A flame arrester

Abstract

The present invention discloses a flame arrester, comprising: an outer tube, an inner tube, and a flame arrester core. The outer tube wraps around the inner tube, and the outer tube is connected to the inner tube. The flame arrester core is housed in the inner tube. The outer tube is partially arranged indoors and partially arranged outdoors. The inner tube is partially arranged indoors and partially arranged outdoors. The tail gas inlet of the outer tube is located indoors. The flame arrester of the present invention is a double-layer structure comprising an outer tube and an inner tube, and is partially arranged indoors and partially arranged outdoors. The indoor tail gas passes through the outer cavity to preheat the inner cavity, while condensing the moisture in the tail gas, thereby preventing ice from forming from two perspectives: reducing the water content in the tail gas and preheating the inner cavity. Therefore, the design of the double-layer structure allows the temperature of the inner cavity where the flame arrester core is located to be maintained above a certain temperature, and the water content of the tail gas passing through is relatively low. The present invention utilizes the sensible heat of the tail gas itself, does not add other heat sources, does not introduce redundant equipment or complex structures, has low cost, and is safer.

Description

Technical Field

[0001] The present invention relates to the technical field related to gas emission, in particular to a flame arrester. Background Art

[0002] A flame arrester generally consists of a flame arrester core, a flame arrester housing, and accessories. Its primary function is to prevent the spread of flammable gas and liquid vapor flames in pipelines. The flame arrester core is the primary structure that prevents the spread of flames. Commonly used flame arrester cores include metal mesh and corrugated cores. Currently, there are two common theories in academia regarding the working principles of flame arresters: heat transfer and the wall effect. The flame arrester core contains numerous small channels. When a flame passes through these channels, it is broken into several smaller flames. This increases the contact area between the small flames and the channel walls, enhancing heat transfer and lowering the flame temperature below the ignition point, thereby preventing the flame from spreading. When burning combustible gas passes through the small channels of the flame arrester core, the probability of free radicals colliding with the channel walls increases, reducing the number of free radicals participating in the reaction. When the channels of the flame arrester core narrow enough, collisions between free radicals and the channel walls become dominant. Due to the sharp decrease in the number of free radicals, the reaction cannot proceed, and the combustion reaction cannot continue through the flame arrester.

[0003] However, for the vent flame arresters installed on the roofs of laboratories and factories, due to the great randomness and uncertainty in conducting scientific research experiments in laboratories and factories, the physical and chemical properties of the discharged gases are also quite different. When encountering a low temperature environment, the water vapor contained in the vent gas is easy to condense at the flame arrester core, blocking the small channels of the flame arrester core, thereby causing ice blockage of the flame arrester, and thus causing the entire vent pipeline to be blocked, unable to vent in time, affecting the operation of each experimental device and causing safety problems.

[0004] To this end, the prior art proposes to prevent the flame arrester core from freezing by electrically heating the outer layer and the inner layer of the flame arrester or heating the flame arrester using a gas station compressor.

[0005] The method of electrically heating the outer and inner layers of a flame arrester requires wrapping a self-regulating electric heating cable around the outside of the flame arrester, as well as a temperature detector for detecting the temperature at the flame arrester outlet. The flame arrester is heated by the self-regulating electric heating cable until it reaches the set value, and then heating is stopped to maintain the flame arrester within a certain temperature range. Using electric heating to insulate flame arresters is a common method, but the flame arrester outlet is surrounded by flammable and explosive gases or vapors. The electric heating cable and cables age over time, and there is a risk of short circuits, leakage, and other sparks. Once the sparks ignite the flammable gases or vapors, they can cause serious safety accidents such as fires and explosions.

[0006] The method of using the gas station compressor for heating requires the use of the heat of the compressor, which requires more modifications to the original heat exchange system of the compressor. After the modification, the overall structure is relatively complex and the cost is high. Summary of the Invention

[0007] Based on this, it is necessary to provide a flame arrester to address the technical problems of the existing technology that the cost of preventing the fire-retardant core from freezing is too high and it is easy to cause serious safety accidents such as fire and explosion.

