Automatic calibration device for carbon dioxide concentration detector

Abstract

The utility model discloses an automatic calibration device for a carbon dioxide concentration detector, which relates to the technical field of gas detection and comprises a box body, a guide plate and a partition plate are sequentially and fixedly connected in the box body from top to bottom, and two first gas circulation grooves which are symmetrically distributed are formed in the upper end of the guide plate in a penetrating manner. A screen plate is fixedly connected to the interior of the first gas circulation groove, four evenly-distributed first flow guide blocks are fixedly connected to the upper end of the flow guide plate, a second gas circulation groove is formed in the upper end of the partition plate in a penetrating mode, and two symmetrically-distributed second flow guide blocks are fixedly connected to the upper end of the partition plate; according to the utility model, the guide plate, the partition plate, the first guide block, the second guide block, the screen plate and the plurality of stirring plates are arranged to form an efficient multi-layer gas mixing system, and after entering the box body, gas is sequentially subjected to premixing, secondary mixing and tertiary mixing through the components, so that the gas mixing uniformity is effectively improved.

Description

Technical Field

[0001] This utility model relates to the field of gas detection technology, specifically to an automatic calibration device for a carbon dioxide concentration detector. Background Technology

[0002] Carbon dioxide concentration detectors are key devices for detecting carbon dioxide levels in the environment and are widely used in various fields such as industrial production, indoor environmental monitoring, and agricultural planting. In practical applications, to ensure the accuracy and reliability of the detection data, carbon dioxide concentration detectors need to be calibrated regularly.

[0003] Different application scenarios have different requirements for the measurement range and accuracy of carbon dioxide concentration detectors. Most existing calibration devices can only provide a few fixed carbon dioxide concentrations for calibration, which is difficult to meet diverse detection needs. Some calibration devices provide multiple carbon dioxide concentrations for calibration by mixing carbon dioxide gases of different concentrations. However, most of these devices rely on simple gas diffusion principles or use rudimentary stirring methods, which makes it difficult for different gases to be mixed thoroughly and evenly. This can easily lead to uneven concentrations of the standard gas introduced into the detector and significant deviations. Therefore, an automatic calibration device for carbon dioxide concentration detectors is proposed to solve the problems mentioned above. Utility Model Content

[0004] To address the aforementioned technical problems, an automatic calibration device for carbon dioxide concentration detectors is provided. This technical solution solves the problem that different application scenarios have varying requirements for the measurement range and accuracy of carbon dioxide concentration detectors, as mentioned in the background technology. Most existing calibration devices can only provide a few fixed carbon dioxide concentrations for calibration, which is insufficient to meet diverse detection needs. Some calibration devices provide multiple carbon dioxide concentrations for calibration by mixing carbon dioxide gases of different concentrations, but these devices mostly rely on simple gas diffusion principles or use rudimentary stirring methods, making it difficult for different gases to be fully and uniformly mixed. This easily leads to uneven concentrations of the standard gas introduced into the detector, resulting in significant deviations.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] An automatic calibration device for a carbon dioxide concentration detector includes a housing. Inside the housing, from top to bottom, a guide plate and a partition are fixedly connected. Two symmetrically distributed first gas flow channels are penetrated through the upper end of the guide plate. A mesh plate is fixedly connected inside the first gas flow channels. Four evenly distributed first guide blocks are fixedly connected to the upper end of the guide plate. A second gas flow channel is penetrated through the upper end of the partition. Two symmetrically distributed second guide blocks are fixedly connected to the upper end of the partition. Two symmetrically distributed first motors are fixedly installed at the upper end of the housing. The output ends of the first motors penetrate through the upper end of the housing and are fixedly connected to a first drive shaft. Several... The box has a first stirring plate that is evenly distributed. A second motor is fixedly installed at the center of the upper end of the box. The output end of the second motor passes through the upper end of the box and is fixedly connected to a second drive shaft. Several evenly distributed second stirring plates are fixedly connected to the upper and lower ends of the outer surface of the second drive shaft near the second gas flow channel. Several evenly distributed third stirring plates are fixedly connected to the outer surface of the second drive shaft near the bottom inner side of the box. The upper end of the box is connected to six evenly distributed gas source connection pipes. The upper end of the gas source connection pipes is threaded with a gas delivery pipe. The other end of the gas delivery pipe is connected to a standardized gas cylinder. The right end of the box is connected to a gas supply pipe, and the left end of the box is connected to a vacuum connection pipe.

