Toxic and harmful gas concentration detection alarm device

Abstract

The invention discloses a poisonous and harmful gas concentration detection alarm device, and belongs to the technical field of gas detection. The existing toxic and harmful gas detection alarm device has the problems of inaccurate detection, insufficient consideration on the influence of environmental factors such as humidity and the like, and the like. The device comprises a shell, and a detection unit, an alarm unit and a control circuit unit are arranged in the shell. A gas outlet and a plurality of gas inlets in the detection unit are communicated with a diffusion chamber, a gas sensor, an anode, a cathode and an ion exchange membrane are arranged in the diffusion chamber, and humidity sensors are arranged at the gas outlet and the gas inlets; the alarm unit comprises a buzzer and an indicating lamp; the control circuit unit is formed by connecting a signal processing circuit, a microprocessor and the like. The gas concentration is detected through the detection unit, data of the humidity sensor are combined and processed through the control circuit unit, accurate detection is achieved, and the alarm unit gives an alarm when the gas concentration exceeds the standard. The device is mainly used for detecting and alarming the concentration of toxic and harmful gases in the environment.

Description

Technical Field

[0001] The present invention relates to the field of gas detection technology, and more specifically, to a toxic and harmful gas concentration detection and alarm device. Background Art

[0002] In many fields such as industrial production, environmental protection and daily life, accurate detection of toxic and harmful gas concentrations is crucial. The presence of toxic and harmful gases will not only pollute the environment, but also pose a serious threat to human health. Therefore, a reliable toxic and harmful gas concentration detection and alarm device is one of the key equipment to ensure safety. Existing toxic and harmful gas concentration detection and alarm devices, such as the patent with authorization announcement number CN213339076B, disclose an industrial toxic and harmful gas data detection and alarm device, which can detect and detect toxic and harmful gases in time, but there are still some problems to be solved in practical applications. First, the accuracy of detection needs to be improved. Due to the uneven diffusion and distribution of gas in the detection device, the gas sensor cannot fully and accurately obtain gas concentration information. Secondly, the existing device does not take into account the impact of environmental factors such as humidity. In the actual detection environment, humidity will have a significant impact on the performance of the gas sensor. Changes in humidity may cause the sensitivity of the gas sensor to decrease or cause misjudgment. Summary of the invention

[0003] An object of the present invention is to provide a toxic and harmful gas concentration detection and alarm device, which can effectively improve the detection accuracy and reduce the problem of sensor sensitivity reduction caused by environmental humidity.

[0004] In order to achieve these purposes and other advantages of the present invention, according to one aspect of the present invention, the present invention provides a toxic and harmful gas concentration detection and alarm device, including a housing, wherein the housing is provided with: A detection unit, comprising an air outlet and a plurality of air inlets arranged on a shell surface, and a diffusion chamber arranged inside the shell, wherein the air outlet and the plurality of air inlets are respectively communicated with the diffusion chamber, a plurality of gas sensors are installed in the diffusion chamber, parallel plate electrodes are respectively provided on both sides of the interior of the diffusion chamber as an anode and a cathode, an ion exchange membrane is provided between the anode and the cathode, a drainage pipe is provided at the bottom of the diffusion chamber near the cathode leading to the outside of the shell, and humidity sensors are installed at the air outlet and the plurality of air inlets; an alarm unit, which includes a buzzer and an indicator light; The control circuit unit comprises a signal processing circuit, a microprocessor, a storage circuit and a power supply circuit which are connected to each other, wherein the signal processing circuit is connected to a plurality of gas sensors and a humidity sensor, the microprocessor is connected to the alarm unit, and the power supply circuit is connected to the anode and the cathode.

[0005] Preferably, the diffusion chamber is a truncated cone structure, with a plurality of air inlet pipes respectively connected to a plurality of air inlets provided at the bottom, and an air outlet pipe connected to the air outlet provided at the top, the anode is fixedly installed near the top of the diffusion chamber by a plurality of insulating brackets, the cathode is fixedly installed near the bottom of the diffusion chamber by a plurality of insulating brackets, the ion exchange membrane is installed between the anode and the cathode, an annular groove is provided on the inner wall of the diffusion chamber, the periphery of the ion exchange membrane is fixed in the annular groove by an annular silicone sealing ring, a gap is retained between the anode and the cathode and the inner wall of the diffusion chamber, and a plurality of gas sensors are evenly distributed in a ring shape on the top of the diffusion chamber.

