Particulate matter concentration detection and calibration device

Abstract

The utility model provides a particulate matter concentration detection and calibration device which comprises a calibration and detection box body, wherein a mixing pipe is arranged on the calibration and detection box body; one end of the mixing pipe is communicated with the calibration detection box body, and the other end of the mixing pipe is respectively connected with a particulate matter generating device and an air inlet guide pipe; an air outlet guide pipe is arranged at one end, far away from the mixing pipe, of the calibration detection box body; a plurality of groups of laser generators and laser receivers are arranged on the side wall of the calibration detection box body; side frames are arranged on the opposite side walls of the calibration detection box body, and a plurality of bearing parts are arranged on the side frames. According to the particulate matter concentration detection and calibration device, clean air and particulate matters are mixed in the mixing pipe through the air inlet guide pipe and the particulate matter generating device, enter the calibration and detection box body and can be continuously discharged from the air outlet guide pipe; a plurality of groups of laser generators and laser receivers on the bearing part are used for accurately and continuously detecting the concentration of the particulate matters, so that the measurement accuracy is ensured, and the measurement error is small; the structure is simple.

Description

Technical Field

[0001] The utility model relates to the technical field of particle concentration detection and calibration, in particular to a particle concentration detection and calibration device. Background Art

[0002] In industrial production, environmental monitoring, and scientific research, the concentration measurement and calibration of solid particulate powders is a key technical challenge. Ensuring accurate concentration measurements is crucial for controlling production quality, complying with environmental standards, and ensuring data accuracy in scientific experiments.

[0003] Currently, although there are various technologies for measuring the concentration of solid particulate matter powders, such as gravimetric and electrochemical methods, these technologies all have limitations, which restrict their scope of application and accuracy. Although gravimetric methods can provide direct concentration readings, they often involve complex sample processing processes, such as drying and weighing, which are time-consuming and easily affected by environmental factors. Electrochemical sensors can work effectively under certain specific conditions, but in environments with high dust concentrations or complex chemical properties, sensor life and stability are major issues. Therefore, the measurement methods mentioned above in the existing technology have shortcomings in terms of operational complexity, equipment cost, maintenance requirements, and measurement accuracy, especially when large-scale concentration measurements and calibrations are required quickly and accurately. In addition, because the measurement methods are time-consuming and require sample processing before further processing, they cannot provide real-time online monitoring and automatic calibration capabilities, which are particularly important in rapidly changing industrial environments.

[0004] Chinese utility model patent publication number CN219328707U discloses an atmospheric particulate matter weighing and detection device. This device pulls the end of a filter membrane through first and second through-holes and extends out of a second housing. A one-way valve is then opened, and exhaust gas is injected into the second housing through a sampling nozzle. Particulate matter in the exhaust gas is automatically trapped on the filter membrane. The filter membrane is then pulled outward, and the removed filter membrane is weighed to calculate the weight of the particulate matter in the exhaust gas. This method of measuring particulate matter concentration cannot detect the concentration of particulate matter in the gas in real time, nor can it obtain real-time changes in particulate matter concentration. It also requires a large number of consumable items, such as filter membranes, resulting in high costs.

[0005] Therefore, it is necessary to develop a new type of solid particle powder concentration detection and calibration device, which can realize real-time calibration and detection of particles, obtain the concentration changes of particles, and improve the accuracy of detection. It has the characteristics of low cost and easy operation. It is of great significance to meet the requirements of modern industry and scientific research needs. Utility Model Content

[0006] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a particle concentration detection and calibration device, which can realize real-time calibration and detection of particulate matter, obtain the concentration change of particulate matter, and improve the accuracy of detection.

