A concealed fire sprinkler with high sensitivity

Abstract

The application relates to the technical field of fire safety, and discloses a hidden fire sprinkler with high sensitivity, which comprises a group of first installation holes and a plurality of groups of second installation holes arranged in a ceiling, the first installation holes are arranged at the center of a room, and the plurality of groups of second installation holes are arranged above flammable points; a group of hidden fire sprinkler assemblies are arranged in the first installation holes, a thermosensitive discharge assembly is arranged in the second installation holes, and the thermosensitive discharge assembly is connected with the hidden fire sprinkler assemblies through wires; according to the thermoelectric generation principle (Seebeck effect), when a fire source generates temperature change, voltage and current can be quickly generated to trigger system starting, and the response time is shorter than that of a traditional thermosensitive glass plunger; the hidden fire sprinkler with high sensitivity has the core advantages of high sensitivity, hidden installation, accurate fire extinguishing and reusability, and meanwhile, the hidden fire sprinkler with high sensitivity has the advantages of aesthetics and reliability, and is an important technical progress in the field of fire safety.

Description

Technical Field

[0001] This invention relates to the field of fire safety technology, specifically a highly sensitive concealed fire sprinkler head. Background Technology

[0002] With the development of society and the economy and the continuous improvement of people's living standards, fire safety awareness has become deeply rooted in people's hearts and has become an indispensable and important consideration in modern building design. Against this backdrop, the popularity of various fire-fighting equipment continues to rise. Among them, fire sprinklers, due to their advantages of simple structure, convenient installation, and high fire extinguishing efficiency, have become one of the most widely used automatic fire extinguishing devices in various building fire protection systems.

[0003] However, while meeting basic safety needs, contemporary consumers are also increasingly demanding aesthetic improvements in their living and working environments. Especially in high-end commercial complexes, boutique hotels, and luxury residences, traditional sprinkler installation methods often clash with meticulously designed interior décor. When sprinklers are installed protruding from the ceiling or wall, their mechanical appearance not only disrupts the overall aesthetics of the space but may also affect the visual impact of lighting design, ceiling styles, and other decorative elements, thereby reducing the perceived quality and comfort of the environment. Summary of the Invention

[0004] The purpose of this invention is to provide a highly sensitive concealed fire sprinkler head to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A highly sensitive concealed fire sprinkler includes a first set of mounting holes and multiple sets of second mounting holes installed in the ceiling. The first set of mounting holes is located in the center of the room, while the multiple sets of second mounting holes are located above flammable points.

[0007] A set of concealed fire sprinkler assembly is installed in the first mounting hole, and a thermal discharge assembly is installed in the second mounting hole. The thermal discharge assembly is connected to the concealed fire sprinkler assembly via a wire.

[0008] The concealed fire sprinkler assembly includes a fixed cylinder, a positioning insert installed at the bottom of the fixed cylinder, the positioning insert being slidably connected to a first mounting hole, a water tank fixedly connected to the top of the fixed cylinder, a sealing block fixedly connected to the bottom of the water tank, a sliding cylinder slidably connected inside the sealing block, an internally threaded cylinder fixedly connected to the bottom of the sliding cylinder, an installation screw cylinder internally threaded to the internally threaded cylinder, a sealing plate fixedly connected to the bottom of the installation screw cylinder, a water outlet provided inside the sealing plate, a splash plate fixedly connected to the sealing plate below the water outlet, a fixed stop block fixedly connected to the outer wall of the internally threaded cylinder, a piston cylinder fixedly connected to the outer wall of the fixed cylinder, a sliding piston slidably connected inside the piston cylinder, a connecting rod fixedly connected to the sliding piston, a telescopic stop block fixedly connected to the connecting rod, the telescopic stop block and the fixed stop block cooperating with each other, a connector fixedly connected to one side of the water tank, and a second spring installed on the side of the sliding piston near the piston cylinder;

[0009] A sealing plunger is fixedly connected inside the water tank, and the bottom of the sealing plunger cooperates with the water outlet to seal the water outlet.

