An air pollution control sampling device

Abstract

This invention belongs to the field of air pollution detection technology, specifically relating to an air pollution control sampling device. It includes a sampling cylinder, a sampling tube connected to the side wall of the sampling cylinder, and a second annular protrusion located inside the sampling tube near the sampling cylinder. A connection area is formed by the boundary line between the sampling cylinder and the sampling tube, with a first mounting groove at the center of the connection area. An anti-backflow component is provided between the first mounting groove and the second annular protrusion, and an air inlet is provided around the periphery of the first mounting groove. A first sealing plug is used to seal the sampling tube. This invention prevents backflow during the sampling process by incorporating an anti-backflow component at the connection between the sampling cylinder and the sampling tube, thus avoiding backflow.

Description

Technical Field

[0001] This invention belongs to the field of air pollution detection technology, specifically relating to an air pollution control sampling device. Background Technology

[0002] Air pollution refers to the phenomenon where the concentration of certain substances in the atmosphere reaches a harmful level, thereby damaging the ecosystem and the conditions for normal human survival and development, and causing harm to people or things. Currently, rapid economic development has led to increasing environmental pressure, and air pollution in many areas is very serious. In the prevention and control of air pollution, it is necessary to collect air samples. Atmospheric sampling equipment is an instrument or device for collecting air pollutants or polluted air. Existing sampling tube sampling devices lack a dedicated backflow prevention structure at the air inlet. During sampling, the chamber is under negative pressure. If there are instantaneous fluctuations in the external air pressure (such as outdoor gusts or sudden changes in ambient air pressure), irregular inflow of outside air can occur, or even backflow, disrupting the sampling rhythm. After sampling, if the sealing structure is not tight, the gas to be tested collected inside the chamber is prone to leakage. At the same time, outside air will backflow into the sampling chamber, mixing with the sample inside and destroying the original concentration and composition of the sample. Especially for low-concentration pollutants, the backflowing air will directly dilute the sample, leading to significant errors in subsequent detection results and failing to reflect the true state of air pollution. Therefore, an improved air pollution control sampling device has been designed. Summary of the Invention

[0003] In view of the above-mentioned shortcomings in the prior art, the present invention provides an atmospheric pollution control sampling device to solve the problems in the background art.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An air pollution control sampling device includes a sampling cylinder, a sampling tube connected to the side wall of the sampling cylinder, and a second annular protrusion provided inside the sampling tube near the sampling cylinder. The boundary line connecting the sampling cylinder and the sampling tube forms a connection area. A first mounting groove is provided in the center of the connection area. An anti-backflow component is provided between the first mounting groove and the second annular boss. An air inlet is provided around the periphery of the first mounting groove. The first sealing plug is used to seal the sampling tube.

[0005] Furthermore, one end of the sampling tube is connected to a tube base, and the other end is connected to a tube cover. A piston is movably installed inside the sampling tube, and the piston is connected to a push-pull rod.

[0006] Furthermore, a first annular boss is provided inside the sampling cylinder below the first mounting groove, and the inner diameter of the first annular boss is smaller than the outer diameter of the piston.

[0007] Furthermore, a notch is provided at the center of the top of the cylinder cover, and a second rubber stopper is installed on the notch.

[0008] Furthermore, the sampling tube is tubular, and a first rubber stopper is connected to the top of the sampling tube.

[0009] Furthermore, the anti-backflow component includes; An elastic diaphragm is mounted on a first mounting groove, and one side of the elastic diaphragm communicates with the interior of the sampling cylinder; The second sealing plug has its edge connected to the outer wall of the sampling cylinder via multiple reset springs, and its center is connected to an elastic diaphragm via a connecting rod. The outer diameter of the second sealing plug is larger than the inner diameter of the second annular boss.

[0010] Furthermore, there are multiple air intake notches, which are symmetrically distributed around the periphery of the first mounting groove.

[0011] Furthermore, an air outlet is connected to the air inlet notch, and the air outlet direction is parallel to the elastic diaphragm.

[0012] Furthermore, the cross-sectional shape of the air outlet is arc-shaped, and the air outlet end of the air outlet is narrowed.

