Gas sensor

Abstract

The utility model discloses a gas sensor which comprises a substrate, a plurality of sensing elements, a gas flow channel and an adjusting assembly, wherein the substrate is provided with a control unit; the plurality of sensing elements are arranged on the substrate and are electrically connected with the control unit; the airflow channel is installed on the substrate, the sensing elements are arranged in the airflow channel, and the airflow channel comprises an air inlet and an air outlet; the adjusting assembly is electrically connected with the control unit and comprises a first electromagnetic valve and a second electromagnetic valve, the first electromagnetic valve is arranged at the air inlet, and the second electromagnetic valve is arranged at the air outlet; the gas sensor has a gas inlet state and a gas outlet state, when the gas sensor is in the gas inlet state, the first electromagnetic valve is opened, the second electromagnetic valve is closed, and when the gas sensor is in the gas outlet state, the first electromagnetic valve is closed, and the second electromagnetic valve is opened. The two states of the gas sensor are switched in order, so that the shunting and isolating operation of the gas is realized, and the detection accuracy of the gas sensor is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensor element modules, and in particular relates to a gas sensor. Background Art

[0002] With the rapid development of the Internet of Things, intelligent manufacturing and other fields, sensor components are being used more and more widely in various systems. Sensor components can be integrated into more devices and systems, providing more accurate and efficient monitoring and control methods for all walks of life.

[0003] In the related art, in order to realize the function of gas detection, a gas sampling hole is directly opened at the corresponding position of the gas sensor. However, the external gas atmosphere is complex. During the air intake and exhaust process, the gas in the gas sensor will continue to be disturbed by the external gas, resulting in errors in the detection results of the gas sensor. Utility Model Content

[0004] The technical purpose of the utility model is to provide a gas sensor, aiming to solve the problem that the detection result of the gas sensor has errors.

[0005] In order to solve the above technical problems, the utility model is implemented as follows: a gas sensor, characterized in that it includes:

[0006] a base plate on which a control unit is mounted;

[0007] A plurality of sensor elements are disposed on the substrate and are electrically connected to the control unit;

[0008] An air flow channel is mounted on the substrate, each of the sensing elements is arranged in the air flow channel, and the air flow channel includes an air inlet and an air outlet;

[0009] A regulating component, electrically connected to the control unit, the regulating component comprising a first solenoid valve and a second solenoid valve, the first solenoid valve being arranged at the air inlet, and the second solenoid valve being arranged at the air outlet;

[0010] The gas sensor has an intake state and an exhaust state. When the gas sensor is in the intake state, the first solenoid valve is opened and the second solenoid valve is closed. When the gas sensor is in the exhaust state, the first solenoid valve is closed and the second solenoid valve is opened.

[0011] In some embodiments of the present invention, the regulating component also includes a flow meter, which is electrically connected to the control unit and is used to detect the gas flow entering the air flow channel, and the flow meter and the first solenoid valve are arranged at intervals at the air inlet.

[0012] In some embodiments of the present invention, a filter screen is provided in the air inlet.

[0013] In some embodiments of the present invention, the first solenoid valve and the air inlet together form an air inlet channel, the second solenoid valve and the air outlet together form an air outlet channel, and the volume of the air inlet channel is greater than the volume of the air outlet channel.

[0014] In some embodiments of the present invention, a cross-sectional area of ​​the air inlet passage gradually increases along a direction from the air inlet to the first solenoid valve.

[0015] In some embodiments of the present invention, a plurality of protrusions are provided in the air inlet passage, the protrusions are arranged at intervals, and the protrusion heights of two adjacent protrusions are different.

[0016] In some embodiments of the present invention, the substrate has a first mounting surface and a second mounting surface disposed opposite to each other, the control unit is disposed on at least one of the first mounting surface and the second mounting surface, and the sensor elements are arranged on the first mounting surface at intervals.

[0017] In some embodiments of the present invention, the substrate further includes an airway wall protruding from the first mounting surface, the airway wall is disposed on the periphery of the plurality of sensor elements, and the airway wall and the first mounting surface are combined to form the airflow channel.

[0018] In some embodiments of the present invention, a sensing surface of each of the sensing elements is parallel to the first mounting surface.

[0019] In some embodiments of the present invention, the distance between the sensing surface of each sensing element and the first mounting surface remains the same.

