A gas quick connect backfire preventer

Abstract

The utility model discloses a kind of gas quick connection backfire preventers, belong to welding accessory technical field. Including: preventor body, its both ends are respectively equipped with air inlet connector and air outlet connector;Air outlet connector includes fixed base, locking sleeve and connector pipe, fixed base outer wall is equipped with locking groove, locking sleeve is sleeved in fixed base outer, the locking screw inserted in locking groove is inserted in its outer wall, connector pipe is detachably installed in fixed base;Annular groove in the outer wall of connector pipe is installed with stop ring;Locking sleeve inner wall is connected with limit plate, limit plate inner wall is equipped with vertical surface and inclined surface;Locking sleeve has locking and unlocking position: when locking, stop ring and inclined surface abut;When unlocking, limit plate moves down to make vertical surface and stop ring abut. Through the synergistic effect of locking sleeve, limit plate, stop ring and L-shaped locking groove, connector pipe can be quickly locked or released by hand sliding and rotating locking sleeve, it is easy to operate, applicable to the industrial scene of frequent replacement gas cylinder, significantly improve efficiency.

Description

Technical Field

[0001] This utility model belongs to the technical field of welding accessories, specifically relating to a gas quick-connect flashback preventer. Background Technology

[0002] In industrial applications such as metal cutting, welding, and heat treatment, flammable gases (such as gas, propane, natural gas, etc.) or combustion-supporting gases (such as oxygen) are often used as working media. These gases pose a risk of backfire during transport and use—that is, a flame propagates backward along the gas path to the gas source, potentially causing an explosion or equipment damage. Therefore, effective safety precautions must be taken.

[0003] A flashback arrestor is a critical safety device in a gas pipeline system. It is usually installed in series between the pressure regulator and the gas cylinder (or gas supply source) to block the propagation path of flashback flames and ensure operational safety.

[0004] However, traditional flashback arrestors typically use threaded connections between the inlet and outlet ends to connect to external pipelines or equipment. Although threaded connections offer high sealing and reliability, in applications requiring frequent cylinder assembly / disassembly, gas type switching, or equipment replacement, the process is cumbersome, time-consuming, and often relies on specialized tools such as wrenches. This not only reduces work efficiency but can also lead to loose connections or seal failure due to improper human operation. Utility Model Content

[0005] This invention addresses the aforementioned problems in the existing technology by proposing a gas quick-connect flashback preventer that is easy to assemble and disassemble.

[0006] This utility model can be achieved through the following technical solutions:

[0007] A gas quick-connect flashback arrestor, comprising:

[0008] The device body has an air inlet connector and an air outlet connector at both ends. The air inlet connector is used to connect to an external pressure reducer, and the air outlet connector is used to connect to an external gas cylinder.

[0009] The air outlet connector includes a fixed base, a locking sleeve, and a connector tube. The outer wall of the fixed base is provided with a locking groove. The locking sleeve is fitted over the fixed base, and a set screw is inserted into the outer wall of the locking sleeve. The set screw is embedded in the locking groove. The connector tube is detachably installed in the fixed base.

[0010] The outer wall of the connector pipe is provided with an annular groove, and a stop ring is installed in the annular groove;

[0011] The inner wall of the locking jacket is connected to a limiting plate, and the inner wall of the limiting plate is provided with a vertical surface and an inclined surface.

[0012] The locking jacket has a locking position and an unlocking position, wherein...

[0013] When the locking sleeve is in the locked position, the stop ring abuts against the inclined surface of the limiting plate, and the air outlet is in the locked state at this time;

[0014] When the locking cover moves to the unlocked position, the locking cover causes the limiting plate to move down until its vertical surface abuts against the stop ring, at which point the air outlet is in the unlocked state.

[0015] As a further improvement of this utility model, the locking groove is arranged in an L-shape and includes a horizontal section and a vertical section, wherein,

[0016] When the set screw is located within the horizontal section, the locking sleeve is in the locked position;

[0017] When the set screw is at the bottom of the vertical section, the locking sleeve is in the unlocked position.

