An infrared trace gas sensor

Abstract

This utility model relates to the field of gas sensor technology and discloses an infrared micro-gas sensor, comprising: a lower sleeve, the lower sleeve being cylindrical; a filter structure, the filter structure including a first filter part and a second filter part, the first filter part including an upper sleeve disposed at the top of the lower sleeve, a filter plate disposed inside the upper sleeve, two sets of second arc-shaped snap-fit ​​grooves being formed on the outer wall of the filter plate, and two sets of first arc-shaped limiting blocks being fixedly installed on the inner wall of the upper sleeve, the first arc-shaped limiting blocks being snap-fitted into the interior of the second arc-shaped snap-fit ​​grooves; the second filter part including a first arc-shaped snap-fit ​​groove formed at the bottom of the first arc-shaped limiting blocks, achieving the purpose of limiting and fixing the filter plate, improving the fixing effect of the filter plate, improving the protection capability, enabling quick disassembly and installation of the filter plate, improving the cleaning efficiency of the filter plate, improving the durability of the device, and extending the service life of the device.

Description

Technical Field

[0001] This utility model belongs to the field of gas sensor technology, specifically, it relates to an infrared trace gas sensor. Background Technology

[0002] Accurate detection of trace gases is crucial in many fields. Common gas sensors include electrochemical sensors and semiconductor sensors, but these sensors have limitations. Electrochemical sensors typically have a short lifespan and are easily affected by interference from other gases; semiconductor sensors have poor selectivity and stability, resulting in limited detection accuracy. In contrast, infrared gas sensors, based on the principle of gas absorption of specific wavelengths of infrared light, offer advantages such as high selectivity, high sensitivity, and long lifespan.

[0003] Application CN221260800U discloses an infrared gas sensor, including a gas absorption cell, an infrared light source assembly, and an infrared receiving unit. A cavity for containing sample gas is provided through the gas absorption cell. The infrared light source assembly and the infrared receiving unit are located at two openings of the cavity. In this embodiment, the aforementioned infrared gas sensor emits infrared light into the cavity through the infrared light source assembly. The infrared light entering the cavity is reflected along the inner wall of the cavity and the reflective slope, absorbed by the sample gas, and then emitted and received by the infrared receiving unit. The infrared receiving unit amplifies the acquired weak infrared light signal and outputs it as an electrical signal. The infrared light reflection structure can increase the optical path within a limited volume, reduce the sensor's response time, and improve the sensor's sensitivity. Simultaneously, after the temperature sensor acquires the temperature data of the sample gas inside the cavity, it can work with a heating element to dynamically adjust the temperature of the sample gas inside the cavity, ensuring detection accuracy.

[0004] However, the aforementioned patent still has the following problems: During the gas transportation process, there are some impurities such as dust and particles in the gas. The filter plate plays an important role in the infrared gas sensor. It can remove impurities such as dust and particles from the sample gas and prevent these impurities from affecting the propagation and absorption of infrared light. During the filter plate filling process, the filter plate may fall off. If the filter plate falls off, not only will the impurities in the sample gas not be effectively filtered, but it may also enter the gas absorption cell, damaging key components such as the infrared light source component or the infrared receiving unit, affecting the normal operation of the sensor.

[0005] In view of this, this utility model is proposed. Utility Model Content

[0006] To solve the aforementioned technical problem of poor filter plate fixation, the basic concept of the technical solution adopted by this utility model is as follows:

[0007] An infrared trace gas sensor, comprising:

[0008] Lower sleeve, the lower sleeve is cylindrical;

[0009] The filter structure includes a first filter section and a second filter section. The first filter section includes an upper sleeve disposed at the top of the lower sleeve. A filter plate is disposed inside the upper sleeve. Two sets of second arc-shaped locking grooves are formed on the outer wall of the filter plate. Two sets of first arc-shaped limiting blocks are fixedly installed on the inner wall of the upper sleeve. The first arc-shaped limiting blocks are locked inside the second arc-shaped locking grooves. The second filter section includes a first arc-shaped locking groove formed at the bottom of the first arc-shaped limiting blocks. A limiting ring plate is disposed inside the upper sleeve. Two sets of arc-shaped locking blocks are fixedly installed on the top of the limiting ring plate. The arc-shaped locking blocks are locked inside the first arc-shaped locking grooves.

