An over-head ventilation device

Abstract

The application relates to a top ventilation device and relates to the field of equipment ventilation technology. The device comprises a base shell, a ventilation channel arranged on the base shell and used for air circulation, a baffle movably arranged on the base shell and used for controlling opening or closing of the ventilation channel, and a control assembly arranged between the baffle and the base shell and used for controlling movement of the baffle. In the state of opening or closing of the ventilation channel by the baffle, the projection of the baffle on the base shell always covers the control assembly and the ventilation channel. The application can reduce direct entry of external sundries, rainwater and the like into a target device and relieve the influence of external factors on internal equipment of the target device.

Description

Technical Field

[0001] This application relates to the field of equipment ventilation technology, and in particular to a top-mounted ventilation device. 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 electronic components and potentially leading to equipment malfunctions or damage. Therefore, maintaining a stable internal environment and ensuring long-term, reliable operation is crucial for timely and effective ventilation and heat dissipation.

[0003] Currently, traditional ventilation systems mostly achieve ventilation by installing fans on the side or top walls of the target equipment. However, in outdoor applications, rainwater can easily enter the equipment through the fans during rainy weather, causing short circuits, corrosion, and other damage to the internal electronic components, severely affecting the normal operation and lifespan of the equipment. To solve this problem, a water shield is usually installed on the outside of the fan. Utility Model Content

[0004] In order to reduce the direct entry of external debris and rainwater into the target equipment and affect the normal operation of the internal equipment, this application provides a top-mounted ventilation device.

[0005] The top-mounted ventilation device provided in this application adopts the following technical solution: A top-mounted ventilation device, comprising: Base shell; 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; When the baffle is open or closed, the projection of the baffle on the base shell always covers the control component and the ventilation channel.

[0006] By adopting the above technical solution, the baffle moves to control the opening or closing of the ventilation channel, realizing flexible adjustment of the ventilation function; and when the baffle opens or closes the ventilation channel, its projection on the base shell always covers the control components and the ventilation channel, which can protect the control components and the ventilation channel and reduce the direct entry of external debris, rainwater and other factors that affect their normal operation.

[0007] 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.

[0008] By adopting the above technical solution, the inclined guide plate set on the periphery of the baffle is inclined towards the base shell on the side away from the baffle, which can guide the airflow around the baffle, so that the airflow flows in a predetermined direction, optimizes the ventilation effect, reduces airflow turbulence, and improves ventilation efficiency.

[0009] Optionally, a fan is installed on the baffle.

[0010] By adopting the above technical solution and installing a fan on the baffle, the ventilation capacity can be actively enhanced, the air circulation speed in the ventilation channel can be accelerated, the ventilation efficiency can be improved, and the application of scenarios with higher requirements for ventilation volume can be met.

[0011] Optionally, the fan is a centrifugal fan, used to direct the airflow passing through the ventilation channel in a direction parallel to the baffle.

[0012] By adopting the above technical solution and using a centrifugal fan, the airflow passing through the ventilation channel can be directed in a direction parallel to the baffle, making the airflow guidance more precise. The airflow direction can be specifically designed according to actual needs to meet the ventilation requirements of different spatial layouts and usage scenarios, thereby improving the pertinence and effectiveness of ventilation.

[0013] Optionally, the baffle is provided with a flow guiding channel, which is located at the air inlet of the fan, extends toward the ventilation channel, and communicates with the ventilation channel.

[0014] By adopting the above technical solution, a guide channel is set on the baffle and located at the air inlet of the fan and connected to the ventilation channel. This can guide the airflow in the ventilation channel to enter the air inlet of the fan more smoothly, reduce the energy loss of the airflow in the process of entering the fan, improve the air intake efficiency of the fan, and thus improve the performance of the entire ventilation device.

[0015] Optionally, the baffle is covered with a cover, the cover covers the fan, the flow channel is fixedly connected to the cover and communicates with the air inlet of the fan, the cover is provided with an exhaust port, the air outlet of the fan is connected to the exhaust port, and the exhaust port is arranged towards the gap between the baffle and the base shell.

