A device for sampling volatile organic compounds from exhaust gas

Abstract

The application belongs to the technical field of sampling devices and discloses a waste gas volatile organic compound sampling device, which comprises a mobile trolley, a collection box is fixed on the mobile trolley, a collection hose fixed with the collection box is arranged through the collection box, the upper end of the collection hose penetrates through the top of the collection box and is slidably connected, a plurality of sliding grooves are formed in the inner wall of the collection box, a sliding block is slidably connected in the sliding groove, a limiting column is rotatably connected to the sliding block, a spring is fixed between the sliding block and the sliding groove, the number of the sliding grooves, the number of the sliding blocks, the number of the limiting columns and the number of the springs are equal and one-to-one corresponding, the collection hose passes through the sidewalls of the plurality of limiting columns in sequence, the upper end of the collection hose is rotatably connected with a collection head, and a collection mechanism is arranged on the collection box. The arrangement of the sliding block, the limiting column and the spring avoids the situation that the collection hose falls off when the device moves, and facilitates the use of the device.

Description

Technical Field

[0001] This utility model relates to the field of sampling device technology, and in particular to a sampling device for volatile organic compounds in waste gas. Background Technology

[0002] Volatile organic compounds are commonly referred to as VOCs. Most VOCs have an unpleasant odor and are toxic, irritating, teratogenic, and carcinogenic. In particular, benzene, toluene, and formaldehyde can cause great harm to human health.

[0003] Chinese utility model patent CN221976561U discloses a vacuum sampling device for volatile organic compounds in waste gas, including a vacuum chamber. A gas guide pipe is connected through the interior of the vacuum chamber. A gas distribution pipe is connected to the surface of the gas guide pipe. An air inlet pipe is threaded to the end of the gas distribution pipe. An air bag is provided at the end of the air inlet pipe. A hook is provided at the top of the air bag. A support rod is provided inside the vacuum chamber. A hose is connected to the end of the gas guide pipe. A sampling gun is provided at the end of the hose. A fixing rod is provided on the side of the vacuum chamber.

[0004] The existing technology has two main drawbacks. First, because the hose is directly wrapped around the fixing rod, the hose may fall off the fixing rod when the ground is bumpy. Second, the hose needs to be removed from the fixing rod or wrapped around the fixing rod each time it is used, which is inconvenient. Utility Model Content

[0005] To address the aforementioned problems, this invention provides a sampling device for volatile organic compounds in waste gas.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a sampling device for volatile organic compounds in exhaust gas, comprising a mobile cart, a collection box fixed on the mobile cart, a collection hose fixed to the collection box and passing through the collection box, the upper end of the collection hose passing through the top of the collection box and slidingly engaged, multiple grooves being formed on the inner wall of the collection box, sliders slidingly engaged in the grooves, limit posts being rotatably connected to the sliders, and springs being fixed between the sliders and the grooves, the number of grooves, the number of sliders, the number of limit posts, and the number of springs being equal and their positions corresponding one-to-one, the collection hose sequentially passing over the side walls of the multiple limit posts, the upper end of the collection hose rotating and connected to a collection head, and the collection box being provided with a collection mechanism for drawing volatile organic gases from the outside into the collection hose from the collection head and collecting them.

[0007] By employing the above technical solution, the operator pulls the collection head upwards, causing the collection hose to move. This moves the limiting posts connected to the collection hose and the slider connected to the limiting posts, gradually reducing the distance between adjacent limiting posts. The spring gradually contracts under pressure. The length of the collection hose pulled out is determined based on the height of the desired gas collection location, and gas collection can then be performed in conjunction with the collection mechanism. After collection, the collection head is moved downwards, causing the spring to gradually extend and return to its original position. This causes the slider connected to the spring and the slider connected to the slider to return to their original positions, gradually increasing the distance between adjacent limiting posts. The upper end of the collection hose is then pulled into the collection hose until the bottom of the collection head is flush against the top of the collection box, preventing the collection hose from detaching during device movement and facilitating the use of the device.

[0008] Furthermore, the collection mechanism includes an air extraction assembly, which includes an air pump fixed to the collection box, a gas distribution box fixed and connected to the air outlet of the air pump, and a plurality of exhaust pipes fixed and connected to the gas distribution box. The collection hose is fixed and connected to the air inlet of the air pump. The collection mechanism also includes a collection component for collecting the gas discharged into the gas distribution box.

[0009] By adopting the above technical solution, after the air pump is working, the outside gas first enters the air pump through the collection head, collection hose and air pump inlet in sequence, then is discharged into the gas distribution box through the air pump outlet, and finally is collected by the collection component to ensure the gas collection of the device.

