Flame Arrester

Abstract

A flame arrester is provided that includes a flame arrester housing having an inlet and an outlet, and a flame-retardant core disposed within the housing. A flame arresting mechanism is disposed within the flame arrester housing between the flame-retardant core and the inlet to prevent flames from directly impinging on a central zone of the flame-retardant core. The flame arresting mechanism may include a flame-retardant tube and a flame-retardant plate assembly disposed within the flame arrester housing.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

[0001] This application claims priority to Chinese Patent Application No. 202010561387.3, filed on June 18, 2020, entitled "Flame Arrester with Explosion-Resistant Unit," and Chinese Patent Application No. 202010562084.3, filed on June 18, 2020, entitled "Flame Arrester with Flame-Retardant Plate," the entire contents of which are incorporated herein by reference. [Technical Field]

[0002] The present invention relates to the technical field of pipeline flame resistance and explosion suppression, and in particular to flame arresters. [Background technology]

[0003] A flame arrester is a safety device used to stop the flame propagation of flammable gases and flammable liquid vapors. Flame arresters are typically installed in pipelines delivering flammable gases to prevent the propagation of flames from passing through.

[0004] Existing flame arresters typically include a generally cylindrical flame arrester housing and a flame-retardant core disposed within the flame arrester housing. The flame-retardant core includes numerous small passages that allow the flame passing through it to be separated into numerous small flame beams. In this way, based on the heat transfer effect and the wall effect, the flame arrester can reduce the temperature of the flame below the ignition point, meaning that the combustion reaction cannot continue to proceed. Therefore, the flame is prevented from propagating through the flame arrester.

[0005] However, deflagration and explosion often occur during fires. As a result, the flame propagating through the pipeline often includes deflagration or explosion flames. Existing flame arresters are not sufficiently effective in suppressing such deflagration or explosion flames. Increasing the thickness of the flame-retardant core or reducing the pore size of the flame-retardant core cannot sufficiently and effectively prevent explosions and deflagrations. Summary of the Invention

[0006] In view of the above technical problems, an object of the present invention is to provide an improved flame arrester that can effectively suppress deflagration and explosive flames.

[0007] According to the present invention, there is provided a flame arrester comprising a flame arrester housing having an inlet and an outlet, and a flame-retardant core disposed within the flame arrester housing, the flame arrester housing including a flame arresting mechanism disposed between the flame-retardant core and the inlet for preventing flames from directly impinging on a central zone of the flame-retardant core.

[0008] In a preferred embodiment, the flame arresting mechanism includes a flame-retardant tube having one end communicating with the inlet and the other end closed, and a medium flow passage is provided in the peripheral wall of the flame-retardant tube.

[0009] In a particular embodiment, the passages are formed by a plurality of grids extending in the axial direction of the flame-retardant tube, and the grids preferably have different widths.

[0010] In a specific embodiment, the passage is formed by a plurality of through holes arranged in the peripheral wall of the flame-retardant tube.

[0011] In a specific embodiment, the flame-retardant tube has a perforated portion or a mesh portion, and the perforations of the perforated portion or the mesh of the mesh portion form the passages.

[0012] In a specific embodiment, the flame-retardant tube has a perforated portion and a mesh portion arranged adjacent to each other in the axial or radial direction, and the perforations of the perforated portion or the mesh of the mesh portion form the passage.

[0013] In a preferred embodiment, the total area of ​​the passages is greater than twice the cross-sectional area of ​​the media delivery pipeline connected to the flame arrestor.

[0014] In a preferred embodiment, the flame-retardant tube is configured so that its volume gradually increases in a direction toward the flame-retardant core.

[0015] In a preferred embodiment, the flame arresting mechanism includes two flame retardant tubes arranged symmetrically with respect to the flame retardant core.

[0016] In a preferred embodiment, the flame arrester housing is formed in a cylindrical shape and is connected to the inlet and the outlet via connection portions on both sides, The flame arrester housing has transition portions in areas adjacent to each connection portion, and the flame retardant tube is disposed in the transition portions.

[0017] In a preferred embodiment, the flame arresting mechanism further comprises a flame retardant plate assembly disposed between the flame retardant tube and the flame retardant core.

[0018] In a preferred embodiment, the flame retardant plate assembly includes at least a first flame retardant plate and a second flame retardant plate spaced apart from each other in the axial direction, the first and second flame retardant plates being circumferentially staggered on the inner wall of the flame arrestor housing and overlapping each other within a central cross section of the flame arrestor housing.

[0019] In certain embodiments, the first and second flame retardant plates are each formed as a partially circular plate consisting of an upper arc segment and a straight segment, the upper arc segments of the first and second flame retardant plates being both attached to an interior wall of the flame arrestor housing, while the straight segments of the first and second flame retardant plates are parallel to each other and extend beyond the longitudinal centerline of the flame arrestor housing.

[0020] In a specific embodiment, the angle formed between the cross section of the flame arrestor housing and each of the first and second flame-retardant plates is greater than or equal to 0 degrees and less than or equal to 45 degrees, and preferably greater than or equal to 0 degrees and less than or equal to 25 degrees.

[0021] In a specific embodiment, a through hole is formed in each of the first and second flame retardant plates in an area close to the inner wall of the flame arrestor housing, and the angle formed between the through hole and the longitudinal center line of the flame arrestor housing is preferably less than 90 degrees.

[0022] In a specific embodiment, the flame arrestor satisfies the following relationships: 1.5d≧h1≧d, 1.5d≧h2≧d, D≧2d, h1>0.5D, and h2>0.5D, where D is the diameter of the body of the flame arrestor housing, d is the diameter of the connection portion, and h1 and h2 are the lengths of the first and second flame retardant plates projected onto the cross section of the flame arrestor housing, respectively.

[0023] In a preferred embodiment, the flame retardant plate assembly includes a central flame retardant plate arranged on the axial centerline of the flame arrestor housing and three peripheral flame retardant plates arranged in an equilateral triangle with respect to the axial centerline, and the central flame retardant plate and the peripheral flame retardant plate are each configured as an arc-shaped plate.

[0024] In a specific embodiment, the central flame-retardant plate and the peripheral flame-retardant plates are all bent along the media flow direction, with the central flame-retardant plate being positioned ahead of the peripheral flame-retardant plates in the media flow direction, or the central flame-retardant plate and the peripheral flame-retardant plates are all bent against the media flow direction, with the central flame-retardant plate being positioned behind the peripheral flame-retardant plates in the media flow direction.

[0025] In a specific embodiment, the area of ​​the circumscribed circle of the projected images of the central flame retardant plate and the peripheral flame retardant plate on the flame retardant core is larger than the cross-sectional area of ​​the connection portion of the flame arrestor housing, and the projected image of the central flame retardant plate on the flame retardant core at least partially overlaps with the projected image of the peripheral flame retardant plate on the flame retardant core.

[0026] In certain embodiments, two flame retardant plate assemblies are positioned symmetrically within the flame arrestor housing relative to the flame retardant core.

