Pressure container capable of preventing repeated use

Abstract

The pressure container comprises a container body, an air tap and a valve core, the air tap is fixedly installed in an opening of the container body, a through hole is formed in the center of the air tap, the valve core comprises a core seat and a core rod, the core seat is fixedly installed in the through hole, the core rod is installed in the core seat, and the two ends of the core rod extend out of the core seat; the one-way plug is installed in the through hole in a sliding mode, the hole diameter of the end, located in the container body, of the through hole is reduced to form a hole shrinkage part, the one-way plug sequentially comprises an extending part and a blocking part, the outer diameter of the extending part is smaller than the hole diameter of the hole shrinkage part, and the outer diameter of the blocking part is larger than the hole diameter of the hole shrinkage part; the extending part is provided with a blocking protrusion with the outer diameter larger than the hole diameter of the shrinkage hole part. After the scheme is adopted, the appearance and the structure of the pressure vessel are prevented from being greatly changed, and the repeated use prevention of the pressure vessel is realized on the premise of ensuring that the manufacturing process and the material cost of the pressure vessel are not increased.

Description

Technical Field

[0001] The invention relates to the technical field of pressure vessels, and in particular to an anti-reuse pressure vessel. Background Art

[0002] A pressure vessel is a closed device that contains gas or liquid and bears a certain pressure. Most pressure vessels are made of steel, but some are made of non-ferrous metals such as aluminum and titanium, and non-metallic materials such as fiberglass and prestressed concrete. A liquefied gas bottle is a common pressure vessel, mainly used to store liquefied gas.

[0003] However, safety accidents involving pressure vessels still occur from time to time. One common reason is that the pressure vessel is overused or used too many times. The principle is that during repeated use, the fatigue of the material will continue to deepen, and material fatigue will lead to the generation and expansion of cracks, which may eventually lead to the rupture or explosion of the container, causing casualties and property losses. In some single-use occasions, in order to effectively control costs, the wall thickness of the pressure vessel is accurately calculated, and it is only allowed to be pressurized and released once. However, there are still some unscrupulous vendors who recycle such pressure vessels and resell them, which poses serious safety hazards.

[0004] To avoid the above situation, some anti-reuse pressure vessels or pressure vessels with anti-reuse structures have appeared on the market. For example, the Chinese utility model patent with application number "201920326030.X" and titled "Anti-reuse steel cylinder" introduces a pressure vessel, which is made thicker at the lower end of the valve body than at the upper end by arranging a sheath on the outer valve body and fixing the sheath to the bottle body or valve body. In the process of cutting off the safety valve, due to the actual situation, the valve body of the safety valve cannot be completely cut off, and the end of the valve body left on the bottle body will be thicker than the normal valve body. After the criminals simply weld a new safety valve, there will be very obvious welding marks and a thicker lower section at the welding point, which can easily identify this type of steel cylinder as an illegal steel cylinder, avoid consumers from buying it, and also let the criminals give up refurbishing it and pretending to be it. The identification code marked on the sheath will also be incomplete due to the cutting of the sheath, which further helps consumers identify this type of steel cylinder.

[0005] However, the addition of the jacket has caused significant changes and impacts on the appearance and structure of the pressure vessel, and has also increased the manufacturing process and material costs of the pressure vessel, and the practical effect is general. Summary of the invention