[0008] The present invention provides a flame arrester, comprising: an outer tube, an inner tube, and a fire arrester core, wherein the outer tube wraps the inner tube and is communicated with the inner tube, the fire arrester core is accommodated in the inner tube, the outer tube is partially arranged indoors and partially arranged outdoors, the inner tube is partially arranged indoors and partially arranged outdoors, and the exhaust gas inlet of the outer tube is located indoors.

[0009] Furthermore, there is an outer cavity between the outer tube and the inner tube, the internal cavity of the inner tube is the inner cavity, the fire-retardant core is fixed in the inner cavity, the outer tube includes an indoor and outdoor cavity exhaust gas inlet located indoors and an outdoor outdoor cavity exhaust gas outlet located outdoors, the indoor and outdoor cavity exhaust gas inlet and the outdoor outdoor cavity exhaust gas outlet are respectively connected to the outer cavity, the inner tube includes an indoor cavity exhaust gas inlet located indoors and an outdoor cavity exhaust gas outlet located outdoors, the indoor cavity exhaust gas inlet and the outdoor cavity exhaust gas outlet are respectively connected to the inner cavity, and the outdoor cavity exhaust gas outlet is connected to the indoor cavity exhaust inlet.

[0010] Furthermore, the cross-sectional area of ​​the exhaust gas inlet of the indoor and outdoor cavities is smaller than the cross-sectional area of ​​the outdoor cavity.

[0011] Furthermore, the indoor and outdoor cavity exhaust gas inlet is located at the lower part of the outer tube, the outdoor outer cavity exhaust gas outlet is located at the upper part of the outer tube, the inner tube is arranged from top to bottom, and the indoor and outdoor cavity exhaust gas inlet is located at the lower part of the inner tube, and the outdoor inner cavity exhaust gas outlet is located at the upper part of the inner tube.

[0012] Furthermore, the outdoor outer cavity exhaust gas outlet is connected to the indoor inner cavity exhaust gas inlet through a connecting pipe, and the connecting pipe is partially arranged outdoors and partially arranged indoors.

[0013] Furthermore, the fire-blocking core is located on the outdoor side.

[0014] Furthermore, it also includes a first drain valve arranged at the bottom of the outer tube.

[0015] Furthermore, the outer tube includes an outer tube upper portion and an outer tube lower portion that are fixedly connected, and the inner tube includes an inner tube upper portion and an inner tube lower portion that are fixedly connected.

[0016] Furthermore, the fire-retardant core is fixed at the connection between the upper portion of the inner tube and the lower portion of the inner tube.

[0017] Furthermore, a sealing ring is provided at the connection between the upper portion of the outer tube and the lower portion of the outer tube, and a sealing ring is provided at the connection between the upper portion of the inner tube and the lower portion of the inner tube.

[0018] The flame arrester of the present invention is a double-layer structure including an outer tube and an inner tube, with one portion arranged indoors and the other portion arranged outdoors. The indoor exhaust gas passes through the outer cavity to preheat the inner cavity, while condensing the moisture in the exhaust gas, thereby preventing ice formation from two perspectives: reducing the water content in the exhaust gas and preheating the inner cavity. Therefore, the design of the double-layer structure allows the temperature of the inner cavity where the flame arrester core is located to be maintained above a certain temperature, and the moisture content of the exhaust gas passing through is low. Compared with traditional electric heating or the use of condensed water from a nearby compressor as a heat source, the present invention utilizes the sensible heat of the exhaust gas itself, does not add other heat sources, does not introduce redundant equipment or complex structures, is low in cost, and is safer. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a structural schematic diagram of a flame arrester according to the present invention;

[0020] Figure 2 The figure is a structural diagram of a flame arrester according to an embodiment of the present invention.

