CN113756696B

CN113756696B - Marine airtight shutter and application method thereof

Info

Publication number: CN113756696B
Application number: CN202111047126.0A
Authority: CN
Inventors: 施晓波; 祁丽; 傅香菊; 尹墨晗; 邵维青
Original assignee: Hudong Zhonghua Shipbuilding Group Co Ltd
Current assignee: Hudong Zhonghua Shipbuilding Group Co Ltd
Priority date: 2021-09-07
Filing date: 2021-09-07
Publication date: 2023-05-05
Anticipated expiration: 2041-09-07
Also published as: CN113756696A

Abstract

The invention discloses a marine airtight shutter and a use method thereof. After the double-layer shutter is closed, an inner and outer double-closed space is formed, and the hollow high-temperature-resistant sealing strip is extruded in the closed space, so that the double-layer shutter has bidirectional tightness, the tightness of the shutter is greatly improved, and the closed form is novel.

Description

Marine airtight shutter and application method thereof

Technical Field

The invention relates to the technical field of ship construction, in particular to a marine airtight shutter and a use method thereof.

Background

At present, the external ventilation shutter used for the ship air-conditioning ventilation system is mostly single-layer weather tight, when encountering heavy wind and rain, the shutter can only be closed to avoid invasion of wind and rain into the ventilation system, and the shutter does not have higher tightness after closing, so that pollutants such as nuclear and biochemical cannot be blocked. The single-layer weather-tight shutter cannot bear high Wen Weiyan gas attack generated after missile launching for many times in a ship missile area, and the shutter blades are easy to deform to influence the compactness of the shutter after closing.

Disclosure of Invention

In view of the above, the present invention provides a marine airtight shutter and a method for using the same, which are used for solving the problems in the prior art.

The marine airtight shutter comprises a window frame body fixed on a bulkhead, a water blocking grille embedded on the front surface of the window frame body, and a blade assembly arranged in the window frame body, wherein an upper cavity is arranged at the top of the window frame body, a lower cavity is arranged at the bottom of the window frame body, a transmission mechanism is arranged in the upper cavity, a connecting rod mechanism is arranged in the lower cavity,

the blade assembly comprises a plurality of blades which are arranged side by side, wherein the upper end and the lower end of one blade are respectively connected with the transmission mechanism and the connecting rod mechanism through driving blade shafts, and the driven blade shafts at the upper ends of other blades are embedded in the upper cavity, and the driven blade shafts at the lower ends are connected with the connecting rod mechanism.

Preferably, the blade on the side in the blade assembly is a side blade box, the blade in the middle is a middle blade box,

the side blade box and the middle blade box all include first folded plate, second folded plate, third folded plate and first sealing strip, thereby the second folded plate is involuted mutually with first folded plate and is formed the cavity between the two, and the both ends of cavity are sealed through third folded plate and/or first sealing strip, first sealing strip includes the flexible head, extends convex joint portion from the flexible head, the tip bending type of joint portion is formed with the ditch slot, and the joint portion of first sealing strip is attached on second folded plate or third folded plate and makes the edge card stopper of second folded plate or third folded plate in ditch shape inslot.

Preferably, the shape of the first folded plate in the middle blade box is the same as that of the second folded plate, two end parts of the cavity formed by the first folded plate and the second folded plate in a closing way are combined and sealed through the third folded plate and the first sealing strip, and the clamping part of the first sealing strip is attached to the third folded plate and enables the edge of the third folded plate to be clamped in the groove-shaped groove.

Preferably, the first folded plate and the second folded plate are composed of a first U-shaped plate body with a flanging and a first protection folded edge arranged at one end part of the first U-shaped plate body, the first protection folded edge is bent or bent towards the opening direction of the first U-shaped plate body so as to shield and protect the first sealing strip when the shutter is closed, and a first installation shaft hole is formed in the middle of the first U-shaped plate body.

