Gas cylinder low-pressure cut-off device
By designing a low-pressure cutting device for gas cylinders, the gas pressure changes and ventilation pipeline structure are used to achieve automatic cutting when the gas source is low, solving the problem of standard gas exhaustion and ensuring the normal progress of gas cylinder cross-detection.
Patent Information
- Application Number
- CN202420032904.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-04
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-01-04
AI Technical Summary
The prior art cannot cut off the gas source in time when the gas source is low, resulting in the exhaustion of standard gas and the inability to conduct cross-checking of gas cylinders.
A low-pressure cutting device for gas cylinder is designed to achieve communication or partition between the gas supply side and the exhaust side by moving components. The gas source is automatically cut off by using the difference in the inner diameter of the gas diffusion port and the ventilation pipe by changing the gas pressure, and through The adjusting handle and positioning pin are manually adjusted.
It realizes the timely cut off the gas source when the gas source is low, avoiding standard gas exhaustion, and ensuring the smooth progress of the cross-checking of gas cylinders.
Smart Images
Figure CN222186615U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of automated instrument analyzer measurement, and specifically relates to a low-pressure cut-off device for a gas cylinder. Background Art
[0002] At the laboratory site, each gas analyzer is supplied with gas through a centralized gas cylinder. According to the gas cylinder usage specification, before replacing the gas cylinder used for analyzer calibration, the gas from the old and new gas cylinders must be passed into the analyzer to perform a cross-check on the gas concentration to prevent abnormal gas concentration in the new cylinder.
[0003] However, in actual use, the need for gas replacement can only be detected from the pressure gauge or the secondary pressure reducing valve after the gas in the old gas cylinder has been consumed. Even if a pressure detection alarm is used, it cannot prevent individual gas analyzers from continuing to use the standard gas, which can easily lead to the depletion of the standard gas and make cross-checking impossible.
[0004] The existing gas cylinder decompression device can set the upper limit of the output pressure, but it cannot prevent the continuous output of gas; or it can use a low-pressure gas cut-off valve to cut off the gas source when the outlet leaks and the pressure is low, but it cannot take action when the gas source is low-pressure, and it cannot continue to supply gas for cross detection when the pressure is low. That is, the existing technology cannot meet the existing application scenarios, such as when it is necessary to cut off the gas source in time when the gas source is low-pressure, and when calibration is required, the valve can be opened to continue to supply gas and implement gas cylinder cross detection. Utility Model Content
[0005] The present application provides a low-pressure cut-off device for a gas cylinder to solve the problem that the gas source cannot be cut off in time when the gas source pressure is low, and when calibration is required, the low pressure leads to inability to continuously supply gas and unable to implement gas cylinder cross detection.
[0006] The technical solution adopted in this application is:
[0007] A low-pressure cut-off device for a gas cylinder comprises a ventilation pipeline connected to the gas cylinder and a movable component at least partially located in the ventilation pipeline, wherein the ventilation pipeline is provided with a gas supply side and a gas outlet side, when the gas supply side is in a normal state, the movable component has a first position, when the gas supply side is in a low-pressure state, the movable component has a second position, when the movable component is in the first position, the gas supply side is connected to the gas outlet side, and when the movable component is in the second position, the gas supply side is isolated from the gas outlet side.
[0008] The low-pressure shut-off valve for the gas cylinder used in the standard gas pipeline described in this application specifically includes the following additional technical features:
[0009] The air supply side is provided with an air inlet, and the air outlet side is provided with an air outlet. The ventilation pipeline includes a first ventilation pipeline and a second ventilation pipeline. The inner diameter of the second ventilation pipeline is smaller than the inner diameter of the first ventilation pipeline. The air inlet and the air outlet are respectively located at the two ends of the first ventilation pipeline, and the air supply side is provided with a gas diffusion port connected to the second ventilation pipeline.
[0010] The moving assembly includes a first slider partially located in the first ventilation line and a second slider located in the second ventilation line. In the first position, the first slider abuts against the second slider, and in the second position, the first slider is separated from the second slider.
