Sealing waterproof module of gas sensor

Abstract

The invention discloses a sealing waterproof module of a gas sensor. The sealing waterproof module comprises a buoyancy ball, a base, a shell and an end cover, the buoyancy ball is nested in the shell and floats up and down along the inner wall of the shell so as to be used for sealing a probe air inlet hole of the gas sensor; the base is mounted at a probe of the gas sensor, is used for mounting the shell and is matched with the buoyancy ball to protect the probe of the gas sensor from being damaged by external liquid; the end cover is fixed to the tail end of the shell and used for preventing the buoyancy ball from falling off from the shell. The gas sensor has the advantages of novel structure, high universality, low cost and the like, and the use safety of the gas sensor is improved.

Description

Technical Field

[0001] The invention relates to the technical field of gas sensors, and in particular to a gas sensor sealing and waterproof module. Background Art

[0002] With the rapid development of global industry and the gradual improvement of awareness of atmospheric environmental protection, gas sensors are increasingly used in industrial and daily life fields. In particular, with the popularization of pipeline gas, the number of gas sensors installed for monitoring gas leaks has increased year by year. At present, although the gas sensors used in outdoor valve wells are installed with sealed waterproof modules, they cannot be installed in some smaller valve wells in some urban areas due to their long size. Secondly, due to their long size and good sealing, when the gas gathers inside and reaches a certain concentration, it is very easy to generate false alarms, wasting the manpower and material resources of patrol personnel. How to reduce the volume of the waterproof module and the probability of false alarms has become an urgent problem to be solved. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a gas sensor sealing and waterproof module with novel structure, strong versatility and low cost, which is suitable for installation and use on the air inlet holes of various gas sensors.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A gas sensor sealed waterproof module, comprising: a buoyancy ball, a base, a shell and an end cover; The buoyancy ball is nested inside the shell and floats up and down along the inner wall of the shell to seal the probe air inlet hole of the gas sensor; The base is installed at the probe of the gas sensor to be used for installing the housing and cooperates with the buoyancy ball to protect the probe of the gas sensor from being invaded by external liquid; The end cap is fixed to the end of the shell to prevent the buoyancy ball from falling from the shell. As a further improvement of the present invention, the buoyancy ball includes a base and a sealing float. The base is nested inside the shell and floats up and down along the inner wall of the shell. The sealing float is arranged on the base to provide buoyancy and seal the probe air inlet of the gas sensor. As a further improvement of the present invention, the base is of a conical structure, with a plurality of protrusions evenly distributed on the outside of the base; a plurality of guide grooves are evenly distributed on the inner wall of the shell in the vertical direction, and the protrusions match the guide grooves to enable the buoyancy ball to float up and down inside the shell along the guide grooves. As a further improvement of the present invention, the sealing float is a hollow sphere, and a ring sleeve is provided on the outer periphery of the sealing float, and the ring sleeve is used to block the probe air inlet hole of the gas sensor. As a further improvement of the present invention, the base is made of polypropylene material, and the sealing float is made of liquid silicone material. As a further improvement of the present invention, the upper portion of the shell is provided with a plurality of ventilation holes evenly distributed along the circumferential direction. As a further improvement of the present invention, the shell is made of hard polytetrafluoroethylene material.

[0005] As a further improvement of the present invention, the bottom of the end cover adopts a hollow structure to facilitate the discharge of impurities in the shell. As a further improvement of the present invention, one end of the shell is threadedly connected to the base, and the other end of the shell is threadedly connected to the end cover. As a further improvement of the present invention, the inner wall of the lower end of the base is a smooth conical structure; the upper end of the base is threadedly connected to the gas sensor, and a sealant is applied at the connection between the base and the gas sensor. Compared with the prior art, the advantages of the present invention are: Compared with the existing long-cylindrical waterproof components, the gas sensor sealed waterproof module of the present invention has the characteristics of compact structure and small size, which allows the gas sensor to be installed in a place with a smaller space. Secondly, because a physical sealing method is adopted, and a circle of exhaust holes are processed around the upper end of the shell. In daily use, the air inlet of the gas sensor can effectively detect the ambient gas, and it is not easy to discharge the gas due to gas accumulation like the gas sensor equipped with a long-cylindrical waterproof component, resulting in frequent false alarm signals. Finally, the waterproof module of the present invention has a simple installation process, and there is no need to perform sealing detection on the waterproof module after installation, which greatly reduces the production and testing costs. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a schematic diagram of the three-dimensional structure principle of the gas sensor sealing and waterproof module in a specific embodiment of the present invention; Figure 2 It is a schematic diagram of the bottom-up structural principle of the gas sensor sealing and waterproof module in a specific embodiment of the present invention; Figure 3 It is a schematic diagram of the structural principle of the buoyancy ball in a specific embodiment of the present invention; Figure 4 It is a schematic diagram of the activity trajectory of the buoyancy ball in a specific embodiment of the present invention; Figure 5 It is a schematic diagram of the structural principle of the buoyancy ball in a sealed state in a specific embodiment of the present invention; Legend: 1. Buoyancy ball; 11. Base; 12. Sealing float; 13. Protrusion; 14. Ring; 2. Base; 3. Shell; 31. Guide groove; 32. Vent; 4. End cover; 5. Gas sensor; 6. Water. DETAILED DESCRIPTION

[0006] The present invention is further described below in conjunction with the accompanying drawings and specific preferred embodiments, but the protection scope of the present invention is not limited thereby.

