Device for recovering VOCs (Volatile Organic Compounds) gas

Abstract

The embodiment of the invention discloses a device for recovering VOCs (volatile organic compounds) gas. According to one specific implementation mode, the device comprises an inner ring, an outer ring, an air inlet channel, an air suction channel, a branch pipeline and a connecting support. The inner ring and the outer ring are coaxially arranged and are connected through the connecting bracket; the inner ring is provided with an air outlet ring, and the air outlet ring is arranged towards the outer ring; the inner ring is connected with an air inlet channel, and the air inlet channel is arranged along the axis of the inner ring and the outer ring and connected with a compressor; the outer ring is provided with an air suction hole array, and the air suction hole array is distributed on the surface of the outer ring; the at least two branch pipelines are evenly distributed on the inner side face of the outer ring and connected with the air suction channel. The air suction channel and the air inlet channel are arranged in the same direction, the air suction channel is connected with an air suction machine, and the device for recycling the VOCs gas is used for being connected with a nozzle. According to the embodiment, the contact surface area of the inner ring and the outer ring and the VOCs gas is small, the amount of the VOCs gas attached to the inner ring and the outer ring due to liquefaction is small, and the service life can be prolonged.

Description

Technical Field

[0001] The embodiments of the present disclosure relate to the technical field of waste gas treatment, and particularly to a device for recovering VOCs gas. Background Art

[0002] Volatile organic compounds (VOCs) are widespread pollutants in industrial production processes. VOCs are toxic, flammable, and photochemically active, posing a threat to human health (such as respiratory illnesses and cancer risks) and contributing to atmospheric photochemical smog and ozone layer depletion. Spraying operations generate large quantities of VOCs. Currently, a common method for recovering VOCs is to cover the spraying area with a hood and extract them with suction equipment at the bottom. This method allows for the recovery of VOCs.

[0003] However, when using this method to recover VOCs, the hood is fixed and covers the entire spraying area, requiring a large surface area. This large area of ​​contact with the VOCs causes the VOCs to liquefy and adhere to the hood surface, increasing the hood's weight. Furthermore, the VOCs adhering to the hood surface contain acidic and alkaline components, which corrode the hood and degrade its mechanical properties, often resulting in a shortened hood lifespan.

[0004] The above information disclosed in this Background section is only for enhancement of understanding of the background of the inventive concept and therefore it may contain information that does not form the prior art that is already known in this country to a person of ordinary skill in the art. Summary of the Invention

[0005] The content of this disclosure is used to briefly introduce concepts that will be described in detail in the detailed description section below. The content of this disclosure is not intended to identify key features or essential features of the claimed technical solution, nor is it intended to limit the scope of the claimed technical solution.

[0006] Some embodiments of the present disclosure provide a device for recovering VOCs gas to solve one or more of the technical problems mentioned in the above background technology section.

[0007] Some embodiments of the present disclosure provide a device for recovering VOCs gas, which includes: an inner ring, an outer ring, an air inlet channel, an air suction channel, a branch pipe and a connecting bracket; the inner ring and the outer ring are coaxially arranged, and the inner ring and the outer ring are connected by the connecting bracket; the inner ring is provided with an air outlet ring, and the air outlet ring is arranged in the direction of the outer ring; the inner ring is connected to the air inlet channel, and the air inlet channel is arranged along the axis of the inner ring and the outer ring, and the air inlet channel is connected to a compressor; the outer ring is provided with an air suction hole array, and the air suction hole array is distributed on the surface of the outer ring; there are at least two branch pipes, and the branch pipes are evenly distributed on the inner side surface of the outer ring, and the branch pipes are connected to the air suction channel; the air suction channel is arranged in the same direction as the air inlet channel, and the air suction channel is connected to the air intake machine, and the device for recovering VOCs gas is used to be connected to the nozzle.

[0008] Optionally, the air intake channel and the air intake channel are arranged adjacent to each other, and a fixing plate is provided between the air intake channel and the air intake channel; the fixing plate is provided with a channel hole, and the channel hole is nested in the air intake channel and the air intake channel.

[0009] Optionally, the device for recovering VOCs gas further includes a baffle, which is nested in the gas outlet ring.