[0018] As a further improvement of this utility model, a retaining ring is connected to the outer wall of the limiting plate, and a first spring is provided between the retaining ring and the fixed seat. The elastic force provided by the first spring to the retaining ring is transmitted to the locking sleeve through the limiting plate.

[0019] As a further improvement of this utility model, the preventer body further includes a middle shell, an air inlet shell, and an air outlet shell, wherein the air inlet shell and the air outlet shell are respectively installed at both ends of the middle shell, wherein...

[0020] The fixed base is connected to the air outlet housing;

[0021] The air intake connector is connected to the air intake end housing.

[0022] As a further improvement of this utility model, an intake valve assembly is provided between the intake end housing and the middle housing. The intake valve assembly includes an intake end spring seat and an intake valve core. A second spring is provided between the intake end spring seat and the intake valve core. The second spring always provides an elastic force to the intake valve core toward the intake valve port of the intake end housing.

[0023] As a further improvement of this utility model, a flame stop tube is provided between the air inlet end spring seat and the air inlet end housing, and a gap is left between the outer wall of the flame stop tube and the inner wall of the air inlet end housing to form a first air inlet channel.

[0024] As a further improvement of this utility model, a second air intake channel is provided in the air intake end spring seat, and the air intake valve port of the air intake end housing, the first air intake channel, the second air intake channel, and the air outlet valve port of the air intake end housing are connected in sequence.

[0025] As a further improvement of this utility model, an air outlet valve assembly is provided inside the air outlet housing. The air outlet valve assembly includes an air outlet spring seat and an air outlet valve core. A third spring is provided between the air outlet spring seat and the air outlet valve core. The third spring always provides an elastic force to the air outlet valve core toward the air inlet of the fixed seat.

[0026] As a further improvement of this utility model, a sealing ring is installed on the inner wall of the air outlet housing, wherein,

[0027] When the connector tube is installed, the sealing ring is sealed to the outer wall of the connector tube;

[0028] After the connector tube is disassembled, the third spring pushes the outlet spring seat to move to its outer wall and seal it with the sealing ring.

[0029] As a further improvement of this utility model, a gap is left between the air outlet spring seat and the air outlet housing to form an air outlet channel, and the air outlet valve port of the air inlet housing, the air inlet valve port of the air outlet housing, the air outlet channel, and the internal channel of the connector tube are connected in sequence.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] 1. Enables fast, reliable, and tool-free quick-connect operation: Through the coordinated operation of the locking sleeve, limit plate (including inclined and vertical surfaces), stop ring, and L-shaped locking groove, the locking sleeve can be slid and rotated by hand to lock or release the connector tube. The operation is simple and efficient, suitable for industrial scenarios where gas cylinders are frequently changed, and significantly improves work efficiency.

[0032] 2. Equipped with dual self-sealing and bidirectional leak-proof safety mechanisms: Both the inlet and outlet ends are equipped with normally closed spring-driven valve assemblies, which automatically close the valve port when there is no air pressure or the valve is disconnected; at the same time, the outlet end adopts a dual sealing structure of "connector in place sealing + spring seat self-sealing after disassembly", which effectively prevents gas leakage and air backflow, and greatly improves the safety of use.

[0033] 3. Integrated high-efficiency physical flame arresting function, significantly improving backfire prevention: By setting up a flame stop tube, combined with the detour air path design of the first air intake channel and the second air intake channel, the backfire flame is effectively extinguished while allowing normal gas flow, achieving reliable source flame arresting protection.

[0034] 4. Stable structure and strong anti-interference ability, suitable for harsh working conditions: The L-shaped locking groove and the set screw provide a clear locking / unlocking position. Combined with the restoring force of the first spring, it can effectively prevent accidental unlocking caused by vibration, accidental contact or pulling; the mechanical interlocking structure has low wear and long service life, ensuring long-term reliability.