[0013] Furthermore, the anti-backflow component also includes; A chute, wherein the chute is disposed on the inner wall of the sampling tube; The slider is slidably disposed in the groove and is fixedly connected to the second sealing plug.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The air pollution control sampling device of this application includes a sampling cylinder and a sampling tube. The sampling tube is installed on the side wall of the sampling cylinder and communicates with the sampling cylinder. During sampling, air enters from the air inlet end of the sampling tube, flows along the sampling tube into the sampling cylinder, and a first sealing plug is threadedly connected to the sampling tube to achieve a seal for the sampling device. To prevent backflow during the sampling process, an anti-backflow component is provided at the connection between the sampling cylinder and the sampling tube. To increase and stabilize the pressure difference between the inside and outside of the elastic diaphragm, this application cleverly designs an air inlet on the sampling cylinder, with an outlet connected to the inlet. External sampling air enters through the inlet and exits through the outlet. Specifically, the outlet direction is parallel to the elastic diaphragm. This ensures that the airflow enters the sampling cylinder parallel to the elastic diaphragm, further reducing the pressure in the area near the diaphragm. This further increases the pressure difference between the inside and outside of the diaphragm while maintaining stable deformation of the diaphragm, allowing the sampling air to enter the sampling cylinder smoothly and preventing backflow. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of an embodiment of an air pollution control sampling device according to the present invention; Figure 2 This is a schematic diagram of the internal structure of an air pollution control sampling device according to the present invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 for Figure 3 A magnified view of a section at point B in the middle; The reference numerals in the accompanying drawings include: Sampling tube (100), first rubber stopper (101), first annular boss (102), tube seat (103), piston (104), push-pull rod (105), tube cover (106), second rubber stopper (1061), sampling tube (107), horn cover (108), first sealing plug (109), air inlet (11), first mounting groove (12), elastic diaphragm (201), air outlet (202), reset spring (203), second sealing plug (204), second annular boss (205), slide groove (206), slider (207), connecting rod (208). Detailed Implementation

[0016] To enable those skilled in the art to better understand the present invention, the technical solution of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this application. To better illustrate the embodiments of the present invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0018] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they 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, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0019] In the description of this invention, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating a connection between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] Example 1: like Figure 1-4 As shown, this invention. Specifically, an air pollution control sampling device includes a sampling cylinder 100, a sampling tube 107 connected to the side wall of the sampling cylinder 100, and a second annular protrusion 205 provided inside the sampling tube 107 near the sampling cylinder 100; The boundary line connecting the sampling tube 100 and the sampling pipe 107 forms a connection area. A first mounting groove 12 is provided in the center of the connection area. An anti-backflow component is provided between the first mounting groove 12 and the second annular protrusion 205. An air inlet notch 11 is provided around the first mounting groove 12. The first sealing plug 109 is used to seal the sampling tube 107.

[0021] In this embodiment, the sampling device is used to collect heavily polluted air. The collected polluted air is then used to analyze atmospheric pollution using relevant instruments. Existing sampling devices are prone to backflow during the sampling process, disrupting the sampling rhythm and even affecting subsequent test results. Therefore, improvements have been made by designing an anti-backflow component at the air inlet of the sampling device to prevent backflow during sampling. Specifically, the atmospheric pollution control sampling device of this application includes a sampling cylinder 100 and a sampling tube 107. The sampling tube 107 is located on the side wall of the sampling cylinder 100 and communicates with it. During sampling, air enters from the air inlet of the sampling tube 107, flows along the sampling tube 107 into the sampling cylinder 100, and a first sealing plug 109 is threadedly connected to the sampling tube 107 to seal the sampling device. To prevent backflow during the sampling process, an anti-backflow component is provided at the connection between the sampling cylinder 100 and the sampling tube 107.

[0022] One end of the sampling tube 100 is connected to the tube base 103, and the other end is connected to the tube cover 106. A piston 104 is movably installed inside the sampling tube 100, and the piston 104 is connected to the push-pull rod 105.

[0023] In this embodiment, a piston 104 is provided inside the sampling tube 100. The piston 104 is moved by the push-pull rod 105, which causes a change in the pressure inside the sampling tube 100, thereby facilitating faster collection of polluted air. Specifically, pulling the piston 104 downward causes a negative pressure to be generated in the sampling tube 100. Under the action of the external atmospheric pressure, the polluted air enters the sampling tube 107 more quickly.