Preferably, the shape of the first folded plate in the side blade box is different from the shape of the second folded plate, the first end of the cavity formed by the first folded plate and the second folded plate in a closing way is sealed only by the first sealing strip, and the second end is sealed by the third folded plate and the first sealing strip combination.

Preferably, the first folded plate is composed of a second U-shaped plate body with a turned edge and a second protection folded edge arranged at one end part of the second U-shaped plate body, and the second protection folded edge is bent or bent towards the opening direction of the second U-shaped plate body so as to shield and protect the first sealing strip when the shutter is closed;

the second folded plate is composed of a third U-shaped plate body with a flanging, and a mounting flanging which is arranged at the first end of the third U-shaped plate body and used for enabling the edge of the third U-shaped plate body to be blocked in a groove of the first sealing strip, and second mounting shaft holes are formed in the middle of the second U-shaped plate body and the middle of the third U-shaped plate body.

Preferably, the third folded plate is composed of a fixed folded edge clamped in the first folded plate or the second folded plate and a step-shaped folded edge arranged at the root of the fixed folded edge, and the root of the step-shaped folded edge, the joint of the step-shaped folded edge and the fixed folded edge are all provided with arc-shaped rounded corners.

Preferably, the bottom surface of the upper cavity and the top surface of the lower cavity are all staggered with a plurality of baffles, each baffle is provided with a second sealing strip which has the same structure as the first sealing strip, the deformable head of the second sealing strip is positioned between the vertical edge of the baffle and the blade, and the horizontal edge of the baffle is blocked in the groove of the second sealing strip.

The application method of the marine airtight shutter concretely comprises the following steps:

inserting the operating handle into a transmission mechanism, enabling the transmission mechanism to rotate through a driving blade shaft with blades connected with the driving blade shaft, enabling the driving blade shaft fixed at the lower end of the blades to rotate through a connecting rod mechanism, and enabling the connecting rod mechanism to drive other blades to rotate through a driven blade shaft;

in the process of rotating all the blades, the deformable head part of the first sealing strip in the middle blade box is extruded and deformed by the middle blade box or the side blade box at the adjacent side until the first protection folding edge or the second protection folding edge on the middle blade box or the side blade box at the adjacent side just shields the deformed first sealing strip, so that the shutter is closed.

Preferably, the deformable heads of the second sealing strips between each baffle and its corresponding side or middle blade cassette are deformed by compression during rotation of all the blades.

The beneficial effects of the invention are as follows:

1. the invention is a double-layer shutter, the first layer is an inclined shutter water-retaining grille, the second layer is a blade component, and the middle blade box and the side blade box in the blade component are formed by combining thin plates formed by numerical control flanging through punching, and the shutter has the characteristics of high structural strength and light weight.

2. After the double-layer shutter is closed, an inner and outer double-closed space is formed, and the hollow high-temperature-resistant sealing strip is extruded in the closed space, so that the double-layer shutter has bidirectional tightness, the tightness of the shutter is greatly improved, and the closed form is novel. And the V-shaped protection folds protruding on each airtight blade (the middle blade box and the side blade boxes) play a role in shielding and protecting the sealing strip, so that corrosion of seawater, harmful gas and the like to the sealing strip can be reduced, and the service life of the sealing strip is prolonged.

3. According to actual needs, the middle blade box and the side blade boxes can be filled with fireproof insulating heat-insulating materials, and can be used for ventilation places with different requirements.

4. The invention is embedded type wall-mounted, the opening and closing operation handle is detachable, and the front surface is smooth and beautiful.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a front view of the blind of the present invention.

Fig. 2 is a cross-sectional view taken along A-A in fig. 1.

Fig. 3 is a B-B sectional view of the blind of fig. 2 when opened.

Fig. 4 is a B-B cross-sectional view of the blind of fig. 2 when closed.

Fig. 5 is an enlarged view of section i of fig. 4.