[0021] Marking Description

[0022] 1-outer pipe; 11-indoor and outdoor cavity exhaust gas inlet; 12-outdoor outdoor cavity exhaust gas outlet; 13-upper part of outer pipe; 14-lower part of outer pipe; 2-inner pipe; 21-indoor and outdoor cavity exhaust gas inlet; 22-outdoor indoor cavity exhaust gas outlet; 23-upper part of inner pipe; 24-lower part of inner pipe; 3-fire arrester core; 4-first drain valve; 5-fastening bolts; 6-gasket; 7-flange; 8-connecting pipe; 9-second drain valve. DETAILED DESCRIPTION

[0023] The following further describes specific embodiments of the present invention with reference to the accompanying drawings. Like components are denoted by like reference numerals. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inward" and "outward" refer to directions toward or away from the geometric center of a particular component, respectively.

[0024] like Figure 1The figure shows a structural schematic diagram of a flame arrester of the present invention, comprising: an outer tube 1, an inner tube 2, and a fire arrester core 3. The outer tube 1 wraps the inner tube 2, and the outer tube 1 is connected to the inner tube 2. The fire arrester core 3 is accommodated in the inner tube 2. The outer tube 1 is partially arranged indoors and partially arranged outdoors. The inner tube 2 is partially arranged indoors and partially arranged outdoors. The exhaust inlet of the outer tube 1 is located indoors.

[0025] Specifically, flame arrester of the present invention is mainly used in laboratories and factory building roofs. The core part of this flame arrester is a double-layer structure, with an inner tube 2 as an exhaust pipe and a fire-retardant core 3 accommodated in the inner tube 2. The outer layer is an outer tube 1, which wraps the inner tube 2. Exhaust gas enters from the outer tube 1 and is then discharged from the inner tube 2 after passing through the fire-retardant core 3, thereby achieving the purpose of fire arresting. The flame arrester as a whole is placed on the interface between the laboratory (experimental plant) and the outdoors, i.e., partly indoors and partly outdoors. Even in cold seasons, due to measures such as heating and insulation, the minimum temperature of the room temperature remains at more than 5 degrees Celsius. When exhaust gas enters the outer tube 1, the exhaust gas wraps around the inner tube 2, and the sensible heat of the exhaust gas plays a preheating effect on the inner tube 2, preventing the low-temperature air of the external environment from directly contacting the internal pipeline, and ensuring that the inner tube 2 remains at more than a certain temperature, thereby avoiding freezing and blocking the fire-retardant core 3.

[0026] The flame arrester of the present invention is a double-layer structure including an outer tube and an inner tube, with one portion arranged indoors and the other portion arranged outdoors. The indoor exhaust gas passes through the outer cavity to preheat the inner cavity, while condensing the moisture in the exhaust gas, thereby preventing ice formation from two perspectives: reducing the water content in the exhaust gas and preheating the inner cavity. Therefore, the design of the double-layer structure allows the temperature of the inner cavity where the flame arrester core is located to be maintained above a certain temperature, and the moisture content of the exhaust gas passing through is low. Compared with traditional electric heating or the use of condensed water from a nearby compressor as a heat source, the present invention utilizes the sensible heat of the exhaust gas itself, does not add other heat sources, does not introduce redundant equipment or complex structures, is low in cost, and is safer.

[0027] like Figure 1 and Figure 2 FIG. 1 shows a flame arrester according to an embodiment of the present invention, comprising an outer tube 1, an inner tube 2, and a flame arrester core 3. The outer tube 1 wraps around the inner tube 2 and is in communication with the inner tube 2. The flame arrester core 3 is housed within the inner tube 2. A first drain valve 4 is provided at the bottom of the outer tube 1. The outer tube 1 is partially disposed indoors and partially outdoors. The inner tube 2 is partially disposed indoors and partially outdoors. The exhaust gas inlet of the outer tube 1 is located indoors.

