Flame arrester

Abstract

A flame arrester, relating to the technical field of torpedo ladle baking. The flame arrester comprises a medium pipe (1), wherein a gas nozzle (2) is arranged in the medium pipe (1); a flame-arresting spring (3) is further arranged in the medium pipe (1), the cross-sectional area of the flame-arresting spring (3) being smaller than the cross-sectional area of an inner wall of the medium pipe (1). The flame-arresting spring (3) comprises a spring frame (4), a spring rod (5), a spring (6), and a plug (7), wherein the spring frame (4) is fixed in the medium pipe (1); the spring rod (5) is sleeved in the spring frame (4); one end of the spring rod (5) is brazed with the spring frame (4), and the other end of the spring rod (5) is fixed to the plug (7); the spring (6) is sleeved on the spring rod (5); the spring (6) is arranged between the spring frame (4) and the plug (7); the plug (7) is directly aligned with the gas nozzle (2); and the spring rod (5), the plug (7), and the gas nozzle (2) are coaxially arranged. The flame arrester provided herein can effectively stop flame propagation, and also basically does not increase system resistance and does not affect the normal flow and pressure of a piping system. The flame arrester has a simple structure and involves a convenient and fast mounting and maintenance process, thereby greatly reducing manufacturing, use and maintenance costs.

Description

A flame arrester TECHNICAL FIELD

[0001] The utility model relates to torpedo can baking technical field especially relates to a flame arrester. BACKGROUND

[0002] The principle of the flame arrester in the existing torpedo can baking assembly is mainly based on the phenomenon that the flame is extinguished due to heat loss when passing through narrow aperture or channel. Specifically, the flame arrester is usually composed of many small, uniform or non-uniform channels or apertures, and the size of these channels or apertures is designed to be as small as possible so as to only allow the flame to pass through; when the flame enters the flame arrester, it is divided into many small flame streams; due to the large heat transfer area of these channels or apertures, heat exchange occurs when the flame passes through the channel wall, resulting in a significant temperature drop; 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 aperture channels, while preventing the propagation 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 utility model provides a kind of flame arrester, can effectively prevent the propagation of flame at the same time, substantially do not increase system resistance, do not affect the normal flow and pressure of pipeline system, structure is simple, installation maintenance process is convenient and fast, greatly reduce manufacturing, use and maintenance cost.

[0005] To achieve the above object, the embodiments of the utility model adopt the following technical solutions:

[0006] A flame arrester, comprising a medium pipeline, a gas nozzle is arranged in the medium pipeline, and a flame arrester bow is also arranged in the medium pipeline, the cross-sectional area of the flame arrester bow is smaller than the cross-sectional area of the inner wall of the medium pipeline, the flame arrester bow comprises a bow holder, a bow rod, a spring and a plug, 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 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, the plug is aligned with the gas nozzle, and the bow rod, the plug and the gas nozzle are coaxially arranged.

[0007] According to one aspect of the utility model, the width and the height of the two ends of the flame arrester bow are smaller than the inner diameter of the medium pipeline.

[0008] According to one aspect of the utility model, elastic protrusions and through holes are arranged on the bow holder, the bow holder is extruded and attached to the inner wall of the medium pipeline through the elastic protrusions, the bow rod is inserted into the through hole, and the through hole, the bow rod, the plug and the gas nozzle are coaxially arranged.

[0009] According to one aspect of the utility model, the elastic bow frame includes upper frame plate, lower frame plate, end plate, left reinforcing plate, right reinforcing plate, the upper frame plate, lower frame plate parallelly arranged, the end plate both ends are fixed with upper frame plate end, lower frame plate end part, left reinforcing plate, right reinforcing plate are all fixed between upper frame plate, lower frame plate, and end plate, left reinforcing plate, right reinforcing plate are spaced apart.

[0010] According to one aspect of the utility model, the elastic convex is arranged on the upper frame plate and the lower frame plate respectively, and the through hole sequentially penetrates the end plate, the left reinforcing plate and the right reinforcing plate from left to right.

[0011] According to one aspect of the utility model, the auxiliary positioning structure is further arranged in the medium pipeline, the auxiliary positioning structure includes a V-shaped structure and a baffle, the baffle is fixed in the V-shaped structure, and one end of the elastic bow frame is arranged in the V-shaped structure and connected with the baffle.

