A fire alarm system for network computer rooms

Abstract

The present invention relates to a fire alarm system for a network computer room applied in the alarm field. In the case of smoke alarm in the prior art, a phenomenon alarm is auxiliaryly arranged, which can produce obvious changes when smoldering occurs in the computer room, and feedback to the control center is realized through a self-inspection robot, so that an alarm is issued when smoldering occurs and no open flame occurs. Compared with only performing a smoke alarm, the fire prevention effect on the computer room is greatly improved, and the loss in the computer room is effectively reduced. In addition, in conjunction with the setting of multiple front monitoring modules, when the self-inspection robot is not inspecting, the temperature of the equipment can be spontaneously monitored. When the temperature threshold is reached, the foam fire extinguishing module is triggered to perform foam fire extinguishing, thereby replacing the sprinkler water fire extinguishing in the prior art, which can effectively reduce the loss in the computer room.

Description

Technical Field

[0001] The present invention relates to a fire alarm system for a network room, and in particular to a fire alarm system for a network room applied in the alarm field. Background Art

[0002] The power consumption of a computer room is 4-5 times that of an ordinary office. The cabinet power supply is the bottleneck of the electrical safety of the computer room. The load often exceeds the carrying capacity of the connection and circuit structure, causing heat accumulation, sparks, circuit breaks, data loss, and even electrical fires. When the temperature measured by the sensor in the fire automatic alarm linkage system reaches its preset value, an alarm will be issued.

[0003] The existing automatic fire alarm system is mainly a smoke alarm, which can detect smoke and give an alarm. However, due to long-term high-load operation, the insulation layer of some electrical lines will age faster due to high temperature, which can easily lead to smoldering. Sufficient heat may be generated in low-voltage lines (such as signal lines) to ignite nearby combustible materials.

[0004] The characteristics of this type of smoldering combustion are long spread time, small amount of smoke, and difficulty in early detection. Once discovered, it has often formed an open flame, delaying the time for early fire extinguishing. The existing method of identifying smoke alarms is obviously insufficient to meet the fire protection requirements of the computer room. Summary of the invention

[0005] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the existing smoke alarm method is difficult to adapt to and difficult to meet the fire protection requirements of a computer room where smoldering is prone to occur.

[0006] In order to solve the above problems, the present invention provides a fire alarm system for a network computer room, comprising a control center located in a property monitoring center, a smoke alarm and an audible and visual alarm installed in the computer room, a plurality of phenomenon alarms, and a self-inspection robot for automatic inspection, wherein the smoke alarm, the audible and visual alarm, and the self-inspection robot are all connected to the control center by signal;

[0007] The phenomenon alarm includes a heat-conducting base plate and an outer protective cover clamped on the top of the heat-conducting base plate. A plurality of abnormal sensing rods are fixedly connected inside the heat-conducting base plate. The abnormal sensing rods include an outer sleeve fixedly connected to the heat-conducting base plate, a temperature-changing strip fixedly connected to the top of the outer sleeve, and a sensing layer wrapped around the temperature-changing strip. The sensing layer is in close contact with the inner wall of the outer sleeve, and the sensing layer does not contact with the bottom of the outer sleeve. A plurality of heat-conducting rods distributed in a circular array are fixedly connected to the inner wall of the outer sleeve. The upper and lower ends of the heat-conducting rods are respectively in contact with the outer protective cover and the heat-conducting base plate. The upper ends of the abnormal sensing rods are all threadedly connected to bronchi, and the upper ends of the plurality of bronchi are fixedly connected to the main air pipe. The upper end of the main air pipe passes through the outer protective cover and extends outside the outer protective cover, and the bronchi are communicated with the corresponding temperature-changing strips.

[0008] In the above-mentioned fire alarm system for network computer rooms, in the case of smoke alarm in the prior art, a phenomenon alarm is auxiliaryly set up, which can produce obvious changes when smoldering occurs in the computer room, and feedback to the control center is realized through the self-inspection robot, so that an alarm is issued when there is smoldering and no open flame. Compared with only smoke alarm, the fire prevention effect of the computer room is greatly improved, and the loss in the computer room is effectively reduced.

