Self-fusing pipeline flame arrester structure

Abstract

The self-fusing pipeline flame arrester structure comprises a shell with a cavity, the shell is provided with an input port and an output port which are communicated with the cavity, a flame-retardant sheet is arranged in the position, close to the output port, in the cavity, and a valve element corresponding to the input port is arranged in the shell in a sliding mode; the valve element is provided with a cavity, the cavity is provided with a first elastic piece forcing the valve element to move towards the input port, the cavity is provided with a fusing line, the fusing line is located between the valve element and the flame-retardant piece, and the fusing line limits the valve element to move towards the input port. When the temperature in the pipeline abnormally rises to the melting point of the fusing line, the fusing line is broken, the valve element blocks the input port, gas circulation is effectively blocked, and flame spreading is prevented. The whole process does not need manual intervention, response is rapid, reliability is high, and the use safety of gas equipment can be remarkably improved. And a flame propagation path is effectively blocked.

Description

Technical Field

[0001] This application relates to the field of flame arresters, and in particular to a self-fusing pipeline flame arrester structure. Background Technology

[0002] If the gas flow rate is lower than the combustion rate during use, or if the welding torch or cutting torch has exceeded its service life, backfire is likely to occur. After backfire, the flame can easily flow back into the gas cylinder along the gas pipe, thus posing an explosion risk.

[0003] Generally, welding torches or cutting torches are equipped with flame arrestors (sintered porous materials such as metal powder, porous ceramics, etc.). However, during the tempering process, the flame arrestor can only block the flame for 3-5 seconds. When the temperature of the flame arrestor is too high, the flame will pass through the gaps in the flame arrestor, causing the flame arrestor to lose its effectiveness. Ultimately, this will still lead to the risk of flame backflow and explosion. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a self-melting pipeline flame arrester structure that can achieve the flame arresting function through self-melting after tempering.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] A self-fusing pipeline flame arrester structure includes a housing with a cavity, an inlet and an outlet communicating with the cavity, a flame-retardant sheet disposed in the cavity near the outlet, a valve core corresponding to the inlet being slidably disposed in the housing, a first elastic element being disposed in the cavity to force the valve core to move toward the inlet, and a fusible wire being disposed in the cavity between the valve core and the flame-retardant sheet, the fusible wire restricting the movement of the valve core toward the inlet.

[0007] Preferably, a support body is slidably disposed within the cavity, the valve core is slidably disposed on the support body, a rotating rod is rotatably disposed on the support body, and the support body is provided with an anti-rotation member that restricts the rotation of the rotating rod relative to the support body.

[0008] Preferably, the cavity is further provided with a second elastic element, one end of which is connected to the support body and the other end of which is connected to the inner wall of the cavity.

[0009] Preferably, the support body has a receiving groove for accommodating the rotating rod.

[0010] Preferably, the rotating rod has a first limiting groove, the support body has a second limiting groove, and the end of the anti-rotation member passes through the first limiting groove and is located in the second limiting groove.

[0011] Preferably, there are two first limiting grooves, which are respectively opened at the two ends of the rotating rod, and there are two second limiting grooves, with each of the two second limiting grooves corresponding to one of the two first limiting grooves.

[0012] Preferably, the valve core has a valve head, and the valve head is provided with a sealing ring.

[0013] Preferably, the inlet has a flared opening, and the outer diameter of the sealing ring is larger than the diameter of the inlet and smaller than the diameter of the flared opening.

[0014] In summary, the present invention has the following beneficial technical effects:

[0015] When the temperature inside the pipeline abnormally rises to the melting point of the fusible link, the fusible link breaks, and the valve core, pushed by the first elastic element, blocks the inlet, effectively blocking gas flow and preventing flame spread. The entire process requires no manual intervention, is highly reliable, and significantly improves the safety of gas equipment. It also effectively blocks the flame propagation path. With its compact design and sensitive response, it is suitable for various gas pipeline systems and can achieve millisecond-level automatic sealing under abnormal high-temperature conditions, significantly reducing the risk of fire. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0017] Figure 2 This is a partial exploded structure diagram of the present invention. Figure 1 .

[0018] Figure 3 This is a partial exploded structure diagram of the present invention. Figure 2 .

[0019] Figure 4 This is a schematic cross-sectional view of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 1. Housing; 11. Upper section; 12. Middle section; 13. Lower section; 2. Cavity; 21. Inlet; 211. Flame flare; 22. Outlet; 3. Flame retardant sheet; 4. Valve core; 41. First elastic element; 42. Fusible wire; 43. Valve head; 44. Sealing ring; 5. Support body; 6. Rotating rod; 61. Anti-rotation element; 62. Second elastic element; 63. Receiving groove; 64. First limiting groove; 65. Second limiting groove. Detailed Implementation

[0021] The directional terms such as up, down, left, right, front, back, front, back, top, and bottom mentioned or possibly used in this specification are defined relative to the structures shown in the accompanying drawings. These are relative concepts and may therefore vary depending on their location and usage. Therefore, these or other directional terms should not be interpreted as restrictive. Furthermore, the terms "first," "second," "third," and similar expressions are used for descriptive and distinguishing purposes only and should not be construed as indicating or implying the relative importance of the corresponding components.

