Gas trapping pipe
By designing the intake area and fixed area in the gas trap, adsorbing and fixing the gas adsorption material, the problem of additional water removal in the prior art is solved, simplifying the operation and improving the concentration effect of the gas sample and the material life of the material .
Patent Information
- Application Number
- CN202323598999.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-27
- Publication Date
- 2024-12-10
- Estimated Expiration
- 2033-12-27
AI Technical Summary
In the prior art, when using a gas trap tube for air monitoring and sampling, the sample needs to be dewatered first before it can be sent to the gas trap tube for testing, resulting in complex steps and may damage the gas adsorption material.
A gas trap tube is designed, including an intake area and a gas adsorption area. The intake area is filled with glass fiber wool and gas adsorption material to adsorb moisture in the sample and prevent it from entering the gas adsorption area, so that it does not need to be An additional water removal step is provided and the gas adsorption layer and fill layer are fixed through the fixing area and fixing members to prevent it from being blown away under high pressure.
It is realized that air samples are sent into the gas collector for detection without additional water removal, which extends the service life of the gas adsorbent material and improves the concentration effect and concentration magnification of volatile organic compounds.
Smart Images
Figure CN222144631U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to a volatile organic compound (VOCs) detection technology, and more particularly, to a gas capture tube for collecting volatile organic compounds in gas for detection. Background Art
[0002] Studies have found that volatile organic compounds (VOCs) are toxic, teratogenic and carcinogenic. In particular, benzene and toluene can cause great harm to human health. Therefore, the impact of VOCs on human health has gradually attracted people's attention in recent years. One detection method is to pass the collected air samples through a gas capture tube equipped with gas adsorption materials for detection. Among them, the gas adsorption material in the gas capture tube can retain the analyte to be tested (for example: VOC) in the air sample.
[0003] When a gas capture tube is used for air or atmosphere monitoring sampling and concentration in the prior art, the sample needs to be dehydrated before being sent into the gas capture tube. Utility Model Content
[0004] In view of this, the present disclosure proposes a gas capture tube, which can be used to send air samples into the gas capture tube for subsequent experiments without the need for additional water removal from the air samples.
[0005] In a first aspect of the present disclosure, a gas capture tube comprises an inlet end and an outlet end, wherein the inlet end is arranged at one end of the gas capture tube for supplying gas into the gas capture tube, and the outlet end is arranged at the other end of the gas capture tube for discharging gas, and the gas capture tube further comprises: a gas adsorption region, wherein the gas adsorption region comprises at least one gas adsorption layer for adsorbing volatile organic substances in the gas; and an air intake region, wherein the air intake region extends from the inlet end of the gas capture tube to the gas adsorption region, wherein the air intake region is filled with a filling material.
[0006] In another embodiment of the first aspect, the gas adsorption region includes a plurality of gas adsorption layers, a filling layer is provided between adjacent gas adsorption layers, each gas adsorption layer includes a gas adsorption material for adsorbing different volatile organic substances, and the filling layer includes the filling material.
[0007] In another embodiment of the first aspect, the gas capture tube further includes a fixed area, which is arranged on a side of the gas adsorption area close to the outlet end, and the fixed area includes a filling layer and a fixing member, the filling layer is arranged on a side of the fixed area close to the gas adsorption area, and the fixing member is arranged on a side of the fixed area close to the outlet end.
[0008] In another embodiment of the first aspect, the fixing element is in close contact with the filling layer in the fixing area, wherein the filling layer includes a filling material.
[0009] In another embodiment of the first aspect, the filling material includes glass fiber wool and the gas adsorbent material.
[0010] In another embodiment of the first aspect, the length of the tube body of the gas capture tube is 100-200 mm, and the cross-sectional diameter of the tube body is 3-8 mm.
[0011] In another embodiment of the first aspect, the tube body is made of stainless steel or quartz.
[0012] The gas capture tube provided by the utility model can send the air sample into the gas capture tube for subsequent experiments without additional water removal of the air sample. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] In order to understand the features of the present invention described above, a more specific description of the present invention described above can be provided with reference to the embodiments, some of which are illustrated in the accompanying drawings. However, it should be noted that the accompanying drawings only illustrate typical embodiments of the present invention and are therefore not to be considered as limiting the scope of the present invention, as the present invention may admit other equivalent embodiments.
[0014] Figure 1 FIG. 4 is a schematic diagram of the structure of a gas collection tube according to an embodiment of the present disclosure.
[0015] It is to be noted, however, that the appended drawings illustrate only exemplary embodiments of this disclosure and are therefore not to be considered limiting of its scope, for the disclosure may admit to other equally effective embodiments.
