A sensor assembly structure

Abstract

The application relates to a sensor assembly structure, and relates to the technical field of sensors, and is used for providing a novel sensor assembly structure which is simple to assemble and has good dustproof effect. The sensor assembly structure comprises a base, a PCB board and a sensing element, a top cover and a clamping assembly. The base is provided with a containing cavity, the containing cavity is provided with an opening through the top of the base, and the outer ring wall of the opening is a cylindrical wall surface. The PCB board and the sensing element are arranged in the containing cavity, the wiring post of the PCB board and the sensing element can penetrate through the side wall plate of the base away from the opening and extend to the outside of the base. The top cover is abutted to the opening of the base, the wall surface of the top cover in contact with the base extends in the direction of the base to form an extension part, the inner wall of the extension part is cylindrical, and a gap is arranged between the inner wall of the extension part and the outer ring wall where the opening is located. The clamping assembly is arranged between the outer ring wall of the base and the inner wall of the extension part, the clamping assembly is arranged as at least two groups, and the at least two groups of clamping assemblies are distributed in a circumferential direction and are spaced apart around the axis of the containing cavity.

Description

Technical Field

[0001] This application relates to the field of sensor technology, and in particular to a sensor assembly structure. Background Technology

[0002] As a detection device, sensors are widely used in industrial automation, smart homes, automotive electronics and other fields.

[0003] The assembly structure of a sensor has a significant impact on its performance stability, assembly efficiency, and production cost. Current assembly methods for sensor housings mainly include self-injection molding bayonet assembly, screw assembly, and laser welding.

[0004] Among them, self-injection molded bayonet assembly is prone to loosening due to material fatigue; screw assembly requires additional fastening parts, the assembly process is cumbersome and the sealing is poor; laser welding relies on high-precision welding equipment, which is costly and not conducive to later maintenance and disassembly. Utility Model Content

[0005] This application provides a sensor assembly structure, which is a new sensor assembly structure that is simple to assemble and has good dustproof effect.

[0006] This application provides a sensor assembly structure, including a base, a PCB board and a sensing element, a top cover, and a snap-fit ​​assembly. The base has a receiving cavity, with an opening extending through the top of the base. The outer ring wall of the opening is cylindrical. The PCB board and the sensing element are disposed within the receiving cavity, and the terminals of the PCB board and the sensing element can pass through a side wall of the base away from the opening and extend to the outside of the base. The top cover abuts against the opening of the base, and the wall of the top cover in contact with the base extends in the direction of the base to form an extension. The inner wall of the extension is cylindrical, and a gap is provided between the inner wall of the extension and the outer ring wall where the opening is located. The snap-fit ​​assembly is provided. Between the outer ring wall of the base and the inner wall of the extension, at least two sets of snap-fit ​​components are provided. The at least two sets of snap-fit ​​components are circumferentially spaced around the axis of the receiving cavity. The snap-fit ​​components include snap-fit ​​protrusions provided on one of the inner walls of the base and the extension, and snap-fit ​​recesses provided on the other of the inner walls of the base and the extension. The snap-fit ​​recesses include snap-fit ​​channels along the axial direction of the receiving cavity and snap-fit ​​grooves provided at the bottom of the snap-fit ​​channels that extend in a direction perpendicular to the axial direction of the receiving cavity. The snap-fit ​​protrusions can slide into the snap-fit ​​channels along the axial direction of the receiving cavity and slide into the snap-fit ​​grooves by the rotation of the base and the top cover in the circumferential direction around the axis of the receiving cavity.

[0007] This application forms an assembly structure through a base, a top cover, and multiple sets of circumferentially distributed snap-fit ​​components. The snap-fit ​​components adopt a matching method of snap-fit ​​protrusions and snap-fit ​​recesses containing snap-fit ​​channels and snap-fit ​​grooves to achieve assembly of axial sliding followed by circumferential rotation. The assembly of the shell can be completed in only two steps: slide the snap-fit ​​protrusion into the snap-fit ​​channel along the axial direction, and then rotate the protrusion into the snap-fit ​​groove through circumferential rotation. The assembly process is simple and can improve assembly efficiency.

[0008] The inner wall of the top cover extension and the outer ring wall of the base form a clearance fit. With the circumferential distribution of the snap-fit ​​components, the contact area between the top cover and the base forms a surrounding closed structure, reducing the path for dust to enter from the assembly gap. At the same time, the tight engagement of the snap-fit ​​structure can reduce the loosening of gaps caused by vibration, indirectly reducing the risk of dust entering.

