Positive pressure air supply outlet for building fire protection

Abstract

The utility model relates to building fire protection positive pressure air supply technical field especially relates to a building fire protection positive pressure air supply outlet. Including the air frame, the inner wall upper end of air frame is provided with the regulating valve, the inner wall bottom of air frame is provided with the sealing leaf plate, the surface fixedly connected with the installation frame of air frame, the inner wall rotationally connected with a plurality of fan leaf plate frame of installation frame, the position of one side of air frame inner wall corresponds fan leaf plate frame and is provided with adjusting device, the adjusting device includes servo motor, the bottom of servo motor and the inner wall surface fixedly connected with air frame, the output fixedly connected with the rotating disc of servo motor, the surface one side rotationally connected with the rotating rod of rotating disc, the inner wall surface fixedly connected with the slide rail of air frame, the surface slidingly connected with the slide frame of slide rail, the upper end surface fixedly connected with the support rod of slide frame. The utility model provides a building fire protection positive pressure air supply outlet has the advantages such as positive pressure air supply control, airflow optimization adjustment.

Description

Technical Field

[0001] This utility model relates to the field of positive pressure air supply technology for building fire protection, and in particular to a positive pressure air supply outlet for building fire protection. Background Technology

[0002] Positive pressure air supply outlets are typically designed with several key components, such as fans, ductwork, air outlets, and control systems. Fans are responsible for delivering fresh air into the building through the ductwork, while air outlets distribute the airflow evenly to the required areas. The system's control is often linked to fire detectors, enabling automatic activation in the event of a fire to quickly create a positive pressure zone and slow the spread of smoke. Furthermore, the materials and sealing performance of the positive pressure air supply outlets are particularly important to ensure effective airflow and system durability.

[0003] Existing technologies, such as the utility model patent with publication number CN217844254U, disclose a positive pressure air supply outlet for building fire protection. This patent includes a frame with two chambers within it. One chamber houses an actuator, and the other chamber is an air outlet with louvers at its opening. A baffle is installed on the end face of the air outlet away from the louvers, and the baffle has multiple vertically oriented ventilation slots arranged horizontally in an array. In this utility model, when the fuse melts at high temperature, the actuator closes the louvers. During the closing process, a linkage component causes a blocking element to slide, thereby blocking multiple ventilation slots. The closing of the louvers and the sealing of the baffle further prevent the spread of fire. Compared to simply closing the louvers to prevent fire spread, the baffle design significantly improves the effectiveness.

[0004] In daily use, it has been found that when adjusting the opening of the louvers of the air supply outlet, the rotation angle of each blade plate is inconsistent, manual operation is laborious and difficult to control precisely, which leads to problems such as disordered air supply direction, substandard positive pressure air supply effect and delayed fire linkage response. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies, which, during daily use, result in inconsistent rotation angles of the various fan blades and frames, making manual operation laborious and difficult to control precisely. Consequently, these issues lead to disordered airflow direction, substandard positive pressure airflow, and delayed fire alarm response.

[0006] To solve the above-mentioned technical problems, this utility model provides a positive pressure air supply outlet for building fire protection, comprising: an air frame, an adjusting valve provided at the upper end of the inner wall of the air frame, a sealing blade provided at the bottom end of the inner wall of the air frame, an installation frame fixedly connected to the surface of the air frame, a plurality of fan blade holders rotatably connected to the inner wall of the installation frame, an adjusting device provided on one side of the inner wall of the air frame corresponding to the position of the fan blade holders, the adjusting device including a servo motor, the bottom end of the servo motor being fixedly connected to the inner wall surface of the air frame, a rotating disk fixedly connected to the output end of the servo motor, a rotating rod rotatably connected to one side of the surface of the rotating disk, a slide rail fixedly connected to the inner wall surface of the air frame, a slide frame slidably connected to the surface of the slide rail, a support rod fixedly connected to the upper surface of the slide frame, the arc surface of the support rod rotatably connected to one end of the rotating rod, a connecting plate fixedly connected to one side of the slide frame, a gear fixedly connected to the arc surface of one end of the fan blade holder, the teeth of a plurality of gears meshing with the same rack, and one end of the connecting plate being fixedly connected to one side surface of the rack.