[0011] The first sliding block includes an avoidance section and a blocking section. In the first position, the avoidance section is at least partially located in the first ventilation pipeline. In the second position, the blocking section is partially located in the first ventilation pipeline.
[0012] The moving assembly further includes a first elastic return member abutting against the first sliding block and a second elastic return member abutting against the second sliding block.
[0013] The other end of the second elastic reset member is connected to an adjustment handle, and the outer wall of the second ventilation pipeline is provided with a pressure maintaining scale corresponding to the second elastic reset member.
[0014] The first elastic reset member abuts against the bottom of the first sliding block, and the second elastic reset member abuts against the side wall of the second sliding block.
[0015] The second ventilation pipeline includes a guide section connected to the gas diffusion port and a pressure stabilizing section connected to the guide section. The second ventilation pipeline is located on the top of the first ventilation pipeline, and the pressure stabilizing section is parallel to the first ventilation pipeline.
[0016] A positioning pin connected to the first sliding block is disposed outside the first ventilation pipeline, and the positioning pin is adjusted to enable the first sliding block to move vertically.
[0017] The gas diffusion port is located between the first slider and the gas inlet.
[0018] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:
[0019] (1) The change in the gas pressure on the gas supply side causes the position of the mobile component to change, thereby realizing the connection between the gas supply side and the gas outlet side or the isolation between the gas supply side and the gas outlet side, so as to cut off the gas source in time when the gas source pressure is low, thereby avoiding the situation where individual gas analyzers continue to use the standard gas when the gas source pressure is low, resulting in the exhaustion of the standard gas and the inability to perform cross-checking.
[0020] (2) By arranging the first slider and the second slider to be located in the first ventilation pipeline and the second ventilation pipeline respectively, when the gas source pressure is low, the gas entering the second ventilation pipeline from the gas diffusion port is reduced, and according to the law of molecular motion, the inner diameter of the second ventilation pipeline is small, and the gas will flow to the first ventilation pipeline, thereby causing the gas content in the second ventilation pipeline to decrease, and the gas pressure on the second slider is reduced, and the second slider moves toward the gas diffusion port. The first slider and the second slider reach the second position, and the first slider directly forms a barrier between the gas supply side and the gas outlet side, thereby realizing the gas source cut-off and preventing the gas from continuing to be output.
[0021] (3) The position of the first slider is manually adjusted by the positioning pin. The positioning pin pushes the first slider vertically downward and fixes it. At this time, the position of the first slider in the second position can still be achieved. The connection between the gas supply side and the gas outlet side is restored, and the first slider is in the second position to prevent excessive gas from flowing into the second ventilation pipeline, thereby implementing the cross-detection of gas cylinders.
[0022] (4) The pressure holding value is set by adjusting the compression degree of the second return spring according to the pressure holding scale and by adjusting the handle. BRIEF DESCRIPTION OF THE DRAWINGS
[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:
[0024] Figure 1 This is a structural schematic diagram of an embodiment of the utility model when the first slider and the second slider are located at the first position;
[0025] Figure 2 It is a structural schematic diagram of the first sliding block and the second sliding block in an embodiment of the utility model when they are located at the second position;
[0026] Figure 3 It is a structural schematic diagram of the first sliding block in one embodiment of the utility model.
[0027] Description of reference numerals:
[0028] 1. Air supply side; 2. Air inlet; 3. Air outlet side; 4. Air outlet; 5. Connecting thread; 6. First ventilation line; 7. First elastic reset member; 8. First slider; 9. Positioning pin; 10. Adjusting handle; 11. Second ventilation line; 12. Gas diffusion port; 13. Guide section; 14. Pressure stabilizing section; 15. Second slider; 16. Second elastic reset member; 17. Pressure maintaining scale; 18. Avoidance port; 19. Avoidance section; 20. Blocking section; 21. Inner recess; 22. Groove; 23. Through hole. DETAILED DESCRIPTION
[0029] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.
