Fire smoke exhaust equipment for discharging smoke gas inside construction shaft

Abstract

The present application relates to the technical field of fire smoke exhaust equipment, in particular to a construction shaft internal smoke exhaust fire smoke exhaust equipment, which comprises a fan cylinder and a rack fixed to the rear side of the center of the fan cylinder, a power motor is fixed to the top end of the rack, the motor shaft center of the power motor is longitudinally coincident with the center of the fan cylinder, a vane disc is fixed to the front end of the motor shaft of the power motor through a fixing disc and screws, a plurality of smoke exhaust vanes are equidistantly arranged on the circular outer wall of the vane disc, and the smoke exhaust vanes are located at the front side of the center of the fan cylinder, the near front end top of the fan cylinder and the inside thereof are provided with an interference-free vane cleaning device, when the surface of the smoke exhaust vane is covered with smoke dust, the power motor can be stopped first, then two groups of metal integrated strips are synchronously driven to approach by a driving motor, so that the lengthened soft bristles are fully attached to the front and back surfaces of the smoke exhaust vane, then the power motor is started at low speed to drive the smoke exhaust vane to rotate slowly, so that the overall cleaning is completed, which is beneficial to restore the smoke exhaust efficiency and reduce the difficulty of manual disassembly and maintenance.

Description

Technical Field

[0001] This invention relates to the field of fire-fighting smoke exhaust equipment technology, and more specifically, to a fire-fighting smoke exhaust equipment for exhausting smoke from inside a construction shaft. Background Technology

[0002] Construction shafts are common vertical working spaces in underground engineering, subway engineering, integrated pipe gallery, tunnel engineering and deep foundation pit construction. Due to their narrow and long internal space and poor air circulation, they are prone to accumulating welding fumes, mechanical exhaust fumes, dust and a large amount of high-temperature fumes generated by fire accidents during construction. Therefore, fire exhaust equipment is usually required to promptly discharge the fumes inside the shaft, improve the safety of the construction environment, and create favorable conditions for personnel evacuation and fire rescue. Currently, the fire-fighting smoke exhaust equipment used in construction shafts typically employs fans in conjunction with smoke exhaust fan blades to continuously extract smoke. During long-term operation, impurities such as dust, oil, and carbon particles in the smoke can easily adhere to the surface of the smoke exhaust fan blades. As the amount of adhesion increases, it not only alters the aerodynamic characteristics of the smoke exhaust fan blades but also increases wind resistance, leading to a gradual decrease in smoke exhaust efficiency. In severe cases, it can also cause increased fan vibration, increased energy consumption, and reduced equipment operational stability. In existing technologies, when cleaning the exhaust fan blades, it is often necessary to disassemble the fan's protective components or even the fan itself before manual cleaning. This not only involves a large amount of maintenance work but also results in long downtime. Although some equipment is equipped with a cleaning mechanism, the cleaning mechanism is located near the fan blades for a long time, which can easily interfere with normal smoke exhaust and even pose a risk of interference with the high-speed rotating fan blades. Therefore, it is difficult to meet both normal smoke exhaust and subsequent maintenance needs. In view of this, we propose a fire smoke exhaust device for exhausting smoke inside construction shafts. Summary of the Invention

[0003] The purpose of this invention is to provide a fire smoke exhaust device for exhausting smoke inside construction shafts, in order to solve the problems mentioned in the background art, such as the accumulation of smoke and dust on the exhaust fan blades after long-term operation, the inconvenience of manual cleaning and maintenance, the impact of dust accumulation on the exhaust fan blades without cleaning, and the high maintenance cost.

