Semi-automatic oxygen cylinder

Abstract

The utility model relates to the field of oxygen cylinder, concretely relates to a kind of semi-automatic oxygen cylinder, including bottle body, outer cover, pressure maintaining assembly and deflation button;Deflation button is inserted on the outlet tube of bottle body, and first installation slot is set up on bottle body, and pressure maintaining assembly includes inner cover and pressure maintaining rod, and the bottom end of inner cover is detachably connected on first installation slot, and pressure maintaining rod is set up on inner cover;Second installation slot is set up on bottle body, and the bottom end of outer cover is detachably connected on second installation slot;One end of deflation button is provided with the exhaust pipe that protrudes outward, and the top of outer cover is provided with assembly passage, and outer cover is detachably connected on bottle body, in use state, outer cover is separated from bottle body, and outer cover is connected with deflation button using assembly passage and exhaust pipe, realize that outer cover gives consideration to sealing and face shield function;Control pressure maintaining rod downlink to exert downward pressure on deflation button, realize the deflation drive of bottle body, realize the oxygen inhalation of labour-saving and high efficiency.

Description

Technical Field

[0001] This utility model relates to the field of oxygen cylinders, specifically to a semi-automatic oxygen cylinder. Background Technology

[0002] An oxygen cylinder is a specialized container for storing and transporting compressed oxygen. It is typically made of high-strength alloy steel or aluminum alloy, possessing properties that resist high pressure and corrosion to ensure safe use under extreme conditions. Its core function is to provide a stable gas source for people or situations requiring additional oxygen support, and it is widely used in medical emergency services, industrial operations, high-altitude travel, diving, and home oxygen therapy.

[0003] Portable oxygen cylinders are primarily used for activities at high altitudes, such as high-altitude travel. When the altitude exceeds 3000 meters, the oxygen content in the air drops sharply, and climbers may experience pulmonary edema or cerebral edema due to acute mountain sickness. Portable oxygen cylinders can alleviate symptoms through rapid oxygen inhalation. Push-button portable oxygen cylinders mainly consist of the cylinder body, a top button, an oxygen mask or nasal cannula, and safety features. Users press the top button to open the valve, allowing oxygen to flow out at a constant rate. The mask directs the oxygen flow, making it easy for the user to inhale.

[0004] However, existing portable oxygen cylinders require continuous pressing by the user's hand to release gas continuously. But when the user is in a hypoxic state, the pressing pressure cannot be maintained, and there is a risk that the gas cannot be released. At the same time, as the pressing time increases, the user's physical strength is continuously consumed, and the pressing pressure is prone to change, resulting in a decrease in gas release efficiency. Utility Model Content

[0005] The purpose of this invention is to provide a semi-automatic oxygen cylinder, which aims to improve the existing portable oxygen cylinders that require continuous pressing by the user's hand to release oxygen continuously. As the user's physical strength is depleted, the pressing pressure can easily change, leading to a decrease in the release efficiency.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A semi-automatic oxygen cylinder includes a cylinder body, an outer cap, a pressure-holding component, and a release button; The venting button is inserted into the vent pipe of the bottle body. The bottle body has a first mounting groove, which surrounds the vent pipe. The pressure holding assembly includes an inner cover and a pressure holding rod. The bottom end of the inner cover is detachably connected to the first mounting groove. The pressure holding rod is raised and lowered on the inner cover. The venting button is located at the bottom end of the pressure holding rod and is located on the movement path of the pressure holding rod. The bottle body has a second mounting groove, and the bottom end of the outer cover is detachably connected to the second mounting groove; one end of the vent button has an outwardly protruding vent pipe, the free end of the vent pipe protrudes from the inner cover, and the top of the outer cover has an assembly channel, the diameter of which matches the outer diameter of the vent pipe.

[0007] Furthermore, the inner cover includes an annular curved surface body, and the bottom end of the annular curved surface body is provided with a first locking block, which is engaged with the first mounting groove. The top of the annular curved surface body is provided with a mounting plate, and the pressure holding rod is lifted and lowered on the mounting plate; One side of the annular curved surface body is provided with a clearance notch, and the end of the exhaust pipe passes through the clearance notch and extends outward.

