Sampling system suitable for traffic tunnel atmospheric particulate traceability

Abstract

The utility model relates to the technical field of atmospheric particulate sampling, in particular to a sampling system applicable to traffic tunnel atmospheric particulate tracing, which comprises a driving component, a sampling barrel and a sampling component, the sampling component is clamped in the sampling barrel, and the driving component is used for pushing / pulling the sampling component to slide in the sampling barrel; the sampling assembly comprises a sampling disc, a first filtering membrane is arranged on the sampling disc, an exhaust valve is further arranged on the sampling disc, and an air inlet valve is arranged on one side of the closed end of the sampling barrel. The sliding stroke of the sampling disc pushed / pulled by the driving assembly in the sampling barrel is constant, so that the volume of air sucked into and discharged out of the sampling barrel each time can be obtained by multiplying the cross sectional area of the sampling barrel by the stroke, the sampling process is repeated for multiple times, and the volume of the air sucked each time is accumulated, so that the sampling accuracy is improved. And finally, the total volume of the sampled air can be accurately obtained. And compared with the prior art, the calculation accuracy of the mass concentration of the particulate matters is remarkably improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to atmospheric particulate matter sampling technical field especially suitable for traffic tunnel atmospheric particulate matter tracing sampling system. BACKGROUND

[0002] Traffic tunnel is a kind of semi-closed linear limited space, and its environmental characteristics are significantly different from open atmospheric environment. Motor vehicle exhaust is continuously discharged and quickly accumulates in limited space, forming high-concentration pollutant accumulation area. Studies have shown that PM2.5 concentration in the tunnel can reach 5-10 times of that on open road. Long-term exposure can induce respiratory diseases, cardiovascular damage and even cancer, posing significant health threats to drivers and passengers, tunnel maintenance workers and surrounding residents (diffused through exhaust port). Therefore, accurate and efficient monitoring and sampling of particulate matter concentration in the tunnel are important prerequisites for environmental assessment and pollution control.

[0003] At present, the sampling of particulate pollutants in the tunnel usually adopts active sampling method, that is, the air in the tunnel is sucked into the sampling head by providing suction through the sampling pump. The particulate matter is intercepted by the filter membrane during the flow through the sampling head. After weighing in the laboratory, the mass of particulate matter and the volume of air flowing through the sampling head are calculated to obtain the daily average concentration of particulate matter in the tunnel. However, this sampling method still has deficiencies, as described below.

[0004] During the sampling process, as time goes on, the filter membrane will be gradually clogged due to interception of particulate matter, resulting in continuous increase of air flow resistance. Under the condition that the operating power of the sampling pump remains unchanged, the total amount of air sucked into the sampling head per unit time will gradually decrease, causing the final sampled air volume to be inaccurate, which further affects the accuracy of particulate matter mass concentration calculation.

[0005] Therefore, in the operation of tunnel atmospheric particulate matter concentration monitoring, how to accurately measure the total volume of collected air and further improve the accuracy of particulate matter mass concentration calculation is a technical problem to be solved in the prior art. UTILITY MODEL CONTENTS

[0006] The utility model aims at the problem in the prior art that during the sampling process, as time goes on, the filter membrane will be gradually clogged due to interception of particulate matter, resulting in continuous increase of air flow resistance. Under the condition that the operating power of the sampling pump remains unchanged, the total amount of air sucked into the sampling head per unit time will gradually decrease, causing the final sampled air volume to be inaccurate, which further affects the accuracy of particulate matter mass concentration calculation. The utility model provides a sampling system suitable for traffic tunnel atmospheric particulate matter tracing.

[0007] To achieve the above-mentioned purpose, the utility model adopts the technical scheme that:

[0008] A sampling system suitable for tracing atmospheric particulate matter in traffic tunnels, comprising a driving assembly, a sampling cylinder and a sampling assembly, one end of the sampling cylinder is a closed structure and the other end is an open port, the sampling assembly is clamped in the sampling cylinder, the driving assembly is arranged at the open port end of the sampling cylinder, the driving assembly is connected with the sampling assembly, and the driving assembly is used to push / pull the sampling assembly to slide in the sampling cylinder;

[0009] The sampling assembly comprises a sampling disc, the diameter of the sampling disc matches the inner diameter of the sampling cylinder, and one side of the sampling disc opposite to the closed end of the sampling cylinder is provided with a first filter membrane for trapping particulate pollutants,

[0010] An exhaust valve is further arranged on the sampling disc, and an air inlet valve is arranged on one side of the closed end of the sampling cylinder, when the driving assembly pulls the sampling disc to move to one side of the open end of the sampling cylinder, the air inlet valve forms an open state, and the exhaust valve forms a closed state; when the driving assembly pushes the sampling disc to move to one side of the closed end of the sampling cylinder, the exhaust valve forms an open state, and the air inlet valve forms a closed state.