[0010] In a preferred embodiment of the present invention, the top of the lower sleeve is provided with a first limiting groove, the inner wall of the first limiting groove is provided with a first threaded groove, the bottom of the upper sleeve is fixedly installed with a second fixing ring plate, the inner wall of the second fixing ring plate is provided with a second threaded groove, and the second threaded groove is spirally installed on the outer wall of the first threaded groove.

[0011] In a preferred embodiment of this utility model, a first anti-slip strip is fixedly installed on the outer wall of the lower sleeve, and a second anti-slip strip is fixedly installed on the outer wall of the upper sleeve.

[0012] In a preferred embodiment of this utility model, the top of the upper sleeve is provided with an air guide hole, the top of the filter plate is in close contact with the bottom of the air guide hole, and the top of the limiting ring plate is in close contact with the bottom of the filter plate.

[0013] In a preferred embodiment of this utility model, a first sealing cover plate is fixedly installed at the bottom of the lower sleeve. The bottom of the first sealing cover plate has four sets of holes, and pins are fixedly installed in the holes.

[0014] In a preferred embodiment of the present invention, an electronic layer sleeve is fixedly installed on the top of the first sealing cover, an optical layer sleeve is fixedly installed on the top of the electronic layer sleeve, and an infrared lamp module is provided inside the optical layer sleeve.

[0015] In a preferred embodiment of the present invention, a first fixing ring plate is fixedly installed on the top of the optical layer sleeve, and a filter is fixedly installed inside the first fixing ring plate.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. To achieve the purpose of limiting and fixing the filter plate, improve the fixing effect of the filter plate, enhance the protection capability, enable quick disassembly and installation of the filter plate, improve the cleaning efficiency of the filter plate, enhance the durability of the device, and extend the service life of the device.

[0018] 2. To achieve the purpose of combining and connecting the devices, improve the fixing strength between the devices, improve the installation efficiency of the devices, facilitate the rapid combination and installation of the devices, and improve the convenience of using the devices.

[0019] 3. To achieve the purpose of gas detection in the device, improve the device's fixation effect, enhance the stability of the device's detection, and optimize the user experience of the device.

[0020] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0021] In the attached diagram:

[0022] Figure 1 This is a front view of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of this utility model;

[0024] Figure 3 This is a schematic diagram showing the disassembled parts of this utility model;

[0025] Figure 4 This is a schematic diagram showing the disassembled lower sleeve and first sealing cover plate of this utility model;

[0026] Figure 5 This is a schematic diagram of the first arc-shaped limiting block structure of this utility model;

[0027] Figure 6 This is a schematic diagram showing the disassembled filter plate and limiting ring plate of this utility model.

[0028] In the diagram: 10. Lower sleeve; 11. First sealing cover plate; 12. Pin; 13. Electronic layer sleeve; 14. Optical layer sleeve; 15. First fixing ring plate; 16. Filter; 17. First anti-slip strip; 18. First limiting groove; 19. First threaded groove; 20. Upper sleeve; 21. Second anti-slip strip; 22. Air vent; 23. Second fixing ring plate; 24. Second threaded groove; 25. First arc-shaped limiting block; 26. First arc-shaped snap-fit ​​groove; 27. Filter plate; 28. Second arc-shaped snap-fit ​​groove; 29. ​​Limiting ring plate; 30. Arc-shaped snap-fit ​​block. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model.

[0030] Example 1: An infrared trace gas sensor, specifically as follows Figure 1 , Figure 5 and Figure 6 As shown, the system includes a lower sleeve 10, which is cylindrical; a filter structure, which includes a first filter section and a second filter section. The first filter section includes an upper sleeve 20 disposed at the top of the lower sleeve 10. A filter plate 27 is disposed inside the upper sleeve 20. Two sets of second arc-shaped locking grooves 28 are opened on the outer wall of the filter plate 27. Two sets of first arc-shaped limiting blocks 25 are fixedly installed on the inner wall of the upper sleeve 20. The first arc-shaped limiting blocks 25 are locked inside the second arc-shaped locking grooves 28. The second filter section includes a first arc-shaped locking groove 26 opened at the bottom of the first arc-shaped limiting block 25. A limiting ring plate 29 is disposed inside the upper sleeve 20. Two sets of arc-shaped locking blocks 30 are fixedly installed on the top of the limiting ring plate 29. The arc-shaped locking blocks 30 are locked inside the first arc-shaped locking grooves 26. The gas is filtered by the filter structure. The filter plate 27 is placed inside the upper sleeve 20. The second arc-shaped snap-fit ​​groove 28 is snapped onto the outer wall of the first arc-shaped limiting block 25, limiting the filter plate 27 between the two sets of first arc-shaped limiting blocks 25. The limiting ring plate 29 is pushed, and the arc-shaped snap-fit ​​block 30 is snapped onto the inside of the first arc-shaped snap-fit ​​groove 26, limiting the filter plate 27 inside the upper sleeve 20.

