An aerosol sampling device with high spatiotemporal resolution

Abstract

The present application relates to aerosol sampling device, specifically to a kind of aerosol sampling device with high space-time resolution, solve the technical problem that the sampling result of existing aerosol sampling device is inaccurate, inconvenient to install.The aerosol sampling device provided by the present application includes at least one sampling unit.The sampling unit includes an independent power supply, an inductor, a delay controller, an actuator, a first control valve, a filter and a vacuum container electrically connected with the independent power supply respectively, the inductor collects aerosol generation signal, the delay controller receives aerosol generation signal and controls the actuator to open the first control valve, the vacuum container is used as suction power, and air flow is sucked into the filter to start sampling.The present application can realize automatic start sampling, has high space-time resolution, accurate sampling result, simple structure, convenient installation and good reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to an aerosol sampling device, in particular to an aerosol sampling device with high temporal and spatial resolution. BACKGROUND

[0002] In the research scene of explosion smoke, accident atmospheric pollution, etc., the concentration, particle size and composition of aerosol will change rapidly with time, or move rapidly in space. In order to study the composition of aerosol and its change with time and space, it is necessary to sample aerosol with time and spatial resolution in a large range.

[0003] The traditional aerosol sampling method is mainly as follows: multiple aerosol samplers are arranged in the research range, each aerosol sampler is configured with multiple sampling devices such as filters or impactors, multiple sampling devices share an air inlet pipe, and the sampling device is switched at regular time; the sampling volume is measured by an online flow meter; and an electric air pump is used as the air pumping power. The above method has the following problems:

[0004] (1) Since the flow of the sampling device will first rise and then fall during switching, if the sampling duration is very short, the accuracy of the sampling volume measured by the online flow meter is poor;

[0005] (2) When collecting high-concentration aerosol, aerosol may be deposited in the shared air inlet pipe, and the aerosol deposited in the shared air inlet pipe will be suspended when collecting low-concentration aerosol in the subsequent process, thereby causing sample contamination;

[0006] (3) The starting power of the electric air pump is large, and a large power supply needs to be externally connected. In the scene of explosion test, the externally connected power supply wire needs to be specially protected;

[0007] (4) If an electromagnetic valve is used for the air inlet valve, the aerosol loss in the valve air flow channel is serious, and if a ball valve is used, the commercially available electric actuator or starting actuator matched with the ball valve is large in size and inconvenient to install. SUMMARY

[0008] The purpose of the present application is to solve the technical problems of inaccurate sampling results and inconvenient installation of the existing aerosol sampling device, and to provide an aerosol sampling device with high temporal and spatial resolution.

[0009] To achieve the above purpose, the technical scheme adopted by the present application is:

[0010] An aerosol sampling device with high temporal and spatial resolution, characterized in that it comprises at least one sampling unit;

[0011] The sampling unit comprises an independent power supply 1, an inductor 2, a time delay controller 3 and an actuator 4 which are electrically connected with the independent power supply 1 respectively, and a first control valve 5, a filter 6 and a vacuum container 7;

[0012] The inductor 2 is electrically connected with the time delay controller 3, for collecting aerosol generation signals and transmitting them to the time delay controller 3;

[0013] The time delay controller 3 is electrically connected with the actuator 4, for receiving the aerosol generation signals and sending control signals to the actuator 4 according to a preset time delay;

[0014] The actuator 4 is connected with the first control valve 5, for controlling the first control valve 5 to open according to the control signals sent by the time delay controller 3;

[0015] The first control valve 5 is installed at the air inlet of the filter 6, for controlling the air inlet of the filter 6;

[0016] The air outlet of the filter 6 is connected with the air inlet of the vacuum container 7, and the filter 6 is used for collecting aerosols;

[0017] The inside of the vacuum container 7 is preset to be vacuum, for providing power for sampling inhalation.

[0018] Further, the sampling unit is not less than two;

[0019] The sampling units are independent of each other.

[0020] Further, the inductor 2 is a vibration sensor;

[0021] The independent power supply 1 is a battery.

[0022] Further, the actuator 4 is a steering engine;

[0023] The first control valve 5 is a ball valve.

[0024] Further, the ball valve has a diameter of 5mm-20mm.

[0025] Further, the filter 6 adopts a filter membrane or a cascade impactor.

[0026] Further, the filter 6 adopts a filter membrane, and the filter membrane has a diameter of 20mm-50mm.

