Exhaust gas on-site sampling and detection device for annual inspection of household cars

Abstract

The present invention belongs to the technical field of exhaust gas detection, especially an on-site sampling and detection device for annual inspection of exhaust gas of household cars. The following scheme is now proposed, including a detection box and a sampling cylinder. An inner frame is fixedly connected to the inner wall near the upper part of the sampling cylinder, and a first hydraulic cylinder is fixedly connected to the outer wall of the bottom of the inner frame, and an adjustment column is fixedly connected to the outer wall of the bottom of the first hydraulic cylinder. By setting a blower, an inner hollow column and air holes, during the exhaust gas sampling operation, the blower is started, and the blower introduces the external gas into the inner hollow column and then discharges it through the air holes on the inner hollow column. This part of the gas is relatively weak, and the uniformly distributed air flow limits the exhaust gas entering the inside of the diversion pipe, making it impossible to contact the inner wall of the diversion pipe, thereby avoiding the secondary adhesion of the adsorbable particles in the exhaust gas and ensuring that there is no component loss during the transportation of the exhaust gas, and further improving the use value of the on-site sampling and detection device for exhaust gas.

Description

Technical Field

[0001] The present invention relates to the technical field of exhaust gas detection, and particularly to an on-site sampling and detection device for exhaust gas in the annual inspection of household cars. Background Art

[0002] When conducting on-site sampling and detection of exhaust gas in the annual inspection of existing household cars, the exhaust gas is generally collected through the exhaust pipe of the car. The exhaust gas detection mainly focuses on detecting some harmful components in the exhaust gas. During the collection of the exhaust gas, when the exhaust gas is discharged through the exhaust pipe, some harmful components will adhere to the inner wall of the exhaust pipe of the exhaust gas, resulting in deviation of the collected exhaust gas components and affecting the accuracy of the final exhaust gas detection result, thereby reducing the use value of the on-site sampling and detection device for exhaust gas. Summary of the Invention

[0003] The on-site sampling and detection device for exhaust gas in the annual inspection of household cars proposed by the present invention includes a detection box and a sampling cylinder. An inner frame is fixedly connected to the inner wall of the sampling cylinder near the upper part, and a first hydraulic cylinder is fixedly connected to the outer wall of the bottom of the inner frame. A regulating column is fixedly connected to the outer wall of the bottom of the first hydraulic cylinder. Fixing blocks are annularly distributed on the outer wall of the regulating column, and a second hydraulic cylinder is fixedly connected to the outer wall of each fixing block. A pushing plate is fixedly connected to the outer wall of each second hydraulic cylinder. Partition pieces are equidistantly arranged on the outer wall of each pushing plate facing the inner wall of the sampling cylinder. Mounting blocks are annularly distributed on the inner wall of the sampling cylinder, and a third hydraulic cylinder is fixedly connected to the outer wall of each mounting block facing the partition piece. A knocking arc plate is fixedly connected to the outer wall of each third hydraulic cylinder. Knocking blocks are equidistantly arranged on the outer wall of each knocking arc plate facing the partition piece.

[0004] As a further solution of the present invention, an exhaust hole is opened on the outer wall of the top of the detection box, and a purification frame is fixedly connected to the outer wall of the top of the detection box outside the exhaust hole.

[0005] As a further solution of the present invention, purification plates are misaligned and distributed on the inner wall of the purification frame, and drainage arc pieces are fixedly connected to the outer walls of the bottoms of two of the purification plates.

[0006] As a further solution of the present invention, adjustment holes are equidistantly opened on the outer wall of the sampling cylinder near the lower part, and an outer frame is fixedly connected to the outer wall of the sampling cylinder outside each adjustment hole. Connecting springs are equidistantly fixedly connected to the inner wall of each outer frame facing the sampling cylinder, and a sealing plate is fixedly connected to the outer walls of a plurality of connecting springs on the same outer frame.

[0007] As a further solution of the present invention, guide vanes are fixedly connected to the outer walls of the top and bottom of the sealing plate, and fitting pieces are fixedly connected to the outer walls of the sealing plate near the top end and near the bottom end. The fitting pieces are in contact with the inner wall of the adjustment hole.