[0004] To achieve the above objectives, the present invention provides a fire-fighting smoke exhaust device for exhausting smoke inside a construction shaft, including a fan casing and a frame fixed inside its central rear side. A power motor is fixed at the top of the frame, and the center of the motor shaft of the power motor is longitudinally aligned with the center of the fan casing. An impeller is fixed to the front end of the motor shaft of the power motor by a fixing plate and screws. Multiple smoke exhaust blades are equidistantly arranged on the circular outer wall of the impeller, and the smoke exhaust blades are located on the front side of the center inside the fan casing. An interference-free blade cleaning device is provided near the front top and inside the fan casing. The interference-free blade cleaning device includes a fixing plate, a U-shaped thickened metal frame, a thickened strip-shaped drive block A, and a thickened... The fan casing consists of a strip-shaped drive block B, movable guide holes, and movable guide rods. A U-shaped thickened metal frame with its U-shaped opening facing downwards is positioned near the top of the front end of the fan casing. Both ends of the U-shaped thickened metal frame opening are equipped with fixing plates, and both fixing plates are fixed to the outer wall of the top of the fan casing with multiple screws. Thickened strip-shaped drive blocks A and B are respectively located on the front and rear sides of the center of the U-shaped thickened metal frame. Movable guide holes are opened on the upper and lower sides of the center of thickened strip-shaped drive blocks A and B, and movable guide rods are inserted into both sets of movable guide holes. The front and rear ends of the two movable guide rods are respectively fixed to the inner walls of the front and rear ends of the U-shaped thickened metal frame.

[0005] As a preferred embodiment of the present invention, the interference-free fan blade cleaning device further includes a metal integrated strip, extended soft bristles, and an integrated strip movable slot. The integrated strip movable slot is provided below the opening of the U-shaped thickened metal frame, and the integrated strip movable slot is longitudinally opened inside the top of the fan cylinder. The bottom ends of the thickened strip-shaped drive block A and the thickened strip-shaped drive block B are both vertically welded with metal integrated strips. Both metal integrated strips pass through the integrated strip movable slot and extend downward into the fan cylinder. The two metal integrated strips are located in front of and behind the exhaust fan blades, respectively. The side of the two metal integrated strips facing downward towards the exhaust fan blades is densely covered with extended soft bristles.

[0006] As a preferred embodiment of the present invention, both the thickened strip-shaped drive block A and the thickened strip-shaped drive block B can slide back and forth outside the movable guide rod through the movable guide hole inside the U-shaped thickened metal frame. The two movable guide rods can prevent the thickened strip-shaped drive block A and the thickened strip-shaped drive block B from rotating or shifting during the back and forth sliding process. When the thickened strip-shaped drive block A and the thickened strip-shaped drive block B approach the inner walls of the front and rear ends of the U-shaped thickened metal frame, the elongated soft bristles densely distributed on the metal integrated strip do not come into contact with the exhaust fan blades.

[0007] As a preferred embodiment of the present invention, the interference-free fan blade cleaning device further includes a bearing seat, a drive motor, a drive screw hole, and a drive screw. Both the thickened strip-shaped drive block A and the thickened strip-shaped drive block B have drive screw holes in their centers. Drive screws are threaded into the two drive screw holes. Bearing seats are provided on the outer walls of both the front and rear ends of the U-shaped thickened metal frame. The drive motor is fixed to the bearing seat on the rear side by a flange and screws. The drive motor is electrically connected to an external control power supply through wires.

[0008] As a preferred embodiment of the present invention, the two ends of the drive screw are respectively inserted into the bearings inside the two bearing seats, and the rear end of the drive screw is fixedly connected to the motor shaft of the drive motor. The drive screw holes inside the thickened strip-shaped drive block A and the thickened strip-shaped drive block B have opposite thread directions. The bottom ends of the two metal integrated strips are close to the impeller, but do not contact the circular outer wall of the impeller.

[0009] As a preferred embodiment of the present invention, during the clockwise rotation of the drive screw driven by the drive motor, the drive screw drives the thickened strip-shaped drive block A to move forward and the thickened strip-shaped drive block B to move backward through two drive screw holes with opposite thread directions, so that both metal integrated strips move closer to the exhaust fan blades until the two sets of extended soft bristles fully contact the front and rear end outer walls of the exhaust fan blades, while the exhaust fan blades do not contact the two metal integrated strips when rotating.

