A fog-resistant anti-interference fire alarm device for a wind turbine generator system

Abstract

The utility model discloses a kind of fog-proof anti-interference fire alarm devices for wind generating set, belong to wind power fire alarm equipment field, solve the problem that existing alarm high-humidity condensation environment is easy to misreport, cabin strong electromagnetic environment signal distortion, alarm reliability is poor.This utility model includes the alarm body installed in the fan cabin, including support base, shielding protective cover, shielding protective cover inside forms response chamber;Response chamber is equipped with the circuit board of main control module, smoke detector, alarm with, also layout is prevented by condensation sensor, humidity sensor and is composed of fog misreport detection component;Main control module gathers smoke, condensation, humidity signal and passes through preset threshold joint verification, exports alarm instruction.The utility model relies on double sensor to distinguish water vapor and smoke, global electromagnetic shielding is collocated with double filter circuit, realize cabin damp, strong electromagnetic working condition under low misreport, stable and reliable fire early warning, compact structure, adapt to various wind generating set cabin installation.

Description

Technical Field

[0001] This utility model relates to the technical field of alarm equipment for wind turbine generator sets, specifically to a fire alarm device for wind turbine generator sets that is resistant to fog and interference. Background Technology

[0002] This section introduces background technology that may be related to various aspects of the embodiments of this utility model, which is believed to provide useful background information to help readers better understand the various aspects of the embodiments of this utility model. Therefore, it is understood that the description in this section is for the above purposes and does not constitute an admission of the prior art.

[0003] In today's booming green energy landscape, wind power, as a crucial component of clean energy, is experiencing a continuous increase in installed capacity and a gradual extension of its service life. A wind turbine is a device that converts wind energy into electrical energy, primarily composed of blades, a generator, mechanical components, and electrical components. It utilizes wind power to drive the turbine blades to rotate, and a speed increaser further accelerates the rotation to power the generator. However, with the long-term operation of wind turbines, the risk of fire has become increasingly prominent, especially in recent years, with frequent fire accidents posing a significant safety challenge that people must confront.

[0004] Smoke detectors are core equipment in automatic fire suppression systems for wind turbine generators, primarily providing fire warnings by detecting ambient smoke concentration. Currently, conventional smoke detectors on the market have simple structures, relying solely on smoke concentration as a parameter to determine fire hazard, resulting in significant environmental adaptability deficiencies. Firstly, in foggy, rainy, or humid environments, large amounts of suspended water vapor in the air and condensation on equipment surfaces can enter the detector's detection area. Water vapor particles and smoke particles have similar optical characteristics, making them easily misidentified as fire smoke by the detector, leading to frequent false alarms. This not only wastes firefighting resources but also reduces user trust in the alarm system, and prolonged false alarms can lead to the safety hazard of manually blocking alarms. Secondly, the wind turbine generator environment contains significant electromagnetic radiation, electrostatic interference, and high-frequency power supply noise. Conventional smoke detectors lack dedicated electromagnetic interference protection structures, making their internal detection circuits and signal transmission lines susceptible to electromagnetic interference. This can cause data drift, signal distortion, and program malfunctions, leading to missed or false alarms and severely impacting the reliability of fire warnings. Existing smoke detectors suffer from drawbacks such as high false alarm rates in foggy and humid environments, weak anti-interference capabilities in complex electromagnetic environments, and poor detection stability, making them unsuitable for complex working conditions. Summary of the Invention

[0005] The technical problem to be solved is how to provide a fire alarm device for wind turbine generators that is resistant to fog and interference.

[0006] The purpose of this invention is to overcome the defects in the existing technology and provide a fire alarm device for wind turbine generator sets that is resistant to fog and interference, thus solving the problem of poor reliability of existing wind turbine smoke detectors.

