Gas flame arrester

Abstract

The present invention relates to the technical field of torpedo ladle baking. Disclosed is a gas flame arrester, comprising: a medium pipe. A gas nozzle is provided in the medium pipe, and a flame-arresting slingshot is also provided in the medium pipe. The flame-arresting slingshot comprises a slingshot frame, a slingshot rod, a spring, and a plug. When a flareback occurs in the medium pipe, a brazed part between the slingshot rod and the slingshot frame melts due to heat, and then the spring pushes the slingshot rod to extend relative to the slingshot frame, causing the plug to block the gas nozzle, thereby closing the gas channel and preventing flame propagation. The gas flame arrester provided by the present invention can effectively prevent flame propagation while basically not increasing system resistance, does not affect the normal flow and pressure of a pipe system, has a simple structure, and allows for convenient and quick installation and maintenance, greatly reducing manufacturing, usage, and maintenance costs.

Description

Gas flame arrestor TECHNICAL FIELD

[0001] The present application relates to the technical field of torpedo can roasting, in particular to a gas flame arrestor. BACKGROUND

[0002] The principle of the existing gas flame arrestor in the torpedo can roasting assembly is mainly based on the phenomenon that the flame is extinguished due to heat loss when passing through narrow pores or channels. Specifically, the flame arrestor is usually composed of many small, uniform or non-uniform channels or pores, the size of which is designed to be as small as possible to allow only the flame to pass through; when the flame enters the flame arrestor, it is divided into many small flame streams; due to the large heat transfer area of the channels or pores, heat exchange occurs when the flame passes through the channel wall, resulting in a significant drop in temperature; when the temperature decreases to a certain extent, the combustion conditions of the flame are no longer met, and therefore the flame is extinguished.

[0003] However, such dense and narrow pore channels, while preventing the spread of the flame, also increase the system resistance loss, which can affect the normal flow and pressure of the pipeline system. SUMMARY

[0004] In view of the above-mentioned deficiencies existing at present, the present application provides a gas flame arrestor which can effectively prevent the spread of the flame while basically not increasing the system resistance, not affecting the normal flow and pressure of the pipeline system, having a simple structure, and being convenient and fast to install and maintain, thereby greatly reducing the manufacturing, use and maintenance costs.

[0005] To achieve the above-mentioned purpose, the embodiments of the present application adopt the following technical solutions:

[0006] A gas flame arrestor comprises a medium pipeline, a gas nozzle is arranged in the medium pipeline, and a flame arrestor bow is also arranged in the medium pipeline. The flame arrestor bow comprises a bow holder, a bow rod, a spring and a plug. When backfire occurs in the medium pipeline, the brazing part between the bow rod and the bow holder is melted by heat, and then the spring pushes the bow rod to extend relative to the bow holder, so that the plug blocks the gas nozzle, thereby closing the gas passage and preventing the spread of the flame.

[0007] According to an aspect of the present application, the bow holder is fixed in the medium pipeline, the bow rod is sleeved in the bow holder, one end of the bow rod is brazed with the bow holder, and the other end of the bow rod is fixed with the plug, the spring is sleeved on the bow rod, and the spring is arranged between the bow holder and the plug, and the plug is aligned with the gas nozzle.

[0008] According to an aspect of the present application, the bow holder is provided with an elastic protrusion, and the bow holder is extruded and attached to the inner wall of the medium pipeline through the elastic protrusion.

[0009] According to one aspect of the present application, the medium pipeline is further provided with an auxiliary positioning structure, which is used for assisting the positioning and installation of the bow bracket in the medium pipeline.

[0010] According to one aspect of the present application, the medium pipeline is provided with a combustion-supporting gas inlet and a premixed gas outlet, and the combustion-supporting gas and the fuel gas enter the medium pipeline through the combustion-supporting gas inlet and the fuel gas nozzle respectively for premixing, and the mixed gas of the combustion-supporting gas and the fuel gas flows out through the premixed gas outlet.

