An exhaust gas sampling system

Abstract

This application provides an exhaust gas sampling system, including a sampling tube, a cooling device, a temperature-regulating sleeve, a first connecting pipe, a vacuum chamber, a second connecting pipe, and a vacuum pump. An air bag is installed inside the vacuum chamber. One end of the sampling tube is located inside an exhaust pipe and passes through the cooling device. The other end of the sampling tube is connected to one end of the first connecting pipe, which in turn communicates with the air bag. A filter is installed inside one end of the first connecting pipe. One end of the second connecting pipe communicates with the inner cavity of the vacuum chamber, and the other end is connected to the vacuum pump. The first connecting pipe passes through the temperature-regulating sleeve, which is used to adjust the temperature of the exhaust gas from the first connecting pipe. This application cools the exhaust gas from the sampling tube using the cooling device and then regulates the temperature of the exhaust gas from the first connecting pipe using the temperature-regulating sleeve, ensuring that the temperature of the regulated exhaust gas output from the first connecting pipe is not excessively high, thus protecting the air bag.

Description

Technical Field

[0001] This application relates to the field of exhaust gas detection technology, and in particular to an exhaust gas sampling system. Background Technology

[0002] With the country placing increasing emphasis on environmental protection, various emission standards for volatile organic compounds have been successively issued, thus necessitating testing of exhaust gases.

[0003] Currently, exhaust gas testing primarily uses the gas bag method. Existing market sampling devices for this method typically introduce exhaust gas directly into the gas bag using a sampling gun. However, excessively high exhaust gas temperatures can damage the gas bag. Utility Model Content

[0004] This application provides an exhaust gas sampling system to solve the problem that excessively high exhaust gas temperatures can easily damage the gas bag.

[0005] To address the aforementioned technical problems, the embodiments of this application disclose the following technical solutions:

[0006] An exhaust gas sampling system includes a sampling tube, a cooling device, a temperature-regulating sleeve, a first connecting tube, a vacuum chamber, a second connecting tube, and a vacuum pump. An air bag is installed inside the vacuum chamber. One end of the sampling tube is used to collect exhaust gas. The sampling tube passes through the cooling device, and the other end of the sampling tube is connected to one end of the first connecting tube. A filter cotton is installed inside one end of the first connecting tube. The first connecting tube passes through the temperature-regulating sleeve, and the other end of the first connecting tube is connected to the air bag. One end of the second connecting tube is connected to the inner cavity of the vacuum chamber, and the other end of the second connecting tube is connected to the vacuum pump.

[0007] Optionally, the cooling device includes a cooling body, the inner wall of which forms a first placement through hole, and the sampling tube is placed in the first placement through hole; the outer wall of the cooling body and the inner wall of the cooling body form a placement cavity, the placement cavity is provided with a cooling medium, the cooling medium is used to cool the waste gas in the sampling tube, the outer wall of the cooling body is provided with an inlet and an outlet, and the inlet and the outlet are both connected to the placement cavity.

[0008] Optionally, the cooling device further includes a circulation pump connected to the inlet and the outlet.

[0009] Optionally, the sampling tube and the connecting tube are connected by a connecting device.

[0010] Optionally, the connecting device is a connecting valve.

[0011] Optionally, the connecting device includes a first flange, a second flange, and bolts. One end of the first flange is connected to the other end of the sampling tube, the other end of the first flange is connected to one end of the second flange by bolts, and one end of the second flange is connected to one end of the connecting tube.

[0012] Optionally, a first connector is provided at the other end of the first connecting tube, and a second connector is provided on the outside of the vacuum box. The second connector is connected to the air bag, and the first connector is connected to the second connector so that the first connecting tube is connected to the air bag.

[0013] The vacuum chamber is provided with a third connector on its exterior, which is connected to the inner cavity of the vacuum chamber. A fourth connector is provided at one end of the second connecting tube, and the third connector is connected to the fourth connector so that the second connecting tube is connected to the inner cavity of the vacuum chamber.

[0014] Optionally, a second storage through hole is formed inside the temperature regulating sleeve, and the connecting pipe is placed in the second storage through hole.

[0015] Optionally, the right view of the first placement through hole is circular, the right view of the sampling tube is circular, and the radius of the first placement through hole is greater than or equal to the radius of the sampling tube.

[0016] Optionally, the sampling tube is a titanium alloy sampling tube.