[0016] By adopting the above technical solution, a cover is installed on the baffle and covers the fan. The air guide channel is fixedly connected to the cover and faces and connects to the air inlet of the fan. An exhaust port is set on the cover and connects to the air outlet of the fan. The exhaust port on the cover faces the gap between the baffle and the base. This structure can protect the fan and prevent external objects from damaging the fan. At the same time, it can rationally plan the airflow in and out paths to make the airflow flow in an orderly manner.

[0017] Optionally, the exhaust port is located on one side of the housing, and the inner wall of the housing is used to guide the airflow from the fan outlet to the exhaust port, so as to increase the air pressure at the exhaust port.

[0018] By adopting the above technical solution, the exhaust port is located on one side of the casing, and the inner wall of the casing guides the airflow of the fan exhaust port to the exhaust port, which can increase the air pressure of the exhaust port, make the airflow more powerful, enhance the exhaust capacity of the ventilation device, and is suitable for scenarios that require greater exhaust force.

[0019] Optionally, the flow guiding channel and the ventilation channel are nested together.

[0020] By adopting the above technical solution, the airflow channel and the ventilation channel are interlocked. This structural design is compact and achieves reasonable airflow guidance and circulation within a limited space, saving space and improving the overall structural strength and stability of the ventilation device.

[0021] Optionally, when the baffle is open or closed, the flow guide channel remains inserted within the ventilation channel.

[0022] By adopting the above technical solution, when the baffle is open, the guide channel passes through the ventilation channel, realizing gas exchange between the inside and outside of the target equipment, and reducing the situation where the airflow only circulates in the base shell, which is conducive to improving the ventilation and air exchange effect of the device.

[0023] Optionally, a water-blocking plate extends from one side of the base shell toward the baffle, and the control components and ventilation channels are both located within the area enclosed by the water-blocking plate.

[0024] By adopting the above technical solution, the water baffle extending from the base shell towards the baffle side encloses the control components and ventilation channels within its range, which can effectively block external rainwater and other liquids, prevent liquids from entering the control components and ventilation channels, avoid problems such as short circuits and damage caused by liquid intrusion, and improve the waterproof performance and reliability of the ventilation device.

[0025] Optionally, a sealing gasket is provided between the base shell and the baffle to form a seal between the base shell and the baffle when the baffle is closed, and to enclose the control components and ventilation channels within the baffle.

[0026] By adopting the above technical solution, the sealing gasket set between the base shell and the baffle can form a seal between the base shell and the baffle when the baffle is closed, thus enclosing the control components and ventilation channels inside the baffle, further enhancing the waterproof and dustproof effect, effectively protecting the internal components, and extending the service life of the ventilation device.

[0027] Optionally, an air guide tube is fixedly connected to the side of the base shell away from the baffle. The inner wall of the air guide tube forms a ventilation channel. The air guide tube extends into the base shell and forms a mounting groove with the inner wall of the base shell for accommodating electrical components and the control assembly.

[0028] By adopting the above technical solution, the air guide tube fixedly connected to the side of the base shell away from the baffle extends into the base shell and forms an installation groove with the inner wall, which can be used to accommodate electrical components and control components, and play a protective role for electrical components and control components. At the same time, it makes reasonable use of space, making the internal structure layout of the ventilation device more compact and orderly, and facilitating installation and maintenance.

[0029] Optionally, the control component includes a scissor lift mechanism for connecting the base shell and the baffle, and a drive mechanism for driving the scissor lift mechanism, the drive mechanism being mounted on the base shell.

[0030] By adopting the above technical solution, the control component uses a scissor lift mechanism to connect the base shell and the baffle, and is driven by a drive mechanism. The scissor lift mechanism has the characteristics of structural stability and strong load-bearing capacity, which can ensure the stability of the baffle during movement and realize reliable control of the opening and closing of the ventilation channel.

[0031] Optionally, the scissor lift mechanism includes a first link and a second link disposed between the baffle and the base shell. The first link and the second link are hinged to each other. One end of the first link is hinged to the bottom wall of the base shell, and the other end of the first link is rotatably and slidably disposed on the baffle. One end of the second link is hinged to the baffle, and the other end of the second link is rotatably and slidably disposed on the bottom wall of the base shell. The drive mechanism is used to push the second link to flip.

