Fire retardant device

Abstract

The invention provides a fire retardant device which comprises a deflagration-resistant channel, a first fire retardant unit and a second deflagration-resistant channel. The detonation-resistant channel is communicated with one side of the detonation-resistant channel in parallel, and a second fire-resistant unit is arranged in the detonation-resistant channel; wherein the porosity of the first fire-retardant unit is larger than that of the second fire-retardant unit, and the fire-retardant device is constructed to enable fluid to flow through the deflagration-resistant channel under the normal working condition, and when deflagration flames approach, the deflagration-resistant channel is kept open, and the deflagration-resistant channel is kept closed. Therefore, detonation flames are prevented through the first fire-retardant unit, the detonation-resistant channel is automatically closed and opened when the detonation flames approach, and the detonation flames are prevented through the second fire-retardant unit.

Description

Technical Field

[0001] The invention belongs to the technical field of fire prevention and explosion suppression, and specifically relates to a fire prevention device, in particular to a fire prevention device used in a combustible gas transportation channel. Background Art

[0002] In the process of production, transportation and use of combustible gas, due to various uncertain factors, combustible gas is very likely to explode or detonate in the closed transportation pipeline, causing loss of life and property. In order to prevent the spread of the flame of the combustible gas in the pipeline and the explosion induced by backfire, flame arresters are usually installed on the gas transmission pipeline to ensure that the industrial equipment is working normally and prevent explosion damage caused by accidental fire.

[0003] Flame arresters are usually divided into deflagration-proof and detonation-proof types. Due to the uncertainty in the flame combustion process, deflagration flames may appear in the pipes equipped with deflagration-proof flame arresters, while the deflagration-proof flame arresters may not be able to prevent the deflagration from spreading. At this time, the flame arrester is very likely to fail to block the flame. The deflagration flame will ignite the combustible gas in the other end of the pipe through the flame arrester unit, eventually causing a serious explosion accident. Secondly, since the porosity of the fire arrester unit in the deflagration-proof flame arrester is small and the number of installed layers is large, the fluid will produce a large pressure loss after flowing through the deflagration-proof flame arrester, affecting the fluid delivery efficiency and the action of the subsequent actuator.

[0004] Most of the existing detonation flame arresters have the problem that they can effectively prevent detonation flames but cannot prevent deflagration flames. At the same time, detonation flame arresters have the disadvantage of a large pressure drop.

[0005] Therefore, there is an urgent need for an efficient fire-blocking device with simple structure, low pressure drop and reliable performance. Summary of the invention

[0006] In response to the technical problems mentioned above, the present invention aims to propose a fire-arresting device, which achieves the best fire-arresting effect by setting two circulation channels so that different types of combustion flames flow through different channels. The fire-arresting device can block both detonation flames and deflagration flames. Secondly, the fluid passes through the deflagration and combustion-proof channel during normal circulation, and the deflagration and combustion-proof channel has lower pressure loss than the detonation and combustion-proof channel.

[0007] To this end, according to the present invention, a fire arresting device is provided, comprising:

[0008] An anti-explosion and flame-retardant channel, wherein a first fire-retardant unit is provided inside the channel;

[0009] A detonation-proof channel connected in parallel to one side of the deflagration-proof channel, wherein a second flame-proof unit is arranged inside the channel;

[0010] The porosity of the first fire-blocking unit is greater than the porosity of the second fire-blocking unit.

[0011] The flame arresting device is configured to allow fluid to flow through the deflagration-resistant passage under normal operating conditions.

[0012] When a deflagration flame approaches, the deflagration-proof passage is kept open and the detonation-proof passage is kept closed, thereby preventing the deflagration flame through the first flame-blocking unit.

[0013] When a detonation flame approaches, the deflagration-blocking passage is automatically closed and the detonation-blocking passage is opened, thereby preventing the detonation flame through the second flame-blocking unit.

[0014] A further improvement of the present invention is that the deflagration-proof passage comprises a deflagration-proof flame arrester, two deflagration-proof flow channel bodies symmetrically arranged at both ends of the deflagration-proof flame arrester, and the first flame arrester unit is arranged in the deflagration-proof flame arrester;

[0015] The anti-deflagration flow channel body is configured to remain open under normal operating conditions and when a deflagration flame approaches, and to automatically close when a detonation flame approaches.

[0016] A further improvement of the present invention is that the anti-explosion and flame-retardant flow channel body comprises:

[0017] a first shell;

[0018] An anti-explosion retardant baffle plate is disposed in the first shell, and the anti-explosion retardant baffle plate is rotatably connected to the inner wall of the first shell;

[0019] a first baffle limiting frame formed on the inner wall of the first shell; and

[0020] The anti-explosion and retardant baffle is in an open state under normal working conditions and when a deflagration flame approaches, and in the open state, the anti-explosion and retardant baffle is kept lifted to open the anti-explosion and retardant flow channel body;

[0021] When a detonation flame approaches, a precursor impact force will arrive before the detonation flame, and the precursor impact force pushes the anti-explosion baffle to rotate from an open state to a closed state. In the closed state, the anti-explosion baffle is fitted with the first baffle limit frame to close the anti-explosion flow channel body.

[0022] A further improvement of the present invention is that the angle between the plane where the first baffle limiting frame is located and the cross section of the first shell is not greater than 45°.

[0023] A further improvement of the present invention is that the first baffle limit frame is provided with a first hinge, the explosion-proof and retardant baffle is provided with a first rotating shaft, the first rotating shaft is rotatably connected with the first hinge, and a first limit block for limiting the lifting angle of the explosion-proof and retardant baffle is provided at the position of the first hinge.

[0024] A further improvement of the present invention is that the side wall of the first housing is provided with a position indicating unit, which comprises:

[0025] An indicating rod rotating shaft penetrating through the side wall of the first flow channel housing and fixedly connected to the first rotating shaft;

[0026] A position indicating rod vertically connected to the axial outer end of the indicating rod rotating shaft;

[0027] The position indicating rod and the anti-explosion and retardant baffle are located in the same plane, and the rotation position of the anti-explosion and retardant baffle can be displayed by the position indicating rod.

[0028] A further improvement of the present invention is that the outer wall of the first housing is provided with a locking unit close to the position indicating unit.

[0029] The locking unit is configured to be able to lock and unlock with the position indicating rod; when the locking unit is locked with the position indicating rod, the position of the anti-explosion and flammable baffle is fixed.

[0030] A further improvement of the present invention is that the locking unit on the outer wall of the first shell includes a closing locking unit, and when the position indicating rod is locked with the closing locking unit, the explosion-proof and flame-retardant baffle is in a closed state.

[0031] A further improvement of the present invention is that the locking unit on the outer wall of the first shell further includes an opening locking unit, the position indicating rod is initially in a locked state with the opening locking unit, and the explosion-proof and flame-retardant baffle is in an open state;

[0032] During the process of the explosion-proof baffle rotating from the open state to the closed state, the position indicating rod can rotate accordingly until the opening locking unit is disengaged, and move to the position of the closing locking unit and lock with the closing locking unit.

[0033] A further improvement of the present invention is that a first magnetic attraction mechanism is provided on the first baffle limit frame; when the anti-explosion retardant baffle rotates from an open state to a closed state, the anti-explosion retardant baffle is connected to the first magnetic attraction mechanism through magnetic attraction, thereby closing the anti-explosion retardant flow channel body.

[0034] A further improvement of the present invention is that a counterweight is provided on the position indicating rod, and the gravity of the counterweight is applied to the position indicating rod, thereby driving the explosion-proof and flame-retardant baffle to be lifted and kept in an open state.

[0035] A further improvement of the present invention is that the detonation-proof channel comprises a detonation-proof flame arrester, two detonation-proof flow channel bodies symmetrically arranged at both ends of the detonation-proof flame arrester, and the second flame arrester unit is arranged in the detonation-proof flame arrester;

[0036] The detonation-proof flow channel body is constructed so as to remain closed under normal operating conditions and when a deflagration flame approaches, and to automatically open when a detonation flame approaches.

[0037] A further improvement of the present invention is that the detonation-proof flow channel body comprises:

[0038] A second shell, one end of which is provided with a transition cavity for forming communication with a side portion of the second shell;

[0039] a detonation-proof baffle plate disposed in the second shell, the detonation-proof baffle plate being rotatably connected to the inner wall of the second shell;

[0040] A second baffle limiting frame formed on the inner wall of the second shell;

[0041] Among them, the detonation-proof baffle is fitted with the second baffle limit frame under normal operating conditions and when a deflagration flame approaches, and is in a closed state to close the detonation-proof flow channel body. When a detonation flame approaches, it is lifted or lowered under the action of the precursor impact force to open the detonation-proof flow channel body. The detonation-proof baffle is lifted to be in a first open state, and is in a second open state when it is lowered.

[0042] A further improvement of the present invention is that the second baffle limiting frame is provided with a second hinge, the detonation-proof baffle is provided with a second rotating shaft, and the second rotating shaft is rotatably connected to the second hinge.

[0043] A further improvement of the present invention is that the side wall of the second shell is provided with the position indicating unit for displaying the rotation position of the detonation-arresting baffle.

