Rainfall sensor

Abstract

The utility model relates to the field of rainfall sensors, in particular to a rainfall sensor, which comprises a sensor body, a connecting piece and a mounting seat, elastic arms are arranged on two sides of the connecting piece, and each elastic arm comprises a front section, a first bending part and a rear section which are connected in sequence; the mounting base is provided with two mounting notches which are oppositely arranged, the elastic arms penetrate through the mounting notches to abut against the inner side face of the mounting base, an abutting block and a driving assembly are arranged in the mounting base, the driving assembly drives the abutting block to move towards the rear section, and the driving assembly drives the abutting block to abut against the rear ends of the elastic arms. The top abutting block applies acting force towards the direction of the sensor body to the elastic arm, the direct contact tightness of the front end of the sensor body and the windshield is improved, the sensor body is prevented from shaking, the hierarchical structure of the silica gel layer of the sensor body is prevented from being affected, and the rainfall detection precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of rain gauge sensors, specifically to a rain gauge sensor. Background Technology

[0002] Rain gauges are important devices for measuring rainfall, and they are widely used in various fields such as meteorological observation, agricultural irrigation, hydrological monitoring, and urban drainage system management. Their core function is to accurately sense rainfall conditions and convert rainfall data into quantifiable and analyzable data.

[0003] Rain gauges primarily operate based on principles of optics, capacitance, and piezoelectricity. An optical rain gauge typically consists of a light source, a light receiver, and a signal processing circuit. When there is no rain, the light emitted from the light source is directly received by the light receiver; however, when it rains, raindrops scatter or absorb light, causing changes in the intensity of the light received by the receiver. The signal processing circuit then calculates the amount of rainfall based on these changes in light intensity. Optical rain gauges offer advantages such as fast response time, high measurement accuracy, and immunity to mechanical wear. They are mainly used in automotive windshields, working in conjunction with windshield wipers to automatically adjust the wiper's operating frequency.

[0004] For example, the invention patent with application number CN202010446445.8 entitled "An Invention Patent for a Vehicle Rain and Light Sensor" uses spring clips to support the sensor body and connects it to the rearview mirror through the openings at both ends of the spring clips. However, due to tolerances and other factors, gaps can easily exist between the connecting structures, so only the silicone layer plays a limiting role in supporting the sensor body. When the swaying inertia of the sensor body is greater than the binding force of the silicone layer, the sensor body shakes, causing the layer structure of the silicone layer to change. Some light cannot be totally reflected, affecting the accuracy of rain monitoring. Utility Model Content

[0005] The purpose of this invention is to provide a rain gauge sensor that improves the problem that the fixing structure of conventional sensor bodies has poor fixing effect, which causes changes in the layer structure of the silicone layer, resulting in some light not being able to undergo total reflection and affecting the accuracy of rain monitoring.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A rain gauge includes a sensor body, a connecting piece, and a mounting base;

[0008] The connecting piece is fixed to the bottom surface of the sensor body, and the top surface of the sensor body abuts against the top of the windshield. The connecting piece has elastic arms on both sides. The elastic arm includes a front section, a first bending section and a rear section connected in sequence. The front section extends away from the sensor body, and the rear section extends towards the sensor body. The end of the rear section extends to the side of the sensor body.

[0009] The mounting base has two oppositely arranged mounting notches. The elastic arms pass through the mounting notches and abut against each other with the inner side of the mounting base. The mounting base has two opposite abutting mechanisms. Each abutting mechanism includes an abutting block and a driving component. The front end faces of the two abutting blocks are opposite to the two rear sections. The driving end of the driving component is driven to be connected to the rear end face of the abutting block. The driving component drives the abutting block to move toward the rear section.

[0010] Furthermore, a positioning protrusion group is fixed on the bottom surface of the sensor body; a first groove group is provided on the top surface of the connecting piece, the bottom of the groove group protruding from the bottom surface of the connecting piece; a second groove group is provided on the outer side surface of the mounting base; the positioning protrusion group is embedded in the first groove group, and the bottom of the groove group is embedded in the second groove group.