[0007] The aforementioned components achieve the following effect: by activating the servo motor to drive the rotating disk and rotating rod, the sliding frame moves along the slide rail, which in turn drives the rack to reciprocate. The rack, through meshing with multiple gears, synchronously drives all fan blade frames to rotate. This structure achieves automated, precise, and synchronous adjustment of the opening and closing angles of multiple fan blades, avoiding the inconvenience and errors of manual operation, and improving the response speed and reliability of the positive pressure air supply outlet in fire-fighting conditions.

[0008] Preferably, the surface of the slide rail is provided with a slide groove, and both ends of the inner wall of the slide frame are rotatably connected to pulleys, the arc surface of the pulleys being slidably connected to the inner wall of the slide groove.

[0009] The effect achieved by the above components is that the sliding friction between the slide frame and the slide rail is transformed into rolling friction through the rolling cooperation of the pulley and the slide groove, which significantly reduces the motion resistance, makes the reciprocating motion of the slide frame more stable and smooth, and at the same time reduces component wear and extends the service life of the device.

[0010] Preferably, a limiting frame is fixedly connected to the inner wall surface of the wind frame, and the surface of the limiting frame is slidably connected to the inner wall of the rack.

[0011] The effect achieved by the above components is that the limit frame provides guidance and constraint for the reciprocating linear motion of the rack, preventing the rack from deviating, vibrating, or disengaging from the gear during transmission, thereby ensuring transmission accuracy and operational stability.

[0012] Preferably, a stop block is fixedly connected to both sides of the inner wall of the mounting frame at the position corresponding to the rack, and a protective block is fixedly connected to the surface of the stop block, the protective block being a rubber block.

[0013] The effects achieved by the above components are as follows: the stop block is used to limit the maximum stroke of the rack and prevent it from exceeding the range of motion; the rubber protective block plays a buffering role when the rack contacts the stop block, absorbing impact energy, reducing noise and avoiding component damage caused by rigid collisions.

[0014] Preferably, an auxiliary device is provided on the upper surface of the air frame. The auxiliary device includes a closing plate, one side of which is rotatably connected to the upper surface of the air frame. A through groove is formed on one side surface of the closing plate. A connecting rod is fixedly connected to the inner wall of the through groove. A connecting frame is slidably connected to the surface of the connecting rod. A fixing ring is fixedly connected to the lower surface of the connecting frame. A moving rod is slidably connected to the inner wall of the fixing ring. An embedded ring is fixedly connected to the end of the moving rod near the regulating valve. The embedded ring is an elastic ring with a cross-section shaped like a split funnel. A positioning frame is fixedly connected to the upper inner wall surface of the air frame. A limit block is fixedly connected to the upper arc surface of the positioning frame. An adjusting block slides through the upper arc surface of the positioning frame.

[0015] The aforementioned components achieve the following effects: Utilizing the flipping and locking action of the closing plate, the insert ring, through its funnel-shaped elastic structure, quickly engages with the limiting block and adjusting block. The elastic radial clamping force achieves rapid locking of the closing plate, preventing accidental opening due to vibration or accidental contact, thus effectively protecting the internal space at the top of the air frame. Furthermore, this structure only requires pushing and pulling the moving rod to complete locking and unlocking operations, eliminating the need for additional tools. It boasts advantages such as ease of operation and reliable locking, improving the convenience of daily maintenance and the safety of use of the air vent.

[0016] Preferably, the cross-sectional dimensions of the inlaid ring are adapted to the cross-sectional dimensions of the limiting block and the adjusting block. The adjusting block and the limiting block are distributed in a mirror symmetrical manner, and the side of the adjusting block that is far away from the limiting block is a central conical curved surface. The cross-sections of the adjusting block and the limiting block are concentric annular convex ridges.

[0017] The effects achieved by the above components are as follows: the appropriate size ensures that the insert ring can tightly hold the limiting block and the adjusting block; the arc-shaped end plays a guiding role during assembly, allowing the components to be inserted into the insert ring more smoothly, reducing the difficulty of assembly, and reducing scratches and wear during the insertion process.