[0010] Optionally, the connecting bracket includes a buckle and a connecting rod, both ends of the connecting rod are connected with the buckle, and the connecting rod is connected to the inner ring and the outer ring through the buckles at both ends.

[0011] Optionally, threaded holes are provided on the edge of the fixing plate.

[0012] Optionally, the inner ring and the outer ring are covered with a Teflon coating.

[0013] Optionally, the inner ring is provided with a support plate, and the support plate is connected to the air intake channel.

[0014] Optionally, the above-mentioned device for recovering VOCs gas also includes a fixing flange and a mounting plate; the above-mentioned fixing flange is arranged at the rear end of the above-mentioned nozzle, and the above-mentioned nozzle generates VOCs gas; the above-mentioned nozzle is located between the above-mentioned inner ring and the above-mentioned outer ring; the above-mentioned mounting plate is provided with a channel hole, and the above-mentioned channel hole is nested in the above-mentioned air intake channel and the above-mentioned air intake channel; the above-mentioned fixing flange is fixedly connected to the above-mentioned mounting plate; the above-mentioned mounting plate is fitted with the above-mentioned fixing plate, and the above-mentioned mounting plate is provided with a through hole at a corresponding position of the threaded hole provided on the above-mentioned fixing plate, and the above-mentioned mounting plate is fixedly connected to the above-mentioned fixing plate by screws.

[0015] The above-described various embodiments of the present disclosure have the following beneficial effects: the apparatus for recovering VOCs gas according to some embodiments of the present disclosure can reduce the contact area with VOCs gas and extend its service life. Specifically, the short service life of the VOCs gas recovery apparatus is caused by the large contact area between the cover and the VOCs gas, which causes the VOCs gas to liquefy and adhere to the surface of the cover, increasing the weight of the cover. Furthermore, the VOCs attached to the cover surface contain acidic and alkaline components, which corrode the cover, causing its mechanical properties to deteriorate, ultimately resulting in a short service life of the cover. Based on this, some embodiments of the present disclosure include a device for recovering VOCs gas, comprising: an inner ring, an outer ring, an air inlet channel, an air intake channel, a branch pipe, and a connecting bracket; the inner ring and the outer ring are coaxially arranged and connected by the connecting bracket; the inner ring is provided with an air outlet ring, which is arranged toward the outer ring; the inner ring is connected to the air inlet channel, which is arranged along the axis of the inner ring and the outer ring, and the air inlet channel is connected to a compressor; the outer ring is provided with an air intake hole array, which is distributed on the surface of the outer ring; there are at least two branch pipes, which are evenly distributed on the inner side surface of the outer ring, and the branch pipes are connected to the air intake channel; the air intake channel is arranged in the same direction as the air inlet channel, and the air intake channel is connected to an air intake machine; the device for recovering VOCs gas is connected to a nozzle. The VOCs gas is guided to the outer ring through the air outlet ring of the inner ring, and recovered through the air intake hole array of the outer ring. The disclosed device for recovering VOCs is connected to the nozzle and moves with it, allowing for immediate recovery of VOCs as they are generated. This eliminates the need for a large surface area. Furthermore, gas from the inner ring's outlet ring continuously flushes the outer surface of the outer ring, reducing the amount of VOCs liquefied and deposited at fixed locations on the outer ring. Consequently, the amount of VOCs deposited on the inner and outer rings due to liquefaction is reduced, slowing the rate of corrosion caused by the liquefied VOCs and extending their service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other features, advantages, and aspects of the various embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and that components and elements are not necessarily drawn to scale.

[0017] Figure 1 is a schematic structural diagram of an apparatus for recovering VOCs gas from one perspective in some embodiments of the present disclosure;

[0018] Figure 2Schematic diagram of the structure of the nozzle connection of the device for recovering VOCs gas in some embodiments of the present disclosure;

[0019] Figure 3 is a schematic structural diagram of an apparatus for recovering VOCs gas from another perspective in some embodiments of the present disclosure;

[0020] Figure 4 It is a schematic structural diagram of the branch pipeline of the device for recovering VOCs gas in some embodiments of the present disclosure. DETAILED DESCRIPTION

[0021] Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be construed as being limited to the embodiments described herein. On the contrary, these embodiments are provided to provide a more thorough and complete understanding of the present disclosure. It should be understood that the drawings and embodiments of the present disclosure are for illustrative purposes only and are not intended to limit the scope of protection of the present disclosure.

