A gas alarm device based on gas flow channel and MEMS sensing array

Abstract

The application provides a gas alarm device based on a gas flow channel and a MEMS sensing array, which is used to solve the technical problem that the existing gas alarm device is difficult to identify data deviation when detecting data. Eight straight-through flow channel detection bodies are provided, and each of the straight-through flow channel detection bodies is provided with a MEMS sensor array circuit for collecting gas data; the eight straight-through flow channel detection bodies are symmetrically distributed at the center, four of which are located at the midpoints of the four oblique sides of a rhombus, and the other four are located on the horizontal and vertical lines of the four vertices of the rhombus and are arranged along the central ring array of the rhombus; and connecting pipelines are arranged between the eight straight-through flow channel detection bodies. Through the cooperation of the straight-through flow channel detection body and the MEMS sensor array, rapid response and qualitative and quantitative identification of combustible and explosive gas are realized.

Description

Technical Field

[0001] This utility model relates to the field of gas sensing and portable detection technology, and in particular to a gas alarm device based on a gas flow channel and a MEMS sensor array. Background Technology

[0002] Portable electronic noses acquire gas information through multiple cross-sensitive sensors, and then rapidly determine gas type and concentration through signal processing and pattern recognition. Existing portable devices often suffer from the following three problems due to their small size: First, most existing portable devices use single-cavity or rectangular array cavity detection. While the gas flow rate and velocity are consistent within the cavity, data deviations are difficult to identify when sensors in a single or multiple cavities malfunction or deviate. Second, in the gas flow process, insufficient airflow stability within the detection cavity leads to poor gas entry and exit, resulting in low contact efficiency between the gas and the sensor, directly affecting the detection response speed and initial accuracy. Third, in terms of thermal management, the detection cavity lacks proper heat dissipation design. The heat dissipation of the MEMS sensor disrupts the stability of the local temperature field, causing sensor baseline drift and continuous degradation of detection accuracy over long-term operation. Utility Model Content

[0003] The purpose of this invention is to provide a gas alarm device based on a gas flow channel and a MEMS sensor array. This addresses the technical problem of existing gas alarm devices struggling to identify data deviations during data detection.

[0004] A gas alarm device based on a gas flow channel and a MEMS sensor array includes eight through-flow channel detectors, each of which is equipped with a MEMS sensor array circuit for collecting gas data.

[0005] The eight straight-through flow channel detectors are centrally symmetrically distributed, with four of them located at the midpoints of the four hypotenuses of the rhombus; the other four are located on the horizontal and vertical lines connecting the four vertices of the rhombus and are arranged in a circular array along the center of the rhombus; connecting pipes are provided between the eight straight-through flow channel detectors.

[0006] Optionally, the straight-through flow channel detection body is provided with a detection cavity with a bottom opening;

[0007] The straight-through flow channel detection body has interfaces on its two symmetrical side walls that connect to the detection chamber, and the two interfaces for gas to pass through are arranged coaxially.

[0008] Optionally, the connecting pipeline includes air guide pipes connected to the interfaces on both sides of the straight-through flow channel detector, with the air guide pipes on both sides arranged coaxially.

[0009] Optionally, three-way valves are provided at the two symmetrical vertices of the rhombus, and four-way valves are provided at the other two symmetrical vertices of the rhombus and at the center of the rhombus.

[0010] The air guide pipes on both sides of the straight-through flow channel detector are connected to one port of a three-way valve and a four-way valve, respectively. The two four-way valves on the apex of the rhombus are also connected to one end of the air intake pipe and the exhaust pipe, respectively. The other end of the air intake pipe and the exhaust pipe are connected to the air distribution system controlled by software.

[0011] Optionally, a base plate is also included, on which all the straight-through flow channel detection bodies are mounted, and a sealing ring is provided between the bottom of the detection cavity and the base plate.

[0012] Optionally, the MEMS sensor array circuit includes a MEMS sensor array for acquiring gas data, a Bluetooth module for communication, a buzzer module for issuing alarm signals, an MCU module for controlling the MEMS sensor array, the Bluetooth module and the buzzer module, and a power supply module for supplying power to the MEMS sensor array circuit.

