Protective structure for gas sensor and gas sensing module

Abstract

The utility model discloses a protective structure for a gas sensor, which comprises a shell provided with a gas inlet channel and used for mounting a light path module; a filtering unit is arranged on one side of the light path module close to the air inlet channel; an included angle is formed between a plane where at least one part of one surface of the filtering unit close to the light path module is located and a plane where the light path module is located; according to the utility model, the inclined surface is arranged on one surface, close to the light path module, of the filtering unit, so that when water is condensed on the filtering unit, the water on the surface of the filtering unit flows towards the inclined lower part due to the gravity of the water to take away the water condensed on the surface of the filtering unit once the water is condensed on the filtering unit, and the formation of a water film on the whole surface is damaged; and according to the application requirements of different environment humidity, the filtering units of different levels can be selected or the inclination angles of the filtering units can be adjusted, so that the optimal protection effect and airflow smoothness are achieved, and the device is high in flexibility and more practical.

Description

TECHNICAL FIELD

[0001] The utility model relates to laser spectrum gas sensor technical field especially relates to a protection structure and gas sensing module for gas sensor. BACKGROUND

[0002] In recent years, with the high-speed development of China's economy, gas sensors have been widely used in many fields such as industry, agriculture, medical treatment, environmental monitoring. Gas sensors can provide important environmental information by detecting the concentration and composition of specific gases, so as to monitor and alarm. However, in practical application, gas sensors often face the challenge of high humidity and even need to be flooded in harsh environment.

[0003] To meet the requirements of the above application environment, the conventional gas sensor is vertically placed, and the air inlet channel is below the filter unit. In this case, the air inlet part of the sensor is generally provided with a filter unit, however, in actual use, water vapor is easy to condense on the surface of the filter unit to form a water film, which will directly block the micro-permeable holes of the air permeable element, causing the air permeable filter to be completely air-tight and invalid. This situation is especially common in high humidity environment, which seriously affects the normal use and service life of the gas sensor, resulting in the decrease of the measurement accuracy of the sensor, and even invalidation.

[0004] Therefore, in order to maintain the normal work of the sensor, some manufacturers take the structure of the gas sensor convenient to replace waterproof air permeable film as disclosed in the Chinese utility model with publication number CN218824169U to improve the convenience of replacing the waterproof air permeable film and replace the waterproof air permeable film in time, however, this will result in higher use cost of the sensor, which is not conducive to improving the durability and adaptability of the device.

[0005] Therefore, further research and development are needed to solve the problems existing in the above-mentioned prior art. CONTENT OF THE UTILITY MODEL

[0006] Therefore, in order to solve the problems existing in the above-mentioned prior art, one of the purposes of the utility model is to provide a protection structure for gas sensor, which is inclined to place the filter unit, further increases the flow guide strip, prevents the formation of water film, accelerates the removal of moisture, and ensures the normal work and service life of the gas sensor in high humidity environment.

[0007] The second purpose of the utility model is to provide a gas sensing module comprising the above-mentioned protection structure.

[0008] To achieve one of the above-mentioned purposes, the utility model provides the following technical scheme:

[0009] The application discloses a protection structure for a gas sensing module, which is applied to a ventilation structure of the gas sensing module and prevents water vapor from entering and affecting detection of the gas sensing module on a gas; the protection structure comprises a shell with an air inlet channel; the shell is provided with a mounting cavity for mounting the optical path module, and the mounting cavity is communicated with an air inlet of the air inlet channel of the shell; one side of the optical path module close to the air inlet channel is provided with a filter unit; an angle is formed between a plane where at least a part of one side of the filter unit close to the optical path module is located and a plane where a mounting surface of the optical path module is located, so that water droplets condensed on a surface of the filter unit are guided and drained.

[0010] Further, the air inlet is arranged at a bottom of the shell; at least one filter unit is arranged at the air inlet position, and an angle is formed between a plane where at least a part of one side of the filter unit close to the optical path module is located and a plane where the optical path module is located; the bottom of the shell is provided with a limiting structure for mounting the filter unit.

[0011] Further, two filter units can be arranged on the limiting structure in a same direction or an opposite direction and in a spaced or sequential manner towards the air inlet;

[0012] Alternatively, one filter unit is arranged on the limiting structure in a tilted manner towards the air inlet, and the other filter unit is arranged on the limiting structure in parallel with the optical path module, so that an angle is formed between a plane where one side of the filter unit close to the optical path module is located and a plane where the mounting surface of the optical path module is located.