[0011] According to one aspect of the present application, the medium pipeline is further provided with a guide groove, and the bow bracket enters the medium pipeline along the guide groove for fixed installation.

[0012] According to one aspect of the present application, the auxiliary positioning structure comprises a V-shaped structure and a baffle, the baffle is fixed in the V-shaped structure, and one end of the bow bracket is arranged in the V-shaped structure and connected with the baffle in contact.

[0013] According to one aspect of the present application, the V-shaped structure comprises two groups of arc-shaped protrusions, which are arranged in a V-shaped manner and fixed in the medium pipeline.

[0014] According to one aspect of the present application, the cross-sectional area of the fire-blocking bow is smaller than that of the inner wall of the medium pipeline.

[0015] According to one aspect of the present application, the width and the height of the two ends of the fire-blocking bow are smaller than the inner diameter of the medium pipeline.

[0016] The advantages of the present application are as follows: when backfire occurs in the medium pipeline, the brazing part between the bow rod and the bow bracket is melted by heat, and then the spring pushes the bow rod to extend relative to the bow bracket, so that the plug blocks the fuel gas nozzle, thereby closing the fuel gas passage and preventing the spread of fire; thus, compared with the existing fire arrester, the product can effectively prevent the spread of fire while basically not increasing the system resistance and not affecting the normal flow and pressure of the pipeline system. Since the cross-sectional area of the fire-blocking bow is smaller than that of the inner wall of the medium pipeline, the pipeline in the product will not be affected by the normal flow and pressure, and the system resistance will not be basically increased. By setting the elastic protrusion, the bow bracket is pressed and fitted with the inner wall of the medium pipeline through the elastic protrusion, and the like, the installation and maintenance process of the product is convenient and fast. The fire-blocking bow of the product is a disposable device, and only the fire-blocking bow is damaged during backfire, and the external device is not damaged. When overhauling, the new fire-blocking bow can be conveniently replaced, and the external pipeline can continue to be used, which greatly reduces the use and maintenance cost of the overall equipment. The overall structure of the product is simple, and it is easy to disassemble, manufacture and process. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to make the technical solutions in the embodiments of the present application clearer, the drawings needed in the embodiments will be briefly introduced as follows. Obviously, the drawings described in the following embodiments are only some of the embodiments of the present application, and all other drawings obtained by those of ordinary skill in the art without any creative effort based on these drawings also belong to the protection scope of the present application.

[0018] Fig. 1 is a perspective view of the structure of the present application;

[0019] Fig. 2 is a sectional view of the structure of the present application;

[0020] Fig. 3 is a sectional perspective view of the structure of the present application;

[0021] Fig. 4 is a schematic view of the structure of the fire-retardant bow of the present application.

[0022] The names corresponding to the serial numbers in the drawings are as follows:

[0023] 1, medium pipeline; 11, premixed gas outlet; 12, combustion-supporting gas inlet; 2, gas nozzle; 21, gas inlet; 3, fire-retardant bow; 4, bow bracket; 41, upper frame plate; 42, lower frame plate; 43, end plate; 44, left reinforcing plate; 45, right reinforcing plate; 5, bow rod; 6, spring; 7, plug; 8, brazing material; 9, arc-shaped protrusion; 10, baffle. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings of the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort belong to the protection scope of the present application. In the description of the present application, it should be noted that the orientations or position relationships indicated by the terms "top", "bottom", "one side", "the other side", "front", "back", "middle part", "inside", "top end", "bottom end" and the like are based on the orientations or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and thus cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and thus cannot be understood as a limitation of the present application.