[0013] Optionally, the MEMS sensor array includes several MEMS gas sensors, which are arranged in a rectangular array.

[0014] Optionally, the MEMS gas sensor supplies power to the heating electrode via a power module, and the MEMS sensor array maintains a constant operating temperature.

[0015] Due to the adoption of the above technical solution, this utility model has the following advantages:

[0016] 1. This application achieves rapid response and qualitative and quantitative identification of flammable and explosive gases by combining a straight-through flow channel detection body structure with a MEMS sensor array. It is applicable to scenarios such as environmental monitoring, rapid screening of food quality, and industrial safety early warning.

[0017] 2. This application sets up eight straight-through flow channel detectors and places them at different positions in a rhombus, so that the gas velocity and flow rate entering the eight straight-through flow channel detectors are different. By comparing the collected data, data with large deviations can be effectively eliminated, and the detection accuracy of the system can be further improved.

[0018] 3. The MEMS gas sensor of this application provides a stable heating voltage to the heating electrode through a power module and an operational amplifier. This heating method can achieve rapid heating without the need for an additional heating structure, thereby reducing the size and power consumption of the device. At the same time, it reduces the impact of external ambient temperature fluctuations on the gas response, allowing the MEMS sensor array to maintain a constant operating temperature.

[0019] Other advantages, objectives, and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination and study, or may be learned from practice of this invention. The objectives and other advantages of this invention can be realized and obtained through the following description. Attached Figure Description

[0020] The accompanying drawings of this utility model are described below.

[0021] Figure 1 This is a schematic diagram of the gas alarm device of this utility model.

[0022] Figure 2 This is a schematic diagram of the structure of the straight-through flow channel detection array of this utility model.

[0023] Figure 3 This is a front view of the straight-through flow channel detection array of this utility model.

[0024] Figure 4 This is a schematic diagram of the internal structure of the straight-through flow channel detection array of this utility model.

[0025] Figure 5 This is the circuit diagram of the buzzer of this utility model.

[0026] Figure 6 Circuit diagram for powering the heating electrode of the MEMS gas sensor of this utility model.

[0027] In the diagram: 1-Straight-through flow channel detection body; 101-Detection chamber; 102-Interface; 2-MEMS sensor array circuit; 3-Connecting pipe; 301-Air guide pipe; 302-Three-way valve; 303-Four-way valve; 304-Inlet pipe; 305-Exhaust pipe; 4-Base plate. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Example:

[0030] like Figure 1 and Figure 4 The gas alarm device shown is based on a gas flow channel and a MEMS sensor array, including eight through-flow channel detectors 1, each of which is equipped with a MEMS sensor array circuit 2 for collecting gas data.

[0031] The eight straight-through flow channel detection bodies 1 are centrally symmetrically distributed, with four of them located at the midpoints of the four hypotenuses of the rhombus; the other four are located on the horizontal and vertical lines connecting the four vertices of the rhombus and are arranged in a circular array along the center of the rhombus; connecting pipes 3 are provided between the eight straight-through flow channel detection bodies 1.

[0032] In this embodiment, eight straight-through flow channel detectors 1 are provided and positioned at different locations within a rhombus, resulting in differences in the gas velocity and flow rate entering the eight detectors. By comparing the collected data, data with significant deviations can be effectively eliminated, further improving the system's detection accuracy. Figure 2 As shown, eight straight-through flow channel detectors 1 are labeled 1-1 to 1-8. In the figure, the theoretical flow rates and volumes in 1-1 and 1-2 are the same; in 1-3 and 1-4, they are the same; in 1-5 and 1-6, they are the same; the theoretical flow rates and volumes in 1-7 are less than those in 1-8; in 1-3 and 1-4, they are less than those in 1-7; in 1-1 and 1-2, they are less than those in 1-3 and 1-4; and in 1-5 and 1-6, they are less than those in 1-1 and 1-2. By using this theory to judge the gas concentration and other data collected by the system, data with large errors can be effectively eliminated, improving the detection accuracy of the system.

