A nitrogen sealing device for a storage tank

Abstract

The utility model discloses a kind of nitrogen seal devices of storage tank, it is related to the technical field of nitrogen seal of storage tank, including nitrogen seal structure, gas guide structure, adjusting structure and exhaust structure, nitrogen seal structure is installed on the storage tank body, gas guide structure, adjusting structure and exhaust structure are installed on nitrogen seal structure, nitrogen seal structure includes box, baffle and piston, box is installed on the storage tank body, baffle is fixedly installed in box, piston is slidably arranged in box, and piston and baffle are parallelly arranged.The nitrogen seal device of the storage tank can be adapted to the change of gas pressure in the storage tank by adjusting the storage volume of gas in the box, so as to maintain the constant gas pressure of the storage tank without wasting gas, greatly improving the practicability of the device, in addition, multiple nitrogen seal devices of the storage tank can be used in combination to facilitate the gas pressure change in the storage tank or maintain the gas pressure balance of multiple storage tanks storing the same material, further enhancing the practicability and applicability of the device.

Description

Technical Field

[0001] This utility model relates to the field of nitrogen sealing technology for storage tanks, and more specifically, to a nitrogen sealing device for storage tanks. Background Technology

[0002] In chemical and oil refining industries, there are numerous storage tanks, such as raw material tanks for storing hazardous chemicals, intermediate tanks containing hazardous chemicals, aromatic hydrocarbon tanks, and light oily waste tanks. Many materials naturally volatilize or react with oxygen in the air to form various compounds. Some of these volatile substances are toxic or have unpleasant odors, posing serious harm and pollution to the atmospheric environment. In particular, the reaction between hazardous chemicals and air can produce other compounds, and may even lead to deflagration or explosion, creating safety hazards. To address these issues, the most widely used technology is inert gas protection. This involves replacing the air inside the storage tank with an inert gas (such as nitrogen) and sealing the tank to prevent the stored materials from coming into contact with oxygen in the air and forming an explosive mixture, thus avoiding the risk of combustion and explosion. It also prevents the emission of VOCs from polluting the atmosphere.

[0003] Chinese utility model patent CN220282363U discloses a nitrogen sealing device for a storage tank, including a nitrogen sealing tank. A nitrogen venting pipe is fixed to the upper end of the nitrogen sealing tank, and a nitrogen replenishment mechanism is provided at the end of the nitrogen venting pipe. The nitrogen replenishment mechanism includes a nitrogen storage box, a first shut-off valve, a connecting pipe, and a nitrogen indicator bladder. The nitrogen storage box is fixed to the outer surface of the nitrogen sealing tank. The above technical solution, through the nitrogen replenishment mechanism, allows the nitrogen stored in the nitrogen storage box to be introduced into the nitrogen sealing tank to replenish the gas pressure. This can prevent the nitrogen sealing tank from drawing in air due to negative pressure and oxidizing the oil. During the process of filling the nitrogen sealing tank with oil, the oil directly presses some nitrogen into the nitrogen storage box for later use. This can improve the situation of nitrogen being squeezed out and wasted during the traditional oil filling process. However, although the above technical solution can store some nitrogen using a nitrogen storage box, the nitrogen storage box and the storage tank are connected when the first shut-off valve is open. Therefore, even without adding or removing nitrogen, the oil added to or removed from the storage tank will still cause changes in the gas pressure inside the storage tank, making it difficult to maintain a constant gas pressure in the storage tank and resulting in poor practicality. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a nitrogen sealing device for storage tanks, which adapts to changes in gas pressure inside the storage tank by adjusting the gas volume inside the box, thereby maintaining gas pressure balance while avoiding waste caused by gas discharge, and effectively improving the practicality and applicability of the device.

