Verification device of dust particle counter

Abstract

The utility model relates to a verification device of a dust particle counter. The verification device comprises: an air source generator configured to generate an air flow; the plurality of atomization mechanisms are configured to be selectively communicated with the gas source generator, and each atomization mechanism is suitable for containing and atomizing solutions of standard substances with different particle sizes; each uniform mixing mechanism is communicated with one corresponding atomization mechanism, and the uniform mixing mechanisms are configured to be capable of mixing the air flow and the atomized solution and heating the mixed air flow and the atomized solution so as to form sampling air flow containing a standard substance; and the standard particle counter is connected with the plurality of uniform mixing mechanisms, and is configured to be capable of detecting the concentration of the standard substance in the sampling airflow together with the dust particle counter to be verified so as to verify the dust particle counter based on the difference of the concentrations detected by the standard particle counter and the dust particle counter to be verified. The calibration device can avoid mutual intersection and pollution of standard substances with different particle sizes, and ensures the accuracy of a calibration result.

Description

Technical Field

[0001] The utility model relates to the technical field of testing equipment, and particularly to a calibration device for a dust particle counter. Background Art

[0002] A dust particle counter is an instrument for measuring the number of dust particles and particle size distribution per unit volume. It can monitor and evaluate the particulate matter concentration in indoor air and ambient air in real time, so as to understand the air quality and environmental pollution situation. The dust particle counter has the advantages of high precision, strong function, convenient operation, high degree of automation, etc., and is therefore widely used in many fields such as medicine, electronics, food hygiene, aerospace, etc.

[0003] How to ensure the measurement accuracy of the dust particle counter is crucial. At present, usually a standard particle counter and the dust particle counter to be calibrated are used to detect the sampling air flow containing standard substances at the same time, and the measurement accuracy of the dust particle counter is calibrated based on the measurement differences between the two. For example, Chinese Patent Application CN116870810A discloses a multi-channel fast-switching standard particle generating device. The generating device consists of a fogging module, a high-pressure gas source module, a channel switching module, a drying and dilution module, a control module, etc. Among them, the fogging module can generate standard particle aerosols in multiple independent channels respectively; the high-pressure gas source module can generate compressed gas and transport it into each independent channel; the channel switching module is located between the high-pressure gas source module and the fogging module, and changes the flow path of the compressed air to promote the switching and transportation of the compressed gas between multiple independent channels; the drying and dilution module can dry and dilute the standard particle aerosol generated by the fogging module in any independent channel to form a standard particle aerosol suitable for final output for the subsequent calibration of the dust particle counter. By setting different particle size generating channels and the built-in high-pressure gas source generating module, this generating device can avoid the uncertainty in the aerosol generation process. However, since multiple generating channels in this generating device share a drying and dilution module, standard substances of different particle sizes will inevitably remain and mix in the drying and dilution module, resulting in cross-contamination of the standard substances and reducing the accuracy of the calibration results.

[0004] Therefore, a new technical solution is needed in this field to solve the above problems. Summary of the Utility Model

[0005] To solve or to a certain extent improve the technical problem in the prior art that the calibration device of a dust particle counter is prone to cross - contamination of standard substances with different particle sizes, the present utility model provides a calibration device for a dust particle counter. The calibration device includes: a gas source generator configured to generate an air flow; a plurality of atomization mechanisms configured to selectively communicate with the gas source generator, and each atomization mechanism being adapted to accommodate and atomize a solution of standard substances with different particle sizes; a plurality of mixing mechanisms, each mixing mechanism communicating with a corresponding atomization mechanism and configured to mix and heat the air flow and the atomized solution to form a sampling air flow containing the standard substances; and a standard particle counter connected to the plurality of mixing mechanisms and configured to detect the concentration of the standard substances in the sampling air flow together with the dust particle counter to be calibrated, so as to calibrate the dust particle counter based on the difference in the concentrations detected by the two.