[0006] In view of the defects of the prior art, the technical problem to be solved by the present invention is to provide a pressure vessel that prevents reuse, avoids major changes to the appearance and structure of the pressure vessel, and ensures that the manufacturing process and material costs of the pressure vessel are not increased, while achieving the prevention of reuse of the pressure vessel.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A reusable pressure vessel comprises a container body, an air nozzle and an air valve core, the air nozzle being fixedly installed in the opening of the container body, a through hole being provided in the center of the air nozzle, the valve core comprising a core seat and a core rod, the core seat being fixedly installed in the through hole, the core rod being installed in the core seat and extending out of the core seat at both ends, and further comprising a one-way plug, the one-way plug being slidably installed in the through hole, the through hole being located at one end of the container body and having a reduced aperture to form a shrinkage hole portion, the one-way plug comprising an extending portion and a sealing portion in sequence, the outer diameter of the extending portion being smaller than the aperture of the shrinkage hole portion and the outer diameter of the sealing portion being larger than the aperture of the shrinkage hole portion, the extending portion being provided with a blocking protrusion with an outer diameter larger than the aperture of the shrinkage hole portion, the one-way plug being completely located in the through hole when the core rod is retracted and when the core rod is partially extended during normal inflation, and the end of the core rod pushes the blocking protrusion through the shrinkage hole portion when the core rod is fully extended.

[0009] In the traditional valve core design, the core rod usually has a certain amount of extra movement stroke, which provides a safety buffer to prevent damage caused by air pressure fluctuations. However, in daily inflation and deflation operations, this extra stroke is not actually used. The present invention cleverly utilizes this extra stroke of the core rod to achieve the function of preventing the pressure vessel from being reused.

[0010] The specific working principle of the present invention is as follows: when the medium is first charged into the container body, the user only needs to lightly press the exposed core rod end to make the core rod partially extend out of the through hole, thereby connecting the inflation path with the through hole. Since the one-way plug is completely located inside the through hole at this time, the medium can smoothly enter the container body through the shrinkage hole. After the inflation operation is completed, the user presses the exposed core rod again to make the core rod push the blocking part of the one-way plug, so that the extended part of the one-way plug passes through the shrinkage hole until the core rod is fully extended in the through hole. At this time, the extended part of the one-way plug and the blocking protrusion on the extended part will completely pass through the shrinkage hole; then release the core rod, so that the core rod naturally retracts under the action of the spring. At this time, since the container body is filled with medium, the pressure exerted by the medium on the blocking protrusion makes it fit tightly against the lower surface of the gas nozzle, thereby preventing the one-way plug from returning to the through hole, thereby achieving the locking of the one-way plug. When you want to deflate, you need to press the exposed end of the core rod to make the core rod contact the sealing part of the one-way plug and push the one-way plug down, but do not completely make the sealing part contact the shrinkage part, so as to form a medium flow channel between the gas nozzle and the container body to complete the deflation operation. When someone tries to fill the medium a second time, the higher pressure of the external medium will push the one-way plug toward the shrinkage part; because the diameter of the one-way plug's sealing part is larger than the diameter of the shrinkage part, this will cause the sealing part to automatically close the shrinkage part, preventing new medium from entering, thereby preventing the container from being reused.

[0011] The solution of the present invention does not need to add additional complex structures, and only uses the redundant stroke of the core rod to achieve the function of preventing reuse, which not only simplifies the design of the container, but also reduces the manufacturing cost. At the same time, the operation process is simple, and the user can achieve the purpose of preventing reuse by simply performing a conventional pressing operation on the valve core.

[0012] Preferably, the protruding portion includes a head and a neck, the blocking protrusion is arranged between the head and the neck, and the head is conical. In this way, the conical head plays a good guiding role, so that the one-way plug can be aligned and enter the shrinkage portion more smoothly during the movement, reducing the risk of deviation or jamming. Moreover, compared with a flat head or other shapes, the conical head can gradually compress the surrounding medium when entering the shrinkage portion, thereby reducing the friction and resistance during the entry process, making the entire movement smoother.

[0013] Preferably, the blocking portion is a column with a cross-section that is the same as the cross-section of the through hole, and the length of the blocking portion is not less than one-quarter of the overall length of the one-way plug. The cross-sectional shape of the blocking portion is completely consistent with the through hole, ensuring that the one-way plug can move along the correct path when pushed by the core rod, avoiding the problem of offset or misalignment. Moreover, since the blocking length is at least one-quarter of the overall length of the one-way plug, the longer columnar structure provides stable support, making it less likely for the one-way plug to tilt during movement. This not only reduces the risk of jamming, but also ensures that the one-way plug can smoothly pass through the shrinkage portion.

