Fireproof watertight hatch cover with reinforced locking assembly

Abstract

The present invention relates to the technical field of marine equipment, and specifically to a fireproof and watertight hatch cover with a reinforced locking assembly, comprising a main body structure and a cover plate structure that cooperate with each other in opening and closing, a pressure-changing gasket is arranged on the main body structure, an air path inner channel is opened in the main body structure, a plug-in short pipe is arranged on the outside of the pressure-changing gasket, the pressure-changing gasket is sealed and connected to the air path inner channel through the plug-in short pipe, a pressing valve is fixedly arranged on the other end of the air path inner channel, an input screw sleeve is fixedly arranged on the pressing valve, and a compressed gas cylinder is spirally installed in the input screw sleeve; the hatch cover of the present invention makes it easier to open and close the hatch cover in daily use, and plays a basic function of preventing sea wave splashing; and when water flooding occurs, the pressure-changing gasket is automatically pressurized, so that the pressing fit between the cover plate structure and the pressure-changing gasket is tighter, and active reinforcement and locking are achieved.

Description

Technical Field

[0001] The invention relates to the technical field of marine equipment, in particular to a fireproof and watertight hatch cover with a reinforced locking assembly. Background Art

[0002] The hatch cover is a cover installed at the opening of the hull or cabin. Its main function is to close the hatch to ensure the tightness and safety of the hull. The hatch cover is usually composed of two parts, one is the main structure installed with the cabin, and the other is the cover structure that can close the main structure. Some hatch covers are sealed between the main structure and the cover structure by rubber gaskets. If you want to achieve a strong waterproof effect, the cover structure and the rubber gasket need to be pressed very tightly, which will make the hatch cover very laborious to open and close in daily use; and in actual use, the hatch cover mainly plays a role in preventing sea waves from splashing. Only in a few emergency situations will it be completely immersed in water, which requires a strong waterproof effect; hatch covers with lateral waterproof effects are laborious to open and close in daily use, while hatch covers that are easy to open and close laterally have insufficient water sealing performance in emergency situations. Summary of the invention

[0003] The object of the present invention is to provide a fireproof and watertight hatch cover with a reinforced locking assembly to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fireproof and watertight hatch cover with a reinforced locking assembly, comprising a main body structure and a cover plate structure that cooperate with each other in opening and closing, a pressure-changing gasket is arranged on the main body structure, an inner gas path is opened in the main body structure, a plug-in short pipe is arranged on the outside of the pressure-changing gasket, the pressure-changing gasket is sealed and connected to the inner gas path through the plug-in short pipe, a pressing valve is fixedly arranged on the other end of the inner gas path, an input screw sleeve is fixedly arranged on the pressing valve, a compressed gas cylinder is spirally installed in the input screw sleeve, a pressure gauge for displaying the pressure in the compressed gas cylinder is arranged on the pressing valve, a pressure-sensing automatic trigger mechanism is arranged on the outside of the pressing valve, and the pressure-sensing automatic trigger mechanism can automatically press the pressing valve to open under a certain water pressure, so that the compressed gas in the compressed gas cylinder enters the inner gas path through the pressing valve.

[0005] The pressure-sensitive automatic trigger mechanism includes a pressing shaft, a push rod, a spring disk and a positioning cover tube. The pressing shaft is installed on the pressing valve. When the pressing shaft is pressed, the pressing valve will be opened. A push rod is coaxially arranged below the pressing shaft. A spring disk is fixedly arranged at the lower end of the push rod. A positioning cover tube is fixedly arranged on the surface of the main body structure, and the spring disk is limitedly arranged in the positioning cover tube.

[0006] A pressing spring is provided in the positioning cover cylinder. The pressing spring is located below the spring disk. The pressing spring is in a compressed state. The thrust applied by the pressing spring to the spring disk is greater than the pressure required when the pressing shaft is pressed. A reset plate is fixedly provided on the surface of the spring disk. The reset plate extends to the outside of the positioning cover cylinder.

[0007] An unlocking frame is arranged above the positioning cover cylinder, a movable groove is opened in the unlocking frame, the push rod passes through the movable groove, a positioning lock shaft is fixedly arranged inside the movable groove, and the positioning lock shaft is inserted in the push rod to limit the push rod.

