A particulate matter gradient concentration generation system

Abstract

This invention provides a particulate matter gradient concentration generation system, belonging to the technical field of testing equipment. It includes a particulate matter generating device, a particulate matter conveying device, and a particulate matter sampling device. The particulate matter generating device includes a housing and a first pipe. The housing has a support platform for combustion of a combustible material, and the first pipe has an air inlet for balancing the air pressure within the housing. The particulate matter conveying device includes a particulate matter pipe and a transition chamber. The particulate matter sampling device is located on the particulate matter pipe. By controlling the amount of combustible material burning on the support platform, the concentration of particulate matter entering the particulate matter pipe can be controlled. The particulate matter concentration in the particulate matter pipe is sampled by the particulate matter sampling device, and the concentration in the particulate matter pipe is detected by a standard particulate matter monitor. This allows for a gradient change in the particulate matter concentration within the particulate matter pipe, thus enabling testing of the particulate matter monitor under test at different concentrations.

Description

Technical Field

[0001] This invention belongs to the technical field of particulate matter monitoring and testing equipment, and specifically relates to a particulate matter gradient concentration generation system. Background Technology

[0002] Particulate matter monitors are used to monitor the concentration of particulate matter in the air. After production, the performance of particulate matter monitors needs to be tested. In existing technology, particulate matter is transported into a particulate matter pipeline through a particulate matter generator. The particulate matter monitor under test then draws the particulate matter into the pipeline through a hose and displays the corresponding value. A standard particulate matter monitor also draws particulate matter into the pipeline through a hose. By comparing the values ​​of the standard particulate matter monitor and the particulate matter monitor under test, the detection performance of the particulate matter monitor under test can be tested.

[0003] However, the particle concentration in the particulate matter pipeline is uniform during the above test process, making it impossible to achieve a gradient concentration test process. Summary of the Invention

[0004] This invention provides a particulate matter gradient concentration generation system, which aims to solve the technical problem that existing technologies cannot achieve gradient concentration testing.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] A particulate matter gradient concentration generation system is provided, comprising:

[0007] A particulate matter generator includes a housing and a first pipe connected to the housing. The housing has a support platform for combustion of a combustible material, and the first pipe has an air inlet for balancing the air pressure inside the housing.

[0008] A particulate matter conveying device includes a particulate matter pipeline and a transition chamber, the transition chamber being connected to a first pipeline; one end of the particulate matter pipeline is connected to the transition chamber, and the other end of the transition chamber is connected to a fan; the particulate matter pipeline has several outlet pipes for connecting to the air inlet of a particulate matter monitoring instrument; and

[0009] A particulate matter sampling device is installed on the particulate matter pipeline; the particulate matter sampling device is used to sequentially connect the air outlet pipe to a standard particulate matter monitor.

[0010] In one possible implementation, an air inlet is provided at the bottom of the transition chamber near the first duct, and a filter element is provided at the location of the air inlet.

[0011] In one possible implementation, the box has an opening and closing door on one side, one side of the opening and closing door is hinged to the box, and the other end is detachably connected to the box.

[0012] The support platform has one or more support trays for supporting the combustible material, and the support trays are detachably connected to the support platform.

[0013] In one possible implementation, the first pipe has a horizontally arranged pull-out opening above the air inlet, and the distance between the two ends of the pull-out opening is the diameter of the first pipe; the particulate generating device further includes a pull-out plate, which is slidably engaged with the pull-out opening; and an elastic strip is fixedly provided at the top or bottom of the pull-out opening for abutting against the pull-out plate.

[0014] The elastic strip is used to press against the pull-out plate to fix the position of the pull-out plate after it has slid.

[0015] In one possible implementation, the top of the housing is provided with a support platform, and the support platform is provided with a drive structure for driving the pull-out panel to slide.

[0016] In one possible implementation, the driving structure includes:

[0017] A rack is slidably disposed on the support platform, and the rack is fixedly connected to the pull-out plate;

[0018] The gear meshes with the rack;

[0019] A drive motor is fixed on the support platform, and the drive shaft of the drive motor is connected to the gear.

[0020] In one possible implementation, the transition chamber is provided with a uniform air cone, the tip of which faces the fan end of the transition chamber.