[0011] Furthermore, the positioning protrusion group includes horizontal protrusions and vertical protrusions arranged opposite to each other in pairs; the first groove group includes a first horizontal groove and a first vertical groove arranged opposite to each other in pairs; and the second groove group includes a second horizontal groove and a second vertical groove arranged opposite to each other in pairs.

[0012] The second vertical groove is formed between the mounting notches, and the second horizontal groove is disposed opposite to the upper and lower sides of the mounting opening; the first horizontal groove and the horizontal protrusion are disposed opposite to the second horizontal groove, and the first vertical groove and the vertical protrusion are disposed opposite to the second vertical groove.

[0013] Furthermore, the bottom surface of the sensor body is provided with opposing limiting strips, which abut against the upper and lower sides of the connecting piece and extend outward to the upper and lower sides of the mounting base.

[0014] Furthermore, a positioning post is provided on the bottom surface of the sensor body, a positioning hole corresponding to the positioning post is provided on the connecting piece, a positioning groove corresponding to the positioning post is provided on the mounting base, and the end of the positioning post passes through the positioning hole and is embedded in the positioning groove.

[0015] Furthermore, the free end of the rear section is provided with a second bend, which bends toward the side away from the sensor body.

[0016] Furthermore, the drive assembly includes a drive block and a threaded drive rod. The mounting base has a threaded hole, and the threaded drive rod is threaded into the threaded hole. One end of the threaded drive rod is driven to the bottom of the drive block, and the side of the drive block is a drive surface.

[0017] The rear end face of the top block is a wedge-shaped surface, which slopes outward from its bottom end to its top end, and the driving surface is in contact with the wedge-shaped surface.

[0018] Furthermore, the mounting base is provided with a sliding guide rail, and the top block has sliding grooves on both sides, with the ends of the sliding guide rail embedded in the sliding grooves.

[0019] Furthermore, the sensor body includes an upper cover, a lower cover, a silicone layer, a circuit board, and a lens assembly;

[0020] The silicone layer is fixed to the top surface of the upper cover. The upper and lower covers enclose the circuit board and lens assembly. The inner edge of the lower cover is provided with a positioning block. The bottom of the circuit board is provided with a positioning notch corresponding to the positioning block. The positioning block is embedded in the positioning notch. The lens assembly is fixed to the inner top surface of the upper cover. The upper cover is provided with a propagation channel for light to pass through.

[0021] Furthermore, the circuit board is electrically connected to a pin assembly, which includes a mounting block and pins passing through the mounting block, with one end of each pin inserted into the circuit board.

[0022] The bottom ends of the mounting block are provided with downwardly extending limiting rods and limiting plates. The circuit board has limiting through holes and limiting notches. The limiting rods are inserted into the limiting through holes, and the limiting plates are embedded in the limiting notches.

[0023] By adopting the above technical solution, this utility model has the following advantages compared with the prior art:

[0024] 1. The two elastic arms are distributed in a "W" shape. In the free state, the ends of the elastic arms extend to the side of the sensor body. In the installed state, the two sides of the elastic arms pass through the mounting notch and enter the mounting base, and abut against each other with the inner side of the mounting base. The end face of the mounting base is in contact with the connecting piece, causing the elastic arms to bend backward. This ensures that the elastic arms and the mounting base exert a large interaction force on each other. The elastic arms transmit the force to the sensor body, applying a force towards the windshield to the sensor body. This ensures that the front end of the sensor body can be stably attached to the windshield, preventing the sensor body from shaking and affecting the layer structure of the silicone layer of the sensor body, thus improving the accuracy of rainfall detection.

[0025] 2. The driving component drives the top block and the rear end of the elastic arm to abut against each other, so that the top block applies a force to the elastic arm in the direction of the sensor body, further improving the tightness of the direct contact between the front end of the sensor body and the windshield, preventing the sensor body from shaking and affecting the layer structure of the silicone layer of the sensor body, and improving the accuracy of rainfall detection. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the rain sensor described in this utility model;

[0027] Figure 2 This is a schematic diagram of the rear structure of the rain sensor described in this utility model;

[0028] Figure 3 This is an exploded view of the rain sensor described in this utility model;

[0029] Figure 4 This is a schematic diagram of the sensor body structure of the rain gauge described in this utility model;