[0010] As a preferred embodiment of the present invention, an electrical control box is fixed to the outer wall of the left side of the fan casing by screws. The electrical control box is electrically connected to an external control power supply, and the power motor is electrically connected to the electrical control box by wires. Fixed flanges are welded to the outside of the openings at both ends of the fan casing. The fan casing is connected and fixed to the connecting air duct through the fixed flange at the front end, and the fixed flange at the rear end can be fixed with screws to secure the protective net.

[0011] As a preferred embodiment of the present invention, a set of support plates is welded to the arc-shaped outer wall at the front and rear ends of the center of the fan casing. Both sets of support plates extend vertically downwards, and a mounting base is welded to the bottom of both sets of support plates. The mounting base is fixed at the usage position by multiple screws.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention adds a novel interference-free fan blade cleaning device to the top and inside of the fan casing. When not in use, this device does not interfere with the normal operation of the entire smoke exhaust system. When the thickened strip-shaped drive block A and thickened strip-shaped drive block B are positioned at the front and rear ends of the U-shaped thickened metal frame, the elongated soft bristles on both sets of integrated metal strips maintain a distance from the smoke exhaust fan blades, preventing contact and avoiding impact on the fan's normal smoke exhaust and duct flow area. When the smoke exhaust fan blades are exposed to the smoke environment of the construction shaft for extended periods, their surfaces accumulate significant amounts of smoke dust and particulate matter. When dust or oil stains cause a decrease in smoke extraction efficiency, the power motor can be stopped first, and then the drive motor can be started to drive the drive screw to rotate. The drive screw is used to cooperate with the two drive screw holes with opposite thread directions to make the thickened strip drive block A and the thickened strip drive block B move towards the middle synchronously until the two sets of metal integrated strips are located on the front and rear sides of the smoke extraction fan blades respectively, so that the extended soft bristles can fully fit the outer walls of the front and rear ends of the smoke extraction fan blades. The entire adjustment process does not require disassembling the fan casing or blade disk, and can be quickly switched to the cleaning state as needed, reducing equipment maintenance time. After completing the above position adjustment, the power motor is controlled to drive the smoke exhaust fan blades to rotate slowly at a low speed and uniform speed. This allows the outer walls of the front and rear sides of the smoke exhaust fan blades to fully rub against the two sets of extended soft bristles, simultaneously brushing away the attached smoke and dust. This restores the original airflow capacity and smoke exhaust efficiency of the smoke exhaust fan blades. Since the extended soft bristles only contact the smoke exhaust fan blades, while the two metal integrated strips remain spaced from the smoke exhaust fan blades and impeller, there will be no hard metal collisions, which helps reduce the risk of blade wear and deformation. At the same time, the two sets of movable guide rods guide and limit the thickened strip-shaped drive blocks A and B, effectively preventing them from shifting or rotating during movement. This ensures that the two sets of extended soft bristles are always stably attached to the front and rear sides of the smoke exhaust fan blades, achieving synchronous cleaning. Compared with the traditional method of disassembling the machine or manually reaching into the fan to clean the blades one by one, this method has the advantages of high maintenance efficiency, wide cleaning coverage, minimal impact on the normal structure of the equipment, and low cost of repeated maintenance. It is more suitable for the long-term use of fire smoke exhaust equipment in construction shafts. Attached Figure Description