[0027] According to the present invention, there is further proposed a flame arrester comprising: a flame arrester housing having a substantially cylindrical body, connecting portions connected to each end of the body, and ports connected to each connecting portion, wherein each end of the body is connected to the connecting portions via a transition portion; a flame retardant core disposed in the flame arrester housing; a flame retardant tube disposed in the transition portion of the body, the flame retardant tube having a first end communicating with the port via the connecting portion and a closed second end facing the flame retardant core, wherein a passage for medium flow is formed on the peripheral wall of the flame retardant tube; and a flame retardant plate assembly disposed between the flame retardant tube and the flame retardant core, the flame retardant plate assembly comprising at least a first flame retardant plate and a second flame retardant plate spaced apart from each other in the axial direction, the first and second flame retardant plates being attached to the inner wall of the flame arrester housing in a staggered manner in the circumferential direction and overlapping each other within the central cross section of the flame arrester housing. [Brief explanation of the drawings]

[0028] Exemplary embodiments of the present invention will now be described in detail with reference to the drawings, in which: [Figure 1] 1 shows the overall configuration of a flame arrester using a flame-retardant plate assembly according to a first embodiment of the present invention. [Figure 2] 2 is a schematic plan view of a flame-retardant board having a flat-surfaced flame arrestor as shown in FIG. 1, showing the distribution of through-holes on the flame-retardant board. [Figure 3] FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] 1 shows the overall configuration of a first modified example of the flame arrester according to the first embodiment of the present invention. [Figure 5] 3 shows the overall configuration of a second modified example of the flame arrester according to the first embodiment of the present invention. [Figure 6] The arrangement and positional relationship of four flame-retardant plates in a flame arrester as shown in Figure 5 is shown schematically. [Figure 7] 4 shows the overall configuration of a third modified example of the flame arrester according to the first embodiment of the present invention. [Figure 8] 4 shows the overall configuration of a flame arrester using a flame-retardant tube according to a second embodiment of the present invention. [Figure 9] 10 shows the overall configuration of a first modified example of a flame arrester according to a second embodiment of the present invention. [Figure 10] 10 shows the overall configuration of a second modified example of a flame arrester according to a second embodiment of the present invention. [Figure 11] 10 shows the overall configuration of a third modified example of the flame arrester according to the second embodiment of the present invention. [Figure 12] 10 shows the overall configuration of a fourth modified example of the flame arrester according to the second embodiment of the present invention. [Figure 13] 10 shows the overall configuration of a fifth modified example of the flame arrester according to the second embodiment of the present invention. [Figure 14] 10 shows the overall configuration of a sixth modified example of the flame arrester according to the second embodiment of the present invention. [Figure 15] 10 shows the overall configuration of a flame arrester according to a third embodiment of the present invention.

[0029] In the drawings, like reference numbers are used to denote like elements. The drawings are not drawn to scale. DETAILED DESCRIPTION OF THE INVENTION

[0030] The present invention will be further described below with reference to the drawings. In the context of the present invention, the directional terms "up," "down," "right," "left," "in," "out," etc. refer to the "up," "down," "right," and "left" directions in the corresponding drawings, as well as the "in" and "out" directions of the associated components. Furthermore, the direction along the length of the associated components is referred to as the "longitudinal" or "axial" direction, and the direction perpendicular to the "longitudinal" or "axial" direction is referred to as the "radial" direction. Furthermore, the terms "deflagration" and "explosion" can generally be used interchangeably unless otherwise specified.

[0031] FIG. 1 shows a flame arrester 100 according to a first embodiment of the present invention. As shown in FIG. 1, the flame arrester 100 according to the first embodiment of the present invention includes a flame arrester housing 101 and a flame-retardant core 200 disposed within the flame arrester housing 101. The flame arrester housing 101 is generally cylindrical and includes a main body 102 and two connection portions 103 disposed on either side of the main body 102. Each of the two connection portions 103 has an inlet 110 and an outlet 120, both of which are connected to a medium delivery pipeline 400. (FIG. 1 only shows that the inlet 110 is connected to the medium delivery pipeline 400.) Generally speaking, the main body 102 and the connection portion 103 are generally cylindrical and have diameters D and d, respectively, where D>d. In practice, D is usually 2 to 4 times d, and particularly about 2 times d. Furthermore, the main body 102 is usually connected to each connection portion 103 via a transition portion 105 , and the flame-retardant core 200 is positioned approximately at the axial center position of the flame arrester housing 101 .

[0032] The flame-retardant core 200 can have a variety of structures, including, for example, a corrugated sheet, a wire mesh, a sintered metal filler, a metal foam, a metal shot, a filler material, etc. It should be noted that different types of gas media have different requirements for the unit feature size of the flame-retardant core 200. At the same time, the flame-retardant core 200 itself should include a structure with a certain support capability to prevent the flame-retardant core 200 from being damaged when impacted by a deflagration or explosion. The design of the flame-retardant core 200 is well known to those skilled in the art and will not be repeated here.

[0033] The inventors of the present application have surprisingly found through numerous tests that when a deflagration or explosion occurs in a pipeline, the deflagration or explosion flame will impinge to the greatest extent on the region of the flame-retardant core located at the center of the pipeline, and the zone facing the explosion will gradually expand in all radial directions. Based on the findings of this invention, the inventors of the present application have improved the conventional flame arrester and added thereto a flame arresting mechanism for preventing the deflagration or explosion flame from impinging on the central zone of the flame arrester.

[0034] According to a first embodiment of the present invention, a flame retardant plate assembly 300 is provided within the body 102 of the flame arrestor housing 101 between the inlet 110 and the flame retardant core 200. The flame retardant plate assembly 300 is configured to prevent a deflagration or explosion flame from the medium delivery pipeline 400 from directly impinging on a central zone of the flame retardant core 200. Specifically, in the embodiment shown in FIG. 1 , the flame retardant plate assembly 300 includes a first flame retardant plate 301 and a second flame retardant plate 306. The first and second flame retardant plates 301, 306 are arranged in tandem along the longitudinal axis of the flame arrestor housing 101 and are spaced apart from each other by a distance. On the other hand, the first and second flame retardant plates 301, 306 are arranged diametrically opposite each other in the circumferential direction of the main body 102 of the flame arrester housing 101, with their radially outer sides connected to the inner surface of the main body 102 and their radially inner sides at least partially overlapping each other in the central region of the flame arrester housing 101.

[0035] This structure forms a serpentine flow path for the flame to pass through within the flame arrester housing 101, as shown by the arrows in Fig. 1. Therefore, upon entering the flame arrester 100 through the inlet 110, the deflagration or explosion flame from the medium delivery pipeline 400 changes its propagation direction, thereby slowing down its propagation speed, under the blocking and guiding action of the first and second flame retardant plates 301, 306 of the flame retardant plate assembly 300, as shown by the arrows in Fig. 1. The flame then passes through the flame retardant core 200 and is extinguished. Finally, the medium flows out through the outlet 120.

[0036] As can be seen from the above, according to the present invention, by disposing the flame-retardant plate assembly 300 between the flame-retardant core 200 and the inlet 110 in the flame arrester housing 101, the deflagration or explosion flame can be diverted, the impact of the deflagration or explosion flame on the central zone of the flame-retardant core 200 can be reduced, and the propagation speed of the deflagration or explosion flame can be reduced, thereby effectively achieving the purpose of resistance to deflagration or explosion. At the same time, the structure is compact and lightweight, easy to manufacture, and low-cost.

