A backfire prevention safety device for burners

Abstract

This utility model belongs to the field of burner backfire prevention technology, and provides a backfire prevention safety device for burners, including a connecting part with an internal ventilation structure; a backfire prevention component, which is detachably installed on the end of the connecting part acting on the burner, and has an internal channel structure; and a thermally conductive barrier component installed between the ventilation structure and the channel structure. The channel structure and the ventilation structure are spatially staggered to make the fluid path through the backfire prevention safety device tortuous. This utility model has high reliability in preventing backfire, effectively reduces the risk of pipeline deflagration, and is easy to install and disassemble, with low cost.

Description

Technical Field

[0001] This application relates to the field of backfire prevention technology for burners, and particularly to a backfire prevention safety device for burners. Background Technology

[0002] As a core energy conversion device in industrial production and residential heating, the safe and stable operation of gas-fired boilers is not only directly related to the reliability of the equipment itself, but also closely linked to the safety of personnel and property. During combustion, abnormal conditions such as an imbalance in the fuel-air mixture ratio, fluctuations in gas pressure, blockage of the burner nozzles, or backfire in the combustion chamber can easily lead to dangerous backfire propagation. This can cause deflagration in the fuel supply pipeline, resulting in equipment damage, production shutdowns, and even serious accidents such as explosions. According to industry statistics, over 70% of safety accidents in the gas-fired boiler field are directly related to backfire, making backfire prevention safety protection mechanisms a crucial core component in burner design.

[0003] Traditional flame arrestors, such as metal mesh flame arresters and porous ceramic filters, primarily interrupt the combustion chain through flame quenching to prevent backfire. However, these components have significant drawbacks: during long-term use, they are prone to clogging due to carbon buildup. This not only reduces ventilation efficiency and affects the normal operation of the burner, but also requires frequent disassembly and maintenance, and the cleaning process is very difficult, increasing the equipment's operation and maintenance costs and time.

[0004] Furthermore, existing technologies have continuously developed various backfire-proof safety burners. For example, patent CN210373443U discloses a backfire-proof safety burner, including a burner shell, a combustion chamber at the upper end of the burner shell, the upper end face of the burner shell mounted on the lower end face of a mounting plate, the lower end of the combustion chamber connected to the backfire-proof inner cavity, and a first conical reducer at the upper end of the backfire-proof inner cavity. This burner utilizes interleaved arc-shaped flame-retardant plates on adjacent buffer plates to block the flame after backfire, thereby preventing the flame from spreading to the air inlet. It adopts a synergistic backfire prevention approach of physical blocking and flow rate regulation. However, this technical solution is not suitable for combustion boilers. This solution results in concentrated thermal stress, and during backfire, the high-temperature flame continuously impacts the local flame-retardant plates, easily leading to deformation or damage. Boilers need to operate continuously, and blockage or local overheating may cause unplanned shutdowns. Moreover, the complex buffer structure increases airflow resistance, potentially increasing the power consumption of the induced draft fan. The complex flow channel requires high media cleanliness, is easily blocked by particulate matter, and is inconvenient for cleaning and maintenance.

[0005] Therefore, there is an urgent need for a backfire prevention safety protection mechanism for gas-fired boiler burners to solve the problems of the traditional flame arrestors, improve the safety and reliability of gas-fired boiler burners, and ensure their stable operation in industrial production and civil heating. Utility Model Content

[0006] In view of the shortcomings of the existing technology, this utility model provides a backfire prevention safety device for burners. It has high reliability in preventing backfire, can effectively reduce the risk of pipeline explosion, and is easy to install and disassemble with low cost.

[0007] To achieve the above and related objectives, this utility model provides a backfire prevention safety device for a burner, comprising: a connecting member having a ventilation structure inside; a backfire prevention component detachably installed on one end of the connecting member acting on the burner, and having a channel structure inside; and a thermally conductive barrier component installed between the ventilation structure and the channel structure, wherein the channel structure and the ventilation structure are spatially staggered to make the fluid path flowing through the backfire prevention safety device tortuous.

