Dangerous gas isolation device for ships and dangerous gas isolation protection method

Abstract

The present invention discloses a hazardous gas isolation device for ships and a hazardous gas isolation protection method. The hazardous gas isolation device for ships has a safety door assembly distributed in the first cabin, and the safety door assembly includes a door frame structure located at the opening and fixedly connected to the deck, and a door leaf structure hinged to the door frame structure. The door leaf structure can be locked to the door frame structure and close the opening, and when the door leaf structure is locked to the door frame structure, the door frame structure and the door leaf structure form an annular closed air cavity, which surrounds the periphery of the opening and is spaced apart from the opening; the isolation protection assembly includes a pressure difference sensor and an inflation assembly, the pressure difference sensor is used to monitor the pressure difference between the annular closed air cavity and the second cabin, and the inflation assembly is used to inflate the annular closed air cavity. Compared with the hazardous gas isolation device in the prior art, the structure is simple, the explosion-proof sensitivity is high, and the use safety of the ship is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of ships, and in particular to a hazardous gas isolation device for ships and a hazardous gas isolation protection method. Background Art

[0002] Ships, especially ro-ro ships and ro-ro passenger ships, have vehicles or other ro-ro cargoes loaded in the cargo hold area, which may cause the escape of dangerous gases. Since the density of dangerous gases is usually greater than that of air, they tend to gather at the bottom of the cargo hold area, that is, near the deck of the cargo area. Therefore, the height range above the deck of the cargo hold area that is not higher than the set height value is defined as a Class 1 explosion-proof hazardous area, and the area adjacent to the Class 1 explosion-proof hazardous area and connected by an opening is defined as an extended explosion-proof hazardous area. Specifically, many equipment rooms, storage rooms, control stations, etc. need to be set up in the area adjacent to the cargo hold area, and need to enter and exit from the cargo hold area, which inevitably requires these rooms to be set up with openings to connect with the cargo hold area, so that the areas where these rooms are located are all extended explosion-proof hazardous areas.

[0003] In order to prevent the dangerous gas in the cargo hold area from leaking into safe areas such as equipment rooms, storage rooms and control stations, a dangerous gas isolation device is usually set in the prior art. However, the dangerous gas isolation device in the prior art has a complex structure, low explosion-proof sensitivity and poor safety. Summary of the invention

[0004] The purpose of the present invention is to provide a hazardous gas isolation device for ships and a hazardous gas isolation protection method to solve the problems of complicated structure, low explosion-proof sensitivity and poor safety of hazardous gas isolation devices for ships in the prior art.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A hazardous gas isolation device for a ship, the ship comprising a first cabin, a second cabin and a deck, the deck separating the first cabin from the second cabin, and the deck being provided with an opening connecting the first cabin and the second cabin, the hazardous gas isolation device for a ship comprising:

[0007] A safety door assembly distributed in the first cabin, the safety door assembly comprising a door frame structure located at the opening and fixedly connected to the deck, and a door leaf structure hinged to the door frame structure, the door leaf structure can be locked to the door frame structure and close the opening, and when the door leaf structure is locked to the door frame structure, the door frame structure and the door leaf structure form an annular closed air cavity, the annular closed air cavity surrounds the periphery of the opening and is spaced apart from the opening;

[0008] An isolation protection component, the isolation protection component includes a pressure difference sensor and an inflation component, the pressure difference sensor is used to monitor the pressure difference between the annular closed air cavity and the second cabin, and the inflation component is used to inflate the annular closed air cavity.

[0009] As a preferred solution of the above-mentioned hazardous gas isolation device for ships, the inflation component includes a compressed gas cylinder and a first control valve, and the gas outlet of the compressed gas cylinder, the first control valve and the annular closed air cavity are connected in sequence.

[0010] As a preferred solution of the above-mentioned hazardous gas isolation device for ships, the inflation component also includes a second control valve and a gas source, and the gas source, the second control valve and the gas replenishing port of the compressed gas cylinder are connected in sequence.

[0011] As a preferred solution of the above-mentioned hazardous gas isolation device for ships, the inflation component includes a fan, and the air outlet of the fan is connected to the annular closed air cavity through an inflation pipe.

[0012] As a preferred embodiment of the above-mentioned hazardous gas isolation device for ships, the door frame structure includes a door frame bottom plate located at the opening and fixedly connected to the deck, and a door frame enclosure plate fixedly connected to the periphery of the door frame bottom plate, and the door leaf structure includes a connected door leaf outer plate and a door leaf inner plate. When the door leaf structure is locked to the door frame structure, the door frame bottom plate, the door frame enclosure plate, the door leaf outer plate and the door leaf inner plate form the annular closed air cavity.

