A low-pressure-drop detonation flame arrester

Abstract

A low-pressure-drop detonation flame arrester includes: a first flame-arresting core, flame-arresting structural units, a shell, and a sleeve; two shells are fixedly connected to the front and rear ends of the sleeve, respectively; the first flame-arresting core is located at the circumferential center of the sleeve; flame-arresting structural units are respectively arranged upstream and downstream of the first flame-arresting core; the flame-arresting structural units are any one or more of the following: a multi-layered hole structure with concentric inner and outer fittings, a ring-shaped structure, or an axially nested multi-layered hole structure. This invention proposes a structure that can both reduce velocity and pressure during detonation and suppress the accelerated transformation of flame into an unsteady detonation wave during deflagration, while maintaining a low pressure drop.

Description

Technical Field

[0001] This invention belongs to the field of detonation flame arrester design technology, and in particular, a low-pressure-drop detonation flame arrester. Background Technology

[0002] In actual chemical production processes, the location of the ignition source is uncontrollable, and detonation flame arresters may still be tested by deflagration. Therefore, the requirement for deflagration flame arrester testing has been put forward, which poses new requirements for the design of detonation flame arresters.

[0003] The absorbing structure used in the first-generation detonation flame arresters could have negative effects under deflagration conditions: when a low-velocity combustion stream passes through narrow channels or complex structures inside the flame arrester, the turbulence intensity increases significantly, easily inducing flame acceleration and the transition from deflagration to detonation (DDT). DDT results in unsteady-state detonation, with pressure and impact far exceeding that of steady-state detonation, meaning that even flame arresters that pass steady-state detonation tests may still fail under real-world conditions. While simply increasing the number of flame arrester chips can solve the above problem, it increases the voltage drop, rendering the first-generation absorbing design meaningless. Summary of the Invention

[0004] The technical problem solved by this invention is to overcome the shortcomings of the prior art and provide a low-pressure-drop detonation flame arrester. Based on the first-generation invention, a new structural combination is added, which solves the problems of existing detonation flame arresters being unable to weaken the detonation degree, not accelerating deflagration, and having excessively high pressure drop under normal working conditions.

[0005] The technical solution of this invention is: A low-pressure-drop type detonation flame arrester includes: a first flame arresting core, a flame arresting structural unit, a shell, and a sleeve; The two housings are fixedly connected to the front and rear ends of the sleeve, respectively; The first flame arrestor core is located at the circumferential center of the sleeve; Fire-arresting structural units are respectively provided upstream and downstream of the first fire-arresting core; The fire-retardant structural unit is any one or more of the following: a multi-layer hole structure with concentric inner and outer sets, a ring structure, or an axially nested multi-layer hole structure.

[0006] Preferably, a low-pressure-drop type detonation flame arrester includes: a first flame arresting core, a second flame arresting core, a shell, and a sleeve; The two housings are fixedly connected to the front and rear ends of the sleeve, respectively; The first flame arrestor core is located at the circumferential center of the sleeve; a second flame arrestor core is provided upstream and downstream of the first flame arrestor core respectively; the second flame arrestor core is fixed inside the shell or sleeve. The first flame arrestor core is a multi-layered hole structure with concentric inner and outer layers, each layer being a unit structure; the radial cross section of each unit structure of the first flame arrestor core consists of circumferentially arranged triangular, circular, or hexagonal grid holes. The second flame arrestor core is a multi-layered hole structure with concentric inner and outer layers, each layer being a unit structure; the radial cross section of each unit structure of the second flame arrestor core consists of circumferentially arranged triangular, circular, or hexagonal grid holes.

[0007] Preferably, the maximum radial gap size of each unit structure of the first flame arrestor core is defined as the unit height value h1, and the maximum radial gap size of each unit structure of the second flame arrestor core is defined as the unit height value h2. The relationship between the unit height value h1 of the first flame arrester and the unit height value h2 of the second flame arrester is 1.2≤h2 / h1≤12.