[0033] like Figure 1 and Figure 3 As shown, the straight-through flow channel detection body 1 has a detection cavity 101 with a bottom opening;

[0034] The straight-through flow channel detection body 1 has interfaces 102 on its two symmetrical side walls that connect to the detection chamber 101. The two interfaces 102 for gas to pass through are arranged coaxially.

[0035] In this embodiment, the detection cavity 101 is a gas flow space, allowing the gas to contact the MEMS sensor array circuit 2 to complete the detection. Figure 2 As shown, the interface 102 is either a threaded interface or a quick-connect interface. By setting the two interfaces 102 coaxially, the gas flows in from one interface in a straight line, passes through the internal cavity, and flows out from the other interface. There are no obvious bends or obstructions in the middle, forming a straight flow path, which realizes the "straight-through" flow of gas and helps to improve the efficiency and smoothness of gas transmission.

[0036] like Figure 1 and Figure 2As shown, the connecting pipe 3 includes an air guide pipe 301 connected to the interfaces 102 on both sides of the straight-through flow channel detection body 1. The air guide pipes 301 on both sides are arranged on the same axis. A three-way valve 302 is provided at the two vertices of the rhombus symmetry, and a four-way valve 303 is provided at the other two vertices of the rhombus symmetry and at the center of the rhombus.

[0037] The air guide pipes 301 on both sides of the straight-through flow channel detection body 1 are respectively connected to one port of the three-way valve 302 and the four-way valve 303. The two four-way valves 303 on the rhombus apex are also respectively connected to one end of the air intake pipe 304 and the exhaust pipe 305. The other end of the air intake pipe 304 and the exhaust pipe 305 are connected to the air distribution system controlled by software.

[0038] In this embodiment, the gas distribution system controls the solenoid valve through built-in software, thereby controlling a stable gas flow rate and controllable concentration, and delivering the gas in real time; the exhaust pipe 305 discharges waste gas through the pipe, ensuring the safety of flammable and explosive gases. This device, through an integrated hardware and software airflow control method, achieves flow uniformity and concentration adjustability during the detection process, improving the device's automation and qualitative and quantitative identification capabilities.

[0039] In this embodiment, the straight-through flow channel detector 1 is integrally injection molded from high-temperature resistant ABS plastic, which has the advantages of good airtightness and high thermal stability, effectively ensuring the uniformity of the gas flow field and the stability of the sensing response. The detection cavity dimensions are approximately 31.4 mm × 77 mm × 12 mm.

[0040] like Figure 1 and Figure 4 As shown, it also includes a base plate 4, and all the straight-through flow channel detection bodies 1 are mounted on the base plate 4. A sealing ring is provided between the bottom of the detection cavity 101 and the base plate 4.

[0041] In this embodiment, screw holes are provided on the straight-through flow channel detection body 1, the three-way valve 302 and the four-way valve 303, and they are locked to the base plate 4 by screws.

[0042] like Figure 4 , Figure 5 and Figure 6 As shown, the MEMS sensor array circuit 2 includes a MEMS sensor array for collecting gas data, a Bluetooth module for communication, a buzzer module for issuing alarm signals, an MCU module for controlling the MEMS sensor array, the Bluetooth module and the buzzer module, and a power supply module for supplying power to the MEMS sensor array circuit 2.

[0043] In this embodiment, the MEMS sensor array, Bluetooth module, buzzer module, MCU module, and power module are all mounted on a circuit board. The MCU module is an STM32F407ZGT6. The specific process for detecting and alarming flammable and explosive gases is as follows: First, the MCU module controls the analog-to-digital converter to collect data from the MEMS sensor array. Then, the data is sent to the host computer via the Bluetooth module. Next, the feature extraction and pattern recognition algorithm inside the MCU module identifies the results (feature extraction and pattern recognition are existing technologies and will not be described in detail in this application). Finally, the MCU module decides whether to control the buzzer module to issue an alarm based on the identification results (if flammable and explosive gases are detected, the buzzer module will sound an alarm).