[0030] Figure 5 This is a schematic diagram of the mounting base structure for the rain sensor described in this utility model;

[0031] Figure 6 This is a schematic diagram of the top block structure of the rain sensor described in this utility model;

[0032] Figure 7 This is a schematic diagram of the lower cover structure of the rain sensor described in this utility model;

[0033] Figure 8 This is a schematic diagram of the circuit board structure of the rain sensor described in this utility model;

[0034] Figure 9 This is an exploded view of the circuit board structure of the rain sensor described in this utility model;

[0035] Figure 10 This is a schematic diagram of the connecting piece structure of the rain sensor described in this utility model.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Sensor body; 11. Silicone layer; 12. Top cover; 121. Slot; 122. Block; 123. Transmission channel; 13. Circuit board; 131. Positioning notch; 132. Limiting perforation; 133. Limiting notch; 134. Pin assembly; 1341. Pin; 1342. Mounting block; 1343. Limiting rod; 1344. Limiting plate; 14. Bottom cover; 141. Positioning protrusion group; 1411. Horizontal protrusion; 1412. Vertical protrusion; 142. Limiting strip; 143. Positioning post; 144. Snap ring; 145. Positioning block;

[0038] 2. Connecting piece; 21. Elastic arm; 211. Front section; 212. First bend; 213. Rear section; 214. Second bend; 22. First groove group; 221. First horizontal groove; 222. First vertical groove; 23. Positioning hole;

[0039] 3. Mounting base; 31. Mounting notch; 32. Top abutment mechanism; 321. Top abutment block; 3211. Angled wedge surface; 3212. Front end face; 3213. Slide groove; 322. Drive assembly; 3221. Drive block; 3222. Threaded drive rod; 33. Second groove group; 331. Second horizontal groove; 332. Second vertical groove; 34. Positioning groove; 35. Threaded hole; 36. Sliding guide rail. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0041] Additionally, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are all based on the orientation or positional relationship shown in the accompanying drawings. They are merely for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element of this utility model must have a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0042] When an element is referred to as being "fixed to," "set on," or "contained on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to," it can be directly connected to or indirectly connected to that other element.

[0043] Unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] Example

[0045] Please refer to Figure 1-10As shown, this embodiment provides a rain sensor, including a sensor body 1, a connecting piece 2, and a mounting base 3. The connecting piece 2 is fixed to the bottom surface of the sensor body 1, and the top surface of the sensor body 1 abuts against the top of the windshield. Elastic arms 21 are provided on both sides of the connecting piece 2. Each elastic arm 21 includes a front section 211, a first bent portion 212, and a rear section 213 connected in sequence. The front section 211 extends away from the sensor body 1, and the rear section 213 extends towards the sensor body 1, with its end extending to the side of the sensor body 1. Two opposing mounting notches 31 are provided on the mounting base 3, and the elastic arms 21 pass through the mounting notches 31 and abut against each other on the inner surface of the mounting base 3. Two opposing abutting mechanisms 32 are provided inside the mounting base 3. Each abutting mechanism 32 includes abutting blocks 321 and a driving assembly 322; the front end faces 3212 of the two abutting blocks 321 are opposite to the two rear sections 213. The driving end of the driving component 322 is driven to be connected to the rear end face of the top abutment block 321, and the driving component 322 drives the top abutment block 321 to move toward the rear section 213.

[0046] Two elastic arms 21 are distributed in a "W" shape. In the free state, the ends of the elastic arms 21 extend to the side of the sensor body 1. In the installed state, the two sides of the elastic arms 21 pass through the installation notch 31 and enter the mounting base 3, and abut against each other with the inner side of the mounting base 3. The end face of the mounting base 3 is in contact with the connecting piece 2, so that the elastic arms 21 bend backward, ensuring that the elastic arms 21 and the mounting base 3 exert a large interaction force on each other. The elastic arms 21 transmit the force to the sensor body 1, applying a force towards the windshield to the sensor body 1, ensuring that the front end of the sensor body 1 can be stably attached to the windshield, avoiding the sensor body 1 from shaking, affecting the layer structure of the silicone layer 11 of the sensor body 1, and improving the accuracy of rainfall detection.