[0012] According to one aspect of the utility model, the V-shaped structure includes two groups of arc-shaped protrusions, the two groups of arc-shaped protrusions are arranged in a V-shaped manner in the medium pipeline, and the baffle is fixed between the two groups of arc-shaped protrusions.

[0013] According to one aspect of the utility model, the medium pipeline is communicated with a combustion gas inlet and a premixed gas outlet at two ends respectively, and the gas nozzle is communicated with the combustion gas inlet at one end.

[0014] According to one aspect of the utility model, the medium pipeline is further provided with a guide groove, and the elastic bow frame enters the medium pipeline along the guide groove and is fixed and installed.

[0015] According to one aspect of the utility model, the medium pipeline is a circular pipe, the gas nozzle is in an L shape, the elastic bow frame is a square frame, the elastic bow rod is a circular rod, the plug is in a hemispherical shape, and the guide groove is in a U shape.

[0016] The utility model discloses the advantages of implementation: when the medium pipeline is backfire, the brazing position between the bowstring and the bow frame is heated and fused, and then the spring pushes the bowstring to extend relative to the bow frame, so that the plug blocks the gas nozzle, thereby closing the gas passage and preventing the flame from spreading. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the following will introduce the drawing needed to be used in the embodiment, obviously, the drawing in the following description only is some embodiments of the utility model, for the ordinary skilled person in the art, under the premise of not paying the creative labor, still can obtain other drawings according to these drawings.

[0018] Fig. 1 is the perspective structure schematic diagram of the utility model;

[0019] Fig. 2 is the sectional structure schematic diagram of the utility model;

[0020] Fig. 3 is the sectional structure schematic diagram of the utility model;

[0021] Fig. 4 is the structure schematic diagram of the firestop bow of the utility model.

[0022] The name corresponding to the serial number in the drawing is as follows:

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

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of the present application. In the description of the present application, it should be noted that the positions or location 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 the positions or location relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the present application.

[0025] Embodiment one

[0026] As shown in FIGS. 1-4, a fire arrester is installed in a torpedo can roaster or used in any roasting device; the fire arrester comprises a medium pipeline 1, a gas nozzle 2 and a fire arrester bow 3. The medium pipeline 1 is a circular tube, and the left and right ends thereof 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 fuel gas; the combustion-supporting gas and the fuel 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 fuel 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 integrally provided with a gas inlet 21 at the end thereof, the gas inlet 21 penetrates the medium pipeline 1 vertically and integrally, and 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 gas outlet end of the gas nozzle 2 is in a semispherical shape; the fuel gas enters the gas inlet 21 and then flows into the medium pipeline 1 through the gas nozzle 2. The fire arrester bow 3 is fixed in the medium pipeline 1 and used for blocking the fuel gas delivery; the fire arrester bow 3 comprises a bow holder 4, a bow rod 5, a spring 6 and a plug 7, wherein 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 and the other end thereof 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 melted by heat, 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 fuel gas channel and preventing the flame from spreading.

[0027] In the embodiment, the cross-sectional area of the whole fire blocking 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 fire blocking 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 fire blocker (blocking the whole pipeline and leaving only a few small holes or passages for the flame to pass through), the fire blocking bow 3 does not hinder the circulation of the gas in the medium pipeline 1 when the product is normally working, that is, it 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 elastic protrusions are arranged at the middle positions 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, that is, the bow holder 4 is fixedly installed in the medium pipeline 1.

