Respiratory dust concentration measuring method and sensor equipment

Abstract

The invention relates to the technical field of dust concentration detection, in particular to a respirable dust concentration measuring method and sensor device.The respirable dust concentration measuring method comprises the steps that a draught fan of the respirable dust concentration measuring sensor device is started, and dust-containing air enters a separation module of the respirable dust concentration measuring sensor device; when the separated airflow containing the respirable dust stably passes through the concentration detection module of the respirable dust concentration measurement sensor equipment, the fan is closed, then the concentration detection module is started, and the respirable dust concentration at the concentration detection module at the moment is measured; the respirable dust concentration measured by the concentration detection module within a short time when the fan is shut down can be regarded as the respirable dust concentration measured when airflow passes through the concentration detection module when the fan continuously operates, so that the fan and the concentration detection module are sequentially and respectively operated, the electrical load can be reduced, the equipment load demand is reduced, and the power consumption is reduced. And the method is suitable for long-distance on-load use scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of dust concentration detection, and in particular to a method for measuring respirable dust concentration and a sensor device. Background Art

[0002] The dust generated during the coal mine production process is very harmful, especially the respirable dust in the dust-containing gas, which will seriously affect the health of workers. In order to grasp and control the dust concentration in real time, the respirable dust concentration measurement sensor is currently used to measure the respirable dust concentration in real time. The detection principle is to first use a separation device to separate the respirable dust from the total dust, and then transmit the separated airflow containing respirable dust to the dust concentration detection module for concentration measurement. The dust concentration detection principle can be based on light scattering method, beta ray method, charge induction method, oscillating balance method and other principles.

[0003] A Chinese invention patent application with application publication number CN112014286A discloses a respirable dust concentration measurement sensor, which includes a sensor body, a waterproof cover and a negative pressure fan. A separation chamber, a coarse particle channel and a respirable dust channel are arranged in the sensor body. A concentration detection module is arranged on the respirable dust channel. An air inlet is arranged on one side of the waterproof cover on the sensor body, and the air inlet is connected to the separation chamber. An air guide cone is arranged on one side of the waterproof cover close to the air inlet, and the air guide cone faces the air inlet. The air guide cone is configured to guide the dust-laden airflow into the air inlet, and the air guide cone and the air inlet work together to disperse the dust-laden airflow in a cone shape after passing through the air inlet. After the dust-laden airflow is dispersed in a cone shape, coarse particles have heavy mass, large inertia, and a narrow dispersion range, and enter the coarse particle inlet, while respirable dust has light mass, small inertia, and a wide dispersion range, and enters the respirable dust inlet, thereby realizing the separation of coarse particles and respirable dust; the central axes of the air inlet, the concentration detection module and the negative pressure fan are arranged in a colinear manner, and the respirable dust channel and the coarse particle channel are connected together by a confluence pipe, and share a fan. The sensor body of the above-mentioned respirable dust concentration measurement sensor is an outer shell, and the air guide cone, the air inlet and the separation chamber together form a separation module for separating the respirable dust. The respirable dust channel is provided with a dust concentration detection module and allows the airflow containing respirable dust to pass through to measure the concentration of the respirable dust. The respirable dust channel provided with the dust concentration detection module constitutes a dust measuring passage, and the coarse particle channel is used to discharge coarse particle dust that is not respirable dust, and the coarse particle channel constitutes a dust exhaust passage.

[0004] When measuring the concentration of respirable dust, the fan and the concentration detection module are both kept turned on, the dusty air enters the separation module for separation, and the separated respirable dust enters the dust measurement passage. Under the negative pressure of the fan, the respirable dust continues to pass through the concentration detection module on the dust measurement passage. When the fan is working, the concentration detection module measures the concentration of respirable dust. When the underground respirable dust concentration measurement sensor equipment is operating normally, the equipment is powered by the intrinsically safe circuit. The intrinsically safe circuit uses a 24V voltage. The power supply equipment supplies power to the sensor through the transmission cable. The cable itself will also lose some power during power transmission. In order to meet the higher power load of the fan and concentration detection module of the respirable dust concentration sensor equipment during measurement and ensure the load demand, the sensor equipment is currently closer to the power supply equipment, so that the distance between the power supply equipment and the sensor equipment is shorter. Accordingly, the cable laying length is shorter to avoid excessive power loss of the cable itself and affect the power load demand of the sensor equipment during measurement. However, this cannot adapt to the long-distance load scenario. The cable laying length is limited, which causes inconvenience to the use of the sensor equipment. Summary of the invention