[0013] Figure 1 This is a front-view three-dimensional structural diagram of the fire smoke exhaust equipment for the construction shaft of the present invention; Figure 2 This is a rear side perspective three-dimensional structural diagram of the fire smoke exhaust device for the construction shaft of the present invention; Figure 3 This is a cross-sectional three-dimensional structural schematic diagram of the fire smoke exhaust equipment for the construction shaft of the present invention. Figure 4 This is a three-dimensional structural diagram of the interference-free fan blade cleaning device of the present invention in use. Figure 5 This is a schematic diagram of the individual three-dimensional structure of the interference-free fan blade cleaning device of the present invention; Figure 6 This is a partial three-dimensional structural diagram of the interference-free fan blade cleaning device of the present invention; Figure 7 This is a schematic diagram of the individual planar structure of the interference-free fan blade cleaning device of the present invention; The meanings of the labels in the diagram are as follows: 1. Electrical control box; 2. Mounting base; 3. Fan casing; 4. Support plate; 5. Fixed flange; 6. Exhaust fan blade; 7. Impeller; 8. Interference-free fan blade cleaning device; 9. Power motor; 10. Frame; 11. Fixing plate; 12. U-shaped thickened metal frame; 13. Thickened strip-shaped drive block A; 14. Thickened strip-shaped drive block B; 15. Bearing seat; 16. Drive motor; 17. Metal integrated strip; 18. Extended soft bristles; 19. Movable guide hole; 20. Drive screw hole; 21. Drive screw; 22. Movable guide rod; 23. Movable slot of integrated strip. Detailed Implementation

[0014] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "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 only for the convenience of describing this invention and 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 this invention.

[0016] Please see Figure 1-7 As shown, this embodiment provides a fire-fighting smoke exhaust device for exhausting smoke inside a construction shaft, including a fan casing 3. The fan casing 3 is cylindrical in shape, and a frame 10 is fixedly installed inside its rear center. The frame 10 is used to install a power motor 9. The center of the motor shaft of the power motor 9 is coaxial with the central axis of the fan casing 3 to ensure stable rotation of the impeller 7 during power output. The motor shaft at the front end of the power motor 9 is fixedly connected to the impeller 7 through a fixing plate and multiple screws. Multiple smoke exhaust fan blades 6 are equidistantly installed on the outer circumference of the impeller 7. The multiple smoke exhaust fan blades 6 are evenly distributed around the impeller 7. When the power motor 9 is running, it can drive the impeller 7 and the multiple smoke exhaust fan blades 6 to rotate synchronously at high speed, thereby forming a stable smoke exhaust airflow and realizing the rapid extraction of smoke, hot air and harmful gases inside the construction shaft.

[0017] like Figure 1 , Figure 2 and Figure 3 As shown, an electrical control box 1 is fixedly installed on the outer wall of the left side of the fan casing 3. The electrical control box 1 is electrically connected to the power motor 9 and the drive motor 16 respectively, and is used to control the smoke exhaust operation and the fan blade cleaning action respectively. Fixed flanges 5 are fixedly installed at both the front and rear ends of the fan casing 3. The front fixed flange 5 can be connected to the smoke exhaust duct of the construction shaft, and the rear fixed flange 5 can be fitted with a protective net to prevent foreign objects from entering the fan. Two sets of support plates 4 are set at the bottom of the fan casing 3. The two sets of support plates 4 are fixed together to the top of the mounting base 2. The mounting base 2 is installed on the foundation platform of the construction site by bolts to achieve stable fixation of the entire smoke exhaust equipment.

[0018] like Figure 1 , Figure 4 , Figure 5, Figure 6 and Figure 7 As shown, a non-interference fan blade cleaning device 8 is installed near the top front end and inside the fan casing 3. The non-interference fan blade cleaning device 8 includes a fixing plate 11, a U-shaped thickened metal frame 12, a thickened strip-shaped drive block A13, a thickened strip-shaped drive block B14, a bearing seat 15, a drive motor 16, a metal integrated strip 17, extended soft bristles 18, a movable guide hole 19, a drive screw hole 20, a drive screw 21, a movable guide rod 22, and a movable slot 23 for the integrated strip. The two fixing plates 11 are respectively fixed to both sides of the top outer wall of the fan casing 3 by multiple screws. The fixing plates 11 together support the U-shaped thickened metal frame 12, making the U-shaped thickened metal... The frame 12 is stably installed on the top of the fan casing 3 with the U-shaped opening facing downwards. Thickened strip-shaped drive blocks A13 and B14 are respectively installed on the front and rear sides of the U-shaped thickened metal frame 12. Both are sleeved on the outside of two movable guide rods 22 through the upper and lower movable guide holes 19. The two movable guide rods 22 are respectively fixed between the inner walls of the front and rear ends of the U-shaped thickened metal frame 12. Therefore, the thickened strip-shaped drive blocks A13 and B14 can only slide linearly along the axial direction of the movable guide rods 22, and will not rotate, tilt or shift left or right, thus ensuring that the cleaning mechanisms on both sides always maintain the accurate position.