[0007] This utility model embodiment provides a fog-proof and interference-resistant fire alarm device for wind turbine generator sets, including: The alarm device body is installed inside the nacelle of the wind turbine generator set. The alarm device body includes a support base, and an anti-electromagnetic interference shield is provided on the support base. An induction chamber is formed inside the shield. A circuit board fixed on the support base is disposed in the sensing chamber; The alarm device body also includes a main control module, an alarm, and a smoke detector that are communicated and connected via the circuit board. The smoke detector senses ambient smoke signals in real time and transmits them to the main control module. The alarm device body also includes a fog false alarm detection component disposed in the sensing chamber. The fog false alarm detection component includes a condensation sensor and a humidity sensor. The condensation sensor and the humidity sensor are respectively communicatively connected to the main control module. The condensation sensor collects environmental condensation signals in real time and transmits them to the main control module. The humidity sensor collects environmental air humidity signals in real time and transmits them to the main control module. The main control module receives the smoke signal, the condensation signal, and the air humidity signal, and generates an alarm control command based on a preset judgment threshold. The command is then transmitted to the alarm device, which executes the alarm control command and issues an alarm signal.

[0008] In some other embodiments of the anti-fog and anti-interference fire alarm device described in this specification, a breathable protective grille is provided inside the shielding protective cover, and a receiving chamber is provided inside the breathable protective grille, with the smoke detector disposed inside the receiving chamber.

[0009] In some other embodiments of the anti-fog and anti-interference fire alarm device described in this specification, the humidity sensor is fixedly mounted on the outside of the breathable protective grille, the condensation sensor is attached and fixedly mounted on the outside of the breathable protective grille, and the detection ends of the condensation sensor and the humidity sensor are both positioned facing the breathable protective grille.

[0010] In some other embodiments of the anti-fog and anti-interference fire alarm device described in this specification, the top of the breathable protective grille is provided with a flexible metal shielding film that is connected to the grounding terminal provided on the circuit board.

[0011] In some other embodiments of the anti-fog and anti-interference fire alarm device described in this specification, a power supply circuit is also included. The power supply circuit includes a DC power filter circuit that suppresses electromagnetic interference on the DC power line and filters out high-frequency noise from the power supply, and a voltage regulator filter circuit that filters the output voltage and outputs the DC power supply. The DC power supply filter circuit and the voltage regulator filter circuit are connected in series.

[0012] In some other embodiments of the anti-fog and anti-interference fire alarm device described in this specification, the shielding cover is an integrated Faraday cage, which is electrically connected to the grounding terminal on the circuit board. The grounding terminal is used to connect external wires to achieve static discharge.

[0013] In some other embodiments of the anti-fog and anti-interference fire alarm device described in this specification, the Faraday cage is a copper-nickel alloy perforated mesh.

[0014] In some other embodiments of the anti-fog and anti-interference fire alarm device described in this specification, the mesh size of the perforated mesh is 0.8 mm.

[0015] In some other embodiments of the anti-fog and anti-interference fire alarm device described in this specification, the shielding cover has a condensation sensor clearance hole and a humidity sensor detection clearance hole for the sensing gas to pass through.