[0024] Inside the sampling tube 100, below the first mounting groove 12, there is a first annular boss 102. The inner diameter of the first annular boss 102 is smaller than the outer diameter of the piston 104.

[0025] In this embodiment, since part of the anti-backflow component is located inside the sampling cylinder 100, in order to prevent it from affecting the movement of the piston 104, a first annular boss 102 is provided inside the sampling cylinder 100 to limit the range of motion of the piston 104 to below the anti-backflow component.

[0026] A notch is provided at the center of the top of the cap 106, and a second rubber stopper 1061 is installed on the notch.

[0027] The sampling tube 100 is tubular, and the top of the sampling tube 100 is connected to the first rubber stopper 101.

[0028] In this embodiment, for the convenience of subsequent experimental testing, the top of the sampling tube 100 is sealed by a first rubber stopper 101. To enhance the protection effect, a tube cover 106 is also provided, and a second rubber stopper 1061 is provided at the center of the tube cover 106. During testing, the sample can be taken and transferred by inserting a needle into the second rubber stopper 1061.

[0029] The backflow prevention components include: An elastic diaphragm 201 is installed on the first mounting groove 12, and one side of the elastic diaphragm 201 is connected to the inside of the sampling tube 100. The second sealing plug 204 has its edge connected to the outer wall of the sampling cylinder 100 via multiple reset springs 203. The center of the second sealing plug 204 is connected to the elastic diaphragm 201 via a connecting rod 208. The outer diameter of the second sealing plug 204 is larger than the inner diameter of the second annular boss 205.

[0030] In this embodiment, the anti-backflow component specifically includes an elastic diaphragm 201 made of flexible fluororubber, the edges of which are fixed to the first mounting groove 12 by a pressure ring. It can flexibly deform elastically according to the pressure difference between the inside and outside of the chamber. The edge of the second sealing plug 204 is connected to the outer wall of the sampling cylinder 100 by multiple return springs 203. The center of the second sealing plug 204 is connected to the elastic diaphragm 201 by a connecting rod 208. During the suction process, the pressure inside the sampling cylinder 100 decreases, and a pressure difference exists on both sides of the elastic diaphragm 201, causing the elastic diaphragm 201 to deform and indent towards one side of the sampling cylinder 100. Simultaneously, the deformation drives the second sealing plug 204 to move away from the second annular protrusion 205 via the connecting rod 208, thus... The separation of the second annular protrusion 205 and the second sealing plug 204 creates a gap, forming an airflow channel. Outside air begins to flow in through the gap between the second annular protrusion 205 and the second sealing plug 204, entering the sampling cylinder 100 through the air inlet 11 to achieve the purpose of air collection. As the sampled air continuously enters the sampling cylinder 100, the pressure difference between the inside and outside of the elastic diaphragm 201 reaches equilibrium, and the elastic diaphragm 201 loses pressure. Under the action of the return spring 203, it begins to recover, and the second sealing plug 204 contacts the second annular protrusion 205 again, blocking the second annular protrusion 205. Outside air stops entering, and the sampled air in the sampling cylinder 100 cannot flow out, thus preventing the phenomenon of backflow of sampled air.

[0031] There are multiple air intake notches 11, which are symmetrically distributed around the periphery of the first mounting groove 12. An air outlet 202 is connected to the air intake notch 11, and the air outlet direction of the air outlet 202 is parallel to the elastic diaphragm 201. The cross-sectional shape of the air outlet 202 is arc-shaped, and the air outlet end of the air outlet 202 is narrowed.

[0032] In this embodiment, to increase and stabilize the pressure difference between the inside and outside of the elastic diaphragm 201, a clever design was made for the air inlet 11 on the sampling cylinder 100. An air outlet 202 is connected to the air inlet 11, allowing external sampling air to enter through the air inlet 11 and exit through the air outlet 202. Specifically, the air outlet 202 is parallel to the elastic diaphragm 201. This ensures that the airflow enters the sampling cylinder 100 along a direction parallel to the elastic diaphragm 201, further reducing the pressure in the area near the elastic diaphragm 201. This further increases the pressure difference between the inside and outside of the elastic diaphragm 201 while maintaining stable deformation of the elastic diaphragm 201, allowing the sampling air to smoothly enter the sampling cylinder 100. Figure 3 The cross-sectional shape of the air outlet 202 shown is arc-shaped, and the air outlet of the air outlet 202 tends to narrow. This will increase the airflow velocity from the air outlet 202, further expanding the pressure difference between the inside and outside of the elastic diaphragm 201.