[0016] It should be noted that these drawings are intended to illustrate the general characteristics of methods, structures and / or materials used in certain example embodiments and to supplement the written description provided below. However, these drawings are not drawn to scale and may not accurately reflect the precise structural or performance characteristics of any given embodiment, and should not be interpreted as defining or limiting the range of values or characteristics covered by the example embodiments. For example, the relative thicknesses and positions of layers, regions and / or structural elements may be reduced or exaggerated for clarity. The use of similar or identical reference numerals in the various drawings is intended to indicate the presence of similar or identical elements or features. DETAILED DESCRIPTION
[0017] The following description will refer to the accompanying drawings to more fully describe the present disclosure. Illustrated in the accompanying drawings are exemplary embodiments of the present disclosure. However, the present disclosure can be implemented in many different forms and should not be construed as being limited to the exemplary embodiments set forth herein. These exemplary embodiments are provided to make the present disclosure thorough and complete and to fully convey the scope of the present disclosure to those skilled in the art. Similar reference numerals represent identical or similar elements.
[0018] The terms used herein are only used for the purpose of describing specific exemplary embodiments and are not intended to limit the present disclosure. As used herein, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include plural forms. In addition, when used herein, "include" and / or "comprise" or "include" and / or "includes" or "have" and / or "have", integers, steps, operations, elements and / or elements, but do not exclude the presence or addition of one or more other features, regions, integers, steps, operations, elements, elements and / or groups thereof.
[0019] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs. In addition, unless explicitly defined herein, terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant art and the present disclosure, and will not be interpreted as an idealized or overly formal meaning.
[0020] The following is combined with Figure 1 The present invention will be described in detail with reference to the accompanying drawings, wherein the depicted elements are not necessarily shown to scale and the same or similar reference numerals represent the same or similar elements through the several views.
[0021] Figure 1 FIG. 4 is a schematic diagram of the structure of a gas collection tube according to an embodiment of the present disclosure.
[0022] See also Figure 1 The gas collection tube 1 disclosed in the utility model is used to collect volatile organic compounds in air samples. The gas collection tube 1 includes an air intake area 10, a gas adsorption area 11, a fixed area 12, an inlet end 13 and an outlet end 14, wherein the air intake area 10, the gas adsorption area 11 and the fixed area 12 are arranged in sequence, the inlet end 13 is located at the end of the air intake area 10 away from the gas adsorption area 11, and is used to supply gas to enter the gas collection tube, and the outlet end 14 is located at the end of the fixed area 12 away from the gas adsorption area 11, and is used to discharge gas. For example, the gas collection tube 1 includes an adsorption tube or a thermal desorption tube.
[0023] In one embodiment, the length of the tube body of the gas capture tube 1 is 100 mm-200 mm, and the cross-sectional diameter of the tube body of the gas capture tube 1 is 3 mm-8 mm. In one embodiment, the cross-sectional diameter of the tube body of the gas capture tube 1 is 6.35 mm. In one embodiment, the length of the tube body of the gas capture tube 1 can be 105 mm, 110 mm, 115 mm, 120 mm, 125 mm, 130 mm, 135 mm, 140 mm, 145 mm, 150 mm, 155 mm, 160 mm, 165 mm, 170 mm, 175 mm, 180 mm, 185 mm, 190 mm, 195 mm or 200 mm, and the cross-sectional diameter of the tube body of the gas capture tube 1 is 6.35 mm. However, the utility model is not limited thereto. In other embodiments, according to different requirements, the gas capture tube 1 can also be implemented as other tube body lengths and tube body cross-sectional diameters.
[0024] By choosing different lengths and cross-sectional diameters, the gas capture tube can be made more flexible to select different instruments, and the appropriate length and cross-sectional diameter of the gas capture tube can be selected according to the amount of air sample and the analyte to be separated in the air sample (e.g., VOC).
[0025] In one embodiment, the gas collection tube 1 is made of stainless steel or quartz.
[0026] Compared with most gas capture tubes with small inner diameters, the volume of the gas adsorbent material inside the tube diameter is greatly limited, which in turn affects the separation effect of the gas capture tube on volatile organic substances in the sample. Under the same tube cross-sectional diameter, the thickness of the tube wall of most existing gas capture tubes is greater than 0.3 mm. However, in one embodiment of the utility model, the thickness of the tube wall of the gas supplement tube 1 (not shown in the figure) ranges from 0.1 to 0.3 mm. In one embodiment, the gas capture tube 1 adopts an extremely thin-walled tube body design, that is, the outer diameter and the inner diameter of the gas capture tube are almost the same, so the volume of the gas adsorbent material can be increased. Further, the use of a gas capture tube with an increased gas adsorbent volume can improve the concentration effect of volatile organic compounds, that is, a larger amount of gas can be sampled each time, and then the gas sample can be concentrated through the gas supplement tube 1, which is equivalent to increasing the concentration rate of each gas injection.