[0008] A sealing plug shaft is fixedly arranged on the unlocking frame, a pressure-sensitive cavity tube is fixedly arranged on the surface of the main body structure, a pressure-sensitive surface plate is airtightly and slidably arranged in the pressure-sensitive cavity tube, the sealing plug shaft seals and extends into the pressure-sensitive cavity tube and is fixedly connected to the pressure-sensitive surface plate, a limiting ring edge is fixedly arranged on the pressure-sensitive cavity tube, and the limiting ring edge is located on the side of the pressure-sensitive surface plate away from the sealing plug shaft.

[0009] A return spring is arranged on the side of the pressure-sensing surface plate facing the sealing plug shaft, and a one-way valve is embedded and installed on the pressure-sensing cavity tube. The one-way valve allows the airflow in the pressure-sensing cavity tube to flow to the outside in one direction through the one-way valve. An air inlet is opened on the pressure-sensing cavity tube, and a sealing screw cap is spirally closed on the air inlet.

[0010] An extension platform is fixedly arranged on the surface of the main body structure, an incremental air storage cavity and an exhaust cavity are opened in the extension platform, a normal air valve is embedded on the extension platform, and the incremental air storage cavity is connected with the exhaust cavity through the normal air valve.

[0011] A matching pressure plate is fixedly provided on the surface of the cover plate structure. When the cover plate structure is covered on the main body structure, the matching pressure plate will squeeze the valve button of the normal ventilation valve, so that the normal ventilation valve is in a closed state. At this time, the incremental air storage chamber and the exhaust chamber cannot be connected through the normal ventilation valve; when the matching pressure plate is separated from the normal ventilation valve, the normal ventilation valve is in a normally open state.

[0012] A branch cavity is provided in the main body structure, and the incremental air storage cavity is connected with the inner channel of the air path through the branch cavity. A flow-equalizing ring cavity is provided in the cover plate structure, and a gas supply hose is provided between the flow-equalizing ring cavity and the exhaust cavity. A beam exhaust slit is provided on the lower surface of the cover plate structure, and the lower part of the beam exhaust slit corresponds to the voltage-changing gasket, and the upper part is connected with the flow-equalizing ring cavity.

[0013] A spring-connected hinge is provided between the main body structure and the cover structure, a hand dial wheel is rotatably provided on the cover structure, a driving gear disc is fixedly provided on the hand dial wheel, a rack is meshed with the outside of the driving gear disc, a locking plug plate is fixedly provided on the end of the rack, and a matching lock edge is fixedly provided on the inner wall surface of the main body structure; by rotating the hand dial wheel, the rack can be driven by the driving gear disc, so that the locking plug plate is inserted under the matching lock edge, thereby locking.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The hatch cover of the present invention, through the cooperation of the provided variable pressure gasket, the push valve and the pressure-sensitive automatic trigger mechanism, can make the hatch cover easier to open and close in daily use, and play a basic function of preventing sea wave splashing; and when water flooding occurs, the variable pressure gasket is automatically pressurized, so that the pressure fit between the cover plate structure and the variable pressure gasket is tighter, and the locking is actively reinforced to improve the waterproof performance.

[0016] Through the coordination of the incremental air storage cavity, the constant air valve and the beam exhaust slit and other structures, after the water immersion is triggered, when the cover structure is opened, the residual pressure in the transformer gasket can be utilized to automatically dewater and clean the surface of the transformer gasket, thereby reducing the adhesion and immersion time of seawater on the surface of the transformer gasket and the influence of salt water on the service life of the rubber material of the transformer gasket; at the same time, the transformer gasket can be depressurized to the initial state, so that the cover structure can be easily opened and closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 It is a schematic diagram of the overall structure of the present invention from another angle.

[0019] Figure 3 for Figure 2 A magnified schematic diagram of area A in the middle.

[0020] Figure 4 It is a bottom view of the overall structure of the present invention.

[0021] Figure 5 It is a three-dimensional half-section schematic diagram of the present invention.

[0022] Figure 6 for Figure 5 Enlarged schematic diagram of area B in the middle.

[0023] Figure 7 It is a three-dimensional half-section front view of the present invention.

[0024] Figure 8 for Figure 7 Enlarged schematic diagram of area C in the middle.

[0025] Fig. 9 It is a three-dimensional half-section schematic diagram of the pressure-sensing cavity tube of the present invention.