[0006] Preferably, outlets of multiple air inlet ducts are evenly distributed in a ring shape at the bottom of the diffusion chamber, the inlet of the air outlet duct is arranged at the top center of the diffusion chamber, and multiple guide plates are installed at the exhaust port, each guide plate is inclined at an angle of 45° to the axial direction of the corresponding air inlet duct outlet, and the inner wall of the diffusion chamber is provided with a spiral guide groove.

[0007] Preferably, the bottom of the diffusion chamber is designed to be a funnel-shaped structure, the drainage pipe is located at the lowest end of the center of the diffusion chamber, and a one-way valve is arranged in the drainage pipe.

[0008] Preferably, the anode and cathode are made of titanium-plated platinum material, and the surfaces of the anode and cathode are subjected to micro-roughening treatment, and the ion exchange membrane is a perfluorosulfonic acid ion exchange membrane.

[0009] Preferably, a plurality of air inlets are respectively arranged around the bottom of the shell and are evenly distributed in a ring shape, and the air outlet is arranged at the top of the shell.

[0010] Preferably, each air inlet is equipped with a filter and a flow controller, and the flow controller is connected to the microprocessor.

[0011] Preferably, the air outlet is connected to a micro air pump.

[0012] Preferably, the device further comprises a wireless communication unit and a remote control unit, wherein the wireless communication unit is connected to the microprocessor and is wirelessly connected to the remote control unit.

[0013] Preferably, the signal processing circuit includes: the output end of each gas sensor and humidity sensor is respectively connected to different input pins of the high-speed analog switch ADG732, the output pin of the high-speed analog switch ADG732 is connected to the input pin of the analog-to-digital converter ADS1256, when the high-speed analog switch ADG732 is switched to a certain sensor channel, the analog signal output by the sensor will be transmitted to the analog-to-digital converter ADS1256 through the high-speed analog switch ADG732, and the analog-to-digital converter ADS1256 converts the collected analog signal into a digital signal and transmits it to the microprocessor; The adaptive filtering and amplification circuit is set between the high-speed analog switch ADG732 and the analog-to-digital converter ADS1256. The programmable gain amplifier AD8250 is used to automatically adjust the amplification factor according to the sensor output signal strength, and then the digital filter MAX291 is used to filter the signal; The microprocessor uses an STM32F103 single-chip microcomputer, receives sensor data output by a signal processing circuit through an SPI interface, runs a preset algorithm to analyze and process the data, determines whether there is an abnormal concentration of toxic and harmful gases, triggers an alarm unit when an abnormality is detected, and can control related equipment according to preset rules; The storage circuit uses a large-capacity non-volatile memory, which is Samsung's K9F2G08U0M NAND Flash, and an encryption chip, which is Atmel ATSHA204A. The non-volatile memory is connected to the 8-bit data pin corresponding to the microprocessor through an 8-bit data bus. The control bus of the non-volatile memory is connected to the general I / O pin of the microprocessor and connected to the microprocessor. The encryption chip communicates with the microprocessor through an I2C interface to encrypt and decrypt the stored data. The SDA and SCL pins of the encryption chip ATSHA204A are respectively connected to the SDA and SCL pins corresponding to the I2C interface of the microprocessor. The storage circuit stores the historical data of the sensor, system configuration parameters and alarm record information, and is provided with a data encryption and backup mechanism to encrypt and regularly back up the stored data.

[0014] The present invention includes at least the following beneficial effects: the toxic and harmful gas concentration detection and alarm device provided by the present invention can realize effective detection and timely alarm of toxic and harmful gas concentrations, and the multiple air inlets and outlets in the detection unit are connected to the diffusion chamber, and cooperate with the multiple gas sensors in the diffusion chamber to comprehensively collect gas information and improve the accuracy of detection. In addition, the anode, cathode and ion exchange membrane are provided to pre-treat and dehumidify the gas, reduce the problem of decreased sensor sensitivity caused by environmental humidity, and help to detect gas components more accurately.