[0037] At the same time, according to the flame arrester 100 according to the first embodiment of the present invention, the first and second flame retardant plates 301, 306 of the flame retardant plate assembly 300 are disposed within the main body 102 of the flame arrester housing 101 and are spaced apart from each other, so that the medium can still flow smoothly through the flame arrester housing 101. Therefore, compared to flame arresters of conventional structures, the flame arrester 100 according to the first embodiment of the present invention not only effectively prevents explosions and deflagrations, but also has high efficiency in the fluidity of the medium.

[0038] In addition, according to the flame arrester 100 of the first embodiment of the present invention, the impact of a deflagration or explosion flame on the central zone of the flame-retardant core 200 is reduced, so that the deflagration or explosion flame impinges more heavily on the peripheral zone of the flame-retardant core 200. In this way, on the one hand, the flame-retardant effect can be effectively improved because the peripheral zone has a large area and a strong heat absorption ability. On the other hand, the impact resistance of the flame-retardant core 200 can be improved because the peripheral region is better supported. Therefore, the service life and flame resistance performance of the flame-retardant core 200 in the flame arrester 100 of the first embodiment of the present invention are also significantly improved.

[0039] Hereinafter, a specific configuration of the flame-retardant plate used in the flame arrestor 100 according to the first embodiment of the present invention will be described using the first flame-retardant plate 301 as an example. FIG. 2 is a schematic plan view of the first flame-retardant plate 301. As shown in FIG. 2, the first flame-retardant plate 301 has a diameter corresponding to the inner diameter of the main body 102 of the flame arrestor housing 101, but is configured as a flat circular plate with a portion cut out. That is, the cross section of the first flame-retardant plate 301 is made up of an upper arc segment 304 and a straight segment 303. Therefore, the area of ​​the first flame-retardant plate 301 is larger than half the cross-sectional area of ​​the main body 102, but smaller than the entire cross-sectional area of ​​the main body 102.

[0040] Additionally, the flame-retardant plate should be able to withstand the impact of explosion pressure. Typically, the flame-retardant plate should deform less than 5% without structural damage under an impact 20 times the design pressure of the flame arrester. Therefore, the thickness of the flame-retardant plate should be selected based on the flame-retardant medium and pressure. In this embodiment, the thickness of the first flame-retardant plate 301 should be 5 mm or more. If necessary, the first flame-retardant plate 301 may be provided with reinforcing ribs (not shown). The reinforcing ribs are typically made of stainless steel or carbon steel and are attached to the flame-retardant plate by welding, riveting, or integral molding to form a ridge or rib shape on the surface of the flame-retardant plate. The allowable pressure of the reinforcing ribs should also be 20 times or more the design pressure of the flame arrester.

[0041] In order to further facilitate the flow of the medium while effectively preventing explosions and detonations, as shown in Fig. 2, a plurality of separate through holes 302 are formed in the first flame-retardant plate 301 in an area away from the straight segment 303 (i.e., the area adjacent to the inner wall of the main body 102 of the flame arrestor housing 101, i.e., the upper half area of ​​Fig. 2) to improve the flow efficiency of the flame arrestor. In a preferred embodiment, as shown in Fig. 3, the angle α between the center line of each through hole 302 and the thickness direction of the first flame-retardant plate 301 is 90° or less. That is, the through holes 302 are formed as inclined holes on the flat surface of the first flame-retardant plate 301, so as to guide the flame away from the central area of ​​the flame-retardant core.

[0042] Although not discussed in detail, it can be understood that the second fire-retardant board 306 has the same structure as the first fire-retardant board 301, but the installation orientation is reversed.

[0043] Referring to FIG. 1 , in order to meet the requirement of minimizing flow rate drop while ensuring effective explosion resistance, the dimensions of the first flame-retardant plate assembly 300 must meet the following requirements: 1.5d ≥ h1 ≥ d; 1.5d ≥ h2 ≥ d; D ≥ 2d; h1>0.5D; and h2>0.5D; where d is the diameter of connecting portion 103, D is the diameter of main body 102, and h1 and h2 are respectively the projected lengths of first and second flame-retardant plates 301, 306 in the cross-sectional direction of flame arrester housing 101. In this embodiment, since first and second flame-retardant plates 301, 306 are both flat plates, h1 is the length of first flame-retardant plate 301, i.e., the farthest distance from straight line segment 303 of first flame-retardant plate 301 to any point on the periphery of first flame-retardant plate 301. h2 is defined similarly.

[0044] The distance between the first and second flame-retardant plates 301 and 306 can be selected according to the actual size of the main body 102. Generally, the distance between the first and second flame-retardant plates 301 and 306 should be 0.5h1 or 0.5h2 or less. At the same time, the distance between the flame-retardant plate closest to the flame-retardant core 200 (i.e., the second flame-retardant plate 306) and the flame-retardant core 200 should also be 0.5h1 or 0.5h2 or less.

[0045] 1 to 3, the operating procedure of the flame arrester 100 according to this embodiment will be described below. In normal operation, gas from the medium delivery pipeline 400 enters the flame arrester 100 from the inlet 110, flows through the connection part 103 and the flame-retardant plate assembly 300 along the arrows in FIG. 1, passes through the flame-retardant core 200, and finally enters the outlet-side medium delivery pipeline (not shown) via the outlet 120.

[0046] In a flame arresting state, a detonation flame from the medium delivery pipeline 400 enters the flame arrester housing 101 of the flame arrester 100 through the inlet 110 and the connection 103. In the flame arrester housing 101, the central part of the detonation flame flows along the arrows in FIG. 1 under the action of the first and second flame retardant plates 301, 306 of the circumferentially staggered flame retardant plate assembly 300, and therefore does not directly impinge on the central zone of the flame retardant core 200. At the same time, the peripheral part of the detonation flame is formed on the first and second flame retardant plates 301, 306 and passes directly through the through-holes 302 adjacent to the inner wall of the flame arrester housing 101 to reach the flame retardant core 200, and therefore does not directly impinge on the central zone of the flame retardant core 200. In addition, as the central portion of the explosion flame travels along a serpentine path, its propagation speed is significantly reduced due to the blocking effect of the flat surfaces of the first and second flame-retardant plates 301, 306. At the same time, the peripheral portion of the explosion flame passing through the through hole 302 also has a reduced speed. Based on this, the destructive power of the explosion flame is further reduced by the flame-retardant core 200 until it is extinguished.

[0047] Generally speaking, depending on the type of flammable gas and the level of vapor explosion, flame arresters can be classified as follows: a) Flame arrester for IIA1 gases (typically methane); b) Flame arresters for IIA gases (typically propane); c) Flame arrester for IIB1 gas (typically ethylene); d) Flame arrester for IIB2 gas (typically ethylene); e) Flame arrester for IIB3 gas (typically ethylene); f) a flame arrester for IIB gas (typically hydrogen); and g) Flame arresters for class IIC gases (typically hydrogen).

[0048] The technical solution of the present invention will be described in detail below through specific examples according to the explosion-proof level.

[0049] Currently, the test pressure for ethylene atmosphere is usually 1.1 bar, with the instantaneous pressure of the explosion shock greater than 70 bar and the average pressure being about 13-16 bar. Different test pipelines have different pressures. For DN100 pipelines, the instantaneous pressure of the explosion shock is greater than 72 bar and the average pressure is 13.4 bar.