[0021] In one possible implementation, the particulate matter sampling device includes:

[0022] The housing is fixed to the outer peripheral wall of the particulate matter pipeline; the housing has a second vent pipe for communicating with the air inlet of a standard particulate matter monitor;

[0023] A rotating shaft is rotatably disposed within the housing, and the axis of the rotating shaft is parallel to the axis of the particulate matter conduit; and

[0024] Several connecting pipes are connected to the housing along the length of the rotating shaft; the bottom end of each connecting pipe extends into the housing and contacts the outer peripheral wall of the rotating shaft; the other end of each connecting pipe is connected to the corresponding air outlet pipe.

[0025] The rotating shaft is provided with an air passage at the position corresponding to the connecting pipe, and a plurality of the air passages are spirally distributed along the axial direction of the rotating shaft.

[0026] When one of the air passages is connected to the corresponding connecting pipe, the other air passages are misaligned with their corresponding connecting pipes.

[0027] In one possible implementation, the particulate matter sampling device further includes a power component connected to one end of the housing; the driving end of the power component is connected to one end of the rotating shaft, and the power component is used to drive the rotating shaft to rotate by a preset angle.

[0028] In one possible implementation, a branch pipe is connected to the outer peripheral wall of the vent pipe, and the branch pipe is in communication with the connecting pipe.

[0029] This invention provides a particulate matter gradient concentration generation system. Compared with existing technologies, by controlling the amount of combustion of combustibles on the support platform, the concentration of particulate matter entering the particulate matter pipeline can be controlled. A particulate matter sampling device samples the particulate matter concentration within the pipeline, and a standard particulate matter monitor detects the concentration. This allows for a gradient change in particulate matter concentration within the pipeline, enabling testing of the particulate matter monitor at different concentrations. A fan provides power, allowing outside air to flow into the particulate matter pipeline. Once airflow is formed within the pipeline, it draws particulate matter from the chamber into the pipeline, mixing the particulate matter with the air. An air inlet on the first pipeline balances the air pressure within the chamber, preventing negative pressure from occurring. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of a particulate matter gradient concentration generation system provided in an embodiment of the present invention;

[0031] Figure 2 for Figure 1 Enlarged diagram of section A in the middle;

[0032] Figure 3 This is an enlarged schematic diagram of part B in diagram 1;

[0033] Figure 4 A schematic diagram of the uniform air cone portion of a particulate matter gradient concentration generation system provided in an embodiment of the present invention;

[0034] Figure 5 for Figure 4 Enlarged diagram of section C;

[0035] Figure 6This is a schematic diagram of the cooperation between the pull plate and the first pipe in a particulate matter gradient concentration generation system provided in an embodiment of the present invention;

[0036] Figure 7 A cross-sectional schematic diagram of the housing portion of a particulate matter gradient concentration generation system provided in an embodiment of the present invention;

[0037] Figure 8 This is a schematic diagram of the connecting pipe and rotating shaft of a particulate matter gradient concentration generation system provided in an embodiment of the present invention.

[0038] Explanation of reference numerals in the attached drawings: 1. Particulate matter generator; 11. Housing; 111. Supporting platform; 112. Opening and closing door; 113. Supporting tray; 114. Supporting column; 115. Insertion hole; 12. First pipe; 121. Air inlet; 122. Pull-out port; 13. Pull-out plate; 14. Elastic strip; 15. Supporting platform; 16. Drive structure; 161. Rack; 162. Gear; 163. Drive motor; 17. Uniform air cone; 2. Particulate matter conveying device; 21. Particulate matter pipe; 211. Air outlet pipe; 22. Transition chamber; 23. Filter component; 3. Particulate matter sampling device; 31. Housing; 311. Second air vent pipe; 32. Rotating shaft; 321. Air passage; 33. Connecting pipe; 34. Power component; 35. Branch pipe; 36. Support plate; 37. Limiting frame; 38. Tightening bolt. Detailed Implementation

[0039] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0040] Please refer to the following: Figures 1 to 8The present invention provides a particulate matter gradient concentration generation system. The particulate matter gradient concentration generation system includes a particulate matter generating device 1, a particulate matter conveying device 2, and a particulate matter sampling device 3. The particulate matter generating device 1 includes a housing 11 and a first pipe 12 connected to the housing 11. The housing 11 has a support platform 111 for combustion of combustibles, and the first pipe 12 has an air inlet 121 for balancing the air pressure inside the housing 11. The particulate matter conveying device 2 includes a particulate matter pipe 21 and a transition chamber 22, the transition chamber 22 being connected to the first pipe 12. One end of the particulate matter pipe 21 is connected to the transition chamber 22, and the other end of the transition chamber 22 is connected to a fan. The particulate matter pipe 21 has several outlet pipes 211 for connecting to the air inlets 121 of a particulate matter monitoring instrument. A switch valve is connected to the outlet pipe 211; the switch valve is prior art and will not be described further here. The particulate matter sampling device 3 is installed on the particulate matter pipeline 21; the particulate matter sampling device 3 is used to connect the exhaust pipe 211 to the standard particulate matter monitor in sequence.

