Intake shutter capable of preventing water immersion and self-locking

Abstract

The invention belongs to the technical field of marine corollary equipment, and particularly relates to an anti-immersion self-locking air inlet louver. Comprising a magnetic steel belt driving mechanism which comprises a driving module, a magnetic wheel and a magnetic transmission rod; the driving module drives the magnetic wheel to rotate so as to drive the magnetic transmission rod to move up and down, and therefore the self-balance weight blades are controlled to be opened and closed. The automatic locking mechanism comprises a water accumulation box, an inclined plate, a turnover plate, a linkage shaft, a first push rod, a second push rod and a separation rod. And the separating rod moves upwards to be inserted between the magnetic wheel and the magnetic transmission rod, so that the magnetic wheel is separated from the magnetic transmission rod, and automatic closing of the self-counterweight blade is completed. The shutter has the characteristic that the hinge can be automatically locked without depending on external energy when large water intrudes, and the air inlet shutter can be guaranteed to be excessively closed when water flow is in any emergency state.

Description

Technical Field

[0001] This invention belongs to the technical field of marine equipment, and specifically relates to a water-resistant, self-locking air intake louver. Background Technology

[0002] Air intake louvers are an indispensable part of various marine air intake systems, generally used for weatherproofing. These controllable louvers are the main components for waterproofing and air intake in these systems. Currently, commonly used air intake louvers employ electric or pneumatic actuation as their opening and closing mechanism, offering advantages such as controllable opening angles, universal interfaces, and simple mechanical structures.

[0003] However, current common louvered blinds still have certain reliability issues in extreme working environments. For example, in the event of a power outage, gas outage, or a sudden intrusion of large amounts of rainwater or seawater, they may not be able to seal in time. Therefore, common solutions generally provide backup power and air supply systems, as well as water immersion sensors, for electrically or pneumatically driven louvered blinds to ensure that the blinds can still operate normally in the event of a main power supply failure or water intrusion.

[0004] Therefore, from the perspective of equipment miniaturization and structural reliability, the backup power supply system and sensor system not only make the equipment structure complex and redundant, reducing system reliability, but also cannot completely avoid the problem of the louvers not being able to close due to abnormalities in the louver power supply or sensor function and its sensor power supply system in extreme cases, thereby affecting the performance of the entire air intake device's filtration system and the reliability of the power system. Summary of the Invention

[0005] The purpose of this invention is to provide a water-proof, self-locking air intake louver. This invention's louver has the feature of automatically locking the hinges when encountering a large amount of water intrusion without relying on external energy. It can ensure that the air intake louver can guarantee the excessive closure of water flow in any emergency situation, meeting the requirements of actual use, while also solving problems such as system design redundancy, complex structure, and poor reliability.

[0006] To solve the above-mentioned technical problems, the present invention provides a water-proof, self-locking air inlet louver, comprising:

[0007] The magnetic belt drive mechanism includes: a drive module, a magnetic wheel, and a magnetic transmission rod; the drive module drives the magnetic wheel to rotate, thereby driving the magnetic transmission rod to move up and down, thus controlling the self-weighting blades to open and close.

[0008] An automatic locking mechanism includes: a water collection box, an inclined plate, a flip plate, a linkage shaft, a push rod one, a push rod two, and a separation rod; the water collection box is installed at the bottom of the louver frame, the inclined plate is arranged inside the water collection box, the flip plate is hinged inside the water collection box, so that one end of the flip plate abuts against the bottom of the inclined plate and closes, and the end near the flip plate also includes the inserted linkage shaft, the linkage shaft and the push rod one are movably engaged through a wedge groove, the push rod one and the push rod two, and the push rod two and the separation rod are driven by abutting through a wedge surface, the push rod one, the push rod two and the separation rod are respectively slidably installed on the inner wall of the water collection box;

[0009] The separating rod moves upward and inserts itself between the magnetic wheel and the magnetic transmission rod, thereby separating the magnetic wheel and the magnetic transmission rod to complete the automatic closing of the self-weighting blade.

[0010] Preferably, the drive module includes a drive motor and a gearbox; the drive motor is mounted on the side wall of the louver frame, the output end of the drive motor is provided with a drive gear, the output end of the gearbox is provided with a driven gear, and the drive gear and the driven gear mesh and transmit power to each other, and the output end of the gearbox is provided with a drive bevel gear.