[0007] In order to achieve the above-mentioned utility model purpose, the technical solution adopted by the utility model is:

[0008] A particle concentration detection and calibration device comprises a calibration detection box, wherein the calibration detection box is provided with a mixing tube; one end of the mixing tube is connected to the calibration detection box, and the other end of the mixing tube is respectively connected to a particle generating device and an air intake duct for allowing clean air to enter; an end of the calibration detection box away from the mixing tube is provided with an air outlet duct for discharging the measured particulate matter; a plurality of groups of laser generators and laser receivers are movably provided on the side walls of the calibration detection box, and the laser generators and laser receivers are respectively arranged on the outside of the opposite side walls of the calibration detection box; the calibration detection box is provided with side frames on the opposite side walls, and the side frames are provided with a plurality of supporting parts for placing the laser generators and laser receivers.

[0009] The particle concentration detection and calibration device of the present invention is provided with a mixing tube connected to the calibration detection box, and clean air and emitted particulate matter are mixed in the mixing tube through the air inlet duct and the particulate matter generating device and then enter the calibration detection box. Since a plurality of laser generators and laser receivers are provided on the side frames on the side walls of the detection box, the particle concentration in the calibration detection box can be accurately detected and calibrated by placing the laser generators and laser receivers on the outside of the opposite side walls of the calibration detection box respectively, thereby reducing the measurement error. At the same time, since the calibration detection box is provided with an air outlet duct, the particle concentration in the calibration detection box can be detected and calibrated continuously and in real time.

[0010] Preferably, the air outlet duct is provided on a side wall on a different side from the laser generator and the laser receiver.

[0011] Preferably, the mixing tube is arranged on the top of the calibration detection box.

[0012] Furthermore, the side frame includes a first supporting bracket and a second supporting bracket arranged opposite to the first supporting bracket, the first supporting bracket and the second supporting bracket both include a cross bar and a vertical bar, the supporting part is arranged on the cross bar, and the supporting part is detachably connected to the laser generator and the laser receiver; the first supporting bracket and the second supporting bracket are connected by a connecting rod arranged at the bottom of the calibration detection box.

[0013] Furthermore, each of the first supporting bracket and the second supporting bracket includes three horizontal bars and three vertical bars, the horizontal bars and vertical bars on the first supporting bracket and the second supporting bracket are arranged in a field shape, and the supporting parts of the horizontal bars on the first supporting bracket and the second supporting bracket are arranged relatively.

[0014] Preferably, the supporting portions on the upper cross bars of the first supporting bracket and the second supporting bracket are grooves that are detachably fixed to the outer walls of the laser generator and the laser receiver, and the grooves are flush and opposite to each other.

[0015] Furthermore, the above-mentioned particulate matter concentration detection and calibration device is also provided with an air pump that pumps air into the intake duct; the air pump is connected to one end of the intake duct, and the other end of the intake duct is connected to the mixing pipe, and an air filter for filtering particulate matter in the air is provided between the air pump and the intake duct.

[0016] Furthermore, a flow meter for counting the amount of air entering is provided between the air pump and the air intake duct.

[0017] Furthermore, a dryer for drying air is provided between the air pump and the air inlet duct.

[0018] Furthermore, the flow meter is arranged at one end close to the air pump, the dryer is arranged at one side close to the air intake duct; and the air filter is arranged between the flow meter and the dryer.

[0019] Furthermore, a fan is connected to the side wall of the calibration detection box opposite to the air outlet duct.

[0020] Preferably, the fan and the air outlet duct are arranged opposite to each other.

[0021] Preferably, the fan is a brushless fan.

[0022] Furthermore, the side wall of the calibration detection box is a component made of a material that allows laser to pass through.

[0023] Preferably, the material allowing laser light to pass through is glass.

[0024] Furthermore, a fixing hole for accommodating the laser generator or laser receiver is opened in the middle of the side frame, and the fixing hole is arranged at the connection between the vertical rod and the horizontal rod of the first supporting bracket and the second supporting bracket.

[0025] Preferably, valves controlled by controllers are provided on the air inlet duct and the air outlet duct.

[0026] The beneficial effects of the utility model are:

[0027] (1) This particle concentration detection and calibration device can realize real-time calibration and detection of particle matter and obtain the concentration change of particle matter. It has a simple structure and is easy to operate.