[0032] By adopting the above technical solution, the drive mechanism controls the second link to flip, causing the angle between the first link and the second link to change, thereby controlling the lifting and lowering of the baffle.

[0033] Optionally, two scissor lift mechanisms are provided between the baffle and the base shell, and the two scissor lift mechanisms are symmetrically arranged about the ventilation channel. The drive mechanism includes an electric push rod fixedly connected to the bottom wall of the base shell, and the moving part of the electric push rod is connected to the second connecting rod.

[0034] By adopting the above technical solution and setting two symmetrical scissor-type lifting mechanisms about the ventilation channel, the force on the baffle can be more even during the lifting process, further improving the stability of the baffle movement; by using an electric push rod as the driving mechanism, the moving part of which is connected to the second link, the flipping of the second link can be precisely controlled, thereby precisely controlling the lifting height of the baffle and realizing precise adjustment of the opening degree of the ventilation channel.

[0035] In summary, this application includes at least one of the following beneficial technical effects: 1. The baffle moves to control the opening or closing of the ventilation channel, enabling flexible adjustment of the ventilation function; and when the baffle opens or closes the ventilation channel, its projection on the base shell always covers the control components and the ventilation channel, which can protect the control components and the ventilation channel, reduce the direct entry of external debris, rainwater, etc. into the base shell and the target equipment, and ensure the normal operation of the equipment. 2. The fan, guide channel, inclined guide plate and cover installed on the baffle can reasonably guide the airflow, improve ventilation efficiency and enhance ventilation effect; 3. The water baffle and sealing gasket can effectively prevent rainwater, dust and other substances from entering the base shell and the interior of the target equipment, protect the control components and ventilation channels, and improve the reliability and service life of the device; 4. The two symmetrically arranged scissor lift mechanisms and electric push rod drive can ensure the smoothness of the baffle lifting and improve the operational stability of the device. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0037] Figure 2 This is an exploded view of the mounting slot, fan, and casing used in the embodiments of this application.

[0038] Figure 3 This is a schematic diagram illustrating the structure of the fan and the casing in an embodiment of this application.

[0039] Figure 4 This is a cross-sectional view of an embodiment of this application used to illustrate the closed state of the baffle.

[0040] Figure 5 This is a cross-sectional view of an embodiment of this application used to illustrate the open state of the baffle.

[0041] Figure 6 This is a structural schematic diagram illustrating the scissor lift mechanism and drive mechanism in the embodiments of this application.

[0042] Explanation of reference numerals in the attached drawings: 10. Base shell; 11. Outer frame; 12. Base plate; 13. Ventilation opening; 14. Air guide tube; 15. Ventilation channel; 16. Mounting groove; 17. Baffle; 18. Inclined guide plate; 20. Fan; 21. Cover; 22. Air guide channel; 23. Exhaust outlet; 24. Water baffle; 26. Mounting port; 27. Sealing plate; 31. Scissor lift mechanism; 32. First connecting rod; 33. First rotating shaft; 34. Second connecting rod; 35. Second rotating shaft; 38. Drive mechanism; 39. Electric push rod. Detailed Implementation

[0043] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0044] This application discloses a top-mounted ventilation device. For example... Figure 1 and Figure 2 The top-mounted ventilation device includes a base shell 10 for installation on the top wall of the target equipment, which can be an energy storage container, a power distribution cabinet, or a workshop prone to dust generation. In this embodiment, the target equipment is an energy storage container. The base shell 10 is clamped and installed on the top wall of the energy storage container, and is made of high-strength aluminum alloy with a cuboid shape. A ventilation channel 15 is provided on the base shell 10, which connects the inside and outside of the target equipment to facilitate airflow.

[0045] A baffle 17 is movably disposed above the base shell 10 to cover the ventilation channel 15. A control component is connected between the base shell 10 and the baffle 17 to control the movement of the baffle 17, thereby controlling the opening and closing of the ventilation channel 15. A mounting groove 16 is provided at the upper end of the base shell 10 to accommodate the control component and related electrical components. When the baffle 17 is closed, it seals the ventilation channel 15 and the mounting groove 16. When the baffle 17 is open, it enables the ventilation of the ventilation channel 15. In this state, the projection of the baffle 17 onto the base shell 10 always covers the mounting groove 16 and the ventilation channel 15, reducing the entry of rainwater and foreign objects into the ventilation channel 15 and the mounting groove 16.