[0005] The object of the present invention is to provide a method for measuring the concentration of respirable dust so as to solve the problem that the current method for measuring the concentration of respirable dust requires a high power load of the respirable dust concentration sensor equipment, which is not conducive to realizing long-distance load-carrying usage scenarios; the object of the present invention is also to provide a respirable dust concentration measurement sensor equipment to solve the above-mentioned problem.

[0006] The technical solution of the method for measuring the concentration of respirable dust of the present invention is:

[0007] A method for measuring respirable dust concentration is provided. The method comprises the following steps: turning on a fan of a respirable dust concentration measurement sensor device to allow dust-laden air to enter a separation module of the respirable dust concentration measurement sensor device. When the separated airflow containing respirable dust stably passes through a concentration detection module of the respirable dust concentration measurement sensor device, the fan is turned off, and then the concentration detection module is turned on to measure the respirable dust concentration at the concentration detection module to obtain a respirable dust concentration measurement result.

[0008] Furthermore, when the concentration detection module is turned on for measurement, the respirable dust concentration is measured once every certain period of time, and the respirable dust concentration is measured multiple times and an average value is taken as the measurement result.

[0009] Furthermore, the interval between two adjacent measurements is 0.5-1.5 seconds.

[0010] Further, the fan is turned on for a set time and then turned off.

[0011] Furthermore, after obtaining a measurement result of the respirable dust concentration, the concentration detection module is turned off, the fan is turned on, and periodic cycle measurement is performed.

[0012] Beneficial effects of the respirable dust concentration measurement method of the present invention: the present invention makes element changes on the basis of the respirable dust concentration measurement method in the prior art, so that the fan and the concentration detection module of the respirable dust concentration measurement sensor equipment work in time sharing, and the respirable dust concentration is obtained by measuring the instantaneous airflow after the fan is turned off; during measurement, the fan is first turned on, and the dust-containing gas enters the separation module for separation under the action of the fan, and when the separated airflow containing respirable dust stably passes through the concentration detection module, the fan is turned off and the concentration detection module is immediately turned on, because the airflow will not stop flowing immediately within a short time after the fan is turned off, and the airflow will continue to flow through the concentration detection module under the action of inertia, thus At this time, the respirable dust concentration measured by the concentration detection module within a short period of time when the fan is turned off can be regarded as the respirable dust concentration measured when the airflow passes through the concentration detection module when the fan continues to run, and can be used as an accurate and effective respirable dust concentration measurement result; this respirable dust concentration measurement method can ensure the accuracy and effectiveness of the respirable dust concentration measurement result, by making the fan and the concentration detection module work separately in sequence, which can reduce the power load at the same time during the measurement process, reduce the load demand of the respirable dust concentration measurement sensor equipment, and thus allow the transmission cable that powers the equipment to occupy more electrical energy, and the cable length can be set longer, which is conducive to adapting to long-distance load usage scenarios.

[0013] The technical solution of the respirable dust concentration measurement sensor device of the present invention is:

[0014] A respirable dust concentration measurement sensor device includes a controller for implementing a respirable dust concentration measurement method when executing a program. The respirable dust concentration measurement method includes turning on a fan of the respirable dust concentration measurement sensor device to allow dust-laden air to enter a separation module of the respirable dust concentration measurement sensor device, turning off the fan when an airflow containing respirable dust to be separated stably passes through a concentration detection module of the respirable dust concentration measurement sensor device, and then turning on the concentration detection module to measure the respirable dust concentration at the concentration detection module to obtain a respirable dust concentration measurement result.

[0015] Furthermore, when the concentration detection module is turned on for measurement, the measurement is performed at regular intervals, the respirable dust concentration is measured multiple times and the average value is taken as the measurement result.