[0013] Further, the filter unit comprises a waterproof and air-permeable film and / or a mesh filter structure arranged at the air inlet position; the waterproof and air-permeable film is arranged in parallel with the mounting surface of the optical path module, and the mesh filter structure is arranged in a tilted manner towards the air inlet.

[0014] Further, at least a part of one side of the mesh filter structure close to the waterproof and air-permeable film is provided with a flow guide part protruding towards the waterproof and air-permeable film, so that water droplets condensed on a surface of the filter unit are guided and drained from side portions of the flow guide part.

[0015] Further, at least one flow guide strip is arranged on a surface of the waterproof and air-permeable film or the mesh filter structure, and the flow guide strip is arranged in a water droplet guiding direction of the surface of the mesh filter structure.

[0016] Further, two flow guide strips are arranged on the surface of the mesh filter structure in a spaced manner, and the flow guide strips can be made of a metal material or a non-metal material.

[0017] Further, the shell is provided with an upper cover and a lower cover for external connection at the opening of the mounting cavity, respectively; the upper cover and the lower cover are threadedly connected or buckled with the shell, respectively; the optical path module is arranged in the inner cavity of the lower cover through an optical path air chamber; the inner wall of the lower cover is radially inclined and protruded to form the limiting structure.

[0018] Further, the mesh filter structure is a metal filter screen, and the surface of the metal filter screen is sprayed with hydrophobic paint.

[0019] To achieve the above-mentioned second purpose, the utility model provides the following technical scheme:

[0020] A gas sensing module comprising the above-mentioned protective structure for a gas sensor, further, a limiting gasket is arranged between the optical path air chamber and the waterproof air-permeable membrane; a sealing ring is arranged at the connection between the outer periphery of the optical path air chamber and the lower cover and at the connection between the lower cover and the shell, respectively; the mounting cavity of the shell is provided with a PCB circuit board, and the PCB circuit board is electrically connected with the optical path module.

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

[0022] 1) The utility model discloses a filter unit is arranged in multiple ways, so that the plane where at least a part of the one side of the filter unit close to the optical path module is located and the plane where the mounting surface of the optical path module is located form an included angle, when water condenses on the filter unit, the water will flow downward due to its own gravity and take away the water condensed on the surface of the filter unit, thereby destroying the formation of the water film on the whole surface, preventing water or water vapor from being retained, avoiding the filter unit from being blocked, and maintaining the air permeability.

[0023] In addition, one or more water guide strips are installed on the surface of the inclined filter unit, which also utilizes the surface tension of water to attract the water condensed on the surface of the filter unit to the water guide strips, accelerates the water condensed on the surface of the filter unit to concentrate on the water guide strips, quickly forms larger water droplets and flows away, further prevents the formation of a water film, improves the air permeability of the filter unit, ensures the normal operation of the gas sensor in a high-humidity environment, and thus guarantees the measurement accuracy and response speed of the gas sensor, especially in a gas detection scene requiring rapid response.

[0024] 2) The placement mode of the filter unit is flexible, two filter units can be inclined in the same direction at the same time, can be inclined in the opposite direction at the same time, or one is inclined and the other is placed horizontally. The preferred placement mode is that the outer filter unit close to the air inlet is inclined, and the inner filter unit is placed horizontally, which can remove most of the moisture in the outer inclined filter unit, and the inner horizontal filter unit further filters the remaining small moisture and impurities, so that the filtering efficiency and airflow smoothness can be considered; further, the surface of the filter unit can be sprayed with hydrophobic paint, which can effectively enhance the water-repellent performance of the surface of the filter unit, maximize the prevention of water film formation, thereby improving the air permeability of the filter unit.

[0025] 3) The protective structure design of the utility model can select filter units of different levels or adjust the inclination angle of the filter unit according to the application requirements of different environmental humidity, so as to realize the best protection effect and airflow smoothness, and is flexible and practical. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 It is the overall structure schematic diagram of the protective structure for gas sensor of the utility model embodiment 1-4;

[0027] Figure 2 It is the overall structure partial section schematic diagram of the protective structure for gas sensor of the utility model embodiment 1;

[0028] Figure 3 It is the exploded schematic diagram of the overall structure of the protective structure for gas sensor of the utility model embodiment 1;

[0029] Figure 4 It is the overall structure vertical section schematic diagram of the protective structure for gas sensor of the utility model embodiment 1;

[0030] Figure 5 It is the vertical section schematic diagram of the overall structure of the protective structure for gas sensor of the utility model embodiment 1 from another angle;

[0031] Figure 6 It is the vertical section schematic diagram of the overall structure of the protective structure for gas sensor of the utility model embodiment 2;

[0032] Figure 7 It is the vertical section schematic diagram of the overall structure of the protective structure for gas sensor of the utility model embodiment 3;

[0033] Figure 8 It is the overall structure schematic diagram of the lower cover of the protective structure for gas sensor of the utility model embodiment 1-4.