[0005] To achieve the above objectives, this utility model provides a nitrogen sealing device for a storage tank, which is installed on the storage tank body and includes a nitrogen sealing structure installed on the storage tank body, as well as a gas guiding structure, a regulating structure and an exhaust structure installed on the nitrogen sealing structure. The nitrogen sealing structure includes a box body installed on the tank body, a partition plate fixedly installed inside the box body, and a piston slidably disposed inside the box body. The adjustment structure is used to drive the piston to move. The gas guiding structure includes a first gas guiding pipe and a second gas guiding pipe installed on one side of the box body along its length, a gas collecting channel installed horizontally inside the box body, a flow meter installed on the gas collecting channel, and a female connector end installed on the first gas guiding pipe and the second gas guiding pipe at the end away from the box body; one of the first gas guiding pipe and the second gas guiding pipe is connected to the storage tank body, and a nitrogen supply device is installed on the other of the first gas guiding pipe and the second gas guiding pipe. One end of the gas collection channel is fixed to the inner wall of the box body near the first gas guide pipe and the second gas guide pipe, and the gas collection channel covers the first gas guide pipe and the second gas guide pipe. The other end of the gas collection channel passes through the partition. The exhaust structure includes an exhaust pipe mounted on the housing, a second electronically controlled valve mounted on the exhaust pipe, and a male connector end mounted on the side of the exhaust pipe away from the piston. One end of the exhaust pipe with the male connector end extends to the outside of the housing, and the other end of the exhaust pipe away from the male connector end passes through the partition.

[0006] Furthermore, the adjustment structure includes a threaded rod fixedly installed on the side of the piston away from the partition, a threaded sleeve threaded on the outside of the threaded rod and rotatably connected to the housing, and a rotating assembly installed inside the housing for driving the threaded sleeve to rotate.

[0007] Furthermore, the rotating assembly includes a fixed gear ring mounted on the outside of the threaded sleeve, a drive component mounted on the inner wall of the housing, and a gear fixedly mounted on the output end of the drive component and meshing with the fixed gear ring.

[0008] Furthermore, the threaded sleeve is T-shaped, the fixed toothed ring is installed on the long axis section of the threaded sleeve, the inner wall of the box is equipped with a limiting ring corresponding to the position of the short axis section of the threaded sleeve, and a limiting groove is opened on the outer periphery of the short axis section of the threaded sleeve to slide and adapt to the limiting ring.

[0009] Furthermore, a ball valve or a shut-off valve is provided inside the female end of the connector.

[0010] Furthermore, a sensing component is installed on the inner wall of the box. The sensing component includes two air supply sensors installed on the top wall of the box and near the partition, and two exhaust sensors installed on the top wall of the box and near the adjustment structure. The two air supply sensors and the two exhaust sensors are arranged linearly and evenly on the top wall of the box.

[0011] Furthermore, three indicator lights are installed on the outside of the box, which respectively represent air replenishment reminder, normal use, and exhaust reminder.

[0012] Furthermore, a controller is installed inside the housing, and the flow meter, the drive unit, the second electrically controlled valve, the air supply sensor, the exhaust sensor, and the indicator light are all electrically connected to the controller.

[0013] Furthermore, a breather valve is installed on the tank body, and a male connector end adapted to the female connector end is installed on the end of the breather valve opposite to the tank body.

[0014] Compared with the prior art, this utility model has the following advantages and effects: 1. The nitrogen sealing device for storage tanks in this utility model can detect the gas flow rate entering or leaving the box through the flow meter, and the adjustment structure can adjust the moving direction and speed of the piston according to the gas flow rate entering or leaving the box. Thus, while avoiding waste caused by gas discharge, the gas storage volume in the box is increased or decreased to maintain a constant gas pressure in the storage tank. In addition, multiple nitrogen sealing devices for storage tanks can be used in combination to meet the large-scale gas pressure changes in the storage tank or maintain the gas pressure balance of multiple storage tanks storing the same material, effectively enhancing the practicality and applicability of the device.

[0015] 2. The nitrogen sealing device for storage tanks in this utility model, through the cooperation of controller, sensing components and indicator lights, can detect the inflation and deflation processes, so as to promptly issue warning signals when inflation or deflation failures occur, effectively improving the practicality and safety of the device. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the nitrogen sealing device for the storage tank in an embodiment of this utility model; Figure 2 This is a cross-sectional structural diagram of the nitrogen sealing device for the storage tank in an embodiment of this utility model; Figure 3 These are schematic diagrams illustrating the use of Embodiments 2 and 3 of this utility model.