[0009] While enabling rapid assembly, the structural design naturally forms a preliminary barrier against dust, balancing ease of assembly with basic dust prevention requirements, thus avoiding the problems of complex operation or reliance on equipment in traditional assembly methods.

[0010] In some embodiments of this application, the snap-fit ​​assembly further includes a limiting protrusion disposed in the snap-fit ​​groove. The limiting protrusion extends along the axial direction of the receiving cavity, and the snap-fit ​​protrusion is provided with a limiting recess that cooperates with the limiting protrusion, so that the snap-fit ​​protrusion can pass through the limiting protrusion and the limiting protrusion and the limiting recess cooperate.

[0011] A limiting protrusion extending along the axis is added to the snap-fit ​​groove to allow the snap-fit ​​protrusion to pass through and to make the limiting protrusion and the limiting recess cooperate. The limiting protrusion will hinder the sliding path of the snap-fit ​​protrusion to a certain extent and increase the assembly resistance. However, after the limiting protrusion enters the limiting recess, it can form a limit to avoid misalignment caused by shaking after assembly and improve assembly reliability.

[0012] In some embodiments of this application, the contact portion between the limiting protrusion and the locking groove is formed with an arc surface. The arc surface design reduces the frictional resistance when the locking protrusion slides over the limiting protrusion, making the circumferential rotation operation smoother, avoiding jamming caused by right angle or acute angle structures, reducing the force required during assembly, and improving the operating feel and efficiency.

[0013] In some embodiments of this application, the height of the limiting protrusion along the axial direction of the receiving cavity is 0.5mm to 3mm. This reasonable height allows the limiting protrusion and the snap-fit ​​protrusion to effectively compress each other, preventing structural deformation from creating new gaps, while also ensuring ease of assembly and dustproof performance.

[0014] In some embodiments of this application, the snap-fit ​​protrusion is formed on the inner wall surface of the extension of the top cover, and the snap-fit ​​recess is formed on the outer ring wall of the base, and the snap-fit ​​recess and the receiving cavity are set independently. The positional distribution of the protrusion and recess conforms to operating habits, and the independent snap-fit ​​recess design avoids structural interference, simplifies the processing technology of the base and the top cover, and indirectly reduces the alignment difficulty during assembly; by optimizing the position and independence of the protrusion and recess, the assembly operation is simplified, and the dust prevention hazards that the snap-fit ​​structure may bring are fundamentally solved.

[0015] In some embodiments of this application, the snap-fit ​​assembly is configured in two sets, which are symmetrically arranged around the axis of the receiving cavity. The symmetrical distribution of the two sets reduces the number of snap-fit ​​assemblies, thereby reducing processing costs and alignment difficulties during assembly; the symmetrical structure makes the force more uniform during circumferential rotation, resulting in smoother operation and avoiding jamming caused by uneven force.

[0016] In some embodiments of this application, the snap-fit ​​assembly is configured as at least three sets, which are circumferentially spaced around the axis of the receiving cavity. Multiple sets of positioning make the alignment of the top cover and the base more precise, reducing the risk of misalignment during assembly and indirectly improving assembly efficiency. The multi-point constraint formed by at least three sets of snap-fit ​​assemblies makes the fit between the top cover and the base tighter, with more uniform and smaller circumferential gaps. The multiple sets can distribute the force, reducing gaps caused by local deformation. Especially in vibration environments, it can maintain a more stable sealing state, and its dustproof effect is better than that of two sets of assemblies.

[0017] In some embodiments of this application, both the base and the top cover are made of rigid material. Rigid material is not easily deformed, which makes the mating dimensions of the snap-fit ​​protrusion and snap-fit ​​recess more stable, resulting in a more stable assembly effect.

[0018] In some embodiments of this application, the sensor assembly structure further includes a sealing layer disposed between the base and the top cover. During assembly, the sealing layer is naturally compressed as the top cover and base snap together, requiring no additional fixing steps and not increasing assembly complexity. Simultaneously, the elasticity of the sealing layer can compensate for minor dimensional errors, making assembly more error-tolerant. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the technical solution of this utility model and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solution of this utility model and do not constitute a limitation on the technical solution of this utility model.

[0020] Figure 1 This is a schematic diagram of a sensor assembly structure provided in an embodiment of this application.