[0008] Preferably, a low-pressure-drop type detonation flame arrester includes: a first flame arresting core, a third flame arresting core, a shell, and a sleeve; The two housings are fixedly connected to the front and rear ends of the sleeve, respectively; The first flame arrestor core is located at the circumferential center of the sleeve; a third flame arrestor core is provided upstream and downstream of the first flame arrestor core respectively; the third flame arrestor core is fixed inside the shell or sleeve. The first flame arrestor core is a multi-layered hole structure with concentric inner and outer layers, each layer being a unit structure; the radial cross section of each unit structure of the first flame arrestor core consists of circumferentially arranged triangular, circular, or hexagonal grid holes. The third flame arrestor core is a circular flame arrestor core, and the relationship between the inner diameter S of the third flame arrestor core and the inner diameter D of the shell is D≤S≤2D.

[0009] Preferably, a low-pressure-drop type detonation flame arrester includes: a first flame arresting core, a fourth flame arresting core, a shell, and a sleeve; The two housings are fixedly connected to the front and rear ends of the sleeve, respectively; The first flame arrestor core is located at the circumferential center of the sleeve; a fourth flame arrestor core is provided upstream and downstream of the first flame arrestor core respectively; the fourth flame arrestor core is fixed inside the shell or sleeve. The first flame arrestor core is a multi-layered hole structure with concentric inner and outer layers, each layer being a unit structure; the radial cross section of each unit structure of the first flame arrestor core consists of circumferentially arranged triangular, circular, or hexagonal grid holes. The fourth flame-arresting core includes: a flame-arresting medium core and an expansion chamber; The expansion chamber has an axially nested multi-layered hole structure; The expansion chamber facing the first flame arrester core has multiple concentric annular deep grooves machined as expansion sections; the bottom of each annular deep groove has concentric annular through holes machined as contraction sections. The flame-retardant medium core is placed inside the contraction section.

[0010] Preferably, the radial area A1 of the contraction section and the radial area A2 of the expansion section have a mathematical relationship: A1 / A2≤2; The maximum radial gap dimension of each unit structure of the first flame-arresting core is defined as the unit height value h1. The radial thickness h4 of the flame-arresting medium core has a mathematical relationship with the unit height value h1 of the first flame-arresting core: 1.2≤h4 / h1≤12.

[0011] Preferably, a low-pressure-drop type detonation flame arrester includes: a first flame arresting core, a second flame arresting core, a third flame arresting core, a shell, and a sleeve; The two housings are fixedly connected to the front and rear ends of the sleeve, respectively; The first flame arrestor core is located at the circumferential center of the sleeve; a second flame arrestor core and a third flame arrestor core are respectively provided upstream and downstream of the first flame arrestor core; the second flame arrestor core is located inside the sleeve, and the third flame arrestor core is fixed inside the shell or the sleeve. The first flame arrestor core is a multi-layered hole structure with concentric inner and outer layers, each layer being a unit structure; the radial cross section of each unit structure of the first flame arrestor core consists of circumferentially arranged triangular, circular, or hexagonal grid holes. The second flame arrestor core is a multi-layered hole structure with concentric inner and outer layers, each layer being a unit structure; the radial cross section of each unit structure of the second flame arrestor core consists of circumferentially arranged triangular, circular, or hexagonal grid holes. The third flame arrestor core is a circular ring-shaped flame arrestor core.

