Waterproof pyroelectric sensor

Abstract

The utility model provides a waterproof pyroelectric sensor, which comprises a base, a Fresnel lens, an upper cover, a PCB (printed circuit board), a power board and a waterproof assembly, the upper cover is mounted on the base, a through hole for mounting the Fresnel lens is formed in the upper cover, a fixing assembly for fixing the Fresnel lens is arranged at the position of the through hole, and the fixing assembly is arranged on the base. The waterproof assembly comprises a first sealing ring arranged at the joint of the upper cover and the base and a second sealing ring arranged at the joint of the through hole and the Fresnel lens. The waterproof function at the joint of the base and the upper cover can be realized through the first sealing ring, so that liquid is difficult to enter the base from the bottom of the upper cover, and the waterproof function at the through hole is realized through the second sealing ring, so that the liquid cannot enter the upper cover from the Fresnel lens at the through hole; therefore, the safety of electronic components in the base is ensured, a dual waterproof function is realized, and the sensor can be suitable for a relatively humid environment.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor equipment, in particular to a waterproof pyroelectric sensor. Background Art

[0002] A pyroelectric sensor is a precision sensor that can detect infrared rays emitted by humans or animals and output electrical signals. Pyroelectric infrared sensors are not affected by day or night and can be used for monitoring day and night. They are widely used in anti-theft alarms, induction lights and other fields, making pyroelectric sensors applicable to a variety of scenarios.

[0003] At present, Chinese patent publication number CN220380621U discloses a precision pyroelectric sensor, including a sensor body, the outer side of the sensor body is provided with a connecting ring, the outer side of the connecting ring is interspersed with a plurality of moving rods, the other end of the moving rod is fixedly connected with a rebound component for driving the moving rod, the rebound component includes an elastic ring, and the outer side of the elastic ring is provided with a shielding component for passing infrared rays.

[0004] Although this precision pyroelectric sensor can fix the Fresnel lens more firmly, due to the wide range of usage scenarios of pyroelectric sensors, when used in humid environments, the existing pyroelectric sensors have poor waterproof performance. After long-term use, water vapor will penetrate into the interior of the device and cause damage to the electronic components within the device, affecting the service life of the device. Utility Model Content

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a waterproof pyroelectric sensor to solve the problem of poor waterproof performance of the sensor in the prior art.

[0006] To achieve the above-mentioned purpose and other related purposes, the utility model provides a waterproof pyroelectric sensor, including a base, a Fresnel lens, an upper cover, a PCB board, a power board, and a waterproof component. The upper cover is installed on the base, and the upper cover has a through hole for installing the Fresnel lens. A fixing component for fixing the Fresnel lens is arranged at the through hole. The waterproof component includes a first sealing ring arranged at the connection between the upper cover and the base, and a second sealing ring arranged at the connection between the through hole and the Fresnel lens.

[0007] By adopting the above technical scheme, the waterproof function of the connection between the base and the upper cover can be achieved through the first sealing ring, so that it is difficult for liquid to enter the base from the bottom of the upper cover. The waterproof function of the through hole is achieved through the second sealing ring, so that liquid will not enter the upper cover from the Fresnel lens at the through hole, thereby ensuring the safety of the electronic components inside the base, achieving double waterproof function, and enabling the sensor to be suitable for relatively humid environments.

[0008] In one embodiment of the utility model, the fixing assembly includes a fixing bracket installed on the upper cover, a mounting groove provided on the fixing bracket for installing the Fresnel lens, and a fixing plate provided on the fixing bracket for fixing the Fresnel lens, wherein the upper side of the fixing plate is in contact with the inner wall of the upper cover, and the lower side of the fixing plate is in contact with the fixing bracket.

[0009] By adopting the above technical solution, the Fresnel lens can be fixedly installed at the through hole by means of the fixing bracket and the fixing plate. The installation method is simple and convenient, and the fixing plate is used to limit and position the Fresnel lens to make it more stable.