[0035] 5. Modular three-section shell design for easy assembly, maintenance and universal compatibility: The middle shell, inlet shell and outlet shell are assembled separately, which facilitates the installation, maintenance and replacement of core components such as internal valves and flame arresters; at the same time, the inlet end adopts a standard interface to connect to the pressure regulator, and the outlet end integrates a quick-connect mechanism to connect to the gas cylinder, taking into account standardization, compactness and universality. Attached Figure Description

[0036] Figure 1 This is a cross-sectional view of the gas quick-connect flashback preventer of this utility model;

[0037] Figure 2 This is a schematic diagram of the structure of the gas quick-connect flashback preventer of this utility model;

[0038] Figure 3 This is the utility model Figure 2 A sectional view along AA.

[0039] In the diagram, 100 represents the central shell.

[0040] 200, Inlet housing; 210, Inlet connector; 220, Inlet spring seat; 230, Inlet valve core; 240, Second spring; 250, Flame stop tube; 260, First intake channel; 270, Second intake channel;

[0041] 300. Outlet housing; 310. Fixing base; 311. Locking groove; 320. Locking sleeve; 321. Set screw; 330. Connector tube; 331. Stop ring; 340. Limiting plate; 350. Retaining ring; 360. First spring; 370. Outlet spring seat; 380. Outlet valve core; 390. Third spring; 400. Sealing ring; 410. Outlet channel. Detailed Implementation

[0042] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. The technical methods of the present invention will be further described, but the present invention is not limited to these embodiments.

[0043] like Figures 1-3 As shown, this utility model provides a gas quick-connect flashback preventer, characterized in that it includes:

[0044] The device body has an air inlet connector 210 and an air outlet connector at both ends. The air inlet connector 210 is used to connect to an external pressure reducer, and the air outlet connector is used to connect to an external gas cylinder.

[0045] The air outlet connector includes a fixed base 310, a locking sleeve 320, and a connector tube 330. The outer wall of the fixed base 310 is provided with a locking groove 311. The locking sleeve 320 is sleeved on the outside of the fixed base 310, and a set screw 321 is inserted into the outer wall of the locking sleeve 320. The set screw 321 is embedded in the locking groove 311. The connector tube 330 is detachably installed in the fixed base 310.

[0046] The outer wall of the connector pipe 330 is provided with an annular groove, and a stop ring 331 is installed in the annular groove;

[0047] The inner wall of the locking jacket 320 is connected to a limiting plate 340, and the inner wall of the limiting plate 340 is provided with a vertical surface and an inclined surface.

[0048] The locking jacket 320 has a locking position and an unlocking position, wherein,

[0049] When the locking jacket 320 is in the locked position, the stop ring 331 abuts against the inclined surface of the limit plate 340, and the air outlet is in the locked state.

[0050] When the locking cover 320 moves to the unlocked position, the locking cover 320 causes the limiting plate 340 to move down until its vertical surface abuts against the stop ring 331, at which point the air outlet is in the unlocked state.

[0051] This structure, through the engagement of the inclined and vertical surfaces of the limiting plate 340 with the stop ring 331, enables the rapid locking and releasing of the connector tube 330.

[0052] After inserting the connector tube 330, slide it upward and rotate it horizontally to lock the outer sleeve 320, so that the inclined surface of the limiting plate 340 presses against the stop ring 331, and uses the radial component force generated by the inclined surface to lock the connector tube 330 axially.

[0053] When disassembly is required, rotate horizontally and pull down the locking sleeve 320. The limiting plate 340 will then descend and its vertical surface will align with the stop ring 331, releasing the axial constraint. The connector tube 330 can then be pulled out directly. The entire process requires no tools and can be completed by hand.

[0054] Compared to traditional threaded connections or simple snap-fit ​​structures, the quick-release mechanism of this utility model is not only easy to operate and reliable in connection, but also effectively prevents accidental disengagement caused by vibration, accidental contact or pulling, significantly improving the sealing performance and safety of the gas supply system.

[0055] Meanwhile, this mechanical interlocking method has a stable structure, low wear, and long service life, making it suitable for industrial environments where gas cylinders are frequently replaced.

