Gas detector and air inlet structure thereof
By using a multi-stage deceleration and diffusion structure, the problem of diffusion gas detectors being easily affected by wind speed is solved, and the airflow is stably and uniformly diffused to the sensor surface, ensuring the stability and accuracy of the detection values.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 河南省保时安科技股份有限公司
- Filing Date
- 2025-05-29
- Publication Date
- 2026-05-29
AI Technical Summary
Existing diffusion-type gas detectors are susceptible to the influence of ambient wind speed, which can lead to excessively high airflow speeds and turbulence, resulting in fluctuations or distortions in the detected values.
The system employs a multi-stage deceleration and diffusion structure, including a flow guide, a gas dispersion net, a conical cylinder, and a diffuser plate. By buffering and dispersing the airflow in stages, it ensures that the gas diffuses evenly to the sensor surface.
This effectively avoids turbulence on the sensor surface, ensuring the stability and accuracy of the detected values, especially with the airflow velocity remaining stable at 0.2-0.8 m/s at a wind speed of 10 m/s.
Smart Images
Figure CN224303663U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gas detectors, specifically to a gas detector and its air intake structure. Background Technology
[0002] A gas detector is an instrument used to detect gas concentrations. This instrument is suitable for hazardous locations where flammable or toxic gases are present, and can continuously monitor the concentration of the gas in the air up to its lower explosive limit. It can be widely used in various industries where flammable or toxic gases are present, such as gas, petrochemical, metallurgy, steel, coking, and power generation.
[0003] Pump-suction gas detectors and diffusion gas detectors are two common detection methods. Pump-suction detectors use active sampling, employing a built-in small gas sampling pump to actively extract gas samples from the area to be tested and deliver them into the detector for detection. The disadvantages are complex structure, high manufacturing cost, and high maintenance costs. Diffusion detectors use passive sampling, relying on the natural diffusion of gas molecules to slowly introduce the gas to be tested into the detector for detection. Although diffusion gas detectors are simple in structure and low in cost, they are significantly affected by ambient wind speed. When the airflow velocity diffusing to the sensor surface inside the detector is too high, turbulence can form, leading to fluctuations or distortion in the detected values. Utility Model Content
[0004] The purpose of this invention is to provide an air intake structure for a gas detector to solve the aforementioned technical problems in the prior art; at the same time, the purpose of this invention is also to provide a gas detector using the aforementioned air intake structure.
[0005] To achieve the above objectives, the present invention provides a gas detector with an air intake structure, which employs the following technical solution: An air intake structure for a gas detector includes a flow guide shroud. The flow guide shroud has an installation cavity and an air inlet communicating with the installation cavity. A gas dispersion net is disposed in the installation cavity, directly opposite the air inlet, and the gas dispersion net is densely covered with multiple gas dispersion holes. A gas diffusion structure is disposed on the other side of the split dispersion net in the installation cavity. The gas diffusion structure is hourglass-shaped and includes a first conical cylinder and a second conical cylinder. The small ends of the first and second conical cylinders are positioned opposite each other, and the gas diffusion structure has a central air hole connecting the small ends of the first and second conical cylinders. The large end of the first conical cylinder faces the gas dispersion net to allow gas to enter, and the large end of the second conical cylinder faces the gas sensor inside the gas detector to allow gas to diffuse to the surface of the gas sensor.
[0006] The large end of the second conical cylinder is provided with a diffuser plate, which is densely covered with multiple micropores.
[0007] The pore size of the micropores is 0.1-0.3 mm.
[0008] The diffuser plate is made of a honeycomb ceramic substrate.
[0009] A waterproof and breathable membrane is provided between the large end of the first conical cylinder and the gas dispersion net.
[0010] The gas dispersion holes on the gas dispersion net are conical holes, with the larger end of the conical hole facing the air inlet.
[0011] The slope of the tapered hole is 30-45°.
[0012] The diameter of the small end of the gas dispersion hole is 0.5-1 mm.
[0013] The porosity of the gas dispersion mesh is greater than or equal to 60%.
[0014] The present invention discloses a gas detector using the following technical solution: A gas detector includes a housing, inside which a gas sensor is disposed. An air inlet structure is disposed on the housing corresponding to the gas sensor. The air inlet structure includes a flow guide shroud with a mounting cavity. An air inlet communicating with the mounting cavity is disposed on the flow guide shroud. A gas dispersion net is disposed in the mounting cavity, directly opposite the air inlet, and the gas dispersion net is densely covered with multiple gas dispersion holes. A gas diffusion structure, shaped like an hourglass, is disposed on the other side of the dispersion net in the mounting cavity. The gas diffusion structure includes a first conical cylinder and a second conical cylinder. The small ends of the first and second conical cylinders are positioned opposite each other, and the gas diffusion structure has a central air hole connecting the small ends of the first and second conical cylinders. The large end of the first conical cylinder faces the gas dispersion net to allow gas to enter, and the large end of the second conical cylinder faces the gas sensor inside the gas detector to allow gas to diffuse to the surface of the gas sensor.