[0014] Preferably, the outer cylindrical surface of the sealing part is in abutment with the through hole, and a through groove extending along the axial direction of the one-way plug is provided on the outer cylindrical surface of the sealing part. After the through groove is provided, it is ensured that the end face of the sealing part can still completely cover the shrinkage part. Since the sealing part and the through hole are completely in abutment with each other, the one-way plug is stably supported during the entire movement process, and the tilting phenomenon is effectively prevented. Even under high pressure, the one-way plug can maintain good movement characteristics and avoid operational failures caused by tilting. The provision of the through groove allows the passage of the medium without affecting the inflation and deflation operations at all. However, although the through groove is provided on the sealing part, its end face can still completely cover the shrinkage part, ensuring that the sealing part can still achieve reliable sealing when needed.

[0015] Preferably, the plugging portion and the neck portion are connected by a conical transition. In this way, the contact between the plugging portion and the shrinkage portion is transformed from surface contact to point contact through the conical surface, and the conical transition connection significantly enhances the sealing performance. Point contact can maintain sealing at higher pressures, reduce the possibility of medium leakage, and does not require additional components, simplifying the overall structure of the one-way plug.

[0016] Preferably, a sealing ring is further provided between the sealing portion and the neck portion. The presence of the sealing ring provides an additional sealing layer for the contact between the sealing portion and the shrinkage portion, forming a physical barrier and elastic compensation, and effectively preventing leakage of the medium. Even under high pressure or extreme environments, a reliable sealing effect can be ensured. Compared with the method of connecting the sealing portion and the neck portion with a conical transition, this method greatly reduces the manufacturing and processing accuracy requirements for the one-way plug and the shrinkage portion, because the sealing ring can compensate for a certain dimensional tolerance.

[0017] Preferably, the neck is a cylinder with a cross-section that is the same as the cross-section of the shrinkage hole part, and a ventilation groove extending along the axial direction of the one-way plug is provided on the cylindrical surface of the neck. In this way, the neck adopts a cylindrical design with the same cross-section shape as the shrinkage hole part, which increases its overall rigidity and structural stability. This design can effectively resist external pressure and mechanical stress, reduce the risk of deformation or damage, and provide stronger structural support, especially under high-pressure environments. Although the neck adopts a cylindrical design to enhance strength, ventilation grooves extending along the axial direction of the one-way plug are provided on the cylindrical surface to ensure smooth flow of the medium during inflation and deflation. These ventilation grooves not only do not affect the ventilation area, but also maintain good gas exchange efficiency, ensuring the normal operation of the system. During the deflation process, there is no need to press the core rod deeply. Just press the core rod lightly to form a passage for the through hole and the container body for the medium to flow, making the operation more convenient.

[0018] Preferably, the side of the blocking protrusion facing the head is conical, and the side of the blocking protrusion facing the neck is flat. The side of the blocking protrusion facing the head is conical, so that it can pass through the shrinkage portion more easily and smoothly when the core rod pushes the one-way plug. The conical structure plays a good guiding role, reducing the resistance and friction during the entry process, and ensuring the smooth operation. The side of the blocking protrusion facing the neck is flat, and when the one-way plug completely passes through the shrinkage portion, the flat part can be firmly attached to the end face of the shrinkage portion, forming an effective physical barrier to prevent the one-way plug from retreating into the through hole.

[0019] Preferably, the blocking protrusion is made of elastic material. In this way, the blocking protrusion can pass through the shrinkage hole more smoothly, reducing the risk of jamming. After completely passing through the shrinkage hole, the blocking protrusion will quickly return to its original shape, ensuring that the blocking protrusion can immediately form a stable support with the lower surface of the air nozzle.