[0056] Preferably, the locking groove 311 is L-shaped and includes a horizontal section and a vertical section, wherein,

[0057] When the set screw 321 is in the horizontal section, the locking sleeve 320 is in the locked position;

[0058] When the set screw 321 is at the bottom of the vertical section, the locking sleeve 320 is in the unlocked position.

[0059] The L-shaped groove, together with the set screw 321, forms a mechanical limiting and guiding structure: in the locked state, the set screw 321 is engaged in the horizontal section, restricting the axial downward movement of the locking sleeve 320, and ensuring that the inclined surface of the limiting plate 340 stably presses against the stop ring 331.

[0060] When unlocking is required, simply rotate and then press down the locking sleeve 320 to slide the set screw 321 along the vertical section to the bottom to complete the unlocking and positioning. The operation is intuitive, the stroke is clear, and it can effectively prevent the locking sleeve 320 from accidentally sliding due to vibration or accidental contact during use.

[0061] This design not only improves the operational reliability and positioning accuracy of the quick-connect mechanism, but also enhances the stability and security of the connection state, avoiding the defects of traditional straight groove or round hole structures that are prone to loosening and lack clear locking / unlocking position indications.

[0062] Preferably, a retaining ring 350 is connected to the outer wall of the limiting plate 340, and a first spring 360 is provided between the retaining ring 350 and the fixing seat 310. The elastic force provided by the first spring 360 to the retaining ring 350 is transmitted to the locking sleeve 320 through the limiting plate 340.

[0063] This structure ensures that the locking sleeve 320 is always subjected to an upward restoring force applied by the first spring 360 when no external force is applied. As a result, after the connector tube 330 is inserted, the locking sleeve 320 can automatically spring back and move upward. It only needs to be rotated to the locking position to ensure that the inclined surface of the limit plate 340 reliably presses against the stop ring 331 and realizes the self-locking function. This elastic restoring mechanism not only improves the convenience and safety of operation, but also enhances the connection reliability of the quick-connect mechanism under vibration or impact conditions.

[0064] Preferably, the device body further includes a middle housing 100, an inlet housing 200, and an outlet housing 300, with the inlet housing 200 and outlet housing 300 respectively installed at both ends of the middle housing 100.

[0065] The mounting base 310 is connected to the outlet housing 300;

[0066] The air intake connector 210 is connected to the air intake housing 200.

[0067] The three-section modular shell structure facilitates the assembly, maintenance and replacement of internal functional components (such as valves, flame arresters, etc.), and also helps to achieve independent design and sealed isolation of the functions on the intake and exhaust sides.

[0068] In addition, by integrating the quick-connect mechanism into the outlet housing 300 and setting the standard interface in the inlet housing 200, it can accommodate standardized connections with pressure regulators and gas cylinders, improving the overall structure's compactness, versatility, and ease of manufacturing.

[0069] Preferably, an intake valve assembly is provided between the intake end housing 200 and the middle housing 100. The intake valve assembly includes an intake end spring seat 220 and an intake valve core 230. A second spring 240 is provided between the intake end spring seat 220 and the intake valve core 230. The second spring 240 always provides elastic force to the intake valve core 230 in the direction of the intake valve port of the intake end housing 200.

[0070] This structure allows the intake valve core 230 to automatically press and seal against the intake valve port by the elastic force of the second spring 240 when there is no external airflow pressure, forming a normally closed state and effectively blocking the gas passage; when the pressure reducer supplies gas, the gas pressure overcomes the spring force and pushes open the valve core to achieve normal air passage.

[0071] Furthermore, a flame stop tube 250 is provided between the air inlet end spring seat 220 and the air inlet end housing 200. A gap is left between the outer wall of the flame stop tube 250 and the inner wall of the air inlet end housing 200 to form a first air inlet channel 260. That is, after the gas enters from the air inlet of the air inlet end housing 200, it must first pass through the inside of the flame stop tube 250, and then be transported backward through the first air inlet channel 260 formed by the gap between the outer wall of the flame stop tube 250 and the inner wall of the housing.

