Ceiling type non-thermal image display fire early warning instrument and early warning system

Abstract

The invention relates to the technical field of fire early warning, and discloses a ceiling type non-thermal image display fire early warning instrument and early warning system, and the instrument comprises a sensor module which is used for collecting smoke concentration, temperature and thermal radiation data, and sensing a fire sign; the data acquisition module is used for collecting data acquired by the sensor; the alarm control module is used for controlling starting of an alarm device according to the analysis result and deciding whether to give an alarm or not; the communication transmission module is used for transmitting the state and early warning information of the system to a remote monitoring end or other related equipment; the positioning module is used for determining the general position of a fire and providing azimuth information for rescue. By adopting various sensors and a data processing technology, environmental interference is effectively eliminated, the accuracy of early warning is ensured, a flexible threshold setting and adjusting function enables related personnel to respond in time, a positioning module can accurately provide a fire position, rescue personnel can conveniently and rapidly arrive, the rescue efficiency is improved, and fire hazards are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of fire early warning, and in particular to a ceiling-mounted non-thermal image display fire early warning instrument and an early warning system. Background Art

[0002] With the development of society and the improvement of people's living standards, the scale and complexity of various buildings are increasing, and the potential risk of fire is also increasing. Early and accurate fire warning is crucial to protect people's lives and reduce property losses.

[0003] Traditional methods are often relatively simple and cannot effectively filter and analyze complex environmental interference. Most existing fire warning systems use fixed thresholds to determine whether a fire has occurred. They lack flexibility and are difficult to adapt to different scenarios and environmental conditions. The positioning accuracy and precision are insufficient, which makes it difficult for rescue personnel to arrive quickly, affects rescue efficiency, and makes it difficult to effectively control the hazards caused by the fire. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a ceiling-mounted non-thermal imaging fire warning device and warning system to solve the problems of untimely notification response, inability of relevant personnel to quickly obtain information, inaccurate positioning, affecting the rapid arrival of rescue personnel, low rescue efficiency, and poor fire hazard control effect.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A ceiling-mounted non-thermal image display fire warning system, comprising:

[0006] Sensor module, data acquisition module, signal processing module, data analysis module, threshold setting module, alarm control module, communication transmission module and positioning module;

[0007] The sensor module is used to collect smoke concentration, temperature, and thermal radiation data to sense signs of fire;

[0008] The data acquisition module is responsible for collecting data acquired by the sensor and performing preliminary sorting;

[0009] The signal processing module is used to filter and amplify the collected data to enhance the accuracy and availability of the data;

[0010] The data analysis module is used to analyze the processed data through algorithms and models to determine the possibility of fire occurrence;

[0011] The threshold setting module is used to set different warning thresholds so as to accurately distinguish between normal conditions and fire conditions;

[0012] The alarm control module is used to control the activation of the alarm device according to the analysis results and decide whether to sound an alarm;

[0013] The communication transmission module is used to transmit the system status and warning information to the remote monitoring terminal or other related equipment;

[0014] The positioning module is used to determine the approximate location of the fire and provide orientation information for rescue.

[0015] Preferably, the sensor module includes a smoke sensor unit, a temperature sensor unit and a thermal radiation sensor unit, the smoke sensor unit is used to detect the concentration of smoke particles in the air, the temperature sensor unit is used to measure the temperature value of the environment, and the thermal radiation sensor unit is used to sense the thermal radiation energy emitted by the object.

[0016] Preferably, the data acquisition module includes an analog-to-digital conversion unit and a data cache unit, the analog-to-digital conversion unit is used to convert the analog signal output by the sensor into a digital signal, and the data cache unit is used to temporarily store the collected data.

[0017] Preferably, the signal processing module includes a filtering unit, an amplifying unit and a noise reduction unit, the filtering unit is used to remove noise and interference in the signal to make the useful signal clearer, the amplifying unit is used to enhance the amplitude of weak signals and improve the detectability of the signal, and the noise reduction unit is used to further reduce the noise component in the signal.