[0012] Preferably, a low-pressure-drop type detonation flame arrester includes: a first flame arresting core, a second flame arresting core, a third flame arresting core, a fourth flame arresting core, a shell, and a sleeve; The two housings are fixedly connected to the front and rear ends of the sleeve, respectively; The first flame arrestor core is located at the circumferential center of the sleeve; the second flame arrestor core, the third flame arrestor core, and the fourth flame arrestor core are respectively provided upstream and downstream of the first flame arrestor core; The second and third flame arrestor cores are located inside the sleeve, and the fourth flame arrestor core is fixed inside the housing or sleeve. The first flame arrestor core is a multi-layered hole structure with concentric inner and outer layers, each layer being a unit structure; the radial cross section of each unit structure of the first flame arrestor core consists of circumferentially arranged triangular, circular, or hexagonal grid holes. The second flame arrestor core is a multi-layered hole structure with concentric inner and outer layers, each layer being a unit structure; the radial cross section of each unit structure of the second flame arrestor core consists of circumferentially arranged triangular, circular, or hexagonal grid holes. The third flame arrestor core is a circular ring-shaped flame arrestor core; The fourth flame-arresting core includes: a flame-arresting medium core and an expansion chamber; the expansion chamber is an axially nested multi-layer hole structure; on the side of the expansion chamber facing the first flame-arresting core, multiple concentric annular deep grooves are machined as expansion sections; the bottom of each annular deep groove is machined with concentric annular through holes as contraction sections; the flame-arresting medium core is placed in the contraction section.

[0013] Preferably, the maximum radial gap size of each unit structure of the first flame arrestor core is defined as the unit height value h1, and the maximum radial gap size of each unit structure of the second flame arrestor core is defined as the unit height value h2. The relationship between the unit height value h1 of the first flame arrester and the unit height value h2 of the second flame arrester is 1.2≤h2 / h1≤12; The relationship between the inner diameter S of the third flame arrestor core and the inner diameter D of the shell is D≤S≤2D; the radial thickness h3 of the third flame arrestor core is in the range of h1≤h3≤h2. The radial area A1 of the contraction segment and the radial area A2 of the expansion segment have a mathematical relationship: A1 / A2≤2.

[0014] Preferably, the value range of the height h1 of the first flame arrestor core unit is related to the explosion level of the flammable medium, specifically: For the first flame arrestor core made of Class IIA medium, the unit height value h1 of the first flame arrestor core is in the range of 0.05mm≤h1≤0.3mm; For the first flame arrestor core made of IIB3 type medium, the unit height value h1 of the first flame arrestor core is in the range of 0.2mm≤h1≤0.6mm; For the first flame arrestor core using IIC type dielectric material, the unit height value h1 of the first flame arrestor core is in the range of 0.4mm≤h1≤1.2mm.

[0015] Compared with the prior art, the advantages of the present invention are mainly reflected in the following aspects: 1) Through the synergistic effect of the multi-level structure, the degree of detonation can be significantly reduced, and the flame propagation can be effectively blocked, thereby avoiding the risk of accidents.

[0016] 2) The structure of the present invention can reduce the acceleration trend of the flame under deflagration conditions and suppress the flame from turning into unsteady deflagration during the process of deflagration to detonation, thereby enhancing the flame arrestor's flame arresting performance under deflagration conditions.

[0017] 3) The optimized design of the flame arrestor structure makes the flow channel smooth, which can make the equipment have a lower pressure drop under normal working conditions and is conducive to the stable flow of the medium in the pipeline. Attached Figure Description

[0018] Figure 1A schematic diagram of a structure for setting a combination of a first flame arrestor core and a second flame arrestor core inside the sleeve; Figure 2 A schematic diagram of a combination of a first flame-arresting core inside the sleeve and a second flame-arresting core inside the housing; Figure 3 A schematic diagram of a structure for assembling a first and a third flame arrestor core inside the sleeve; Figure 4 A schematic diagram of a structure for assembling a first flame arrestor core, a second flame arrestor core, and a third flame arrestor core inside the sleeve; Figure 5 A schematic diagram of a structure for assembling a first and fourth flame arrestor core inside the sleeve; Figure 6 A schematic diagram showing the unit height of the flame-arresting core; Figure 7 This is a schematic diagram of the expansion chamber structure.

