A surface cover fixing structure and an infrared sensor

Abstract

This invention relates to a faceplate fixing structure and an infrared sensor, belonging to the field of infrared sensor technology. The faceplate fixing structure includes a faceplate with a support bracket; a lens front cover connected to the faceplate, the lens front cover including an annular groove and an annular slide rail, a second groove on one side of the annular groove, and a fourth plane on the side of the second groove opposite to the annular groove; the support bracket passes through the second groove and can abut against the annular slide rail; the support bracket can rotate around the central axis of the lens front cover within the annular groove, allowing the faceplate and lens front cover to be rotatably connected; and a base connected to the lens front cover, the base having a stop block inserted into the second groove, one side abutting against the fourth plane, and the other side abutting against the support bracket, preventing the faceplate from falling off. By rotating the faceplate, a knob is exposed in a window, allowing the operator to easily access the parameter adjustment components inside the sensor; the knob is covered inside the faceplate, ensuring the aesthetics of the device.

Description

Technical Field

[0001] This invention relates to a faceplate fixing structure and an infrared sensor, belonging to the field of infrared sensor technology. Background Technology

[0002] With the rapid development of technology, infrared sensors, as a core component in the field of photoelectric sensing, have been widely used in various technical fields such as security monitoring, industrial control, and smart homes due to their accurate detection characteristics of infrared radiation. They have become key devices for realizing automatic sensing, parameter monitoring, and signal feedback. The infrared sensor's cover, as its external key protective and auxiliary structure, not only protects the internal detection elements and isolates them from external dust, moisture, and other impurities, but also directly affects the sensor's ease of installation and parameter adjustment efficiency. The rationality of its fixing structure and the scientific nature of its structural design have a decisive impact on the overall working performance, operational stability, and service life of the infrared sensor.

[0003] Currently, the vast majority of infrared sensor covers on the market use a snap-on fixing structure. This structure is widely used in the manufacturing process of various infrared sensors due to its advantages such as simple structure, convenient assembly, no need for additional fasteners, and low production cost. However, the existing snap-on fixing structure has significant technical defects, making it difficult to meet the needs of actual application scenarios and limiting the application effect of infrared sensors.

[0004] On the one hand, the connection strength of the snap-fit ​​fastener is limited. The faceplate is only connected to the sensor body through snap-fit, resulting in poor connection stability. When subjected to external impact or pressure, the snap-fit ​​is prone to deformation, breakage, and other damage, leading to loosening or even detachment of the faceplate. Facing off not only exposes the internal sensitive detection elements directly to the external environment, making them susceptible to damage from dust, moisture, and corrosive substances, reducing the detection accuracy and lifespan of the infrared sensor, but also poses safety hazards due to exposed components. This is especially problematic in applications such as industrial control and security monitoring, where high equipment stability is required, directly affecting the normal operation of the entire sensing system and causing unnecessary losses.

[0005] On the other hand, most existing infrared sensors use a fixed, non-rotatable cover structure. During the installation and debugging phase of an infrared sensor, relevant parameters need to be adjusted according to the actual detection range, sensing sensitivity, and other requirements. The fixed cover makes it impossible for operators to easily access the parameter adjustment components inside the sensor. The cover must be removed to complete the parameter setting operation. This not only makes the operation process cumbersome and the debugging efficiency low, but also the repeated removal of the cover will further aggravate the wear of the clips, indirectly increasing the risk of the cover falling off and further reducing the reliability of the infrared sensor.

[0006] Therefore, there is an urgent need for a face cover that will not fall off and is easy to adjust, as well as an infrared sensor. Summary of the Invention

[0007] To address the aforementioned problems, this invention provides a faceplate fixing structure and an infrared sensor to prevent the faceplate from loosening or falling off under external force, and to facilitate operator adjustment of the knob.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a faceplate fixing structure, including... A face cover, wherein the face cover is provided with a support; A lens front cover is connected to the face cover. The lens front cover includes an annular groove and an annular slide rail. A second groove is provided on one side of the annular groove, and a fourth plane is provided on the side of the second groove opposite to the annular groove. The bracket passes through the second groove and can abut against the annular slide rail. The bracket rotates around the central axis of the lens front cover in the annular groove, so that the face cover and the lens front cover are rotatably connected. The base is connected to the lens front cover. The base is provided with a stop block, which is inserted into the second groove. One side of the stop block abuts against the fourth plane, and the other side abuts against the bracket to prevent the front cover from falling off.