[0016] Furthermore, the interval between two adjacent measurements is 0.5-1.5 seconds.

[0017] Further, the fan is turned on for a set time and then turned off.

[0018] Furthermore, after obtaining a measurement result of the respirable dust concentration, the concentration detection module is turned off, the fan is turned on, and periodic cycle measurement is performed.

[0019] Furthermore, the respirable dust concentration measurement sensor device includes a dust measuring passage and a dust exhaust passage, one end of the dust measuring passage is connected to the separation module, and the other end is connected to the dust measuring fan, and one end of the dust exhaust passage is connected to the separation module, and the other end is connected to the dust exhaust fan; the dust measuring fan is a fan that needs to be turned on when measuring the respirable dust concentration.

[0020] Furthermore, the dust measuring passage and the dust exhaust passage are respectively provided with switch valves.

[0021] Furthermore, a dust storage chamber is provided on the dust exhaust passage downstream of the separation module.

[0022] Furthermore, the dust measuring passage is also connected to a calibration passage, and the calibration passage is provided with a calibration interface for connecting to a calibration device.

[0023] Beneficial effects of the respirable dust concentration measuring sensor device of the present invention: the present invention makes element changes on the basis of the respirable dust concentration measuring sensor device in the prior art, so that the fan and the concentration detection module of the respirable dust concentration measuring sensor device work in time sharing, and obtains the respirable dust concentration by measuring the instantaneous airflow after the fan is turned off; during measurement, the fan is turned on first, and the dust-containing gas enters the separation module for separation under the action of the fan, and when the separated airflow containing respirable dust stably passes through the concentration detection module, the fan is turned off and the concentration detection module is immediately turned on, because the airflow will not stop flowing immediately within a short time after the fan is turned off, and the airflow will continue to flow through the concentration detection module under the action of inertia. Therefore, the respirable dust concentration measured by the concentration detection module in a short time when the fan is turned off can be regarded as the respirable dust concentration measured when the airflow passes through the concentration detection module when the fan is continuously running, and can be used as an accurate and effective respirable dust concentration measurement result; this respirable dust concentration measurement method can reduce the power load at the same time during the measurement process by making the fan and the concentration detection module work separately while ensuring the accuracy and effectiveness of the respirable dust concentration measurement result, thereby reducing the load demand of the respirable dust concentration measurement sensor equipment, and thus allowing the power transmission cable that powers the equipment to occupy more power, and the cable length can be set longer, which is conducive to adapting to long-distance load usage scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic structural diagram of an embodiment of a respirable dust concentration measurement sensor device of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the airflow path principle of the respirable dust concentration measurement sensor device.

[0026] In the figure: 1. outer shell; 2. cyclone separator; 3. corner joint; 4. adapter main section; 5. upstream section of dust measuring path; 6. dust concentration detection module; 7. three-way joint; 8. electric valve of dust measuring path; 9. downstream section of dust measuring path; 10. dust measuring fan; 11. dust storage box; 12. electric valve of dust exhaust path; 13. main section of dust exhaust path; 14. dust exhaust fan; 15. main section of calibration path; 16. calibration interface. DETAILED DESCRIPTION

[0027] When measuring the respirable dust concentration, the present invention first turns on the fan to allow the airflow containing the respirable dust to pass through the concentration detection module stably, then turns off the fan and immediately turns on the concentration detection module. Since the airflow does not stop flowing immediately within a short period of time after the fan is turned off, the airflow will continue to flow through the concentration detection module under the action of inertia. Therefore, the respirable dust concentration measured by the concentration detection module within a short period of time after the fan is turned off can be regarded as the respirable dust concentration measured when the airflow passes through the concentration detection module when the fan is continuously running, and can be used as an accurate and effective respirable dust concentration measurement result; by making the fan and the concentration detection module work in time-sharing, the power load at the same time during the measurement process can be reduced, and the load demand of the respirable dust concentration measurement sensor equipment is reduced, thereby allowing the power transmission cable that supplies power to the equipment to occupy more power, and the cable length can be set to be longer, which is conducive to adapting to long-distance load usage scenarios.