[0050] According to the structure proposed in the first embodiment of the present invention, a flame arrester F1 for the propagation of ethylene in an atmosphere is provided. Specifically, the flame arrester F1 is suitable for a DN100 pipeline and has a total length of 500 mm. The flame-retardant core 200 is resistant to ethylene and includes a flame-retardant disk made of corrugated plate and a support member, and the total thickness of the flame-retardant core is 50 mm. The diameter of the flame arrester connection 103 is 100 mm, the diameter of the main body 102 is 220 mm, and the wall thickness of the flame arrester housing 101 is 6 mm. The lengths h1 and h2 of the flame-retardant plates 301 and 306 are both 120 mm, the distance between the two flame-retardant plates is 50 mm, and the distance between the flame-retardant core 200 and the second, closer flame-retardant plate 306 is 50 mm. Numerous tests have shown that the flame arrester F1 can withstand the explosive impact of an ethylene atmosphere at a higher pressure than normal and successfully extinguish the flame. The test pressure of the ethylene atmosphere is as high as 1.5 bar, with an explosive shock instantaneous pressure exceeding 121 bar and an average pressure of 20.2 bar. Therefore, the explosive shock instantaneous pressure that the flame arrester F1 can withstand is increased by 72% and the average pressure by 51%, thereby successfully extinguishing the flame.

[0051] The structure proposed in the first embodiment of the present invention also provides a flame arrester F2 for hydrogen propagation in an atmosphere. The only difference between the flame arrester F2 and the flame arrester F1 is that the flame-retardant core 200 of the flame arrester F2 is replaced with a hydrogen-resistant core. Currently, the test pressure for hydrogen atmospheres is typically 1.1 bar, with an instantaneous pressure of explosive impact of up to 65.4 bar and an average pressure of up to 8.2 bar. Numerous tests have shown that the flame arrester F2 can withstand the explosive impact of hydrogen atmospheres at higher pressures than usual and successfully extinguish the flame. The test pressure for hydrogen atmospheres is as high as 1.5 bar, with an instantaneous pressure of explosive impact exceeding 95.6 bar and an average pressure of 12.4 bar. This increases the pressure resistance of the flame arrester F2 by 51%.

[0052] Furthermore, according to the structure proposed in the first embodiment of the present invention, a flame arrester F3 for propane propagation in an atmosphere is provided. The only difference between the flame arrester F3 and the flame arrester F1 is that the flame-retardant core 200 of the flame arrester F3 is replaced with one for propane resistance. Currently, the test pressure for a propane atmosphere is typically 1.1 bar, with an instantaneous pressure of explosive impact exceeding 87.6 bar and an average pressure of up to 13.1 bar. Numerous tests have shown that the flame arrester F3 can withstand the explosive impact of a propane atmosphere at higher pressures than usual and successfully extinguish the flame. The test pressure for the propane atmosphere is as high as 1.6 bar, with an instantaneous pressure of explosive impact exceeding 126.4 bar and an average pressure of 21.3 bar. Therefore, the pressure resistance of the flame arrester F3 is increased by 62% compared to conventional flame arresters.

[0053] In addition to ethylene and hydrogen, the flammable gas typically includes methane, propylene, mixed gases, etc. Conventional flame arresters can withstand an average explosion impulse pressure in the range of 11 to 13 bar. However, the flame arrester of this embodiment can withstand an average explosion impulse pressure in the range of 16 to 20 bar, which represents an improvement of approximately 40 to 60% compared to conventional flame arresters.

[0054] Furthermore, in the prior art, the impact force of the flame entering the flame arrester on the flame-retardant core is generally about 25% of the average pressure of the explosive impact. However, according to this embodiment, the impact force of the flame on the flame-retardant core is about 17% to 20% of the average pressure of the explosive impact, which represents a reduction of about 20 to 35% compared to the prior art.

[0055] As can be seen from the detonation resistance procedures and test data of the above-mentioned specific examples of the flame arrester 100 provided by the first embodiment of the present invention, a deflagration or explosion flame entering the flame arrester from an external medium delivery pipeline cannot cause a direct impact on the flame-retardant core due to the presence of the flame-retardant plate assembly. Therefore, the structural strength of the flame-retardant core 200 used in the flame arrester 100 of the present invention can be designed more flexibly than existing flame-retardant cores, and the flame-retardant core 200 can also have a larger overall porosity, thereby improving its fluidity and facilitating its cleaning.

[0056] It should be noted that the specific configuration of the above-described flame arrestor 100 can be further modified based on the basic concept proposed in the first embodiment of the present invention. For example, the flame-retardant plate assembly can include three or more flame-retardant plates spaced apart from one another.

[0057] The flame-retardant plate may be a flat plate or a curved plate, a curved wave plate, an inclined plate, or the like, as long as it does not affect structural stability. In a preferred embodiment, the flame-retardant plate is an inclined plate. In this case, the angle α' between the extending direction of the flame-retardant plate and the cross-sectional direction of the flame-retardant housing satisfies 0°≦α'≦45°, preferably 0°≦α'≦25°.

[0058] Figure 4 shows a flame arrester 100A of a first modified example according to the first embodiment of the present invention. For the sake of brevity and clarity, in Figure 4, the same structures or components as those in Figures 1 to 3 are designated by the same reference numerals, and the description thereof will not be repeated here. Furthermore, all technical effects related to the flame arrester 100 are applicable to the flame arrester 100A, and the description thereof will not be repeated here.

[0059] 4, the flame arrester 100A differs from the flame arrester 100 in that, in addition to the flame retardant plate assembly 300 provided between the inlet 110 of the flame arrester housing 101 and the flame retardant core 200, another flame retardant plate assembly 300 is arranged between the outlet 120 of the flame arrester housing 101 and the flame retardant core 200. The two flame retardant plate assemblies 300 have the same structure and are arranged symmetrically with respect to the flame retardant core 200.

[0060] By symmetrically arranging the two flame-retardant plate assemblies 300 on both sides of the flame-retardant core 200 within the flame arrester housing 101, the following technical effects can be achieved. On the one hand, regardless of which direction the deflagration or detonation flame originates from in the flame arrester 100 (i.e., from the inlet 110 or the outlet 120), it is possible to effectively prevent the deflagration or detonation flame from impinging on the central zone of the flame-retardant core 200. On the other hand, taking the deflagration or detonation flame coming from the inlet 100 of the flame arrester 100 as an example, the remaining flame, after passing through the flame-retardant core 200 and therefore having reduced destructive power as described in relation to FIG. 1 , is further weakened by the flame-retardant plate assemblies 300 arranged between the outlet 120 of the flame arrester housing 101 and the flame-retardant core 200, and is therefore likely to be extinguished.

[0061] Figure 5 shows a flame arrester 100B of a second modified example according to the first embodiment of the present invention. For the sake of brevity and clarity, in Figure 5, the same structures or components as those in Figures 1 to 3 are designated by the same reference numerals, and the description thereof will not be repeated here. Furthermore, all technical effects related to the flame arrester 100 are applicable to the flame arrester 100B, and the description thereof will not be repeated here.

