CN117315870A - Fire alarm for fire engineering - Google Patents

Abstract

The invention relates to the field of fire protection, and discloses a fire alarm for fire engineering, which comprises an induction mechanism and an alarm mechanism, wherein the induction mechanism comprises an induction member and a trigger member, the induction member comprises a plurality of groups of induction units, the trigger member comprises a trigger unit, the induction unit transmits a fire signal to the trigger unit in a mechanical way, the trigger unit drives a spray head in the alarm mechanism to face a fire position in a mechanical way, the alarm mechanism comprises an outer housing and a mandrel vertically arranged in the outer housing, a control valve is arranged at the top of the mandrel, the bottom of the mandrel extends out of the outer housing and is provided with the spray head, a plurality of bottom spray holes which are vertically arranged are distributed at the bottom array of the spray head, a plurality of side spray holes which are distributed at the highest point are horizontally arranged, the rest side spray holes are inclined downwards and the angle of the rest side spray holes which are inclined downwards increases gradually from top to bottom along the vertical direction, and a buzzer is further arranged in the outer housing.

Description

Fire alarm for fire engineering

Technical Field

The invention relates to the field of fire protection, in particular to a fire alarm for fire engineering.

Background

In the life, fire control monitoring equipment is generally installed in buildings with large flow of people such as public places and warehouses and easy to fire, and is used for monitoring whether fire safety hidden danger occurs in the buildings in real time and playing a role in inhibiting fire when the fire occurs, in the prior art, real-time monitoring is commonly realized through a smoke sensor, when the fire occurs, the smoke sensor transmits smoke signals to a control main board, the control main board sends out signals to control the operation of a motor, and a fire control spray head is driven to rotate towards the fire occurrence position through motor technology and sprays fire extinguishing media, so that the purposes of fire alarm and fire inhibition are realized, however, the fire control main board has some defects: 1. when the smoke sensor is used for realizing fire early warning and monitoring, sometimes no or less smoke is generated at the beginning of fire combustion, so that the smoke sensor can not timely sense and the purposes of early warning and inhibiting fire can not be achieved; 2. the sensor is a precise electrical element, is arranged higher, is easy to reach early warning, is arranged lower or is arranged in a place easy to fire, is easy to be collided by surrounding pedestrians or objects, and is easy to damage; 3. the sensor technology and the motor technology are both supported by related circuits, the circuits are required to be maintained regularly so as not to be damaged and not to be known, fire protection early warning is affected, the related circuits of the whole fire protection structure are required to be checked by regular maintenance, the regular maintenance is more complicated and troublesome, and when a fire disaster occurs, if the related circuits are damaged due to fire, the whole fire protection monitoring equipment cannot be used; 4. the water outlet holes of the fire-fighting nozzle are generally arranged in a plurality of water outlet holes and distributed at the bottom and the side surfaces of the fire-fighting nozzle, referring to the left figure in fig. 14, the vertical line represents the water outlet track of the vertical water outlet hole arranged at the bottom of the fire-fighting nozzle, the parabola represents the water outlet track of the horizontal water outlet hole which faces the fire-fighting nozzle and is horizontally arranged, a spraying dead angle is obviously formed between the two water outlet holes, and if the fire spreads to the spraying dead angle, the fire cannot be effectively restrained.

Based on the above, the invention provides a fire alarm for fire engineering.

Disclosure of Invention

In order to solve the problems mentioned in the background, the invention provides a fire alarm for fire engineering.

In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows.