[0006] Those skilled in the art can understand that the calibration device of the dust particle counter of the present utility model includes a gas source generator, a plurality of atomization mechanisms, a plurality of mixing mechanisms and a standard particle counter. Among them, the gas source generator is used to generate an air flow. The plurality of atomization mechanisms can selectively communicate with the gas source generator, and each atomization mechanism can accommodate a solution of standard substances with different particle sizes and atomize the corresponding solution. Therefore, by selecting the atomization mechanism with the appropriate particle size of the standard substance and controlling the connection timing between the atomization mechanism and the gas source generator, it is possible to conveniently generate an air flow containing standard substances with different particle sizes. Since the solutions of standard substances with different particle sizes are separately filled in different atomization mechanisms, cross - contamination of the standard substances during atomization is avoided. In addition, each mixing mechanism communicates with a corresponding atomization mechanism, and the air flow mixed with the atomized solution is mixed and heated in an independent mixing mechanism to form a sampling air flow containing the standard substances. During this process, since the air flow and the atomized solution are also mixed and heated in an independent mixing mechanism, the sampling air flows containing standard substances with different particle sizes do not cross - contaminate each other, thereby improving the purity of the sampling air flow and ensuring the accuracy of the calibration result. In addition, the standard particle counter is connected to the plurality of mixing mechanisms, and the standard particle counter can detect the concentration of the standard substances in the sampling air flow simultaneously with the dust particle counter to be calibrated, so as to calibrate the dust particle counter based on the difference in the concentrations detected by the two and determine whether the measurement accuracy of the dust particle counter meets the actual requirements.

[0007] In the preferred technical solution of the above-mentioned calibration device for a dust particle counter, the calibration device further includes: a sampling fan, which is arranged between the plurality of mixing mechanisms and the standard particle counter. The setting of the sampling fan can make the sampling air flow have an appropriate flow rate to meet the needs of rapid testing.

[0008] In the preferred technical solution of the above-mentioned calibration device for a dust particle counter, the wind speed of the sampling fan is adjustable so as to flexibly control the flow rate of the sampling air flow by adjusting the wind speed.

[0009] In the preferred technical solution of the above-mentioned calibration device for a dust particle counter, the flow rate of the sampling air flow is 2.83 L / min, 28.3 L / min, 50 L / min or 100 L / min to meet the parameter design of different test standards.

[0010] In the preferred technical solution of the above-mentioned calibration device for a dust particle counter, the calibration device further includes a flow meter for testing the flow rate of the sampling air flow, and the flow meter is arranged between the sampling fan and the standard particle counter. The setting of the flow meter can accurately monitor the flow rate of the sampling air flow and ensure the calibration accuracy.

[0011] In the preferred technical solution of the above-mentioned calibration device for a dust particle counter, the calibration device further includes a filter arranged between the gas source generator and the plurality of atomizing mechanisms. The setting of the filter can filter impurities in the air flow and prevent the impurities from contaminating and interfering with the particle size and quantity of the standard substance.

[0012] In the preferred technical solution of the above-mentioned calibration device for a dust particle counter, the calibration device further includes: a switching valve, which has an inlet connected to the gas source generator and outlets respectively connected to the plurality of atomizing mechanisms corresponding thereto, and the switching valve is configured to selectively open the outlets so as to connect the gas source generator and the corresponding atomizing mechanisms. The setting of the switching valve can realize the on-off control of a single component for multiple atomizing mechanisms and the gas source generator at the same time, thereby simplifying the number of control components and reducing the control cost.

[0013] In the preferred technical solution of the above-mentioned calibration device for a dust particle counter, the calibration device further includes: a plurality of electromagnetic valves, each electromagnetic valve has an inlet end connected to the gas source generator and an outlet end connected to a corresponding atomizing mechanism, and the plurality of electromagnetic valves are configured such that when any one of the plurality of electromagnetic valves is in an open state, the remaining electromagnetic valves are in a closed state. The setting of the plurality of electromagnetic valves can avoid the frequent use of a single control key (such as a switching valve) and reduce its service life, and improve the reliability of the entire calibration device.