[0007] Preferably, the outer surface of the third stirring plate is provided with a plurality of uniformly distributed through holes.

[0008] Preferably, the gas delivery pipe is equipped with a first solenoid valve and a first flow meter.

[0009] Preferably, an air pump is fixedly connected to the end of the air supply pipe away from the housing, an air supply pipe is fixedly connected to the output end of the air pump, and a second solenoid valve and a second flow meter are installed on the air supply pipe.

[0010] Preferably, a vacuum pump is fixedly connected to the end of the vacuum connecting pipe away from the housing, a vacuum delivery pipe is fixedly connected to the output end of the vacuum pump, and a third solenoid valve is provided on the vacuum connecting pipe.

[0011] Preferably, the lower end of the second drive shaft passes through the upper end of the guide plate and is rotatably connected to the inner bottom end of the housing.

[0012] The advantages of this utility model compared with the prior art are:

[0013] This solution proposes an automatic calibration device for a carbon dioxide concentration detector. By setting up a guide plate, a baffle, a first guide block, a second guide block, a mesh plate, and multiple stirring plates, a highly efficient multi-stage gas mixing system is formed. After the gas enters the chamber, it passes through these components in sequence for pre-mixing, secondary mixing, and tertiary mixing, which effectively improves the uniformity of gas mixing.

[0014] This solution is equipped with six standardized gas cylinders, three of which store carbon dioxide at different fixed concentrations, and the other three store nitrogen for dilution and zero-point calibration. Combined with an automated control system, when calibration is required using carbon dioxide concentrations other than those in the three standardized cylinders, the operator only needs to input the desired concentration into the external control device. The control device will then automatically calculate the required amount of carbon dioxide and diluent gas, and then open the corresponding first solenoid valve to inject the gas to be mixed into the chamber for preparation. This allows for the calibration of carbon dioxide at various concentrations, meeting the calibration needs of carbon dioxide concentration detectors in different scenarios. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the box in this utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the guide plate in this utility model.

[0018] The numbers on the map are:

[0019] 1. Housing; 2. Baffle plate; 201. First gas flow channel; 3. Baffle plate; 301. Second gas flow channel; 4. First guide block; 5. Mesh plate; 6. Second guide block; 7. First motor; 8. First drive shaft; 9. First stirring plate; 10. Second motor; 1001. Second drive shaft; 11. Second stirring plate; 12. Third stirring plate; 13. Gas source connection pipe; 14. Gas delivery pipe; 15. Standard gas cylinder; 16. First solenoid valve; 17. First flow meter; 18. Gas delivery pipe; 19. Gas pump; 20. Gas supply pipe; 21. Second solenoid valve; 22. Second flow meter; 23. Vacuum connection pipe; 24. Vacuum pump; 25. Vacuum delivery pipe; 26. Third solenoid valve. Detailed Implementation