[0044] A further improvement of the present invention is that the locking unit close to the position indicating unit is further provided on the outer wall of the second shell, and the detonation-proof baffle can be locked and reset by the locking unit;

[0045] Wherein, the locking unit includes a first open locking unit and a second open locking unit. When the first open locking unit is locked with the position indicating unit, the detonation-proof baffle is in a first open state; when the second open locking unit is locked with the position indicating unit, the detonation-proof baffle is in a second open state.

[0046] A further improvement of the present invention is that a closing and locking unit is further provided on the outer wall of the second shell, and initially the closing and locking unit and the position indicating unit are in a locked state, and the explosion-proof and flame-retardant baffle is in a closed state;

[0047] During the process of the explosion-proof baffle rotating from a closed state to a first open state or a second open state, the position indicating rod can rotate accordingly until the closed locking unit disengages and moves to the position of the first open locking unit or the second open locking unit, and the first open locking unit or the second open locking unit is locked.

[0048] A further improvement of the present invention is that a second magnetic attraction mechanism is provided on the second baffle limiting frame, and initially the explosion-proof and flame-retardant baffle is in a closed state and is connected to the second magnetic attraction mechanism through magnetic attraction.

[0049] A further improvement of the present invention is that a third magnetic attraction mechanism is provided on the inner side of the second shell, and the detonation-proof baffle is connected to the third magnetic attraction mechanism when it is lifted, and the detonation-proof baffle is placed in a first open state.

[0050] A further improvement of the present invention is that a counterweight block is provided at the end of the position indicating rod on the position indicating unit on the second shell; when the precursor impact force pushes the detonation-proof baffle to move to the second open state, the counterweight block maintains the detonation-proof baffle in the second open state through the action of gravity.

[0051] A further improvement of the present invention is that the locking unit comprises:

[0052] A locking shell fixedly connected to the outer wall surface of the first shell;

[0053] A retractable locking rod disposed in the locking housing, wherein the outer end of the locking rod is provided with a mating contact surface; and

[0054] an elastic return member disposed between the inner end of the locking rod and the first housing;

[0055] The position indicating rod is moved to the position where the locking rod is located, so that the locking rod is compressed and rotated past the position of the locking rod, and the locking rod can pop out after the position indicating rod passes through to lock the position indicating rod.

[0056] The anti-explosion and flame-retardant damper can be reset by pressing the locking rod and reversing the position indicating rod.

[0057] A further improvement of the present invention is that the deflagration and flame arrester comprises:

[0058] Tubular housing;

[0059] a placement cavity formed in the tubular housing, for arranging the first fire-blocking unit;

[0060] The connecting flanges arranged at the axial ends of the tubular shell are used to connect the explosion-proof and flame-retardant flow channel body.

[0061] A further improvement of the present invention is that the tubular shell is partially cut along the circumferential direction to form an installation opening for installing the first fire-blocking unit, the circumferential extension length of the installation opening is greater than half of the circumference of the tubular shell, and a removable sealing cover is provided at the installation opening.

[0062] A further improvement of the present invention is that a first connection portion is provided at a circumferential end of the sealing cover plate, and a second connection portion capable of being adapted to be connected to the first connection portion is provided at a circumferential end of the mounting opening.

[0063] The first connection portion is fastened to the second connection portion via a fastening assembly, so that the sealing cover plate is tightly connected to the tubular housing.

[0064] A further improvement of the present invention is that a limiting portion is provided at the axial end of the installation opening for limiting the first fire-blocking unit, and the axial end of the sealing cover plate can form a sealing connection with the limiting portion.

[0065] A further improvement of the present invention is that the detonation-proof flame arrester is constructed to have the same structure as the deflagration-proof flame arrester.

[0066] Compared with the prior art, the advantages of this application are:

[0067] The fire arrester device according to the present invention can block the detonation flame and the deflagration flame at the same time. It sets two flow channels, namely the deflagration-proof channel and the detonation-proof channel. Under normal working conditions, the fire arrester device can make the fluid flow through the deflagration-proof channel. When the deflagration flame approaches, the deflagration-proof channel is kept open while the detonation-proof channel is kept closed, thereby blocking the deflagration flame through the deflagration-proof channel. When the detonation flame approaches, the deflagration-proof channel can be automatically closed while the detonation-proof channel is opened, thereby blocking the detonation flame through the detonation-proof channel, thereby making different types of combustion flames flow through different channels, achieving the best fire-blocking effect. Secondly, during the normal circulation of the fluid, the fluid passes through the deflagration-proof channel. Since the porosity of the first fire-blocking unit in the deflagration-proof channel is greater than the porosity of the second fire-blocking unit in the detonation-proof channel, the deflagration-proof channel has a lower pressure loss than the detonation-proof channel, thereby achieving a low pressure drop, which can effectively ensure the fire-blocking and explosion-suppressing performance of the fire arrester device and significantly enhance the reliability of the fire arrester device. In addition, when the corresponding fire arrester unit of the deflagration and explosion arrester needs to be replaced, there is no need to dismantle the pipeline. You only need to open the sealing cover, replace the fire arrester unit and reinstall the sealing cover. The installation is simple and convenient, which greatly improves the efficiency of fire arrester unit replacement and reduces maintenance costs. In addition, the channel fire arrester can also achieve two-way fire arresting. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] The present invention will be described below with reference to the accompanying drawings.

[0069] Figure 1 The structure of the flame arrester according to the present invention is schematically shown.

[0070] Figure 2 Schematically shows Figure 1 The structure of the anti-explosion and flame-retardant flow channel body in the flame-retardant device shown.

[0071] Figure 3 Schematically shows Figure 2 The deflagration-resistant flow passage body is shown in the open state.

[0072] Figure 4 Schematically shows Figure 2 The closed state of the anti-deflagration flow channel body is shown.

[0073] Figure 5 Schematically shows Figure 2 The structural schematic diagram of the anti-explosion and flame-retardant flow channel body shown shows the structure of setting the counterweight block.

[0074] Figure 6 Schematically shows Figure 2 The structural diagram of the explosion-proof and flame-retardant flow channel body shown in FIG. 1 shows the structure of the counterweight block and the locking unit.

[0075] Figure 7Schematically shows Figure 1 The structure of the deflagration-resistant flame arrester (detonation-resistant flame arrester) in the flame arresting device shown.

[0076] Figure 8 Schematically shows Figure 1 The structure of the detonation-proof flow channel body in the flame-proof device shown.

[0077] Fig. 9 The closed state of the detonation-arresting flow channel body of one embodiment is schematically shown.

[0078] Fig.10 The open state of the detonation-arresting flow channel body of one embodiment is schematically shown.

[0079] Fig.11 The structure of the position indicating unit and the locking unit is schematically shown.

[0080] Fig.12 The closed state of the detonation-proof flow channel body of an embodiment is schematically shown, showing the structure of setting the second magnetic attraction mechanism.

[0081] Fig.13 The closed state of the detonation-proof flow channel body of an embodiment is schematically shown, and the structure of the third magnetic attraction mechanism and the counterweight block is shown.

[0082] Fig.14 The structure of the position indicating unit and the locking unit is schematically shown.

[0083] Fig.15 The structure of a deflagration-resistant barrier (detonation-resistant barrier) is schematically shown.

[0084] In the present application, all drawings are schematic drawings, which are only used to illustrate the principles of the present invention and are not drawn according to the actual scale. DETAILED DESCRIPTION

[0085] The present invention will be described below with reference to the accompanying drawings.

[0086] In this application, it should be noted that the directional terms or qualifiers "upper", "lower", etc. used in this application are all directed to the attached drawings to which they are referred. Figure 1 The above description is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0087] Figure 1 The structure of the fire arresting device 100 according to the present invention is schematically shown. Figure 1As shown, the fire arrester 100 includes a deflagration-proof channel 101 and a detonation-proof channel 201. A first fire arrester unit (not shown) is provided inside the deflagration-proof channel 101. The detonation-proof channel 201 is connected in parallel to one side of the deflagration-proof channel 101, and a second fire arrester unit (not shown) is provided inside the detonation-proof channel 201. The porosity of the first fire arrester unit is greater than the porosity of the second fire arrester unit. Under normal operating conditions, the fire arrester 100 enables fluid to flow through the deflagration-proof channel 101. When a deflagration flame approaches, the fire arrester 100 keeps the deflagration-proof channel 101 open and the detonation-proof channel 201 closed, thereby preventing the deflagration flame through the first fire arrester unit. When a detonation flame approaches, a precursor shock wave will arrive before the detonation flame. The impact force brought by the precursor shock wave is larger than the pressure of the deflagration flame. The flame arrester 100 can automatically close the deflagration prevention channel 101 and open the detonation prevention channel 201 under the action of the precursor impact force, thereby blocking the detonation flame through the second fire arrester unit.

[0088] In actual application, the fire-blocking device 100 according to the present invention is connected in the combustible gas transport channel. The fire-blocking device 100 has two flow channels, namely, the deflagration-proof channel 101 and the detonation-proof channel 201. Different types of combustion flames flow through different channels, thereby achieving the best fire-blocking effect. The fire-blocking device 100 can block the detonation flame and the deflagration flame at the same time. Secondly, during the normal circulation of the fluid, the fluid passes through the deflagration-proof channel 101. Since the porosity of the first fire-blocking unit in the deflagration-proof channel 101 is greater than the porosity of the second fire-blocking unit in the detonation-proof channel 201, the deflagration-proof channel 101 has a lower pressure loss than the detonation-proof channel 201, which can effectively ensure the fire-blocking and explosion-suppressing performance of the fire-blocking device 100.