[0010] In one embodiment of the utility model, a plurality of arc-shaped limit plates are arranged on the inner wall of the upper cover, and the arc-shaped limit plates are evenly arranged around the axis of the upper cover. The arc-shaped limit plates and the inner wall of the upper cover form a sealing groove for placing a second sealing ring. The sealing groove is located on the upper side of the fixed plate, and the second sealing ring is in contact with the fixed plate.

[0011] By adopting the above technical solution, a sealing groove is formed by cooperating with the arc-shaped limiting plate and the inner wall of the upper cover, which makes it easier to install the second sealing ring, and the waterproof performance can be improved through the cooperation of the sealing groove.

[0012] In one embodiment of the present invention, the upper cover is sleeved outside the base, and the upper cover and the base are threadedly matched, the first sealing ring is sleeved outside the base, and the first sealing ring is abuttingly connected to the bottom of the upper cover.

[0013] By adopting the above technical solution, the waterproofness of the upper cover and the base can be improved through the threaded cooperation of the upper cover and the base, and the waterproof performance can be further improved by cooperating with the first sealing ring.

[0014] In one embodiment of the present invention, the fixing bracket is fixedly connected to the inner wall of the upper end of the upper cover by a fastener, and the fixing leg has a positioning groove adapted to the fixing plate.

[0015] By adopting the above technical solution, the installation and positioning of the fixing plate can be more convenient through the positioning groove, and the installation of the fixing plate can be convenient through the fastener.

[0016] In an embodiment of the present invention, the fixing plate is tempered glass.

[0017] In one embodiment of the utility model, a waterproof gland is further provided on the side wall of the base, and an internal thread is provided at the connection between the base and the waterproof gland, and the waterproof gland cooperates with the base thread.

[0018] By adopting the above technical solution, the waterproof performance can be further improved through the waterproof gland.

[0019] As described above, the waterproof pyroelectric sensor of the utility model has the following beneficial effects: the waterproof function of the connection between the base and the upper cover can be achieved through the first sealing ring, making it difficult for liquid to enter the base from the bottom of the upper cover, and the waterproof function of the through hole can be achieved through the second sealing ring, so that the liquid will not enter the upper cover from the Fresnel lens at the through hole, thereby ensuring the safety of the electronic components inside the base, achieving double waterproof function, and enabling the sensor to be suitable for relatively humid environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Shown is a schematic diagram of the overall structure disclosed in the embodiment of the utility model;

[0021] Figure 2 Shown is a cross-sectional view of the entirety disclosed in the embodiment of the utility model;

[0022] Figure 3 Shown is a schematic diagram of the structure of the fixing plate disclosed in the embodiment of the utility model;

[0023] Component number description

[0024] 1. Base; 2. PCB board; 3. Power board; 4. Upper cover; 5. Fresnel lens; 6. Waterproof assembly; 7. First sealing ring; 8. Second sealing ring; 9. Fixing assembly; 10. Fixing bracket; 11. Mounting groove; 12. Fixing plate; 13. Positioning groove; 14. Arc limit plate; 15. Sealing groove; 16. Waterproof cable gland. DETAILED DESCRIPTION

[0025] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0026] See also Figures 1 to 3 It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change in the proportion relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantially changing the technical content.

[0027] like Figure 1, Figure 2 As shown, the utility model provides a waterproof pyroelectric sensor, including a base, a PCB board and a power board arranged in the base, an upper cover is also arranged on the base, the upper cover is sleeved outside the base, a Fresnel lens matching with the PCB board is arranged on the upper cover, a through hole is arranged at the center of the upper cover, the PCB board and the power board are both installed at the center of the base, and the upper cover and the base are arranged in a cylindrical shape corresponding to each other.

[0028] It also includes a waterproof component for preventing liquid from entering the base, and the waterproof component includes a first sealing ring arranged at the connection between the upper cover and the base and a second sealing ring arranged at the connection between the through hole and the Fresnel lens.

[0029] A fixing assembly is also provided at the through hole, and the Fresnel lens is installed at the through hole of the upper cover through the fixing assembly. The fixing assembly includes a fixing bracket installed on the upper cover, a mounting groove provided on the fixing bracket for installing the Fresnel lens, and a fixing plate provided on the fixing bracket for fixing the Fresnel lens.