[0018] Preferably, a spring is fitted onto the end of the moving rod away from the inlaid ring, and the two ends of the spring are fixedly connected to the moving rod and the fixed ring, respectively.

[0019] The effects achieved by the above components are as follows: the spring provides a continuous elastic preload, enabling the moving rod and the insert ring to automatically reset and remain locked when not subjected to external force, preventing loosening due to vibration or other reasons; at the same time, the spring force also ensures a constant contact pressure between the insert ring and the adjusting block and the limiting block, enhancing the reliability of locking.

[0020] Compared with related technologies, the positive pressure air supply outlet for building fire protection provided by this utility model has the following beneficial effects: This invention provides a positive pressure air supply outlet for building fire protection. Through the operation of the adjustment device, it achieves automated, precise, and synchronous adjustment of multiple fan blade frames, realizing unified control of the fan blade opening and closing angles. This improves response speed, transmission accuracy, and operational reliability in fire situations, while reducing component wear and extending service life. A servo motor serves as the power source, converting rotational motion into linear reciprocating motion of the sliding frame along the slide rail via a rotating disk and rod. The motion is then transmitted through a connecting plate to move the rack, which simultaneously engages multiple gears, driving all fan blade frames to rotate synchronously. This transmission chain achieves unified and automated angle adjustment of multiple air supply blades, avoiding the inconvenience and errors of traditional manual operation. In the event of a fire, the air outlet can be quickly opened or closed as needed, meeting the rapid response requirements of the positive pressure air supply system.

[0021] By operating the auxiliary device, the closing plate is quickly locked using elastic radial clamping force, preventing accidental opening due to vibration or accidental contact. This effectively protects the internal space at the top of the air frame. Pulling the moving rod moves the insert ring, causing it to fit over the limiting block and adjusting block on the positioning frame. Because the insert ring has a cleaved funnel-shaped cross-section, it generates radial clamping force when engaging with the limiting block and adjusting block, achieving fast and reliable mechanical locking. Compared to traditional bolt fixing methods, this device is quicker to operate, requires no special tools, and greatly simplifies the installation and debugging process of the regulating valve in the air outlet. Attached Figure Description

[0022] Figure 1 A structural schematic diagram of a positive pressure air supply outlet for building fire protection provided by this utility model; Figure 2 for Figure 1 A partial structural diagram of the three-dimensional structure shown; Figure 3 for Figure 1 The diagram shows the structure of the regulating device. Figure 4 for Figure 1 The diagram shows the structure of the auxiliary device.

[0023] The following are the labeling elements in the diagram: 1. Wind frame; 2. Regulating valve; 3. Sealing blade; 4. Adjusting device; 401. Servo motor; 402. Rotary disk; 403. Rotating rod; 404. Gear; 405. Rack; 406. Limiting frame; 407. Slide rail; 408. Slide frame; 409. Slide groove; 410. Pulley; 411. Support rod; 412. Connecting plate; 413. Stop block; 414. Protective block; 5. Auxiliary device; 501. Closing plate; 502. Through groove; 503. Connecting rod; 504. Connecting frame; 505. Fixing ring; 506. Moving rod; 507. Spring; 508. Embedded ring; 509. Positioning frame; 510. Adjusting block; 511. Limiting block; 6. Fan blade frame; 7. Mounting frame. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0026] Example 1, please refer to Figures 1 to 4 The present invention provides a positive pressure air supply outlet for building fire protection, comprising: an air frame 1, an adjusting valve 2 provided at the upper end of the inner wall of the air frame 1, a sealing blade 3 provided at the bottom end of the inner wall of the air frame 1, an installation frame 7 fixedly connected to the surface of the air frame 1, a plurality of fan blade brackets 6 rotatably connected to the inner wall of the installation frame 7, an adjusting device 4 provided on one side of the inner wall of the air frame 1 corresponding to the position of the fan blade brackets 6, and an auxiliary device 5 provided on the upper surface of the air frame 1.