[0034] In the drawing:

[0035] 1, shell; 11, mounting cavity; 12, air inlet; 2, waterproof and breathable membrane; 3, mesh filter structure; 4, flow guide strip; 5, upper cover; 6, lower cover; 61, limiting structure;

[0036] 20, optical path module; 201, optical path air chamber; 30, limiting gasket; 40, sealing ring; 50, PCB circuit board;

[0037] α, the angle between the plane on which at least a part of the filter unit is located and the plane on which the waterproof and breathable membrane is located. DETAILED DESCRIPTION

[0038] In order to facilitate the understanding of the present application, the technical solutions and advantages of the present application will be further described in detail below in combination with the drawings and examples. The specific structure and characteristics of the present application are described below by way of example, which should not constitute any limitation on the present application. At the same time, any one of the technical features mentioned below (including implied or disclosed) and any one of the technical features directly shown or implied in the drawings can be arbitrarily combined or deleted between these technical features, thereby forming more other embodiments that may not be directly or indirectly mentioned in the present application. The preferred embodiments of the present application are shown in the drawings. However, the present application can be realized in many different forms, and is not limited to the embodiments described herein.

[0039] In the description of the present application, unless otherwise stated, the components used are conventional components in the prior art.

[0040] Example 1

[0041] As shown in Figures 1-5 , 8, the present application provides a protective structure for a gas sensor, which is applied to the ventilation structure of a gas sensing module to prevent water vapor from affecting the detection of the optical path module 20 on the gas. The protective structure includes a shell 1 with an air inlet channel, the shell 1 is used to install the optical path module 20; the shell 1 is provided with a mounting cavity 11 for installing the optical path module 20, and the mounting cavity 11 is in communication with the air inlet 12 of the air inlet channel of the shell 1; the optical path module 20 is provided with a filter unit on one side close to the air inlet channel; the plane on which at least a part of the filter unit is located is formed with an angle α with the plane on which the mounting surface of the optical path module 20 is located (the optical path module is a columnar module as a whole, and the mounting surface refers to the bottom plane of the optical path module), so as to guide and discharge the water droplets condensed on the surface of the filter unit.

[0042] Generally, the air inlet 12 is arranged at the bottom of the shell 1; at least one filter unit is arranged at the position of the air inlet 12, and an included angle a is formed between the plane in which at least a part of the side of the filter unit close to the light path module 20 is located and the plane in which the mounting surface of the light path module 20 is located; and the bottom of the shell 1 is provided with a limiting structure for mounting the filter unit.

[0043] In the embodiment, the included angle a can be selected from 0-90°, as long as it can meet the requirements of condensing water droplets and guiding water flow.

[0044] In the embodiment, the two filter units can be arranged on the limiting structure in the same direction or in the opposite direction, respectively, and can be arranged in the direction of the air inlet 12.

[0045] Specifically, the filter unit comprises a waterproof and breathable film 2 and / or a mesh filter structure 3 arranged at the position of the air inlet 12.

[0046] Preferably, the filter unit comprises a waterproof and breathable film 2 and a mesh filter structure 3; the waterproof and breathable film 2 is arranged in parallel with the light path module 20, and the mesh filter structure 3 is arranged in the direction of the air inlet 12.

[0047] In the embodiment, when water condenses on the waterproof and breathable film 2 and / or the mesh filter structure 3, the water will flow in the direction of the inclination due to gravity, thereby destroying the formation of the water film, avoiding the clogging of the filter, and maintaining the air permeability. The selection of the inclination angle can be adjusted according to the actual application environment to ensure that the water can flow away smoothly at the optimal angle.

[0048] In the embodiment, the waterproof and breathable film 2 can be prepared from the materials of the prior art, which are not limited here. Preferably, the mesh filter structure 3 is a metal filter screen, and the surface of the metal filter screen is sprayed with a hydrophobic coating. The hydrophobic coating can effectively enhance the water-repellent performance of the surface of the metal filter screen, and maximize the prevention of the formation of the water film, thereby improving the air permeability of the metal filter screen. The selection of the hydrophobic coating should have good durability and stability to ensure its long-term effectiveness.