[0011] Preferably, the magnetic wheel includes: a drive wheel, a power shaft, and a driven bevel gear; the power shaft is rotatably mounted on a bearing seat, the bearing seat is slidably engaged with a travel groove, the travel groove is formed on the side wall of the louver frame, one end of the power shaft is provided with the driven bevel gear, the drive bevel gear and the driven bevel gear mesh and transmit power, the other end of the power shaft is provided with the drive wheel, and the circumferential surface of the drive wheel also includes a magnetic steel strip.

[0012] Preferably, the magnetic transmission rod includes a transmission control rod and a second magnetic steel belt. The lower end of the side wall of the transmission control rod near the drive wheel also includes the second magnetic steel belt. The magnetic properties of the first magnetic steel belt and the second magnetic steel belt are opposite to ensure the magnetic attraction effect.

[0013] Preferably, the flip plate is hinged to the inner wall of the water collection box by a pin, and the hinge point of the hinge shaft is set close to the side of the inclined plate, so that the flipping center of the flip plate is located on the side of the length center of the flip plate, thereby realizing that when there is no water on the flip plate, it can automatically return to the closed state of abutting against the inclined plate under the action of gravity.

[0014] Preferably, the top of the water collection box also includes a rainwater collection port; the bottom of the inner cavity of the water collection box on the side away from the inclined plate also includes a water outlet, and the water outlet is located between the end of the flip plate and the inner wall of the water collection box, so that a small flow of rainwater falling on the flip plate can be discharged through the water outlet; the bottom of the inner cavity of the water collection box on the side away from the water outlet also includes a drain outlet, so that a large flow of rainwater falling on the flip plate can be discharged through the drain outlet when water accumulates.

[0015] Preferably, the end face where the inclined plate and the flipping plate abut and close is provided with a wedge-shaped surface; one end of the linkage shaft further includes a connecting rod that is inserted and locked, and one end of the connecting rod further includes a push shaft; one end of the push rod one further includes the wedge-shaped groove, and the push shaft is slidably engaged in the wedge-shaped groove, and the other end of the push rod one is provided with a hemispherical surface; one end of the push rod two is provided with a wedge-shaped surface, and the other end is provided with a hemispherical surface; both ends of the separating rod are provided with wedge-shaped surfaces.

[0016] Preferably, the bottom of the louver frame further includes a waist-shaped groove for rainwater collection, and the waist-shaped groove is connected to the rainwater collection port; the inside of the water collection box further includes an embedded partition to divide it into a rainwater collection chamber and a transmission mounting chamber, and the partition further includes a clearance groove to provide clearance space for the downward movement of the linkage shaft; the top of the water collection box and the bottom of the louver frame further include slots for sliding insertion of the separating rod.

[0017] Preferably, the bottom of the self-weighting blade also includes an integrally formed rotating shaft, the two ends of which are rotatably mounted on the side wall of the louver frame, and a number of linkage components are linearly hinged on the transmission control rod, the other end of which is fixedly sleeved with one end of the rotating shaft.

[0018] Preferred options also include:

[0019] When the rainfall is at a low flow rate, the rainwater enters the water collection box through the rainwater collection port and flows out through the outlet, and the automatic locking mechanism does not operate.

[0020] When the blinds are flooded with a large amount of rainwater in a short period of time, water accumulates inside the water collection box. The flip plate will flip downwards around the pivot pin due to the water accumulation, opening the passage between the flip plate and the tilt plate, allowing water to drain through the drain outlet. At this time, the linkage shaft moves downwards, driving push rod one and push rod two to move, pushing the separation rod upwards, separating the magnetic wheel from the magnetic transmission rod. At this time, the self-weighting blades automatically close due to gravity after the lack of power input, and the power input end stops operating, thus completing the automatic closing of the blinds.

[0021] After closing, the water in the collection box is discharged simultaneously through the drain and outlet, emptying the collection box. The flip plate returns to its original state due to gravity. At this time, the separation rod is no longer squeezed by the push rod two. The tip of the separation rod is squeezed by the magnetic force between the power input end and the magnetic transmission rod, as well as by its own gravity, and exits the locked state, allowing the louver to return to the operable state, that is, the magnetic wheel and the magnetic transmission rod are in contact to realize the power input state.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention presents a novel louver that can prevent short-term, high-volume water intrusion even without power. The louver features a modular design, allowing for flexible disassembly, modification, and maintenance of all parts. This invention solves the problem of traditional air intake devices' louvers being unable to handle short-term, high-volume water intrusion without power, thus addressing the reliability issues of the original devices. Furthermore, this invention effectively reduces design redundancy in the air intake device's louvers in this direction. The entire device is simple in design and easy to disassemble, replace, and maintain. In practical use, it effectively improves and ensures the overall reliability of the air intake device. Attached Figure Description

[0024] Figure 1 The present invention provides a structural diagram of a water-resistant, self-locking air intake louver.