[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present application is not limited by the specific embodiments disclosed below. It should be noted that the embodiments of the present application and the features in each embodiment may be combined with each other without conflict.
[0031] In addition, in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.
[0032] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0033] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.
[0034] like Figure 1 , Figure 2As shown, the present application provides a low-pressure cut-off device for a gas cylinder, which is mainly used for standard gas pipelines, and includes a ventilation pipeline connected to the gas cylinder and a movable component at least partially located in the ventilation pipeline, the ventilation pipeline is provided with a gas supply side 1 and a gas outlet side 3, when the gas supply side 1 is in a normal state, the movable component has a first position, when the gas supply side 1 is in a low-pressure state, the movable component has a second position, when the movable component is in the first position, the gas supply side 1 is connected to the gas outlet side 3, and when the movable component is in the second position, the gas supply side 1 is separated from the gas outlet side 3.
[0035] The change in the air pressure on the air supply side 1 causes the position of the mobile component to change, thereby achieving connection between the air supply side 1 and the air outlet side 3 or isolation between the air supply side 1 and the air outlet side 3, so that the air source can be cut off in time when the air source pressure is low, avoiding that individual gas analyzers continue to use the standard gas when the air source pressure is low, resulting in the exhaustion of the standard gas, so that cross-check can be carried out smoothly.
[0036] Furthermore, the air supply side 1 is provided with an air inlet 2, and the air outlet side 3 is provided with an air outlet 4, the ventilation pipeline includes a first ventilation pipeline 6 and a second ventilation pipeline 11, the inner diameter of the second ventilation pipeline 11 is smaller than the inner diameter of the first ventilation pipeline 6, the air inlet 2 and the air outlet 4 are respectively located at the two ends of the first ventilation pipeline 6, and the air supply side 1 is provided with a gas diffusion port 12 connected to the second ventilation pipeline 11.
[0037] Furthermore, the moving assembly includes a first slider 8 partially located in the first ventilation duct 6 and a second slider 15 located in the second ventilation duct 11. In the first position, the first slider 8 abuts against the second slider 15, and in the second position, the first slider 8 is separated from the second slider 15.
[0038] It should be noted that part of the first slider 8 is located in the first ventilation duct 6, which is achieved by setting a fracture between the first ventilation ducts 6 for the first slider 8 to pass through, and in order to ensure the ventilation effect and air-breaking effect of the first ventilation duct 6, the distance between the two ends of the fracture is adapted to the outer diameter of the first slider 8, so that the first slider 8 can move in the vertical direction through the fracture.
[0039] Furthermore, the first sliding block 8 includes an avoidance section 19 and a blocking section 20 . In the first position, the avoidance section 19 is at least partially located in the first ventilation line 6 . In the second position, the blocking section 20 is partially located in the first ventilation line 6 .
[0040] In one embodiment, if Figure 3 As shown, a through hole 23 penetrating in the radial direction is provided on the first slider 8 to form an avoidance section, so that when the first slider 8 is in the first position, the air supply side 1 is connected with the air outlet side 3 through the through hole 23. It should be noted that the shape of the through hole 23 is not limited, and a circular, square or other shape can be selected.
[0041] like Figure 1 As shown, the second ventilation duct 11 is provided with a avoidance opening 18, so that the second slider 15 abuts against the first slider 8 through the avoidance opening 18, and the width of the first slider 8 is not less than the inner diameter of the avoidance opening 18, and the width of the second slider 15 is not greater than the inner diameter of the avoidance opening 18, so as to prevent the second ventilation duct 11 from being connected to the outside when the second slider 15 is removed.