The fire alarm for the fire engineering comprises an induction mechanism and an alarm mechanism, wherein the induction mechanism comprises an induction member and a trigger member, the induction member comprises a plurality of groups of induction units, the trigger member comprises a trigger unit arranged in the alarm mechanism, the trigger unit is provided with a plurality of groups corresponding to the induction units, the induction unit transmits a fire signal to the trigger unit in a mechanical mode, and the trigger unit is used for driving a spray header in the alarm mechanism to face a fire position in a mechanical mode;

the alarm mechanism comprises an outer housing, an inner frame body is arranged in the outer housing, a mandrel which is vertically arranged and is in a hollow shaft shape is arranged on the inner frame body, a control valve is arranged at the top of the mandrel, and the bottom of the mandrel extends out of the outer housing and is provided with a spray header;

the bottom array of the spray header is provided with a plurality of bottom spray holes which are vertically arranged, the side array of the spray header is provided with a plurality of side spray holes, the side spray holes at the highest point are horizontally arranged, and the rest side spray holes are inclined downwards and the inclined angle is gradually increased from top to bottom along the vertical direction;

a buzzer is also arranged in the outer housing.

Further, the control valve comprises a valve shell, a valve core is sleeved in the valve shell, an L hole is formed in the valve core, a valve pipe extends at the lower orifice of the L hole, the bottom of the valve pipe is coaxially sleeved in the mandrel, a coil spring II is arranged between the valve core and the mandrel, the upper end of the valve core extends to form a valve shaft, the top of the valve shaft extends out of the valve shell, an arc groove is formed in the upper end face of the valve shell, a bulge extends to the outer circular surface of the valve shaft, and the bulge is slidably arranged in the arc groove;

the outer circle surface of the valve casing extends to be provided with a connecting pipe, the tail end of the connecting pipe is communicated with a water source, and the L-shaped hole is plugged by the cavity wall of the valve casing in the initial process.

Further, the switch for controlling the buzzer to be turned on comprises a first contact piece arranged on the valve shaft and a second contact piece arranged at the upper end of the valve casing, and when the control valve is turned on, the first contact piece is contacted with the second contact piece, and the switch is turned on.

Further, the induction unit comprises a mounting shell, a ratchet wheel is mounted in the mounting shell, a first coil spring is arranged at the mounting position, a movable support is slidably mounted in the mounting shell along the radial direction of the ratchet wheel, a pawl is arranged on one side, facing the ratchet wheel, of the movable support, and a first spring for driving the movable support to be far away from the ratchet wheel is also arranged in the mounting shell;

the installation shell is provided with a heat collecting plate, a glass column is arranged between the heat collecting plate and the movable support, alcohol or diethyl ether is arranged in the glass column, and initially, the glass column is propped down, the tail end of a pawl is inserted into a ratchet wheel, a first spring is compressed, and a first coil spring is in a compressed state;

a steel wire rope is arranged between the ratchet shaft of the ratchet wheel and the triggering unit.

Further, the triggering unit comprises a bracket body connected with the inner bracket body, and a reel and a sleeve shaft are arranged on the bracket body;

the reel is coaxial with the dabber, and the sleeve passes through the spline housing to be established in the dabber outside, and when the sleeve took place to remove along the axial lead, still keeps power connection through the spline between sleeve and the dabber, and the sleeve is located the below of reel and is provided with the spring two between the two, and the upper end of sleeve is provided with a plurality of along the circumferencial direction array and goes up the gear shaping, and the lower extreme of reel is provided with a plurality of down slot along the circumferencial direction array, and when the sleeve moved up, go up the gear shaping and can insert down in the slot.

Further, a sliding frame is arranged on the bracket body in a sliding manner along the horizontal direction, rollers which are vertically arranged are arranged on the sliding frame, and a spring III is arranged between the sliding frame and the bracket body;

the limiting frame is arranged on the bracket body along the radial sliding of the reel, the limiting frame is positioned between the carriage and the reel, a bolt extends on the limiting frame, a socket is arranged on the outer circular surface of the reel along the radial direction, a spring IV is arranged on one side, away from the carriage, of the limiting frame, the limiting frame is contacted with the carriage in the initial stage, and the bolt is inserted into the socket under the limitation of the carriage, and the spring IV is compressed;

one end of the steel wire rope is connected with the ratchet shaft, the other end of the steel wire rope bypasses the roller and is connected with the reel, and the connection position of the steel wire rope and the reel and the side spraying hole of the spraying head are positioned on the same side of the mandrel.

