Simple sealing device for detecting harmful gas exhaustion rate of solid sample

Abstract

The invention relates to the field of field detection and analysis testing, in particular to a simple sealing device for detecting the harmful gas exhaustion rate of a solid sample. The simple sealing device for detecting the harmful gas exhaustion rate of the solid sample comprises a tank body, a top cover is arranged on the tank body, and a base is arranged below the tank body.

Description

Technical Field The invention relates to the field of on-site detection and analysis testing, and in particular to a simple closed device for detecting the precipitation rate of harmful gases in solid samples. Background Art In people's daily work and life, they will inadvertently come into contact with many harmful gases released by solid substances or artificial synthetic materials. For example, when working in underground tunnels in the field of water conservancy and hydropower, rocks will release radon gas, affecting the ambient air quality of the workplace; in the home improvement industry, formaldehyde and total volatile organic compounds (TVOC) produced by various building materials are constantly endangering human health. Based on the protection of workers directly exposed to harmful gases in workplaces, my country has gradually formulated various detection methods and standards for harmful gases. According to the article "Research on the Formaldehyde Release Law of Wood Artificial Boards" published by Yan Yan et al., the data on the formaldehyde concentration released by artificial boards after 20 days can still fit the first-order exponential model well. At about 75 days, the formaldehyde concentration released by the board basically reaches equilibrium. Therefore, it is shown that the release of harmful gases from solid substances is a slow and long process, and will eventually reach "concentration equilibrium". The precipitation rate of harmful gases from solid substances can reflect the rate and relative content of harmful gases released by a certain solid, and is one of the important parameters for evaluating the harmful gases released by a certain solid. In the process of solid substances releasing harmful gases and tending to equilibrium, higher requirements are placed on the airtightness and stability of the detection equipment. The patent of this invention intends to create a closed environment and place the sample to be tested in the environment to meet the airtightness requirements of the gas detection equipment in the process of detecting the concentration of harmful gases released by solid samples. In order to accurately measure the concentration and rate of harmful gases released by solid samples, a large number of technicians and scientific researchers have conducted research on closed cabins or environmental cabins. For example, a harmful gas detection device (publication number: CN215005281U) avoids direct close contact between workers and harmful gases through a novel structural design, saves manpower, improves the efficiency and effect of detection work, and provides protection and convenience for workers. A gas detection device (publication number: CN215493478U) invention patent, by setting up multiple end-to-end hinged connecting rods, can be folded when not in use, reducing the volume for easy carrying. When air sampling at different heights is required, different heights can be obtained by unfolding the corresponding number of connecting rods, thereby facilitating sampling and detection. In addition, a closed cabin gas detection device (publication number: CN212721932U) covers the outside of the closed cabin with a cover body, and quickly evacuates the air between the cover body and the closed cabin through an exhaust joint connected to the exhaust device. If the closed cabin has a gas leakage problem, the leaked gas inside will gradually flow to the space between the cover body and the cabin due to the air pressure, so that the gas is concentrated, making it easier for the gas detector to detect. While achieving the detection purpose, the device collects and tests harmful gases that overflow from the closed environment, so that the test results are closer to the true value. In summary, the key to accurately measuring harmful gases released by solid samples lies in how to solve the problem of device airtightness. The existing detection equipment has the following problems: ① The current instrument detection equipment or closed cover cannot achieve the sealing of harmful gases, which makes the "harmful gas equilibrium time" in the closed environment shift backward, resulting in inaccurate test data; ② Most of the closed devices or environmental chambers on the market currently have relatively single functions, only targeting a certain type or category of harmful gases (such as formaldehyde, benzene, etc.); ③ If the solid to be tested is a non-columnar or spherical sample (such as square samples, plates, stones, etc.), after placing it in a closed space, the part of the solid sample that contacts the bottom of the closed space cannot release harmful gases well, which will reduce the release of harmful gases to a certain extent and distort the test data; ④ The materials of some closed devices will adsorb some harmful gases. For example, Li Jinyang and Min Jie's study "Research on the Adsorption Behavior of Formaldehyde Gas by Metal-Organic Framework Material MOF-199" shows that metal organic materials will have a certain adsorption effect on formaldehyde. Therefore, when the closed device material adsorbs harmful gases, it will not accurately reflect the concentration of harmful gases released by the solid sample. Summary of the invention In view of the deficiencies of the prior art and equipment, the present invention provides a simple and convenient closed device for detecting the release rate of harmful gases from solid samples, which is easy and convenient to manufacture and can be obtained from a wide range of materials, and solves the problems raised in the above background technology. The present invention is implemented as follows: a simple closed device for detecting the harmful gas precipitation rate of solid samples, which includes a tank body, a top cover is arranged on the tank body, and a base is arranged under the tank body. As described above, a simple closed device for detecting the harmful gas release rate of a solid sample is provided with a bottom protrusion on the base. As described above, a simple closed device for detecting the release rate of harmful gases from solid samples, wherein the bottom protrusion is in the shape of a triangular pyramid, and the angle between the triangular pyramid and the plane of the base is β. A simple closed device for detecting the harmful gas release rate of solid samples as described above, wherein β is 45°-60°. The simple closed device for detecting the harmful gas release rate of a solid sample as described above, wherein an air inlet and an air outlet are arranged on the top cover. In the simple closed device for detecting the harmful gas release rate of a solid sample as described above, the angle between the air inlet and the air outlet and the top cover plane is α. A simple closed device for detecting the harmful gas release rate of solid samples as described above, wherein α is 30°-45°. As described above, a simple closed device for detecting the harmful gas release rate of a solid sample, wherein both the base and the top cover are provided with sealing rings. As described above, a simple closed device for detecting the harmful gas release rate of solid samples has threads on the outer sides of the upper and lower parts of the tank body, which are tightly combined with the threads on the inner diameter of the base and the top cover. As described above, a simple closed device for detecting the harmful gas release rate of a solid sample, wherein the tank body, the top cover and the base are all made of inert material stainless steel.