[0015] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of a toxic and harmful gas concentration detection and alarm device in a technical solution of the present invention; Figure 2 It is a structural schematic diagram of the diffusion chamber in a technical solution of the present invention; Figure 3 The present invention is a control circuit diagram in a technical solution. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can implement the invention with reference to the description.

[0018] It should be understood that the terms such as “having”, “including” and “comprising” used herein do not exclude the existence or addition of one or more other elements or combinations thereof.

[0019] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials can be obtained from commercial sources unless otherwise specified; in the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected, set, or detachably connected, set, or connected and set in one piece. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood in specific circumstances. The orientation or position relationship indicated by the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention.

[0020] like Figures 1 to 3 As shown, the present invention provides a toxic and harmful gas concentration detection and alarm device, including a housing 100, inside which are provided: A detection unit, comprising an air outlet 101 and a plurality of air inlets 102 arranged on the surface of a shell 100, and a diffusion chamber 200 arranged inside the shell 100, wherein the air outlet 101 and the plurality of air inlets 102 are respectively communicated with the diffusion chamber 200, a plurality of gas sensors (not shown in the figure) are installed in the diffusion chamber 200, parallel plate electrodes are respectively provided on both sides of the interior of the diffusion chamber 200 as an anode 201 and a cathode 202, an ion exchange membrane 203 is provided between the anode 201 and the cathode 202, a drainage pipe 204 is provided at the bottom of the diffusion chamber 200 near the cathode 202 leading to the outside of the shell 100, and humidity sensors are installed at the air outlet 101 and the plurality of air inlets 102; an alarm unit, which includes a buzzer and an indicator light; The control circuit unit includes a signal processing circuit, a microprocessor, a storage circuit and a power supply circuit which are connected to each other. The signal processing circuit is connected to a plurality of gas sensors and a humidity sensor. The microprocessor is connected to the alarm unit. The power supply circuit is connected to the anode 201 and the cathode 202.

[0021] The toxic and harmful gas concentration detection and alarm device described in the above technical solution is provided with a housing 100, which not only protects the internal components from the external environment, but also ensures the effective circulation and detection of the gas. The detailed structure inside the housing 100 includes: Detection unit: Located at the core of the shell 100. The design of the detection unit fully considers the diffusion and uniform distribution of the gas, so multiple air inlets 102 and an air outlet 101 are arranged on the surface of the shell 100, all of which are connected to the internal diffusion chamber 200. The interior of the diffusion chamber 200 is spacious enough to accommodate multiple high-precision gas sensors, which can monitor the concentration of various toxic and harmful gases in the passing gas in real time. On both sides of the diffusion chamber 200, an anode 201 and a cathode 202 are installed in parallel, and a layer of ion exchange membrane 203 is arranged between them, forming an electro-osmosis dehumidification mechanism, which is intended to effectively remove excess moisture in the gas through electro-osmosis, prevent the high humidity environment from interfering with the gas sensor, and ensure the accuracy of the detection results. In order to timely discharge the moisture generated during the dehumidification process, a drainage pipe 204 is arranged at the bottom of the diffusion chamber 200 near the cathode 202, and the drainage pipe 204 passes through the shell 100 to guide the moisture to the outside of the shell 100. At the same time, in order to ensure accurate control of gas humidity, highly sensitive humidity sensors are installed at the air inlet 102 and the air outlet 101, which can monitor the humidity level of the gas in real time.

[0022] Alarm unit: includes a loud buzzer and a striking indicator light. When the gas sensor detects that the concentration of harmful gases exceeds the standard or the humidity is abnormal, the microprocessor will immediately trigger the alarm unit, and send a clear and intuitive alarm to the operator through the sound of the buzzer and the flashing of the indicator light.

[0023] Control circuit unit: It integrates key components such as signal processing circuit, microprocessor, storage circuit and power supply circuit. The signal processing circuit is responsible for receiving and processing signals from gas sensors and humidity sensors, and converting them into data that can be recognized by the microprocessor. The microprocessor determines whether to trigger an alarm and whether to turn on the dehumidification mechanism based on the preset threshold. The storage circuit is used to save historical data and configuration information for subsequent analysis and optimization. The power supply circuit provides a stable and reliable power supply for the entire device, and is particularly connected to the anode 201 and the cathode 202 to provide the required power for the electro-osmosis dehumidification mechanism.