[0010] A protective tube is fixedly connected to the end of the piston cylinder away from the fixed cylinder. A nickel-titanium alloy memory wire with a diameter of 0.5 mm is installed inside the protective tube. A current limiter is fixedly connected to the protective tube, and the nickel-titanium alloy memory wire is connected to the current limiter.

[0011] The thermistor discharge assembly includes a bismuth telluride thermoelectric block installed in the second mounting hole, and the bismuth telluride thermoelectric block is connected to the current limiter via a wire.

[0012] As a further aspect of the present invention: a sealing ring is installed at the connection between the sealing plunger and the water outlet.

[0013] As a further aspect of the present invention: a first screw seat is fixedly connected to the bottom of the fixed cylinder.

[0014] As a further aspect of the present invention, a protective cover is slidably connected to the bottom of the positioning insert.

[0015] As a further aspect of the present invention: a limiting block is fixedly connected to the inner wall of the water tank, and the limiting block cooperates with the sliding cylinder to limit the sliding cylinder.

[0016] As a further embodiment of the present invention: the fixed stop block is set at an oblique angle on the side near the sealing block, and the other side of the fixed stop block is set at a right angle, and the telescopic stop block is set at a tapered end away from the connecting rod.

[0017] As a further aspect of the present invention: multiple sets of mounting cylinders are fixedly connected to the current limiter, and a first threaded connecting seat is fixedly connected to the mounting cylinder. A conductive contact is fixedly installed inside the first threaded connecting seat, and the conductive contact is connected in parallel to the current limiter through a conductive wire.

[0018] As a further aspect of the present invention: an insulating mounting base is fixedly connected to the bismuth telluride thermoelectric block, a second screw seat is fixedly connected to the insulating mounting base, and a second threaded connector is fixedly connected to the bismuth telluride thermoelectric block through the insulating mounting base. A conductive contact is also fixedly installed inside the second threaded connector.

[0019] As a further aspect of the present invention: threaded terminals are fixedly connected to both ends of the wire, the threaded terminals are threadedly connected to the first threaded connector and the second threaded connector, and conductive contacts are fixedly connected inside the threaded terminals, with the conductive contacts cooperating with each other.

[0020] As a further aspect of the present invention: a baffle is fixedly connected to the bottom of the internally threaded cylinder, and a first spring is installed between the bottom of the baffle and the positioning insert.

[0021] As a further embodiment of the present invention: a water guide groove is provided inside the sealing plunger, an inlet hole communicating with the water tank is provided at the top of the water guide groove, a sealing plug is provided at the bottom of the water guide groove, a fixed seat is fixedly connected to the bottom of the sealing plunger, and a thermosensitive glass plunger is installed between the fixed seat and the sealing plug.

[0022] Compared with the prior art, the beneficial effects of the present invention are: the present invention utilizes the thermoelectric power generation principle (Seebeck effect) to quickly generate voltage and current when the temperature of the fire source changes, triggering the system to start. The response time is shorter than that of the traditional thermistor glass plunger. It does not need to wait for the temperature to be conducted to the nozzle, and directly unlocks the mechanical structure of the nozzle, avoiding the response lag caused by the heat conduction delay of the traditional nozzle.

[0023] Meanwhile, the invention is fully embedded in the ceiling during installation: the nozzle assembly is normally retracted into the ceiling, with only the protective cover exposed (which can be painted with the same color as the wall), which does not affect the aesthetics of the interior decoration. And through the mechanical linkage of the fixed block and the telescopic block, the splash plate will only extend when extinguishing a fire, achieving "seamless" installation.

[0024] Furthermore, this invention employs a distributed thermal discharge component, which is positioned directly above the flammable point. The bismuth telluride thermoelectric block directly senses the local high temperature, avoiding the false triggering of traditional nozzles due to a rise in global temperature, and ensuring that the fire source is covered without any blind spots.