[0029] In the embodiment, the bow holder 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 the shape of a square plate. 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 protruding and elastic, or 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 the shape of a flat plate, and the middle positions are in the shape of a V-shaped plate or an arc-shaped plate. The bow holder 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 the shape of a round rod and is inserted into the through hole. The bow rod 5, the plug 7, the through hole, and the gas nozzle 2 are coaxial, and the manufacturing precision is strictly controlled to avoid tight closing. The left end of the bow rod 5 is welded with the end plate 43 through the 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 and the height of the left and right ends of the bow holder 4 are both smaller than the inner diameter of the medium pipeline 1, so that it is convenient to insert or extract the bow holder 4 into or out of the medium pipeline 1 and convenient to disassemble and assemble. The square frame structure of the bow holder 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 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 in an upper and lower manner, and 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 fireproofing bow 3, and the baffle 10 is used for limiting the installation depth of the fireproofing 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 connected with the baffle 10 in a contact manner. The V-shaped structure includes two groups of arc-shaped protrusions 9, which are in a semicylindrical shape and 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 fireproofing bow 3 is installed in the middle of the medium pipeline 1 in an installation orientation, and also ensure that the fireproofing 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 installation of the entire fireproofing bow 3 in the medium pipeline 1).

[0031] In the embodiment, the plug 7 is in a semispherical shape, which is matched with the structure shape of the gas nozzle 2 in an outlet end, so as to facilitate the plugging of the plug 7 to the gas nozzle 2. The spherical surface structure of the plug 7 can make the sealing more tight. The bow frame 4 and the bow rod 5 are used as a brazing base material, and are made of stainless steel 304, with a melting point temperature of about 1400℃. The brazing material 8 is made of silver-based brazing material 8, with a melting point temperature of 600-800℃, so as to ensure the welding strength between the left end of the bow rod 5 and the end plate 43 of the bow frame 4, and firmly connect them without 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 fireproofing bow 3 can quickly act to realize the fireproofing function and protect other equipment from being affected. The selection of the brazing material 8 should be matched with the normal working temperature and the mixed gas combustion flame temperature, so as to ensure the structural stability during normal working and 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 fireproofing 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 bow rod 5 and the bow frame 4 is heated and melted, the connection between the left end of the bow rod 5 and the bow frame 4 is disconnected, and then the compressed spring 6 returns to the free stretching state to push the bow rod 5 to pop out relative to the bow frame 4, so that the plug 7 at the right end of the bow rod 5 plugs the gas nozzle 2, and the two form a perfect spherical surface sealing, so as to close the gas passage and prevent the flame from spreading.

[0033] 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 and the elastic protrusion, that is, the flame arrester bow 3 and the external medium pipeline 1 are connected through simple mechanical cooperation. 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 during backfire. The external equipment is not damaged, and the new flame arrester bow 3 can be easily replaced during maintenance. 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] A flame arrester is installed in a torpedo tank roaster or used in any roasting device; the flame arrester comprises a medium pipeline 1, a gas nozzle 2, and a flame arrester bow 3. The medium pipeline 1 is a circular pipe, 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 for fuel gas and combustion-supporting gas; the combustion-supporting gas and the fuel gas are respectively mixed by passing through the combustion-supporting gas inlet 12 and the fuel gas nozzle 2 into the medium pipeline 1, and the mixed gas of the combustion-supporting gas and the fuel gas flows out through the premixed gas outlet 11. The fuel gas nozzle 2 extends into the medium pipeline 1, and the fuel gas nozzle 2 is used as a combustible gas injection outlet. The fuel gas nozzle 2 and the combustion-supporting gas inlet 12 are both located at the right end of the medium pipeline 1. The fuel gas nozzle 2 is integrally provided with a fuel gas inlet 21 at the end thereof, and the fuel gas inlet 21 vertically penetrates the medium pipeline 1. The fuel gas inlet 21 is used as a combustible gas inlet connection port. The overall structure of the fuel gas nozzle 2 is L-shaped, and the outlet end of the fuel gas nozzle 2 is hemispherical. The fuel gas enters the fuel gas inlet 21 and then flows into the medium pipeline 1 through the fuel gas nozzle 2. The flame arrester bow 3 is fixed in the medium pipeline 1 and is used for blocking the fuel gas. 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 fuel gas nozzle 2. In the normal state, that is, 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 melted by heat, 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 fuel gas nozzle 2, thereby closing the fuel gas channel and preventing flame propagation.

[0036] In the embodiment, the cross-sectional area of the whole fire damper 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 fire damper bow 3 are both smaller than the inner diameter of the medium pipeline 1. In this way, compared with the structural arrangement of the traditional pipeline fire damper (blocking the whole pipeline, leaving only a few small holes or passages for the flame to pass through), the fire damper bow 3 does not hinder the circulation of the gas in the medium pipeline 1 when the product is normally working, that is, it does not increase the system resistance and does not affect the normal flow and pressure of the pipeline system.

