Device for sampling efficiency test in occupational health

Abstract

The utility model discloses a device for testing sampling efficiency in occupational health, which comprises an acrylic box, a sample box and a sample box, wherein the acrylic box is used for simulating gas-state, vapor-state and aerosol-state chemical substance environments with different concentrations and is of a closed structure; the air sampling combination comprises an air sampler and an air sampling pipe communicated with the air sampler, and the air sampling pipe partially penetrates into the acrylic box; the at least two air collectors are connected to the air sampling pipe in series, are used for directly sampling gas, are positioned outside the acrylic box, are detachably arranged and are in a detached state during pretreatment. A feasible device is provided for a sampling efficiency test, the structure is simple, raw materials can be easily obtained, quantitative production can be achieved, and machining is convenient; on-site environments with different concentrations can be simulated, volatile target substances are effectively collected, and the collection efficiency is improved; and gas volatilization is carried out in the acrylic box, so that environmental pollution can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of occupational health technology, specifically, it is a device for sampling efficiency test in occupational health. BACKGROUND

[0002] The standard for determination of chemical substances in the air of workplace of occupational health work is GBZ / T 210.4-2008 "Occupational Health Standard Formulation Guide Part 4: Determination Method of Chemical Substances in the Air of Workplace", which stipulates the principles, basis, development method and requirements for formulating the standard determination method of chemical substances in the air of workplace, and provides reference basis for the establishment of method and index determination in actual occupational health detection work. The chapter of 5.6.6 test of sampling efficiency in the standard stipulates that the sampling efficiency test can be determined by one of the test methods in 5.6.6.1-5.6.6.4, such as "preparing experimental gas or standard gas with high and low two concentrations (preferably 0.5 times and 2 times the allowable concentration), connecting two (or two) air collectors in series, sampling with high and low two sampling flow rates, sampling for three times respectively, and measuring the amount of measured substance in the front and rear air collectors." However, the standard does not specify the container for preparing experimental gas with high and low two concentrations.

[0003] In GBZ / T 210.4-2008 "Occupational Health Standard Formulation Guide Part 4: Determination Method of Chemical Substances in the Air of Workplace", the existing technology of determination method of chemical substances has the following significant problems or deficiencies:

[0004] 1. The container in the gas preparation method is not clear: in 5.6.6.1 gas preparation method, although it is stipulated that experimental gas or standard gas with high and low two concentrations needs to be prepared, and two (or two) air collectors are connected in series for sampling, but the standard does not clearly specify the container for preparing experimental gas with high and low concentrations. This deficiency leads to that in actual operation, experimental personnel may affect the accuracy and stability of gas concentration due to improper selection of container, and then affect the subsequent experimental results and evaluation of sampling efficiency;

[0005] 3. Lack of description of sampling container and environment: in 5.6.6.3 and 5.6.6.4, the standard does not describe or stipulate the sampling container and sampling environment. The material, size, sealing performance and other characteristics of the sampling container, as well as the temperature, humidity, pressure and other conditions of the sampling environment, can have important influence on the sampling efficiency. This deficiency makes the experimental personnel lack clear guidance when selecting and using the sampling container and controlling the sampling environment, which increases the uncertainty and error of the experimental results.

[0006] In summary, due to the deficiencies in the GBZ / T 210.4-2008 standard in terms of container selection, on-site sampling point concentration measurement, and sampling container and environment description, it is difficult to accurately test the sampling efficiency in actual work. These problems limit the effectiveness and accuracy of the standard in practical application, and need to be solved through technical innovation and improvement. Utility model content

[0007] The utility model aims at providing a device for sampling efficiency test in occupational health, thereby solving the problems in the prior art.

[0008] The utility model aims at realizing the following: a device for sampling efficiency test in occupational health, comprising:

[0009] The acrylic box for simulating different concentrations of gaseous, vapor and aerosol chemical substance environment is provided with a closed structure;

[0010] The air sampling combination comprises an air sampler and an air sampling pipe connected with the air sampler, and the air sampling pipe is partially inserted into the acrylic box.

[0011] The air collector for directly sampling gas is arranged outside the acrylic box, and the air collector is detachably arranged and in a detached state during pretreatment.

[0012] Further, the air sampler and the air collector are arranged on the top of the acrylic box, and the top of the acrylic box is provided with a through hole for accommodating the air sampling pipe.

[0013] Further, the acrylic box is provided with an injection hole which can be opened and closed and matched with a syringe.

[0014] Further, the bottom of the acrylic box is provided with a detachable movable bottom plate.

