Self-adaptive deck waterproof ventilation head and using method thereof

By designing an adaptive deck waterproof ventilator, the water collection bucket moves vertically along the guide mechanism, and automatically closes the airflow channel with the stroke compression mechanism, solving the problem of water inlet of the open-air deck ventilator in high sea conditions, and achieving both waterproofing and ventilation in harsh sea conditions.

CN120462622APending Publication Date: 2025-08-12CHINA SHIP DEV & DESIGN CENT

Patent Information

Application Number
CN202510849149.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-06-24
Publication Date
2025-08-12

AI Technical Summary

Technical Problem

The existing open-air deck ventilator is prone to water in high sea conditions, causing the cabin ventilation to be closed, affecting comfort and safety, and at the same time, the seafarers operate dangerously.

Method used

An adaptive deck waterproof vent head is designed, including an outer shell, inner cylinder, guide mechanism, water collection bucket and top cover. The water collection bucket moves vertically along the guide mechanism, and automatically closes the airflow channel in harsh sea conditions through the stroke compression mechanism to prevent water from entering the cabin.

Benefits of technology

Automatically close the airflow channel in harsh sea conditions to prevent water from entering the cabin, improve waterproof performance, ensure ventilation effect, and eliminate dangerous operation of seafarers, improving safety and comfort.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention discloses a self-adaptive deck waterproof ventilation head which comprises an outer shell, an inner barrel, a guide mechanism, a water collecting barrel and a top cover. The lower end of the outer shell is fixed on a ship deck; the upper portion of the inner barrel is located in the outer shell, and the lower portion of the inner barrel extends into a ship cabin. The lower end of the guide mechanism is fixed to the inner wall of the inner barrel, and the upper portion of the guide mechanism is connected with the water collecting barrel which vertically moves along the guide mechanism. An airflow channel is formed between the bottom of the water collecting cylinder and the upper port of the inner cylinder body; a top cover is arranged above the water collecting barrel, and an overflowing hole communicated with the water collecting barrel is formed in the top cover. The invention further discloses a using method of the self-adaptive deck waterproof ventilation head. The ventilation system has the beneficial effects that the water collecting barrel vertically moving along the guide mechanism is designed, under the severe sea condition, the water collecting barrel moves downwards to make contact with the upper end of the inner barrel body after collecting water, the airflow channel is closed, water is prevented from entering the cabin, and the waterproof performance of the whole ventilation system is improved.
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Description

Technical Field

[0001] The invention relates to a ship deck ventilation structure, and particularly to an adaptive deck waterproof ventilation head and a use method thereof. Background Art

[0002] In the field of ship navigation, ventilation heads installed on open decks are important equipment to ensure cabin air circulation. Under normal sea conditions, they can effectively realize air exchange between the inside and outside of the cabin, maintaining the comfort and safety of the air environment inside the cabin.

[0003] However, existing open-deck vents pose a constant risk of flooding during high sea conditions, necessitating the closure of these vents. However, this effectively shuts off ventilation to these cabins for the duration of the high sea conditions, reducing air circulation and impacting comfort and safety. Furthermore, existing open-deck vents lack an automatic closing function. In high sea conditions, these vents must be closed by seafarers on deck. During these times, the ship's violent rocking poses a significant risk of falling overboard. This not only endangers the lives of seafarers but also increases safety risks during navigation.

[0004] Therefore, there is an urgent need to develop a new ship ventilation head structure that can effectively prevent water ingress in high sea conditions while ensuring cabin ventilation and eliminating the need for seafarers to perform dangerous operations in high sea conditions. Summary of the Invention

[0005] The purpose of the present invention is to provide an adaptive deck waterproof vent head and a method of using the same, in order to improve the waterproof performance, in order to address the deficiencies of the existing technology.

[0006] The technical solution adopted by the present invention is: an adaptive deck waterproof ventilation head, comprising an outer shell, an inner cylinder, a guide mechanism, a water collecting bucket and a top cover; The outer shell and the inner cylinder are both opened at the top and bottom, and the lower end of the outer shell is fixed on the deck of the ship; The inner cylinder is coaxially arranged with the outer cylinder, the upper portion of the inner cylinder is located inside the outer cylinder, and the lower portion of the inner cylinder passes through the ship deck and extends into the ship cabin; The lower end of the guide mechanism is fixed to the inner wall of the inner cylinder, and the upper part of the guide mechanism passes through the upper end of the inner cylinder and is connected to the water collecting bucket provided above the inner cylinder. The water collecting bucket moves vertically along the guide mechanism. The outer edge of the bottom of the water collecting barrel exceeds the outer wall of the inner cylinder, and an air flow channel is formed between the bottom of the water collecting barrel and the upper end of the inner cylinder; a top cover is provided above the water collecting barrel, the top cover is fixed to the upper end of the guide mechanism, and a flow hole is opened on the top cover and communicated with the water collecting barrel; The top cover is located above the outer shell, and a gap for forming a vent is left between the top cover and the upper opening of the outer shell.

