Overhead exhaust fan

Abstract

The invention relates to an overhead exhaust fan, and relates to the field of ventilation and exhaust technologies. The device comprises a base shell; the ventilation channel is arranged on the base shell and used for air circulation; the baffle is movably arranged on the base shell, and the baffle moves to be used for controlling opening or closing of the ventilation channel; the control assembly is arranged between the baffle and the base shell and used for controlling the baffle to move; the fan is mounted on the base shell or the baffle and is used for driving airflow to pass through the ventilation channel; a heat insulation plate is movably arranged on the side, away from the baffle, of the base shell and used for shielding the ventilation channel and relieving the influence of high temperature on the control assembly, the draught fan and related electrical elements, and a driving assembly used for controlling the heat insulation plate to move is arranged on the base shell. The fire resistance of the fan can be improved, so that toxic gas, combustible gas and high-temperature gas generated after a fire disaster are discharged in time after the fire disaster is extinguished.

Description

Technical Field

[0001] This application relates to the field of ventilation technology, and in particular to a top-mounted exhaust fan. Background Technology

[0002] In numerous industrial and civilian applications, energy storage containers, battery cabinets, and power distribution cabinets operate at high speeds, inevitably generating significant heat. If this heat cannot be dissipated effectively and promptly, the internal temperature will rise sharply, impacting the performance and lifespan of the internal equipment and related electronic components, and potentially leading to serious consequences such as equipment malfunction or damage. Therefore, timely and effective ventilation is crucial for maintaining a stable internal environment and ensuring long-term, reliable operation.

[0003] Traditional exhaust fans include a base shell installed on the target device, a ventilation channel on the base shell to connect the inside and outside of the target device, a fan installed inside the base shell, a baffle installed on the side of the base shell facing the outside of the target device to cover the ventilation channel, and a control mechanism inside the base shell to control the opening and closing of the baffle.

[0004] When a fire breaks out inside the target device, and the internal temperature rises rapidly and exceeds the temperature threshold that the exhaust fan's internal control mechanism, related electronic components, and wiring can withstand within a short period, the exhaust fan will fail quickly. Under such intense high-temperature impact, the control mechanism may lose its control function due to thermal deformation, the electrical performance of electronic components will deteriorate sharply or even fail completely, and the wiring may also experience short circuits and other faults due to insulation damage, ultimately leading to the rapid failure of the exhaust fan.

[0005] More seriously, after the fire is extinguished, the malfunctioning fans cannot be turned on properly, making it difficult to quickly release the toxic, flammable, and high-temperature gases produced after the fire. These harmful gases accumulate inside the equipment, which not only causes secondary damage to the equipment but may also trigger secondary disasters such as fires or explosions, posing a significant safety hazard that seriously threatens the safety of personnel and equipment. Summary of the Invention

[0006] In order to improve the fire resistance of the fan so that toxic gases, combustible gases and high-temperature gases generated after the fire is extinguished, this application provides a top-mounted exhaust fan.

[0007] The technical solution for a top-mounted exhaust fan provided in this application is as follows: A top-mounted exhaust fan, comprising: The base shell is fitted with fire-resistant insulation panels on its outer wall; A ventilation channel is provided on the base shell for air circulation; A baffle is movably mounted on the base shell, and the movement of the baffle is used to control the opening or closing of the ventilation channel; A control component, disposed between the baffle and the base shell, is used to control the movement of the baffle; A fan, which is mounted on the base shell or the baffle and is used to drive airflow through the ventilation channel; A heat insulation plate is movably disposed on the side of the base shell away from the baffle. The heat insulation plate is used to shield the ventilation channel and alleviate the effects of high temperature on the control components, fan and related electrical components. A drive component for controlling the movement of the heat insulation plate is disposed on the base shell.