Further, the wire rope is wound at least two times on the reel.

Further, a clamping frame is slidably mounted on the support body along the vertical direction and is movably connected with the sleeve shaft, an inclined plane is arranged at the bottom of the clamping frame, and the inclined plane is in contact with the bottom of the sliding frame.

Compared with the prior art, the invention has the beneficial effects that:

1. the sensing unit in the scheme transmits a fire signal to the triggering unit in a mechanical mode, the triggering unit drives the control valve to open in a mechanical mode, drives the spray header to face the fire position and drives the buzzer switch to be closed, compared with the prior art, the mechanical fire alarm and fire suppression are more reliable, the sensing unit can be preset near the position easy to fire, the fire is sensed in the first time, the sensing is more sensitive and timely, and even if the sensing is collided by surrounding pedestrians or objects, the sensing is difficult to damage;

2. in this scheme, when taking place the fire, the shower nozzle is rotatory back orientation fire position of a plurality of circles, carries out the fire extinguishing medium when rotatory and sprays, and fire extinguishing medium can be water, and the benefit of a plurality of circles of rotations lies in: in the rotation process, part of fire extinguishing medium can be sprayed to the fire position to inhibit fire, the other part of fire extinguishing medium can be sprayed to the periphery of the fire position to form a fire isolation belt, then the fire extinguishing medium is continuously sprayed to the fire position to inhibit and even extinguish fire, and the purpose of forming the fire isolation belt is that if the fire isolation belt is not used, in the process of inhibiting the fire, if the fire is too large, the fire cannot be inhibited at the moment, when the fire is in play, the fire is easy to contact with surrounding objects to cause the fire of the surrounding objects, the fire isolation belt is reversely observed, the fire extinguishing medium exists on the surfaces of the surrounding objects, the fire is not easy to be triggered, and the spread of the fire can be effectively prevented;

3. in this scheme, the bottom array of shower head distributes and has a plurality of bottom spray holes that are vertical arrangement, and the side array of shower head distributes and has a plurality of side spray holes, and wherein, the side spray hole that is located the highest point is the horizontal arrangement, and other side spray holes slope downwards and the angle of downward slope is from top to bottom incremental along vertical direction, so, the spray range of shower head just is as shown in the right figure in fig. 14, and the vertical line represents the spray track of bottom spray hole, and the parabola represents the spray track of side spray hole, does not have the spray dead angle between the two, and the spray range is wider, and the effect of suppression fire is better.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic diagram of a sensing unit;

FIG. 3 is an internal schematic diagram of the sensing unit;

FIG. 4 is a schematic diagram of the structure of the alarm mechanism;

FIG. 5 is a schematic diagram of the interior of the alarm mechanism;

FIG. 6 is a second schematic diagram of the interior of the alarm mechanism;

FIG. 7 is a schematic diagram of the trigger unit from a top view;

FIG. 8 is a schematic diagram of the trigger unit in a bottom view;

FIG. 9 is a partial schematic view of a trigger unit;

FIG. 10 is a schematic view of a reel and sleeve;

FIG. 11 is a schematic view of a spindle, showerhead, and control valve;

FIG. 12 is a schematic diagram of a control valve;

FIG. 13 is a cross-sectional view of the control valve;

fig. 14 is a schematic view of a fire extinguishing medium spraying trajectory in the prior art and in the present solution.