[0028] Embodiment of the method for measuring the concentration of respirable dust of the present invention:

[0029] The method for measuring respirable dust concentration includes the following steps:

[0030] Turn on the fan of the respirable dust concentration measurement sensor device. Under the action of the fan, the dust-laden air enters the separation module of the respirable dust concentration measurement sensor device, and the respirable dust and coarse dust particles in the dust-laden gas are separated, wherein the separated airflow containing the respirable dust flows through the concentration detection module of the respirable dust concentration measurement sensor device. Keep the fan working for 30 seconds, so that the separated airflow containing the respirable dust stably passes through the concentration detection module of the respirable dust concentration measurement sensor device. 30 seconds is the set time to ensure that the airflow reaches a stable state. After the fan has worked for 30 seconds, turn off the fan again, and immediately turn on the concentration detection module to measure the respirable dust concentration at the concentration detection module at this time. The respirable dust concentration is measured once every second, and the respirable dust concentration is measured three times and an average value is taken, and the average value is taken as the respirable dust concentration measurement result. After obtaining a respirable dust concentration measurement result, the concentration detection module is turned off and the fan is turned on to perform periodic cycle measurement, so as to grasp the respirable dust concentration information in real time.

[0031] The reliability of the measurement results can be guaranteed by taking the average value of multiple measurements. The measurement is performed every 1 second to ensure that the measurement results are reliable in a short period of time and to facilitate the adaptation to the frequency of the concentration detection module. Turning on the fan for 30 seconds is conducive to ensuring the stability of the airflow, thereby ensuring the accuracy of the measurement results. The fan and the concentration detection module of the respirable dust concentration measurement sensor device work in time-sharing mode, and the respirable dust concentration is obtained by measuring the instantaneous airflow after the fan is turned off. While ensuring that the respirable dust concentration measurement results are accurate and effective, the power load at the same time during the measurement process can be reduced by making the fan and the concentration detection module work separately, reducing the load requirements of the respirable dust concentration measurement sensor device, facilitating the use of longer cables, and facilitating the adaptation to long-distance load-carrying scenarios. Under the requirements of the intrinsically safe circuit product design specifications, compared with the existing measurement method that can only achieve about one kilometer of load-carrying, the respirable dust concentration measurement method can achieve six kilometers of load-carrying.

[0032] In other implementations, when data accuracy can be guaranteed, each cycle period may be measured only once.

[0033] In other implementations, the interval between two adjacent measurements may also be 0.5 seconds or 1.5 seconds.

[0034] In other embodiments, while ensuring that the airflow containing respirable dust is stable, the fan can be turned on for 20 seconds or 40 seconds and then turned off, or other set time that can meet the needs.

[0035] The respirable dust concentration measurement method of the present invention can be measured using the respirable dust concentration measurement sensor device introduced in the background art, or can be measured using the respirable dust concentration measurement sensor device described below.

[0036] Embodiments of the respirable dust concentration measurement sensor device of the present invention:

[0037] like Figure 1 , Figure 2 As shown, the respirable dust concentration measurement sensor device includes an outer shell 1 and a separation module, a dust measuring passage, a dust exhaust passage, a dust measuring fan 10 and a dust exhaust fan 14 installed on the outer shell 1. The outer shell 1 is a closed shell, and a part of it is hidden in the figure to show the internal structure. The separation module is a cyclone separator 2, and the dust measuring passage includes a corner joint 3, a transfer main body section 4, an upstream section 5 of the dust measuring passage, a dust concentration detection module 6, a three-way joint 7, an electric valve of the dust measuring passage 8, and a downstream section 9 of the dust measuring passage, which are arranged in sequence from upstream to downstream. One end of the dust measuring passage is connected to the cyclone separator 2, and the other end is connected to the dust measuring fan 10. The dust exhaust passage includes a dust storage box 11, an electric valve of the dust exhaust passage 12, and a main section of the dust exhaust passage 13, which are arranged in sequence from upstream to downstream. One end of the dust exhaust passage is connected to the cyclone separator 2, and the other end is connected to the dust exhaust fan 14. When measuring the concentration of respirable dust, the dust-laden airflow enters the cyclone separator 2 to separate the respirable dust from the coarse particle dust. The direction of the airflow containing respirable dust is from the upstream to the downstream of the dust measuring passage, and the direction of the coarse particle dust airflow is from the upstream to the downstream of the dust exhaust passage. The separated respirable dust can be measured for concentration through the dust measuring passage under the action of the dust measuring fan 10, and the coarse particle dust can be discharged through the dust exhaust passage under the action of the dust exhaust fan 14 when it needs to be discharged. Respirable dust and coarse particle dust are discharged using different passages and fans respectively, and the passage is not easily blocked due to dust accumulation when the dust amount is large, which is conducive to reliable use.