[0009] In one embodiment of the present invention, the bracket includes a first groove, a first plane, and a third plane. The third plane abuts against the annular slide rail, and the first plane abuts against the stop block. A protrusion is provided on the annular slide rail, and the protrusion engages with the first groove. When the first groove on the bracket rotates to engage with the protrusion, the cover can be fixed in this position and will not easily rotate under no external force or with minimal force, thus preventing operator error.

[0010] In one embodiment of the present invention, the stop block is provided with a fifth plane and a sixth plane, the fifth plane abutting against the fourth plane, and the first plane being able to abut against the sixth plane by rotating the cover.

[0011] In one embodiment of the present invention, the face cover is provided with a buckle and a window, and the lens front cover is provided with a buckle ring groove, wherein the buckle is engaged with the buckle ring groove. Pre-assembly is achieved through the engagement of the buckle and the buckle ring groove, ensuring that the face cover and lens front cover will not temporarily detach, but can be separated under external force.

[0012] In one embodiment of the present invention, the lens front cover is provided with a foolproof protrusion, and the base is provided with a foolproof groove, the foolproof protrusion cooperating with the foolproof groove. This ensures that there is a unique mounting position between the lens front cover and the base.

[0013] In one embodiment of the present invention, the lens front cover is provided with a third groove, a first sealing member is installed in the third groove, and the base is provided with an annular boss, the first sealing member abutting against the annular boss; A drainage ring is provided around the periphery of the third groove, and at least one drainage hole is provided below the drainage ring. When the product is installed outdoors, rainwater will enter the product and accumulate at the bottom of the drainage ring. The accumulated water will be discharged through the drainage hole at the bottom to prevent water from entering the sensor and damaging the electronic components inside the sensor.

[0014] Secondly, the present invention also provides an infrared sensor that uses the aforementioned faceplate fixing structure, and further includes a knob, a lens, a lens rear cover, and a PCBA control board. The PCBA control board is mounted on the base, and the lens and lens rear cover are mounted between the lens front cover and the base.

[0015] In one embodiment of the present invention, the lens front cover includes a fourth groove, in which a second sealing member is installed, and the second sealing member abuts against the lens.

[0016] In one embodiment of the present invention, the lens front cover includes a first screw post and a second screw post, the lens rear cover is screwed into the first screw post through a first connector and connected to the lens front cover, and the base is screwed into the second screw post through a second connector and connected to the lens front cover.

[0017] In one embodiment of the present invention, the lens front cover is provided with a knob hole, and the knob is installed in the knob hole.

[0018] The beneficial effects of this invention are: The faceplate fixing structure and infrared sensor provided by this invention have the following advantages: 1. This invention provides a faceplate fixing structure. By setting an annular groove, an annular guide rail, a bracket, and a stop block, the bracket of the faceplate can rotate around the central axis of the lens front cover within the annular groove, thus rotatably connecting the faceplate to the lens front cover. By rotating the faceplate, the knob is exposed in the window, allowing the operator to easily access the parameter adjustment components inside the sensor and adjust the knob. After parameter adjustment, the faceplate is rotated until the protrusion mates with the first groove. This prevents the faceplate from easily detaching or loosening under external impact or pressure, and also covers the knob inside the faceplate, ensuring aesthetics and preventing the internal sensitive detection element from being directly exposed to the external environment, thus avoiding damage from dust, moisture, corrosive substances, etc., and extending the service life of the infrared sensor.

[0019] 2. The cover fixing structure is also equipped with multiple sealing components, as well as a drainage ring and drainage holes. When the product is installed outdoors, rainwater will enter the product and accumulate at the bottom of the drainage ring. The accumulated water will be discharged through the drainage holes at the bottom, preventing water from entering the sensor and damaging the electronic components inside the sensor. This effectively overcomes the problem of insufficient sealing of the infrared sensor protection structure in the existing technology, which allows rainwater and water vapor to easily seep into the device, thereby damaging the infrared sensitive element and internal circuit, causing the device to malfunction and the signal to drift, thus extending the service life of the infrared sensor.