[0027] In the embodiments of this utility model, please refer to Figure 3The adjustment device 4 includes a servo motor 401. The bottom end of the servo motor 401 is fixedly connected to the inner wall surface of the fan frame 1. The output end of the servo motor 401 is fixedly connected to a rotating disk 402. A rotating rod 403 is rotatably connected to one side of the surface of the rotating disk 402. A slide rail 407 is fixedly connected to the inner wall surface of the fan frame 1. A slide frame 408 is slidably connected to the surface of the slide rail 407. A support rod 411 is fixedly connected to the upper surface of the slide frame 408. The arc surface of the support rod 411 is rotatably connected to one end of the rotating rod 403. A connecting plate 412 is fixedly connected to one side of the slide frame 408. A gear 404 is fixedly connected to the arc surface of one end of the fan blade frame 6. The tooth surfaces of several gears 404 mesh with the same rack 405. One end of the connecting plate 412 is fixedly connected to one side surface of the rack 405. By activating the servo motor 401 to drive the rotating disk 402 and rotating rod 403, the sliding frame 408 is driven to move along the slide rail 407. In turn, the connecting plate 412 drives the rack 405 to reciprocate. The rack 405, through meshing with multiple gears 404, synchronously drives all fan blade frames 6 to rotate. This structure realizes automated, precise and synchronous adjustment of the opening and closing angles of multiple fan blades, avoiding the inconvenience and errors of manual operation, and improving the response speed and reliability of the positive pressure air supply outlet in fire-fighting conditions. The surface of the slide rail 407 is provided with a sliding groove 409, and both ends of the inner wall of the sliding frame 408 are rotatably connected to pulleys 410. The arc surface of the pulleys 410 is slidably connected to the inner wall of the sliding groove 409. Through the rolling engagement of pulley 410 and slide groove 409, the sliding friction between slide frame 408 and slide rail 407 is transformed into rolling friction, significantly reducing motion resistance and making the reciprocating motion of slide frame 408 more stable and smooth. This also reduces component wear and extends the service life of the device. A limit frame 406 is fixedly connected to the inner wall surface of the wind frame 1, and the surface of the limit frame 406 is slidably connected to the inner wall of rack 405. The limit frame 406 provides guidance and constraint for the reciprocating linear motion of rack 405, preventing rack 405 from deviating, vibrating, or disengaging from gear 404 during transmission, thereby ensuring transmission accuracy and operational stability. Stop blocks 413 are fixedly connected to both sides of the inner wall of mounting frame 7 corresponding to the positions of rack 405. Protective blocks 414, which are rubber blocks, are fixedly connected to the surface of the stop blocks 413. The stop block 413 is used to limit the maximum stroke of the rack 405 to prevent it from exceeding the range of motion; the rubber protective block 414 acts as a buffer when the rack 405 contacts the stop block 413, absorbing impact energy, reducing noise and avoiding component damage caused by rigid collision. In the embodiments of this utility model, please refer to Figure 4The auxiliary device 5 includes a closing plate 501. One side of the closing plate 501 is rotatably connected to the upper surface of the wind frame 1. A through groove 502 is provided on one side surface of the closing plate 501. A connecting rod 503 is fixedly connected to the inner wall of the through groove 502. A connecting frame 504 is slidably connected to the surface of the connecting rod 503. A fixing ring 505 is fixedly connected to the lower surface of the connecting frame 504. A moving rod 506 is slidably connected to the inner wall of the fixing ring 505. An inlaid ring 508 is fixedly connected to the end of the moving rod 506 near the regulating valve 2. The inlaid ring 508 is an elastic ring with a cross-section in the shape of a split funnel. A positioning frame 509 is fixedly connected to the upper inner wall surface of the wind frame 1. A limit block 511 is fixedly connected to the upper arc surface of the positioning frame 509. An adjusting block 510 slides through the upper arc surface of the positioning frame 509. The moving rod 506 drives the inlaid ring 508 to move. Utilizing its funnel-shaped elastic structure, it generates radial clamping force when engaging with the limiting block 511 and adjusting block 510, preventing the closing plate 501 from accidentally opening due to vibration or accidental contact, thus effectively protecting the internal space at the upper end of the wind frame 1. Simultaneously, this structure only requires pushing and pulling the moving rod 506 to complete the locking and unlocking operations, without the need for additional tools, making it easy to operate. The cross-sectional dimensions of the inlaid ring 508 are adapted to the cross-sectional dimensions of the limiting block 511 and adjusting block 510. The adjusting block 510 and the limiting block 511 are mirror-symmetrically distributed, and the side of the adjusting block 510 that is far from the limiting block 511 is a central conical curved surface. The cross-sections of the adjusting block 510 and the limiting block 511 are concentric annular convex ridges. The appropriate dimensions ensure that the insert ring 508 can tightly grip the limiting block 511 and the adjusting block 510. The arc-shaped end acts as a guide during assembly, allowing the components to be inserted into the insert ring 508 more smoothly, reducing assembly difficulty and minimizing scratches and wear during insertion. A spring 507 is sleeved on the end of the moving rod 506 away from the insert ring 508, with both ends of the spring 507 fixedly connected to the moving rod 506 and the fixing ring 505, respectively. The spring 507 provides a continuous elastic preload, enabling the moving rod 506 and the insert ring 508 to automatically reset and remain locked when no external force is applied, preventing loosening due to vibration or other reasons. At the same time, the spring 507 also ensures a constant contact pressure between the insert ring 508 and the adjusting block 510 and the limiting block 511, enhancing the reliability of the locking mechanism. The working principle of the positive pressure air supply outlet for building fire protection provided by this utility model is as follows: When there is no fire signal or the system is in standby mode, the regulating valve 2 is in the closed position. At this time, the regulating valve 2 presses the sealing blade 3 against the sealing surface at the bottom of the air frame 1 through the linkage mechanism, completely blocking the airflow channel. Positive pressure air cannot flow out from the air supply outlet, maintaining the non-air supply state of the stairwell or anteroom; after receiving the fire linkage signal, the actuator inside the regulating valve 2 is activated, driving the valve stem to rotate or move linearly. This movement is transmitted to the sealing blade 3 through the linkage mechanism, causing the sealing blade 3 to rotate around its hinge point or translate along the guide rail, thereby opening the air duct section. The positive pressure air in the upstream air duct can then flow through the air frame 1 to the louver window area where the fan blade frame 6 is located. The regulating valve 2 can achieve stepless or stepped opening control, so that the sealing blade 3 can stay in any intermediate position, thereby adjusting the air supply volume to meet the air volume requirements of different fire compartments or different working conditions. When the sealing blade 3 is in the closed position, its edge is usually provided with an elastic sealing strip, which fits tightly against the inner wall of the air frame 1 to ensure air tightness and prevent smoke backflow or air leakage.

