Anti-overflow ventilation device for daily fuel tank of ship

Abstract

The utility model discloses an anti-overflow ventilation device for a daily fuel tank of a ship. The anti-overflow ventilation device is arranged on a straight pipe section of a gooseneck-shaped ventilation pipe, and a rib floater is arranged at the bottom end of the gooseneck-shaped ventilation pipe; the anti-overflow ventilation device comprises an anti-overflow cavity, the side wall of the cavity is connected with an oil return pipeline, openings consistent with the gooseneck type ventilation pipe in pipe diameter are formed in the upper bottom and the lower bottom, a limiting device A is installed in each opening, a limiting device B is further arranged over a second opening, a plug is further arranged in the cavity, and the plug is a ball core of a hollow sphere structure. The diameter of the ball core is larger than the diameter of the limiting device or the pipe diameter of the gooseneck-shaped ventilation pipe, a connecting rod is fixedly connected to any point of the ball core, the other end of the connecting rod extends into the daily fuel oil tank and is connected with a cylindrical floating assisting object, and through the device, blocking is achieved to prevent overflow when the liquid level of fuel oil rises, and ventilation is achieved through the limiting assembly B when the liquid level descends. The floating aid drives the plug to move to prevent overflow, so that the use safety of the fuel tank is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of marine equipment technology, specifically to a venting device for preventing overflow of marine daily fuel tanks. Background Technology

[0002] In the design of ship piping systems, in accordance with the relevant specifications of classification societies, all liquid tanks should be equipped with air vents or overflow lines to prevent overpressure during injection. Existing shipboard day fuel tanks use vent pipes that extend directly from the deck surface, employing gooseneck vents to achieve both weather tightness and ventilation. Figure 1 As shown, the return oil pipe diameter of the ship's day fuel tank is smaller than that of the supply oil pipe, and the fuel level in the fuel tank may be higher than that of the day fuel tank. Therefore, under normal operating conditions, the return oil pipe is in a closed state, making it difficult for the return oil pipe to function properly. During fuel refueling, fuel in the ship's day fuel tank may overflow through the vent pipe due to equipment failure or improper operation, causing not only environmental problems but also increasing the danger to the ship's equipment and personnel. Summary of the Invention

[0003] An overflow prevention and ventilation device for a ship's daily fuel tank, the device includes a gooseneck-shaped ventilation pipe installed on the daily fuel tank, an overflow prevention and ventilation device installed on a straight section of the gooseneck-shaped ventilation pipe, and a buoyancy aid installed at the bottom of the gooseneck-shaped ventilation pipe.

[0004] The overflow prevention and ventilation device includes an overflow prevention box. The side wall of the overflow prevention box cavity is provided with a return oil pipeline connected to the fuel tank. The top and bottom of the cavity are respectively provided with a first opening and a second opening with the same diameter as the gooseneck ventilation pipe. The first opening and the second opening are arranged on the same straight line as the straight section of the gooseneck ventilation pipe. The overflow prevention box cavity is provided with a sealing structure that can both prevent overflow and allow ventilation. The sealing structure includes a limiting device and a plug. The plug is connected to the buoyancy aid set in the fuel tank through a connecting rod.

[0005] The limiting device includes a limiting device A installed at the first and second openings of the overflow box, and a limiting device B installed inside the overflow box cavity to prevent the plug from completely sealing the fuel tank.

[0006] Furthermore, the limiting device A is a cylindrical component with a channel in the middle fixed by a support page, allowing the connecting rod to pass through. The channel is a cylindrical channel with a diameter larger than that of the connecting rod.

[0007] Furthermore, the limiting device B is an annular protrusion located inside the overflow prevention cavity at the bottom, including a support foot and an annular bottom, wherein the support foot is located on the annular bottom for supporting the plug.

[0008] Furthermore, the limiting device B has at least three legs.

[0009] Furthermore, the overflow box has a cylindrical cavity structure, and the top surface of the cavity is detachably connected to the overflow box.

[0010] Furthermore, the plug is a hollow spherical core with an outer diameter larger than the inner diameter of the straight section of the gooseneck ventilation pipe.

[0011] Furthermore, the connecting rod includes an upper section and a lower section mounted on the ball core, and the installation of the upper and lower sections is in a straight line with the central axis of the ball core.

[0012] Furthermore, the upper section is longer than the cavity height of the overflow box, and is used to pass through the channel of the limiting device A set at the first opening to prevent the ball core from tilting.

[0013] Furthermore, the lower section is connected to the buoyancy aid, and the length of the lower section is less than or equal to the straight section length of the gooseneck-shaped ventilation pipe at the lower end of the overflow box.

[0014] Furthermore, the buoyancy aid has a cylindrical structure, and its outer diameter is smaller than the inner diameter of the straight pipe section.