[0033] The backflow prevention components also include; The chute 206 is disposed on the inner wall of the sampling tube 107; The slider 207 is slidably disposed in the groove 206 and is fixedly connected to the second sealing plug 204.

[0034] In this embodiment, to ensure the stability of the movement trajectory of the second sealing plug 204, a guide structure consisting of a groove 206 and a slider 207 is provided. Specifically, the groove 206 is provided on the inner wall of the sampling tube 107, and the slider 207 is slidably disposed in the groove 206 and fixedly connected to the outer wall of the second sealing plug 204.

[0035] The above are merely embodiments of the present invention. The circuits, electronic components, and modules involved are all prior art, fully achievable by those skilled in the art, and require no further explanation. The scope of protection in this application does not involve improvements to the software and methods. Commonly known structures and characteristics in the solutions are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are aware of all prior art in that field, and have the ability to apply conventional experimental methods prior to that date. Those skilled in the art can, under the guidance of this application, improve and implement this solution in combination with their own capabilities. Some typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of the present invention. These should also be considered within the scope of protection of the present invention, and will not affect the effectiveness of the implementation of the present invention or the practicality of the application.

Claims

1. An air pollution control sampling device, characterized in that: Includes a sampling cylinder (100), and a sampling tube (107) is connected to the side wall of the sampling cylinder (100). A second annular boss (205) is provided inside the sampling tube (107) near the sampling cylinder (100). The boundary line connecting the sampling tube (100) and the sampling pipe (107) forms a connection area. A first mounting groove (12) is provided in the center of the connection area. An anti-backflow component is provided between the first mounting groove (12) and the second annular boss (205). An air inlet notch (11) is provided around the first mounting groove (12). The first sealing plug (109) is used to seal the sampling tube (107).

2. The air pollution control sampling device as described in claim 1, characterized in that: One end of the sampling tube (100) is connected to a tube base (103), and the other end is connected to a tube cover (106). A piston (104) is movably installed inside the sampling tube (100), and the piston (104) is connected to a push-pull rod (105).

3. The air pollution control sampling device as described in claim 1, characterized in that: The sampling tube (100) has a first annular boss (102) located below the first mounting groove (12) inside. The inner diameter of the first annular boss (102) is smaller than the outer diameter of the piston (104).

4. The air pollution control sampling device as described in claim 1, characterized in that: The top center of the cap (106) has a notch, and a second rubber stopper (1061) is installed on the notch.

5. The air pollution control sampling device as described in claim 1, characterized in that: The sampling tube (100) is tubular, and the top of the sampling tube (100) is connected to the first rubber stopper (101).

6. The air pollution control sampling device as described in claim 5, characterized in that: The backflow prevention component includes: An elastic diaphragm (201) is installed on a first mounting groove (12), and one side of the elastic diaphragm (201) communicates with the interior of the sampling tube (100); The edge of the second sealing plug (204) is connected to the outer wall of the sampling tube (100) by multiple reset springs (203), and the center of the second sealing plug (204) is connected to the elastic diaphragm (201) by a connecting rod (208). The outer diameter of the second sealing plug (204) is larger than the inner diameter of the second annular boss (205).

7. The air pollution control sampling device as described in claim 6, characterized in that: There are multiple air intake notches (11), and the multiple air intake notches (11) are symmetrically distributed around the first mounting groove (12).

8. The air pollution control sampling device as described in claim 7, characterized in that: An air outlet (202) is connected to the air inlet (11), and the air outlet (202) is parallel to the elastic diaphragm (201) in the air outlet direction.

9. The air pollution control sampling device as described in claim 8, characterized in that: The cross-sectional shape of the air outlet (202) is arc-shaped, and the air outlet end of the air outlet (202) is narrowed.

10. The air pollution control sampling device as described in claim 6, characterized in that: The backflow prevention component also includes; A chute (206) is provided on the inner wall of the sampling tube (107); The slider (207) is slidably disposed in the groove (206) and fixedly connected to the second sealing plug (204).

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