[0024] In practical applications, the toxic and harmful gas concentration detection alarm device is installed in an environment that needs to be monitored. The operator first sets appropriate thresholds for the gas sensor and humidity sensor through simple settings. Subsequently, the device starts to work normally, continuously inhaling the gas to be tested through the air inlet 102, and after being evenly distributed in the diffusion chamber 200, the gas sensor begins to monitor its composition in real time. When it is detected that the concentration of harmful gases exceeds the standard, the microprocessor will immediately start the alarm unit and sound an alarm through the buzzer and indicator light. When it is detected that the gas humidity is too high, the electro-osmosis dehumidification mechanism will start, and the excess moisture in the gas will be removed by electro-osmosis to ensure the accuracy of the test results. In addition, the storage circuit will continuously record the test data and alarm records for subsequent analysis and optimization by the operator. The power supply circuit ensures that the entire device can still work stably in harsh environments, providing a strong guarantee for safety monitoring.

[0025] In another technical solution, the diffusion chamber 200 is a truncated cone structure, with a plurality of air inlet pipes 205 respectively connected to a plurality of air inlets 102 at the bottom, and an air outlet pipe 206 connected to the air outlet 101 at the top. The anode 201 is fixedly installed near the top of the diffusion chamber 200 through a plurality of insulating brackets, and the cathode 202 is fixedly installed near the bottom of the diffusion chamber 200 through a plurality of insulating brackets. The ion exchange membrane 203 is installed between the anode 201 and the cathode 202. An annular groove is provided on the inner wall of the diffusion chamber 200, and the periphery of the ion exchange membrane 203 is fixed in the annular groove by an annular silicone sealing ring. A gap is retained between the anode 201 and the cathode 202 and the inner wall of the diffusion chamber 200, and a plurality of gas sensors are evenly distributed in a ring shape on the top of the diffusion chamber 200. In the present technical solution, the diffusion chamber 200 is designed as a truncated cone structure, which not only optimizes the flow path of the gas, but also enhances the uniformity of gas diffusion, thereby improving the accuracy of detection. The diffusion chamber 200 is wider at the bottom and narrower at the top. A plurality of air inlet pipes corresponding to the air inlet 102 are arranged at the bottom of the diffusion chamber 200. The air outlet pipe is arranged at the center of the top of the diffusion chamber 200 and is closely connected to the air outlet 101, which helps to guide the gas to flow smoothly from the air inlet 102 at the bottom and form a vortex inside the truncated cone, so that the gas diffusion is more uniform. The anode 201 is fixedly installed near the top of the diffusion chamber 200 through a plurality of sturdy and insulating brackets, while the cathode 202 is installed near the bottom through a similar bracket. A layer of ion exchange membrane 203 is embedded between the two, forming the core of the electro-osmosis dehumidification mechanism. In order to ensure the stable installation and sealing of the ion exchange membrane 203, an annular groove is opened on the inner wall of the diffusion chamber 200, and the periphery of the ion exchange membrane 203 is tightly fixed in the annular groove through an annular silicone sealing ring. A plurality of high-precision gas sensors are evenly distributed in an annular shape on the top of the diffusion chamber 200, ensuring that the gas sensors can fully and evenly contact the dehumidified gas, thereby improving the accuracy and reliability of the detection. Appropriate gaps are retained between the anode 201 and the cathode 202 and the inner wall of the diffusion chamber 200, which not only helps the smooth flow of gas, but also avoids direct contact between the electrode and the inner wall of the diffusion chamber 200, reducing potential interference and errors. When in use, the gas enters the interior of the truncated cone-shaped diffusion chamber 200 through the air inlet 102 and the air inlet pipe at the bottom. Under the action of the vortex formed inside the truncated cone, the gas is fully diffused. Excess moisture in the gas is removed by the electro-osmosis between the anode 201 and the cathode 202. The ion exchange membrane 203 and the silicone sealing ring ensure the sealing and stability during the dehumidification process. The truncated cone design of the diffusion chamber 200 and the annular distribution of the gas sensor further improve the accuracy and reliability of the detection.