[0021] Figure 2 This is a cross-sectional view of the base and top cover of a sensor assembly structure provided in an embodiment of this application.

[0022] Figure 3 This is an exploded view of the base and top cover of a sensor assembly structure provided in an embodiment of this application.

[0023] Reference numerals: 1-base; 11-receiving cavity; 12-opening; 2-PCB board and sensing element; 3-top cover; 31-extension; 4-snap assembly; 41-snap protrusion; 42-snap channel; 43-snap groove; 44-limiting protrusion; 45-limiting recess. Detailed Implementation

[0024] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0026] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0028] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0029] As a detection device, sensors are widely used in industrial automation, smart homes, automotive electronics and other fields.

[0030] The assembly structure of a sensor has a significant impact on its performance stability, assembly efficiency, and production cost. Current assembly methods for sensor housings mainly include self-injection molding bayonet assembly, screw assembly, and laser welding.

[0031] Among them, self-injection molded bayonet assembly is prone to loosening due to material fatigue; screw assembly requires additional fastening parts, the assembly process is cumbersome and the sealing is poor; laser welding relies on high-precision welding equipment, which is costly and not conducive to later maintenance and disassembly.

[0032] Therefore, please refer to Figure 1 This application provides a sensor assembly structure, including a base 1, a PCB board and a sensing element 2, a top cover 3, and a snap-fit ​​assembly 4.

[0033] Please refer to Figure 2 The base 1 has a receiving cavity 11, which extends through the top of the base 1 to form an opening 12. The outer ring wall of the opening 12 is a cylindrical wall. The base 1 can be made of a rigid material, preferably an iron-containing material or an aluminum alloy, thus having high structural strength and corrosion resistance.

[0034] Please refer to Figure 2 The shape of the receiving cavity 11 can be adapted to the shape of the PCB board and the sensing element 2, and is usually cylindrical or cuboid, to provide installation space and protection for the internal components. The receiving cavity 11 extends through the top of the base 1 to form an opening 12, and the outer ring wall of the opening 12 is a cylindrical wall, the diameter of which is designed according to the overall size of the sensor.

[0035] Please refer to Figure 1 The PCB board and sensing element 2 are disposed within the receiving cavity 11. The terminals of the PCB board and sensing element 2 can penetrate through one side wall of the base 1 away from the opening 12 and extend outside the base 1. The PCB board, which can be made of epoxy resin glass cloth substrate, is smaller than the cross-sectional dimension of the receiving cavity 11 to ensure stable placement. The sensing element can be soldered onto the PCB board. Depending on the sensor type, the sensing element can be a temperature sensor chip, humidity sensor chip, or pressure sensor chip, etc.

[0036] Please refer to Figure 1 The terminals of the PCB board and sensing element 2 can pass through the side wall of the base 1 away from the opening 12 and extend to the outside of the base 1. The terminals can be made of copper and pass through the pre-set through holes on the wall of the base 1 to realize the electrical connection between the sensor and the external circuit.

[0037] Please refer to Figure 2 The top cover 3 abuts against the opening 12 of the base 1. The wall of the top cover 3 that contacts the base 1 extends in the direction of the base 1 to form an extension 31. The inner wall of the extension 31 is cylindrical, and a gap is provided between the inner wall of the extension 31 and the outer ring wall where the opening 12 is located.

[0038] Please refer to Figure 2 The top cover 3 can also be made of a rigid material, and the material should be the same as or similar to that of the base 1 to ensure structural consistency and matching of thermal expansion coefficients after assembly. The top cover 3 abuts against the opening 12 of the base 1, and its shape can be designed as round or square, with a flat or curved surface on the top as needed.

[0039] Please refer to Figure 2 The wall of the top cover 3 that contacts the base 1 extends in the direction of the base 1 to form an extension 31. The inner wall of the extension 31 is cylindrical, and its inner diameter is larger than the diameter of the outer ring wall where the opening 12 of the base 1 is located, so that there is a gap between the inner wall of the extension 31 and the outer ring wall where the opening 12 is located, providing space for relative rotation during assembly.

[0040] Please refer to Figure 3 The snap-fit ​​assembly 4 is disposed between the outer ring wall of the base 1 and the inner wall of the extension 31. The snap-fit ​​assembly 4 is configured as at least two sets, and the at least two sets of snap-fit ​​assemblies 4 are circumferentially distributed around the axis of the receiving cavity 11 to ensure the balance and stability of the connection.