[0025] This invention utilizes the temperature difference of a heat source to generate electricity, requiring no external power source and suitable for power outage environments. Both the nickel-titanium alloy memory wire and the bismuth telluride thermoelectric block are solid-state devices, eliminating the risk of chemical leakage.

[0026] This invention achieves the core advantages of fire sprinklers—high sensitivity, concealed installation, precise fire suppression, and reusability—through an innovative combination of bismuth telluride thermoelectric block thermoelectric power generation and nickel-titanium alloy memory wire drive, while also taking into account aesthetics and reliability. It represents a significant technological advancement in the field of fire safety. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a highly sensitive concealed fire sprinkler head according to the present invention.

[0028] Figure 2 This is a schematic diagram showing the positions of the first mounting hole and the second mounting hole in a highly sensitive concealed fire sprinkler head according to the present invention.

[0029] Figure 3 This is a schematic diagram illustrating the effect of a highly sensitive concealed fire sprinkler head according to the present invention.

[0030] Figure 4 This is a structural diagram illustrating a highly sensitive concealed fire sprinkler head according to the present invention.

[0031] Figure 5 This is a schematic diagram of the structure of a concealed fire sprinkler assembly in a highly sensitive concealed fire sprinkler of the present invention.

[0032] Figure 6 This is a schematic diagram of the thermal discharge component in a highly sensitive concealed fire sprinkler head according to the present invention.

[0033] Figure 7 This is a schematic diagram of the wire structure in a highly sensitive concealed fire sprinkler head according to the present invention.

[0034] Figure 8 This is a schematic diagram of the internal structure of the fixed cylinder in a highly sensitive concealed fire sprinkler head according to the present invention.

[0035] Figure 9 This is a cross-sectional schematic diagram of the fixed cylinder in a highly sensitive concealed fire sprinkler head according to the present invention.

[0036] Figure 10 This is a schematic diagram of the cross-sectional structure of a highly sensitive concealed fire sprinkler head according to the present invention.

[0037] Figure 11 for Figure 10 A magnified view of point A in the middle.

[0038] In the diagram: 1-First mounting hole, 2-Second mounting hole, 3-Fixing cylinder, 4-Positioning insert, 5-First screw seat, 6-Water tank, 7-Sealing block, 8-Sliding cylinder, 9-Limit stop, 10-Internal threaded cylinder, 11-Mounting screw cylinder, 12-Sealing plate, 13-Outlet, 14-Splash plate, 15-Sealing plunger, 16-Sealing ring, 17-Water guide groove, 18-Water inlet, 19-Sealing plug, 20-Fixing seat, 21-Thermosensitive glass plunger, 22-Baffle, 23-First spring, 24-Connector, 25-Fixing stop 26-Piston cylinder, 27-Sliding piston, 28-Connecting rod, 29-Telescopic stop block, 30-Second spring, 31-Protective tube, 32-Ni-titanium alloy memory wire, 33-Current limiter, 34-Mounting cylinder, 35-Conductive wire, 36-First threaded connector, 37-Conductive contact, 38-Bismuth telluride thermoelectric block, 39-Insulating mounting base, 40-Second screw seat, 41-Second threaded connector, 42-Wire, 43-Threaded connector, 44-Protective cover, 45-Concealed fire sprinkler assembly, 46-Thermosensitive discharge assembly. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0040] In one embodiment, see [reference] Figures 1-11 A highly sensitive concealed fire sprinkler head includes a set of first mounting holes 1 and multiple sets of second mounting holes 2 installed in the ceiling. The first mounting holes 1 are located in the center of the room, while the multiple sets of second mounting holes 2 are located above flammable points.

[0041] A set of concealed fire sprinkler assembly 45 is installed in the first mounting hole 1, and a thermal discharge assembly 46 is installed in the second mounting hole 2. The thermal discharge assembly 46 is connected to the concealed fire sprinkler assembly 45 through a wire 42.