[0011] Preferably, the sampling cylinder is installed at the top of the tunnel, and the sampling cylinder is fixed in a vertical state.

[0012] Preferably, a filter screen cylinder is vertically arranged on the sampling disc, the filter screen cylinder extends to one side of the closed end of the sampling cylinder, the filter screen cylinder communicates with the cavity of the exhaust valve, and the outer surface of the filter screen cylinder is provided with a second filter membrane for trapping particulate pollutants.

[0013] Preferably, the top of the filter screen cylinder is further provided with a gland, the inside of the gland is provided with a containing cavity, the inner diameter of the containing cavity matches the outer diameter of the filter screen cylinder, and a reset spring is further arranged between the gland and the filter screen cylinder, the gland and the filter screen cylinder have a first matching mode and a second matching mode,

[0014] In the first matching mode, the reset spring is in a natural relaxation state, and the filter screen cylinder is located outside the containing cavity of the gland; in the second matching mode, the reset spring is compressed, and the filter screen cylinder is accommodated in the containing cavity of the gland.

[0015] Preferably, a scraper is arranged at the opening of the gland, and the scraper is used to scrape off part of the particulate pollutants trapped on the second filter membrane during the matching mode transition of the gland and the filter screen cylinder.

[0016] Preferably, when the gland and the filter screen cylinder form the second matching mode, a gap is formed between the gland and the sampling disc.

[0017] Preferably, the top of the gland is provided with a buffer rubber pad.

[0018] Preferably, the surface of the sampling disc is further provided with an ash collecting ring groove for collecting the particulate pollutants scraped off from the second filter membrane.

[0019] Preferably, the edge of the sampling disc is further provided with a fence.

[0020] Preferably, the filter screen cylinder is in separable connection with the gland and the sampling disc.

[0021] In summary, due to the adoption of the above technical solutions, the present application has the following beneficial effects:

[0022] 1. The sampling system suitable for tracing the particulate matters in the atmosphere of traffic tunnel, by the driving assembly controlling the sliding of the sampling disc in the sampling cylinder, and cooperating with the opening and closing states of the air inlet valve and the air outlet valve, the sampling of the air in the tunnel and the interception of the particulate matters are realized. Specifically, when the driving assembly pulls the sampling disc to move towards the open end, the air inlet valve is opened, the air outlet valve is closed, the air in the tunnel enters the sampling cylinder through the air inlet valve, and the particulate matters are intercepted when the air flows through the first filter membrane; when the driving assembly pushes the sampling disc to move towards the closed end, the air outlet valve is opened, the air inlet valve is closed, and the filtered air is discharged through the air outlet valve. In the embodiment, the stroke of the driving assembly in pushing / pulling the sampling disc to slide in the sampling cylinder is constant, thus the volume of the air inhaled and discharged in the sampling cylinder each time can be obtained by multiplying the cross-sectional area of the sampling cylinder with the stroke, and the total volume of the sampled air can be accurately obtained by accumulating the volume of the air inhaled each time through repeating the above sampling process. Compared with the prior art, the problem of inaccurate calculation of the total volume of the air is effectively solved, and the accuracy of the calculation of the mass concentration of the particulate matters is significantly improved.

[0023] 2. The sampling system suitable for tracing the particulate matters in the atmosphere of traffic tunnel, in the cooperation form changing process of the gland and the filter screen cylinder, the scraper slides along the surface of the second filter membrane, so that the particulate pollutants attached to the surface of the second filter membrane are separated, the risk of the second filter membrane being blocked due to excessive accumulation of the particulate matters is reduced, and the stable operation of the system is further ensured. When the driving assembly pushes the sampling disc to move towards one side of the closed end of the sampling cylinder for air discharge operation, the reset spring between the gland and the filter screen cylinder is compressed, and the impact force received by the sampling disc can be buffered, so that the sampling disc and the filter screen cylinder and other components are protected from being damaged, and the service life of the present application is effectively prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 This is a schematic diagram of the cross-section of a sampling system suitable for tracing the source of atmospheric particulate matter in traffic tunnels;

[0025] Figure 2 This is a structural diagram of the first mating configuration between the pressure cap and the filter cylinder;

[0026] Figure 3 This is a structural diagram of the second mating configuration between the cap and the filter cylinder.