[0042] By arranging the first slider 8 and the second slider 15 to be located in the first ventilation pipeline 6 and the second ventilation pipeline 11 respectively, when the gas source pressure is low, the gas entering the second ventilation pipeline 11 from the gas diffusion port 12 is reduced, and according to the law of molecular motion, the inner diameter of the second ventilation pipeline 11 is small, and the gas will flow to the first ventilation pipeline 6, thereby causing the gas content in the second ventilation pipeline 11 to decrease, and the gas pressure on the second slider 15 is reduced, and the second slider 15 moves toward the gas diffusion port 12. When the second slider 15 moves to separate from the first slider 8, the first slider 8 and the second slider 15 reach the second position, and the first slider 8 directly forms a barrier between the gas supply side 1 and the gas outlet side 3, thereby realizing the gas source cut-off and preventing the gas from continuing to be output.
[0043] In one embodiment, the moving assembly further includes a first elastic return member 7 abutting against the first sliding block 8 and a second elastic return member 16 abutting against the second sliding block 15 .
[0044] Furthermore, the other end of the second elastic reset member 16 is connected to an adjustment handle 10, and a pressure holding scale 17 is provided on the outer wall of the second ventilation pipeline 11 corresponding to the second elastic reset member 16. By adjusting the compression degree of the second elastic reset member 16 according to the pressure holding scale 17 and by adjusting the handle 10, the setting of the pressure holding value is achieved.
[0045] Furthermore, the first elastic return member 7 abuts against the bottom of the first sliding block 8 , and the second elastic return member 16 abuts against the side wall of the second sliding block 15 .
[0046] Specifically, both the first elastic return member 7 and the second elastic return member 16 are springs, and the elastic force of the second elastic return member 16 is set according to the total amount of gas required, so that when the second slider 15 moves to the first position, the elastic force of the second elastic return member 16 on the second slider 15 offsets the pressure of the gas on the second slider 15, thereby achieving that when the gas is sufficient, the first slider 8 and the second slider 15 are always in abutment state, ensuring the connectivity between the gas supply side 1 and the gas outlet side 3.
[0047] When the gas source pressure decreases, the pressure of the gas on the second slider 15 decreases, and the elastic force of the second elastic reset member 16 on the second slider 15 is greater than the pressure of the gas on the second slider 15. The second elastic reset member 16 stretches, pushing the second slider 15 to move in the direction of the gas diffusion port 12 until it moves to the second position. At this time, the second elastic reset member 16 reaches its maximum length, and the first slider 8 is completely separated from the second slider 15. The pressure from the second slider 15 on the top of the first slider 8 is canceled, the first slider 8 moves up, and the avoidance section 19 moves up to leave the first ventilation line 6. The blocking section 20 moves to between the air supply side 1 and the air outlet side 3 of the first ventilation line 6 as the first slider 8 moves up, and the air supply side 1 is separated from the air outlet side 3.
[0048] It should be noted that, by setting the extension and compression degree of the second elastic reset member 16, when the second slider 15 moves to the second position, the second elastic reset member 16 reaches the farthest extension state, at this time the first slider 8 moves upward, and the first slider 8 avoids the second elastic reset member 16. For details, please refer to the following embodiments:
[0049] Embodiment 1: Figure 2 As shown, the top of the first slider 8 is provided with an inner concave portion 21, which sets the maximum extension degree of the first elastic reset member 7. When the second slider 15 and the first slider 8 are in the second position, the elastic force of the first elastic reset member 7 makes the inner concave portion 21 of the first slider 8 just below the second elastic reset member 16, and the depth of the inner concave portion 21 is set according to the length of the first slider 8 entering the second ventilation pipeline 11 when reaching the second position. This method has a simple structure and low processing difficulty.
[0050] Embodiment 2: Figure 3 As shown, the top end of the first slider 8 is concave to form a groove 22. In the second position, the first slider 8 moves up to its top end and abuts against the inner wall of the second ventilation duct 11. At this time, the second elastic return member 16 passes through the groove 22. This arrangement makes the top end of the first slider 8 receive pressure from the inner wall of the second ventilation duct 11 when the first slider 8 is in the second position, and the bottom end is simultaneously subjected to the elastic force of the first elastic return member 7, which is beneficial to maintaining the stability of the first slider 8 in the second position.
[0051] It should be noted that the depth of the groove 22 is set according to the length of the first sliding block 8 entering the second ventilation pipeline 11 when reaching the second position.