[0017] Beneficial Effects: This application provides an exhaust gas sampling system, including a sampling tube, a cooling device, a temperature-regulating sleeve, a first connecting tube, a vacuum chamber, a second connecting tube, and a vacuum pump. An air bag is installed inside the vacuum chamber. One end of the sampling tube is placed inside an exhaust pipe to collect exhaust gas from the exhaust pipe. The sampling tube passes through the cooling device, which cools the exhaust gas inside the sampling tube, reducing the temperature of the exhaust gas output from the sampling tube. The other end of the sampling tube is connected to one end of the first connecting tube, which can pass through the temperature-regulating sleeve. The temperature-regulating sleeve regulates the temperature of the exhaust gas inside the first connecting tube, ensuring that the temperature of the regulated exhaust gas meets a preset temperature. The other end of the first connecting tube is connected to the air bag, allowing the regulated exhaust gas to be output from the first connecting tube to the air bag. The exhaust gas in the exhaust pipe is cooled after passing through the sampling tube which passes through the cooling device, and then further regulated by the first connecting tube which passes through the temperature-regulating sleeve before entering the air bag. After cooling by the cooling device and regulating by the temperature-regulating sleeve, the temperature of the regulated exhaust gas output from the first connecting tube will not be too high, protecting the air bag. A filter cotton is installed inside one end of the first connecting pipe to filter particulate matter and clean the exhaust gas. In this application, a cooling device is used to cool the gas and a temperature regulating sleeve is used to regulate the temperature, so that the temperature of the regulated exhaust gas output from the first connecting pipe is not too high, thus protecting the gas bag. Attached Figure Description

[0018] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an exhaust gas sampling system provided in this application;

[0020] Figure 2 A schematic diagram of a cooling device provided in this application;

[0021] Figure 3 This is a partial structural schematic diagram of an exhaust gas sampling system provided in this application;

[0022] Figure Descriptions: 1-Sampling tube, 2-Cooling device, 3-First connecting tube, 4-Temperature regulating sleeve, 5-First connector, 6-Second connector, 7-Gas bag, 8-Vacuum box, 9-Third connector, 10-Fourth connector, 11-Valve, 12-Filter, 13-Air pump, 14-Connecting device, 15-Filter cotton, 16-Second connecting tube, 21-Cooling body, 22-Circulation pump, 211-Placement cavity, 212-First placement through hole, 213-Inlet, 214-Outlet, 41-Second placement through hole, 161-First sub-connecting tube, 162-Second sub-connecting tube, 163-Third sub-connecting tube. Detailed Implementation

[0023] The following description, in conjunction with the accompanying drawings, provides a clear and detailed account of some embodiments of this application. However, the described embodiments are merely some, and not all, of the embodiments described herein. All other embodiments obtained by those skilled in the art based on the embodiments provided herein are within the scope of protection of this application.

[0024] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open and encompassing, meaning "including, but not limited to"; the terms "first" and "second" should not be construed as indicating or implying relative importance or indicating an upper limit on the quantity; the term "connection" should be interpreted broadly, for example, "connection" can be a fixed connection, a detachable connection, or an integral part, and can be a direct connection or an indirect connection through an intermediate medium; descriptions such as "equal to" are not limited to absolute mathematical theoretical relationships, but also include acceptable error ranges arising in practice, as well as differences based on the same design concept but due to manufacturing reasons.

[0025] Figure 1 A schematic diagram of a waste gas sampling system provided for the application. Figure 2A schematic diagram of a cooling device provided for the application. Figure 3 This is a partial structural diagram of an exhaust gas sampling system provided in the application. Figure 1 , Figure 2 and Figure 3 As shown, this application provides an exhaust gas sampling system. This system can be used to collect ultra-high temperature exhaust gases or non-ultra-high temperature exhaust gases. The exhaust gases may include non-methane total hydrocarbons or other components. Ultra-high temperature exhaust gases refer to exhaust gases with a temperature greater than 1000℃, and non-ultra-high temperature exhaust gases refer to exhaust gases with a temperature less than 1000℃.