[0027] The gas adsorption region 11 includes at least one gas adsorption layer for adsorbing volatile organic substances in the gas. In one embodiment, the gas adsorption region 11 includes at least one gas adsorption layer for adsorbing volatile organic substances in the gas. In this embodiment, the gas adsorption region 11 includes three gas adsorption layers 111, 112 and 113 arranged in sequence for adsorbing volatile organic substances in the gas. Further, the gas adsorption region 11 includes gas adsorption layers 111, 112 and 113 separated by the filling layer 101. The gas adsorption layers 111, 112 and 113 separated by the filling layer 101 allow the entire gas adsorption region 11 to further adsorb moisture in the air sample. In addition, the gas adsorption layers 111, 112 and 113 include gas adsorption materials for adsorbing different volatile organic substances.
[0028] In one embodiment, the gas adsorption material includes a gas adsorption material for adsorbing volatile organic substances such as ethane, propane, and butane, ethylene, propylene, butylene, and ethylene-2-butylene, benzene rings such as benzene, toluene, ethylbenzene, and xylene, alcohols such as methanol, ethanol, isopropanol, and isopentanol, aldehydes such as formaldehyde and acetaldehyde, ketones such as acetone, butanone, and formaldehyde cyclohexanone, methyl chloride, chloroform, carbon tetrachloride, 1,2-dichloroethane, 1,2-dichloropropane, trichloroethylene, tetrachloroethylene, 3-chloropropylene, chlorobenzene, sulfides, and organic amines.
[0029] Wherein, the filling layer 101 includes a filling material. In one embodiment, the filling material includes glass fiber wool and a gas adsorption material. It should be noted that the utility model does not limit the number of gas adsorption layers in the gas adsorption area 11. In one embodiment, the gas adsorption area 11 includes at least 2 gas adsorption layers for adsorbing volatile organic substances in the gas, and the gas adsorption layers are separated by filling layers. In another embodiment, the gas adsorption area 11 includes at least 4 gas adsorption layers for adsorbing volatile organic substances in the gas, and the gas adsorption layers are separated by filling layers.
[0030] In one embodiment, the gas capture tube 1 of the utility model can be used in a gas concentration and thermal desorption device. The gas inlet area 10 extends from the inlet end 13 of the gas capture tube 1 to the gas adsorption area 11. The gas inlet area 10 includes a filling layer 101. The gas inlet area 10 is filled with a filling material for adsorbing moisture in the gas. Furthermore, the filling material for adsorbing moisture in the gas absorbs moisture by physical adsorption. In one embodiment, the filling material includes glass fiber wool and a gas adsorption material. When the gas collecting tube 1 is used in the gas concentration and thermal desorption device, the thermal desorption device is used to first cool the gas collecting tube 1 to a negative temperature. At this time, the gas adsorption material has the adsorption characteristics of the gas sample at the negative temperature, and the volatile organic substances are enriched on the gas adsorption material. This is the adsorption process; then the gas concentration and thermal desorption device quickly heats the gas collecting tube 1, and the gas adsorption material has the characteristics of reducing the retention performance of the volatile organic substances at high temperature, so that the volatile organic substances adsorbed on the gas adsorption material are completely desorbed, and the volatile organic substances are directly sent to the gas chromatograph for analysis and determination by the carrier gas. This is the desorption process. In one embodiment, the negative temperature is -50°C to -1°C, and the high temperature is 150°C to 450°C.
[0031] Usually, when air is sampled in places or weather with high humidity, water vapor in the air sample will also enter the traditional gas capture tube. At this time, when the traditional gas capture tube is in the adsorption process of the negative temperature adsorption sample, the water vapor will solidify into ice in the pores of the gas adsorption material. Then, when the traditional gas capture tube is in the desorption process of the high temperature desorption sample, the ice solidified in the gas adsorption material evaporates into water vapor due to heating. Such thermal expansion and contraction process will damage the pores of the gas adsorbent and make the gas adsorption material lose its activity early. Therefore, when using most of the current traditional gas capture tubes, the sample must be dehydrated before use.