[0028] There is an outer cavity between the outer tube 1 and the inner tube 2, the internal cavity of the inner tube 2 is the inner cavity, the fire-blocking core 3 is fixed in the inner cavity, the outer tube 1 includes an indoor and outdoor cavity tail gas inlet 11 located indoors and an outdoor outer cavity tail gas outlet 12 located outdoors, the indoor and outdoor cavity tail gas inlet 11 and the outdoor outer cavity tail gas outlet 12 are respectively communicated with the outer cavity, the inner tube 2 includes an indoor cavity tail gas inlet 21 located indoors and an outdoor cavity tail gas outlet 22 located outdoors, the indoor cavity tail gas inlet 21 and the outdoor cavity tail gas outlet 22 are respectively communicated with the inner cavity, the outdoor outer cavity tail gas outlet 12 is communicated with the indoor cavity tail gas inlet 21 through a connecting pipe 8, the connecting pipe 8 is partially arranged outdoors and partially arranged indoors, and the cross-sectional area of ​​the indoor and outdoor cavity tail gas inlet 11 is smaller than the cross-sectional area of ​​the outer cavity;

[0029] The indoor and outdoor cavity tail gas inlet 11 is located at the lower part of the outer tube 1, the outdoor outer cavity tail gas outlet 12 is located at the upper part of the outer tube 1, the inner tube 2 is arranged from top to bottom, and the indoor inner cavity tail gas inlet 21 is located at the lower part of the inner tube 2, the outdoor inner cavity tail gas outlet 22 is located at the upper part of the inner tube 2, and the fire-blocking core 3 is located on the outdoor side;

[0030] The outer tube 1 includes an outer tube upper part 13 and an outer tube lower part 14 that are fixedly connected, the inner tube 2 includes an inner tube upper part 23 and an inner tube lower part 24 that are fixedly connected, the fire-retardant core 3 is fixed at the connection between the inner tube upper part 23 and the inner tube lower part 24, a sealing ring is provided at the connection between the outer tube upper part 13 and the outer tube lower part 14, and a sealing ring is provided at the connection between the inner tube upper part 23 and the inner tube lower part 24.

[0031] Specifically, the flame arrester of this embodiment mainly includes an inner tube 2, an outer tube 1, an inner cavity formed within the inner tube 2, an outer cavity formed between the inner tube 2 and the outer tube 1, a flame arrester core 3, an inner sealing ring, an outer sealing ring, a first drain valve 4, etc. The main gas inlets and outlets include an indoor and outdoor cavity tail gas inlet 11, an outdoor external cavity tail gas outlet 12, an indoor inner cavity tail gas inlet 21, and an outdoor inner cavity tail gas outlet 22. The inlets and outlets are all connected in the form of flanges, and the flange diameter is determined according to the actual needs of the laboratory or experimental plant.

[0032] The core part of the flame arrester is a double-layer structure, with an exhaust pipe and a fire-stop core inside. The outer tube 1 wraps the inner tube 2, and the inner tube 2 has an inner cavity. The outer cavity is between the inner tube 2 and the outer tube 1. The exhaust gas enters the outer cavity from the indoor and outdoor cavity exhaust gas inlet 11 of the outer tube 1, and returns to the indoor and outdoor cavity exhaust gas inlet 21 of the inner tube 2 from the outdoor outdoor cavity exhaust gas outlet 12 on the outdoor side to enter the inner cavity. After passing through the inner cavity and the fire-stop core 3, the purpose of fire prevention is achieved, and the exhaust gas is finally discharged from the outdoor inner cavity exhaust gas outlet 22. The flame arrester itself is placed at the interface between the laboratory (experimental plant) and the outdoors, that is, part of it is indoors and part of it is outdoors. The fire-stop core 3 is located on the outdoor side, and the specific values ​​of the upper height h2 of the inner and outer tubes and the lower height h1 of the inner and outer tubes are adjustable. The contact surfaces h1 and h2 divide the flame arrester into two parts, upper and lower. The upper inner tube portion 23 and the upper outer tube portion 13 of the upper half are sealed with the lower inner tube portion 24 and the lower outer tube portion 14 of the lower half via sealing rings, and the contact surfaces are fastened by flanges. During installation, with the upper and lower parts open, the flame arrester core 3 is installed, followed by the inner and outer sealing rings at the contact surface, and finally, the parts are fastened with the fastening bolts 5. The upper outer tube portion 13 and the upper inner tube portion 23 can be pre-fixed together to form the upper inner and outer tube portions, and the lower outer tube portion 14 and the lower inner tube portion 24 can be pre-fixed together to form the lower inner and outer tube portions, and the upper inner and outer tube portions are fastened to the lower inner and outer tube portions using the fastening bolts 5 in conjunction with the gaskets 6.