[0015] Further, the aerosol test assembly used when sampling the aerosol chemical substance is further included, and the aerosol test assembly comprises:

[0016] The aerosol generator is arranged outside the acrylic box.

[0017] The flexible aerosol input pipe is connected with the output end of the aerosol generator at one end.

[0018] The built-in fixing frame is arranged in the inner cavity of the acrylic box, and the aerosol input pipe passes through the reserved hole on the acrylic box and is fixedly inserted into the built-in fixing frame.

[0019] The other end of the aerosol input pipe is provided with a release point and arranged in the inner cavity of the acrylic box.

[0020] Further, the built-in fixing frame is a net frame, and the aerosol input pipe is fixedly inserted into the net holes of the built-in fixing frame.

[0021] Further, the release point of the aerosol input pipe is in the center of the inner cavity of the acrylic box.

[0022] Further, the acrylic box is provided with a mounting hole, and a double-sided silica gel coil protector is inserted into the mounting hole, and the double-sided silica gel coil protector is provided with a sealing plug, the double-sided silica gel coil protector is blocked by the sealing plug during the test, and the sealing plug is opened to communicate the inner cavity of the acrylic box with the outside when the test gas in the acrylic box needs to be removed.

[0023] The technical effect of the utility model lies in:

[0024] 1. The sampling efficiency test accuracy and reliability are improved, the acrylic material is used as the sampling container (the acrylic box), the reaction with the acid in the organic solvent desorption liquid or the standard solution is avoided, the test result accuracy is ensured, the standard solution volume diffused into the acrylic box is controlled, the function of simulating different concentration field environment is realized, and reliable test conditions are provided for the sampling efficiency test.

[0025] 2. The test flexibility and adaptability are enhanced, the bottom of the acrylic box is designed to be flexible (the detachable movable bottom plate, the double-sided silica gel coil protector and the sealing plug), the device can adapt to different test requirements, the test flexibility and adaptability are improved, the acrylic box material is easy to obtain, the size can be customized according to different test requirements, the device can be applied to different scale tests, and the adaptability is further enhanced.

[0026] 3. The test operation process is simplified, the device is simple in structure and convenient to operate, the test process is more concise and clear, and the operation difficulty and complexity are reduced. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is the basic form schematic diagram of the utility model.

[0028] Figure 2 is the schematic diagram of embodiment one.

[0029] Figure 3 is the schematic diagram of embodiment two.

[0030] Figure 4 is the schematic diagram of embodiment three.

[0031] Figure 5 is the schematic diagram of embodiment four.

[0032] Explanation of reference numerals in the attached diagram: 1-Air sampler; 2-Air collector; 3-Air sampling tube; 4-Acrylic box; 4a-Base plate; 5-Built-in bracket; 6-Aerosol input tube; 7-Aerosol generator; 8-Double-sided silicone protective coil; 9-Sealing plug. Detailed Implementation

[0033] The following will refer to the appendix in the embodiments of this utility model. Figures 1-5 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] like Figure 1 As shown, an apparatus for sampling efficiency testing in occupational health is proposed, comprising the following basic components:

[0035] Acrylic box 4 is used to simulate environments of gaseous, vaporous and aerosol chemical substances of different concentrations. It is designed as a closed box structure. The size can be determined according to the experimental requirements. For example, acrylic box 4 can be a hollow cube with specifications of 0.6m×0.6m×0.6m or a hollow cube with specifications of 1m×1m×1m. Other sizes are also acceptable. The bottom of acrylic box 4 can be a base plate or a base frame or other structures.

[0036] An air sampling assembly includes an air sampler 1 and an air sampling tube 3 connected to the air sampler 1, the air sampling tube 3 being partially inserted into an acrylic box 4;

[0037] At least two air collectors 2 connected in series with the air sampling tube 3 and located outside the acrylic box 4 are detachably installed and are in a detached state during pretreatment. The types of air collectors 2 include, but are not limited to, activated carbon sampling tubes, silicone tubes, and microporous membranes.

[0038] The air sampler 1 and the air collector 2 are placed on top of the acrylic box 4. The top of the acrylic box 4 is provided with a through hole for the air sampling tube 3 to pass through (the diameter of the through hole can be set according to specific circumstances, and is not limited here; any improvement is within the protection scope of this patent).

[0039] As can be seen from the above scheme, this patent provides a feasible test device for sampling efficiency testing. The device has a simple structure, the raw materials for the device are readily available, it can be mass-produced, and it is easy to process. It can simulate different concentrations of field environment, effectively collect volatile target substances, and improve collection efficiency. Gas volatilization is carried out in an acrylic box, which can reduce environmental pollution.

