Gas cylinder filling anti-overpressure self-locking safety device

Abstract

The utility model discloses a kind of gas cylinder filling anti-overpressure self-locking safety devices, it is related to gas cylinder technical field, including shell, the shell is hollow structure, and gas chamber is equipped in shell middle, and gas chamber outside is equipped with pressurizing chamber;Annular piston is slidably connected in the pressurizing chamber, and annular piston divides pressurizing chamber inside into upper cavity and lower cavity, the upper cavity of pressurizing chamber is sealed environment, and lower cavity bottom is communicated with outside.The gas cylinder filling anti-overpressure self-locking safety device, annular piston displacement is driven by the pressure difference of pressurizing chamber upper and lower cavity, linkage sealing plug automatically opens and closes inflation channel, realizes closed loop pressure control.Full range relies on mechanical structure response, without electronic sensor or complex control system, avoid overpressure risk caused by electronic component failure, especially suitable for flammable, explosive or high electromagnetic interference environment.

Description

Technical Field

[0001] This utility model relates to the field of gas cylinder technology, specifically to a gas cylinder filling overpressure prevention self-locking safety device. Background Technology

[0002] A gas cylinder is a container used to store and transport gases. It is usually made of sturdy metal materials. However, existing cylinders are prone to internal pressure exceeding their capacity during filling, which can lead to danger. Therefore, it is necessary to control the pressure during gas filling.

[0003] To overcome the aforementioned deficiencies, a Chinese patent (publication number: CN114704766B) discloses a safety protection device for preventing overpressure in hydrogen cylinders. This device includes an emergency shut-off valve located downstream of the hydrogen storage cylinder on the hydrogen filling pipeline, a pressure measuring device, and a hydrogen buffer device. The output end of the hydrogen buffer device is equipped with a pressure reducing component and an overpressure protection component for cylinder protection. The pressure reducing component is connected to the cylinder via the filling device, and a safety valve is installed between the filling device and the cylinder. Compared to existing technologies, this device uses a fixing device applicable to cylinders of different sizes to secure the cylinder, preventing external factors such as tilting and collisions from affecting its safety. It also employs a safety protection device that automatically releases pressure and triggers an alarm when overpressure occurs during filling, transmitting the signal to the emergency shut-off valve. These two protective measures effectively stabilize the pressure in the cylinder during hydrogen filling and provide timely alarms in case of problems, reducing losses and hazards caused by hydrogen cylinder explosions.

[0004] While existing technologies can overcome the shortcomings mentioned above, other problems still exist in their operation: during the filling process of gas cylinders, it is necessary to monitor the filling pressure in a timely manner, but the pressure that gas cylinders can withstand varies depending on their specifications, and existing gas cylinder filling overpressure protection devices are not convenient for flexibly adjusting to different pressure levels. Utility Model Content

[0005] The purpose of this utility model is to provide a self-locking safety device for preventing overpressure during gas cylinder filling, in order to solve the problem in the background art that gas cylinders of different specifications can withstand different pressures, and the existing gas cylinder filling overpressure prevention devices are not convenient for flexibly adjusting to different pressure levels.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a gas cylinder filling anti-overpressure self-locking safety device, including a shell, the shell being a hollow structure, with an inflation chamber in the middle of the shell, and a pressurization chamber outside the inflation chamber;

[0007] The pressurizing chamber is slidably connected to an annular piston, which divides the pressurizing chamber into an upper cavity and a lower cavity. The upper cavity of the pressurizing chamber is a sealed environment, while the bottom of the lower cavity is connected to the outside.

[0008] Preferably, an inflation valve and a pressurization valve are respectively installed on the outer side of the outer shell, and the inflation valve is connected to the inflation chamber, and the pressurization valve is connected to the upper cavity of the pressurization chamber.

[0009] Preferably, a flange is fixedly connected to the outer side of the outer shell, and the outer shell is connected to the gas cylinder through the flange, and a sealing structure is formed between the flange and the gas cylinder.

[0010] Preferably, a pressure gauge is installed on the outside of the outer shell, the pressure gauge is connected to the upper cavity of the pressurization chamber, and a connecting rod that is equidistantly distributed in a ring is fixedly connected to the bottom of the annular piston, and a limit plate is fixedly connected to the end of the connecting rod away from the annular piston.