[0037] In the embodiment, the elastic protrusions are arranged at the middle positions 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, that is, the bow holder 4 is fixedly installed in the medium pipeline 1.

[0038] In the embodiment, the bow holder 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 the shape of a square plate; 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 strengthening the structure. The middle positions of the upper frame plate 41 and the lower frame plate 42 are outwardly protruding and elastic, or 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 the shape of a flat plate, and the middle positions are in the shape of a V-shaped plate or an arc-shaped plate. The bow holder 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 the shape of a round rod and is inserted into the through hole; the bow rod 5, the plug 7, the through hole, and the gas nozzle 2 are coaxial, and the manufacturing precision is strictly controlled to avoid tight closing. The left end of the bow rod 5 is welded with the end plate 43 through the 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 and the height of the left and right ends of the bow holder 4 are both smaller than the inner diameter of the medium pipeline 1, so that it is convenient to insert or extract the bow holder 4 into or out of the medium pipeline 1 and convenient to disassemble and assemble; the square frame structure of the bow holder 4 is simple in structure and easy to manufacture and process.

[0039] In the embodiment, the auxiliary positioning structure is arranged in the medium pipeline 1 and is used for assisting positioning and installation of the arch 4 in the medium pipeline 1. The auxiliary positioning structure has two groups, which are fixed in the medium pipeline 1 in an upper and lower manner, and 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 arch 3, and the baffle 10 is used for limiting the installation depth of the arch 3. The baffle 10 is fixed in the V-shaped structure, and the right end of the arch 4 is arranged in the V-shaped structure and is connected with the baffle 10. The V-shaped structure includes two groups of arc-shaped protrusions 9, which are arranged in a V-shaped manner and are fixed in the medium pipeline 1 in a semicylindrical shape. 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 arch 3 is installed in the middle of the medium pipeline 1 in the installation direction and the arch 3 or the plug 7 is aligned with the gas nozzle 2), and are in contact with the baffle 10 (so as to limit the height or depth of the entire arch 3 in the medium pipeline 1). The baffle 10 can abut against the right end surfaces of the upper and lower frame plates, thereby limiting the position.

[0040] In the embodiment, the plug 7 is semispherical, and the structure shape thereof is matched with the structure shape of the gas nozzle 2. In this way, the plug 7 can be used to plug the gas nozzle 2. The spherical surface structure of the plug 7 can make the sealing more tight. The arch 4 and the arch rod 5 are made of stainless steel 304, which is used as a brazing base material and has a melting point temperature of about 1400°C. The brazing material 8 is made of silver-based brazing material 8, and the melting point temperature thereof is selected to be 600-800°C. In this way, the welding strength between the left end of the arch rod 5 and the end plate 43 of the arch 4 can be ensured, and the arch rod 5 can be firmly connected without tempering. When tempering occurs, the flame temperature is much higher than the melting point temperature of the welding material, so that the arch 3 can quickly act to realize the fireproof function and protect other equipment. The selection of the brazing material 8 should be matched with 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 and melting of the mixed gas during 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 arch 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 further arranged in the medium pipeline 1, and the crossbow frame 4 is fixedly installed in the medium pipeline 1 along the guide groove. The guide groove is a U-shaped groove and has two groups symmetrically arranged at upper and lower positions in the middle of the medium pipeline 1. The guide groove extends from the left end of the medium pipeline 1 to the front of the auxiliary positioning structure. The crossbow frame 4 (or the whole firestop 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 assembly of the firestop crossbow 3, but also plays an auxiliary role in the installation and positioning of the firestop crossbow 3.

[0042] The principle of the embodiment is that when backfire occurs in the medium pipeline 1, the brazing position between the crossbow rod 5 and the crossbow frame 4 is heated and melted, the connection between the left end of the crossbow rod 5 and the crossbow frame 4 is disconnected, and then the compressed spring 6 returns to the free stretching state and pushes the crossbow rod 5 out relative to the crossbow frame 4, so that the plug 7 at the right end of the crossbow rod 5 blocks the gas nozzle 2, and the two form a perfect spherical surface seal, thereby closing the gas passage and preventing the spread of the flame.