[0026] In another technical solution, the outlets of multiple air intake pipes are evenly distributed in an annular shape at the bottom of the diffusion chamber 200, the inlet of the air outlet pipe is arranged at the top center of the diffusion chamber 200, and multiple guide plates (not shown in the figure) are installed at the exhaust port, each guide plate is inclined at a 45° angle to the axial direction of the corresponding air intake pipe outlet, and the inner wall of the diffusion chamber 200 is provided with a spiral guide groove (not shown in the figure). In this technical solution, the outlets of multiple air intake pipes are evenly distributed in an annular shape at the bottom of the diffusion chamber 200, ensuring that the gas can enter the diffusion chamber 200 evenly from all directions, avoiding the situation of excessively high or low local concentration. The inlet of the air outlet pipe is located at the top center of the diffusion chamber 200, which is conducive to the centralized discharge of the gas. Multiple guide plates are installed at the exhaust port, each guide plate is inclined at a 45° angle to the axial direction of the corresponding air intake pipe outlet. This design not only optimizes the flow path of the gas, reduces eddy currents and turbulence, but also improves the mixing uniformity of the gas, thereby enhancing the accuracy of the detection.

[0027] In another technical solution, the bottom of the diffusion chamber 200 is designed as a funnel-shaped structure, the drainage pipe 204 is located at the lowest end of the center of the diffusion chamber 200, and a one-way valve is arranged in the drainage pipe 204. In this technical solution, the bottom of the diffusion chamber 200 is designed as a funnel-shaped structure, which promotes the natural drainage and rapid discharge of the accumulated liquid inside. The bottom of the funnel gradually narrows until it is connected to the drainage pipe 204 located at the lowest end of the center of the diffusion chamber 200, effectively avoiding the retention and accumulation of liquid. The one-way valve is arranged in the drainage pipe 204, which effectively prevents the water from flowing back to the diffusion chamber 200 during the drainage process, thereby avoiding potential pollution and interference.

[0028] In another technical solution, the anode 201 and the cathode 202 are made of titanium platinum-plated materials, and the surfaces of the anode 201 and the cathode 202 are subjected to micro-roughening treatment, and the ion exchange membrane 203 is a perfluorosulfonic acid ion exchange membrane 203. In this technical solution, the anode 201 and the cathode 202 are made of high-performance titanium platinum-plated materials. Titanium platinum-plated materials have excellent corrosion resistance and electrical conductivity, and can operate stably for a long time in harsh environments. In addition, the surfaces of the anode 201 and the cathode 202 are also subjected to micro-roughening treatment, which not only increases the surface area and improves the contact efficiency with the gas, but also contributes to the adsorption and migration of water molecules during the electro-osmotic dehumidification process. The ion exchange membrane 203 uses a perfluorosulfonic acid ion exchange membrane 203, which has excellent ion selectivity and chemical stability, can effectively separate water molecules and ions in the gas, and ensure the stability and durability of the dehumidification effect.

[0029] In another technical solution, a plurality of air inlets 102 are respectively arranged around the bottom of the housing 100 and are evenly distributed in a ring shape, and the air outlet 101 is arranged at the top of the housing 100. In this technical solution, a plurality of air inlets 102 are respectively arranged around the bottom of the housing 100 and are evenly distributed in a ring shape. Such a layout ensures that the gas can enter the housing 100 evenly from all directions, avoiding the situation where the local concentration is too high or too low. The air outlet 101 is arranged at the top of the housing 100, which is conducive to the centralized discharge and subsequent treatment of the gas and optimizes the flow path of the gas.

[0030] In another technical solution, each air inlet 102 is equipped with a filter and a flow controller, and the flow controller is connected to the microprocessor. In this technical solution, each air inlet 102 is equipped with a filter and a flow controller. The function of the filter is to block large particles and impurities from entering the diffusion chamber 200, thereby protecting the gas sensor and internal components from contamination and damage. The flow controller is used to accurately control the gas flow entering the diffusion chamber 200 to ensure the stability and accuracy of the gas concentration. The flow controller is connected to the microprocessor to realize intelligent flow regulation and monitoring.