[0011] Preferably, the limiting plate has an opening in the middle, and a sealing plug is fixedly connected to the inner side of the connecting rod. The sealing plug and the limiting plate have mutually aligned openings in the middle, and a rotating shaft is slidably connected between the sealing plug and the limiting plate through the opening. A dynamic seal is formed between the rotating shaft and the sealing plug, and a static seal is formed by the top of the sealing plug fitting against the bottom of the inflation chamber.

[0012] Preferably, a rotating handle is fixedly connected to the top of the rotating shaft, and a limiting block is fixedly connected to the bottom of the rotating shaft. The top of the limiting block and the bottom of the limiting plate fit together to form a locking structure, and a lead screw is provided in the middle of the rotating shaft.

[0013] Preferably, a sealing sleeve is fixedly connected to the top of the inner side of the inflation chamber, and the rotating shaft passes through the sealing sleeve to form a dynamic seal. A threaded sleeve is fixedly connected inside the inflation chamber, and the threaded sleeve is threadedly engaged with the rotating shaft screw.

[0014] Preferably, the bottom of the pressurization chamber is provided with annularly distributed sliding holes and vent holes, and the sliding holes and vent holes are staggered. The sliding holes are slidably connected to the connecting rod, and the vent holes connect the lower cavity of the pressurization chamber to the outside.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] This gas cylinder filling overpressure prevention and self-locking safety device uses the pressure difference between the upper and lower chambers of the pressurization chamber to drive the displacement of a ring piston, which in turn triggers the sealing plug to automatically open and close the filling channel, achieving closed-loop pressure control. The entire process relies on mechanical structure response, eliminating the need for electronic sensors or complex control systems, thus avoiding the risk of overpressure due to electronic component failure. It is particularly suitable for flammable, explosive, or high electromagnetic interference environments.

[0017] The pressure inside the gas cylinder is fed back to the lower chamber of the pressurization chamber in real time through the vent, which drives the annular piston to move and adjusts the opening of the sealing plug. If the gas cylinder is abnormally overpressurized, the air pressure in the lower chamber pushes the annular piston to move further upward, forcing the sealing plug to press more tightly against the bottom of the filling chamber, forming a redundant seal. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is a schematic cross-sectional view of the present invention.

[0020] Figure 3 This is a schematic diagram of the sealing plug lifting structure of this utility model;

[0021] Figure 4 This is a schematic diagram of the sealing plug lowering structure of this utility model;

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the outer shell of this utility model;

[0023] Figure 6 This is a schematic diagram of the cross-sectional structure of the annular piston of this utility model;

[0024] Figure 7 This is a schematic diagram of the threaded sleeve structure of this utility model.

[0025] In the diagram: 1. Outer shell; 2. Inflation chamber; 3. Pressurization chamber; 4. Annular piston; 5. Inflation valve; 6. Pressurization valve; 7. Flange; 8. Pressure gauge; 9. Connecting rod; 10. Limiting plate; 11. Sealing plug; 12. Rotating shaft; 13. Lead screw; 14. Limiting block; 15. Sealing sleeve; 16. Threaded sleeve; 17. Sliding hole; 18. Vent hole. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1: Please refer to Figure 1 - Figure 6This utility model provides the following technical solution: a self-locking safety device for overpressure prevention during gas cylinder filling, comprising a shell 1, the shell 1 being a hollow structure, with an inflation chamber 2 in the middle of the shell 1, and a pressurization chamber 3 on the outside of the inflation chamber 2; an annular piston 4 is slidably connected inside the pressurization chamber 3, and the annular piston 4 divides the interior of the pressurization chamber 3 into an upper cavity and a lower cavity, the upper cavity of the pressurization chamber 3 being a sealed environment, and the bottom of the lower cavity communicating with the outside; an inflation valve 5 and a pressurization valve 6 are respectively installed on the outside of the shell 1, and the inflation valve... 5 is connected to the inflation chamber 2, and the pressurizing valve 6 is connected to the upper cavity of the pressurizing chamber 3; a flange 7 is fixedly connected to the outside of the outer shell 1, and the outer shell 1 is connected to the gas cylinder through the flange 7, and a sealing structure is formed between the flange 7 and the gas cylinder; a pressure gauge 8 is installed on the outside of the outer shell 1, and the pressure gauge 8 is connected to the upper cavity of the pressurizing chamber 3; a connecting rod 9 distributed in a ring at equal intervals is fixedly connected to the bottom of the annular piston 4, and a limit plate 10 is fixedly connected to the end of the connecting rod 9 away from the annular piston 4; the limit plate 10 has an opening in the middle, and the connecting rod A sealing plug 11 is fixedly connected to the inner side of the 9th chamber. The sealing plug 11 and the limiting plate 10 have aligned openings between them. A rotating shaft 12 is slidably connected between the sealing plug 11 and the limiting plate 10 through the openings, forming a dynamic seal between the rotating shaft 12 and the sealing plug 11. The top of the sealing plug 11 is in contact with the bottom of the inflation chamber 2 to form a static seal. A rotating handle is fixedly connected to the top of the rotating shaft 12, and a limiting block 14 is fixedly connected to the bottom of the rotating shaft 12. The top of the limiting block 14 and the bottom of the limiting plate 10 are in contact with each other to form a locking structure. Furthermore, a lead screw 13 is provided in the middle of the rotating shaft 12; a sealing sleeve 15 is fixedly connected to the top of the inner side of the inflation chamber 2, and the rotating shaft 12 passes through the sealing sleeve 15 to form a dynamic seal; a threaded sleeve 16 is fixedly connected inside the inflation chamber 2, and the threaded sleeve 16 is threadedly engaged with the lead screw 13 of the rotating shaft 12; the bottom of the pressurization chamber 3 is provided with annularly distributed sliding holes 17 and vent holes 18, and the sliding holes 17 and vent holes 18 are staggered. The interior of the sliding holes 17 is slidably connected to the connecting rod 9, and the vent holes 18 connect the lower cavity of the pressurization chamber 3 to the outside.