[0026] Fig.10 for Fig. 9 Enlarged schematic diagram of area D in the middle.

[0027] In the figure: 1. body structure; 2. cover plate structure; 3. variable pressure gasket; 4. gas path; 5. plug-in short pipe; 6. pressing valve; 7. input screw sleeve; 8. compressed gas cylinder; 9. pressure gauge; 601. pressing shaft; 602. ejector rod; 603. spring plate; 604. positioning cover tube; 605. pressing spring; 606. reset plate; 607. unlocking frame; 608. moving groove; 609. positioning lock shaft; 610. sealing plug shaft; 611. pressure-sensitive cavity tube; 612. pressure-sensitive face plate; 613. limit Ring edge; 614, reset spring; 615, one-way valve; 616, air inlet; 617, sealing screw cap; 401, extension platform; 402, incremental air storage chamber; 403, exhaust chamber; 404, normal air valve; 405, matching pressure plate; 406, branch chamber; 407, gas supply hose; 408, flow-equalizing ring chamber; 409, beam exhaust slit; 201, spring connection hinge; 202, hand wheel; 203, drive gear disc; 204, rack; 205, locking plug plate; 206, matching lock edge. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] The present invention provides a technical solution: a fireproof watertight hatch cover with a reinforced locking assembly, such as Figure 5 As shown in FIG. , it includes a main body structure 1 and a cover plate structure 2 that are mutually opened and closed. Figure 6As shown in the figure, a transformer gasket 3 is provided on the main body structure 1, and the transformer gasket 3 is padded between the main body structure 1 and the cover plate structure 2. An air path 4 is opened in the main body structure 1, and a plug-in short tube 5 is provided for the external connection of the transformer gasket 3. The transformer gasket 3 is sealed and connected with the air path 4 through the plug-in short tube 5. In actual installation, glue can be coated on the surface of the plug-in short tube 5, and then inserted into the air path 4, and the plug-in short tube 5 and the air path 4 are fixed by glue to achieve a sealed connection between the plug-in short tube 5 and the air path 4. The other end of the gas circuit inner channel 4 is fixedly connected to a push valve 6, on which an input screw sleeve 7 is fixedly provided, and a compressed gas cylinder 8 is spirally installed in the input screw sleeve 7. The compressed gas cylinder 8 is a steel cylinder storing high-pressure gas under the prior art, and can be replaced after the compressed gas is exhausted or the pressure is lower than a certain interval. A pressure gauge 9 for displaying the pressure in the compressed gas cylinder 8 is provided on the push valve 6. The pressure condition in the compressed gas cylinder 8 can be judged by the pressure gauge 9. A pressure-sensitive automatic trigger mechanism is provided on the outside of the push valve 6. Under a certain water pressure, the pressure-sensitive automatic trigger mechanism can automatically press the push valve 6 to open, so that the compressed gas in the compressed gas cylinder 8 enters the gas circuit inner channel 4 through the push valve 6.

[0030] like Figure 6 As shown in the figure, the pressure-sensitive automatic trigger mechanism includes a pressing shaft 601, a push rod 602, a spring disk 603 and a positioning cover tube 604. The pressing shaft 601 is installed on the pressing valve 6. When the pressing shaft 601 is pressed, the pressing valve 6 will be opened. A push rod 602 is coaxially arranged below the pressing shaft 601, and a spring disk 603 is fixedly arranged at the lower end of the push rod 602. A positioning cover tube 604 is fixedly arranged on the surface of the main body structure 1, and the spring disk 603 is limitedly arranged in the positioning cover tube 604.

[0031] A pressing spring 605 is provided in the positioning cover tube 604. The pressing spring 605 is located below the spring disk 603. The pressing spring 605 is in a compressed state. The thrust applied by the pressing spring 605 to the spring disk 603 is greater than the pressure required when the pressing shaft 601 is pressed. A reset plate 606 is fixedly provided on the surface of the spring disk 603. The reset plate 606 extends to the outside of the positioning cover tube 604.

[0032] An unlocking frame 607 is arranged above the positioning cover tube 604, and a moving groove 608 is opened in the unlocking frame 607. The push rod 602 is inserted through the moving groove 608. A positioning lock shaft 609 is fixedly arranged inside the moving groove 608. The positioning lock shaft 609 is inserted in the push rod 602 to limit the push rod 602.

