Anti-overfilling protection device for liquefied gas filling

Abstract

The application relates to the technical field of liquefied gas filling, and discloses a liquefied gas filling anti-overfilling protection device, a liquid inlet pipe is arranged in a filling channel at the bottom of an air inlet valve, a ball valve cavity is arranged at the middle position of the liquid inlet pipe, the liquid inlet pipe is provided with a side groove, the side groove is used for improving the spraying efficiency, a ball valve is arranged in the ball valve cavity, and the ball valve is provided with a ball valve hole; a first swing rod is fixedly connected to one side of the ball valve, the first swing rod passes through the side groove, a pull rod is rotatably connected to the end of the ball valve cavity, the other end of the pull rod is rotatably connected to a lever, the other end of the lever is connected to a buoyancy ball, a first support seat is fixedly connected to the top of a bottle body, a lever fulcrum is fixedly connected to the bottom of the first support seat, a rotating ring which is rotatably connected is arranged in the lever fulcrum, the rotating ring is sleeved on the lever, when the buoyancy ball is lifted by buoyancy, the lever is driven to rotate around the rotating ring, so that the pull rod drives the first swing rod to swing downward, the ball valve is driven to rotate, and the second swing rod deviates from the filling channel.

Description

Technical Field

[0001] This invention relates to the field of liquefied petroleum gas (LPG) filling technology, specifically to an overcharge protection device for LPG filling. Background Technology

[0002] The valve on a liquefied petroleum gas (LPG) cylinder only has an on / off function; it does not prevent overfilling. Overfilling can affect the safety of the cylinder and lead to accidents. Normally, the amount of liquid in the cylinder is determined by its weight, and the valve automatically closes when the predetermined weight is reached. If the scale malfunctions, the cylinder will be overfilled. If it's underfilled, liquid may spray into the stove during use, causing a deflagration; if it's overfilled, the pressure will rise with increasing temperature, potentially rupturing the cylinder—a very dangerous situation.

[0003] To address this issue, patent document CN208442580U discloses an overfill-proof liquefied petroleum gas (LPG) cylinder valve. The valve body includes an air inlet channel with a valve switch. An overfill protection device is located at the bottom of the air inlet channel. This device includes a connecting seat with an internal pipe connected to the air inlet channel. An overfill-proof float is hinged to the connecting seat, and the float has an air inlet plug for sealing the internal pipe. The LPG cylinder valve is installed on an LPG cylinder. When the cylinder is filled with LPG, the rising liquid level drives the overfill-proof float to rise. The rising float then drives the plug to seal the internal pipe, preventing further filling and thus preventing overfilling. This LPG cylinder valve has a simple structure, low manufacturing cost, and is suitable for civilian use.

[0004] Based on the problems encountered in the above-mentioned patents and existing technologies, we have found the following defects in LPG filling: 1. Although the method of using buoyancy to close the air inlet channel is convenient, the method of sealing the channel usually involves the plug floating, which will affect the filling speed of LPG under normal conditions; 2. When filling LPG, it is necessary to liquefy the residual gas inside to make it liquefied, and the position of the plug will affect the liquefaction efficiency; 3. The buoyancy sealing effect is poor, and the buoyancy ball will still be blown open during high-pressure filling. Summary of the Invention

[0005] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides an overfill protection device for liquefied petroleum gas (LPG) filling. This device automatically seals the filling channel using the buoyancy of the liquid level inside the bottle upon completion of filling, without affecting the filling speed or condensation efficiency, and provides a good sealing effect. It solves the following problems: While using buoyancy to close the inlet channel is convenient, the method of sealing the channel usually involves the plug floating upwards, which affects the LPG filling speed under normal conditions; during LPG filling, residual gas inside needs to be condensed, and the position of the plug affects the condensation efficiency; the buoyancy sealing effect is poor, and the buoyancy ball can still be forced open during high-pressure filling.

[0006] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: An overfill protection device for liquefied gas filling is installed inside the cylinder and connected to the bottom of the filling channel of the inlet valve. A liquid inlet pipe is provided in the filling channel at the bottom of the inlet valve, and a funnel-shaped liquid outlet is provided at the bottom of the liquid inlet pipe. A support rod is fixed to the side of the liquid inlet pipe, and one end of a lever is rotatably connected to the bottom of the support rod. A buoyancy ball is provided at the other end of the lever, and a plug is provided in the middle part of the lever. When the plug rises, it is used to block the liquid outlet.