[0007] In the description of the present invention, it should be understood that the terms "side", "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0008] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0009] Example like Figures 1 to 5 As shown, the gas sensor sealing and waterproof module of the present invention includes: a buoyancy ball 1, a base 2, a shell 3 and an end cap 4. The buoyancy ball 1 is embedded in the shell 3 and floats up and down along the inner wall of the shell 3 to seal the probe air inlet of the gas sensor 5. The base 2 is installed on the threaded interface at the probe of the gas sensor 5 for installation of the shell 3, and cooperates with the buoyancy ball 1 to protect the probe of the gas sensor 5 from damage by water immersion. The end cap 4 is fixed to the end of the shell 3 to prevent the buoyancy ball 1 from falling from the shell 3, and can discharge impurities and foreign matter such as mud and sand in the shell 3.

[0010] like Figure 2 and Figure 3 As shown, the buoyancy ball 1 includes a base 11 and a sealing buoy 12 disposed on the base 11. The base 11 is used to fix / bond the sealing buoy 12 and prevent foreign matter such as mud from adhering; the sealing buoy 12 is used to provide buoyancy for the buoyancy ball 1 and seal the gas sensor 5 probe air inlet.

[0011] In this embodiment, the base 11 is made of low-density polypropylene (PP) material, which has certain buoyancy and good hydrophobicity, flame retardancy, weather resistance and self-cleaning properties. The base 11 has a conical structure, and the upper end of the base 11 has a semicircular protrusion 13; the conical structure at the lower end of the base 11 is conducive to preventing foreign matter such as mud and sand from sticking.

[0012] In this embodiment, the sealing float 12 is a hollow sphere made of liquid silicone material and has good buoyancy. A ring sleeve 14 for sealing is also processed at the lower part of the sealing float 12.

[0013] like Figure 4 As shown, in this embodiment, the inner wall of the lower end of the base 2 is a smooth conical structure with a large cone angle and a low height, which is conducive to the discharge of residual gas during daily detection. The inner wall of the upper end of the base 2 is processed with an internal thread of a certain depth to connect to the bottom of the gas sensor 5. When in use, the internal thread of the upper end of the base 2 must be coated with sealant to enhance the fixing strength and reliability and improve the sealing of the threaded joint. The outer wall of the base 2 is processed with a plane for installation to facilitate fixing with the gas sensor 5.

[0014] like Figure 5 As shown, in this embodiment, the outer shell 3 is made of hard polytetrafluoroethylene (TPFE), and the inner wall is processed with four smooth semicircular guide grooves 31, which are used to limit the buoyancy ball 1 when floating up and down. The radius of the outer protrusion 13 of the base 11 is slightly smaller than the radius of the guide groove 31 on the inner wall of the outer shell 3, so that the buoyancy ball 1 can float freely in the outer shell 3. An internal thread is provided at the top of the outer shell 3, and an external thread is provided at the lower end of the base 2 to achieve a threaded connection between the base 2 and the outer shell 3. A circle of air vents 32 are provided at the upper end of the outer shell 3 in the circumferential direction, and the air vents 32 are located at the lower part of the internal threads of the outer shell 3. The outer wall of the outer shell 3 is processed with an inclination to prevent mud and sand from adhering. As shown Figure 4 As shown, after the shell 3 is installed in place, the effective height inside it is greater than the height of the buoyancy ball 1, so that the buoyancy ball 1 can float freely up and down inside the shell 3 as the water level rises and falls.

[0015] like Figure 2 and Figure 5 As shown, in this embodiment, the upper end of the end cap 4 is provided with an internal thread, and the lower end of the shell is provided with an external thread, so that the end cap 4 is threadedly connected to the shell 3. The bottom of the end cap 4 is a hollow structure. Specifically, a round hole is processed in the middle of the bottom of the end cap 4 to facilitate the discharge of the mud and sand gathered at the bottom of the buoyancy ball 1; fan-shaped holes are processed around the bottom plane to facilitate the discharge of water 6, mud and sand and other foreign matter flowing into the vent hole 32 on the side of the shell 3.