Fig. 6 is an enlarged view of section ii of fig. 4.

Fig. 7 is a schematic view of the structure of the side blade case.

Fig. 8 is an exploded view of a side leaf box.

Fig. 9 is a schematic view of the structure of the first flap in the side blade case.

Fig. 10 is a schematic view of the structure of the second flap in the side blade case.

Fig. 11 is a schematic structural view of the intermediate blade case.

Fig. 12 is an exploded view of the intermediate blade case.

Fig. 13 is a schematic view of the structure of the first flap and the second flap in the intermediate blade case.

Fig. 14 is a schematic structural view of a third flap in the side and middle blade cases.

Fig. 15 is a schematic structural view of the first seal strip in the side blade case and the middle blade case.

Fig. 16 is a schematic view of a state in the shutter closing process.

Fig. 17 is a schematic view of the blind when fully closed.

Fig. 18 is a schematic diagram of the connection of the driving blade shaft, the driven blade shaft and the link mechanism.

The meaning of the reference numerals in the figures is:

1 is a window frame body, 11 is an upper cavity, 12 is a lower cavity, 13 is a baffle, 14 is a second sealing strip,

2 is a water retaining grille, 3 is a blade component, 31 is a driving blade shaft, 32 is a driven blade shaft, 33 is a side blade box, 34 is a middle blade box, 35 is a first folded plate, 36 is a second folded plate, 37 is a third folded plate, 38 is a first sealing strip, 39 is a deformable head, 310 is a clamping part, 311 is a groove, 312 is a flanging, 313 is a first U-shaped plate body, 314 is a first protection flanging, 315 is a first mounting shaft hole, 316 is a fixed flanging, 317 is a step-shaped flanging, 318 is a second U-shaped plate body, 319 is a second protection flanging, 320 is a third U-shaped plate body, 321 is a mounting flanging, 322 is a second mounting shaft hole,

4 is a transmission mechanism, and the transmission mechanism is a transmission mechanism,

and 5 is a connecting rod mechanism, and the connecting rod mechanism is a connecting rod mechanism,

6 is a seat board, the seat board is a seat board,

7 is an operation handle, and the handle is provided with a handle,

8 is a bulkhead.

Detailed Description

For a better understanding of the technical solution of the present invention, the following detailed description of the embodiments of the present invention refers to the accompanying drawings.

It should be understood that the described embodiments are merely some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

The present application is described in further detail below by way of specific embodiments and with reference to the accompanying drawings.

In the description of the present application, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly specified or limited otherwise; the term "plurality" means two or more, unless specified or indicated otherwise; the terms "coupled," "secured," and the like are to be construed broadly, and may be fixedly coupled, detachably coupled, or integrally connected, for example; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, it should be understood that the terms "upper," "lower," "left," "right," and the like in the embodiments of the present application are described in terms of angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements.

The invention provides a marine airtight shutter which comprises a window frame body 1 fixed on a bulkhead, a water blocking grid 2 embedded in the front surface of the window frame body 1 and a blade assembly 3 arranged in the window frame body 1.

The top of window frame body 1 is provided with cavity 11, bottom is provided with cavity 12 down, installs drive mechanism 4 in the cavity 11, installs link mechanism 5 in the cavity 12 down. In this embodiment, the window frame body 1 is a rectangular frame made of stainless steel, and the front periphery of the rectangular frame is provided with a folded edge, and the folded edge is fixed with a seat board 6 welded and fixed on the bulkhead by bolts.

The blade assembly 3 comprises a plurality of blades which are arranged side by side, wherein the upper end part and the lower end part of one blade are respectively provided with a driving blade shaft 31, the driving blade shaft 31 at the upper end part passes through the upper cavity 11 to be connected with the transmission mechanism 4, and the driving blade shaft 31 at the lower end part passes through the lower cavity 12 to be connected with the link mechanism 5; the driven vane shafts 32 at the upper end parts are embedded in the upper cavity 11, and the driven vane shafts 32 at the lower end parts penetrate through the lower cavity 12 and are connected with the link mechanism 5.