[0027] Further, the vacuum container 7 has a volume of 0.1L-3L.

[0028] Further, a second control valve 8 is further included.

[0029] The second control valve 8 is installed on the vacuum suction port of the vacuum container 7, and is used to cut off the vacuum pump outside the vacuum container 7 to extract the air in the vacuum container 7.

[0030] Further, the second control valve 8 is a needle valve.

[0031] Compared with the prior art, the present application has the beneficial technical effects as follows:

[0032] 1、The aerosol sampling device with high space-time resolution capability provided by the present application includes a plurality of sampling units distributed in a research range, and has high spatial resolution; the sampling unit collects aerosol generation signals through an inductor to automatically start sampling, can self-trigger all actions, does not need manual control, has high accuracy of sampling results, and has strong time resolution; the sampling unit is self-powered, does not need external power supply and control, does not need protective wires or sampling tubes in an explosion test scene, has simple structure, and is easy to install;

[0033] 2、In the aerosol sampling device with high space-time resolution capability provided by the present application, a vacuum container is used as a suction power, instead of an electric suction pump, so that power consumption can be reduced, a large battery or external power supply can be avoided, the weight of the sampling unit is reduced, the sampling volume of the vacuum container is accurate and controllable, and the problem of poor flow measurement accuracy in short-time sampling is avoided;

[0034] 3、In the aerosol sampling device with high space-time resolution capability provided by the present application, a steering engine is selected as an executor, and a ball valve is selected as a first control valve, so that the ball valve is controlled by the steering engine, the steering engine is smaller in size than a general electric executor or pneumatic executor, has simple structure, and has good reliability. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 FIG. 1 is a structural schematic view of a sampling unit of the aerosol sampling device with high space-time resolution capability;

[0036] The following signs are explained as follows:

[0037] 1-independent power supply, 2-inductor, 3-delay controller, 4-executor, 5-first control valve, 6-filter, 7-vacuum container, 8-second control valve. DETAILED DESCRIPTION

[0038] In order to make the purpose, advantages and characteristics of the present application clearer, the following further describes an aerosol sampling device with high space-time resolution capability in combination with the drawings and specific embodiments.

[0039] An aerosol sampling device with high space-time resolution capability includes at least one sampling unit, and when the number of sampling units is not less than two, the sampling units are independent of each other. Figure 1As shown, the sampling unit comprises an independent power supply 1, an inductor 2, a time delay controller 3, an actuator 4, a first control valve 5, a filter 6, a vacuum container 7 and a second control valve 8 installed on a vacuum air outlet of the vacuum container 7, which are electrically connected with the independent power supply 1 respectively. The independent power supply 1 is a battery. Due to the existence of the independent power supply 1, the sampling unit does not need external power supply and control, and does not need protective wire or sampling tube in the explosion test scene, which is simple in structure and easy to install.

[0040] The inductor 2 is electrically connected with the time delay controller 3, which is used to collect the aerosol generation signal and transmit it to the time delay controller 3. The time delay controller 3 is electrically connected with the actuator 4, which is used to receive the aerosol generation signal and send a control signal to the actuator 4 according to the pre-set time delay. In the embodiment, the inductor 2 selects a vibration sensor, which collects the vibration signal when the explosion or accident occurs and transmits the vibration signal to the time delay controller 3. The time delay of the time delay controller 3 is set according to the experimental purpose.

[0041] The actuator 4 is connected with the first control valve 5, which is used to control the first control valve 5 to open according to the control signal sent by the time delay controller 3. The first control valve 5 is installed on the air inlet of the filter 6, which is used to control the air inlet. In the embodiment, the filter 6 adopts a filter membrane with a diameter of 40 mm, which is used to capture all aerosol particles. In other embodiments, the filter 6 can also adopt a cascade impactor, which collects aerosols according to the size of the particle diameter. The air outlet of the filter 6 is connected with the air inlet of the vacuum container 7, and the filter 6 is used to collect aerosols, i.e. collect aerosol particles on the filter membrane. The inside of the vacuum container 7 is pre-vacuumized, which is used to provide the power of sampling air suction. The second control valve 8 is used to cut off the external vacuum pump to extract the air in the vacuum container 7, and the second control valve 8 adopts a needle valve as the valve when the vacuum container 7 is extracted.

