Displacement sampling calibration mechanism of aerosol photometer

Abstract

The utility model discloses a displacement sampling calibration mechanism of an aerosol photometer, which comprises a frame, an upper turntable and a lower turntable, the upper turntable is rotatably arranged in a detection chamber of the frame, and a first detection tube and a second detection tube are arranged on the upper turntable. The upper end of the first detection pipe and the upper end of the second detection pipe are located in the detection cavity, a lower rotating disc is rotationally installed on the portion, below the upper rotating disc, of the rack, the upper rotating disc and the lower rotating disc are fixedly connected into a whole through a center shaft, and the center shaft is driven by a rotating power device installed on the rack. A standard aerosol photometer and a to-be-calibrated aerosol photometer are fixedly mounted on the lower turntable; sampling ports of the standard aerosol photometer and the to-be-calibrated aerosol photometer are respectively communicated with the first detection pipe and the second detection pipe through pipelines; the mechanism can change the detection position so as to carry out multi-point detection, so that the detection result is more accurate, and the calibration accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of aerosol photometers, in particular to a displacement sampling and calibration mechanism of an aerosol photometer. Background Art

[0002] Aerosol is a sol formed by solid or liquid as dispersed matter and gas as dispersion medium. It has colloidal properties. Solid and liquid particles in the atmosphere perform Brownian motion and do not settle due to gravity, so the particle concentration is measured by an aerosol photometer. Aerosol photometer is an instrument used to measure the concentration of particulate matter in the atmosphere. It is based on the principle of laser scattering and determines the concentration of particulate matter by measuring the scattering intensity of laser by particles in the atmosphere. When using an aerosol photometer to measure the concentration of particulate matter, reading deviations may occur due to environmental factors and errors in the instrument itself. In order to ensure the accuracy and reliability of the measurement results, the instrument needs to be calibrated.

[0003] At present, a standard aerosol photometer and an aerosol photometer to be calibrated are placed in a closed space, an aerosol airflow is introduced, and sampling is performed through the pipeline connected to the corresponding standard aerosol photometer and the aerosol photometer to be calibrated. After the detection is completed, a comparison calibration is performed. However, the standard aerosol photometer and the aerosol photometer to be calibrated are at different positions in the closed space. Therefore, when sampling, the distribution of the aerosol is not uniform, resulting in inaccurate detection results and inaccurate calibration. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a displacement sampling calibration mechanism for an aerosol photometer, which can change the detection position to perform multi-point detection, make the detection result more accurate, and improve the accuracy of calibration.

[0005] In order to solve the above technical problems, the technical solution of the utility model is: a displacement sampling and calibration mechanism of an aerosol photometer, comprising a frame, and also comprising an upper turntable and a lower turntable, the upper turntable being rotatably arranged in a detection chamber of the frame, the upper turntable being provided with a first detection tube and a second detection tube, the upper ends of the first detection tube and the second detection tube being located in the detection chamber, the lower turntable being rotatably installed on the frame below the upper turntable, the upper turntable and the lower turntable being fixedly connected as a whole through a central axis, the central axis being driven by a rotating power device installed on the frame, the lower turntable being fixedly installed with a standard aerosol photometer and an aerosol photometer to be calibrated, the sampling ports of the standard aerosol photometer and the aerosol photometer to be calibrated being respectively connected to the first detection tube and the second detection tube pipeline.

[0006] As a preferred solution, the first detection tubes and the second detection tubes are evenly distributed relative to the central circumference of the central axis.

[0007] As a preferred solution, a third detection tube and a fourth detection tube are also provided on the upper turntable, and the first detection tube, the second detection tube, the third detection tube and the fourth detection tube are evenly distributed relative to the central circumference of the central axis, and the third detection tube and the fourth detection tube are detachably installed with filter membrane assemblies, and the central axis is a hollow central tube, and the lower ends of the third detection tube and the fourth detection tube are connected to flexible tubes, which pass through the central hole of the central tube and extend downward, and the lower end of the flexible tube is exposed from the central tube for convenient connection with a flow meter and a sampling pump.