[0027] The markings in the diagram are: 1-Drive assembly, 2-Sampling cylinder, 3-Sampling assembly, 4-Sampling disc, 5-First filter membrane, 6-Exhaust valve, 7-Inlet valve, 8-Filter screen cylinder, 9-Second filter membrane, 10-Capping, 11-Receiving cavity, 12-Reset spring, 13-Scraper, 14-Buffer rubber pad, 15-Dust collection ring groove, 16-Enclosure. Detailed Implementation

[0028] The present invention will now be described in detail with reference to the accompanying drawings.

[0029] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0030] Example 1: As Figure 1 As shown, the sampling system for tracing atmospheric particulate matter sources in traffic tunnels according to this utility model includes a driving component 1, a sampling cylinder 2, and a sampling component 3. One end of the sampling cylinder 2 is a closed structure and the other end is an open opening. The sampling component 3 is snapped into the sampling cylinder 2. The driving component 1 is disposed at the open end of the sampling cylinder 2 and is connected to the sampling component 3. The driving component 1 is used to push / pull the sampling component 3 to slide within the sampling cylinder 2.

[0031] The sampling assembly 3 includes a sampling disk 4, the diameter of which matches the inner diameter of the sampling cylinder 2. A first filter membrane 5 for trapping particulate pollutants is provided on the side of the sampling disk 4 facing the closed end of the sampling cylinder 2.

[0032] The sampling disk 4 is also provided with an exhaust valve 6, and an air inlet valve 7 is provided on the closed end side of the sampling cylinder 2. When the driving component 1 pulls the sampling disk 4 to the open end side of the sampling cylinder 2, the air inlet valve 7 is in the open state and the exhaust valve 6 is in the closed state; when the driving component 1 pushes the sampling disk 4 to the closed end side of the sampling cylinder 2, the exhaust valve 6 is in the open state and the air inlet valve 7 is in the closed state.

[0033] The sampling system for tracing atmospheric particulate matter in traffic tunnel of the new type is used to control the sliding of the sampling disc 4 in the sampling cylinder 2 by the driving assembly 1, and to realize the sampling of the air in the tunnel and the interception of the particulate matter by the opening and closing of the air inlet valve 7 and the air outlet valve 6. Specifically, when the driving assembly 1 pulls the sampling disc 4 to move towards the open end, the air inlet valve 7 is opened, the air outlet valve 6 is closed, the air in the tunnel enters the sampling cylinder 2 through the air inlet valve 7, and the particulate matter is intercepted when the air flows through the first filter membrane 5; when the driving assembly 1 pushes the sampling disc 4 to move towards the closed end, the air outlet valve 6 is opened, the air inlet valve 7 is closed, and the filtered air is discharged through the air outlet valve 6. In the embodiment, the driving assembly 1 pushes / pulls the sampling disc 4 to slide in the sampling cylinder 2 with a constant stroke, so that the volume of the air inhaled and discharged in the sampling cylinder 2 each time can be obtained by multiplying the cross-sectional area of the sampling cylinder 2 by the stroke, and the total volume of the sampled air can be accurately obtained by accumulating the volume of the air inhaled each time through the repeated sampling process. Compared with the prior art, the problem of inaccurate calculation of the total volume of the air is effectively solved, and the accuracy of the calculation of the mass concentration of the particulate matter is significantly improved.

[0034] Specifically, the driving assembly 1 in the embodiment is an electric telescopic push rod. The electric telescopic push rod is fixed on one side of the open end of the sampling cylinder 2, and the end of the push rod is connected with the sampling disc 4. A storage battery is further arranged on the sampling cylinder 2 to drive the electric telescopic push rod to act;

[0035] The closed end of the sampling cylinder 2 is provided with a screw cap structure, which is convenient for disassembly and assembly. When the trapped particulate pollutant sample needs to be extracted, the screw cap is opened to take out the sampling disc 4; after the sampling or replacement of parts is completed, the screw cap is installed to ensure the sealing of the system.

[0036] As a preferred embodiment, on the basis of the above-mentioned mode, further, the sampling cylinder 2 is installed on the top of the tunnel, and the sampling cylinder 2 is fixed in a vertical state.

[0037] The sampling cylinder 2 in the vertical state in the embodiment is beneficial to the use of gravity to make the trapped particulate pollutants more naturally deposit and gather on the first filter membrane 5, thereby improving the interception effect of the particulate matter pollutants. At the same time, by using this structure, the spilling or splashing of the pollutants during the extraction of the particulate pollutant sample can be prevented, and the integrity of the sample extraction is ensured.