[0014] In the preferred technical solution of the calibration device of the above dust particle counter, the number of the plurality of atomization mechanisms and the plurality of mixing mechanisms is 4 each, so as to meet the design requirements of conventional calibration.

[0015] In the preferred technical solution of the calibration device of the above dust particle counter, a heater is provided in each of the mixing mechanisms to flexibly heat the air flow and the atomized solution. Brief Description of the Drawings

[0016] The preferred embodiments of the present invention will be described below with reference to the drawings, in which:

[0017] Figure 1 is a schematic structural diagram of the first embodiment of the calibration device of the dust particle counter of the present invention;

[0018] Figure 2 is a schematic structural diagram of the second embodiment of the calibration device of the dust particle counter of the present invention.

[0019] List of Reference Numerals:

[0020] 100, calibration device; 110, gas source generator; 120, filter; 130, switching valve; 131, inlet; 132, outlet; 140, solenoid valve; 141, first solenoid valve; 142, second solenoid valve; 143, third solenoid valve; 144, fourth solenoid valve; 150, atomization mechanism; 151, first atomization mechanism; 152, second atomization mechanism; 153, third atomization mechanism; 154, fourth atomization mechanism; 160, mixing mechanism; 161, first mixing mechanism; 162, second mixing mechanism; 163, third mixing mechanism; 164, fourth mixing mechanism; 170, sampling fan; 180, flowmeter; 190, standard particle counter; 200, dust particle counter. Detailed Embodiments

[0021] The preferred embodiments of the present invention will be described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0022] It should be noted that in the description of the present invention, the terms indicating the direction or position relationship such as "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. are based on the direction or position relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0023] In addition, it should be noted that in the description of the present utility model, unless otherwise clearly specified and defined, the terms "installation", "setting", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and can also be the communication inside two components. For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] To solve or to some extent improve the technical problem in the prior art that the calibration device of a dust particle counter is prone to cross-contamination of standard substances with different particle sizes, the present utility model provides a calibration device 100 for a dust particle counter 200. The calibration device 100 includes: an air source generator 110 configured to generate an air flow; a plurality of atomizing mechanisms 150 configured to selectively communicate with the air source generator 110, and each atomizing mechanism 150 is adapted to accommodate and atomize a solution of standard substances with different particle sizes; a plurality of mixing mechanisms 160, each mixing mechanism 160 communicating with a corresponding atomizing mechanism 150 and configured to mix and heat the air flow and the atomized solution to form a sampling air flow containing standard substances; and a standard particle counter 190 connected to the plurality of mixing mechanisms 160 and configured to detect the concentration of standard substances in the sampling air flow together with the dust particle counter 200 to be calibrated, so as to calibrate the dust particle counter 200 based on the difference in the concentrations detected by the two.

[0025] Figure 1 It is a schematic structural diagram of the first embodiment of the calibration device of the dust particle counter of the present utility model. As Figure 1 shown, in one or more embodiments, the calibration device 100 for the dust particle counter 200 of the present utility model includes components such as an air source generator 110, a plurality of independent atomizing mechanisms 150, a mixing mechanism 160 corresponding to each atomizing mechanism 150, and a standard particle counter 190. The components can be connected through appropriate pipelines (not marked in the figure) to be connected to the dust particle counter 200 to be tested, so as to calibrate the dust particle counter 200.

[0026] As Figure 1 shown, in one or more embodiments, the air source generator 110 is an air compressor to generate a high-pressure air flow after compressing the inhaled air. Alternatively, the air source generator 110 can also be set in other suitable forms such as a diaphragm pump or a piston pump, as long as it can generate a stable air flow.

