A gas collection cover for a gas sensor module

Abstract

This invention provides a gas collection cover for a gas sensor module, comprising a cylindrical gas collection cover body. The first end of the gas collection cover body is open and serves as a connecting end, which has a connecting portion. The second end of the gas collection cover body has an inwardly concave arc-shaped structure forming a cover. The inner end of the cover has an annular protrusion coaxial with the gas collection cover body, which divides the interior of the gas collection cover body into an interconnected inner and outer region. A first air inlet hole communicating with the inner region and a second air inlet hole communicating with the outer region are passed through the cover. The distance from the second air inlet hole to the axis of the gas collection cover body is greater than the distance from the first air inlet hole to the axis of the gas collection cover body. A water baffle is provided within the inner region, located on the extension line of the outlet end of the first air inlet hole. This gas collection cover for a gas sensor module is compact, lightweight, low-cost, has good gas collection effect, and good rainproof performance.

Description

Technical Field

[0001] This utility model relates to a sensor, and more particularly to a gas collection cover for a gas sensor module. Background Technology

[0002] In industrial production, gas alarm sensor modules typically require a gas collection hood. Some manufacturers currently use stainless steel (such as 316 or 304 stainless steel) or polytetrafluoroethylene (PTFE) and manufacture the hood using machining processes. While these materials effectively prevent adsorption and significantly improve sensor accuracy, this design drastically increases costs, by at least tens of times. Furthermore, limitations in machining processes often restrict the product's shape, affecting the hood's rainproof performance and significantly reducing its overall performance in practical applications, thus diminishing its market competitiveness.

[0003] In short, existing gas collection hood designs have many shortcomings, and a new solution is urgently needed to improve detection accuracy and product market competitiveness. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a gas collection hood that is compact in structure, low in manufacturing cost, and has good rainproof and anti-adsorption properties.

[0005] This utility model provides a gas collection cover for a gas sensor module, including a cylindrical gas collection cover body. The first end of the gas collection cover body is open and serves as a connecting end, and the connecting end is provided with a connecting part 111. The second end of the gas collection cover body is provided with an inwardly concave arc-shaped structure to form a cover body 13. The inner end of the cover body 13 is provided with an annular protrusion 14 coaxial with the gas collection cover body. The annular protrusion 14 divides the interior of the gas collection cover body into an inner area and an outer area that are interconnected. The cover body 13 has a first air inlet hole 101 communicating with the inner area and a second air inlet hole 102 communicating with the outer area. The distance from the second air inlet hole 102 to the axis of the gas collection cover body is greater than the distance from the first air inlet hole to the axis of the gas collection cover body. A baffle plate 161 is provided in the inner area. The baffle plate 161 is located on the extension line of the air outlet end of the first air inlet hole 101.

[0006] This application provides a baffle plate on the extended line (axis) of the outlet end of the first air inlet. When liquid is injected directly from the first air inlet, it will be physically blocked and splashed by the baffle plate, effectively preventing the liquid from directly impacting and damaging the internal precision sensor components, thus improving the reliability and service life of the module in humid environments. The arc-shaped cover and the internal annular protrusion together form an optimized airflow channel. The arc-shaped cover provides a gas inlet interface, which can guide the airflow smoothly and evenly into the first and second air inlets, while the annular protrusion plays a role in diverting and stabilizing the airflow, improving the uniformity of gas flow and avoiding detection errors caused by airflow turbulence. The cover has two air inlets. The first air inlet is located closer to the axis, collecting gas samples from the nearby area. The second air inlet is located farther from the axis, collecting gas samples from the distant area. Overall, this structure can effectively collect gas samples from multiple areas. At the same time, since the first air inlet is closer to the sensor module, the baffle plate prevents liquid from directly impacting the sensor.

[0007] Furthermore, the baffle plate 161 is annular and coaxial with the gas collection hood body.

[0008] Furthermore, the edge of the cover 13 is provided with a plurality of slots 103 for mounting accessories.