[0007] According to the above scheme, the adaptive deck waterproof ventilation head also includes a stroke compression mechanism, which is adapted to the guide mechanism; the lower end of the stroke compression mechanism is installed on the fixed rod, and the upper end of the stroke compression mechanism is connected to the water collecting bucket; the upper end of the stroke compression mechanism drives the water collecting bucket to move vertically along the guide mechanism.

[0008] According to the above solution, an annular sealing gasket is provided at the lower end of the water collecting bucket.

[0009] According to the above solution, the outer wall of the inner cylinder, the inner wall of the outer shell and the ship deck form a water storage tank.

[0010] According to the above solution, a drain pipe is provided at the bottom of the water collecting bucket, and the outlet end of the drain pipe is connected to the water storage tank.

[0011] According to the above scheme, the top cover includes a trumpet-shaped structure and an outer eaves plate; the lower end of the trumpet-shaped structure is connected to the upper end of the guide mechanism; the small mouth end of the trumpet-shaped structure is provided with an overflow hole, and the arc surface of the trumpet-shaped structure forms a guide surface; the large mouth end of the trumpet-shaped structure is provided with an annular outer eaves plate.

[0012] According to the above solution, a gap is left between the outer eaves plate and the baffle.

[0013] According to the above solution, the guide mechanism includes a stabilizing rod and a guide rod; The two ends of the stabilizing rod are respectively arranged inside the inner cylinder; the guide rod is vertically arranged, and the guide rod is respectively connected to the stroke compression mechanism, the water collecting bucket and the top cover.

[0014] According to the above solution, a drain outlet is provided at the lower portion of the water storage tank.

[0015] The present invention also adopts a method for using the above-mentioned adaptive deck waterproof vent head, which is: installing the adaptive deck waterproof vent head; Under normal sea conditions, the fan is started to work normally to ventilate the ship's cabins; When rainwater and / or seawater enters the adaptive deck waterproof ventilation head and the stroke compression mechanism is not pressed down, the adaptive deck waterproof ventilation head is in a non-submerged state, and the water flows into the water collecting bucket, the weight of the water collecting bucket increases, and at the same time, the water in the water collecting bucket is discharged through the drain outlet into the water storage tank and discharged through the drain outlet; when the water volume increases, the stroke compression mechanism is compressed and deformed by the water flow and the gravity of the water collecting bucket, the water collecting bucket descends, and the air flow channel area decreases; when the water volume continues to increase and the force borne by the stroke compression mechanism exceeds the applicable elastic force range of the stroke compression mechanism, the stroke compression mechanism is pressed down, and the water collecting bucket subsequently descends to contact with the upper end of the inner cylinder, and the air flow channel is completely closed to prevent water from entering the cabin.

[0016] The beneficial effects of the present invention are: 1. The present invention is designed with a water collecting bucket that moves vertically along a guide mechanism. In severe sea conditions, the water collecting bucket collects water and moves downward to contact the upper end of the inner cylinder, closing the air flow channel to prevent water from entering the cabin and improving the waterproof performance of the entire ventilation system.

[0017] 2. The present invention is designed with a stroke compression mechanism, and the water collecting bucket moves downward synchronously with the stroke compression mechanism. Under severe sea conditions, the water collecting bucket collects water, causing the compression mechanism to be compressed and deformed and automatically move downward. The water collecting bucket then moves downward until it contacts the upper end of the inner cylinder, closing the air flow channel, which can effectively prevent water from entering the cabin.

[0018] 3. In the present invention, the top cover is designed to be mushroom-shaped, and the water flow can be quickly drained into the water collection bucket along the trumpet-shaped structure, thereby increasing the response speed of the entire structure and further improving the waterproof performance.

[0019] 4. In the present invention, the guide mechanism can improve the stability of the entire structure.

[0020] 5. In the present invention, the lower end of the water collecting bucket is connected to the upper end of the inner cylinder through an annular sealing gasket, which improves the air tightness and has a strong waterproof ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of a ventilation mode according to a specific embodiment of the present invention.

[0022] Figure 2 Schematic diagram of the immersed state of this embodiment.