[0015] The working principle of this utility model is as follows: An overflow prevention and ventilation device for a ship's daily fuel tank (1) includes a gooseneck-type ventilation pipe (2) installed on the daily fuel tank (1), an overflow prevention and ventilation device installed on the straight pipe section (22) of the gooseneck-type ventilation pipe (2), and a buoyancy aid (8) installed at the bottom of the gooseneck-type ventilation pipe (2). When the device is installed on the daily fuel tank (1), under normal conditions, the ball core (5) is located in the center of the overflow prevention cavity or on the support of the limiting component B. There is a gap between the ball core (5) and the straight pipe section (22) of the gooseneck-type ventilation pipe (2) of the fuel tank, which does not affect the ventilation between the daily fuel tank (1) and the outside world.

[0016] When the fuel level in the ship's daily fuel tank (1) rises and approaches the buoyancy aid (8) of the device, the buoyancy aid (8) drives the connecting rod (9) and the ball core (5) to move vertically upward due to buoyancy. The ball core (5) eventually blocks the lower end of the gooseneck ventilation pipe (2), thereby achieving the purpose of preventing fuel overflow.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] (1) When the fuel level of the ship's daily fuel tank approaches the device, the ball core will block the vent pipe to prevent fuel overflow. Then the fuel can flow back to the fuel tank through the return oil pipeline. However, under normal conditions, the device maintains the gap through the limiting device, which does not affect the ventilation between the daily fuel tank and the outside world. This solves the problem of fuel overflow in the vent pipe of the ship's daily fuel tank caused by equipment failure or improper operation.

[0019] (2) The device prevents fuel from overflowing from the daily fuel tank without affecting the operation of the ship's vent pipe.

[0020] (3) The device is easy to add and install. It can be added and installed on the original vent pipe of the ship, and has good practicality and convenience. Attached Figure Description

[0021] Figure 1 A schematic diagram of the existing daily fuel tank pipeline of a certain ship;

[0022] Figure 2 This is a schematic diagram of the external structure of this utility model;

[0023] Figure 3 This is a cross-sectional view of the sphere core of this utility model in the floating state;

[0024] Figure 4 This is a cross-sectional view of the sphere core of this utility model in the sunken state;

[0025] Figure 5 This is a schematic diagram of the structure of the limiting device A of this utility model;

[0026] Figure 6 This is a schematic diagram of the structure of the limiting device B of this utility model;

[0027] Figure 7 This is a schematic diagram illustrating the overflow prevention mechanism of this utility model;

[0028] Figure 8 This is a schematic diagram of the air permeability state of this utility model;

[0029] Figure 9 This is a schematic diagram of the usage state of this utility model;

[0030] In the diagram, 1-Daily fuel tank; 2-Gooseneck ventilation pipe; 21-Bend section; 22-Straight section; 3-Overflow prevention box; 31-First opening; 32-Second opening; 33-Flange; 4-Return oil pipeline; 5-Ball core; 6-Limiting device A; 61-Support leaf; 62-Channel; 7-Limiting device B; 71-Bottom ring; 72-Feet; 8-Floater; 9-Connecting rod; 91-Upper section; 92-Lower section. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0032] One embodiment of this utility model: an overflow prevention and ventilation device for a ship's daily fuel tank 1. The device is located above the top deck of the daily fuel tank 1 and includes a gooseneck ventilation pipe 2, an overflow prevention box 3, a limiting device A 6, a limiting device B 7, a connecting rod 9, a sealing ring (O-ring), a buoyancy aid 8, a ball core 5, a return oil pipeline 4, and a flange connecting the return oil pipeline 4. The sealing ring is made of rubber, and all other components are made of 316 stainless steel and machined by a lathe according to the usage dimensions. The connecting rod 9, the ball core 5, and the buoyancy aid 8 are all positive buoyancy hollow sealed cavities.

[0033] The gooseneck-shaped ventilation pipe 2 includes a straight pipe section 22 and a bent pipe section 21. The end of the straight pipe section 22 is connected to the daily fuel tank 1 to enable ventilation between the fuel tank and the outside.

[0034] The overflow prevention box 3 is a cylindrical cavity structure, installed on the straight section 22 of the gooseneck ventilation duct 2. The top and bottom surfaces of the overflow prevention box 3 have openings connecting to the straight section 22 of the gooseneck ventilation duct 2, namely a first opening 31 and a second opening 32. The first opening 31 is located on the top surface of the cavity and is detachably connected to the overflow prevention box 3. The second opening 32 is located on the bottom surface of the overflow prevention box 3. The first opening 31 and the second opening 32 are aligned with the straight section 22 of the gooseneck ventilation duct 2. A limiting device A is installed at the first opening 31, and the structure of the limiting device A is as follows: Figure 3 As shown, the limiting device A is a hollow cylinder. A central channel 62, which allows the connecting rod 9 to pass through, is fixedly installed in the middle of the cylinder through a cross-shaped support plate 61. The inner diameter of the central channel 62 is slightly larger than the outer diameter of the connecting rod 9, so that the connecting rod 9 is in a vertical state and can move up and down. The same limiting device A is installed at the second opening 32, and a limiting device B is also fixedly installed in the cavity above the limiting device A at the second opening 32. The limiting device B includes a support foot and a ring bottom. The ring bottom is fixed to the bottom of the overflow box 3 and the through hole of the ring bottom is aligned with the second opening 32 at the bottom of the overflow box 3. The support foot is set on the ring bottom to support the plug. The plug is a hollow spherical core 5. The outer diameter of the spherical core 5 is larger than the inner diameter of the straight section 22 of the gooseneck ventilation pipe 2. When the fuel level drops, the spherical core 5 falls to the support foot of the limiting device B under the action of gravity. The three support feet set on the ring bottom stably support the spherical core 5, and a gap is formed between the spherical core 5 and the second opening 32 to ensure the permeability of the daily fuel tank.