[0033] like Fig.10As shown in the figure, a sealing plug shaft 610 is fixedly provided on the unlocking frame 607, a pressure-sensing cavity tube 611 is fixedly provided on the surface of the main body structure 1, a pressure-sensing surface plate 612 is airtightly and slidably provided in the pressure-sensing cavity tube 611, the sealing plug shaft 610 seals and extends into the pressure-sensing cavity tube 611, and is fixedly connected to the pressure-sensing surface plate 612, a limiting ring edge 613 is fixedly provided on the pressure-sensing cavity tube 611, and the limiting ring edge 613 is located on the side of the pressure-sensing surface plate 612 away from the sealing plug shaft 610.

[0034] A return spring 614 is provided on the side of the pressure-sensing face plate 612 facing the sealing plug shaft 610, and a one-way valve 615 is embedded in the pressure-sensing cavity tube 611. The one-way valve 615 allows the airflow in the pressure-sensing cavity tube 611 to flow to the outside in one direction through the one-way valve 615. An air inlet 616 is opened on the pressure-sensing cavity tube 611, and a sealing screw cap 617 is spirally closed on the air inlet 616; the one-way valve 615 is one-way blocked by a small plugging piece, and the area of ​​the plugging piece is smaller than the area of ​​the pressure-sensing face plate 612. Under a certain water pressure, according to the pressure formula F=PS, it can be known that the pressure acts on the large-area pressure-sensing face plate 612, and the thrust generated must be greater than the thrust on the plugging piece. Therefore, the plugging piece will be pushed open by the gas, so that the gas in the pressure-sensing cavity tube 611 is discharged to the outside through the one-way valve 615.

[0035] like Figure 8 As shown in the figure, an extension platform 401 is fixedly provided on the surface of the main structure 1, an incremental air storage chamber 402 and an exhaust chamber 403 are opened in the extension platform 401, a normal air valve 404 is embedded on the extension platform 401, and the incremental air storage chamber 402 is connected with the exhaust chamber 403 through the normal air valve 404.

[0036] A matching pressure plate 405 is fixedly provided on the surface of the cover structure 2. When the cover structure 2 is covered on the main body structure 1, the matching pressure plate 405 will squeeze the valve button of the normal ventilation valve 404, so that the normal ventilation valve 404 is in a closed state. At this time, the incremental air storage chamber 402 and the exhaust chamber 403 cannot be connected through the normal ventilation valve 404; when the matching pressure plate 405 is separated from the normal ventilation valve 404, the normal ventilation valve 404 is in a normally open state.

[0037] A branch cavity 406 is provided in the main body structure 1, and the incremental air storage cavity 402 is connected with the air path 4 through the branch cavity 406. A flow equalizing annular cavity 408 is provided in the cover structure 2, and a gas hose 407 is provided between the flow equalizing annular cavity 408 and the exhaust cavity 403. A beam exhaust slit 409 is provided on the lower surface of the cover structure 2, and the lower part of the beam exhaust slit 409 corresponds to the voltage transformer gasket 3, and the upper part is connected with the flow equalizing annular cavity 408.

[0038] like Figure 5As shown in the figure, a spring-connected hinge 201 is provided between the main body structure 1 and the cover structure 2, a hand-push wheel 202 is rotatably provided on the cover structure 2, a driving gear disc 203 is fixedly provided on the hand-push wheel 202, a rack 204 is meshed with the outside of the driving gear disc 203, a locking plug plate 205 is fixedly provided on the end of the rack 204, and a matching lock edge 206 is fixedly provided on the inner wall surface of the main body structure 1; by rotating the hand-push wheel 202, the rack 204 can be driven by the driving gear disc 203, so that the locking plug plate 205 is inserted under the matching lock edge 206, thereby locking.

[0039] During daily use of the present invention, the transformer gasket 3 only plays a simple contact seal, and the contact pressure between the transformer gasket 3 and the cover structure 2 is relatively low. At this time, after the cover structure 2 is buckled, it is very easy to insert the locking plug plate 205 under the matching locking edge 206 for locking, without the need to press the cover structure 2 into place.