[0041] Please refer to Figure 3 The snap-fit ​​assembly 4 includes a snap-fit ​​protrusion 41 disposed on one of the inner walls of the base 1 and the extension 31, and a snap-fit ​​recess disposed on the other of the inner walls of the base 1 and the extension 31. The snap-fit ​​recess includes a snap-fit ​​channel 42 along the axial direction of the receiving cavity 11, and a snap-fit ​​groove 43 disposed at the bottom of the snap-fit ​​channel 42 extending in a direction perpendicular to the axial direction of the receiving cavity 11. The width of the snap-fit ​​channel 42 is slightly larger than the width of the snap-fit ​​protrusion 41, and the depth is adapted to the length of the extension 31. The length of the snap-fit ​​groove 43 is set as needed to ensure that the snap-fit ​​protrusion 41 can be fully inserted and confined.

[0042] Please refer to Figure 3 The snap-fit ​​protrusion 41 can slide into the snap-fit ​​channel 42 along the axial direction of the receiving cavity 11, and slide into the snap-fit ​​groove 43 by rotating the base 1 and the top cover 3 around the axis of the receiving cavity 11 in the circumferential direction. The positional relationship of the snap-fit ​​channel 42 and the snap-fit ​​groove 43 in all the snap-fit ​​recesses should be arranged in the same direction around the axis of the extension 31, so that when rotating in the same direction, the positions of all the snap-fit ​​protrusions 41 and all the snap-fit ​​recesses correspond and maintain the same movement.

[0043] The axis of the receiving cavity 11 refers to the axis of the cylindrical outer ring wall of the receiving cavity, and the axis of the receiving cavity 11 in this document and the axis of the inner ring wall of the extension 31 should be the same reference line.

[0044] Please refer to Figure 1-3 This application forms an assembly structure through a base 1, a top cover 3, and multiple sets of circumferentially distributed snap-fit ​​components 4. The snap-fit ​​components 4 adopt a matching method of snap-fit ​​protrusions 41, snap-fit ​​recesses containing snap-fit ​​channels 42 and snap-fit ​​grooves 43 to achieve axial sliding followed by circumferential rotation assembly. The assembly of the shell can be completed in only two steps: slide the snap-fit ​​protrusions 41 into the snap-fit ​​channels 42 along the axial direction, and then rotate circumferentially to make the protrusions enter the snap-fit ​​grooves 43. The assembly process is simple and can improve assembly efficiency.

[0045] The inner wall of the extension 31 of the top cover 3 and the outer ring wall of the base 1 form a gap fit. With the circumferential distribution of the snap-fit ​​assembly 4, the contact area between the top cover 3 and the base 1 forms a surrounding closed structure, reducing the path of dust intrusion from the assembly gap. At the same time, the tight engagement of the snap-fit ​​structure can reduce the gap loosening caused by vibration, indirectly reducing the risk of dust entering.

[0046] While enabling rapid assembly, the structural design naturally forms a preliminary barrier against dust, balancing ease of assembly with basic dust prevention requirements, thus avoiding the problems of complex operation or reliance on equipment in traditional assembly methods.

[0047] In some examples, the base 1 can be a cylindrical barrel shape as a whole, or it can have only a cylindrical outer ring wall at the top, while the other parts can be prisms or other shapes. The shape of the receiving cavity 11 can be cylindrical, prisms, or other irregular shapes.

[0048] In some examples, the body of the top cover 3 and the extension 31 can be integrally formed, or they can be formed by welding or subtractive processing; the thickness of the top cover 3 can be designed as needed, the inner wall of the extension 31 is cylindrical, and the outer wall can be cylindrical, prismatic, or other shapes.

[0049] For example, the snap-fit ​​channel 42 along the axial direction of the receiving cavity 11 can be located on the extension 31 or on the base 1. When it is located on the extension 31, it should penetrate the end of the extension 31 away from the opening 12. When it is located on the base 1, it needs to penetrate the outer wall where the opening 12 is located so as to facilitate the passage and engagement of the snap-fit ​​protrusion 41.

[0050] Please refer to Figure 3In some examples, the snap-fit ​​assembly 4 also includes a limiting protrusion 44 disposed in the snap-fit ​​groove 43. The limiting protrusion 44 extends along the axial direction of the receiving cavity 11. The snap-fit ​​protrusion 41 is provided with a limiting recess 45 that cooperates with the limiting protrusion 44, so that the snap-fit ​​protrusion 41 can pass through the limiting protrusion 44 and the limiting protrusion 44 and the limiting recess 45 cooperate.