[0017] Explanation of reference numerals in the attached figures: 1-Nitrogen-sealed structure; 11-Box body; 111-Limiting ring; 12-Baffle plate; 13-Piston; 2-Gas guiding structure; 21-First gas guiding pipe; 22-Second gas guiding pipe; 23-Gas collecting channel; 24-Flow meter; 25-Mother connector end; 3-Adjusting structure; 31-Threaded rod; 32-Threaded sleeve; 33-Fixed gear ring; 34-Drive component; 35-Gear; 4-Exhaust structure; 41-Exhaust pipe; 42-Second electronic control valve; 43-Male connector end; 5-Controller; 6-Sensing component; 61-Injection sensor; 62-Exhaust sensor; 7-Indicator lights; 8-Tank body; 81-Breathing valve; 9-Nitrogen supply equipment. Detailed Implementation

[0018] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] Please see Figure 1-3 As shown, this utility model embodiment provides a nitrogen sealing device for a storage tank, which is installed on the storage tank body 8. It includes a nitrogen sealing structure 1, a gas guiding structure 2, an adjusting structure 3, and an exhaust structure 4. The nitrogen sealing structure 1 is installed on the storage tank body 8, and the gas guiding structure 2, the adjusting structure 3, and the exhaust structure 4 are installed on the nitrogen sealing structure 1.

[0021] The nitrogen sealing structure 1 includes a box 11, a partition 12, and a piston 13. The box 11 is installed on the storage tank body 8, the partition 12 is fixedly installed inside the box 11, and the piston 13 is slidably arranged inside the box 11. The piston 13 and the partition 12 are arranged in parallel. The adjustment structure 3 is used to drive the piston 13 to move.

[0022] The gas guiding structure 2 includes a first gas guiding pipe 21, a second gas guiding pipe 22, a gas collecting channel 23, a flow meter 24, and a female connector end 25. The first gas guiding pipe 21 and the second gas guiding pipe 22 are installed on one side of the box body 11 along its length. The gas collecting channel 23 is installed horizontally inside the box body 11. The flow meter 24 is installed on the gas collecting channel 23 and is used to detect the gas flow rate through the gas collecting channel 23. The female connector end 25 is installed at the end of the first gas guiding pipe 21 and the second gas guiding pipe 22 away from the box body 11. One of the first gas guiding pipe 21 and the second gas guiding pipe 22 is connected to the storage tank body 8, and a nitrogen supply device 9 is installed on the other of the first gas guiding pipe 21 and the second gas guiding pipe 22.

[0023] One end of the gas collection channel 23 is fixed to the inner wall of the box 11 near the first air guide pipe 21 and the second air guide pipe 22, and the gas collection channel 23 covers the first air guide pipe 21 and the second air guide pipe 22. The other end of the gas collection channel 23 passes through the partition 12.

[0024] As a further description of the above scheme, the flow meter 24 can detect the flow rate of gas entering the box 11, and the adjustment structure 3 can adjust the moving speed of the piston 13 according to the flow rate of gas entering or exiting the box 11, thereby maintaining a constant gas pressure in the storage tank by increasing or decreasing the gas storage volume in the box 11 while avoiding waste caused by gas discharge.

[0025] The exhaust structure 4 includes an exhaust pipe 41, a second electronically controlled valve 42, and a male connector end 43. The exhaust pipe 41 is mounted on the housing 11, the second electronically controlled valve 42 is mounted on the exhaust pipe 41, and the male connector end 43 is mounted on the side of the exhaust pipe 41 away from the piston 13. The end of the exhaust pipe 41 with the male connector end 43 extends to the outside of the housing 11, and the end of the exhaust pipe 41 away from the male connector end 43 passes through the partition 12.

[0026] As a further description of the above scheme, when the gas pressure of the storage tank varies greatly or there are multiple storage tanks storing the same material, the nitrogen sealing structure 1 can be connected to the first gas guide pipe 21 or the second gas guide pipe 22 on other nitrogen sealing structures 1 through the male end 43 of the connector, thereby realizing the series connection of multiple nitrogen sealing structures 1, and then adapting to a wider range of gas pressure fluctuation amplitude through the combined use of nitrogen sealing structures 1.

[0027] As a preferred embodiment of the above scheme, when using only one nitrogen sealing structure 1 and one storage tank, one of the first gas guide pipe 21 and the second gas guide pipe 22 on the nitrogen sealing structure 1 is connected to the storage tank body 8, and the other of the first gas guide pipe 21 and the second gas guide pipe 22 is connected to the nitrogen supply equipment 9; when there are multiple nitrogen sealing structures 1 and one storage tank, the multiple nitrogen sealing structures 1 are connected in series by connecting the first gas guide pipe 21 or the second gas guide pipe 22 to the male end 43 of the connector on other nitrogen sealing structures 1, and finally the remaining first gas guide pipe 21 or the second gas guide pipe 22 is connected to the nitrogen supply equipment 9; when there are multiple nitrogen sealing structures 1 and an equal number of storage tanks as nitrogen sealing structures 1, the multiple nitrogen sealing structures 1 need to be connected in series first, and then the remaining first gas guide pipe 21 or the second gas guide pipe 22 on each nitrogen sealing structure 1 is used to connect each storage tank, and finally the remaining first gas guide pipe 21 or the second gas guide pipe 22 is connected to the nitrogen supply equipment 9.