[0019] Figure label: 1. Housing 2. Sleeve 3. Fastener 4. First flame arrestor core 21. Second flame arrestor core 22. Third flame arrestor core 23. Fourth flame arrestor core 24. Expansion chamber 25. Contraction section 251. Expansion section 252. Detailed Implementation

[0020] To better describe the present invention, the present invention will be described in detail below with reference to schematic diagrams and examples.

[0021] The low-pressure-drop detonation flame arrester of this embodiment includes: a first flame-arresting core 21, a flame-arresting structural unit, a housing 1, a sleeve 2, and fasteners 3. Two housings 1 are respectively fixedly connected to the front and rear ends of the sleeve 2 by fasteners 3. The flame-arresting structural unit adopts a multi-stage composite structure, including: a second flame-arresting core 22, a third flame-arresting core 23, and a fourth flame-arresting core 24. Functional optimization can be achieved through combinations of different forms and numbers of flame-arresting cores.

[0022] The first flame arrestor core 21 is a multi-layered hole structure with concentric inner and outer layers, each layer being a unit structure; the maximum radial gap size of each unit structure is defined as the unit height value h1, and the range of the unit height value h1 is related to the explosion degree of the flammable medium: For the first flame arrestor core 21 made of Class IIA medium, the unit height value h1 of the first flame arrestor core 21 is in the range of 0.05mm≤h1≤0.3mm, and preferably the unit height value h1 of the first flame arrestor core 21 is in the range of 0.15mm≤h1≤0.2mm. For the first flame arrestor core 21 made of IIB3 type medium, the unit height value h1 of the first flame arrestor core 21 is in the range of 0.2mm≤h1≤0.6mm, and preferably the unit height value h1 of the first flame arrestor core 21 is in the range of 0.3mm≤h1≤0.5mm. For the first flame arrestor core 21 made of IIC type medium, the unit height value h1 of the first flame arrestor core 21 is in the range of 0.4mm≤h1≤1.2mm, and preferably the unit height value h1 of the first flame arrestor core 21 is in the range of 0.5mm≤h1≤0.8mm.

[0023] The first flame-arresting core 21 is the main flame-arresting structural unit, located in the circumferential center of the sleeve 2. The radial cross section of each unit structure of the first flame-arresting core 21 consists of circumferentially arranged triangular, circular, or hexagonal grid holes; the first flame-arresting core 21 can also be designed as a porous medium structure.

[0024] The second flame-arresting core 22 has the same structure as the first flame-arresting core 21, both being multi-layered hole structures with concentric inner and outer fittings, each layer serving as a unit structure. The maximum radial gap size of each unit structure is defined as the unit height value h2, and the unit height value h2 of the second flame-arresting core 22 is greater than the unit height value h1 of the first flame-arresting core 21. The range of the unit height value h2 of the second flame-arresting core 22 is related to the unit height value h1 of the first flame-arresting core 21. The range of the unit height value h2 of the second flame-arresting core 22 is 1.2 ≤ h2 / h1 ≤ 12, and preferably the range of the unit height value h2 of the second flame-arresting core 22 is 1.5 ≤ h2 / h1 ≤ 6.

[0025] The third flame arrestor core 23 is a circular flame arrestor core, and its inner diameter S is related to the inner diameter D of the shell 1 in the form D≤S≤2D. The radial thickness h3 of the third flame arrestor core 23 is related to the unit height h1 of the first flame arrestor core 21 and the unit height h2 of the second flame arrestor core 22. The radial thickness h3 of the third flame arrestor core 23 is in the range of h1≤h3≤h2.

[0026] The fourth flame arrestor core 24 includes: a flame arrestor medium core and an expansion chamber 25; The expansion chamber 25 is an axially arranged multi-layer hole structure, and the material of the expansion chamber 25 is stainless steel.

[0027] In the multi-layer hole structure of the expansion chamber 25, each layer of hole structure is machined with multiple concentric annular deep grooves on the side facing the first flame arrestor core 21 as expansion section 252, and the radial area of ​​expansion section 252 is A2.