[0020] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0021] Reference Figures 1-3As shown, an automatic calibration device for a carbon dioxide concentration detector includes a housing 1. Inside the housing 1, from top to bottom, a guide plate 2 and a partition plate 3 are fixedly connected. Two symmetrically distributed first gas flow channels 201 are opened through the upper end of the guide plate 2. A mesh plate 5 is fixedly connected inside the first gas flow channels 201. Four evenly distributed first guide blocks 4 are fixedly connected to the upper end of the guide plate 2. A second gas flow channel 301 is opened through the upper end of the partition plate 3. Two symmetrically distributed second guide blocks 6 are fixedly connected to the upper end of the partition plate 3. Two symmetrically distributed first motors 7 are fixedly installed at the upper end of the housing 1. The output end of the first motor 7 passes through the upper end of the housing 1 and is fixedly connected to a first drive shaft 8. Several evenly distributed first... A stirring plate 9 is fixedly installed at the center of the upper end of the housing 1. A second motor 10 is fixedly installed at the output end of the second motor 10 through the upper end of the housing 1 and fixedly connected to a second drive shaft 1001. Several evenly distributed second stirring plates 11 are fixedly connected to the upper and lower ends of the outer surface of the second drive shaft 1001 near the second gas flow channel 301. Several evenly distributed third stirring plates 12 are fixedly connected to the outer surface of the second drive shaft 1001 near the bottom inner side of the housing 1. Six evenly distributed gas source connecting pipes 13 are connected to the upper end of the housing 1. A gas delivery pipe 14 is threaded to the upper end of the gas source connecting pipe 13. The other end of the gas delivery pipe 14 is connected to a standardized gas cylinder 15. A gas supply pipe 18 is connected to the right end of the housing 1. A vacuum connecting pipe 23 is connected to the left end of the housing 1.

[0022] Furthermore, the three standardized gas cylinders 15 located on the front side store medium-concentration, low-concentration, and high-concentration carbon dioxide respectively from left to right. The concentration values ​​of the three types of carbon dioxide are all fixed. The three standardized gas cylinders 15 located on the rear side store nitrogen. The nitrogen in the middle standardized gas cylinder 15 is used for zero-point calibration, and the nitrogen in the standardized gas cylinders 15 on both sides is used to dilute the carbon dioxide.

[0023] Furthermore, the outer surface of the third stirring plate 12 is provided with several evenly distributed through holes.

[0024] Furthermore, a first solenoid valve 16 and a first flow meter 17 are provided on the gas delivery pipe 14.

[0025] Furthermore, the gas source connection pipe 13 serves as a channel for gas to enter the housing 1, and is used to introduce gas from the standardized gas cylinder 15 into the housing 1 for mixing. The gas delivery pipe 14 is used to deliver gas from the standardized gas cylinder 15. The first solenoid valve 16 is used to control the gas flow. The first flow meter 17 is used to monitor the gas flow in real time so as to accurately control the amount of gas entering the housing 1.

[0026] Furthermore, an air pump 19 is fixedly connected to one end of the air supply pipe 18 away from the housing 1, and an air supply pipe 20 is fixedly connected to the output end of the air pump 19. A second solenoid valve 21 and a second flow meter 22 are installed on the air supply pipe 18.

[0027] Furthermore, the gas pump 19 and the gas supply pipe 18 work together to extract the gas from the chamber 1 and deliver it to the detector through the gas supply pipe 20 for calibration. The second solenoid valve 21 and the second flow meter 22 are used to control the gas flow and monitor the gas flow in real time, respectively.

[0028] Furthermore, a vacuum pump 24 is fixedly connected to the end of the vacuum connection pipe 23 away from the housing 1, a vacuum delivery pipe 25 is fixedly connected to the output end of the vacuum pump 24, and a third solenoid valve 26 is provided on the vacuum connection pipe 23.

[0029] Furthermore, the vacuum connecting pipe 23 and the vacuum pump 24 work together to extract the residual gas inside the chamber 1 and transport it to the outside. Before introducing gas into the chamber 1, the gas inside the chamber 1 can be extracted through the vacuum connecting pipe 23 and the vacuum pump 24 to avoid the accuracy of subsequent gas mixing being affected by other gases inside the chamber 1.

[0030] Furthermore, the lower end of the second drive shaft 1001 passes through the upper end of the guide plate 2 and is rotatably connected to the inner bottom end of the housing 1.

[0031] Furthermore, the motor, flow meter, and solenoid valve are all electrically connected to external control equipment.