[0038] The power of the dust exhaust fan 14 is greater than that of the dust measuring fan 10. The dust exhaust fan 14 with a larger power is used to discharge heavier and larger coarse dust particles, so that the power of the dust measuring fan 10 is smaller, which can reduce energy consumption while meeting the separation of respirable dust. Different fans are used for the dust measuring passage and the dust exhaust passage, which is convenient for flexible setting according to needs. The dust exhaust fan 14 is an axial flow fan, and the dust measuring fan 10 is a vortex fan. They are set differently based on the different dust conditions in the dust measuring passage and the dust exhaust passage. The turbine fan has a stronger negative pressure ability to separate dust, and the axial flow fan has fewer blades to discharge large dust particles. Since the respirable dust has a small particle size and the cyclone separator 2 requires a stable large air volume, a stable vortex fan is used. The remaining coarse dust particles with larger particle sizes are led out by the axial flow fan with a large outlet area, so that the sensor equipment is not easy to accumulate dust and can work stably for a long time.

[0039] The cyclone separator 2 has an inner outlet located in the inner cavity of the outer shell 1 of the respirable dust concentration measuring sensor device and an outer outlet located outside the outer shell 1. The inner outlet is connected to the dust storage box 11 of the dust exhaust passage, and the outer outlet is connected to the corner joint 3 of the dust measuring passage. The corner joint 3 is connected to the adapter main section 4 and together constitutes the adapter section of the dust measuring passage located outside the outer shell 1. The adapter main section 4 is connected to the upstream section 5 of the dust measuring passage. The upstream section 5 of the dust measuring passage is connected to the dust concentration detection module 6. The dust concentration detection module 6 can adopt a laser detection device. Its detection principle is the existing technology and will not be repeated here. The dust concentration detection module 6 is connected to the calibration passage and the dust measuring passage electric valve 8 through the three-way joint 7. The calibration passage includes the calibration passage main section 15 and the calibration interface 16. The dust measuring passage electric valve 8 is connected to the dust measuring passage downstream section 9. The dust measuring passage downstream section 9 is connected to the dust measuring fan 10. The dust measuring passage upstream section 5, the dust concentration detection module 6, the three-way joint 7, the dust measuring passage electric valve 8, and the dust measuring passage downstream section 9 together form the main section of the dust measuring passage located in the inner cavity of the outer shell 1, so that the dust measuring passage has a transfer section located outside the outer shell 1 to facilitate the connection of the cyclone separator 2 and reduce the size of the outer shell 1. The cyclone separator 2 is detachably connected to the outer shell 1 and the dust exhaust passage, and the transfer section of the dust measuring passage is detachably connected to the main section, that is, the transfer main section 4 is detachably connected to the upstream section 5 of the dust measuring passage. A quick-release structure can be used here to facilitate the removal of the cyclone separator 2 and the transfer section installed in the outer space of the outer shell 1 from the outer shell 1 as a whole, which is convenient for maintenance.

[0040] The dust storage box 11 of the dust exhaust passage is connected to the dust exhaust passage electric valve 12, the dust exhaust passage electric valve 12 is connected to the dust exhaust passage main section 13, the dust exhaust passage main section 13 is connected to the dust exhaust fan 14, and the dust storage box 11, the dust exhaust passage electric valve 12, and the dust exhaust passage main section 13 are arranged in the inner cavity of the outer shell 1. The inner cavity of the dust storage box 11 of the dust exhaust passage constitutes a dust storage cavity arranged downstream of the separation module on the dust exhaust passage. The dust storage box 11 can store a certain amount of coarse dust particles, reduce the frequency of opening the dust exhaust fan 14, and save energy consumption.

