CN116999738A - Flame arrester for petrochemical engineering safety production - Google Patents

Abstract

The application discloses a flame arrester for petrochemical safety production, wherein a movable flame arrester core structure is arranged in a shell, a rotary drum type structure is formed by a rotary ring, a flame arrester ring layer and a rotary head, flames can strike a guide ball and can be uniformly dispersed and pass through the flame arrester ring layer, the integral flame arrester core structure can also be buffered by matching a first spring with the rotary ring, a spiral blade can be driven to rotate by the backward circulation of air flow of the flame arrester ring layer, the integral flame arrester core structure is driven to rotate, the flame arrester ring layer can be ensured to uniformly play a flame arrester role, the situation of large local deformation quantity is avoided, a centrifugal sliding block is sleeved in a centrifugal hole in a sliding manner and is provided with a third spring for pulling, then the flame arrester core structure is communicated with a second air cavity through a first air cavity, and when the inside of the flame arrester ring layer is seriously blocked, a first sliding contact with the first conductive ring and the second conductive ring contact with a connection circuit, so that an alarm is given out, and a worker is timely reminded of overhauling a pipe valve to improve safety.

Description

Flame arrester for petrochemical engineering safety production

Technical Field

The application relates to the technical field of flame arresters, in particular to a flame arrestor for petrochemical engineering safety production.

Background

In petrochemical industry, in order to play a safety role, a flame arrester is generally needed, and the flame arrester is a safety device for preventing flames of flammable gas and flammable liquid steam from spreading, and mainly comprises a flame arrester core, a flame arrester shell and accessories, and the working principle is as follows: one of the requirements for combustion is to reach a certain temperature, namely ignition point, lower than ignition point, combustion will stop, according to this principle, flame spread can be prevented as long as the temperature of combustion substances is reduced below the ignition point, when flame will become a plurality of fine flames after passing through many fine channels of the fire retarding element, when designing the fire retarding core inside the flame retarder, the contact area of the fine flames and the channel wall is expanded as much as possible, heat transfer is enhanced, flame temperature is reduced below the ignition point, thus flame spread is prevented, but conventional flame retarders have certain disadvantages:

firstly, when the flame arrester is used for carrying out fire-retarding, flames are directly impacted, and along with the increase of the propagation distance, the pressure and the speed of a flame front in a closed space can be rapidly increased, so that the impact force of the flames impacting on a fire-retarding core is overlarge to form detonation, on one hand, potential safety hazards are caused, and on the other hand, the fire-retarding core bears larger stress deformation quantity, so that the service life of the fire-retarding core is shortened; secondly, when the flame is blocked by using the flame-retardant core, the flame generally impacts the flame-retardant core in the middle part or approaches to the top part, so that the local deformation of the flame retardant is larger, and the service life of the flame retardant is further influenced;

meanwhile, the fire arrestor is installed on a conveying pipeline and is formed by sealing high-strength materials, so that a worker cannot observe the use condition of an internal fire-retarding core, and the fire-retarding core can burn to generate particles when in use, so that the inside of the fire-retarding core is blocked, and when the fire-retarding core is blocked to a certain extent, or the fire-retarding performance of the fire-retarding core is reduced but can not be timely known after a certain deformation amount occurs, the pressure on one side of the fire-retarding core is increased, and potential safety hazards exist.

Disclosure of Invention

The application provides a flame arrester for petrochemical engineering safety production, which has the advantages of high safety and long service life and is used for solving the problems of the background technology.

In order to achieve the above purpose, the application adopts the following technical scheme: the utility model provides a petrochemical safety in production is with flame arrester, includes the shell, the both ends fixed mounting of shell has the end shell, the water conservancy diversion chamber has been seted up to the inside of shell, the conical groove with water conservancy diversion chamber intercommunication has been seted up to the shell front end, the water conservancy diversion mouth has been seted up at the middle part of end shell, water conservancy diversion mouth and conical groove intercommunication, the water conservancy diversion chamber lateral wall is located conical groove outer lane department and has been seted up the shrink groove, shrink inslot portion has rotated the ring that has cup jointed, the outer terminal surface fixed mounting of ring has the fire-retardant ring layer, the other end fixedly connected with of fire-retardant ring layer turns round, the water conservancy diversion intracavity wall is located the even fixed mounting of turning round side position department and has the connecting rod, fixed mounting has the lantern ring between the tip of connecting rod, and the lantern ring is coaxial with the water conservancy diversion chamber, the middle part fixedly connected with pivot that the turning round is close to lantern ring one side, and pivot outer lane activity cup joint in the lantern ring, shrink inslot activity cup joints first spring, and the both ends of first spring respectively with shrink bottom surface fixed connection of ring.