[0042] The concealed fire sprinkler assembly 45 includes a fixed cylinder 3, a positioning insert 4 installed at the bottom of the fixed cylinder 3, the positioning insert 4 being slidably connected to the first mounting hole 1, a water tank 6 fixedly connected to the top of the fixed cylinder 3, a sealing block 7 fixedly connected to the bottom of the water tank 6, a sliding cylinder 8 slidably connected inside the sealing block 7, an internally threaded cylinder 10 fixedly connected to the bottom of the sliding cylinder 8, an installation screw cylinder 11 internally threadedly connected to the internally threaded cylinder 10, a sealing plate 12 fixedly connected to the bottom of the installation screw cylinder 11, a water outlet 13 provided inside the sealing plate 12, and a fixed connection to the sealing plate 12 below the water outlet 13. A splash plate 14 has a fixed stop 25 fixedly connected to the outer wall of the internally threaded cylinder 10. A piston cylinder 26 is fixedly connected to the outer wall of the fixed cylinder 3. A sliding piston 27 is slidably connected inside the piston cylinder 26. A connecting rod 28 is fixedly connected to the sliding piston 27. A telescopic stop 29 is fixedly connected to the connecting rod 28. The telescopic stop 29 and the fixed stop 25 cooperate with each other. A connector 24 is fixedly connected to one side of the water tank 6. A second spring 30 is installed on the side of the sliding piston 27 near the piston cylinder 26. The connecting rod 28 and the telescopic stop 29 are made of a highly conductive metal material.

[0043] A sealing plunger 15 is fixedly connected inside the water tank 6. The bottom of the sealing plunger 15 cooperates with the water outlet 13 to seal the water outlet 13.

[0044] A protective tube 31 is fixedly connected to the end of the piston cylinder 26 away from the fixed cylinder 3. A nickel-titanium alloy memory wire 32 with a diameter of 0.5 mm is installed inside the protective tube 31. A current limiter 33 is fixedly connected to the protective tube 31. The nickel-titanium alloy memory wire 32 is connected to the current limiter 33.

[0045] The thermistor discharge assembly 46 includes a bismuth telluride thermoelectric block 38 installed in the second mounting hole 2, and the bismuth telluride thermoelectric block 38 is connected to a current limiter 33 via a wire 42.

[0046] In the process of using this invention, firstly, according to the different locations of flammable materials, a second mounting hole 2 is opened in the ceiling above the flammable material, and at the same time, a first mounting hole 1 is opened at the center of multiple sets of second mounting holes 2. Then, the concealed fire sprinkler assembly 45 can be installed into the first mounting hole 1, and multiple sets of thermal discharge assemblies 46 can be installed into multiple sets of second mounting holes 2. Then, the current limiter 33 and the bismuth telluride thermoelectric block 38 are connected through the wire 42.

[0047] During the installation process, the positioning cylinder 4 is first inserted into the first mounting hole 1 to protect the first mounting hole 1, thereby preventing and fixing the fixed cylinder 3. At this time, the sealing plunger 15 is inserted into the water outlet 13 to seal the water outlet 13. Meanwhile, the fixed stop 25 is located above the telescopic stop 29, thereby limiting the internal thread cylinder 10 by the fixed stop 25 being located at the telescopic stop 29. The internal thread cylinder 10 drives the sealing plate 12 and the splash plate 14 to retract synchronously into the positioning cylinder 4, thereby realizing the hidden design of the sealing plate 12 and the splash plate 14. At this time, one end of the nickel-titanium alloy memory wire 32 is connected to the bismuth telluride thermoelectric block 38 through the wire 42, and the other end is connected to the fire pipeline through the telescopic stop 29 via the connecting rod 28.