[0008] As a further solution of the present invention, the outer walls of every two adjacent sealing plates are fixedly connected with the same telescopic sealing sleeve.

[0009] As a further solution of the present invention, an air inlet hole is opened on the outer wall of one side of the detection box, and a flow guide pipe is fixedly connected to the inner wall of the air inlet hole. A connecting pipe is fixedly connected to the outer wall of the flow guide pipe, and an air inlet pipe is fixedly connected to one end of the connecting pipe. A connecting hole is opened on the outer wall of the top of the sampling cylinder, and the air inlet pipe is fixedly connected to the inner wall of the connecting hole.

[0010] As a further solution of the present invention, a hollow inner column is fixedly connected to the inner wall of the flow guide pipe, and air blowing holes are equidistantly opened on the inner wall of the hollow inner column.

[0011] As a further solution of the present invention, a frame is fixedly connected to the outer wall of the flow guide pipe at the upper part, and a blower is fixedly connected to the outer wall of the top of the frame. The air blowing end of the blower is connected to the inside of the hollow inner column through a pipeline.

[0012] As a further solution of the present invention, a pump frame is fixedly connected to the outer wall of the top of the detection box close to the flow guide pipe, and an air extraction pump is fixedly connected to the outer wall of one side of the pump frame. The air extraction end of the air extraction pump is connected to the inside of the flow guide pipe through a pipeline, and the air delivery end of the air extraction pump is connected to the inside of the flow guide pipe close to the detection box through a pipeline.

[0013] The beneficial effects of the present invention are as follows:

[0014] 1. By providing a sampling auxiliary component, during the operation of sampling the exhaust gas of a car, the sampling cylinder is moved to the outside of the exhaust gas pipe, and then the sampling cylinder is pushed so that the sampling auxiliary component moves into the exhaust gas pipe. Then, the second hydraulic cylinder is adjusted to drive the dividing piece on the pushing plate to contact the inner wall of the exhaust pipe. Next, the first hydraulic cylinder is adjusted to drive the adjusting column to move, and the dividing piece on the pushing plate divides some of the exhaust gas components attached to the inner wall of the exhaust pipe. Then, the third hydraulic cylinder is adjusted to drive the knocking block on the knocking arc plate to slightly knock the outer wall of the exhaust gas pipe, so that this part of the exhaust gas components is separated from the inner wall of the exhaust pipe, and then it is sampled and collected through the sampling cylinder, ensuring the integrity of the exhaust gas sampling, and further ensuring the accuracy of the exhaust gas detection result, and improving the use value of the on-site exhaust gas sampling and detection device.

[0015] 2. By setting a sealing component, during the exhaust gas sampling operation, after placing the sampling cylinder outside the exhaust gas pipe, the outer wall of the exhaust pipe squeezes the sealing plate, causing the fitting piece to move on the inner wall of the adjustment hole. Subsequently, the connecting spring is squeezed, and the sealing plate is in close contact with the outer wall of the exhaust gas pipe under the reaction force of the connecting spring, improving the sealing performance between the two. At the same time, the telescopic sealing sleeve is stretched accordingly, isolating the exhaust gas pipe from the external environment, ensuring that no exhaust gas leakage occurs during the exhaust gas collection and sampling process, and further improving the comprehensiveness of exhaust gas sampling and the accuracy of exhaust gas detection results.

[0016] 3. By setting a blower, a hollow inner column, and air holes, during the exhaust gas sampling operation, start the blower. The blower introduces external gas into the hollow inner column and then discharges it through the air holes on the hollow inner column. This part of the gas is relatively weak, and the uniformly distributed airflow restricts the exhaust gas entering the inside of the diversion pipe, preventing it from contacting the inner wall of the diversion pipe. Thus, the situation of secondary adhesion of adsorbable particles in the exhaust gas is avoided, ensuring that no component loss occurs during the transportation of the exhaust gas, and further improving the use value of this on-site exhaust gas sampling and detection device.