[0020] 3. This cover fixing structure, by setting anti-misalignment bosses and anti-misalignment grooves, ensures a unique installation position between the base and the lens front cover, preventing damage to the PCBA control board due to misalignment during installation. Pre-installation is achieved through the cooperation of clips and clip ring grooves, preventing the cover from easily detaching from the lens front cover temporarily, but allowing them to be separated under external force. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 An exploded view of the infrared sensor provided by this invention.

[0023] Figure 2 A perspective view of the cover provided by the present invention.

[0024] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle.

[0025] Figure 4 for Figure 2A magnified view of a section at point B.

[0026] Figure 5 This is a perspective view of the cover provided by the present invention.

[0027] Figure 6 for Figure 5 A magnified view of a section at point C.

[0028] Figure 7 for Figure 5 A magnified view of a section at point D.

[0029] Figure 8 A perspective view of the lens front cover provided by the present invention.

[0030] Figure 9 for Figure 8 A magnified view of a section at point I.

[0031] Figure 10 for Figure 8 A magnified view of a section at point J.

[0032] Figure 11 This is a perspective view of the lens front cover provided by the present invention.

[0033] Figure 12 A perspective view of the base provided by the present invention.

[0034] Figure 13 for Figure 12 A magnified view of a section at point G.

[0035] Figure 14 for Figure 12 A magnified view of a section at point H.

[0036] Figure 15 This is a perspective view of the lens front cover and the face cover fitting together, as provided by the present invention.

[0037] Figure 16 for Figure 15 A magnified view of the area at point K.

[0038] Figure 17 This is a perspective view of the lens front cover and face cover in conjunction with the present invention.

[0039] Figure 18 for Figure 17 A magnified view of the area at point L.

[0040] Figure 19 This is a three-dimensional view of the infrared sensor provided by the present invention.

[0041] Figure 20 This is a perspective view of the lens front cover and face cover in conjunction with the present invention.

[0042] Figure 21 for Figure 20 A magnified view of a portion of point N in the middle.

[0043] Figure 22 A perspective view of the faceplate being opened according to the present invention.

[0044] Figure 23 A perspective view of the closed faceplate provided by the present invention.

[0045] In the diagram: 1. Front cover; 11. Bracket; 111. First groove; 112. First plane; 113. Second plane; 114. Third plane; 12. Window opening; 13. Buckle; 2. Lens front cover; 21. Gourd hole; 22. Anti-foolproof protrusion; 23. Drain ring; 24. Drain hole; 25. Buckle ring groove; 26. Protrusion; 27. Annular groove; 28. Second groove; 29. ​​Annular slide rail; 210. Fourth plane; 211. 212. Third groove; 213. Knob hole; 214. Fourth groove; 215. First screw post; 216. Second screw post; 3. Base; 31. Stop block; 317. Fifth plane; 318. Sixth plane; 32. Anti-fooling groove; 33. Annular boss; 4. Knob; 5. First seal; 6. Second seal; 8. Lens; 9. Lens back cover; 10. First connector; 14. PCBA control board; 15. Second connector. Detailed Implementation

[0046] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0047] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0048] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0049] like Figures 1 to 7 As shown, the present invention provides a faceplate fixing structure that is rotatable and allows for easy adjustment of the knob by the operator. The faceplate fixing structure includes a faceplate 1, a lens front cover 2, and a base 3. The faceplate 1 is connected to the lens front cover 2, and the lens front cover 2 is connected to the base 3. The faceplate 1 includes two supports 11, symmetrically arranged on the side of the faceplate 11 near the lens front cover 2. Each support 11 has an L-shaped structure, with a first groove 111 on the side perpendicular to the faceplate 11. The two sides of the first groove 111 on the support 11 are a first plane 112 and a second plane 113, respectively. The L-shaped head of the support 11 is perpendicular to the first groove 111, and a third plane 114 is provided on the side near the faceplate 1. The faceplate 1 also has several windows 12, evenly distributed in a ring on the faceplate 1. The buckle 13 is a long strip protrusion located on one side of the window hole 12 and corresponding to the window hole 12. The buckle 13 is snapped together with the lens front cover 2.

[0050] Specifically, in this embodiment, there are four window holes 12 and four buckles 13, which are evenly distributed around the circumference of the cover 1.