[0025] Figure 2 This is a side view of the structure of the self-weighting blade and magnetic transmission rod provided by the present invention.

[0026] Figure 3 This is a three-dimensional view of the self-weighting blade and magnetic transmission rod provided by the present invention.

[0027] Figure 4 This is a cross-sectional view of the automatic locking mechanism provided by the present invention.

[0028] Figure 5 This is an internal top view of the automatic locking mechanism provided by the present invention.

[0029] Figure 6 The structural diagram of the linkage shaft and push rod for one-phase transmission provided by the present invention is shown.

[0030] Figure 7 The structural diagram of the push rod 2 and the separation rod phase transmission provided by the present invention.

[0031] Figure 8 The structural diagram of the separation rod, drive wheel and magnetic transmission rod for the transmission provided by the present invention.

[0032] In the diagram: 1-Venere frame, 11-Waist-shaped groove, 2-Self-weighting blade, 21-Rotating shaft, 22-Linkage component, 3-Magnetic belt drive mechanism, 31-Drive module, 311-Drive motor, 312-Reduction gearbox, 32-Magnetic wheel, 321-Drive wheel, 322-Driven bevel gear, 33-Magnetic transmission rod, 4-Automatic locking mechanism, 41-Water collection box, 411-Rainwater collection port, 412-Outlet, 413-Drain outlet, 414-Baffle plate, 42-Inclined plate, 43-Flipping plate, 431-Pin shaft, 44-Linkage shaft, 441-Connecting rod, 442-Push shaft, 45-Push rod one, 451-Wedge groove, 46-Push rod two, 47-Separation rod. Detailed Implementation

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0034] like Figures 1-8 As shown, this embodiment of the invention specifically provides a water-resistant, self-locking air intake louver, comprising:

[0035] The magnetic belt drive mechanism 3 is a detachable modular design structure, including: a drive module 31, a magnetic wheel 32, and a magnetic transmission rod 33; the drive module 31 drives the magnetic wheel 32 to rotate, and uses magnetic attraction to drive the magnetic transmission rod 33 to move up and down, thereby controlling the opening and closing of the self-weighting blade 2; wherein the self-weighting blade 2 can fall and close by gravity when there is no power input;

[0036] The automatic locking mechanism 4 is a detachable modular design, comprising: a water collection box 41, an inclined plate 42, a flip plate 43, a linkage shaft 44, a first push rod 45, a second push rod 46, and a separating rod 47. The water collection box 41 is installed at the bottom of the louver frame 1. The inclined plate 42 is arranged inside the water collection box 41. The flip plate 43 is hinged inside the water collection box 41, so that one end of the flip plate 43 abuts against the bottom of the inclined plate 42 to close. The end near the flip plate 43 also includes an inserted linkage shaft 44. The linkage shaft 44 and the first push rod 45 are movably engaged through a wedge-shaped groove 451. The first push rod 45 and the second push rod 46, and the second push rod 46 and the separating rod 47 are driven by abutting surfaces. The first push rod 45, the second push rod 46, and the... Separating rods 47 are slidably installed on the inner wall of the water collection box 41. When the above-mentioned flip plate 43 flips downward due to water accumulation, a drainage channel is formed, which at the same time drives the linkage shaft 44 to move downward. The linkage shaft 44 drives the push rod 45 to move to the left through the cooperation of the push shaft 442 and the wedge groove 451. The push rod 45 pushes the push rod 46 forward through the wedge surface. The push rod 46 pushes the separating rod 47 upward through the wedge surface, so that the wedge tip of the separating rod 47 is inserted between the magnetic wheel 32 and the magnetic transmission rod 33, so that the magnetic wheel 32 slides on the stroke groove to separate the magnetic wheel 32 and the magnetic transmission rod 33. At this time, the power input is closed. At this time, the self-weighting blade 2 completes the automatic closing of the louver under its own gravity.