When the operating handle 7 is inserted into the transmission mechanism 4, the transmission mechanism 4 can be driven to rotate by rotating the operating handle 7, and the transmission mechanism 4 drives the blades connected with the driving blade shaft 31 to rotate, and as the driving blade shaft 31 at the lower end part of the blade is connected with the driven blade shafts 32 at the lower end parts of other blades, the link mechanism 5 can drive other blades to link.

As shown in fig. 2, 3, 4 and 18, in this embodiment, the blade assembly 3 in the window frame body 1 includes 4 side-by-side blades, the upper and lower ends of the 3 rd blade from the left are respectively fixed with a driving blade shaft, the driving blade shaft fixed at the upper end portion passes through the upper cavity to be connected with the worm gear mechanism, and the driving blade shaft fixed at the lower end portion passes through the lower cavity to be connected with the link mechanism; the upper and lower ends of the rest blades are respectively fixed with a driven blade shaft, the driven blade shaft fixed at the upper end of each blade penetrates through the upper cavity and protrudes out of the upper cavity by 2-3 mm, and the driven blade shaft fixed at the lower end of each blade penetrates through the lower cavity to be connected with the connecting rod mechanism.

In this embodiment, the transmission mechanism 4 is a worm gear mechanism; the operating handle 7 is a portable rotary sleeve, the end part of the sleeve is in an inner quadrangle shape, when the operating handle 7 stretches into the worm head part of the worm gear mechanism from the front surface of the water retaining grille 2, the shutter can be opened and closed through the operating handle 7, the shutter blade assembly 3 is closed when the operating handle 7 is rotated clockwise, and the shutter blade assembly 3 is opened when the operating handle 7 is rotated anticlockwise.

The blades of the water retaining grille 2 are stainless steel inclined louvers, a stainless steel wire net is arranged at the rear part of the water retaining grille 2, and the water retaining grille 2 is integrally embedded and installed from the front face of the window frame body 1 and then fixed with the window frame body 1 through screws.

When the blade assembly 3 is installed between the upper and lower cavities of the window frame body 1, the respective blades thereof are arranged side by side, the blade located at the side is a side blade box 33, and the blade located in the middle is a middle blade box 34.

The side and

middle blade cases

33, 34 each include a first flap 35, a second flap 36, a third flap 37, and a first seal 38. The second flap 36 is opposed to the first flap 35 to form a cavity therebetween, and both ends of the cavity are sealed by a third flap 37 and/or a first seal 38.

The first sealing strip 38 comprises a deformable head 39 and a clamping part 310 extending and protruding from the deformable head 39, a groove-shaped groove 311 is formed at the end part of the clamping part 310 in a bending mode, the clamping part of the first sealing strip 38 is attached to the second folding plate 36 or the third folding plate 37, and the edge of the second folding plate 36 or the third folding plate 37 is clamped in the groove-shaped groove 311. The first sealing strip 38 is integrally injection molded by high temperature resistant silicone rubber, the cross section of the first sealing strip is q-shaped, the deformable head 39 of the first sealing strip is o-shaped, and after the first sealing strip is extruded and deformed, the deformable head 39 of the first sealing strip is deformed from o-shaped to 0-shaped, so that the sealing effect is achieved.

In this embodiment, the structures of the middle blade case 34 and the side blade case 33 are slightly different.