[0048] When the flammable material burns, the hot air generated by the combustion rises, which rapidly heats the bottom of the bismuth telluride thermoelectric block 38 above the flammable material. At this time, a temperature difference is generated on both sides of the bismuth telluride thermoelectric block 38. The direction of charge movement is consistent with the direction of heat transfer, that is, from the high temperature end to the low temperature end. The charge in the bismuth telluride thermoelectric block 38 gathers towards the lower temperature end, thus forming a negative electrode. At this time, the fire-fighting pipe is connected to the ground and can be regarded as a positive electrode, thus forming a circuit at both ends of the nickel-titanium alloy memory wire 32.

[0049] The experiment shows that, under a temperature difference of 50°C and an area of ​​10 cm², the typical output of the bismuth telluride thermoelectric module is:

[0050] Open circuit voltage: approximately 2.5V;

[0051] Maximum current: approximately 1.2A for short circuit or 0.6A for matched load;

[0052] The current generated at this time enters the current limiter 33 through the wire 42, and then the current limiter 33 limits the current input to the wire 42. When the current in the wire 42 is too large, that is, when the temperature of the bismuth telluride thermoelectric block 38 changes rapidly, it can be determined that the flammable material below the bismuth telluride thermoelectric block 38 has burned. At this time, the charge passes through the current limiter 33 and enters the nickel-titanium alloy memory wire 32. At this time, the nickel-titanium alloy memory wire 32 is energized and contracts, generating a tension of 20-30N. At this time, the tension acts on the connecting rod 28, thereby driving the telescopic stop 29 to move away from the fixed stop 25 and compressing the second spring 30.

[0053] At this time, the fixed stop 25 loses its limit, and the pressure generated by the water pressure acts on the sealing plate 12. The sealing plate 12 drives the mounting screw cylinder 11, the internal threaded cylinder 10 and the sliding cylinder 8 to slide out of the water tank 6 and extend out of the fixed cylinder 3. As the sealing plate 12 extends downward, the sealing plunger 15 is pulled out from the water outlet 13, and the water outlet 13 opens. At this time, the high-pressure water flows out from the water outlet 13 and impacts the splash plate 14. The water flow drips in an umbrella shape under the action of the splash plate 14, thereby extinguishing the fire source.

[0054] In one instance of this embodiment, please refer to Figures 5-11 The bottom of the internal threaded cylinder 10 is fixedly connected to a baffle 22. A first spring 23 is installed between the bottom of the baffle 22 and the positioning insert 4. The present invention uses the first spring 23 to elastically lift the baffle 22. Then, when the water pressure impact drives the internal threaded cylinder 10 to extend, the internal threaded cylinder 10 drives the baffle 22 to press down synchronously, thereby compressing the first spring 23.

[0055] After the fire is extinguished, the temperature at the ignition point decreases. At this time, the temperature difference between the two sides of the bismuth telluride thermoelectric block 38 decreases, and no current is generated. After the nickel-titanium alloy memory wire 32 drives the wire to cool down, it returns to its original length. At this time, the second spring 30 loses its compressive force, thereby releasing elastic potential energy, which in turn pushes the telescopic stop block 29 to reset. Furthermore, after the fire is extinguished and the fire pipeline is temporarily closed, the water pressure in the fire pipeline disappears, and the sealing plate 12 loses its thrust. At this time, the first spring 23 releases elastic potential energy, which in turn pushes the internal threaded cylinder 10 to rise and reset. This enables the equipment to be used multiple times.

[0056] In one instance of this embodiment, please refer to Figures 5-11 The fixed stop 25 is set at an angle on the side near the sealing block 7, and the other side of the fixed stop 25 is set at a right angle. The telescopic stop 29 is set at a tapered end away from the connecting rod 28.

