A high-precision temperature measuring sensor

Abstract

The utility model relates to a kind of high-precision temperature measurement sensors, including protective cover upper cover, lens, protective cover bottom shell and sensor, the sensor is embedded fixed in protective cover bottom shell, its core lies in: through the innovative focal length structure, multilayer heat insulation and heat dissipation structure and the optical design of effectively inhibiting stray light, the key problem of industrial grade infrared temperature measurement sensor in field of view angle flexibility, environmental temperature adaptability and measurement precision stability is solved, the performance and reliability of product under complex application scene are significantly improved.

Description

Technical Field

[0001] This utility model relates to a high-precision temperature sensor. Background Technology

[0002] Currently, infrared single-point temperature measurement technology has a wide range of applications. In the medical field, the main product is the temperature gun. Because temperature guns operate in relatively favorable environments with short testing distances, their probes typically use bare probes. However, in temperature measurement applications in home appliances and industrial sectors, the environments are complex and diverse, the testing distances are longer, and the requirements for the field of view vary. This leads to several drawbacks: the diverse requirements for field of view necessitate the customization of sensors with different focal lengths, increasing workload and cost. Furthermore, existing sensors perform poorly in terms of thermal shock resistance, heat dissipation, and insulation. Under harsh environments such as sudden temperature changes, the temperature measurement accuracy drops significantly, leading to unstable accuracy and drift errors. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of the aforementioned technologies by providing a high-precision temperature sensor that meets the diverse requirements for field of view size and offers excellent resistance to thermal shock, heat dissipation, and thermal insulation.

[0004] To achieve the above objectives, this utility model designs a high-precision temperature sensor, including a protective cover top cover, a lens, a protective cover bottom shell, and a sensor. The sensor is embedded and fixed inside the protective cover bottom shell. It also includes a spring and a PCB sealing plate. The inner wall of the protective cover top cover has a lower thread and an upper thread for absorbing ineffective infrared energy. The outer wall of the protective cover bottom shell has a thread that mates with the lower thread. The protective cover top cover is connected to the protective cover bottom shell via the lower thread engagement. Between the upper and lower threads, a lens fixing groove is provided for mounting the lens. The outer diameter of the lens fixing groove matches the outer diameter of the lens. The spring is telescopically positioned between the lens and the protective cover bottom shell. The lens is pressed and fixed in the lens fixing groove by the spring's elastic force. The spring is located between the lens and the protective cover bottom shell. The PCB sealing plate is embedded in the bottom of the protective cover bottom shell. The design of the lower thread engaging with the protective cover bottom shell allows the protective cover top cover to rotate on the protective cover bottom shell. While the spring secures the lens, its own elasticity also enhances the friction between the lower thread of the protective cover's upper shell and the thread of the protective cover's bottom shell. The upper thread and part of the lower thread exposed between the springs absorb external ineffective infrared energy, preventing reflection of ineffective infrared light entering the threaded structure. The lens fixing groove limits the lens's position. The PCB sealing plate is used to seal the temperature measuring device, providing sealing and heat insulation.

[0005] A further solution is a high-precision temperature sensor designed in this invention. The sensor includes a cap, a thermopile, a ceramic plate, and a metal base. The cap and metal base are combined, and the thermopile and ceramic plate are encapsulated using a vacuum process. The ceramic plate is mounted on the metal base, and the thermopile is mounted on the ceramic plate. The ceramic plate is printed with carbon black ink. This design, where the cap and base are combined and encapsulated internally using a vacuum process, provides physical protection to the interior, preventing the intrusion of external dust, moisture, or corrosive substances. The ceramic plate has extremely low thermal conductivity, preventing heat transfer to the cold end of the thermopile through the bottom metal base. The carbon black ink printed on the surface of the ceramic plate absorbs any ineffective energy entering the sensor.

[0006] A further improvement is that the high-precision temperature sensor designed in this invention also includes a potting space. This potting space is located below the sensor and is formed by a PCB sealing plate and a protective cover. The PCB sealing plate has potting holes for potting the adhesive. The potting space is filled with an adhesive with ultra-low thermal conductivity and high-temperature resistance. The adhesive filling in the potting space effectively isolates the sensor from sudden changes in external temperature and also better secures the sensor.

