Multi-mode fire detection and linkage dry powder extinguishing device for curing barn

Abstract

The utility model discloses a multi-mode fire detection and linkage dry powder extinguishing device for a curing barn, which is characterized in that a multispectral detection array consists of three groups of ultraviolet flame sensors, four groups of dual-band infrared detectors and two thermal imagers; the grading alarm module comprises an audible and visual alarm, an exhaust cut-off device and a dry powder injection valve; the output ends of the ultraviolet flame sensor and the dual-band infrared detector are connected in parallel to the audible and visual alarm to form a primary response unit; the thermal imager and the dry powder injection valve are connected through an RS trigger to form a secondary response unit; and the multispectral detection array, the grading alarm module and the superfine dry powder pipe network are in communication connection through a control bus. According to the scheme, through the structural design of the multispectral detection array and the dual-redundancy control bus and in combination with the pressure maintaining structure of the pneumatic energy accumulator, the technical problems that a traditional fire prevention and control system is high in false alarm rate, insufficient in communication reliability and unstable in fire extinguishing agent release pressure after power failure are solved.

Description

Technical Field

[0001] This utility model relates to the field of fire protection equipment technology, and in particular to a multimodal fire detection and linkage dry powder fire extinguishing device for drying rooms. Background Technology

[0002] In high-temperature, enclosed environments such as automotive paint booths and industrial drying rooms, fire hazards remain a significant safety threat. Existing technologies have the following shortcomings:

[0003] (1) Insufficient detection accuracy: Conventional flame detectors mostly use single-spectrum detection, which is easily affected by the reflection of high-temperature metals, resulting in a false alarm rate as high as 18%-25% (test data of GB / T 9978.1-2008). While thermal imagers can identify temperature anomalies, they cannot distinguish between flames and local high-temperature equipment, resulting in a delayed response.

[0004] (2) Low fire extinguishing efficiency: Traditional dry powder fire extinguishing systems use dry powder with D50 > 20μm, which has low diffusion efficiency in the turbulent environment of the drying room. The ratio of the extinguishing agent settling velocity to the flame spread velocity is only 1:1.2, which cannot achieve "early extinguishing and small fires" (GA1167-2014 standard).

[0005] (3) Lack of system reliability: The single-bus control architecture (such as RS485 bus) is susceptible to electromagnetic interference, and the system will be paralyzed when the bus fails; the power redundancy design is insufficient, and the fire extinguishing function will fail after the mains power is interrupted (GB50116-2013 requires continuous power supply for ≥30 minutes).

[0006] (4) Lack of linkage control: 78% of drying room fires are caused by failure to shut off the exhaust system in time, which leads to the spread of the fire. Existing technology lacks deep linkage with drying room equipment (GB3836.1-2010 explosion-proof standard). Utility Model Content

[0007] The technical objective of this invention is to provide a multimodal fire detection and linkage dry powder fire extinguishing device. Through the structural design of a multispectral detection array and a dual-redundant control bus, combined with the pressure maintenance structure of a pneumatic accumulator, it solves the technical problems of high false alarm rate, insufficient communication reliability, and unstable release pressure of extinguishing agent after power failure in traditional fire prevention and control systems.

[0008] The technical solution adopted by this utility model to solve its technical problem is:

[0009] A multimodal fire detection and linkage dry powder fire extinguishing device for drying rooms, characterized in that it comprises:

[0010] The multispectral detection array consists of three sets of ultraviolet flame sensors, four sets of dual-band infrared detectors, and two thermal imagers, and these three types of detectors are installed in a spatial grid layout.

[0011] The graded alarm module includes an audible and visual alarm, an exhaust shut-off device, and a dry powder injection valve. The output terminals of the ultraviolet flame sensor and the dual-band infrared detector are connected in parallel to the audible and visual alarm to form a primary response unit. The ultraviolet flame sensor and the dual-band infrared detector are connected in parallel to the exhaust shut-off device, and the exhaust shut-off device is triggered when any two of the ultraviolet flame sensors or the dual-band infrared detector output a high-level signal. The thermal imager and the dry powder injection valve are connected through an RS trigger to form a secondary response unit, and the injection is triggered when the temperature gradient is >15℃ / s.

[0012] An ultra-fine dry powder pipeline is directly connected to the dry powder injection valve;

[0013] The multispectral detection array, the graded alarm module, and the ultrafine dry powder pipeline are connected via a control bus.

[0014] Further optimization of the technical solution involves a dual-redundant control bus, comprising a master CAN bus and an RS485 bus for parallel communication.

[0015] In a further optimized technical solution, the redundant control bus is configured with a bus status monitoring function to assess bus reliability according to communication standard requirements (such as ISO 11898-2).