Further, the slide hole has been seted up to the middle part that the rotor is close to fire-retardant ring layer one side, the inside sliding sleeve of slide hole has cup jointed the slide bar, the outer tip fixed mounting of slide bar has the water conservancy diversion ball, fixedly connected with second spring between the interior terminal surface of slide bar and the slide hole bottom wall, the tip fixed mounting of pivot has the spiral leaf.

Further, the water conservancy diversion ball is located conical tank one side middle part position department, the fire-retardant ring layer is round platform form, the great one end of fire-retardant ring layer diameter and swivel fixed connection, and the great one end of diameter and swivel fixed connection.

Further, the shell outer lane is located the mounting plane of connecting rod and fixedly mounted has the alarm, the one end and the water conservancy diversion chamber intercommunication centrifugal hole have been seted up to the top and the bottom symmetry that the turning round is close to connecting rod one side, the first gas chamber has been seted up to the position that the turning round is located two centrifugal holes centre, and first gas chamber both ends communicate with two centrifugal holes respectively, the inside slip of slide hole has cup jointed centrifugal slider, fixedly connected with bellows and third spring between centrifugal slider bottom surface and the centrifugal hole diapire, and the third spring is located the outer lane position of bellows.

Further, the second air cavity is arranged in the middle of the rotating shaft and is communicated with the first air cavity, the annular groove is arranged in the middle of the inner ring of the lantern ring, the first conductive ring and the second conductive ring are symmetrically and fixedly arranged at two side walls of the annular groove respectively, the first sliding groove is arranged at the top of the second air cavity, the second sliding groove is arranged at the bottom of the second air cavity, the first sliding contact is sleeved in the first sliding groove in a sliding mode, and the second sliding contact is sleeved in the second sliding groove in a sliding mode.

Further, a wire is fixedly connected between the first sliding contact and the second sliding contact, the horizontal interval distance between the first sliding groove and the second air cavity is equal to the horizontal interval distance between the first conductive ring and the second conductive ring in the annular groove, the first conductive ring is connected to the alarm through a connecting rod at the top, and the second conductive ring is connected to the alarm through a connecting rod at the bottom.

Further, when the end face of the rotating head is attached to the side face of the lantern ring, the first sliding contact and the second sliding contact are located in the annular groove inner ring, when the rotating speed of the rotating head is lower than v, the third spring pulls the centrifugal sliding block to slide towards the inside of the centrifugal hole to compress the air pressure in the first air cavity, and the air pressure is transmitted to the second air cavity to eject the first sliding contact and the second sliding contact to be in contact with the first conducting ring and the second conducting ring respectively.

Compared with the prior art, the flame arrester for petrochemical safety production provided by the application has the advantages that the movable flame arrester core structure is arranged in the shell, compared with the prior art, the rotary ring, the flame arrester ring layer and the rotary head are utilized to form the rotary cylinder structure, the gas or flame is passed through the rotary ring structure, the flame can strike the guide ball to be uniformly dispersed and pass through the flame arrester ring layer, the integral flame arrester core structure can also be matched with the rotary ring to perform the buffer effect through the first spring, the spiral blade can be driven to rotate through the backward circulation of the air flow of the flame arrester ring layer, and the integral flame arrester core structure is driven by the rotary shaft to realize the rotation effect, so that the flame arrester effect can be uniformly realized in one circle when the flame arrester ring layer is used for arresting the flame, the situation of large local deformation quantity is avoided, and the dispersion effect of the guide ball and the flame arrester direction effect of the flame arrester ring layer can also be improved;

through sliding at the inside centrifugal slider that cup joints of centrifugal hole and be furnished with the third spring pulling, then communicate through first air cavity and second air cavity, compared with prior art, when the inside serious circumstances of jam appears in the ring in the back-fire relief, the inside atmospheric pressure of back-fire relief core structure is whole increases and drive the laminating of turning end face and lantern ring side, make first spout and second spout correspond to the annular this moment, because the air current that the jam leads to reduces and leads to the shrink of centrifugal slider to the centrifugal hole inside, drive the atmospheric pressure and make first sliding contact and second sliding contact stretch out, and contact the switching-on circuit with first conducting ring and second conducting ring, make the alarm report to the police, timely warning staff pipe valve overhauls, improve the security.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description, serve to explain the principles of the application.