The reference numerals in the drawings are:

100. an induction unit; 101. a mounting shell; 102. a ratchet wheel; 103. a pawl; 104. a movable bracket; 105. a first spring; 106. a first coil spring; 107. an induction column; 108. a heat collecting plate; 109. a wire rope; 200. an alarm mechanism; 201. an outer housing; 202. an inner frame body; 203. a buzzer; 204. a mandrel; 205. a spray header; 206. a control valve; 2061. a valve housing; 2062. a valve core; 2063. a valve shaft; 2064. an arc groove; 2065. a connecting pipe; 2066. a protrusion; 2067. l holes; 2068. a valve tube; 2069. a second coil spring; 300. a trigger unit; 301. a bracket body; 302. a reel; 303. a sleeve shaft; 304. a second spring; 305. a clamping frame; 3051. an inclined plane; 306. a carriage; 307. a third spring; 308. a roller; 309. a limiting frame; 310. a bolt.

Detailed Description

In order to further describe the technical means and effects adopted by the present invention for achieving the intended purpose, the following detailed description will refer to the specific implementation, structure, characteristics and effects according to the present invention with reference to the accompanying drawings and preferred embodiments.

Referring to fig. 1 to 14, a fire alarm for fire engineering includes a sensing mechanism and an alarm mechanism 200, wherein:

the sensing mechanism comprises a sensing member and a triggering member, and the triggering member is arranged in the alarm mechanism 200;

the sensing member is used for sensing whether fire occurs in the building or not, and mechanically transmitting a fire signal to the triggering member when the fire occurs, wherein the triggering member is triggered and drives the alarm mechanism 200 to be switched into an early warning state;

the alarm mechanism 200 is set to switch between the normal state and the early warning state, when no fire occurs, the alarm mechanism is in the normal state, when the fire occurs, the triggered component drives the switch to the early warning state, the alarm sound signal is sent out through the buzzer 203, meanwhile, the spray header 205 rotates for a plurality of circles and then faces the fire position, the fire extinguishing medium is sprayed while rotating, the fire extinguishing medium can be water, and the benefits of rotating for a plurality of circles are that: in the rotation process, part of fire extinguishing medium can be sprayed to the fire position to inhibit fire, and the other part of fire extinguishing medium can be sprayed to the periphery of the fire position to form a fire isolation belt, then, the fire extinguishing medium is continuously sprayed to the fire position to inhibit and even extinguish fire, and the purpose of forming the fire isolation belt is that if the fire isolation belt is not used, in the process of inhibiting the fire, if the fire is too large, the fire cannot be inhibited at the moment, then, when the fire is in play, the fire is easy to contact with surrounding objects to cause the fire of the surrounding objects, the fire isolation belt is reversely observed, the fire extinguishing medium exists on the surfaces of the surrounding objects, the fire is not easy to be caused, and the spread of the fire can be effectively prevented.

1. Sensing member:

referring to fig. 1, the sensing member includes a plurality of groups of sensing units 100, the sensing units 100 are distributed according to specific practical conditions in a building, for example, the sensing units 100 are arranged at positions where fires are likely to occur in the building one by one, and since the sensing units 100 mechanically transmit fire signals, the sensing units can be close to the fire positions, sense more sensitively, and even if the sensing units are collided by surrounding pedestrians or objects, the sensing units are difficult to damage and more reliable than the sensor technology.

Referring to fig. 2 and 3, the sensing unit 100 includes a mounting case 101, a ratchet 102 is mounted in the mounting case 101, a coil spring 106 is disposed at a mounting position, a movable bracket 104 is slidably mounted in the mounting case 101 along a radial direction of the ratchet 102, a pawl 103 is disposed at a side of the movable bracket 104 facing the ratchet 102, a tip of the pawl 103 is inserted into the ratchet 102, a spring 105 for driving the movable bracket 104 away from the ratchet 102 is disposed in the mounting case 101, the ratchet 102 and the pawl 103 form a ratchet pawl structure, and a ratchet shaft of the ratchet 102 can only rotate unidirectionally, which is achievable in the prior art.

