Capacitive gas sensor and electronic device
By creating vent holes and air holes in the encapsulation shell and conductive electrode plate of the capacitive gas sensor, the problem of uneven gas entry is solved, achieving high sensitivity and accurate gas leak detection, reducing costs, and making it suitable for smart home and industrial automation control systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- GOERTEK MICROELECTRONICS CO LTD
- Filing Date
- 2024-12-09
- Publication Date
- 2026-06-09
AI Technical Summary
Existing capacitive gas sensors have unreasonable ventilation structure designs, which makes it difficult for gas to enter evenly, affecting sensitivity and accuracy. At the same time, the packaging structure is complex and costly.
Vent holes and air holes are respectively opened on the encapsulation shell, the first conductive electrode plate and the second conductive electrode plate to ensure that external gas can enter the gap cavity in a timely and smooth manner, and gas leakage detection is achieved by monitoring the change of capacitance value.
It improves detection sensitivity and accuracy, simplifies the structure, reduces manufacturing costs, and is suitable for gas leak monitoring in smart home and industrial automation control systems.
Smart Images
Figure CN122171632A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of electronic product technology, and more specifically, to a capacitive gas sensor and electronic device. Background Technology
[0002] Real-time monitoring of gas leaks is crucial in various fields, including industrial production, home security, and environmental monitoring. Traditional gas detection methods, such as chemical sensors and infrared sensors, while meeting some of the requirements, often suffer from high costs, slow response times, or complex maintenance. Therefore, developing a low-cost, highly sensitive, and easy-to-maintain gas sensor is of paramount importance.
[0003] Capacitive gas sensors, as a novel gas detection technology, have gradually gained widespread attention in the industry due to their advantages such as high sensitivity, fast response speed, and ease of integration. However, existing capacitive gas sensors still have some shortcomings in design and application. For example, some sensors have poorly designed ventilation structures, making it difficult for gas to enter the capacitor uniformly and efficiently, thus affecting the sensor's sensitivity and accuracy. In addition, some sensors have complex packaging structures, resulting in high manufacturing costs.
[0004] In view of this, a new technical solution is needed to at least solve one of the above-mentioned technical problems. Summary of the Invention
[0005] One objective of this application is to provide a new technical solution for a capacitive gas sensor and electronic device.
[0006] According to a first aspect of this application, a capacitive gas sensor is provided, the capacitive gas sensor comprising:
[0007] The encapsulation housing has at least one vent hole and an accommodating space is formed inside the encapsulation housing;
[0008] A first conductive electrode plate, wherein the first conductive electrode plate has at least one first air hole;
[0009] The second conductive electrode plate has at least one second air hole.
[0010] At least one of the first vent and the second vent is in communication with the vent hole;
[0011] The first conductive electrode plate and the second conductive electrode plate are disposed opposite to each other and spaced apart within the accommodating space; a gap cavity is provided between the first conductive electrode plate and the second conductive electrode plate; the first air hole and the second air hole are both connected to the gap cavity;
[0012] External gas can enter the gap cavity through the vent and the first and / or second vent, thereby changing the capacitance value of the capacitor formed by the first and second conductive electrode plates.
[0013] Optionally, the encapsulation housing includes a shell and a substrate, the shell and the substrate being interconnected and enclosing the accommodating space;
[0014] The vent includes a first vent and a second vent, the first vent being formed in the housing and the second vent being formed in the substrate.
[0015] Optionally, the first conductive electrode plate is connected to the housing, the second conductive electrode plate is spaced apart from the housing, and the second conductive electrode plate is positioned closer to the substrate than the first conductive electrode plate;
[0016] The first vent is connected to the first air hole, and the second vent and the second air hole are both connected to the accommodating space.
[0017] Optionally, the capacitive gas sensor further includes an insulating ring, which is disposed around the second conductive electrode plate between the housing.