[0009] Furthermore, the gas collection hood body includes an inner cylinder 11 and an outer cylinder 12 coaxially arranged. The length of the outer cylinder 12 is less than the length of the inner cylinder 11. There is a gap between the inner cylinder 11 and the outer cylinder 12 to form an air passage. The connecting end is located at the first end of the inner cylinder 11. The hood 13 is located at the second end of the inner cylinder 11. The edge of the hood 13 extends outward and connects to the outer cylinder 12. The slot 103 is located between the inner cylinder 11 and the outer cylinder 12 and communicates with the air passage and the interior of the inner cylinder 11.

[0010] Furthermore, the end of the air passage is open and serves as an exhaust end, and the exhaust end is provided with a plurality of connecting plates 17 for connecting the inner cylinder 11 and the outer cylinder.

[0011] Furthermore, there are multiple first air inlets 101 and / or second air inlets 102, which are evenly distributed circumferentially around the axis of the air collection hood body.

[0012] Furthermore, the connecting part is an internal thread or an external thread.

[0013] Furthermore, the end of the annular protrusion 14 is provided with multiple protrusions to form a support portion 141, and there is a gap between two adjacent support portions 141 to form a connecting hole.

[0014] Furthermore, the cross-sectional area of ​​the first air inlet 101 is larger than the cross-sectional area of ​​the second air inlet 102.

[0015] Furthermore, the cross-section of the first air inlet 101 is arc-shaped.

[0016] Furthermore, the axes of the first air inlet 101 and / or the second air inlet 102 are parallel to the axis of the air collection hood body.

[0017] Furthermore, the surfaces of the inner region, the outer region, and the cover 13 are polished surfaces.

[0018] Furthermore, the gas collection hood is injection molded from PFA material.

[0019] This utility model relates to a gas collection cover for gas sensor modules. It features a compact structure, light weight, low manufacturing cost, good gas collection effect, good rainproof performance, and excellent anti-adsorption properties, ensuring the authenticity and accuracy of gas detection. It is suitable for gas detection needs in complex environments, effectively improving detection efficiency and stability while reducing maintenance frequency and operating costs, providing a reliable guarantee for industrial safety monitoring and environmental analysis. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the gas collection cover used in the gas sensor module of this utility model;

[0021] Figure 2 This is a schematic diagram of the gas collection cover of the present invention used in a gas sensor module from another angle.

[0022] Figure 3 This is a first planar sectional view of the gas collection hood for the gas sensor module of this utility model;

[0023] Figure 4 This is a second planar sectional view of the gas collection hood for the gas sensor module of this utility model;

[0024] Figure 5 This is a third planar sectional view of the gas collection hood used in the gas sensor module of this utility model. Detailed Implementation

[0025] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0026] See Figures 1-5This utility model provides a gas collection cover for a gas sensor module, installed at the lower part of the gas sensor module. The gas collection cover body is cylindrical, with an open first end serving as a connection end. A connection part 111 is provided at this connection end. In this embodiment, the connection part 111 is an internal or external thread, which facilitates installation and provides good sealing. The second end of the gas collection cover body has an inwardly concave arc-shaped structure, forming a cover body 13. The cover body 13 has an inwardly concave arc-shaped surface 1a (spherical surface). An annular protrusion 14 is provided on the inner end of the cover body 13 (i.e., the end facing away from the arc-shaped surface). 4. Coaxial with the main body of the gas collection hood, the annular protrusion 14 divides the interior of the main body of the gas collection hood into an inner area and an outer area, and the first end (near the connecting part) of the inner area and the outer area are connected; a first air inlet 101 and a second air inlet 102 are passed through the hood body 13, wherein the first air inlet 101 is connected to the inner area and the second air inlet 102 is connected to the outer area, and the distance from the second air inlet 102 to the axis of the main body of the gas collection hood is greater than the distance from the first air inlet to the axis of the main body of the gas collection hood; at the same time, a baffle plate 161 is provided in the inner area, and the baffle plate 161 is located on the extension line of the air outlet end of the first air inlet 101. This application provides a baffle plate on the extended line (axis) of the outlet end of the first air inlet. When liquid is injected directly from the first air inlet, it will be physically blocked and splashed by the baffle plate, effectively preventing the liquid from directly impacting and damaging the internal precision sensor components, thus improving the reliability and service life of the module in humid environments. The arc-shaped cover and the internal annular protrusion together form an optimized airflow channel. The arc-shaped cover provides a gas inlet interface, which can guide the airflow smoothly and evenly into the first and second air inlets, while the annular protrusion plays a role in diverting and stabilizing the airflow, improving the uniformity of gas flow and avoiding detection errors caused by airflow turbulence. The cover has two air inlets. The first air inlet is located closer to the axis, collecting gas samples from the nearby area. The second air inlet is located farther from the axis, collecting gas samples from the distant area. Overall, this structure can effectively collect gas samples from multiple areas. At the same time, since the first air inlet is closer to the sensor module, the baffle plate prevents liquid from directly impacting the sensor.