[0028] (2) This particle concentration detection and calibration device further measures the particle concentration in the calibration detection box through multiple sets of laser generators or laser receivers installed on the calibration detection box, thereby ensuring the accuracy of the measurement and reducing the measurement error caused by single-position measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the three-dimensional structure of the particle concentration detection and calibration device of the utility model from one perspective.

[0030] Figure 2 This is a schematic diagram of the three-dimensional structure of the particle concentration detection and calibration device of the present invention from another perspective.

[0031] Figure 3 This is a side frame structure diagram of the particle concentration detection and calibration device of the utility model.

[0032] The markings in the figure are as follows: 1 is the calibration detection box; 2 is the mixing tube; 3 is the particle generating device; 4 is the air inlet duct; 5 is the air outlet duct; 6 is the laser generator; 7 is the laser receiver; 8 is the side frame; 9 is the supporting part; 10 is the first supporting bracket; 11 is the second supporting bracket; 12 is the horizontal bar; 13 is the vertical bar, 14 is the connecting rod; 15 is the air pump; 16 is the air filter; 17 is the flow meter; 18 is the dryer; 19 is the fan; 20 is the fixing hole. DETAILED DESCRIPTION

[0033] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only and are schematic, not actual, representations. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components may be omitted, enlarged, or reduced in size, and do not represent the actual dimensions of the product. It is understood that certain well-known structures and their descriptions may be omitted from the drawings. In the drawings of the embodiments of the present invention, identical or similar reference numerals correspond to identical or similar components. In the description of the present invention, it should be understood that terms such as "upper," "lower," "left," and "right" indicate directions, or terms such as "inner" and "outer" indicate positions toward or away from the geometric center of a specific component, respectively. The aforementioned directions and positions are based on the directions or positions shown in the drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, the terms used in the drawings to describe positional relationships are for illustrative purposes only and should not be construed as limiting the scope of this patent. A person of ordinary skill in the art will understand the specific meanings of these terms based on the specific circumstances. The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0034] Example 1

[0035] This embodiment provides a particle concentration detection and calibration device, such as Figure 1-2 As shown, the particle concentration detection and calibration device includes a calibration detection box 1, on which a mixing tube 2 is provided; one end of the mixing tube 2 is connected to the calibration detection box 1, and the other end of the mixing tube 2 is respectively connected to a particle generating device 3 and an air intake duct 4 for allowing clean air to enter; the end of the calibration detection box 1 away from the mixing tube 2 is provided with an air outlet duct 5 for discharging the measured particulate matter; a plurality of groups of laser generators 6 and laser receivers 7 are movably provided on the side wall of the calibration detection box 1, and the laser generators 6 and laser receivers 7 are respectively arranged on the outside of the opposite side walls of the calibration detection box 1; the calibration detection box 1 is provided with side frames 8 on its opposite side walls, and the side frames 8 are provided with a plurality of supporting parts 9 for placing the laser generators 6 and laser receivers 7.

[0036] As an optional solution, the air outlet duct 5 is arranged on a side wall on a different side from the laser generator 6 and the laser receiver 7 .

[0037] As an optional solution, the mixing tube 2 is arranged on the top of the calibration detection box 1. The mixing tube 2 is arranged on the top of the calibration detection box 1 to facilitate the air and particulate matter in the mixing tube 2 to enter the calibration detection box 1.

[0038] As an optional solution, the air inlet duct 4 and the air outlet duct 5 are provided with valves for controlling their opening and closing.

[0039] As an optional solution, a fan 19 is connected to the side wall of the calibration and detection box 1 opposite the air outlet duct 5. Preferably, the fan 19 is located opposite the air outlet duct 5 and is preferably a brushless fan. The fan 19 can mix the air and particulate matter in the calibration and detection box 1 and accelerate the discharge of the air and particulate matter from the calibration and detection box 1 when the valve of the air outlet duct 5 is opened.

[0040] As an optional solution, the side walls of the calibration and detection box 1 are made of a material that allows the laser to pass through; preferably, the material is glass. The side walls of the calibration and detection box 1 are made of a material that allows the laser to pass through, which ensures that the laser generator 6 and laser receiver 7 do not affect the particle measurement by affecting the side walls.