[0013] As a preferred solution of the above-mentioned hazardous gas isolation device for ships, a first sealing ring is provided in one of the door frame bottom plate and the door leaf inner plate. When the door leaf structure is locked to the door frame structure, the first sealing ring is used to seal the gap between the door frame bottom plate and the door leaf inner plate.

[0014] As a preferred solution of the above-mentioned hazardous gas isolation device for ships, one of the door frame panel and the door leaf outer panel is provided with a second sealing ring, and when the door leaf structure is locked to the door frame structure, the second sealing ring is used to seal the gap between the door frame panel and the door leaf outer panel.

[0015] A hazardous gas isolation protection method is used to be implemented in the above-mentioned hazardous gas isolation device for ships, and the hazardous gas isolation protection method comprises:

[0016] When the door leaf structure is locked to the door frame structure, obtaining the pressure difference between the annular closed air cavity and the second cabin;

[0017] Determining whether the pressure difference between the annular closed air cavity and the second cabin is within a set pressure difference range;

[0018] If the pressure difference between the annular closed air cavity and the second cabin is less than the minimum value of the set pressure difference range, the inflation component is controlled to inflate into the annular closed air cavity until the pressure difference between the annular closed air cavity and the second cabin is greater than the maximum value of the set pressure difference range, and then the inflation component is controlled to stop inflating.

[0019] As a preferred solution of the above-mentioned hazardous gas isolation protection method, after controlling the inflation component to stop inflation, the following steps are also included:

[0020] acquiring the pressure difference between the annular closed air cavity and the second cabin in real time;

[0021] Determining whether the pressure difference between the annular closed air cavity and the second cabin is less than the minimum value of the set pressure difference range;

[0022] If the pressure difference between the annular closed air cavity and the second cabin is less than the minimum value of the set pressure difference range, then start timing and count it as the timing duration;

[0023] Determine whether the timing duration is greater than or equal to a first set duration;

[0024] If the timing duration is greater than or equal to the first set duration, the control generates an alarm.

[0025] As a preferred solution of the above-mentioned hazardous gas isolation protection method, the control further includes the following steps after the alarm is issued:

[0026] Determine whether the timing duration is greater than or equal to a second set duration;

[0027] If the timing duration is greater than or equal to the second set duration, control to cut off the power supply of the non-explosion-proof electrical equipment in the first cabin;

[0028] The first set duration is shorter than the second set duration.

[0029] Beneficial effects of the present invention:

[0030] The object of the present invention is to provide a hazardous gas isolation device for ships and a hazardous gas isolation protection method. The ship includes a first cabin, a second cabin and a deck. The deck separates the first cabin and the second cabin, and the deck is provided with an opening connecting the first cabin and the second cabin. The hazardous gas isolation device for ships includes a safety door assembly distributed in the first cabin, the safety door assembly includes a door frame structure located at the opening and fixedly connected to the deck, and a door leaf structure hinged to the door frame structure, the door leaf structure can be locked to the door frame structure and close the opening, and when the door leaf structure is locked to the door frame structure, the door frame structure and the door leaf structure form an annular closed air cavity, the annular closed air cavity surrounds the periphery of the opening and is spaced apart from the opening; the hazardous gas isolation device for ships also includes an isolation protection assembly, the isolation protection assembly includes a pressure difference sensor and an inflation assembly, the pressure difference sensor is used to monitor the pressure difference between the annular closed air cavity and the second cabin, and the inflation assembly is used to inflate the annular closed air cavity.

[0031] When the door leaf structure is locked to the door frame structure and the opening is closed, the pressure difference between the annular closed air cavity and the second cabin is monitored by the pressure difference sensor. If the pressure difference between the annular closed air cavity and the second cabin is less than the minimum value of the set pressure difference range, the inflation component is controlled to inflate the annular closed air cavity until the pressure difference between the annular closed air cavity and the second cabin is greater than the maximum value of the set pressure difference range, and the inflation component is controlled to stop inflating. It can be understood that the air pressure value of the first cabin and the air pressure value of the second cabin are both normal atmospheric pressure. At this time, the air pressure value of the annular closed air cavity is greater than the normal atmospheric pressure, so that the gap between the door leaf structure and the door frame structure can be effectively sealed to prevent the dangerous gas in the second cabin from infiltrating into the first cabin through the gap between the door leaf structure and the door frame structure; it can be understood that after the inflation component stops inflating, the pressure difference between the annular closed air cavity and the second cabin can be monitored in real time by the pressure difference sensor. If it is monitored that the pressure difference between the annular closed air cavity and the second cabin is less than the minimum value of the set pressure difference range, further alarm or explosion-proof measures can be taken. Such a configuration has a simple structure and high explosion-proof sensitivity compared to the hazardous gas isolation device in the prior art, which effectively improves the safety of ship use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural schematic diagram of a hazardous gas isolation device for a ship provided by a specific embodiment of the present invention being assembled on a deck;