[0031] Based on the above, the structure of the upper sleeve 20, the first arc-shaped limiting block 25, the first arc-shaped snap-fit ​​groove 26, the filter plate 27, the second arc-shaped snap-fit ​​groove 28, the limiting ring plate 29, and the arc-shaped snap-fit ​​block 30 achieves the purpose of limiting and fixing the filter plate, improving the fixing effect of the filter plate, improving the protection capability, enabling quick disassembly and installation of the filter plate, improving the cleaning efficiency of the filter plate, improving the durability of the device, and extending the service life of the device.

[0032] Example 2: Based on Example 1, specifically as follows... Figure 1 , Figure 3 and Figure 4 As shown, the lower sleeve 10 has a first limiting groove 18 at its top, and a first threaded groove 19 on its inner wall. The upper sleeve 20 has a second fixing ring plate 23 fixedly installed at its bottom, and a second threaded groove 24 on its inner wall. The second threaded groove 24 is spirally installed onto the outer wall of the first threaded groove 19. Rotating the upper sleeve 20 spirally installs the second threaded groove 24 onto the outer wall of the first threaded groove 19, and installs the second fixing ring plate 23 inside the first limiting groove 18, thus sealing and fixing the lower sleeve 10 and the upper sleeve 20.

[0033] Specifically, such as Figure 1 , Figure 4 and Figure 5As shown, a first anti-slip strip 17 is fixedly installed on the outer wall of the lower sleeve 10, and a second anti-slip strip 21 is fixedly installed on the outer wall of the upper sleeve 20. This increases the friction between the hand and the lower sleeve 10 and the upper sleeve 20.

[0034] Specifically, such as Figure 2 , Figure 3 , Figure 5 and Figure 6 As shown, the top of the upper sleeve 20 has a vent hole 22, the top of the filter plate 27 is in close contact with the bottom of the vent hole 22, and the top of the limiting ring plate 29 is in close contact with the bottom of the filter plate 27. The gas is guided and transported through the second fixing ring plate 232.

[0035] Based on the above, the structure of the lower sleeve 10, the first limiting groove 18, the first threaded groove 19, the upper sleeve 20, the second anti-slip strip 21, the air guide hole 22, the second fixing ring plate 23, the second threaded groove 24, the filter plate 27 and the limiting ring plate 29 achieves the purpose of combining and connecting the devices, improving the fixing strength between the devices, improving the installation efficiency of the devices, facilitating the rapid combination and installation of the devices, and improving the convenience of using the devices.

[0036] Example 3: Based on Examples 1 and 2, specifically as follows... Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a first sealing cover plate 11 is fixedly installed at the bottom of the lower sleeve 10. The bottom of the first sealing cover plate 11 has four sets of holes, and pins 12 are fixedly installed in the holes. The pins 12 are fixed by the first sealing cover plate 11.

[0037] Specifically, such as Figure 4 As shown, an electronic layer sleeve 13 is fixedly installed on the top of the first sealing cover plate 11, and an optical layer sleeve 14 is fixedly installed on the top of the electronic layer sleeve 13. An infrared lamp module is installed inside the optical layer sleeve 14. The optical layer sleeve 14 is fixed by the electronic layer sleeve 13, and infrared ray refraction gas detection is performed through the optical layer sleeve 14.

[0038] Specifically, such as Figure 3 and Figure 4 As shown, a first fixing ring plate 15 is fixedly installed on the top of the optical layer sleeve 14, and a filter 16 is fixedly installed inside the first fixing ring plate 15. The filter 16 is fixed by the first fixing ring plate 15.