Specifically, the shape of the first folded plate 35 in the middle blade box 34 is the same as the shape of the second folded plate 36, and both end parts of the cavity formed by the first folded plate 35 and the second folded plate 36 are combined and sealed by the third folded plate 37 and the first sealing strip 38. The first folding plate 35 and the second folding plate 36 are composed of a first U-shaped plate body 313 with a flanging 312 and a first protection flanging 314 arranged at one end part of the first U-shaped plate body 313, and a first installation shaft hole 315 is arranged in the middle of the first U-shaped plate body 313. The first protection edge 314 is bent or folded towards the opening direction of the first U-shaped plate 313 to shield the first sealing strip 38 when the shutter is closed, the first protection edge 314 is formed by punching and numerical control of a stainless steel sheet (1 mm), preferably, the first protection edge 314 can be provided in a V shape, and the angle of the V shape is preferably 120 °.

The third folded plate 37 is composed of a fixed folded edge 316 clamped in the first folded plate 35 or the second folded plate 36, and a step folded edge 317 arranged at the root of the fixed folded edge 316. In order to prevent the first sealing strip from being pierced by the sharp folding angle of the third folded plate during the shutter closing process, the step root of the step-shaped folded edge 317 of the third folded plate and the connection part of the step-shaped folded edge 317 and the fixed folded edge 316 are all provided with arc-shaped rounded corners.

When the middle blade box 34 is assembled, the first folding plate 35 and the second folding plate 36 are matched in a central symmetry mode; then, a group of third folding plates 37 and first sealing strips 38 are mounted at one end of the cavity (the fixed folding edge of the third folding plate at the position is clamped in the first U-shaped plate body of the first folding plate 35 and fixed by rivets, the clamping part of the first sealing strips 38 is attached to the step-shaped folding edge 317 of the third folding plate 37 and the edge of the step-shaped folding edge 317 is clamped in the groove 311 of the step-shaped folding edge), and the other group of third folding plates 37 and first sealing strips 38 are mounted at the other end of the cavity (the fixed folding edge of the third folding plate at the position is clamped in the first U-shaped plate body of the second folding plate 36 and fixed by rivets, and the clamping part of the first sealing strips 38 is attached to the step-shaped folding edge of the third folding plate 37 and the edge of the step-shaped folding edge 317 is clamped in the groove 311 of the step-shaped folding edge); the cavity between the first folding plate 35 and the second folding plate 36 can be filled with fireproof insulation or thermal insulation and the like to play a role in fireproof insulation; finally, the turned edges 312 of the first folding plate 35 and the second folding plate 36 are fixedly connected through butt welding or argon arc welding technology.

The shape of the first folded plate 35 in the side blade box 33 is different from the shape of the second folded plate 36, the first end of the cavity formed by the first folded plate 35 and the second folded plate 36 in a closing way is sealed only by the first sealing strip 38, and the second end is sealed by the combination of the third folded plate 37 and the first sealing strip 38. The first folding plate 35 is composed of a second U-shaped plate 318 with a flange 312 and a second protection folding edge 319 arranged at one end of the second U-shaped plate 318, the second protection folding edge 319 is bent or folded towards the opening direction of the second U-shaped plate 318 to shield and protect the first sealing strip 38 when the shutter is closed, the second protection folding edge 314 is formed by punching and numerical control folding of a stainless steel sheet (1 mm), preferably, the first protection folding edge 314 can be arranged in a V shape, and the angle of the V shape is preferably 120 degrees. The second folding plate 36 is composed of a third U-shaped plate 320 with a flanging 312, and a mounting flanging 321 arranged at the first end of the third U-shaped plate 320 for enabling the edge of the third U-shaped plate to be blocked in the groove of the first sealing strip 38. The second U-shaped plate 318 of the first folded plate and the third U-shaped plate 320 of the second folded plate are respectively provided with a second installation shaft hole 322 at the middle part.

The third flap in the side blade box 33 is of the same construction as the third flap in the middle blade box 34.