[0017] 4. By setting a purification frame, purification plates, and drainage arc pieces, after the exhaust gas is detected by the detection equipment inside the detection box, the exhaust gas is discharged through the exhaust holes on the detection box. During the discharge process, the exhaust gas first contacts the purification plates arranged in a staggered manner inside the purification frame. During the process of passing through the layers of purification plates, the purification plates absorb some harmful components in the exhaust gas. At the same time, during the flow of the exhaust gas, the drainage arc pieces guide it, maximizing the time it stays inside the purification frame, further improving the purification effect, and enhancing the environmental protection performance of this on-site exhaust gas sampling and detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is the overall structural schematic diagram of the on-site exhaust gas sampling and detection device for annual inspection of household cars proposed by the present invention;

[0019] Figure 2 is the front view of the overall structure of the on-site exhaust gas sampling and detection device for annual inspection of household cars proposed by the present invention;

[0020] Figure 3 is the internal structural schematic diagram of the sampling cylinder of the on-site exhaust gas sampling and detection device for annual inspection of household cars proposed by the present invention;

[0021] Figure 4 is the schematic diagram of the sampling auxiliary component of the on-site exhaust gas sampling and detection device for annual inspection of household cars proposed by the present invention;

[0022] Figure 5Schematic diagram of the sealing component of the on-site sampling and detection device for vehicle exhaust gas during the annual inspection of household cars proposed by the present invention;

[0023] Figure 6 Schematic diagram of the purification plate structure of the on-site sampling and detection device for vehicle exhaust gas during the annual inspection of household cars proposed by the present invention;

[0024] Figure 7 Schematic diagram of the internal structure of the diversion pipe of the on-site sampling and detection device for vehicle exhaust gas during the annual inspection of household cars proposed by the present invention.

[0025] In the figure: 1, detection box; 2, purification plate; 3, purification frame; 4, pump bracket; 5, blower; 6, diversion pipe; 7, connecting pipe; 8, intake pipe; 9, sampling cylinder; 10, outer frame; 11, adjustment hole; 12, connecting spring; 13, air extraction pump; 14, frame; 15, inner frame; 16, dividing piece; 17, mounting block; 18, fitting piece; 19, telescopic sealing sleeve; 20, knocking arc plate; 21, first hydraulic cylinder; 22, adjustment column; 23, second hydraulic cylinder; 24, fixed block; 25, pushing plate; 26, knocking block; 27, third hydraulic cylinder; 28, sealing plate; 29, diversion piece; 30, drainage arc piece; 31, inner hollow column; 32, air blowing hole. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0027] Refer to Figures 1-4, An on-site sampling and detection device for vehicle exhaust inspection of household cars, including a detection box 1 and a sampling cylinder 9. An inner frame 15 is fixedly connected to the inner wall near the upper part of the sampling cylinder 9, and a first hydraulic cylinder 21 is fixedly connected to the outer wall of the bottom of the inner frame 15. A regulating column 22 is fixedly connected to the outer wall of the bottom of the first hydraulic cylinder 21. Fixed blocks 24 are annularly distributed on the outer wall of the regulating column 22, and a second hydraulic cylinder 23 is fixedly connected to the outer wall of each fixed block 24. A push plate 25 is fixedly connected to the outer wall of each second hydraulic cylinder 23. Partition plates 16 are equidistantly arranged on the outer wall of each push plate 25 facing the inner wall of the sampling cylinder 9. Installation blocks 17 are annularly distributed on the inner wall of the sampling cylinder 9, and a third hydraulic cylinder 27 is fixedly connected to the outer wall of each installation block 17 facing the partition plate 16. A knocking arc plate 20 is fixedly connected to the outer wall of each third hydraulic cylinder 27. Knocking blocks 26 are equidistantly arranged on the outer wall of each knocking arc plate 20 facing the partition plate 16. By setting a sampling auxiliary component, when performing the sampling operation of car exhaust, the sampling cylinder 9 is moved to the outside of the exhaust pipe, and then the sampling cylinder 9 is pushed so that the sampling auxiliary component moves into the exhaust pipe. Then, the second hydraulic cylinder 23 is adjusted to drive the partition plate 16 on the push plate 25 to contact the inner wall of the exhaust pipe. Next, the first hydraulic cylinder 21 is adjusted to drive the regulating column 22 to move. The partition plate 16 on the push plate 25 divides some of the exhaust components attached to the inner wall of the exhaust pipe. Then, the third hydraulic cylinder 27 is adjusted to drive the knocking block 26 on the knocking arc plate 20 to slightly knock on the outer wall of the exhaust pipe, so that this part of the exhaust components is separated from the inner wall of the exhaust pipe. Thus, it is sampled and collected through the sampling cylinder 9, ensuring the integrity of the exhaust sampling, and further ensuring the accuracy of the exhaust detection result, and improving the use value of this on-site exhaust sampling and detection device.