[0089] According to the present invention, Figure 2 As shown, the deflagration-proof channel 101 includes a deflagration-proof flame arrester 1, two deflagration-proof flow channel bodies 3 symmetrically arranged at both ends of the deflagration-proof flame arrester 1, and a first flame arresting unit is arranged inside the deflagration-proof flame arrester 1. The deflagration-proof flow channel body 3 is configured to remain open under normal working conditions and when a deflagration flame approaches, and automatically close when a detonation flame approaches. By respectively arranging the deflagration-proof flow channel bodies 3 at both ends of the deflagration-proof flame arrester 1, the deflagration-proof channel 101 can achieve bidirectional flame arresting.

[0090] like Figure 2As shown, the anti-explosion flame retardant flow passage body 3 includes a first shell 31, an anti-explosion flame retardant baffle 7 disposed in the first shell 31, and a first baffle limit frame 33 formed on the inner wall of the first shell 31. The anti-explosion flame retardant baffle 7 is rotatably connected to the inner wall of the first shell 31. Under normal operating conditions and when a deflagration flame approaches, the anti-explosion flame retardant baffle 7 remains lifted to open the anti-explosion flame retardant flow passage body 3. When a detonation flame approaches, the anti-explosion flame retardant baffle 7 rotates to fit with the first baffle limit frame 33 under the action of the detonation impact force to close the anti-explosion flame retardant flow passage body 3.

[0091] Specifically, Figure 3 As shown, under normal working conditions, the combustible gas transport channel normally flows with flammable and explosive fluids, and the anti-explosion baffle 7 ( Figure 3 The force that keeps the lifting can be realized by the locking force of the locking unit 9B, or by the gravity of the counterweight (such as Figure 5 As shown). Since the pressure value of the fluid is small, the pressure of the fluid is not enough to overcome the force to push the anti-explosion retardant baffle 7 to close. At the same time, under the limiting action of the first limiting block 35 (see below), the anti-explosion retardant baffle 7 remains lifted, so that the anti-explosion retardant channel 3 remains open. Under this working condition, the flammable and explosive fluid can only flow and transmit in the anti-explosion retardant channel 3. Since the porosity of the first fire-blocking unit in the anti-explosion retardant flame arrester 1 is larger than that of the second fire-blocking unit in the anti-explosion retardant flame arrester 2, the pressure loss caused by the anti-explosion retardant flame arrester 1 is small, and a lower pressure drop can be generated at this time.

[0092] When the flammable and explosive gas in the combustible gas transport channel encounters the combustible material and deflagrates, due to the small deflagration pressure value, the pressure of the deflagration flame causes the anti-deflagration baffle 7 to rotate from the open state to the closed state, and at the same time, under the limiting action of the first limiting block 35 (see below), the anti-deflagration baffle 7 continues to remain in the raised state, and the anti-deflagration channel 3 continues to remain in the open state. Under this working condition, the deflagration flame can only flow and transmit in the anti-deflagration channel 3, and the first flame arrester unit in the anti-deflagration flame arrester 1 can effectively block the deflagration flame, achieving the effect of efficient deflagration prevention.

[0093] When the flammable and explosive gas in the combustible gas transport channel detonates, the pressure value caused by the precursor impact force of the detonation is extremely large. The precursor impact force of the detonation flame is sufficient to push the anti-deflagration baffle 7 from the open state to the closed state. Under the action of the detonation flame shock wave, the anti-deflagration baffle 7 moves downward ( Figure 3 The first baffle plate is rotated in the counterclockwise direction until it fits with the first baffle plate limit frame 33. Figure 4As shown, at this time, the anti-deflagration baffle 7 is closely attached to the first baffle limit frame 33 and maintained, so that the anti-deflagration channel 3 remains closed. Under this working condition, the detonation flame can only flow and transmit in the anti-deflagration channel 4, and the second flame arrester unit in the anti-deflagration flame arrester 2 can effectively block the detonation flame, achieving an efficient detonation-blocking effect.

[0094] In one embodiment, the first baffle limiting frame 33 is fixed to the inner wall surface of the first shell 31 by welding. Preferably, the angle between the plane where the first baffle limiting frame 33 is located and the cross section of the first shell 31 is not greater than 45°.

[0095] In one embodiment, Figure 2 As shown, the cross section of the first shell 31 is configured to be rectangular. Preferably, the cross-sectional areas of both axial ends of the first shell 31 are configured to decrease from the inside to the outside along the axial direction. Flanges 32 are formed at the axial ends of the first shell 31, respectively, for fixed connection with the flanges 17 at the ends of the combustible gas transport channel and the flame arrester 1. The flanges 32 are preferably arranged at the axial ends of the first shell 31 by welding.

[0096] like Figure 2 As shown, the first baffle limiting frame 33 is provided with a first hinge 34, and the flame retardant baffle 7 is provided with a first rotating shaft 72 (see Fig.15 ), the first rotating shaft 72 is rotatably connected with the first hinge 34, so that the flame retardant baffle 7 is rotatably connected to the first shell 31. The first hinge 34 is preferably fixed to the first baffle limit frame 33 by welding. Figure 4 As shown, a first limit block 35 is provided at the position of the first hinge 34 to limit the lifting angle of the explosion-proof and flame-retardant baffle 7.

[0097] In addition, on one side wall ( Figure 2 An opening is provided on the upper side wall of the first housing 31 for communicating with the detonation-proof passage 201. Preferably, the opening is arranged in a rectangular shape, and the opening is arranged on the side wall of the first housing 31 which forms an acute angle with the first baffle limiting frame 33.

[0098] According to the present invention, Figure 2 As shown, a position indicating unit 9A is provided on the side wall of the first shell 31 for reflecting the rotation position of the flame-retardant and explosion-proof baffle 7 in the first shell 31 .

[0099] like Fig.14As shown, the position indicating unit 9A includes an indicating rod shaft 93 and a position indicating rod 94. The indicating rod shaft 93 penetrates the side wall of the first flow channel housing 31 and is fixedly connected to the first rotating shaft 72 of the flame retardant baffle 7. The position indicating rod 94 is vertically connected to the axial outer end of the indicating rod shaft 93. Preferably, the position indicating rod 94 and the indicating rod shaft 93 are fixedly connected by welding. The position indicating rod 94 and the flame retardant baffle 7 are in the same plane, so that the rotation position of the flame retardant baffle 7 can be displayed by the position indicating rod 94.

[0100] In one embodiment, the position indicating unit 9A further includes an indicating device lower housing 92, a bearing 95, and an indicating device upper housing 96. The bearing 95 is installed in the indicating device lower housing 92, and the indicating rod rotating shaft 93 passes through the bearing 95, so as to be able to rotate. The indicating device lower housing 93 is fixed to the outer wall surface of the side wall 91 of the first housing 31, preferably fixed by welding. The indicating device upper housing 96 is fixedly connected to the indicating device lower housing 92 by studs, so as to limit the bearing 95. Thus, the bearing 95 is fixed between the indicating device upper housing 96 and the indicating device lower housing 92, and the position indicating rod rotating shaft 93 and the wall surface of the first housing 31 are rotated and sealed by a sealing ring. Similarly, the position indicating rod rotating shaft 93 and the indicating device upper housing 93 are rotated and sealed by a sealing ring.

[0101] According to one embodiment of the present invention, the outer wall of the first housing 31 is provided with a locking unit 9B close to the position indicating unit 9A. Fig.14 As shown, the locking unit 9B includes a locking housing 98, a locking rod 97, and an elastic reset member 99. The locking housing 98 is fixedly connected to the outer wall surface of the first housing 31. The locking rod 97 is arranged in the locking housing 98 and can be retracted. The outer end of the locking rod 97 is provided with a matching contact surface for contacting and matching with the position indicating rod 94. Preferably, the matching contact surface is configured as an inclined surface. The elastic reset member 99 is arranged between the inner end of the locking rod 97 and the first housing 31, and the elastic reset member 99 preferably adopts a compression spring. The position indicating rod 94 can be rotated to the position of the locking rod 97, and the locking rod 97 is compressed to rotate the position of the locking rod 97. The locking rod 97 can pop out after the position indicating rod 94 passes to lock the position of the position indicating rod 94. The anti-explosion and ignition baffle 7 can be reset by pressing the locking rod 97 and reversing the position indicating rod 94, thereby, the anti-explosion and ignition channel 3 can be reopened after being closed.

[0102] In one embodiment, the locking unit 9B further includes a locking device lower housing 98 and a locking device upper housing 90. The locking rod 97 can telescopically move in the locking device lower housing 98, and the locking rod 97 has a tendency to move away from the first housing 31, and the movement tendency is provided by the spring compression force of the elastic reset member 99. The two ends of the elastic reset member 99 are respectively connected to the first housing 31 and the locking rod 97, and the connection method is welding. The locking device lower housing 98 is fixed to the first housing 31 by welding. The locking device upper housing 90 is fixed to the locking device lower housing 98 by studs.

[0103] In one embodiment, the locking unit 9B on the outer wall of the first shell 31 includes two locking units, a closed locking unit and an open locking unit. When the position indicating rod 94 is locked with the open locking unit, the explosion-proof and flammable baffle 7 is in an open state; when the position indicating rod 94 is locked with the closed locking unit, the explosion-proof and flammable baffle 7 is in a closed state.

