Portable air sampling device

Abstract

The utility model discloses a portable air sampling device, which relates to the technical field of air sampling, and comprises an injector, a sampling tube, a buffer tube and an analysis cup, the injector can be communicated with a sampling environment through the sampling tube, the injector extracts an air sample in the sampling environment through negative pressure, and the buffer tube is communicated with the analysis cup. The injector which collects the air sample can be communicated with the analysis cup through the buffer tube, and absorption liquid is arranged in the analysis cup. The injector is used for collecting gas, can be directly connected with an analysis cup for on-site analysis, can also be taken back to a laboratory for analysis, can be freely selected according to actual working requirements and the state of a sample to be detected, and can be used in different scenes.

Description

Technical Field

[0001] The utility model relates to the technical field of air sampling, in particular to a portable air sampling device. Background Art

[0002] Indoor air quality testing is an emerging industry. It is a technical process of analyzing and testing indoor air pollutants caused by indoor decoration and furniture purchase. It can also be used for environmental sample testing in occupational workplaces. According to the test results, a nationally recognized (CMA) and legally binding test report is issued. Indoor air testing can determine the pollution status of various indoor indicators based on indoor air quality standards and take targeted prevention and control measures. There are many types of indoor air pollutants, mainly physical pollution, chemical pollution, biological pollution, radioactive pollution, etc.

[0003] The existing air sampling method is to use a large volume sampler connected to an absorption tube to collect air samples when detecting low-concentration samples, and to use an air sampling bag to directly collect air samples when the concentration in the ambient air sample is high. However, the above methods have problems such as poor sampling typicality, inability to sample special local locations, large sampling errors in small spaces, and inability to achieve sampling and analytical separation. Utility Model Content

[0004] The purpose of the utility model is to provide a portable air sampling device to solve the problems existing in the above-mentioned prior art, so that the air sampling device is easy to carry and suitable for sampling in a small space, and can directly perform analytical separation.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides a portable air sampling device, comprising a syringe, a sampling tube, a buffer tube and an analytical cup, wherein the syringe can be connected to a sampling environment through the sampling tube, the syringe extracts an air sample in the sampling environment through negative pressure, the syringe that has collected the air sample can be connected to the analytical cup through the buffer tube, and an absorption liquid is arranged in the analytical cup.

[0007] Preferably, the syringe is provided with several capacity models ranging from 100ml to 2000ml.

[0008] Preferably, a cap is movably connected to the air nozzle of the syringe.

[0009] Preferably, the sampling tube is a hollow hose or a stainless steel needle tube.

[0010] Preferably, a filter ball head with a glass sand core is inserted at the end of the sampling tube.

[0011] Preferably, the buffer tube is a glass tube with a diameter of 0.5 mm-2 mm.

[0012] Preferably, the buffer tube is at least 10 cm long, or the buffer tube is arranged in a U shape.

[0013] Preferably, an air inlet and a distribution disk with a glass sand core are provided at the bottom of the analysis cup, the distribution disk is located above the air inlet, and the air inlet is sealed and plugged with the buffer tube.

[0014] Preferably, a rubber stopper is provided on the top of the analytical cup, and an air outlet is provided on the rubber stopper, and the diameter of the air outlet is not greater than the diameter of the air inlet.

[0015] Preferably, the absorption liquid includes methanol, water or carbon disulfide, and the liquid level is at least higher than the height of the uniform distribution plate.

[0016] Compared with the prior art, the utility model has achieved the following technical effects:

[0017] The utility model adopts a syringe to collect gas, which can be directly connected to an analysis cup for on-site analysis, or taken back to the laboratory for analysis. It can be freely selected according to actual work needs and the state of the sample to be tested, and can meet the use of different scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic diagram of the analytical structure of the portable air sampling device in the embodiment of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the air sampling assembly in the embodiment of the utility model;

[0021] In the figure: 1-syringe, 2-buffer tube, 3-analysis cup, 4-cap, 5-stainless steel needle tube, 6-hose, 7-support connecting rod, 8-rubber plug, 9-gas outlet, 10-filter ball head, 11-uniform distribution plate, 12-absorption liquid. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] The utility model aims to provide a portable air sampling device to solve the problems existing in the prior art, so that the air sampling device is easy to carry and suitable for sampling in a small space, and can directly perform analytical separation.