[0051] Please refer to Figure 3 A limiting protrusion 44 extending along the axis is added in the snap-fit ​​groove 43 to allow the snap-fit ​​protrusion 41 to pass through and to make the limiting protrusion 44 and the limiting recess 45 cooperate. The limiting protrusion 44 will hinder the sliding path of the snap-fit ​​protrusion 41 to a certain extent and increase the assembly resistance. However, after the limiting protrusion 44 enters the limiting recess 45, it can form a limit to avoid misalignment caused by shaking after assembly and improve assembly reliability.

[0052] Please refer to Figure 3 For example, the limiting protrusion 44 can be a square block, a round block, or other shapes. Since there is a gap between the extension 31 and the base 1, the height of the limiting protrusion 44 needs to take into account both the gap and the depth of the snap-fit ​​recess along the direction perpendicular to the axis of the extension 31.

[0053] The limiting recess 45 should mate with the limiting protrusion 44, and after the limiting protrusion 44 is engaged with the limiting recess 45, the base 1 and the top cover 3 should abut together. The depth of the limiting recess 45 should be less than the height of the limiting protrusion 44 to facilitate the assembly of the limiting protrusion 44 and the limiting recess 45.

[0054] Please refer to Figure 3 In some examples, the contact portion between the limiting protrusion 44 and the locking groove 43 forms an arc surface. The arc surface design reduces the frictional resistance when the locking protrusion 41 slides over the limiting protrusion 44, making the circumferential rotation operation smoother, avoiding jamming caused by right angle or acute angle structures, reducing the force required during assembly, and improving the feel and efficiency of operation.

[0055] For example, the curvature of the arc surface can be selected as needed. The curvature at the connection between the limiting protrusion 44 and the snap-fit ​​groove 43 can be equal or unequal. The edge of the limiting recess 45 can also be provided with an arc surface to facilitate the cooperation between the limiting protrusion 44 and the limiting recess 45.

[0056] Alternatively, in some other examples, the arc surface of the contact portion between the limiting protrusion 44 and the snap-fit ​​groove 43 can be provided only on the side near the snap-fit ​​channel 42, thereby facilitating assembly only and reducing the risk of detachment between the snap-fit ​​protrusion 41 and the snap-fit ​​recess.

[0057] Please refer to Figure 3For example, the limiting protrusion 44 can be integrally formed with the structural part it is located in, that is, it can be directly formed when processing the snap-fit ​​groove 43; the limiting protrusion 44 can be set on the upper side or the lower side of the snap-fit ​​groove 43; there should be a space between the limiting protrusion 44 and the wall surface of the snap-fit ​​groove 43 away from the snap-fit ​​channel 42, and the space should be able to accommodate part of the snap-fit ​​protrusion 41 after the limiting recess 45 of the snap-fit ​​protrusion 41 is assembled with the limiting protrusion 44, so that the snap-fit ​​protrusion 41 can be stable.

[0058] Please refer to Figure 3 In some examples, the height of the limiting protrusion 44 along the axial direction of the receiving cavity 11 is 0.5mm to 3mm. The reasonable height allows the limiting protrusion 44 to effectively compress the engaging protrusion 41, avoiding structural deformation that could create new gaps, while also ensuring ease of assembly and dustproof performance.

[0059] For example, the height of the limiting protrusion 44 can be 0.5mm, 1mm, 2mm, 3mm, or other heights.

[0060] Please refer to Figure 3 In some examples, the snap-fit ​​protrusion 41 is formed on the inner wall surface of the extension 31 of the top cover 3, the snap-fit ​​recess is formed on the outer ring wall of the base 1, and the snap-fit ​​recess is set independently from the receiving cavity 11.

[0061] The distribution of protrusions and recesses conforms to operating habits, and the independent snap-fit ​​recess design avoids structural interference, simplifies the processing technology of base 1 and top cover 3, and indirectly reduces the difficulty of alignment during assembly. By optimizing the position and independence of protrusions and recesses, the assembly operation is simplified, and the dust prevention hazards that the snap-fit ​​structure may bring are solved from the root.

[0062] In other examples, the snap-fit ​​protrusion 41 may also be formed on the outer annular wall of the base 1, and the snap-fit ​​recess may be formed on the inner wall surface of the extension 31 of the top cover 3. This method can also achieve the above-mentioned effect.