[0010] Furthermore, the collection assembly includes multiple collection bags placed on a mobile trolley, a gas delivery hose fixed and connected to the collection bags, and a connecting sleeve rotatably installed at the end of the gas delivery hose away from the collection bags. The connecting sleeve is connected to the gas delivery hose and threadedly connected to the exhaust pipe. Both the gas delivery hose and the gas distribution box are equipped with a switch valve.

[0011] By adopting the above technical solution, the gas in the gas distribution box first enters the connecting sleeve through the exhaust pipe, then enters the gas delivery hose through the connecting sleeve, and finally enters the collection bag through the gas delivery hose for collection. After the gas delivery hose has finished collecting, the switch valve on the gas delivery hose and the gas distribution box is closed. Then the connecting sleeve is separated from the exhaust pipe, and other empty collection bags can be replaced so that the device can continue to collect.

[0012] Furthermore, the mobile trolley is fixed with a limiting shell for placing the collection bag. The top of the limiting shell is provided with a limiting through hole extending to the side of the limiting shell away from the air pump. The air supply hose passes through the limiting through hole. The number of limiting shells, the number of limiting through holes and the number of air supply hoses are all equal and their positions correspond one-to-one.

[0013] By adopting the above technical solution, the setting of the limiting shell and the limiting through hole improves the stability of the collection bag during collection.

[0014] Furthermore, the collection head is internally threaded with a filter plate.

[0015] By adopting the above technical solution, the filter plate can filter dust in the gas.

[0016] Furthermore, a limiting sleeve is fixed to the top of the acquisition box for the acquisition head to pass through. An L-shaped limiting slot is provided through the limiting sleeve. The vertical section of the limiting slot extends to the top of the limiting sleeve. A handle is fixed to the acquisition head and engages with the horizontal section of the limiting slot.

[0017] By adopting the above technical solution, the sampling head is rotated and the handle is driven until the handle can no longer move. At this point, the sampling head can be pulled upwards to perform the sampling operation. The setting of the limiting sleeve, limiting slot and handle improves the stability of the sampling head when the device moves.

[0018] Furthermore, a pulley is fitted on the limiting post, and the collection hose fits into the groove on the pulley. The number of pulleys is equal to the number of limiting posts, and their positions correspond one-to-one.

[0019] By adopting the above technical solution and setting up the pulley, the probability of slippage during the movement of the data collection hose is reduced.

[0020] Furthermore, a sliding rod is fixed inside the groove, the sliding rod passes through the slider and slides in engagement with it, the number of the sliding rods is equal to the number of sliders and their positions correspond one-to-one.

[0021] By adopting the above technical solution, the design of the slider improves the stability of the slider movement.

[0022] In summary, the present invention has the following beneficial effects: the slider, the limiting post and the spring in this application prevent the collection hose from falling off when the device moves, and also facilitate the use of the device. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model;

[0024] Figure 2 This is a cross-sectional schematic diagram of an embodiment of the present invention to highlight the connection structure between the exhaust pipe and the connecting sleeve;

[0025] Figure 3 This is a cross-sectional schematic diagram of an embodiment of the present invention used to highlight the internal structure of the collection box;

[0026] Figure 4This is a cross-sectional schematic diagram of an embodiment of the present invention to highlight the connection structure between the slider and the spring.