[0028] like Figure 7As shown, each annular deep groove has concentrically arranged annular through holes at its bottom as a contraction section 251, and the radial area of ​​the contraction section 251 is A1. That is, the expansion chamber 25 is located on the side of each layer of hole structure away from the first flame arrestor core 21.

[0029] The radial area A1 of the contraction segment 251 and the radial area A2 of the expansion segment have a mathematical relationship: A1 / A2≤2.

[0030] The flame-arresting medium core is placed inside the contraction section 251. The radial thickness h4 of the flame-arresting medium core is related to the unit height h1 of the first flame-arresting core 21. The radial thickness h4 of the flame-arresting medium core is in the range of 1.2≤h4 / h1≤12. Preferably, the radial thickness h4 of the flame-arresting medium core is in the range of 1.5≤h4 / h1≤6.

[0031] A medium flow channel is formed between the housings 1. The flame-arresting structural unit is disposed in or constitutes part of the medium flow channel, and is fixedly connected by several fasteners 3. The first flame-arresting core 21 can absorb the reflected pressure wave, thereby enhancing the deceleration effect and achieving the purpose of flame arrest. Other flame-arresting core structures can achieve the effects of deceleration and pressure reduction by throttling and weakening the reflection of pressure waves.

[0032] In the combination of different multi-stage composite flame-arresting element designs, the first flame-arresting core 21 is essential, that is, the flame-arresting unit structure includes at least the first flame-arresting core 21 arranged in the sleeve 2. Combination methods include: first flame-arresting core 21, first flame-arresting core 21 + second flame-arresting core 22, first flame-arresting core 21 + third flame-arresting core 23, first flame-arresting core 21 + fourth flame-arresting core 24, first flame-arresting core 21 + second flame-arresting core 22 + third flame-arresting core 23, and first flame-arresting core 21 + second flame-arresting core 22 + third flame-arresting core 23 + fourth flame-arresting core 24.

[0033] The first flame arrestor core 21 and the second flame arrestor core 22 can be used individually or multiple units can be arranged along the axial direction. The unit height value can be the characteristic height value of the cross section being a closely packed triangular, circular or hexagonal grid hole, other irregular structure or porous medium structure. Figure 6 This is a schematic diagram showing the unit height h when the unit structure is triangular.

[0034] Example of a product implementation of the present invention Figure 1 As shown, the low-pressure-drop type detonation flame arrester includes: a first flame arresting core 21, a second flame arresting core 22, a housing 1, a sleeve 2, and fasteners 3. The first flame arresting core 21 and the second flame arresting core 22 are both disposed in the sleeve 2, and the second flame arresting core 22 and the first flame arresting core 21 are arranged in a front-to-back relationship in the direction of medium flow.

[0035] Example of a product implementation of the present invention Figure 2As shown, the low-pressure-drop type detonation flame arrester includes: a first flame arresting core 21, a second flame arresting core 22, a housing 1, a sleeve 2, and fasteners 3. The second flame arresting core 22 is disposed in the housing 1, and the second flame arresting core 22 and the first flame arresting core 21 are arranged in a front-to-back relationship in the direction of medium flow.

[0036] Example of a product implementation of the present invention Figure 3 As shown, the low-pressure-drop type detonation flame arrester includes: a first flame arresting core 21, a third flame arresting core 23, a housing 1, a sleeve 2, and fasteners 3. The first flame arresting core 21 and the third flame arresting core 23 are both disposed in the sleeve 2, and the third flame arresting core 23 and the first flame arresting core 21 are arranged in a front-to-back relationship in the direction of medium flow.