[0072] It should be noted that the flame stop tube 250 is made of fire-retardant materials such as porous metal sintered body, metal mesh or microporous structure. Its pores allow gas to pass through smoothly to maintain normal gas supply. However, when backfire occurs, the flame will be rapidly cooled and extinguished as it passes through the micro-channel due to heat dissipation from the wall, free radical quenching and a sudden drop in flow rate, thereby effectively blocking the flame from spreading towards the gas source.

[0073] This design achieves reliable physical flame arrestion without significantly increasing gas resistance, thus significantly improving the safety protection level of the flashback arrestor.

[0074] Preferably, a second air intake channel 270 is provided in the air intake end spring seat 220, and the air intake valve port of the air intake end housing 200, the first air intake channel 260, the second air intake channel 270, and the air outlet valve port of the air intake end housing 200 are connected in sequence to form a continuous and controlled gas flow path.

[0075] This multi-stage gas path design not only ensures that the gas can smoothly enter the interior of the flame arrestor body after passing through the flame arrestor tube 250 to achieve the flame arresting function, but also enhances the cooling and blocking effect on the backfire flame through the reasonable layout of the channels.

[0076] Preferably, the outlet end housing 300 is provided with an outlet valve assembly, which includes an outlet end spring seat 370 and an outlet valve core 380. A third spring 390 is provided between the outlet end spring seat 370 and the outlet valve core 380. The third spring 390 always provides elastic force to the outlet valve core 380 toward the air inlet of the fixed seat 310.

[0077] This structure allows the exhaust valve core 380 to automatically press and seal against the intake valve port of the fixed seat 310 under the elastic force of the third spring 390 when there is no airflow, maintaining a normally closed state.

[0078] Once sufficient air pressure is built up within the device, the airflow acts on the outlet valve core 380, overcoming the spring force and pushing it backward, thereby opening the valve port to allow airflow. This opening process is driven by airflow pressure, ensuring that the air path is only opened when the system is supplying air normally, and that it can quickly and automatically close in case of air outage or abnormal leakage pressure, effectively preventing gas leakage or air backflow, and improving overall safety and reliability.

[0079] Preferably, a sealing ring 400 is installed on the inner wall of the outlet housing 300, wherein,

[0080] When the connector tube 330 is installed, the sealing ring 400 fits tightly against the outer wall of the connector tube 330 to form a reliable radial seal, ensuring that gas does not leak in the outlet channel 410.

[0081] When the connector tube 330 is disassembled, the third spring 390 pushes the outlet valve core 380 and the corresponding outlet spring seat 370 to return to their axial position, so that the outer wall of the outlet spring seat 370 presses tightly against the sealing ring 400, thereby automatically establishing a closed barrier inside the outlet housing 300 to prevent gas from escaping outward.

[0082] This dual sealing mechanism achieves the function of "conducting with a tube and self-sealing without a tube": ensuring airtightness when connected and actively sealing when disconnected, effectively preventing gas leakage and backflow of air into the system, and significantly improving the safety and environmental adaptability of quick-connect interfaces under frequent plugging and unplugging conditions.

[0083] Preferably, a gap is left between the outlet end spring seat 370 and the outlet end housing 300 to form an outlet channel 410. The outlet valve port of the inlet end housing 200, the inlet valve port of the outlet end housing 300, the outlet channel 410, and the internal channel of the connector pipe 330 are connected in sequence to form a complete gas output path.

[0084] The intermittent venting channel 410 design ensures that after the venting valve assembly is opened, gas can smoothly enter the connector tube 330 from the preventer body through the annular gap; at the same time, when the connector tube 330 is pulled out, the venting valve core 380 quickly resets and closes the valve port under the action of the third spring 390, and automatically cuts off the gas in conjunction with the sealing ring 400, effectively preventing gas leakage.

[0085] This structure balances ventilation efficiency with a secure seal, improving the overall performance and reliability of the device.