[0041] This invention provides a particulate matter gradient concentration generation system. Compared with existing technologies, by controlling the amount of combustion of combustibles on the support platform 111, the concentration of particulate matter entering the particulate matter pipe 21 can be controlled. A particulate matter sampling device 3 samples the particulate matter concentration within the pipe 21, and a standard particulate matter monitor detects the concentration. This allows for a gradient change in particulate matter concentration within the pipe 21, enabling testing of the particulate matter monitor at different concentrations. A fan provides power, allowing outside air to flow into the particulate matter pipe 21. After airflow is formed within the pipe 21, it draws particulate matter from the housing 11 into the pipe 21, mixing the particulate matter with the air. An air inlet 121 on the first pipe 12 balances the air pressure within the housing 11, preventing negative pressure. The particulate matter pipe 21 is connected to an exhaust gas treatment device, which is existing technology and will not be described further. By connecting the particulate matter pipe 21 to the exhaust gas treatment equipment, the exhaust gas from the particulate matter pipe 21 can be treated, reducing environmental pollution.

[0042] In some embodiments, such as Figures 1 to 8 As shown, an air inlet is provided at the bottom of the transition chamber 22 near the first pipe 12, and a filter component 23 is provided at the air inlet.

[0043] It should be noted that by installing a filter component 23 at the bottom of the transition chamber 22, the air can be filtered, reducing the amount of large debris entering the transition chamber 22. The main function of the filter component 23 is to filter the air; any structure capable of filtering air can be used, such as filter cotton, but it is not limited to filter cotton.

[0044] In some embodiments, such as Figures 1 to 8 As shown, a door 112 is provided on one side of the housing 11. One side of the door 112 is hinged to the housing 11, and the other end is detachably connected to the housing 11. The support platform 111 has one or more support trays 113 for supporting the combustible material, and the support trays 113 are detachably connected to the support platform 111.

[0045] In some embodiments, such as Figures 1 to 8 As shown, a door 112 is provided on one side of the housing 11. One side of the door 112 is hinged to the housing 11, and the other end is detachably connected to the housing 11. The support platform 111 has one or more support trays 113 for supporting the combustibles. The support trays 113 are detachably connected to the support platform 111.

[0046] Specifically, a support column 114 is fixedly provided at the bottom of the support tray 113, and the support platform 111 has an insertion hole 115 for inserting and engaging with the support column 114. A magnet is provided on the other side of the opening and closing door 112, and when the opening and closing door 112 is closed, the other side of the opening and closing door 112 is attracted to the box body 11. The support tray 113 is inserted and engaged with the insertion hole 115 on the support platform 111 through the support column 114, which can both position the support tray 113 and facilitate the removal of the support tray 113 from the support platform 111 for the disposal of the ash from the burning materials.

[0047] In some embodiments, such as Figures 1 to 8 As shown, the first pipe 12 has a horizontally arranged pull-out port 122 above the air inlet 121. The distance between the two ends of the pull-out port 122 is the diameter of the first pipe 12. The particulate matter generating device 1 also includes a pull-out plate 13, which is slidably engaged with the pull-out port 122. An elastic strip 14 is fixedly provided at the top or bottom of the pull-out port 122 for abutting against the pull-out plate 13. The elastic strip 14 is used to press against the pull-out plate 13 to fix the position of the pull-out plate 13 after sliding.

[0048] It should be noted that by sliding the pull-out plate 13, its length within the first pipe 12 can be changed, thereby facilitating the adjustment of the flow rate of particles from the housing 11 into the transition chamber 22. This allows for control over the mixing degree of particles with air in the transition chamber 22, enabling the particulate matter monitor to detect solid particles of different concentrations. The elastic strip 14 on the pull-out opening 122 ensures a secure connection between the pull-out plate 13 and the opening. After the pull-out plate 13 is pulled outwards a certain distance, the elastic strip 14's clamping action reduces the likelihood of the pull-out plate 13 detaching from the opening 122.

[0049] In some embodiments, such as Figures 1 to 8As shown, the top of the housing 11 is provided with a support platform 15, and the support platform 15 is provided with a drive structure 16 for driving the sliding plate 13 to slide. The drive structure 16 includes a rack 161, a gear 162 and a drive motor 163; the rack 161 is slidably disposed on the support platform 15 and is fixedly connected to the sliding plate 13; the gear 162 meshes with the rack 161; the drive motor 163 is fixed on the support platform 15, and the drive shaft of the drive motor 163 is connected to the gear 162.