[0040] In flooding conditions, when the water depth reaches a certain value, such as Fig.10 As shown in , water pressure acts on the surface of the pressure-sensitive surface plate 612, pushing the pressure-sensitive surface plate 612 and the sealing plug shaft 610 to move. At this time, the gas in the pressure-sensitive cavity 611 will be discharged into the water through the one-way valve 615 to prevent the air pressure from affecting the movement of the pressure-sensitive surface plate 612; when the sealing plug shaft 610 moves, it can also drive the unlocking frame 607 to move, as shown in FIG. Figure 6 As shown in , at this time, the unlocking frame 607 drives the positioning lock shaft 609 to be pulled out from the push rod 602. At this time, the push rod 602 loses its limit and moves upward under the elastic force of the pressing spring 605, squeezing the pressing shaft 601, so that the pressing valve 6 is opened.

[0041] When the push valve 6 is opened, the compressed gas in the compressed gas cylinder 8 enters the gas path 4 through the push valve 6 and finally enters the pressure-changing gasket 3, causing the pressure-changing gasket 3 to expand, increasing the contact pressure with the cover plate structure 2 and improving the sealing performance.

[0042] At this time, a part of the compressed air flow will be diverted to the incremental air storage chamber 402 through the branch cavity 406 for temporary storage, increasing the air storage capacity. At this time, the constant air valve 404 is still in a closed state; when the water immersion subsides, the sealing screw cap 617 is unscrewed to allow air to enter the air inlet 616, and then the reset plate 606 is moved downward, the positioning lock shaft 609 will be reinserted into the top rod 602 to limit the position, and then the sealing screw cap 617 is screwed on to close the air inlet 616. At this time, the pressing valve 6 is closed, and the variable pressure gasket 3 and the incremental air storage chamber 402 still store compressed gas.

[0043] Lift up the cover structure 2. At the moment the cover structure 2 is just lifted up, the matching pressure plate 405 will separate from the normal ventilation valve 404, and the normal ventilation valve 404 will resume the normal ventilation state. At this time, the compressed gas stored in the transformer gasket 3 and the incremental air storage chamber 402 will pass through the normal ventilation valve 404, the exhaust cavity 403 and the gas delivery hose 407 into the flow-equalizing annular cavity 408, and be ejected through the beam exhaust slit 409. At this time, the cover structure 2 has just been lifted up at a small angle, and the high-pressure airflow ejected from the beam exhaust slit 409 can clear the seawater attached to the surface of the transformer gasket 3, reduce the influence of salt water on the service life of the rubber material of the transformer gasket 3, and at the same time, the transformer gasket 3 is restored to its initial state.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fireproof watertight hatch cover with a reinforced locking assembly, comprising a main body structure (1) and a cover plate structure (2) that cooperate with each other in opening and closing, characterized in that: The main body structure (1) is provided with a pressure-changing gasket (3), an air path (4) is provided in the main body structure (1), the outside of the pressure-changing gasket (3) is connected with a plug-in short tube (5), the pressure-changing gasket (3) is sealed and connected with the air path (4) through the plug-in short tube (5), the other end of the air path (4) is fixedly connected with a pressing valve (6), an input screw sleeve (7) is fixedly provided on the pressing valve (6), a compressed gas cylinder (8) is spirally connected and installed in the input screw sleeve (7), a pressure gauge (9) for displaying the pressure in the compressed gas cylinder (8) is provided on the pressing valve (6), and a pressure-sensitive automatic trigger mechanism is provided on the outside of the pressing valve (6), and the pressure-sensitive automatic trigger mechanism can automatically press the pressing valve (6) to open under a certain water pressure, so that the compressed gas in the compressed gas cylinder (8) enters the air path (4) through the pressing valve (6); An extension platform (401) is fixedly provided on the surface of the main body structure (1), and an incremental air storage chamber (402) and an exhaust chamber (403) are provided in the extension platform (401). A normal air valve (404) is embedded on the extension platform (401), and the incremental air storage chamber (402) is connected to the exhaust chamber (403) through the normal air valve (404); a matching pressure plate (405) is fixedly provided on the surface of the cover plate structure (2), and when the cover plate structure (2) is covered on the main body structure (1), the matching pressure plate (405) presses the valve button of the normal air valve (404), so that the normal air valve (404) is in a closed state, and at this time there is no air gap between the incremental air storage chamber (402) and the exhaust chamber (403). The method is to communicate with the normally vented air valve (404); when the matching pressure plate (405) is separated from the normally vented air valve (404), the normally vented air valve (404) is in a normally vented state; a branch cavity (406) is provided in the main body structure (1), and the incremental air storage cavity (402) is communicated with the inner channel (4) of the air path through the branch cavity (406); a flow equalizing annular cavity (408) is provided in the cover plate structure (2), and a gas supply hose (407) is provided between the flow equalizing annular cavity (408) and the exhaust cavity (403); a beam exhaust slit (409) is provided on the lower surface of the cover plate structure (2), and the lower part of the beam exhaust slit (409) corresponds to the voltage-changing gasket (3), and the upper part is communicated with the flow equalizing annular cavity (408).