[0025] Embodiment one

[0026] As shown in FIG. 1-4, a gas flame arrester is installed in a torpedo tank roaster or used in any roasting device; the gas flame arrester comprises a medium pipeline 1, a gas nozzle 2, and a flame arrester bow 3. The medium pipeline 1 is a circular tube, and the left and right ends of the medium pipeline 1 are respectively provided with a premixed gas outlet 11 and a combustion-supporting gas inlet 12; the combustion-supporting gas inlet 12 is used as a combustion-supporting gas inlet connection port; the premixed gas outlet 11 is used as a mixed gas outlet of the combustion-supporting gas and the gas; the combustion-supporting gas and the gas are premixed by respectively passing through the combustion-supporting gas inlet 12 and the gas nozzle 2 into the medium pipeline 1, and the mixed gas of the combustion-supporting gas and the gas flows out through the premixed gas outlet 11. The gas nozzle 2 extends into the medium pipeline 1, and the gas nozzle 2 is used as a combustible gas injection outlet; the gas nozzle 2 and the combustion-supporting gas inlet 12 are both located at the right end of the medium pipeline 1; the gas nozzle 2 is communicated with a gas inlet 21 at the end of the gas nozzle 2, and the gas inlet 21 is vertically and integrally penetrated through the medium pipeline 1; the gas inlet 21 is used as a combustible gas inlet connection port; the overall structure of the gas nozzle 2 is in an L shape, and the outlet end of the gas nozzle 2 is in a semispherical shape; the gas enters the gas inlet 21 and then flows into the medium pipeline 1 through the gas nozzle 2. The flame arrester bow 3 is fixed in the medium pipeline 1 and used for blocking the gas delivery; the flame arrester bow 3 comprises a bow holder 4, a bow rod 5, a spring 6, and a plug 7; the bow holder 4 is fixed in the medium pipeline 1, the bow rod 5 is sleeved in the bow holder 4, one end of the bow rod 5 is brazed with the bow holder 4, the other end of the bow rod 5 is fixed with the plug 7, the spring 6 is sleeved on the bow rod 5, the spring 6 is arranged between the bow holder 4 and the plug 7, and the plug 7 is aligned with the gas nozzle 2. In a normal state, i.e. during normal operation, the spring 6 is in a compressed state; when backfire occurs in the medium pipeline 1, the brazed part between the bow rod 5 and the bow holder 4 is heated and melted, and then the spring 6 pushes the bow rod 5 to extend relative to the bow holder 4, so that the plug 7 blocks the gas nozzle 2, thereby closing the gas channel and preventing the flame from spreading.

[0027] In the embodiment, the cross-sectional area of the flame arrester bow 3 is smaller than the cross-sectional area of the inner wall of the medium pipeline 1, or the width and the height of the left and right ends of the flame arrester bow 3 are both smaller than the inner diameter of the medium pipeline 1. In this way, compared with the structural arrangement of the conventional pipeline flame arrester (blocking the entire pipeline and leaving only a few small pores or channels for the flame to pass through), the flame arrester bow 3 does not hinder the circulation of the gas in the medium pipeline 1 during normal operation of the product, i.e. does not substantially increase the system resistance and does not affect the normal flow and pressure of the pipeline system.

[0028] In the embodiment, the spring 6 is arranged at the middle position of the upper and lower ends of the bow holder 4; when the bow holder 4 is inserted into the medium pipeline 1, the bow holder 4 can be clamped by extrusion with the inner wall of the medium pipeline 1 through the elastic protrusions, so that the bow holder 4 is firmly attached to the inner wall of the medium pipeline 1, i.e. the bow holder 4 is fixedly installed in the medium pipeline 1.