[0009] As a further improvement of the present application, the outer shield and the outer sleeve are both transparent structures, and the main air pipe is in a normally closed state.

[0010] As a further improvement of the present application, the sensing layer is made of hot-melt material, and the multiple sensing layers have different colors. The hot-melt temperature gradient of the multiple sensing layers increases from left to right, and the lowest hot-melt temperature of the sensing layer is consistent with the highest safe operating temperature of the corresponding equipment.

[0011] As a further improvement of the present application, the temperature change strip includes multiple temperature-sensing airbags and multiple elastic tubes respectively fixedly connected between two temperature-sensing airbags, adjacent temperature-sensing airbags and elastic tubes are communicated, the uppermost temperature-sensing airbag is fixedly connected to the top of the outer protective cover, and isolation strings are arranged in the multiple elastic tubes, and the multiple isolation strings respectively penetrate the upper elastic tubes and temperature-sensing airbags and extend into the bronchus, and the end of the isolation string located in the bronchus is fixedly connected to the inner wall of the bronchus.

[0012] As a further improvement of the present application, the isolation string includes a tube blocking strip that is interference fit with the elastic tube and a drawstring fixedly connected between the upper end of the tube blocking strip and the inner wall of the bronchus, and the multiple drawstrings have different colors.

[0013] As a further improvement of the present application, the temperature-sensing airbag and the elastic tube are both elastic sealing structures, and each temperature-sensing airbag is filled with compressed inert gas.

[0014] As another improvement of the present application, it also includes multiple front monitoring modules arranged corresponding to the equipment in the computer room, the front monitoring modules include a temperature sensor and a positioning module installed on the corresponding equipment, and the multiple front monitoring modules also jointly include a foam fire extinguishing module, the foam fire extinguishing module includes multiple metal storage tanks installed at multiple corners of the computer room, two groups of foam nozzles located on the top and the floor of the computer room respectively, and multiple guide pipes connecting the foam nozzles and adjacent metal storage tanks, solenoid valves are installed on the multiple guide pipes, and a foam pump is installed on each metal storage tank, and the solenoid valves and the foam pumps are both connected to the control center signal.

[0015] As another improved supplement of the present application, each group of foam nozzles is provided with multiple ones, and the multiple foam nozzles on the top of the machine room are respectively provided corresponding to multiple machine room equipment, and the multiple foam nozzles on the floor of the machine room are respectively located between multiple adjacent equipment.

[0016] As another improved supplement to the present application, the foam nozzle includes a sizing metal tube connected to the guide tube through an electric rotating shaft, a reducing nozzle fixedly connected to the sizing metal tube, and an electric control ring electrically connected to the top of the reducing nozzle. The electric control ring and the electric rotating shaft are both connected to the control center signal. A plurality of groups of lining strips are fixedly inlaid inside the reducing nozzle. Each group of lining strips includes a side bone rod, an active bone rod and two driven bone rods. The active bone rod is located between the two driven bone rods, and the side bone rod is located on the side of one of the driven bone rods away from the active bone rod.

[0017] As another improved supplement of the present application, multiple groups of lining strips extend to the lower side of the variable diameter nozzle, and sizing ropes are connected between the multiple groups of lining strips, and the sizing ropes pass through the middle parts of all side bone rods, active bone rods and driven bone rods. The side bone rods and active bone rods are made of electromagnetic materials, the driven bone rods are made of magnetic materials, and there is magnetic attraction between the driven bone rods and the energized side bone rods and active bone rods.