[0001] The remarkable effect of the present invention is: the present invention provides a simple closed device for detecting the harmful gas precipitation rate of solid samples, which has the following beneficial effects: ① The present invention has a reasonable and compact structure, is easy to operate, and can conveniently realize the detection of the harmful gas precipitation rate of solid samples. ② The entire device body is made of inert material stainless steel, and does not react with common harmful gases during use, thereby ensuring the accuracy of monitoring. ③ During the sample analysis and detection process, the solid to be tested is placed on the triangular pyramid protrusion of the base, and the bottom protrusion of the device base supports the solid to be tested with a very small contact area, so that the sample is basically close to a suspended state in the enclosed space, and the sample can more fully release the harmful gas inside it, so that the final detection result of the harmful gas precipitation rate is more accurate and closer to the true value. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a general connection diagram of a simple closed device for detecting the harmful gas precipitation rate of solid samples; Figure 2 It is a schematic diagram of the top cover; Figure 3 It is a top view of the top cover; Figure 4 It is the front view of the tank; Figure 5 is a schematic diagram of the base; Figure 6 It is a top view of the base; In the figure: 1. base, 2. bottom protrusion, 3. tank body, 4. top cover, 5. air inlet, 6. exhaust hole, 7. bottom sealing ring, 8. top sealing ring. DETAILED DESCRIPTION A simple closed device for detecting the harmful gas precipitation rate of solid samples, the materials used in the device are stainless steel and latex sealing rings. It is composed of a base 1, a bottom protrusion 2, a tank body 3, a top cover 4, an air inlet 5, an exhaust hole 6, a bottom sealing ring 7, and a top sealing ring 8. The main body of the device is made of inert material stainless steel, which does not produce adsorption or physical and chemical reactions with harmful gases commonly seen in daily life. The entire device is supported by the bottom protrusion of the base with a very small contact area to support the solid to be tested, so that the solid to be tested can better release harmful gases, thereby making the measured data closer to the true value. The top cover is provided with an air inlet 5 and an exhaust hole 6, which respectively correspond to the exhaust hole and the air inlet connected to the harmful gas detection instrument. In order to achieve a sealing effect, the base 1 and the top cover 4 are both designed with sealing rings (7, 8) to achieve a good sealing effect. The base 1 is made of stainless steel and has threads on its inner diameter. The inner diameter of the base has a circular bottom sealing ring 6. The base has a bottom protrusion 2. The bottom protrusion 2 and the base 1 are integrally designed and cannot be separated or disassembled. The bottom protrusion 2 is made of stainless steel and has a triangular pyramid shape. It is integrally designed and cast with the base 1 and cannot be disassembled. The angle β between the triangular pyramid of the bottom protrusion 2 and the plane of the base 1 is 45°-60°. The tank body 3 is made of cylindrical stainless steel, and the outer sides of the upper and lower parts of the tank body 3 are both provided with threads, which can be tightly combined with the threads of the inner diameter of the base 1 and the top cover 4. The top cover 4 is made of stainless steel, and has two air holes on the top, an air inlet 5 and an air outlet 6. The two air holes are integral with the top cover 4 and cannot be separated or disassembled. The angle α between the air inlet 5 and the air outlet 6 and the top cover plane is 30°-45°. In the above-mentioned simple sealing device for detecting the harmful gas precipitation rate of solid samples, there is an annular sealing ring 8 on the inner side of the top of the top cover 4, and its main function is to provide sealing when the top cover 4 is connected to the tank body 3 in a threaded form. The use process of the present invention is roughly as follows: A solid sample to be tested of a certain size and volume is selected and placed on the base 1 of the simple closed device, and the tank body 3 is connected to the base 1. Since a sealing ring is provided on the base, the tank body 3 and the base 1 can be tightly combined through the thread and the sealing ring. Then the top cover 4 is connected to the top of the tank body 3. Similarly, a sealing ring is also provided inside the top cover, which can be tightly connected to the tank body 3. This ensures that the entire simple closed device can only exchange gas with the external environment through the air inlet 5 and the exhaust hole 6. In actual operation, the air inlet 5 and the exhaust hole 6 are respectively connected to the exhaust port and the air inlet of the harmful gas detection device. The angle α between the top cover 4 and the air hole (5, 6) is 30°-45°, which ensures that the harmful gas precipitated by the solid sample in the tank body can enter the detector normally, thereby achieving a good gas circulation and accumulation effect inside the device. In addition, the solid sample to be tested is placed on the bottom protrusion 2, and the tip protrusion point in the shape of a triangular cone supports the solid sample to be tested with an extremely small contact area, so that the solid to be tested can fully release harmful gases, ensuring the accuracy and authenticity of the final test data. In the description of the present invention, it should be understood that the terms "concentration balance", "equilibrium time", "solid sample", "base", "bottom protrusion", "tank body", "top cover", "stainless steel material", "air hole", "sealing ring", "gas circulation and accumulation" and the like are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation.