[0028] Please see Figure 1-2 As shown, the adjustment structure 3 includes a threaded rod 31, a threaded sleeve 32, and a rotating assembly. The threaded rod 31 is fixedly installed on the side of the piston 13 away from the partition plate 12. The threaded sleeve 32 is threadedly installed on the outside of the threaded rod 31 and rotatably connected to the housing 11. The rotating assembly is installed inside the housing 11 and is used to drive the threaded sleeve 32 to rotate. This allows the threaded rod 31 to move along the axial direction by rotating the threaded sleeve 32.

[0029] Please see Figure 2 As shown, the rotating assembly includes a fixed gear ring 33, a driving member 34, and a gear 35. The fixed gear ring 33 is installed on the outside of the threaded sleeve 32, the driving member 34 is installed on the inner wall of the housing 11, and the gear 35 is fixedly installed on the output end of the driving member 34 and meshes with the fixed gear ring 33. This allows the driving member 34 to drive the threaded sleeve 32 to rotate using the transmission action of the fixed gear ring 33 and the gear 35.

[0030] Please see Figure 1-2 As shown, the threaded sleeve 32 is T-shaped, and the fixed toothed ring 33 is installed on the long axis section of the threaded sleeve 32. The inner wall of the housing 11 is equipped with a limiting ring 111 corresponding to the position of the short axis section of the threaded sleeve 32. The outer periphery of the short axis section of the threaded sleeve 32 is provided with a limiting groove that is adapted to slide with the limiting ring 111. The cooperation of the limiting ring 111 and the limiting groove can effectively restrict the movement of the threaded sleeve 32 along the axial direction without affecting the rotation of the threaded sleeve 32.

[0031] As a further description of the above solution, the box body 11 is provided with a through hole that is coaxial with the threaded sleeve 32 and has a size larger than the long axis of the threaded sleeve 32. A rotating inner liner is installed between the inner wall of the through hole and the outer wall of the threaded sleeve 32 to ensure the smooth rotation of the threaded sleeve 32.

[0032] Specifically, a ball valve or a stop valve is provided inside the female end 25 of the connector; by providing a ball valve or a stop valve, air flow can be blocked when the male end 43 of the connector is not connected to the female end 25 of the connector.

[0033] Please see Figure 2 As shown, a sensing component 6 is installed on the inner wall of the box 11. The sensing component 6 includes two air supply sensors 61 installed on the inner top wall of the box 11 and near the partition 12, and two exhaust sensors 62 installed on the inner top wall of the box 11 and near the adjustment structure 3. The two air supply sensors 61 and the two exhaust sensors 62 are arranged linearly and evenly on the inner top wall of the box 11.

[0034] Please see Figure 1 As shown, three indicator lights 7 are installed on the outside of the box 11. The three indicator lights 7 represent air replenishment reminder, normal use, and exhaust reminder, respectively.

[0035] Please see Figure 1-2 As shown, the controller 5 is installed inside the housing 11, and the flow meter 24, the drive unit 34, the second electric control valve 42, the air supply sensor 61, the exhaust sensor 62 and the indicator light 7 are all electrically connected to the controller 5.