[0041] During the specific implementation process, when it is necessary to measure the concentration of particulate matter, first, clean air enters the mixing tube 2 from the air intake duct 4. At the same time, the particulate matter generating device 3 emits particulate matter to the mixing tube 2. The clean air and particulate matter are mixed in the mixing tube 2, and enter and flow and diffuse in the calibration detection box 1. At this time, the laser generator 6 and the laser receiver 7 are respectively placed on the outside of the opposite side walls of the calibration detection box 1. The laser scattering principle of the existing technology is used to measure the scattering intensity of the laser by the particulate matter in the air to calculate the concentration of the particulate matter. In order to ensure the accuracy of the test, multiple groups of laser generators 6 and laser receivers 7 can be set, and the averaging method can be used through multiple tests to obtain more accurate test data.

[0042] The particle concentration detection and calibration device of the present invention is provided with a mixing tube 2 connected to the calibration detection box 1, and clean air and emitted particulate matter are mixed in the mixing tube 2 and enter the calibration detection box 1 through the air inlet duct 4 and the particulate matter generating device 3. Since a laser generator 6 and a laser receiver 7 are provided on the side frame 8 on the side wall of the calibration detection box 1, the particle concentration in the calibration detection box 1 can be detected and calibrated by placing the laser generator 6 and the laser receiver 7 on the outside of the opposite side walls of the calibration detection box 1 respectively; at the same time, since an air outlet duct 5 is provided on the calibration detection box 1, clean air and particulate matter can be continuously introduced into the interior of the calibration detection box 1, and the signal strength of the laser emitter and laser receiver 7 under different particulate matter concentrations can be continuously collected; therefore, the particle concentration in the calibration detection box 1 can be continuously detected and calibrated in real time.

[0043] This particulate matter concentration detection and calibration device can calibrate and detect particulate matter in real time, obtain the concentration change of particulate matter, and has a simple structure and convenient operation. This particulate matter concentration detection and calibration device further measures the concentration of particulate matter in the calibration and detection box body 1 through multiple groups of laser generators 6 or laser receivers 7 arranged on the calibration and detection box body 1, ensuring the accuracy of the measurement and reducing the measurement error caused by single-position measurement.

[0044] Embodiment 2

[0045] In order to further improve the accuracy of particulate matter concentration measurement, on the basis of Embodiment 1, combined with Figure 3 , as an optional solution, the side frame 8 includes a first supporting bracket 10 and a second supporting bracket 11 arranged opposite to the first supporting bracket 10. Both the first supporting bracket 10 and the second supporting bracket 11 include a cross bar 12 and a vertical bar 13. The supporting portion 9 is arranged on the cross bar 12, and the supporting portion 9 is detachably connected to the laser generator 6 and the laser receiver 7; the first supporting bracket 10 and the second supporting bracket 11 are connected by a connecting rod 14 arranged at the bottom of the calibration and detection box body 1.

[0046] As an optional solution, both the first supporting bracket 10 and the second supporting bracket 11 include three cross bars 12 and three vertical bars 13. The cross bars 12 and vertical bars 13 on the first supporting bracket 10 and the second supporting bracket 11 are distributed in a "field" shape, and the cross bars 12 on the first supporting bracket 10 and the second supporting bracket 11 are arranged with their supporting portions 9 opposite to each other.

[0047] Preferably, the supporting portion 9 on the cross bar 12 of the first supporting bracket 10 and the second supporting bracket 11 is a groove detachably fixed to the outer walls of the laser generator 6 and the laser receiver 7, and the grooves are flush and opposite to each other in pairs.

[0048] As an optional solution, a fixing hole 20 for accommodating the laser generator 6 or the laser receiver 7 is provided in the middle of the side frame 8, and the fixing hole 20 is arranged at the connection of the vertical bar 13 and the cross bar 12 at the middle position of the first supporting bracket 10 and the second supporting bracket 11.