[0029] In the embodiment, the bow frame 4 is in a square frame structure, which includes an upper frame plate 41, a lower frame plate 42, an end plate 43, a left reinforcing plate 44, and a right reinforcing plate 45, all of which are in square plate shapes; the upper frame plate 41 and the lower frame plate 42 are identical in structure and arranged in parallel with each other; the end plate 43 is arranged vertically, and its upper and lower ends are integrally and vertically connected with the left end of the upper frame plate 41 and the left end of the lower frame plate 42, respectively; the left reinforcing plate 44 and the right reinforcing plate 45 are identical in structure and arranged in parallel with each other, and both are fixed vertically between the upper frame plate 41 and the lower frame plate 42 for supporting and reinforcing the structure. The middle positions of the upper frame plate 41 and the lower frame plate 42 are outwardly protruded and have a certain elasticity, or in other words, the elastic protrusions are arranged at the middle positions of the upper frame plate 41 and the lower frame plate 42, respectively; the left and right ends of the upper frame plate 41 and the lower frame plate 42 are in flat plate shapes, and the middle positions are in V-shaped plate shapes or arc-shaped plate shapes. The bow frame 4 is provided with a through hole, which penetrates the central positions of the end plate 43, the left reinforcing plate 44, and the right reinforcing plate 45 from left to right; the bow rod 5 is in a circular rod shape and is inserted into the through hole; the bow rod 5 (plug 7), the through hole, and the gas nozzle 2 are coaxial, and the manufacturing precision is strictly controlled to avoid improper closing. The left end of the bow rod 5 is welded with the end plate 43 through a brazing material 8, and the right end of the bow rod 5 is integrally fixed with the plug 7; the spring 6 is arranged between the right reinforcing plate 45 and the plug 7. The width of the bow frame 4 and the heights of the left and right ends are all less than the inner diameter of the medium pipeline 1, so that the bow frame 4 is convenient to be inserted into or extracted from the medium pipeline 1 and convenient to be disassembled and assembled; the square frame structure of the bow frame 4 is simple in structure and easy to manufacture and process.

[0030] In the embodiment, the medium pipeline 1 is also provided with an auxiliary positioning structure, which is used for assisting the positioning and installation of the bow frame 4 in the medium pipeline 1. The auxiliary positioning structure has two groups, which are fixed in the medium pipeline 1 one above the other, and the gas outlet end of the gas nozzle 2 is located between the two groups of auxiliary positioning structures; the auxiliary positioning structure includes a V-shaped structure and a baffle 10, the V-shaped structure is used for fixing the installation orientation of the flame arrestor bow 3, and the baffle 10 is used for limiting the installation depth of the flame arrestor bow 3; the baffle 10 is fixed in the V-shaped structure, and the right end of the bow frame 4 is arranged in the V-shaped structure and is in contact with the baffle 10. The V-shaped structure includes two groups of arc-shaped protrusions 9, which are in semi-cylindrical shapes and are arranged in a V-shaped manner in the medium pipeline 1; the baffle 10 is fixed between the two groups of arc-shaped protrusions 9. The right ends of the upper frame plate 41 and the lower frame plate 42 respectively extend between the two groups of arc-shaped protrusions 9 (so as to ensure that the entire flame arrestor bow 3 is in the installation orientation inside the medium pipeline 1 and also to ensure that the flame arrestor bow 3 or the plug 7 is aligned with the orientation of the gas nozzle 2), and are in contact with the baffle 10 (so as to limit the height or depth of the entire flame arrestor bow 3 installed inside the medium pipeline 1).

[0031] In the embodiment, the plug 7 is hemispherical, and its structural shape is adapted to the structural shape of the gas nozzle 2, so that the plug 7 can plug the gas nozzle 2; the spherical structure of the plug 7 can make the sealing more tight. The elastic arch 4 and the elastic bow 5 are made of stainless steel 304 as the brazing base material, and the melting point temperature is about 1400℃; the brazing material 8 is made of silver-based brazing material 8, and the melting point temperature is selected to be 600-800℃, so that the welding strength between the left end of the elastic bow 5 and the end plate 43 of the elastic arch 4 can be ensured, and the elastic bow 5 is firmly connected without tempering, and the melting effect can be ensured; when tempering occurs, the flame temperature is much higher than the melting point temperature of the welding material, so that the fireproof elastic bow 3 can quickly act to realize the fireproof function and protect other equipment from being affected. The selection of the brazing material 8 should match the normal working temperature and the mixed gas combustion flame temperature, so as to ensure the structural stability during normal working and ensure the rapid heating melting during the mixed gas tempering; the selection of the elastic modulus of the spring 6 and the design of the compression amount of the spring 6 are determined according to the installation position of the fireproof elastic bow 3 and the relative position of the gas nozzle 2 and the auxiliary positioning structure.