[0008] As a preferred solution, the third detection tube and the fourth detection tube are installed in the same manner, a detection tube fixing sleeve is fixed on the upper turntable, the third detection tube is inserted into the detection tube fixing sleeve, a mounting port is provided at the lower end of the detection tube fixing sleeve, a lower threaded sleeve is threadedly installed in the mounting port, the filter membrane assembly is arranged in the mounting port and is pressed and fixed by the lower threaded sleeve, a pipe joint is connected to the lower threaded sleeve, and the flexible tube is connected to the pipe joint.

[0009] As a preferred solution, the central axis is rotatably mounted on the frame, the lower turntable is fixed on the central axis for rotatable mounting, and a universal support ball assembly for supporting the bottom of the lower turntable is installed on the frame.

[0010] As a preferred solution, the upper turntable includes an upper fixing ring fixed on the wall of the detection chamber, an upper clamping ring is fixed to the upper end of the upper fixing ring, a constraint groove is formed between the upper fixing ring and the upper clamping ring, a lower annular guide rail is fixed to the upper end surface of the upper fixing ring, an upper annular guide rail is fixed to the lower end surface of the upper clamping ring, an upper turntable body is rotatably installed in the constraint groove, and a matching structure for matching the upper annular guide rail and the lower annular guide rail is provided on the upper turntable body.

[0011] As a preferred solution, the upper surface of the upper turntable body is provided with an upper matching groove adapted to the upper annular guide rail, and the lower surface of the upper turntable body is provided with a lower matching step adapted to the lower annular guide rail.

[0012] After adopting the above technical scheme, the effect of the utility model is as follows: since the displacement sampling and calibration mechanism of the aerosol photometer includes a frame, an upper turntable and a lower turntable, the upper turntable is rotatably arranged in the detection chamber of the frame, the upper turntable is provided with a first detection tube and a second detection tube, the upper ends of the first detection tube and the second detection tube are located in the detection chamber, and the lower turntable is rotatably installed on the frame below the upper turntable, the upper turntable and the lower turntable are fixedly connected as a whole through a central axis, the central axis is driven by a rotating power device installed on the frame, and a standard aerosol photometer and an aerosol photometer to be calibrated are fixedly installed on the lower turntable, the standard aerosol photometer and the aerosol photometer to be calibrated are fixedly installed The sampling port of the quasi-aerosol photometer is connected with the first detection tube and the second detection tube pipeline respectively; the airflow of aerosol is introduced into the detection chamber, and then the airflow passes through the upper turntable, the first detection tube and the second detection tube, and the standard aerosol photometer and the aerosol photometer to be calibrated are respectively drawn and sampled through the first detection tube and the second detection tube for detection, and then the central axis is driven to rotate by the rotary power device, thereby driving the upper turntable and the lower turntable to rotate, at this time, the standard aerosol photometer and the aerosol photometer to be calibrated and the connected first detection tube and the second detection tube can change the sampling position for sampling; the mechanism can change the detection position to perform multi-point detection, so that the detection result is more accurate and the accuracy of calibration is improved.

[0013] Furthermore, since the first detection tube and the second detection tube are evenly distributed relative to the central circumference of the central axis, it can be ensured that the first detection tube and the second detection tube are evenly installed and distributed in the detection chamber, ensuring accurate detection, thereby performing calibration, and rotating the upper turntable, the first detection tube and the second detection tube can be rotated to the same position for detection, thereby improving accuracy.