[0104] In the initial state, the position indicating rod 94 is locked with the opening locking unit, and the anti-explosion baffle 7 is in the open state. When the flammable and explosive gas in the combustible gas transport channel encounters the combustible material and deflagrates, due to the small pressure value of the deflagration, the pressure of the deflagration flame is insufficient to overcome the locking force between the position indicating rod 94 and the opening locking unit, the anti-explosion baffle 7 continues to remain in the lifted state, and the anti-explosion channel 3 continues to remain in the open state. Under this working condition, the deflagration flame can only flow and transmit in the anti-explosion channel 3, and the first flame arrester unit in the anti-explosion flame arrester 1 can effectively block the deflagration flame, achieving the effect of efficient deflagration prevention.

[0105] When detonation occurs, due to the extremely high pressure value of detonation, the forerunner impact force of the detonation flame is sufficient to overcome the push of the anti-detonation baffle 7 to separate the position indicator rod 94 from the opening locking unit, and the anti-detonation baffle 7 rotates from the open state to the closed state, and the position indicator rod 94 connects the closing locking unit. The anti-detonation baffle 7 is tightly attached to the first baffle limit frame 33 and maintained, thereby the anti-detonation channel 3 remains in a closed state. Under this working condition, the detonation flame can only flow and transmit in the anti-detonation channel 4, and the second flame arrester unit in the anti-detonation flame arrester 2 can effectively block the detonation flame, achieving the effect of efficient detonation prevention.

[0106] In one embodiment, a counterweight block 94A is provided on the position indicating rod 94, and the gravity of the counterweight block 94A is applied to the position indicating rod 94, thereby driving the anti-explosion and retardant baffle 7 to be lifted and kept in an open state.

[0107] Compared with the previous embodiment, this embodiment does not have an open locking unit, but can have a closed locking unit.

[0108] When the inflammable and explosive gas in the combustible gas transport channel encounters the combustible material and deflagrates, since the deflagration pressure value is relatively small, the pressure of the deflagration flame is insufficient to overcome the gravity of the counterweight block 94A, and the deflagration-proof baffle 7 is in an open state.

[0109] When detonation occurs, the forerunner impact force of the detonation overcomes the gravity of the counterweight 94A, pushing the anti-explosion baffle 7 to rotate from the open state to the closed state, and the position indicating rod (94) is connected to the closing locking unit. The anti-explosion baffle 7 is closely attached to the first baffle limit frame 33 and maintained, thereby the anti-explosion passage 3 remains in the closed state.

[0110] In one embodiment, a first magnetic attraction mechanism 36 is provided on the first baffle limiting frame 33; when the anti-explosion and retardant baffle 7 rotates from an open state to a closed state, the anti-explosion and retardant baffle 7 is connected to the first magnetic attraction mechanism 36 through magnetic attraction, thereby closing the anti-explosion and retardant flow channel body 3. In this embodiment, the first magnetic attraction mechanism replaces the closing locking unit to keep the deflagration baffle 7 in a closed state.

[0111] According to the present invention, the difference between the detonation-proof flame arrester 2 and the deflagration-proof flame arrester 1 is that the porosity of the first flame arrester unit built into the detonation-proof flame arrester 2 is greater than the porosity of the second flame arrester unit built into the deflagration-proof flame arrester 1. The other structures of the detonation-proof flame arrester 2 and the deflagration-proof flame arrester 1 are arranged to be the same.

[0112] The structures of the deflagration-resistant flame arrester 1 and the detonation-resistant flame arrester 2 are described below by taking the deflagration-resistant flame arrester 1 as an example.

[0113] like Figure 6 As shown, the flame arrester 1 comprises a tubular housing 11, a placement cavity 15 formed in the tubular housing 11, and connecting flanges 17 arranged at both axial ends of the tubular housing 11. The placement cavity 15 is used to arrange the first flame arrester unit. The connecting flange 17 is used to be fixedly connected to the flange 38 at the end of the flame arrester flow channel body 3. Preferably, the connecting flange 17 is fixed to the axial ends of the tubular housing 11 by welding.

[0114] In one embodiment, the tubular shell 11 is partially cut along the circumference to form an installation opening for installing the first fire-blocking unit. The circumferential extension length of the installation opening is greater than half of the circumference of the tubular shell 11. A detachable sealing cover plate 12 is provided at the installation opening.

[0115] The circumferential end of the sealing cover plate 12 is provided with a first connection portion 13, and the circumferential end of the mounting opening is provided with a second connection portion 16 that can be adapted to be coupled with the first connection portion 13. Preferably, the first connection portion 13 is fastened to the second connection portion 16 through a fastening assembly, so that the sealing cover plate 12 is tightly connected to the mounting opening of the tubular housing 11.

[0116] The fastening assembly is, for example, a bolt and nut assembly. Corresponding mounting holes are respectively provided on the first connecting portion 13 and the second connecting portion 16 for mounting the bolt and nut assembly. For example, at least two mounting holes are provided. The sealing cover plate 12 is tightly connected to the tubular housing 11 by the pre-tightening force provided by the bolt connection.

[0117] In order to ensure the sealing performance of the connection between the sealing cover plate 12 and the tubular housing 11 , a sealing sheet (not shown) is installed between the sealing cover plate 12 and the tubular housing 11 .

[0118] A limiting portion 14 is provided at the axial end of the installation opening to limit the first flame arrester unit. The limiting portion 14 is preferably arranged to be perpendicular to the axis of the tubular housing 11 and to extend along the circumference of the installation opening. The axial end of the sealing cover plate 12 can form a sealing connection with the limiting portion 14.

[0119] In the actual working process, when it is found that the first fire-blocking unit in the anti-explosion flame arrester 1 needs to be replaced, the fastening assembly is disassembled, the first fire-blocking unit is taken out after opening the sealing cover plate 12, and a new first fire-blocking unit is put in, and then the sealing cover plate 12 is re-sealed and connected with the tubular housing 11 through the fastening assembly. Similarly, when it is found that the second fire-blocking unit in the anti-detonation flame arrester 2 needs to be replaced, the fastening assembly is disassembled, the second fire-blocking unit is taken out after opening the sealing cover plate 12, and a new second fire-blocking unit is put in, and then the sealing cover plate 12 is re-sealed and connected with the tubular housing 11 through the fastening assembly. Thus, when the anti-explosion flame arrester 1 and the anti-detonation flame arrester 2 need to replace the corresponding fire-blocking unit, there is no need to disassemble the pipeline, only the sealing cover plate 12 needs to be opened, the fire-blocking unit is replaced and then the sealing cover plate 12 is re-installed, and the installation is simple and convenient, which greatly improves the efficiency of replacing the fire-blocking unit and reduces the maintenance cost.

[0120] According to the present invention, Figure 1 As shown, the detonation-proof passage 201 includes a detonation-proof flame arrester 2, two detonation-proof flow channel bodies 4 symmetrically arranged at both ends of the detonation-proof flame arrester 2, and a second flame arrester unit is arranged in the detonation-proof flame arrester 2. The detonation-proof flow channel body 4 is configured to remain closed under normal working conditions and when a deflagration flame approaches, and automatically open when a detonation flame approaches. By arranging the detonation-proof flame arresters 2 at both ends of the detonation-proof flame arrester 2, the detonation-proof passage 201 can achieve bidirectional flame arresting.

[0121] like Figure 7 As shown, the detonation-proof flow channel body 4 includes a second shell 41, a detonation-proof baffle 8 disposed in the second shell 41, and a second baffle limiting frame 43 formed on the inner wall of the second shell 41. One end of the second shell 41 ( Figure 7The left end of the first shell 31 is provided with a transfer cavity 411 for communicating with the side of the first shell 31. The detonation-proof baffle 8 is rotatably connected to the inner wall of the second shell 41. Under normal working conditions and when there is a deflagration flame approaching, the detonation-proof baffle 8 remains in contact with the second baffle limit frame 43 to close the detonation-proof flow channel body (4). When there is a detonation flame approaching, the detonation-proof baffle 8 can be lifted up to open the detonation-proof flow channel body 4.

[0122] Specifically, under normal operating conditions, the combustible gas transport channel normally flows with flammable and explosive fluids, and the anti-explosion and ignition channel 3 remains open. Fig.10 As shown, the detonation-proof baffle 8 initially maintains contact with the second baffle limit frame 43 to close the detonation-proof flow channel body 4. Since the pressure value of the fluid is relatively small, the anti-deflagration baffle 7 maintains contact with the second baffle limit frame 43, so that the detonation-proof channel 4 remains closed. Under this working condition, the flammable and explosive fluid can only flow and transmit in the anti-deflagration channel 3. Since the porosity of the first fire-blocking unit in the anti-deflagration flame arrester 1 is larger than that of the second fire-blocking unit in the anti-deflagration flame arrester 2, the pressure loss caused by the anti-deflagration flame arrester 1 is relatively small, and a lower pressure drop can be generated at this time.

[0123] When the flammable and explosive gas in the combustible gas transport channel encounters the combustible material and deflagrates, due to the small deflagration pressure value, the pressure of the deflagration flame pushes the anti-detonation baffle 8 to move, and the anti-detonation baffle 8 continues to maintain the fit state with the second baffle limit frame 43, and the anti-detonation channel 4 continues to remain closed. Under this working condition, the deflagration flame can still only flow and transmit in the anti-deflagration channel 3, and the first flame arrester unit in the anti-deflagration flame arrester 1 can effectively block the deflagration flame, achieving the effect of efficient deflagration prevention.