[0018] Preferably, the data analysis module includes an algorithm operation unit, a data comparison unit and a pattern recognition unit. The algorithm operation unit is used to perform various calculations and logical judgments of data analysis, the data comparison unit is used to compare the processed data with preset standards or historical data, and the pattern recognition unit is used to identify specific patterns or features in the data to determine whether they meet the fire characteristics.

[0019] Preferably, the threshold setting module includes a threshold storage unit and a threshold adjustment unit, the threshold storage unit is used to store the set threshold data for judging fire, and the threshold adjustment unit is used to modify and optimize the threshold according to actual conditions and human factors.

[0020] Preferably, the alarm control module includes an alarm driving unit and a sound and light control unit, wherein the alarm driving unit is used to provide power and signals for the sound and light alarm to operate, and the sound and light control unit is used to specifically control the parameters of the sound volume and light flashing frequency of the sound and light alarm.

[0021] Preferably, the communication transmission module includes a wireless communication unit, a wired communication unit and a data encoding unit. The wireless communication unit is used to transmit data to other devices or networks wirelessly, and the wireless method includes Wi-Fi or Bluetooth. The wired communication unit is used to transmit data using a wired connection, and the data encoding unit is used to encode and compress the data to be transmitted.

[0022] Preferably, the positioning module includes a satellite positioning unit, an indoor positioning unit and a position calculation unit. The satellite positioning unit is used to determine the precise position of the device outdoors using satellite signals, and the satellite signals include GPS or Beidou. The indoor positioning unit is used to achieve position positioning in an indoor environment through positioning of radio frequency signals. The position calculation unit is used to calculate specific position coordinates through the received positioning signals.

[0023] A ceiling-mounted non-thermal imaging display fire warning device comprises a shell, a front inner wall of the shell is provided with a thermal imaging scanning lens, a front inner wall of the shell is provided with a thermal radiation lens, a ventilation slot is opened inside the lower side of the shell, a micro-motion ceiling structure is fixedly connected to the lower inner wall of the shell, a sensor is provided inside the shell, and the sensor is located on the lower side of the ventilation slot.

[0024] The present invention provides a ceiling-mounted non-thermal image display fire early warning device and early warning system. It has the following beneficial effects:

[0025] 1. The present invention effectively eliminates environmental interference and ensures the accuracy of early warning by adopting a variety of sensors and data processing technologies. Its flexible threshold setting and adjustment functions can adapt to different scenarios, improve the versatility of the system, enable relevant personnel to respond in time, and the positioning module can accurately provide the location of the fire, facilitate the rapid arrival of rescue personnel, improve rescue efficiency, and reduce fire hazards.

[0026] 2. The communication and positioning functions of the present invention ensure rapid information transmission and accurate positioning, accelerate rescue response, optimize rescue strategies, improve fire-fighting efficiency, and minimize property losses caused by fire. It is easy to install and has a wide detection range. The equipment is miniaturized, easy to operate, and has low maintenance costs. It is suitable for a variety of places.

[0027] 3. The present invention saves space and has a wide monitoring range through the ceiling-mounted design. The micro-motion ceiling-mounted structure and servo scanning system further improve the detection capability. The system is miniaturized and highly operable, easy to install and maintain, and reduces the cost of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a system architecture diagram of a ceiling-mounted non-thermal image display fire warning system of the present invention;

[0029] Figure 2A sensor module architecture diagram of a ceiling-mounted non-thermal image display fire warning system of the present invention;

[0030] Figure 3 This is a data acquisition module architecture diagram of a ceiling-mounted non-thermal image display fire warning system of the present invention;

[0031] Figure 4 This is a signal processing module architecture diagram of a ceiling-mounted non-thermal image display fire warning system of the present invention;

[0032] Figure 5 This is a data analysis module architecture diagram of a ceiling-mounted non-thermal image display fire warning system of the present invention;

[0033] Figure 6 This is a diagram of the architecture of a threshold setting module of a ceiling-mounted non-thermal image display fire warning system of the present invention;

[0034] Figure 7 This is a diagram of the alarm control module architecture of a ceiling-mounted non-thermal image display fire warning system of the present invention;

[0035] Figure 8 This is a communication transmission module architecture diagram of a ceiling-mounted non-thermal image display fire warning system of the present invention;

[0036] Fig. 9 This is a positioning module architecture diagram of a ceiling-mounted non-thermal image display fire warning system of the present invention;

[0037] Fig.10 A three-dimensional diagram of a ceiling-mounted non-thermal imaging fire warning device according to the present invention;

[0038] Fig.11 The present invention is a partial schematic diagram of a micro-motion ceiling structure of a ceiling-mounted non-thermal imaging fire warning device.