[0033] Even in cold seasons, the indoor temperature is kept above 5 degrees Celsius due to heating and insulation measures. When the exhaust gas enters the outer cavity from the indoor and outdoor cavity exhaust gas inlet 11 of the outer tube 1 and is discharged from the outdoor cavity exhaust gas outlet 12 on the outdoor side, on the one hand, the cross-sectional area of ​​the exhaust gas entering the outer cavity suddenly increases, and the gas velocity decreases significantly, because the indoor and outdoor cavity exhaust gas inlet 11 is located at the lower part of the outer tube 1 and the outdoor cavity exhaust gas outlet 12 is located at the upper part of the outer tube 1. Therefore, the exhaust gas will contact the outdoor part of the outer tube 1 when leaving the outer cavity and will gradually be cooled. After reaching the dew point, the water vapor in the exhaust gas cools down along the outer tube 1 and is discharged from the first drain valve 4, which serves the purpose of condensing the water vapor in the exhaust gas and reduces the possibility of blockage from the root. On the other hand, the exhaust gas in the outer cavity wraps around the inner tube 2, and the sensible heat of the exhaust gas has a preheating effect on the inner tube 2, preventing the low-temperature air of the external environment from directly contacting the internal pipe, ensuring that the internal pipe is kept above a certain temperature, thereby avoiding ice clogging the fire-blocking core 3. The inner tube 2 is arranged from top to bottom, and the indoor inner cavity exhaust gas inlet 21 is located at the lower part of the inner tube 2, and the outdoor inner cavity exhaust gas outlet 22 is located at the upper part of the inner tube 2. Therefore, the exhaust gas is discharged from bottom to top, and the exhaust gas before entering the fire-blocking core 3 will be preheated at the lower part of the inner tube 2, further avoiding ice clogging. The outdoor outer cavity exhaust gas outlet 12 is connected to the indoor inner cavity exhaust gas inlet 21 through a connecting pipe 8. Since the connecting pipe 8 is partially arranged outdoors and partially arranged indoors, the water vapor that has not condensed in the outer cavity will condense in the connecting pipe 8 when the exhaust gas passes through the connecting pipe 8, further avoiding ice clogging. In one embodiment, a second drain valve 9 is provided at the bottom of the connecting pipe 8 to discharge the condensed water in the connecting pipe 8.

[0034] In the cold northern regions, the winter temperature can reach -20 degrees Celsius or even lower. Laboratories in scientific research institutes are equipped with heating equipment, so the indoor temperature is basically maintained at 18 degrees Celsius. Experimental plants are larger in size and have ventilation requirements, so the indoor temperature can be as low as 5 degrees Celsius. The exhaust vent flame arresters in laboratories and experimental plants are prone to ice blockage in winter. The diameter of the exhaust vent pipelines in laboratories and experimental plants generally ranges from 6mm to 50mm. Because scientific research experiments in laboratories and plants are highly random and uncertain, the physical and chemical properties of the emitted gases vary greatly. Most exhaust gases are washed with alkali or water, and are saturated with water vapor. Therefore, in winter, the exhaust vent flame arresters are more susceptible to ice blockage.

[0035] For scientific research institutions and university laboratories in cold regions, exhaust gas vent flame arresters are prone to ice blockage. Therefore, the new flame arrester structure proposed by the present invention to address the above situation has strong practicality and feasibility.

[0036] The flame arrester of the present invention was used in a certain experimental plant. Its basic parameters were as follows: the exhaust gas inlet and outlet flanges (indoor and outdoor cavity exhaust gas inlet 11, outdoor cavity exhaust gas outlet 12, indoor cavity exhaust gas inlet 21, and outdoor cavity exhaust gas outlet 22) were all DN50 flanges. The outer pipe 1 was DN200, and the inner pipe 2 was DN100 at the flame arrester core 3. The upper height h2 of the inner and outer pipes was 0.3m, the lower height h1 of the inner and outer pipes was 1m, and the contact surface was 0.5m from the roof. The indoor portion had an additional 0.5m.