[0051] like Figures 8 to 11 , Figures 15 to 23 As shown, in some embodiments, a snap-fit ​​groove 25 is provided around the outer periphery of the lens front cover 2. The snap-fit ​​groove 25 is an elongated groove arranged in a ring on the lens front cover 2. The snap-fit ​​groove 25 cooperates with the snap fastener 13, which can be snapped into the snap-fit ​​groove 25 and rotatably connected with the snap-fit ​​groove 25. The face cover 1 and the lens front cover 2 can be pre-assembled by the cooperation of the snap fastener 13 and the snap-fit ​​groove 25, so that the face cover 1 and the lens front cover 2 will not fall off temporarily, but can be separated under the action of external force.

[0052] In some embodiments, the lens front cover 2 is provided with an annular groove 27, which is an arc-shaped groove centered on the center of the lens front cover 2. The bracket 11 can be inserted into the annular groove 27, allowing the cover 1 to rotate along the annular groove 27. One end of the annular groove 27 is provided with a second groove 28, and the side of the second mounting groove 28 opposite to the annular groove 27 is provided with a fourth plane 210. One side of the annular groove 27 is provided with an annular slide rail 29. The annular groove 27 and the annular slide rail 29 are circumferentially symmetrically arranged on the lens front cover 2, and their number is adapted according to the number of brackets 11. The side of the annular groove 27 opposite to the second groove 28 is provided with a protrusion 26, which is located on the side opposite to the annular slide rail 29. When the faceplate 1 is connected to the lens front cover 2, the faceplate 1 is moved toward the lens front cover 2, so that the two symmetrically arranged brackets 11 on the faceplate 1 pass through the second groove 28, which is also symmetrically arranged on the lens front cover 2, and the buckle 13 is engaged in the buckle ring groove 25. Then, the faceplate 1 is rotated clockwise by a certain angle so that the third plane 114 on the bracket 11 is located on one side of the annular slide rail 29 and can abut against the annular slide rail 29, so that the faceplate 1 can rotate freely around the central axis of the lens front cover 2 in the annular slide groove 27 through the bracket 11. When the first groove 111 on the bracket 11 rotates to engage with the protrusion 26, the faceplate 1 can be fixed in this position and will not easily rotate when there is no external force or when the force is small, thus avoiding operator misoperation.

[0053] In some embodiments, the lens front cover 2 is further provided with gourd holes 21 and anti-fooling protrusions 22. Multiple gourd holes 21 are arranged circumferentially on the lens front cover 2. By passing screws through the gourd holes 21, the infrared sensor can be fixed to the ceiling. The anti-fooling protrusions 22 are located on the side of the gourd holes 21 near the center of the lens front cover 2, and can cooperate with the base 3 to limit the position of the base 3, ensuring a unique installation position between the lens front cover 2 and the base 3. The lens front cover 2 is also provided with a third groove 211, and a drainage ring 23 is provided around the periphery of the third groove 211. Multiple drainage holes 24 are evenly distributed at the bottom of the drainage ring 23. When the product is installed outdoors, rainwater will enter the product and accumulate at the bottom of the drainage ring 23. The accumulated water will drain through the drainage holes 24 at the bottom, preventing water from entering the sensor and damaging the electronic components inside the sensor.

[0054] Specifically, in this embodiment, the drainage ring 23 has a V-shaped structure, which facilitates the collection of water from the infrared sensor.

[0055] like Figures 12 to 14 and Figure 19As shown, in some embodiments, the base 3 is provided with a stop block 31 and an annular boss 33. The stop blocks 31 are symmetrically arranged on the outside of the annular boss 33 of the base 3, and can cooperate with the second groove 28 in the lens front cover 2. The number of stop blocks 31 is adapted according to the number of second grooves 28. A fifth plane 311 and a sixth plane 312 are respectively provided on both sides of the stop block 31. The fifth plane 311 and the sixth plane 312 are parallel. A PCBA control board 14 is installed in the base 3. In order to prevent damage to the PCBA control board 14 when the base 3 is installed with the lens front cover 2, a foolproof groove 32 is provided on the base 3. Only one foolproof groove 32 and one foolproof boss 22 are provided. The foolproof groove 32 cooperates with the foolproof boss 22 to ensure that there is a unique and definite position between the base 3 and the lens front cover 2.