[0016] As can be seen from the above technical solution, in response to the deficiencies in the existing technology, this utility model provides an anti-fog and anti-interference fire alarm device for wind turbine generator sets. The shielding cover forms a three-in-one anti-interference system of physical shielding, electrostatic discharge, and circuit filtering, effectively isolating electromagnetic radiation, static electricity, and power supply noise generated by the generator and frequency converter in the nacelle, avoiding signal distortion, and significantly improving the operational stability in strong electromagnetic environments. By simultaneously addressing industry pain points through smoke detectors and anti-fog false alarm detection components, it reduces the frequency of equipment failures, eliminates the safety hazards of manually shielding alarms, solves the problem of poor reliability of existing wind turbine smoke detectors, and improves the reliability of wind turbine fire early warning. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the system structure of an anti-fog and anti-interference fire alarm device for a wind turbine generator set in one embodiment of the present invention; Figure 2 This is a schematic diagram of the overall structure of an anti-fog and anti-interference fire alarm device for a wind turbine generator set in one embodiment of the present invention; Figure 3 This is a side view of a fire alarm device for wind turbine generator sets according to one embodiment of the present invention. Figure 4 This is a side view of a fire alarm device for wind turbine generator sets according to one embodiment of the present invention. Figure 5 This is a bottom view of a fire alarm device for wind turbine generator sets, as described in one embodiment of the present invention. Figure 6 for Figure 2 The illustrated embodiment is a longitudinal cross-sectional structural diagram of a fire alarm device for wind turbine generator sets that is resistant to fog and interference. Figure 7 for Figure 2 The illustrated embodiment is a vertical cross-sectional structural diagram of a fire alarm device for wind turbine generator sets that is resistant to fog and interference. Figure 8 This is a top view of a fire alarm device for wind turbine generator sets, as described in another embodiment of the present invention. Figure 9 for Figure 2 The embodiment shown is a schematic diagram illustrating the working principle of an anti-fog and anti-interference fire alarm device for wind turbine generator sets. Figure 10 This is a schematic diagram of the circuit principle of an anti-fog and anti-interference fire alarm device for a wind turbine generator set in one embodiment of the present invention; Figure 11 for Figure 2 The embodiment shown is a schematic diagram of the power supply circuit for an anti-fog and anti-interference fire alarm device for a wind turbine generator set. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] like Figures 1 to 8As shown, this utility model embodiment provides a fog-proof and interference-resistant fire alarm device for wind turbine generator sets, comprising: an alarm device body 1, which is installed inside the nacelle of the wind turbine generator set; the alarm device body 1 includes a support base 11, on which an electromagnetic interference-resistant shielding cover 12 is provided, and a sensing chamber 10 is formed inside the shielding cover 12; a circuit board 14 fixed to the support base 11 is provided inside the sensing chamber 10; the alarm device body also includes a main control module 15, an alarm 16, and a smoke detector 17, which are communicatively connected through the circuit board 14; the smoke detector 17 senses the ambient smoke signal in real time and transmits it to the main control module 15. The alarm device body also includes a fog-proof false alarm detection component 2 disposed in the sensing chamber 10. The fog-proof false alarm detection component 2 includes a condensation sensor 21 and a humidity sensor 22, which are communicatively connected to the main control module 15. The condensation sensor 21 collects environmental condensation signals in real time and transmits them to the main control module 15, and the humidity sensor 22 collects environmental air humidity signals in real time and transmits them to the main control module 15. The main control module 15 receives the smoke signal, the condensation signal, and the air humidity signal, and generates an alarm control command based on a preset judgment threshold, which is transmitted to the alarm device 16. The alarm device 16 executes the alarm control command and issues an alarm signal. The following is a detailed description of a fog-proof and anti-interference fire alarm device for wind turbine generator sets provided by this utility model embodiment.

[0021] like Figures 1 to 8As shown in this embodiment of the invention, the main control module 15 adopts the existing mature HT45F23A24. The SSAP-A chip and main control module 15 have built-in smoke concentration alarm thresholds, relative humidity high humidity interference thresholds, and condensation level trigger thresholds. After the device is powered on, the smoke detector 17, the condensation sensor 21, and the humidity sensor 22 continuously and cyclically collect environmental smoke signals, environmental condensation signals, and environmental air humidity signals. If the smoke concentration does not reach the smoke concentration alarm threshold, no alarm will be triggered regardless of whether the humidity or condensation state reaches the relative humidity high humidity interference threshold. If the smoke concentration reaches the smoke concentration alarm threshold, but the sensing chamber 10 has a condensation signal that reaches the condensation level trigger threshold, or the environmental relative humidity exceeds the relative humidity high humidity interference threshold, the main control module 15 determines it to be fog or condensation water vapor interference, blocks the alarm output, and does not trigger the alarm. Only when the smoke concentration reaches the smoke concentration alarm threshold, the condensation signal does not reach the condensation level trigger threshold, and the environmental humidity is lower than the set relative humidity high humidity interference threshold, is a real fire determined, and the main control module 15 sends an alarm control signal to the alarm 16. The alarm 16 executes the alarm control command and issues a fire alarm with sound and light. This utility model employs the detection structure of the condensation sensor 21 and the humidity sensor 22 to distinguish between local condensation in the sensing chamber 10 and global high humidity in the nacelle. Combined with the triple threshold joint verification of the smoke detector 17, it accurately distinguishes between fire smoke and fog. It eliminates false alarms in humid environments from two layers: hardware acquisition and logical judgment, and solves the problem of alarm failure in the condensation and fog conditions of the wind turbine nacelle.