[0008] By adopting the above technical solution, the base shell provides a supporting foundation for the overall structure; the ventilation duct enables air communication, meeting exhaust requirements; the control components control the movement of the baffles, thereby controlling the opening or closing of the ventilation ducts and flexibly adjusting the exhaust status; the fan drives airflow through the ventilation ducts to achieve the exhaust function; the heat insulation plate, movable on the side of the base shell away from the baffle, can shield the ventilation ducts, reduce heat transfer, and prevent the spread of flames. The drive components control the heat insulation plate to shield the base shell and ventilation ducts, or remove the shielding effect. In the event of a sudden fire inside the target device causing a rapid rise in ambient temperature, shielding the ventilation ducts with the heat insulation plate helps prevent the spread of fire. Covering the base shell with heat insulation and fire-resistant insulation boards reduces the possibility of failure of the drive components, control components, and electrical components inside the base shell due to high temperatures. After the fire is extinguished, it increases the probability of the fan starting normally, rapidly discharging toxic gases, combustible gases, and high-temperature gases from the device or workshop.

[0009] Optionally, an inclined guide plate is provided on the peripheral wall of the baffle, and the side of the inclined guide plate away from the baffle is inclined toward the base shell for guiding the flow; When the baffle is open or closed, the projections of the baffle and the inclined guide plate on the base shell always cover the control component and the ventilation channel.

[0010] By adopting the above technical solution, the inclined guide plate on the periphery of the baffle is inclined towards the base shell, which can guide the water flow or impurities falling on the baffle and reduce the retention of water flow or impurities on the baffle. In addition, by setting the inclined guide plate on the periphery of the baffle, the shielding effect on the base is increased, which can more effectively reduce the entry of rainwater into the base and the corrosion of electrical components, control components or fans and other equipment.

[0011] Optionally, the fan is fixedly connected to the baffle and moves with the baffle; The fan is a centrifugal fan, used to direct airflow perpendicular to the baffle in a direction parallel to the baffle.

[0012] By adopting the above technical solution, the fan is fixedly connected to the baffle and moves with the baffle, which facilitates the overall structural layout and collaborative work; the centrifugal fan directs the airflow perpendicular to the baffle in a direction parallel to the baffle, changes the airflow direction, makes the exhaust direction more in line with actual needs, reduces the impact of the baffle on the air volume, and improves the exhaust effect.

[0013] Optionally, a water baffle is provided on the side of the base shell facing the baffle, and the control components and ventilation channels are both located within the area enclosed by the water baffle.

[0014] By adopting the above technical solution, a water baffle extends from the base shell towards the baffle side, which can surround the control components and ventilation channels within its range, effectively preventing external water and other liquids from entering, protecting the control components and ventilation channels, and improving the waterproof performance and service life of the equipment.

[0015] Optionally, the base shell is provided with a sealing strip on the side facing the baffle to abut against the baffle. The sealing strip is arranged around the outline of the baffle, and one side of the sealing strip is provided with an annular groove for the baffle to be inserted into.

[0016] By adopting the above technical solution, the sealing gasket on the side of the base shell facing the baffle is provided with an annular groove along the water baffle for the baffle to insert into, which can enhance the sealing between the baffle and the base shell, prevent air leakage and the entry of external impurities, and ensure the normal operation of the equipment.

[0017] Optionally, the side of the sealing strip facing the baffle plate is an elastic part, and the elastic part is provided with a cavity to increase the amount of elastic deformation, thereby improving the sealing effect between the elastic part and the inner wall of the baffle plate.

[0018] By adopting the above technical solution, a cavity is set in the elastic part of the sealing gasket facing the water baffle, which increases the elastic deformation and makes the elastic part fit more tightly with the inner wall of the water baffle, thereby further improving the sealing effect and effectively preventing liquid and dust from entering.

[0019] Optionally, an air guide tube is fixedly connected to the side of the base shell away from the baffle. The air guide tube extends into the base shell and forms a receiving cavity with the inner wall of the base shell for accommodating electrical components and the control assembly.

[0020] By adopting the above technical solution, the air guide duct extends into the base shell and forms an installation chamber with the inner wall of the base shell. It can be used to accommodate electrical components and control components, and play a protective role for the electrical components and control components. At the same time, the air guide duct can guide the airflow and optimize the exhaust path.