[0086] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

[0087] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0088] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0089] The technical solutions of the various embodiments of this utility model can be combined with each other, but only if they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0090] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A gas quick-connect flashback preventer, characterized in that, include: The device body has an air inlet connector and an air outlet connector at both ends. The air inlet connector is used to connect to an external pressure reducer, and the air outlet connector is used to connect to an external gas cylinder. The air outlet connector includes a fixed base, a locking sleeve, and a connector tube. The outer wall of the fixed base is provided with a locking groove. The locking sleeve is fitted over the fixed base, and a set screw is inserted into the outer wall of the locking sleeve. The set screw is embedded in the locking groove. The connector tube is detachably installed in the fixed base. The outer wall of the connector pipe is provided with an annular groove, and a stop ring is installed in the annular groove; The inner wall of the locking jacket is connected to a limiting plate, and the inner wall of the limiting plate is provided with a vertical surface and an inclined surface. The locking jacket has a locking position and an unlocking position, wherein... When the locking sleeve is in the locked position, the stop ring abuts against the inclined surface of the limiting plate, and the air outlet is in the locked state at this time; When the locking cover moves to the unlocked position, the locking cover causes the limiting plate to move down until its vertical surface abuts against the stop ring, at which point the air outlet is in the unlocked state.

2. The gas quick-connect flashback preventer according to claim 1, characterized in that, The locking groove is L-shaped and includes a horizontal section and a vertical section, wherein... When the set screw is located within the horizontal section, the locking sleeve is in the locked position; When the set screw is at the bottom of the vertical section, the locking sleeve is in the unlocked position.

3. A gas quick-connect flashback preventer according to claim 1, characterized in that, A retaining ring is connected to the outer wall of the limiting plate, and a first spring is provided between the retaining ring and the fixed seat. The elastic force provided by the first spring to the retaining ring is transmitted to the locking sleeve through the limiting plate.

4. A gas quick-connect flashback preventer according to claim 1, characterized in that, The device body further includes a central housing, an inlet housing, and an outlet housing, wherein the inlet housing and the outlet housing are respectively installed at both ends of the central housing. The fixed base is connected to the air outlet housing; The air intake connector is connected to the air intake end housing.

5. A gas quick-connect flashback preventer according to claim 4, characterized in that, An intake valve assembly is provided between the intake end housing and the middle housing. The intake valve assembly includes an intake end spring seat and an intake valve core. A second spring is provided between the intake end spring seat and the intake valve core. The second spring always provides an elastic force to the intake valve core toward the intake valve port of the intake end housing.

6. A gas quick-connect flashback preventer according to claim 5, characterized in that, A flame stop tube is provided between the air inlet end spring seat and the air inlet end housing. A gap is left between the outer wall of the flame stop tube and the inner wall of the air inlet end housing to form a first air inlet channel.

7. A gas quick-connect flashback preventer according to claim 6, characterized in that, The air inlet spring seat has a second air inlet channel, and the air inlet valve port of the air inlet housing, the first air inlet channel, the second air inlet channel, and the air outlet valve port of the air inlet housing are connected in sequence.

8. A gas quick-connect flashback preventer according to claim 4, characterized in that, An air outlet valve assembly is provided inside the air outlet housing. The air outlet valve assembly includes an air outlet spring seat and an air outlet valve core. A third spring is provided between the air outlet spring seat and the air outlet valve core. The third spring always provides an elastic force to the air outlet valve core toward the air inlet of the fixed seat.

9. A gas quick-connect flashback preventer according to claim 8, characterized in that, A sealing ring is installed on the inner wall of the outlet end housing, wherein, When the connector tube is installed, the sealing ring is sealed to the outer wall of the connector tube; After the connector tube is disassembled, the third spring pushes the outlet spring seat to move to its outer wall and seal it with the sealing ring.

10. A gas quick-connect flashback preventer according to claim 8, characterized in that, A gap is left between the air outlet spring seat and the air outlet housing to form an air outlet channel. The air outlet valve port of the air inlet housing, the air inlet valve port of the air outlet housing, the air outlet channel, and the internal channel of the connector pipe are connected in sequence.

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