[0031] In another technical solution, the gas outlet 101 is connected to a micro air pump. In this technical solution, the gas outlet 101 is connected to a micro air pump. The function of the micro air pump is to provide a stable air flow power to ensure that the gas can be smoothly discharged from the diffusion chamber 200 and enter the subsequent processing equipment. This design not only improves the gas flow efficiency and detection speed, but also enhances the adaptability and flexibility of the device.

[0032] In another technical solution, a wireless communication unit and a remote control unit are also included, and the wireless communication unit is connected to the microprocessor and is wirelessly connected to the remote control unit. In this technical solution, the device is also equipped with a wireless communication unit and a remote control unit. The wireless communication unit is connected to the microprocessor to realize wireless transmission and remote monitoring of data. The remote control unit allows the operator to perform operations such as parameter setting, status query and troubleshooting on the device away from the site. This design not only improves the intelligence level of the device, but also reduces the risk and cost of on-site operations. Through the combination of wireless communication and remote control technology, real-time monitoring and remote management of toxic and harmful gas concentrations are realized, providing strong support for industrial safety and environmental protection.

[0033] In another technical solution, the signal processing circuit includes: the output end of each gas sensor and humidity sensor is respectively connected to different input pins of the high-speed analog switch ADG732, the output pin of the high-speed analog switch ADG732 is connected to the input pin of the analog-to-digital converter ADS1256, when the high-speed analog switch ADG732 is switched to a certain sensor channel, the analog signal output by the sensor will be transmitted to the analog-to-digital converter ADS1256 through the high-speed analog switch ADG732, and the analog-to-digital converter ADS1256 will convert the collected analog signal into a digital signal and transmit it to the microprocessor; The adaptive filtering and amplification circuit is set between the high-speed analog switch ADG732 and the analog-to-digital converter ADS1256. The programmable gain amplifier AD8250 is used to automatically adjust the amplification factor according to the sensor output signal strength, and then the digital filter MAX291 is used to filter the signal; The microprocessor uses an STM32F103 single-chip microcomputer, receives sensor data output by a signal processing circuit through an SPI interface, runs a preset algorithm to analyze and process the data, determines whether there is an abnormal concentration of toxic and harmful gases, triggers an alarm unit when an abnormality is detected, and can control related equipment according to preset rules; The storage circuit uses a large-capacity non-volatile memory, which is Samsung's K9F2G08U0M NAND Flash, and an encryption chip, which is Atmel ATSHA204A. The non-volatile memory is connected to the 8-bit data pin corresponding to the microprocessor through an 8-bit data bus. The control bus of the non-volatile memory is connected to the general I / O pin of the microprocessor and connected to the microprocessor. The encryption chip communicates with the microprocessor through an I2C interface to encrypt and decrypt the stored data. The SDA and SCL pins of the encryption chip ATSHA204A are respectively connected to the SDA and SCL pins corresponding to the I2C interface of the microprocessor. The storage circuit stores the historical data of the sensor, system configuration parameters and alarm record information, and is provided with a data encryption and backup mechanism to encrypt and regularly back up the stored data.

[0034] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. Toxic and harmful gas concentration detection and alarm device, characterized in that: It comprises a housing, inside which are provided: A detection unit, comprising an air outlet and a plurality of air inlets arranged on a shell surface, and a diffusion chamber arranged inside the shell, wherein the air outlet and the plurality of air inlets are respectively communicated with the diffusion chamber, a plurality of gas sensors are installed in the diffusion chamber, parallel plate electrodes are respectively provided on both sides of the interior of the diffusion chamber as an anode and a cathode, an ion exchange membrane is provided between the anode and the cathode, a drainage pipe is provided at the bottom of the diffusion chamber near the cathode leading to the outside of the shell, and humidity sensors are installed at the air outlet and the plurality of air inlets; an alarm unit, which includes a buzzer and an indicator light; The control circuit unit comprises a signal processing circuit, a microprocessor, a storage circuit and a power supply circuit which are connected to each other, wherein the signal processing circuit is connected to a plurality of gas sensors and a humidity sensor, the microprocessor is connected to the alarm unit, and the power supply circuit is connected to the anode and the cathode.