[0063] Please refer to Figure 3 In some examples, the snap-fit ​​assembly 4 is configured in two sets, which are symmetrically arranged around the axis of the receiving cavity 11. The symmetrical distribution of the two sets reduces the number of snap-fit ​​assemblies 4, thereby reducing processing costs and alignment difficulties during assembly; the symmetrical structure makes the force more uniform during circumferential rotation, resulting in smoother operation and avoiding jamming caused by uneven force.

[0064] In some other examples, the two sets of snap-fit ​​components 4 may also be arranged non-centrally symmetrically around the axis of the receiving cavity 11. For example, the included angle between them may be other angles, such as 90°, so that they can rotate and coincide around the axis of the receiving cavity 11 and have a fixed installation fit. In this case, part of the wall surface of the extension 31 is in contact with the outer wall of the base 1.

[0065] In some other examples, the snap-fit ​​assembly 4 may also be configured as at least three sets, with the at least three sets of snap-fit ​​assemblies 4 circumferentially spaced around the axis of the receiving cavity 11.

[0066] Multiple positioning sets make the alignment of the top cover 3 and the base 1 more precise, reducing the risk of misalignment during assembly and indirectly improving assembly efficiency; the multi-point constraint formed by at least three sets of snap-fit ​​components 4 makes the fit between the top cover 3 and the base 1 tighter, and the circumferential gap more uniform and smaller; the multiple distribution sets can disperse the force and reduce gaps caused by local deformation. Especially in a vibration environment, it can maintain a more stable sealing state and has a better dustproof effect than two sets of components.

[0067] For example, the card-connecting component 4 can be configured as three, four, or six groups.

[0068] Please refer to Figure 3 In some examples, both the base 1 and the top cover 3 are made of rigid material. Rigid material is not easily deformed, which makes the mating dimensions of the snap-fit ​​protrusion 41 and the snap-fit ​​recess more stable, resulting in a more stable assembly effect.

[0069] In some examples, both the base 1 and the top cover 3 can be made of plastic, cast iron, or aluminum alloy.

[0070] Please refer to Figure 3 Since the base 1 and the top cover 3 are made of rigid materials, and the base 1 and the top cover 3 are sealed and fitted when the snap-fit ​​protrusion 41 is located in the snap-fit ​​groove 43, there is an interference fit when the snap-fit ​​protrusion 41 passes through the limiting protrusion 44. At this time, a large force can be applied by mechanical equipment to achieve installation, or cold assembly or other special assembly processes can be used to ensure that the deformation range of the snap-fit ​​protrusion 41 and the snap-fit ​​groove 43 is within an acceptable error range.

[0071] In some examples, the sensor assembly structure also includes a sealing layer disposed between the base 1 and the top cover 3. During assembly, the sealing layer is naturally compressed as the top cover 3 and the base 1 snap together, requiring no additional fixing steps and not increasing assembly complexity; at the same time, the elasticity of the sealing layer can compensate for minor dimensional errors, making the assembly more error-tolerant.

[0072] For example, the sealing layer can be one layer or two layers; the sealing layer can be formed on the top cover 3 or disposed at the opening 12 of the base 1. Alternatively, the contact portion of the top cover 3 and the base 1 can be provided with high-precision roughness and flatness so that the two surfaces fit together to achieve a direct mechanical sealing effect.

[0073] This application provides an embodiment 1, a sensor assembly structure, including a base 1, a PCB board and a sensing element 2, a top cover 3, a snap-fit ​​assembly 4 and a sealing layer.

[0074] The base 1 is injection molded from ABS engineering plastic and has a cylindrical receiving cavity 11 with a diameter of 30mm and a depth of 25mm. The receiving cavity 11 extends through the top of the base 1 to form an opening 12. The outer ring wall of the opening 12 is a cylindrical wall with a diameter of 35mm and a height of 5mm.

[0075] The PCB board uses an FR-4 epoxy resin glass cloth substrate, and the sensing element is an SHT30 temperature and humidity sensor chip, which is soldered to the center of the PCB board. The four terminals of the PCB board and the sensing element 2 extend to the outside of the base 1 through the through holes on the bottom wall plate of the base 1. The terminals are copper posts with a diameter of 1mm.

[0076] The top cover 3 is made of the same ABS engineering plastic as the base 1, and is circular with a diameter of 40mm and a thickness of 3mm. The wall surface of the top cover 3 that contacts the base 1 extends downward to form an extension 31. The extension 31 has a height of 5mm, an inner cylindrical wall with an inner diameter of 36mm, and forms a 0.5mm gap with the outer ring wall of the opening 12 of the base 1.