[0040] The sampling efficiency test procedure is as follows:

[0041] A standard solution of a certain concentration is prepared, and the solution is dispersed into the acrylic box 4 of 0.6m*0.6m*0.6m size. By controlling the volume of the dispersed solution, different contents of the field are simulated. The air sampling tube 3 with two air collectors 2 in series is inserted into the inner cavity of the acrylic box 4 through the hole in the top of the acrylic box 4. The air sampler 1 is started to suck the gas in the acrylic box 4 at a certain rate, so that the gas flow can pass through the two air collectors 2 in sequence, and the air collectors 2 can be adsorbed.

[0042] The device can simulate different concentrations of gaseous, vapor and aerosol chemical environments, and perform air sampling through the air collectors 2 in series to evaluate the sampling efficiency of the air sampler 1. The evaluation method is as follows:

[0043] After the collection is completed, the air collector 2 is removed, and the air collector 2 (activated carbon tube, silica gel tube, etc.) is pretreated. The activated carbon powder inside is taken out and placed in a sample bottle, and desorbed with a desorption solution for 30 minutes. The concentration of the measured substance is detected by a machine (gas chromatograph, liquid chromatograph, etc.) to evaluate the sampling efficiency of the air sampler 1.

[0044] For different chemical sampling conditions, the following four embodiments are proposed.

[0045] Embodiment one

[0046] As shown in Figure 2 , embodiment one is for gaseous and vapor chemical sampling conditions, specifically:

[0047] The above acrylic box 4 is provided with an injection hole which can be opened and closed and cooperates with a syringe. The injection hole can be provided at the top of the acrylic box 4 or any other position.

[0048] The bottom of the acrylic box 4 is provided with a detachable movable bottom plate 4a, which can completely close the bottom of the acrylic box 4 and is convenient to remove for aerosol chemical sampling.

[0049] During the sampling operation, a certain volume of standard solution (standard substance can be experimental gas or standard gas, such as ethylene oxide gas standard substance in nitrogen, and standard solution can be carbon disulfide, methanol, dichloromethane, etc. Desorption liquid prepared standard solution) of known concentration is injected into the acrylic box 4 with a syringe. After the standard solution is volatilized in the acrylic box 4, different content fields are simulated.

[0050] Embodiment two

[0051] As shown in Figure 3 , embodiment two is for aerosol chemical sampling conditions, specifically:

[0052] In this embodiment, the bottom of the acrylic box 4 is provided with a detachable bottom plate 4a, which can be removed during the test. The device also includes an aerosol test assembly used when sampling aerosol chemicals. The aerosol test assembly includes:

[0053] An aerosol generator 7 outside the acrylic box 4;

[0054] A flexible aerosol input tube 6, one end of which is connected to the output end of the aerosol generator 7;

[0055] An internal fixing frame 5 built into the inner cavity of the acrylic box 4, the aerosol input tube 6 passes through the reserved hole on the acrylic box 4 and is fixed and plugged into the internal fixing frame 5.

[0056] Wherein, the other end of the aerosol input tube 6 is provided as a release point and is located in the inner cavity of the acrylic box 4.

[0057] The internal fixing frame 5 is provided as a mesh frame, the aerosol input tube 6 is fixed and plugged into the mesh holes of the internal fixing frame 5, the aerosol input tube 6 is bent upwards so that its outlet end faces upwards, and the release point of the aerosol input tube 6 is located in the center of the inner cavity of the acrylic box 4, so as to facilitate diffusion in the box space.

[0058] In the second embodiment, the internal fixing frame 5 is used to fix the tube of the aerosol generator, and the solution is dispersed to the center of the device to simulate different concentrations of the scene.

[0059] Embodiment three

[0060] As shown in Figure 4 Embodiment three is also aimed at gaseous and vapor chemical sampling conditions, but it is different from embodiment one. Specifically, a mounting hole is provided near the bottom of the side wall of the acrylic box 4 (the specific size and hole position can be unlimited, and this embodiment is exemplified for ease of explanation), and a double-sided silica gel coil protector 8 is inserted into the mounting hole. The double-sided silica gel coil protector 8 has a through hole to communicate the box space with the outside.

[0061] The acrylic box 4 is provided with an injection hole which can be opened and closed in cooperation with a syringe. The injection hole can be provided at the top of the acrylic box 4 or any other position.

