Pyroelectric infrared sensor

Abstract

The utility model relates to the technical field of inductors, and discloses a pyroelectric infrared inductor which comprises a lower cover, a middle cover and an upper cover, a plurality of positioning blocks are fixedly connected to the inner bottom wall of the lower cover, a PCB substrate is arranged on the upper end faces of the positioning blocks, a wiring terminal, a pyroelectric sensor and a relay are fixedly installed on the upper end face of the PCB substrate respectively, and the upper end face of the PCB substrate is fixedly connected with the middle cover. The upper end face of the middle cover is fixedly connected with a Fresnel lens, the inner bottom wall of the lower cover is provided with a wire outlet hole for a power line to penetrate through, the middle cover is provided with an auxiliary fixing assembly for fixing the power line, and the end of the power line is tightly fixed through the arranged auxiliary fixing assembly. The power line is prevented from being accidentally separated from the wiring terminal due to external pulling force in the using process, so that stable connection between the power line and the wiring terminal is kept, continuous and reliable operation of the inductor is ensured, and internal devices can be easily replaced or maintained without a complicated disassembling process among the upper cover, the middle cover and the lower cover.

Description

Technical Field

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

[0002] A pyroelectric infrared sensor, also known as a pyroelectric infrared sensor or pyroelectric infrared sensor, is a sensor that detects infrared radiation emitted by humans or animals and outputs an electrical signal. The operating principle of a pyroelectric infrared sensor is based on the pyroelectric effect, which states that when the temperature of certain crystals changes, the centers of positive and negative charges within them shift relative to each other, generating a potential difference or current. When infrared light strikes the sensor's sensing element (pyroelectric detector), it absorbs the infrared radiation and experiences a slight temperature change. This temperature change redistributes the positive and negative charges within the pyroelectric material, creating a potential difference across the sensing element and, in turn, generating a pyroelectric current.

[0003] Existing devices have some disadvantages during use. For example, traditional pyroelectric infrared sensors do not protect the connection between the power supply cord and the terminal block. The power supply cord may accidentally detach from the terminal block due to external pulling force or vibration, making it difficult to ensure the continued reliable operation of the sensor. In addition, the traditional sensor disassembly process may involve multiple screws, clips and other fixings, making the disassembly and installation process cumbersome and time-consuming. Utility Model Content

[0004] The purpose of the utility model is to provide a pyroelectric infrared sensor to solve the problem that the pyroelectric infrared sensor does not protect the connection between the power supply line and the terminal, and the power supply line is accidentally separated from the terminal due to external pulling force or vibration, making it difficult to ensure the continuous and reliable operation of the sensor.

[0005] The utility model provides the following technical solution: a pyroelectric infrared sensor, comprising a lower cover, a middle cover and an upper cover, wherein a plurality of positioning blocks are fixedly connected to the inner bottom wall of the lower cover, a PCB substrate is provided on the upper end surfaces of the plurality of positioning blocks, a wiring terminal, a pyroelectric sensor and a relay are respectively fixedly mounted on the upper end surfaces of the PCB substrate, the lower cover and the middle cover are fixed by snapping, the middle cover and the upper cover are detachably fixed, a Fresnel lens is fixedly connected to the upper end surface of the middle cover, a wire outlet hole for inserting a power cord is opened on the inner bottom wall of the lower cover, and an auxiliary fixing component for fixing the power cord is provided on the middle cover.

[0006] As a preferred embodiment of the above technical solution, the auxiliary fixing component includes an installation cavity opened on the middle cover, an upper pressure frame is provided on the inner side of the installation cavity, the upper pressure frame is fixedly installed on the middle cover by screws, and a lower pressure frame is fixedly connected to the inner bottom wall of the lower cover. The upper pressure frame and the lower pressure frame are used together to press and fix the power cord.

[0007] As a preferred embodiment of the above technical solution, a plurality of card frames are fixed in an annular array on the upper end surface of the lower cover, and a plurality of card blocks are fixed in an annular array on the outer side wall of the middle cover, and the card blocks are clamped in the card frames.

[0008] As a preferred embodiment of the above technical solution, mounting grooves are provided on the opposite outer walls of the middle cover, and mounting plugs adapted to the mounting grooves are fixedly connected to the opposite inner walls of the upper cover.

[0009] As a preferred embodiment of the above technical solution, a mounting hole is provided on the middle cover, a positioning cylinder is preset on the PCB substrate, and an adjustment knob is provided in the mounting hole and the positioning cylinder.