[0032] The gas capture tube proposed by the utility model can save the step of removing water from the sample before using the traditional gas capture tube. In one embodiment, the present disclosure designs the gas capture tube 1 to have an air intake area 10 extending from the inlet end 13 of the gas capture tube 1 to the gas adsorption area 11 to adsorb moisture in the sample, thereby preventing moisture from entering the gas capture area 11 and damaging the gas adsorption material. Specifically, the moisture in the sample is first intercepted in the air intake area, so that the moisture solidifies in the air intake area 10 early and does not enter the gas adsorption area 11. The moisture and the gas adsorption material are separated to extend the service life of the gas adsorption material.
[0033] In one embodiment, the fixed area 12 includes a filling layer 101 and a fixing part 15 for fixing the gas adsorption area 11 and the air intake area 10. The filling layer 101 is located on the side of the fixed area 12 close to the gas adsorption area 11, and the fixing part 15 is located at the end of the filling layer 101 away from the gas adsorption area 11. When a high-pressure gas sample is blown in from the inlet end 13, it is easy to cause at least one gas adsorption layer and a filling layer in the gas adsorption area 11, and the filling material in the air intake area 10 to be blown away. The gas adsorption layer includes a gas adsorption material for adsorbing different volatile organic substances. To put it further, the gas adsorption area 11 and the air intake area 10 will move toward the outlet end 14. Therefore, the fixed area 12 and the fixing part 15 can be used to fix the gas adsorption area 11 and the air intake area 10. In this embodiment, the fixing part 15 is a metal coil made of metal material.
[0034] Specifically, see Figure 1 The fixing member 15 is closely attached to the filling layer 101 in the fixing area 12, so as to keep the gas adsorption area 11 in the gas collection tube 1. Specifically, the fixing member 15 extends along the tube wall toward the inlet end 13 and contacts the filling layer 101 in the fixing area 12 in a U-shaped concave manner. The filling layer 101 includes a filling material. In one embodiment, the filling material includes glass fiber wool and a gas adsorption material.
[0035] Compared with the prior art, the gas capture tube provided by the utility model has the feature that the air sample can be sent into the gas capture tube for subsequent experiments without the need for additional water removal of the air sample. In addition, the gas capture tube with an increased volume of gas adsorbent can improve the concentration effect of volatile organic compounds in the air sample, which is equivalent to increasing the concentration ratio of each gas injection. Therefore, the gas capture tube of the utility model is not only simpler to operate, but also can increase the concentration ratio of each gas injection, so as to provide efficient collection of volatile organic compounds in the gas for detection.
[0036] However, the above is only an embodiment of the present utility model, and should not be used to limit the scope of implementation of the present utility model. All simple equivalent changes and modifications made according to the scope of the patent application of the present utility model and the content of the patent specification are still within the scope covered by the present utility model patent.
[0037] Description of Reference Numerals
[0038] 1: Gas collection tube
[0039] 10: Air intake area
[0040] 11: Gas adsorption area
[0041] 12: Fixed area
[0042] 13: Entry
[0043] 14: Exit
[0044] 15: Fixing parts
[0045] 101: Filling Layer
[0046] 111, 112, 113: Gas adsorption layer.
Claims
1. A gas collection tube, characterized in that: It includes an inlet end and an outlet end, wherein the inlet end is arranged at one end of the gas collection pipe for allowing gas to enter the gas collection pipe, and the outlet end is arranged at the other end of the gas collection pipe for discharging gas, and the gas collection pipe further includes: a gas adsorption region, the gas adsorption region comprising at least one gas adsorption layer for adsorbing volatile organic substances in the gas; and An air intake region extends from the inlet end of the gas capture tube to the gas adsorption region, wherein the air intake region is filled with a filling material.
2. The gas collection tube according to claim 1, characterized in that: The gas adsorption region includes a plurality of gas adsorption layers, a filling layer is arranged between adjacent gas adsorption layers, each gas adsorption layer includes a gas adsorption material for adsorbing different volatile organic substances, and the filling layer includes the filling material.
3. The gas collection tube according to claim 1, characterized in that: The gas capture tube also includes a fixed area, which is arranged on a side of the gas adsorption area close to the outlet end. The fixed area includes a filling layer and a fixing member, the filling layer is arranged on a side of the fixed area close to the gas adsorption area, and the fixing member is arranged on a side of the fixed area close to the outlet end.
4. The gas collection tube according to claim 3, characterized in that: The fixing element is in close contact with the filling layer in the fixing area, wherein the filling layer comprises a filling material.
5. The gas collection tube according to claim 2, characterized in that: The filling material includes glass fiber wool and the gas adsorbing material.
6. The gas collection tube according to claim 1, characterized in that: The length of the gas collection tube is 100-200 mm, and the cross-sectional diameter of the tube is 3-8 mm.
7. The gas collection tube according to claim 1, characterized in that: The tube body of the gas collection tube is made of stainless steel or quartz.