[0028] The fan blade holder 6 is installed in the mounting frame 7 on the front of the air frame 1, and multiple fan blade holders 6 are arranged in parallel to form a louver window. The adjustment device 4 is independent of the adjustment valve 2 and is specifically used to change the tilt angle of the fan blade holder 6 to optimize the air outlet direction and airflow distribution. The servo motor 401 is fixed to the inner wall of the air frame 1, and the output shaft drives the rotating disk 402 to rotate. The eccentric position of the rotating disk 402 is connected to the rotating rod 403 through the rotating shaft, and the other end of the rotating rod 403 is connected to the support rod 411 at the upper end of the sliding frame 408. When the motor rotates, the rotating disk 402 drives the rotating rod 403 to swing, which in turn pushes the sliding frame 408 to make reciprocating linear motion along the slide rail 407. The slide rail 407 has a slide groove 409, and the pulleys 410 at both ends of the inner wall of the sliding frame 408 roll in the slide groove 409, changing the sliding friction into rolling friction, ensuring smooth movement and low wear. The sliding frame 408 drives the rack 405 to move linearly through the connecting plate 412. The rack 405 meshes simultaneously with all the gears 404 fixed on the rotating shaft of the fan blade frame 6. When the rack 405 moves, all the gears 404 rotate synchronously, driving each fan blade frame 6 to rotate synchronously with the same angular velocity and the same rotation angle. When the fan blade frame 6 rotates to be perpendicular to the airflow direction, even if the sealing blade 3 is open, the air outlet is blocked by the louvers, which can be used for fine adjustment or to completely close the air outlet surface. When the fan blade frame 6 rotates to be parallel to the airflow direction, the airflow resistance is minimized and the air volume is maximized. When it is necessary to close the closing plate 501 to protect the regulating valve 2, the operator flips the closing plate 501 downwards, gradually bringing it closer to the upper opening of the air frame 1. The adjusting block 510 on the closing plate 501 aligns with the limiting block 511 on the positioning frame 509 and is pushed towards the funnel-shaped opening of the inlay ring 508. Since the large end of the inlay ring 508 is open and the end of the mating part is arc-shaped, the two automatically slide into each other after contact, achieving automatic guidance and centering without the need for precise alignment. When the limiting block 511 and the adjusting block 510 are fully inserted into the cavity of the inlay ring 508, since the inner diameter of the inlay ring 508 is slightly smaller than the outer diameter of the mating part, the elastic ring is forced to expand radially, generating a radial clamping force, which firmly locks the closing plate 501 to the air frame 1. Meanwhile, the axial preload of the spring 507 keeps the insert ring 508 pressed against the mating parts, preventing the closing plate 501 from opening accidentally due to vibration or accidental contact. Due to the slit design of the insert ring 508, it remains clamped even without external force, and the spring 507 continuously applies preload, so non-operators cannot directly pull open the closing plate 501, achieving a reliable anti-arbitrary opening function. When it is necessary to open the closing plate 501 to inspect the internal components of the adjustment frame, the operator only needs to continue pushing the moving rod 506 to move the insert ring 508 toward the adjustment block 510 until the insert ring 508 covers the adjustment block 510, and then pull the moving rod 506 back, so that the adjustment block 510 fits with the limiting block 511, thereby allowing the insert ring 508 to disengage from the adjustment block 510 and the limiting block 511. At this time, the slit of the insert ring 508 can expand and disengage from the mating parts, and the closing plate 501 can be easily flipped upwards to open. By setting the adjusting block 510 and the limiting block 511 to be mirror-symmetrically distributed, and both ends of the two being far apart having a central conical curved surface and a concentric annular convex ridge cross section, the auxiliary device 5 forms a quick-wedge snap-locking structure. The whole process requires no tools and is easy to operate.