[0032] The principle of the embodiment is that when tempering occurs in the medium pipeline 1, the brazing part between the elastic bow 5 and the elastic arch 4 is heated and melted, the connection between the left end of the elastic bow 5 and the elastic arch 4 is disconnected, and then the compressed spring 6 returns to the free stretching state to push the elastic bow 5 to pop out relative to the elastic arch 4, so that the plug 7 at the right end of the elastic bow 5 plugs the gas nozzle 2, and the two form a perfect spherical sealing, so as to close the gas passage and prevent the flame from spreading.

[0033] The beneficial effects of the embodiment are that the product can effectively prevent the flame from spreading while basically not increasing the system resistance and not affecting the normal flow and pressure of the pipeline system. Since the cross-sectional area of the fireproof elastic bow 3 is smaller than the cross-sectional area of the inner wall of the medium pipeline 1, the pipeline in the product will not be affected by the normal flow and pressure, and the system resistance will not be basically increased. By setting the elastic protrusion, the elastic arch 4 is pressed and fitted with the inner wall of the medium pipeline 1 through the elastic protrusion, that is, the fireproof elastic bow 3 is connected with the external medium pipeline 1 through simple mechanical cooperation, so that the installation and maintenance process of the product is convenient and fast. The fireproof elastic bow 3 of the product is a disposable device, and only the fireproof elastic bow 3 is damaged when tempering occurs, and the external equipment is not damaged. When overhauling, the new fireproof elastic bow 3 can be easily replaced, and the external pipeline can continue to be used, which greatly reduces the use and maintenance cost of the overall equipment. The overall structure of the product is simple, easy to disassemble and manufacture, low in cost, and high in economy.

[0034] Embodiment two

[0035] The gas flame arrester is installed in a torpedo tank roaster or used in any roasting device. The gas flame arrester comprises a medium pipeline 1, a gas nozzle 2 and a flame arrester bow 3. The medium pipeline 1 is a circular tube, and the left and right ends of the medium pipeline 1 are respectively provided with a premixed gas outlet 11 and a combustion-supporting gas inlet 12. The combustion-supporting gas inlet 12 is used as a combustion-supporting gas inlet connecting port. The premixed gas outlet 11 is used as a mixed gas outlet of the combustion-supporting gas and the gas. The combustion-supporting gas and the gas are premixed by respectively passing through the combustion-supporting gas inlet 12 and the gas nozzle 2 into the medium pipeline 1, and the mixed gas of the combustion-supporting gas and the gas flows out through the premixed gas outlet 11. The gas nozzle 2 extends into the medium pipeline 1, and the gas nozzle 2 is used as a combustible gas injection outlet. The gas nozzle 2 and the combustion-supporting gas inlet 12 are both located at the right end of the medium pipeline 1. The gas nozzle 2 is provided with a gas inlet 21 at the end thereof, and the gas inlet 21 vertically and integrally penetrates the medium pipeline 1. The gas inlet 21 is used as a combustible gas inlet connecting port. The overall structure of the gas nozzle 2 is in an L shape, and the outlet end of the gas nozzle 2 is in a semispherical shape. The gas enters the gas inlet 21 and then flows into the medium pipeline 1 through the gas nozzle 2. The flame arrester bow 3 is fixed in the medium pipeline 1 and used for blocking the gas delivery. The flame arrester bow 3 comprises a bow holder 4, a bow rod 5, a spring 6 and a plug 7. The bow holder 4 is fixed in the medium pipeline 1, the bow rod 5 is sleeved in the bow holder 4, one end of the bow rod 5 is brazed to the bow holder 4, the other end of the bow rod 5 is fixed to the plug 7, the spring 6 is sleeved on the bow rod 5, the spring 6 is arranged between the bow holder 4 and the plug 7, and the plug 7 is aligned with the gas nozzle 2. In a normal state, i.e. during normal operation, the spring 6 is in a compressed state. When backfire occurs in the medium pipeline 1, the brazed part between the bow rod 5 and the bow holder 4 is heated and melted, and then the spring 6 pushes the bow rod 5 to extend relative to the bow holder 4, so that the plug 7 blocks the gas nozzle 2, thereby closing the gas channel and preventing the flame from spreading.