[0033] Figure 2 It is a schematic structural diagram of a hazardous gas isolation device for a ship provided by another embodiment of the present invention, which is installed on a deck.

[0034] In the figure:

[0035] 110, first cabin; 120, second cabin; 130, deck; 131, opening;

[0036] 1. Door frame structure; 11. Door frame bottom plate; 12. Door frame enclosure; 13. First sealing ring; 14. Second sealing ring;

[0037] 2. Door leaf structure; 21. Door leaf outer panel; 22. Door leaf inner panel;

[0038] 3. Annular closed air cavity;

[0039] 4. Differential pressure sensor;

[0040] 5. Inflatable component; 51. Compressed gas cylinder; 52. First control valve; 53. Second control valve; 54. Fan; 55. Inflatable tube. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0042] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0045] like Figure 1 and Figure 2 As shown, the present invention provides a hazardous gas isolation device for a ship, wherein the ship comprises a first cabin 110, a second cabin 120 and a deck 130, wherein the deck 130 separates the first cabin 110 and the second cabin 120, and the deck 130 is provided with an opening 131 connecting the first cabin 110 and the second cabin 120. The hazardous gas isolation device for ships includes a safety door assembly distributed in the first cabin 110, the safety door assembly includes a door frame structure 1 located at the opening 131 and fixedly connected to the deck 130, and a door leaf structure 2 hinged to the door frame structure 1, the door leaf structure 2 can be locked to the door frame structure 1 and close the opening 131, and when the door leaf structure 2 is locked to the door frame structure 1, the door frame structure 1 and the door leaf structure 2 form an annular closed air cavity 3, the annular closed air cavity 3 surrounds the periphery of the opening 131 and is spaced from the opening 131; the hazardous gas isolation device for ships also includes an isolation protection assembly, the isolation protection assembly includes a pressure difference sensor 4 and an inflation assembly 5, the pressure difference sensor 4 is used to monitor the pressure difference between the annular closed air cavity 3 and the second cabin 120, and the inflation assembly 5 is used to inflate the annular closed air cavity 3. It can be understood that there is hazardous gas in the second cabin 120.

[0046] like Figure 1 and Figure 2As shown, when the door leaf structure 2 is locked to the door frame structure 1 and the opening 131 is closed, the pressure difference between the annular closed air cavity 3 and the second cabin 120 is monitored by the pressure difference sensor 4. If the pressure difference between the annular closed air cavity 3 and the second cabin 120 is less than the minimum value of the set pressure difference range, the inflation component 5 is controlled to inflate the annular closed air cavity 3 until the pressure difference between the annular closed air cavity 3 and the second cabin 120 is greater than the maximum value of the set pressure difference range, and the inflation component 5 is controlled to stop inflating. It can be understood that the air pressure value of the first cabin 110 and the air pressure value of the second cabin 120 are both normal atmospheric pressure. At this time, the air pressure value of the annular closed air cavity 3 is greater than the normal atmospheric pressure, so that the gap between the door leaf structure 2 and the door frame structure 1 can be effectively sealed to prevent the dangerous gas in the second cabin 120 from penetrating into the first cabin 110 through the gap between the door leaf structure 2 and the door frame structure 1; it can be understood that when the inflation component 5 stops inflating, the pressure difference between the annular closed air cavity 3 and the second cabin 120 can also be monitored in real time through the pressure difference sensor 4. If the pressure difference between the annular closed air cavity 3 and the second cabin 120 is less than the minimum value of the set pressure difference range, further alarm or explosion-proof measures can be taken. Such a setting has a simple structure and high explosion-proof sensitivity compared to the dangerous gas isolation device in the prior art, which effectively improves the safety of ship use.

