirit and scope of the present invention, the described embodiments can be modified in various different ways. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A centrifugal fan for a fire passage, comprising a housing, characterized in that: A water inlet channel and a water outlet channel are provided in the inner walls on the upper and lower sides of the shell, an arc-shaped spray pipe is provided at the lower end of the water inlet channel, a first connecting tube is provided in the shell, an air cavity is provided in the first connecting tube, a valve opening component is provided in the water inlet channel, and the gas in the air cavity will cause the valve opening component to open the water inlet channel after being heated and collided, and the high-temperature smoke and flue gas passing through the cross section of the shell is cooled by the arc-shaped spray pipe, and the spray water is discharged through the water outlet channel; The valve opening assembly includes a push rod, which opens the water inlet channel when it moves, and water flows into the arc-shaped spray pipe.

2. A centrifugal fan for fire passage according to claim 1, characterized in that: The air cavity is filled with nitrogen, a push column is movably installed in the air cavity, a protection frame and a fixing frame are arranged inside the shell, a connecting rod is arranged outside the first connecting tube, and the air cavity is connected with the fixing frame through the connecting rod.

3. A centrifugal fan for fire passage according to claim 2, characterized in that: The fixed frame is provided with a gear column, a first rotating gear, a sliding block and an oblique push block, a knocking rod is provided between the two first rotating gears, and the sliding block is in sliding contact with the oblique push block.

4. A centrifugal fan for fire passage according to claim 3, characterized in that: A cleaning rod is provided at the end of the first connecting tube. The cleaning rod rotates to clean both sides of the protection frame. When the cleaning rod rotates, the knocking rod is driven by the gear column and the first rotating gear to knock the protection frame.

5. A centrifugal fan for fire passage according to claim 3, characterized in that: The side edge of the oblique push block is fixedly connected to the push rod, and the push rod is movably connected to the push column.

6. A centrifugal fan for fire passage according to claim 5, characterized in that: An energy-saving water pump is arranged on the water inlet channel, and a screw, a second rotating gear and a second blocking plate are arranged in the water inlet channel. A blocking plate is arranged on the outside of the screw, and the blocking plate and the second blocking plate are both located inside the water inlet channel. The push rod drives the second blocking plate to open the water outlet end of the water inlet channel through the second rotating gear.

7. A centrifugal fan for fire passage according to claim 2, characterized in that: A piston cavity is provided inside the shell, a first piston plate and a second piston plate are arranged in the piston cavity, a first blocking plate is fixedly installed on the side of the second piston plate, and the first blocking plate is located in the water outlet channel.

8. A centrifugal fan for fire passage according to claim 1, characterized in that: A motor is arranged inside the shell, a rotating cylinder is arranged at the output shaft end of the motor, the rotating cylinder is movably connected to the pushing column, and fan blades are arranged on the outside of the rotating cylinder.

9. A centrifugal fan for fire passage according to claim 8, characterized in that: The first bevel gear, the second bevel gear, the third bevel gear and the movable rod are respectively arranged inside the rotating cylinder, the second connecting cylinder is fixedly installed on the end of the first bevel gear, and a tension spring is arranged on one side of the movable rod.

10. A centrifugal fan for fire passage according to claim 9, characterized in that: A push block is arranged at the end of the movable rod, and the push block extends into the second connecting tube. An arc-shaped protrusion is arranged in the second connecting tube, and an arc-shaped groove matching the arc-shaped protrusion is arranged on the push block.

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