The disclosure may be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of the overall structure of the present application;

FIG. 2 is a top plan view of the overall structure of the present application;

FIG. 3 is a partial cross-sectional view of the entire structure of the present application;

FIG. 4 is a cross-sectional view taken along line A-A of FIG. 2;

FIG. 5 is a cross-sectional view B-B of FIG. 3;

FIG. 6 is a cross-sectional view taken along line C-C of FIG. 4;

fig. 7 is an enlarged view of fig. 3 at D.

Wherein: 1. a housing; 101. a diversion cavity; 102. a conical groove; 103. a shrink tank; 2. an end shell; 201. a diversion port; 3. a swivel; 4. a firestop ring layer; 5. turning the head; 501. a slide hole; 502. centrifuging the hole; 503. a first air chamber; 6. a connecting rod; 7. a collar; 701. a ring groove; 8. a rotating shaft; 801. a second air chamber; 802. a first chute; 803. a second chute; 9. a first spring; 10. a slide bar; 11. a diversion ball; 12. a second spring; 13. spiral leaves; 14. an alarm; 15. centrifuging the sliding block; 16. a bellows; 17. a third spring; 18. a first slider; 19. a second slider; 20. a first conductive ring; 21. and a second conductive ring.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Referring to fig. 1-6, a flame arrester for petrochemical safety production comprises a housing 1, an end shell 2 is fixedly arranged at two ends of the housing 1, a diversion cavity 101 is formed in the housing 1, a conical groove 102 communicated with the diversion cavity 101 is formed in the front end of the housing 1, a diversion port 201 is formed in the middle of the end shell 2, the diversion port 201 is communicated with the conical groove 102, a shrinkage groove 103 is formed in the outer ring of the conical groove 102 on the side wall of the diversion cavity 101, a swivel 3 is rotatably sleeved in the shrinkage groove 103, a flame arrester ring layer 4 is fixedly arranged on the outer end face of the swivel 3, a swivel 5 is fixedly connected to the other end of the flame arrester ring layer 4, a connecting rod 6 is uniformly and fixedly arranged at the side face of the swivel 5 through the swivel 3, the inner wall of the diversion cavity 101, a connecting rod 6 is fixedly provided with a lantern ring 7, the lantern ring 7 is coaxially positioned with the diversion cavity 101, a rotating shaft 8 is fixedly connected to the middle part of one side of the swivel 5, the rotating shaft 8 is movably sleeved on the lantern ring 7, a swivel 9 is rotatably sleeved in the inner ring 103, a swivel 9 is rotatably sleeved in the swivel ring 103, a sliding rod 13 is fixedly connected to the inner side of the swivel rod 13, a sliding rod 13 is fixedly connected to the inner side of the swivel rod, and is fixedly connected to the inner end face of the swivel rod 13, 13 is fixedly arranged at the end of the swivel rod, 13, and is fixedly connected to the inner end of the swivel rod, 13, and the end of the swivel rod is fixedly connected to the end of the swivel rod, 13 and the end has a bottom rod is fixedly connected to the end rod, and 13 and the end rod 13 through the end rod and the end rod 13 through a spring and the end rod 13, when the fire-retardant core structure rotates, the fire-retardant core structure is driven to rotate through the rotating shaft 8, the fire-retardant filtering effect can be uniformly received all around, the guide ball 11 is positioned at the middle position of one side of the conical groove 102, the fire-retardant ring layer 4 is in a round table shape, one end with larger diameter of the fire-retardant ring layer 4 is fixedly connected with the rotating ring 3, one end with larger diameter is fixedly connected with the rotating head 5, the openings at two ends of the fire-retardant ring layer 4 are different in size, flame from the conical groove 102 can uniformly flow along the inner side of the fire-retardant ring layer 4 after being dispersed by the guide ball 11, then the flame flow horizontally impacted on the inner side surface of the fire-retardant ring layer 4 uniformly due to the inclined plane shape of the section of the fire-retardant ring layer 4, and the fire-retardant effect is further played due to the fact that the impact direction is perpendicular to the direction of the fire-retardant hole, and fault tolerance rate can be improved because of one-time impact is avoided.