[0018] To sum up, in the case of smoke alarm in the prior art, an auxiliary phenomenon alarm is set up, which can produce obvious changes when smoldering occurs in the computer room. The self-inspection robot can provide feedback to the control center to achieve an alarm when there is smoldering and no open flame. Compared with only smoke alarm, the fire prevention effect of the computer room is greatly improved, and the loss in the computer room is effectively reduced. In addition, with the setting of multiple front monitoring modules, when the self-inspection robot is not inspecting, it can also spontaneously monitor the equipment temperature. When the temperature threshold is reached, the foam fire extinguishing module is triggered to perform foam fire extinguishing, thereby replacing the sprinkler water fire extinguishing in the prior art, which can effectively reduce the loss of the computer room. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the main system block diagram of the first implementation method of this application;

[0020] Figure 2 This is the internal plan view of the computer room of the first embodiment of the present application;

[0021] Figure 3 This is a schematic diagram of a phenomenon alarm according to a first embodiment of the present application;

[0022] Figure 4 A top view of an image alarm according to a first embodiment of the present application;

[0023] Figure 5 This is a diagram showing the changing process of the indicator strip in the first embodiment of the present application under the smoldering condition;

[0024] Figure 6 This is a schematic diagram of the elastic tube portion of the first embodiment of the present application;

[0025] Figure 7 This is a schematic diagram of the abnormality sensing rod in the first embodiment of the present application after detecting a temperature rise;

[0026] Figure 8 This is the main system block diagram of the second implementation method of this application;

[0027] Fig. 9 This is the internal plan view of the computer room of the second embodiment of the present application;

[0028] Fig.10 This is a partial schematic diagram of a foam fire extinguishing module according to a second embodiment of the present application;

[0029] Fig.11 A three-dimensional diagram of a foam spray head according to a second embodiment of the present application;

[0030] Fig.12 for Fig.11 Schematic diagram at A in the middle;

[0031] Fig.13 This is a three-dimensional diagram of the variable-diameter nozzle of the second embodiment of the present application in a closed state;

[0032] Description of the numbers in the figure:

[0033] 1 metal storage tank, 2 foam nozzle, 21 variable diameter nozzle, 22 sizing metal tube, 23 electric control ring, 31 side bone rod, 32 active bone rod, 33 driven bone rod, 34 sizing rope, 4 phenomenon alarm, 41 outer shield, 42 heat conductive bottom plate, 51 main air pipe, 52 bronchial pipe, 6 outer sleeve, 601 heat conductive rod, 7 temperature change strip, 71 temperature sensing airbag, 72 elastic tube, 731 pipe blocking strip, 732 pull rope. DETAILED DESCRIPTION

[0034] Two implementation modes of the present application are described in detail below with reference to the accompanying drawings.

[0035] The first implementation method:

[0036] Figure 1 and Figure 2 A fire alarm system for a network computer room is shown, in which a represents a computer room, and b represents equipment in the computer room, including a control center located in a property monitoring center, a smoke alarm and an audible and visual alarm installed in the computer room, a plurality of phenomenon alarms, and a self-inspection robot for automatic inspection. The smoke alarm, the audible and visual alarm, and the self-inspection robot are all connected to the control center signal, and the audible and visual alarm is used to assist the smoke alarm, and the two alarm synchronously to enhance the alarm conspicuity;

[0037] like Figure 3In the figure, c represents the sensing layer. The phenomenon alarm includes a heat-conducting bottom plate 42 and an outer shield 41 clamped on the top of the heat-conducting bottom plate 42. A plurality of abnormal sensing rods are fixedly connected inside the heat-conducting bottom plate 42. The abnormal sensing rods include an outer sleeve 6 fixedly connected to the heat-conducting bottom plate 42, a temperature-changing strip 7 fixedly connected to the top of the outer sleeve 6, and a sensing layer wrapped around the temperature-changing strip 7. The sensing layer is in close contact with the inner wall of the outer sleeve 6, and the sensing layer is not in contact with the bottom of the outer sleeve 6. When in use, multiple phenomenon alarms 4 are placed in places where high temperature is likely to occur in the equipment and where the cables in the machine room are densely packed. In areas prone to smoldering, such as distribution areas, after an abnormal increase in temperature, the sensing layer gradually collapses from bottom to top, causing the binding force on the temperature-changing strip 7 to gradually decrease, causing the temperature-changing strip 7 to undergo an obvious volume change. When the inspection robot arrives at that location, it can obtain image information of the change and feed it back to the control center. The control center determines the possibility of smoldering based on the image information, and detects it before smoldering and open flame occurs, thereby taking corresponding measures to effectively avoid the occurrence of fire. Compared with the monitoring and alarm method of smoke alarms, it has better effects and higher safety.