[0008] Furthermore, the opening end face of the clearance notch is located on the side of the exhaust pipe, and the top width of the outer cover is greater than the opening width of the clearance notch.

[0009] Furthermore, the top of the pressure holding rod is provided with a rotating grip plate, the diameter of which is larger than the diameter of the pressure holding rod; The pressure-holding rod has external threads on its periphery, and the mounting plate has a mounting channel. The top opening of the mounting channel has a mounting protrusion ring, and both the mounting protrusion ring and the mounting channel have internal threads. The pressure-holding rod is connected to the mounting channel and the mounting protrusion ring through the external and internal threads.

[0010] Furthermore, the annular curved surface body has an elastic notch, the bottom end of the elastic notch penetrates the first locking block, the top end of the elastic notch extends toward the mounting plate and is spaced apart from the mounting plate.

[0011] Furthermore, the bottom end of the pressure holding rod is provided with an arc-shaped top abutment surface, and the top surface of the venting button is provided with an arc-shaped top abutment groove. The arc-shaped top abutment groove and the arc-shaped top abutment surface are located in the same vertical extension direction, and the curvature of the bottom of the arc-shaped top abutment groove is greater than or equal to the curvature of the arc-shaped top abutment surface.

[0012] Furthermore, the outer cover includes an end body and a first stepped annular portion, a second stepped annular portion, and a third stepped annular portion connected sequentially to one side of the end body, wherein the dimensions of the first stepped annular portion, the second stepped annular portion, and the third stepped annular portion increase sequentially. The assembly channel is opened on the end body; the inner ring surface of the first step annular portion corresponds to the top position of the pressure holding rod and is spaced apart from the top position of the pressure holding rod; the second step annular portion corresponds to the top position of the bottle body and is spaced apart from the exhaust pipe; the inner ring surface of the third step annular portion is encircled on the outer side of the bottle body and is detachably connected to the second mounting groove.

[0013] Furthermore, the inner annular surface of the third step is provided with a second locking block, which engages with the second mounting groove.

[0014] By adopting the above technical solution, this utility model has the following advantages compared with the prior art: The outer cap is detachably connected to the bottle body. In use, the outer cap is separated from the bottle body. The outer cap is connected to the release button via the assembly channel and vent pipe, so that the outer cap can serve as both a seal and a mask. The release button is located at the bottom of the pressure holding rod and is on the movement path of the pressure holding rod. Controlling the downward movement of the pressure holding rod applies downward pressure to the release button, thereby driving the release of air from the bottle body. The pressure holding rod replaces the hand in applying a continuous force to the release button, so as to achieve continuous release of air from the bottle body and avoid changes in the pressing force, which would affect the release efficiency and achieve labor-saving and high-efficiency oxygen inhalation. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the storage state structure of the semi-automatic oxygen cylinder described in this utility model; Figure 2 This is a cross-sectional structural diagram of the semi-automatic oxygen cylinder of the present invention in its storage state. Figure 3 This is a schematic diagram of the semi-automatic oxygen cylinder of this utility model in use. Figure 4 This is a cross-sectional structural diagram of the semi-automatic oxygen cylinder of this utility model in use. Figure 5 This is a schematic diagram of the inner cap structure of the semi-automatic oxygen cylinder described in this utility model; Figure 6 This is a schematic diagram of the venting button structure of the semi-automatic oxygen cylinder described in this utility model; Figure 7 This is a partial cross-sectional structural diagram of the semi-automatic oxygen cylinder described in this utility model.

[0016] Explanation of reference numerals in the attached figures: 1. Bottle body; 11. Gas outlet pipe; 12. First mounting slot; 13. Second mounting slot; 2. Outer cover; 21. End body; 211. Assembly channel; 22. First step annular portion; 23. Second step annular portion; 24. Third step annular portion; 3. Pressure holding assembly; 31. Inner cover; 311. Annular curved body; 3111. Elastic notch; 3112. Limiting protrusion; 312. First locking block; 313. Mounting plate; 3131. Mounting channel; 3132. Mounting protrusion ring; 3133. Internal thread; 314. Clearance notch; 32. Pressure holding rod; 321. Rotating grip plate; 322. External thread; 323. Rounded top abutment surface; 4. Vent button; 41. Exhaust pipe; 42. Rounded top groove; 43. Limiting groove. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0018] Additionally, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are all based on the orientation or positional relationship shown in the accompanying drawings. They are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element of this utility model must have a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] When an element is referred to as being "fixed to," "set on," or "contained on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to," it can be directly connected to or indirectly connected to that other element.