Referring to fig. 3-7, an alarm 14 is fixedly mounted on the mounting plane of the connecting rod 6 on the outer ring of the housing 1, centrifugal holes 502 with one end communicated with the diversion cavity 101 are symmetrically formed at the top and the bottom of one side of the rotary head 5 close to the connecting rod 6, a first air cavity 503 is formed at the position of the rotary head 5 positioned between the two centrifugal holes 502, two ends of the first air cavity 503 are respectively communicated with the two centrifugal holes 502, a centrifugal slide block 15 is sleeved in the sliding hole 501 in a sliding manner, a corrugated pipe 16 and a third spring 17 are fixedly connected between the bottom surface of the centrifugal slide block 15 and the bottom wall of the centrifugal hole 502, the third spring 17 is positioned on the outer ring of the corrugated pipe 16, when no blockage exists in the fire-retarding core, a certain flow velocity is generated in the diversion cavity 101 by the normal circulating airflow or flame impact flow, so that the spiral blade 13 drives the fire-retarding core structure to rotate, at this time, the centrifugal slide block 15 in the centrifugal hole 502 is subjected to the centrifugal force greater than the elastic force of the third spring 17 so as to slide outwards, only when the rotary head 5 is not rotated, the centrifugal slide block 15 contracts towards the inside of the centrifugal hole 502 under the action of the third spring 17, the first sliding contact 18 and the second sliding contact 19 are driven to stretch out and draw back by the air pressure change of the first air cavity 503 and the second air cavity 801, the second air cavity 801 is arranged in the middle of the rotary shaft 8, the second air cavity 801 is communicated with the first air cavity 503, the annular groove 701 is arranged in the middle of the inner ring of the sleeve ring 7, the first conductive ring 20 and the second conductive ring 21 are symmetrically and fixedly arranged at two side walls of the annular groove 701 respectively, the first sliding groove 802 is arranged at the top of the second air cavity 801, the second sliding groove 803 is arranged at the bottom of the second air cavity 801, the first sliding contact 18 is sleeved in the first sliding groove 803 in a sliding manner, the second sliding contact 19 is sleeved in the second sliding groove 803 in a sliding manner, when the first sliding contact 18 and the second sliding contact 19 contact the first conductive ring 20 and the second conductive ring 21, the first sliding contact 18 and the second sliding contact 19 and the wires therebetween are used for indirectly connecting the first conductive ring 20 and the second conductive ring 21, so as to trigger the alarm 14 to alarm, the wires are fixedly connected between the first sliding contact 18 and the second sliding contact 19, the horizontal spacing distance between the first sliding groove 802 and the second air cavity 801 is equal to the horizontal spacing distance between the first conductive ring 20 and the second conductive ring 21 in the annular groove 701, the first conductive ring 20 is connected to the alarm 14 through the connecting rod 6 at the top, the second conductive ring 21 is connected to the alarm 14 through the connecting rod 6 at the bottom, the pressure exerted by the fire-retarding core structure at this time can be indicated to be maximum only when the end face of the rotating head 5 is attached to the side face of the lantern ring 7, that is, the inner blockage of the fire-retarding ring layer 4 seriously cannot lead gas and flame to flow through, at the moment, the rotary head 5 drives the outer ring end part of the rotary shaft 8 to slide to the inner ring of the sleeve ring 7, so that the first sliding groove 802 and the second sliding groove 803 correspond to the two side positions of the inner ring of the ring groove 701, the first sliding contact 18 and the second sliding contact 19 conveniently extend into the ring groove 701 and contact with the first conductive ring 20 and the second conductive ring 21, the first sliding contact 18 and the second sliding contact 19 are positioned in the inner ring of the ring groove 701 when the end surface of the rotary head 5 is jointed with the side surface of the sleeve ring 7, the third spring 17 pulls the centrifugal sliding block 15 to slide and compress the air pressure inside the first air cavity 503 towards the inside of the centrifugal hole 502 when the rotary speed of the rotary head 5 is lower than v, and is transferred to the second air cavity 801 to eject the first sliding contact 18 and the second sliding contact 19 to contact with the first conductive ring 20 and the second conductive ring 21 respectively, when the fire-retarding core structure receives a larger impact force, the fire-retarding core structure can slide to the maximum position, namely the end face of the rotary head 5 is attached to the end face of the lantern ring 7, but flame can normally circulate at the moment, and after the flame impact is finished, the fire-retarding core structure can be reset through the first spring 9, so that whether the fire-retarding core structure is blocked by the fire-retarding ring layer 4 or not needs to be detected through the rotating speed, and the detection accuracy is ensured.