[0016] Further optimization of the technical solution involves connecting the dual redundant control bus to a ring grounding network, which is formed by welding 40×4mm galvanized flat steel to create a closed loop, with a combined grounding resistance ≤0.5Ω and a node spacing ≤5m.

[0017] Further optimizing the technical solution, the nozzle of the ultrafine dry powder pipeline includes: a ceramic filter screen and a dust-proof guide hood; the bottom of the dust-proof guide hood is provided with a guide groove that engages with the edge of the filter screen; the pore size of the ceramic filter screen is 0.2μm, the surface roughness Ra of the dust-proof guide hood is ≤0.8μm, and the tilt angle of the dust-proof guide hood is 45°±5°.

[0018] Further optimized technical solutions also include a compressed air backflushing system. The compressed air backflushing system is mechanically linked to the ceramic filter screen of the dry powder injection valve through a three-way valve. Its compressed air pipeline is directly connected to the nozzle cavity of the ultra-fine dry powder pipeline. When the dry powder injection valve is activated, the compressed air backflushing system is automatically activated to remove dust accumulated on the filter screen.

[0019] Further optimizing the technical solution, the graded alarm module includes a band-stop filter circuit with a cutoff frequency of 800-1200Hz, which is composed of an LC parallel resonant circuit. The input end is connected to a microphone, and the output end is connected to the signal processing unit of the audible and visual alarm.

[0020] Further optimized technical solutions also include an emergency mechanical starting device, which comprises an explosion-proof manual button with an IP68 protection rating and a pneumatic accumulator; the explosion-proof manual button is linked to the control valve of the dry powder injection valve via a hard wire; the pneumatic accumulator is connected to the ultrafine dry powder pipeline network via a high-pressure pipeline; the pneumatic accumulator comprises a pressure-holding spring and a piston structure, the piston structure maintaining the pipeline network pressure through the spring preload after power failure.

[0021] Further optimization of the technical solution ensures that the pneumatic accumulator maintains a pipeline pressure ≥3.75MPa.

[0022] Further optimization of the technical solution involves a modular quick-connect design between the multispectral detection array, the graded alarm module, and the ultrafine dry powder pipeline, and the configuration of an M12 waterproof connector.

[0023] Further optimized technical solutions include an ultraviolet flame sensor with a response wavelength of 180-260nm; a dual-band infrared detector that simultaneously responds to two specific infrared wavelengths of 4.3μm and 5.0μm; and a thermal imager with a resolution of 640×480@30Hz.

[0024] Further optimizing the technical solution, the extinguishing agent filled in the ultrafine dry powder pipeline is ABC type ultrafine dry powder with a filling density of 0.8 g / cm³. 3 Particle size D50≤20μm.

[0025] Further optimizing the technical solution, the ultrafine dry powder pipeline network uses ultrafine dry powder with D50≤5μm to be transported through a pre-embedded stainless steel pipeline network, and the nozzles are arranged in a 120° wide-angle matrix with a density of ≥2 nozzles / m. 2 The injection pressure is 2.5 MPa ± 0.2.

[0026] Further optimization of the technical solution involves installing the three types of detectors in a spatial grid layout on the top and side walls of the drying chamber, with a grid spacing of ≤1.5m and a coverage angle of ≥270°.

[0027] The beneficial effects of this utility model are:

[0028] 1. The three-dimensional layout of the multispectral detection array significantly improves anti-interference capability.

[0029] The ultraviolet flame sensor (response wavelength 180-260nm) and the dual-band infrared detector (4.3μm / 5.0μm dual wavelength) adopt a spatial gridded cross layout, which increases the physical coverage density to twice that of traditional single-point detection.

[0030] The thermal imager (640×480 resolution @ 30Hz) is connected to the ultraviolet / infrared sensor via a hard wire with an M12 waterproof connector to form an independent signal channel and avoid crosstalk between bus signals.

[0031] By complementing the physical layout of multispectral sensors, the flame spectrum can be effectively distinguished from the reflection of high-temperature metals (such as the inner wall of a drying oven), reducing the false alarm rate from 25% for traditional single-spectral detection to 0.5% (measured data from GB / T 9978.1-2008).

[0032] 2. The ultra-fine dry powder pipeline structure achieves efficient diffusion and anti-clogging.

[0033] Nozzle matrix: 120° wide-angle nozzles at a density of ≥2 per m 2 The physical arrangement covers the baking room space. The nozzles are embedded with ceramic filters (pore size 0.2μm) and dust-proof guide covers (surface roughness Ra≤0.8μm, tilt angle 45°±5°), which are fixed by a snap-fit ​​structure.

[0034] Compressed air backflush system: The compressed air pipeline is directly connected to the nozzle cavity through a three-way valve mechanically linked to the ceramic filter, eliminating the need for electronic control.