[0039] Among them, 1. Shell; 2. Thermal imaging scanning lens; 3. Thermal radiation lens; 4. Ventilation slot; 5. Micro-motion ceiling structure. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example:

[0042] Please see attached Figure 1 -Attached Fig. 9The embodiment of the present invention provides a ceiling-mounted non-thermal image display fire warning system, comprising:

[0043] Sensor module, data acquisition module, signal processing module, data analysis module, threshold setting module, alarm control module, communication transmission module and positioning module;

[0044] The sensor module is used to collect smoke concentration, temperature, thermal radiation data, and sense signs of fire;

[0045] The data acquisition module is responsible for collecting the data obtained by the sensor and performing preliminary sorting;

[0046] The signal processing module is used to filter and amplify the collected data to enhance the accuracy and availability of the data;

[0047] The data analysis module is used to analyze the processed data through algorithms and models to determine the possibility of fire;

[0048] The threshold setting module is used to set different warning thresholds in order to accurately distinguish between normal conditions and fire conditions;

[0049] The alarm control module is used to control the activation of the alarm device according to the analysis results and decide whether to sound an alarm;

[0050] The communication transmission module is used to transmit the system status and warning information to the remote monitoring terminal or other related equipment;

[0051] The positioning module is used to determine the approximate location of the fire and provide direction information for rescue.

[0052] The sensor module includes a smoke sensor unit, a temperature sensor unit and a thermal radiation sensor unit. The smoke sensor unit is used to detect the concentration of smoke particles in the air, the temperature sensor unit is used to measure the temperature value of the environment, and the thermal radiation sensor unit is used to sense the thermal radiation energy emitted by an object.

[0053] Specifically, the smoke sensor unit can timely capture the smoke signals generated in the early stage of a fire by monitoring the smoke particles in the air. It can issue an alarm when the fire just occurs and the smoke concentration is low, greatly improving the timeliness of fire warning and buying more precious time for personnel evacuation and fire fighting operations.

[0054] The temperature sensor unit accurately measures changes in ambient temperature, especially when a fire occurs, it can quickly sense a sharp rise in temperature, which helps to promptly detect abnormal temperature increases. As one of the important bases for fire judgment, it improves the accuracy and reliability of fire detection;

[0055] The thermal radiation sensor unit is sensitive to the thermal radiation energy emitted by objects and monitors potential fire sources or high-temperature areas. It can detect signs of fire in advance through changes in thermal radiation before obvious flames and a large amount of smoke form, thereby enhancing the system's early warning capabilities.

[0056] The data acquisition module includes an analog-to-digital conversion unit and a data cache unit. The analog-to-digital conversion unit is used to convert the analog signal output by the sensor into a digital signal, and the data cache unit is used to temporarily store the collected data.

[0057] Specifically, the analog-to-digital conversion unit accurately converts the continuously changing analog signal output by the sensor into a discrete digital signal for subsequent digital processing and analysis, thus realizing the interface between the analog world and the digital processing system, enabling the physical quantities collected by the sensor to be understood and processed by computers and digital circuits, and improving the accuracy and efficiency of signal processing;

[0058] During the data acquisition process, the data cache unit temporarily stores the digital data output from the analog-to-digital conversion unit to solve the problem of mismatch between data acquisition speed and subsequent processing speed, prevent data loss or overwriting, ensure data integrity and continuity, and provide a stable data source for subsequent processing and transmission.

[0059] The signal processing module includes a filtering unit, an amplifying unit and a noise reduction unit. The filtering unit is used to remove noise and interference in the signal to make the useful signal clearer. The amplifying unit is used to enhance the amplitude of weak signals and improve the detectability of the signal. The noise reduction unit is used to further reduce the noise component in the signal.