[0021] Optionally, the control component includes a scissor lift mechanism disposed between the base shell and the baffle, and a drive mechanism for driving the scissor lift mechanism to work.

[0022] By adopting the above technical solution, the control components use a scissor lift mechanism and a drive mechanism. The scissor lift mechanism has a stable structure and can smoothly control the lifting and lowering of the baffle. The drive mechanism provides power to the scissor lift mechanism to realize the automated control of the baffle.

[0023] Optionally, the scissor lift mechanism includes a first link and a second link hinged to each other, which are disposed between the base shell and the baffle. One end of the first link is hinged to the base shell, and the other end is slidably disposed on the baffle via a first rotating shaft. One end of the second link is hinged to the baffle, and the other end is slidably disposed on the base shell via a second rotating shaft.

[0024] By adopting the above technical solution, the scissor lift mechanism is set between the base shell and the baffle. By controlling the angle changes of the first link and the second link, the lifting and lowering of the baffle can be controlled, making the lifting and lowering process of the baffle more stable and smooth, and accurately controlling the moving distance and position of the baffle.

[0025] Optionally, the driving mechanism includes a nut seat disposed on the second rotating shaft, a screw rotatably connected to the inner wall of the base shell, the screw passing through the nut seat and threadedly connected to the nut seat, and a drive motor for driving the screw to rotate is disposed on the base shell.

[0026] By adopting the above technical solution, the nut seat in the drive mechanism is connected to the second rotating shaft, the screw is threadedly connected to the nut seat and driven to rotate by the motor, and the rotation of the screw drives the nut seat to move, thereby realizing the lifting of the scissor lift mechanism. This drive method has a simple structure, smooth transmission and is easy to control.

[0027] Optionally, the drive assembly is linked with the drive mechanism; the heat insulation plate is hinged to the base shell, and the drive assembly includes a push rod hinged to the heat insulation plate, with a slide block hinged to the end of the push rod away from the heat insulation plate, and the slide block is connected to the second rotating shaft.

[0028] By adopting the above technical solution, the drive component and the drive mechanism are linked, which simplifies the control structure. The heat insulation plate is hinged to the base shell, one end of the push rod is hinged to the heat insulation plate, and the other end of the push rod is hinged to the slide block, which is connected to the second rotating shaft. The push rod can be moved by the action of the drive mechanism, thereby realizing the opening and closing of the heat insulation plate and realizing the automatic switching of ventilation and heat insulation functions.

[0029] Optionally, the slide is provided with a buckle. When the heat insulation plate is closed, the buckle presses the heat insulation plate against the base shell. The end of the push rod away from the base shell is provided with a limiting shaft. The heat insulation plate is provided with an oblong hole for the limiting shaft to pass through. When the second rotating shaft moves, it can drive the slide and the heat insulation plate to move relative to each other, and drive the buckle to disengage from the heat insulation plate.

[0030] By adopting the above technical solution, the movable buckle on the slide can hold the heat insulation plate onto the base shell when the heat insulation plate is closed, thereby enhancing the sealing performance when the heat insulation plate is closed.

[0031] In summary, this application includes at least one of the following beneficial technical effects: 1. When a fire breaks out inside the target device, the heat insulation board can quickly block the ventilation channel under the action of the drive component, effectively mitigating the impact of high temperature on the control component, fan and related electrical components, and preventing the exhaust fan from failing quickly; after the fire is extinguished, the exhaust fan can still be turned on normally to quickly discharge the toxic gases, combustible gases and high-temperature gases after combustion, reducing safety hazards. 2. The water baffle plate surrounds the control components and ventilation channels, effectively preventing external moisture from entering the exhaust fan and avoiding damage to electrical components and control components, thus improving the reliability of the equipment; 3. The fan is a centrifugal fan and is fixedly connected to the baffle plate. It moves with the baffle plate and can direct the airflow perpendicular to the baffle plate in a direction parallel to the baffle plate, which improves the exhaust efficiency. At the same time, the inclined guide plate can guide the airflow and make the airflow pass through the ventilation channel more smoothly. 4. A drive motor is used to rotate the screw, which in turn drives the scissor lift mechanism and controls the movement of the baffle. The screw and nut have a self-locking effect. When the fan baffle is closed, even if the drive motor and related electrical components are damaged at high temperatures, the self-locking effect of the screw and nut can still ensure the baffle seals the ventilation channel, reducing the spread of flames. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0033] Figure 2 This is a structural schematic diagram illustrating the open state of the heat insulation panel in an embodiment of this application.