Working principle: when the flame arrester is correctly installed in the pipeline, the conveyed combustible gas enters from the diversion port 201 at one end, then enters the conical groove 102, then enters the inner part of the flame-retardant ring layer 4, passes through the inner part of the flame-retardant ring layer 4 and enters the space of the diversion cavity 101 outside the flame-retardant ring layer, then continues to be conveyed backwards and flows out from the diversion port 201 at the other end, and when the gas flows through the inner part of the diversion cavity 101, the spiral blade 13 is driven to rotate, so that the spiral blade 13 and the rotating shaft 8 integrally rotate, the rotating head 5 is further driven to rotate, and the rotating head 5 drives the flame-retardant ring layer 4 and the rotating ring 3 to rotate together, so that the working condition of the inner part of the flame arrester under the condition of safely conveying the gas is completed;

when the front end pipeline transmits the airflow with flame, the airflow has larger impact force, firstly, the integral structure of the fire-retardant core is used, the whole swivel 3, the fire-retardant ring layer 4 and the swivel 5 are driven to move backwards together under the action of the impact force, namely, the swivel 3 slides outwards along the shrinkage groove 103 and drives the rotating shaft 8 to slide backwards along the lantern ring 7, the impact is reduced through the elastic force of the first spring 9, the impact action of the fire-retardant core is reduced, and the service life of the fire-retardant core is prolonged;

in the process of impacting the flame to the flame-retardant core structure, firstly, the flow guiding ball 11 is impacted, then, the flame is impacted to the flame-retardant ring layer 4 from the periphery under the drainage of the spherical surface of the flow guiding ball 11, and the flow guiding ball 11 compresses the sliding rod 10 to shrink towards the inside of the sliding hole 501, so that the dispersion condition of the flame by the flow guiding ball 11 is adjusted according to different flame impact conditions, and the dispersed flame enters from the inner side of the flame-retardant ring layer 4 and passes through meshes in the flame-retardant ring layer to be dissipated;

when the flame arrester works normally, whether the flammable gas with flame or not passes through the flame arrester core structure and needs to pass through the flame arrester ring layer 4, and circulation is formed in the diversion cavity 101, the spiral blade 13 is driven to rotate, so that the rotating head 5 is finally driven to have a certain rotation speed, when the rotation speed is smaller than v, namely, when the flame arrester ring layer 4 is blocked, serious gas passing property is poor, pressure in an inner ring space of the flame arrester ring layer 4 is caused, the rotating head 5 is enabled to slide to be attached to the side face of the lantern ring 7 under the action of the pressure, meanwhile, the outer ports of the first sliding groove 802 and the second sliding groove 803 are all positioned in the annular groove 701, at the moment, the rotation speed is low, namely, the centrifugal force borne by the centrifugal sliding block 15 is small, and the centrifugal sliding block 15 is driven to compress the corrugated pipe 16 under the action of the tension of the third spring 17, so that gas in the first gas cavity 503 is compressed into the rotating shaft 8, and the first sliding contact 18 in the first sliding groove 802 and the second sliding contact 19 in the second sliding groove are driven to stretch out, and extend to the inner part 701 to be respectively pressed to the first conductive ring 20 and the second conductive ring 803, so that the first conductive ring 21 and the first conductive ring 803 need to be connected to the first conductive ring 21 and the conductive ring 21 are triggered to be used for the safety inspection and the safety alarm, and the safety ring is required to be maintained.