[0023] Figure 3 2 is a top view of the top cover in this embodiment.

[0024] Among them: 1. Inner cylinder; 2. Water collecting bucket; 3. Stroke compression mechanism; 4. Drain pipe; 5. Vacuum relief valve; 6. Outer shell; 7. Top cover; 8. Drain outlet; 9. Stabilizer bar; 10. Guide rod; 11. Ring sealing gasket; 12. Fixing rod; 13. Deck; 14. Inverted frustum structure; 15. External eaves plate; 16. Trumpet-shaped structure; 17. Baffle. DETAILED DESCRIPTION

[0025] To make the objectives, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0026] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0027] In the description of the embodiments of this application, it should be noted that, unless otherwise specified or limited, the terms "connected" and "connection" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art will understand the specific meanings of the above terms in the embodiments of this application based on the specific circumstances.

[0028] In the embodiments of the present application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, a first feature being "above," "above," and "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0029] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory. In addition, the term "plurality" means including two or more.

[0030] like Figure 1 and Figure 2An adaptive deck waterproof ventilator shown includes an outer shell 6, an inner cylinder 1, a guide mechanism, a water collection bucket 2 and a top cover 7; The outer shell 6 and the inner cylinder 1 are both opened at the top and bottom, and the lower end of the outer shell 6 is fixed on the ship deck 13; The inner cylinder 1 is coaxially arranged with the outer cylinder 6, the upper portion of the inner cylinder 1 is located inside the outer cylinder 6, and the lower portion of the inner cylinder 1 passes through the ship deck 13 and extends into the ship cabin; The lower end of the guide mechanism is fixed to the inner wall of the inner cylinder 1, and the upper part of the guide mechanism passes through the upper end of the inner cylinder 1 and is connected to the water collecting bucket 2 provided above the inner cylinder 1. The water collecting bucket 2 can move vertically along the guide mechanism; The outer edge of the bottom of the water collecting barrel 2 exceeds the outer wall of the inner cylinder 1, and an air flow channel is formed between the bottom of the water collecting barrel and the upper end of the inner cylinder 1; a top cover 7 is provided above the water collecting barrel 2, and the top cover 7 is fixed to the upper end of the guide mechanism; a flow hole is opened on the top cover 7 and communicated with the water collecting barrel 2; The top cover 7 is located above the outer shell 6 , and a gap is left between the top cover 7 and the upper opening of the outer shell 6 to form a ventilation hole.

[0031] In the present invention, when in ventilation mode, the water collecting bucket 2 is located above the inner cylinder 1, the two are not in contact, the air flow channel is open, and the ship cabin can be ventilated using the adaptive deck waterproof ventilation head; when in severe sea conditions, the water collecting bucket 2 moves downward along the guide mechanism until it contacts the upper port of the inner cylinder 1, and the air flow channel is closed to prevent external water from entering the ship cabin.

[0032] In the present invention, the upper port of the inner cylinder 1 is expanded outward, and the outer diameter of the upper port is enlarged to increase the area of the air flow channel.

[0033] Preferably, the adaptive deck waterproof ventilation head also includes a stroke compression mechanism 3, which is adapted to the guide mechanism; the lower end of the stroke compression mechanism 3 is installed on the fixed rod 12, and the upper end of the stroke compression mechanism 3 is connected to the water collecting bucket 2; the upper end of the stroke compression mechanism 3 can drive the water collecting bucket 2 to move vertically along the guide mechanism.

[0034] In this invention, the stroke compression mechanism 3 is a stainless steel spring, the top of which is connected to the bottom of the water collection bucket 2. When the spring is compressed, it drives the water collection bucket 2 downward. The two ends of the fixing rod 12 are fixedly connected to the inner wall of the inner cylinder 1. The upper end of the stroke compression mechanism 3 is provided with an inverted frustum structure 14 to increase the contact area between the stroke compression mechanism 3 and the water collection bucket 2 and improve the stability of the connection.

[0035] Preferably, an annular sealing gasket 11 is provided at the lower end of the water collecting bucket 2 .

[0036] In the present invention, when in severe sea conditions, the water collecting bucket 2 is connected to the upper end of the inner cylinder 1 through the annular sealing gasket 11 to improve the sealing performance and prevent water from entering the ship's cabin.

[0037] Preferably, the outer wall of the inner cylinder 1, the inner wall of the outer shell 6 and the ship deck 13 form a water storage tank; a drain outlet 8 is provided at the lower portion of the water storage tank.

[0038] Preferably, a drain pipe 4 is provided at the bottom of the water collecting barrel 2, and the outlet end of the drain pipe 4 is connected to the water storage tank.