[0046] To alleviate water accumulation above the baffle 17 and reduce the lateral entry of rainwater or other debris into the mounting groove 16 or ventilation channel 15, a ring of inclined guide plates 18 is provided at the outer edge of the baffle 17. The side of the inclined guide plates 18 away from the baffle 17 is inclined towards the base shell 10 to guide rainwater or debris falling on the baffle 17, increase the projected area of ​​the baffle 17 on the base shell 10, and improve the coverage effect of the baffle 17 on the mounting groove 16 and ventilation channel 15.

[0047] The base shell 10 includes an outer frame 11 and a base plate 12. The outer frame 11 has openings at both ends along the vertical direction, and the base plate 12 is fixedly connected to the openings at the bottom of the outer frame 11. The base plate 12 has ventilation openings 13, and a vertically arranged air guide duct 14 is installed on the base plate 12 corresponding to the ventilation openings 13, extending towards the interior of the outer frame 11. The air guide duct 14 has openings at both ends along the axial direction, and its inner wall forms a ventilation channel 15. The outer wall of the air guide duct 14 and the inner wall of the outer frame 11 form a mounting groove 16, with the groove opening facing upwards. The mounting groove 16 is used to install control components or controllers, circuit boards, and other electrical components.

[0048] To reduce the risk of water ingress into the mounting slot 16 and damage to electrical components, an independent waterproof mounting box needs to be installed on the inner wall of the outer frame 11 inside the mounting slot 16. The electrical components are installed inside the waterproof mounting box, and the wiring harness is connected via a gland (not shown in the figure) at the point where it passes through the waterproof mounting box to improve waterproof performance.

[0049] In other embodiments, the waterproof mounting box can also be installed outside the mounting slot 16 to protect electrical components.

[0050] like Figure 2 and Figure 3 To improve ventilation, a fan 20 is provided on the base shell 10 or the baffle 17. The fan 20 is used to drive air to circulate through the ventilation channel 15. In this embodiment, the fan 20 is fixedly connected to the side of the baffle 17 facing the base shell 10, and the fan 20 can move with the movement of the baffle 17.

[0051] The fan 20 is a centrifugal fan. The function of the centrifugal fan 20 is to direct the airflow parallel to the ventilation channel 15 in a direction parallel to the lower surface of the baffle 17, thereby reducing the impact of the baffle 17 on the flow rate of the fan 20.

[0052] like Figure 3 , Figure 4 as well as Figure 5 A cover 21 is provided on the side of the baffle 17 facing the base plate 12. The cover 21 covers the fan 20, and a cylindrical guide channel 22 is installed at the end of the cover 21 facing the ventilation channel 15. One end of the guide channel 22 is connected to the cover 21 and is positioned opposite to the air inlet of the fan 20. The other end of the guide channel 22 extends toward the ventilation channel 15, and the ventilation channel 15 and the guide channel 22 are nested together. In this embodiment, the guide channel 22 extends into the ventilation channel 15, and the guide channel 22 remains extended into the ventilation channel 15 throughout the movement of the baffle 17 driven by the control component.

[0053] The housing 21 has an exhaust port 23 located at the outlet of the fan 20. When the control component drives the baffle 17 to open, the exhaust port 23 is directly opposite the opening gap between the baffle 17 and the base shell 10. The exhaust port 23 is located on one side of the housing 21, and the inner wall of the housing 21 is used to guide the airflow from the outlet of the fan 20 to the exhaust port 23. This increases the exhaust air pressure at the exhaust port 23 when the fan 20 is driven, reducing the entry of rainwater and foreign objects into the housing 21. In addition, by increasing the exhaust air pressure at the exhaust port 23, the influence of external airflow on the exhaust effect of the exhaust port 23 can also be reduced.

[0054] To improve the waterproofing effect of the baffle 17 when it is open, a water baffle 24 is provided on the side of the base shell 10 facing the baffle 17. The water baffle 24 extends towards the baffle 17. The mounting groove 16 and ventilation channel 15 on the base shell 10 are both located within the area enclosed by the water baffle 24, which is used to reduce the possibility of rainwater or debris entering the mounting groove 16 and ventilation channel 15.