[0038] Embodiment 2: as Figure 2 and Figure 3As shown, the sampling system for tracing the source of atmospheric particulate matter in traffic tunnels according to this utility model, based on the above-mentioned method, further includes a filter cylinder 8 vertically arranged on the sampling disk 4. The filter cylinder 8 extends towards the closed end of the sampling cylinder 2 and communicates with the cavity of the exhaust valve 6. A second filter membrane 9 for intercepting particulate pollutants is provided on the outer surface of the filter cylinder 8. This structural arrangement enhances the smoothness of air discharge from the sampling cylinder 2. At the same time, the arrangement of the filter cylinder 8 and the second filter membrane 9 reduces the risk of the drive component 1 malfunctioning due to complete blockage of the filter membrane during sampling, thereby improving the stability and reliability of this novel sampling system.

[0039] In a preferred embodiment, based on the above method, a pressure cap 10 is further provided on the top of the filter cylinder 8. The pressure cap 10 has an internal receiving cavity 11, the inner diameter of which matches the outer diameter of the filter cylinder 8. A return spring 12 is also provided between the pressure cap 10 and the filter cylinder 8. The pressure cap 10 and the filter cylinder 8 have a first mating configuration and a second mating configuration.

[0040] In the first engagement configuration, the return spring 12 is in a naturally relaxed state, and the filter cylinder 8 is located outside the receiving cavity 11 of the pressure cap 10; in the second engagement configuration, the return spring 12 is compressed, and the filter cylinder 8 is housed outside the receiving cavity 11 of the pressure cap 10.

[0041] A scraper 13 is provided at the opening of the pressure cap 10. The scraper 13 is used to scrape off part of the particulate pollutants trapped on the second filter membrane 9 during the transformation of the pressure cap 10 and the filter cylinder 8.

[0042] Specifically, in this embodiment, when the driving component 1 pushes the sampling disk 4 to move towards the closed end of the sampling cylinder 2, the pressure cap 10 and the filter cylinder 8 maintain a first engagement state; when the top of the pressure cap 10 abuts against the closed end of the sampling cylinder 2, the return spring 12 is compressed, the pressure cap 10 slides downward to completely house the sampling cylinder 2 in the receiving cavity 11, and the pressure cap 10 and the filter cylinder 8 change to a second engagement state;

[0043] When the drive assembly 1 pulls the sampling disk 4 toward the open end of the sampling cylinder 2, the reset spring 12 gradually relaxes, the pressure cap 10 slides upward under the drive of the reset spring 12, and the filter cylinder 8 gradually disengages from the receiving cavity 11 of the pressure cap 10. When the pressure cap 10 is completely separated from the closed end of the sampling cylinder 2, the pressure cap 10 and the filter cylinder 8 change to the first mating state.

[0044] In this embodiment, during the transformation process of the pressure cap 10 and the filter cylinder 8, the scraper 13 slides along the surface of the second filter membrane 9, causing particulate pollutants attached to the surface of the second filter membrane 9 to detach, reducing the risk of clogging of the second filter membrane 9 due to excessive accumulation of particulate matter, thereby further ensuring the stable operation of the system. Furthermore, when the drive assembly 1 pushes the sampling disk 4 towards the closed end of the sampling cylinder 2 for exhaust operation, the return spring 12 between the pressure cap 10 and the filter cylinder 8 is compressed, which buffers the impact force on the sampling disk 4, thus protecting the sampling disk 4 and the filter cylinder 8 from damage and effectively extending the service life of this invention.

[0045] In a preferred embodiment, based on the above method, when the pressure cap 10 and the filter cylinder 8 form a second mating configuration, a gap is formed between the pressure cap 10 and the sampling disk 4. This structural arrangement avoids direct contact and friction / collision between the pressure cap 10 and the sampling disk 4 during sliding, protecting the structural integrity of the first filter membrane 5. Simultaneously, after the scraper 13 removes particulate contaminants from the second filter membrane 9, these contaminants can fall into the gap between the pressure cap 10 and the sampling disk 4, preventing contaminants from re-adhering to the second filter membrane 9. This improves the practicality of this invention in actual use.

[0046] As a preferred embodiment, based on the above method, a buffer rubber pad 14 is further provided on the top of the pressure cover 10.

[0047] As a preferred embodiment, based on the above method, the sampling disc 4 is further provided with a dust collection ring groove 15, which is used to collect particulate pollutants scraped off the second filter membrane 9. This structural arrangement prevents excessive accumulation of scraped particulate pollutants at the bottom of the filter cylinder 8, thus avoiding obstruction of the normal sliding of the pressure cap 10, thereby further improving the practicality and reliability of this invention in actual use.