[0024] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0025] like Figure 1 to Figure 2 As shown, a portable air sampling device is provided in this embodiment, including a syringe 1, a sampling tube, a buffer tube 2 and a decomposition cup 3. The syringe 1 can be connected to a sampling environment through the sampling tube. The syringe 1 extracts air samples in the sampling environment through negative pressure. The syringe 1 that has collected the air sample can be connected to the decomposition cup 3 through the buffer tube 2. The decomposition cup 3 is provided with an absorption liquid 12.

[0026] As an optional solution, the syringe 1 in this embodiment is provided with several capacity models of 100ml-2000ml. The syringe 1 in this embodiment is made of glass material, including different specifications of 100ml, 200ml, 500ml, 1000ml, and 2000ml. Sampling syringes of different specifications can be used for environmental samples of different concentrations to achieve accurate sampling of samples with different degrees of pollution. When the concentration of pollutants in the sampled environment is high, a small-specification syringe can be used; when the concentration of pollutants is low, a large-specification syringe is used; the specifications of the sampling syringe are also determined according to the size of the pollution scene to be sampled. For example, a large-specification syringe can be selected for large devices and large spaces, and a small syringe can be selected for small devices and small spaces. Sampling with sampling devices of various specifications pays more attention to the typicality of the sampling site, that is, to discover hazardous factors and effectively identify them.

[0027] As an optional solution, in this embodiment, a cap 4 is movably plugged onto the gas nozzle of the syringe 1, and the syringe 1 is used for gas collection, which can be analyzed on site; when it needs to be taken back to the laboratory for analysis, the cap 4 can be sealed on the gas nozzle and taken back to the laboratory for analysis and then directly tested on the machine. It can be freely selected according to actual work needs and the state of the sample to be tested, and can meet the needs of different scenarios. When the concentration of volatile organic compounds to be tested in the environment is very low, a purge and trap gas chromatograph-mass spectrometer can be used in conjunction with different usage scenarios, or a large-volume sampling pump can be connected for on-site collection. The purge and trap gas chromatograph-mass spectrometer has a lower detection limit than an ordinary gas chromatograph, and even low-content samples to be tested can be accurately qualitatively and quantitatively determined; and the large-volume sampling pump increases the concentration of the analyte in the analytical solution by increasing the sampling volume, thereby achieving effective qualitative and quantitative analysis.

[0028] As an optional solution, the sampling tube in this embodiment is a hollow hose 6 or a stainless steel needle tube 5. The sampling hose 6 can penetrate into some machines or small spaces (such as sewers, ventilation ducts, etc.), and the stainless steel needle tube 5 can penetrate into the wall, puncture stopper bottles or devices for internal sampling, or perform regional sampling at some special locations. It can also be used for the detection of volatile organic compounds (VOCs) in poisoning samples at chemical poisoning sites, and can accurately understand the background of pollutants at local locations.

[0029] As an optional solution, a filter ball head 10 with a glass sand core is inserted at the end of the sampling tube in this embodiment. After using the filter ball head 10, air sampling can be carried out in areas with high dust content and physical interference, and the typicality of the sampling can be ensured, thereby realizing the accurate collection of air samples in local poisoning environments.

[0030] As an optional solution, the buffer tube 2 in this embodiment is a glass tube with a diameter of 0.5mm-2mm, and adopts a capillary glass pipeline form. When collecting samples for analysis, it can reduce the dead volume in the pipeline, increase the airflow pressure, and reduce the flow rate per unit area, thereby improving the analysis efficiency and achieving more accurate quantification. This embodiment adopts a small-volume, flexible, and standardized sampling method, which can achieve accurate analysis of pollutants of specific targets.

[0031] As an optional solution, in this embodiment, the buffer tube 2 is at least 10 cm long; or the buffer tube 2 is arranged in a U shape and a supporting connecting rod 7 is arranged in the middle. The buffer tube 2 is thin and long enough to increase the pipeline gas pressure and reduce the flow rate, thereby further improving the analysis efficiency.