[0014] Since the upper turntable is also provided with a third detection tube and a fourth detection tube, the first detection tube, the second detection tube, the third detection tube and the fourth detection tube are evenly distributed relative to the central circumference of the central axis, and the filter membrane assembly is detachably installed on the third detection tube and the fourth detection tube, the central axis is a hollow central tube, and the lower ends of the third detection tube and the fourth detection tube are connected with flexible tubes, the flexible tubes pass through the central hole of the central tube and extend downward, and the lower ends of the flexible tubes are exposed from the central tube for easy connection with the flow meter and the sampling pump; the first detection tube, the second detection tube, the third detection tube and the fourth detection tube are respectively circumferentially installed on four Angle, thereby increasing the diversity of detection, and after the first detection tube, the second detection tube, the third detection tube and the fourth detection tube are distributed circumferentially, it can ensure the uniformity of detection. When the aerosol passes through the upper turntable in the detection chamber, multi-point detection is performed to improve accuracy; and by using the sampling pump to evacuate air, the airflow can be drawn into the central axis, and the aerosol will be separated by the filter membrane assembly and be in the filter membrane assembly. At the same time, the flow meter will also calculate the amount of flow extracted, and by weighing the filter membrane assembly and comparing the weight difference before and after, the same detection can be performed, so as to compare and calibrate with the standard aerosol photometer and the aerosol photometer to be calibrated.

[0015] Since the third detection tube and the fourth detection tube are installed in the same way, a detection tube fixing sleeve is fixed on the upper turntable, the third detection tube is inserted into the detection tube fixing sleeve, and a mounting port is provided at the lower end of the detection tube fixing sleeve, a lower threaded sleeve is threadedly installed in the mounting port, the filter membrane assembly is arranged in the mounting port and is pressed and fixed by the lower threaded sleeve, a pipe joint is connected to the lower threaded sleeve, and the flexible tube is connected to the pipe joint; the installation of the third detection tube is facilitated by the detection tube fixing sleeve, and the disassembly and assembly is completed by directly inserting or pulling out, and then the detection tube fixing sleeve is threadedly matched with the lower threaded sleeve, so that the filter membrane assembly can be pressed and fixed by rotating the lower threaded sleeve, which is also convenient for disassembly and assembly, and improves installation efficiency, and the pipe joint can also facilitate the connection of the flexible tube.

[0016] Since the central axis is rotatably mounted on the frame, the lower turntable is fixed on the central axis for rotatable mounting, and a universal support ball assembly for supporting the bottom of the lower turntable is installed on the frame. The universal support ball assembly can effectively support the lower turntable without affecting the rotation of the lower turntable.

[0017] Furthermore, since the upper turntable includes an upper fixing ring fixed on the wall of the detection chamber, an upper clamping ring is fixed on the upper end of the upper fixing ring, a constraint groove is formed between the upper fixing ring and the upper clamping ring, a lower annular guide rail is fixed on the upper end surface of the upper fixing ring, and an upper annular guide rail is fixed on the lower end surface of the upper clamping ring, an upper turntable body is rotatably installed in the constraint groove, and a matching structure for matching the upper annular guide rail and the lower annular guide rail is provided on the upper turntable body; in this way, the upper turntable body can rotate around the central axis through the matching structure, and at the same time is limited to rotate in the constraint groove, which is stable and reliable.

[0018] Since the upper surface of the upper turntable body is provided with an upper matching groove adapted to the upper annular guide rail, and the lower surface of the upper turntable body is provided with a lower matching step adapted to the lower annular guide rail, the upper matching groove can match with the upper annular guide rail, and the lower matching step can match with the lower annular guide rail, thereby ensuring the stability of sliding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0021] Figure 2 It is a cross-sectional view of an embodiment of the utility model;

[0022] Figure 3 yes Figure 2 A partial enlarged view of point A;

[0023] Figure 4 yes Figure 2 A partial enlarged view of point B;

[0024] In the accompanying drawings: 1. frame; 2. upper turntable; 3. lower turntable; 4. detection chamber; 5. first detection tube; 6. second detection tube; 7. central axis; 8. standard aerosol photometer; 9. aerosol photometer to be calibrated; 10. third detection tube; 11. fourth detection tube; 12. flexible tube; 13. filter membrane assembly; 14. detection tube fixing sleeve; 15. mounting port; 16. lower threaded sleeve; 17. pipe joint; 18. sealing ring; 19. universal support ball assembly; 20. upper fixing ring; 21. upper clamping ring; 22. constraint groove; 23. lower annular guide rail; 24. upper annular guide rail; 25. upper matching groove; 26. lower matching step; 27. rotating motor; 28. driving pulley; 29. ​​driven pulley; 30. conveyor belt. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below through specific embodiments.