[0022] It should also be noted that, for ease of description, only the parts related to the invention are shown in the drawings. In the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0023] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0024] It should be noted that the modifications of "one" and "multiple" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, they should be understood as "one or more".

[0025] The names of the messages or information exchanged between multiple devices in the embodiments of the present disclosure are only used for illustrative purposes and are not used to limit the scope of these messages or information.

[0026] The present disclosure will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0027] Figure 1 It is a schematic structural diagram of an apparatus for recovering VOCs gas according to some embodiments of the present disclosure. Figure 1 It includes an inner ring 1, an air outlet ring 2, a connecting bracket 3, a branch pipe 4, an outer ring 5, an air suction hole array 6, an air suction channel 7, an air intake channel 8, and a fixing plate 9.

[0028] Figure 2It is a schematic structural diagram of a nozzle connection device for recovering VOCs gas in some embodiments of the present disclosure. Figure 2 It includes a baffle 18, a nozzle 19, a fixing flange 20, a mounting plate 21, a baffle inlet end 22, and a baffle outlet end 23.

[0029] In some embodiments, the device for recovering VOCs gas includes an inner ring 1, an outer ring 5, an air inlet channel 8, an air intake channel 7, a branch pipe 4, and a connecting bracket 3. Both the inner ring 1 and the outer ring 5 can be annular pipes with curved outer surfaces, which can reduce the contact area with the VOCs gas and prevent the liquefied VOCs gas from adhering to the surfaces of the inner ring 1 and outer ring 5 in large quantities, thereby reducing maintenance costs and extending service life. The inner ring 1 can be used for exhaust, guiding the flow of VOCs gas through airflow. The outer ring 5 can be used for intake, used to recover VOCs gas. The inner ring 1 and the outer ring 5 are connected by the connecting bracket 3, which can be a steel pipe. The inner ring 1 and the outer ring 5 are connected by a welding process to increase the connection strength between the inner ring 1 and the outer ring 5.

[0030] In some embodiments, the inner ring 1 is provided with an air outlet ring 2, which can be an annular notch in the inner ring 1. These notches are continuously distributed around the circumference of the inner ring 1, forming an annular air outlet channel. This serves to create an airflow barrier during air outlet, directing the flow of VOCs. The air outlet ring 2 is positioned toward the outer ring 5, directing VOCs to the outer ring 5 for recovery. The inner ring 1 and outer ring 5 are coaxially arranged, sharing the same axis. This allows the airflow barrier to form a closed loop with the outer ring 5, improving VOC recovery. Furthermore, the airflow barrier continuously flushes the outer surface of the outer ring 5, reducing VOC liquefaction and deposition at fixed locations on the outer surface of the outer ring 5. The inner radius of the outer ring 5 can be larger than that of the inner ring 1, so that the airflow barrier formed by the air outlet ring 2 in the inner ring 1 faces the inner surface of the outer ring 5, further improving VOC recovery through the Coanda effect. The inner side surface of the outer ring 5 may be a surface close to the axis of the outer ring 5 .

[0031] In some embodiments, the inner ring 1 is connected to the air inlet channel 8, which can be a metal tube for conveying air. The air inlet channel 8 communicates with the interior of the inner ring 1 and can be welded to the inner ring 1. The connection between the air inlet channel 8 and the inner ring 1 can be configured as an oblate elliptical structure, transitioning the cross-section of the air inlet channel 8 from a circular to an oblate elliptical shape. This allows for uniform distribution of the airflow entering the inner ring 1 through the air inlet channel 8. The air inlet channel 8 is positioned along the axis of the inner ring 1 and the outer ring 5, at the end away from the outer ring 5, for easy connection to a compressor. The air inlet channel 8 is connected to a compressor, which can be a power device that provides compressed air, providing a stable airflow to the inner ring 1. For example, the compressor can be an oil-free screw compressor. The outer ring 5 is provided with an array of intake holes 6, which can be evenly distributed holes for absorbing VOCs. The air intake hole array 6 may be distributed on a side away from the inner ring 1 , so that the airflow is evenly distributed on the surface of the outer ring 5 , thereby increasing the efficiency of recovering VOCs gas.