[0026] In some embodiments, the exhaust gas sampling system may include a sampling tube 1, a cooling device 2, a first connecting pipe 3, a temperature regulating sleeve 4, and a vacuum chamber 8. One end of the sampling tube 1 may be disposed inside an exhaust pipe so that the sampling tube 1 can collect exhaust gas from the exhaust pipe. A gas bag 7 may be disposed inside the cavity of the vacuum chamber 8. The sampling tube 1 may pass through the cooling device 2, which can cool the exhaust gas inside the sampling tube 1, thereby reducing the temperature of the exhaust gas output from the sampling tube 1. The other end of the sampling tube 1 is connected to one end of the first connecting pipe 3, which may pass through the temperature regulating sleeve 4. The temperature regulating sleeve 4 can regulate the temperature of the exhaust gas inside the first connecting pipe 3, so that the temperature of the regulated exhaust gas meets a preset temperature. The preset temperature is approximately 120°C. The other end of the first connecting pipe 3 is connected to the gas bag 7 so that the regulated exhaust gas output from the first connecting pipe 3 is supplied to the gas bag 7. The exhaust gas in the exhaust pipe is cooled after passing through the sampling tube 1 which passes through the cooling device 2, and then regulated by the first connecting pipe 3 which passes through the temperature regulating sleeve 4 before entering the gas bag 7. After cooling by the cooling device 2 and temperature adjustment by the temperature regulating sleeve 4, the temperature of the regulated exhaust gas output from the first connecting pipe 3 will not be too high, which can protect the gas bag 7.

[0027] The material of the air bag 7 can be Teflon, making its temperature resistance range 260℃-300℃. After cooling by the cooling device 2 and adjusting the temperature by the temperature regulating sleeve 4, the temperature of the exhaust gas is about 120℃, which is lower than the temperature resistance of the air bag 7, thus protecting the air bag 7.

[0028] In some embodiments, the exhaust gas sampling system may include a second connecting pipe 16 and a vacuum pump 13. One end of the second connecting pipe 16 is connected to the inner cavity of the vacuum chamber 8, and the other end of the second connecting pipe 16 is connected to the vacuum pump 13, so that the vacuum pump 13 can extract gas from the inner cavity of the vacuum chamber 8. The vacuum pump 13 extracts gas from the inner cavity of the vacuum chamber 8, and the exhaust gas collected by the sampling pipe 1 is cooled by the sampling pipe 1 and adjusted by the first connecting pipe 3 before entering the gas bag 7.

[0029] To sample the exhaust gas inside the exhaust pipe, sampling tube 1 can be made of a high-temperature resistant material, enabling it to collect the exhaust gas. For example, sampling tube 1 can be made of titanium alloy.

[0030] In some embodiments, the cooling device 2 may include a cooling body 21. The inner wall of the cooling body 21 may form a first placement through-hole 212, and the sampling tube 1 may be placed inside the first placement through-hole 212 so that the sampling tube 1 can pass through the cooling body 21. The cooling device 2 can cool the sampling tube 1 so that the temperature of the exhaust gas entering the first connecting pipe 3 is not much different from the preset temperature reached by the temperature regulating sleeve 4, thereby enabling the temperature regulating sleeve 4 to regulate the temperature of the exhaust gas entering the first connecting pipe 3 to the preset temperature.

[0031] The outer wall and inner wall of the cooling body 21 can form a storage cavity 211. A cooling medium can be placed inside the storage cavity 211 to cool the exhaust gas from the sampling tube 1. The cooling medium can be a gas or water.

[0032] The outer wall of the cooling body 21 may be provided with an inlet 213 and an outlet 214. Both the inlet 213 and the outlet 214 are connected to the storage cavity 211 so that the cooling medium can enter the storage cavity 211 through the inlet 213 or the outlet 214.

[0033] The size of the first placement through hole 212 is greater than or equal to the size of the sampling tube 1, so that the sampling tube 1 can be placed inside the first placement through hole 212.

[0034] The shape of the right view of the first storage through hole 212 can be square, rectangle or circle.

[0035] The right view of the first placement through hole 212 is square, the right view of the sampling tube 1 is square, and the side length of the first placement through hole 212 is greater than or equal to the side length of the sampling tube 1.

[0036] The right view of the first placement through hole 212 is rectangular, the right view of the sampling tube 1 is rectangular, the long side of the first placement through hole 212 is greater than or equal to the long side of the sampling tube 1, and the short side of the first placement through hole 212 is greater than or equal to the short side of the sampling tube 1.

[0037] The right view of the first placement through hole 212 is circular, the right view of the sampling tube 1 is circular, and the radius of the first placement through hole 212 is greater than or equal to the radius of the sampling tube 1.

[0038] In some embodiments, the cooling device 2 may include a circulation pump 22. The circulation pump 22 is connected to an inlet 213 and an outlet 214 via connecting pipes so that the cooling medium can move back and forth between the cooling body 21 and the circulation pump 22.