[0022] like Figures 2 to 8 As shown in this embodiment of the invention, to avoid the influence of the external air environment on the data collection and further increase the accuracy of the sensing signal, a breathable protective grille 19 is provided inside the shielding cover 12. A receiving chamber 20 is provided inside the breathable protective grille 19, and the smoke detector 17 is disposed within the receiving chamber 20. The breathable protective grille 19 allows smoke to enter the detection area within the receiving chamber 20 evenly and smoothly, enabling the smoke detector 17 to collect signals accurately and in real time.

[0023] like Figures 2 to 8 As shown in this embodiment of the invention, to ensure the real-time performance and accuracy of environmental data acquisition, the humidity sensor 22 is fixedly mounted on the outside of the breathable protective grille 19, and the condensation sensor 21 is fixedly mounted on the outside of the breathable protective grille 19. The detection ends of both the condensation sensor 21 and the humidity sensor 22 are positioned directly facing the breathable protective grille 19, enabling precise real-time monitoring and acquisition of the relative humidity signal and water vapor condensation signal of the ambient air in the sensing chamber 10. Furthermore, to further shield electromagnetic interference, a flexible metal shielding film 18, electrically connected to the grounding terminal on the circuit board 14, is provided on the top of the breathable protective grille 19.

[0024] like Figures 9 to 10 As shown in the embodiment of this utility model, the smoke detector 17 can be selected from existing mature photoelectric smoke sensors. The infrared emitting branch PA1 of the main control module 15 outputs a modulation signal, which drives the infrared emitting tube D2 to emit modulated infrared light outward through the current limiting resistor R5; the capacitor C8 filters the power supply. In the infrared receiving branch of the main control module 15, the infrared receiving tube D3 receives the reflected infrared signal, and the signal is sent to the first channel of the operational amplifier (A1P / A1N / A1E); the resistors R6 and R8, the capacitors C9 and C10 constitute the external bias and RC filtering of the operational amplifier; completing signal amplification, filtering, and detection of whether there is an obstacle reflecting the infrared signal (proximity sensing function). The status display circuit of the smoke detector 17 is composed of the resistor R2 and the indicator diode D1, which indicates the operating status, alarm status, or low voltage status of the smoke detector. The power decoupling circuit of the smoke detector 17 consists of resistor R3, capacitor C6, and capacitor C5. When the indicator diode D1 (IRTX) of the smoke detector is ON, the large current generated by the conduction of transistor Q1 and indicator diode D1 will affect the stability of the power supply. At this time, a large-value electrolytic capacitor C7 is needed to stabilize the voltage. Otherwise, VDD may drop too much, which will affect the normal operation of the main control module 15HT45F23A. Therefore, resistor R3 and capacitor C7 are mainly used to eliminate the power supply noise generated when indicator diode D1 operates when emitting infrared light; while resistor R3 and capacitor C5 are mainly used to eliminate high-frequency noise generated in the circuit or coupled in from the outside.