[0077] Two sets of snap-fit ​​components 4 are symmetrically distributed around the central axis of the receiving cavity 11. A snap-fit ​​protrusion 41 is formed on the inner wall of the extension 31 of the top cover 3, integrally injection molded with the top cover 3 using ABS engineering plastic. It has a semi-circular cross-section, a height of 2mm, and a width of 3mm. A limiting recess 45 is provided at the bottom of the snap-fit ​​protrusion 41, the depth of which is less than the height of the limiting protrusion 44.

[0078] The snap-fit ​​recess is formed on the outer ring wall of the base 1 and is not connected to the receiving cavity 11. The snap-fit ​​channel 42 of the snap-fit ​​recess is set in the vertical direction, with a width of 3.2 mm and a depth of 5 mm; the snap-fit ​​groove 43 is set at the bottom of the snap-fit ​​channel 42, extends in the horizontal direction, with a length of 4 mm and a width of 3.2 mm.

[0079] A limiting protrusion 44 is provided in the snap-fit ​​groove 43. The limiting protrusion 44 extends vertically and has a height of 1mm. The part of the protrusion 44 that contacts the snap-fit ​​groove 43 forms an arc surface with a radius of curvature of 1mm.

[0080] The sealing layer is an annular gasket made of nitrile rubber, with a diameter of 35mm and a cross-sectional diameter of 1mm. It is located at the top edge of the base 1 and is compressed by 0.3mm after the top cover 3 is assembled.

[0081] During assembly, align the extension 31 of the top cover 3 with the opening 12 of the base 1, align the snap-fit ​​protrusion 41 with the snap-fit ​​channel 42, apply axial force to make the snap-fit ​​protrusion 41 slide into the bottom along the snap-fit ​​channel 42, and then rotate the top cover 30° clockwise relative to the base 1 so that the limiting recess 45 of the snap-fit ​​protrusion 41 is assembled with the limiting protrusion 44, so that the snap-fit ​​protrusion 41 is fixed in the snap-fit ​​groove 43, and the assembly is completed.

[0082] This application provides a second embodiment of a sensor assembly structure, including a base 1, a PCB board and a sensing element 2, a top cover 3, a snap-fit ​​assembly 4 and a sealing layer.

[0083] The base 1 is made of 6061 aluminum alloy by die casting and has a rectangular cavity 11 with a length × width × height of 40mm × 30mm × 20mm. The cavity 11 extends through the top of the base 1 to form an opening 12. The outer ring wall of the opening 12 is a cylindrical wall with a diameter of 45mm and a height of 6mm.

[0084] The PCB board uses a CEM-1 composite substrate, and the sensing element is a Hall chip, which is soldered to one side of the PCB board. The three terminals of the PCB board and the sensing element 2 extend to the outside of the base 1 through the through holes on the bottom wall of the base 1. The terminals are copper posts with a diameter of 0.8mm.

[0085] The top cover 3 is made of the same 6061 aluminum alloy as the base 1, and is circular with a diameter of 50mm and a thickness of 4mm. The wall surface of the top cover 3 that contacts the base 1 extends downward to form an extension 31. The extension 31 is 6mm high, and its inner wall is cylindrical with an inner diameter of 46mm, forming a 0.5mm gap with the outer ring wall of the opening 12 of the base 1.

[0086] The snap-fit ​​assembly 4 is configured in three groups, distributed circumferentially at 120° intervals around the axis of the receiving cavity 11. The snap-fit ​​protrusion 41 is formed on the outer ring wall of the base 1, integrally die-cast from aluminum alloy with the base 1, with a rectangular cross-section, a height of 1.5mm, and a width of 2.5mm. The snap-fit ​​recess is formed on the inner wall surface of the extension 31 of the top cover 3. The snap-fit ​​channel 42 of the snap-fit ​​recess is set vertically, with a width of 2.7mm and a depth of 6mm; the snap-fit ​​groove 43 is located at the bottom of the snap-fit ​​channel 42, extending horizontally, with a length of 3.5mm and a width of 2.7mm.