[0027] In this application, the baffle plate 161 is annular, specifically circular, and is coaxial with the gas collection hood body. It has good structural symmetry, effectively reduces the airflow speed, and allows the gas to flow very smoothly and evenly towards the sensor in the center, rather than directly rushing towards the sensor, thereby improving detection stability and accuracy.

[0028] To meet different operating conditions, this application provides multiple slots 103 along the edge of the cover 13. These slots 103 are used to install accessories, transforming the gas collection cover from a fixed-function component into a modular platform. Different functional accessories can be flexibly installed according to different application scenarios and environmental requirements without replacing the entire gas collection cover. Typically, the slot 103 is used to connect to a gas pipe, enabling the active introduction of the gas to be detected. In this embodiment, the gas collection cover body includes an inner cylinder 11 and an outer cylinder 12 arranged coaxially, with the inner cylinder located inside the outer cylinder. The length of the outer cylinder 12 is less than the length of the inner cylinder 11. A gap exists between the inner cylinder 11 and the outer cylinder 12, forming a gas passage. The connecting end is located at the first end of the inner cylinder 11, and the cover 13 is located at the second end of the inner cylinder 11. The edge of the cover 13 extends outward and connects to the outer cylinder 12, realizing the connection between the inner and outer cylinders. The fixed connection includes multiple slots 103 evenly distributed circumferentially, located between the inner cylinder 11 and the outer cylinder 12, and connecting the air passage and the interior of the inner cylinder 11. These slots 103 serve as interfaces for installing accessories; their double-cylinder design enhances both overall structural strength and connection strength. They also form an air inlet, allowing airflow to enter and be detected, improving intake efficiency and detection accuracy. The end of the air passage (near the connection) is open and serves as an exhaust end, equipped with multiple connecting plates 17 for connecting the inner cylinder 11 and the outer cylinder. In this embodiment, the connecting plates 17 are evenly distributed circumferentially. The open end of the air passage allows airflow to enter from the slots 103 and exit from the open end, allowing some gas to enter the detection area. This improves airflow smoothness, reduces internal pressure buildup, and further enhances the accuracy and response speed of gas detection.

[0029] In this application, there are multiple first air inlets 101 and second air inlets 102, which are evenly distributed around the axis of the gas collection hood body, preferably 3-4. This can improve the air intake volume and the uniformity of air intake, so that the gas can be more evenly distributed around the sensor, thereby improving the sensitivity and accuracy of detection. The axes of the first air inlets 101 and the second air inlets 102 are parallel to the axis of the gas collection hood body, which can make the airflow smoother and more direct into the interior.

[0030] In this embodiment, the cross-sectional area of ​​the first air inlet 101 is larger than that of the second air inlet 102. The first air inlet is closer to the center. Due to its larger cross-sectional area, the first air inlet will bear most of the air intake. Under the same pressure difference, the larger the aperture, the lower the flow velocity, and the larger the flow rate, thereby ensuring that the gas can enter the interior quickly and evenly, improving the stability and accuracy of the detection. The second air inlet is arranged far from the center. Its cross-sectional area is smaller. The smaller the aperture, the higher the flow velocity, and the smaller the flow rate. The relatively high flow velocity helps to disturb the local airflow, making the gas mixing more uniform, thereby further improving the sensitivity and accuracy of the detection. The cross-section of the first air inlet 101 is arc-shaped and arranged coaxially, which can achieve a more efficient air intake area in a limited space.