[0049] To further prevent the formation of the water film, preferably, at least one water flow guide strip 4 is arranged on the surface of the waterproof and breathable film 2 or the mesh filter structure 3, and the water flow guide strip 4 is arranged in the water droplet flow direction on the surface of the waterproof and breathable film 2 or the mesh filter structure 3. In the embodiment, the water flow guide strip is preferably arranged on the inclined surface of the mesh filter structure 3, and can be made of metal or non-metal materials. By using the surface tension of water, the water condensed on the surface of the mesh filter structure 3 is attracted to the water flow guide strip, so as to accelerate the aggregation and flow of the condensed water, and further prevent the formation of the water film.

[0050] Further, two said flow guide bars 4 are arranged on the surface of said mesh filter structure 3, said flow guide bars 4 can be made of metal or non-metal materials. In this embodiment, the benefits of designing two flow guide bars 4 are that water droplets can be more effectively guided to drain, and water droplets can be prevented from stagnating or forming water accumulation on the surface of the filter unit. By evenly distributing the pressure of water droplet drainage, the problem of local water accumulation is reduced, ensuring that moisture on the entire surface can be quickly drained away, thereby improving the stability and performance of the gas sensor.

[0051] Further, the opening of the mounting cavity 11 of the shell 1 is respectively provided with an upper cover 5 and a lower cover 6 for external connection; the upper cover 5 and the lower cover 6 are respectively threadedly connected or snap-connected with the shell 1; the optical path module 20 is arranged in the inner cavity of the lower cover 6 through an optical path air chamber 201; the inner wall of the lower cover 6 is radially inclined and protruded to form the limiting structure 61.

[0052] In this embodiment, the waterproof and breathable film 2 or the mesh filter structure 3 and the limiting structure 61 are integrated into the lower cover 6, and the design of the radially inclined and protruded limiting structure 61 of the inner wall not only prevents the waterproof and breathable film 2 or the mesh filter structure 3 from moving or displacing during use, but also reduces the number of components and improves the compactness and stability of the device.

[0053] The utility model discloses a waterproof and breathable film 2 or mesh filter structure 3 is placed obliquely, when water condensation on the filter unit, water will flow to the oblique lower side due to its own gravity and take away the water condensed on the surface of the filter unit, thereby destroying the formation of the water film on the whole surface, to prevent water accumulation or water vapor stagnation, avoid the blockage, keep the air permeability;

[0054] In addition, one or more water guide strips are installed on the surface of the inclined waterproof and breathable film 2 or mesh filter structure 3, which also uses the surface tension of water to attract the water condensed on the surface of the filter unit to the water guide strip, accelerates the water condensed on the surface of the filter unit to concentrate on the water guide strip, and quickly forms larger water droplets to flow away, further preventing the formation of a water film; improve the air permeability of the filter unit, ensure the normal operation of the gas sensor in a high humidity environment, thereby ensuring the measurement accuracy and response speed of the gas sensor, especially in the gas detection scene that requires rapid response.

[0055] The placement mode of the filter unit of the utility model is flexible, and other setting forms can also be adopted to adapt to different environments. Moreover, different levels of filter units or the inclination angle of the filter unit can be selected according to the application requirements of different environmental humidity, so as to realize the best protection effect and air flow smoothness, and the utility model is strong in flexibility and practical.

[0056] Example 2

[0057] As Figure 1 ,6 As shown in Figure 8, this embodiment 2 provides a protective structure for a gas sensing module. The difference from embodiment 1 is that the filter unit is arranged differently: a waterproof and breathable membrane 2 or a mesh filter structure 3 is sequentially provided on the limiting structure 61. The waterproof and breathable membrane 2 or the mesh filter structure 3 are respectively inclined in the same direction or opposite direction to the air inlet 12 on the limiting structure 61; the plane of the side of the membrane close to the optical path module 20 forms an angle with the plane of the mounting surface of the optical path module 20.

[0058] Example 3

[0059] like Figure 1 , 7 As shown in Figure 8, this embodiment 3 provides a protective structure for a gas sensing module. The difference from embodiment 1 lies in the arrangement of the filter unit: at least a portion of the side of the mesh filter structure 3 near the waterproof and breathable membrane has a guide portion protruding towards the waterproof and breathable membrane, to guide and drain water droplets condensed on the surface of the filter unit from the side of the guide portion. This guide portion can be in the form of an inverted V-shape, an arc shape, or other protrusions to increase the direction of water flow and adapt to different environments.