[0036] As a further description of the above scheme, the sensing component 6 is used to detect the position of the piston 13. When the piston 13 moves to discharge the gas inside the box 11, the piston 13 moves towards the partition 12. During this process, the gas replenishment sensor 61 can be used to help determine the position of the piston 13. When the piston 13 moves to the first gas replenishment sensor 61, it means that the nitrogen is being consumed in large quantities. When the piston 13 moves to the second gas replenishment sensor 61, it means that the nitrogen is about to be consumed. At this time, the controller 5 can combine the sensing data of the gas replenishment sensor 61 to control the nitrogen supply equipment 9 to run the nitrogen replenishment operation, and replenish nitrogen into the box 11 while maintaining a constant gas pressure inside the storage tank body 8. When the gas in the storage tank body 8 flows to the box 11, the piston 13 moves towards the threaded sleeve 32 under the action of the adjustment structure 3. During this process, the exhaust sensor 62 can be used to help determine the position of the piston 13. When the piston 13 moves to the position of the first exhaust sensor 62, it means that nitrogen is filling the box 11 in large quantities. When the piston 13 moves to the position of the second exhaust sensor 62, it means that the box 11 is about to be filled with nitrogen. At this time, the controller 5 can control the opening and closing of the second electric control valve 42 in combination with the sensing data of the exhaust sensor 62, so that the excess nitrogen can be discharged by the exhaust structure 4 after the box 11 is filled. Furthermore, when the piston 13 moves to the position of the air replenishment sensor 61 adjacent to the partition 12, the controller 5 can cause the indicator light 7 representing the air replenishment reminder to illuminate until the nitrogen supply device 9 supplies nitrogen to the box 11, causing the piston 13 to move away from the position of the air replenishment sensor 61 adjacent to the partition 12. If the indicator light 7 representing the air replenishment reminder continues to illuminate, it indicates that the air replenishment process of the box 11 is abnormal and requires personnel intervention. Similarly, when the piston 13 moves to the position of the exhaust sensor 62 adjacent to the threaded sleeve 32, the controller 5 can cause the indicator light 7 representing the exhaust reminder to illuminate until the piston 13 moves away from the position of the exhaust sensor 62. If the indicator light 7 representing the exhaust reminder continues to illuminate, it indicates that the exhaust process of the box 11 is abnormal and requires personnel intervention.

[0037] As a preferred embodiment of the above solution, in addition to setting an indicator light 7 to warn of abnormal exhaust or replenishment, this application may also add a signal reflector to the controller 5 so as to send a warning signal to the mobile device on the worker's body when an abnormal situation occurs.

[0038] Please see Figure 3 As shown, a breather valve 81 is installed on the tank body 8. A male connector 43, which is adapted to the female connector 25, is installed on the end of the breather valve 81 away from the tank body 8. The breather valve 81 can open when the internal pressure of the tank body 8 rises and exceeds the set value to release excess gas (exhalation), thereby reducing the pressure and preventing the container from expanding, rupturing or exploding due to overpressure. It can also open when the internal pressure of the tank body 8 drops (generating a vacuum) and exceeds the set value to draw in external gas (inhalation), thereby eliminating the vacuum and preventing the container from being squeezed and deformed due to negative pressure.

[0039] The working process of the nitrogen sealing device for the aforementioned storage tank is as follows: In Example 1, a single storage tank body 8 corresponds to a single storage tank nitrogen sealing device. When in use, one of the first gas guide pipe 21 and the second gas guide pipe 22 needs to be connected to the breather valve 81 on the storage tank body 8. Then, the other of the first gas guide pipe 21 and the second gas guide pipe 22 is connected to the nitrogen supply device 9. When the internal pressure of the storage tank body 8 increases or decreases, the space in the box 11 used for storing nitrogen will change accordingly under the action of the adjustment structure 3, thereby maintaining the pressure balance inside the storage tank body 8 while avoiding nitrogen discharge and waste.

[0040] In Example 2, a single storage tank body 8 corresponds to multiple storage tank nitrogen sealing devices. If the expected range of gas pressure variation in the storage tank body 8 exceeds the adjustment range of a single storage tank nitrogen sealing device, the number of storage tank nitrogen sealing devices can be increased based on Example 1. If the number of added storage tank nitrogen sealing devices is greater than or equal to two, the adjustment structure 3 and the exhaust structure 4 need to be used in conjunction to realize the series connection of multiple storage tank nitrogen sealing devices. After the added storage tank nitrogen sealing devices are connected in series, when in use, the spare first gas guide pipe 21 or second gas guide pipe 22 is connected to the exhaust structure 4 on the storage tank nitrogen sealing device in Example 1, so that multiple storage tank nitrogen sealing devices are connected in series to form a whole, so as to adapt to the large range of gas pressure variation in the storage tank body 8 and increase the applicability of the device.

[0041] In Example 3, multiple storage tank bodies 8 correspond to multiple storage tank nitrogen sealing devices. If the materials stored in the multiple storage tank bodies 8 are the same, then based on Example 2, each storage tank nitrogen sealing device can be connected to a storage tank body 8 using the remaining first gas guide pipe 21 or second gas guide pipe 22, thereby maintaining the gas pressure balance of multiple storage tank bodies 8 at the same time.

[0042] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the protection scope of this invention.

