Digital VOC gas sensor

Abstract

The utility model provides a digital VOC (Volatile Organic Compound) gas sensor which comprises a bottom shell, a PID (Proportion Integration Differentiation) photoion sensor and a control circuit board, the upper end of the bottom shell is of an open structure, and the lower end of the bottom shell is provided with a flat cable port communicated with the interior. The control circuit board is fixed in the bottom shell and is electrically connected with an external flat cable through the flat cable port; a pin of the PID photoion sensor is inserted into the bottom shell through the upper end of the bottom shell and is detachably and electrically connected with the control circuit board, and a detection end of the PID photoion sensor is exposed out of the upper end of the bottom shell; according to the VOC gas sensor, the use of the VOC gas sensor is not affected, meanwhile, a worker can conveniently disassemble and assemble the PID photoion sensor in a plugging and unplugging mode, whether an external flat cable goes wrong or not can be checked through the flat cable port, the structure is simple, and the worker can conveniently maintain and calibrate the VOC gas sensor.

Description

Technical Field

[0001] This utility model relates to the field of gas sensor technology, and more specifically, to a digital VOC gas sensor. Background Technology

[0002] VOC (Volatile Organic Compounds) gas sensors are used to detect the concentration of volatile organic compounds. They can monitor the concentration of VOC gases in the air in real time, providing data support for environmental protection, industrial process control, and indoor air quality monitoring. Among VOC gas sensors, the PID photoionization sensor features a wide detection range and high detection accuracy. It uses an ultraviolet light source to ionize organic molecules into positive and negative ions that can be detected by the detector. These ionized particles form a weak current under the influence of an electric field. By detecting the current intensity, amplifying the current, and then converting it through a corresponding algorithm, the gas concentration value can be obtained.

[0003] After assembly, VOC gas sensors require regular maintenance and calibration. This is because during use, due to environmental factors, sensor aging, and other reasons, the measurement data may deviate. Regular maintenance and calibration can ensure that the sensor's measurement data remains accurate, thereby providing users with reliable environmental monitoring information. However, existing VOC gas sensors are often packaged in a single package, which is not conducive to maintenance and calibration. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a digital VOC gas sensor with a simple structure that is easy for staff to maintain and calibrate.

[0005] This utility model provides a digital VOC gas sensor, including a base shell, a PID photoionization sensor, and a control circuit board; the upper end of the base shell has an open structure, and the lower end of the base shell has a ribbon cable port that connects to the interior; the control circuit board is fixed inside the base shell and is electrically connected to an external ribbon cable through the ribbon cable port; the pins of the PID photoionization sensor are inserted into the base shell through the upper end of the base shell and are detachably electrically connected to the control circuit board, and the detection end of the PID photoionization sensor is exposed at the upper end of the base shell.

[0006] Compared with existing technologies, the above technical solution allows for easy installation and removal of the PID photoionization sensor by plugging and unplugging without affecting the use of the VOC gas sensor. It also allows for checking the external wiring for problems through the wiring port. The structure is simple and easy for staff to maintain and calibrate.

[0007] In one possible implementation, both the bottom shell and the PID photoionization sensor are cylindrical, allowing the PID photoionization sensor to be inserted into the bottom shell through the upper end of the bottom shell.

[0008] Compared with existing technologies, the above technical solution can reduce alignment time during insertion and make it easier for staff to install and remove the PID photoionization sensor by plugging and unplugging.

[0009] In one possible implementation, the bottom end of the shell is provided with support ears on both sides in the left and right directions for placing on an external support platform. Both support ears extend in the left and right directions and are provided with a through-hole on both support ears.

[0010] Compared with existing technologies, the above technical solution allows the bottom shell to be effectively fixed to the external support platform by two support ears, which can be fixed by screws, making it easy to install and disassemble.

[0011] In one possible implementation, the lower ends of both support ears protrude from the lower end face of the bottom shell, so that when the bottom shell is placed on the external support platform, a gap is formed between the lower end of the bottom shell and the external support platform.

[0012] Compared with existing technologies, the above technical solution can effectively allow external cabling to run in the gaps.

[0013] In one possible implementation, a sealing ring is fitted on the outer peripheral wall of the PID photoionization sensor, and the sealing ring is sealed to the upper port of the bottom shell.

[0014] Compared with existing technologies, the above technical solution makes it difficult for gas to enter the bottom shell and affect the service life of the control circuit board, thus isolating the inside of the bottom shell from the outside.

[0015] In one possible implementation, the sealing ring is made of silicone.

[0016] Compared with existing technologies, the above-mentioned technical solution can balance elasticity and corrosion resistance.

[0017] In one possible implementation, the control circuit board is bonded to the inner wall of the bottom shell using epoxy structural adhesive.

[0018] Compared with existing technologies, the above technical solution can effectively fix the control circuit board. Attached Figure Description

[0019] Figure 1 This is an exploded view of the present invention;

[0020] Figure 2 This is a schematic diagram of the bottom shell of this utility model;

[0021] Explanation of reference numerals in the attached figures:

[0022] 1-Bottom shell, 2-PID photoionization sensor, 3-Control circuit board, 4-External cable, 11-Cable port, 12-Support ear, 13-Sealing ring, 121-Fixing hole, 122-Gap. Detailed Implementation

[0023] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0024] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0025] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0026] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. (See attached drawings) Figure 1 A coordinate system is set up, with the x-axis square representing the right and the opposite direction representing the left; the y-axis positive direction represents the up and the opposite direction represents the down.