2. A fireproof and watertight hatch cover with a reinforced locking assembly according to claim 1, characterized in that: The pressure-sensitive automatic trigger mechanism comprises a pressing shaft (601), a push rod (602), a spring disk (603) and a positioning cover tube (604); the pressing shaft (601) is mounted on the pressing valve (6); when the pressing shaft (601) is pressed, the pressing valve (6) is opened; a push rod (602) is coaxially arranged below the pressing shaft (601); a spring disk (603) is fixedly arranged at the lower end of the push rod (602); a positioning cover tube (604) is fixedly arranged on the surface of the main body structure (1); and the spring disk (603) is limitedly arranged in the positioning cover tube (604).

3. A fireproof and watertight hatch cover with a reinforced locking assembly according to claim 2, characterized in that: A pressing spring (605) is provided in the positioning cover tube (604), the pressing spring (605) is located below the spring disk (603), the pressing spring (605) is in a compressed state, the thrust applied by the pressing spring (605) to the spring disk (603) is greater than the pressure required when the pressing shaft (601) is pressed, and a reset plate (606) is fixedly provided on the surface of the spring disk (603), the reset plate (606) protruding to the outside of the positioning cover tube (604).

4. A fireproof and watertight hatch cover with a reinforced locking assembly according to claim 3, characterized in that: An unlocking frame (607) is arranged above the positioning cover tube (604), a movable groove (608) is provided in the unlocking frame (607), the push rod (602) is inserted through the movable groove (608), a positioning lock shaft (609) is fixedly arranged inside the movable groove (608), and the positioning lock shaft (609) is inserted into the push rod (602) to limit the position of the push rod (602).

5. A fireproof and watertight hatch cover with a reinforced locking assembly according to claim 4, characterized in that: A sealing plug shaft (610) is fixedly arranged on the unlocking frame (607), a pressure-sensing cavity tube (611) is fixedly arranged on the surface of the main body structure (1), a pressure-sensing surface plate (612) is airtightly and slidably arranged in the pressure-sensing cavity tube (611), the sealing plug shaft (610) is sealed and inserted into the pressure-sensing cavity tube (611), and is fixedly connected to the pressure-sensing surface plate (612), and a limiting ring edge (613) is fixedly arranged on the pressure-sensing cavity tube (611), and the limiting ring edge (613) is located on the side of the pressure-sensing surface plate (612) away from the sealing plug shaft (610).

6. A fireproof and watertight hatch cover with a reinforced locking assembly according to claim 5, characterized in that: A return spring (614) is arranged on the side of the pressure-sensing surface plate (612) facing the sealing plug shaft (610), and a one-way valve (615) is embedded in the pressure-sensing chamber tube (611). The one-way valve (615) allows the airflow in the pressure-sensing chamber tube (611) to flow to the outside in one direction through the one-way valve (615). An air inlet (616) is opened on the pressure-sensing chamber tube (611), and a sealing screw cap (617) is spirally sealed on the air inlet (616).

7. A fireproof and watertight hatch cover with a reinforced locking assembly according to claim 1, characterized in that: A spring connection hinge (201) is provided between the main body structure (1) and the cover plate structure (2); a hand wheel (202) is rotatably provided on the cover plate structure (2); a driving toothed disc (203) is fixedly provided on the hand wheel (202); a rack (204) is meshed with the outside of the driving toothed disc (203); a locking plug plate (205) is fixedly provided at the end of the rack (204); and a matching lock edge (206) is fixedly provided on the inner wall surface of the main body structure (1); the hand wheel (202) is rotated to drive the rack (204) through the driving toothed disc (203), so that the locking plug plate (205) is inserted under the matching lock edge (206), thereby locking.

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