[0008] Furthermore, the docking component includes a first docking portion and a second docking portion fixedly connected to the first docking portion, and the ventilation structure includes a plurality of second openings penetrating the second docking portion, and the plurality of second openings are arranged in a circumferential array.

[0009] Furthermore, the thermal barrier component includes multiple metal connecting pieces arranged in a circumferential array.

[0010] Furthermore, the metal connecting piece is perpendicular to the center position of the second opening.

[0011] Furthermore, it also includes an installation cylinder, which is disposed inside the first docking portion and forms an installation groove with the first docking portion.

[0012] Furthermore, the backfire prevention component includes a connector, which is installed in the mounting slot.

[0013] Furthermore, the channel structure includes multiple first openings formed by through-connectors, and the multiple first openings are arranged in a circumferential array.

[0014] Furthermore, the diameter of the second opening is larger than the diameter of the first opening.

[0015] Furthermore, the second opening and the first opening are staggered in the vertical direction.

[0016] Furthermore, a groove is provided at one end of the connector.

[0017] The beneficial technical effects of this utility model are as follows:

[0018] This invention is applicable to gas boiler burners. Through the staggered arrangement of the channel structure and the ventilation structure, as well as the design of the thermally conductive barrier component, it can physically block the backfire propagation path of the flame, while extending the flame propagation distance and increasing heat loss. Through the triple mechanism of path extension and heat loss, physical blocking and flame quenching, and rapid cooling of the high thermal conductivity barrier component, it effectively blocks and extinguishes backfire. Compared with the backfire prevention effect of traditional single flame arrestor elements, it is more reliable and can effectively reduce the risk of pipeline explosion.

[0019] In this invention, the anti-backfire component and the connecting component are detachably connected. When carbon buildup or blockage occurs, they can be disassembled separately for cleaning or replacement without disassembling the entire burner. This solves the problem of frequent disassembly and maintenance and difficult cleaning of traditional flame arresters, reducing maintenance costs and downtime. Attached Figure Description

[0020] The accompanying drawings, incorporated in and forming part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without inventive effort. In the drawings:

[0021] Figure 1 This is a schematic diagram of an exemplary backfire prevention safety device according to this application;

[0022] Figure 2 This is a schematic diagram of another exemplary backfire prevention safety device in this application;

[0023] Figure 3 This is a cross-sectional view of the backfire prevention safety device of this application.

[0024] Figure Labels

[0025] 1: First mating part; 2: Second mating part; 3: Second opening; 4: Mounting cylinder; 5: Connector; 6: Groove; 7: First opening; 8: Metal connecting piece. Detailed Implementation

[0026] Unless otherwise defined, all technical and / or scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should be understood that certain features of this invention (described in the context of separate embodiments for clarity) may also be provided in combination in a single embodiment. Conversely, multiple features of this invention (described in the context of a single embodiment for brevity) may also be provided separately or in any suitable combination or, where appropriate, in any other described embodiment of this invention. Certain features described in the context of various embodiments will not be considered essential features of those embodiments unless the embodiment is inoperable without those elements. The present invention is further illustrated below by specific examples; however, it should be noted that the specific process conditions and results described in the embodiments of this invention are for illustrative purposes only and should not be construed as limiting the scope of protection of this invention. All equivalent changes or modifications made in accordance with the spirit and essence of this invention should be covered within the scope of protection of this invention.

[0027] like Figures 1 to 3 As shown, this application provides a backfire prevention safety device for a burner, comprising: a docking member having a ventilation structure inside; a backfire prevention component detachably installed on one end of the docking member acting on the burner, and having a channel structure inside; and a thermally conductive barrier assembly installed between the ventilation structure and the channel structure, wherein the channel structure and the ventilation structure are spatially staggered to make the fluid path flowing through the backfire prevention safety device tortuous.