[0047] Among them, Figure 1 As shown, the inflation assembly 5 includes a compressed gas cylinder 51 and a first control valve 52, and the gas outlet of the compressed gas cylinder 51, the first control valve 52 and the annular closed air cavity 3 are connected in sequence. Specifically, the hazardous gas isolation device for ships also includes a controller, and the controller is electrically connected to the pressure difference sensor 4 and the first control valve 52, and the controller can control the operation of the first control valve 52 according to the electrical signal sent by the pressure difference sensor 4. Specifically, when the pressure difference between the annular closed air cavity 3 and the second cabin 120 is less than the minimum value of the set pressure difference range, the controller controls the first control valve 52 to connect the gas outlet of the compressed gas cylinder 51 and the annular closed air cavity 3, so that the compressed gas cylinder 51 inflates the annular closed air cavity 3, until the pressure difference between the annular closed air cavity 3 and the second cabin 120 is greater than the maximum value of the set pressure difference range, the controller controls the first control valve 52 to stop inflation. Preferably, the first control valve 52 is a switch valve.

[0048] Specifically, Figure 1 As shown, the inflation assembly 5 further includes a second control valve 53 and an air source, and the air source, the second control valve 53 and the air supply port of the compressed gas cylinder 51 are connected in sequence. Preferably, the second control valve 53 is an automatic pressure valve. When the air pressure in the compressed gas cylinder 51 is lower than a set value, the second control valve 53 connects the air source and the air supply port of the compressed gas cylinder 51 to achieve automatic air supply to the compressed gas cylinder 51.

[0049] The preferred gas source is the compressed gas output by the compressed air system on the ship. This arrangement can save energy.

[0050] As an alternative, Figure 2 As shown, the inflation assembly 5 includes a fan 54, and the air outlet of the fan 54 is connected to the annular closed air cavity 3 through the inflation tube 55. The controller is electrically connected to the fan 54, and the controller controls the fan 54 to work according to the electrical signal sent by the pressure difference sensor 4. When the pressure difference between the annular closed air cavity 3 and the second cabin 120 is less than the minimum value of the set pressure difference range, the controller controls the fan 54 to inflate the annular closed air cavity 3 until the pressure difference between the annular closed air cavity 3 and the second cabin 120 is greater than the maximum value of the set pressure difference range, and the controller controls the fan 54 to stop inflating.

[0051] Among them, Figure 1 and Figure 2 As shown, the door frame structure 1 includes a door frame bottom plate 11 located at the opening 131 and fixedly connected to the deck 130, and a door frame enclosure 12 fixedly connected to the periphery of the door frame bottom plate 11, and the door leaf structure 2 includes a door leaf outer plate 21 and a door leaf inner plate 22 connected to each other. When the door leaf structure 2 is locked to the door frame structure 1, the door frame bottom plate 11, the door frame enclosure 12, the door leaf outer plate 21 and the door leaf inner plate 22 form an annular closed air cavity 3. In this way, the first cabin 110 and the second cabin 120 can be isolated by the annular closed air cavity 3 and the door frame structure 1.

[0052] Specifically, Figure 1 and Figure 2 As shown, one of the door frame bottom plate 11 and the door leaf inner plate 22 is provided with a first sealing ring 13. When the door leaf structure 2 is locked to the door frame structure 1, the first sealing ring 13 is used to seal the gap between the door frame bottom plate 11 and the door leaf inner plate 22. One of the door frame enclosure 12 and the door leaf outer plate 21 is provided with a second sealing ring 14. When the door leaf structure 2 is locked to the door frame structure 1, the second sealing ring 14 is used to seal the gap between the door frame enclosure 12 and the door leaf outer plate 21. In this way, the annular closed air cavity 3 formed can be sealed, which is convenient for inflating the annular closed air cavity 3.

[0053] Specifically, Figure 1 and Figure 2 As shown, it is exemplified that the first sealing ring 13 is partially embedded in the door frame bottom plate 11 and the second sealing ring 14 is partially embedded in the door frame enclosure 12 .

[0054] Specifically, the first sealing ring 13 and the second sealing ring 14 are both made of rubber material.

[0055] The hazardous gas isolation device for ships also includes an alarm, and the controller is also electrically connected to the alarm and the non-explosion-proof electrical equipment in the first cabin 110. When the inflation assembly 5 stops inflating, the pressure difference between the annular closed air cavity 3 and the second cabin 120 is monitored in real time through the pressure difference sensor 4. If the pressure difference between the annular closed air cavity 3 and the second cabin 120 is less than the minimum value of the set pressure difference range, the timing starts. When the timing duration is greater than or equal to the first set duration, the controller controls the alarm to sound an alarm to remind the staff on the ship that there is a risk of dangerous gas leaking from the second cabin 120 to the first cabin 110. When the timing duration is greater than or equal to the second set duration, the controller controls the power supply of the non-explosion-proof electrical equipment in the first cabin 110 to prevent the dangerous gas leaking into the first cabin 110 from being ignited by the non-explosion-proof electrical equipment, thereby further improving the safety of the ship. The second set duration is greater than the first set duration.