[0025] like Figures 9 to 10 As shown in this embodiment of the invention, the condensation sensor circuit connected to the main control module 15 includes a voltage divider temperature measurement main circuit, a protection circuit, and a filtering circuit. The voltage divider temperature measurement main circuit includes a power supply interface VDD, a resistor R10, a temperature sensor NTC (thermistor CJ-10A), and a ground terminal GND connected in series. Resistor R10 forms a series voltage divider circuit. When the ambient temperature rises, the resistance of CJ-10A decreases, resulting in a decrease in the voltage at the voltage divider node; when the ambient temperature falls, the resistance of CJ-10A increases, resulting in an increase in the voltage at the voltage divider node. The voltage at the voltage divider node changes continuously with the temperature, forming an analog temperature measurement signal. The diode D4 (SP3002) in the protection circuit has its anode connected to the voltage divider node, and its cathode facing the ADC input terminal of the main control module 15. When an abnormal high voltage spike occurs at the voltage divider node, the diode conducts, limiting the maximum voltage sent to the pins of the main control module 15 and preventing electrostatic discharge and surges from damaging the I / O port of the main control module 15. Resistor R11 and capacitor C11 form an RC first-order low-pass filter circuit. The filter circuit removes power supply ripple and high-frequency electromagnetic interference, avoids frequent fluctuations in the sampling value of the ADC channel of the main control module 15, smooths voltage jumps, suppresses thermistor contact noise, and inputs the stable analog voltage after smoothing by the filter circuit into the ADC channel of the main control module 15.

[0026] like Figures 9 to 10 As shown in this embodiment of the invention, the humidity sensor circuit connected to the main control module 15 includes a signal voltage divider circuit, a protection circuit, and a filtering circuit. The signal voltage divider circuit includes a power supply interface VDD, a resistor R12, a humidity-sensitive resistor CJHR-31, and a ground terminal GND connected in series. Changes in ambient humidity → changes in the resistance of the humidity-sensitive resistor CJHR-31 → changes in the voltage at the voltage divider node: Increased humidity: decreased resistance of the humidity-sensitive resistor CJHR-31 → decreased voltage at the voltage divider node; decreased humidity: increased resistance of the humidity-sensitive resistor CJHR-31 → increased voltage at the voltage divider node. The protection circuit uses a diode D5 (SP3002) with its anode connected to the voltage divider node and its cathode pointing towards the PB3 pin of the main control module 15. The protection circuit provides positive voltage clamping and negative voltage protection. When the instantaneous voltage at the voltage divider node is higher than the voltage at pin PB3 of the main control module 15, the diode conducts, limiting excessive voltage from flowing into the main control module 15; it also suppresses electrostatic spikes, preventing the voltage from exceeding the IO withstand voltage of the main control module 15 and protecting it. Resistor R13 and capacitor C12 form an RC low-pass filter circuit: the filter circuit filters out high-frequency interference (power supply ripple, spatial electromagnetic interference), preventing humidity reading fluctuations; it slows down the rate of voltage change, suppressing noise at the humidity-sensitive resistor contacts; and capacitor C12 also acts as an electrostatic discharge buffer. The stable voltage after filtering is sent to pin PB3 (ADC channel) of the main control module 15.

[0027] like Figures 9 to 10 As shown in this embodiment of the invention, a switching output circuit is also provided between the main control module 15 and the alarm 16. The switching output circuit includes an optocoupler PC817 and a transistor S8050 connected in series, and a freewheeling diode D6 and a relay HK4100F-DC5V-SHG connected in parallel. A resistor R9 is connected in series between the main control module 15 and the optocoupler PC817. A resistor R14 is connected in series between the optocoupler PC817 and the transistor S8050. The optocoupler PC817 provides electrical isolation between the 3.3V main control module 15 circuit and the 5V relay power circuit. The switching output circuit corrects for external wiring interference and prevents surges from backflowing and damaging the main control module 15; this is a common anti-interference design used in fire-fighting equipment. Because the IO drive current of the main control module 15 is very small, it cannot directly drive the relay coil; the transistor S8050 acts as a current amplification switch. Since de-energizing the inductor (relay coil) inevitably generates a reverse high voltage, the freewheeling diode D6 can absorb the spikes and is an essential protection device. The NO / COM contacts of the relay HK4100F-DC5V-SHG are connected to the alarm to control the alarm and generate an alarm signal.