[0037] The separating rod 47 moves upward and is inserted between the magnetic wheel 32 and the magnetic transmission rod 33 to separate the magnetic wheel 32 and the magnetic transmission rod 33, thereby completing the automatic closing of the self-weighting blade 2.

[0038] The drive module 31 includes a drive motor 311 and a gearbox 312. The drive motor 311 is mounted on the side wall of the louver frame 1. The output end of the drive motor 311 is provided with a drive gear, and the output end of the gearbox 312 is provided with a driven gear. The drive gear and the driven gear mesh and drive each other. The output end of the gearbox 312 is provided with a drive bevel gear.

[0039] The magnetic wheel 32 includes a drive wheel 321, a power shaft, and a driven bevel gear 322. The power shaft is rotatably mounted on a bearing housing, which is slidably engaged with a stroke groove on the side wall of the louver frame 1. One end of the power shaft is equipped with the driven bevel gear 322, which meshes with the drive bevel gear 322 for transmission. The other end of the power shaft is equipped with the drive wheel 321, and the circumference of the drive wheel 321 is also covered with a magnetic steel belt. When the reduction gearbox 312 transmits power to the driven bevel gear 322, the drive wheel 321 is driven to rotate via the power shaft. At this time, the drive wheel 321 is provided with rotational support through the bearing housing, and the design of the stroke groove provides a sliding path for the drive wheel 321 to separate from the transmission control lever.

[0040] The magnetic transmission rod 33 includes a transmission control rod and a second magnetic steel belt. The lower end of the side wall of the transmission control rod near the drive wheel 321 also includes a second magnetic steel belt. The magnetic properties of the first magnetic steel belt and the second magnetic steel belt are opposite to ensure the magnetic attraction effect.

[0041] The flip plate 43 is hinged to the inner wall of the water collection box 41 by a pin 431, and the hinge point of the hinge shaft is set close to the side of the inclined plate 42, so that the flip center of the flip plate 43 is located on the side of the length center of the flip plate 43, thereby realizing that when there is no water accumulation on the flip plate 43, it can automatically return to the closed state of abutting against the inclined plate 42 under the action of gravity.

[0042] The top of the water collection box 41 also includes a rainwater collection port 411; the bottom of the inner cavity of the water collection box 41 on the side away from the inclined plate 42 also includes a water outlet 412, and the water outlet 412 is located between the end of the flip plate 43 and the inner wall of the water collection box 41, so that the small flow of rainwater falling on the flip plate 43 can be discharged through the water outlet 412; the bottom of the inner cavity of the water collection box 41 on the side away from the water outlet 412 also includes a drain outlet 413, so that the large flow of rainwater falling on the flip plate 43 can be discharged through the drain outlet 413 when water accumulates.

[0043] The end faces of the inclined plate 42 and the flip plate 43 that abut and close together are wedge-shaped; one end of the linkage shaft 44 also includes a connecting rod 441 that is inserted and locked, and one end of the connecting rod 441 also includes a push shaft 442; one end of the push rod 45 also includes a wedge-shaped groove 451, and the push shaft 442 is slidably engaged in the wedge-shaped groove 451, and the other end of the push rod 45 is hemispherical; one end of the push rod 46 is wedge-shaped, and the other end is hemispherical; both ends of the separating rod 47 are wedge-shaped.

[0044] The bottom of the louver frame 1 also includes a waist-shaped groove 11 for rainwater collection, and the waist-shaped groove 11 is connected to the rainwater collection port 411; the inside of the water collection box 41 also includes an embedded partition 414 to divide it into a rainwater collection chamber and a transmission mounting chamber, and the partition 414 also includes a clearance groove to provide clearance space for the downward movement of the linkage shaft 44; the top of the water collection box 41 and the bottom of the louver frame 1 also include slots for sliding insertion of the separation rod 47. As a further optimization of the embodiment of the present invention, the above-mentioned clearance groove and slot also include a sealing strip, which can achieve a sealing effect during sliding to reduce the seepage of external rainwater into the transmission mounting chamber through its gaps.

[0045] The bottom of the self-weighting blade 2 also includes an integrally set rotating shaft 21. The two ends of the rotating shaft 21 are rotatably mounted on the side wall of the louver frame 1. Several linkage components 22 are linearly hinged on the transmission control rod. The other end of the linkage component 22 is fixedly sleeved with one end of the rotating shaft 21. The linkage component 22 can preferably be set with an eccentric cam structure.