[0027] As Figure 1As shown, in one or more embodiments, the calibration device 100 further includes a filter 120 located between the gas source generator 110 and the plurality of atomization mechanisms 150. Specifically, the filter 120 is arranged on the pipeline between the gas source generator 110 and the plurality of atomization mechanisms 150 to effectively filter impurities (especially solid particles) in the air flow generated by the gas source generator 110, preventing the impurities from entering components such as the subsequent atomization mechanism 150, mixing mechanism 160, and standard particle counter 190, and avoiding contamination and interference with the particle size and quantity of the reference material, thereby ensuring the accuracy and reliability of the calibration result. The filter 120 can be, but is not limited to, a HEPA filter 120 (i.e., High Efficiency Particulate Air Filter), a ULPA filter 120 (i.e., Ultra-Low Penetration Air Filter), etc. Additionally, the number and arrangement position of the filter 120 can also be adjusted according to actual needs. For example, a corresponding filter 120 is provided on the pipeline near each atomization mechanism 150, etc.

[0028] As Figure 1 shown, in one or more embodiments, the calibration device 100 further includes a switching valve 130 to control the on / off of the gas source generator 110 and the plurality of atomization mechanisms 150 using one control member simultaneously. Specifically, the switching valve 130 is arranged on the pipeline between the filter 120 and the plurality of atomization mechanisms 150. The switching valve 130 has an inlet 131 connected to the gas source generator 110 and outlets 132 respectively corresponding to and connected to the plurality of atomization mechanisms 150. By controlling the different positions of the internal valve body (not shown in the figure) in the switching valve 130, the on / off between the inlet 131 and any one of the outlets 132 can be adjusted, enabling the air flow to alternatively flow out from one of the plurality of outlets 132, thereby connecting the gas source generator 110 and the corresponding atomization mechanism 150. The type of the switching valve 130 is not limited, such as a globe-type switching valve 130, a butterfly-type switching valve 130, a cock-type switching valve 130, etc.

[0029] As Figure 1 shown, in one or more embodiments, the plurality of atomization mechanisms 150 are 4 independent atomization mechanisms 150, namely the first atomization mechanism 151, the second atomization mechanism 152, the third atomization mechanism 1531, and the fourth atomization mechanism 154. The setting of the 4 atomization mechanisms 150 can meet the design requirements of conventional calibration. Alternatively, the atomization mechanism 150 can also be set to other suitable quantities more or less than 4, such as 3, 5, etc.

[0030] Continue to refer to Figure 1, each atomizing mechanism 150 is configured to accommodate solutions of standard substances with different particle sizes and atomize the corresponding solutions. The standard substances can be, but are not limited to, styrene and divinylbenzene. The solutions can be prepared by emulsion polymerization to obtain a monodisperse cross-linked polystyrene standard particle suspension. The particle size of the standard substances can be adjusted according to actual needs, such as 0.15μm, 0.3μm, 0.45μm, 0.75μm, etc., and can also be adjusted according to appropriate test standards (such as JJF1190-2008 "Calibration Specification for On-line Dust Particle Counter 200", etc.). It should be noted that the specific structure of the atomizing mechanism 150 is not limited as long as it can smoothly atomize the solution containing the standard substance.

[0031] As Figure 1 shown, in one or more embodiments, the plurality of mixing mechanisms 160 are 4 independent mixing mechanisms 160, namely the first mixing mechanism 161, the second mixing mechanism 162, the third mixing mechanism 163 and the fourth mixing mechanism 164. Each mixing mechanism 160 is connected to a corresponding atomizing mechanism 150. Specifically, the first mixing mechanism 161 is connected to the first atomizing mechanism 151; the second mixing mechanism 162 is connected to the second atomizing mechanism 152; the third mixing mechanism 163 is connected to the third atomizing mechanism 153; the fourth mixing mechanism 164 is connected to the fourth atomizing mechanism 154. Alternatively, the mixing mechanism 160 can also be set to other suitable numbers more or less than 4, such as 3, 5, etc., as long as it can be correspondingly matched with the atomizing mechanism 150.

