A leak-proof flow shut-off safety device
By adopting a double sealing ring design in the gas pressure regulator, the safety problem of gasket leakage is solved, ensuring that the device can still effectively seal when the sealing ring leaks, thus improving overall safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Filing Date
- 2025-09-01
- Publication Date
- 2026-07-14
AI Technical Summary
The gaskets of existing gas pressure regulators lack additional protection in case of gas leakage, which reduces the safety of the device.
The design employs two independent sealing rings, namely the first sealing ring and the second sealing ring. By setting a stepped surface and a through-hole structure, it is ensured that the other sealing ring can still play a limiting and sealing role when one sealing ring leaks air.
This improves the overall safety of the device in the event of leakage from the sealing ring, prevents the leakage from spreading, and enhances the safety of the device.
Smart Images
Figure CN224497594U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of pressure regulator technology, and more specifically, relates to an overcurrent cut-off safety device to prevent air leakage. Background Technology
[0002] During the use of gas, the pressure of the gas source, which has a certain pressure, needs to be reduced to the design-allowed pressure by a pressure regulator before ignition. For example, the overcurrent cut-off component on an intelligent shut-off pressure reducing valve disclosed in patent application number CN202421843812.8 (publication date June 3, 2025) uses a cut-off ball positioned at the junction of the first and second chambers to prevent communication between them, thus cutting off airflow and preventing overcurrent. Pressing down the handwheel contacts the valve with the cut-off ball, pushing it down and reconnecting the first and second chambers. This design is simple, convenient, and quick, improving safety during use.
[0003] However, this design only has one sealing gasket at the lower connection of the valve stem. When this sealing gasket leaks, there are no other protective measures to protect the safety of the device. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide an overcurrent cut-off safety device that prevents air leakage. By setting two independent sealing rings, the overall safety of the device can be improved.
[0005] This utility model discloses a leak-proof overcurrent cut-off safety device, which includes a pressure cap, a piston rod, and a protective sleeve. The top end of the piston rod is fixedly disposed inside the pressure cap, and the piston rod is slidably disposed inside the protective sleeve. The protective sleeve is disposed on the lower side of the pressure cap, and the pressure cap is sleeved on the upper outer side of the protective sleeve. It also includes a second sealing ring and a first sealing ring. The protective sleeve has a second stepped surface and a first stepped surface respectively, with the second stepped surface located above the first stepped surface. The second stepped surface faces upward, and the first stepped surface faces downward. The second sealing ring is disposed on the upper side of the second stepped surface, and the first sealing ring is disposed on the lower side of the first stepped surface.
[0006] As a further improvement of this utility model, the diameter of the second sealing ring is larger than that of the first sealing ring.
[0007] As a further improvement of this utility model, the protective sleeve is provided with a first through hole, a second through hole, and a third through hole in sequence from bottom to top; the first through hole, the second through hole, and the third through hole are interconnected; the first through hole is located below the second through hole, and the inner diameter of the first through hole is larger than the inner diameter of the second through hole, and the first through hole and the second through hole cooperate to form a first step surface facing downward; the second through hole is located below the third through hole, and the inner diameter of the second through hole is smaller than the inner diameter of the third through hole, and the second through hole and the third through hole cooperate to form a second step surface facing upward.
[0008] As a further improvement of this utility model, a tapered chamfer is provided at the lower end of the first through hole.
[0009] As a further improvement of this utility model, the piston rod includes a movable section and a limiting section arranged sequentially above and below, the movable section is located above the limiting section, and the outer diameter of the movable section is smaller than the outer diameter of the limiting section; the outer diameter of the limiting section is larger than the inner diameter of the second through hole; the limiting section of the piston rod is located inside the first through hole.
[0010] As a further improvement of this utility model, the first sealing ring is nested on the outside of the movable section of the piston rod, serving as a limit and seal; the second sealing ring is located on the upper side of the second step surface, and the lower side of the second sealing ring abuts against the top surface of the second through hole; the first sealing ring is set at the boundary between the movable section and the limiting section, the first sealing ring is located on the lower side of the first step surface, and the upper side of the first sealing ring abuts against the bottom surface of the first through hole.