[0020] Preferably, the cross section of the ventilation groove is arc-shaped. The arc-shaped ventilation groove can provide a smoother airflow channel, reduce the resistance when the gas flows, and thus improve the ventilation efficiency. The arc-shaped design helps to evenly distribute the gas, avoids the formation of dead corners in the ventilation groove, reduces the possibility of gas accumulation, and ensures the smooth flow of gas.

[0021] In summary, such an anti-reuse pressure vessel avoids major changes to the appearance and structure of the pressure vessel, and achieves the anti-reuse of the pressure vessel under the premise of ensuring that the manufacturing process and material costs of the pressure vessel do not increase. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Figure 1 is a schematic structural diagram of the anti-reuse pressure vessel of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the one-way plug in the anti-reuse pressure container of the present invention;

[0025] Figure 3 It is a schematic diagram of the structure of a one-way plug of conventional design;

[0026] Figure 4 It is a schematic diagram of the structure of the gas nozzle and the gas valve core in the anti-reusable pressure container of the present invention;

[0027] Figure 5 It is a structural schematic diagram of a one-way plug with a through groove in the anti-reuse pressure vessel of the present invention;

[0028] Figure 6 It is a structural schematic diagram of a one-way plug with a sealing ring in the anti-reuse pressure container of the present invention;

[0029] Figure 7 It is a bottom view of a one-way plug with a circular arc-shaped vent groove in the anti-reuse pressure container of the present invention;

[0030] Figure 8 It is a schematic diagram of the anti-reuse pressure container of the present invention in a state where the medium is not filled or before the medium is first filled;

[0031] Fig. 9 It is a schematic diagram of pushing the one-way plug out of the shrinkage hole portion in the anti-reuse pressure container of the present invention;

[0032] Fig.10 It is a schematic diagram of the state of the one-way plug after the medium is first filled in the anti-reuse pressure container of the present invention;

[0033] Fig.11 It is a schematic diagram showing that the shrinkage hole portion is blocked by the blocking portion when the anti-reuse pressure container of the present invention is filled with a medium for the second time.

[0034] in,

[0035] 1-container body;

[0036] 2-air nozzle; 21-through hole; 22-shrinkage portion;

[0037] 3-valve core; 31-core seat; 32-core rod;

[0038] 4- one-way plug; 41- extension portion; 411- blocking protrusion; 412- head; 413- neck; 42- blocking portion; 421- through groove; 43- ventilation groove;

[0039] 5- Sealing ring. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0041] Reference Figure 1 , Figure 2 , Figure 4 and Figure 8 As shown, a reusable pressure vessel includes a container body 1, a gas nozzle 2 and a valve core 3. The gas nozzle 2 is fixedly installed in the opening of the container body 1. A through hole 21 is provided in the center of the gas nozzle 2. The valve core 3 includes a core seat 31 and a core rod 32. The core seat 31 is fixedly installed in the through hole 21. The core rod 32 is installed in the core seat 31 and both ends extend out of the core seat 31. The valve core 3 also includes a one-way plug 4. The one-way plug 4 is slidably installed in the through hole 21. The through hole 21 is located in the container body 1. The aperture of one end is reduced to form a shrinkage hole The one-way plug 4 comprises a protruding portion 41 and a blocking portion 42 in sequence. The outer diameter of the protruding portion 41 is smaller than the aperture of the shrinkage hole portion 22, while the outer diameter of the blocking portion 42 is larger than the aperture of the shrinkage hole portion 22. A blocking protrusion 411 with an outer diameter larger than the aperture of the shrinkage hole portion 22 is provided on the protruding portion 41. When the core rod 32 is retracted and when the core rod 32 is partially extended during normal inflation, the one-way plug 4 is completely located in the through hole 21. When the core rod 32 is fully extended, the end of the core rod 32 pushes the blocking protrusion 411 to pass through the shrinkage hole portion 22.