[0028] Furthermore, such as Figure 1 As shown, the connecting part includes a first connecting portion 1 and a second connecting portion 2 fixedly connected to the first connecting portion 1. The ventilation structure includes multiple second openings 3 penetrating the second connecting portion 2, and the multiple second openings 3 are arranged in a circumferential array. The first connecting portion 1 is used to connect to the burner or other pipelines, the second connecting portion 2 is used to directly face the potential flashback flame, and the multiple second openings 3 are the main air inlets for the gas-air mixture, and also the first barrier against which the flashback flame attempts to propagate backward. During normal operation, the air intake of the multiple second openings 3 can form multiple fine and uniform airflows, making the gas-air mixture more uniform, which helps to achieve stable and efficient combustion at the burner end. In the event of flashback, the flame is broken down into multiple fine flames, which enter each second opening 3 respectively. This increases the contact area between the flame and the orifice wall, accelerates heat dissipation, and thus suppresses the further development of flashback in the early stages. The circumferential array arrangement can better maintain the structural integrity of the end face, and has stronger resistance to pressure and deformation.

[0029] Furthermore, such as Figure 3As shown, the thermal barrier component of this application includes multiple metal connecting pieces 8 arranged in a circumferential array. The metal connecting pieces 8 are perpendicularly positioned to the center of the second opening 3. The metal connecting pieces 8 of this application have high thermal conductivity. When they are perpendicularly aligned with the center of the second opening 3, they are directly exposed to the high-temperature flame attempting to propagate in the opposite direction. Due to the excellent thermal conductivity of metals (especially high thermal conductivity materials such as copper and aluminum alloys), the heat of the flame is rapidly absorbed by the metal connecting pieces 8. After the heat is absorbed by the metal connecting pieces 8, it is rapidly dispersed to the entire thermal barrier component and even the mating parts through thermal conduction, and finally dissipated into the surrounding environment. This continuous process of heat absorption and dissipation can rapidly reduce the temperature of the flame front. In addition, the metal connecting pieces 8 are perpendicularly and precisely aligned with the center of the second opening 3, forming a physical barrier. The flame cannot pass through in a straight line and must bypass the edge of the metal connecting pieces 8. This forces the flame streamline to bend and generate vortices, greatly increasing the resistance to flame propagation. Turbulence accelerates the exchange of heat between the flame and the surrounding environment and may also break the continuous reaction zone of the flame. Furthermore, this application features multiple metal connecting pieces 8 arranged in a circumferential array, each corresponding one-to-one with the second opening 3 in the circumferential array. This ensures that regardless of the direction of backfire, a corresponding metal connecting piece 8 is available to block and dissipate heat, guaranteeing the uniformity and reliability of the protection. During normal burner operation, this multi-channel, circumferential design, compared to a single central block, provides sufficient flame-retardant area while offering a larger flow cross-sectional area for the gas mixture, thereby reducing airflow resistance and contributing to the normal operation and efficiency of the burner.

[0030] Furthermore, such as Figure 2 As shown, this application also includes an installation cylinder 4, which is disposed inside the first docking portion 1 and forms an installation groove with the first docking portion 1. The backfire prevention component includes a connector 5, which is installed in the installation groove by means of a threaded connection, forming a modular assembly structure. The channel structure includes multiple first openings 7 that penetrate the connector 5, and the multiple first openings 7 are arranged in a circumferential array. In this application, the connector 5 is connected to the installation cylinder 4 by threads and can be disassembled separately. When the first opening 7 or the metal connecting piece 8 is blocked by carbon deposits, it is not necessary to disassemble the entire docking component. Only the connector 5 needs to be unscrewed for cleaning or replacement, avoiding the risk of gas leakage caused by the overall disassembly of traditional flame arresters, while maintaining the long-term unobstructed ventilation structure.