[0034] Figure 3 This is a cross-sectional view of an embodiment of this application used to illustrate the closed state of the heat insulation panel.

[0035] Figure 4 This is a cross-sectional view of an embodiment of this application used to illustrate the open state of the heat insulation panel.

[0036] Figure 5 yes Figure 4 An enlarged schematic diagram of part A in the middle.

[0037] Figure 6 This is a structural schematic diagram illustrating the position of the scissor lift mechanism in an embodiment of this application.

[0038] Figure 7 This is a structural schematic diagram illustrating the scissor lift mechanism and drive mechanism in the embodiments of this application.

[0039] Figure 8 This is a schematic diagram illustrating the structure of the driving component in an embodiment of this application.

[0040] Figure 9 This is a schematic diagram illustrating the structure of the buckle and the slot in an embodiment of this application.

[0041] Explanation of reference numerals in the attached drawings: 10. Base shell; 11. Outer frame; 12. Base plate; 13. Air duct; 14. Ventilation channel; 15. Receiving cavity; 16. Baffle; 17. Inclined guide plate; 18. Fan; 19. Heat insulation plate; 20. Water baffle; 21. Sealing strip; 22. Elastic part; 23. Cavity; 24. Annular groove; 30. Scissor lift mechanism; 31. First connecting rod; 32. Second connecting rod; 33. First rotating shaft; 34. Second rotating shaft; 35. First guide post; 36. First slider; 37. Second guide post; 38. Second slider; 40. Drive mechanism; 41. Nut seat; 42. Screw; 43. Drive motor; 50. Drive assembly; 51. Push rod; 52. Slide seat; 53. Buckle; 54. Slot; 55. Limiting shaft; 56. Waist-shaped hole. Detailed Implementation

[0042] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail.

[0043] This application discloses a top-mounted exhaust fan. For example... Figure 1 and Figure 2 The top-mounted exhaust fan includes a base shell 10 for installation on the top wall of the target equipment. In this embodiment, the base shell 10 is made of high-strength aluminum alloy and is rectangular in shape. A ventilation channel 14 is provided on the base shell 10, which connects the inside and outside of the target equipment to facilitate airflow.

[0044] like Figure 3 and Figure 4The base shell 10 includes an outer frame 11 and a base plate 12. The base plate 12 is fixedly connected to the side of the outer frame 11 facing away from the baffle 16. The outer wall of the base shell 10 is covered with a layer of fire-resistant insulation board (not shown in the figure). Ventilation openings are provided on the base plate 12, and air guide ducts 13 are installed on the base plate 12 corresponding to the ventilation openings, with the air guide ducts 13 extending towards the interior of the outer frame 11. Both ends of the air guide duct 13 are open, and the inner wall of the air guide duct 13 is a ventilation channel 14. The outer wall of the air guide duct 13 and the inner wall of the outer frame 11 form a receiving cavity 15, which is used to install electrical components such as actuators, controllers, and circuit boards. The receiving cavity 15 is open on the side facing the baffle 16.

[0045] To reduce the risk of water ingress into the mounting cavity and damage to electrical components, a separate waterproof mounting box needs to be installed inside the mounting cavity. The electrical components are installed inside this waterproof mounting box, and the wiring harness is connected via a gland at the point where it passes through the waterproof mounting box to improve waterproof performance.

[0046] In other embodiments, the waterproof mounting box can also be installed outside the mounting cavity to protect electrical components.