[0056] The present invention also provides a hazardous gas isolation protection method, which is used to be implemented in the above-mentioned hazardous gas isolation device for ships. By controlling the above-mentioned hazardous gas isolation device for ships through the hazardous gas isolation protection method, the safety of ship use can be effectively improved. The hazardous gas isolation protection method includes:

[0057] S100, after the door leaf structure 2 is locked to the door frame structure 1, the pressure difference between the annular closed air cavity 3 and the second cabin 120 is obtained.

[0058] S200, determining whether the pressure difference between the annular closed air cavity 3 and the second cabin 120 is within a set pressure difference range.

[0059] The set pressure difference range is an empirical range value obtained from a large number of previous tests. In this embodiment, the set pressure difference range is 25Pa to 150Pa.

[0060] If the pressure difference between the annular closed air cavity 3 and the second cabin 120 is less than the minimum value of the set pressure difference range, step S300 is executed.

[0061] S300, control the inflation assembly 5 to inflate the annular closed air cavity 3 until the pressure difference between the annular closed air cavity 3 and the second cabin 120 is greater than the maximum value of the set pressure difference range, and then control the inflation assembly 5 to stop inflating. It can be understood that when the pressure difference between the annular closed air cavity 3 and the second cabin 120 is greater than the maximum value of the set pressure difference range, it indicates that the air pressure in the annular closed air cavity 3 is large enough, and the dangerous gas in the second cabin 120 cannot enter the first cabin 110, thereby improving the safety of the ship.

[0062] In order to further improve the safety of ship operation, the hazardous gas isolation protection method further includes the following steps after step S300:

[0063] S400, obtaining the pressure difference between the annular closed air cavity 3 and the second cabin 120 in real time.

[0064] S500, determining whether the pressure difference between the annular closed air cavity 3 and the second cabin 120 is less than the minimum value of the set pressure difference range.

[0065] If the pressure difference between the annular closed air cavity 3 and the second cabin 120 is less than the minimum value of the set pressure difference range, the timing starts and is counted as the timing duration. It can be understood that if the pressure difference between the annular closed air cavity 3 and the second cabin 120 is less than the minimum value of the set pressure difference range, it indicates that there is a risk of dangerous gas leaking from the second cabin 120 to the first cabin 110, so the timing starts at this time.

[0066] If the pressure difference between the annular closed air cavity 3 and the second cabin 120 is greater than or equal to the minimum value of the set pressure difference range, it indicates that the pressure difference between the annular closed air cavity 3 and the second cabin 120 is within the normal range, and the process returns to step S400.

[0067] S600: Determine whether the timing duration is greater than or equal to a first set duration.

[0068] If the timing duration is greater than or equal to the first set duration, step S700 is executed.

[0069] S700, control to sound an alarm. That is, the controller controls the alarm to sound an alarm to remind the crew on the ship to pay attention to the leakage of dangerous gas.

[0070] S800: Determine whether the timing duration is greater than or equal to a second set duration.

[0071] If the timing duration is greater than or equal to the second set duration, step S900 is executed.

[0072] S900, control to cut off the power supply of the non-explosion-proof electrical equipment in the first cabin 110. This prevents the dangerous gas leaking into the first cabin 110 from being ignited by the non-explosion-proof electrical equipment, thereby further improving the safety of the ship. The first set time length is less than the second set time length.

[0073] The first set time length and the second set time length are both empirical values ​​obtained from a large number of previous experiments. In this embodiment, the first set time length is 2 minutes and the second set time length is 5 minutes.

[0074] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A hazardous gas isolation device for a ship, the ship comprising a first cabin (110), a second cabin (120) and a deck (130), the deck (130) separating the first cabin (110) from the second cabin (120), and the deck (130) being provided with an opening (131) connecting the first cabin (110) and the second cabin (120), characterized in that: The hazardous gas isolation device for ships comprises: A safety door assembly distributed in the first cabin (110), the safety door assembly comprising a door frame structure (1) located at the opening (131) and fixedly connected to the deck (130), and a door leaf structure (2) hinged to the door frame structure (1), the door leaf structure (2) being capable of being locked to the door frame structure (1) and closing the opening (131), and when the door leaf structure (2) is locked to the door frame structure (1), the door frame structure (1) and the door leaf structure (2) form an annular closed air cavity (3), the annular closed air cavity (3) surrounds the periphery of the opening (131) and is spaced apart from the opening (131); an isolation protection component, the isolation protection component comprising a pressure difference sensor (4) and an inflation component (5), the pressure difference sensor (4) being used to monitor the pressure difference between the annular closed air cavity (3) and the second cabin (120), and the inflation component (5) being used to inflate air into the annular closed air cavity (3); There is dangerous gas in the second cabin (120).