[0032] Furthermore, when zero-point calibration is required, the zero-point calibration mode is selected on the external control device. At this time, the first solenoid valve 16 corresponding to the standardized gas cylinder 15 containing nitrogen in the middle is opened, and nitrogen is introduced into the housing 1. At the same time, the gas pump 19 is started to deliver the nitrogen to the detector. The first flow meter 17 and the second flow meter 22 will monitor the gas flow in real time to ensure accurate gas delivery. Since nitrogen does not contain carbon dioxide gas, the detection concentration of carbon dioxide is zero, so it can be used for zero-point calibration.

[0033] Furthermore, when it is necessary to directly use the concentration of carbon dioxide in three standardized gas cylinders 15 for calibration, the corresponding first solenoid valve 16 is opened and the gas pump 19 is started to deliver the corresponding concentration of carbon dioxide to the detector. The first flow meter 17 and the second flow meter 22 will monitor the gas flow rate in real time to ensure accurate gas delivery.

[0034] Furthermore, when it is necessary to use carbon dioxide concentrations other than those in the three standardized gas cylinders 15 for calibration, the concentration of carbon dioxide used for calibration is input into the external control device. The control device automatically calculates the required amount of carbon dioxide and diluent gas, and then opens the corresponding first solenoid valve 16 to inject the gas to be mixed into the housing 1. The gas entering the housing 1 will flow towards the mesh plate 5 under the guidance of the guide plate 2 and the first guide block 4. The gas flowing towards the mesh plate 5 will be pre-mixed by the first stirring plate 9 driven by the first motor 7. The pre-mixed gas will flow to the second guide block 6 through the mesh on the mesh plate 5. The mesh on the mesh plate 5 will disperse the gas passing through the first gas flow channel 201, so that the gas passes through in a finer airflow form, increasing the contact area between the gas and the surrounding gas and promoting the uniformity of mixing.

[0035] Furthermore, the premixed gas after passing through the mesh plate 5 will gather towards the center under the action of the two second guide blocks 6. At this time, under the action of the second motor 10, the second drive shaft 1001 will drive the second stirring plate 11 to perform secondary mixing of the gas gathered from both sides. The gas after secondary mixing enters the area where the third stirring plate 12 is located through the second gas flow channel 301. The third stirring plate 12 will perform a third mixing of the gas under the drive of the second motor 10. The through holes opened on the third stirring plate 12 can allow the gas to flow better during the stirring process and avoid insufficient local gas mixing.

[0036] Working Principle: During use, the calibration mode is selected via an external control device. If the zero-point calibration mode is selected, the first solenoid valve 16 corresponding to the standardized gas cylinder 15 containing nitrogen in the middle opens, introducing nitrogen into the chamber 1. Simultaneously, the gas pump 19 starts, delivering the nitrogen to the detector. The first flow meter 17 and the second flow meter 22 monitor the gas flow rate in real time to ensure accurate gas delivery. If a certain concentration of carbon dioxide is selected for calibration, the required carbon dioxide concentration is input via the external control device. If the carbon dioxide concentration is one of the three standardized gas cylinders 15, the first solenoid valve 16 corresponding to that standardized gas cylinder 15 opens, introducing carbon dioxide of that concentration into the chamber 1. Simultaneously, the gas pump 19 starts, delivering the corresponding concentration of carbon dioxide to the detector. The first flow meter 17 and the second flow meter 22 monitor the gas flow rate in real time to ensure accurate gas delivery. If the carbon dioxide concentration is other than that of cylinder 15, the control device will automatically calculate the required amount of carbon dioxide and diluent gas, and then open the corresponding first solenoid valve 16 to inject the gas to be mixed into the chamber 1. Guided by the guide plate 2 and the first guide block 4, the gas flows towards the mesh plate 5. Driven by the first motor 7, the gas is pre-mixed by the first stirring plate 9. The pre-mixed gas then passes through the mesh on the mesh plate 5 to the second guide block 6. The mesh on the mesh plate 5 disperses the gas passing through the first gas flow channel 201, allowing it to pass through in a finer airflow, increasing the contact area between the gas and the surrounding gas, and promoting uniform mixing. After passing through the mesh plate 5, the pre-mixed gas gathers towards the center under the action of the two second guide blocks 6. At this time, under the action of the second motor 10, the second drive shaft 1001 will drive the second stirring plate 11 to perform secondary mixing of the gas gathered from both sides. The gas after secondary mixing enters the area where the third stirring plate 12 is located through the second gas flow channel 301. The third stirring plate 12 will perform a third mixing of the gas under the drive of the second motor 10. The through holes opened on the third stirring plate 12 can allow the gas to flow better during the mixing process and avoid insufficient local gas mixing. After three mixings, the carbon dioxide gas will be delivered to the detector under the action of the air pump 19.