[0049] In the specific implementation process, when the particulate matter concentration is tested, the side frame 8 is placed on the side wall of the calibration detection box 1, wherein the connecting rod 14 is at the bottom of the calibration detection box 1, and the first support bracket 10 and the second support bracket 11 are respectively located on the side walls of the calibration detection box 1; the laser generator 6 and the laser receiver 7 are respectively installed on the supporting parts 9 opposite to the first support bracket 10 and the second support bracket 11. Since the first support bracket 10 and the second support bracket 11 both include three cross bars 12 and three vertical bars 13, the first support bracket 10 and the second support bracket 11 are respectively The horizontal bars 12 and the vertical bars 13 are arranged in a field shape, so the installation positions of the laser generator 6 and the laser receiver 7 are more flexible. For example, you can choose to set the installation positions of the laser generator 6 and the laser receiver 7 on different supporting parts 9 of the horizontal bars 12 and vertical bars 13 respectively, or choose to set the installation positions of the laser generator 6 and the laser receiver 7 at the vertices of the first supporting bracket 10 and the second supporting bracket 11; or choose to set the installation positions of the laser generator 6 and the laser receiver 7 at the vertices of the first supporting bracket 10 and the second supporting bracket 11 at the fixing hole 20; so that the test results are more accurate.

[0050] Preferably, when calibrating the particle concentration, the particle generating device 3 can generate a quantitative amount of particle powder, such as 8 mg, and the calibration detection box 1 is set to a rectangular parallelepiped with a length of 40 cm, a width of 20 cm, and a height of 20 cm, and its volume is 0.016 m 3 , use the fan 19 to mix the particles in the calibration detection box 1, then measure the particle concentration at different installation positions, and obtain the average value of multiple points, which is the laser light intensity corresponding to the particle concentration; then open the valve of the air outlet duct 5, and use the brushless fan to discharge the particles through the air outlet duct 5, and obtain multiple corresponding values ​​of particle concentration and light intensity. Through the multi-point fitting method, the functional relationship between particle concentration and light intensity is obtained, and the concentration calibration of this type of particle is completed. After calibration, for unknown particles, the particle concentration can be measured by repeating the above process.

[0051] Example 3

[0052] In order to further increase the cleanliness of the air mixed with particles and reduce the influence of particles or moisture in the air on the particle concentration test, Figure 1-2 As an optional solution, based on Example 1, an air pump 15 for pumping air into the intake duct 4 is further provided on the particulate matter concentration detection and calibration device; the air pump 15 is connected to one end of the intake duct 4, and the other end of the intake duct 4 is connected to the mixing pipe 2, and an air filter 16 for filtering particulate matter in the air is provided between the air pump 15 and the intake duct 4.

[0053] As an optional solution, a flow meter 17 for counting the amount of air entering is provided between the air pump 15 and the intake duct 4; a dryer 18 for drying the air is provided between the air pump 15 and the intake duct 4; the flow meter 17 is arranged at one end close to the air pump 15, and the dryer 18 is arranged at a side close to the intake duct 4; the air filter 16 is arranged between the flow meter 17 and the dryer 18.

[0054] During the specific implementation process, before the air enters the mixing tube 2 from the air pump 15 through the air intake duct 4, it first passes through the flow meter 17 to count the gas flow, and then passes through the dryer 18 to dry the air and remove moisture; then the air filter 16 is used to filter out the particulate matter in the air to ensure the cleanliness of the air; the clean and dry air enters the mixing tube 2 from the air pump 15 through the air intake duct 4 to prevent the original particulate matter and moisture in the air from having an adverse effect on the test accuracy during the test.

[0055] With respect to the above embodiments, it should be noted that the specific model specifications of the laser generator 6 and the laser receiver 7 in the above embodiments 1-3 need to be selected and determined according to the actual specifications of the device, and the specific selection calculation method adopts the existing technology in this field; the above-mentioned calculation of the particulate matter concentration by the laser data emitted and obtained by the laser generator 6 and the laser receiver 7 is a conventional technology in this field, and the present utility model does not involve improvements to the method for calculating the particulate matter concentration by calculating the above-mentioned laser data; the above-mentioned equipment that requires power supply are all existing technologies, and their principles and connection methods with the power supply are clear and easy to implement for those skilled in the art, so they will not be described in detail here.