Claims

1. A simple closed device for detecting the release rate of harmful gases from solid samples, characterized in that: It comprises a tank body (3), a top cover (4) is arranged on the tank body (3), and a base (1) is arranged under the tank body (3).

2. A simple closed device for detecting the release rate of harmful gases from solid samples as claimed in claim 1, characterized in that: A bottom protrusion (2) is arranged on the base (1).

3. A simple closed device for detecting the release rate of harmful gases from solid samples as claimed in claim 2, characterized in that: The bottom protrusion (2) is in the shape of a triangular pyramid, and the included angle between the triangular pyramid and the plane of the base (1) is β.

4. A simple closed device for detecting the release rate of harmful gases from solid samples as claimed in claim 3, characterized in that: β is 45°-60°.

5. A simple closed device for detecting the release rate of harmful gases from solid samples as claimed in claim 1, characterized in that: An air inlet (5) and an air outlet (6) are provided on the top cover (4).

6. A simple closed device for detecting the release rate of harmful gases from solid samples as claimed in claim 5, characterized in that: The included angle between the air inlet (5) and the air outlet (6) and the top cover plane is α.

7. A simple closed device for detecting the release rate of harmful gases from solid samples as claimed in claim 6, characterized in that: α is 30°-45°.

8. A simple closed device for detecting the release rate of harmful gases from solid samples as claimed in claim 1, characterized in that: The base (1) and the top cover (4) are both provided with sealing rings.

9. A simple closed device for detecting the release rate of harmful gases from solid samples as claimed in claim 8, characterized in that: The outer sides of the upper and lower parts of the tank body (3) are both provided with threads, which are tightly combined with the threads of the inner diameters of the base (1) and the top cover (4).

10. A simple closed device for detecting the release rate of harmful gases from solid samples as claimed in claim 1, characterized in that: The tank body (3), the top cover (4) and the base (1) are all made of inert material stainless steel.

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