[0031] Multiple protrusions are provided at the end of the annular protrusion 14 to form a support portion 141. There is a gap between two adjacent support portions 141 to form a connecting hole. The support portion is used to support other components (such as explosion-proof sheets) in the sensor module. The connecting hole between adjacent protrusions can achieve support while allowing the inner and outer cylinders to communicate with each other, so that the gas in the outer zone can smoothly enter the inner zone. In this embodiment, multiple protrusions are evenly distributed circumferentially to improve the uniformity of air intake.

[0032] To improve anti-adsorption properties, the surfaces of the inner area, outer area, and cover 13 in this application are polished, i.e., the surfaces are smoothed to reduce the probability of gas adhesion to the surface, thereby improving anti-adsorption performance and enhancing the sensor response speed in the module when detecting adsorbent gases (such as ammonia and chlorine). The polished surfaces are located on the gas path, i.e., on the gas path.

[0033] In this application, the gas collection hood is injection molded from PFA material, which greatly reduces the product weight and production cost compared to stainless steel structures, while also providing good anti-adsorption performance.

[0034] This utility model relates to a gas collection cover for gas sensor modules. It features a compact structure, light weight, low manufacturing cost, good gas collection effect, good rainproof performance, and excellent anti-adsorption properties, ensuring the authenticity and accuracy of gas detection. It is suitable for gas detection needs in complex environments, effectively improving detection efficiency and stability while reducing maintenance frequency and operating costs, providing a reliable guarantee for industrial safety monitoring and environmental analysis.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A gas collection hood for a gas sensor module, characterized in that: The device includes a cylindrical gas collection hood body. The first end of the gas collection hood body is open and serves as a connecting end, which has a connecting portion. The second end of the gas collection hood body has an inwardly concave arc-shaped structure forming a hood. The inner end of the hood body has an annular protrusion coaxial with the gas collection hood body, which divides the interior of the gas collection hood body into an interconnected inner and outer region. The hood body has a first air inlet hole communicating with the inner region and a second air inlet hole communicating with the outer region. The distance from the second air inlet hole to the axis of the gas collection hood body is greater than the distance from the first air inlet hole to the axis of the gas collection hood body. A baffle plate is provided within the inner region, and the baffle plate is located on the extension line of the outlet end of the first air inlet hole.

2. The gas collection hood for a gas sensor module as described in claim 1, characterized in that: The water baffle is annular and coaxial with the gas collection hood body.

3. The gas collection hood for a gas sensor module as described in claim 1, characterized in that: The edge of the cover is provided with multiple slots for mounting accessories.

4. The gas collection hood for a gas sensor module as described in claim 3, characterized in that: The gas collection hood body includes an inner cylinder and an outer cylinder arranged coaxially. The length of the outer cylinder is less than the length of the inner cylinder. There is a gap between the inner cylinder and the outer cylinder to form an air passage. The connecting end is located at the first end of the inner cylinder. The hood is located at the second end of the inner cylinder. The edge of the hood extends outward and connects to the outer cylinder. The slot is located between the inner cylinder and the outer cylinder and communicates with the air passage and the interior of the inner cylinder.

5. The gas collection hood for a gas sensor module as described in claim 4, characterized in that: The end of the air passage is open and serves as the exhaust end, which is provided with multiple connecting plates for connecting the inner cylinder and the outer cylinder.

6. The gas collection hood for a gas sensor module as described in claim 1, characterized in that: The first air inlet and / or the second air inlet are multiple and are evenly distributed circumferentially around the axis of the air collection hood body.

7. The gas collection hood for a gas sensor module as described in claim 1, characterized in that: The end of the annular protrusion has multiple protrusions that form a support portion, and there is a gap between two adjacent support portions to form a connecting hole.

8. The gas collection hood for a gas sensor module as described in claim 1, characterized in that: The cross-sectional area of ​​the first air inlet is larger than that of the second air inlet.

9. The gas collection hood for a gas sensor module as described in claim 1, characterized in that: The surfaces of the inner area, the outer area, and the cover are polished.

10. The gas collection hood for a gas sensor module as described in any one of claims 1-9, characterized in that: The gas collection hood is injection molded from PFA material.

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