[0056] The above description is only a preferred embodiment of the present utility model patent and does not constitute a limitation of the present utility model patent. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model patent shall be included in the scope of protection of the present utility model patent.

Claims

1. A particle concentration detection and calibration device, characterized in that: It includes a calibration and detection box body (1), and a mixing pipe (2) is provided on the calibration and detection box body (1); one end of the mixing pipe (2) is communicated with the calibration and detection box body (1), and the other end of the mixing pipe (2) is respectively connected with a particulate matter generating device (3) and an air inlet duct (4) allowing clean air to enter; at the end of the calibration and detection box body (1) far from the mixing pipe (2), an air outlet duct (5) for discharging the measured particulate matter is provided; on the side wall of the calibration and detection box body (1), multiple groups of laser generators (6) and laser receivers (7) are movably provided, and the laser generators (6) and laser receivers (7) are respectively arranged outside the opposite side walls of the calibration and detection box body (1); on the opposite side walls of the calibration and detection box body (1), side frames (8) are provided, and multiple supporting parts (9) for placing the laser generators (6) and laser receivers (7) are provided on the side frames (8).

2. The particle concentration detection and calibration device according to claim 1, characterized in that: The side frame (8) includes a first supporting frame (10) and a second supporting frame (11) arranged opposite to the first supporting frame (10). Both the first supporting frame (10) and the second supporting frame (11) include cross bars (12) and vertical bars (13). The supporting part (9) is arranged on the cross bar (12), and the supporting part (9) is detachably connected with the laser generator (6) and the laser receiver (7); the first supporting frame (10) and the second supporting frame (11) are connected by a connecting rod (14) arranged at the bottom of the calibration and detection box body (1).

3. The particle concentration detection and calibration device according to claim 2, characterized in that: Both the first supporting frame (10) and the second supporting frame (11) include three cross bars (12) and three vertical bars (13). The cross bars (12) and vertical bars (13) on the first supporting frame (10) and the second supporting frame (11) are distributed in a "field" shape, and the supporting parts (9) on the upper parts of the cross bars (12) on the first supporting frame (10) and the second supporting frame (11) are arranged opposite to each other.

4. The particle concentration detection and calibration device according to claim 1, characterized in that: An air pump (15) for pumping air into the air inlet duct (4) is also provided; the air pump (15) is communicated with one end of the air inlet duct (4), the other end of the air inlet duct (4) is communicated with the mixing pipe (2), and an air filter (16) for filtering particulate matter in the air is provided between the air pump (15) and the air inlet duct (4).

5. The particle concentration detection and calibration device according to claim 4, characterized in that: A flow meter (17) for counting the air intake is provided between the air pump (15) and the air inlet duct (4).

6. The particle concentration detection and calibration device according to claim 5, characterized in that: A dryer (18) for drying air is provided between the air pump (15) and the air inlet duct (4).

7. The particle concentration detection and calibration device according to claim 6, characterized in that: The flow meter (17) is arranged at one end close to the air pump (15), the dryer (18) is arranged on the side close to the air inlet duct (4); the air filter (16) is arranged between the flow meter (17) and the dryer (18).

8. The particle concentration detection and calibration device according to claim 1, characterized in that: A fan (19) is connected to the side wall of the calibration and detection box body (1) opposite to the air outlet duct (5).

9. The particle concentration detection and calibration device according to claim 1, characterized in that: The side wall of the calibration and detection box body (1) is a component composed of a material allowing laser to pass through.

10. The particle concentration detection and calibration device according to claim 3, characterized in that: A fixing hole (20) for accommodating the laser generator (6) or the laser receiver (7) is provided in the middle of the side frame (8), and the fixing hole (20) is provided at the connection between the vertical rod (13) and the horizontal rod (12) of the first supporting bracket (10) and the second supporting bracket (11).

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