[0057] When the device is in the off state, the fixed stop 25 is located at the bottom of the telescopic stop 29. At this time, the right-angled surface of the fixed stop 25 is in contact with the telescopic stop 29, and the two sets of right-angled surfaces are in contact with each other, thereby achieving the limiting and locking between the fixed stop 25 and the telescopic stop 29. After the fire is extinguished, the fixed stop 25 is located below the telescopic stop 29. At this time, the conical surface of the telescopic stop 29 is in contact with the oblique surface of the fixed stop 25, thereby converting the elastic potential energy of the first spring 23 into a horizontal driving force acting on the telescopic stop 29, thereby driving the telescopic stop 29 to retract and reset, and then causing the fixed stop 25 to pass over the telescopic stop 29 so that the two sets of right-angled surfaces are in contact with each other again, thereby completing the automatic reset of the device.

[0058] In one instance of this embodiment, please refer to Figures 5-11A sealing ring 16 is installed at the connection between the sealing plunger 15 and the outlet 13. The present invention seals the outlet 13 and the sealing plunger 15 by setting the sealing ring 16, thereby avoiding water leakage due to long-term use.

[0059] In one instance of this embodiment, please refer to Figures 5-11 The bottom of the fixed cylinder 3 is fixedly connected to a first screw seat 5. The present invention uses the first screw seat 5 to fix the fixed cylinder 3 into the first mounting hole 1.

[0060] In one instance of this embodiment, please refer to Figures 5-11 The bottom of the positioning insert 4 is slidably connected to a protective cover 44. The present invention covers the first mounting hole 1 by setting the protective cover 44. In addition, during the decoration process, the bottom of the protective cover 44 can be painted with wall paint that matches the interior wall, thereby avoiding visual patches caused by color difference.

[0061] In one instance of this embodiment, please refer to Figures 5-11 A limiting block 9 is fixedly connected to the inner wall of the water tank 6. The limiting block 9 cooperates with the sliding cylinder 8 to limit the sliding cylinder 8. The present invention limits the top of the sliding cylinder 8 by cooperating with the limiting block 9 and the sliding cylinder 8, thereby limiting the shortest retraction distance between the sliding cylinder 8 and the water tank 6, thus preventing the sliding cylinder 8 from retracting to the top of the water tank 6 and affecting the normal use of the equipment.

[0062] In one instance of this embodiment, please refer to Figures 5-11 The current limiter 33 is fixedly connected to multiple sets of mounting cylinders 34. A first threaded connector 36 is fixedly connected to the mounting cylinder 34. A conductive contact 37 is fixedly installed inside the first threaded connector 36. The conductive contact 37 is connected in parallel to the current limiter 33 through a conductive wire 35. An insulating mounting base 39 is fixedly connected to the bismuth telluride thermoelectric block 38. A second screw seat 40 is fixedly connected to the insulating mounting base 39. The bismuth telluride thermoelectric block 38 passes through the insulating mounting base 39 and is fixedly connected to a second threaded connector 41. A conductive contact 37 is also fixedly installed inside the second threaded connector 41. Threaded terminals 43 are fixedly connected to both ends of the wire 42. The threaded terminals 43 are threadedly connected to the first threaded connector 36 and the second threaded connector 41. A conductive contact 37 is fixedly connected inside the threaded terminal 43. The conductive contacts 37 cooperate with each other.