[0037] Example of a product implementation of the present invention Figure 4 As shown, the low-pressure-drop detonation flame arrester includes: a first flame arresting core 21, a second flame arresting core 22, a third flame arresting core 23, a housing 1, a sleeve 2, and fasteners 3. The third flame arresting core 23 can be disposed in the sleeve 2 or the housing 1, located upstream and downstream of the first flame arresting core 21 and the second flame arresting core 22 in the direction of medium flow. The second flame arresting core 22 and the third flame arresting core 23 are respectively disposed upstream and downstream of the first flame arresting core 21, with the third flame arresting core 23 located outside the first flame arresting core 21 and the second flame arresting core 22. When the flame enters the flame arrester, the third flame arresting core 23 first causes the shock wave and flame to diffuse and initially attenuate, reducing the energy density; secondly, the pressure wave continues to be consumed when flowing through the second flame arresting core 22, and the turbulence intensity is suppressed; finally, the weaker pressure wave and flame reach the first flame arresting core 21, where the dense flame arresting core completely cuts off the flame propagation and absorbs the rebound energy.

[0038] Example of a product implementation of the present invention Figure 5 As shown, the low-pressure-drop type detonation flame arrester includes: a first flame arresting core 21, a fourth flame arresting core 24, a housing 1, a sleeve 2, and fasteners 3; the first flame arresting core 21 is placed in the middle of the sleeve 2, and the fourth flame arresting core 24 can be set in the sleeve 2 or the housing 1, with the expansion section in the fourth flame arresting core 24 facing the first flame arresting core 21.

[0039] The low-pressure-drop type detonation flame arrester in one embodiment of the present invention includes: a first flame arresting core 21, a second flame arresting core 22, a third flame arresting core 23, a fourth flame arresting core 24, a housing 1, a sleeve 2, and fasteners 3; the first flame arresting core 21 is placed in the middle of the sleeve 2, and the second flame arresting core 22, the third flame arresting core 23, and the fourth flame arresting core 24 are arranged sequentially from the inside to the outside on both sides of the first flame arresting core 21.

[0040] This invention proposes a structure that can reduce velocity and pressure during detonation and suppress the acceleration of flame into an unsteady detonation wave during combustion, while maintaining a low pressure drop.

[0041] While the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the invention. Any person skilled in the art can make possible variations and modifications to the technical solutions of the present invention using the disclosed methods and techniques without departing from the spirit and scope of the invention. Therefore, any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention, without departing from the content of the technical solutions of the present invention, shall fall within the protection scope of the present invention. Where there is no conflict, the embodiments of this application and the technical features thereof can be combined with each other.

[0042] The contents not described in detail in this specification are common knowledge to those skilled in the art.

Claims

1. A low-pressure-drop detonation flame arrester, characterized in that, include: The first flame arrestor core (21), the flame arrestor structural unit, the shell (1) and the sleeve (2); The two housings (1) are fixedly connected to the front and rear ends of the sleeve (2), respectively; The first flame arrestor core (21) is located in the circumferential center of the sleeve (2); Fire-arresting structural units are respectively provided upstream and downstream of the first fire-arresting core (21); The fire-retardant structural unit is any one or more of the following: a multi-layer hole structure with concentric inner and outer sets, a ring structure, or an axially nested multi-layer hole structure.

2. A low-pressure-drop detonation flame arrester, characterized in that, include: First flame arrestor core (21), second flame arrestor core (22), housing (1) and sleeve (2); The two housings (1) are fixedly connected to the front and rear ends of the sleeve (2), respectively; The first flame arrestor core (21) is located in the center of the circumference of the sleeve (2); a second flame arrestor core (22) is provided upstream and downstream of the first flame arrestor core (21); the second flame arrestor core (22) is fixed inside the housing (1) or the sleeve (2); The first flame arrestor core (21) is a multi-layer hole structure with concentric inner and outer layers, each layer being a unit structure; the radial section of each unit structure of the first flame arrestor core (21) consists of circumferentially arranged triangular, circular or hexagonal holes. The second flame arrestor core (22) is a multi-layer hole structure with concentric inner and outer layers, each layer being a unit structure; the radial section of each unit structure of the second flame arrestor core (22) consists of circumferentially arranged triangular, circular or hexagonal holes.