[0007] An overfill protection device for liquefied gas filling is installed inside the cylinder body and connected to the bottom of the filling channel of the inlet valve. A liquid inlet pipe is provided in the filling channel at the bottom of the inlet valve. A ball valve cavity is provided in the middle of the liquid inlet pipe. At least one side groove is provided on the side of the ball valve cavity and the side of the lower part of the ball valve cavity. The side groove is used to improve the leaching efficiency. A ball valve is provided in the ball valve cavity. The ball valve has a ball valve hole at the central axis of the corresponding filling channel. A first swing rod is fixedly connected to one side of the ball valve, passing through the side groove. A pull rod is rotatably connected to the end of the ball valve cavity, and the other end of the pull rod is rotatably connected to a lever. The other end of the lever is connected to a buoyancy ball. A first support seat is fixedly connected to the top of the bottle body, and a lever fulcrum is fixedly connected to the bottom of the first support seat. A rotating ring is rotatably connected inside the lever fulcrum and is sleeved on the lever. When the buoyancy ball rises due to buoyancy, it drives the lever to rotate around the rotating ring, thereby causing the pull rod to pull the first swing rod downward, causing the ball valve to rotate and causing the ball valve orifice to deviate from the filling channel.

[0008] Preferably, the other side of the ball valve is also provided with a ball valve hole, which passes through another side groove. The two side grooves are symmetrical to each other. When the liquid level in the bottle is low, the first swing rod is located at the top of the side of the ball valve, and the second swing rod is located at the bottom of the side of the ball valve. The ball valve orifice end is rotatably connected to another pull rod, the other end of which is rotatably connected to a crossbar, and the other end of the lever is fixed to another buoyancy ball; A second support seat is fixedly connected to the top of the bottle body. A piston rod is slidably connected below the second support seat. The bottom of the piston rod is connected to a lever. When the buoyancy ball rises due to buoyancy, the crossbar rises with the buoyancy ball, thereby driving the second swing rod to swing upward. Together with the first swing rod, the ball valve rotates in one direction to close the filling channel.

[0009] Preferably, in addition to the two buoyancy balls mentioned above, the bottle body is provided with multiple buoyancy balls, which are connected together by connecting rods to form a buoyancy ring, and the buoyancy balls on the buoyancy ring are evenly distributed around the circumference.

[0010] Preferably, the buoyancy ball connected to the lever is rotatably connected to the connecting rod to which it is connected.

[0011] Preferably, any pull rod includes upper and lower rod sections, with a sleeve between the two rod sections. A spring is installed inside the sleeve, and the two ends of the spring are respectively connected to the two rod sections. The two rod sections are slidably connected to the two ends inside the sleeve.

[0012] Preferably, any of the buoyancy balls is made of titanium alloy and has a hollow structure.

[0013] Preferably, on the lever, the distance between the rotating ring and the rotation center of the pull rod is less than the distance between the rotating ring and the rotation center of the buoyancy ball, thereby increasing the magnitude of the downward pulling force on the first pendulum rod under the lever principle.

[0014] Preferably, the liquid inlet pipe is divided into two symmetrical separate parts, with a side groove between the two parts. The top of the liquid inlet pipe is connected to the bottom of the air inlet valve by a threaded sleeve. The threaded sleeve fixes the two parts of the liquid inlet pipe by threads, which facilitates the installation of the ball valve and reduces the processing difficulty.

[0015] (III) Beneficial Effects Compared with the prior art, the present invention provides an overcharge protection device for liquefied gas filling, which has the following advantages: 1. This overfill protection device for liquefied petroleum gas (LPG) filling uses a ball valve installed in the filling channel of the inlet valve and a buoyancy ball installed inside the cylinder. When the liquid level rises, the buoyancy ball at one end of the lever rises, causing the pull rod at the other end to fall. This, in turn, drives the first swing rod to rotate the ball valve. After the ball valve rotates, the ball valve orifice deviates from the filling channel, thus completing the sealing. Compared with other sealing methods, the method of the buoyancy ball driving the ball valve to rotate does not obstruct the LPG filling under normal conditions, keeping the filling channel unobstructed from top to bottom. Furthermore, it is not affected by the filling pressure during sealing, requires less force for sealing, and is more efficient.