[0055] To improve the sealing effect of the baffle 17 when it is closed, a sealing strip (not shown in the figure) is also provided on the side of the base shell 10 facing the baffle 17. During the closing process, the baffle 17 moves towards the base shell 10, and the sealing strip gradually approaches and presses against the water baffle 24. The sealing is achieved through the sealing strip between the baffle 17 and the water baffle 24, forming a water barrier between the inner and outer sides of the baffle 17, reducing the possibility of water seepage and leakage when the baffle 17 is closed.

[0056] like Figure 2 and Figure 6 The base shell 10 has mounting ports 26 on the outer frame 11 and / or the base plate 12 for easy wiring, installation of control components and electrical components by the operator. A connecting plate is detachably mounted on the base plate 12, and a sealing plate 27 is provided on the connecting plate to cover the mounting ports 26.

[0057] The control component can be a cylinder, an electric push rod 39 or other drive device, which can directly push the baffle 17 to rise or fall, or the drive device can be used in conjunction with a linkage mechanism, a lead screw and nut mechanism or other linkage mechanism to achieve the effect of controlling the rise and fall of the baffle 17.

[0058] In this embodiment, the control component includes a scissor lift mechanism 31 disposed within the mounting slot 16, and a drive mechanism 38 for driving the scissor lift mechanism 31. The scissor lift mechanism 31 is connected between the baffle 17 and the base shell 10. The drive mechanism 38 drives the scissor lift mechanism 31 to operate, thereby controlling the lifting and lowering of the baffle 17. One or more scissor lift mechanisms 31 are disposed within the mounting slot 16. Specifically, two scissor lift mechanisms 31 are disposed within the mounting slot 16, and the two scissor lift mechanisms 31 are symmetrically arranged about the air guide duct 14, which helps to improve the support effect of the scissor lift mechanism 31 on the baffle 17.

[0059] The scissor lift mechanism 31 includes a first connecting rod 32 and a second connecting rod 34 disposed between the base shell 10 and the baffle 17, and the first connecting rod 32 and the second connecting rod 34 are hinged to each other. Each end of the first connecting rod 32 has a first rotating shaft 33. One end of the first rotating shaft 33 is hinged to the bottom plate 12 of the base shell 10, and the other end of the first rotating shaft 33 is slidably disposed on the baffle 17. Each end of the second connecting rod 34 has a second rotating shaft 35. One end of the second rotating shaft 35 is hinged to the baffle 17, and the other end of the second rotating shaft 35 is slidably disposed on the bottom plate 12 of the base shell 10. The axial distance between the first rotating shafts 33 at both ends of the first connecting rod 32 is the same as the axial distance between the second rotating shafts 35 at both ends of the second connecting rod 34, and the midpoints of the first rotating shafts 33 at both ends of the first connecting rod 32 and the midpoints of the second rotating shafts 35 at both ends of the second connecting rod 34 are hinged to each other.

[0060] As the second rotating shaft 35 slides on the base plate 12, it can drive the angle between the first connecting rod 32 and the second connecting rod 34 to change, and realize the lifting and lowering control of the baffle 17.

[0061] The drive mechanism 38 includes two electric push rods 39 mounted on the base plate 12 of the base housing 10. Each electric push rod 39 corresponds to a second connecting rod 34, and the piston rod of the electric push rod 39 is rotatably connected to the second rotating shaft 35 at the lower end of the second connecting rod 34. The operator controls the piston rods of the two electric push rods 39 to move synchronously, thereby causing the two second connecting rods 34 to rotate, achieving the effect of synchronously raising and lowering the two scissor lift mechanisms 31. By controlling the synchronous raising and lowering of the two scissor lift mechanisms 31, the baffle 17 can be raised and lowered smoothly.

[0062] 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. A top-mounted ventilation device, characterized in that: include Base shell (10); A ventilation channel (15) is provided on the base shell (10) for air circulation; A baffle (17) is movably disposed on the base shell (10), and the movement of the baffle (17) is used to control the opening or closing of the ventilation channel (15); A control component is disposed between the baffle (17) and the base shell (10) for controlling the movement of the baffle (17); When the baffle (17) is open or closed, the projection of the baffle (17) on the base shell (10) always covers the control component and the ventilation channel (15).