[0019] like Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, thickened strip-shaped drive blocks A13 and B14 are respectively fixedly welded with metal integrated strips 17 at their bottom ends. Both metal integrated strips 17 extend downward into the interior of the fan cylinder 3 through the integrated strip movable slot 23 set at the top of the fan cylinder 3. One metal integrated strip 17 is located in front of the exhaust fan blade 6, and the other metal integrated strip 17 is located behind the exhaust fan blade 6. Neither of the two metal integrated strips 17 is in direct contact with the exhaust fan blade 6 and the impeller 7. The two metal integrated strips 17 are densely covered with extended soft bristles 18 on the opposite side. The extended soft bristles 18 are made of wear-resistant material with a certain degree of flexibility, which can avoid scratching the surface of the exhaust fan blade 6 while ensuring cleaning ability, and improve the long-term service life of the exhaust fan blade 6.

[0020] like Figure 1 , Figure 4 , Figure 5 , Figure 6 and Figure 7As shown, to achieve synchronous adjustment, thickened strip-shaped drive blocks A13 and B14 are respectively provided with drive screw holes 20 at their centers. The threads of the two drive screw holes 20 are opposite in direction and are connected to the outside of the same drive screw 21 by a common thread. The two ends of the drive screw 21 are respectively installed inside two bearing seats 15 through bearings. The drive motor 16 is fixedly installed in the rear bearing seat 15. The output shaft of the drive motor 16 is fixedly connected to the drive screw 21. Therefore, when the drive motor 16 runs, it can directly drive the drive screw 21 to rotate. Since the threads of the two drive screw holes 20 are opposite in direction, when the drive screw 21 rotates clockwise, the thickened strip-shaped drive block A13 moves forward and the thickened strip-shaped drive block B14 moves backward. The two sets of metal integrated strips 17 move closer to the exhaust fan blade 6 synchronously. When the drive screw 21 rotates in the opposite direction, the two sets of drive blocks retract synchronously to both ends, so that the two sets of metal integrated strips 17 return to their initial positions.

[0021] The implementation principle of a fire smoke exhaust device for venting smoke from inside a construction shaft, as described in this application, is as follows: When the equipment is performing normal fire smoke exhaust, the drive motor 16 remains stopped. At this time, the drive screw 21 does not rotate. The thickened strip drive block A13 and the thickened strip drive block B14 are located at the front and rear ends of the U-shaped thickened metal frame 12, respectively. The two sets of metal integrated strips 17 are kept away from the smoke exhaust fan blades 6, and the two sets of extended soft bristles 18 do not contact the smoke exhaust fan blades 6. Therefore, the entire interference-free fan blade cleaning device 8 will not affect the normal rotation of the smoke exhaust fan blades 6, nor will it increase the air duct resistance, thereby ensuring the continuous and stable smoke exhaust of the equipment. When the smoke exhaust equipment has been running for a long time, a large amount of smoke, dust and oil will be attached to the front and rear surfaces of the smoke exhaust fan blade 6, affecting the smoke exhaust efficiency. The power motor 9 should be stopped first to make the smoke exhaust fan blade 6 stop rotating completely. Then the drive motor 16 should be started. The drive motor 16 drives the drive screw 21 to rotate. Through the drive screw hole 20 set in opposite directions, the thickened strip drive block A13 and the thickened strip drive block B14 move synchronously towards the middle. The two sets of metal integrated strips 17 move to the front and rear sides of the smoke exhaust fan blade 6 respectively. The extended soft bristles 18 gradually adhere to the front and rear surfaces of the smoke exhaust fan blade 6 until the predetermined cleaning position is reached. Since the movable guide rod 22 always guides and limits the two sets of drive blocks, there will be no deviation or jamming during the entire adjustment process, ensuring that the bristles on both sides can evenly adhere to the surface of the smoke exhaust fan blade 6. After the two sets of extended soft bristles 18 are fully in contact with the front and rear surfaces of the exhaust fan blade 6, the drive motor 16 is stopped, and the power motor 9 is restarted. The power motor 9 is then controlled to drive the blade disc 7 to rotate slowly at a low and uniform speed, so that the exhaust fan blade 6 passes between the two sets of extended soft bristles 18. The extended soft bristles 18 continuously brush the smoke and dust adhering to the front and rear sides of the exhaust fan blade 6 through a flexible contact method, realizing online cleaning of the fan blade. The low-speed rotation method can avoid excessive impact on the extended soft bristles 18 when the exhaust fan blade 6 rotates at high speed, preventing the bristles from breaking, falling off, or wearing out too quickly, thus improving the service life of the bristles and the stability of cleaning. After the exhaust fan blades 6 have been completely cleaned, the power motor 9 is stopped, and then the drive motor 16 is driven to run in reverse, so that the thickened strip drive blocks A13 and B14 return to the positions at both ends of the U-shaped thickened metal frame 12. The two sets of metal integrated strips 17 exit the working area of ​​the exhaust fan blades 6. Finally, the power motor 9 is restarted to restore the exhaust equipment to normal high-speed exhaust state. The entire cleaning process can be completed without disassembling the fan casing, blades, and exhaust fan blades, which can ensure exhaust efficiency, reduce downtime maintenance time, and improve the continuous operation capability and maintenance convenience of the construction shaft fire exhaust equipment.