[0060] Specifically, the filtering unit selectively passes or suppresses different frequency components in the signal through specific filtering algorithms and circuits, removes noise and interference, highlights useful signal features, significantly improves the quality and clarity of the signal, reduces the impact of noise on subsequent processing and analysis, and enables the system to more accurately identify and process useful information;

[0061] The amplifier unit amplifies the weak input signal to reach the level range required by the subsequent processing circuit or equipment, enhances the signal strength, improves its anti-interference ability during transmission and processing, and ensures that the signal can be accurately detected and processed;

[0062] The noise reduction unit uses various noise reduction technologies and algorithms to further reduce the noise components that remain after filtering and amplification, optimize the purity of the signal, minimize the impact of noise on the signal, and improve the signal-to-noise ratio of the signal, providing a more reliable basis for subsequent accurate analysis and judgment.

[0063] The data analysis module includes an algorithm operation unit, a data comparison unit and a pattern recognition unit. The algorithm operation unit is used to perform various calculations and logical judgments of data analysis. The data comparison unit is used to compare the processed data with preset standards or historical data. The pattern recognition unit is used to identify specific patterns or features in the data and determine whether they meet the fire characteristics.

[0064] Specifically, the algorithm operation unit uses various mathematical and logical algorithms to perform complex calculations and reasoning on the collected and processed signal data, extract key information and features, and achieve in-depth mining and analysis of the data, providing strong support for subsequent judgments and decisions, and improving the intelligence level of the system;

[0065] The data comparison unit compares and evaluates the currently processed data in detail with the pre-set standard threshold, normal range or historical data, accurately determines whether the data is abnormal, promptly discovers potential fire risks, improves the accuracy and reliability of the system's early warning, and uses data matching and difference calculation technology to perform operations such as numerical comparison, trend analysis and deviation evaluation to determine the status of the data;

[0066] The pattern recognition unit uses machine learning and pattern recognition technology to identify specific patterns, features or regularities hidden in the data and determine whether they conform to the typical characteristics of fire. It can quickly and accurately identify fire-related patterns from complex data, reduce false alarms and missed alarms, and enhance the system's fire detection capabilities.

[0067] The threshold setting module includes a threshold storage unit and a threshold adjustment unit. The threshold storage unit is used to store the set threshold data for judging fire, and the threshold adjustment unit is used to modify and optimize the threshold according to the actual situation and human factors.

[0068] Specifically, the threshold storage unit safely and reliably stores the pre-set key threshold data for determining the occurrence of fire, ensuring that it can be quickly and accurately called during system operation, providing a stable reference standard for the system's real-time judgment, and ensuring the consistency and accuracy of the judgment;

[0069] The threshold adjustment unit flexibly modifies and optimizes the set threshold according to actual environmental changes, equipment performance differences and human experience, so that the system can better adapt to different application scenarios and conditions and improve the accuracy and reliability of fire judgment.

[0070] The alarm control module includes an alarm driving unit and an acoustic and light control unit. The alarm driving unit is used to provide power and signals for the operation of the acoustic and light alarm. The acoustic and light control unit is used to specifically control the parameters of the sound volume and light flashing frequency of the acoustic and light alarm.

[0071] Specifically, the alarm drive unit provides stable and sufficient power support for the sound and light alarm, and generates accurate control signals to ensure that the alarm can respond in time and enter the working state, and ensure that in the case of fire warning, the sound and light alarm can be reliably started, and there will be no situation where the alarm cannot be sounded due to insufficient power or signal errors;

[0072] The sound and light control unit finely adjusts and controls the sound intensity, sound type (such as continuous sound, intermittent sound, etc.), light color, light flashing frequency and mode and other parameters of the sound and light alarm, so that the sound and light alarm can attract people's attention in the most effective way, adapt to different environments and levels of urgency, while avoiding excessive stimulation or causing panic.

[0073] The communication transmission module includes a wireless communication unit, a wired communication unit and a data encoding unit. The wireless communication unit is used to transmit data to other devices or networks wirelessly. The wireless method includes Wi-Fi or Bluetooth. The wired communication unit is used to transmit data using a wired connection. The data encoding unit is used to encode and compress the data to be transmitted.