[0036] In the embodiment, the cross-sectional area of the flame arrester bow 3 is smaller than the cross-sectional area of the inner wall of the medium pipeline 1, or the width and the height of the left and right ends of the flame arrester bow 3 are both smaller than the inner diameter of the medium pipeline 1. In this way, compared with the structure of the conventional pipeline flame arrester (blocking the entire pipeline and leaving only a few small pores or channels for the flame to pass through), the flame arrester bow 3 does not hinder the circulation of the gas in the medium pipeline 1 during normal operation of the product, i.e. does not increase the system resistance and does not affect the normal flow and pressure of the pipeline system.

[0037] In the embodiment, the spring 6 is arranged at the middle position of the upper and lower ends of the bow holder 4. When the bow holder 4 is inserted into the medium pipeline 1, the bow holder 4 can be clamped by extrusion with the inner wall of the medium pipeline 1 through the elastic protrusions, so that the bow holder 4 is firmly attached to the inner wall of the medium pipeline 1, i.e. the bow holder 4 is fixedly installed in the medium pipeline 1.

[0038] In the embodiment, the bow frame 4 is in a square frame structure, which includes an upper frame plate 41, a lower frame plate 42, an end plate 43, a left reinforcing plate 44, and a right reinforcing plate 45, all of which are in square plate shapes; the upper frame plate 41 and the lower frame plate 42 are identical in structure and arranged in parallel with each other; the end plate 43 is arranged vertically, and its upper and lower ends are integrally and vertically connected with the left end of the upper frame plate 41 and the left end of the lower frame plate 42, respectively; the left reinforcing plate 44 and the right reinforcing plate 45 are identical in structure and arranged in parallel with each other, and both are fixed vertically between the upper frame plate 41 and the lower frame plate 42 for supporting and reinforcing the structure. The middle positions of the upper frame plate 41 and the lower frame plate 42 are outwardly protruded and have a certain elasticity, or in other words, the elastic protrusions are arranged at the middle positions of the upper frame plate 41 and the lower frame plate 42, respectively; the left and right ends of the upper frame plate 41 and the lower frame plate 42 are in flat plate shapes, and the middle positions are in V-shaped plate shapes or arc-shaped plate shapes. The bow frame 4 is provided with a through hole, which penetrates the central positions of the end plate 43, the left reinforcing plate 44, and the right reinforcing plate 45 from left to right; the bow rod 5 is in a circular rod shape and is inserted into the through hole; the bow rod 5 (plug 7), the through hole, and the gas nozzle 2 are coaxial, and the manufacturing precision is strictly controlled to avoid improper closing. The left end of the bow rod 5 is welded with the end plate 43 through a brazing material 8, and the right end of the bow rod 5 is integrally fixed with the plug 7; the spring 6 is arranged between the right reinforcing plate 45 and the plug 7. The width of the bow frame 4 and the heights of the left and right ends are all less than the inner diameter of the medium pipeline 1, so that the bow frame 4 is convenient to be inserted into or extracted from the medium pipeline 1 and convenient to be disassembled and assembled; the square frame structure of the bow frame 4 is simple in structure and easy to manufacture and process.