[0022] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fire-fighting smoke exhaust device for exhausting smoke inside a construction shaft, comprising a fan casing (3) and a frame (10) fixed inside its center rear side, wherein a power motor (9) is fixed at the top of the frame (10), and the center of the motor shaft of the power motor (9) is longitudinally aligned with the center of the fan casing (3), and an impeller (7) is fixed at the front end of the motor shaft of the power motor (9) by a fixing plate and screws, wherein multiple smoke exhaust fan blades (6) are equidistantly arranged on the circular outer wall of the impeller (7), and the smoke exhaust fan blades (6) are located at the front side of the center inside the fan casing (3), characterized in that: The fan casing (3) is equipped with a non-interference fan blade cleaning device (8) near the top of the front end and inside the casing. The interference-free fan blade cleaning device (8) includes a fixed plate (11), a U-shaped thickened metal frame (12), a thickened strip-shaped drive block A (13), a thickened strip-shaped drive block B (14), a movable guide hole (19), and a movable guide rod (22). The U-shaped thickened metal frame (12) has its U-shaped opening facing downwards and is placed near the top of the front end of the fan casing (3). Both ends of the opening of the U-shaped thickened metal frame (12) are provided with fixed plates (11), and both fixed plates (11) are fixed to the fan casing (3) by multiple screws. The top outer wall of the U-shaped thickened metal frame (12) has thickened strip-shaped drive blocks A (13) and B (14) on the front and rear sides of the center. The thickened strip-shaped drive blocks A (13) and B (14) are provided with movable guide holes (19) on the upper and lower sides of the center. Movable guide rods (22) are inserted into the two sets of movable guide holes (19). The front and rear ends of the two movable guide rods (22) are fixed on the inner walls of the front and rear ends of the U-shaped thickened metal frame (12).

2. The fire-fighting smoke exhaust equipment for the internal smoke discharge of a construction shaft according to claim 1, characterized in that: The interference-free fan blade cleaning device (8) also includes a metal integrated strip (17), extended soft bristles (18) and an integrated strip movable slot (23). The integrated strip movable slot (23) is provided below the opening of the U-shaped thickened metal frame (12), and the integrated strip movable slot (23) is longitudinally opened inside the top of the fan cylinder (3). The bottom ends of the thickened strip-shaped drive block A (13) and the thickened strip-shaped drive block B (14) are vertically welded with metal integrated strips (17). The two metal integrated strips (17) pass through the integrated strip movable slot (23) and extend downward into the fan cylinder (3). The two metal integrated strips (17) are located in front of and behind the exhaust fan blade (6) respectively. The side of the two metal integrated strips (17) facing the exhaust fan blade (6) is densely covered with extended soft bristles (18).