[0035] The surface of the ball core 5 is fitted with an upper section 91 and a lower section 92 of a connecting rod 9. The upper section 91 and the lower section 92 are installed on the extension line of the central axis of the ball core 2, and the length of the upper section 91 is greater than the cavity height of the overflow box 3, so as to pass through the channel of the limiting device A 6 set at the first opening 31 to prevent the ball core 5 from tilting. The lower section 92 is connected to the buoyancy aid 8, and the length of the lower section 92 is less than or equal to the length of the straight pipe section 22 of the gooseneck-shaped ventilation pipe 2 at the lower end of the overflow box 3.

[0036] The buoyancy aid 8 is a hollow cylindrical structure with an outer diameter slightly smaller than the inner diameter of the straight pipe ventilation hole. It is located at the lower end of the connecting rod 9, and the other end of the connecting rod 9 is connected to the ball core 5 set in the overflow box 3.

[0037] It should be understood that the specific embodiments described above are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within its protection scope. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. An overflow prevention and ventilation device for a marine daily fuel tank (1), the device comprising a gooseneck-type ventilation pipe (2) disposed on the daily fuel tank (1), characterized in that, It also includes an overflow prevention and ventilation device installed on the straight section (22) of the gooseneck ventilation pipe (2) and a buoyancy aid (8) installed at the bottom of the gooseneck ventilation pipe (2). The overflow prevention and ventilation device includes an overflow prevention box (3). The overflow prevention box (3) has a return oil pipeline (4) connected to the fuel tank on its side wall. The top and bottom of the cavity are respectively provided with a first opening (31) and a second opening (32) with the same diameter as the gooseneck ventilation pipe (2). The first opening (31) and the second opening (32) are set on the same straight line as the straight pipe section (22) of the gooseneck ventilation pipe (2). The overflow prevention box (3) is provided with a sealing structure that can both prevent overflow and allow ventilation. The sealing structure includes a limiting device and a plug. The plug is connected to the buoyancy aid set in the fuel tank through a connecting rod (9). The limiting device includes a limiting device A (6) provided at the first opening (31) and the second opening (32) of the overflow box (3) and a limiting device B (7) provided in the cavity of the overflow box (3) to prevent the plug from completely sealing the fuel tank.

2. The anti-overflow venting device for a marine daily fuel tank (1) according to claim 1, characterized in that, The limiting device A (6) is a cylindrical component with a channel (62) in the middle fixed by a support page (61) that allows the connecting rod (9) to pass through. The channel (62) is a columnar channel (62) with a diameter larger than that of the connecting rod (9).

3. The anti-overflow venting device for a marine daily fuel tank (1) according to claim 1, characterized in that, The limiting device B (7) is a circular protrusion located inside the overflow prevention cavity, including a support foot and a ring bottom. The support foot is located on the ring bottom to support the plug.

4. The anti-overflow venting device for a marine daily fuel tank (1) according to claim 3, characterized in that, The limiting device B (7) has at least three legs.

5. The anti-overflow venting device for a marine daily fuel tank (1) according to claim 1, characterized in that, The overflow box (3) is a cylindrical cavity structure, and the top surface of the cavity is detachably connected to the overflow box (3).

6. The anti-overflow venting device for a marine daily fuel tank (1) according to claim 1, characterized in that, The plug is a hollow spherical core (5), and the outer diameter of the core (5) is larger than the inner diameter of the straight section (22) of the gooseneck ventilation pipe (2).

7. The anti-overflow venting device for a marine daily fuel tank (1) according to claim 1, characterized in that, The connecting rod (9) includes an upper section (91) and a lower section (92) installed on the ball core (5), and the installation of the upper section (91) and the lower section (92) is in a straight line with the central axis of the ball core.

8. The anti-overflow venting device for a marine daily fuel tank (1) according to claim 7, characterized in that, The upper section (91) is longer than the cavity height of the overflow box (3) and is used to pass through the channel of the limiting device A (6) set at the first opening (31) to prevent the ball core (5) from tilting.

9. The anti-overflow venting device for a marine daily fuel tank (1) according to claim 7, characterized in that, The lower section (92) is connected to the buoyancy aid (8), and the length of the lower section (92) is less than or equal to the length of the straight section (22) of the gooseneck ventilation pipe (2) at the lower end of the overflow box (3).

10. The anti-overflow venting device for a marine daily fuel tank (1) according to claim 1, characterized in that, The buoyancy aid (8) is a cylindrical structure, and the outer diameter of the buoyancy aid (8) is smaller than the inner diameter of the straight pipe section (22).

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