[0063] The present invention first fixes the insulating mounting base 39 and the bismuth telluride thermoelectric block 38 to the second mounting hole 2 by passing a screw through the second screw seat 40. Then, the wire 42 is stably connected by threaded connection of the threaded terminal 43 to the first threaded connection seat 36 and the second threaded connection seat 41. After the wire 42 is connected, the current limiter 33 and the bismuth telluride thermoelectric block 38 are connected by the mutual cooperation of the conductive contacts 37.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A highly sensitive concealed fire sprinkler head, comprising a set of first mounting holes and multiple sets of second mounting holes disposed within a suspended ceiling, characterized in that, The first mounting hole is located in the center of the room, while multiple sets of second mounting holes are located above the flammable point. A set of concealed fire sprinkler assembly is installed in the first mounting hole, and a thermal discharge assembly is installed in the second mounting hole. The thermal discharge assembly is connected to the concealed fire sprinkler assembly via a wire. The concealed fire sprinkler assembly includes a fixed cylinder, a positioning insert installed at the bottom of the fixed cylinder, the positioning insert being slidably connected to a first mounting hole, a water tank fixedly connected to the top of the fixed cylinder, a sealing block fixedly connected to the bottom of the water tank, a sliding cylinder slidably connected inside the sealing block, an internally threaded cylinder fixedly connected to the bottom of the sliding cylinder, an installation screw cylinder internally threaded to the internally threaded cylinder, a sealing plate fixedly connected to the bottom of the installation screw cylinder, a water outlet provided inside the sealing plate, a splash plate fixedly connected to the sealing plate below the water outlet, a fixed stop block fixedly connected to the outer wall of the internally threaded cylinder, a piston cylinder fixedly connected to the outer wall of the fixed cylinder, a sliding piston slidably connected inside the piston cylinder, a connecting rod fixedly connected to the sliding piston, a telescopic stop block fixedly connected to the connecting rod, the telescopic stop block and the fixed stop block cooperating with each other, a connector fixedly connected to one side of the water tank, and a second spring installed on the side of the sliding piston near the piston cylinder; A sealing plunger is fixedly connected inside the water tank, and the bottom of the sealing plunger cooperates with the water outlet to seal the water outlet. A protective tube is fixedly connected to the end of the piston cylinder away from the fixed cylinder. A nickel-titanium alloy memory wire with a diameter of 0.5 mm is installed inside the protective tube. A current limiter is fixedly connected to the protective tube, and the nickel-titanium alloy memory wire is connected to the current limiter. The thermistor discharge assembly includes a bismuth telluride thermoelectric block installed in the second mounting hole, and the bismuth telluride thermoelectric block is connected to the current limiter through a wire; The fixed stop is set at an angle on the side near the sealing block, and at a right angle on the other side. The telescopic stop is set at a tapered end away from the connecting rod. The sealing plunger is provided with a water guide groove, the top of the water guide groove is provided with a water inlet hole that communicates with the water tank, the bottom of the water guide groove is provided with a sealing plug, the bottom of the sealing plunger is fixedly connected to a fixing seat, and a thermosensitive glass plunger is installed between the fixing seat and the sealing plug.

2. The highly sensitive concealed fire sprinkler head according to claim 1, characterized in that, The bottom of the fixed cylinder is fixedly connected to a first screw seat.

3. The highly sensitive concealed fire sprinkler head according to claim 1, characterized in that, A limit block is fixedly connected to the inner wall of the water tank. The limit block cooperates with the sliding cylinder to limit the movement of the sliding cylinder.

4. The highly sensitive concealed fire sprinkler head according to claim 1, characterized in that, Multiple sets of mounting cylinders are fixedly connected to the current limiter. A first threaded connector is fixedly connected to the mounting cylinder. A conductive contact is fixedly installed inside the first threaded connector. The conductive contact is connected in parallel to the current limiter through a conductive wire.

5. A highly sensitive concealed fire sprinkler head according to claim 4, characterized in that, An insulating mounting base is fixedly connected to the bismuth telluride thermoelectric block, and a second screw seat is fixedly connected to the insulating mounting base. The bismuth telluride thermoelectric block passes through the insulating mounting base and is fixedly connected to a second threaded connector. A conductive contact is also fixedly installed inside the second threaded connector.

6. A highly sensitive concealed fire sprinkler head according to claim 5, characterized in that, The wire is fixedly connected to threaded terminals at both ends. The threaded terminals are threadedly connected to the first threaded connector and the second threaded connector. Conductive contacts are fixedly connected inside the threaded terminals, and the conductive contacts cooperate with each other.

7. A highly sensitive concealed fire sprinkler head according to claim 1, characterized in that, A baffle is fixedly connected to the bottom of the internally threaded cylinder, and a first spring is installed between the bottom of the baffle and the positioning insert.

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