[0062] As shown in FIGS. 5 and 6, flame arrester 100B differs from flame arrester 100 in that flame retardant plate assembly 310 is composed of several arc-shaped plates. Specifically, in flame arrester 100B, flame retardant plate assembly 310 includes four flame retardant plates 310A-310D attached to bracket 315 (shown diagrammatically) fixedly connected to flame retardant core 200. One of the flame retardant plates, namely flame retardant plate 310A, is disposed on the axial centerline of flame arrester housing 101 and closer to inlet 110. Therefore, flame retardant plate 310A is also referred to as the central flame retardant plate. The other three flame retardant plates 310B-310D are arranged in an equilateral triangle with respect to the axial centerline and closer to the flame retardant core. Therefore, flame retardant plates 310B-310D are also referred to as peripheral flame retardant plates. In this way, the four flame-retardant plates 310A and 310D form a triangular pyramid-shaped structure in the flame arrestor 100B. As shown in Fig. 5, the arc shapes of the four flame-retardant plates 310A to 310D are all curved along the medium flow direction (i.e., the direction of the arrow in the figure).

[0063] 5, a flame retardant plate assembly 310 is disposed on either side of the flame retardant core 200, with the two assemblies 310 being symmetrically disposed about the flame retardant core 200. However, it is understood that only one flame retardant plate assembly 310 disposed between the inlet 110 of the flame arrestor housing 101 and the flame retardant core 200 is also feasible.

[0064] According to the present invention, the area of ​​the circumscribed circle S of the projected images of the three peripheral flame-retardant plates 310B-310D on the flame-retardant core 200 should be larger than the cross-sectional area of ​​the connecting portion 103 of the flame arrestor 100B. In addition, the projected image of the central flame-retardant plate 310A on the flame-retardant core 200 should at least partially overlap with each of the projected images of the peripheral flame-retardant plates 310B-310D on the flame-retardant core 200. Furthermore, the projected area of ​​the central flame-retardant plate 310A on the flame-retardant core 200 should be larger than half the cross-sectional area of ​​the connecting portion 103.

[0065] With this configuration, the plate surfaces of the four arc-shaped flame-retardant plates can effectively shield the central zone of the flame-retardant core 200, thus preventing the explosion flame from directly impinging on it. At the same time, except for a part of the explosion flame, the flame flowing through the flame-retardant core 200 flows along the arc-shaped surfaces of the flame-retardant plates 301.

[0066] The operating procedure of the flame arrester 100B of the second modified example according to the first embodiment of the present invention will be described below. Under normal operating conditions, gas from the medium delivery pipeline enters the flame arrester 100B from the inlet 110, passes through the connection and the left flame retardant plate assembly 310 along the arrows in Fig. 5 to reach the flame retardant core 200, passes through the flame retardant core 200, the right flame retardant plate assembly 310, and the outlet 120, and then flows into the medium delivery pipeline at the outlet.

[0067] In a flame arresting state, a burst flame from the media delivery pipeline enters the flame arrester 100B through the inlet 110. Inside the flame arrester housing 101, the center of the burst flame contacts the central flame-retardant plate 310A of the flame-retardant plate assembly 310, slows down its propagation along the arc-shaped surface of the central flame-retardant plate 310A, and encounters the three peripheral flame-retardant plates 310B-310D of the flame-retardant plate assembly 310. The central portion of the burst flame then flows along the arc-shaped plate surfaces of the three peripheral flame-retardant plates 310B-310D and finally reaches the flame-retardant core 200 in a dispersed state. In this way, the direct impingement of the burst flame on the central zone of the flame-retardant core 200 is significantly reduced. Furthermore, the peripheral portion of the burst flame flows around the flame-retardant core 200, guided by the peripheral portions of the three peripheral flame-retardant plates 310B-310D. The explosion flame then passes through the flame-retardant core 200 and then exits through the right-hand flame-retardant plate assembly 310 and outlet 120 .

[0068] According to the structure proposed by the second variant of the first embodiment of the present invention, a flame arrester F4 for the propagation of ethylene in the atmosphere is provided. Specifically, the flame arrester F4 is suitable for a DN200 pipeline and has a total length of 700 mm. Flame-retardant plate assemblies 310 are provided on both sides of the flame-retardant core 200. The central flame-retardant plate 310A of each flame-retardant plate assembly 310 has a projected diameter of 120 mm, a plate surface curvature of 60°, and a distance of 150 mm from the apex of the plate surface to the flame-retardant core 200. The three peripheral flame-retardant plates 310B-310D each have a projected diameter of 90 mm, a plate surface curvature of 90°, and a distance of 120 mm from the apex of the plate surface to the flame-retardant core 200. The diameter of the circumscribed circle of the isotropic surfaces of the four flame-retardant plates is 220 mm. Bracket 315 is a high-strength screw with a cross-sectional diameter of 15 mm. One end is welded to the flame-retardant plate, and the other end is connected to the flame-retardant core via a thread. Flame-retardant core 200 includes a corrugated flame-retardant disk and a support with a total thickness of 100 mm. More specifically, the diameter of the connection part of the flame arrestor housing is 200 mm, and the diameter of the main body is 430 mm.

[0069] In the prior art, the test pressure of the ethylene atmosphere is usually 1.1 bar, the instantaneous pressure of the explosive impulse is up to 98.3 bar, and the average pressure is up to 16.2 bar. In contrast, the flame arrester F4 can successfully pass the test for resistance to the explosive flame of an ethylene atmosphere with a test pressure of 1.65 bar, an instantaneous pressure of the explosive impulse is up to 142.7 bar, and an average pressure of up to 24.9 bar. This indicates that the pressure capacity of the flame arrester F4 is 53% higher than that of the prior art.

[0070] 7 shows a flame arrester 100C of a third modified example according to the first embodiment of the present invention. For the sake of brevity and clarity, in FIG. 7, the same structures or components as those in FIG. 5 are given the same reference numerals, and the description thereof will not be repeated here. In addition, all technical effects related to the flame arrester 100B are applicable to the flame arrester 100C, and the description thereof will not be repeated here.

[0071] As shown in FIG. 7, flame arrestor 100C differs from flame arrestor 100B in that the arc-shaped flame retardant plates of flame retardant plate assembly 320 are curved in opposite directions. That is, the arc-shaped shapes of the four flame retardant plates are curved in the opposite direction to the flow direction of the medium (i.e., the direction of the arrows in the figure). Thus, central flame retardant plate 320A is positioned axially closer to flame retardant core 200, while three peripheral flame retardant plates 320B and 320C (the others not shown in FIG. 7) are positioned axially farther away from flame retardant core 200. Note that in this variation of flame arrestor 100C shown in FIG. 7, the medium flows in through outlet 120 and flows out through inlet 110.

[0072] It is easily understood that using such a flame retardant plate assembly 320, the flame arrestor 100C can achieve substantially the same technical effect as the flame arrestor 100B.

[0073] According to a structure proposed in the third modification of the first embodiment of the present invention, a flame arrester F5 for propagating propane in the atmosphere is provided. Specifically, the flame arrester F5 is the same as the flame arrester F4, except that the flame-retardant core 200 is replaced with one for resistance to propane.

[0074] In the prior art, the test pressure of the propane atmosphere is usually 1.1 bar, the instantaneous pressure of the explosion impulse is up to 92.1 bar, and the average pressure is up to 15.3 bar. In contrast, the flame arrester F5 can successfully pass the test for explosion flame resistance of the propane atmosphere with a test pressure of 1.6 bar, an instantaneous pressure of the explosion impulse of up to 131.5 bar, and an average pressure of up to 23.3 bar. This indicates that the pressure capacity of the flame arrester F5 is 52% higher than that of the prior art.