[0007] A further improvement is that the high-precision temperature sensor designed in this invention also includes a PCB circuit board. The PCB circuit board is fixedly connected to the bottom shell of the protective cover, with a window made at the connection point and coated with thermally conductive silicone grease. As an integral part of the temperature sensor, the PCB circuit board supports all the aforementioned components and, together with the thermally conductive silicone grease, dissipates heat from the sensor protective cover, while also connecting to external circuitry.

[0008] A further improvement is that this invention designs a high-precision temperature sensor, in which the protective cover's top and bottom shells are made of a metal with good thermal conductivity. The purpose of this design is to cope with sudden changes in external temperature by utilizing its excellent thermal conductivity to dissipate heat through the PCB circuit board, ensuring that the internal sensor is unaffected by external temperature changes and thus preventing measurement deviations.

[0009] The high-precision temperature sensor designed in this invention solves the key problems of field-of-view flexibility, environmental temperature adaptability, and measurement accuracy stability of industrial-grade infrared temperature sensors through an innovative adjustable focal length structure, multi-layer heat insulation and heat dissipation system, and optical design that effectively suppresses stray light. This significantly improves the performance and reliability of the product in complex application scenarios. Attached Figure Description

[0010] Figure 1 This is an exploded schematic diagram of this utility model.

[0011] Figure 2 This is a cross-sectional schematic diagram of the present invention.

[0012] Figure 3 This is an exploded view of the sensor described in this utility model.

[0013] Explanation of reference numerals in the attached drawings: 1. Protective cover top cover; 2. Lens; 3. Spring; 4. Protective cover bottom shell; 5. Sensor; 6. PCB sealing plate; 7. Upper thread; 8. Lower thread; 9. Lens fixing groove; 10. Potting space; 11. PCB circuit board; 12. Tube cap; 13. Thermopile; 14. Ceramic sheet; 15. Metal tube seat. Detailed Implementation

[0014] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0015] Example 1.

[0016] like Figure 1 and Figure 2As shown in this embodiment, a high-precision temperature sensor includes a protective cover 1, a lens 2, a spring 3, a protective cover bottom shell 4, a sensor 5, a PCB sealing plate 6, a potting space 10, and a PCB circuit board 11. The inner wall of the protective cover 1 has a lower thread 8 and an upper thread 7 for absorbing external invalid infrared energy. The lower thread 8 prevents invalid infrared light from being reflected after entering the threaded structure, resulting in more accurate measurement results. The outer wall of the protective cover bottom shell 4 has threads that mate with the lower thread 8. The protective cover 1 is connected to the protective cover bottom shell 4 via the lower thread 8. Between the upper thread 7 and the lower thread 8, a lens fixing groove 9 is provided for mounting the lens 2. The lens 2 is placed within this groove, and the outer diameter of the lens fixing groove 9 matches the outer diameter of the lens 2, limiting the movement of the lens 2. The spring 3 is retractably positioned between the lens 2 and the protective cover bottom shell 4. The lens 2 is pressed and fixed in the lens fixing groove 9 by the elastic force of the spring 3. While fixing the lens 2, the spring 3's own elastic force strengthens the connection between the lower thread of the protective cover and the threads of the protective cover bottom shell. The friction between the lenses ensures that the adjusted focal length remains fixed and does not shift. By rotating the protective cover 1, the distance between the lens and the sensor can be changed, thereby adjusting the sensor's temperature measurement focal length. This solves the problem of varying distances and field of view between the temperature measuring device and the measured point under different environments. After adjusting the focal length, the thread structure of the lower thread 8, from the bottom shell 4 of the protective cover to the top of the lower thread 8, also absorbs ineffective infrared energy. The lens 2 is placed in the lens fixing groove 9 to prevent direct impact from external temperature changes, which could then be transmitted to the internal sensor 5, causing temperature changes at the cold end of the sensor 5 and affecting measurement accuracy. The PCB sealing plate 6 is embedded in the bottom of the protective cover 4 to seal the temperature measuring device, providing a sealing and heat insulation function. It has a potting hole for potting adhesive. The potting space 10 is located below the sensor 5 and is formed by the PCB sealing plate 6 and the bottom shell 4 of the protective cover. The potting space 10 is filled with adhesive with ultra-low thermal conductivity and high temperature resistance. The adhesive filling the potting space 10 effectively isolates sudden changes in external temperature and also better fixes the sensor 5. The protective cover 1 and the protective cover bottom shell 4 are made of metal with good thermal conductivity. The protective cover bottom shell 4 is fixedly connected to the PCB board 11. The connection is made with a window and coated with thermal grease. The PCB board 11 is part of the temperature sensor as a whole, carrying all the above components and using thermal grease to dissipate heat from the sensor protective cover, while also connecting to external circuits.