[0048] As a preferred embodiment, based on the above method, the sampling disk 4 is further provided with a barrier 16 around its edge.

[0049] The enclosure 16 described in this embodiment can prevent particulate pollutants collected on the sampling tray 4 from spilling during sampling, thereby further ensuring the integrity of sample extraction.

[0050] In a preferred embodiment, based on the above method, the filter cylinder 8 is further configured to be separable from the pressure cap 10 and the sampling disc 4. With this structural arrangement,

[0051] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A sampling system suitable for atmospheric particulate matter tracing in traffic tunnels, characterized in that, The sampling device comprises a driving assembly, a sampling cylinder and a sampling assembly, one end of the sampling cylinder is closed and the other end is open, the sampling assembly is clamped in the sampling cylinder, the driving assembly is arranged at the open end of the sampling cylinder, the driving assembly is connected with the sampling assembly, and the driving assembly is used for pushing / pulling the sampling assembly to slide in the sampling cylinder; The sampling assembly comprises a sampling disc, the diameter of the sampling disc matches the inner diameter of the sampling cylinder, and a first filter film for trapping particulate pollutants is arranged on the side of the sampling disc opposite to the closed end of the sampling cylinder, An exhaust valve is further arranged on the sampling disc, an air inlet valve is arranged on the side of the closed end of the sampling cylinder, when the driving assembly pulls the sampling disc to move to the side of the open end of the sampling cylinder, the air inlet valve is in an open state, and the exhaust valve is in a closed state; when the driving assembly pushes the sampling disc to move to the side of the closed end of the sampling cylinder, the exhaust valve is in an open state, and the air inlet valve is in a closed state.

2. The sampling system suitable for source apportionment of atmospheric particulate matter in traffic tunnels according to claim 1, characterized in that, The sampling cylinder is installed on the top of a tunnel, and the sampling cylinder is fixed in a vertical state.

3. The sampling system suitable for tracing the origin of atmospheric particulate matters in traffic tunnels according to claim 2, characterized in that, A filter screen cylinder is vertically arranged on the sampling disc, the filter screen cylinder extends to the side of the closed end of the sampling cylinder, the filter screen cylinder is in communication with the cavity of the exhaust valve, and a second filter film for trapping particulate pollutants is arranged on the outer surface of the filter screen cylinder.

4. The sampling system suitable for tracing the atmospheric particulate matters in traffic tunnels according to claim 3, characterized in that, A gland is further arranged at the top of the filter screen cylinder, an accommodating cavity is arranged in the interior of the gland, the inner diameter of the accommodating cavity matches the outer diameter of the filter screen cylinder, a reset spring is further arranged between the gland and the filter screen cylinder, and the gland and the filter screen cylinder have a first matching mode and a second matching mode, In the first matching mode, the reset spring is in a natural relaxation state, and the filter screen cylinder is located outside the accommodating cavity of the gland; In the second matching mode, the reset spring is compressed, and the filter screen cylinder is accommodated in the accommodating cavity of the gland.

5. The sampling system suitable for the atmospheric particulate matter tracing of traffic tunnels according to claim 4, characterized in that, A scraper is arranged at the opening of the gland, and the scraper is used for scraping off part of the particulate pollutants trapped on the second filter film during the change of the matching mode of the gland and the filter screen cylinder.

6. The sampling system suitable for tracing the origin of atmospheric particulate matter in traffic tunnels according to claim 5, characterized in that, When the second matching mode is formed between the gland and the filter screen cylinder, a gap is formed between the gland and the sampling disc.

7. The sampling system suitable for the atmospheric particulate matter tracing of traffic tunnels according to claim 6, characterized in that, A buffer rubber pad is arranged at the top of the gland.

8. The sampling system suitable for tracing the origin of atmospheric particulate matter in traffic tunnels according to claim 7, characterized in that, A dust collection ring groove is further arranged on the surface of the sampling disc, and the dust collection ring groove is used for collecting the particulate pollutants scraped off from the second filter film.

9. The sampling system suitable for the atmospheric particulate matter tracing of traffic tunnels according to claim 8, characterized in that, A fence is further arranged on the edge of the sampling disc.

10. The sampling system suitable for the atmospheric particulate matter tracing of traffic tunnels according to claim 9, characterized in that, The filter screen cylinder, the gland and the sampling disc are in separable connection.

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