[0020] In some embodiments of the present invention, the first mounting surface and the second mounting surface are both provided with a plurality of pins arranged at intervals, and each of the pins is electrically connected to the control unit and each of the sensor elements accordingly.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The utility model discloses a gas sensor, comprising a substrate, a plurality of sensing elements, an airflow channel and an adjusting component; wherein a control unit is installed on the substrate; a plurality of sensing elements are arranged on the substrate and are electrically connected to the control unit; the airflow channel is installed on the substrate, and each sensing element is arranged in the airflow channel, and the airflow channel comprises an air inlet and an air outlet; the adjusting component is electrically connected to the control unit, and the adjusting component comprises a first solenoid valve and a second solenoid valve, the first solenoid valve is arranged at the air inlet, and the second solenoid valve is arranged at the air outlet; the gas sensor has an intake state and an exhaust state, when the gas sensor is in the intake state, the first solenoid valve is opened, and the second solenoid valve is closed, and when the gas sensor is in the exhaust state, the first solenoid valve is closed, and the second solenoid valve is opened.

[0023] When the first solenoid valve is opened, the air inlet is connected to the gas to be detected, and the gas to be detected enters the air flow channel. The multiple sensor elements in the air flow channel are used to sense various parameters of the gas, such as gas concentration, gas pressure, gas temperature, gas humidity, etc. Each sensor element senses a different type of odor. Setting multiple sensor elements can increase the detection range of the gas sensor. The second solenoid valve is closed, so that the air outlet is disconnected from the external atmosphere, which can effectively limit the escape of the gas to be detected in the air flow channel.

[0024] When the first solenoid valve is closed, the air inlet is closed, the second solenoid valve is opened, and the air outlet is connected to the outside atmosphere. The gas after detection flows to the outside from the air outlet. The closed air inlet prevents new gas to be detected from entering the air flow channel, avoiding contamination caused by gas alignment in the previous sequence. The orderly switching of the two states of the gas sensor realizes the gas diversion and isolation operation, and improves the detection accuracy of the gas sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of a gas sensor in one embodiment of the utility model;

[0026] Figure 2 yes Figure 1 Schematic diagram of the cross-sectional structure of the gas sensor.

[0027] In the accompanying drawings, each reference numeral represents:

[0028] 100, gas sensor; 11, substrate; 111, control unit; 12, sensing element; 13, airway wall; 131, air flow channel; 132, air inlet; 133, air outlet; 14, first solenoid valve; 15, second solenoid valve; 16, flow meter; 17, filter; 18, pin. DETAILED DESCRIPTION

[0029] The embodiments of the utility model are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0032] Please refer to Figure 1 and Figure 2 The utility model provides a gas sensor 100, comprising a substrate 11, a plurality of sensor elements 12, an air flow channel 131 and an adjusting component; wherein the substrate 11 is installed with a control unit 111; a plurality of sensor elements 12 are arranged on the substrate 11 and are electrically connected to the control unit 111; the air flow channel 131 is installed on the substrate 11, each sensor element 12 is arranged in the air flow channel 131, and the air flow channel 131 comprises an air inlet 132 and an air outlet 133; the adjusting component is electrically connected to the control unit 111, and the adjusting component comprises a first solenoid valve 14 and a second solenoid valve 15, the first solenoid valve 14 is arranged at the air inlet 132, and the second solenoid valve 15 is arranged at the air outlet 133; the gas sensor 100 has an intake state and an exhaust state, when the gas sensor 100 is in the intake state, the first solenoid valve 14 is opened, and the second solenoid valve 15 is closed, when the gas sensor 100 is in the exhaust state, the first solenoid valve 14 is closed, and the second solenoid valve 15 is opened.

[0033] When the first solenoid valve 14 is opened, the air inlet 132 is connected to the gas to be detected, and the gas to be detected enters the airflow channel 131. The multiple sensor elements 12 in the airflow channel 131 are used to sense various parameters of the gas, such as gas concentration, gas pressure, gas temperature, gas humidity, etc. Each sensor element 12 senses a different type of odor. The provision of multiple sensor elements 12 can increase the detection range of the gas sensor 100. The second solenoid valve 15 is closed, so that the air outlet 133 is disconnected from the external atmosphere, which can effectively limit the escape of the gas to be detected in the airflow channel 131 and improve the detection effect of the gas sensor 100.