[0026] like Figures 1 to 4As shown, a displacement sampling and calibration mechanism of an aerosol photometer includes a frame 1, and also includes an upper turntable 2 and a lower turntable 3. The upper turntable 2 is rotatably arranged in a detection chamber 4 of the frame 1. A first detection tube 5 and a second detection tube 6 are arranged on the upper turntable 2. The upper ends of the first detection tube 5 and the second detection tube 6 are located in the detection chamber 4. The lower turntable 3 is rotatably installed on the frame 1 below the upper turntable 2. The upper turntable 2 and the lower turntable 3 are fixedly connected as a whole through a central axis 7. The central axis 7 is driven by a rotating power device installed on the frame 1. A standard aerosol photometer 8 and an aerosol photometer to be calibrated 9 are fixedly installed on the lower turntable 3. The sampling ports of the standard aerosol photometer 8 and the aerosol photometer to be calibrated 9 are respectively connected to the first detection tube 5 and the second detection tube 6 pipeline.

[0027] In this embodiment, the first detection tube 5 and the second detection tube 6 are evenly distributed relative to the central circumference of the central axis 7; this ensures that the first detection tube 5 and the second detection tube 6 are evenly installed and distributed in the detection chamber 4, ensuring accurate detection, so as to perform calibration, and rotate the upper turntable 2, so that the first detection tube 5 and the second detection tube 6 can be rotated to the same position for detection, thereby improving accuracy.

[0028] Furthermore, the upper turntable 2 is also provided with a third detection tube 10 and a fourth detection tube 11, the first detection tube 5, the second detection tube 6, the third detection tube 10 and the fourth detection tube 11 are evenly distributed relative to the central circumference of the central axis 7, the third detection tube 10 and the fourth detection tube 11 are detachably installed with a filter membrane assembly 13, the central axis 7 is a hollow central tube, the lower ends of the third detection tube 10 and the fourth detection tube 11 are connected with a flexible tube 12, the flexibility passes through the central hole of the central tube and extends downward, the lower end of the flexible tube 12 is exposed from the central tube for easy connection with the flow meter and the sampling pump; the first detection tube 5, the second detection tube 6, the third detection tube 10 and the fourth detection tube 11 are respectively circumferentially installed At the four corners, the diversity of detection is increased, and after the first detection tube 5, the second detection tube 6, the third detection tube 10 and the fourth detection tube 11 are distributed circumferentially, the uniformity of detection can be ensured. When the aerosol passes through the upper turntable 2 in the detection chamber 4, multi-point detection is performed to improve accuracy. By pumping air through the sampling pump, the airflow can be pumped into the central axis 7, and the aerosol will be separated by the filter membrane assembly 13 and be in the filter membrane assembly 13. At the same time, the flow meter will also calculate the amount of flow extracted, and by weighing the filter membrane assembly 13 and comparing the weight difference before and after, the detection can also be carried out, so as to compare and calibrate with the standard aerosol photometer 8 and the aerosol photometer to be calibrated 9. The sampling pump and the flow meter are not shown in the accompanying drawings.