[0022] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 This application will be described in further detail.

[0023] This application discloses a self-fusing pipeline flame arrestor structure. The structure is installed on the pipeline between the welding torch or cutting torch and the gas cylinder. When the flame arrestor element in the welding torch or cutting torch fails, the flame flows back to the self-fusing pipeline flame arrestor structure, and the self-fusing pipeline flame arrestor structure is activated, thereby sealing the gas in the pipeline and preventing backfire.

[0024] Example 1:

[0025] A self-fusing pipeline flame arrester structure includes a housing 1 with a cavity 2. The housing 1 has an inlet 21 and an outlet 22 communicating with the cavity 2. The outlet 22 can be connected to a welding torch or a cutting torch. The inlet 21 is used to connect to a gas source, such as an acetylene cylinder, a propane tank, or a hydrogen-oxygen generator, to realize the transportation of combustible gas.

[0026] For ease of understanding of the accompanying drawings, the location of the outlet 22 of the housing 1 is defined as the upper part of the cavity 2, and the location of the inlet 21 of the housing 1 is defined as the lower part of the cavity 2. A flame-retardant sheet 3 is disposed above the cavity 2, near the outlet 22. The flame-retardant sheet 3 is fixedly connected to the side wall of the cavity 2. The flame-retardant sheet 3 is made of sintered metal or non-metal material with a porosity of 20-30 micrometers. This allows the gas to pass through the flame-retardant sheet 3 to mix with oxygen, and also blocks the flame to one side of the flame-retardant sheet 3 during backfire, thus achieving a flame-retardant effect.

[0027] A support body 5 is slidably disposed below the flame-retardant sheet 3. The support body 5 can slide along the axis of the cavity 2. The support body is hollow at its axis, and a valve core 4 is slidably disposed on the hollow axis, corresponding to the inlet 21. A first elastic element 41 is also disposed inside the cavity 2. The two ends of the first elastic element 41 are connected to the support body 5 and the valve core 4, respectively. The first elastic element 41 is a spring. When the spring is pre-compressed, it has the tendency to force the valve core 4 to move towards the inlet 21. A rotating rod 6 is rotatably disposed on the top of the support body 5. A receiving groove 63 is opened on the top of the support body 5. The receiving groove 63 is used to receive the rotating rod 6 and limit the rotating rod 6, so that the rotating rod 6 can only rotate along its own axis. A fusible wire 42 is also disposed inside the cavity 2. The fusible wire 42 is made of plastic wire or other low melting point material. The fusible wire 42 passes through the top of the valve core 4 and its two ends are connected to the rotating rod 6. As the lever 6 rotates, the fusible link 42 pulls the valve core 4 upward, maintaining a certain distance from the valve core 4 inlet 21 to ensure gas flow. At this time, under the tension of the fusible link 42, the first elastic element 41 remains under pressure. When backfire occurs, the high temperature causes the fusible link 42 to melt and break rapidly, the valve core 4 loses its constraint, and under the action of the first elastic element 41, the valve core 4 quickly moves downward, sealing the inlet 21. To ensure the flame arrester has a ventilation effect, cut edges or holes are provided on the support or valve core to facilitate air passage.

[0028] The cavity 2 is also equipped with a second elastic element 62, which is also a spring. One end of the second elastic element 62 is connected to the support body 5, and the other end is connected to the inner wall of the cavity 2. Since the support body 5 can slide up and down relative to the cavity 2, during the installation of the second elastic element 62, the setting of the second elastic element 62 can push the support body 5 to move upward until the fuse line 42 on the rotating rod 6 abuts against the bottom of the flame retardant plate 3. When backfire occurs, the flame retardant plate 3 is heated to a higher temperature, which can transfer the temperature to the fuse line 42, causing the fuse line 42 to melt rapidly due to the high temperature. After the fuse line 42 loses its tension, it no longer provides an upward pulling force to the valve core 4. At this time, the first elastic element 41 releases its stored energy, pushes the valve core 4 to move down quickly and tightly seals the inlet 21, cutting off the gas source passage.