[0011] As a further improvement of this utility model, a gasket and a spring are also provided on the upper side of the second sealing ring; the gasket is sleeved on the outside of the piston rod, and the outer side of the gasket abuts against the inner side wall of the third through hole; the spring is provided on the upper side of the gasket, the upper end of the spring abuts against the lower side wall inside the pressure cap, and the lower end of the spring abuts against the upper side of the gasket.
[0012] As a further improvement of this utility model, the gland and the piston rod are connected by a non-removable snap-fit structure.
[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0014] By setting a second sealing ring and a first sealing ring, if one of the sealing rings leaks, the other sealing ring can still play a role in limiting and sealing. By setting two independent sealing rings, the overall safety of the device can be improved. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0016] Figure 2 This is an exploded view of the present invention;
[0017] Figure 3 This is a schematic diagram of the structure of the protective cover of this utility model.
[0018] Explanation of the labels in the diagram:
[0019] 1. Pressure cap, 2. Piston rod, 3. Protective sleeve, 31. First through hole, 32. Second through hole, 33. Third through hole, 4. Spring, 5. Gasket, 6. Second sealing ring, 7. First sealing ring. Detailed Implementation
[0020] Specific Implementation Example 1: Please refer to Figures 1-3 An overcurrent cut-off safety device for preventing air leakage includes a pressure cap 1, a piston rod 2, a protective sleeve 3, a spring 4, a gasket 5, a second sealing ring 6, and a first sealing ring 7.
[0021] The top end of the piston rod 2 is fixedly installed inside the pressure cover 1. Preferably, the pressure cover 1 and the piston rod 2 are connected by a non-removable snap-fit structure, which makes the installation of the pressure cover 1 and the piston rod 2 convenient and prevents the user from accidentally loosening the pressure cover 1.
[0022] The protective sleeve 3 is located below the pressure cap 1, and the pressure cap 1 is fitted onto the outer side of the upper part of the protective sleeve 3. The inner wall of the pressure cap 1 is located on the outer side of the protective sleeve 3. The protective sleeve 3 has a first through hole 31, a second through hole 32, and a third through hole 33 sequentially formed from bottom to top; the first through hole 31, the second through hole 32, and the third through hole 33 are interconnected. The first through hole 31 is located below the second through hole 32, and the inner diameter of the first through hole 31 is larger than the inner diameter of the second through hole 32. The first through hole 31 and the second through hole 32 fit together to form a downward-facing first stepped surface. The second through hole 32 is located below the third through hole 33, and the inner diameter of the second through hole 32 is smaller than the inner diameter of the third through hole 33. The second through hole 32 and the third through hole 33 fit together to form an upward-facing second stepped surface. A tapered chamfer is formed at the lower end of the first through hole 31.
[0023] The piston rod 2 is slidably disposed inside the protective sleeve 3. The piston rod 2 includes a movable section and a limiting section arranged in sequence. The movable section is located above the limiting section, and the outer diameter of the movable section is smaller than the outer diameter of the limiting section. The outer diameter of the limiting section is larger than the inner diameter of the second through hole 32. The limiting section of the piston rod 2 is located inside the first through hole 31.
[0024] The first sealing ring 7 is nested on the outside of the movable section of the piston rod 2, serving to limit and seal. The second sealing ring 6 is located on the upper side of the second step surface, and its lower side abuts against the top surface of the second through hole 32 (i.e., the bottom surface of the third through hole 33). The first sealing ring 7 is located at the boundary between the movable section and the limiting section, on the lower side of the first step surface, and its upper side abuts against the bottom surface of the first through hole 31. Preferably, the diameter of the second sealing ring 6 is larger than that of the first sealing ring 7, and the sealing performance of the second sealing ring 6 is superior to that of the first sealing ring 7; the sealing ring material is a conventional sealing ring material.
[0025] A gasket 5 and a spring 4 are also provided on the upper side of the second sealing ring 6. The gasket 5 is sleeved on the outside of the piston rod 2, and the outer side of the gasket 5 abuts against the inner sidewall of the third through hole 33. The spring 4 is provided on the upper side of the gasket 5, and the upper end of the spring 4 abuts against the lower sidewall inside the pressure cap 1, while the lower end of the spring 4 abuts against the upper side of the gasket 5.