[0047] Furthermore, the drive assembly 322 drives the abutment block 321 to abut against the rear end of the elastic arm 21, so that the abutment block 321 applies a force to the elastic arm 21 in the direction of the sensor body 1, further improving the tightness of the direct contact between the front end of the sensor body 1 and the windshield, preventing the sensor body 1 from shaking and affecting the layer structure of the silicone layer 11 of the sensor body 1, and improving the accuracy of rainfall detection.

[0048] Please refer to Figure 3 , Figure 7 and Figure 10As shown, a positioning protrusion group 141 is fixed on the bottom surface of the sensor body 1; a first recessed groove group 22 is provided on the top surface of the connecting piece 2, and the bottom of the groove group 22 protrudes from the bottom surface of the connecting piece 2; a second groove group 33 is provided on the outer side surface of the mounting base 3. The positioning protrusion group 141 is embedded in the first groove group 22, and the bottom of the groove group 22 is embedded in the second groove group 33. The sensor body 1, the connecting piece 2, and the mounting base 3 are interlocked through the positioning protrusion group 141, the first groove group 22, and the second groove group 33, forming a continuous limiting structure to further prevent the sensor body 1 from shifting position.

[0049] Specifically, the positioning protrusion group 141 includes two horizontal protrusions 1411 and two vertical protrusions 1412 arranged opposite to each other; the first groove group 22 includes two first horizontal grooves 221 and two first vertical grooves arranged opposite to each other; and the second groove group 33 includes two second horizontal grooves 331 and two vertical grooves 332 arranged opposite to each other. The second vertical groove 332 is formed between the mounting notches 31, and the second horizontal grooves 331 are arranged opposite to each other on the upper and lower sides of the mounting opening. The first horizontal groove 221 and the horizontal protrusions 1411 are both arranged opposite to the second horizontal grooves 331, and the first vertical grooves and the vertical protrusions 1412 are both arranged opposite to the second vertical grooves 332. By fully utilizing the surface space of the mounting base 3, the connecting piece 2, and the sensor body 1, an "I"-shaped limiting structure is formed, reducing the size of the limiting structure, thereby reducing the size of the connecting piece 2 and the sensor body 1. At the same time, a limiting force is formed in the horizontal and vertical directions on the sensor body 1, further improving the stability of the sensor body 1.

[0050] The bottom surface of the sensor body 1 is provided with opposing limiting strips 142. The limiting strips 142 abut against the upper and lower sides of the connecting piece 2 and extend outward to the upper and lower sides of the mounting base 3. The limiting strips 142 abut against and limit the sides of the connecting piece 2 and the mounting base 3 on both sides, ensuring the accuracy of the installation position of the connecting piece 2 and the mounting base 3, and providing support for the sensor body 1, thereby reducing the force on the silicone layer 11 of the sensor body 1.

[0051] The bottom surface of the sensor body 1 is provided with positioning posts 143, the connecting piece 2 is provided with positioning holes 23 corresponding to the positioning posts 143, and the mounting base 3 is provided with positioning grooves 34 corresponding to the positioning posts 143. The end of the positioning post 143 passes through the positioning hole 23 and is embedded in the positioning groove 34. In this embodiment, there are four positioning posts 143, which are distributed around the bottom surface. The connecting piece 2 and the mounting base 3 generate multiple reaction forces on the sensor body 1 to prevent the sensor body 1 from deflecting.

[0052] In this embodiment, the free end of the rear section 213 is provided with a second bending portion 214, which bends away from the sensor body 1. The second bending portion 214 abuts against the inner side of the mounting base 3, and the elastic arm 21 makes curved contact with the inner side, reducing the friction between the elastic arm 21 and the mounting base 3, ensuring that the elastic arm 21 can bend better and transmit the force to the sensor body 1.