[0020] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Example

[0021] Please refer to Figure 1-7As shown, this embodiment provides a semi-automatic oxygen cylinder, including a cylinder body 1, an outer cap 2, a pressure-holding assembly 3, and a release button 4. The release button 4 is inserted into the outlet pipe 11 of the cylinder body 1. The cylinder body 1 has a first mounting groove 12, which surrounds the outlet pipe 11. The pressure-holding assembly 3 includes an inner cap 31 and a pressure-holding rod 32. The bottom end of the inner cap 31 is detachably connected to the first mounting groove 12. The pressure-holding rod 32 is flexibly mounted on the inner cap 31. The release button 4 is located at the bottom end of the pressure-holding rod 32 and is located on the movement path of the pressure-holding rod 32. The cylinder body 1 has a second mounting groove 13, and the bottom end of the outer cap 2 is detachably connected to the second mounting groove 13. One end of the release button 4 has an outwardly protruding exhaust pipe 41. The free end of the exhaust pipe 41 protrudes from the inner cap 31. The top end of the outer cap 2 has an assembly channel 211, the diameter of which matches the outer diameter of the exhaust pipe 41.

[0022] The outer cover 2 is detachably connected to the bottle body 1. In use, the outer cover 2 is separated from the bottle body 1. The outer cover 2 is connected to the venting button 4 via the assembly channel 211 and the exhaust pipe 41, so that the outer cover 2 can serve as both a seal and a mask. The venting button 4 is located at the bottom of the pressure holding rod 32 and is located on the movement path of the pressure holding rod 32. Controlling the pressure holding rod 32 to move downward applies downward pressure to the venting button 4, thereby driving the venting of the bottle body 1. The pressure holding rod 32 replaces the hand to apply a continuous force to the venting button 4, so as to achieve continuous venting of the bottle body 1 and avoid changes in the pressing force, which would affect the venting efficiency and achieve labor-saving and high-efficiency oxygen inhalation.

[0023] Please refer to Figure 3 and Figure 5 As shown, the inner cover 31 includes an annular curved body 311. A first locking block 312 is provided at the bottom end of the annular curved body 311, and the first locking block 312 engages with the first mounting groove 12. A mounting plate 313 is provided at the top end of the annular curved body 311, and a pressure-holding rod 32 is flexibly mounted on the mounting plate 313. A clearance notch 314 is provided on one side of the annular curved body 311, and the end of the exhaust pipe 41 passes through the clearance notch 314 and extends outward.

[0024] The inner cover 31 is detachably connected to the bottle body 1 via the first locking block 312, enabling quick assembly and disassembly of the inner cover 31 and the bottle body 1. This facilitates the maintenance or replacement of the pressure-holding component 3 on the semi-automatic oxygen cylinder. The mounting plate 313 supports the pressure-holding rod 32, providing support and ensuring continuous contact between the pressure-holding rod 32 and the vent button 4 when pressed down. The clearance notch 314 allows space for the exhaust pipe 41, ensuring that the exhaust pipe 41 can extend outward and connect to the outer cover 2. Furthermore, the curvature of the annular curved body 311 is equal to that of the first mounting groove 12, lacking only the clearance notch 314, thus retaining a larger circumference and providing a longer installation space for the first locking block 312. This improves the stability of the inner cover 31 installation and effectively enhances the overall structural strength of the inner cover 31, ensuring that the mounting plate 313 can provide stable support for the pressure-holding rod 32, thereby improving the pressure-holding effect.

[0025] Please refer to Figure 3-5 As shown, the opening end face of the clearance notch 314 is located on the side of the exhaust pipe 41, and the top width of the outer cover 2 is greater than the opening width of the clearance notch 314. That is, the opening end face of the clearance notch 314 is located on the connection path when the outer cover 2 is inserted into the exhaust pipe 41. When the outer cover 2 is assembled, the exhaust pipe 41 is inserted into the assembly channel 211 to the maximum extent. Since the top width of the outer cover 2 is greater than the opening width of the clearance notch 314, it ensures that the opening end face of the clearance notch 314 and the end face of the outer cover 2 abut against each other, thereby supporting the outer cover 2 and improving the stability of the outer cover 2 in use, ensuring a stable oxygen supply to the user.