[0015] The large end of the second conical cylinder is provided with a diffuser plate, which is densely covered with multiple micropores.
[0016] The pore size of the micropores is 0.1-0.3 mm.
[0017] The diffuser plate is made of a honeycomb ceramic substrate.
[0018] A waterproof and breathable membrane is provided between the large end of the first conical cylinder and the gas dispersion net.
[0019] The gas dispersion holes on the gas dispersion net are conical holes, with the larger end of the conical hole facing the air inlet.
[0020] The slope of the tapered hole is 30-45°.
[0021] The diameter of the small end of the gas dispersion hole is 0.5-1 mm.
[0022] The porosity of the gas dispersion mesh is greater than or equal to 60%.
[0023] The beneficial effects of this invention are as follows: Gas enters through the air inlet on the guide shroud, and is dispersed and buffered by the gas dispersion holes on the gas dispersion net, splitting the high-speed airflow into a low-speed airflow. Then, the gas enters the first conical cylinder, where it is concentrated and gathered through the central air hole, and then enters the second conical cylinder where it is further dispersed and reduced in flow. The gas diffusion structure enables more uniform gas dispersion, and finally, the uniformly dispersed gas diffuses onto the surface of the gas sensor. This step-by-step buffering and dispersion of the gas avoids turbulence on the gas sensor surface, solving the technical problem of fluctuations or distortions in detection values caused by turbulence when the airflow velocity is too high when diffusing to the sensor surface inside the detector. Attached Figure Description
[0024] Figure 1 This is a schematic diagram of the structure of one embodiment of a gas detector according to the present invention;
[0025] Figure 2 yes Figure 1 Schematic diagram of the internal structure of the gas detector;
[0026] Figure 3 yes Figure 2 A magnified view of a section at point A in the middle;
[0027] Figure 4 yes Figure 2 Schematic diagram of the gas diffusion network in the middle;
[0028] Figure 5 yes Figure 2 A schematic diagram of the gas diffusion structure. Detailed Implementation
[0029] To facilitate understanding of this utility model, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. The accompanying drawings show preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.
[0030] It should be noted that, unless otherwise defined, the technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The use of "belonging" in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of this invention.
[0031] An embodiment of the gas detector of this utility model, such as... Figures 1-5As shown, the device includes a housing 1, on which a display screen 2, buttons 3, and a fixing clip 4 are mounted. A gas sensor 6 is disposed inside the housing, and an air intake structure corresponding to the gas sensor is also disposed on the housing. All of the above are existing technologies, and the specific structures and working principles described herein will not be detailed in this embodiment. The air intake structure includes a flow guide 5, which has a mounting cavity. An air intake 7 communicating with the mounting cavity is disposed on the flow guide 5. In this embodiment, the air intake 7 is an elongated air intake, and there are three such intakes. In other embodiments, the shape and number of air intakes 7 can be adjusted according to actual needs.
[0032] A gas dispersion mesh 8, made of metal mesh, is installed in the mounting cavity of the air guide shroud 5, directly opposite the air inlet 7. The gas dispersion mesh 8 has numerous gas dispersion holes 14. In this embodiment, the gas dispersion holes 14 on the gas dispersion mesh are conical, with the larger end of the conical hole facing the air inlet. The slope of the conical hole is 30-45°, meaning the angle between the conical surface of the conical hole and its central axis is 30-45°. The diameter of the smaller end of the gas dispersion hole 14 is 0.5-1 mm, and the porosity of the gas dispersion mesh 8 is greater than or equal to 60%. The gas dispersion mesh buffers and disperses the incoming gas, diverting the high-speed airflow into a low-speed airflow.
[0033] A gas diffusion structure 10, shaped like an hourglass, is provided on the other side of the split dispersion net 8 within the mounting cavity of the flow guide shroud 5. The gas diffusion structure 10 includes a first conical cylinder 11 and a second conical cylinder 12, with the small ends of the first conical cylinder 11 and the second conical cylinder 12 facing each other. The gas diffusion structure has a central vent 13 penetrating through the small ends of both cylinders. The large end of the first conical cylinder 11 faces the gas dispersion net 8 to allow gas to enter, while the large end of the second conical cylinder 12 faces the gas sensor 6 to allow gas to diffuse to the gas sensor surface. The hourglass-shaped gas diffusion structure reduces the airflow velocity by converging the gas and then diffusing it.