The heat collecting plate 108 is installed on the installation shell 101, the induction column 107 is arranged between the heat collecting plate 108 and the movable support 104, the induction column 107 is a glass column with alcohol or diethyl ether arranged inside, and is broken when heated, initially, under the pushing of the induction column 107, the tail end of the pawl 103 is inserted into the ratchet 102, the first spring 105 is compressed, meanwhile, the first coil spring 106 is in a compressed state, in addition, a steel wire rope 109 is arranged between a ratchet shaft of the ratchet 102 and the triggering unit 300, when a fire occurs in a building, the heat collecting plate 108 is burned by fire, the glass column is broken easily, the first spring 105 releases elastic force, the pawl 103 leaves the ratchet 102, the first coil spring 106 releases elastic force, the ratchet shaft is wound on the ratchet shaft, and the triggering unit 300 is triggered by the action of the steel wire rope 109.

2. Alarm mechanism 200:

referring to fig. 4-6, the alarm mechanism 200 includes an outer casing 201, an inner frame 202 is disposed in the outer casing 201, a mandrel 204 which is vertically disposed and is in a hollow shaft shape is mounted on the inner frame 202, a control valve 206 is disposed at the top of the mandrel 204, and a spray header 205 is disposed at the bottom of the mandrel extending out of the outer casing 201.

Further, the bottom array of the spray header 205 is distributed with a plurality of bottom spray holes which are vertically arranged, the side array of the spray header 205 is distributed with a plurality of side spray holes, wherein the side spray holes at the highest point are horizontally arranged, the rest side spray holes are inclined downwards and the angle of the downward inclination is gradually increased from top to bottom along the vertical direction, so that the spray range of the spray header 205 is as shown in the right graph in fig. 14, the vertical line represents the spray track of the bottom spray holes, the parabola represents the spray track of the side spray holes, no spray dead angle exists between the two spray holes, the spray range is wider, and the effect of inhibiting fire is better.

Further, referring to fig. 12 and 13, the control valve 206 includes a valve housing 2061, a valve element 2062 is sleeved in the valve housing 2061, an L-shaped hole 2067 is provided in the valve element 2062, a valve tube 2068 extends from a lower orifice of the L-shaped hole 2067, a bottom of the valve tube 2068 is coaxially sleeved in the mandrel 204, and a coil spring two 2069 is provided between the valve element 2062 and the mandrel 204.

The valve shaft 2063 extends from the upper end of the valve element 2062, the valve shaft 2061 extends from the top of the valve shaft 2063, an arc groove 2064 is provided on the upper end surface of the valve shaft 2061, a protrusion 2066 extends from the outer circumferential surface of the valve shaft 2063, and the protrusion 2066 is slidably positioned in the arc groove 2064.

The outer circumferential surface of the valve housing 2061 is extended with a connection pipe 2065, the end of the connection pipe 2065 is connected with a water source, in addition, in the initial state, the L-shaped hole 2067 is blocked by the cavity wall of the valve housing 2061, when a fire occurs, the sensing unit 100 is matched with the triggering unit 300 to rotate the mandrel 204, the mandrel 204 rotates together with the valve core 2062 through the coil spring II 2069 at the beginning, when the boss 2066 contacts with the groove wall of the arc groove 2064 to limit the valve core 2062 to rotate continuously, the L-shaped hole 2067 is connected with the connection pipe 2065, the control valve 206 is opened, after that, the mandrel 204 rotates continuously, the side spraying hole on the spray header 205 faces the fire position after a plurality of turns, in this process, the control valve 206 remains in an opened state, and the coil spring II 2069 is compressed.

Further, as is clear from the above, when a fire occurs, the mandrel 204 rotates to bring the valve core 2062 to rotate by a preset angle so that the control valve 206 is opened, and then the valve core 2062 keeps the current position unchanged, based on which, a switch of the buzzer 203 can be arranged on the valve shaft 2063, for example, one contact piece of the switch is arranged on the valve shaft 2063, and the other contact piece is arranged at the upper end of the valve housing 2061, and when the control valve 206 is opened, the two contact pieces are contacted, so that when the fire occurs so that the alarm mechanism 200 is switched into an alarm state, the switch of the buzzer 203 can be mechanically closed, the buzzer 203 emits an alarm sound signal, further, a capacitor is connected in parallel with the circuit of the buzzer 203, the service life of the capacitor is long, and is not easy to damage relative to the battery, and the normal capacitor can store a part of electric power, and when the fire causes the circuit to be damaged, the capacitor can supply power to the buzzer 203, and the alarm sound signal is emitted without delaying the buzzer 203.