[0026] Please refer to Figure 2-4As shown, the top of the pressure holding rod 32 is provided with a rotating grip plate 321, the diameter of which is larger than the diameter of the pressure holding rod 32. External threads 322 are formed on the circumference of the pressure holding rod 32; an installation channel 3131 is formed on the mounting plate 313, the top opening of which is provided with an installation protrusion ring 3132, and internal threads 3133 are formed in both the installation protrusion ring 3132 and the installation channel 3131; the pressure holding rod 32 is connected to the installation channel 3131 and the installation protrusion ring 3132 via the external threads 322 and the internal threads 3133. The rotating grip plate 321 has a large diameter, providing a gripping structure for the hand, facilitating the application of rotational driving force to the pressure holding rod 32 and controlling its raising and lowering. The pressure holding rod 32 is connected to the mounting plate 313 via threads. The friction between the internal thread 3133 and the external thread 322 ensures the stability of the pressure holding rod 32 at a horizontal height, thereby allowing it to apply downward driving force to the release button 4. Furthermore, the outwardly protruding mounting ring 3132 provides circumferential limiting force to the pressure holding rod 32, ensuring its vertical rotation and raising / lowering, and improving the accuracy of its movement path. Increasing the length of the internal thread 3133 also increases the contact area between the pressure holding rod 32 and the mounting plate 313, further enhancing the stability of the pressure holding rod 32 at a horizontal height.

[0027] In this embodiment, the first locking block 312 is a silicone first locking block 312, which makes the first locking block 312 and the bottle body 1 have a large friction force. During the process of driving the pressure holding rod 32 downward to press the venting button 4, or during the process of driving the pressure holding rod 32 upward to reset, it ensures that the inner cover 31 remains stable and prevents the inner cover 31 from rotating with the pressure holding rod 32, which would affect the driving effect of the pressure holding rod 32.

[0028] Please refer to Figure 3 and Figure 5As shown, an elastic notch 3111 is provided on the annular curved body 311. The bottom end of the elastic notch 3111 passes through the first locking block 312, and the top end of the elastic notch 3111 extends towards the mounting plate 313, with a gap between it and the mounting plate 313. The bottom end of the elastic notch 3111 passing through the first locking block 312 reduces the structural strength of the bottom end of the annular curved body 311 to a certain extent, making it easier for the bottom end of the annular curved body 311 to be bent within a certain range and to recover using its own hardness, facilitating the installation of the inner cover 31, thereby improving the efficiency of the pressure holding assembly 3. The gap between the top end of the elastic notch 3111 and the mounting plate 313 reduces the damage of the elastic notch 3111 to the structural strength of the top of the inner cover 31, ensuring that the mounting plate 313 provides a stable limiting force for the pressure holding rod 32. Specifically, the elastic notch 3111 is located on both sides of the relief notch 314, that is, the elastic notch 3111 is set close to the relief notch 314, and the elastic notch 3111 reduces the structural strength of the annular curved body 311 at the end face of the relief notch 314.

[0029] During the assembly of the inner cap 31, the inner cap 31 is located on the side of the bottle body 1, and one side of the clearance notch 314 of the inner cap 31 moves towards the bottle body 1. When the end face of the clearance notch 314 abuts against the bottle body 1, the first locking block 312 enters the first mounting groove 12, and the outer side of the bottle body 1 applies an outward pushing force to the end face of the annular curved body 311 located at the clearance notch 314, causing the annular curved body 311 to open to both sides at the end face of the clearance notch 314. After the two end faces of the clearance notch 314 pass the two ends of the diameter of the bottle body 1, the pushing force applied by the bottle body 1 to the bottom of the annular curved body 311 decreases, and the annular curved body 311 at the end face of the clearance notch 314 recovers under its own elastic force and clamps the bottle body 1, thus realizing the installation between the inner cap 31 and the bottle body 1. During the disassembly of the inner cap 31, a force is applied to the inner cap 31 in a direction away from the clearance notch 314, causing the clearance notch 314 of the inner cap 31 to translate through the top of the bottle body 1, thereby achieving the separation between the inner cap 31 and the bottle body 1.