[0032] In some embodiments, the branch pipes 4 may be metal pipes. These branch pipes 4 communicate with the outer ring 5 and may be welded to the inner surface of the outer ring 5 at a predetermined angle to the horizontal plane of the outer ring 5 to facilitate connection to the intake channel 7. There may be at least two branch pipes 4, distributed along the inner surface of the outer ring 5, to direct VOCs gas drawn in through the intake hole array 6 to the intake channel 8 through the branch pipes 4, thereby facilitating VOC gas recovery. For example, there may be three branch pipes 4, distributed around the center of the outer ring 5. Specifically, one branch pipe may be provided on the inner surface of the outer ring 5 at a location corresponding to the intake channel 8. Two branch pipes may then be provided symmetrically, 90° apart from the branch pipe. The three branch pipes converge and communicate with the intake channel 7, conveying VOCs gas drawn in by the intake hole array 6 to the intake channel 7. It should be noted that the three branch pipes are not evenly distributed because, when connected, nozzle 19 will be located between the inner ring 1 and the outer ring 5, requiring sufficient space for nozzle 19. The branch pipe 4 is connected to the intake channel 7 by welding, allowing VOCs to be drawn in by the intake hole array 6 and into the intake channel 7 through the branch pipe 4. The intake channel 7 is arranged in the same direction as the inlet channel 8 to facilitate connection to an air intake machine. The air intake machine can be a power device that provides suction, used to transport VOCs drawn in by the intake hole array 6 of the outer ring 5 through the intake channel 7 to a harmless treatment device. The harmless treatment device can be an activated carbon adsorption tower for adsorbing VOCs. Specifically, the device for recovering VOCs can be connected to the nozzle 19 and can move with the nozzle 19 to recover VOCs generated by the nozzle 19 during operation. Specifically, the nozzle 19 can be inserted through the inner ring 1, with the inner ring 1 positioned at the rear end of the nozzle 19 and the outer ring 5 positioned at the front end, positioning the nozzle 19 between the inner and outer rings 1 and 5. When the nozzle 19 is in operation, it generates VOCs. The compressor can provide airflow power to the inner ring 1, and the outlet ring 2 of the inner ring 1 forms an airflow barrier to prevent VOCs from escaping. The airflow barrier also directs VOCs toward the outer ring 5. Powered by the aspirator, the outer ring 5 can draw the VOCs directed from the inner ring 1 into the harmless treatment device through the aspirator array 6, thereby recovering the VOCs. Because the VOC recovery device can be connected to the nozzle 19 and move with it, VOCs generated by the nozzle 19 can be promptly recovered through the outer ring 5, eliminating the need for a large surface area.At the same time, the gas blown out of the outlet ring 2 of the inner ring 1 continuously flushes the outer surface of the outer ring 5, reducing the liquefaction and deposition of VOCs at fixed locations on the outer surface of the outer ring 5. As a result, the amount of liquefied VOCs adhering to the inner ring 1 and the outer ring 5 is relatively small, which can slow the corrosion rate of the liquefied VOCs on the inner ring 1 and the outer ring 5, thereby extending the service life.

[0033] Optionally, the air intake channel 8 and the air intake channel 7 can be arranged adjacent to each other to facilitate fixing the air intake channel 8 and the air intake channel 7. A fixing plate 9 is provided between the air intake channel 8 and the air intake channel 7 to fix the air intake channel 8 and the air intake channel 7 and prevent the air intake channel 8 and the air intake channel 7 from displacement. The fixing plate 9 can be a metal plate-like structure. The fixing plate 9 is provided with a channel hole. There can be two channel holes, which are respectively consistent with the size of the air intake channel 8 and the air intake channel 7, and are used to nest the air intake channel 8 and the air intake channel 7 to play a fixing role.