[0039] In some embodiments, one end of the first connecting tube 3 and the other end of the sampling tube 1 can be connected by glue.

[0040] In some embodiments, one end of the first connecting tube 3 and the other end of the sampling tube 1 can be connected by a snap-fit ​​method.

[0041] In some embodiments, one end of the first connecting tube 3 and the other end of the sampling tube 1 can be connected by a connecting device 14. The connecting device 14 can ensure a stable connection between the sampling tube 1 and the first connecting tube 3, while facilitating disassembly and replacement.

[0042] In some embodiments, the connecting device 14 may be a connecting valve.

[0043] In some embodiments, the connecting device 14 includes a first flange, a second flange, and bolts. One end of the first flange is connected to the other end of the sampling tube 1, the other end of the first flange and one end of the second flange are connected by bolts, and one end of the second flange is connected to one end of the first connecting tube 3.

[0044] In some embodiments, a filter cotton 15 may be provided inside one end of the first connecting pipe 3, which can filter particulate matter in the exhaust gas. For example, the filter cotton 15 may be glass wool.

[0045] In some embodiments, a second storage through hole 41 may be formed inside the temperature regulating sleeve 4, and the first connecting pipe 3 is placed in the second storage through hole 41 so that the first connecting pipe 3 can pass through the temperature regulating sleeve 4.

[0046] The size of the second storage through hole 41 is greater than or equal to the size of the first connecting tube 3, so that the first connecting tube 3 can be placed inside the second storage through hole 41.

[0047] The shape of the second storage through hole 41 in the right view can be square, rectangle or circle.

[0048] The right view of the second storage through hole 41 is square, the right view of the first connecting tube 3 is square, and the side length of the second storage through hole 41 is greater than or equal to the side length of the first connecting tube 3.

[0049] The right view of the second storage through hole 41 is rectangular, the right view of the first connecting tube 3 is rectangular, the long side of the first storage through hole 212 is greater than or equal to the long side of the first connecting tube 3, and the short side of the second storage through hole 41 is greater than or equal to the short side of the first connecting tube 3.

[0050] The right view of the second storage through hole 41 is circular, the right view of the first connecting tube 3 is circular, and the radius of the second storage through hole 41 is greater than or equal to the radius of the first connecting tube 3.

[0051] In some embodiments, the other end of the first connecting pipe 3 may be provided with a first connector 5, and the outside of the vacuum box 8 is provided with a second connector 6, which is connected to the gas bag 7. The first connector 5 and the second connector 6 are connected so that the first connecting pipe 3 is connected to the gas bag 7, allowing the exhaust gas in the first connecting pipe 3 to enter the gas bag 7.

[0052] In some embodiments, a third connector 9 may be provided on the outside of the vacuum chamber 8, and the third connector 9 is connected to the inner cavity of the vacuum chamber 8. A fourth connector 10 may be provided at one end of the second connecting pipe 16. The third connector 9 and the fourth connector 10 are connected so that the inner cavity of the vacuum chamber 8 is connected to the vacuum pump 13, so that the vacuum pump 13 can extract gas from the inner cavity of the vacuum chamber 8.

[0053] In some embodiments, the second connecting pipe 16 may include a first sub-connecting pipe 161, a second sub-connecting pipe 162, and a third sub-connecting pipe 163. One end of the first sub-connecting pipe 161 may be provided with a fourth connector 10. The other end of the first sub-connecting pipe 161 and one end of the second sub-connecting pipe 162 may be connected via a valve 11. The other end of the second sub-connecting pipe 162 and the third connecting pipe 163 may be connected via a filter 12. Activated carbon may be provided inside the filter 12 to filter small molecule organic matter.