[0027] In the diagram: 1. Collection box; 2. Collection hose; 3. Slide groove; 4. Slider; 5. Limiting post; 6. Spring; 7. Collection head; 8. Collection mechanism; 81. Air extraction assembly; 811. Air pump; 812. Air distribution box; 813. Exhaust pipe; 82. Collection assembly; 821. Collection bag; 822. Air delivery hose; 823. Connecting sleeve; 9. Limiting shell; 10. Limiting through hole; 11. Filter plate; 12. Limiting sleeve; 13. Limiting slot; 14. Handle; 15. Pulley; 16. Slide rod. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0029] like Figure 1-4 As shown in the figure, this application discloses a sampling device for volatile organic compounds in exhaust gas, including a mobile cart, a sampling box 1, a sampling hose 2, and a collection mechanism 8. The sampling box 1 is fixed on the mobile cart. The sampling hose 2 is disposed inside the sampling box 1, with its lower end penetrating through the sampling box 1 and fixed, and its upper end penetrating through the top of the sampling box 1 and slidingly engaged. Multiple sliding grooves 3 are provided on the inner wall of the sampling box 1, and sliders 4 are slidably engaged in the sliding grooves 3. Limiting posts 5 are rotatably connected to the sliders 4, and springs 6 are fixed between the sliders 4 and the sliding grooves 3. The number of sliding grooves 3, the number of sliders 4, the number of limiting posts 5, and the number of springs 6 are all equal and their positions correspond one-to-one. The sampling hose 2 passes sequentially around the side walls of the multiple limiting posts 5, and its upper end rotates and is connected to a sampling head 7. The operator pulls the collection head 7 upwards, causing the collection hose 2 to move. This moves the limiting post 5 connected to the collection hose 2 and the slider 4 connected to the limiting post 5. The distance between two adjacent limiting posts 5 gradually decreases, and the spring 6 gradually contracts under pressure. The length of the collection hose 2 pulled out is determined according to the height of the gas collection location, and gas collection can be performed in conjunction with the collection mechanism 8. After collection, the collection head 7 is moved downwards, and the spring 6 gradually extends and returns to its original position. This causes the slider 4 connected to the spring 6 and the slider 4 connected to the slider 4 to return to their original position. The distance between two adjacent limiting posts 5 gradually increases, and the upper end of the collection hose 2 is pulled into the collection hose 2 until the bottom of the collection head 7 is flush with the top of the collection box 1. This prevents the collection hose 2 from falling off during device movement and also facilitates the use of the device.

[0030] A collection mechanism 8 is mounted on the collection box 1. The collection mechanism 8 is used to draw volatile organic gases from the outside into the collection hose 2 through the collection head 7 and collect them. The collection mechanism 8 includes a suction assembly 81 and a collection assembly 82. The suction assembly 81 includes an air pump 811, a gas distribution box 812, and exhaust pipes 813. The air pump 811 is fixed to the collection box 1. The gas distribution box 812 is fixed and connected to the outlet end of the air pump 811, and multiple exhaust pipes 813 are fixed and connected to the gas distribution box 812. Multiple exhaust pipes 813 are provided. The collection hose 2 is fixed and connected to the inlet end of the air pump 811. After the air pump 811 starts working, the outside gas first enters the air pump 811 sequentially through the collection head 7, the collection hose 2, and the inlet end of the air pump 811. Then, it is discharged from the outlet end of the air pump 811 into the gas distribution box 812, and finally collected by the collection assembly 82 to ensure the gas collection function of the device.

[0031] The collection assembly 82 is used to collect the gas discharged into the gas distribution box 812. The collection assembly 82 includes a collection bag 821, a gas delivery hose 822, and a connecting sleeve 823. Multiple collection bags 821 are placed on a mobile trolley. The gas delivery hose 822 is fixed and connected to the collection bag 821. The connecting sleeve 823 is rotatably installed at the end of the gas delivery hose 822 away from the collection bag 821. The connecting sleeve 823 communicates with the gas delivery hose 822 and is threadedly connected to the exhaust pipe 813. Both the gas delivery hose 822 and the gas distribution box 812 are equipped with on / off valves. The gas in the gas distribution box 812 first enters the connecting sleeve 823 through the exhaust pipe 813, then enters the gas delivery hose 822 through the connecting sleeve 823, and finally enters the collection bag 821 through the gas delivery hose 822 for collection. After the gas delivery hose 822 has finished collecting, the switch valve on the gas delivery hose 822 and the gas distribution box 812 is closed. Then the connecting sleeve 823 is separated from the exhaust pipe 813, and other empty collection bags 821 can be replaced to allow the device to collect continuously.

[0032] A limiting shell 9 is fixed on the mobile trolley for placing the collection bag 821. A limiting through hole 10 is provided through the top of the limiting shell 9, extending to the side of the limiting shell 9 away from the air pump 811. The air supply hose 822 passes through the limiting through hole 10. The number of limiting shells 9, the number of limiting through holes 10, and the number of air supply hoses 822 are all equal and their positions correspond one-to-one. The setting of the limiting shells 9 and the limiting through holes 10 improves the stability of the collection bag 821 during collection.

[0033] The sampling head 7 is internally threaded with a filter plate 11, on which a sponge is fixed. Multiple through holes are provided in the sponge. The filter plate 11 can filter dust in the gas.

[0034] A limiting sleeve 12 is fixed to the top of the acquisition box 1, through which the acquisition head 7 passes. An L-shaped limiting groove 13 is provided through the limiting sleeve 12, with the vertical section of the limiting groove 13 extending to the top of the limiting sleeve 12. A handle 14 is fixed to the acquisition head 7 and engages with the horizontal section of the limiting groove 13. By rotating the acquisition head 7 and moving the handle 14 until the handle 14 can no longer move, the acquisition head 7 can be pulled upwards to perform acquisition. The design of the limiting sleeve 12, the limiting groove 13, and the handle 14 improves the stability of the acquisition head 7 during device movement.