[0124] When the inflammable and explosive gas in the combustible gas transport channel explodes, due to the extremely high pressure value of the explosion, the pressure of the explosion flame is sufficient to turn the anti-explosion baffle 7 from the open state to the closed state. Under the action of the explosion flame shock wave, the anti-explosion baffle 7 rotates downward to fit with the first baffle limit frame 33. At this time, the anti-explosion baffle 7 is tightly attached to the first baffle limit frame 33 and remains, so that the anti-explosion channel 3 remains in a closed state. At the same time, Fig. 9 As shown, due to the extremely large pressure value of detonation, the pressure of the detonation flame is sufficient to push the detonation-proof baffle 8 to move, so that the detonation-proof baffle 8 rotates to a certain position and stops, so that the detonation-proof channel 4 is in an open state. Under this working condition, the detonation flame can only flow and transmit in the detonation-proof channel 4, and the second flame arrester unit in the detonation-proof flame arrester 2 can effectively block the detonation flame, achieving an efficient detonation-proof effect.

[0125] In one embodiment, Figure 7 As shown, the cross section of the second shell 41 is configured to be rectangular. Figure 7 The left end of the second housing 41 is provided with a transition cavity 411 for communicating with the side of the first housing 31. The transition cavity 411 is formed by cutting along the diagonal of a quadrangular prism, for example. The docking port of the transition cavity 411 is used to communicate with the opening of the side wall of the first housing 31. The other end of the second housing 41 ( Figure 7 The cross-sectional area of ​​the second shell 41 is set to decrease from the middle position to the end, thereby forming a constricted neck. A flange 42 is fixed at the end of the constricted neck for fixed connection with the flange at the end of the detonation arrester 2. The flange 42 is preferably set at the axial end of the second shell 41 by welding.

[0126] In one embodiment, the angle between the plane where the docking port of the adapter cavity 411 is located and the extension axis of the second shell body 41 can be set to 45°. At the same time, the angle between the axial extension direction of the neck portion and the extension axis of the second shell body 41 can be set to 135°. Thus, the detonation-proof channel 201 in the flame arrester 100 is connected to one side of the deflagration-proof channel 101, and the detonation-proof flame arrester 2 and the deflagration-proof flame arrester 1 can be distributed in parallel.

[0127] like Figure 7 As shown, the second baffle limiting frame 43 is provided with a second hinge 44. At the same time, the detonation-proof baffle 8 is provided with a second rotating shaft 82 (see Fig.15 ), the second rotating shaft 82 is rotatably connected with the second hinge 44, so that the explosion-proof baffle 7 is rotatably connected in the second housing 41. The second hinge 44 is preferably fixed to the second baffle limiting frame 43 by welding.

[0128] According to the present invention, the side wall of the second housing 41 is also provided with a position indicating unit 9A for displaying the rotation position of the detonation-arresting baffle 8 .

[0129] Likewise, if Fig.14 As shown, the position indicating unit 9A includes an indicating rod shaft 93 and a position indicating rod 94. The indicating rod shaft 93 passes through the side wall of the second flow channel housing 41 and is fixedly connected to the second shaft 82 of the detonation-proof baffle 8. The position indicating rod 94 is vertically connected to the axial outer end of the indicating rod shaft 93. Preferably, the position indicating rod 94 and the indicating rod shaft 93 are fixedly connected by welding. The position indicating rod 94 and the detonation-proof baffle 8 are in the same plane, so that the rotation position of the detonation-proof baffle 8 can be displayed by the position indicating rod 94.

[0130] In addition, the outer wall of the second housing 41 is also provided with a locking unit 9B close to the position indicating unit 9A. Fig.14As shown, the locking unit 9B includes a locking housing 98, a locking rod 97, and an elastic reset member 99. The locking housing 98 is fixedly connected to the outer wall surface of the second housing 41. The locking rod 97 is arranged in the locking housing 98 and can be retracted. The outer end of the locking rod 97 is provided with a matching contact surface for contacting and matching with the position indicating rod 94. Preferably, the matching contact surface is configured as an inclined surface. The elastic reset member 99 is arranged between the inner end of the locking rod 97 and the second housing 41, and the elastic reset member 99 preferably adopts a compression spring. The position indicating rod 94 can be rotated to the position of the locking rod 97, and the locking rod 97 is compressed to rotate the position of the locking rod 97. The locking rod 97 can pop out after the position indicating rod 94 passes to lock the position of the position indicating rod 94. The anti-explosion baffle 7 can be reset by pressing the locking rod 97 and reversing the position indicating rod 94, thereby, it can be closed again after the anti-detonation channel 4 is opened and anti-detonation is achieved.

[0131] In one embodiment, the locking unit 9B further includes a locking device lower housing 98 and a locking device upper housing 90. The locking rod 97 can telescopically move in the locking device lower housing 98, and the locking rod 97 has a tendency to move away from the first housing 31, and the movement tendency is provided by the spring compression force of the elastic reset member 99. The two ends of the elastic reset member 99 are respectively connected to the second housing 31 and the locking rod 97, and the connection method is welding. The locking device lower housing 98 is fixed to the second housing 31 by welding. The locking device upper housing 90 is fixed to the locking device lower housing 98 by studs.

[0132] It should be noted here that the position indicating unit 9A and the locking unit 9B provided on the second housing 41 have the same structure as the position indicating unit 9A and the locking unit 9B provided on the first housing 31 .

[0133] Fig.15 The structure of the anti-explosion baffle 7 (anti-detonation baffle 8) is schematically shown. Fig.15 As shown, the anti-explosion and retardant baffle 7 includes a panel body 71 configured as a rectangular plate and a first rotating shaft 72 fixedly connected to one end of the panel body 71. The structure of the anti-detonation and retardant baffle 8 is the same as that of the anti-explosion and retardant baffle 7. The anti-detonation and retardant baffle 8 includes a panel body 81 configured as a rectangular plate and a second rotating shaft 82 fixedly connected to one end of the panel body 81.

[0134] In one embodiment, the locking unit 9B includes a first open locking unit and a second open locking unit. When the first open locking unit is locked with the position indicating unit 9A, the detonation-proof baffle 8 is in a first open state; when the second open locking unit is locked with the position indicating unit 9A, the detonation-proof baffle 8 is in a second open state.

[0135] A closing and locking unit is also provided on the outer wall of the second shell 41. Initially, the closing and locking unit and the position indicating unit 9A are in a locked state, and the explosion-proof and flame-retardant baffle 8 is in a closed state.

[0136] During the process of the explosion-retardant baffle 8 rotating from the closed state to the first open state or the second open state, the position indicating rod 94 can rotate therewith until the closed locking unit disengages and moves to the position of the first open locking unit or the second open locking unit, and the first open locking unit or the second open locking unit is locked.

[0137] In another embodiment, a second magnetic attraction mechanism is provided on the second baffle limit frame 43, and the flame retardant and explosion-proof baffle 8 is initially in a closed state and connected to the second magnetic attraction mechanism by magnetic attraction. In this embodiment, the second magnetic attraction mechanism replaces the closing and locking unit in the previous embodiment, and is used to keep the flame retardant and explosion-proof baffle 8 in a closed state.

[0138] In one embodiment, a third magnetic attraction mechanism is disposed on the inner side of the second shell 41 , and the detonation-proof baffle 8 is connected to the third magnetic attraction mechanism when it is lifted, and the detonation-proof baffle 8 is placed in the first open state.

[0139] In this embodiment, the third magnetic attraction mechanism replaces the second opening and locking unit in the above embodiment, and plays a role in keeping the detonation-proof baffle 8 in the second opening state.

[0140] In one embodiment, a counterweight block 94A is provided at the end of the position indicating rod 94 on the position indicating unit 9A on the second shell 41; when the precursor impact force pushes the detonation-proof baffle 8 to move to the second open state, the counterweight block 94A keeps the detonation-proof baffle 8 in the second open state through the action of gravity.

[0141] In this embodiment, the counterweight 94A replaces the third opening and locking unit in the above embodiment, and plays a role in keeping the detonation-proof baffle 8 in the third opening state.

[0142] The entire working process of the fire arresting device 100 according to the present invention is briefly described below.

[0143] In actual application, the flame arrester 100 is connected to the combustible gas transport channel by fastening with the flanges 32 at both ends of the anti-explosion channel 101 to form a communication, thereby connecting the flame arrester 100 to the corresponding position in the combustible gas transport channel.

[0144] Under normal working conditions, the combustible gas transport channel normally circulates flammable and explosive fluids. The anti-explosion baffle 7 in the anti-explosion channel 3 remains lifted to open the anti-explosion flow channel body 3. Since the pressure value of the fluid is small, the pressure of the fluid is not enough to move the anti-explosion baffle 7. At the same time, under the limiting action of the first limit block 35, the anti-explosion baffle 7 remains lifted, so that the anti-explosion channel 3 remains open. At the same time, the anti-explosion baffle 8 in the anti-explosion channel 4 fits with the second baffle limit frame 43 to close the anti-explosion flow channel body 4. Since the pressure value of the fluid is small, the pressure of the fluid is not enough to push the anti-explosion baffle 7 to move. The anti-explosion baffle 7 remains in contact with the second baffle limit frame 43, so that the anti-explosion channel 4 remains closed. Therefore, under this working condition, the anti-deflagration channel 3 remains open and the anti-detonation channel 4 remains closed, and the flammable and explosive fluid can only flow and transmit in the anti-deflagration channel 3. Since the porosity of the first fire-blocking unit in the anti-deflagration flame arrester 1 is larger than the porosity of the second fire-blocking unit in the anti-deflagration flame arrester 2, the pressure loss caused by the anti-deflagration flame arrester 1 is less, and a lower pressure drop can be generated at this time.