[0010] As a preferred embodiment of the above technical solution, the Fresnel lens passes through the opening at the center of the upper cover.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] In the present invention, the auxiliary fixing assembly is provided to tightly fix the end of the power cord, preventing the power cord from accidentally detaching from the terminal block due to external pulling force (such as accidental touch by a person, biting by an animal, or strong wind) during use, thereby maintaining a stable connection between the power cord and the terminal block, thereby ensuring the continuous and reliable operation of the sensor. In addition, the internal components can be easily replaced or repaired without complicated disassembly between the upper cover, the middle cover, and the lower cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the overall structure of a pyroelectric infrared sensor;

[0014] Figure 2 This is a schematic diagram of the first explosion structure of a pyroelectric infrared sensor;

[0015] Figure 3 A schematic diagram of a second explosion structure of a pyroelectric infrared sensor;

[0016] Figure 4 Schematic diagram of the connection structure between the lower cover and the PCB substrate;

[0017] Figure 5 This is a schematic diagram of the third explosion structure of a pyroelectric infrared sensor.

[0018] In the figure: 1. Lower cover; 101. Card frame; 11. Middle cover; 111. Card block; 12. Upper cover; 13. Positioning block; 14. PCB substrate; 15. Wiring terminal; 16. Pyroelectric sensor; 17. Relay; 18. Fresnel lens; 19. Wire outlet; 2. Auxiliary fixing assembly; 21. Mounting cavity; 22. Upper pressure frame; 23. Lower pressure frame; 31. Mounting slot; 32. Mounting plug; 41. Mounting hole; 42. Positioning cylinder; 43. Adjustment knob. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0020] Example

[0021] like Figure 1-Figure 5 As shown, the utility model provides a technical solution: a pyroelectric infrared sensor, including a lower cover 1, a middle cover 11 and an upper cover 12, a plurality of positioning blocks 13 are fixedly connected to the inner bottom wall of the lower cover 1, a PCB substrate 14 is provided on the upper end surface of the plurality of positioning blocks 13, a wiring terminal 15, a pyroelectric sensor 16 and a relay 17 are fixedly installed on the upper end surface of the PCB substrate 14, the lower cover 1 and the middle cover 11 are fixed by snapping, the middle cover 11 and the upper cover 12 are detachably fixed, a Fresnel lens 18 is fixedly connected to the upper end surface of the middle cover 11, the Fresnel lens 18 passes through the opening at the center of the upper cover 12, a wire outlet hole 19 for inserting the power cord is provided on the inner bottom wall of the lower cover 1, and an auxiliary fixing component 2 for fixing the power cord is provided on the middle cover 11. During specific use, the upper end surface of the positioning block 13 provides a support platform for the PCB substrate 14, and various electronic components are integrated on the PCB substrate 14, including the wiring terminal 15, the pyroelectric sensor 1 6 and relay 17, connect the sensor to the external circuit or device through the terminal 15. When the sensor detects infrared radiation released by the human body or other heat source (the Fresnel lens 18 can focus and enhance the reception effect of infrared radiation, thereby improving the sensitivity and detection range of the sensor), the pyroelectric sensor 16 converts it into an electrical signal and processes it through the circuit on the PCB substrate 14. The processed signal triggers the action of the relay 17, thereby controlling the on and off of the external circuit. The auxiliary fixing component 2 is provided to tightly fix the power cord to prevent the power cord from accidentally detaching from the terminal 15 due to external pulling force (such as accidental touch by a person, animal bite or strong wind) during use, thereby maintaining a stable connection between the power cord and the terminal 15, thereby ensuring the continuous and reliable operation of the sensor. In addition, the internal components can be easily replaced or repaired without complicated disassembly between the upper cover 12, the middle cover 11 and the lower cover 1.

[0022] As an implementation method in this embodiment, Figure 2 and Figure 3As shown, the auxiliary fixing component 2 includes a mounting cavity 21 opened on the middle cover 11, and an upper pressing frame 22 is provided on the inner side of the mounting cavity 21. The upper pressing frame 22 is fixedly installed on the middle cover 11 by screws, and a lower pressing frame 23 is fixedly connected to the inner bottom wall of the lower cover 1. The upper pressing frame 22 and the lower pressing frame 23 are used together to press and fix the power cord. During specific use, the upper pressing frame 22 is placed above the mounting cavity 21 and fixed to the middle cover 11 with screws. After the middle cover 11 and the lower cover 1 are fixed, the power cord is fixed between the upper pressing frame 22 and the lower pressing frame 23, so that the power cord will not fall off due to external pulling force.

[0023] As an implementation method in this embodiment, Figure 2 As shown, a plurality of card frames 101 are fixed in a circular array on the upper end surface of the lower cover 1, and a plurality of card blocks 111 are fixed in a circular array on the outer side wall of the middle cover 11. The card blocks 111 are clamped in the card frames 101. During use, the card blocks 111 of the middle cover 11 are first aligned with the card frames 101 of the lower cover 1. After alignment, lightly apply pressure to push the middle cover 11 toward the lower cover 1, so that the card blocks 111 gradually deform and enter the card frames 101 (the card blocks 111 can be made of elastic plastic). The elastic structure of the card blocks 111 plays a key role. It can accommodate and clamp the card blocks 111, thereby achieving a firm clamping connection.