[0026] Working principle:
[0027] The operator presses down on the pressure cap 1 with their hand, and the pressure cap 1 moves the piston rod 2 downward, compressing the spring 4; if the first sealing ring 7 leaks, the second sealing ring 6 still blocks the airflow between the second through hole 32 and the third through hole 33; this can prevent the entire device from leaking and improve the overall safety of the device.
Claims
1. A leak-proof overcurrent cut-off safety device, comprising a pressure cap (1), a piston rod (2), and a protective sleeve (3); the top end of the piston rod (2) is fixedly disposed inside the pressure cap (1), and the piston rod (2) is slidably disposed inside the protective sleeve (3); the protective sleeve (3) is disposed on the lower side of the pressure cap (1), and the pressure cap (1) is sleeved on the outer side of the upper part of the protective sleeve (3); characterized in that: It includes a second sealing ring (6) and a first sealing ring (7); the protective sleeve (3) has a second step surface and a first step surface respectively inside, the second step surface is located on the upper side of the first step surface; the second step surface faces upward and the first step surface faces downward; the second sealing ring (6) is located on the upper side of the second step surface and the first sealing ring (7) is located on the lower side of the first step surface.
2. The overcurrent cut-off safety device for preventing air leakage according to claim 1, characterized in that: The diameter of the second sealing ring (6) is larger than that of the first sealing ring (7).
3. The overcurrent cut-off safety device for preventing air leakage according to claim 1, characterized in that: The protective sleeve (3) is provided with a first through hole (31), a second through hole (32), and a third through hole (33) in sequence from bottom to top; the first through hole (31), the second through hole (32), and the third through hole (33) are interconnected; the first through hole (31) is located below the second through hole (32), the inner diameter of the first through hole (31) is larger than the inner diameter of the second through hole (32), and the first through hole (31) and the second through hole (32) cooperate to form a first step surface facing downward; the second through hole (32) is located below the third through hole (33), the inner diameter of the second through hole (32) is smaller than the inner diameter of the third through hole (33), and the second through hole (32) and the third through hole (33) cooperate to form a second step surface facing upward.
4. The overcurrent cut-off safety device for preventing air leakage according to claim 3, characterized in that: A tapered chamfer is provided at the lower end of the first through hole (31).
5. The overcurrent cut-off safety device for preventing air leakage according to claim 3, characterized in that: The piston rod (2) includes a movable section and a limiting section arranged in sequence. The movable section is located above the limiting section, and the outer diameter of the movable section is smaller than the outer diameter of the limiting section. The outer diameter of the limiting section is larger than the inner diameter of the second through hole (32). The limiting section of the piston rod (2) is located inside the first through hole (31).
6. The overcurrent cut-off safety device for preventing air leakage according to claim 5, characterized in that: The first sealing ring (7) is nested on the outside of the movable section of the piston rod (2) and serves to limit and seal; the second sealing ring (6) is located on the upper side of the second step surface, and the lower side of the second sealing ring (6) abuts against the top surface of the second through hole (32); the first sealing ring (7) is located at the boundary between the movable section and the limiting section, and the first sealing ring (7) is located on the lower side of the first step surface, and the upper side of the first sealing ring (7) abuts against the bottom surface of the first through hole (31).
7. The overcurrent cut-off safety device for preventing air leakage according to claim 1, characterized in that: The upper side of the second sealing ring (6) is also provided with a gasket (5) and a spring (4); the gasket (5) is sleeved on the outside of the piston rod (2), and the outer side of the gasket (5) abuts against the inner side wall of the third through hole (33); the spring (4) is provided on the upper side of the gasket (5), the upper end of the spring (4) abuts against the lower side wall inside the pressure cap (1), and the lower end of the spring (4) abuts against the upper side of the gasket (5).
8. The overcurrent cut-off safety device for preventing air leakage according to claim 1, characterized in that: The pressure cap (1) and the piston rod (2) are connected by a non-removable snap-fit structure.