[0034] A diffuser plate 11 is disposed between the large end of the second conical cylinder 12 and the gas sensor 6. The diffuser plate 11 is densely covered with multiple micropores. In this embodiment, the pore size of the micropores is 0.1-0.3 mm. The diffuser plate 11 is made of a honeycomb ceramic substrate, which diffuses the airflow directionally to the sensing layer of the gas sensor through capillary effect, avoiding the formation of turbulence in the sensing layer of the gas sensor. A waterproof and breathable membrane 9 is disposed between the large end of the first conical cylinder 11 and the gas dispersion net 8 to intercept water droplets and particulate matter. The waterproof and breathable membrane 9 is made of hydrophobic PTFE membrane.
[0035] The air intake structure of this invention adopts a multi-stage deceleration and diffusion structure. After passing through multiple stages of deceleration and diffusion, the incoming airflow can avoid forming turbulence on the surface of the gas sensor. At a wind speed of 10 m / s, the airflow velocity on the surface of the gas sensor can be stabilized at 0.2-0.8 m / s.
[0036] In the foregoing description of this specification, unless otherwise expressly specified and limited, the terms "fixed," "installed," "connected," or "joined" should be interpreted broadly. For example, the term "joined" can refer to a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; or it can refer to the internal communication of two components or the interaction between two components. Therefore, unless otherwise expressly limited in this specification, those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0037] Based on the above description in this specification, those skilled in the art will also understand that terms used, such as "upper," "lower," "front," "rear," "left," "right," "length," "width," "thickness," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," "center," "longitudinal," "transverse," "clockwise," or "counterclockwise," are terms indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings of this specification. They are only for the purpose of facilitating the explanation of the present invention and simplifying the description, and do not explicitly or implicitly suggest that the device or element involved must have the specific orientation, or be constructed and operated in a specific orientation. Therefore, the above-mentioned orientation or positional relationship terms should not be understood or interpreted as limitations on the present invention.
[0038] Furthermore, the terms "first" or "second," etc., used in this specification to refer to numbers or ordinal numbers are for descriptive purposes only and should not be construed as indicating, explicitly or implicitly, relative importance or specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this specification, "a plurality of" means at least two, such as two, three, or more, unless otherwise explicitly specified.
[0039] An embodiment of the gas detector's air intake structure of this utility model has the same structure as the air intake structures in the various embodiments of the gas detector described above, and will not be repeated here.
Claims
1. An air intake structure for a gas detector, characterized in that: The device includes a flow guide with a mounting cavity and an air inlet communicating with the mounting cavity. A gas dispersion mesh, with multiple gas dispersion holes, is located in the mounting cavity opposite the air inlet. A gas diffusion structure, shaped like an hourglass, is located on the other side of the dispersion mesh within the mounting cavity. The gas diffusion structure includes a first conical cylinder and a second conical cylinder, with the small ends of the first and second conical cylinders facing each other. The gas diffusion structure has a central air hole connecting the small ends of the first and second conical cylinders. The large end of the first conical cylinder faces the gas dispersion mesh to allow gas to enter, while the large end of the second conical cylinder faces the gas sensor inside the gas detector to allow gas to diffuse to the surface of the gas sensor.
2. The gas inlet structure of the gas detector according to claim 1, characterized in that: A diffuser plate is provided between the large end of the second conical cylinder and the gas sensor, and the diffuser plate is densely covered with multiple micro-pores.
3. The gas inlet structure of the gas detector according to claim 2, characterized in that: The pore size of the micropores is 0.1-0.3 mm.
4. The gas inlet structure of the gas detector according to claim 2, characterized in that: The diffuser plate is made of a honeycomb ceramic substrate.
5. The gas inlet structure of the gas detector according to claim 1, characterized in that: A waterproof and breathable membrane is provided between the large end of the first conical cylinder and the gas dispersion net.
6. The gas inlet structure of the gas detector according to claim 1, characterized in that: The gas dispersion holes on the gas dispersion net are conical holes, with the larger end of the conical hole facing the air inlet.
7. The gas inlet structure of the gas detector according to claim 6, characterized in that: The slope of the tapered hole is 30-45°.
8. The gas inlet structure of the gas detector according to claim 6, characterized in that: The diameter of the small end of the gas dispersion hole is 0.5-1 mm.
9. The gas inlet structure of the gas detector according to claim 6, characterized in that: The porosity of the gas dispersion mesh is greater than or equal to 60%.
10. A gas detector, comprising a housing, a gas sensor disposed inside the housing, and an air inlet structure disposed on the housing corresponding to the gas sensor, characterized in that: The air intake structure adopts the air intake structure described in any one of claims 1-9.