[0037] During long-term use at outdoor ambient temperatures of minus 5 degrees, minus 10 degrees and minus 20 degrees, the flame arrester was able to function normally and no ice or blockage was found.

[0038] The present invention adopts a double-layer structure for the core part of the flame arrester. The design of the double-layer structure allows the temperature of the inner cavity where the flame arrester core is located to be maintained above a certain temperature, and the tail gas passes through the outer cavity to preheat the inner cavity, so that the water content in the tail gas passing through is less, and at the same time, the water in the tail gas is condensed, preventing ice from forming from two perspectives: reducing the water content in the tail gas and preheating the inner cavity. Compared with traditional electric heating or using condensed water from nearby compressors as a heat source, the present invention uses the sensible heat of the tail gas itself, does not add other heat sources, does not introduce unnecessary equipment or complex structures, has low cost, and is safer. Finally, the outer tube and the inner tube are divided into two parts, and the upper and lower parts of the inner and outer tubes of different heights can be used to meet different installation requirements.

[0039] Comparative Example 1:

[0040] A conventional flame arrester is installed on the roof of a certain experimental plant. The inlet and outlet flanges 7 are DN50, the diameter of the flame arrester core is 100 mm, and the exhaust gas is saturated after water washing with a flow rate of 25 liters / minute (L / min).

[0041] During long-term use at an outdoor ambient temperature of minus 10 degrees Celsius, ice formed and clogged the flame arrester core, making it difficult to vent the exhaust gas and causing the experimental device to leak, triggering an alarm.

[0042] Comparative Example 2:

[0043] A conventional flame arrester is installed on the roof of a certain experimental plant. The inlet and outlet flanges 7 are DN50, the diameter of the flame arrester core is 100mm, and the exhaust gas is saturated after water washing, with a flow rate of 34L / min.

[0044] During long-term use at an outdoor ambient temperature of minus 10 degrees Celsius, ice formed and clogged the flame arrester core, making it difficult to vent the exhaust gas and causing the experimental device to leak, triggering an alarm.

[0045] Comparative Example 3:

[0046] A conventional flame arrester is installed on the roof of a certain experimental plant. The inlet and outlet flanges 7 are DN50, the diameter of the flame arrester core is 100mm, and the exhaust gas is saturated after alkaline washing, with a flow rate of 34L / min.

[0047] During long-term use at an outdoor ambient temperature of minus 20 degrees Celsius, ice formed and clogged the flame arrester core, making it difficult to vent the exhaust gas and causing the experimental device to leak, triggering an alarm.

[0048] Example 1

[0049] The flame arrester of the present invention was installed on the roof of a certain experimental factory building. Its basic parameters were as follows: the exhaust gas inlet and outlet flanges (indoor and outdoor cavity exhaust gas inlet 11, outdoor cavity exhaust gas outlet 12, indoor cavity exhaust gas inlet 21, and outdoor cavity exhaust gas outlet 22) all used DN50 flanges. The outer pipe 1 was DN200, and the inner pipe 2 was DN100 at the flame arrester core. The upper portion of the inner and outer pipes had a height (h2) of 0.3m, the lower portion (h1) of 1m, and the contact surface was 0.5m from the roof. The indoor portion had an additional 0.5m. The exhaust gas was saturated with water, with a flow rate of 25L / min.

[0050] During long-term use at an outdoor ambient temperature of minus 20 degrees Celsius, the flame arrester was able to function normally and no ice or blockage was found.

[0051] Example 2

[0052] The flame arrester of the present invention was installed on the roof of a certain experimental factory building. Its basic parameters were as follows: the exhaust gas inlet and outlet flanges (indoor and outdoor cavity exhaust gas inlet 11, outdoor cavity exhaust gas outlet 12, indoor cavity exhaust gas inlet 21, and outdoor cavity exhaust gas outlet 22) all used DN50 flanges. The outer pipe 1 was DN200, and the inner pipe 2 was DN100 at the flame arrester core 3. The height h2 of the upper portion of the inner and outer pipes was 0.3m, and the height h1 of the lower portion of the inner and outer pipes was 1m. The contact surface was 0.5m from the roof. The indoor portion had an additional 0.5m. The exhaust gas was saturated with water, and the flow rate was 18L / min.