[0042] Reference Figure 8-Figure 11 As shown, in the conventional valve core 3 design, the core rod 32 usually has a certain amount of extra movement stroke, and this redundant stroke provides a safety buffer to prevent damage caused by air pressure fluctuations. However, in daily inflation and deflation operations, this redundant stroke is not actually used. The present invention ingeniously utilizes this redundant stroke of the core rod 32 to achieve the function of preventing the pressure vessel from being reused.

[0043] The specific working principle of the present invention is as follows: when the medium is filled into the container body 1 for the first time, the user only needs to lightly press the exposed end of the core rod 32 to make the core rod 32 partially extend out of the through hole 21, thereby connecting the inflation path with the through hole 21. Since the one-way plug 4 is completely located inside the through hole 21 at this time, the medium can smoothly enter the container body 1 through the shrinkage hole 22. After the inflation operation is completed, the user presses the exposed core rod 32 again, so that the core rod 32 pushes the blocking portion 42 of the one-way plug 4, allowing the protruding portion 41 of the one-way plug 4 to pass through the shrinkage portion 22 until the core rod 32 is fully extended in the through hole 21. At this time, the protruding portion 41 of the one-way plug 4 and the blocking protrusion 411 located on the protruding portion 41 will completely pass through the shrinkage portion 22; then release the core rod 32, so that the core rod 32 naturally retracts under the action of the spring. At this time, since the container body 1 is filled with medium, the pressure exerted by the medium on the blocking protrusion 411 makes it fit tightly against the lower surface of the air nozzle 2, thereby preventing the one-way plug 4 from returning to the through hole 21, thereby achieving the locking of the one-way plug 4. When degassing is desired, the exposed end of the core rod 32 is pressed to make the core rod 32 contact the sealing portion 42 of the one-way plug 4, and the one-way plug 4 is pushed downward, but the sealing portion 42 is not completely in contact with the shrinking hole portion 22, so as to form a medium flow channel between the gas nozzle 2 and the container body 1, and the degassing operation is completed. When someone attempts to refill the medium, the higher pressure of the external medium will push the one-way plug 4 toward the shrinking hole portion 22; since the diameter of the sealing portion 42 of the one-way plug 4 is larger than the diameter of the shrinking hole portion 22, this will cause the sealing portion 42 to automatically close the shrinking hole portion 22, preventing new medium from entering, thereby preventing the container from being reused.

[0044] The solution of the present invention does not need to add additional complex structures, and only uses the redundant stroke of the core rod 32 to achieve the function of preventing reuse, which not only simplifies the design of the container, but also reduces the manufacturing cost. At the same time, the operation process is simple, and the user only needs to perform a conventional pressing operation on the valve core 3 to achieve the purpose of preventing reuse.

[0045] In addition, refer to Figure 2 As shown, the extension portion 41 includes a head 412 and a neck 413, and the blocking protrusion 411 is arranged between the head 412 and the neck 413, and the head 412 is conical. In this way, the conical head 412 plays a good guiding role, so that the one-way plug 4 can be more smoothly aligned and enter the shrinkage hole 22 during the movement, reducing the risk of deviation or jamming. Moreover, compared with a flat head or other shapes (refer to Figure 3 As shown, the conical head 412 can gradually compress the surrounding medium when entering the shrinkage hole portion 22, thereby reducing the friction and resistance during the entry process and making the entire action smoother.

[0046] In addition, refer to Figure 2As shown, the blocking portion 42 is a column with the same cross-sectional shape as the through hole 21, and the length of the blocking portion 42 is not less than one-quarter of the overall length of the one-way plug 4. The cross-sectional shape of the blocking portion 42 is completely consistent with the through hole 21, ensuring that the one-way plug 4 can move along the correct path when pushed by the core rod 32, avoiding the problem of offset or misalignment. Moreover, since the blocking portion 42 is at least one-quarter of the overall length of the one-way plug 4, the longer columnar structure provides stable support, making it difficult for the one-way plug 4 to tilt during movement. This not only reduces the risk of jamming, but also ensures that the one-way plug 4 can smoothly pass through the shrinkage portion 22.