[0052] In one embodiment, the second ventilation pipeline 11 includes a guide section 13 connected to the gas diffusion port 12 and a pressure stabilizing section 14 connected to the guide section 13 . The second ventilation pipeline 11 is located at the top of the first ventilation pipeline 6 , and the pressure stabilizing section 14 is parallel to the first ventilation pipeline 6 .
[0053] Preferably, the inner diameter of the guide section 13 is smaller than the pressure-stabilizing section 14, so that the gas enters the guide section 13 through the gas diffusion port 12 and then flows along the guide section 13 to the pressure-stabilizing section 14. The pressure-stabilizing section 14 is parallel to the first ventilation pipeline 6. A second slider 15 is arranged in the pressure-stabilizing section 14. The second slider 15 reaches the first position during the translation process and quickly abuts against the first slider 8. At this time, the elastic force of the second elastic return member 16 on the second slider 15 offsets the pressure of the gas on the second slider 15, so that the first slider 8 and the second slider 15 remain in the first position, thereby achieving a stable connection effect between the gas supply side 1 and the gas outlet side 3, and realizing rapid gas outlet.
[0054] In one embodiment, a positioning pin 9 connected to the first sliding block 8 is disposed outside the first ventilation pipeline 6 , and the positioning pin 9 is adjusted to enable the first sliding block 8 to move vertically.
[0055] The position of the first slider 8 is manually adjusted by the positioning pin 9, and the positioning pin 9 pushes the first slider 8 vertically downward and fixes it. At this time, the first slider 8 can still be in the first position. The connection between the gas supply side 1 and the gas outlet side 3 is restored, and the first slider 8 is in the first position to prevent excessive gas from flowing to the second ventilation pipeline 11, thereby implementing the cross-detection of gas cylinders.
[0056] In one embodiment, the gas diffusion port 12 is located between the first slider 8 and the gas inlet 2 .
[0057] The gas first reaches the gas diffusion port 12 from the gas supply side 1. When the gas is sufficient, the gas quickly gathers in the second ventilation pipeline 11, accelerating the movement of the second slider 15, thereby accelerating the second slider 15 and the first slider 8 to reach the first position, thereby realizing the connection between the gas supply side 1 and the gas outlet side 3.
[0058] It can be understood that the present device can be used as an intermediate structure in the gas circulation process. The two ends of the first ventilation pipeline 6, namely the gas supply side 1 and the gas outlet side 3, are connected to other pipelines or devices, and connecting wires 5 are arranged on the gas supply side 1 and the gas outlet side 3 to realize the connection between the gas supply side 1 and the gas outlet side 3 and other pipelines or devices.
[0059] The use process of the device of the present application is described as follows: the air inlet 2 of the air supply side 1 of the device is connected to the gas cylinder, and the air outlet 4 of the air outlet side 3 is connected to the secondary pressure reducing valve. When the air flow in the gas cylinder enters the first ventilation pipeline 6 and the second ventilation pipeline 11, the gas pressure is high, pushing the second slider 15 and compressing the second elastic reset member 16. At this time, the second slider 15 presses against the first slider 8 and reaches the first position. The first elastic reset member 7 is in a compressed state. The upper part of the first slider 8 is provided with an avoidance section 19, and the air flow in the first ventilation pipeline 6 can flow to the outlet side 3 through the avoidance section 19. As the gas in the gas cylinder is consumed, the pressure of the pressure stabilizing section 14 of the second ventilation pipeline 11 gradually decreases, and the second elastic reset member 16 pushes the second slider 15 to move to the left. When the pressure drops to the set value, the second slider 15 just leaves the first slider 8 and reaches the second position. At this time, the first slider 8 moves up under the action of the first elastic reset member 7, and the blocking section 20 rises to the first ventilation pipeline 6. The first ventilation pipeline 6 is cut off, and the gas cylinder stops supplying gas.