[0041] The dust measuring circuit electric valve 8 constitutes a switching valve on the dust measuring passage, and the dust exhaust circuit electric valve 12 constitutes a switching valve on the dust exhaust passage. The switching valve is used to conveniently control the on-off of the passage. When measuring the concentration of respirable dust, the dust exhaust circuit electric valve 12 can be closed. When coarse dust particles need to be discharged, the dust measuring circuit electric valve 8 can be closed, which is beneficial to reduce energy consumption when the fan is turned on.

[0042] The three-way joint 7 of the dust measuring passage is connected to one end of the calibration passage main body section 15 of the calibration passage, and the other end of the calibration passage main body section 15 is provided with a calibration interface 16, which is installed on the outer shell 1 for connecting with an external calibration device. By setting the calibration passage, the internal dust concentration detection module 6 can be calibrated without disassembling the respirable dust concentration measurement sensor device, which is convenient for operation.

[0043] When measuring the concentration of respirable dust, the calibration interface 16 is sealed with a nut, the dust exhaust circuit electric valve 12 is closed, the dust measuring circuit electric valve 8 is opened, the vortex fan is powered on, and the dust-laden air enters from the cyclone separator 2 through the suction of the vortex fan. Large particles of dust are deposited in the ash storage box. The respirable dust enters the dust concentration detection module 6 through the corresponding pipe section of the dust measuring passage, and is then discharged into the atmosphere through the dust measuring circuit electric valve 8 and the vortex fan.

[0044] The outer shell 1 of the respirable dust concentration measurement sensor device is provided with a controller for implementing the respirable dust concentration measurement method when executing a computer program. The controller has a carrier of the corresponding computer program and is used to control the operation of each component. The dust measuring fan 14 is a fan that needs to be turned on when measuring the respirable dust concentration. The respirable dust concentration measurement sensor device can be used to enable the respirable dust concentration measurement method to have two dust measurement modes:

[0045] Short-distance dust measurement mode: In this mode, the dust exhaust circuit electric valve 12 and the dust exhaust fan 14 are in a closed state; when measuring, first open the dust measurement circuit electric valve 8, and keep it in an open state after the electric valve is fully opened, and then turn on the dust measurement fan 10 and the dust concentration detection module 6 to measure the respirable dust concentration; this mode is suitable for short-distance load scenarios, with shorter cables and less loss, which can meet the power supply requirements for measurement when the dust measurement fan and the dust concentration detection module are working at the same time.

[0046] Long-distance dust measurement mode: In this mode, the dust exhaust circuit electric valve 12 and the dust exhaust fan 14 are in a closed state; when measuring, first open the dust measurement circuit electric valve 8, and keep it in an open state after the electric valve is fully opened, start the dust measurement fan 10, and after the dust measurement fan 10 has worked for 30 seconds, turn off the dust measurement fan 10, and immediately turn on the dust concentration detection module 6, measure once per second, measure the respirable dust concentration three times and take the average value to obtain the respirable dust concentration measurement result; turn off the dust concentration detection module 6, and repeat the above process to perform cyclic measurement; make the dust measurement fan and the concentration detection module of the respirable dust concentration measurement sensor equipment work in time-sharing, and obtain the respirable dust concentration by measuring the instantaneous airflow after the fan is turned off. While ensuring that the respirable dust concentration measurement result is accurate and effective, by making the dust measurement fan and the concentration detection module work separately, the power load at the same time during the measurement process can be reduced, and the load requirement of the respirable dust concentration measurement sensor equipment is reduced, which is convenient for using longer cables and is conducive to adapting to long-distance load-bearing usage scenarios.