[0030] The pressure holding rod 32 has a circular arc-shaped top abutment surface 323 at its bottom end, and a circular arc-shaped top abutment groove 42 is formed on the top surface of the release button 4. The circular arc-shaped top abutment groove 42 and the circular arc-shaped top abutment surface 323 are located in the same vertical extension direction, and the curvature of the bottom of the circular arc-shaped top abutment groove 42 is greater than or equal to the curvature of the circular arc-shaped top abutment surface 323. In this embodiment, the curvature of the bottom of the circular arc-shaped top abutment groove 42 is greater than the curvature of the circular arc-shaped top abutment surface 323, thereby forming a larger abutment space and ensuring that the circular arc-shaped top abutment surface 323 at the bottom end of the pressure holding rod 32 can accurately abut against the circular arc-shaped top abutment groove 42. Furthermore, the arc-shaped top groove 42 and the arc-shaped top surface 323 are positioned in the same vertical extension direction. Even if the pressure-holding rod 32 tilts, the arc-shaped bottom groove with its curved bottom surface can be used to correct the position of the arc-shaped top surface 323 at the bottom of the pressure-holding rod 32, ensuring that the downward pressure applied by the pressure-holding rod 32 is in the same extension direction as the gas outlet pipe 11 of the bottle body 1, thereby improving the gas outlet efficiency. Similarly, the curvature of the bottom of the arc-shaped top groove 42 can also be equal to the curvature of the arc-shaped top surface 323.

[0031] Please refer to Figure 2 , Figures 4-7 As shown, a limiting protrusion 3112 is provided on the inner surface of the annular curved body 311. The limiting protrusion 3112 extends toward the clearance notch 314 and is located on the central axis of the clearance notch 314. A limiting groove 43 is provided on the vent button 4. The limiting groove 43 and the exhaust pipe 41 are located on both sides of the vent button 4, respectively. Please refer to... Figure 7 As shown, the end of the limiting protrusion 3112 is embedded in the limiting groove 43. The limiting protrusion 3112, embedded in the limiting groove 43, internally limits the vent button 4, ensuring that the vent button 4 can only rotate synchronously with the inner cover 31. This prevents the vent button 4 from rotating independently and shifting its position relative to the inner cover 31, thus affecting the installation and use of the outer cover 2. Simultaneously, the limiting protrusion 3112 extends towards the clearance notch 314 and is located on the central axis of the clearance notch 314. The limiting groove 43 and the exhaust pipe 41 are located on opposite sides of the vent button 4, ensuring that the exhaust pipe 41 always remains on the central axis of the clearance notch 314. Therefore, during the assembly of the outer cover 2, the planes of the opening ends of the clearance notch 314 are parallel to the end face of the outer cover 2. This ensures that when the outer cover 2 is assembled, the opening ends of the clearance notch 314 simultaneously maintain abutting contact with the end face of the outer cover 2, providing uniform support for the outer cover 2.

[0032] Please refer to Figure 1-4As shown, the outer cover 2 includes an end body 21 and a first stepped annular portion 22, a second stepped annular portion 23, and a third stepped annular portion 24 sequentially connected to one side of the end body 21. The dimensions of the first stepped annular portion 22, the second stepped annular portion 23, and the third stepped annular portion 24 increase sequentially. An assembly channel 211 is formed on the end body 21. The inner ring surface of the first stepped annular portion 22 corresponds to the top end of the pressure holding rod 32 and is spaced apart from the top end of the pressure holding rod 32; the second stepped annular portion 23 corresponds to the top end of the bottle body 1 and is spaced apart from the exhaust pipe 41; the inner ring surface of the third stepped annular portion 24 surrounds the outer surface of the bottle body 1 and is detachably connected to the second mounting groove 13. By sequentially increasing the dimensions of the first stepped annular portion 22, the second stepped annular portion 23, and the third stepped annular portion 24, a trumpet-shaped outer cover 2 is formed, which facilitates the guidance of oxygen flow during use. Furthermore, the first step annular portion 22 and the second step annular portion 23 respectively make way for the pressure holding rod 32 and the exhaust pipe 41, facilitating the connection between the outer cover 2 and the oxygen cylinder during storage.