[0028] like Figures 2 to 8As shown in this embodiment of the invention, the shielding cover 12 is an integrated Faraday cage. Further, the Faraday cage is a copper-nickel alloy perforated mesh. The shielding cover 12 completely encloses the internal circuitry, and the Faraday cage, in conjunction with the grounding terminal external grounding wire on the circuit board 14, achieves static electricity discharge. A copper wire connected to the grounding terminal is connected to the nacelle grounding busbar to promptly release the static electricity accumulated in the shielding cover 12. To effectively balance the shielding effect with gas flow and heat dissipation performance, the mesh aperture of the perforated mesh is 0.8mm. Smoke and water vapor can normally enter the sensing chamber 10 without obstructing the detection ends of the condensation sensor 21 and the humidity sensor 22. During wind turbine nacelle operation, the electromagnetic radiation generated by the inverter and generator is completely blocked by the copper-nickel alloy Faraday cage, static electricity is discharged through the grounding terminal, and power and signal line interference noise is filtered out by a two-stage filtering circuit, preventing drift and distortion of the internal detection signal. Furthermore, the shielding cover 12 is integrally stamped with a condensation sensor clearance hole and a humidity sensor detection clearance hole for sensing gas to pass through. In foggy conditions or when condensation occurs on the nacelle interior walls, the condensation sensor 21 and the humidity sensor 22 simultaneously identify moisture interference, effectively avoiding false alarms and reliably providing early warning for wind turbine nacelles fires. The layout of the condensation sensor and the humidity sensor does not obstruct the smoke inlet passage, making it easy to modify or replace existing conventional smoke detectors, and it is compatible with installation in all types of wind turbine nacelles.

[0029] like Figure 11 As shown in the figure, the anti-fog and anti-interference fire alarm device provided in this embodiment of the utility model also includes a power supply circuit, which includes a DC power supply filter circuit and a voltage regulator filter circuit connected in series. The DC single-stage power supply filter circuit includes a DC single-stage power supply filter YB210D-3, used to suppress electromagnetic interference on the DC power line and filter out high-frequency noise from the power supply; the voltage regulator filter circuit includes a voltage regulator chip HT7333-1, used to perform secondary filtering of the power supply after the first filtering process and output DC power. The DC power is filtered by capacitors C1 and C2 and then sent to the voltage regulator chip U2 (HT7333-1). C3 and C4 further filter the output voltage, and finally output a stable 3.3V DC power supply VCC. Capacitors C1 and C2 are 10μF electrolytic capacitors, and C3 and C4 are 0.1μF ceramic capacitors.

[0030] In summary, the present invention provides a fog-proof and anti-interference fire alarm device for wind turbine generator sets. The shielding cover forms a three-in-one anti-interference system integrating physical shielding, electrostatic discharge, and circuit filtering, effectively isolating electromagnetic radiation, static electricity, and power supply noise generated by the generator and inverter in the nacelle, preventing signal distortion and equipment malfunction, and significantly improving operational stability in strong electromagnetic environments. By simultaneously addressing industry pain points through smoke detectors and fog false alarm detection components, it reduces equipment failure frequency, eliminates the safety hazards of manually shielding alarms, overcomes the poor reliability of existing wind turbine smoke detectors, and improves the reliability of wind turbine fire early warning systems.