[0039] The electronic layer sleeve 13 is equipped with an electronic module, and the components of the electronic module work together: In the signal processing module, the microcontroller acts as the "brain" to receive the electrical signals from the optical layer, calculate the gas concentration, and control the infrared lamps; the signal amplifier amplifies the weak signals to ensure accuracy. In the power management module, the power conversion chip converts the external power supply into the stable voltage required internally, and the power filter capacitor reduces noise interference and stabilizes the voltage. The communication module uses a wireless communication chip (such as Wi-Fi or Bluetooth) and an antenna to realize data interaction and remote control between the sensor and external devices. The temperature compensation module monitors the temperature in real time through a temperature sensor and transmits the data to the microcontroller. The temperature compensation circuit processes the converted signals, corrects the data, eliminates the influence of temperature on the detection results, and ensures stable and accurate operation of the sensor.

[0040] This infrared spotlight module typically consists of an infrared light source and an optical collimating element. The infrared light source uses a specific wavelength light-emitting element to emit infrared light that matches the absorption peak of the gas to be detected. The optical collimating element is responsible for collimating the light emitted by the infrared light source, ensuring it propagates as a parallel beam within the optical layer sleeve 14, thus improving the efficiency of light-gas interaction. When the gas to be detected enters the optical layer cavity, the specific wavelength infrared light emitted by the infrared spotlight module passes through the gas. Gas molecules absorb the infrared light energy corresponding to their absorption peak, causing an attenuation of the infrared light intensity transmitted through the gas. By measuring the attenuated infrared light intensity using an infrared detector located in the optical layer sleeve 14, the gas concentration can be calculated according to Lambert-Beer's law. Both the electronic module and the infrared spotlight module are existing technologies and will not be described in detail further.

[0041] In summary, the structure of the lower sleeve 10, the first sealing cover plate 11, the pin 12, the electronic layer sleeve 13, the optical layer sleeve 14, the first fixing ring plate 15, and the filter 16 achieves the purpose of gas detection, improves the device's fixation effect, enhances the device's detection stability, and optimizes the user experience.

[0042] Working principle: The filter structure consists of a first filter section and a second filter section. In the first filter section, the first arc-shaped limiting block 25 on the inner wall of the upper sleeve 20 engages with the second arc-shaped snap-fit ​​groove 28 on the outer wall of the filter plate 27, initially limiting the filter plate 27 between the two sets of first arc-shaped limiting blocks 25. In the second filter section, the arc-shaped snap-fit ​​block 30 at the top of the limiting ring plate 29 engages with the first arc-shaped snap-fit ​​groove 26 at the bottom of the first arc-shaped limiting block 25, further securing the filter plate 27 inside the upper sleeve 20. When gas enters the sensor, it first passes through the filter plate 27, which can intercept dust, particles, and other impurities in the gas. The gas acts as a purifier, preventing impurities from affecting subsequent gas detection processes and ensuring detection accuracy. The first threaded groove 19 on the inner wall of the first limiting groove 18 at the top of the lower sleeve 10 is screwed onto the second threaded groove 24 on the inner wall of the second fixing ring plate 23 at the bottom of the upper sleeve 20, so that the second fixing ring plate 23 is installed in the first limiting groove 18, achieving a sealed fixation between the lower sleeve 10 and the upper sleeve 20. The air guide hole 22 at the top of the upper sleeve 20 serves as a gas guide, allowing the filtered gas to enter the sensor for subsequent detection through the air guide hole 22. At the same time, the top of the filter plate 27 is in close contact with the bottom of the air guide hole 22, and the top of the limiting ring plate 29 is in close contact with the bottom of the filter plate 27, ensuring that the gas can only enter after being filtered by the filter plate 27, preventing gas leakage or bypassing the filter plate 27. The first anti-slip strip 17 on the outer wall of the lower sleeve 10 and the second anti-slip strip 21 on the outer wall of the upper sleeve 20 increase the friction between the hand and the lower sleeve 10 and the upper sleeve 20. When installing, disassembling, or operating the sensor, it can be held more securely to prevent slippage and facilitate operation. The first sealing cover plate 11 fixed to the bottom of the lower sleeve 10 has four sets of holes at its bottom for fixing pins 12. Pins 12 serve to connect the sensor to external circuitry. Fixing pins 12 with the first sealing cover plate 11 ensures their stability and reliability, guaranteeing that the sensor can transmit signals and supply power normally to external devices. The electronic layer sleeve 13 fixed to the top of the first sealing cover plate 11 provides installation space and protection for electronic components. The optical layer sleeve 14 fixed to the top of the electronic layer sleeve 13 provides an installation position for optical detection components. Fixing the optical layer sleeve 14 with the electronic layer sleeve 13 makes the entire sensor structure more stable and the relative positions between components accurate, which is beneficial to the normal operation of the sensor. The infrared lamp module set inside the optical layer sleeve 14 can emit infrared light of a specific wavelength. Different gas molecules have specific absorption characteristics for infrared light of different wavelengths. By selecting an infrared lamp of a suitable wavelength, specific trace gases can be detected. The filter 16 fixed inside the first fixing ring plate 15 at the top of the optical layer sleeve 14 can further filter the light.It can filter out infrared light that is not related to the absorption wavelength of the target gas, allowing only infrared light of specific wavelengths to pass through, thereby improving the selectivity and accuracy of detection and reducing interference from other wavelengths of light. The infrared light filtered by the filter 16 enters the gas detection area inside the sensor and interacts with the filtered sample gas. The target gas molecules absorb the infrared light energy corresponding to their absorption peak, causing the intensity of the infrared light transmitted through the gas to decrease.