[0047] In addition, refer to Figure 5 As shown, the outer cylindrical surface of the blocking portion 42 is in contact with the through hole 21, and a through groove 421 extending along the axial direction of the one-way plug 4 is provided on the outer cylindrical surface of the blocking portion 42. After the through groove 421 is provided, it is ensured that the end face of the blocking portion 42 can still completely cover the shrinkage hole portion 22. Since the blocking portion 42 is completely in contact with the through hole 21, the one-way plug 4 is stably supported during the entire movement process, effectively preventing the occurrence of tilting. Even under high pressure, the one-way plug 4 can maintain good movement characteristics and avoid operational failures caused by tilting. The provision of the through groove 421 allows the passage of the medium without affecting the inflation and deflation operations at all. However, although the through groove 421 is provided on the blocking portion 42, its end face can still completely cover the shrinkage hole portion 22, ensuring that the blocking portion 42 can still achieve reliable sealing when needed.

[0048] In addition, refer to Figure 2 As shown, the plugging portion 42 and the neck portion 413 are connected by a conical transition. In this way, the contact between the plugging portion 42 and the shrinkage portion 22 is transformed from surface contact to point contact through the conical surface, and the conical transition connection significantly enhances the sealing performance. Point contact can maintain sealing at higher pressures, reduce the possibility of medium leakage, and does not require additional components, simplifying the overall structure of the one-way plug 4.

[0049] In addition, refer to Figure 6 As shown, a sealing ring 5 is also provided between the plugging portion 42 and the neck portion 413. The presence of the sealing ring 5 provides an additional sealing layer for the contact between the plugging portion 42 and the shrinkage portion 22, forming a physical barrier and elastic compensation, and effectively preventing medium leakage. Even under high pressure or extreme environments, a reliable sealing effect can be ensured. Compared with the method of connecting the plugging portion 42 and the neck portion 413 with a conical transition, this method greatly reduces the manufacturing and processing accuracy requirements for the one-way plug 4 and the shrinkage portion 22, because the sealing ring 5 can compensate for a certain dimensional tolerance.

[0050] In addition, refer to Figure 2As shown, the neck 413 is a column with the same cross-sectional shape as the shrinkage hole portion 22, and a vent groove 43 extending axially along the one-way plug 4 is provided on the cylindrical surface of the neck 413. In this way, the neck 413 adopts a column design with the same cross-sectional shape as the shrinkage hole portion 22, which increases its overall rigidity and structural stability. This design can effectively resist external pressure and mechanical stress, reduce the risk of deformation or damage, and provide stronger structural support, especially in high-pressure environments. Although the neck 413 adopts a column design to enhance strength, a vent groove 43 extending axially along the one-way plug 4 is provided on the cylindrical surface to ensure smooth flow of the medium during inflation and deflation. These vent grooves 43 not only do not affect the ventilation area, but also maintain good gas exchange efficiency, ensuring the normal operation of the system. During the deflation process, there is no need to press the core rod 32 deeply, and only need to press the core rod 32 lightly to form a passage for the medium to flow through the through hole 21 and the container body 1, making the operation more convenient.

[0051] In addition, refer to Figure 2 As shown, the side of the blocking protrusion 411 facing the head 412 is conical, and the side of the blocking protrusion 411 facing the neck 413 is flat. The side of the blocking protrusion 411 facing the head 412 is conical, so that it can pass through the shrinkage portion 22 more easily and smoothly when the core rod 32 pushes the one-way plug 4. The conical structure plays a good guiding role, reducing the resistance and friction during the entry process, and ensuring the smooth operation. The side of the blocking protrusion 411 facing the neck 413 is flat. When the one-way plug 4 completely passes through the shrinkage portion 22, the flat part can be firmly attached to the end face of the shrinkage portion 22, forming an effective physical barrier to prevent the one-way plug 4 from retreating into the through hole 21.