[0029] The support body 5 has a receiving groove 63 for accommodating the rotating rod 6. The rotating rod 6 lies laterally in the receiving groove 63, which restricts the swing of the rotating rod 6, allowing it to rotate only around its own axis. The support body 5 is provided with an anti-rotation member 61 to restrict the rotation of the rotating rod 6 relative to the support body 5. The rotating rod 6 has a first limiting groove 64, and the support body 5 has a second limiting groove 65. The end of the anti-rotation member 61 passes through the first limiting groove 64 and is located in the second limiting groove 65. In this application, the anti-rotation member 61 is a cylindrical pin that passes through the first limiting groove 64 of the rotating rod 6 and is embedded in the second limiting groove 65 of the support body 5, achieving circumferential fixation between the rotating rod 6 and the support body 5. At this time, the fuse 42 is in a taut state. Furthermore, there are two first limiting grooves 64, respectively opened at the two ends of the rotating rod 6, and two second limiting grooves 65, with each of the two second limiting grooves 65 corresponding to one of the two first limiting grooves 64. The circumferential fixation of the rotating rod 6 can be achieved simply by having one anti-rotation element 61 pass through the corresponding first limiting groove 64 and second limiting groove 65. Furthermore, the two first limiting grooves 64 are symmetrically located at both ends of the rotating rod 6 and are staggered. This allows the rotating rod 6 to align one of the first limiting grooves 64 with the corresponding second limiting groove 65 by rotating only 90 degrees, facilitating the installation of the anti-rotation element 61. After the rotating rod 6 rotates to the point where the fuse 42 is tensioned, the anti-rotation element 61 restricts its rotation, ensuring that the fuse 42 always remains in a pre-tensioned state.

[0030] The valve core 4 has a valve head 43 facing the inlet 21, and a sealing ring 44 is provided on the valve head 43. The inlet 21 has a flared opening 211, and the outer diameter of the sealing ring 44 is larger than the diameter of the inlet 21 but smaller than the diameter of the flared opening 211. This allows the end face of the valve head 43 to form a sealing fit with the edge of the inlet 21. When the first elastic element 41 pushes the valve core 4 downward, the valve head 43 tightly presses against the inlet 21, achieving instantaneous cutoff of the gas path. The entire process requires no external energy intervention, is rapid in response and highly reliable, fully embodying the design essence of passive safety protection. The ingenious structural linkage allows the device to stably conduct gas under normal conditions, while decisively cutting off the gas path in the event of a hazard. The sealing ring 44 is made of high-temperature resistant fluororubber material, ensuring that it maintains good elasticity and sealing performance even under extreme temperatures.

[0031] The implementation principle of Example 1 is as follows: During the backfire, the flame will raise the temperature of the flame retardant sheet 3. Utilizing the characteristic of the fuse wire 42 to automatically melt at high temperature, the valve core 4 will quickly block the inlet 21 under the action of the spring, thereby achieving physical isolation of the airflow channel.

[0032] After the fuse breaks, the system responds entirely through mechanical means. The entire device operates stably without external power supply, making it suitable for high-risk gas transportation scenarios. By rationally configuring the spring preload and the 42 melting point of the fuse wire, it can precisely match different operating conditions, ensuring that the cut-off action is triggered immediately at the set temperature threshold, thereby improving the level of safety protection.

[0033] Before assembly, the housing 1 is divided into three sections: upper section 11, middle section 12, and lower section 13. The output port 22 is located in the upper section 11, and the input port 21 is located in the lower section 13. During assembly, the flame-retardant sheet 3 is first fixedly installed in the upper section 11. The fusible link 42 is tensioned by the rotating rod 6, which compresses the first elastic element 41. Then, the rotating rod 6 is fixed in place. The rotating rod 6, the support body 5, and the first elastic element 41 are integrated and installed into the middle section 12. Then, the second elastic element 62 is installed into the lower outlet of the middle section 12. Next, the upper end of the lower section 13 is also installed into the middle section 12 through the lower outlet of the middle section 12. The lower section 13 will push against the second elastic element 62, which in turn pushes the support body 5, keeping the fusible link 42 in contact with the flame-retardant sheet 3.

[0034] When the temperature inside the pipeline abnormally rises to the melting point of the fusible link 42, the fusible link 42 breaks. The valve core 4 slides along the support body 5 under the push of the first elastic element 41, and the valve head 43 drives the sealing ring 44 to embed into the flare 211, effectively blocking gas flow and preventing flame spread. The entire process requires no manual intervention, is highly responsive and reliable, and significantly improves the safety of gas equipment. Simultaneously, the second elastic element 62 provides a stable preload, ensuring that the valve core 4 is in a standby position when the fusible link 42 is intact, preventing malfunction. After the fusible link 42 melts, the first elastic element 41 releases its potential energy, pushing the valve core 4 to move rapidly. The sealing ring 44 is tightly pressed against the inner wall of the flare 211, forming a reliable seal and effectively blocking the flame propagation path. The compact design and sensitive response make it suitable for various gas pipeline systems. Under abnormal high-temperature conditions, it can achieve millisecond-level automatic sealing, significantly reducing the risk of fire.