[0047] After the dust measurement is completed, the respirable dust concentration measurement sensor device can enter the dust exhaust mode, the calibration interface 16 is sealed with a nut, the dust exhaust circuit electric valve 12 is opened, the dust measurement circuit electric valve 8 is closed, the axial flow fan is powered on, and the air enters from the cyclone separator 2 through the suction of the axial flow fan. The airflow drives the large particles of dust accumulated in the inner cavity of the ash storage box and is discharged into the atmosphere through the dust exhaust circuit electric valve 12 and the corresponding pipe section of the dust exhaust passage and the axial flow fan. By actively cleaning the dust inside the sensor device, long-term online operation can be guaranteed. After the dust removal work is completed, the dust concentration detection module can be turned on for zero drift calibration to improve the long-term working accuracy of the equipment and reduce the maintenance workload. The dust measurement mode and dust exhaust mode of the respirable dust concentration measurement sensor device are carried out separately. If the two do not work at the same time, the power load demand can be reduced.

[0048] When the respirable dust concentration measurement sensor equipment is calibrated: the dust exhaust circuit electric valve 12 is closed, the dust measuring circuit electric valve 8 is closed, and the calibration equipment is connected via the calibration interface 16. The dust-laden air passes through the suction of the calibration equipment and enters from the cyclone separator 2. Large dust particles are deposited in the ash storage chamber. The respirable dust passes through the corresponding pipe section of the dust measuring pipeline and enters the dust concentration detection module 6, and then enters the calibration equipment through the calibration passage. The dust concentration detection module 6 is calibrated by the calibration equipment.

[0049] In other implementations, the dust detection passage and the dust exhaust passage may also share a fan, in which case a switch valve may not be provided.

[0050] In other implementations, the inner cavity of the pipeline may be used to temporarily store coarse dust particles without providing a separate dust storage cavity.

[0051] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions recorded in the aforementioned embodiments without creative work, or replace some of the technical features therein with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for measuring respirable dust concentration, characterized in that: Turn on the fan of the respirable dust concentration measurement sensor device to allow the dust-laden air to enter the separation module of the respirable dust concentration measurement sensor device. When the separated airflow containing the respirable dust stably passes through the concentration detection module of the respirable dust concentration measurement sensor device, turn off the fan, and then turn on the concentration detection module to measure the respirable dust concentration at the concentration detection module to obtain the respirable dust concentration measurement result.

2. The method for measuring respirable dust concentration according to claim 1, characterized in that: When the concentration detection module is turned on for measurement, the respirable dust concentration is measured once every certain period of time, and the respirable dust concentration is measured multiple times and the average value is taken as the measurement result.

3. The method for measuring respirable dust concentration according to claim 2, characterized in that: The interval between two adjacent measurements is 0.5-1.5 seconds.

4. The method for measuring respirable dust concentration according to claim 1, 2 or 3, characterized in that: Turn on the fan for the set time and then turn it off.

5. The method for measuring respirable dust concentration according to claim 1, 2 or 3, characterized in that: After obtaining a measurement result of the respirable dust concentration, turn off the concentration detection module, turn on the fan, and perform periodic cycle measurement.

6. A respirable dust concentration measurement sensor device, characterized in that: The invention comprises a controller for implementing the respirable dust concentration measurement method according to any one of claims 1 to 5 when executing a program.

7. The respirable dust concentration measuring sensor device according to claim 6, characterized in that: The respirable dust concentration measurement sensor device includes a dust measuring passage and a dust exhaust passage. One end of the dust measuring passage is connected to the separation module, and the other end is connected to the dust measuring fan. One end of the dust exhaust passage is connected to the separation module, and the other end is connected to the dust exhaust fan. The dust measuring fan is a fan that needs to be turned on when measuring the respirable dust concentration.

8. The respirable dust concentration measuring sensor device according to claim 7, characterized in that: The dust measuring passage and the dust exhaust passage are respectively provided with switch valves.

9. The respirable dust concentration measuring sensor device according to claim 8, characterized in that: A dust storage chamber is provided on the dust exhaust passage downstream of the separation module.

10. The respirable dust concentration measurement sensor device according to any one of claims 7 to 9, characterized in that: The dust measuring passage is also connected to a calibration passage, and the calibration passage is provided with a calibration interface for connecting to a calibration device.

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