[0028] Refer to Figure 1 , Figure 2 and Figure 6 , An exhaust hole is opened on the top outer wall of the detection box 1, and a purification frame 3 is fixedly connected to the top outer wall of the detection box 1 outside the exhaust hole. Purification plates 2 are arranged in a staggered manner on the inner wall of the purification frame 3, and drainage arc pieces 30 are fixedly connected to the bottom outer walls of two of the purification plates 2. By setting the purification frame 3, the purification plates 2 and the drainage arc pieces 30, after the exhaust is detected by the detection equipment inside the detection box 1, the exhaust is discharged through the exhaust hole on the detection box 1. During the discharging process, the exhaust first contacts the purification plates 2 arranged in a staggered manner inside the purification frame 3. During the process of passing through the layers of purification plates 2, the purification plates 2 absorb some harmful components in the exhaust. At the same time, during the flowing process of the exhaust, the drainage arc pieces 30 guide it, so that the time it stays inside the purification frame 3 is maximally extended, further improving the purification effect and the environmental protection performance of this on-site exhaust sampling and detection device.

[0029] Refer to Figure 1 , Figure 2, Figure 3 and Figure 5 , the outer wall of the sampling cylinder 9 near the lower part is provided with adjusting holes 11 at equal distances, and an outer frame 10 is fixedly connected to the outer wall of the sampling cylinder 9 on the outer side of each adjusting hole 11. A connecting spring 12 is fixedly connected to the inner wall of each outer frame 10 facing the sampling cylinder 9 at equal distances. The outer walls of a plurality of connecting springs 12 on the same outer frame 10 are fixedly connected to the same sealing plate 28.

[0030] In the present invention, guide vanes 29 are fixedly connected to both the top outer wall and the bottom outer wall of the sealing plate 28, and fitting pieces 18 are fixedly connected to the outer walls of the sealing plate 28 near the top end and near the bottom end. The fitting pieces 18 are in contact with the inner wall of the adjusting hole 11.

[0031] In the present invention, the outer walls of every two adjacent sealing plates 28 are fixedly connected to the same telescopic sealing sleeve 19. By providing a sealing component, during the tail gas sampling operation, after the sampling cylinder 9 is placed outside the tail gas exhaust pipe, the outer wall of the exhaust pipe squeezes the sealing plate 28, causing the fitting piece 18 to move on the inner wall of the adjusting hole 11, and then causing the connecting spring 12 to be squeezed. The sealing plate 28 is in close contact with the outer wall of the tail gas exhaust pipe under the reaction force of the connecting spring 12, improving the sealing performance between the two. At the same time, the telescopic sealing sleeve 19 is stretched accordingly, isolating the tail gas exhaust pipe from the external environment, ensuring that no tail gas leakage occurs during the tail gas collection and sampling process, and further improving the comprehensiveness of tail gas sampling and the accuracy of tail gas detection results.

[0032] Referring to Figure 1 , Figure 2 and Figure 7 , an air inlet hole is opened on one outer wall of the detection box 1, and a guide pipe 6 is fixedly connected to the inner wall of the air inlet hole. A connecting pipe 7 is fixedly connected to the outer wall of the guide pipe 6. One end of the connecting pipe 7 is fixedly connected to an air inlet pipe 8. A connecting hole is opened on the top outer wall of the sampling cylinder 9, and the air inlet pipe 8 is fixedly connected to the inner wall of the connecting hole.

[0033] In the present invention, a hollow inner column 31 is fixedly connected to the inner wall of the guide pipe 6, and air blowing holes 32 are opened on the inner wall of the hollow inner column 31 at equal distances.