2. The hazardous gas isolation device for ships according to claim 1, characterized in that: The inflation assembly (5) comprises a compressed gas cylinder (51) and a first control valve (52), and the gas outlet of the compressed gas cylinder (51), the first control valve (52) and the annular closed gas cavity (3) are sequentially connected.

3. The hazardous gas isolation device for ships according to claim 2, characterized in that: The inflation assembly (5) further comprises a second control valve (53) and an air source, wherein the air source, the second control valve (53) and the air supply port of the compressed gas cylinder (51) are connected in sequence.

4. The hazardous gas isolation device for ships according to claim 1, characterized in that: The inflation component (5) comprises a fan (54), and an air outlet of the fan (54) is connected to the annular closed air cavity (3) through an inflation pipe (55).

5. The hazardous gas isolation device for ships according to any one of claims 1 to 4, characterized in that: The door frame structure (1) comprises a door frame bottom plate (11) located at the opening (131) and fixedly connected to the deck (130), and a door frame enclosure plate (12) fixedly connected to the periphery of the door frame bottom plate (11); the door leaf structure (2) comprises a door leaf outer plate (21) and a door leaf inner plate (22) connected to each other; when the door leaf structure (2) is locked to the door frame structure (1), the door frame bottom plate (11), the door frame enclosure plate (12), the door leaf outer plate (21) and the door leaf inner plate (22) form the annular closed air cavity (3).

6. The hazardous gas isolation device for ships according to claim 5, characterized in that: One of the door frame bottom plate (11) and the door leaf inner plate (22) is provided with a first sealing ring (13); when the door leaf structure (2) is locked to the door frame structure (1), the first sealing ring (13) is used to seal the gap between the door frame bottom plate (11) and the door leaf inner plate (22).

7. The hazardous gas isolation device for ships according to claim 5, characterized in that: One of the door frame panel (12) and the door leaf outer panel (21) is provided with a second sealing ring (14). When the door leaf structure (2) is locked to the door frame structure (1), the second sealing ring (14) is used to seal the gap between the door frame panel (12) and the door leaf outer panel (21).

8. A method for isolating and protecting hazardous gases, characterized in that: The hazardous gas isolation device for ships according to any one of claims 1 to 7 is used, and the hazardous gas isolation protection method comprises: When the door leaf structure (2) is locked to the door frame structure (1), the pressure difference between the annular closed air cavity (3) and the second cabin (120) is obtained; Determining whether the pressure difference between the annular closed air cavity (3) and the second cabin (120) is within a set pressure difference range; If the pressure difference between the annular closed air cavity (3) and the second cabin (120) is less than the minimum value of the set pressure difference range, the inflation component (5) is controlled to inflate air into the annular closed air cavity (3) until the pressure difference between the annular closed air cavity (3) and the second cabin (120) is greater than the maximum value of the set pressure difference range, and then the inflation component (5) is controlled to stop inflating.

9. The hazardous gas isolation protection method according to claim 8, characterized in that: After controlling the inflation component (5) to stop inflation, the following steps are also included: acquiring the pressure difference between the annular closed air cavity (3) and the second cabin (120) in real time; Determining whether the pressure difference between the annular closed air cavity (3) and the second cabin (120) is less than the minimum value of the set pressure difference range; If the pressure difference between the annular closed air cavity (3) and the second cabin (120) is less than the minimum value of the set pressure difference range, then start timing and count it as the timing duration; Determine whether the timing duration is greater than or equal to a first set duration; If the timing duration is greater than or equal to the first set duration, the control generates an alarm.

10. The hazardous gas isolation protection method according to claim 9, characterized in that: After the control issues an alarm, the following steps are also included: Determine whether the timing duration is greater than or equal to a second set duration; If the timing duration is greater than or equal to the second set duration, controlling to cut off the power supply of the non-explosion-proof electrical equipment in the first cabin (110); The first set duration is shorter than the second set duration.

Images