[0145] When the flammable and explosive gas in the combustible gas transport channel encounters a combustible material and deflagrates, due to the small pressure value of the deflagration, the pressure of the deflagration flame is not enough to push the anti-deflagration baffle 7 to move, and at the same time, under the limiting action of the first limit block 35, the anti-deflagration baffle 7 continues to remain in a lifted state, and the anti-deflagration channel 3 continues to remain in an open state. At the same time, due to the small pressure value of the deflagration, the pressure of the deflagration flame is not enough to push the anti-deflagration channel 4, and at the same time, under the limiting action of the second limit block 45, the anti-deflagration baffle 8 continues to maintain a fit state with the second baffle limit frame 43, and the anti-deflagration channel 4 continues to remain in a closed state. Therefore, under this working condition, the deflagration flame can only flow and transmit in the anti-deflagration channel 3, and the first fire-blocking unit in the anti-deflagration flame arrester 1 can effectively block the deflagration flame, achieving an efficient anti-deflagration effect.

[0146] Therefore, under normal operating conditions and when a deflagration flame approaches the flame arrester 100, the flame arrester 100 maintains an initial state, that is, the deflagration-proof passage 3 maintains an open state and the detonation-proof passage 4 maintains a closed state.

[0147] When the inflammable and explosive gas in the combustible gas transport channel detonates, due to the extremely large pressure value of the detonation, the pressure of the detonation flame is sufficient to push the anti-explosion baffle 7 to move. Under the action of the shock wave of the detonation flame, the anti-explosion baffle 7 rotates downward to fit with the first baffle limit frame 33. At this time, the anti-explosion baffle 7 is tightly attached to the first baffle limit frame 33 and maintained, thereby the anti-explosion channel 3 remains in a closed state. At the same time, the position indicator rod 94 outside the anti-explosion channel 3 can rotate synchronously with the first rotating shaft 72 of the anti-explosion baffle 7 until the position of the locking rod 97 is located, and after compressing the locking rod 97, it rotates past the position of the locking rod 97, so that the locking rod 97 can pop out after the position indicator rod 94 passes to lock the position of the position indicator rod 94, thereby achieving the state in which the anti-explosion channel 3 remains closed. In addition, the rotation position of the anti-explosion baffle 7 can also be intuitively reflected from the outside in real time through the position indicator rod 94.

[0148] At the same time, due to the extremely large pressure value of detonation, the pressure of the detonation flame is sufficient to push the detonation-proof baffle 8 in the detonation-proof channel 4, so that the detonation-proof baffle 8 stops after rotating to a certain position, so that the detonation-proof channel 4 is in an open state. Under this working condition, the detonation flame can only flow and transmit in the detonation-proof channel 4, and the second fire-blocking unit in the detonation-proof flame arrester 2 can effectively block the detonation flame, thereby achieving the effect of efficient detonation-proofing. Similarly, the position indicator rod 94 outside the detonation-proof channel 4 can rotate synchronously with the second rotating shaft 82 of the detonation-proof baffle 8 until the position of the locking rod 97 is located, and after compressing the locking rod 97, the locking rod 97 is rotated past the position of the locking rod 97, so that the locking rod 97 can pop out after the position indicator rod 94 passes to lock the position of the position indicator rod 94, thereby achieving the state that the detonation-proof channel 4 remains open. In addition, the rotation position of the anti-detonation baffle 7 can also be intuitively reflected from the outside in real time through the position indicator rod 94.

[0149] After the fire arrester 100 realizes a detonation flame through the detonation-proof channel 4, the detonation-proof baffle 7 can be reset by pressing the corresponding locking rod 97 outside the detonation-proof channel 3 and rotating the position indicating rod 94 in the opposite direction, so that the detonation-proof channel 3 can be reset and reopened. Similarly, the detonation-proof baffle 8 can be reset by pressing the corresponding locking rod 97 outside the detonation-proof channel 4 and rotating the position indicating rod 94 in the opposite direction, so that the detonation-proof channel 4 can be reset and closed again. In this way, the fire arrester 100 is reset, so that normal operation can be continued.

[0150] The fire arrester 100 according to the present invention can block both detonation flames and deflagration flames. By providing two flow channels, the deflagration-proof channel 101 and the detonation-proof channel 201, the fire arrester 100 can allow the fluid to flow through the deflagration-proof channel 101 under normal operating conditions. When a deflagration flame approaches, the deflagration-proof channel 101 is kept open and the detonation-proof channel 201 is kept closed, thereby preventing the deflagration flame through the deflagration-proof channel 101. When a detonation flame approaches, the deflagration-proof channel 101 can be automatically closed and the detonation-proof channel 201 can be opened, thereby preventing the detonation flame through the detonation-proof channel 201, thereby allowing different types of combustion flames to flow through different channels, thereby achieving the best fire arrester effect. Secondly, during the normal circulation of the fluid, the fluid passes through the anti-explosion channel 101. Since the porosity of the first fire-blocking unit in the anti-explosion channel 101 is greater than the porosity of the second fire-blocking unit in the anti-detonation channel 201, the anti-explosion channel 101 has a lower pressure loss than the anti-detonation channel 201, which can effectively ensure the fire-blocking and explosion-suppressing performance of the fire-blocking device 100. In addition, when the anti-explosion flame arrester 1 and the anti-detonation flame arrester 2 need to replace the corresponding fire-blocking unit, there is no need to disassemble the pipeline. It is only necessary to open the sealing cover plate 12, replace the fire-blocking unit and then reinstall the sealing cover plate 12. The installation is simple and convenient, which greatly improves the efficiency of replacing the fire-blocking unit and reduces the maintenance cost. In addition, the channel fire-blocking device 100 can also achieve two-way fire blocking.

[0151] The following describes the invention in conjunction with specific embodiments.

[0152] Example 1

[0153] This embodiment provides a fire-blocking device, including a deflagration-blocking flow channel body 3 .

[0154] In this embodiment, if Figure 3 As shown, the explosion-retardant flow channel body 3 includes a first shell 31; an explosion-retardant baffle 7 arranged in the first shell 31, and the explosion-retardant baffle 7 is rotatably connected to the inner wall of the first shell 31; and a first baffle limit frame 33 formed on the inner wall of the first shell 31.

[0155] The locking unit 9B on the outer wall of the first shell 31 includes a closing locking unit. When the position indicating rod 94 is locked with the closing locking unit, the flame retardant baffle 7 is in a closed state. The locking unit 9B on the outer wall of the first shell 31 also includes an opening locking unit. The position indicating rod 94 is initially locked with the opening locking unit, and the flame retardant baffle 7 is in an open state; during the process of the flame retardant baffle 7 rotating from the open state to the closed state, the position indicating rod 94 can rotate to disengage from the opening locking unit, and move to the position of the closing locking unit and lock with the closing locking unit.

[0156] Example 2

[0157] This embodiment provides a fire-blocking device, including a deflagration-blocking flow channel body 3 .

[0158] In this embodiment, the explosion-retardant flow channel body 3 includes a first shell 31; an explosion-retardant baffle 7 arranged in the first shell 31, and the explosion-retardant baffle 7 is rotatably connected to the inner wall of the first shell 31; and a first baffle limit frame 33 formed on the inner wall of the first shell 31.

[0159] like Figure 4 As shown, a first magnetic attraction mechanism 36 is provided on the first baffle limiting frame 33; when the anti-explosion retardant baffle 7 rotates from an open state to a closed state, the anti-explosion retardant baffle 7 is connected to the first magnetic attraction mechanism 36 through magnetic attraction, thereby closing the anti-explosion retardant flow channel body 3.

[0160] like Figure 5 As shown, a counterweight block 94A is provided on the position indicating rod 94, and the gravity of the counterweight block 94A is applied to the position indicating rod 94, thereby driving the anti-explosion and retardant baffle 7 to be lifted and kept in an open state.

[0161] Example 3

[0162] This embodiment provides a fire-blocking device, including a deflagration-blocking flow channel body 3 .

[0163] In this embodiment, if Figure 3 As shown, the explosion-retardant flow channel body 3 includes a first shell 31; an explosion-retardant baffle 7 arranged in the first shell 31, and the explosion-retardant baffle 7 is rotatably connected to the inner wall of the first shell 31; and a first baffle limit frame 33 formed on the inner wall of the first shell 31.

[0164] like Figure 5 As shown, the locking unit 9B on the outer wall of the first shell 31 includes a closing locking unit, and when the position indicating rod 94 is locked with the closing locking unit, the anti-explosion and retardant baffle 7 is in a closed state. A counterweight block 94A is provided on the position indicating rod 94, and the gravity of the counterweight block 94A is applied to the position indicating rod 94, thereby driving the anti-explosion and retardant baffle 7 to be lifted and kept in an open state.