[0018] Optionally, the housing includes a bottom wall and side walls connected to each other, the first vent is formed in the bottom wall, and the first conductive electrode plate is connected to the bottom wall.
[0019] Optionally, one end of the sidewall is connected to the bottom wall, and the other end of the sidewall is bent inward to form a flange structure, the flange structure being connected to the surface of the substrate facing away from the accommodating space.
[0020] Optionally, the capacitive gas sensor further includes a first conductive element disposed within the accommodating space, and the first conductive element is electrically connected to the substrate and the second conductive electrode plate.
[0021] Optionally, the capacitive gas sensor further includes a second conductive element, one end of which is electrically connected to the substrate, and the other end of which extends outside the accommodating space. The second conductive element is configured to be electrically connected to an external device.
[0022] Optionally, the capacitive gas sensor further includes a gasket sandwiched between the edge of the first conductive electrode plate and the edge of the second conductive electrode plate, with the gap cavity formed between the first conductive electrode plate and the second conductive electrode plate in the area outside the gasket.
[0023] According to a second aspect of this application, an electronic device is provided, the electronic device comprising a capacitive gas sensor as described in the first aspect.
[0024] The capacitive gas sensor provided in this application embodiment has at least one through hole structure in the encapsulation shell, the first conductive electrode plate and the second conductive electrode plate, so as to ensure that the external gas can enter the gap cavity formed between the first conductive electrode plate and the second conductive electrode plate in a timely and smooth manner, thereby the capacitive gas sensor has high detection sensitivity and accuracy.
[0025] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description
[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.
[0027] Figure 1 This is a cross-sectional structural schematic diagram of a capacitive gas sensor according to an embodiment of this application.
[0028] Explanation of reference numerals in the attached figures:
[0029] 1. Capacitive gas sensor; 11. Encapsulation housing; 110. Vent hole; 1101. First vent hole; 1102. Second vent hole; 101. Accommodation space; 102. Gap cavity; 111. Housing; 1111. Bottom wall; 1112. Side wall; 1110. Flanged structure; 112. Substrate; 12. First conductive electrode plate; 120. First vent hole; 13. Second conductive electrode plate; 130. Second vent hole; 14. Insulating ring; 15. First conductive element; 16. Second conductive element; 17. Gasket; 18. ASIC chip. Detailed Implementation
[0030] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present application.
[0031] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.
[0032] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.
[0033] In all the examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.
[0034] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.
[0035] Reference Figure 1 As shown, according to one embodiment of this application, a capacitive gas sensor 1 is provided. The capacitive gas sensor 1 includes a housing 11, a first conductive electrode plate 12, and a second conductive electrode plate 13. The housing 11 has at least one vent hole 110 and a receiving space 101 is formed inside the housing 11. The first conductive electrode plate 12 has at least one first vent hole 120. The second conductive electrode plate 13 has at least one second vent hole 130. At least one of the first vent hole 120 and the second vent hole 130 communicates with the vent hole 110. The first conductive electrode plate 12 and the second conductive electrode plate 13 are disposed opposite to each other and spaced apart in the receiving space 101. A gap cavity 102 is provided between the first conductive electrode plate 12 and the second conductive electrode plate 13. Both the first vent hole 120 and the second vent hole 130 communicate with the gap cavity 102.
[0036] External gas can enter the gap cavity 102 through the vent 110 and the first vent 120 and / or the second vent 130, thereby changing the capacitance value of the capacitor formed by the first conductive electrode plate 12 and the second conductive electrode plate 13.