3. A low-pressure-drop detonation flame arrester according to claim 2, characterized in that, Define the maximum gap size in the radial direction of each unit structure of the first flame arrestor core (21) as the unit height value h1, and define the maximum gap size in the radial direction of each unit structure of the second flame arrestor core (22) as the unit height value h2; The relationship between the unit height value h1 of the first flame arrester core (21) and the unit height value h2 of the second flame arrester core (22) is 1.2≤h2 / h1≤12.

4. A low-pressure-drop detonation flame arrester, characterized in that, include: First flame arrestor core (21), third flame arrestor core (23), housing (1) and sleeve (2); The two housings (1) are fixedly connected to the front and rear ends of the sleeve (2), respectively; The first flame arrestor core (21) is located in the circumferential center of the sleeve (2); a third flame arrestor core (23) is provided upstream and downstream of the first flame arrestor core (21); the third flame arrestor core (23) is fixed inside the housing (1) or the sleeve (2); The first flame arrestor core (21) is a multi-layer hole structure with concentric inner and outer layers, each layer being a unit structure; the radial section of each unit structure of the first flame arrestor core (21) consists of circumferentially arranged triangular, circular or hexagonal holes. The third flame arrestor core (23) is a circular flame arrestor core. The relationship between the inner diameter S of the third flame arrestor core (23) and the inner diameter D of the shell (1) is D≤S≤2D.

5. A low-pressure-drop detonation flame arrester, characterized in that, include: First flame arrestor core (21), fourth flame arrestor core (24), housing (1) and sleeve (2); The two housings (1) are fixedly connected to the front and rear ends of the sleeve (2), respectively; The first flame arrestor core (21) is located in the center of the circumference of the sleeve (2); a fourth flame arrestor core (24) is provided upstream and downstream of the first flame arrestor core (21); the fourth flame arrestor core (24) is fixed inside the shell (1) or the sleeve (2); The first flame arrestor core (21) is a multi-layer hole structure with concentric inner and outer layers, each layer being a unit structure; the radial section of each unit structure of the first flame arrestor core (21) consists of circumferentially arranged triangular, circular or hexagonal holes. The fourth flame arrestor core (24) includes: a flame arrestor medium core and an expansion chamber (25); The expansion chamber (25) is an axially arranged multi-layer hole structure; In the multi-layer hole structure, each layer of hole structure has multiple concentric annular deep grooves on the side facing the first flame arrestor core (21) as expansion sections (252); each annular deep groove has concentric annular through holes at the bottom as contraction sections (251). The flame-retardant medium core is placed inside the contraction section (251).

6. A low-pressure-drop detonation flame arrester according to claim 5, characterized in that, The radial area A1 of the contraction segment (251) and the radial area A2 of the expansion segment (252) have a mathematical relationship: A1 / A2≤2; Define the maximum gap size in the radial direction of each unit structure of the first fire-arresting core (21) as the unit height value h1. The range of the radial thickness h4 of the fire-arresting medium core is mathematically related to the unit height value h1 of the first fire-arresting core (21): 1.2≤h4 / h1≤12.

7. A low-pressure-drop type detonation flame arrester, characterized in that, include: The first flame arrestor core (21), the second flame arrestor core (22), the third flame arrestor core (23), the housing (1), and the sleeve (2); The two housings (1) are fixedly connected to the front and rear ends of the sleeve (2), respectively; The first flame arrestor (21) is located in the center of the circumference of the sleeve (2); the second flame arrestor (22) and the third flame arrestor (23) are respectively provided upstream and downstream of the first flame arrestor (21); the second flame arrestor (22) is located inside the sleeve (2), and the third flame arrestor (23) is fixed inside the shell (1) or the sleeve (2); The first flame arrestor core (21) is a multi-layer hole structure with concentric inner and outer layers, each layer being a unit structure; the radial section of each unit structure of the first flame arrestor core (21) consists of circumferentially arranged triangular, circular or hexagonal holes. The second flame arrestor core (22) is a multi-layer hole structure with concentric inner and outer layers, each layer being a unit structure; the radial section of each unit structure of the second flame arrestor core (22) consists of circumferentially arranged triangular, circular or hexagonal holes; The third flame arrestor core (23) is a circular flame arrestor core.