When the side blade box 33 is assembled, the first folding plate 35 and the second folding plate 36 are matched; then, attaching the clamping part of one first sealing strip to the mounting folded edge 321 of the second folded plate and enabling the edge of the mounting folded edge 321 to be clamped in the groove-shaped groove of the mounting folded edge, mounting the other first sealing strip and the third folded edge at the other opposite end of the cavity (the fixed folded edge 316 of the third folded plate at the position is clamped in the second U-shaped plate body 318 of the first folded plate and fixed by rivets), and attaching the clamping part of the first sealing strip to the step-shaped folded edge of the third folded plate and enabling the edge of the step-shaped folded edge to be clamped in the groove-shaped groove of the step-shaped folded edge); the cavity between the first folded plate and the second folded plate can be filled with fireproof insulation or heat preservation and heat insulation and the like to play a role in fireproof and heat insulation; and finally, connecting and fixing the folded flanges of the first folded plate and the second folded plate through a butt welding or argon arc welding process.

In this embodiment, the fireproof insulating materials filled in the middle blade case 34 and the side blade case 33 are materials that can meet the fireproof requirements of a 60.

When each blade of the blade assembly 3 is installed in the window frame body 1, the bottom surface of the upper cavity 11 and the top surface of the lower cavity 12 are provided with a plurality of baffles 13 in a staggered mode, each baffle 13 is provided with a second sealing strip 14, and the shape and the structure of the second sealing strip 14 are identical to those of the first sealing strip 38. Each of the driving blade shaft 31 and the driven blade shaft 32 is provided with an L-shaped baffle 13 on both sides, the vertical side of the L-shaped baffle 13 is parallel to the driving blade shaft 31 or the driven blade shaft 32, the deformable head of the second sealing strip 14 is located in the gap between the baffle 13 and the driving blade shaft 31 or the driven blade shaft 32, and the horizontal side of the baffle 13 is jammed in the groove-shaped groove of the second sealing strip 14.

the operating handle 7 is inserted into the transmission mechanism 4, the transmission mechanism 4 rotates with the blades connected with the driving blade shaft 31 through the driving blade shaft 31, the driving blade shaft 31 fixed at the lower end of the blades rotates with the link mechanism 5, and the link mechanism 5 drives other blades to rotate through the driven blade shaft 32.

In the process of rotating all the blades, the first sealing strips on the inner side and the outer side of the middle blade box 34 are driven by the rotating force of the step-shaped folded edges 317 of the third folded edges 37 to be extruded into the gap between the two middle blade boxes 34 or the gap between the middle blade box 34 and the side blade boxes 33, so that the closer and tighter the blade assembly 3 is, the tightness of shutter closing is facilitated, when the deformable heads 39 of the first sealing strips in the middle blade boxes 34 are extruded into a 0 shape by the middle blade boxes or the side blade boxes on the adjacent sides, the blade assembly 3 is completely closed, and at the moment, the first sealing strips 38 and the gaps between the adjacent two blade boxes at the corresponding positions are just covered by the first protection folded edges 314 or the second protection folded edges 319 on the middle blade boxes 34 or the side blade boxes 33, so that the first sealing strips 38 are protected to prolong the service life of the shutter.

In the process of rotating all the blades, the first sealing strip on the side blade box 33 facing the window frame body 1 is driven by the rotation force to be extruded in the gaps among the window frame body 1, the baffle 13 and the side blade box 33 by the inner side of the window frame body 1, and after the side blade box 33 is completely closed, the deformable head of the first sealing strip is extruded into a 0 shape.

When the blade assembly 3 is fully closed, the deformable head of the second sealing strip 14 between each shutter 13 and its corresponding side blade cassette 33 or middle blade cassette 34 is deformed by compression.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.