[0075] 8 shows a flame arrester 500 according to a second embodiment of the present invention. For the sake of brevity and clarity, in this embodiment, structures or components that are identical to those in the first embodiment are designated by the same reference numerals, respectively, and descriptions thereof will not be repeated here.

[0076] In a second embodiment of the present invention, a flame retardant tube 510 is used in a flame arrester 500 as a device capable of preventing the impact of a deflagration or explosion flame on the central zone of the flame retardant core. Specifically, a transition section 105 in which the flame retardant tube 510 is disposed is provided between the main body 102 and the connecting section 103 of the flame arrester housing 101. The flame retardant tube 510 is a hollow cylinder with one open end and one closed end, the former connected to the connecting section 103 and the latter facing the flame retardant core. Preferably, the diameter of the flame retardant tube 510 is selected to be equal to the diameter of the connecting section 103 to facilitate the connection therebetween. A plurality of longitudinal grid passages 520 are formed in the peripheral wall of the flame retardant tube 510. In the embodiment shown in FIG. 8, the grid passages 520 are configured as longitudinal slits.

[0077] 8, two flame retardant tubes 510 and 530 are disposed within the flame arrestor 500 symmetrically about the flame retardant core 200. However, it can be understood that a configuration including only one flame retardant tube 510 is also within the scope of the present invention.

[0078] Thus, under normal operating conditions, gas from media delivery pipeline 400 enters flame arrestor 500 through inlet 110 and connection 103 in the direction of the arrows, as shown in Figure 8, and first enters flame retardant tube 510. Because the end of the flame retardant tube facing flame retardant core 200 is a closed end, the gas also flows in the direction of the arrows through grid passages 520 in flame retardant tube 510 and into the internal cavity of flame arrestor housing 101. The gas then passes through flame retardant core 200, flame retardant tube 530, and outlet 120 before entering the other media delivery pipe (not shown).

[0079] In a flame arresting state, a deflagration or explosion flame enters the flame arrester 500 from the medium delivery pipeline 400 through the inlet 110 and the connection 103. The end of the flame retardant tube 510 facing the flame retardant core 200 is closed, so it can withstand the pressure shock from the explosion or deflagration flame. In this manner, the gas flow and the flame pass through the grid passages 520 and reach the internal cavity of the flame arrester housing 101. Due to the above-mentioned action of the flame retardant tube 510, the shear wave structure of the explosion or deflagration is damaged, and the flame propagation speed is rapidly reduced. Meanwhile, once the flame enters the internal cavity of the flame arrester housing 101, the flame's instantaneous volume expansion further reduces the flame propagation speed. In addition, because the end of the flame retardant tube 510 facing the flame retardant core 200 is closed, the gas flow and the flame must pass through the grid passages 520 radially to the peripheral region of the internal cavity of the flame arrester housing 101. Therefore, the impact of the flame on the central zone of the flame-retardant core 200 is significantly reduced. After the medium passes through the flame-retardant core 200 and further through the flame-retardant tube 530, the flame can be completely extinguished.

[0080] In particular, the inventors of the present invention surprisingly found through experiments that the flame arrester 500 according to the second embodiment of the present invention is particularly suitable for detonation flames. Tests demonstrated that after passing through the flame-retardant tube 510 of the flame arrester 500, the speed of the detonation flame rapidly decreased from its original speed of 1,800 m / s to 400-500 m / s. In other words, the detonation flame was transformed into a deflagration flame. At the same time, it was also observed that the pressure decreased from the original 12-16 bar to 2-3 bar, thus significantly reducing the impact on the flame-retardant core. Furthermore, since the flame arrester 500 according to the second embodiment of the present invention has multiple grid passages 520 formed in the sidewall of the flame-retardant tube 510, it is easy to see that the medium can still flow smoothly through the flame arrester 500. Therefore, the flame arrester 500 according to the second embodiment of the present invention not only effectively prevents detonation and deflagration, but also has high efficiency in terms of medium fluidity, compared to flame arresters of conventional structures.

[0081] According to a structure proposed in a second embodiment of the present invention, a flame arrester G1 for the propagation of ethylene in the atmosphere is provided. The flame arrester G1 includes two flame-retardant tubes arranged therein, each having a grid width of 5 mm and a length of 100 mm. The flame arrester housing 101 has a wall thickness of 3 mm. Furthermore, the flame-retardant core is a flame-retardant disc made of corrugated plate dedicated to deflagration resistance. Using the flame arrester G1, the flame-retardant tubes can destroy the shear wave structure of the explosion and convert the explosion flame into a deflagration flame. After the deflagration flame passes through the flame-retardant core, it is further weakened or even extinguished.

[0082] According to the second embodiment of the present invention, a flame-retardant tube for explosion resistance and a flame-retardant core for deflagration resistance are provided, thereby achieving the desired flame retardancy. Toward the characteristics of explosion, the flame-retardant tube as an explosion prevention unit can quickly convert an explosion into a deflagration. Furthermore, the flame-retardant core as a deflagration prevention unit has better overall fluidity and exhibits a smaller pressure drop than its counterpart in a conventional explosion-proof flame arrester. At the same time, the thickness of the flame-retardant core can be made thinner, and its overall porosity can be made greater, making it easier to clean.

[0083] 9 shows a flame arrester 500A according to a first modification of the second embodiment of the present invention. The flame arrester 500A differs from the flame arrester 500 only in the flame retardant tube. Therefore, for the sake of brevity and clarity, FIG. 9 clearly shows only the structure of the flame retardant tube, and does not clearly show other components of the flame arrester 500A. It is easily understood that all technical effects related to the flame arrester 500 are applicable to the flame arrester 500A, and the description thereof will not be repeated here.

[0084] 9, a flame retardant tube 510A of a flame arrester 500A according to a first modification of the second embodiment of the present invention has a plurality of grid passages 520A with different widths. The inventors of the present invention have found through experiments that the width of the grid passages 520A should not exceed half of the explosive shear wave structure S, and preferably should not exceed one-fourth of the explosive shear wave structure S. When the width of the grid passages 520A meets the above requirements, the flame retardant tube 510A can effectively destroy the explosive shear wave structure, and therefore can significantly attenuate the explosive flame.

[0085] According to this variation of this embodiment of the present invention, the grid passages 520A may have the same or different widths. At the same time, to enhance damage to the explosive shear wave structure, the grid passages 310 may have shapes other than straight lines, such as zigzags or arcs. Furthermore, to improve the structural strength of the flame retardant tube, the grid passages may have a discontinuous form consisting of multiple sections in addition to the continuous form shown in Figures 8 and 9. For example, in a preferred variation not shown, several grid passages spaced apart from one another are provided at different axial positions on the peripheral wall of the flame retardant tube.

[0086] FIG. 10 shows a flame arrester 500B according to a second modification of the second embodiment of the present invention. The flame arrester 500B differs from the flame arrester 500 only in the flame retardant tube. Therefore, for simplicity and clarity, FIG. 10 clearly shows only the structure of the flame retardant tube, and does not clearly show other components of the flame arrester 500B. It is easily understood that all technical effects related to the flame arrester 500 are applicable to the flame arrester 500B, and the description thereof will not be repeated here.