[0016] 2. The overfill protection device for liquefied gas filling passes through the side groove by a first swing rod set on the side of the air inlet valve. The side groove improves the leaching efficiency and limits the first swing rod, keeping the ball valve and other fixed connecting parts on the ball valve rotating in the plane within the side groove. The side groove is a structure that is already required for the filling port in the prior art. It increases the limiting effect on the ball valve and reduces the processing difficulty after the structural improvement.

[0017] 3. The overcharge protection device for liquefied gas filling connects multiple buoyant balls into a buoyant ring using connecting rods. A second swing rod is set on the other side of the ball valve and connected to another buoyant ball in a symmetrical position via a pull rod and a crossbar. The middle position of the crossbar is connected to the piston rod that slides up and down, while the middle position of the lever is rotatably connected to the rotating ring. Thus, when the buoyant ring rises, the two buoyant balls on both sides drive the first and second swing rods to rotate in the same direction. Compared with a single buoyant ball, the buoyancy of the rising buoyant ring is greater, and the symmetrical structure makes the rising force more uniform. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a liquefied gas cylinder according to Embodiment 1 of the present invention.

[0019] Figure 2 This is a schematic diagram of the overcharge protection device inside the liquefied gas cylinder according to Embodiment 1 of the present invention.

[0020] Figure 3 This is a top view of the liquefied gas cylinder according to Embodiment 1 of the present invention.

[0021] Figure 4 This is an embodiment of the present invention. Figure 3 Cross-sectional view of AA.

[0022] Figure 5 This is an embodiment of the present invention. Figure 4 A magnified view of a portion of region B in the middle.

[0023] Figure 6 This is a schematic diagram of the overcharge protection device after removing the bottle in Embodiment 1 of the present invention.

[0024] Figure 7 This is a schematic diagram of the intake valve according to Embodiment 1 of the present invention.

[0025] Figure 8 This is a schematic diagram of the ball valve and pull rod according to Embodiment 1 of the present invention.

[0026] Figure 9 This is a schematic diagram of the structure of the pull rod according to Embodiment 1 of the present invention.

[0027] Figure 10 This is a schematic diagram of the structure of the first support base in Embodiment 1 of the present invention.

[0028] Figure 11 This is a cross-sectional view of the liquefied gas cylinder according to Embodiment 2 of the present invention.

[0029] Figure 12 This is a schematic diagram of the overcharge protection device according to Embodiment 2 of the present invention.

[0030] In the diagram: 1. Bottle body; 2. Air inlet valve; 4. Buoyancy ring; 11. Support No. 1; 12. Lever fulcrum; 121. Rotating ring; 13. Support No. 2; 14. Piston rod; 21. Liquid inlet pipe; 211. Ball valve chamber; 212. Side groove; 22. Ball valve; 221. Swing rod No. 1; 222. Swing rod No. 2; 223. Ball valve hole; 23. Pull rod; 231. Rod body; 233. Sleeve; 232. Spring; 25. Threaded sleeve; 41. Buoyancy ball; 42. Connecting rod; 43. Lever; 44. Crossbar; 91. Support rod; 92. Liquid outlet; 93. Plug. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] Example 1: This embodiment provides an overcharge protection device for liquefied gas filling, which has the following technical features.