[0056] like Figures 15 to 18 As shown, in some embodiments, after the faceplate 1 is connected to the lens front cover 2, the bracket 11 is inserted into the second groove 28, and the bracket 11 is slightly smaller than the second groove 28. Then, the faceplate 1 is rotated clockwise, causing the bracket 11 to disengage from the second groove 28, and the third plane 114 abuts against the annular slide rail 29. Next, the base 3 is inserted into the lens front cover 2, and the stop block 31 is inserted into the second groove 28, with the fifth plane 311 abutting against the fourth plane 210. The sixth plane 312 of the stop block 31 is positioned in the middle of the second groove 28. When the faceplate 1 is rotated counterclockwise, the first plane 112 of the bracket 11 abuts against the sixth plane 312 of the stop block 31, thereby preventing the bracket 11 from dislodging from the second groove 28 during rotation. The faceplate 1 can rotate smoothly in the annular slide groove 27 via the bracket 11, and because the third plane 114 abuts against the annular slide rail 29, the faceplate 1 can be effectively fixed to the lens front cover 2 without falling off.

[0057] In some embodiments, the lens front cover 2 is also provided with a knob hole 212 for mounting a knob 4. A sealing ring is fitted around the outer periphery of the knob 4 to form a seal with the knob hole 212, preventing moisture from entering the interior of the infrared sensor. When the cover 1 is rotated clockwise, the protrusion 26 falls into the first groove 111, placing the cover 1 in a fixed position that will not easily rotate. At this time, the window 12 of the cover 1 is misaligned with the knob 4, and the cover 1 covers the knob 4, preventing accidental touch by the operator and improving the overall aesthetics. When parameter adjustment is required, simply rotate the cover 1 counterclockwise so that the first plane 112 abuts against the sixth plane 312 of the stop block 31. At this time, the knob 4 is exposed in the window 12, making it convenient for the installer to adjust or set parameters. At the same time, the gourd hole 21 is also exposed in the window 12, allowing the installer to use screws to fix the infrared sensor to the ceiling through the gourd hole 21.

[0058] Furthermore, the present invention also provides an infrared sensor, including the aforementioned faceplate fixing structure, and further including a lens 8 and a lens rear cover 9. The lens 8 and the lens rear cover 9 are sequentially installed between the lens front cover 2 and the base 3. The lens front cover 2 is also provided with a fourth groove 213, a first screw post 214, and a second screw post 215. A second sealing member 6 is installed in the fourth groove 213 of the lens front cover 2. A first connecting member 10 passes through a hole on the lens rear cover 9 and is screwed into the first screw post 214, so that the lens rear cover 9 and the lens 8 fit tightly together. The lens 8 abuts against the second sealing member 6 in the lens front cover 2, preventing moisture from entering the interior from the gap between the lens front cover 2 and the lens. A first sealing element 5 is installed in the third groove 211 of the lens front cover 2, and an annular boss 33 is provided in the base 3. A second connector 15 is screwed into the second screw post 215 through the hole on the base 3. The base 3 is connected to the lens front cover 2, so that the annular boss 33 abuts against the first sealing element 5, thereby preventing water from entering the interior from the outer ring of the third groove 211. This achieves waterproof protection for the infrared sensor, avoids rainwater or water vapor from entering the equipment, and prevents damage to the infrared sensitive element and internal circuit, which could cause equipment detection failure and signal drift, thus extending the service life of the infrared sensor.

[0059] Optionally, both the first sealing element 5 and the second sealing element 6 are sealing rings, which have strong sealing performance and are easy to install and disassemble. Through their own elasticity, they can compensate for processing errors, wear, and gaps to achieve overall sealing. The first connecting element 10 and the second connecting element 15 can be screws, which cooperate with screw posts to form a tight connection through the interlocking of the threads.

[0060] The present invention provides a faceplate fixing structure and the working principle of an infrared sensor: During installation, the two brackets 11 of the faceplate 1 are passed through the second groove 28 of the lens front cover 2. Simultaneously, the buckle 13 is engaged in the buckle ring groove 25, ensuring the faceplate 1 remains connected to the lens front cover 2 and will not detach without external force. The faceplate 1 is rotated clockwise by a certain angle so that the third plane 114 of the bracket 11 is positioned on one side of the annular slide rail 29 and abuts against it. The faceplate 1 can then rotate around the axis of the lens front cover 2 within the annular groove 27 via the bracket 11. The PCBA control board 14 is then installed in the base 3, and the interaction between the anti-foolproof boss 22 and the anti-foolproof groove 32 ensures a unique assembly position between the base 3 and the lens front cover 2. Next, the stop block 31 is inserted into the second groove 28, with the fifth plane 311 abutting against the fourth plane 210 and the sixth plane 312 located in the middle of the second groove 28. A fixed connection is formed with the lens front cover via the second connector 15, and a seal is formed by the first seal 5 and the second seal 6.