[0037] In the capacitive gas sensor 1 provided in this application embodiment, a vent 110 in the encapsulation housing 11 allows external gas to enter the gap cavity 102 formed by the first conductive electrode plate 12 and the second conductive electrode plate 13. The first conductive electrode plate 12 and the second conductive electrode plate 13 are arranged opposite to each other and spaced apart, forming a capacitor structure. If no gas leakage occurs, only air exists in the gap cavity 102. When a gas leakage occurs, the leaking gas first enters the gap cavity 102 through the vent 110 and then through the first vent 120 and / or the second vent 130. Since the dielectric constant of the leaking gas is different from that of air, when the gas composition in the gap cavity 102 changes, the capacitance value of the capacitor formed by the first conductive electrode plate 12 and the second conductive electrode plate 13 changes. By monitoring the change in capacitance value, gas leakage can be detected; the detected content includes, but is not limited to, the concentration and type of the leaking gas.
[0038] Specifically, if the first vent 120 is connected to the vent 110, the leaked gas enters the gap cavity 102 through the vent 110 and then through the first vent 120; if the second vent 130 is connected to the vent 110, the leaked gas enters the gap cavity 102 through the vent 110 and then through the second vent 130; if both the first vent 120 and the second vent 130 are connected to the vent 110, the leaked gas enters the gap cavity 102 through the vent 110 and then through the first vent 120 and the second vent 130.
[0039] The capacitive gas sensor 1 provided in this application embodiment has at least one through hole structure in the encapsulation shell 11, the first conductive electrode plate 12 and the second conductive electrode plate 13, respectively, to ensure that external gas can enter the gap cavity 102 formed between the first conductive electrode plate 12 and the second conductive electrode plate 13 in a timely and smooth manner, so that the capacitive gas sensor 1 has high detection sensitivity and accuracy.
[0040] Reference Figure 1 As shown, in one embodiment, the encapsulation housing 11 includes a housing 111 and a substrate 112, the housing 111 and the substrate 112 being interconnected and enclosing the accommodating space 101;
[0041] The vent 110 includes a first vent 1101 and a second vent 1102. The first vent 1101 is formed in the housing 111, and the second vent 1102 is formed in the substrate 112.
[0042] In this specific example, the encapsulation housing 11 specifically includes a housing 111 and a substrate 112, which are connected to each other and enclose a receiving space 101. The housing 111 and the substrate 112 can be connected by welding, threaded connection, or other fastening methods. The vent 110 includes a first vent 1101 and a second vent 1102, wherein the first vent 1101 is formed on the housing 111, and the second vent 1102 is formed on the substrate 112. This helps to introduce external gas more evenly and in a timely manner. If a gas leak occurs, the leaking gas source, whether closer to the housing 111 or closer to the substrate 112, can enter the gap cavity 102 in a timely manner, thereby further improving the detection sensitivity and accuracy of the capacitive gas sensor 1.
[0043] Reference Figure 1 As shown, in one embodiment, the first conductive electrode plate 12 is connected to the housing 111, the second conductive electrode plate 13 is spaced apart from the housing 111, and the second conductive electrode plate 13 is disposed closer to the substrate 112 than the first conductive electrode plate 12;
[0044] The first vent 1101 is connected to the first vent 120, and the second vent 1102 and the second vent 130 are both connected to the accommodating space 101.
[0045] In this specific example, the first conductive electrode plate 12 is connected to the housing 111. The first vent hole 1101 on the housing 111 is connected to the first vent hole 120 on the first conductive electrode plate 12. External gas can directly enter the gap cavity 102 through the first vent hole 1101 and the first vent hole 120. The second conductive electrode plate 13 is located closer to the substrate 112 than the first conductive electrode plate 12. The second vent hole 130 on the second conductive electrode plate 13 and the second vent hole 1102 on the substrate 112 are both connected to the accommodating space 101. In this way, external gas can first enter the accommodating space 101 through the second vent hole 1102, and then enter the gap cavity 102 through the second vent hole 130.
[0046] Reference Figure 1 As shown, in one embodiment, the capacitive gas sensor further includes an insulating ring 14, which is disposed around the second conductive electrode plate 13 and the housing 111.