[0052] In addition, the blocking protrusion 411 is made of elastic material. In this way, the blocking protrusion 411 passes through the shrinkage hole 22 more smoothly, reducing the risk of jamming. After completely passing through the shrinkage hole 22, the blocking protrusion 411 will quickly return to its original state, ensuring that the blocking protrusion 411 can immediately form a stable support with the lower surface of the air nozzle 2.

[0053] In addition, refer to Figure 7 As shown, the cross section of the ventilation groove 43 is arc-shaped. The arc-shaped ventilation groove 43 can provide a relatively smooth air flow channel, reduce the resistance when the gas flows, and thus improve the ventilation efficiency. The arc-shaped design helps to evenly distribute the gas, avoids the formation of dead corners in the ventilation groove 43, reduces the possibility of gas accumulation, and ensures the smooth flow of gas.

[0054] In summary, such an anti-reuse pressure vessel avoids major changes to the appearance and structure of the pressure vessel, and achieves the anti-reuse of the pressure vessel under the premise of ensuring that the manufacturing process and material costs of the pressure vessel do not increase.

[0055] In short, the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An anti-reuse pressure container, comprising a container body, a gas nozzle and a valve core, wherein the gas nozzle is fixedly installed in the opening of the container body, a through hole is provided in the center of the gas nozzle, the valve core comprises a core seat and a core rod, the core seat is fixedly installed in the through hole, the core rod is installed in the core seat and both ends extend out of the core seat, characterized in that: It also includes a one-way plug, which is slidably installed in a through hole. The through hole is located at one end of the container body and has a reduced diameter to form a shrinkage hole portion. The one-way plug includes an extension portion and a sealing portion in sequence. The outer diameter of the extension portion is smaller than the diameter of the shrinkage hole portion, while the outer diameter of the sealing portion is larger than the diameter of the shrinkage hole portion. A blocking protrusion with an outer diameter larger than the diameter of the shrinkage hole portion is provided on the extension portion. When the core rod is retracted and when the core rod is partially extended during normal inflation, the one-way plug is completely located in the through hole. When the core rod is fully extended, the end of the core rod pushes the blocking protrusion through the shrinkage hole portion.

2. The anti-reuse pressure container according to claim 1, characterized in that: The protruding portion comprises a head and a neck, the blocking protrusion is arranged between the head and the neck, and the head is conical.

3. The anti-reuse pressure container according to claim 2, characterized in that: The blocking portion is a column with a cross-section having the same shape as that of the through hole, and the length of the blocking portion is not shorter than one quarter of the overall length of the one-way plug.

4. The anti-reuse pressure container according to claim 2, characterized in that: The outer cylindrical surface of the blocking part is in contact with the through hole, and a through groove extending along the axial direction of the one-way plug is opened on the outer cylindrical surface of the blocking part. After the through groove is opened, it is ensured that the end face of the blocking part can still completely cover the shrinkage hole part.

5. The anti-reuse pressure container according to claim 2, characterized in that: The blocking portion and the neck portion are connected via a conical transition.

6. The anti-reuse pressure container according to claim 2, characterized in that: A sealing ring is also provided between the blocking portion and the neck.

7. The anti-reuse pressure container according to claim 2, characterized in that: The neck is a column with a cross section that is the same as the cross section of the shrinkage hole portion, and a venting groove extending along the axial direction of the one-way plug is provided on the cylindrical surface of the neck.

8. The anti-reuse pressure container according to claim 2, characterized in that: The side of the blocking protrusion facing the head is conical, and the side of the blocking protrusion facing the neck is flat.

9. The anti-reuse pressure container according to claim 8, characterized in that: The blocking protrusion is made of elastic material.

10. The anti-reuse pressure container according to claim 7, characterized in that: The cross section of the ventilation groove is arc-shaped.

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