[0043] The beneficial effects of the embodiment are that the product can effectively prevent the spread of the flame while basically not increasing the system resistance and not affecting the normal flow and pressure of the pipeline system, compared with the existing firestop device. Since the cross-sectional area of the firestop crossbow 3 is smaller than that 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 crossbow frame 4 is pressed and fitted with the inner wall of the medium pipeline 1 through the elastic protrusion, that is, the firestop crossbow 3 is connected with the external medium pipeline 1 through simple mechanical cooperation, and the installation and maintenance process of the product is convenient and fast. The firestop crossbow 3 of the product is a disposable device, and only the firestop crossbow 3 is damaged during backfire, and the external device is not damaged. When overhauled, a new firestop crossbow 3 can be conveniently replaced, and the external pipeline can continue to be used, greatly reducing 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 merely describes the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection 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 flame arrester comprising a medium conduit (1) in which a gas nozzle (2) is arranged, characterized in that The medium pipeline (1) is further provided with a fireproof bow (3), the cross-sectional area of the fireproof bow (3) is smaller than the cross-sectional area of the inner wall of the medium pipeline (1), the fireproof bow (3) comprises a bow frame (4), a bow rod (5), a spring (6) and a plug (7), the bow frame (4) is fixed in the medium pipeline (1), the bow rod (5) is sleeved in the bow frame (4), one end of the bow rod (5) is brazed with the bow frame (4), the other end is fixed with the plug (7), the spring (6) is sleeved on the bow rod (5), the spring (6) is arranged between the bow frame (4) and the plug (7), the plug (7) is opposite to the gas nozzle (2), the bow rod (5), the plug (7) and the gas nozzle (2) are coaxially arranged.

2. The flame arrestor of claim 1, wherein The width and the height of the two ends of the fireproof bow (3) are smaller than the inner diameter of the medium pipeline (1).

3. The flame arrestor of claim 2, wherein, The bow frame (4) is provided with elastic protrusions and through holes, the bow frame (4) is extruded and attached to the inner wall of the medium pipeline (1) through the elastic protrusions, the bow rod (5) is inserted into the through hole, and the through hole, the bow rod (5), the plug (7) and the gas nozzle (2) are coaxially arranged.

4. The flame arrestor of claim 3, wherein The bow frame (4) comprises 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), the upper frame plate (41) and the lower frame plate (42) are arranged in parallel, the end plate (43) is fixed at the ends of the upper frame plate (41) and the lower frame plate (42), and the left reinforcing plate (44) and the right reinforcing plate (45) are fixed between the upper frame plate (41) and the lower frame plate (42).

5. The flame arrestor of claim 4, wherein, The elastic protrusions are arranged on the upper frame plate (41) and the lower frame plate (42), and the through hole penetrates the end plate (43), the left reinforcing plate (44) and the right reinforcing plate (45) from left to right.

6. The flame arrestor of claim 1, wherein The medium pipeline (1) is further provided with an auxiliary positioning structure, 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 bow frame (4) is arranged in the V-shaped structure and connected with the baffle (10).

7. The flame arrestor of claim 6, wherein The V-shaped structure comprises two groups of arc protrusions (9), the two groups of arc protrusions (9) are arranged in a V shape and fixed in the medium pipeline (1), and the baffle (10) is fixed between the two groups of arc protrusions (9).

8. The flame arrestor of claim 1, wherein The medium pipeline (1) is further provided with a combustion-supporting gas inlet (12) and a premixed gas outlet (11) which are communicated with the two ends of the medium pipeline (1) respectively, and the gas nozzle (2) is provided with a gas inlet (21) at one end.

9. The flame arrestor of claim 1, wherein The medium pipeline (1) is further provided with a guide groove, and the bow frame (4) enters the medium pipeline (1) along the guide groove and is fixed and installed.

10. The flame arrestor of claim 9, wherein, The medium pipeline (1) is a circular pipe, the gas nozzle (2) is L-shaped, the bow frame (4) is a square frame, the bow rod (5) is a circular rod, the plug (7) is hemispherical, and the guide groove is U-shaped.

Images