[0047] A baffle 16 is movably disposed above the base shell 10. In this embodiment, the surface of the baffle 16 is perpendicular to the axial direction of the ventilation channel 14. A control component for controlling the movement of the baffle 16 is disposed on the base shell 10. The control component is installed in the receiving cavity 15. The control component controls the movement of the baffle 16 to control the opening and closing of the ventilation channel 14.

[0048] An inclined guide plate 17 is provided at the outer edge of the baffle 16. The side of the inclined guide plate 17 away from the baffle 16 is inclined towards the base shell 10. It is used to guide rainwater or debris falling on the baffle 16, reduce the retention of rainwater or debris on the upper surface of the base shell 10, and at the same time, it can also reduce the lateral entry of rainwater or debris into the ventilation channel 14 and the receiving cavity 15 of the base shell 10.

[0049] When the baffle 16 is closed, the ventilation channel 14 is sealed; when the baffle 16 is open, the ventilation channel 14 is open. The baffle 16 is located directly above the receiving cavity 15 and the ventilation channel 14, and the projection of the baffle 16 and the inclined guide plate 17 on the base shell 10 covers the entire base shell 10, reducing the possibility of rainwater and foreign objects entering the receiving cavity 15 and the ventilation channel 14.

[0050] A fan 18 is provided on the base shell 10 or the baffle 16, and the fan 18 is used to drive air to circulate through the ventilation channel 14. In this embodiment, the fan 18 is fixedly connected to the side of the baffle 16 facing the base shell 10, and the centrifugal fan 18 can move with the movement of the baffle 16.

[0051] The fan 18 is a centrifugal fan 18. The centrifugal fan 18 is used to direct the airflow parallel to the ventilation channel 14 in a direction parallel to the lower surface of the baffle 16, thereby reducing the impact of the baffle 16 on the flow rate of the fan 18.

[0052] like Figure 4 and Figure 5 A water baffle 20 is provided on the side of the base shell 10 facing the baffle 16. The baffle 16 extends in the direction of the baffle 16. The receiving cavity 15 and the ventilation channel 14 on the base shell 10 are both located within the area enclosed by the water baffle 20, which is used to reduce the occurrence of rainwater entering the receiving cavity 15 and the ventilation channel 14.

[0053] A sealing strip 21 is also provided on the side of the base shell 10 facing the baffle 16. The sealing strip 21 is provided along the baffle plate 20 and extends to the side of the baffle plate 20 facing the baffle 16. The sealing strip 21 is provided with annular grooves 24 for the baffle plate 20 to be inserted into, so as to facilitate the positioning and installation of the sealing strip 21 on the baffle plate 20.

[0054] An elastic part 22 is provided on the side of the sealing strip 21 facing the baffle plate 20. A cavity 23 is provided inside the elastic part 22 of the baffle plate 20 to increase the elastic deformation of the elastic part 22. During the closing process of the baffle plate 16, the baffle plate 16 moves towards the base shell 10, gradually approaching and pressing the elastic part 22 onto the baffle plate 20. The sealing strip 21 between the baffle plate 16 and the baffle plate 20 achieves a seal, forming a water barrier between the inner and outer sides of the baffle plate 16, reducing the possibility of water leakage or dust entry into the fan 18 when the baffle plate 16 is closed.

[0055] like Figure 6 and Figure 7 The control component can be a cylinder, an electric push rod 51 or other drive device. The drive device can directly push the baffle 16 to rise or fall, or cooperate with linkage mechanism such as linkage mechanism and lead screw and nut mechanism to achieve the effect of controlling the rise and fall of the baffle 16.

[0056] In this embodiment, the control component includes a scissor lift mechanism 30 disposed within the receiving cavity 15, and a drive mechanism 40 for driving the scissor lift mechanism 30. The scissor lift mechanism 30 is connected between the baffle 16 and the base shell 10. The drive mechanism 40 drives the scissor lift mechanism 30 to operate, thereby controlling the lifting and lowering of the baffle 16. One or more scissor lift mechanisms 30 are disposed within the receiving cavity 15. Specifically, two scissor lift mechanisms 30 are disposed within the receiving cavity 15, and the two scissor lift mechanisms 30 are symmetrically arranged about the air guide duct 13, which helps to improve the support effect of the scissor lift mechanism 30 on the baffle 16.