[0165] Example 4

[0166] This embodiment provides a fire-blocking device, including a deflagration-blocking flow channel body 3 .

[0167] The detonation-proof flow channel body 4 includes: a second shell 41, one end of which is provided with a transfer cavity 411 for forming communication with the side of the second shell 41; a detonation-proof baffle 8 arranged in the second shell 41, and the detonation-proof baffle 8 is rotatably connected to the inner wall of the second shell 41; and a second baffle limiting frame 43 formed on the inner wall of the second shell 41.

[0168] like Fig. 9 and Fig.10 As shown, a locking unit 9B close to the position indicating unit 9A is also provided on the outer wall of the second shell 41, and the locking unit 9B can be used to lock and reset the anti-detonation baffle 8; the locking unit 9B includes a first open locking unit and a second open locking unit, and when the first open locking unit is locked with the position indicating unit 9A, the anti-detonation baffle 8 is in a first open state; when the second open locking unit is locked with the position indicating unit 9A, the anti-detonation baffle 8 is in a second open state.

[0169] A closing locking unit (such as Fig.11 As shown), initially, the position indicating unit 9A of the closing and locking unit is in a locked state, and the explosion-proof and extinguishing baffle 8 is in a closed state; during the process of the explosion-proof and extinguishing baffle 8 rotating from the closed state to the first open state or the second open state, the position indicating rod 94 can rotate therewith until the closing and locking unit disengages, and moves to the position of the first open locking unit or the second open locking unit, and the first open locking unit or the second open locking unit is locked.

[0170] Example 5

[0171] This embodiment provides a fire-blocking device, including a deflagration-blocking flow channel body 3 .

[0172] The detonation-proof flow channel body 4 includes: a second shell 41, one end of which is provided with a transfer cavity 411 for forming communication with the side of the second shell 41; a detonation-proof baffle 8 arranged in the second shell 41, and the detonation-proof baffle 8 is rotatably connected to the inner wall of the second shell 41; and a second baffle limiting frame 43 formed on the inner wall of the second shell 41.

[0173] like Fig.12 As shown, a second magnetic attraction mechanism 46 is provided on the second baffle limiting frame 43. Initially, the anti-explosion and ignition baffle 8 is in a closed state and is connected to the second magnetic attraction mechanism 46 by magnetic attraction. A first opening and locking unit and a second opening and locking unit are provided on the second housing. When the first opening and locking unit is locked with the position indicating unit 9A, the anti-explosion and ignition baffle 8 is in a first opening state; when the second opening and locking unit is locked with the position indicating unit 9A, the anti-explosion and ignition baffle 8 is in a second opening state.

[0174] Example 6

[0175] This embodiment provides a fire-blocking device, including a deflagration-blocking flow channel body 3 .

[0176] The detonation-proof flow channel body 4 includes: a second shell 41, one end of which is provided with a transfer cavity 411 for forming communication with the side of the second shell 41; a detonation-proof baffle 8 arranged in the second shell 41, and the detonation-proof baffle 8 is rotatably connected to the inner wall of the second shell 41; and a second baffle limiting frame 43 formed on the inner wall of the second shell 41.

[0177] like Fig.13 As shown, a second magnetic attraction mechanism 46 is provided on the second baffle limiting frame 43 , and initially the explosion-proof and flame-retardant baffle 8 is in a closed state and is connected to the second magnetic attraction mechanism 46 through magnetic attraction.

[0178] A third magnetic attraction mechanism 47 is disposed on the inner side of the second shell 41 . When the detonation-proof baffle 8 is lifted, it is connected to the third magnetic attraction mechanism 47 , and the detonation-proof baffle 8 is placed in the first open state.

[0179] A counterweight 94A is provided at the end of the position indicating rod 94 on the position indicating unit 9A on the second shell 41; when the precursor impact force pushes the detonation-proof baffle 8 to move to the second open state, the counterweight 94A keeps the detonation-proof baffle 8 in the second open state through the action of gravity.

[0180] Example 7

[0181] A fire-blocking device comprises a deflagration-blocking channel 101, in which a first fire-blocking unit is arranged; and a detonation-blocking channel 201 connected in parallel to one side of the deflagration-blocking channel 101, in which a second fire-blocking unit is arranged.

[0182] The porosity of the first fire-blocking unit is greater than the porosity of the second fire-blocking unit, and the fire-blocking device is configured to allow fluid to flow through the deflagration-proof channel 101 under normal operating conditions, and to keep the deflagration-proof channel 101 open and the detonation-proof channel 201 closed when a deflagration flame approaches, thereby preventing the deflagration flame through the first fire-blocking unit, and to automatically close the deflagration-proof channel 101 and open the detonation-proof channel 201 when a detonation flame approaches, thereby preventing the detonation flame through the second fire-blocking unit.

[0183] The deflagration-proof channel 101 includes a deflagration-proof flame arrester 1 and two deflagration-proof flow channel bodies 3 symmetrically arranged at both ends of the deflagration-proof flame arrester 1. The detonation-proof channel 201 includes a detonation-proof flame arrester 2 and two detonation-proof flow channel bodies 4 symmetrically arranged at both ends of the detonation-proof flame arrester 2, and the second flame arrester unit is arranged in the detonation-proof flame arrester 2.

[0184] The two deflagration-resistant flow channel bodies 3 can be selected from any one of the embodiments 1 to 3, that is, the deflagration-resistant fluid 3 on the left can be selected from one of the embodiments 1, 2 or 3, and the deflagration-resistant fluid 3 on the right can also be selected from one of the embodiments 1, 2 or 3. Therefore, there are 9 implementations of the deflagration-resistant channel 101.

[0185] Example 8

[0186] A fire-blocking device comprises a deflagration-blocking channel 101, in which a first fire-blocking unit is arranged; and a detonation-blocking channel 201 connected in parallel to one side of the deflagration-blocking channel 101, in which a second fire-blocking unit is arranged.

[0187] The porosity of the first fire-blocking unit is greater than the porosity of the second fire-blocking unit, and the fire-blocking device is configured to allow fluid to flow through the deflagration-proof channel 101 under normal operating conditions, and to keep the deflagration-proof channel 101 open and the detonation-proof channel 201 closed when a deflagration flame approaches, thereby preventing the deflagration flame through the first fire-blocking unit, and to automatically close the deflagration-proof channel 101 and open the detonation-proof channel 201 when a detonation flame approaches, thereby preventing the detonation flame through the second fire-blocking unit.

[0188] The detonation-arrestor channel 201 comprises a detonation-arrestor flame arrester 2 , and two detonation-arrestor flow channel bodies 4 symmetrically arranged at two ends of the detonation-arrestor flame arrester 2 , and the second flame arrester unit is arranged in the detonation-arrestor flame arrester 2 .

[0189] The two detonation-proof flow channel bodies 4 can each be selected from any one of the embodiments 4 to 6, that is, the detonation-proof flow channel body 4 on the left can be selected from one of the embodiments 4, 5 or 6, and the detonation-proof flow channel body 4 on the right can also be selected from one of the embodiments 4, 5 or 6. Therefore, there are 9 implementations of the detonation-proof channel 201.

[0190] On the whole, the fire-blocking device of the present invention can be a combination of Example 7 and Example 8, wherein Example 7 has 9 implementations, Example 8 has 9 implementations, and the overall fire-blocking device can have 81 implementations, which are not listed one by one here.

[0191] In the description of the present invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0192] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0193] In addition, in the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0194] Finally, it should be noted that the above is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fire arresting device, comprising: An anti-explosion and anti-fire channel (101), wherein a first fire-blocking unit is provided inside the channel; A detonation-proof channel (201) connected in parallel to one side of the deflagration-proof channel (101), wherein a second flame-proof unit is arranged inside the detonation-proof channel; The porosity of the first fire-blocking unit is greater than the porosity of the second fire-blocking unit. The flame arresting device is configured to allow fluid to flow through the deflagration-resistant passage (101) under normal operating conditions. When a deflagration flame approaches, the deflagration prevention passage (101) is kept open and the detonation prevention passage (201) is kept closed, thereby preventing the deflagration flame through the first flame arresting unit. When a detonation flame approaches, the deflagration-blocking passage (101) is automatically closed and the detonation-blocking passage (201) is opened, thereby preventing the detonation flame through the second flame-blocking unit.

2. The fire arrester according to claim 1, characterized in that: The deflagration-resistant passage (101) comprises a deflagration-resistant flame arrester (1), and two deflagration-resistant flow channel bodies (3) symmetrically arranged at two ends of the deflagration-resistant flame arrester (1), wherein the first flame arrester unit is arranged in the deflagration-resistant flame arrester (1); The anti-deflagration flow channel body (3) is constructed so as to remain open in normal working conditions and when a deflagration flame approaches, and to automatically close when a detonation flame approaches.

3. The fire arresting device according to claim 2, characterized in that: The anti-explosion and retardant flow channel body (3) comprises: A first housing (31); An anti-explosion retardant baffle (7) disposed in the first shell (31), the anti-explosion retardant baffle (7) being rotatably connected to the inner wall of the first shell (31); a first baffle limiting frame (33) formed on the inner wall of the first shell (31); and The anti-explosion and retardant baffle (7) is in an open state in a normal working condition and when a deflagration flame approaches, and in the open state, the anti-explosion and retardant baffle (7) remains lifted to open the anti-explosion and retardant flow channel body (3); When a detonation flame approaches, a forerunner impact force will arrive before the detonation flame, and the forerunner impact force pushes the anti-explosion and flame-retardant baffle plate (7) to rotate from an open state to a closed state. In the closed state, the anti-explosion and flame-retardant baffle plate (7) fits with the first baffle limit frame (33) to close the anti-explosion and flame-retardant flow channel body (3).