[0074] Specifically, the wireless communication unit uses wireless technologies such as Wi-Fi or Bluetooth to achieve wireless data transmission between the system and external devices or networks, get rid of the constraints of cables, improve the deployment flexibility and convenience of the system, and can quickly and stably send fire warning data to remote monitoring terminals, mobile devices or other related wireless receiving devices without relying on physical connections, so as to achieve real-time remote monitoring and control;

[0075] The wired communication unit establishes a stable and high-speed data transmission channel through wired connection methods such as Ethernet to ensure the accurate and timely transmission of large amounts of data. In scenarios where high requirements are placed on data transmission stability and speed, it provides reliable connections, avoids wireless signal interference and unstable transmission, and ensures error-free data transmission.

[0076] The data encoding unit encodes and compresses the data to be transmitted, reducing the amount of data, improving transmission efficiency, and reducing transmission costs. Under limited bandwidth resources, it can transmit more valid data, shorten transmission time, and reduce the probability of errors during data transmission.

[0077] The positioning module includes a satellite positioning unit, an indoor positioning unit and a position calculation unit. The satellite positioning unit is used to determine the precise position of the device outdoors using satellite signals. The satellite signals include GPS or Beidou. The indoor positioning unit is used to achieve position positioning in an indoor environment through the positioning of radio frequency signals. The position calculation unit is used to calculate the specific position coordinates through the received positioning signals.

[0078] Specifically, the satellite positioning unit receives positioning signals from satellite systems such as GPS or Beidou, and accurately calculates the geographical location of the device in an open outdoor area by measuring information such as the distance and angle between the satellite and the device. It can provide accurate location information for the fire warning system in an outdoor environment, helping the fire department to quickly locate the location of the fire and formulate efficient rescue strategies;

[0079] The indoor positioning unit uses radio frequency signals such as Wi-Fi, Bluetooth, and RFID, combined with the signal distribution characteristics and propagation models in the indoor environment, to locate the relative position of the device in the indoor environment in areas where satellite signals cannot effectively cover, such as inside buildings, to supplement the positioning capability, ensure that the location information of the device can be obtained in various environments, and improve the applicability of the system;

[0080] The position calculation unit integrates the positioning data from the satellite positioning unit and the indoor positioning unit, as well as other possible auxiliary positioning information including inertial sensor data, to perform precise position calculation and fusion processing, improve positioning accuracy and reliability, reduce the errors and limitations of a single positioning method, and provide continuous, stable and precise position output.

[0081] Please see attached Fig.10 -Attached Fig.11 A ceiling-mounted non-thermal imaging display fire warning device includes a shell 1, a thermal imaging scanning lens 2 is arranged on the front inner wall of the shell 1, a thermal radiation lens 3 is arranged on the front inner wall of the shell 1, a ventilation slot 4 is opened inside the lower side of the shell 1, a micro-motion ceiling structure 5 is fixedly connected to the lower inner wall of the shell 1, and a sensor is arranged inside the shell 1, and the sensor is located on the lower side of the ventilation slot 4.

[0082] Specifically, the shell 1 can protect the internal structure during use, and the thermal imaging scanning lens 2 can achieve the effect of thermal imaging scanning during use. During use, the thermal imaging scanning lens 2 cooperates with the threshold set by the system to determine whether a fire has occurred. The thermal radiation lens 3 cooperates with the threshold set by the system to determine whether a fire has occurred based on the scanned data. The micro-motion ceiling structure 5 can quickly install and use the shell 1 according to the needs of use. During use, the ventilation slot 4 can allow smoke to enter the ventilation slot 4 and collect data through sensors to read the smoke concentration in the fire and whether it contains harmful substances, and transmit the information to the outside world for countermeasures.

[0083] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A ceiling-mounted non-thermal image display fire warning system, characterized in that: include: Sensor module, data acquisition module, signal processing module, data analysis module, threshold setting module, alarm control module, communication transmission module and positioning module; The sensor module is used to collect smoke concentration, temperature, and thermal radiation data to sense signs of fire; The data acquisition module is responsible for collecting data acquired by the sensor and performing preliminary sorting; The signal processing module is used to filter and amplify the collected data to enhance the accuracy and availability of the data; The data analysis module is used to analyze the processed data through algorithms and models to determine the possibility of fire occurrence; The threshold setting module is used to set different warning thresholds so as to accurately distinguish between normal conditions and fire conditions; The alarm control module is used to control the activation of the alarm device according to the analysis results and decide whether to sound an alarm; The communication transmission module is used to transmit the system status and warning information to the remote monitoring terminal or other related equipment; The positioning module is used to determine the approximate location of the fire and provide orientation information for rescue.