[0034] In the present invention, the outer wall of the upper part of the diversion pipe 6 is fixedly connected to a frame 14, and the top outer wall of the frame 14 is fixedly connected to a blower 5. The air blowing end of the blower 5 is connected to the inside of the inner hollow column 31 through a pipe. A pump frame 4 is fixedly connected to the top outer wall of the detection box 1 close to the diversion pipe 6, and an air extraction pump 13 is fixedly connected to one outer wall of the pump frame 4. The air extraction end of the air extraction pump 13 is connected to the inside of the diversion pipe 6 through a pipe, and the air delivery end of the air extraction pump 13 is connected to the inside of the diversion pipe 6 close to the detection box 1. By providing the blower 5, the inner hollow column 31 and the air blowing holes 32, during the operation of tail gas sampling, the blower 5 is started, and the blower 5 introduces the external gas into the inner hollow column 31 and then discharges it through the air blowing holes 32 on the inner hollow column 31. This part of the gas is relatively weak, and the uniformly distributed air flow restricts the tail gas entering the inside of the diversion pipe 6 so that it cannot contact the inner wall of the diversion pipe 6, thereby avoiding the situation of secondary adhesion of the adsorbable particles in the tail gas and ensuring that there is no component loss during the transportation of the tail gas, further improving the use value of the tail gas on-site sampling and detection device.

[0035] During use, when performing the exhaust gas sampling operation, after placing the sampling cylinder 9 outside the exhaust gas pipe, the outer wall of the exhaust pipe squeezes the sealing plate 28, causing the fitting piece 18 to move on the inner wall of the adjustment hole 11. Subsequently, the connecting spring 12 is squeezed. Under the reaction force of the connecting spring 12, the sealing plate 28 is in close contact with the outer wall of the exhaust gas pipe, improving the sealing between the two. At the same time, the telescopic sealing sleeve 19 is stretched accordingly, isolating the exhaust gas pipe from the external environment to ensure that there is no exhaust gas leakage during the exhaust gas collection and sampling process. After the sealing is completed, then push the sampling cylinder 9 to move the sampling auxiliary assembly into the exhaust gas pipe. Subsequently, adjust the second hydraulic cylinder 23 to drive the dividing piece 16 on the push plate 25 to contact the inner wall of the exhaust pipe. Then, adjust the first hydraulic cylinder 21 to drive the adjustment column 22 to move. The dividing piece 16 on the push plate 25 divides some of the exhaust gas components attached to the inner wall of the exhaust pipe. Then, adjust the third hydraulic cylinder 27 to drive the knocking block 26 on the knocking arc plate 20 to slightly knock on the outer wall of the exhaust gas pipe, causing this part of the exhaust gas components to separate from the inner wall of the exhaust pipe. Thus, sample collection is carried out through the sampling cylinder 9 to ensure the integrity of the exhaust gas sampling. During the sampling process, start the blower 5. The blower 5 introduces external gas into the inner hollow column 31 and then discharges it through the air blowing holes 32 on the inner hollow column 31. This part of the gas is relatively weak, and the uniformly distributed airflow restricts the exhaust gas entering the inner part of the diversion pipe 6, preventing it from contacting the inner wall of the diversion pipe 6. Thus, it avoids the secondary adhesion of the adsorbable particles in the exhaust gas and ensures that there is no component loss during the transportation of the exhaust gas. After the exhaust gas is detected by the detection equipment inside the detection box 1, the exhaust gas is discharged through the exhaust holes on the detection box 1. During the discharge process, the exhaust gas first contacts the purification plates 2 arranged in a staggered manner inside the purification frame 3. During the process of the exhaust gas passing through the layers of purification plates 2, the purification plates 2 absorb some of the harmful components in the exhaust gas. At the same time, during the flow of the exhaust gas, the diversion arc piece 30 guides it, maximizing the time it stays inside the purification frame 3 and further improving the purification effect.

[0036] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes should be covered within the protection scope of the present invention.