8. A low-pressure-drop type detonation flame arrester, characterized in that, include: First flame arrestor core (21), second flame arrestor core (22), third flame arrestor core (23), fourth flame arrestor core (24), housing (1) and sleeve (2); The two housings (1) are fixedly connected to the front and rear ends of the sleeve (2), respectively; The first flame arrestor core (21) is located in the center of the circumference of the sleeve (2); the second flame arrestor core (22), the third flame arrestor core (23) and the fourth flame arrestor core (24) are respectively provided upstream and downstream of the first flame arrestor core (21). The second flame arrestor core (22) and the third flame arrestor core (23) are located inside the sleeve (2), and the fourth flame arrestor core (24) is fixed inside the housing (1) or the sleeve (2); The first flame arrestor core (21) is a multi-layer hole structure with concentric inner and outer layers, each layer being a unit structure; the radial section of each unit structure of the first flame arrestor core (21) consists of circumferentially arranged triangular, circular or hexagonal holes. The second flame arrestor core (22) is a multi-layer hole structure with concentric inner and outer layers, each layer being a unit structure; the radial section of each unit structure of the second flame arrestor core (22) consists of circumferentially arranged triangular, circular or hexagonal holes; The third flame arrestor core (23) is a circular flame arrestor core; The fourth flame arrestor core (24) includes: a flame arrestor medium core and an expansion chamber (25); the expansion chamber (25) is an axially nested multi-layer hole structure; the side of the expansion chamber (25) facing the first flame arrestor core (21) is machined with multiple concentric annular deep grooves as expansion sections (252); the bottom of each annular deep groove is machined with concentric annular through holes as contraction sections (251); the flame arrestor medium core is placed in the contraction section (251).

9. A low-pressure-drop detonation flame arrester according to claim 8, characterized in that, Define the maximum gap size in the radial direction of each unit structure of the first flame arrestor core (21) as the unit height value h1, and define the maximum gap size in the radial direction of each unit structure of the second flame arrestor core (22) as the unit height value h2; The relationship between the unit height value h1 of the first flame arrester core (21) and the unit height value h2 of the second flame arrester core (22) is 1.2≤h2 / h1≤12; The relationship between the inner diameter S of the third flame arrestor core (23) and the inner diameter D of the shell (1) is D≤S≤2D; the radial thickness h3 of the third flame arrestor core (23) is in the range of h1≤h3≤h2; The radial area A1 of the contraction segment (251) and the radial area A2 of the expansion segment have a mathematical relationship: A1 / A2≤2.

10. A low-pressure-drop detonation flame arrester according to any one of claims 2-9, characterized in that, The maximum radial gap dimension of each unit structure of the first flame arrester (21) is defined as the unit height value h1. The range of the unit height value h1 of the first flame arrester (21) is related to the explosion level of the combustible medium, specifically: For the first flame arrestor core (21) made of Class IIA medium, the unit height value h1 of the first flame arrestor core (21) is in the range of 0.05mm≤h1≤0.3mm; For the first flame arrestor core (21) made of IIB3 type medium, the unit height value h1 of the first flame arrestor core (21) is in the range of 0.2mm≤h1≤0.6mm; For the first flame arrestor core (21) made of IIC type medium, the unit height value h1 of the first flame arrestor core (21) is in the range of 0.4mm≤h1≤1.2mm.

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