2. The top-mounted ventilation device according to claim 1, characterized in that: An inclined guide plate (18) is provided on the peripheral wall of the baffle (17). The side of the inclined guide plate (18) away from the baffle (17) is inclined toward the base shell (10) for guiding flow.

3. A top-mounted ventilation device according to claim 1, characterized in that: A fan (20) is installed on the baffle (17).

4. A top-mounted ventilation device according to claim 3, characterized in that: The fan (20) is a centrifugal fan (20) used to direct the airflow flowing through the ventilation channel (15) in a direction parallel to the baffle (17).

5. A top-mounted ventilation device according to claim 3, characterized in that: The baffle (17) is provided with a flow guide channel (22), which is located at the air inlet of the fan (20). The flow guide channel (22) extends toward the ventilation channel (15) and is connected to the ventilation channel (15).

6. A top-mounted ventilation device according to claim 5, characterized in that: The baffle (17) is covered with a cover (21), which covers the fan (20). The guide channel (22) is fixedly connected to the cover (21) and is connected to the air inlet of the fan (20). The cover (21) is provided with an exhaust port (23), and the air outlet of the fan (20) is connected to the exhaust port (23). The exhaust port (23) is positioned towards the gap between the baffle (17) and the base shell (10).

7. A top-mounted ventilation device according to claim 6, characterized in that: The exhaust port (23) is located on one side of the cover (21), and the inner wall of the cover (21) is used to guide the airflow from the outlet of the fan (20) to the exhaust port (23) so as to improve the air pressure of the exhaust port (23) in the exhaust state.

8. A top-mounted ventilation device according to claim 5, characterized in that: The flow channel (22) and the ventilation channel (15) are nested together.

9. A top-mounted ventilation device according to claim 8, characterized in that: When the baffle (17) is open or closed, the flow channel (22) remains inside the ventilation channel (15).

10. A top-mounted ventilation device according to claim 1, characterized in that: The base shell (10) extends a water baffle (24) on one side toward the baffle (17), and the control components and ventilation channels (15) are both located within the area enclosed by the water baffle (24).

11. A top-mounted ventilation device according to claim 10, characterized in that: A sealing gasket is provided between the base shell (10) and the baffle (17) to form a seal between the base shell (10) and the water baffle (24) when the baffle (17) is closed, and to enclose the control component and ventilation channel (15) within the baffle (17).

12. A top-mounted ventilation device according to claim 1, characterized in that: The base shell (10) is fixedly connected to an air guide tube (14) on the side away from the baffle (17). The inner wall of the air guide tube (14) forms a ventilation channel (15). The air guide tube (14) extends into the base shell (10) and forms a mounting groove (16) with the inner wall of the base shell (10) for accommodating electrical components and the control assembly.

13. A top-mounted ventilation device according to claim 1, characterized in that: The control assembly includes a scissor lift mechanism (31) for connecting the base shell (10) and the baffle (17), and a drive mechanism (38) for driving the scissor lift mechanism (31) to work, the drive mechanism (38) being mounted on the base shell (10).

14. A top-mounted ventilation device according to claim 13, characterized in that: The scissor lift mechanism (31) includes a first link (32) and a second link (34) disposed between the baffle (17) and the base shell (10). The first link (32) and the second link (34) are hinged to each other. One end of the first link (32) is hinged to the bottom wall of the base shell (10), and the other end of the first link (32) is rotatably and slidably disposed on the baffle (17). One end of the second link (34) is hinged to the baffle (17), and the other end of the second link (34) is rotatably and slidably disposed on the bottom wall of the base shell (10). The drive mechanism (38) is used to push the second link (34) to flip.

15. A top-mounted ventilation device according to claim 14, characterized in that: Two scissor lift mechanisms (31) are provided between the baffle (17) and the base shell (10), and the two scissor lift mechanisms (31) are symmetrically arranged about the ventilation channel (15). The drive mechanism (38) includes an electric push rod (39) fixedly connected to the bottom wall of the base shell (10), and the moving part of the electric push rod (39) is connected to the second connecting rod (34).

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