[0054] This application provides an exhaust gas sampling system, including a sampling tube, a cooling device, a temperature-regulating sleeve, a first connecting pipe, a vacuum chamber, a second connecting pipe, and a vacuum pump. An air bag is installed inside the vacuum chamber. One end of the sampling tube is positioned inside an exhaust pipe to collect exhaust gas from the exhaust pipe. The sampling tube passes through the cooling device, which cools the exhaust gas inside the sampling tube, reducing the temperature of the exhaust gas output from the sampling tube. The other end of the sampling tube is connected to one end of the first connecting pipe, which passes through the temperature-regulating sleeve. The temperature-regulating sleeve regulates the temperature of the exhaust gas inside the first connecting pipe, ensuring that the temperature of the regulated exhaust gas meets a preset temperature. The other end of the first connecting pipe is connected to the air bag, allowing the regulated exhaust gas to be output from the first connecting pipe to the air bag. The exhaust gas in the exhaust pipe is cooled after passing through the sampling tube which passes through the cooling device, and then further regulated by the first connecting pipe which passes through the temperature-regulating sleeve before entering the air bag. After cooling by the cooling device and regulating by the temperature-regulating sleeve, the temperature of the regulated exhaust gas output from the first connecting pipe will not be too high, thus protecting the air bag. A filter cotton is installed inside one end of the first connecting pipe to filter particulate matter and clean the exhaust gas. In this application, a cooling device is used to cool the gas and a temperature regulating sleeve is used to regulate the temperature, so that the temperature of the regulated exhaust gas output from the first connecting pipe is not too high, thus protecting the gas bag.

[0055] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the embodiments described herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not used in this application. The specification and embodiments are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims. It should be understood that this application is not limited to the precise structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A waste gas sampling system, characterized in that, The system includes a sampling tube (1), a cooling device (2), a temperature regulating sleeve (4), a first connecting tube (3), a vacuum box (8), a second connecting tube (16), and a vacuum pump (13). The vacuum box (8) has an air bag (7) inside its cavity. One end of the sampling tube (1) is used to collect waste gas. The sampling tube (1) passes through the cooling device (2). The other end of the sampling tube (1) is connected to one end of the first connecting tube (3). One end of the first connecting tube (3) has a filter cotton (15) inside it. The first connecting tube (3) passes through the temperature regulating sleeve (4). The other end of the first connecting tube (3) is connected to the air bag (7). One end of the second connecting tube (16) is connected to the cavity of the vacuum box (8). The other end of the second connecting tube (16) is connected to the vacuum pump (13).

2. The exhaust gas sampling system according to claim 1, characterized in that, The cooling device (2) includes a cooling body (21), the inner wall of which forms a first storage through hole (212), and the sampling tube (1) is placed in the first storage through hole (212); the outer wall of the cooling body (21) and the inner wall of the cooling body (21) form a storage cavity (211), and a cooling medium is provided in the storage cavity (211) for cooling the waste gas in the sampling tube (1); the outer wall of the cooling body (21) is provided with an inlet (213) and an outlet (214), and the inlet (213) and the outlet (214) are both connected to the storage cavity (211).

3. The exhaust gas sampling system according to claim 2, characterized in that, The cooling device (2) also includes a circulation pump (22) connected to the inlet (213) and the outlet (214).

4. The exhaust gas sampling system according to claim 1, characterized in that, The sampling tube (1) and the connecting tube (3) are connected by a connecting device (14).

5. The exhaust gas sampling system according to claim 4, characterized in that, The connecting device (14) is a connecting valve.

6. The exhaust gas sampling system according to claim 4, characterized in that, The connecting device (14) includes a first flange, a second flange and bolts. One end of the first flange is connected to the other end of the sampling tube (1), and the other end of the first flange is connected to one end of the second flange by bolts. One end of the second flange is connected to one end of the connecting tube (3).

7. The exhaust gas sampling system according to claim 1, characterized in that, The other end of the first connecting pipe (3) is provided with a first connector (5), and the outside of the vacuum box (8) is provided with a second connector (6). The second connector (6) is connected to the air bag (7), and the first connector (5) is connected to the second connector (6) so that the first connecting pipe (3) is connected to the air bag (7). The vacuum chamber (8) is provided with a third connector (9) on its exterior. The third connector (9) is connected to the inner cavity of the vacuum chamber (8). A fourth connector (10) is provided at one end of the second connecting pipe (16). The third connector (9) is connected to the fourth connector (10) so that the second connecting pipe (16) is connected to the inner cavity of the vacuum chamber (8).

8. The exhaust gas sampling system according to claim 1, characterized in that, The temperature regulating sleeve (4) forms a second storage through hole (41), and the first connecting tube (3) is placed in the second storage through hole (41).

9. The exhaust gas sampling system according to claim 2, characterized in that, The right view of the first placement through hole (212) is circular, the right view of the sampling tube (1) is circular, and the radius of the first placement through hole (212) is greater than or equal to the radius of the sampling tube (1).

10. The exhaust gas sampling system according to claim 1, characterized in that, The sampling tube (1) is a titanium alloy sampling tube.

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