[0035] The ultrafine dry powder (D50≤5μm) diffuses at a rate of 2.8m / s under a pressure of 2.5MPa, increasing the extinguishing agent utilization rate to 92% (compared to only 68% for traditional technologies) and reducing nozzle clogging rate by 97% (GA1167-2014 certification).

[0036] 3. Enhanced reliability through dual-redundant bus and emergency mechanical structure

[0037] Dual-redundant control bus: The main control CAN bus and RS485 bus are physically parallel wired, and the bus status monitoring module is connected to the ring grounding network (40×4mm galvanized flat steel, node spacing ≤5m) through hard wire.

[0038] Emergency mechanical start device: Explosion-proof manual button (IP68 protection) is directly connected to the dry powder injection valve via a hard wire. The spring-piston structure of the pneumatic accumulator maintains the pipeline pressure ≥3.75MPa after power failure.

[0039] The bus failure rate was reduced from 1.2 times / year for a single-bus architecture to 0.05 times / year, and the fire suppression system can continue to operate for ≥30 minutes after a mains power outage (as required by GB50116-2013).

[0040] 4. Hard-wired direct connection and physical triggering mechanism of the graded alarm module

[0041] First-level response circuit: The output terminals of the ultraviolet / infrared sensors are connected in parallel and then directly drive the sound and light alarm through an LC band-stop filter (cutoff frequency 800-1200Hz), without any software processing.

[0042] Exhaust shut-off trigger: Any two sensor signals trigger the exhaust shut-off device through a physical AND gate circuit, with a response delay of ≤0.5s.

[0043] The ventilation system's linkage response speed is increased by 3 times, avoiding 78% of fire spread problems caused by failure to shut off ventilation in time (GB3836.1-2010 explosion-proof standard data).

[0044] 5. Modular quick-connect design improves maintenance efficiency.

[0045] M12 Waterproof Connector: The detector and the pipeline network use a quick-connect interface, and the ceramic filter and the flow guide are fixed by edge snap-fit, requiring no tools for disassembly.

[0046] Independent unit structure: Each nozzle and sensor is an independent module, supporting single-point replacement.

[0047] The replacement time for a single detector is ≤3 minutes (compared to 30 minutes for traditional technology), reducing maintenance costs by 37%. Attached Figure Description

[0048] Figure 1 This is a block diagram showing the inter-control relationship between the modules of this utility model. Detailed Implementation

[0049] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0050] Combination Figure 1 As shown in the figure, the multimodal fire detection and linkage dry powder fire extinguishing device for drying rooms disclosed in this embodiment has the following specific structure:

[0051] Multispectral detection array: It consists of 3 sets of ultraviolet flame sensors (response wavelength 180-260nm), 4 sets of dual-band infrared detectors (simultaneously detect 4.3μm and 5.0μm wavelengths) and 2 thermal imagers (resolution 640×480@30Hz). The three types of detectors are installed on the top and side walls of the drying room in a spatial grid layout, with a grid spacing ≤1.5m and a coverage angle ≥270°.

[0052] Among them, the ultraviolet sensor and the dual-band infrared detector adopt frequency division multiplexing technology, and suppress high-frequency electromagnetic interference through a band-stop filter (cutoff frequency 800-1200Hz) to ensure signal stability.

[0053] The graded alarm module includes a hard-wired audible and visual alarm, an exhaust shut-off device, and a dry powder injection valve. The outputs of the ultraviolet flame sensor and the dual-band infrared detector are connected in parallel to the audible and visual alarm to form a primary response unit. The exhaust shut-off device is triggered when any two detectors output a high-level signal (response delay ≤0.5s). The thermal imager has a built-in temperature gradient detection module (accuracy ±0.5℃). When the temperature gradient >15℃ / s, the dry powder injection valve is driven via an RS trigger, forming a secondary response unit.

[0054] Ultra-fine dry powder pipeline: Uses ultra-fine dry powder with D50≤5μm (compliant with GA1167-2014 standard), delivered via pre-embedded 316L stainless steel pipeline. Nozzles are arranged in a 120° wide-angle matrix, with a density ≥2 nozzles / m². 2 The spray pressure is 2.5 MPa ± 0.2 MPa. The nozzle integrates a ceramic filter (0.2 μm pore size) and a dust-proof guide shield (surface roughness Ra ≤ 0.8 μm, tilt angle 45° ± 5°), and is linked with the compressed air backflushing system to achieve a self-cleaning function. The extinguishing agent is ABC type ultrafine dry powder (particle size D50 ≤ 20 μm), with a filling density of 0.8 g / cm³. 3 Within 30 seconds of release, the coverage radius is ≥5m.

[0055] Dual-redundant control bus: Parallel communication is achieved using a main control CAN bus and an RS485 bus, with a bus status monitoring module (based on ISO 11898-2 protocol) configured to evaluate communication reliability in real time (packet loss rate ≤0.01%). The ring grounding grid is constructed from 40×4mm galvanized flat steel, with a node spacing ≤5m and a combined grounding resistance ≤0.5Ω.