[0028] When using the device, first install the entire assembly onto the end of the gas cylinder via flange 7, ensuring a sealed structure between flange 7 and the gas cylinder. After installation, drive the rotating shaft 12 to rotate inside the inflation chamber 2 using the handle on top of the shaft 12. At this time, the rotating shaft 12 will drive the lead screw 13 to rotate inside the threaded sleeve 16, causing the rotating shaft 12 to move upward inside the inflation chamber 2.

[0029] As the rotating shaft 12 moves upward, it will drive the limiting block 14 to move upward, and through the limiting block 14, it will drive the limiting plate 10 and the connecting rod 9 to move upward until the sealing plug 11 on the inner side of the connecting rod 9 and the bottom of the inflation chamber 2 are in contact with each other. When the sealing plug 11 and the bottom of the inflation chamber 2 are in contact with each other, the inside of the inflation chamber 2 is in a sealed state.

[0030] Meanwhile, since the position of the limiting plate 10 is fixed by the engaging structure formed by the limiting block 14 and the rotating shaft 12, the relative positions of the connecting rod 9 mounted on the top of the limiting plate 10 and the annular piston 4 will remain unchanged, that is, the position of the annular piston 4 inside the pressurizing chamber 3 is fixed. In this state, gas can be injected into the pressurizing chamber 3 through the pressurizing valve 6, and the injected gas will be located in the upper cavity of the pressurizing chamber 3. At this time, the pressure gauge 8 is connected to the upper cavity of the pressurizing chamber 3, displaying the pressure value inside the pressurizing chamber. As gas is injected, the pressure inside the upper cavity of the pressurizing chamber 3 gradually increases until it reaches the predetermined gas pressure in the gas cylinder.

[0031] Once the air pressure inside the upper chamber of the pressurization chamber 3 reaches a predetermined value, the user can rotate the shaft 12 to move it downwards. At this time, the air pressure inside the pressurization chamber 3 will push the annular piston 4 downwards, and the annular piston 4 will push the connecting rod 9 and the limiting plate 10 downwards together. At the same time, the sealing plug 11 on the inner side of the connecting rod 9 will separate from the bottom of the inflation chamber 2, thereby enabling the inflation process to begin.

[0032] As the annular piston 4 moves downward, the internal air pressure in the upper cavity of the pressurization chamber 3 decreases. At this time, air is pumped into the inflation chamber 2 through the inflation valve 5. The pumped gas will then enter the gas cylinder through the inflation chamber 2.

[0033] The lower chamber of the pressurization chamber 3 is connected to the inside of the gas cylinder through the vent 18. During the inflation process, as the gas pressure inside the gas cylinder gradually increases, the pressure is transmitted to the lower chamber of the pressurization chamber 3, which pushes the annular piston 4 upward. At this time, the gas pressure inside the annular piston 4 will also gradually increase, and through the annular piston 4, it will drive the connecting rod 9 and the limiting plate 10 to move upward.