[0035] A pulley 15 is fitted onto the limiting post 5, and the sampling hose 2 fits into the groove on the pulley 15. The number of pulleys 15 is equal to the number of limiting posts 5, and their positions correspond one-to-one. The pulleys 15 reduce the probability of slippage when the sampling hose 2 moves.

[0036] A slide rod 16 is fixed inside the slide groove 3. The slide rod 16 passes through the slider 4 and slides in engagement with it. The number of slide rods 16 is equal to the number of sliders 4, and their positions correspond one-to-one. The slide rods 16 improve the stability of the slider 4 during movement.

[0037] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A sampling device for volatile organic compounds in exhaust gas, comprising a mobile cart, characterized in that: A collection box (1) is fixed on the mobile trolley. A collection hose (2) fixed to the collection box (1) is installed through the collection box (1). The upper end of the collection hose (2) passes through the top of the collection box (1) and slides. Multiple grooves (3) are opened on the inner wall of the collection box (1). A slider (4) slides in the groove (3). A limit post (5) is rotatably connected to the slider (4). A spring (6) is fixed between the slider (4) and the groove (3). The number of grooves (3), the number of sliders (4), the number of limit posts (5) and the number of springs (6) are all equal and their positions correspond one to one. The collection hose (2) passes around the side wall of multiple limit posts (5) in sequence. The upper end of the collection hose (2) rotates and is connected to a collection head (7). The collection box (1) is provided with a collection mechanism (8) for drawing volatile organic gases from the outside into the collection hose (2) through the collection head (7) and collecting them.

2. The sampling device for volatile organic compounds in exhaust gas according to claim 1, characterized in that: The collection mechanism (8) includes an air extraction assembly (81), which includes an air pump (811) fixed to the collection box (1), a gas distribution box (812) fixed and connected to the air outlet of the air pump (811), and a plurality of exhaust pipes (813) fixed and connected to the gas distribution box (812). The collection hose (2) is fixed and connected to the air inlet of the air pump (811). The collection mechanism (8) also includes a collection assembly (82) for collecting the gas discharged into the gas distribution box (812).

3. The waste gas volatile organic compound sampling device according to claim 2, characterized in that: The collection assembly (82) includes multiple collection bags (821) placed on a mobile cart, a gas delivery hose (822) fixed and connected to the collection bag (821), and a connecting sleeve (823) rotatably installed at the end of the gas delivery hose (822) away from the collection bag (821). The connecting sleeve (823) is connected to the gas delivery hose (822) and threadedly connected to the exhaust pipe (813). Both the gas delivery hose (822) and the gas distribution box (812) are equipped with a switch valve.

4. The waste gas volatile organic compound sampling device according to claim 3, characterized in that: The mobile trolley is fixed with a limiting shell (9) for placing the collection bag (821). The top of the limiting shell (9) is provided with a limiting through hole (10) extending to the side of the limiting shell (9) away from the air pump (811). The air delivery hose (822) passes through the limiting through hole (10). The number of limiting shells (9), the number of limiting through holes (10) and the number of air delivery hoses (822) are all equal and their positions correspond one-to-one.

5. The waste gas volatile organic compound sampling device according to claim 1, characterized in that: The collection head (7) is internally threaded with a filter plate (11).

6. The waste gas volatile organic compound sampling device according to claim 1, characterized in that: The top of the acquisition box (1) is fixed with a limiting sleeve (12) through which the acquisition head (7) passes. The limiting sleeve (12) is provided with a limiting slot (13) of L-shaped structure. The vertical section of the limiting slot (13) extends to the top of the limiting sleeve (12). The acquisition head (7) is fixed with a handle (14) that is engaged with the horizontal section of the limiting slot (13).

7. The waste gas volatile organic compound sampling device according to claim 1, characterized in that: The limiting post (5) is fitted with a pulley (15), and the collection hose (2) fits into the groove on the pulley (15). The number of pulleys (15) is equal to the number of limiting posts (5) and their positions correspond one-to-one.

8. The waste gas volatile organic compound sampling device according to claim 1, characterized in that: A slide rod (16) is fixed inside the slide groove (3). The slide rod (16) passes through the slider (4) and slides together. The number of slide rods (16) is equal to the number of sliders (4) and their positions correspond one-to-one.

Images