[0029] In Example 2, the regulating valve 2 presses the sealing blade 3 against the sealing surface at the bottom of the air frame 1 through a linkage mechanism. The linkage mechanism includes a connecting sleeve, a driving crank, a transmission connecting rod, and a driven rocker arm. The output end of the regulating valve 2 is fixedly connected to a valve stem. One end of the valve stem extends out of the inner wall side plate of the air frame 1 and is fixed to the connecting sleeve. One end of the driving crank is integrally formed with the outer wall of the connecting sleeve, and the axis of the driving crank is perpendicular to the axis of the valve stem. The edge of the sealing blade 3 is provided with a hinge shaft. The hinge shaft is rotatably installed in the shaft seat on the inner wall of the bottom of the air frame, and one end of the hinge shaft also extends out of the inner wall side plate of the air frame. One end of the driven rocker arm is fixedly sleeved on the extended end of the hinge shaft. The two ends of the transmission connecting rod are respectively hinged to the other end of the driving crank and the other end of the driven rocker arm through pins. In the closed state: When there is no fire alarm signal in the building, the spring actuator built into the regulating valve 2 drives the valve stem to rotate clockwise. The valve stem drives the active crank to swing synchronously, and the active crank pulls the rocker arm to swing around the hinge shaft through the transmission connecting rod. At this time, the rocker arm drives the hinge shaft to rotate, forcing the sealing vane 3 to flip upward or move forward, ultimately making the sealing strip at the edge of the sealing vane 3 tightly fit against the sealing surface at the bottom of the air frame 1, achieving airtight blockage.