[0017] like Figure 3As shown, the sensor 5 includes a cap 12, a thermopile 13, a ceramic plate 14, and a metal base 15. The cap 12 and the metal base 15 are combined, and the thermopile 13 and ceramic plate 14 are vacuum-encapsulated to provide physical protection for the internal components, preventing the intrusion of external dust, moisture, or corrosive substances, ensuring the stability and reliability of the internal components, and avoiding signal attenuation or distortion, resulting in good shielding. The ceramic plate 14 is mounted on the metal base 15, and the thermopile 13 is mounted on the ceramic plate 14. The ceramic plate 14 is printed with carbon black ink. The ceramic plate 14 has extremely low thermal conductivity, preventing heat from being transferred to the cold end of the thermopile 13 through the bottom metal base 15. Even if there are drastic temperature fluctuations, the ceramic plate 14 can absorb or release some heat, slowing down the rate at which temperature changes are transferred to the thermopile 13. The carbon black ink printed on the surface of the ceramic plate 14 can absorb ineffective energy entering the sensor 5.

[0018] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A high-precision temperature sensor, comprising a protective cover top cover (1), a lens (2), a protective cover bottom shell (4), and a sensor (5), wherein the sensor (5) is embedded and fixed inside the protective cover bottom shell (4), characterized in that, It also includes a spring (3) and a PCB sealing plate (6). The inner wall of the protective cover (1) is provided with a lower thread (8) and an upper thread (7) for absorbing external invalid infrared energy. The outer wall of the protective cover bottom shell (4) has a thread that can cooperate with the lower thread (8). The protective cover (1) is connected to the protective cover bottom shell (4) through the lower thread (8). Between the upper thread (7) and the lower thread (8), there is also a lens fixing groove (9) for setting the lens (2). The outer diameter of the lens fixing groove (9) is matched with the outer diameter of the lens (2). The spring (3) is telescopically set between the lens (2) and the protective cover bottom shell (4). The lens (2) is pressed and fixed in the lens fixing groove (9) by the elastic force of the spring (3). At the same time, the spring (3) is located between the lens (2) and the protective cover bottom shell (4). The PCB sealing plate (6) is embedded in the bottom of the protective cover bottom shell (4).

2. The high-precision temperature sensor according to claim 1, characterized in that, The sensor (5) includes a cap (12), a thermopile (13), a ceramic plate (14), and a metal tube seat (15). The cap (12) is combined with the metal tube seat (15), and the thermopile (13) and the ceramic plate (14) are encapsulated using a vacuum process. The ceramic plate (14) is mounted on the metal tube seat (15), and the thermopile (13) is mounted on the ceramic plate (14). Carbon black ink is printed on the ceramic plate (14).

3. The high-precision temperature sensor according to claim 1, characterized in that, It also includes a potting space (10), which is located below the sensor (5) and is surrounded by a PCB sealing plate (6) and a protective cover bottom shell (4). The PCB sealing plate (6) has a potting hole for potting. The potting space (10) is filled with glue with ultra-low thermal conductivity and high temperature resistance.

4. A high-precision temperature sensor according to claim 1, characterized in that, It also includes a PCB circuit board (11), which is fixedly connected to the bottom shell of the protective cover (4), with a window made at the connection point and thermally conductive silicone grease applied.

5. A high-precision temperature sensor according to claim 1, characterized in that, The protective cover (1) and the protective cover bottom shell (4) are made of a metal with good thermal conductivity.

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