[0039] In the present invention, the water in the water collecting bucket 2 can enter the water storage tank through the drain pipe 4 and be discharged through the drain port 8.

[0040] Preferably, if Figure 3 As shown, the top cover 7 is a mushroom head structure, including a trumpet-shaped structure 16 and an outer eaves plate 15; the lower end of the trumpet-shaped structure 16 is connected to the upper end of the guide mechanism; the small mouth end of the trumpet-shaped structure 16 is provided with a flow hole, and the arc surface of the trumpet-shaped structure 16 forms a guide surface; the large mouth end of the trumpet-shaped structure 16 is provided with an annular outer eaves plate 15.

[0041] In the present invention, seawater or rainwater is guided through the surface of the trumpet-shaped structure 16 of the top cover 7 and flows into the water collection barrel 2 through the flow holes.

[0042] Preferably, an inclined baffle is provided at the upper end of the outer shell 6 , and a gap is left between the outer eaves plate 15 and the baffle 17 .

[0043] In the present invention, the gap between the outer eaves plate 15 and the baffle 17 forms a vent.

[0044] Preferably, the guide mechanism includes a stabilizing rod 9 and a guide rod 10; The two ends of the stabilizing rod 9 are respectively arranged inside the inner cylinder 1; the guide rod 10 is vertically arranged, and the guide rod 10 is respectively connected to the stroke compression mechanism 3, the water collecting bucket 2 and the top cover 7.

[0045] In the present invention, the driving end of the stroke compression mechanism 3 drives the water collecting bucket 2 to move vertically along the guide rod 10 .

[0046] Preferably, a vacuum relief valve 5 is provided at the lower portion of the inner cylinder 1 , and the vacuum relief valve 5 is connected to the fan through a pipeline.

[0047] In the present invention, under normal sea conditions, the fan is started to ventilate the ship's cabin.

[0048] A method for using the adaptive deck waterproof ventilator as described above, the method comprising: installing the adaptive deck waterproof vent head; Under normal sea conditions, the adaptive deck waterproof ventilation head is in ventilation mode, the fan is started to work normally, the ship's cabin is ventilated, the stroke compression mechanism 3 is in the maximum stroke (uncompressed), the water collecting bucket 2 is located at the highest position above the inner cylinder 1, the bottom of the water collecting bucket 2 does not contact the upper end of the inner cylinder 1, the air flow channel is maximized, and the air in the ship's cabin is discharged to the outside of the ship for ventilation through the adaptive deck waterproof ventilation head. Figure 1 As shown; Under severe sea conditions, rainwater and / or seawater enters the adaptive deck waterproof ventilation head. When the water volume is small and the stroke compression mechanism 3 does not press down, the adaptive deck waterproof ventilation head is in a non-submerged state (the adaptive deck waterproof ventilation head has not completely entered the water). The water flows into the water collecting bucket 2 through the flow hole under the guidance of the trumpet-shaped structure 16 of the top cover 7. The weight of the water collecting bucket 2 increases, and at the same time, the water in the water collecting bucket 2 is discharged through the drain port 8 into the water storage tank and discharged through the drain port 8; when the water volume increases, the stroke compression mechanism 3 is compressed and deformed by the water flow and the gravity of the water collecting bucket 2, and the water collecting bucket 2 drops to reach the equilibrium point. At this time, the area of the air flow channel decreases; when the water volume continues to increase and the force borne by the stroke compression mechanism 3 exceeds the applicable elastic force range of the stroke compression mechanism 3, the stroke compression mechanism 3 presses down, and the water collecting bucket 2 subsequently drops to contact with the upper end of the inner cylinder 1. The annular sealing gasket 11 plays a sealing role, the upper port of the inner cylinder 1 is closed, and the air flow channel is completely closed to prevent water from entering the cabin. At this time, the adaptive deck waterproof ventilation head is in a submerged state. Figure 2 shown.

[0049] In the present invention, the vacuum relief valve 5 is linked to the fan. That is, when a person operates the fan starter to start the fan, a signal is simultaneously transmitted to the vacuum relief valve 5, causing it to open. When the fan stops, the vacuum relief valve 5 also receives a closing signal, closing the pressure relief valve. When water no longer flows into the adaptive deck waterproof vent after a severe operating condition, the fan connected to the vacuum relief valve 5 is activated, introducing air into the inner cylinder 1 of the adaptive deck waterproof vent, breaking the vacuum atmosphere within the cylinder. At this point, the stroke compression mechanism 3 is restored by the air, the water collection bucket 2 rises, the airflow channel opens, and the adaptive deck waterproof vent enters ventilation mode.