Claims

1. A nitrogen sealing device for a storage tank, installed on the tank body (8), characterized in that, It includes a nitrogen sealing structure (1) installed on the tank body (8) and a gas guiding structure (2), a regulating structure (3) and an exhaust structure (4) installed on the nitrogen sealing structure (1). The nitrogen sealing structure (1) includes a box (11) installed on the tank body (8), a partition (12) fixedly installed inside the box (11), and a piston (13) slidably disposed inside the box (11). The adjustment structure (3) is used to drive the piston (13) to move. The gas guiding structure (2) includes a first gas guiding pipe (21) and a second gas guiding pipe (22) installed on one side of the box body (11) along its length, a gas collecting channel (23) installed horizontally inside the box body (11), a flow meter (24) installed on the gas collecting channel (23), and a female connector (25) installed at the end of the first gas guiding pipe (21) and the second gas guiding pipe (22) away from the box body (11); one of the first gas guiding pipe (21) and the second gas guiding pipe (22) is connected to the storage tank body (8), and a nitrogen supply device (9) is installed on the other of the first gas guiding pipe (21) and the second gas guiding pipe (22); One end of the gas collection channel (23) is fixed on the inner wall of the box body (11) near the first gas guide pipe (21) and the second gas guide pipe (22), and the gas collection channel (23) covers the first gas guide pipe (21) and the second gas guide pipe (22), and the other end of the gas collection channel (23) passes through the partition (12). The exhaust structure (4) includes an exhaust pipe (41) mounted on the housing (11), a second electronically controlled valve (42) mounted on the exhaust pipe (41), and a male connector end (43) mounted on the side of the exhaust pipe (41) away from the piston (13). One end of the exhaust pipe (41) with the male connector end (43) extends to the outside of the housing (11), and the other end of the exhaust pipe (41) away from the male connector end (43) passes through the partition (12).

2. The nitrogen sealing device for storage tanks according to claim 1, characterized in that, The adjustment structure (3) includes a threaded rod (31) fixedly installed on the side of the piston (13) away from the partition (12), a threaded sleeve (32) threaded on the outside of the threaded rod (31) and rotatably connected to the box body (11), and a rotating assembly installed inside the box body (11) for driving the threaded sleeve (32) to rotate.

3. The nitrogen sealing device for storage tanks according to claim 2, characterized in that, The rotating assembly includes a fixed gear ring (33) mounted on the outside of the threaded sleeve (32), a drive member (34) mounted on the inner wall of the housing (11), and a gear (35) fixedly mounted on the output end of the drive member (34) and meshing with the fixed gear ring (33).

4. The nitrogen sealing device for storage tanks according to claim 3, characterized in that, The threaded sleeve (32) is T-shaped, and the fixed toothed ring (33) is installed on the long axis section of the threaded sleeve (32). The inner wall of the box (11) is equipped with a limiting ring (111) corresponding to the position of the short axis section of the threaded sleeve (32). The outer periphery of the short axis section of the threaded sleeve (32) is provided with a limiting groove that is slidably adapted to the limiting ring (111).

5. The nitrogen sealing device for storage tanks according to claim 1, characterized in that, A ball valve or a shut-off valve is provided inside the female end (25) of the connector.

6. The nitrogen sealing device for storage tanks according to claim 3, characterized in that, The inner wall of the box (11) is equipped with a sensing component (6). The sensing component (6) includes two air supply sensors (61) installed on the inner top wall of the box (11) and near the partition (12), and two exhaust sensors (62) installed on the inner top wall of the box (11) and near the adjustment structure (3). The two air supply sensors (61) and the two exhaust sensors (62) are arranged linearly and evenly on the inner top wall of the box (11).

7. The nitrogen sealing device for storage tanks according to claim 6, characterized in that, The outer side of the box (11) is equipped with three indicator lights (7), which respectively represent air replenishment reminder, normal use, and exhaust reminder.

8. The nitrogen sealing device for storage tanks according to claim 7, characterized in that, The controller (5) is installed inside the housing (11), and the flow meter (24), the drive unit (34), the second electric control valve (42), the air supply sensor (61), the exhaust sensor (62) and the indicator light are all electrically connected to the controller (5).

9. The nitrogen sealing device for storage tanks according to claim 1, characterized in that, A breather valve (81) is installed on the tank body (8), and the end of the breather valve (81) facing away from the tank body (8) is equipped with a male connector (43) that is compatible with the female connector (25).

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