2. A ceiling-mounted non-thermal image display fire warning system according to claim 1, characterized in that: The sensor module includes a smoke sensor unit, a temperature sensor unit and a thermal radiation sensor unit. The smoke sensor unit is used to detect the concentration of smoke particles in the air, the temperature sensor unit is used to measure the temperature value of the environment, and the thermal radiation sensor unit is used to sense the thermal radiation energy emitted by an object.

3. The ceiling-mounted non-thermal image display fire warning system according to claim 1, characterized in that: The data acquisition module includes an analog-to-digital conversion unit and a data cache unit. The analog-to-digital conversion unit is used to convert the analog signal output by the sensor into a digital signal, and the data cache unit is used to temporarily store the collected data.

4. The ceiling-mounted non-thermal image display fire warning system according to claim 1, characterized in that: The signal processing module includes a filtering unit, an amplifying unit and a noise reduction unit. The filtering unit is used to remove noise and interference in the signal to make the useful signal clearer. The amplifying unit is used to enhance the amplitude of weak signals and improve the detectability of the signal. The noise reduction unit is used to further reduce the noise component in the signal.

5. The ceiling-mounted non-thermal image display fire warning system according to claim 1, characterized in that: The data analysis module includes an algorithm operation unit, a data comparison unit and a pattern recognition unit. The algorithm operation unit is used to perform various calculations and logical judgments of data analysis, the data comparison unit is used to compare the processed data with preset standards or historical data, and the pattern recognition unit is used to identify specific patterns or features in the data to determine whether they meet the fire characteristics.

6. The ceiling-mounted non-thermal image display fire warning system according to claim 1, characterized in that: The threshold setting module includes a threshold storage unit and a threshold adjustment unit. The threshold storage unit is used to store the set threshold data for judging fire, and the threshold adjustment unit is used to modify and optimize the threshold according to actual conditions and human factors.

7. The ceiling-mounted non-thermal image display fire warning system according to claim 1, characterized in that: The alarm control module includes an alarm driving unit and an acoustic and optical control unit. The alarm driving unit is used to provide power and signals for the operation of the acoustic and optical alarm. The acoustic and optical control unit is used to specifically control the parameters of the sound volume and light flashing frequency of the acoustic and optical alarm.

8. The ceiling-mounted non-thermal image display fire warning system according to claim 1, characterized in that: The communication transmission module includes a wireless communication unit, a wired communication unit and a data encoding unit. The wireless communication unit is used to transmit data to other devices or networks wirelessly. The wireless method includes Wi-Fi or Bluetooth. The wired communication unit is used to transmit data using a wired connection. The data encoding unit is used to encode and compress the data to be transmitted.

9. The ceiling-mounted non-thermal image display fire warning system according to claim 1, characterized in that: The positioning module includes a satellite positioning unit, an indoor positioning unit and a position calculation unit. The satellite positioning unit is used to determine the precise position of the device outdoors using satellite signals. The satellite signals include GPS or Beidou. The indoor positioning unit is used to achieve position positioning in an indoor environment through positioning of radio frequency signals. The position calculation unit is used to calculate specific position coordinates through the received positioning signals.

10. A ceiling-mounted non-thermal image display fire warning device, applied to a ceiling-mounted non-thermal image display fire warning system according to any one of claims 1 to 9, comprising a housing (1), characterized in that: A thermal imaging scanning lens (2) is arranged on the front inner wall of the shell (1), a thermal radiation lens (3) is arranged on the front inner wall of the shell (1), a ventilation slot (4) is provided inside the lower side of the shell (1), a micro-motion ceiling structure (5) is fixedly connected to the lower inner wall of the shell (1), and a sensor is arranged inside the shell (1), and the sensor is located on the lower side of the ventilation slot (4).

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