[0060] When the gas supply needs to be restored, the first slider 8 is pushed to the bottom and fixed by manually adjusting the positioning pin 9, and the gas cylinder can restore the gas supply. The compression degree of the first elastic reset member 7 is adjusted by adjusting the handle 10 and the pressure-maintaining scale 17, so as to achieve the purpose of setting the pressure-maintaining value.
[0061] It is understandable that the setting of the holding pressure value and the setting of the pressure value are selected according to the actual situation.
[0062] Anything not described in this application can be achieved by adopting or drawing on existing technologies.
[0063] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.
[0064] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims
1. A low-pressure cut-off device for a gas cylinder, characterized in that: The invention comprises a ventilation pipeline connected to a gas cylinder and a movable component at least partially located in the ventilation pipeline, wherein the ventilation pipeline is provided with a gas supply side (1) and a gas outlet side (3), when the gas supply side (1) is in a normal state, the movable component has a first position, when the gas supply side (1) is in a low pressure state, the movable component has a second position, when the movable component is in the first position, the gas supply side (1) is connected to the gas outlet side (3), and when the movable component is in the second position, the gas supply side (1) is isolated from the gas outlet side (3).
2. The low-pressure cut-off device for gas cylinders according to claim 1, characterized in that: The air supply side (1) is provided with an air inlet (2), the air outlet side (3) is provided with an air outlet (4), the ventilation pipeline comprises a first ventilation pipeline (6) and a second ventilation pipeline (11), the inner diameter of the second ventilation pipeline (11) is smaller than the inner diameter of the first ventilation pipeline (6), the air inlet (2) and the air outlet (4) are respectively located at two ends of the first ventilation pipeline (6), and the air supply side (1) is provided with a gas diffusion port (12) connected to the second ventilation pipeline (11).
3. The low-pressure cut-off device for gas cylinders according to claim 2, characterized in that: The moving assembly comprises a first slider (8) partially located in the first ventilation pipeline (6) and a second slider (15) located in the second ventilation pipeline (11); in the first position, the first slider (8) abuts against the second slider (15); in the second position, the first slider (8) is separated from the second slider (15).
4. The low-pressure cut-off device for gas cylinders according to claim 3, characterized in that: The first sliding block (8) comprises an avoidance section (19) and a blocking section (20); in the first position, the avoidance section (19) is at least partially located in the first ventilation pipeline (6); in the second position, the blocking section (20) is partially located in the first ventilation pipeline (6).
5. The low-pressure cut-off device for gas cylinders according to claim 3, characterized in that: The moving assembly further comprises a first elastic return member (7) abutting against the first sliding block (8) and a second elastic return member (16) abutting against the second sliding block (15).
6. The low-pressure cut-off device for gas cylinders according to claim 5, characterized in that: The other end of the second elastic reset member (16) is connected to an adjustment handle (10), and the outer wall of the second ventilation pipeline (11) is provided with a pressure-maintaining scale (17) corresponding to the second elastic reset member (16).
7. The low-pressure cut-off device for gas cylinders according to claim 5, characterized in that: The first elastic reset member (7) abuts against the bottom of the first sliding block (8), and the second elastic reset member (16) abuts against the side wall of the second sliding block (15).
8. The low-pressure cut-off device for gas cylinders according to claim 2, characterized in that: The second ventilation pipeline (11) comprises a guide section (13) connected to the gas diffusion port (12) and a pressure stabilizing section (14) connected to the guide section (13); the second ventilation pipeline (11) is located at the top of the first ventilation pipeline (6), and the pressure stabilizing section (14) is parallel to the first ventilation pipeline (6).
9. The low-pressure cut-off device for gas cylinders according to claim 3, characterized in that: A positioning pin (9) connected to the first sliding block (8) is provided outside the first ventilation pipeline (6), and the positioning pin (9) is adjusted to enable the first sliding block (8) to move vertically.
10. The low-pressure cut-off device for gas cylinders according to claim 3, characterized in that: The gas diffusion port (12) is located between the first slider (8) and the gas inlet (2).