[0024] As an implementation method in this embodiment, Figure 5 As shown, mounting grooves 31 are provided on the opposite outer walls of the middle cover 11, and mounting plugs 32 adapted to the mounting grooves 31 are fixedly connected to the opposite inner walls of the upper cover 12. During use, the mounting plugs 32 of the upper cover 12 are first aligned with the mounting grooves 31 on the middle cover 11 and inserted, and then the upper cover 12 is rotated so that the mounting plugs 32 of the upper cover 12 are stuck in the mounting grooves 31, so that the upper cover 12 can be quickly fixed on the middle cover 11.

[0025] As an implementation method in this embodiment, Figure 3 As shown, a mounting hole 41 is provided on the middle cover 11, and a positioning cylinder 42 is pre-set on the PCB substrate 14. An adjustment knob 43 is provided in the mounting hole 41 and the positioning cylinder 42. The middle cover 11 is fixed to the PCB substrate 14 by the provided adjustment knob 43. In this way, when the middle cover 11 is fixed to the lower cover 1, the PCB substrate 14 can also be firmly fixed inside.

[0026] Working principle: First, fix the middle cover 11 on the PCB substrate 14 through the set adjustment knob 43, and then align the card block 111 of the middle cover 11 with the card frame 101 of the lower cover 1. After alignment, gently apply pressure to push the middle cover 11 toward the lower cover 1, so that the card block 111 gradually deforms and enters the card frame 101, thereby achieving a firm snap connection. After the middle cover 11 and the lower cover 1 are fixed, the power cord is fixed between the upper pressure frame 22 and the lower pressure frame 23, so that the power cord will not fall off due to external pulling force. Then align the mounting block 32 of the upper cover 12 with the mounting slot 31 on the middle cover 11 and insert it. Then rotate the upper cover 12 so that the mounting block 32 of the upper cover 12 is stuck in the mounting slot 31. In this way, the upper cover 12 can be quickly fixed on the middle cover 11, thus completing the installation of the sensor.

[0027] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. A pyroelectric infrared sensor, comprising a lower cover (1), a middle cover (11) and an upper cover (12), characterized in that: A plurality of positioning blocks (13) are fixedly connected to the inner bottom wall of the lower cover (1), and a PCB substrate (14) is provided on the upper end surface of the plurality of positioning blocks (13). A wiring terminal (15), a pyroelectric sensor (16) and a relay (17) are fixedly installed on the upper end surface of the PCB substrate (14). The lower cover (1) and the middle cover (11) are fixed by snapping, and the middle cover (11) and the upper cover (12) are detachably fixed. A Fresnel lens (18) is fixedly connected to the upper end surface of the middle cover (11). A wire outlet hole (19) for inserting a power cord is provided on the inner bottom wall of the lower cover (1), and an auxiliary fixing component (2) for fixing the power cord is provided on the middle cover (11).

2. The pyroelectric infrared sensor according to claim 1, characterized in that: The auxiliary fixing assembly (2) includes a mounting cavity (21) opened on the middle cover (11), an upper pressing frame (22) is provided inside the mounting cavity (21), the upper pressing frame (22) is fixedly mounted on the middle cover (11) by screws, and a lower pressing frame (23) is fixedly connected to the inner bottom wall of the lower cover (1), and the upper pressing frame (22) and the lower pressing frame (23) are used in conjunction with each other to press and fix the power cord.

3. The pyroelectric infrared sensor according to claim 1, characterized in that: A plurality of card frames (101) are fixed in an annular array on the upper end surface of the lower cover (1), and a plurality of card blocks (111) are fixed in an annular array on the outer side wall of the middle cover (11), and the card blocks (111) are clamped in the card frames (101).

4. The pyroelectric infrared sensor according to claim 1, characterized in that: Mounting grooves (31) are provided on the opposite outer walls of the middle cover (11), and mounting plugs (32) adapted to the mounting grooves (31) are fixedly connected to the opposite inner walls of the upper cover (12).

5. The pyroelectric infrared sensor according to claim 1, characterized in that: A mounting hole (41) is provided on the middle cover (11), a positioning cylinder (42) is preset on the PCB substrate (14), and an adjusting knob (43) is provided in the mounting hole (41) and the positioning cylinder (42).

6. The pyroelectric infrared sensor according to claim 1, characterized in that: The Fresnel lens (18) passes through the opening at the center of the upper cover (12).

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