Claims (7)

1. The utility model provides a petrochemical safety in production is with flame arrester, its characterized in that, including shell (1), shell (1)'s both ends fixed mounting has end shell (2), shell (1)'s inside has seted up water conservancy diversion chamber (101), shell (1) front end has seted up conical tank (102) with water conservancy diversion chamber (101) intercommunication, water conservancy diversion mouth (201) have been seted up at the middle part of end shell (2), water conservancy diversion mouth (201) and conical tank (102) intercommunication, water conservancy diversion chamber (101) lateral wall is located conical tank (102) outer lane department and has been seted up shrink groove (103), shrink groove (103) inside rotation cup joints swivel (3), the outer terminal surface fixed mounting of swivel (3) has fire-retardant ring layer (4), the other end fixedly connected with swivel (5) of fire-retardant ring layer (4), water conservancy diversion chamber (101) inner wall is located the even fixed mounting of swivel (5) side position department of connecting rod (6), fixed mounting has lantern ring (7) between the tip of connecting rod (6), and lantern ring (7) and water conservancy diversion chamber (101) are located conical tank (102) outer lane department, swivel ring (8) are close to swivel (8) one side movable connection pivot (8), the first spring (9) is movably sleeved in the shrinkage groove (103), and two ends of the first spring (9) are fixedly connected with the bottom wall of the shrinkage groove (103) and the bottom surface of the swivel (3) respectively.

2. The flame arrester for petrochemical safety production according to claim 1, wherein a slide hole (501) is formed in the middle of one side of the swivel (5) close to the flame retardant ring layer (4), a slide bar (10) is sleeved in the slide hole (501) in a sliding manner, a guide ball (11) is fixedly mounted at the outer end part of the slide bar (10), a second spring (12) is fixedly connected between the inner end surface of the slide bar (10) and the bottom wall of the slide hole (501), and a spiral blade (13) is fixedly mounted at the end part of the rotating shaft (8).

3. The flame arrester for petrochemical safety production according to claim 2, wherein the guide ball (11) is located at the middle position of one side of the conical groove (102), the flame-retardant ring layer (4) is in a shape of a round table, one end of the flame-retardant ring layer (4) with larger diameter is fixedly connected with the swivel (3), and one end with larger diameter is fixedly connected with the swivel (5).

4. The flame arrester for petrochemical safety production according to claim 2, characterized in that an alarm (14) is fixedly installed on an installation plane of the outer ring of the shell (1) on the connecting rod (6), one end of the rotating head (5) close to the top and the bottom of one side of the connecting rod (6) is symmetrically provided with a centrifugal hole (502) communicated with the diversion cavity (101), a first air cavity (503) is provided at the position of the rotating head (5) in the middle of the two centrifugal holes (502), two ends of the first air cavity (503) are respectively communicated with the two centrifugal holes (502), a centrifugal sliding block (15) is sleeved in the sliding hole (501) in a sliding mode, a corrugated pipe (16) and a third spring (17) are fixedly connected between the bottom surface of the centrifugal sliding block (15) and the bottom wall of the centrifugal hole (502), and the third spring (17) is located at the outer ring position of the corrugated pipe (16).

5. The flame arrester for petrochemical safety production according to claim 4, wherein the middle part of the rotating shaft (8) is provided with a second air cavity (801), the second air cavity (801) is communicated with the first air cavity (503), the middle part of the inner ring of the lantern ring (7) is provided with a ring groove (701), two side walls of the ring groove (701) are symmetrically and fixedly provided with a first conductive ring (20) and a second conductive ring (21) respectively, the top of the second air cavity (801) is provided with a first chute (802), the bottom of the second air cavity (801) is provided with a second chute (803), the inside of the first chute (802) is sleeved with a first sliding contact (18) in a sliding manner, and the inside of the second chute (803) is sleeved with a second sliding contact (19) in a sliding manner.

6. The flame arrester for petrochemical safety production according to claim 5, wherein a wire is fixedly connected between the first sliding contact (18) and the second sliding contact (19), the horizontal spacing distance between the first sliding groove (802) and the second air cavity (801) is equal to the horizontal spacing distance between the first conductive ring (20) and the second conductive ring (21) in the annular groove (701), the first conductive ring (20) is connected to the alarm (14) through a connecting rod (6) at the top, and the second conductive ring (21) is connected to the alarm (14) through a connecting rod (6) at the bottom.

7. The flame arrester for petrochemical safety production according to claim 6, wherein the first sliding contact (18) and the second sliding contact (19) are located in the inner ring of the ring groove (701) when the end face of the rotary head (5) is attached to the side face of the collar (7), and the third spring (17) pulls the centrifugal slider (15) to slide and compress the air pressure in the first air cavity (503) towards the inside of the centrifugal hole (502) when the rotating speed of the rotary head (5) is lower than v, and the air pressure is transmitted to the second air cavity (801) to eject the first sliding contact (18) and the second sliding contact (19) to be respectively contacted with the first conductive ring (20) and the second conductive ring (21).