[0046] As a further explanation of the embodiments of the present invention, the present invention also includes the following working principle:

[0047] When the louvers are in normal use, that is, when the rainwater flow is small, such as splashing, the rainwater enters the water collection box 41 through the rainwater collection port 411 and flows out through the outlet 412. The automatic locking mechanism 4 does not operate.

[0048] When the blinds are flooded by a large amount of rainwater in a short period of time, water accumulates inside the water collection box 41. The flip plate 43 will flip downwards due to the water accumulation, with the pin 431 as the rotation center. This opens the passage between the flip plate 43 and the inclined plate 42, allowing water to drain through the drain outlet 413. At this time, the linkage shaft 44 moves downwards, driving the push rod 1 45 and push rod 2 46 to move, pushing the separation rod 47 upwards, separating the magnetic wheel 32 from the magnetic transmission rod 33. At this time, the self-weighting blade 2 automatically closes due to gravity after the lack of power input, and the power input end stops operating, thus completing the automatic closing of the blinds.

[0049] After closing, the water in the water collection box 41 is discharged simultaneously through the drain outlet 413 and the outlet 412, emptying the water collection box 41. The flip plate 43 returns to its original state due to gravity. At this time, the separation rod 47 is no longer squeezed by the push rod 46. The tip of the separation rod 47 is squeezed by the magnetic force between the power input end and the magnetic transmission rod 33 and by its own gravity, thus exiting the locked state and restoring the louver to the operable state, that is, the magnetic wheel 32 and the magnetic transmission rod 33 are in contact to realize the power input state.

[0050] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A submersible self-closing inlet louvre characterised in that, It includes: Magnetic steel belt drive mechanism (3), including: drive module (31), magnetic wheel (32) and magnetic transmission rod (33); the drive module (31) drives the magnetic wheel (32) to rotate, so that the magnetic transmission rod (33) moves up and down, thereby controlling the opening and closing action of the self-weighted blade (2); Automatic locking mechanism (4), including: water collecting box (41), inclined plate (42), turnover plate (43), linkage shaft (44), push rod one (45), push rod two (46) and separation rod (47); the water collecting box (41) is installed at the bottom of the shutter frame (1), the water collecting box (41) is provided with the inclined plate (42), the turnover plate (43) is hinged in the water collecting box (41), one end of the turnover plate (43) abuts against the bottom of the inclined plate (42) to close, and the end close to the turnover plate (43) further includes the inserted linkage shaft (44), the linkage shaft (44) and the push rod one (45) are movably connected through the wedge-shaped groove (451), the push rod one (45) and the push rod two (46) and the separation rod (47) are connected through the wedge-shaped surface, and the push rod one (45), the push rod two (46) and the separation rod (47) are slidably installed on the inner wall of the water collecting box (41); The separation rod (47) is inserted between the magnetic wheel (32) and the magnetic transmission rod (33) to separate the magnetic wheel (32) and the magnetic transmission rod (33), so that the automatic closing of the self-weighted blade (2) is completed.

2. A submersible self-closing inlet louvre according to claim 1 wherein, The drive module (31) includes: drive motor (311) and reduction box (312); the drive motor (311) is installed on the side wall of the shutter frame (1), the output end of the drive motor (311) is provided with a driving gear, the output end of the reduction box (312) is provided with a driven gear, and the driving gear and the driven gear are engaged and driven, and the output end of the reduction box (312) is provided with a driving bevel gear.

3. A submersible self-latching inlet louvre as claimed in claim 2, wherein, The magnetic wheel (32) includes: driving wheel (321), power shaft and driven bevel gear (322); the power shaft is rotatably installed on the bearing seat, the bearing seat is slidably connected to the stroke groove, the stroke groove is formed in the side wall of the shutter frame (1), one end of the power shaft is provided with the driven bevel gear (322), the driving bevel gear and the driven bevel gear (322) are engaged and driven, the other end of the power shaft is provided with the driving wheel (321), and the circumferential surface of the driving wheel (321) further includes a coated magnetic steel belt one.

4. A submersible self-latching inlet louvre as claimed in claim 3 wherein, The magnetic transmission rod (33) includes: transmission control rod and magnetic steel belt two, the side wall lower end of the transmission control rod close to one side of the driving wheel (321) further includes the magnetic steel belt two, the magnetic steel belt one and the magnetic steel belt two are opposite in magnetic property to ensure magnetic attraction effect.