[0047] In this specific example, in order to ensure electrical isolation between the first conductive electrode plate 12 and the second conductive electrode plate 13 and to prevent the first conductive electrode plate 12 and the second conductive electrode plate 13 from becoming conductive through the housing 111 and thus failing to form a capacitor structure, an insulating ring 14 is provided in the capacitive gas sensor 1; the insulating ring 14 is arranged around the second conductive electrode plate 13 and the housing 111, effectively preventing the possibility of contact between the second conductive electrode plate 13 and the housing 111.
[0048] Reference Figure 1 As shown, in one embodiment, the housing 111 includes a bottom wall 1111 and a side wall 1112 connected to each other, the first vent 1101 is formed in the bottom wall 1111, and the first conductive electrode plate 12 is connected to the bottom wall 1111.
[0049] In this specific example, the housing 111 has an approximately box-like structure, which includes a bottom wall 1111 and a side wall 1112 connected to each other. The first conductive electrode plate 12 is stacked on the bottom wall 1111, and the first vent hole 1101, which communicates with the first vent hole 120 opened on the first conductive electrode plate 12, is opened on the bottom wall 1111. The capacitive gas sensor 1 has a relatively simple structure and a high degree of integration.
[0050] Reference Figure 1As shown, in one embodiment, one end of the sidewall 1112 is connected to the bottom wall 1111, and the other end of the sidewall 1112 is bent inward to form a flange structure 1110. The flange structure 1110 is connected to the surface of the substrate 112 that is away from the accommodating space 101.
[0051] In this specific example, one end of the sidewall 1112 is connected to the bottom wall 1111, and the other end of the sidewall 1112 is provided with a flange structure 1110, which is connected to the surface of the substrate 112 facing away from the accommodating space 101. This ensures a reliable connection between the housing 111 and the substrate 112 while simplifying the structure and packaging process of the capacitive gas sensor 1. The bottom wall 1111, sidewall 1112, and flange structure 1110 are an integral structure, resulting in high reliability of the housing 111.
[0052] Reference Figure 1 As shown, in one embodiment, the capacitive gas sensor further includes a first conductive element 15, which is disposed within the accommodating space 101 and is electrically connected to the substrate 112 and the second conductive electrode plate 13.
[0053] In this specific example, an electrical connection between the substrate 112 and the second conductive electrode plate 13 is achieved by setting a first conductive element 15. The substrate 112 is a PCB board, and an ASIC chip 18 is connected to the surface of the substrate 112 located in the accommodating space 101. The ASIC chip 18 is capable of amplifying and further processing electrical signals.
[0054] Reference Figure 1 As shown, in one embodiment, the capacitive gas sensor further includes a second conductive element 16, one end of which is electrically connected to the substrate 112, and the other end of which extends outside the accommodating space 101. The second conductive element 16 is configured to be electrically connected to an external device.
[0055] In this specific example, by providing a second conductive element 16, it is made easier for the capacitive gas sensor 1 to be connected to an external device. For example, the capacitive gas sensor 1 can be connected to the external device in the form of a rivet or a pin, thereby making the assembly of the capacitive gas sensor 1 in the whole machine more convenient.
[0056] Reference Figure 1 As shown, in one embodiment, the capacitive gas sensor further includes a gasket 17, which is sandwiched between the edge of the first conductive electrode plate 12 and the edge of the second conductive electrode plate 13, and the gap cavity 102 is formed between the first conductive electrode plate 12 and the second conductive electrode plate 13 in the area outside the gasket 17.
[0057] In this specific example, by providing a shim 17 between the edge of the first conductive electrode plate 12 and the edge of the second conductive electrode plate 13, the uniformity of the gap cavity 102 formed between the first conductive electrode plate 12 and the second conductive electrode plate 13 is further ensured.
[0058] In summary, the capacitive gas sensor provided in this application has advantages such as simple structure, high sensitivity, and fast response speed, and can achieve accurate monitoring of gas leaks, thus having broad application prospects.