[0035] Please see Figure 1-10An overfill protection device for liquefied gas filling is installed inside the cylinder body 1 and connected to the bottom of the filling channel of the inlet valve 2. An inlet pipe 21 is provided in the filling channel at the bottom of the inlet valve 2. A ball valve cavity 211 is provided in the middle of the inlet pipe 21. At least one side groove 212 is provided on the side of the ball valve cavity 211 and the side of the lower part of the ball valve cavity 211. The side groove 212 is used to improve the leaching efficiency. A ball valve 22 is provided in the ball valve cavity 211. A ball valve hole 223 is provided at the central axis of the corresponding filling channel. A first swing rod 221 is fixedly connected to one side of the ball valve 22. The first swing rod 221 passes through the side groove 212. A pull rod 23 is rotatably connected to the end of the ball valve cavity 211. The other end of the pull rod 23 is rotatably connected to the lever 43. The other end of the lever 43 is connected to the buoyancy ball 41. A first support seat 11 is fixedly connected to the top of the bottle body 1. A lever fulcrum 12 is fixedly connected to the bottom of the first support seat 11. A rotating ring 121 is rotatably connected in the lever fulcrum 12. The rotating ring 121 is sleeved on the lever 43. When the buoyancy ball 41 rises due to buoyancy, it drives the lever 43 to rotate around the rotating ring 121, thereby causing the pull rod 23 to pull the first swing rod 221 to swing downward, driving the ball valve 22 to rotate, causing the ball valve hole 223 to deviate from the filling channel.

[0036] In an optional embodiment, a ball valve hole 223 is also provided on the other side of the ball valve 22. The ball valve hole 223 passes through another side groove 212. The two side grooves 212 are symmetrical to each other. When the liquid level in the bottle body 1 is low, the first swing rod 221 is located at the top of the side of the ball valve 22, and the second swing rod 222 is located at the bottom of the side of the ball valve 22. The end of the ball valve hole 223 is rotatably connected to another pull rod 23. The other end of the pull rod 23 is rotatably connected to the crossbar 44. The other end of the lever 43 is fixed to another buoyancy ball 41. A second support seat 13 is also fixedly connected to the top of the bottle body 1. A piston rod 14 is slidably connected below the second support seat 13. The bottom of the piston rod 14 is connected to the lever 43. When the buoyancy ball 41 rises due to buoyancy, the crossbar 44 rises with the buoyancy ball 41, thereby driving the second swing rod 222 to swing upward. Together with the first swing rod 221, the ball valve 22 rotates in one direction to close the filling channel.

[0037] It should be noted that a limiting structure is set inside the second support seat 13 to limit the distance the piston rod 14 descends, thereby limiting the distance the buoyancy ring 4 descends, and preventing the buoyancy ring 4 from being subjected to excessive downward gravity after the liquid level drops, which would damage other connecting structures.

[0038] In an optional embodiment, in addition to the two buoyancy balls 41 mentioned above, a plurality of buoyancy balls 41 are provided inside the bottle body 1. The buoyancy balls 41 are connected together by a connecting rod 42 to form a buoyancy ring 4. The buoyancy balls 41 on the buoyancy ring 4 are evenly distributed around the circumference.

[0039] It should be noted that the external shape and internal cavity structure of each buoyancy ball 41 are consistent.

[0040] In an alternative embodiment, a buoyancy ball 41 connected to lever 43 is rotatably connected to a connecting rod 42 connected thereto.

[0041] It should be noted that lever 43 can also be rotated and connected to the side of buoyancy ball 41.

[0042] In an optional embodiment, any pull rod 23 includes upper and lower rod sections 231, with a sleeve 233 provided between the two rod sections 231. A spring 232 is provided inside the sleeve 233, with the two ends of the spring 232 respectively connected to the two rod sections 231. The two rod sections 231 are slidably connected to the two ends inside the sleeve 233.

[0043] It should be noted that a limiting structure is provided inside the sleeve 233 to limit the distance the rod 231 can move.

[0044] In an optional embodiment, any of the buoyancy balls 41 is made of titanium alloy and has a hollow structure.

[0045] It should be noted that the shape of the buoyancy ball 41 is a combination of at least one or more of the following: cylinder, cone, frustum of a sphere, prism, or spherical cap. Cylinders are divided into cylinders and prisms, and prisms can be further divided into right prisms and oblique prisms. Cones are divided into cones and pyramids.

[0046] In an optional embodiment, on lever 43, the distance between the rotating ring 121 and the rotation center of the pull rod 23 is less than the distance between the rotating ring 121 and the rotation center of the buoyancy ball 41, thereby increasing the magnitude of the downward pulling force on the first pendulum rod 221 under the action of the lever principle.

[0047] It should be noted that since the rotating ring 121 is sleeved on the lever 43, the distance between the two ends of the lever 43 and the fulcrum, i.e. the rotating ring 121, changes during the upward movement of the buoyancy ball 41. However, the distance between one side of the buoyancy ball 41 and the fulcrum is always greater than or equal to the distance between the other side and the fulcrum.