[0060] Example 4

[0061] like Figures 1-8 As shown, this embodiment 4 provides a gas sensing module, including the protective structure for gas sensors described in embodiments 1-3 above. The gas sensing module of this embodiment 4 can select and adjust the number and angle of filter units as needed.

[0062] Furthermore, a limiting gasket 30 is provided between the optical path air chamber 201 and the waterproof and breathable membrane 2; sealing rings 40 are provided at the connection between the outer periphery of the optical path air chamber and the lower cover 6, and at the connection between the lower cover 6 and the housing 1; the mounting cavity 11 of the housing 1 is provided with a PCB circuit board 50, and the PCB circuit board 50 is electrically connected to the optical path module 20.

[0063] It should be noted that this utility model also includes other devices or components that fulfill the functions of a gas sensor, which will not be elaborated here; and this utility model does not involve any improvement to the optical path module 20. The composition and working principle of the optical path module can be referred to in the prior art gas sensing optical path module, which generally includes a heat sink, a chip, a TEC, etc., which will not be elaborated here either.

[0064] The above embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of protection of the present utility model. For those skilled in the art, it will be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A protective structure for a gas sensor, applied to a ventilation structure of a gas sensing module, preventing water vapor from entering and affecting the detection of the gas by the light path module; characterized in that, The application relates to a light path module, which comprises a shell with an air inlet channel; the shell is provided with a mounting cavity for mounting the light path module, and the mounting cavity is communicated with an air inlet of the air inlet channel of the shell; one side of the light path module close to the air inlet channel is provided with a filtering unit; an angle is formed between the plane where at least a part of the side of the filtering unit close to the light path module is located and the plane where the mounting surface of the light path module is located, so as to guide and remove water drops condensed on the surface of the filtering unit.

2. The gas sensor protection structure according to claim 1, wherein The air inlet is arranged at the bottom of the shell; at least one filtering unit is arranged at the position of the air inlet, and an angle is formed between the plane where at least a part of the side of the filtering unit close to the light path module is located and the plane where the mounting surface of the light path module is located; the bottom of the shell is provided with a limiting structure for mounting the filtering unit.

3. The gas sensor protection structure according to claim 2, wherein Two filtering units can be arranged on the limiting structure in the same direction or in the opposite direction and can be spaced or arranged in sequence towards the air inlet; Alternatively, one filtering unit is arranged on the limiting structure towards the air inlet, and the other filtering unit is arranged on the limiting structure horizontally and parallel to the light path module, so that an angle is formed between the plane where the side of the filtering unit close to the light path module is located and the plane where the mounting surface of the light path module is located.

4. The gas sensor protection structure according to claim 2, wherein The filtering unit comprises a waterproof and air-permeable film and / or a mesh filtering structure arranged at the position of the air inlet; the waterproof and air-permeable film is arranged parallel to the mounting surface of the light path module, and the mesh filtering structure is arranged obliquely towards the air inlet.

5. The gas sensor protection structure according to claim 4, wherein At least a part of the side of the mesh filtering structure close to the waterproof and air-permeable film is provided with a flow guide part protruding towards the waterproof and air-permeable film, so as to guide and remove water drops condensed on the surface of the filtering unit from the side of the flow guide part.

6. The gas sensor protection structure according to claim 4 or 5, wherein At least one flow guide strip is arranged on the surface of the waterproof and air-permeable film or the mesh filtering structure, and the flow guide strip is arranged along the water drop guiding direction of the surface of the mesh filtering structure.

7. The gas sensor protection structure according to claim 6, wherein Two flow guide strips are arranged on the surface of the mesh filtering structure, and the flow guide strips can be made of metal materials or non-metal materials.

8. The gas sensor protection structure according to claim 7, wherein An upper cover and a lower cover for external connection are arranged on the shell at the opening of the mounting cavity respectively; the upper cover and the lower cover are threadedly connected or buckled connected with the shell respectively; the light path module is arranged in the inner cavity of the lower cover through a light path air chamber; the inner wall of the lower cover is radially and obliquely protruded to form the limiting structure.

9. The gas sensor protection structure according to claim 8, wherein The mesh filtering structure is a metal filter screen, and the surface of the metal filter screen is sprayed with hydrophobic paint.

10. A gas sensing module comprising the protective structure for a gas sensor according to claim 8 or 9, characterized by A limiting gasket is arranged between the light path air chamber and the waterproof and air-permeable film; sealing rings are arranged at the connection between the outer periphery of the light path air chamber and the lower cover and at the connection between the lower cover and the shell respectively; the mounting cavity of the shell is provided with a PCB circuit board, and the PCB circuit board is electrically connected with the light path module.

Images