[0059] According to another embodiment of this application, an electronic device is provided, the electronic device including the capacitive gas sensor 1 as described above.
[0060] The electronic device provided in this application can be used in various electronic devices that require gas leak monitoring, such as smart home systems and industrial automation control systems. By connecting the capacitive gas sensor to the control system of the electronic device, real-time monitoring and alarm of gas leaks can be achieved, improving the safety and reliability of the equipment.
[0061] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.
[0062] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.
Claims
1. A capacitive gas sensor, characterized in that, The capacitive gas sensor includes: The encapsulation housing (11) has at least one vent hole (110) and an accommodating space (101) is formed inside the encapsulation housing (11); The first conductive electrode plate (12) has at least one first air hole (120); The second conductive electrode plate (13) has at least one second vent (130); At least one of the first vent (120) and the second vent (130) is in communication with the vent (110); The first conductive electrode plate (12) and the second conductive electrode plate (13) are opposite to each other and spaced apart in the accommodating space (101); a gap cavity (102) is provided between the first conductive electrode plate (12) and the second conductive electrode plate (13); the first air hole (120) and the second air hole (130) are both connected to the gap cavity (102); External gas can enter the gap cavity (102) through the vent (110) and the first vent (120) and / or the second vent (130) to change the capacitance value of the capacitor formed by the first conductive electrode plate (12) and the second conductive electrode plate (13).
2. The capacitive gas sensor according to claim 1, characterized in that, The encapsulation housing (11) includes a housing (111) and a substrate (112), wherein the housing (111) and the substrate (112) are connected to each other and enclose the accommodating space (101); The vent (110) includes a first vent (1101) and a second vent (1102), the first vent (1101) being formed in the housing (111) and the second vent (1102) being formed in the substrate (112).
3. The capacitive gas sensor according to claim 2, characterized in that, The first conductive electrode plate (12) is connected to the housing (111), and the second conductive electrode plate (13) is spaced apart from the housing (111), and the second conductive electrode plate (13) is positioned closer to the substrate (112) than the first conductive electrode plate (12); The first vent (1101) is connected to the first air hole (120), and the second vent (1102) and the second air hole (130) are both connected to the accommodating space (101).
4. The capacitive gas sensor according to claim 3, characterized in that, The capacitive gas sensor also includes an insulating ring (14), which is disposed around the second conductive electrode plate (13) between the housing (111).
5. The capacitive gas sensor according to claim 3, characterized in that, The housing (111) includes a bottom wall (1111) and a side wall (1112) connected to each other. The first vent (1101) is opened in the bottom wall (1111), and the first conductive electrode plate (12) is connected to the bottom wall (1111).
6. The capacitive gas sensor according to claim 5, characterized in that, One end of the sidewall (1112) is connected to the bottom wall (1111), and the other end of the sidewall (1112) is bent inward to form a flange structure (1110). The flange structure (1110) is connected to the surface of the substrate (112) that is away from the accommodating space (101).
7. The capacitive gas sensor according to claim 2, characterized in that, The capacitive gas sensor further includes a first conductive element (15), which is disposed in the accommodating space (101) and is electrically connected to the substrate (112) and the second conductive electrode plate (13).
8. The capacitive gas sensor according to claim 2, characterized in that, The capacitive gas sensor further includes a second conductive element (16), one end of which is electrically connected to the substrate (112), and the other end of which extends outside the accommodating space (101). The second conductive element (16) is configured to be electrically connected to an external device.
9. The capacitive gas sensor according to any one of claims 1-8, characterized in that, The capacitive gas sensor also includes a gasket (17) sandwiched between the edge of the first conductive electrode plate (12) and the edge of the second conductive electrode plate (13), and the gap cavity (102) is formed between the first conductive electrode plate (12) and the second conductive electrode plate (13) in the area outside the gasket (17).
10. An electronic device, characterized in that, The electronic device includes a capacitive gas sensor (1) as described in any one of claims 1-9.