[0048] In an optional embodiment, the inlet pipe 21 is divided into two symmetrical separate parts, with a side groove 212 between the two parts. The top of the inlet pipe 21 is connected to the bottom of the air inlet valve 2 by a threaded sleeve 25. The threaded sleeve 25 fixes the two parts of the inlet pipe 21 by threads, which facilitates the installation of the ball valve 22 and reduces the difficulty of processing.

[0049] Working principle: When a single buoyancy ball 41 is set, the liquid level rises, and the buoyancy ball 41 rises due to buoyancy, causing the lever 43 to rotate around the rotating ring 121. This causes the pull rod 23 to pull the first swing rod 221 downward, causing the ball valve 22 to rotate and causing the second swing rod 222 to deviate from the filling channel. When multiple buoyancy balls 41 are set to form a buoyancy ring 4, the liquid level rises, and the buoyancy ring 4 rises. The two buoyancy balls 41 on both sides respectively drive the lever 43 to rotate and the crossbar 44 to rise and fall, thereby causing the first swing rod 221 and the second swing rod 222 to rotate in the same direction, thus causing the ball valve 22 to complete the rotation.

[0050] Example 2: This embodiment provides an overcharge protection device for liquefied gas filling, which has the following technical features.

[0051] Please see Figure 11-12 An overfill protection device for liquefied gas filling is installed inside the cylinder body 1 and connected to the bottom of the filling channel of the air inlet valve 2. An inlet pipe 21 is provided in the filling channel at the bottom of the air inlet valve 2. A funnel-shaped outlet 92 is provided at the bottom of the inlet pipe 21. A support rod 91 is fixed to the side of the inlet pipe 21. One end of the lever 43 is rotatably connected to the bottom of the support rod 91. A buoyancy ball 41 is provided at the other end of the lever 43. A plug 93 is provided in the middle part of the lever 43. When the plug 93 rises, it is used to block the outlet 92.

[0052] In summary, this overfill protection device for liquefied gas filling uses a ball valve 22 installed in the filling channel of the inlet valve 2 and a buoyancy ball 41 installed inside the cylinder body 1. When the liquid level rises, the buoyancy ball 41 at one end of the lever 43 rises, causing the pull rod 23 at the other end to fall. This, in turn, drives the first swing rod 221 to rotate the ball valve 22. After the ball valve 22 rotates, the ball valve hole 223 deviates from the filling channel, thus completing the sealing. Compared with other sealing methods, the method of the buoyancy ball 41 driving the ball valve 22 to rotate does not obstruct the filling of liquefied gas under normal conditions, keeping the filling channel unobstructed from top to bottom. Furthermore, it is not affected by the filling pressure during sealing, requires less force for sealing, and is more efficient.

[0053] The overfill protection device for liquefied gas filling passes a first swing rod 221, which is located on the side of the air inlet valve 2, through the side groove 212. The side groove 212 improves the leaching efficiency and limits the first swing rod 221, keeping the ball valve 22 and other fixed connecting parts on the ball valve 22 in a plane within the side groove 212 for rotation. The side groove 212 is a structure that is already required for the filling port in the prior art. It adds a limiting effect on the ball valve 22 and reduces the processing difficulty after the structural improvement.

[0054] This overcharge protection device for liquefied gas filling connects multiple buoyancy balls 41 to form a buoyancy ring 4 via a connecting rod 42. A second swing rod 222 is set on the other side of the ball valve 22 and connected to another buoyancy ball 41 in a symmetrical position via a pull rod 23 and a crossbar 44. The middle position of the crossbar 44 is connected to the piston rod 14 that slides up and down, while the middle position of the lever 43 is rotatably connected to the rotating ring 121. Thus, when the buoyancy ring 4 rises, the two buoyancy balls 41 on both sides drive the first swing rod 221 and the second swing rod 222 to rotate in the same direction. Compared with a single buoyancy ball 41, the buoyancy of the rising buoyancy ring 4 is greater, and the symmetrical structure makes the rising force more uniform.