[0061] When the faceplate 1 is rotated clockwise, the protrusion 26 falls into the first groove 111, fixing the faceplate 1 in a fixed position and preventing it from rotating easily. At this time, the window 12 of the faceplate 1 is misaligned with the knob 4, and the faceplate 1 covers the knob 4 to prevent accidental operation and improve the overall aesthetics. When parameter adjustment is required, simply rotate the faceplate 1 counterclockwise so that the first plane 112 abuts against the sixth plane 312 of the stop block 31. At this time, the knob 4 is exposed in the window 12, making it easy for installers to adjust or set parameters. At the same time, the gourd hole 21 is also exposed in the window 12, allowing installers to use screws to fix the infrared sensor to the ceiling through the gourd hole 21.

[0062] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A faceplate fixing structure, characterized in that, include: A face cover (1) is provided with a bracket (11); A lens front cover (2) is connected to the face cover (1). The lens front cover (2) includes an annular groove (27) and an annular slide rail (29). A second groove (28) is provided on one side of the annular groove (27). A fourth plane (210) is provided on the side of the second groove (28) away from the annular groove (27). The bracket (11) passes through the second groove (28) and can abut against the annular slide rail (29). The bracket (11) can rotate around the central axis of the lens front cover (2) in the annular groove (27), so that the face cover (1) and the lens front cover (2) are rotatably connected. The base (3) is connected to the lens front cover (2). The base (3) is provided with a stop block (31). The stop block (31) is inserted into the second groove (28). One side abuts against the fourth plane (210), and the other side abuts against the bracket (11) to prevent the face cover (1) from falling off.

2. The faceplate fixing structure according to claim 1, characterized in that, The bracket (11) includes a first groove (111), a first plane (112) and a third plane (114). The third plane (114) abuts against the annular slide rail (29). The first plane (112) can abut against the stop block (31). The annular slide groove (27) is provided with a protrusion (26), which cooperates with the first groove (111).

3. The faceplate fixing structure according to claim 2, characterized in that, The stop block (31) is provided with a fifth plane (311) and a sixth plane (312). The fifth plane (311) abuts against the fourth plane (210), and the first plane (112) can abut against the sixth plane (312) by rotating the cover (1).

4. The faceplate fixing structure according to claim 1, characterized in that, The face cover (1) is provided with a buckle (13) and a window (12), and the lens front cover (2) is provided with a buckle ring groove (25). The buckle (13) is buckled to the buckle ring groove (25).

5. The faceplate fixing structure according to claim 1, characterized in that, The lens front cover (2) is provided with a foolproof protrusion (22), and the base (3) is provided with a foolproof groove (32). The foolproof protrusion (22) and the foolproof groove (32) cooperate with each other.

6. The faceplate fixing structure according to claim 1, characterized in that, The lens front cover (2) is provided with a third groove (211), and a first sealing element (5) is installed in the third groove (211). The base (3) is provided with an annular boss (33), and the first sealing element (5) abuts against the annular boss (33). A drainage ring (23) is provided around the periphery of the third groove (211), and at least one drainage hole (24) is provided below the drainage ring (23).

7. An infrared sensor, characterized in that, The cover fixing structure according to any one of claims 1-6 further includes a knob (4), a lens (8), a lens rear cover (9) and a PCBA control board (14), wherein the PCBA control board (14) is mounted on the base (3), and the lens (8) and the lens rear cover (9) are mounted between the lens front cover (2) and the base (3).

8. The infrared sensor according to claim 7, characterized in that, The lens front cover (2) includes a fourth groove (213), in which a second seal (6) is installed, and the second seal (6) abuts against the lens (8).

9. The infrared sensor according to claim 8, characterized in that, The lens front cover (2) includes a first screw post (214) and a second screw post (215). The lens rear cover (9) is screwed into the first screw post (214) through a first connector (10) and connected to the lens front cover (2). The base (3) is screwed into the second screw post (215) through a second connector (15) and connected to the lens front cover (2).

10. The infrared sensor according to claim 9, characterized in that, The lens front cover (2) is provided with a knob hole (212), and the knob (4) is installed in the knob hole (212).

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