[0039] In the embodiment, the medium pipeline 1 is also provided with an auxiliary positioning structure, which is used for assisting the positioning and installation of the bow frame 4 in the medium pipeline 1. The auxiliary positioning structure has two groups, which are fixed in the medium pipeline 1 one above the other, and the gas outlet end of the gas nozzle 2 is located between the two groups of auxiliary positioning structures; the auxiliary positioning structure includes a V-shaped structure and a baffle 10, the V-shaped structure is used for fixing the installation direction of the flame arrestor 3, and the baffle 10 is used for limiting the installation depth of the flame arrestor 3; the baffle 10 is fixed in the V-shaped structure, and the right end of the bow frame 4 is arranged in the V-shaped structure and is in contact with the baffle 10. The V-shaped structure includes two groups of arc-shaped protrusions 9, which are in semi-cylindrical shapes, and the two groups of arc-shaped protrusions 9 are arranged in a V-shaped manner and fixed in the medium pipeline 1; the baffle 10 is fixed between the two groups of arc-shaped protrusions 9. The right ends of the upper frame plate 41 and the lower frame plate 42 respectively extend between the two groups of arc-shaped protrusions 9 (so as to ensure that the entire flame arrestor 3 is in the installation direction inside the medium pipeline 1 and also to ensure that the flame arrestor 3 or the plug 7 is aligned with the direction of the gas nozzle 2), and are in contact with the baffle 10 (so as to limit the height or depth of the entire flame arrestor 3 installed in the medium pipeline 1), and the baffle 10 can abut against the right end faces of the upper and lower frame plates to limit the position.

[0040] In the embodiment, the plug 7 is hemispherical, and its structural shape is adapted to the structural shape of the gas nozzle 2, so that the plug 7 can plug the gas nozzle 2; the spherical surface structure of the plug 7 can make the sealing more airtight. The crossbow bracket 4 and the crossbow rod 5 are made of stainless steel 304 as the brazing base material, and the melting point temperature is about 1400°C; the brazing material 8 is made of silver-based brazing material 8, and the melting point temperature is selected to be 600-800°C, so as to ensure the welding strength between the left end of the crossbow rod 5 and the end plate 43 of the crossbow bracket 4, and firmly connect when there is no tempering, and also ensure the melting effect; when tempering occurs, the flame temperature is much higher than the melting point temperature of the welding material, so that the fireproof crossbow 3 can quickly act to realize the fireproof function and protect other equipment from being affected. The selection of the brazing material 8 should match the normal working temperature and the mixed gas combustion flame temperature, so as to ensure the structural stability during normal work and ensure the rapid heating and melting when the mixed gas is tempered; the selection of the spring modulus of the spring 6 and the design of the spring compression amount are determined according to the installation position of the fireproof crossbow 3 and the relative position of the gas nozzle 2 and the auxiliary positioning structure.

[0041] In the embodiment, a guide groove (not shown in the figure) is also arranged in the medium pipeline 1, and the crossbow bracket 4 enters the medium pipeline 1 for fixed installation along the guide groove. The guide groove is a U-shaped groove, and there are two groups of guide grooves symmetrically arranged above and below the middle position inside the medium pipeline 1, and the guide groove extends from the left end of the medium pipeline 1 to the front of the auxiliary positioning structure; the crossbow bracket 4 (or the entire fireproof crossbow 3) can be inserted into or extracted from the medium pipeline 1 along the guide groove. In this way, the guide groove not only facilitates the disassembly and installation of the fireproof crossbow 3, but also plays an auxiliary installation and positioning role for the fireproof crossbow 3.

[0042] The principle of the embodiment is that when tempering occurs in the medium pipeline 1, the brazing part between the crossbow rod 5 and the crossbow bracket 4 is heated and melted, disconnecting the connection between the left end of the crossbow rod 5 and the crossbow bracket 4, and then the compressed spring 6 returns to the free stretching state to push the crossbow rod 5 to pop out relative to the crossbow bracket 4, so that the plug 7 at the right end of the crossbow rod 5 plugs the gas nozzle 2, and the two form a perfect spherical sealing, so as to close the gas passage and prevent the flame from spreading.