[0053] During long-term use at an outdoor ambient temperature of minus 20 degrees Celsius, the flame arrester was able to function normally and no ice or blockage was found.

[0054] Comparison of the effects of Comparative Examples 1-3 and Examples 1-2:

[0055]

[0056] It can be seen that in Example 1 and Example 2, when the ambient temperature is -20°C and different exhaust gas flow rates flow through the flame arrester, no ice blockage occurs when using the flame arrester of the present invention.

[0057] Therefore, the present invention can ensure that the exhaust gas from laboratories and experimental plants in cold areas in winter can pass through the vent flame arrester smoothly without icing and causing blockage.

[0058] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A flame arrester, characterized in that: include: An outer tube (1), an inner tube (2), and a fire-retardant core (3), wherein the outer tube (1) wraps around the inner tube (2), and the outer tube (1) is in communication with the inner tube (2), the fire-retardant core (3) is accommodated in the inner tube (2), the outer tube (1) is partially arranged indoors and partially arranged outdoors, the inner tube (2) is partially arranged indoors and partially arranged outdoors, and the tail gas inlet of the outer tube (1) is located indoors; The outer cavity is formed between the outer tube (1) and the inner tube (2), the inner cavity of the inner tube (2) is the inner cavity, the fire-blocking core (3) is fixed in the inner cavity, the outer tube (1) comprises an indoor and outdoor cavity tail gas inlet (11) located indoors and an outdoor outdoor cavity tail gas outlet (12) located outdoors, the indoor and outdoor cavity tail gas inlet (11) and the outdoor outdoor cavity tail gas outlet (12) are respectively connected to the outer cavity, the inner tube (2) comprises an indoor and outdoor cavity tail gas inlet (21) located indoors and an outdoor indoor cavity tail gas outlet (22) located outdoors, the indoor and outdoor cavity tail gas inlet (21) and the outdoor indoor cavity tail gas outlet (22) are respectively connected to the inner cavity, and the outdoor outdoor cavity tail gas outlet (12) is connected to the indoor and outdoor cavity tail gas inlet (21); The indoor and outdoor cavity tail gas inlet (11) is located at the lower part of the outer tube (1), the outdoor outer cavity tail gas outlet (12) is located at the upper part of the outer tube (1), the inner tube (2) is arranged from top to bottom, and the indoor inner cavity tail gas inlet (21) is located at the lower part of the inner tube (2), and the outdoor inner cavity tail gas outlet (22) is located at the upper part of the inner tube (2); The outdoor outer cavity tail gas outlet (12) is connected to the indoor inner cavity tail gas inlet (21) via a connecting pipe (8), and the connecting pipe (8) is partially arranged outdoors and partially arranged indoors.

2. The flame arrester according to claim 1, characterized in that The cross-sectional area of ​​the exhaust gas inlet (11) of the indoor and outdoor cavities is smaller than the cross-sectional area of ​​the outdoor cavity.

3. The flame arrester according to claim 1, characterized in that The fire-blocking core (3) is located on the outdoor side.

4. The flame arrester according to claim 1, characterized in that It also includes a first drain valve (4) arranged at the bottom of the outer tube (1).

5. The flame arrester according to claim 1, characterized in that The outer tube (1) comprises an outer tube upper portion (13) and an outer tube lower portion (14) that are fixedly connected, and the inner tube (2) comprises an inner tube upper portion (23) and an inner tube lower portion (24) that are fixedly connected.

6. The flame arrester according to claim 5, characterized in that The fire-retardant core (3) is fixed at the connection between the inner tube upper portion (23) and the inner tube lower portion (24).

7. The flame arrester according to claim 5, characterized in that A sealing ring is provided at the connection between the outer tube upper part (13) and the outer tube lower part (14), and a sealing ring is provided at the connection between the inner tube upper part (23) and the inner tube lower part (24).

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