3. A trigger member:

referring to fig. 6, the triggering member includes a triggering unit 300 provided on the inner frame 202, and the triggering unit 300 is provided with several groups corresponding to the sensing units 100.

Referring to fig. 7-10, the trigger unit 300 includes a bracket body 301 connected to the inner bracket body 202, a reel 302 and a sleeve 303 are mounted on the bracket body 301, wherein, referring to fig. 10, the reel 302 and the mandrel 204 are coaxial but not connected, the sleeve 303 is sleeved outside the mandrel 204 in a spline manner, when the sleeve 303 moves along the axis, the sleeve 303 and the mandrel 204 still keep power connection through the spline, the sleeve 303 is positioned below the reel 302 and a spring two 304 is arranged between the sleeve 303 and the mandrel, in addition, a plurality of upper gear inserts are arranged at the upper end of the sleeve 303 in an array along the circumferential direction, a plurality of lower slots are arranged at the lower end of the reel 302 in an array along the circumferential direction, the upper gear inserts correspond to the lower slots, and when the sleeve 303 moves upwards, the upper gear inserts into the lower slots, the sleeve 303, the sleeve 302, the mandrel 204 and the lower slots form power connection, and can rotate together.

Referring to fig. 7 and 9, a carriage 306 is slidably mounted on the stand body 301 along the horizontal direction, a roller 308 arranged vertically is mounted on the carriage 306, and a third spring 307 is disposed between the carriage 306 and the stand body 301.

The bracket body 301 is provided with a limit frame 309 along the radial sliding of the reel 302, the limit frame 309 is positioned between the carriage 306 and the reel 302, a bolt 310 extends on the limit frame 309, an inserting opening is radially arranged on the outer circular surface of the reel 302, a spring IV is arranged on one side of the limit frame 309, which is away from the carriage 306, and initially, the limit frame 309 is contacted with the carriage 306, the bolt 310 is inserted into the inserting opening under the limit of the carriage 306, the spring IV is in a compressed state, the reel 302 cannot rotate, and when the limit of the limit frame 309 is removed by the carriage 306, the spring IV releases elastic force, the bolt 310 is separated from the inserting opening, and the reel 302 can rotate.

One end of the wire rope 109 is connected to the ratchet shaft, the other end is connected to the reel 302 after bypassing the roller 308, and the wire rope 109 is wound around the reel 302 at least two times, and referring to fig. 6, the connection position of the wire rope 109 to the reel 302 and the side shower hole of the shower head 205 are located on the same side of the mandrel 204.

Referring to fig. 8, a clamping frame 305 is slidably mounted on a bracket body 301 along a vertical direction, the clamping frame 305 is movably connected with a sleeve shaft 303, for example, connection is realized through a bearing, an inclined surface 3051 is arranged at the bottom of the clamping frame 305, the inclined surface 3051 is in contact with the bottom of a sliding frame 306, and when the sensing unit 100 senses a fire and withdraws a wire rope 109, the sliding frame 306 moves to push the clamping frame 305 to move upwards through the inclined surface 3051, and the clamping frame 305 moves upwards together with the sleeve shaft 303, so that the sleeve shaft 303, a winding wheel 302 and a mandrel 204 form power connection.