[0033] The inner ring surface of the third step annular portion 24 is provided with a second locking block (not shown in the attached figure), which engages with the second mounting groove 13. By engaging the second mounting groove 13 with the second locking block, the disassembly and connection between the outer cover 2 and the bottle body 1 are realized, improving the efficiency of disassembly and assembly of the outer cover 2 and the efficiency of switching between the use state and storage state of the semi-automatic oxygen cylinder.

[0034] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A semi-automatic oxygen cylinder, characterized in that, Includes the bottle body, outer cap, pressure-holding components, and venting button; The venting button is inserted into the vent pipe of the bottle body. The bottle body has a first mounting groove, which surrounds the vent pipe. The pressure holding assembly includes an inner cover and a pressure holding rod. The bottom end of the inner cover is detachably connected to the first mounting groove. The pressure holding rod is raised and lowered on the inner cover. The venting button is located at the bottom end of the pressure holding rod and is located on the movement path of the pressure holding rod. The bottle body has a second mounting groove, and the bottom end of the outer cover is detachably connected to the second mounting groove; one end of the vent button has an outwardly protruding vent pipe, the free end of the vent pipe protrudes from the inner cover, and the top of the outer cover has an assembly channel, the diameter of which matches the outer diameter of the vent pipe.

2. The semi-automatic oxygen cylinder according to claim 1, characterized in that: The inner cover includes an annular curved body, the bottom end of which is provided with a first locking block, which is engaged with a first mounting groove; the top end of which is provided with a mounting plate, and the pressure holding rod is lifted and lowered on the mounting plate; one side of the annular curved body is provided with a clearance notch, and the end of the exhaust pipe passes through the clearance notch and extends outward.

3. The semi-automatic oxygen cylinder according to claim 2, characterized in that: The opening end face of the clearance notch is located on the side of the exhaust pipe, and the top width of the outer cover is greater than the opening width of the clearance notch.

4. The semi-automatic oxygen cylinder according to claim 2, characterized in that: The top of the pressure holding rod is provided with a rotating grip plate, the diameter of which is larger than the diameter of the pressure holding rod; The pressure-holding rod has external threads on its periphery, and the mounting plate has a mounting channel. The top opening of the mounting channel has a mounting protrusion ring, and both the mounting protrusion ring and the mounting channel have internal threads. The pressure-holding rod is connected to the mounting channel and the mounting protrusion ring through the external and internal threads.

5. The semi-automatic oxygen cylinder according to claim 2, characterized in that: An elastic notch is provided on the annular curved surface body. The bottom end of the elastic notch passes through the first locking block, and the top end of the elastic notch extends toward the mounting plate and is spaced apart from the mounting plate.

6. The semi-automatic oxygen cylinder according to claim 1, characterized in that: The pressure holding rod has a circular arc top abutment surface at its bottom end, and the venting button has a circular arc top abutment groove on its top surface. The circular arc top abutment groove and the circular arc top abutment surface are located in the same vertical extension direction, and the curvature of the bottom of the circular arc top abutment groove is greater than or equal to the curvature of the circular arc top abutment surface.

7. The semi-automatic oxygen cylinder according to claim 1, characterized in that: The outer cover includes an end body and a first stepped annular portion, a second stepped annular portion, and a third stepped annular portion connected sequentially to one side of the end body, wherein the dimensions of the first stepped annular portion, the second stepped annular portion, and the third stepped annular portion increase sequentially. The assembly channel is opened on the end body; the inner ring surface of the first step annular portion corresponds to the top position of the pressure holding rod and is spaced apart from the top position of the pressure holding rod; the second step annular portion corresponds to the top position of the bottle body and is spaced apart from the exhaust pipe; the inner ring surface of the third step annular portion is encircled on the outer side of the bottle body and is detachably connected to the second mounting groove.

8. The semi-automatic oxygen cylinder according to claim 7, characterized in that: The inner ring surface of the third step annular portion is provided with a second locking block, which engages with the second mounting groove.

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