[0042] The first control valve 5 adopts a ball valve with a diameter of 10 mm, and the actuator 4 adopts a rudder machine. The air inlet of the sampling unit is the air inlet of the filter 6, which uses the rudder machine to control the ball valve as the control of the air inlet. Compared with the electric or pneumatic actuator of the general valve, the rudder machine is small in size, simple in structure and good in reliability.

[0043] The pre-vacuumized vacuum container 7 is used as the air extraction power in the embodiment, which replaces the electric air extraction pump, reduces power consumption, avoids large batteries or external power supply, reduces the weight of the sampling unit, and is suitable for combination with the cascade sampling.

[0044] The volume of the vacuum container 7 is accurately controllable, which avoids the problem of poor flow measurement accuracy of short-time sampling and has high time resolution. In the embodiment, the volume of the vacuum container 7 is 1L.

[0045] The aerosol sampling device with high space-time resolution provided by the embodiment is integrated by a plurality of independent sampling units, has small volume, is convenient to use, and has high space resolution. The sampling unit collects vibration signals through a vibration sensor, thereby automatically starting sampling, can self-trigger all actions, does not need manual control, has high accuracy of sampling results, and has strong time resolution. The working principle is as follows:

[0046] First, the needle valve 8 is opened, air in the vacuum container 7 is extracted by using an air suction pump, and the vacuum container 7 is pre-vacuumized. Second, a delay time is set for the delay controller 3 based on a research purpose. When an explosion or an accident occurs, vibration is generated, the vibration sensor collects the vibration signal, and transmits the vibration signal to the delay controller 3. After the delay controller 3 receives the vibration signal, the delay controller 3 sends a control signal to the actuator 4 according to the pre-set delay time, controls the actuator 4 to open the first control valve 5, and because the vacuum container 7 is pre-vacuumized, a negative pressure is formed between the vacuum container 7, the filter 6, and the first control valve 5. After the first control valve 5 is opened, air flow enters the filter 6 under the action of the negative pressure, and sampling starts.

[0047] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the present application.

Claims

1. An aerosol sampling device with high spatio-temporal resolution, characterized in that: The sampling unit comprises at least one sampling unit; The sampling unit comprises an independent power supply (1), an inductor (2), a time-delay controller (3) and an executor (4) electrically connected with the independent power supply (1) respectively, and a first control valve (5), a second control valve (8), a filter (6) and a vacuum container (7); The inductor (2) is electrically connected with the time-delay controller (3) and is used for collecting an aerosol generation signal and transmitting the aerosol generation signal to the time-delay controller (3); The time-delay controller (3) is electrically connected with the executor (4) and is used for receiving the aerosol generation signal and sending a control signal to the executor (4) according to a preset time delay; The executor (4) is connected with the first control valve (5) and is used for controlling the first control valve (5) to open according to the control signal sent by the time-delay controller (3); The first control valve (5) is installed at an air inlet of the filter (6) and is used for controlling air intake of the filter (6); An air outlet of the filter (6) is connected with an air inlet of the vacuum container (7), and the filter (6) is used for collecting aerosols; The vacuum container (7) is internally preset with a vacuum and is used for providing power for sampling air suction; The second control valve (8) is installed at a vacuum air outlet of the vacuum container (7) and is used for cutting off an external vacuum pump to extract air in the vacuum container (7); The inductor (2) is a vibration sensor, the independent power supply (1) is a battery, the first control valve (5) is a ball valve, and the executor (4) is a rudder.

2. The aerosol sampling device with high spatio-temporal resolution capability according to claim 1, characterized in that: The sampling unit is not less than two; The sampling units are independent of each other.

3. The aerosol sampling device with high spatio-temporal resolution capability according to claim 2, characterized in that: The ball valve has a diameter of 5mm-20mm.

4. The aerosol sampling device with high spatio-temporal resolution capability according to claim 3, characterized in that: The filter (6) adopts a filter membrane or a cascade impactor.

5. The aerosol sampling device with high spatio-temporal resolution capability according to claim 4, characterized in that: The filter (6) adopts a filter membrane, and the filter membrane has a diameter of 20mm-50mm.

6. The aerosol sampling device with high spatio-temporal resolution capability according to claim 5, characterized in that: The vacuum container (7) has a volume of 0.1L-3L.

7. The aerosol sampling device with high spatio-temporal resolution capability according to claim 6, characterized in that: The second control valve (8) is a needle valve.

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