[0031] Furthermore, the diameter of the second opening 3 in this application is larger than the diameter of the first opening 7. The second opening 3 and the first opening 7 are staggered in the vertical direction. The staggered arrangement of the first opening 7 and the second opening 3 with different diameters in this application forces the airflow and flame to not pass in a straight line, but to follow a tortuous fluid path. This significantly increases the actual distance the flame travels backward from the flashback point to the safe side. The longer path means that the flame has more time to exchange heat with the surrounding metal components, thereby dissipating heat and cooling down. Moreover, when the gas mixture flows from the larger diameter second opening 3 to the smaller diameter first opening 7, the flow velocity increases. When flashback occurs, the flame propagates backward and suddenly enters the large space from the first opening 7, the flow velocity drops sharply, and it collides violently with the metal connecting piece 8, which greatly promotes the dissipation of flame heat. When the airflow passes through the cavity between the first opening 7 and the second opening 3, strong eddies and turbulence are generated due to the rapid change in the flow channel cross-section. Turbulence tears apart the continuous reaction zone of the flame and greatly increases the contact area between the flame and the cooling wall, thus drastically accelerating the cooling and quenching of the flame. Furthermore, the large-diameter second opening 3 provides space and a functional position for the high thermal conductivity metal connecting plates 8 vertically positioned at its entrance. When the backfire flame bursts out from the first opening 7 and attempts to enter the second opening 3, it will directly impact these metal connecting plates 8, instantly absorbing and dissipating a large amount of heat from the flame, causing the flame temperature to rapidly drop below its ignition point and extinguish. The large-diameter second opening 3 ensures sufficient space for arranging the metal connecting plates 8 with an effective heat dissipation area.

[0032] Furthermore, a groove 6 is provided at one end of the connector 5. The groove 6 in this application is used to provide a dedicated tool interface to achieve safe and convenient maintenance.

[0033] Furthermore, the device described in this application is applicable to combustion boiler burners.

[0034] Furthermore, during normal burner operation, the gas mixture needs to flow smoothly towards the burner. In this case, the device of this application serves as a highly efficient and low-resistance channel, with the gas mixture flowing sequentially through the external gas source, the second opening 3, the gap between the metal connecting pieces 8, the first opening 7, and the burner.

[0035] Furthermore, when backfire unexpectedly occurs in the burner, the reverse propagation path of the flame is sequentially: burner, first opening 7, gap between metal connecting plates 8, second opening 3, and metal connecting plate 8. When the flame exits the outlet of the second opening 3, it is directly blocked by the metal connecting plate 8, which is perpendicular to the center of the second opening 3. This forces the flame to change direction, causing reflection and diversion, disrupting the stability of the flame front and preventing its continued propagation. When the high-temperature flame contacts the metal connecting plate 8, the heat is instantly absorbed by the connecting plate. This heat is then rapidly dispersed throughout the metal shell of the mating component through thermal conduction, and finally dissipated into the surrounding air.

[0036] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A flashback guard for a burner, characterized in that include: The docking component has an internal ventilation structure; A backfire prevention component is detachably installed on one end of the docking member that acts on the burner, and has an internal channel structure. A thermally conductive barrier assembly is installed between the venting structure and the channel structure, wherein the channel structure and the venting structure are spatially staggered to make the fluid path through the backfire prevention safety device tortuous.

2. The anti-reverse safety according to claim 1, wherein, The docking component includes a first docking part (1) and a second docking part (2) fixedly connected to the first docking part (1). The ventilation structure includes a plurality of second openings (3) penetrating the second docking part (2), and the plurality of second openings (3) are arranged in a circumferential array.

3. The anti-reverse safety according to claim 2, wherein, The thermally conductive barrier component includes multiple metal connecting pieces (8) arranged in a circumferential array.

4. The backfire prevention safety device according to claim 3, characterized in that, The metal connecting piece (8) is perpendicular to the middle position of the second opening (3).

5. The backfire prevention safety device according to claim 2, characterized in that, It also includes an installation cylinder (4), which is disposed inside the first docking part (1) and forms an installation groove with the first docking part (1).

6. The backfire prevention safety device according to claim 5, characterized in that, The backfire prevention component includes a connector (5), which is installed in the mounting slot.

7. The backfire prevention safety device according to claim 6, characterized in that, The channel structure includes multiple first openings (7) through the connector (5), and the multiple first openings (7) are arranged in a circular array.

8. The backfire prevention safety device according to claim 7, characterized in that, The diameter of the second opening (3) is greater than the diameter of the first opening (7).

9. The backfire prevention safety device according to claim 7, characterized in that, The second opening (3) and the first opening (7) are staggered in the vertical direction.

10. The backfire prevention safety device according to claim 6, characterized in that, One end of the connector (5) is provided with a groove (6).

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