[0034] When the first solenoid valve 14 is closed, the air inlet 132 is closed, the second solenoid valve 15 is opened, and the air outlet 133 is connected to the external atmosphere. The gas after detection flows to the outside from the air outlet 133. The closed air inlet 132 prevents new gas to be detected from entering the air flow channel 131, avoiding contamination caused by gas alignment in the previous sequence, realizing the gas diversion and isolation operation, and improving the detection accuracy of the gas sensor 100. In order to facilitate the discharge of the gas detected in the air flow channel 131, an air pump can be installed at the second solenoid valve 15 to quickly suck out the gas in the air flow channel 131, further improving the detection efficiency of the gas sensor 100.

[0035] In this embodiment, please refer to Figure 1 , the regulating component also includes a flow meter 16, which is electrically connected to the control unit 111 and is used to detect the gas flow entering the air flow channel 131. The flow meter 16 and the first solenoid valve 14 are arranged at intervals at the air inlet 132. The control unit 111 can control the coverage area of ​​the first solenoid valve 14 in the air flow channel 131, that is, the first solenoid valve 14 can control the passage area of ​​the air flow channel 131. When the passage area is smaller, the air flow passing through is smaller, and the passage area is larger, the air flow passing through is larger. The flow meter 16 feeds back the obtained flow data to the control unit 111. When the flow meter 16 obtains that the air flow passing through within a preset time is less than the preset air flow, the control main board controls the valve of the first solenoid valve 14 to retract and expand the passage area of ​​the air flow channel 131. Conversely, when the air flow is greater than the preset air flow, the control main board controls the valve of the first solenoid valve 14 to extend and reduce the passage area of ​​the air flow channel 131.

[0036] This arrangement achieves precise control of the gas flow in the gas flow channel 131, so that the actual gas flow is stabilized near the preset target value. The gas flow that meets the preset target value is completely dispersed in the gas flow channel 131, and each sensor element 12 can fully contact the gas to be detected, effectively improving the accuracy of gas detection by the gas sensor 100.

[0037] Furthermore, a filter 17 is provided in the air inlet 132. The gas to be detected connected to the gas sensor 100 may contain impurities such as dust, which may pollute the atmosphere in the airflow channel 131. The filter 17 can effectively isolate external dirt, and the detection accuracy of the sensor element 12 to the detection gas can be effectively improved after filtering by the filter 17, and the residual substances in the gas flow channel are reduced, and the internal dirt is prevented from accumulating, thereby increasing the service life of the gas sensor 100.

[0038] In this embodiment, the first solenoid valve 14 and the air inlet 132 enclose an air inlet channel, and the second solenoid valve 15 and the air outlet 133 enclose an air outlet channel, and the volume of the air inlet channel is greater than the volume of the air outlet channel. A large-volume air inlet channel can reduce the resistance when the gas enters. When the gas flows in from a relatively spacious space, its flow rate decreases, and the corresponding pressure loss is also reduced, which helps to maintain a more stable pressure on the air inlet side.

[0039] The larger air inlet channel is equivalent to providing a larger "buffer zone" in which the gas velocity and pressure can have more room to adjust, reducing the pressure fluctuations that may be caused by the high-speed airflow directly entering the sensor element 12, allowing the gas to be more evenly distributed on the air inlet surface of the sensor element 12, reducing local pressure or velocity peaks, and helping to maintain the pressure stability of the entire system.

[0040] The main function of the gas outlet channel is to remove the analyzed gas inside, and its sensitivity and influence on pressure change are relatively small. If the gas outlet channel is too large, the gas inside the sensor element 12 may flow out too quickly, affecting the continuous monitoring and analysis stability of the gas composition by the sensor element 12.

[0041] Furthermore, the cross-sectional area of ​​the air inlet passage gradually increases along the direction from the air inlet 132 to the first solenoid valve 14. Such a configuration can effectively reduce the speed of air intake, increase the stability of the airflow, and disperse the pressure of air intake, reduce the impact on the inside of the sensor element 12, and allow the gas to be decelerated and pressure balanced to a certain extent before entering the sensor element 12, which helps to improve the accuracy and stability of detection.

[0042] In this embodiment, a plurality of protrusions are provided in the air inlet channel, and the protrusions are arranged at intervals, and the protrusion heights of two adjacent protrusions are different. When the gas flows in from the air inlet 132, the protrusions can help guide the airflow to smoothly enter the sensor element 12. This guiding effect reduces the situation where the airflow directly impacts the wall of the air inlet channel and reduces the turbulence phenomenon at the airflow entrance. Turbulence is one of the main factors that lead to increased resistance, so by reducing turbulence, the entrance resistance of the air inlet 132 can be effectively reduced.