[0062] The double-sided silica gel coil protector 8 is provided with a sealing plug 9. During the test, the double-sided silica gel coil protector 8 is plugged by the sealing plug 9, a certain volume of standard solution with known concentration is injected into the acrylic box 4 through the injection hole by the syringe, and different concentrations of the scene are simulated after the standard solution is volatilized. When it is necessary to remove the test gas in the acrylic box 4, the sealing plug 9 is opened to communicate the inner cavity of the acrylic box 4 with the outside, so as to exhaust the internal gas.

[0063] Embodiment four

[0064] As Figure 5 shown, embodiment four is aimed at aerosol chemical sampling condition, embodiment four is same as embodiment two in setting aerosol test assembly, the setting scheme of aerosol test assembly of embodiment four is same as embodiment two.

[0065] The difference mainly lies in: installation hole is formed in the position close to the bottom of the side wall of acrylic box 4 (the specific size and hole opening position can not be limited, and examples are given in the embodiment for the convenience of description), and double-sided silica gel coil protector 8 is inserted in the installation hole, the double-sided silica gel coil protector 8 has a through hole to communicate the space in the box with the outside.

[0066] In embodiment four, aerosol input pipe 6 penetrates into acrylic box 4 through double-sided silica gel coil protector 8. The pipe of the aerosol generator is fixed by the built-in fixing frame 5, and the solution is dispersed to the center of the device to simulate different contents of the scene.

[0067] In the description of the utility model, it needs to be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the utility model; In the utility model, it also needs to be explained that the terms "mounting", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected, or it can be mechanically connected, or it can be indirectly connected through an intermediate connecting part, the specific meaning of the terms in the utility model can be understood according to the specific circumstances.

[0068] It is obvious for those skilled in the art that the utility model is not limited to the details of the above-mentioned exemplary embodiments, and can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the utility model is defined by the appended claims rather than the above description, therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model, and any reference signs in the claims should not be regarded as limiting the involved claims.

[0069] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.

Claims

1. A device for sampling efficiency test in occupational health, characterized in that, The invention relates to a kit for simulating environments of different concentrations of gaseous, vaporous and aerosol chemical substances, comprising: a plexiglass box (4) configured as a closed structure; an air sampling assembly comprising an air sampler (1) and an air sampling tube (3) connected to the air sampler (1), the air sampling tube (3) being partially inserted into the plexiglass box (4); at least two air collectors (2) for direct gas sampling connected in series to the air sampling tube (3), the air collectors (2) being arranged outside the plexiglass box (4) and being detachable and in a detached state during pre-treatment.

2. A device for testing the sampling efficiency in occupational hygiene according to claim 1, characterized in that The air sampler (1) and the air collectors (2) are arranged on the top of the plexiglass box (4), the top of the plexiglass box (4) being provided with a through hole for accommodating the air sampling tube (3).

3. A device for testing the sampling efficiency in occupational health according to claim 1, characterized in that, The plexiglass box (4) is provided with an injection hole which can be opened and closed and is matched with a syringe.

4. A device for testing the sampling efficiency in occupational health according to claim 1, characterized in that, The bottom of the plexiglass box (4) is provided with a detachable bottom plate (4a).

5. A device for testing the sampling efficiency in occupational health according to claim 1, characterized in that, The invention further relates to an aerosol test assembly used when sampling aerosol chemical substances, the aerosol test assembly comprising: an aerosol generator (7) arranged outside the plexiglass box (4); a flexible aerosol input tube (6) having one end connected to the output end of the aerosol generator (7); an internal fixing frame (5) arranged in the inner cavity of the plexiglass box (4), the aerosol input tube (6) passing through a reserved hole on the plexiglass box (4) and being fixedly inserted into the internal fixing frame (5); wherein the other end of the aerosol input tube (6) is configured as a release point and is arranged in the inner cavity of the plexiglass box (4).

6. A device for testing the sampling efficiency in occupational hygiene according to claim 5, characterized in that The internal fixing frame (5) is configured as a mesh frame, and the mesh holes of the internal fixing frame (5) are fixedly inserted into the aerosol input tube (6).

7. A device for testing the sampling efficiency in occupational health according to claim 5, characterized in that The release point of the aerosol input tube (6) is arranged at the center of the inner cavity of the plexiglass box (4).

8. A device for testing the sampling efficiency in occupational health according to claim 1, characterized in that The plexiglass box (4) is provided with a mounting hole, and a double-sided silica gel coil protector (8) is inserted into the mounting hole, the double-sided silica gel coil protector (8) being provided with a sealing plug (9), the double-sided silica gel coil protector (8) being blocked by the sealing plug (9) during the test, and the sealing plug (9) being opened to connect the inner cavity of the plexiglass box (4) with the outside when it is necessary to remove the test gas in the plexiglass box (4).

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