[0055] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0056] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An overfill protection device for liquefied gas filling, disposed inside the cylinder body (1) and connected to the bottom of the filling channel of the inlet valve (2), wherein an inlet pipe (21) is provided in the filling channel at the bottom of the inlet valve (2), characterized in that, An inlet pipe (21) is provided in the filling channel at the bottom of the air inlet valve (2). A ball valve cavity (211) is provided in the middle of the inlet pipe (21). Two side grooves (212) are provided on the side of the ball valve cavity (211) and on the side of the lower part of the ball valve cavity (211). The side grooves (212) are used to improve the leaching efficiency. A ball valve (22) is provided in the ball valve cavity (211). A ball valve hole (223) is provided at the central axis of the corresponding filling channel of the ball valve (22). A first swing rod (221) is fixedly connected to one side of the ball valve (22). The first swing rod (221) passes through the side groove (212). A pull rod (23) is rotatably connected to the end of the ball valve cavity (211). The other end of the pull rod (23) is rotatably connected to the lever (43). The other end of the lever (43) is connected to the buoyancy ball (41). A first support seat (11) is provided inside the bottle body (1). A lever fulcrum (12) is fixedly connected to the bottom of the first support seat (11). A rotating ring (121) is rotatably connected inside the lever fulcrum (12). The rotating ring (121) is sleeved on the lever (43). When the buoyancy ball (41) is buoyed and rises, it drives the lever (43) to rotate around the lever fulcrum (12), thereby causing the pull rod (23) to pull the first swing rod (221) to swing downward, driving the ball valve (22) to rotate, causing the ball valve hole (223) to deviate from the filling channel. The ball valve (22) is also provided with a second swing rod (222) on the other side. The second swing rod (222) passes through another side groove (212). The two side grooves (212) are symmetrical to each other. When the liquid level in the bottle (1) is low, the first swing rod (221) is located at the top of the side of the ball valve (22), and the second swing rod (222) is located at the bottom of the side of the ball valve (22). The end of the second pendulum (222) is rotatably connected to another pull rod (23), the other end of which is rotatably mounted on a crossbar (44), and the other end of the crossbar (44) is fixed to another buoyancy ball (41). The top of the bottle body (1) is also fixedly connected to a second support seat (13). A piston rod (14) is slidably connected below the second support seat (13). The bottom of the piston rod (14) is connected to the crossbar (44). When the buoyancy ball (41) is lifted by buoyancy, the crossbar (44) rises with the buoyancy ball (41), thereby driving the second swing rod (222) to swing upward. Together with the first swing rod (221), the ball valve (22) rotates in one direction to close the filling channel. In addition to the two buoyancy balls (41) mentioned above, the bottle body (1) is provided with multiple buoyancy balls (41). Each buoyancy ball (41) is connected together by a connecting rod (42) to form a buoyancy ring (4). The buoyancy balls (41) on the buoyancy ring (4) are evenly distributed around the circumference.

2. The overcharge protection device for liquefied gas filling according to claim 1, characterized in that, The buoyancy ball (41) connected to the lever (43) is rotatably connected to the connecting rod (42).

3. The overcharge protection device for liquefied gas filling according to claim 1, characterized in that, Any pull rod (23) includes two rod sections (231) and a sleeve (233) is provided between the two rod sections (231). A spring (232) is provided inside the sleeve (233). The two ends of the spring (232) are respectively connected to the two rod sections (231), and the two rod sections (231) are slidably connected to the two ends inside the sleeve (233).

4. The overcharge protection device for liquefied gas filling according to claim 1, characterized in that, Any buoyancy ball (41) is made of titanium alloy and has a hollow structure.

5. The overcharge protection device for liquefied gas filling according to claim 1, characterized in that, On the lever (43), the distance between the rotating ring (121) and the rotation center of the pull rod (23) is less than the distance between the rotating ring (121) and the rotation center of the buoyancy ball (41).

6. The overcharge protection device for liquefied gas filling according to claim 1, characterized in that, The liquid inlet pipe (21) is divided into two symmetrical individual parts, and the gap between the two parts is a side groove (212). The top of the liquid inlet pipe (21) is connected to the bottom of the air inlet valve (2) by setting a threaded sleeve (25). The threaded sleeve (25) fixes the two parts of the liquid inlet pipe (21) by threads.

Images