[0038] like Figure 4 The inner wall of the outer sleeve 6 is fixedly connected with a plurality of heat-conducting rods 601 distributed in a circular array. The heat-conducting rods 601 can be used for heat conduction, so that the heat at the heating point is transferred toward the sensing layer. The upper and lower ends of the heat-conducting rods 601 are respectively in contact with the outer shield 41 and the heat-conducting bottom plate 42. The upper ends of the abnormal sensing rods are all threadedly connected with bronchial tubes 52. The upper ends of the plurality of bronchial tubes 52 are fixedly connected with the main air pipes 51. The upper ends of the main air pipes 51 penetrate the outer shield 41 and extend to the outside of the outer shield 41. The bronchial tubes 52 are connected with the corresponding temperature change strips 7. Figure 7 After the temperature abnormality causes the temperature-variable strip 7 to expand, when the outer sleeve 6 and the temperature-variable strip 7 need to be restored, the abnormal sensing rod can be inverted and heated to make the sensing layer completely melt and completely cover and wrap the temperature-variable strip 7, and then the air is pumped outwards through the main air pipe 51 to make the temperature-variable strip 7 deflate. At the same time, when the hot-melt sensing layer gradually solidifies but has not yet completely solidified, the temperature-variable strip 7 is inflated again to make the temperature-variable strip 7 saturated with inert gas. The incompletely solidified sensing layer undergoes adaptive micro-deformation under the action of air pressure, and then the main air pipe 51 is blocked. At this time, after the temperature sensing layer is completely solidified, the temperature-variable strip 7 is restricted, and then gas is inflated again to make the inert gas in the temperature-variable strip 7 in a compressed state, thereby realizing the restoration of the phenomenon alarm 4 and facilitating reuse.

[0039] The outer protective cover 41 and the outer sleeve 6 are both transparent structures, and the main air pipe 51 is in a normally closed state, so that the gas in the temperature-changing strip 7 is not easy to leak out. When the temperature is too high and the sensing layer is melted and loses its restraint on the temperature-changing strip 7, the temperature-changing strip 7 can expand smoothly, making the abnormal information more obvious, and making the abnormal image information obtained by the self-inspection robot clearer and more effective than when there is no abnormality.

[0040] The sensing layer is made of hot-melt material, and the colors of multiple sensing layers are different. From left to right, the hot-melt temperature gradient of multiple sensing layers increases. According to the colors of different hot-melt sensing layers, the approximate situation of smoldering can be judged, so that the staff can take corresponding measures more accurately after receiving the alarm information. The lowest hot-melt temperature of the sensing layer is consistent with the highest safe operating temperature of the corresponding equipment. As long as the self-inspection robot obtains the image information of the hot-melt in the sensing layer, it can be said that there is smoldering and abnormal situation, making the fire prevention monitoring of unmanned computer rooms more comprehensive and effective.

[0041] like Figure 5 The temperature-changing strip 7 includes a plurality of temperature-sensing airbags 71 and a plurality of elastic tubes 72 respectively fixedly connected between two temperature-sensing airbags 71. Adjacent temperature-sensing airbags 71 and elastic tubes 72 are connected. The uppermost temperature-sensing airbag 71 is fixedly connected to the inner top of the outer shield 41. Figure 6 , multiple elastic tubes 72 are each provided with an isolation string, and the multiple isolation strings respectively penetrate the upper elastic tube 72 and the temperature-sensing airbag 71 and extend into the bronchus 52, and the end of the isolation string located in the bronchus 52 is fixedly connected to the inner wall of the bronchus 52, the temperature-sensing airbag 71 and the elastic tube 72 are both elastic sealing structures, and each temperature-sensing airbag 71 is filled with compressed inert gas.