[0087] 10, in this modification of the present embodiment, instead of the plurality of grid passages formed in the flame-retardant tube 510B of the flame arrestor 500B, a plurality of through-holes 520B are formed in the wall of the flame-retardant tube 510B. That is, the flame-retardant tube 510B is configured as a perforated member. Therefore, a deflagration or explosion flame can enter the internal cavity of the flame arrestor through the through-holes 520B.

[0088] Through experiments, the inventors have found that when the total area of ​​the through holes 520B in the flame retardant tube 510B of the flame arrester 500B is greater than twice the cross-sectional area of ​​the medium delivery pipeline connected to the flame arrester, a very effective explosion resistance effect can be obtained.

[0089] FIG. 11 shows a flame arrester 500C according to a third modification of the second embodiment of the present invention. The flame arrester 500C differs from the flame arrester 500 only in the flame-proof and flame-retardant tube. Therefore, for the sake of brevity and clarity, FIG. 11 clearly shows only the structure of the flame-retardant tube, and does not clearly show the other components of the flame arrester 500C. It is easily understood that all technical effects related to the flame arrester 500 are applicable to the flame arrester 500C, and the description thereof will not be repeated here.

[0090] 11, in this modification of the present embodiment, several meshes 520C are formed on the peripheral wall of the flame retardant tube 510C of the flame arrester 500C. That is, the flame retardant tube 510C is configured as a mesh member. Therefore, an explosion or deflagration flame can enter the internal cavity of the flame arrester through the meshes 520C.

[0091] Similarly, the inventors of the present invention have found through experiments that when the total area of ​​the mesh 520C in the flame retardant tube 510C of the flame arrestor 500C is greater than twice the cross-sectional area of ​​the medium delivery pipeline connected to the flame arrestor, a very effective explosion resistance effect can be achieved.

[0092] 12 shows a flame arrester 500D according to a fourth modification of the second embodiment of the present invention. The flame arrester 500D differs from the flame arrester 500 only in the flame-proof and flame-retardant tube. Therefore, for the sake of brevity and clarity, FIG. 12 clearly shows only the structure of the flame-retardant tube, and does not clearly show other components of the flame arrester 500D. It is easily understood that all technical effects related to the flame arrester 500 are applicable to the flame arrester 500D, and the description thereof will not be repeated here.

[0093] 12, in a modification of this embodiment, the peripheral wall of a flame-retardant tube 510D of a flame arrestor 500D is configured to have a mesh portion 521D and a perforated portion 522D arranged adjacent to each other in the axial direction. The mesh portion 521D includes several meshes, and the perforated portion 522D includes several through-holes. Therefore, an explosion or deflagration flame can enter the internal cavity of the flame arrestor through the meshes and the through-holes.

[0094] Similarly, the inventors of the present invention have found through experiments that when the total area of ​​the mesh and through holes of the flame retardant tube 510D of the flame arrester 500D is greater than twice the cross-sectional area of ​​the medium delivery pipeline connected to the flame arrester, a very effective explosion resistance effect can be obtained.

[0095] Although FIG. 12 shows mesh portion 521D positioned upstream of perforated portion 522D in the media flow direction, it will be understood that mesh portion 521D may also be positioned downstream of perforated portion 522D.

[0096] FIG. 13 shows a flame arrester 500E according to a fifth modification of the second embodiment of the present invention. The flame arrester 500E differs from the flame arrester 500 only in the flame retardant tube. Therefore, for the sake of brevity and clarity, FIG. 13 clearly shows only the structure of the flame retardant tube, and does not clearly show other components of the flame arrester 500E. It is easily understood that all technical effects related to the flame arrester 500 are applicable to the flame arrester 500E, and the description thereof will not be repeated here.

[0097] 13, in this modification of the present embodiment, the peripheral wall of the flame-retardant tube 510E of the flame arrestor 500E is configured to have a mesh portion 521E and a perforated portion 522E arranged in order in the radial direction. The mesh portion 521E includes several meshes, and the perforated portion 522E includes several through-holes. Therefore, an explosion or deflagration flame can enter the internal cavity of the flame arrestor through the meshes and the through-holes.

[0098] Similarly, the inventors of the present invention have found through experiments that when the total area of ​​the mesh and through holes of the flame retardant tube 510E of the flame arrester 500E is greater than twice the cross-sectional area of ​​the medium delivery pipeline connected to the flame arrester, a very effective explosion resistance effect can be obtained.

[0099] Although FIG. 13 shows mesh portion 521E positioned radially inward of perforated portion 522E (i.e., perforated portion 522E enveloping mesh portion 521E), it will be understood that mesh portion 521E may also be positioned radially outward of perforated portion 522E (i.e., perforated portion 522E enveloping mesh portion 521E).

[0100] 14 shows a flame arrester 500F according to a sixth modification of the second embodiment of the present invention. The flame arrester 500F differs from the flame arrester 500 only in the flame retardant tube. Therefore, for the sake of brevity and clarity, FIG. 14 clearly shows only the structure of the flame retardant tube, and does not clearly show other components of the flame arrester 500F. It is easily understood that all technical effects related to the flame arrester 500 are applicable to the flame arrester 500F, and the description thereof will not be repeated here.

[0101] 14, in this modification of the present embodiment, flame-retardant tube 510F of flame arrestor 500F is configured as a cone rather than a cylinder. Specifically, the volume of flame-retardant tube 510F gradually increases in the axial direction toward the flame-retardant core (not shown).

[0102] In this flame arrester 500F, the flame arrester housing gradually increases in size along the direction of the medium flow, so that the gas flow and flame pass through a plurality of grid passages 520F and enter the internal cavity of the flame arrester, causing the volume to expand. The above-mentioned action of the flame-retardant tube 510F damages the explosion shear wave structure, and the volume of the flame expands instantaneously, further reducing the flame propagation speed.

[0103] According to this variant of the second embodiment of the present invention, it is easy to understand that various configurations of the flame arrestor different from a cone can be envisaged, as long as the volume of the flame arrestor gradually increases along the direction of the medium flow.

[0104] Based on the innovative concept proposed by the second embodiment of the present invention, i.e., based on the concept that the flame can be treated in stages so that it gradually weakens, the present application further proposes a flame arrester with a novel structure.

[0105] Fig. 15 shows a flame arrester 800 according to a third embodiment of the present invention. As can be seen from Fig. 15, the flame arrester housing of the flame arrester 800 according to the third embodiment of the present invention is provided with the flame retardant cylinder 510 according to the second embodiment of the present invention and the flame retardant plate assembly 300 according to the first embodiment of the present invention.

[0106] In the flame arrester 800 according to the third embodiment of the present invention, the flame-retardant tube 510 functions to reduce the speed and pressure of the detonation flame from the medium delivery pipeline, drawing the detonation flame away from the central zone of the flame-retardant core 200 and causing it to enter the peripheral region of the flame arrester housing 101 along the radial direction of the flame-retardant tube 510. In this way, the detonation flame can be effectively converted into a deflagration flame. The deflagration flame then passes through the flame-retardant plate assembly 300, which further reduces the flame speed and causes the flame to impinge more strongly on the peripheral zone of the flame-retardant core 200 than on the central zone. The flame then passes through the flame-retardant core 200 and is further weakened. Tests have shown that the flame arrester 800 according to the third embodiment of the present invention can effectively extinguish the detonation flame.