[0016] like Figures 4 to 5As shown, the gas sensor sealed waterproof module of the present invention, when there is no flooding in daily life, the buoyancy ball 1 falls on the bottom of the end cap 4, and the gas sensor 5 can detect the environmental gas components normally due to the presence of the vent hole 32 on the side of the shell 3, and because the lower part of the base 2 is small in height and the conical opening is large, it is conducive to the discharge of gas, and the gas sensor 5 will not produce false alarms due to excessive local gas concentration caused by gas accumulation. When encountering flooding, the buoyancy ball 1 has a large buoyancy and will float upward along the guide groove 31 on the inner wall of the shell 3. When water 6 enters from the vent hole 32 of the shell 3, because the outer diameter of the buoyancy ball 1 is smaller than the inner diameter of the shell 3, the water 6 will pass through the buoyancy ball 1 and be discharged through the hole at the bottom of the end cap 4, and will not affect the floating of the buoyancy ball 1. When the water level rises to the middle height position of the vent hole 32 of the shell 3, the buoyancy ball 1 has begun to contact the conical surface of the inner wall of the lower end of the base 2; when the water level continues to rise, the sealing float 12 will completely contact the base 2 to form a double seal. The higher the water level, the greater the pressure acting on the sealing float 12, and the better the sealing effect.

[0017] Because the material of the base 2 has good self-cleaning properties and the conical surface at the lower end is relatively smooth, it is not easy to adhere. When the water level drops, the pressure acting on the sealing float 12 gradually decreases, and the buoyancy ball 1 will float downward with the water level. The ring 14 of the sealing float 1 will also sweep the foreign matter on the inner wall of the shell 3 downward and discharge it outward through the hole at the bottom of the end cover 4. When the sealing float 1 passes over the vent 32 of the shell 3, the gas sensor 5 can normally detect the gas composition of the external environment. The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A gas sensor sealed waterproof module, characterized in that: include: A buoyancy ball (1), a base (2), a housing (3) and an end cover (4); The buoyancy ball (1) is nested inside the outer shell (3) and floats up and down along the inner wall of the outer shell (3) to seal the probe air inlet hole of the gas sensor (5); The base (2) is installed at the probe of the gas sensor (5) to be used for installing the housing (3), and cooperates with the buoyancy ball (1) to protect the probe of the gas sensor (5) from being damaged by external liquid; The end cover (4) is fixed to the end of the outer shell (3) to prevent the buoyancy ball (1) from falling out of the outer shell (3).

2. The gas sensor sealing and waterproof module according to claim 1, characterized in that: The buoyancy ball (1) comprises a base (11) and a sealing float (12); the base (11) is nested inside the housing (3) and floats up and down along the inner wall of the housing (3); the sealing float (12) is arranged on the base (11) to provide buoyancy and seal the probe air inlet of the gas sensor (5).

3. The gas sensor sealing and waterproof module according to claim 2, characterized in that: The base (11) is of a conical structure, and a plurality of protrusions (13) are evenly distributed on the outer side of the base (11); a plurality of guide grooves (31) are evenly distributed on the inner wall of the shell (3) along the vertical direction, and the protrusions (13) match the guide grooves (31) to enable the buoyancy ball (1) to float up and down inside the shell (3) along the guide grooves (31).

4. The gas sensor sealing and waterproof module according to claim 3, characterized in that: The sealing float (12) is a hollow sphere, and a ring sleeve (14) is provided on the outer periphery of the sealing float (12), wherein the ring sleeve (14) is used to seal the probe air inlet hole of the gas sensor (5).

5. The gas sensor sealing and waterproof module according to claim 3, characterized in that: The base (11) is made of polypropylene material, and the sealing float (12) is made of liquid silicone material.

6. The gas sensor sealing and waterproof module according to claim 5, characterized in that: The upper part of the shell (3) is provided with a plurality of ventilation holes (32) evenly distributed along the circumferential direction.

7. The gas sensor sealing and waterproof module according to any one of claims 1 to 6, characterized in that: The outer shell (3) is made of hard polytetrafluoroethylene material.

8. The gas sensor sealing and waterproof module according to any one of claims 1 to 6, characterized in that: The bottom of the end cover (4) adopts a hollow structure to facilitate the discharge of impurities in the outer shell (3).

9. The gas sensor sealing and waterproof module according to any one of claims 1 to 6, characterized in that: One end of the outer shell (3) is threadedly connected to the base (2), and the other end of the outer shell (3) is threadedly connected to the end cover (4).

10. The gas sensor sealing and waterproof module according to any one of claims 1 to 6, characterized in that: The inner wall of the lower end of the base (2) is a smooth conical structure; the upper end of the base (2) is threadedly connected to the gas sensor (5), and a sealant is applied at the connection between the base (2) and the gas sensor (5).

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