[0053] Please refer to Figure 2 As shown, specifically, the drive assembly 322 includes a drive block 3221 and a threaded drive rod 3222. A threaded hole 35 is provided on the mounting base 3, and the threaded drive rod 3222 is threadedly connected to the threaded hole 35. One end of the threaded drive rod 3222 is drivenly connected to the bottom of the drive block 3221. The side surface of the drive block 3221 is a drive surface; the rear end surface of the abutment block 321 is a wedge-shaped surface 3211, which slopes outward from its bottom end to its top end. The drive surface and the wedge-shaped surface 3211 are in close contact. In this embodiment, an internal threaded channel is provided between the top and bottom surfaces of the drive block 3221. The top end of the threaded drive rod 3222 is threadedly connected to the internal threaded channel. Rotating the threaded drive rod 3222 causes the drive block 3221 to move upward under the drive of the threaded drive rod 3222. The drive block 3221 drives the abutment block 321 to move towards the rear section 213 via the wedge-shaped surface 3211. The drive block 3221 limits the position of the abutment block 321 at its rear end, causing the abutment block 321 and the rear section 213 to abut against each other, providing a stable thrust for the sensor assembly. Similarly, the top end of the threaded drive rod 3222 can also be rotatably connected to the bottom surface of the drive block 3221 via a rotating shaft, thereby driving the drive block 3221 to rise and fall by raising and lowering the threaded drive rod 3222.

[0054] Please refer to Figure 5 and Figure 6 As shown, the mounting base 3 is further provided with a sliding guide rail, and the top block 321 has grooves 3213 on both sides, with the ends of the sliding guide rail embedded in the grooves 3213. The sliding guide rail guides the top block 321 to ensure the accuracy of the movement path of the top block 321; at the same time, it provides limiting force on both sides of the top block 321 to prevent deflection under the reaction force of the rear section 213, which would affect the mutual abutment between the top block 321 and the rear section 213.

[0055] Please refer to Figure 2As shown, the sensor body 1 includes an upper cover 12, a lower cover 14, a silicone layer 11, a circuit board 13, and a lens assembly (not shown in the attached figure). In this embodiment, the positioning protrusion group 141, the positioning post 143, and the limiting strip 142 are all disposed on the bottom surface of the lower cover 14. The silicone layer 11 is fixed to the top surface of the upper cover 12. The upper cover 12 and the lower cover 14 enclose the circuit board 13 and the lens assembly. In this embodiment, the top of the lower cover 14 is provided with an upwardly extending retaining ring 144, and the outer side of the upper cover 12 is provided with a retaining groove 121. A retaining block 122 is provided in the retaining groove 121. The retaining block 122 is embedded in the retaining groove 121 and engages with the retaining block 122 to realize the detachable connection of the upper cover 12 and the lower cover 14. A positioning block 145 is provided on the inner edge of the lower cover 14, and a positioning notch 131 corresponding to the positioning block 145 is provided on the bottom of the circuit board 13. The positioning block 145 is embedded in the positioning notch 131. The positioning block 145 and the positioning notch 131 cooperate to provide circumferential limiting force on the circuit board 13, preventing the circuit board 13 from deflecting and affecting the relationship between the infrared emitting and receiving parts and the lens assembly on the circuit board 13. The lens assembly is fixed to the inner top surface of the upper cover 12, and the upper cover 12 has a propagation channel 123 for light to pass through. The infrared emitting part on the circuit board 13 emits light, which passes through the lens assembly and the silicone layer 11, undergoes total internal reflection on the windshield, and then passes through the silicone layer 11 and the lens assembly again to return to the infrared receiving part. By identifying the intensity of the received light, the amount of rainfall is determined.

[0056] Please refer to Figure 8 and Figure 9 As shown, furthermore, a pin assembly 134 is electrically connected to the circuit board 13. The pin assembly 134 includes a mounting block 1342 and pins 1341 passing through the mounting block 1342. One end of the pin 1341 is inserted into the circuit board 13. The bottom ends of the mounting block 1342 are provided with downwardly extending limiting rods 1343 and limiting plates 1344. The circuit board 13 has limiting holes 132 and limiting notches 133. The limiting rods 1343 pass through the limiting holes 132, and the limiting plates 1344 are embedded in the limiting notches 133. The mounting block 1342 abuts against the circuit board 13 on both sides through the limiting rods 1343 and the limiting plates 1344, thereby limiting the mounting block 1342 and preventing the pins 1341 from shaking during operation, which would affect the transmission of optical signal reception.