[0050] It should be noted that the drive motor 163 can drive the gear 162 to rotate, which in turn can drive the rack 161 to move. Through the above driving method, the pull plate 13 can be driven to slide, thus adjusting the concentration of particulate matter entering the transition chamber 22.

[0051] In some embodiments, such as Figures 1 to 8 As shown, a uniform air cone 17 is provided inside the transition chamber 22, with the tip of the uniform air cone 17 facing the fan end of the transition chamber 22.

[0052] It should be noted that the uniform air cone 17 is fixed to the inner peripheral wall of the transition chamber 22 by a connecting rod; by setting the uniform air cone 17 in the transition chamber 22, the particulate matter in the transition chamber 22 can be mixed with the air evenly, thereby making the concentration of particulate matter entering the particulate matter pipe 21 more uniform.

[0053] In some embodiments, such as Figures 1 to 8 As shown, the particulate matter sampling device 3 includes a housing 31, a rotating shaft 32, and several connecting pipes 33. The housing 31 is fixed to the outer peripheral wall of the particulate matter pipeline 21. The housing 31 has a second vent pipe 311 for communicating with the air inlet 121 of a standard particulate matter monitor. The rotating shaft 32 is rotatably disposed inside the housing 31, and the axis of the rotating shaft 32 is parallel to the axis of the particulate matter pipeline 21. Several connecting pipes 33 are connected to the housing 31 along the length of the rotating shaft 32. The bottom end of each connecting pipe 33 extends into the housing 31 and contacts the outer peripheral wall of the rotating shaft 32. The other end of each connecting pipe 33 is connected to the corresponding air outlet pipe 211. The rotating shaft 32 is provided with an air passage 321 at the position corresponding to the connecting pipe 33, and the several air passages 321 are spirally distributed along the axial direction of the rotating shaft 32. When one of the air passages 321 is connected to the corresponding connecting pipe 33, the other air passages 321 are staggered with their corresponding connecting pipes 33.

[0054] It should be noted that after rotating the shaft 32 by a preset angle, one of the connecting pipes 33 can be connected to the corresponding air passage 321, which facilitates the standard particulate matter monitor to sample the particulate matter at the corresponding air outlet 211 and obtain the particulate matter concentration at that location. Rotating the shaft 32 several times in sequence can connect each of the air outlets 211 on the particulate matter pipeline 21 to the standard particulate matter monitor, which facilitates the standard particulate matter monitor to detect the particulate matter concentration at each of the air outlets 211. When the particulate matter concentration at each of the air outlets 211 reaches the preset concentration, the particulate matter monitor under test draws in the particulate matter in the particulate matter pipeline 21, and at this time, the detection performance of the particulate matter monitor under test is tested.

[0055] In some embodiments, such as Figures 1 to 8 As shown, the particulate matter sampling device 3 also includes a power component 34, which is connected to one end of the housing 31; the driving end of the power component 34 is connected to one end of the rotating shaft 32, and the power component 34 is used to drive the rotating shaft 32 to rotate a preset angle.

[0056] It should be noted that the power component 34 can be a stepper motor, which can control the rotating shaft 32 to rotate at a certain angle, thereby facilitating the sequential connection of the exhaust pipe 211 with the inside of the housing 31. After the particulate matter concentration in the particulate matter pipeline 21 reaches the preset concentration, the standard particulate matter monitor can randomly sample and detect the particulate matter concentration at several locations of the exhaust pipe 211.

[0057] In some embodiments, such as Figures 1 to 8 As shown, a branch pipe 35 is connected to the outer peripheral wall of the vent pipe 211, and the branch pipe 35 is connected to the connecting pipe 33.

[0058] It should be noted that the exhaust pipe 211 needs to be connected to the particulate matter monitor via a flexible hose. Therefore, a branch pipe 35 is provided on the exhaust pipe 211 to facilitate the connection between the exhaust pipe 211 and the connecting pipe 33. The branch pipe 35 is a flexible hose, and its position can be adjusted arbitrarily. Even if there is an installation error in the housing 31, the branch pipe 35 can still be connected to the connecting pipe 33.