[0056] The main control CAN bus and RS485 bus are powered independently, with a switching time of ≤50ms, and the bus status data is refreshed every 100ms.

[0057] Emergency mechanical starting device: includes an IP68 explosion-proof manual button and a pneumatic accumulator. The explosion-proof manual button is linked to the control valve of the dry powder injection valve via a hard wire. The pneumatic accumulator is connected to the ultra-fine dry powder pipeline network via a high-pressure pipeline. The pneumatic accumulator includes a pressure holding spring and a piston structure. After power failure, the piston structure maintains the pipeline network pressure through the spring preload.

[0058] The pneumatic accumulator maintains a pressure of ≥3.75MPa (1.5 times the design pressure of 2.5MPa) through spring preload, and continues to supply energy for 30 minutes after power failure.

[0059] The work process is as follows:

[0060] (1) Fire detection stage

[0061] The ultraviolet / infrared detector monitors the characteristic spectrum of the flame in real time. When two or more sensors are triggered simultaneously, the first-level response circuit activates the audible and visual alarm and cuts off the exhaust system.

[0062] The thermal imager simultaneously analyzes the temperature field distribution. If a temperature gradient > 15℃ / s is detected, a pulse signal is sent to the RS trigger.

[0063] (2) Extinguishing agent release stage

[0064] The RS trigger outputs a high-level signal to drive the dry powder injection valve. The ultrafine dry powder is sprayed out through the pre-buried pipeline at a pressure of 2.5MPa. The nozzle guide shroud ensures that the dry powder coverage area is ≥95%.

[0065] The compressed air backflushing system automatically starts after injection (interval ≤ 5s) to remove dust from the filter screen.

[0066] (3) Redundancy control guarantee

[0067] The dual-bus system monitors the communication status in real time. If the main CAN bus fails, the RS485 bus will take over control within 50ms to ensure uninterrupted command transmission.

[0068] When the mains power is interrupted, the pneumatic accumulator maintains the pipeline pressure at ≥3.75MPa, supporting emergency injection for 30 minutes.

[0069] Comparison of key technical indicators in experiments:

[0070]

[0071] Experimental data description:

[0072] The reduction in false alarm rate is due to the multispectral fusion algorithm (weighted confidence ≥ 95%) and the noise suppression of the band-stop filter.

[0073] The improved dry powder diffusion efficiency is due to the synergistic effect of ultra-fine particle size (D50≤5μm) and the design of the flow guide, with the extinguishing agent utilization rate reaching 92%.

[0074] The ring grounding grid reduces the malfunction rate caused by electromagnetic interference to below 0.01% through multi-point equipotential bonding.

[0075] It should be noted that, in this document, terms such as "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0076] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A multi-modal fire detection and linked dry chemical fire extinguishing apparatus for a curing barn, characterized in that, The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network. The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network. The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network. The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network. The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network.

2. A multi-modal fire detection and linked dry chemical fire extinguishing apparatus for a curing barn as defined in claim 1, wherein, The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network.

3. A multi-modal fire detection and linked dry chemical fire extinguishing apparatus for a curing barn as defined in claim 1, wherein, The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network.

4. A multi-modal fire detection and linked dry chemical fire extinguishing apparatus for a curing barn as defined in claim 3, wherein, The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network.

5. A multi-modal fire detection and linked dry chemical fire extinguishing apparatus for a curing barn as defined in claim 1, wherein, The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network.

6. A multi-modal fire detection and linked dry chemical fire extinguishing apparatus for a curing barn as defined in claim 1, wherein, The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network.

7. A multi-modal fire detection and linked dry chemical fire extinguishing apparatus for a curing barn as defined in claim 1, wherein, The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network.

8. A multi-modal fire detection and linked dry chemical fire extinguishing apparatus for a curing barn as defined in claim 1, wherein, The superfine dry powder pipe network adopts superfine dry powder with D50≤5μm to be transported through pre-embedded stainless steel pipe network, the spray head is arranged according to 120° wide-angle matrix and the density is ≥2 / m 2 , and the spray pressure is 2.5MPa±0.

2.

9. A multi-modal fire detection and linked dry chemical fire extinguishing apparatus for a curing barn as defined in claim 8 wherein, The fire extinguishing agent filled in the ultra-fine dry powder pipe network is ABC type ultra-fine dry powder, the filling density is 0.8 g / cm 3 , and the particle size D50 is less than or equal to 20 μm.

10. A multi-modal fire detection and linked dry chemical fire extinguishing apparatus for a curing barn as defined in claim 1, wherein, The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network. The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network. The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network. The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network. The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network. The application relates to a multi-spectrum detection array, a hierarchical alarm module and an ultra-fine dry powder pipe network. 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