[0043] At the same time, the plurality of bumps can also help the airflow to be more evenly distributed inside the air inlet. The bumps affect the airflow path through their structure, forcing the airflow to be redistributed before entering the sensing element 12, thereby avoiding the situation where the airflow is too concentrated in certain areas. This uniform distribution helps the sensing element 12 to more effectively capture and analyze the incoming gas, and improves the measurement accuracy and response speed of the sensing element 12.

[0044] The staggered high and low bump layout creates more airflow paths, allowing the airflow to be continuously guided and redirected as it enters the sensor. The airflow will experience continuous acceleration and deceleration in the staggered high and low bumps, which helps to smooth the dynamic changes of the airflow. The higher bumps first contact the airflow, which has the effect of decelerating and initially dispersing the pressure, while the lower bumps allow the airflow to gradually recover its speed. This layout can more finely adjust the airflow state, avoid sudden changes in pressure and speed, and thus alleviate pressure fluctuations within the entire system.

[0045] Furthermore, the extension direction of the bump may have an angle with the extension direction of the air inlet channel to reduce or eliminate dead zones or stagnant zones in the air inlet channel, thereby ensuring that the gas passes through the air inlet channel more efficiently and promoting the diffusion of the gas in the sensor element 12, reducing the gas concentration gradient, and improving the accuracy and stability of the sensor element 12.

[0046] At the same time, each protrusion is provided with a chamfered surface at one end facing the air inlet 132. The setting of the chamfered surface can prevent the space through which the airflow passes through the air inlet 132 from being too narrow, effectively reduce the flow rate of the airflow, and more evenly disperse the airflow in the air inlet channel. In other embodiments, the height of each protrusion from the air inlet 132 to the first solenoid valve 14 gradually decreases. When the airflow first passes through the higher protrusions, these protrusions will play a certain blocking role, reduce the speed of the airflow, and begin to buffer the pressure of the airflow. As the airflow moves toward the sensor element 12, the reduction in the height of the protrusion allows the airflow to gradually accelerate while maintaining a smooth transition of pressure. This design effectively achieves a gradual adjustment of pressure and reduces sudden changes in pressure, thereby helping to stabilize the flow of gas in the sensor element 12.

[0047] In this embodiment, the substrate 11 has a first mounting surface and a second mounting surface that are disposed opposite to each other, the control unit 111 is disposed on at least one of the first mounting surface and the second mounting surface, and the sensor elements 12 are arranged at intervals on the first mounting surface. The sensor elements 12 are placed at intervals on the same plane of the substrate 11, so that a plurality of sensor elements 12 are closely arranged, the space utilization rate on the substrate 11 is improved, the volume of the gas sensor 100 is reduced, the complexity and redundancy of the discrete design are reduced, the installation and maintenance costs of the system are reduced, and the gas sensor 100 is conveniently placed in electronic products with a small installation space, and the scalability and applicability of the gas sensor 100 are greatly improved.

[0048] Moreover, the integrated design reduces the number of components and connection lines, thereby reducing production costs. The miniaturization and lightweight design of the gas sensor 100 also reduces material costs and transportation costs.

[0049] For details, please refer to Figure 2 The substrate 11 further includes an airway wall 13 protruding from the first mounting surface. The airway wall 13 is disposed on the peripheral side of the plurality of sensor elements 12. The airway wall 13 and the first mounting surface enclose an airflow channel 131. The airway wall 13 can be formed integrally with the first mounting surface, further shortening the overall thickness of the gas sensor 100, reducing the volume of the gas sensor 100, and effectively improving the space utilization. The airway wall 13 can effectively guide the gas flow, so that the gas flow forms a streamlined atmosphere flow environment around the sensor element 12, thereby reducing the turbulence and resistance of the gas flow and improving the sensitivity and stability of the sensor element 12 to gas sensing.

[0050] In this embodiment, the sensing surface of each sensor element 12 is parallel to the first mounting surface. That is, the sensing surface of each sensor element 12 is arranged upward relative to the mounting surface. Under the condition of the spaced arrangement, the contact range between the sensor element 12 and the gas to be detected is larger. When the gas flows through the channel, the sensing surface of the sensor element 12 can be subjected to a more uniform airflow. This helps to ensure that the airflow received by each sensor element 12 is uniform, thereby improving the measurement accuracy and stability of the sensor element.

[0051] The distance between the sensing surface of each sensor element 12 and the first mounting surface is kept the same. This arrangement can reduce the differences between the components inside the sensor element. When the gas flows through the channel, the airflow effects on each sensor element 12 are similar, which helps to ensure that the airflow conditions on each sensor element 12 are consistent, thereby improving the measurement accuracy and reliability of the sensor element.