[0057] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A rain gauge, characterized in that, Includes the sensor body, connecting piece, and mounting base; The connecting piece is fixed to the bottom surface of the sensor body, and the top surface of the sensor body abuts against the top of the windshield. The connecting piece has elastic arms on both sides. The elastic arm includes a front section, a first bending section and a rear section connected in sequence. The front section extends away from the sensor body, and the rear section extends towards the sensor body. The end of the rear section extends to the side of the sensor body. The mounting base has two oppositely arranged mounting notches. The elastic arms pass through the mounting notches and abut against each other with the inner side of the mounting base. The mounting base has two opposite abutting mechanisms. Each abutting mechanism includes an abutting block and a driving component. The front end faces of the two abutting blocks are opposite to the two rear sections. The driving end of the driving component is driven to be connected to the rear end face of the abutting block. The driving component drives the abutting block to move toward the rear section.

2. The rain sensor according to claim 1, characterized in that: A positioning protrusion group is fixed on the bottom surface of the sensor body; a first groove group is provided on the top surface of the connecting piece, the bottom of the groove group protruding from the bottom surface of the connecting piece; a second groove group is provided on the outer side surface of the mounting base; the positioning protrusion group is embedded in the first groove group, and the bottom of the groove group is embedded in the second groove group.

3. The rain sensor according to claim 2, characterized in that: The positioning protrusion group includes two horizontal protrusions and two vertical protrusions arranged opposite each other; the first groove group includes two horizontal grooves and two vertical grooves arranged opposite each other; and the second groove group includes two horizontal grooves and two vertical grooves arranged opposite each other. The second vertical groove is formed between the mounting notches, and the second horizontal groove is disposed opposite to the upper and lower sides of the mounting opening; the first horizontal groove and the horizontal protrusion are disposed opposite to the second horizontal groove, and the first vertical groove and the vertical protrusion are disposed opposite to the second vertical groove.

4. The rain sensor according to claim 1, characterized in that: The bottom surface of the sensor body is provided with opposing limiting strips. The limiting strips abut against the upper and lower sides of the connecting piece and extend outward to the upper and lower sides of the mounting base.

5. The rain sensor according to claim 1, characterized in that: The bottom surface of the sensor body is provided with a positioning post, the connecting piece is provided with a positioning hole corresponding to the positioning post, the mounting base is provided with a positioning groove corresponding to the positioning post, and the end of the positioning post passes through the positioning hole and is embedded in the positioning groove.

6. The rain sensor according to claim 1, characterized in that: The free end of the rear section is provided with a second bend, which bends toward the side away from the sensor body.

7. The rain sensor according to claim 1, characterized in that: The drive assembly includes a drive block and a threaded drive rod. The mounting base has a threaded hole, and the threaded drive rod is threaded into the threaded hole. One end of the threaded drive rod is driven to the bottom of the drive block, and the side of the drive block is a drive surface. The rear end face of the top block is a wedge-shaped surface, which slopes outward from its bottom end to its top end, and the driving surface is in contact with the wedge-shaped surface.

8. The rain sensor according to claim 1, characterized in that: The mounting base is provided with a sliding guide rail, and the top block has sliding grooves on both sides, with the ends of the sliding guide rail embedded in the sliding grooves.

9. The rain sensor according to claim 1, characterized in that: The sensor body includes an upper cover, a lower cover, a silicone layer, a circuit board, and a lens assembly; The silicone layer is fixed to the top surface of the upper cover. The upper and lower covers enclose the circuit board and lens assembly. The inner edge of the lower cover is provided with a positioning block. The bottom of the circuit board is provided with a positioning notch corresponding to the positioning block. The positioning block is embedded in the positioning notch. The lens assembly is fixed to the inner top surface of the upper cover. The upper cover is provided with a propagation channel for light to pass through.

10. The rain sensor according to claim 9, characterized in that: The circuit board is electrically connected to a pin assembly, which includes a mounting block and pins passing through the mounting block, with one end of each pin inserted into the circuit board. The bottom ends of the mounting block are provided with downwardly extending limiting rods and limiting plates. The circuit board has limiting through holes and limiting notches. The limiting rods are inserted into the limiting through holes, and the limiting plates are embedded in the limiting notches.

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