2. The toxic and harmful gas concentration detection and alarm device according to claim 1, characterized in that: The diffusion chamber is a truncated cone structure, with a plurality of air inlet pipes respectively connected to a plurality of air inlets at the bottom, and an air outlet pipe connected to the air outlet at the top. The anode is fixedly installed near the top of the diffusion chamber through a plurality of insulating brackets, and the cathode is fixedly installed near the bottom of the diffusion chamber through a plurality of insulating brackets. The ion exchange membrane is installed between the anode and the cathode. An annular groove is opened on the inner wall of the diffusion chamber, and the periphery of the ion exchange membrane is fixed in the annular groove by an annular silicone sealing ring. A gap is retained between the anode and the cathode and the inner wall of the diffusion chamber, and a plurality of gas sensors are evenly distributed in an annular shape on the top of the diffusion chamber.

3. The toxic and harmful gas concentration detection and alarm device according to claim 2, characterized in that: The outlets of multiple air intake pipes are evenly distributed in a ring shape at the bottom of the diffusion chamber, the inlet of the air outlet pipe is arranged at the top center of the diffusion chamber, and multiple guide plates are installed at the exhaust port. Each guide plate is inclined at an angle of 45° to the axial direction of the corresponding air intake pipe outlet, and the inner wall of the diffusion chamber is provided with a spiral guide groove.

4. The toxic and harmful gas concentration detection and alarm device according to claim 3, characterized in that: The bottom of the diffusion chamber is designed as a funnel-shaped structure. The drainage pipe is located at the lowest end of the center of the diffusion chamber. A one-way valve is arranged in the drainage pipe.

5. The toxic and harmful gas concentration detection and alarm device according to claim 1, characterized in that: The anode and cathode are made of titanium-plated platinum material, and the surfaces of the anode and cathode are subjected to micro-roughening treatment. The ion exchange membrane is a perfluorosulfonic acid ion exchange membrane.

6. The toxic and harmful gas concentration detection and alarm device according to claim 1, characterized in that: A plurality of air inlets are respectively arranged around the bottom of the shell and are evenly distributed in a ring shape, and the air outlet is arranged at the top of the shell.

7. The toxic and harmful gas concentration detection and alarm device according to claim 6, characterized in that: Each air inlet is equipped with a filter screen and a flow controller, and the flow controller is connected to the microprocessor.

8. The toxic and harmful gas concentration detection and alarm device according to claim 1, characterized in that: The air outlet is connected with a micro air pump.

9. The toxic and harmful gas concentration detection and alarm device according to claim 1, characterized in that: It also includes a wireless communication unit and a remote control unit. The wireless communication unit is connected to the microprocessor and is wirelessly connected to the remote control unit.

10. The toxic and harmful gas concentration detection and alarm device according to claim 1, characterized in that: The signal processing circuit comprises: the output end of each gas sensor and humidity sensor is respectively connected to different input pins of a high-speed analog switch, the output pin of the high-speed analog switch is connected to the input pin of an analog-to-digital converter, when the high-speed analog switch is switched to a certain sensor channel, the analog signal output by the sensor is transmitted to the analog-to-digital converter through the high-speed analog switch, and the analog-to-digital converter converts the collected analog signal into a digital signal and transmits it to the microprocessor; The adaptive filtering and amplification circuit is arranged between the high-speed analog switch and the analog-to-digital converter, and uses a programmable gain amplifier to automatically adjust the amplification factor according to the strength of the sensor output signal, and then uses a digital filter to filter the signal; The microprocessor adopts a single-chip computer, receives sensor data output by the signal processing circuit through the SPI interface, runs a preset algorithm to analyze and process the data, determines whether there is an abnormal concentration of toxic and harmful gases, triggers an alarm unit when an abnormality is detected, and can control related equipment according to preset rules; The storage circuit adopts a large-capacity non-volatile memory and an encryption chip. The non-volatile memory is connected to the data pin corresponding to the microprocessor through a data bus. The control bus of the non-volatile memory is connected to the general I / O pin of the microprocessor and connected to the microprocessor. The encryption chip communicates with the microprocessor through an I2C interface to encrypt and decrypt the stored data. The SDA and SCL pins of the encryption chip are respectively connected to the SDA and SCL pins corresponding to the I2C interface of the microprocessor. The storage circuit stores the historical data of the sensor, system configuration parameters and alarm record information, and is provided with a data encryption and backup mechanism to encrypt and regularly back up the stored data.

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