[0043] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. An infrared trace gas sensor, characterized in that, include: The lower sleeve (10) is cylindrical; The filter structure includes a first filter section and a second filter section. The first filter section includes an upper sleeve (20) disposed at the top of the lower sleeve (10). A filter plate (27) is disposed inside the upper sleeve (20). Two sets of second arc-shaped snap-fit ​​grooves (28) are opened on the outer wall of the filter plate (27). Two sets of first arc-shaped limiting blocks (25) are fixedly installed on the inner wall of the upper sleeve (20). The first arc-shaped limiting blocks (25) are snap-fitted into the interior of the second arc-shaped snap-fit ​​grooves (28). The second filter section includes a first arc-shaped snap-fit ​​groove (26) opened at the bottom of the first arc-shaped limiting block (25). A limiting ring plate (29) is disposed inside the upper sleeve (20). Two sets of arc-shaped snap-fit ​​blocks (30) are fixedly installed on the top of the limiting ring plate (29). The arc-shaped snap-fit ​​blocks (30) are snap-fitted into the interior of the first arc-shaped snap-fit ​​groove (26).

2. The infrared trace gas sensor according to claim 1, characterized in that, The lower sleeve (10) has a first limiting groove (18) at the top and a first threaded groove (19) on the inner wall of the first limiting groove (18). The upper sleeve (20) has a second fixing ring plate (23) fixedly installed at the bottom and a second threaded groove (24) on the inner wall of the second fixing ring plate (23). The second threaded groove (24) is spirally installed on the outer wall of the first threaded groove (19).

3. The infrared trace gas sensor according to claim 1, characterized in that, A first anti-slip strip (17) is fixedly installed on the outer wall of the lower sleeve (10), and a second anti-slip strip (21) is fixedly installed on the outer wall of the upper sleeve (20).

4. The infrared trace gas sensor according to claim 1, characterized in that, The top of the upper sleeve (20) is provided with an air guide hole (22), the top of the filter plate (27) is in close contact with the bottom of the air guide hole (22), and the top of the limiting ring plate (29) is in close contact with the bottom of the filter plate (27).

5. The infrared trace gas sensor according to claim 1, characterized in that, The bottom of the lower sleeve (10) is fixedly installed with a first sealing cover plate (11), and the bottom of the first sealing cover plate (11) has four sets of holes, and pins (12) are fixedly installed in the holes.

6. The infrared trace gas sensor according to claim 5, characterized in that, An electronic layer sleeve (13) is fixedly installed on the top of the first sealing cover plate (11), and an optical layer sleeve (14) is fixedly installed on the top of the electronic layer sleeve (13). An infrared lamp module is provided inside the optical layer sleeve (14).

7. The infrared trace gas sensor according to claim 6, characterized in that, The top of the optical layer sleeve (14) is fixedly installed with a first fixing ring plate (15), and a filter (16) is fixedly installed inside the first fixing ring plate (15).

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