[0057] like Figure 7 and Figure 8The scissor lift mechanism 30 includes a first connecting rod 31 and a second connecting rod 32 disposed between the base plate 12 and the baffle 16, and the first connecting rod 31 and the second connecting rod 32 are hinged to each other. Each end of the first connecting rod 31 has a first rotating shaft 33, one end of which is hinged to the base plate 12. A first guide post 35 is fixedly connected to the lower surface of the baffle 16, and a first slider 36 is slidably disposed on the first guide post 35. The other end of the first connecting rod 31 has a first rotating shaft 33 rotatably connected to the first slider 36. Each end of the second connecting rod 32 has a second rotating shaft 34, one end of which is hinged to the baffle 16. A second guide post 37 is disposed on the base plate 12, and a second slider 38 is slidably disposed on the second guide post 37. The other end of the second connecting rod 32 has a first rotating shaft 33 rotatably connected to the second slider 38. The axial distance between the first rotating shafts 33 at both ends of the first link 31 is the same as the axial distance between the second rotating shafts 34 at both ends of the second link 32. The middle positions of the first rotating shafts 33 at both ends of the first link 31 and the middle positions of the second rotating shafts 34 at both ends of the second link 32 are hinged to each other.

[0058] As the second slider 38 slides on the corresponding second guide post 37, it can drive the angle between the first link 31 and the second link 32 to change, control the lifting and lowering of the first guide post 35, and thus realize the lifting and lowering control of the baffle 16.

[0059] The drive mechanism 40 includes a nut seat 41, two second rotating shafts 34 connected by a connecting plate, and the nut seat 41 fixedly connected to the connecting plate, with the axial direction of the nut seat 41 perpendicular to the axial direction of the second rotating shafts 34. A screw 42 is rotatably connected to the bottom plate 12 of the base shell 10, passing through the nut seat 41 and threadedly connected to it. The operator can control the rotation of the screw 42, thereby controlling the second slider 38 to slide on the corresponding second guide post 37. A drive motor 43 for controlling the rotation of the screw 42 is mounted on the bottom plate 12 of the base shell 10. The drive motor 43 is a servo motor, and its output shaft is connected to the screw 42 via a coupling, enabling it to drive the screw 42 to rotate. The rotation of the screw 42 drives the nut seat 41 and the connecting plate to push the second slider 38 to slide on the second guide post 37, thereby driving the two scissor-type lifting mechanisms 30 to rise and fall synchronously, thus stably driving the baffle 16 to rise and fall.

[0060] like Figure 7 , Figure 8 as well as Figure 9 The fire-resistant insulation board on the side wall of the base shell 10 has fireproof and heat insulation effects. A fireproof heat insulation board 19 is movably installed on the side of the base shell 10 away from the baffle 16. The side of the heat insulation board 19 facing the base shell 10 can also be a fire-resistant insulation board (not shown in the figure). The heat insulation board 19 is used to cover the lower end face of the base shell 10 and the ventilation channel 14.

[0061] A drive assembly 50 is provided on the base shell 10 for controlling the movement of the heat insulation panel 19. The drive assembly 50 controls the heat insulation panel 19 to cover or open the ventilation channel 14. The drive assembly 50 is linked with the control assembly to drive the heat insulation panel 19 to move. When the control assembly drives the baffle 16 to open the ventilation channel 14, the heat insulation panel 19 moves under the linkage of the drive assembly 50, and removes the obstruction effect on the ventilation channel 14, facilitating ventilation and cooling. When the control assembly drives the baffle 16 to close the ventilation channel 14, the heat insulation panel 19 moves under the linkage of the drive assembly 50, and covers the ventilation channel 14 and the lower end surface of the base shell 10, which helps to improve the fireproof isolation effect of the fan 18.