[0042] The isolation string includes a tube blocking strip 731 that is interference fit with the elastic tube 72 and a drawstring 732 that is fixedly connected between the upper end of the tube blocking strip 731 and the inner wall of the bronchus 52. The multiple drawstrings 732 have different colors. In the process of restoring the abnormal sensing rod, after solidification, when the inert gas is filled again, the multiple drawstrings 732 can be pulled from bottom to top in sequence to embed the tube blocking strip 731 into the corresponding elastic tube 72, so that the multiple temperature-sensing airbags 71 are relatively independent, and when subjected to high temperature, the compressed gas loses the restraint of the sensing layer and expands. At the same time, under the action of high temperature, the expansion amplitude increases, so that the mouth of the elastic tube 72 is slightly expanded, and the compressed gas pushes the tube blocking strip 731, so that the tube blocking strip 731 can be squeezed into the temperature-sensing airbag 71 above, and the longer the temperature abnormality lasts, the more the number of tube blocking strips 731 that are moved, so that according to the image information, the approximate duration of the smoldering phenomenon can also be effectively judged, so that the staff can roughly understand the specific situation before arriving at the scene, and can deal with it in a targeted manner.

[0043] In the above-mentioned fire alarm system for network computer rooms, in the case of smoke alarm in the prior art, a phenomenon alarm is auxiliaryly set up, which can produce obvious changes when smoldering occurs in the computer room, and feedback to the control center is realized through the self-inspection robot, so that an alarm is issued when there is smoldering and no open flame. Compared with only smoke alarm, the fire prevention effect of the computer room is greatly improved, and the loss in the computer room is effectively reduced.

[0044] The second implementation method:

[0045] Based on the first embodiment, this embodiment adds a front monitoring module and its related contents, so that this embodiment can not only assist the phenomenon alarm to monitor the temperature of the equipment in the machine room, but also perform foam fire extinguishing operations in time after an abnormality. The rest of the parts are consistent with the first embodiment.

[0046] Figure 8 and Fig. 9 A fire alarm system for a network computer room is shown, which also includes a plurality of front monitoring modules corresponding to the equipment in the computer room, the front monitoring modules include a temperature sensor and a positioning module installed on the corresponding equipment, and the plurality of front monitoring modules also include a foam fire extinguishing module, the foam fire extinguishing module includes a plurality of metal storage tanks 1 installed at a plurality of corners of the computer room, two groups of foam nozzles 2 respectively located on the top and the floor of the computer room, a plurality of guide pipes connecting the foam nozzles 2 and adjacent metal storage tanks 1, the metal storage tanks 1 are filled with foam for fire extinguishing, a plurality of guide pipes are installed with electromagnetic valves, and a foam pump is installed on each metal storage tank 1 The solenoid valve and the foam pump are connected to the control center signal. Each group of foam nozzles 2 is provided with multiple ones, and the multiple foam nozzles 2 on the top of the computer room are respectively provided corresponding to multiple computer room equipment. The multiple foam nozzles 2 on the floor of the computer room are respectively located between multiple adjacent equipment. The temperature sensor of the front monitoring module can more intuitively detect the temperature of the corresponding equipment. When it is higher than the threshold, it means that there is a more serious fire risk. When the measured temperature exceeds the threshold, the control center can control the foam nozzle 2 near the corresponding equipment to spray foam on it, so as to avoid open flames caused by high temperature, improve the fire prevention effect, and reduce the incidence of fire in the computer room.

[0047] In addition, the temperature threshold set on the temperature sensor is higher than the maximum safe operating temperature of the corresponding equipment, and is also higher than the highest hot melt temperature of the sensing layer in the corresponding phenomenon alarm 4, so that the foam is not easy to spray out before the temperature causes a fire, effectively avoiding the difficulty of subsequent cleaning.

[0048] Fig.10 and Fig.11 As shown, the foam nozzle 2 includes a calibrated metal tube 22 connected to the guide tube through an electric shaft, a variable diameter nozzle 21 fixedly connected to the calibrated metal tube 22, and an electric control ring 23 electrically connected to the top of the variable diameter nozzle 21. The electric control ring 23 and the electric shaft are both connected to the control center signal. The foam nozzle 2 can be rotated under the control of the control center through the electric shaft, so that the range of spraying foam can be increased and changed. The variable diameter nozzle 21 is fixedly inlaid with multiple groups of lining strips, such as Fig.12Each group of lining strips includes a side bone rod 31, an active bone rod 32 and two driven bone rods 33. The active bone rod 32 is located between the two driven bone rods 33. The side bone rod 31 is located on the side of one of the driven bone rods 33 away from the active bone rod 32. Multiple groups of lining strips extend to the lower side of the variable diameter nozzle 21. Sizing ropes 34 are connected between multiple groups of lining strips, and the sizing ropes 34 pass through the middle of all the side bone rods 31, the active bone rods 32 and the driven bone rods 33. The side bone rods 31 and the active bone rods 32 are made of electromagnetic materials, and the driven bone rods 33 are made of magnetic materials. There is magnetic attraction between the driven bone rods 33 and the energized side bone rods 31 and the active bone rods 32.