[0050] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0051] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An adaptive deck waterproof ventilator, characterized in that: It includes an outer shell, an inner cylinder, a guide mechanism, a water collecting bucket and a top cover; The outer shell and the inner cylinder are both opened at the top and bottom, and the lower end of the outer shell is fixed on the deck of the ship; The inner cylinder is coaxially arranged with the outer cylinder, the upper portion of the inner cylinder is located inside the outer cylinder, and the lower portion of the inner cylinder passes through the ship deck and extends into the ship cabin; The lower end of the guide mechanism is fixed to the inner wall of the inner cylinder, and the upper part of the guide mechanism passes through the upper end of the inner cylinder and is connected to the water collecting bucket provided above the inner cylinder. The water collecting bucket moves vertically along the guide mechanism. The outer edge of the bottom of the water collecting barrel exceeds the outer wall of the inner cylinder, and an air flow channel is formed between the bottom of the water collecting barrel and the upper end of the inner cylinder; a top cover is provided above the water collecting barrel, the top cover is fixed to the upper end of the guide mechanism, and a flow hole is opened on the top cover and communicated with the water collecting barrel; The top cover is located above the outer shell, and a gap for forming a vent is left between the top cover and the upper opening of the outer shell.

2. The adaptive deck waterproof ventilator according to claim 1, characterized in that: The adaptive deck waterproof ventilation head also includes a stroke compression mechanism, which is adapted to the guide mechanism; the lower end of the stroke compression mechanism is installed on the fixed rod, and the upper end of the stroke compression mechanism is connected to the water collecting bucket; the upper end of the stroke compression mechanism drives the water collecting bucket to move vertically along the guide mechanism.

3. The adaptive deck waterproof ventilator according to claim 1, characterized in that: An annular sealing gasket is provided at the lower end of the water collecting bucket.

4. The adaptive deck waterproof ventilator according to claim 1, characterized in that: The outer wall of the inner cylinder, the inner wall of the outer shell and the ship deck together form a water storage tank.

5. The adaptive deck waterproof ventilator according to claim 4, characterized in that: A drainage pipe is provided at the bottom of the water collecting barrel, and the outlet end of the drainage pipe is communicated with the water storage tank.

6. The adaptive deck waterproof ventilator according to any one of claims 1 to 5, characterized in that: The top cover includes a trumpet-shaped structure and an outer eaves plate; the lower end of the trumpet-shaped structure is connected to the upper end of the guide mechanism; the small mouth end of the trumpet-shaped structure is provided with an overflow hole, and the arc surface of the trumpet-shaped structure forms a guide surface; the large mouth end of the trumpet-shaped structure is provided with an annular outer eaves plate.

7. The adaptive deck waterproof ventilator according to claim 6, characterized in that: A gap is left between the outer eaves plate and the baffle.

8. The self-adaptive deck waterproof ventilator according to claim 1, wherein: The guide mechanism includes a stabilizing rod and a guide rod; The two ends of the stabilizing rod are respectively arranged inside the inner cylinder; the guide rod is vertically arranged, and the guide rod is respectively connected to the stroke compression mechanism, the water collecting bucket and the top cover.

9. The adaptive deck waterproof ventilator according to claim 4, characterized in that: A drain outlet is provided at the lower portion of the water storage tank.

10. A method for using the adaptive deck waterproof ventilator as claimed in claim 2, characterized in that: The method is: installing the adaptive deck waterproof vent head; Under normal sea conditions, the fan is started to work normally to ventilate the ship's cabins; When rainwater and / or seawater enters the adaptive deck waterproof ventilation head and the stroke compression mechanism is not pressed down, the adaptive deck waterproof ventilation head is in a non-submerged state, and the water flows into the water collecting bucket, the weight of the water collecting bucket increases, and at the same time, the water in the water collecting bucket is discharged through the drain outlet into the water storage tank and discharged through the drain outlet; when the water volume increases, the stroke compression mechanism is compressed and deformed by the water flow and the gravity of the water collecting bucket, the water collecting bucket descends, and the air flow channel area decreases; when the water volume continues to increase and the force borne by the stroke compression mechanism exceeds the applicable elastic force range of the stroke compression mechanism, the stroke compression mechanism is pressed down, and the water collecting bucket subsequently descends to contact with the upper end of the inner cylinder, and the air flow channel is completely closed to prevent water from entering the cabin.

Citation Information

Patent Citations

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  • Device for automatically preventing seawater from entering marine ventilator

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