Claims

1. An on-site sampling and detection device for vehicle exhaust gas in the annual inspection of household cars, comprising a detection box (1) and a sampling cylinder (9), characterized in that, The inner wall of the sampling cylinder (9) near the upper part is fixedly connected with an inner frame (15), and the outer wall of the bottom of the inner frame (15) is fixedly connected with a first hydraulic cylinder (21). The outer wall of the bottom of the first hydraulic cylinder (21) is fixedly connected with an adjusting column (22). Fixed blocks (24) are annularly distributed on the outer wall of the adjusting column (22), and a second hydraulic cylinder (23) is fixedly connected to the outer wall of each fixed block (24). A pushing plate (25) is fixedly connected to the outer wall of each second hydraulic cylinder (23). Partition plates (16) are equidistantly arranged on the outer wall of each pushing plate (25) facing the inner wall of the sampling cylinder (9). Installation blocks (17) are annularly distributed on the inner wall of the sampling cylinder (9), and a third hydraulic cylinder (27) is fixedly connected to the outer wall of each installation block (17) facing the partition plate (16). A knocking arc plate (20) is fixedly connected to the outer wall of each third hydraulic cylinder (27). Knocking blocks (26) are equidistantly arranged on the outer wall of each knocking arc plate (20) facing the partition plate (16). Adjusting holes (11) are equidistantly formed in the outer wall of the sampling cylinder (9) near the lower part, and an outer frame (10) is fixedly connected to the outer wall of the sampling cylinder (9) outside each adjusting hole (11). Connecting springs (12) are equidistantly fixedly connected to the inner wall of each outer frame (10) facing the sampling cylinder (9). A sealing plate (28) is fixedly connected to the outer walls of multiple connecting springs (12) on the same outer frame (10).

2. The on-site exhaust gas sampling and detection device for annual inspection of household cars according to claim 1, wherein An exhaust hole is formed in the outer wall of the top of the detection box (1), and a purification frame (3) is fixedly connected to the outer wall of the top of the detection box (1) outside the exhaust hole.

3. The on-site exhaust gas sampling and detection device for annual inspection of household cars according to claim 2, wherein Purification plates (2) are staggeredly distributed in the inner wall of the purification frame (3), and drainage arc pieces (30) are fixedly connected to the outer walls of the bottoms of two of the purification plates (2).

4. The on-site exhaust gas sampling and detection device for annual inspection of household cars according to claim 1, wherein, Flow guiding pieces (29) are fixedly connected to the outer walls of the top and the bottom of the sealing plate (28), and attaching pieces (18) are fixedly connected to the outer walls of the sealing plate (28) near the top end and near the bottom end. The attaching pieces (18) are in contact with the inner wall of the adjusting hole (11).

5. The on-site exhaust gas sampling and detection device for annual inspection of household cars according to claim 4, characterized in that, The outer walls of every two adjacent sealing plates (28) are fixedly connected with the same telescopic sealing sleeve (19).

6. The on-site exhaust gas sampling and detection device for annual inspection of household cars according to claim 1, characterized in that, An air inlet hole is formed in the outer wall of one side of the detection box (1), and a flow guiding pipe (6) is fixedly connected to the inner wall of the air inlet hole. A connecting pipe (7) is fixedly connected to the outer wall of the flow guiding pipe (6). One end of the connecting pipe (7) is fixedly connected to an air inlet pipe (8). A connecting hole is formed in the outer wall of the top of the sampling cylinder (9), and the air inlet pipe (8) is fixedly connected to the inner wall of the connecting hole.

7. The on-site exhaust gas sampling and detection device for annual inspection of household cars according to claim 6, characterized in that, An inner hollow column (31) is fixedly connected to the inner wall of the flow guiding pipe (6), and air blowing holes (32) are equidistantly formed in the inner wall of the inner hollow column (31).

8. The on-site exhaust gas sampling and detection device for annual inspection of household cars according to claim 7, characterized in that, A machine frame (14) is fixedly connected to the outer wall of the flow guiding pipe (6) at the upper part, and a blower (5) is fixedly connected to the outer wall of the top of the machine frame (14). The air blowing end of the blower (5) is connected to the inside of the inner hollow column (31) through a pipeline.

9. The on-site exhaust gas sampling and detection device for annual inspection of household cars according to claim 8, characterized in that, A pump bracket (4) is fixedly connected to the outer wall of the top of the detection box (1) close to the diversion pipe (6), and an air extraction pump (13) is fixedly connected to one outer wall of the pump bracket (4). The air extraction end of the air extraction pump (13) is connected to the inside of the diversion pipe (6) through a pipeline, and the air delivery end of the air extraction pump (13) is connected to the inside of the diversion pipe (6) close to the detection box (1) through a pipeline.

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