[0043] The beneficial effect of the embodiment is that the product can effectively prevent flame propagation while not increasing the system resistance, and does not affect the normal flow and pressure of the pipeline system compared with the existing flame arrester. Since the cross-sectional area of the bow 3 is smaller than the cross-sectional area of the inner wall of the medium pipeline 1, the pipeline in the product will not be affected by the normal flow and pressure, and the system resistance will not be increased. By setting the elastic protrusion, the elastic protrusion is pressed and fitted with the inner wall of the medium pipeline 1 through the elastic protrusion, that is, the flame arrester bow 3 and the external medium pipeline 1 are connected through simple mechanical cooperation, and the product is convenient and fast to install and maintain. The flame arrester bow 3 of the product is a disposable device, and only the flame arrester bow 3 is damaged when backfiring, and the external device is not damaged. When overhauling, the new flame arrester bow 3 can be easily replaced, and the external pipeline can continue to be used, which greatly reduces the use and maintenance cost of the overall equipment. By setting the guide groove, the product is convenient to disassemble and position. The overall structure of the product is simple, easy to disassemble and manufacture, low in cost, and high in economy.

[0044] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any skilled person in the art can easily think of changes or replacements within the scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A gas flame arrester comprising a medium duct (1) in which a gas nozzle (2) is arranged, characterized in that The medium pipeline (1) is further provided with a fire blocking crossbow (3), the fire blocking crossbow (3) comprises a crossbow frame (4), a crossbow rod (5), a spring (6) and a plug (7), when backfire occurs in the medium pipeline (1), the brazing part between the crossbow rod (5) and the crossbow frame (4) is heated and fused, then the spring (6) pushes the crossbow rod (5) to extend relative to the crossbow frame (4), so that the plug (7) blocks the gas nozzle (2), thereby closing the gas passage and preventing the spread of fire.

2. A gas flame arrestor according to claim 1, characterised in that The crossbow frame (4) is fixed in the medium pipeline (1), the crossbow rod (5) is sleeved in the crossbow frame (4), one end of the crossbow rod (5) is brazed with the crossbow frame (4), the other end is fixed with the plug (7), the spring (6) is sleeved on the crossbow rod (5), and the spring (6) is arranged between the crossbow frame (4) and the plug (7), and the plug (7) is aligned with the gas nozzle (2).

3. A gas flame arrestor according to claim 2, characterised in that The crossbow frame (4) is provided with an elastic protrusion, and the crossbow frame (4) is extruded and attached to the inner wall of the medium pipeline (1) through the elastic protrusion.

4. The gas flame arrestor of claim 2, wherein The medium pipeline (1) is further provided with an auxiliary positioning structure, which is used for assisting the positioning and installation of the crossbow frame (4) in the medium pipeline (1).

5. The gas flame arrestor of claim 2, wherein The medium pipeline (1) is provided with a combustion supporting gas inlet (12) and a premixed gas outlet (11), the combustion supporting gas and the gas enter the medium pipeline (1) through the combustion supporting gas inlet (12) and the gas nozzle (2) respectively for premixing, and the mixed gas of the combustion supporting gas and the gas flows out through the premixed gas outlet (11).

6. The gas flame arrestor of claim 2, wherein The medium pipeline (1) is further provided with a guide groove, and the crossbow frame (4) is fixedly installed in the medium pipeline (1) along the guide groove.

7. The gas flame arrestor of claim 4, wherein The auxiliary positioning structure comprises a V-shaped structure and a baffle (10), the baffle (10) is fixed in the V-shaped structure, and one end of the crossbow frame (4) is arranged in the V-shaped structure and connected with the baffle (10).

8. A gas flame arrestor according to claim 7, characterised in that The V-shaped structure comprises two groups of arc-shaped protrusions (9), and the two groups of arc-shaped protrusions (9) are arranged in a V shape and fixed in the medium pipeline (1).

9. Gas flame arrestor according to any one of claims 1 to 8, characterized in that The cross-sectional area of the fire blocking crossbow (3) is smaller than the cross-sectional area of the inner wall of the medium pipeline (1).

10. A gas flame arrestor according to claim 9, characterised in that The width and the height of the two ends of the fire blocking crossbow (3) are smaller than the inner diameter of the medium pipeline (1).

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