[0062] The heat insulation plate 19 is hinged to the base shell 10 via a hinge. The drive assembly 50 includes a push rod 51 hinged to the heat insulation plate 19, and a slide block 52 is hinged to one end of the push rod 51 away from the heat insulation plate 19. The slide block 52 is slidably disposed on the base shell 10 and is fixedly connected to the second slider 38, moving synchronously with the corresponding second slider 38.

[0063] To improve the stability of the heat insulation plate 19 in the closed state, a buckle 53 is fixedly connected to the slide 52. The buckle 53 is an elastic buckle, specifically made of elastic material, and it pops out in the normal state. The heat insulation plate 19 is provided with a slot 54 for the buckle 53 to pass through. When the heat insulation plate 19 is closed, the buckle 53 engages with the wall of the slot 54 under its own elastic force, so that the heat insulation plate 19 remains closed.

[0064] A limiting shaft 55 is provided at one end of the push rod 51 facing the heat insulation plate 19. The heat insulation plate 19 is provided with an oblong hole 56 for the limiting shaft 55 to pass through, and the length direction of the oblong hole 56 is perpendicular to the flipping axis of the heat insulation plate 19. The limiting shaft 55 can move closer to or away from the hinge direction within the oblong hole 56.

[0065] When the heat insulation plate 19 is in the open state, the buckle 53 remains in the popped-out state under its own elastic force, and the heat insulation plate 19 and the push rod 51 remain in the drooping state under their own gravity, so that the limiting shaft 55 moves to the end of the waist-shaped hole 56 near the hinge.

[0066] During the closing process of the heat insulation plate 19, the drive motor 43 drives the screw 42 to rotate, which in turn drives the nut seat 41 and the slide 52 to move. Under the linkage of the push rod 51, the heat insulation plate 19 can be rotated towards the base shell 10. During this process, the slot 54 on the heat insulation plate 19 gradually approaches the buckle 53 and can push the buckle 53. When the heat insulation plate 19 is fully closed, the buckle 53 extends under its own elastic force and engages with the slot 54, so that the heat insulation plate 19 maintains a stable closed state. As the heat insulation plate 19 gradually moves towards the base shell 10 until the heat insulation plate 19 is fully closed, the limiting shaft 55 gradually moves within the oblong hole 56 to the end away from the hinge.

[0067] When the baffle 16 needs to be opened, the drive motor 43 drives the screw 42 to rotate in the opposite direction, and drives the nut seat 41 and the slide 52 to move in the opposite direction. During this process, the slide 52 drives the buckle 53 to gradually move away from the slot 54. At the same time, the limiting shaft 55 moves towards the hinge in the oblong hole 56. When the buckle 53 disengages from the groove wall of the slot 54, the buckle 53 releases its limiting effect on the heat insulation plate 19. The heat insulation plate 19 slides down under the action of gravity, causing the limiting shaft 55 to move in the oblong hole 56 to the end closer to the hinge. The slide 52 continues to move with the nut seat 41, thereby driving the heat insulation plate 19 to gradually open.

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An overhead exhaust fan characterized by, The utility model relates to a kind of fire-resistant stove, including: Base shell (10), outer wall is provided with refractory insulation board; Ventilation channel (14) is provided on the base shell (10), for air circulation; Baffle (16) is movably provided on the base shell (10), the baffle (16) moves for controlling the opening or closure of the ventilation channel (14); Control assembly is provided between the baffle (16) and the base shell (10), for controlling the baffle (16) activity; Fan (18), the fan (18) is installed on the base shell (10) or the baffle (16), and is used to drive airflow through the ventilation channel (14); The side of the base shell (10) away from the baffle (16) movably provided with heat insulation plate (19), the heat insulation plate (19) is used to shield the ventilation channel (14), and alleviate the control assembly, fan and related electrical elements are influenced by high temperature, the base shell (10) is provided with drive assembly (50) for controlling the heat insulation plate (19) movement.