4. The fire arresting device according to claim 3, characterized in that: The angle between the plane where the first baffle limiting frame (33) is located and the cross section of the first shell (31) is no greater than 45°.

5. The fire arresting device according to claim 4, characterized in that: The first baffle limiting frame (33) is provided with a first hinge (34), the explosion-proof and retardant baffle (7) is provided with a first rotating shaft (72), the first rotating shaft (72) is rotatably connected with the first hinge (34), and a first limiting block (35) for limiting the lifting angle of the explosion-proof and retardant baffle (7) is provided at the position of the first hinge (34).

6. The fire arresting device according to claim 4, characterized in that: The side wall of the first housing (31) is provided with a position indicating unit (9A), which comprises: an indicating rod rotating shaft (93) penetrating through the side wall of the first flow channel housing (31) and fixedly connected to the first rotating shaft (72); A position indicating rod (94) vertically connected to the axial outer end of the indicating rod rotating shaft (93); The position indicating rod (94) and the anti-explosion and retardant baffle (7) are located in the same plane, and the rotational position of the anti-explosion and retardant baffle (7) can be displayed by the position indicating rod (94).

7. The fire arresting device according to claim 6, characterized in that: The outer wall of the first housing (31) is provided with a locking unit (9B) close to the position indicating unit (9A). The locking unit (9B) is configured to be able to be locked and unlocked with the position indicating rod (94); when the locking unit (9B) is locked with the position indicating rod (94), the position of the explosion-proof and flame-retardant baffle (7) is fixed.

8. The fire arresting device according to claim 7, characterized in that: The locking unit (9B) on the outer wall of the first shell (31) comprises a closing locking unit, and when the position indicating rod (94) is locked with the closing locking unit, the explosion-proof and flame-retardant baffle (7) is in a closed state.

9. The fire arresting device according to claim 8, characterized in that: The locking unit (9B) on the outer wall of the first shell (31) further comprises an opening locking unit, the position indicating rod (94) is initially in a locked state with the opening locking unit, and the explosion-proof and flame-retardant baffle (7) is in an open state; During the process of the explosion-proof baffle (7) rotating from an open state to a closed state, the position indicating rod (94) can rotate accordingly until the opening locking unit is disengaged, and move to the position of the closing locking unit and lock with the closing locking unit.

10. The fire arresting device according to claim 6 or 7, characterized in that: A first magnetic attraction mechanism (36) is provided on the first baffle limiting frame (33); when the anti-explosion and retardant baffle (7) rotates from an open state to a closed state, the anti-explosion and retardant baffle (7) is connected to the first magnetic attraction mechanism (36) through magnetic attraction, thereby closing the anti-explosion and retardant flow channel body (3).

11. The fire arresting device according to any one of claims 8 to 10, characterized in that: A counterweight (94A) is provided on the position indicating rod (94), and the gravity of the counterweight (94A) is applied to the position indicating rod (94), thereby driving the anti-explosion retardant baffle (7) to be lifted and kept in an open state.

12. The fire arresting device according to any one of claims 7 to 11, characterized in that: The detonation-proof channel (201) comprises a detonation-proof flame arrester (2), two detonation-proof flow channel bodies (4) symmetrically arranged at two ends of the detonation-proof flame arrester (2), and the second flame arrester unit is arranged in the detonation-proof flame arrester (2); The detonation-proof flow channel body (4) is constructed so as to remain closed in normal working conditions and when a deflagration flame approaches, and to automatically open when a detonation flame approaches.

13. The fire arresting device according to claim 12, characterized in that: The detonation-proof flow channel body (4) comprises: A second shell (41), one end of which is provided with a transition cavity (411) for communicating with a side portion of the second shell (41); a detonation-proof baffle (8) disposed in the second shell (41), the detonation-proof baffle (8) being rotatably connected to the inner wall of the second shell (41); a second baffle limiting frame (43) formed on the inner wall of the second shell (41); The detonation-proof baffle (8) is fitted with the second baffle limit frame (43) in normal working conditions and when a deflagration flame approaches, and is in a closed state to close the detonation-proof flow channel body (4). When a detonation flame approaches, the detonation-proof baffle (8) is lifted or lowered under the action of a precursor impact force to open the detonation-proof flow channel body (4). The detonation-proof baffle (8) is lifted to be in a first open state, and is lowered to be in a second open state.

14. The fire arresting device according to claim 13, characterized in that: The second baffle limiting frame (43) is provided with a second hinge (44), the detonation-proof baffle (8) is provided with a second rotating shaft (82), and the second rotating shaft (82) is rotatably connected to the second hinge (44).

15. The fire arresting device according to claim 14, characterized in that: The position indicating unit (9A) is provided on the side wall of the second shell (41) for displaying the rotational position of the detonation-proof baffle (8).

16. The fire arresting device according to claim 15, characterized in that: The locking unit (9B) close to the position indicating unit (9A) is also provided on the outer wall of the second shell (41), and the detonation-proof baffle (8) can be locked and reset by means of the locking unit (9B); The locking unit (9B) comprises a first opening locking unit and a second opening locking unit; when the first opening locking unit is locked with the position indicating unit (9A), the detonation-proof baffle (8) is in a first opening state; when the second opening locking unit is locked with the position indicating unit (9A), the detonation-proof baffle (8) is in a second opening state.

17. The fire arresting device according to claim 16, characterized in that: A closing and locking unit is also provided on the outer wall of the second shell (41); initially, the closing and locking unit and the position indicating unit (9A) are in a locked state, and the explosion-proof and flame-retardant baffle (8) is in a closed state; During the process of the explosion-proof baffle (8) rotating from the closed state to the first open state or the second open state, the position indicating rod (94) can rotate accordingly until the closed locking unit is disengaged, and move to the position of the first open locking unit or the second open locking unit, and the first open locking unit or the second open locking unit is locked.

18. The fire arresting device according to claim 15, characterized in that: A second magnetic attraction mechanism (46) is provided on the second baffle limiting frame (43); initially, the explosion-proof and flame-retardant baffle (8) is in a closed state and is connected to the second magnetic attraction mechanism (46) through magnetic attraction.

19. The fire arresting device according to claim 18, characterized in that: A third magnetic attraction mechanism (47) is provided on the inner side of the second shell (41); when the detonation-proof baffle (8) is lifted, it is connected to the third magnetic attraction mechanism (47), and the detonation-proof baffle (8) is placed in a first open state.

20. The fire arresting device according to claim 19, characterized in that: A counterweight (94A) is provided at the end of the position indicating rod (94) on the position indicating unit (9A) on the second shell (41); when the precursor impact force pushes the detonation-proof baffle (8) to move to the second open state, the counterweight (94A) maintains the detonation-proof baffle (8) in the second open state through the action of gravity.

21. The fire arresting device according to any one of claims 7 to 20, characterized in that: The locking unit (9B) comprises: A locking shell (98) fixedly connected to the outer wall surface of the first shell (31); a locking rod (97) disposed in the locking housing (98) and capable of extension and contraction, wherein the outer end of the locking rod is provided with a mating contact surface; and an elastic return member (99) disposed between the inner end of the locking rod (97) and the first housing (31); The position indicating rod (94) moves to the position where the locking rod (97) is located, compressing the locking rod (97) and rotating past the position of the locking rod (97). The locking rod (97) can pop out after the position indicating rod (94) passes through to lock the position indicating rod (94). The anti-explosion and flame-retardant baffle (7) can be reset by pressing the locking rod (97) and reversing the position indicating rod (94).

22. The fire arresting device according to claim 21, characterized in that: The anti-explosion and anti-flame arrester (1) comprises: A tubular housing (11); A placement cavity (15) formed in the tubular housing (11) for arranging the first fire-blocking unit; The connecting flanges (17) are arranged at the two axial ends of the tubular shell (11) and are used to connect the explosion-proof and flame-retardant flow channel body (3).

23. The fire arresting device according to claim 22, characterized in that: The tubular shell (11) is partially cut along the circumference to form an installation opening for installing the first fire-blocking unit, the circumferential extension length of the installation opening is greater than half the circumference of the tubular shell (11), and a detachable sealing cover plate (12) is provided at the installation opening.

24. The fire arresting device according to claim 23, characterized in that: A first connection portion (13) is provided at a circumferential end of the sealing cover plate (12), and a second connection portion (16) capable of being adapted to be connected to the first connection portion (13) is provided at a circumferential end of the mounting opening. The first connection portion (13) is fastened to the second connection portion (16) via a fastening assembly, so that the sealing cover plate (12) and the tubular housing (11) are tightly connected.

25. The fire arresting device according to claim 23 or 24, characterized in that: A limiting portion (14) is provided at the axial end of the installation opening for limiting the first fire-blocking unit, and the axial end of the sealing cover plate (12) can form a sealing connection with the limiting portion (14).

26. The fire arresting device according to claim 25, characterized in that: The detonation-proof flame arrester (2) is constructed in the same structure as the deflagration-proof flame arrester (1).

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