[0049] The multiple active bone rods 32 and the electric control ring 23, as well as the multiple side bone rods 31 and the electric control ring 23 are electrically connected via circuits, and the connection circuits of the two are different, so that the control center can control different circuits to be energized, so that the active bone rods 32 and the side bone rods 31 can be energized asynchronously.

[0050] When foam fire protection is not used, Fig.13 , the plurality of side frame rods 31 or the plurality of active frame rods 32 can be energized first, so that they can attract the adjacent driven frame rods 33, so that the lower mouth of the variable-diameter nozzle 21 is gathered, and then the plurality of side frame rods 31 or the plurality of active frame rods 32 that are not energized can be energized, so that the variable-diameter nozzle 21 is gathered again, so that the lower mouth thereof changes from large to small, which can effectively protect the mouth of the sizing metal pipe 22, so that it is not easily affected by dust and foreign matter when it is not used for a long time, and effectively ensure that when it is necessary to spray foam, it is not easy to be blocked by foreign matter and it is difficult to spray foam, thereby improving the fire prevention effect.

[0051] In summary, in the case of smoke alarm in the prior art, an auxiliary phenomenon alarm is set up, which can produce obvious changes when smoldering occurs in the computer room. The self-inspection robot can provide feedback to the control center to achieve an alarm when there is smoldering and no open flame. Compared with only smoke alarm, the fire prevention effect of the computer room is greatly improved, and the loss in the computer room is effectively reduced. In addition, with the setting of multiple front monitoring modules, when the self-inspection robot is not patrolling, it can also spontaneously monitor the equipment temperature. When the temperature threshold is reached, the foam fire extinguishing module is triggered to perform foam fire extinguishing, thereby replacing the sprinkler water fire extinguishing in the prior art, which can effectively reduce the loss of the computer room.

[0052] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A fire alarm system for a network room, characterized in that: It includes a control center located in the property monitoring center, a smoke alarm and an audible and visual alarm installed in a machine room, a plurality of phenomenon alarms, and a self-inspection robot for automatic inspection, wherein the smoke alarm, the audible and visual alarm, and the self-inspection robot are all connected to the control center by signal; The phenomenon alarm comprises a heat-conducting base plate (42) and an outer protective cover (41) clamped on the top of the heat-conducting base plate (42); a plurality of abnormal sensing rods are fixedly connected inside the heat-conducting base plate (42); the abnormal sensing rods comprise an outer sleeve (6) fixedly connected to the heat-conducting base plate (42), a temperature-changing strip (7) fixedly connected to the top of the outer sleeve (6), and a sensing layer wrapped around the temperature-changing strip (7); the sensing layer is in close contact with the inner wall of the outer sleeve (6), and the sensing layer does not contact the bottom of the outer sleeve (6); The inner wall of the outer sleeve (6) is fixedly connected to a plurality of heat-conducting rods (601) distributed in a circular array, the upper and lower ends of the heat-conducting rods (601) are in contact with the outer protective cover (41) and the heat-conducting bottom plate (42) respectively, the upper ends of the abnormal sensing rods are all threadedly connected to the bronchus (52), the upper ends of the plurality of bronchus (52) are fixedly connected to the main air pipe (51), the upper ends of the main air pipe (51) penetrate the outer protective cover (41) and extend outside the outer protective cover (41), and the bronchus (52) is in communication with the corresponding temperature change strip (7); The temperature change strip (7) comprises a plurality of temperature-sensitive airbags (71) and a plurality of elastic tubes (72) respectively fixedly connected between two temperature-sensitive airbags (71); the adjacent temperature-sensitive airbags (71) and the elastic tubes (72) are in communication; the uppermost temperature-sensitive airbag (71) is fixedly connected to the top end of the outer protective cover (41); an isolation string is arranged in each of the plurality of elastic tubes (72); the plurality of isolation strings respectively penetrate the upper elastic tubes (72) and the temperature-sensitive airbags (71) and extend into the bronchus (52); and the end of the isolation string located in the bronchus (52) is fixedly connected to the inner wall of the bronchus (52); the isolation string comprises a tube blocking strip (731) having an interference fit with the elastic tube (72) and a drawstring (732) fixedly connected between the upper end of the tube blocking strip (731) and the inner wall of the bronchus (52); and the plurality of drawstrings (732) have different colors.