2. A ceiling exhaust fan as claimed in claim 1, wherein: The side of the baffle (16) away from the baffle (16) is inclined towards the base shell (10) direction, for guiding flow; The projection of the baffle (16) and the inclined guide plate (17) on the base shell (10) always covers the control assembly and ventilation channel (14) in the state that the baffle (16) opens or closes the ventilation channel (14).

3. A ceiling exhaust fan as defined in claim 1, wherein: The fan (18) is fixedly connected to the baffle (16), and moves along with the baffle (16); The fan (18) is centrifugal fan (18), for the airflow perpendicular to the baffle (16) is exported in the direction parallel to the baffle (16).

4. A ceiling exhaust fan as defined in claim 1, wherein: The side of the base shell (10) towards the baffle (16) is provided with a circle of water baffle (20), and the control assembly and ventilation channel (14) are located in the range surrounded by the water baffle (20).

5. A ceiling exhaust fan as claimed in claim 4, wherein: The side of the base shell (10) towards the baffle (16) is provided with a circle of sealing strip (21) for abutting the baffle (16), the sealing strip (21) is arranged around the contour of the water baffle (20), and the side of the sealing strip (21) is provided with annular groove (24) for inserting the baffle (16).

6. A ceiling exhaust fan as claimed in claim 5, wherein: The side of the sealing strip (21) towards the water baffle (20) is elastic part (22), the cavity (23) is arranged in the elastic part (22), so as to increase the elastic deformation amount, so as to improve the sealing effect of the elastic part (22) and the inner wall of the water baffle (20).

7. A ceiling exhaust fan as defined in claim 1, wherein: The side of the base shell (10) away from the baffle (16) is fixedly connected with air guide cylinder (13), the air guide cylinder (13) extends into the base shell (10), and forms containing cavity (15) for accommodating electrical elements and the control assembly with the inner wall of the base shell (10).

8. A ceiling exhaust fan as defined in claim 1, wherein: The control assembly includes scissor type lifting mechanism (30) arranged between the base shell (10) and the baffle (16), and drive mechanism (40) for driving the scissor type lifting mechanism (30) to work.

9. A plenum exhaust fan as claimed in claim 8, wherein: The scissor lifting mechanism (30) comprises a first connecting rod (31) and a second connecting rod (32) which are hingedly arranged between the base shell (10) and the baffle (16), one end of the first connecting rod (31) is hingedly arranged on the base shell (10), the other end is slidably arranged on the baffle (16) through a first rotating shaft (33), one end of the second connecting rod (32) is hingedly arranged on the baffle (16), the other end is slidably arranged on the base shell (10) through a second rotating shaft (34).

10. A ceiling exhaust fan as claimed in claim 9, wherein: The driving mechanism (40) comprises a nut seat (41) arranged on the second rotating shaft (34), a screw rod (42) is rotatably connected to the inner wall of the base shell (10), the screw rod (42) penetrates through the nut seat (41) and is threadedly connected with the nut seat (41), and a driving motor (43) for driving the screw rod (42) to rotate is arranged on the base shell (10).

11. A ceiling exhaust fan as defined in claim 9, wherein: The driving assembly (50) is linked with the driving mechanism (40); the heat insulation plate (19) is hingedly arranged on the base shell (10), the driving assembly (50) comprises a push rod (51) hingedly arranged on the heat insulation plate (19), one end of the push rod (51) away from the heat insulation plate (19) is hingedly connected with a sliding seat (52), and the sliding seat (52) is connected to the second rotating shaft (34).

12. A ceiling exhaust fan as claimed in claim 11, wherein: The sliding seat (52) is provided with a buckle (53), the buckle (53) abuts the heat insulation plate (19) against the base shell (10) in the closed state of the heat insulation plate (19); one end of the push rod (51) away from the base shell (10) is provided with a limiting shaft (55), the heat insulation plate (19) is provided with a waist-shaped hole (56) for the limiting shaft (55) to pass through, and the second rotating shaft (34) can drive the sliding seat (52) and the heat insulation plate (19) to move relatively and drive the buckle (53) to be separated from the heat insulation plate (19) when moving.

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