[0030] like Figure 3 As shown, the fixing plate is tempered glass, the fixing plate is arranged in a ring shape, and is sleeved on the outside of the Fresnel lens, the upper side of the fixing plate is in contact with the inner wall of the upper cover, and the lower side of the fixing plate is in contact with the fixing bracket, and the fixing bracket has a positioning groove adapted to the fixing plate, the fixing plate is arranged in the positioning groove, the positioning groove is arranged around the mounting groove, and the depth of the positioning groove is less than the depth of the mounting groove.

[0031] A plurality of arc-shaped limit plates are arranged on the inner wall of the upper cover, and the arc-shaped limit plates are evenly arranged around the axis of the upper cover. The arc-shaped limit plates and the inner wall of the upper cover form a sealing groove for placing the second sealing ring. The sealing groove is located on the upper side of the fixed plate, and the second sealing ring is in contact with the fixed plate.

[0032] The upper cover is sleeved outside the base, and the upper cover and the base are threadedly matched. The first sealing ring is sleeved outside the base, and the first sealing ring is in contact with the bottom of the upper cover.

[0033] A waterproof gland is also arranged on the side wall of the base, and an internal thread is arranged at the connection between the base and the waterproof gland, and the waterproof gland cooperates with the base thread.

[0034] To sum up, the utility model can achieve a waterproof function at the connection between the base and the upper cover through the first sealing ring, making it difficult for liquid to enter the base from the bottom of the upper cover, and then achieve a waterproof function at the through hole through the second sealing ring, so that liquid will not enter the upper cover from the Fresnel lens at the through hole, thereby ensuring the safety of the electronic components inside the base, achieving double waterproof function, and enabling the sensor to be suitable for relatively humid environments.

[0035] Therefore, the utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0036] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A waterproof pyroelectric sensor, characterized in that: The invention comprises a base, a Fresnel lens, an upper cover, a PCB board, a power board and a waterproof component. The upper cover is installed on the base. The upper cover has a through hole for installing the Fresnel lens. A fixing component for fixing the Fresnel lens is arranged at the through hole. The waterproof component comprises a first sealing ring arranged at the connection between the upper cover and the base and a second sealing ring arranged at the connection between the through hole and the Fresnel lens.

2. The waterproof pyroelectric sensor according to claim 1, characterized in that: The fixing assembly includes a fixing bracket installed on the upper cover, a mounting groove arranged on the fixing bracket for installing the Fresnel lens, and a fixing plate arranged on the fixing bracket for fixing the Fresnel lens, the upper side of the fixing plate is in contact with the inner wall of the upper cover, and the lower side of the fixing plate is in contact with the fixing bracket.

3. The waterproof pyroelectric sensor according to claim 2, characterized in that: The inner wall of the upper cover is provided with a plurality of arc-shaped limit plates, which are evenly arranged around the axis of the upper cover. The arc-shaped limit plates and the inner wall of the upper cover form a sealing groove for placing a second sealing ring. The sealing groove is located on the upper side of the fixed plate, and the second sealing ring is in contact with the fixed plate.

4. The waterproof pyroelectric sensor according to claim 1, characterized in that: The upper cover is sleeved outside the base, and the upper cover and the base are threadedly matched. The first sealing ring is sleeved outside the base, and the first sealing ring is in contact with the bottom of the upper cover.

5. The waterproof pyroelectric sensor according to claim 2, characterized in that: The fixing bracket is fixedly connected to the inner wall of the upper end of the upper cover through a fastener, and the fixing bracket is provided with a positioning groove adapted to the fixing plate.

6. The waterproof pyroelectric sensor according to claim 2, characterized in that: The fixing plate is made of tempered glass.

7. The waterproof pyroelectric sensor according to claim 1, characterized in that: A waterproof gland is also provided on the side wall of the base, and an internal thread is provided at the connection between the base and the waterproof gland, and the waterproof gland is matched with the base thread.

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