The working principle of the invention is as follows:

when a fire occurs, the heat collecting plate 108 in the sensing unit 100 near the fire position rapidly conducts heat to the sensing column 107 to break, the first spring 105 releases elastic force to enable the pawl 103 to leave the ratchet 102, the first coil spring 106 releases elastic force to enable the ratchet shaft to perform winding rotation, and in the winding process:

firstly, since the bolt 310 is inserted into the socket to limit the rotation of the reel 302, the wire rope 109 will pull the roller 308 and the carriage 306 to move, the carriage 306 moves to cancel the limit of the limit 309, the spring four releases the elastic force to move the limit 309, the bolt 310 leaves the socket, and simultaneously, the carriage 306 moves to push the clamping frame 305 to move upwards through the inclined plane 3051, the clamping frame 305 moves upwards together with the sleeve shaft 303, so that the sleeve shaft 303, the reel 302 and the mandrel 204 form a power connection;

then, the wire rope 109 rotates the reel 302 to pay out, the reel 302 rotates with the sleeve shaft 303 and rotates together with the mandrel 204, wherein, because the connection position of the wire rope 109 and the reel 302 and the side spraying hole of the spraying head 205 are positioned on the same side of the mandrel 204, after the wire rope 109 on the reel 302 is released, the connection position of the wire rope 109 and the reel 302 faces to the fire position, and then the side spraying hole of the spraying head 205 faces to the fire position, and in the process, the mandrel 204 rotates to open the control valve 206, water is sprayed as fire extinguishing medium through the spraying head 205, the switch of the buzzer 203 is closed, and the buzzer 203 sends out an alarm sound signal.

The present invention is not limited to the above embodiments, but is capable of modification and variation in detail, and other modifications and variations can be made by those skilled in the art without departing from the scope of the present invention.

Claims (8)

1. Fire alarm for fire engineering, it includes sensing mechanism and alarm mechanism (200), its characterized in that: the sensing mechanism comprises a sensing member and a triggering member, the sensing member comprises a plurality of groups of sensing units (100), the triggering member comprises a triggering unit (300) arranged in the alarm mechanism (200), the triggering unit (300) is provided with a plurality of groups corresponding to the sensing units (100), the sensing unit (100) is used for transmitting a fire signal to the triggering unit (300) in a mechanical mode, and the triggering unit (300) is used for driving a spray header (205) in the alarm mechanism (200) to face a fire position in a mechanical mode;

the alarm mechanism (200) comprises an outer cover shell (201), an inner frame body (202) is arranged in the outer cover shell (201), a mandrel (204) which is vertically arranged and is in a hollow shaft shape is arranged on the inner frame body (202), a control valve (206) is arranged at the top of the mandrel (204), and a spray header (205) extends out of the outer cover shell (201) from the bottom of the mandrel;

a plurality of bottom spray holes which are vertically arranged are distributed in the bottom array of the spray header (205), a plurality of side spray holes are distributed in the side surface array of the spray header (205), the side spray holes at the highest point are horizontally arranged, and the rest side spray holes are inclined downwards and the inclined angle is gradually increased from top to bottom along the vertical direction;

a buzzer (203) is also arranged in the outer housing (201).

2. A fire alarm for fire engineering according to claim 1, wherein: the control valve (206) comprises a valve shell (2061), a valve core (2062) is sleeved in the valve shell (2061), an L-shaped hole (2067) is formed in the valve core (2062), a valve tube (2068) is extended at the lower orifice of the L-shaped hole (2067), the bottom of the valve tube (2068) is coaxially sleeved in the mandrel (204), a coil spring II (2069) is arranged between the valve core (2062) and the mandrel (204), a valve shaft (2063) is extended at the upper end of the valve core (2062), the valve shell (2061) extends out of the top of the valve shaft (2063), an arc groove (2064) is formed in the upper end face of the valve shell (2061), a protrusion (2066) is extended on the outer circular surface of the valve shaft (2063), and the protrusion (2066) is slidably positioned in the arc groove (2064);

the outer circumferential surface of the valve housing (2061) is extended with a connection pipe (2065), the end of the connection pipe (2065) is communicated with a water source, and the L-shaped holes (2067) are blocked by the cavity wall of the valve housing (2061) in the initial stage.