[0032] As an optional solution, in this embodiment, the bottom of the analysis cup 3 is provided with an air inlet and a glass sand core uniform distribution disk 11, the uniform distribution disk 11 is located above the air inlet, the air inlet is sealed and plugged with the buffer tube 2, and a glass sand core is used as the uniform distribution disk 11. When the sampled gas passes through the fine glass buffer tube 2 and then passes through the glass sand core uniform distribution disk 11, a large number of bubbles will be generated, thereby increasing the contact area between the gas and the absorption liquid 12, maximizing the absorption efficiency, and better realizing the analysis of VOC substances in the air sample.

[0033] As an optional solution, in this embodiment, a rubber stopper 8 is provided on the top of the analysis cup 3, and an air outlet 9 is provided on the rubber stopper 8, and the diameter of the air outlet 9 is not greater than the diameter of the air inlet. In this embodiment, the analysis cup 3 is provided with different specifications of 5ml and 10ml, which can be selected according to the actual detection work needs.

[0034] As an optional solution, the absorption liquid 12 in this embodiment includes methanol, water or carbon disulfide, and the liquid level is at least higher than the height of the uniform distribution plate 11, so as to facilitate full contact between gas and liquid and improve the analysis efficiency.

[0035] When the portable air sampling device of this embodiment is used, the syringe 1 can be connected to the sampling environment through the sampling tube. The syringe 1 extracts the air sample in the sampling environment through negative pressure. The syringe 1 can be connected to the analysis cup 3 through the buffer tube 2 to perform on-site analysis, or it can be taken back to the laboratory for analysis. In this embodiment, the sampling tube can be used to connect with three different accessories to form a set of sampling components suitable for different sampling environments; the convenience of the air sampling device is also reflected in two aspects. On the one hand, it is the time and space portability of the sampling and analysis devices. After sampling, the sampling device can be analyzed on-site using the analysis device, or it can be sealed and taken back to the laboratory for analysis, which solves the problems of time and space; on the other hand, it is the portability of the sampling scene. The needle and hose of the sampling part can be switched according to different sampling scenes to ensure the effectiveness of the sampling.

[0036] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A portable air sampling device, characterized in that: It includes a syringe, a sampling tube, a buffer tube and a parsing cup. The syringe can be connected to a sampling environment through the sampling tube. The syringe extracts air samples in the sampling environment through negative pressure. The syringe that has collected the air sample can be connected to the parsing cup through the buffer tube. Absorption liquid is arranged in the parsing cup.

2. The portable air sampling device according to claim 1, characterized in that: The syringe is provided with several capacity models ranging from 100ml to 2000ml.

3. The portable air sampling device according to claim 1, characterized in that: A cover cap is movably plugged onto the gas nozzle of the syringe.

4. The portable air sampling device according to claim 1, characterized in that: The sampling tube is a hollow soft tube or a stainless steel needle tube.

5. The portable air sampling device according to claim 1, characterized in that: The end of the sampling tube is plugged with a filtering ball head with a glass sand core.

6. The portable air sampling device according to claim 1, characterized in that: The buffer tube is a glass tube with a diameter of 0.5 mm to 2 mm.

7. The portable air sampling device according to claim 1, characterized in that: The buffer tube is at least 10 cm long, or the buffer tube is arranged in a U shape.

8. The portable air sampling device according to claim 1, characterized in that: An air inlet and a uniform distribution plate with a glass sand core are arranged at the bottom of the analytical cup. The uniform distribution plate is located above the air inlet. The air inlet is sealed and plugged with the buffer tube.

9. The portable air sampling device according to claim 8, characterized in that: A rubber stopper is arranged on the top of the analytical cup, and an air outlet is opened on the rubber stopper, and the diameter of the air outlet is not greater than the diameter of the air inlet.

10. The portable air sampling device according to claim 8, characterized in that: The absorption liquid includes methanol, water or carbon disulfide, and the liquid level is at least higher than the height of the uniform distribution plate.

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