[0059] In some embodiments, such as Figures 1 to 8 As shown, a support plate 36 is horizontally fixed on the outer peripheral wall of the particulate matter pipe 21, and the box body 31 is placed on the support plate 36. A limiting frame 37 is provided on the support plate 36, and the inner peripheral wall of the limiting frame 37 is used to contact the outer peripheral wall of the box body 31 to circumferentially limit the box body 31. The limiting frame 37 is provided with a threaded hole for facing the box body 31, and a clamping bolt 38 is provided at the threaded hole of the limiting frame 37; one end of the clamping bolt 38 is used to clamp against the outer peripheral wall of the box body 31.

[0060] It should be noted that after the box 31 is placed on the support plate 36, the outer peripheral wall of the box 31 contacts the inner peripheral wall of the limiting frame 37, so the limiting frame 37 can circumferentially limit the box 31. Then, by rotating the tightening bolt 38, the box 31 can be further fixed on the support plate 36, improving the stability of the box 31 during use.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A particulate matter gradient concentration generation system, characterized in that, include: A particulate matter generator includes a housing and a first pipe connected to the housing. The housing has a support platform for combustion of a combustible material, and the first pipe has an air inlet for balancing the air pressure inside the housing. A particulate matter conveying device includes a particulate matter pipeline and a transition chamber, the transition chamber being connected to the first pipeline; one end of the particulate matter pipeline is connected to the transition chamber, and the other end of the transition chamber is connected to a fan; the particulate matter pipeline has several outlet pipes for connecting to the air inlet of a particulate matter monitor to be tested. as well as A particulate matter sampling device is installed on the particulate matter pipeline; the particulate matter sampling device is used to sequentially connect the outlet pipe to a standard particulate matter monitor; the particulate matter sampling device includes: The housing is fixed to the outer peripheral wall of the particulate matter pipeline; the housing has a second vent pipe for communicating with the air inlet of a standard particulate matter monitor; A rotating shaft is rotatably disposed within the housing, and the axis of the rotating shaft is parallel to the axis of the particulate matter conduit; and Several connecting pipes are connected to the housing along the length of the rotating shaft; the bottom end of each connecting pipe extends into the housing and contacts the outer peripheral wall of the rotating shaft; the other end of each connecting pipe is connected to the corresponding air outlet pipe. The rotating shaft is provided with an air passage at the position corresponding to the connecting pipe, and the air passages are spirally distributed along the axial direction of the rotating shaft; when one of the air passages is connected to the corresponding connecting pipe, the other air passages are staggered with their corresponding connecting pipes.

2. The particulate matter gradient concentration generation system as described in claim 1, characterized in that, An air inlet is located at the bottom of the transition chamber near the first pipe, and a filter is installed at the air inlet.

3. The particulate matter gradient concentration generation system as described in claim 1, characterized in that, The box has an opening and closing door on one side, one side of which is hinged to the box, and the other end is detachably connected to the box. The support platform has one or more support trays for supporting the combustible material, and the support trays are detachably connected to the support platform.

4. The particulate matter gradient concentration generation system as described in claim 3, characterized in that, The first pipe has a horizontally arranged pull-out opening above the air inlet, and the distance between the two ends of the pull-out opening is the diameter of the first pipe; the particulate matter generating device also includes a pull-out plate, which is slidably engaged with the pull-out opening; the top or bottom of the pull-out opening is fixedly provided with an elastic strip for abutting against the pull-out plate; The elastic strip is used to press against the pull-out plate to fix the position of the pull-out plate after it has slid.

5. The particulate matter gradient concentration generation system as described in claim 4, characterized in that, The top of the housing is provided with a support platform, and the support platform is provided with a drive structure for driving the pull-out panel to slide.

6. The particulate matter gradient concentration generation system as described in claim 5, characterized in that, The driving structure includes: A rack is slidably disposed on the support platform, and the rack is fixedly connected to the pull-out plate; The gear meshes with the rack; A drive motor is fixed on the support platform, and the drive shaft of the drive motor is connected to the gear.

7. The particulate matter gradient concentration generation system as described in claim 1, characterized in that, The transition chamber is equipped with a uniform air cone, the tip of which faces the fan end of the transition chamber.

8. The particulate matter gradient concentration generation system as described in claim 1, characterized in that, The particulate matter sampling device also includes a power component connected to one end of the housing; the driving end of the power component is connected to one end of the rotating shaft, and the power component is used to drive the rotating shaft to rotate by a preset angle.

9. The particulate matter gradient concentration generation system as described in claim 1, characterized in that, A branch pipe is connected to the outer peripheral wall of the vent pipe, and the branch pipe is connected to the connecting pipe.

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