[0044] like Figure 4 , Figure 5 and Figure 6 As shown, the MEMS sensor array includes several MEMS gas sensors, which are arranged in a rectangular array.

[0045] In this embodiment, there are 8 MEMS gas sensors, which are arranged in a 4-row, 2-column configuration.

[0046] In this embodiment, the MEMS gas sensor provides a stable heating voltage to the heating electrode through a power module and an operational amplifier. This heating method enables rapid heating without the need for an additional heating structure, thereby reducing the size and power consumption of the device. At the same time, it reduces the impact of external ambient temperature fluctuations on the gas response, allowing the MEMS sensor array to maintain a constant operating temperature.

[0047] In summary, the device can operate with low power consumption and continuously under constant temperature conditions. Furthermore, the sensor array exhibits a clear response to flammable and explosive gases, effectively determining their presence and issuing an alarm.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. A gas alarm device based on a gas flow channel and a MEMS sensor array, characterized in that, It includes eight through-channel detectors (1), each of which is equipped with a MEMS sensor array circuit (2) for collecting gas data. The eight straight-through flow channel detection bodies (1) are centrally symmetrically distributed, with four of the straight-through flow channel detection bodies (1) located at the midpoint of the four hypotenuses of the rhombus; the other four straight-through flow channel detection bodies (1) are located on the horizontal and vertical lines connecting the four vertices of the rhombus and arranged in a circular array along the center of the rhombus; connecting pipes (3) are provided between the eight straight-through flow channel detection bodies (1).

2. The gas alarm device based on a gas flow channel and a MEMS sensor array according to claim 1, characterized in that, The straight-through flow channel detection body (1) has a detection cavity (101) with an opening at the bottom. The straight-through flow channel detection body (1) has interfaces (102) on its two symmetrical side walls that connect to the detection chamber (101), and the two interfaces (102) for gas to pass through are arranged coaxially.

3. A gas alarm device based on a gas flow channel and a MEMS sensor array according to claim 2, characterized in that, The connecting pipeline (3) includes an air guide pipe (301) connected to the interfaces (102) on both sides of the straight-through flow channel detector (1), and the air guide pipes (301) on both sides are arranged coaxially.

4. A gas alarm device based on a gas flow channel and a MEMS sensor array according to claim 3, characterized in that, Three-way valves (302) are provided at the two symmetrical vertices of the rhombus, and four-way valves (303) are provided at the other two symmetrical vertices of the rhombus and at the center of the rhombus. The air guide pipes (301) on both sides of the straight-through flow channel detector (1) are connected to one port of the three-way valve (302) and the four-way valve (303), respectively. The two four-way valves (303) on the rhombus apex are also connected to one end of the air intake pipe (304) and the exhaust pipe (305), respectively. The other end of the air intake pipe (304) and the exhaust pipe (305) are connected to the air distribution system controlled by software.

5. A gas alarm device based on a gas flow channel and a MEMS sensor array according to claim 2, characterized in that, It also includes a base plate (4), and the straight-through flow channel detection body (1) is installed on the base plate (4). A sealing ring is provided between the bottom of the detection cavity (101) and the base plate (4).

6. A gas alarm device based on a gas flow channel and a MEMS sensor array according to claim 1, characterized in that, The MEMS sensor array circuit (2) includes a MEMS sensor array for collecting gas data, a Bluetooth module for communication, a buzzer module for issuing alarm signals, an MCU module for controlling the MEMS sensor array, the Bluetooth module and the buzzer module, and a power supply module for supplying power to the MEMS sensor array circuit (2).

7. A gas alarm device based on a gas flow channel and a MEMS sensor array according to claim 6, characterized in that, The MEMS sensor array includes several MEMS gas sensors, which are arranged in a rectangular array.

8. A gas alarm device based on a gas flow channel and a MEMS sensor array according to claim 7, characterized in that, The MEMS gas sensor supplies power to the heating electrode via a power module, and the MEMS sensor array maintains a constant operating temperature.

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