[0035] Example 2:

[0036] The difference between this embodiment and Embodiment 1 lies in the connection structure of the fusible link 42. In this embodiment, the technical features of the support body 5, the rotating rod 6, the anti-rotation element 61, and the second elastic element 62 can be omitted, leaving only the valve core 4, the first elastic element 41, and the fusible link 42 inside the cavity 2. In this case, the fusible link 42 is connected to the flame-retardant sheet 3 and the valve core 4 respectively and remains taut, while the first elastic element 41 is compressed and remains stationary. When backfire occurs, the flame-retardant sheet 3 is heated and reaches the melting point of the fusible link 42, at which point it immediately breaks. The first elastic element 41 releases its compressive potential energy, pushing the valve core 4 to move axially along the cavity 2, causing the sealing ring 44 to fit tightly against the flared opening 211, achieving instantaneous closure of the gas passage. This structure eliminates the support body 5 and the rotating rod 6 mechanism, further simplifying the assembly process and reducing the failure rate. Because the fusible link 42 directly connects the valve core 4 and the flame-retardant sheet 3, the response is faster and the triggering action is more stable. The entire process is based on a purely mechanical response mechanism, requiring no external energy intervention, ensuring continuous and reliable operation in high-temperature, high-humidity, or strong-vibration environments. By adjusting the preload of the first elastic element 41 and the melting point of the fuse line 42, it can be adapted to different gas media and operating pressure requirements, improving the device's versatility and ease of maintenance while ensuring sealing performance.

[0037] Example 3:

[0038] The difference between this embodiment and Embodiments 1 and 2 is that the first elastic element can also be a tension spring. When the second elastic element is a tension spring, the second elastic element is disposed between the valve core and the lower section of the housing, so that the tension spring has the tendency to force the valve core into the inlet.

[0039] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, based on the technical solutions of this invention, those skilled in the art can propose various interchangeable structural methods and implementation methods without changing the essential spirit of this invention. Therefore, the above specific embodiments and accompanying drawings are merely illustrative descriptions of the technical solutions of this invention and should not be considered as the entirety of this invention or as a limitation or restriction of the technical solutions of this invention. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A self-fusing pipeline flame arrester structure, comprising a shell (1) having a cavity (2), the shell (1) having an inlet (21) and an outlet (22) communicating with the cavity (2), characterized in that: A flame-retardant sheet (3) is provided in the cavity (2) near the output port (22). A valve core (4) corresponding to the input port (21) is slidably provided in the housing (1). A first elastic element (41) is provided in the cavity (2) to force the valve core (4) to move towards the input port (21). A fusible wire (42) is provided in the cavity (2). The fusible wire (42) is located between the valve core (4) and the flame-retardant sheet (3). The fusible wire (42) restricts the valve core (4) from moving towards the input port (21).

2. The structure of a self-fusing pipeline flame arrester as described in claim 1, characterized in that: A support body (5) is slidably disposed inside the cavity (2), the valve core (4) is slidably disposed on the support body (5), a rotating rod (6) is rotatably disposed on the support body (5), and the support body (5) is provided with an anti-rotation member (61) that restricts the rotation of the rotating rod (6) relative to the support body (5).

3. The structure of a self-fusing pipeline flame arrester as described in claim 2, characterized in that: The cavity (2) is also provided with a second elastic element (62), one end of which is connected to the support (5) and the other end is connected to the inner wall of the cavity (2).

4. The structure of a self-fusing pipeline flame arrester as described in claim 2, characterized in that: The support (5) has a receiving groove (63) for accommodating the rotating rod (6).

5. The structure of a self-fusing pipeline flame arrester as described in claim 4, characterized in that: The rotating rod (6) has a first limiting groove (64), the support body (5) has a second limiting groove (65), and the end of the anti-rotation member (61) passes through the first limiting groove (64) and is located in the second limiting groove (65).

6. The structure of a self-fusing pipeline flame arrester as described in claim 5, characterized in that: There are two first limiting grooves (64), which are respectively opened at the two ends of the rotating rod (6). There are two second limiting grooves (65), and the two second limiting grooves (65) correspond one-to-one with the two first limiting grooves (64).

7. A self-fusing pipeline flame arrester structure as described in any one of claims 1-6, characterized in that: The valve core (4) has a valve head (43) and the valve head (43) is provided with a sealing ring (44).

8. The structure of a self-fusing pipeline flame arrester as described in claim 7, characterized in that: The inlet (21) has a flared opening (211), and the outer diameter of the sealing ring (44) is larger than the diameter of the inlet (21) and smaller than the diameter of the flared opening (211).

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