[0032] Continue to refer to Figure 1 , each mixing mechanism 160 is configured to mix and heat the air flow and the atomized solution to form a sampling air flow containing the standard substance. Taking the first atomizing mechanism 151 and the first mixing mechanism 161 as an example, when the switching valve 130 connects the gas source generator 110 and the first atomizing mechanism 151, the air flow generated by the gas source generator 110 will flow along the pipeline to the first atomizing mechanism 151. The first atomizing mechanism 151 atomizes the solution containing the standard substance, and the air flow will carry the atomized solution to the first mixing mechanism 161 without cross-interference with other mixing mechanisms 160, ensuring the purity of the sampling air flow. In one or more embodiments, a heater (not shown in the figure) is provided in each mixing mechanism 160, which can conveniently heat the internal air of the mixing mechanism 160 to form a sampling air flow that meets the measurement requirements, and can also flexibly control the opening and closing and heating amount of each heater to achieve fine control. The type of the heater is not limited, for example, it can be an electric heater, etc.

[0033] As Figure 1As shown, in one or more embodiments, the calibration device 100 of the present utility model further includes a sampling fan 170. The sampling fan 170 is arranged between a plurality of mixing mechanisms 160 and a standard particle counter 190 to direct the sampling air flow in the mixing mechanism 160 to the standard particle counter 190. In one or more embodiments, the wind speed of the sampling fan 170 is adjustable to conveniently adjust the flow rate of the sampling air flow. The flow rate of the sampling air flow can be adjusted according to actual needs, such as 2.83 L / min, 28.3 L / min, 50 L / min, or 100 L / min, etc.

[0034] As Figure 1 shown, in one or more embodiments, the calibration device 100 of the present utility model further includes a flow meter 180 to test the specific flow rate of the sampling air flow. The flow meter 180 is arranged between the sampling fan 170 and the standard particle counter 190, and can also be arranged at other suitable positions.

[0035] As Figure 1 shown, in one or more embodiments, the standard particle counter 190 is respectively connected to a plurality of mixing mechanisms 160. The standard particle counter 190 can be, but is not limited to, a light scattering detection particle counter. The standard particle counter 190 should meet the test requirements for different particle sizes and different flow rates, and the particle counting efficiency should be calibrated by a national legal metrological verification institution to ensure the accuracy and reliability of the calibration.

[0036] In one or more embodiments, the calibration device 100 of the present utility model further includes a controller (not shown in the figure). The controller is configured to form a communication connection with the gas source generator 110, the switching valve 130, the atomization mechanism 150, the heater in the mixing mechanism 160, the sampling fan 170, the flow meter 180, and the standard particle counter 190, so as to automatically control the opening and closing of each component and obtain the corresponding detection data, improving the automation degree of the calibration.

[0037] Figure 2 is a schematic structural diagram of the second embodiment of the calibration device of the dust particle counter of the present utility model. As Figure 2As shown, in one or more embodiments, the calibration device 100 of the present utility model includes a gas source generator 110, a filter 120, four solenoid valves 140, four independent atomization mechanisms 150, a mixing mechanism 160 corresponding to each atomization mechanism 150, a sampling fan 170, a flow meter 180, a standard particle counter 190, and other components. Among them, the four solenoid valves 140 are respectively a first solenoid valve 141, a second solenoid valve 142, a third solenoid valve 143, and a fourth solenoid valve 144. Alternatively, the number of solenoid valves 140 can also be set to other suitable numbers more or less than four, such as three, five, etc., as long as it can correspond and match with the atomization mechanism 150. Each solenoid valve 140 has an inlet end (not marked in the figure) connected to the gas source generator 110 and an outlet end (not marked in the figure) connected to a corresponding atomization mechanism 150. These solenoid valves 140 are configured such that when any one of the solenoid valves 140 is in the open state, the remaining solenoid valves 140 are all in the closed state. For example, when the second solenoid valve 142 is in the open state, the first solenoid valve 141, the third solenoid valve 143, and the fourth solenoid valve 144 are all in the closed state. Through the above settings, it is possible to avoid the frequent use of a single control component (such as the switching valve 130) and reduce its service life, thereby improving the reliability of the entire calibration device 100.