[0030] In the open state: When a fire alarm linkage signal is received, the actuator in the regulating valve 2 actuates, driving the valve stem to rotate counterclockwise. The driving crank swings in the opposite direction, pushing the driven rocker arm through the transmission connecting rod, causing the sealing vane 3 to rotate outward around the hinge axis, thereby opening the airflow passage.

[0031] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0032] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A positive pressure air supply outlet for building fire protection, characterized in that, include: A wind frame (1) is provided with an adjusting valve (2) at the upper end of its inner wall and a sealing blade (3) at the bottom end of its inner wall. A mounting frame (7) is fixedly connected to the surface of the wind frame (1). Several fan blade holders (6) are rotatably connected to the inner wall of the mounting frame (7). An adjusting device (4) is provided on one side of the inner wall of the wind frame (1) corresponding to the fan blade holders (6). The adjusting device (4) includes a servo motor (401). The bottom end of the servo motor (401) is fixedly connected to the inner wall surface of the wind frame (1). A rotating disk (402) is fixedly connected to the output end of the servo motor (401). A rotating rod (403) is rotatably connected to one side of the surface of the rotating disk (402). The wind frame (1) A slide rail (407) is fixedly connected to the inner wall surface of the fan frame (1). A slide frame (408) is slidably connected to the surface of the slide rail (407). A support rod (411) is fixedly connected to the upper surface of the slide frame (408). The arc surface of the support rod (411) is rotatably connected to one end of the rotating rod (403). A connecting plate (412) is fixedly connected to one side of the slide frame (408). A gear (404) is fixedly connected to the arc surface of one end of the fan blade frame (6). The teeth of several gears (404) mesh with the same rack (405). One end of the connecting plate (412) is fixedly connected to one side surface of the rack (405). An auxiliary device (5) is provided on the upper surface of the fan frame (1). The auxiliary device (5) includes... A closing plate (501) is rotatably connected to the upper surface of the wind frame (1) on one side. A through groove (502) is provided on one side surface of the closing plate (501). A connecting rod (503) is fixedly connected to the inner wall of the through groove (502). A connecting frame (504) is slidably connected to the surface of the connecting rod (503). A fixing ring (505) is fixedly connected to the lower surface of the connecting frame (504). A moving rod (506) is slidably connected to the inner wall of the fixing ring (505). An inlaid ring (508) is fixedly connected to the end of the moving rod (506) near the regulating valve (2). The inlaid ring (508) is an elastic ring. The cross-section of the inlaid ring (508) is a slit funnel shape. The wind frame (1) A positioning frame (509) is fixedly connected to the upper inner wall surface of the moving rod (506). A limiting block (511) is fixedly connected to the upper arc surface of the positioning frame (509). An adjusting block (510) slides through the upper arc surface of the positioning frame (509). The cross-sectional dimensions of the inlaid ring (508) are adapted to the cross-sectional dimensions of the limiting block (511) and the adjusting block (510). The adjusting block (510) and the limiting block (511) are distributed in a mirror symmetrical manner. The side of the adjusting block (510) and the limiting block (511) that is far away from each other is a central conical curved surface. The cross-section of the adjusting block (510) and the limiting block (511) is a concentric annular convex ridge. A spring (507) is sleeved on the end of the moving rod (506) that is far away from the inlaid ring (508).The two ends of the spring (507) are fixedly connected to the moving rod (506) and the fixed ring (505), respectively.

2. A positive pressure air supply outlet for building fire protection according to claim 1, characterized in that, The slide rail (407) has a slide groove (409) on its surface. Both ends of the inner wall of the slide frame (408) are rotatably connected to pulleys (410). The arc surface of the pulley (410) is slidably connected to the inner wall of the slide groove (409).

3. A positive pressure air supply outlet for building fire protection according to claim 1, characterized in that, A limiting frame (406) is fixedly connected to the inner wall surface of the wind frame (1), and the surface of the limiting frame (406) is slidably connected to the inner wall of the rack (405).

4. A positive pressure air supply outlet for building fire protection according to claim 1, characterized in that, The mounting frame (7) has a stop block (413) fixedly connected to the position of the rack (405) on both sides of the inner wall. The surface of the stop block (413) is fixedly connected to a protective block (414), which is a rubber block.

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