[0034] As the sealing plug 11 on the inner side of the connecting rod 9 gradually approaches the bottom of the inflation chamber 2, the annular piston 4 will return to its initial position when the sealing plug 11 contacts the connecting rod 9. This means that the air pressure inside the upper and lower chambers of the pressurization chamber 3 will remain consistent, while the air pressure inside the gas cylinder will be maintained at a predetermined value. At the same time, the sealing plug 11 and the connecting rod 9 together isolate the inside of the inflation chamber 2 and the inside of the gas cylinder, effectively preventing gas from continuing to enter the gas cylinder.

[0035] After the gas cylinder is filled, the user can rotate the shaft 12 to move it upwards. The limiting block 14 at the bottom of the shaft 12 will fix the limiting plate 10, ensuring the stability and safety of the entire device.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" or "linked" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral connection; it can refer to a mechanical connection or an electrical connection; it can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas cylinder filling anti-overpressure self-locking safety device, comprising a shell (1), wherein the shell (1) is a hollow structure, and an inflation chamber (2) is provided in the middle of the shell (1), and a pressurization chamber (3) is provided on the outside of the inflation chamber (2); Its features are: The pressurization chamber (3) is slidably connected to an annular piston (4), which divides the interior of the pressurization chamber (3) into an upper cavity and a lower cavity. The upper cavity of the pressurization chamber (3) is a sealed environment, and the bottom of the lower cavity is connected to the outside.

2. The gas cylinder filling overpressure prevention self-locking safety device according to claim 1, characterized in that: An inflation valve (5) and a pressure valve (6) are respectively installed on the outer side of the outer shell (1), and the inflation valve (5) is connected to the inflation chamber (2), and the pressure valve (6) is connected to the upper cavity of the pressure chamber (3).

3. The gas cylinder filling overpressure prevention self-locking safety device according to claim 2, characterized in that: A flange (7) is fixedly connected to the outside of the outer shell (1), and the outer shell (1) is connected to the gas cylinder through the flange (7), and a sealing structure is formed between the flange (7) and the gas cylinder.

4. The gas cylinder filling overpressure prevention self-locking safety device according to claim 3, characterized in that: A pressure gauge (8) is installed on the outside of the outer shell (1). The pressure gauge (8) is connected to the upper cavity of the pressurization chamber (3). A connecting rod (9) is fixedly connected to the bottom of the annular piston (4) in an annular and equidistant arrangement. A limit plate (10) is fixedly connected to the end of the connecting rod (9) away from the annular piston (4).

5. The gas cylinder filling overpressure prevention self-locking safety device according to claim 4, characterized in that: The limiting plate (10) has an opening in the middle, and a sealing plug (11) is fixedly connected to the inner side of the connecting rod (9). The sealing plug (11) and the limiting plate (10) have openings that are aligned with each other. The sealing plug (11) and the limiting plate (10) are slidably connected to a rotating shaft (12) through the opening. A dynamic seal is formed between the rotating shaft (12) and the sealing plug (11), and the top of the sealing plug (11) is fitted with the bottom of the inflation chamber (2) to form a static seal.

6. The gas cylinder filling overpressure prevention self-locking safety device according to claim 5, characterized in that: The top of the rotating shaft (12) is fixedly connected to a rotating handle, and the bottom of the rotating shaft (12) is fixedly connected to a limiting block (14). The top of the limiting block (14) and the bottom of the limiting plate (10) fit together to form a locking structure, and a lead screw (13) is provided in the middle of the rotating shaft (12).

7. The gas cylinder filling overpressure prevention self-locking safety device according to claim 1, characterized in that: A sealing sleeve (15) is fixedly connected to the top of the inner side of the inflation chamber (2), and the rotating shaft (12) passes through the sealing sleeve (15) to form a dynamic seal. A threaded sleeve (16) is fixedly connected inside the inflation chamber (2), and the threaded sleeve (16) is threadedly engaged with the screw (13) of the rotating shaft (12).

8. The gas cylinder filling overpressure prevention self-locking safety device according to claim 1, characterized in that: The bottom of the pressurization chamber (3) is provided with annularly distributed sliding holes (17) and vent holes (18), and the sliding holes (17) and vent holes (18) are staggered. The interior of the sliding holes (17) is slidably connected to the connecting rod (9), and the vent holes (18) connect the lower cavity of the pressurization chamber (3) to the outside.

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