[0087] A limiting protrusion 44 is provided within the snap-fit ​​groove 43. The limiting protrusion 44 extends vertically and has a height of 0.8 mm. The contact portion with the snap-fit ​​groove 43 forms an arc surface with a radius of curvature of 0.75 mm. A limiting recess 45 is formed at the bottom of the snap-fit ​​protrusion 41. The depth of the limiting recess 45 is 0.3 mm, and an arc surface with a radius of curvature of 0.75 mm is provided at the edge of the limiting recess 45.

[0088] The sealing layer is an annular gasket made of silicone rubber with a diameter of 45 mm and a cross-sectional diameter of 1.2 mm. It is located at the bottom edge of the extension 31 of the top cover 3 and is compressed by 0.4 mm after the top cover 3 is assembled.

[0089] During assembly, align the extension 31 of the top cover 3 with the opening 12 of the base 1, align the snap-fit ​​channel 42 of the snap-fit ​​recess with the snap-fit ​​protrusion 41, apply axial force to make the snap-fit ​​protrusion 41 slide into the bottom along the snap-fit ​​channel 42, and then rotate the top cover 3 counterclockwise by 20° relative to the base 1 so that the limiting recess 45 of the snap-fit ​​protrusion 41 is assembled with the limiting protrusion 44, so that the snap-fit ​​protrusion 41 is fixed in the snap-fit ​​groove 43, and the assembly is completed.

[0090] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0091] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A sensor assembly structure characterized by comprising: include: The base has a receiving cavity, which extends through the top of the base to form an opening, and the outer ring wall of the opening is a cylindrical wall surface; A PCB board and a sensing element are disposed within the receiving cavity. The terminals of the PCB board and the sensing element can pass through a side wall panel of the base away from the opening and extend to the outside of the base. The top cover abuts against the opening of the base. The wall of the top cover that contacts the base extends in the direction of the base to form an extension. The inner wall of the extension is cylindrical. A gap is provided between the inner wall of the extension and the outer ring wall where the opening is located. A snap-fit ​​assembly is disposed between the outer annular wall of the base and the inner wall of the extension. At least two sets of snap-fit ​​assemblies are provided, and these at least two sets are circumferentially spaced around the axis of the receiving cavity. The snap-fit ​​assembly includes a snap-fit ​​protrusion disposed on one of the inner walls of the base and the extension, and a snap-fit ​​recess disposed on the other of the inner walls of the base and the extension. The snap-fit ​​recess includes a snap-fit ​​channel along the axial direction of the receiving cavity, and a snap-fit ​​groove disposed at the bottom of the snap-fit ​​channel extending in a direction perpendicular to the axial direction of the receiving cavity. The snap-fit ​​protrusion can slide into the snap-fit ​​channel along the axial direction of the receiving cavity, and slide into the snap-fit ​​groove by the circumferential rotation between the base and the top cover about the axial direction of the receiving cavity.

2. The sensor assembly structure according to claim 1, characterized in that, The snap-fit ​​assembly further includes a limiting protrusion disposed in the snap-fit ​​groove. The limiting protrusion extends along the axial direction of the receiving cavity. The snap-fit ​​protrusion is provided with a limiting recess that cooperates with the limiting protrusion, so that the snap-fit ​​protrusion can pass through the limiting protrusion and the limiting protrusion and the limiting recess cooperate.

3. The sensor assembly structure according to claim 2, characterized in that, The contact portion between the limiting protrusion and the snap-fit ​​groove forms an arc surface.

4. The sensor assembly structure according to claim 2, characterized in that, Along the axial direction of the receiving cavity, the height of the limiting protrusion is 0.5mm to 3mm.

5. The sensor assembly structure according to any one of claims 1 to 4, characterized in that, The snap-fit ​​protrusion is formed on the inner wall surface of the extension of the top cover, the snap-fit ​​recess is formed on the outer ring wall of the base, and the snap-fit ​​recess is independently disposed from the receiving cavity.

6. The sensor assembly structure according to any one of claims 1 to 4, characterized in that, The snap-fit ​​assembly is configured in two sets, and the two sets of snap-fit ​​assemblies are symmetrically arranged around the axis of the receiving cavity.

7. The sensor assembly structure according to any one of claims 1 to 4, characterized in that, The snap-fit ​​assembly is configured as at least three sets, and the at least three sets of snap-fit ​​assemblies are circumferentially spaced around the axis of the receiving cavity.

8. The sensor assembly structure according to claim 1, characterized in that, Both the base and the top cover are made of rigid material.

9. The sensor assembly structure according to claim 1, characterized in that, The sensor assembly structure also includes a sealing layer, which is disposed between the base and the top cover.

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