[0037] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. An automatic calibration device for a carbon dioxide concentration detector, characterized in that, The enclosure includes a housing (1), inside which a guide plate (2) and a partition plate (3) are fixedly connected from top to bottom. Two symmetrically distributed first gas flow channels (201) are opened through the upper end of the guide plate (2). A mesh plate (5) is fixedly connected inside the first gas flow channels (201). Four evenly distributed first guide blocks (4) are fixedly connected to the upper end of the guide plate (2). A second gas flow channel (301) is opened through the upper end of the partition plate (3). Two symmetrically distributed second guide blocks (6) are fixedly connected to the upper end of the housing (1). Two symmetrically distributed first motors (7) are fixedly installed at the upper end of the housing (1). The output end of the first motor (7) passes through the upper end of the housing (1) and is fixedly connected to a first drive shaft (8). Several evenly distributed first stirring plates (9) are fixedly connected to the outer surface of the first drive shaft (8). A second motor (10) is fixedly installed at the center of the upper end of the box (1). The output end of the second motor (10) passes through the upper end of the box (1) and is fixedly connected to the second drive shaft (1001). Several evenly distributed second stirring plates (11) are fixedly connected to the upper and lower ends of the outer surface of the second drive shaft (1001) near the second gas flow channel (301). Several evenly distributed third stirring plates (12) are fixedly connected to the lower end of the inner side of the box (1) near the outer surface of the second drive shaft (1001). Six evenly distributed gas source connecting pipes (13) are connected to the upper end of the box (1). A gas conveying pipe (14) is threaded to the upper end of the gas source connecting pipe (13). A standardized gas cylinder (15) is connected to the other end of the gas conveying pipe (14). A gas supply pipe (18) is connected to the right end of the box (1). A vacuum connecting pipe (23) is connected to the left end of the box (1).

2. The automatic calibration device for a carbon dioxide concentration detector according to claim 1, characterized in that: The outer surface of the third stirring plate (12) is provided with several uniformly distributed through holes.

3. The automatic calibration device for a carbon dioxide concentration detector according to claim 1, characterized in that: The gas delivery pipe (14) is equipped with a first solenoid valve (16) and a first flow meter (17).

4. The automatic calibration device for a carbon dioxide concentration detector according to claim 1, characterized in that: An air pump (19) is fixedly connected to one end of the air supply pipe (18) away from the housing (1). An air supply pipe (20) is fixedly connected to the output end of the air pump (19). A second solenoid valve (21) and a second flow meter (22) are installed on the air supply pipe (18).

5. The automatic calibration device for a carbon dioxide concentration detector according to claim 1, characterized in that: A vacuum pump (24) is fixedly connected to the end of the vacuum connecting pipe (23) away from the box (1), and a vacuum delivery pipe (25) is fixedly connected to the output end of the vacuum pump (24). A third solenoid valve (26) is provided on the vacuum connecting pipe (23).

6. The automatic calibration device for a carbon dioxide concentration detector according to claim 1, characterized in that: The lower end of the second drive shaft (1001) passes through the upper end of the guide plate (2) and is rotatably connected to the inner bottom end of the housing (1).

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