Claims

1. The marine airtight shutter is characterized by comprising a window frame body fixed on a bulkhead, a water blocking grille embedded on the front surface of the window frame body and a blade assembly arranged in the window frame body, wherein an upper cavity is arranged at the top of the window frame body, a lower cavity is arranged at the bottom of the window frame body, a transmission mechanism is arranged in the upper cavity, a connecting rod mechanism is arranged in the lower cavity,

the blade assembly comprises a plurality of blades which are arranged side by side, wherein the upper end and the lower end of one blade are respectively connected with the transmission mechanism and the connecting rod mechanism through driving blade shafts, and driven blade shafts at the upper ends of other blades are embedded in the upper cavity, and driven blade shafts at the lower ends of the other blades are connected with the connecting rod mechanism;

the blade at the side of the blade assembly is a side blade box, the blade at the middle of the blade assembly is a middle blade box, the side blade box and the middle blade box comprise a first folded plate, a second folded plate, a third folded plate and a first sealing strip, the second folded plate is matched with the first folded plate so as to form a cavity between the two, the first sealing strip comprises a deformable head part and a clamping part extending and protruding from the deformable head part, the end part of the clamping part is bent to form a groove, the clamping part of the first sealing strip is attached to the second folded plate or the third folded plate, and the edge of the second folded plate or the third folded plate is clamped in the groove;

the shape of the first folded plate in the middle blade box is the same as that of the second folded plate, two end parts of a cavity formed by the first folded plate and the second folded plate in a butt joint mode are combined and sealed through a third folded plate and a first sealing strip, and the clamping part of the first sealing strip is attached to the third folded plate and enables the edge of the third folded plate to be clamped in the groove-shaped groove;

the first folded plate and the second folded plate are composed of a first U-shaped plate body with a flanging and a first protection folded edge arranged at one end of the first U-shaped plate body, the first protection folded edge is bent or bent in the opening direction of the first U-shaped plate body so as to shield and protect a first sealing strip when the shutter is closed, and a first installation shaft hole is formed in the middle of the first U-shaped plate body.

2. The marine airtight shutter is characterized by comprising a window frame body fixed on a bulkhead, a water blocking grille embedded on the front surface of the window frame body and a blade assembly arranged in the window frame body, wherein an upper cavity is arranged at the top of the window frame body, a lower cavity is arranged at the bottom of the window frame body, a transmission mechanism is arranged in the upper cavity, a connecting rod mechanism is arranged in the lower cavity,

the shape of the first folded plate in the side blade box is different from that of the second folded plate, the first end of the cavity formed by the first folded plate and the second folded plate in a involution mode is sealed only through a first sealing strip, and the second end of the cavity is sealed through a combination of the third folded plate and the first sealing strip;

the first folded plate consists of a second U-shaped plate body with a turned edge and a second protection folded edge arranged at one end part of the second U-shaped plate body, and the second protection folded edge is bent or bent towards the opening direction of the second U-shaped plate body so as to shield and protect the first sealing strip when the shutter is closed;

the second folded plate consists of a third U-shaped plate body with a turned edge and a mounting folded edge which is arranged at the first end of the third U-shaped plate body and used for enabling the edge of the third U-shaped plate body to be blocked in a groove of the first sealing strip;

the middle parts of the second U-shaped plate body and the third U-shaped plate body are respectively provided with a second installation shaft hole.

3. The marine closed shutter according to claim 1 or 2, wherein the third folded plate is composed of a fixed folded edge clamped in the first folded plate or the second folded plate and a step-shaped folded edge arranged at the root of the fixed folded edge, and the root of the step-shaped folded edge and the joint of the step-shaped folded edge and the fixed folded edge are all provided with arc-shaped rounded corners.

4. The marine airtight louver according to claim 1 or 2, wherein a plurality of baffles are arranged on the bottom surface of the upper cavity and the top surface of the lower cavity in a staggered manner, a second sealing strip with the same structure as the first sealing strip is arranged at each baffle,

the deformable head of the second sealing strip is positioned between the vertical edge of the baffle and the blade, and the horizontal edge of the baffle is blocked in the groove of the second sealing strip.

5. A method of using the marine blind of claim 1 or 2, comprising the steps of:

6. The method of claim 5, wherein the deformable heads of the second seal strip between each baffle and its corresponding side or middle blade case are deformed by compression during rotation of all the blades.