[0107] Therefore, according to the third embodiment of the present invention, the detonation flame is first introduced into the surrounding area of ​​the flame arrester housing by the flame-retardant tube and converted into a deflagration flame. The deflagration flame is then further weakened by the flame-retardant plate assembly and finally extinguished by the flame-retardant core. This embodiment is a combination of the first and second embodiments, and creatively proposes to gradually weaken the power of the detonation flame, thereby achieving a particularly satisfactory flame-resistant effect. At the same time, it is easy to see that the flame arrester according to the third embodiment of the present invention also has excellent medium flow efficiency.

[0108] Although not described in detail, a person skilled in the art can understand that in some variants of the third embodiment of the present invention (not shown), any combination of a variant of the flame retardant plate assembly according to the first embodiment of the present invention and a variant of the flame retardant tube according to the second embodiment of the present invention can be used, and this can also achieve the same technical effect as the flame arrester 800.

[0109] Although the present invention has been described above with reference to exemplary embodiments, various modifications can be made, and elements can be replaced with their equivalents without departing from the scope of the present invention. In particular, unless there is a structural contradiction, technical features described in different embodiments can be combined with each other in any way. The present invention is not limited to the specific embodiments disclosed in this specification, but includes all technical solutions falling within the scope of the claims.

Claims

1. a flame arrestor housing having an inlet and an outlet; and a flame-retardant core disposed within the flame arrestor housing; the flame arrester housing includes a flame arresting mechanism disposed between the flame-retardant core and the inlet for preventing a flame from directly impinging on a central zone of the flame-retardant core; the flame arresting mechanism comprises a flame retardant plate assembly; The flame arrester, wherein the flame retardant plate assembly comprises at least a first flame retardant plate and a second flame retardant plate spaced apart from each other in the axial direction, the first and second flame retardant plates being attached to the inner wall of the flame arrester housing in a staggered manner in the circumferential direction, and overlapping each other in a central region in a radial cross section of the flame arrester housing perpendicular to the axial direction of the flame arrester housing.

2. 2. The flame arrester according to claim 1, wherein the flame arresting mechanism comprises a flame-retardant tube having one end communicating with the inlet and the other end closed, and a medium flow passage is provided in the peripheral wall of the flame-retardant tube.

3. 3. The flame arrestor according to claim 2, wherein the passage is formed by a plurality of grids extending in the axial direction of the flame-retardant tube, the grids having different widths.

4. The flame arrestor according to claim 2 , wherein the passage is formed by a plurality of through holes arranged in the peripheral wall of the flame-retardant tube.

5. The flame arrester according to claim 2, wherein the flame-retardant tube has a perforated portion or a mesh portion, and the perforations of the perforated portion or the mesh of the mesh portion form the passage.

6. 3. The flame arrester according to claim 2, wherein the flame-retardant tube has a perforated portion and a mesh portion arranged adjacent to each other in the axial or radial direction, and the perforations of the perforated portion and the mesh of the mesh portion form the passages.

7. The flame arrestor of claim 2 , wherein the total area of ​​the passages is greater than twice the cross-sectional area of ​​a media delivery pipeline connected to the flame arrestor.

8. The flame arrester according to claim 2 , wherein the flame-retardant tube is configured so that its volume gradually increases in a direction toward the flame-retardant core.

9. The flame arrestor of claim 2 , wherein the flame arresting mechanism includes two flame-retardant tubes arranged symmetrically with respect to the flame-retardant core.

10. The flame arrester housing is formed in a cylindrical shape and is connected to the inlet and the outlet via connection portions on both sides, 3. The flame arrestor according to claim 2, wherein the flame arrestor housing has a transition portion in an area adjacent to each connection portion, and the flame retardant tube is disposed in the transition portion.

11. The flame arrestor according to claim 2 , wherein the flame retardant plate assembly is disposed between the flame retardant tube and the flame retardant core.

12. the first and second flame-retardant plates are each formed as a partially circular plate consisting of an upper arc segment and a straight segment; 2. The flame arrestor of claim 1, wherein the upper arc segments of the first and second flame retardant plates are both attached to an inner wall of the flame arrestor housing, while the straight segments of the first and second flame retardant plates are parallel to each other and extend beyond a longitudinal centerline of the flame arrestor housing.

13. 13. The flame arrestor according to claim 12, wherein an angle formed between a cross section perpendicular to an axial direction of the flame arrestor housing and each of the first and second flame-retardant plates is equal to or greater than 0 degrees and equal to or less than 45 degrees.

14. 13. The flame arrestor according to claim 12, wherein a through hole is formed in each of the first and second flame retardant plates in an area close to the inner wall of the flame arrestor housing, and an angle formed between the through hole and the longitudinal center line of the flame arrestor housing is less than 90 degrees.

15. The flame arrestor according to claim 1, wherein the flame arrestor satisfies the following relationships: 1.5d ≥ h1 ≥ d, 1.5d ≥ h2 ≥ d, D ≥ 2d, h1 > 0.5D, and h2 > 0.5D (wherein D is the diameter of the main body of the flame arrestor housing, d is the diameter of the connection portion, and h1 and h2 are the lengths of the first and second flame retardant plates projected onto the cross section of the flame arrestor housing, respectively).

16. 11. The flame arrestor according to claim 10, wherein the flame retardant plate assembly includes a central flame retardant plate arranged on an axial centerline of the flame arrestor housing and three peripheral flame retardant plates arranged in an equilateral triangle with respect to the axial centerline, and the central flame retardant plate and the peripheral flame retardant plate are each configured as an arc-shaped plate.

17. The central flame-retardant plate and the peripheral flame-retardant plates are all bent along the media flow direction, and the central flame-retardant plate is disposed forward of the peripheral flame-retardant plates in the media flow direction, or 17. The flame arrestor according to claim 16, wherein the central flame retardant plate and the peripheral flame retardant plates are all bent against the medium flow direction, and the central flame retardant plate is positioned further rearward in the medium flow direction than the peripheral flame retardant plates.

18. 17. The flame arrester according to claim 16, wherein the area of ​​a circumscribed circle of the projected images of the central flame retardant plate and the peripheral flame retardant plate on the flame retardant core is larger than the cross-sectional area of ​​the connection portion of the flame arrester housing, and the projected image of the central flame retardant plate on the flame retardant core at least partially overlaps with the projected image of the peripheral flame retardant plate on the flame retardant core.

19. 2. The flame arrestor of claim 1, wherein two flame retardant plate assemblies are disposed symmetrically within the flame arrestor housing relative to the flame retardant core.

20. a flame arrester housing having a generally cylindrical body, a connection portion connected to each end of the body, and a port connected to each connection portion, each end of the body being connected to the connection portion via a transition portion; a flame-retardant core disposed within the flame arrestor housing; a flame-retardant tube disposed at the transition portion of the body, the flame-retardant tube having a first end communicating with the port via the connecting portion and a closed second end facing the flame-retardant core, the flame-retardant tube having a passage for medium flow formed in a peripheral wall of the flame-retardant tube; and a flame arrester comprising: a flame retardant plate assembly, the flame retardant plate assembly being disposed between the flame retardant tube and the flame retardant core and comprising at least a first flame retardant plate and a second flame retardant plate spaced apart from each other in the axial direction, the first and second flame retardant plates being attached to an inner wall of the flame arrester housing in a staggered manner in the circumferential direction, and overlapping each other in a central region in a radial cross section of the flame arrester housing perpendicular to the axial direction of the flame arrester housing.

Images