5. A submersible self-latching inlet louvre as claimed in claim 1 wherein, The turnover plate (43) is hinged to the inner wall of the water collecting box (41) through a pin shaft (431), and the hinge point of the hinge shaft is arranged close to one side of the inclined plate (42), so that the center of the turnover plate (43) is arranged on one side of the length center of the turnover plate (43), thereby realizing that the turnover plate (43) can automatically restore the state of abutting and closing with the inclined plate (42) under the action of gravity when there is no water on the turnover plate (43).

6. A submersible self-latching inlet louvre as claimed in claim 1 wherein, The top of the water collecting box (41) further comprises a rainwater collecting opening (411); the bottom of the inner cavity of the water collecting box (41) away from one side of the inclined plate (42) further comprises a water outlet (412), and the water outlet (412) is located between the end of the turnover plate (43) and the inner side wall of the water collecting box (41), so that the small flow of rainwater falling on the turnover plate (43) is discharged through the water outlet (412); the bottom of the inner cavity of the water collecting box (41) away from the water outlet (412) further comprises a water outlet (413), so that the large flow of rainwater falling on the turnover plate (43) is discharged through the water outlet (413) when the water is accumulated.

7. A submersible self-latching inlet louvre as claimed in claim 1 wherein, The abutting and closing end face between the inclined plate (42) and the turnover plate (43) is provided as a wedge-shaped face; one end of the linkage shaft (44) further comprises a connecting rod (441) which is inserted and locked, one end of the connecting rod (441) further comprises a push shaft (442); one end of the push rod (45) further comprises the wedge-shaped groove (451), the push shaft (442) is slidingly connected in the wedge-shaped groove (451), the other end of the push rod (45) is provided as a hemispherical face; one end of the push rod (46) is provided as a wedge-shaped face, and the other end is provided as a hemispherical face; both ends of the separation rod (47) are provided as wedge-shaped faces.

8. A submersible self-latching inlet louvre as claimed in claim 6 wherein, The bottom of the shutter frame (1) further comprises a waist-shaped groove (11) which is opened, for rainwater collection, and the waist-shaped groove (11) is in communication with the rainwater collecting opening (411); the inside of the water collecting box (41) further comprises an embedded partition (414) to divide into a rainwater collecting cavity and a transmission installation cavity, and the partition (414) further comprises an avoidance groove which is opened, for providing avoidance space for the downward movement of the linkage shaft (44); the top of the water collecting box (41) and the bottom of the shutter frame (1) further comprise an inserted slot which is opened, for slidingly inserting the separation rod (47).

9. A submersible self-latching inlet louvre as claimed in claim 4 wherein, The bottom of the self-weighted blade (2) further comprises an integral rotary shaft (21), both ends of the rotary shaft (21) are rotatably installed on the side wall of the shutter frame (1), and a plurality of linkage members (22) are linearly hinged on the transmission control rod, and the other end of the linkage member (22) is fixedly sleeved with one end of the rotary shaft (21).

10. A submersible self-closing air inlet louvre according to any one of claims 1 to 9, wherein, Further comprising: When the amount of rainwater is in a splashing small flow state, the rainwater enters the water collecting box (41) through the rainwater collecting opening (411) and flows out through the water outlet (412), and the automatic locking mechanism (4) does not work; When the shutter is subjected to large amount of rainwater in a short time, i.e. water is accumulated in the water accumulation box (41), the turnover plate (43) will be turned down by the water as the rotation center of the pin shaft (431), so that the turnover plate (43) and the inclined plate (42) are opened to form a passage, and the water is discharged through the water outlet (413). At this time, the linkage shaft (44) moves down, driving the push rod I (45) and the push rod II (46) to move, so as to push the separation rod (47) to move up, separate the magnetic wheel (32) from the magnetic transmission rod (33), at this time, the self-weight blade (2) is automatically closed due to the gravity without power input, and the power input end stops working, so as to complete the automatic closing of the shutter. After closing, the water in the water accumulation box (41) is discharged through the water outlet (413) and the water outlet (412) at the same time, and the water accumulation box (41) is emptied. The turnover plate (43) returns to the original state due to the gravity. At this time, the separation rod (47) is no longer pressed by the push rod II (46), the tip of the separation rod (47) is pressed by the magnetic force between the power input end and the magnetic transmission rod (33) and its own gravity, and exits the locking state, so that the shutter returns to the operable state again, i.e. the magnetic wheel (32) and the magnetic transmission rod (33) are in contact to realize the power input state.

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