[0052] In order to power multiple electronic components in the gas sensor 100, the first mounting surface and the second mounting surface are both provided with multiple pins 18 arranged at intervals, and each pin 18 is electrically connected to the control unit 111 and each sensor element 12. The control unit 111 is electrically connected to the external power supply through the pin 18, and the power management program inside the control unit 111 controls the on-off circuits of multiple sensor elements 12, the first solenoid valve 14, the second solenoid valve 15 and the flow meter 16 respectively, realizing the unification of multi-parameter measurement and data processing, and improving the accuracy and consistency of the data. The test data can be communicated through the UART interface, or other communication methods, which are not limited here.

[0053] By distributing multiple pins 18 on the two mounting surfaces, power can be supplied to multiple electronic components in the gas sensor 100 more evenly, which helps to reduce the resistance and voltage drop of the power supply line, improves the power supply stability of each electronic component, and ensures that they can work normally. The distribution of multiple pins 18 can make the current more evenly distributed among different components. This helps to avoid overheating or damage of certain components due to excessive current density, and improves the overall reliability and life of the gas sensor 100.

[0054] At the same time, multiple pins 18 are provided and electrically connected to the control unit 111, which can provide greater flexibility and scalability for the gas sensor 100. By properly designing the layout and connection method of the pins 18, different types of electronic components can be easily added or replaced to meet the needs of different application scenarios. Distributing pins 18 on both mounting surfaces can improve the fault isolation capability of the gas sensor 100. If a pin 18 or connection on a mounting surface fails, the pin 18 on the other mounting surface can still continue to supply power, thereby reducing the risk of failure of the entire gas sensor 100 due to a single point failure.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas sensor, characterized in that: include: a base plate on which a control unit is mounted; A plurality of sensor elements are disposed on the substrate and are electrically connected to the control unit; An air flow channel is mounted on the substrate, each of the sensing elements is arranged in the air flow channel, and the air flow channel includes an air inlet and an air outlet; A regulating component, electrically connected to the control unit, the regulating component comprising a first solenoid valve and a second solenoid valve, the first solenoid valve being arranged at the air inlet, and the second solenoid valve being arranged at the air outlet; The gas sensor has an intake state and an exhaust state. When the gas sensor is in the intake state, the first solenoid valve is opened and the second solenoid valve is closed. When the gas sensor is in the exhaust state, the first solenoid valve is closed and the second solenoid valve is opened.

2. The gas sensor according to claim 1, characterized in that The regulating component also includes a flow meter, which is electrically connected to the control unit and is used to detect the gas flow entering the air flow channel. The flow meter and the first solenoid valve are arranged at intervals at the air inlet.

3. The gas sensor according to claim 1 or 2, characterized in that: A filter screen is arranged in the air inlet.

4. The gas sensor according to claim 2, characterized in that: The first solenoid valve and the air inlet together form an air inlet channel, the second solenoid valve and the air outlet together form an air outlet channel, and the volume of the air inlet channel is greater than the volume of the air outlet channel.

5. The gas sensor according to claim 4, characterized in that: The cross-sectional area of ​​the air inlet passage gradually increases along the direction from the air inlet to the first solenoid valve.

6. The gas sensor according to claim 4, characterized in that: A plurality of convex blocks are convexly arranged in the air inlet passage, and the convex blocks are arranged at intervals, and the convex block heights of two adjacent convex blocks are different.

7. The gas sensor according to claim 1, characterized in that: The substrate has a first mounting surface and a second mounting surface that are arranged opposite to each other, the control unit is arranged on at least one of the first mounting surface and the second mounting surface, and the sensor elements are arranged on the first mounting surface in an alternate manner.

8. The gas sensor according to claim 7, characterized in that: The substrate further includes an airway wall protruding from the first mounting surface, the airway wall being disposed on the peripheral side of the plurality of sensor elements, and the airway wall and the first mounting surface enclose the airway channel.

9. The gas sensor according to claim 8, characterized in that: The sensing surface of each of the sensing elements is parallel to the first mounting surface, and the distance between the sensing surface of each of the sensing elements and the first mounting surface remains the same.

10. The gas sensor according to claim 7, characterized in that: The first mounting surface and the second mounting surface are both provided with a plurality of pins arranged at intervals, and each of the pins is electrically connected to the control unit and each of the sensor elements accordingly.

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