[0027] See Figure 1 This application discloses a digital VOC gas sensor, including a base shell 1, a PID photoionization sensor 2, and a control circuit board 3. The upper end of the base shell 1 has an open structure, and the lower end of the base shell 1 has a cable port 11 that connects to the interior. The control circuit board 3 is fixed inside the base shell 1 and is electrically connected to an external cable 4 through the cable port 11. The pins of the PID photoionization sensor 2 are inserted into the base shell 1 through the upper end of the base shell 1 and are detachably electrically connected to the control circuit board 3, and the detection end of the PID photoionization sensor 2 is exposed at the upper end of the base shell 1.

[0028] Specifically, since the external ribbon cable 4 has rectangular structures at both ends, the ribbon cable port 11 also has a rectangular structure. The control circuit board 3 can be fixed inside the bottom shell 1 with screws. The ribbon cable interface of the control circuit board 3 is located at the ribbon cable port 11. In use, the PID photoionization sensor 2 is inserted from the top of the bottom shell 1, so that the pins at the bottom of the PID photoionization sensor 2 can be connected to the interface of the control circuit board 3 to form a fixed connection. When it needs to be removed, it can be pulled out by force. The external ribbon cable 4 can be checked for problems through the ribbon cable port 11. It should be noted that the interface size at the top of the external ribbon cable 4 needs to match the ribbon cable port 11 so that when the top of the ribbon cable port 11 is electrically connected to the control circuit board 3, it will naturally form a seal on the ribbon cable port 11. That is, when the top of the external ribbon cable 4 is electrically connected to the control circuit board 3, it will block the ribbon cable port 11, preventing external gas from entering. This embodiment has a simple structure, which is convenient for staff to maintain and calibrate.

[0029] In some preferred embodiments, both the base shell 1 and the PID photoionization sensor 2 are cylindrical, allowing the PID photoionization sensor 2 to be inserted into the base shell 1 through its upper end. The diameter of the base shell 1 is slightly larger than the diameter of the PID photoionization sensor 2, enabling the PID photoionization sensor 2 to be inserted from the upper end of the base shell 1, reducing alignment time during insertion, and facilitating the installation and removal of the PID photoionization sensor 2 by operators through insertion and removal.

[0030] In some preferred embodiments, the bottom shell 1 has support ears 12 on both sides of its lower end in the left and right directions for placement on an external support platform. Both support ears 12 extend in the left and right directions, and each support ear 12 has a through-hole 121. The fixing hole 121 is a screw hole structure, and the lower end face of the support ear 12 is a flat structure. This allows the bottom shell 1 to be placed on the external support platform while also being fixed to the external support platform with screws, facilitating assembly and disassembly.

[0031] In some preferred embodiments, the lower ends of both support ears 12 protrude from the lower end face of the bottom shell 1, so that when the bottom shell 1 is placed on the external support platform, a gap 122 is formed between the lower end of the bottom shell 1 and the external support platform. The gap 122 facilitates the routing of external cables 4 and makes maintenance easier.

[0032] In some preferred embodiments, a sealing ring 13 is fitted onto the outer peripheral wall of the PID photoionization sensor 2, and the sealing ring 13 is sealed to the upper port of the bottom shell 1. The sealing ring 13 makes it difficult for gas to enter the interior of the bottom shell 1 and affect the service life of the control circuit board 3, thus isolating the interior of the bottom shell 1 from the outside.

[0033] In some preferred embodiments, the sealing ring 13 is made of silicone. The silicone material provides both elasticity and corrosion resistance for the sealing ring 13.

[0034] In some preferred embodiments, the control circuit board 3 is bonded to the inner wall of the base shell 1 using epoxy structural adhesive. This facilitates production and assembly, requiring only a 30-minute settling time for the epoxy structural adhesive to cure.

[0035] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0036] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0037] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A digital VOC gas sensor, characterized in that, The device includes a base shell (1), a PID photoionization sensor (2), and a control circuit board (3). The upper end of the base shell (1) has an open structure, and the lower end of the base shell (1) has a cable port (11) that connects to the interior. The control circuit board (3) is fixed inside the base shell (1) and electrically connected to an external cable (4) through the cable port (11). The pins of the PID photoionization sensor (2) are inserted into the base shell (1) through the upper end of the base shell (1) and are detachably electrically connected to the control circuit board (3). The detection end of the PID photoionization sensor (2) is exposed at the upper end of the base shell (1).

2. The digital VOC gas sensor according to claim 1, characterized in that, Both the bottom shell (1) and the PID photoionization sensor (2) are cylindrical, allowing the PID photoionization sensor (2) to be inserted into the bottom shell (1) through the upper end of the bottom shell (1).

3. The digital VOC gas sensor according to claim 2, characterized in that, The bottom shell (1) is provided with support ears (12) on both sides of the lower end in the left and right directions for placing on the external support platform. Both support ears (12) extend in the left and right directions, and both support ears (12) are provided with fixing holes (121) that pass through from top to bottom.

4. The digital VOC gas sensor according to claim 3, characterized in that, The lower ends of the two support ears (12) protrude from the lower end face of the bottom shell (1), so that when the bottom shell (1) is placed on the external support platform, a gap (122) is formed between the lower end of the bottom shell (1) and the external support platform.

5. The digital VOC gas sensor according to claim 2, 3 or 4, characterized in that, A sealing ring (13) is fitted on the outer peripheral wall of the PID photoionization sensor (2), and the sealing ring (13) is sealed to the upper port of the bottom shell (1).

6. The digital VOC gas sensor according to claim 5, characterized in that, The sealing ring (13) is made of silicone.

7. The digital VOC gas sensor according to claim 1, 2, 3, 4 or 6, characterized in that, The control circuit board (3) is bonded and fixed to the inner wall of the bottom shell (1) by epoxy structural adhesive.

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