3. A fire alarm for fire engineering according to claim 2, wherein: the switch for controlling the buzzer (203) to be turned on comprises a first contact piece arranged on the valve shaft (2063) and a second contact piece arranged at the upper end of the valve casing (2061), and when the control valve (206) is turned on, the first contact piece is contacted with the second contact piece, and the switch is turned on.

4. A fire alarm for fire engineering according to claim 1 or 2, wherein: the induction unit (100) comprises a mounting shell (101), a ratchet wheel (102) is mounted in the mounting shell (101), a coil spring I (106) is arranged at the mounting position, a movable support (104) is slidably mounted in the mounting shell (101) along the radial direction of the ratchet wheel (102), a pawl (103) is arranged on one side, facing the ratchet wheel (102), of the movable support (104), and a spring I (105) which is elastic and used for driving the movable support (104) to be far away from the ratchet wheel (102) is further arranged in the mounting shell (101);

a heat collecting plate (108) is arranged on the mounting shell (101), a glass column is arranged between the heat collecting plate (108) and the movable bracket (104), alcohol or diethyl ether is arranged in the glass column, and initially, the tail end of the pawl (103) is inserted into the ratchet wheel (102) under the pushing of the glass column, the spring I (105) is compressed, and the coil spring I (106) is in a compressed state;

a steel wire rope (109) is arranged between the ratchet shaft of the ratchet (102) and the triggering unit (300).

5. A fire alarm for fire engineering according to claim 4, wherein: the triggering unit (300) comprises a bracket body (301) connected with the inner bracket body (202), and a reel (302) and a sleeve shaft (303) are arranged on the bracket body (301);

reel (302) and dabber (204) are coaxial, sleeve (303) are established in dabber (204) outside through the spline housing, when sleeve (303) take place to remove along the axial lead, still keep power connection through the spline between sleeve (303) and dabber (204), sleeve (303) are located the below of reel (302) and are provided with spring two (304) between the two, the upper end of sleeve (303) is provided with a plurality of upper gear shaping along the circumferencial direction array, the lower extreme of reel (302) is provided with a plurality of lower slot along the circumferencial direction array, when sleeve (303) are moved up, upper gear shaping can insert in the lower slot.

6. A fire alarm for fire engineering according to claim 5, wherein: a sliding frame (306) is arranged on the bracket body (301) in a sliding manner along the horizontal direction, a roller (308) which is vertically arranged is arranged on the sliding frame (306), and a spring III (307) is arranged between the sliding frame (306) and the bracket body (301);

a limit frame (309) is arranged on the bracket body (301) along the radial direction of the reel (302) in a sliding manner, the limit frame (309) is positioned between the carriage (306) and the reel (302), a bolt (310) extends on the limit frame (309), a socket is arranged on the outer circular surface of the reel (302) along the radial direction, a spring IV is arranged on one side, away from the carriage (306), of the limit frame (309), the limit frame (309) is contacted with the carriage (306) in the initial stage, and the bolt (310) is inserted into the socket under the limit of the carriage (306), and the spring IV is compressed;

one end of the steel wire rope (109) is connected with the ratchet shaft, the other end of the steel wire rope bypasses the roller (308) and then is connected with the reel (302), and the connection position of the steel wire rope (109) and the reel (302) and the side spraying hole of the spraying head (205) are positioned on the same side of the mandrel (204).

7. A fire alarm for fire engineering according to claim 6, wherein: the wire rope (109) is wound around the reel (302) at least two times.

8. A fire alarm for fire engineering according to claim 6, wherein: the clamping frame (305) is slidably mounted on the bracket body (301) along the vertical direction, the clamping frame (305) is movably connected with the sleeve shaft (303), an inclined surface (3051) is arranged at the bottom of the clamping frame (305), and the inclined surface (3051) is contacted with the bottom of the sliding frame (306).