3. A fire-fighting smoke exhaust device for the internal smoke discharge of a construction shaft according to claim 2, characterized in that: The thickened strip-shaped drive block A (13) and the thickened strip-shaped drive block B (14) can slide back and forth outside the movable guide rod (22) through the movable guide hole (19) inside the U-shaped thickened metal frame (12). The two movable guide rods (22) can prevent the thickened strip-shaped drive block A (13) and the thickened strip-shaped drive block B (14) from rotating and shifting during the back and forth sliding process. When the thickened strip-shaped drive block A (13) and the thickened strip-shaped drive block B (14) approach the inner walls of the front and rear ends of the U-shaped thickened metal frame (12), the densely packed elongated soft bristles (18) on the metal integrated strip (17) do not contact the smoke exhaust fan blade (6).

4. A fire-fighting smoke exhaust device for the internal smoke discharge of a construction shaft according to claim 3, characterized in that: The interference-free fan blade cleaning device (8) also includes a bearing seat (15), a drive motor (16), a drive screw hole (20) and a drive screw (21). The thickened strip drive block A (13) and the thickened strip drive block B (14) are both provided with drive screw holes (20) in their center. The drive screw (21) is threaded into the two drive screw holes (20). The outer walls of the front and rear ends of the U-shaped thickened metal frame (12) are provided with bearing seats (15). The drive motor (16) is fixed on the bearing seat (15) on the rear side by a flange and screws. The drive motor (16) is electrically connected to the external control power supply through wires.

5. A fire-fighting smoke exhaust device for the internal smoke discharge of a construction shaft according to claim 4, characterized in that: The two ends of the drive screw (21) are respectively inserted into the bearings inside the two bearing seats (15), and the rear end of the drive screw (21) is fixedly connected to the motor shaft of the drive motor (16). The drive screw holes (20) inside the thickened strip drive block A (13) and the thickened strip drive block B (14) have opposite thread directions. The bottom ends of the two metal integrated strips (17) are close to the impeller (7) but do not contact the circular outer wall of the impeller (7).

6. A fire-fighting smoke exhaust device for exhausting smoke inside a construction shaft according to claim 5, characterized in that: During the clockwise rotation of the drive screw (21) driven by the drive motor (16), the drive screw (21) drives the thickened strip drive block A (13) to move forward and the thickened strip drive block B (14) to move backward through the two drive screw holes (20) with opposite thread directions, so that the two metal integrated strips (17) move closer to the exhaust fan blade (6) until the two sets of extended soft bristles (18) fully contact the front and rear end outer walls of the exhaust fan blade (6), while the exhaust fan blade (6) does not contact the two metal integrated strips (17) when it rotates.

7. A fire-fighting smoke exhaust device for exhausting smoke inside a construction shaft according to claim 1, characterized in that: The outer wall of the left side of the fan casing (3) is fixed with an electrical control box (1) by screws. The electrical control box (1) is electrically connected to an external control power supply, and the power motor (9) is electrically connected to the electrical control box (1) by wires. Fixed flanges (5) are welded to the outside of the openings at both ends of the fan casing (3). The fan casing (3) is connected and fixed to the connecting air duct through the fixed flange (5) at the front end. The fixed flange (5) at the rear end can be fixed with a protective net by screws.

8. A fire-fighting smoke exhaust device for the internal smoke discharge of a construction shaft according to claim 7, characterized in that: The fan casing (3) has a set of support plates (4) welded to the arc-shaped outer walls at the front and rear ends of the center. Both sets of support plates (4) extend vertically downwards. The bottom ends of both sets of support plates (4) are welded to the mounting base (2), and the mounting base (2) is fixed at the usage position by multiple screws.

Images