[0031] Finally, it should be noted that in the description of this utility model, the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0032] Furthermore, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. Moreover, the terms "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 limitations, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal interconnected interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0033] Numerous specific details are set forth in this specification. However, it is understood that embodiments of this utility model can be practiced without these specific details. In the description of this specification, references to terms such as “one embodiment,” “some embodiments,” “example,” “specific example,” or “some examples,” etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this utility model. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification. Similarly, it should be understood that, in order to streamline the disclosure of this utility model and aid in the understanding of one or more aspects of the various utility models, in the above description of exemplary embodiments of this utility model, various features of the utility model are sometimes grouped together in a single embodiment, figure, or description thereof. However, this method of disclosure should not be interpreted as reflecting an intention that the claimed utility model requires more features than are expressly recited in each claim. Rather, as reflected in the claims, an aspect of the utility model lies in fewer than all the features of the single embodiment disclosed above. Therefore, the claims following the specific embodiments are hereby expressly incorporated into those specific embodiments, wherein each claim itself is a separate embodiment of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiments or examples. It should be noted that, without conflict or contradiction, the embodiments in this application and the specific features, structures, materials, or characteristics described therein can be combined with each other. The present invention is not limited to any single aspect, nor to any single embodiment, nor to any combination and / or substitution of these aspects and / or embodiments. Furthermore, without contradiction, those skilled in the art can use each aspect and / or embodiment of the present invention alone or in combination with one or more other aspects and / or embodiments thereof.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A fog resistant, tamper resistant fire alarm device for a wind turbine generator, comprising: include: The alarm device body is installed inside the nacelle of the wind turbine generator set. The alarm device body includes a support base, and an anti-electromagnetic interference shield is provided on the support base. An induction chamber is formed inside the shield. A circuit board fixed on the support base is disposed in the sensing chamber; The alarm device body also includes a main control module, an alarm, and a smoke detector that are communicated and connected via the circuit board; The smoke detector senses ambient smoke signals in real time and transmits them to the main control module. The alarm device body also includes a fog false alarm detection component disposed in the sensing chamber. The fog false alarm detection component includes a condensation sensor and a humidity sensor. The condensation sensor and the humidity sensor are respectively communicatively connected to the main control module. The condensation sensor collects environmental condensation signals in real time and transmits them to the main control module. The humidity sensor collects environmental air humidity signals in real time and transmits them to the main control module. The main control module receives the smoke signal, the condensation signal, and the air humidity signal, and generates an alarm control command based on a preset judgment threshold. The command is then transmitted to the alarm device, which executes the alarm control command and issues an alarm signal.

2. The anti-fog, anti-interference fire alarm device of claim 1, wherein, The shielding cover is provided with a breathable protective grille, and the breathable protective grille is provided with a receiving chamber, and the smoke detector is located in the receiving chamber.

3. The anti-fog, anti-interference fire alarm device of claim 2, wherein, The humidity sensor is fixedly mounted on the outside of the breathable protective grille, and the condensation sensor is fixedly mounted on the outside of the breathable protective grille. The detection ends of both the condensation sensor and the humidity sensor are positioned directly opposite the breathable protective grille.

4. The anti-fog, anti-interference fire alarm device of claim 2, wherein, The top of the breathable protective grille is provided with a flexible metal shielding film that is electrically connected to the grounding terminal on the circuit board.

5. The anti-fog, anti-interference fire alarm device of claim 1, wherein, It also includes a power supply circuit, which includes a DC power filter circuit for suppressing electromagnetic interference on the DC power line and filtering out high-frequency noise from the power supply, and a voltage regulator filter circuit for filtering the output voltage and output DC power. The DC power supply filter circuit and the voltage regulator filter circuit are connected in series.

6. The anti-fog, anti-interference fire alarm device of claim 1, wherein, The shielding cover is an integrated Faraday cage, which is electrically connected to the grounding terminal on the circuit board. The grounding terminal is used to connect external wires to achieve static discharge.

7. The anti-fog, anti-interference fire alarm device of claim 6, wherein, The Faraday cage is a copper-nickel alloy perforated mesh.

8. The anti-fog, anti-interference fire alarm device of claim 7, wherein, The mesh size of the perforated mesh is 0.8 mm.

9. The anti-fog, anti-interference fire alarm device of claim 1, wherein, The shielding cover has a condensation sensor clearance hole for sensing gas to pass through and a humidity sensor detection clearance hole.

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