[0029] like Figure 3As shown, the third detection tube 10 and the fourth detection tube 11 are installed in the same manner, a detection tube fixing sleeve 14 is fixed on the upper turntable 2, the third detection tube 10 is inserted into the detection tube fixing sleeve 14, a mounting port 15 is provided at the lower end of the detection tube fixing sleeve 14, a lower threaded sleeve 16 is installed with the inner thread of the mounting port 15, the filter membrane assembly 13 is arranged in the mounting port 15 and is pressed and fixed by the lower threaded sleeve 16, a pipe joint 17 is connected to the lower threaded sleeve 16, and the flexible tube 12 is connected to the pipe joint 17; the detection tube fixing sleeve 14 facilitates the third detection tube 10 to be installed. 0, directly insert or pull out to complete the disassembly and assembly, and a sealing ring 18 is provided in the detection tube fixing sleeve 14 to improve the sealing effect, and then the detection tube fixing sleeve 14 is threadedly matched with the lower threaded sleeve 16, so that the filter membrane assembly 13 can be pressed and fixed by simply rotating the lower threaded sleeve 16. The filter membrane assembly 13 includes an upper pressing block, a filter membrane and a lower pressing block. The upper pressing block contacts with the detection tube fixing sleeve 14, and the lower pressing block contacts with the lower threaded sleeve 16. The aerosol is filtered through the filter membrane, so that the aerosol remains on the filter membrane, which is convenient for weighing and calculation, and also convenient for disassembly and assembly, thereby improving installation efficiency. The pipe joint 17 can also facilitate the connection of the flexible tube 12.

[0030] The central axis 7 is rotatably mounted on the frame 1, and the lower turntable 3 is fixed on the central axis 7 for rotatable mounting. A universal support ball assembly 19 is installed on the frame 1 to support the bottom of the lower turntable 3; in this way, the central axis 7 will not contact the frame 1 when rotating, and at the same time, the lower turntable 3 can be effectively supported by the universal support ball assembly 19, so that the central axis 7 only needs to drive the lower turntable 3 to rotate, and is supported by the universal support ball assembly 19, which is simple and reliable; the rotating power device includes a rotating motor 27, which is fixedly mounted on the frame 1, and a driving pulley 28 and a driven pulley 29 are provided on the frame 1. The central axis 7 is rotatably mounted on the frame 1, and at the same time, the driven pulley 29 is fixedly mounted on the central axis 7, and the main shaft of the rotating motor 27 is connected to the driving pulley 28, so that the rotation of the rotating motor 27 can drive the driving pulley 28 to rotate, and the driven pulley 29 is driven to rotate by the conveyor belt 30, and the diameter of the driving pulley 28 is smaller than the diameter of the driven pulley 29; the universal support ball assembly is an existing structure, so it is not described in detail in the text.

[0031] In this embodiment, the upper turntable 2 includes an upper fixing ring 20 fixed on the wall of the detection chamber 4, an upper clamping ring 21 is fixed to the upper end of the upper fixing ring 20, a constraint groove 22 is formed between the upper fixing ring 20 and the upper clamping ring 21, a lower annular guide rail 23 is fixed to the upper end surface of the upper fixing ring 20, an upper annular guide rail 24 is fixed to the lower end surface of the upper clamping ring 21, the upper turntable 2 body is rotatably installed in the constraint groove 22, and a matching structure for matching the upper annular guide rail 24 and the lower annular guide rail 23 is provided on the upper turntable 2 body; in this way, the upper turntable 2 body can rotate around the central axis 7 through the matching structure, and at the same time is limited to rotate in the constraint groove 22, which is stable and reliable.

[0032] Furthermore, the upper surface of the upper turntable 2 body is provided with an upper matching groove 25 adapted to the upper annular guide rail 24, and the lower surface of the upper turntable 2 body is provided with a lower matching step 26 adapted to the lower annular guide rail 23. The upper matching groove 25 can snap the upper annular guide rail 24 into place, and the lower annular guide rail 23 is installed on the lower matching step 26. In this way, the upper turntable 2 body can rotate around the central axis 7, and the upper annular guide rail 24 and the lower annular guide rail 23 can also assist in smooth rotation, thereby improving the use effect.