[0038] It should be noted that the parts not mentioned in the second embodiment can be configured the same as those in the first embodiment and will not be elaborated here.

[0039] As Figure 1 and Figure 2 As shown, when the calibration device 100 of the present utility model is in use, the dust particle counter 200 to be calibrated can be connected to the standard particle counter 190. Then, select the atomization mechanism 150 with a standard substance of a suitable particle size according to the test requirements, and connect the gas source generator 110 and the atomization mechanism 150 through the switching valve 130 or the solenoid valve 140. Then, control the components such as the gas source generator 110, the selected atomization mechanism 150, the heater in the mixing mechanism 160 connected to the atomization mechanism 150, and the sampling fan 170 to be turned on in a timely manner to form a sampling air flow with a predetermined flow rate. When these sampling air flows sequentially pass through the standard particle counter 190 and the dust particle counter 200, the standard particle counter 190 and the dust particle counter 200 can detect the concentration of the standard substance in the sampling air flow. Finally, taking the concentration measured by the standard particle counter 190 as a reference, the dust particle counter 200 is calibrated based on the difference between the two detected concentrations.

[0040] So far, the technical solution of the present utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easily understood by those skilled in the art that the protection scope of the present utility model is obviously not limited to these specific embodiments. Without departing from the principle of the present utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of the present utility model.

Claims

1. A dust particle counter calibration device, characterized in that: The verification device comprises: an air source generator, the air source generator being configured to generate an air flow; A plurality of atomizing mechanisms, the plurality of atomizing mechanisms being configured to be selectively connected to the gas source generator, and each of the atomizing mechanisms being suitable for containing and atomizing solutions of standard substances having different particle sizes; A plurality of mixing mechanisms, each of which is connected to a corresponding atomizing mechanism and is configured to mix and heat the air flow and the atomized solution to form a sampling air flow containing the standard substance; and A standard particle counter is connected to the multiple mixing mechanisms and is configured to detect the concentration of the standard substance in the sampled airflow together with the dust particle counter to be calibrated, so as to calibrate the dust particle counter based on the difference in the concentrations detected by the two.

2. The dust particle counter calibration device according to claim 1, characterized in that: The verification device also includes: A sampling fan is arranged between the multiple mixing mechanisms and the standard particle counter.

3. The dust particle counter calibration device according to claim 2, characterized in that: The wind speed of the sampling fan is adjustable.

4. The dust particle counter calibration device according to claim 3, characterized in that: The flow rate of the sampling airflow is 2.83 L / min, 28.3 L / min, 50 L / min or 100 L / min.

5. The dust particle counter calibration device according to any one of claims 2 to 4, characterized in that: The calibration device further comprises a flow meter for testing the flow rate of the sampled air flow, wherein the flow meter is arranged between the sampling fan and the standard particle counter.

6. The dust particle counter calibration device according to claim 1, characterized in that: The verification device also includes a filter arranged between the gas source generator and the plurality of atomization mechanisms.

7. The dust particle counter calibration device according to claim 1, characterized in that: The verification device also includes: A switching valve, wherein the switching valve has an inlet connected to the gas source generator and outlets respectively connected to the multiple atomizing mechanisms, and the switching valve is configured to selectively open the outlets so as to connect the gas source generator and the corresponding atomizing mechanism.

8. The dust particle counter calibration device according to claim 1, characterized in that: The verification device also includes: A plurality of solenoid valves, each of which has an inlet end connected to the gas source generator and an outlet end connected to a corresponding atomization mechanism, and the plurality of solenoid valves are configured so that when any one of the plurality of solenoid valves is in an open state, the remaining solenoid valves are in a closed state.

9. The dust particle counter calibration device according to claim 1, characterized in that: The number of the multiple atomization mechanisms and the number of the multiple mixing mechanisms are both 4.

10. The dust particle counter calibration device according to claim 1, characterized in that: A heater is provided in each of the mixing mechanisms.

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