2. A fire alarm system for a network room according to claim 1, characterized in that: The outer protective cover (41) and the outer sleeve (6) are both transparent structures, and the main air pipe (51) is in a normally closed state.

3. A fire alarm system for a network room according to claim 2, characterized in that: The sensing layers are made of hot-melt material, and the colors of the multiple sensing layers are different. From left to right, the hot-melt temperature gradient of the multiple sensing layers increases, and the lowest hot-melt temperature of the sensing layer is consistent with the highest safe operating temperature of the corresponding equipment.

4. A fire alarm system for a network room according to claim 1, characterized in that: The temperature-sensing airbag (71) and the elastic tube (72) are both elastic sealing structures, and each temperature-sensing airbag (71) is filled with compressed inert gas.

5. The fire alarm system for a network room according to claim 1, characterized in that: It also includes a plurality of front monitoring modules arranged corresponding to the equipment in the machine room, the front monitoring modules including a temperature sensor and a positioning module installed on the corresponding equipment, and the plurality of front monitoring modules also collectively including a foam fire extinguishing module, the foam fire extinguishing module including a plurality of metal storage tanks (1) installed at a plurality of corners of the machine room, two groups of foam nozzles (2) respectively located on the top and the floor of the machine room, a plurality of flow guide pipes connecting the foam nozzles (2) and adjacent metal storage tanks (1), solenoid valves installed on the plurality of flow guide pipes, a foam pump installed on each of the metal storage tanks (1), and the solenoid valves and the foam pumps are both connected to the control center signal.

6. A fire alarm system for a network room according to claim 5, characterized in that: Each group of foam nozzles (2) is provided with a plurality of them, and the plurality of foam nozzles (2) on the top of the machine room are respectively provided corresponding to a plurality of machine room equipment, and the plurality of foam nozzles (2) on the floor of the machine room are respectively located between a plurality of adjacent equipment.

7. A fire alarm system for a network room according to claim 6, characterized in that: The foam spray head (2) comprises a calibrated metal tube (22) connected to the guide tube via an electric rotating shaft, a variable diameter nozzle (21) fixedly connected to the calibrated metal tube (22), and an electric control ring (23) electrically connected to the top of the variable diameter nozzle (21), the electric control ring (23) and the electric rotating shaft are both connected to a control center signal, and the variable diameter nozzle (21) is fixedly inlaid with a plurality of groups of lining strips, each group of the lining strips comprises a side bone rod (31), an active bone rod (32) and two driven bone rods (33), the active bone rod (32) is located between the two driven bone rods (33), and the side bone rod (31) is located on a side of one of the driven bone rods (33) away from the active bone rod (32).

8. A fire alarm system for a network room according to claim 7, characterized in that: The plurality of groups of lining strips all extend to the lower side of the variable diameter nozzle (21); a sizing rope (34) is connected between the plurality of groups of lining strips, and the sizing rope (34) passes through the middle of all the side bone rods (31), the active bone rods (32) and the driven bone rods (33); the side bone rods (31) and the active bone rods (32) are all made of electromagnetic materials; the driven bone rods (33) are made of magnetic materials; and magnetic attraction exists between the driven bone rods (33) and the energized side bone rods (31) and the active bone rods (32).

Images