[0033] The working principle of this embodiment is as follows: after the aerosol flows into the detection chamber 4 along with the air flow, it flows to the main body of the upper turntable 2, passes through the first detection tube 5, the second detection tube 6, the third detection tube 10 and the fourth detection tube 11. At this time, the standard aerosol photometer 8 and the aerosol photometer to be calibrated 9 are sampled and detected through the first detection tube 5 and the second detection tube 6, the third detection tube 10 and the fourth detection tube 11 are sampled by the sampling pump, and the extracted flow rate is calculated by the flowmeter, and then the rotating motor 27 drives the upper turntable 2 and the lower turntable 3 to rotate, adjusts the positions of the first detection tube 5, the second detection tube 6, the third detection tube 10 and the fourth detection tube 11, and detects again. After multiple detections, the aerosol photometer to be calibrated is compared and calibrated.

Claims

1. A displacement sampling and calibration mechanism for an aerosol photometer, comprising a frame, characterized in that: It also includes an upper turntable and a lower turntable, the upper turntable is rotatably arranged in the detection chamber of the frame, the upper turntable is provided with a first detection tube and a second detection tube, the upper ends of the first detection tube and the second detection tube are located in the detection chamber, and the lower turntable is rotatably installed on the frame below the upper turntable, the upper turntable and the lower turntable are fixedly connected as a whole through a central axis, the central axis is driven by a rotating power device installed on the frame, and a standard aerosol photometer and an aerosol photometer to be calibrated are fixedly installed on the lower turntable, and the sampling ports of the standard aerosol photometer and the aerosol photometer to be calibrated are respectively connected to the first detection tube and the second detection tube pipeline.

2. The displacement sampling and calibration mechanism of the aerosol photometer according to claim 1, characterized in that: The first detection tubes and the second detection tubes are evenly distributed relative to the central circumference of the central axis.

3. The displacement sampling and calibration mechanism of the aerosol photometer according to claim 2, characterized in that: A third detection tube and a fourth detection tube are also provided on the upper turntable. The first detection tube, the second detection tube, the third detection tube and the fourth detection tube are evenly distributed relative to the central circumference of the central axis. The third detection tube and the fourth detection tube are detachably installed with filter membrane assemblies. The central axis is a hollow central tube. The lower ends of the third detection tube and the fourth detection tube are connected to flexible tubes. The flexible tubes penetrate the central hole of the central tube and extend downward. The lower end of the flexible tube is exposed from the central tube for easy connection with a flow meter and a sampling pump.

4. The displacement sampling and calibration mechanism of the aerosol photometer according to claim 3, characterized in that: The third detection tube and the fourth detection tube are installed in the same manner. A detection tube fixing sleeve is fixed on the upper turntable, and the third detection tube is inserted into the detection tube fixing sleeve. A mounting port is provided at the lower end of the detection tube fixing sleeve, and a lower threaded sleeve is threadedly installed in the mounting port. The filter membrane assembly is arranged in the mounting port and is pressed and fixed by the lower threaded sleeve. A pipe joint is connected to the lower threaded sleeve, and the flexible tube is connected to the pipe joint.

5. The displacement sampling and calibration mechanism of the aerosol photometer according to claim 1, characterized in that: The central axis is rotatably mounted on the frame, the lower turntable is fixed on the central axis for rotatable mounting, and a universal support ball assembly for supporting the bottom of the lower turntable is mounted on the frame.

6. The displacement sampling and calibration mechanism of the aerosol photometer according to claim 1, characterized in that: The upper turntable includes an upper fixing ring fixed on the wall of the detection chamber, an upper clamping ring is fixed to the upper end of the upper fixing ring, a constraint groove is formed between the upper fixing ring and the upper clamping ring, a lower annular guide rail is fixed to the upper end surface of the upper fixing ring, an upper annular guide rail is fixed to the lower end surface of the upper clamping ring, an upper turntable body is rotatably installed in the constraint groove, and a matching structure for matching the upper annular guide rail and the lower annular guide rail is provided on the upper turntable body.

7. The displacement sampling and calibration mechanism of the aerosol photometer according to claim 6, characterized in that: The upper surface of the upper turntable body is provided with an upper matching groove matched with the upper annular guide rail, and the lower surface of the upper turntable body is provided with a lower matching step matched with the lower annular guide rail.

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