[0034] Optionally, the device for recovering VOCs gas further includes a baffle 18. The baffle 18 can be a conical, corrosion-resistant polypropylene baffle suitable for use in the device for recovering VOCs gas. The radius of the baffle inlet end 22 of the baffle 18 gradually increases toward the radius of the baffle outlet end 23, forming a trumpet-shaped structure. This allows the airflow to expand along the inner surface of the conical baffle 18, reducing the airflow velocity and the VOCs gas flow rate, thereby improving the VOCs gas recovery efficiency of the outer ring 5. The conical range formed by the baffle 18 can cover the outer ring 5, allowing the airflow from the outlet ring 2 to expand along the inner surface of the baffle 18. This reduces the airflow velocity, reduces the possibility of VOCs being carried away from the outer ring 5 by the airflow due to the outer ring 5 failing to recover VOCs in a timely manner, and reduces the impact of excessive airflow velocity on the VOCs gas recovery efficiency of the outer ring 5. The baffle inlet end 22 can be nested in the air outlet ring 2, so that the airflow will expand when passing through the air outlet ring 2, so that the airflow originally concentrated in the outer ring 5 is gradually dispersed to a larger range, reducing the problem of local airflow being too strong or too weak. For example, the width of the air outlet ring 2 can be 3mm, and the thickness of the baffle 18 can be 0.5mm. The baffle inlet end 22 can be embedded in the air outlet ring 2, and the baffle 18 is connected to the air outlet ring 2 through the extrusion between the air outlet ring 22 and the baffle 18. At the same time, since the width of the air outlet ring 2 is greater than the thickness of the baffle 18, the airflow can still flow out through the gap between the air outlet ring 2 and the baffle 18, and expand along the inner surface of the baffle 18, so that the flow rate of the airflow is reduced, reducing the impact of the excessive flow rate of the airflow on the recovery of VOCs gas by the outer ring 5. The conical range formed by the baffle 18 can cover the outer ring 5, with a large surface area, and therefore a larger area of ​​contact with VOCs gas. To reduce the adhesion and accumulation of VOCs gas, the baffle 18 can be removed and cleaned. After cleaning, the baffle inlet end 22 can be re-inserted into the outlet ring 2 to achieve the connection between the baffle 18 and the outlet ring 2. Since the baffle 18 is connected to the outlet ring 2 by extrusion, the baffle 18 can be pulled out and cleaned using a force opposite to the extrusion, which can extend the service life of the baffle 18.

[0035] Optionally, the connecting bracket 3 may include a buckle and a connecting rod. The outer surfaces of the inner ring 1 and outer ring 5 may be provided with grooves of the same width as the buckle to prevent displacement of the buckle when inserted. The buckle is provided with a threaded hole, and the connecting rod has through-holes at both ends. The connecting rod can be connected to the buckle via screws. Specifically, a screw can be inserted through the through-hole of the connecting rod and engage with the threaded hole of the buckle to achieve connection between the connecting rod and the buckle. The buckle is connected to both ends of the connecting rod. The connecting rod connects to the inner ring 1 and the outer ring 5 via the buckles at both ends, providing support for the inner ring 1 and the outer ring 5.

[0036] Optionally, the edge of the fixing plate 9 is provided with threaded holes, which can be connected to the nozzle 19 through the threaded holes to achieve the fixing of the device for recovering VOCs gas. Specifically, the fixing plate 9 can be rectangular in shape with chamfered vertices. The channel holes can be distributed in the middle of the fixing plate 9, and the threaded holes can be provided along the edge of the fixing plate 9.

[0037] Optionally, the outer surfaces of the inner ring 1 and the outer ring 5 and the air intake hole array are covered with a Teflon coating, which can reduce the adhesion of VOCs gas and prevent VOCs gas from clogging the air intake hole array 6.

[0038] Figure 3 This is a structural schematic diagram of another perspective of the device for recovering VOCs gas in some embodiments of the present disclosure. Figure 3 It includes a support plate 16 and a connecting plate 17 .

[0039] Optionally, the inner ring 1 is provided with a support plate 16. The support plate 16 may be a structure protruding from the inner side surface of the outer surface of the inner ring 1, and is used to support the air intake passage 7. The support plate 16 is connected to the air intake passage 7. Specifically, the support plate 16 may be provided with a threaded hole, and a connecting plate 17 may be provided at a corresponding position of the air intake passage 7. The connecting plate 17 may be a structure protruding from the air intake passage 7. The connecting plate 17 is provided with a threaded hole corresponding to the threaded hole of the support plate 16. The threaded hole of the connecting plate 17 can be aligned with the thread of the support plate 16, and the connection plate 17 can be fixed by screws to achieve fixed support for the air intake passage 7.

[0040] Optionally, the device for recovering VOCs gas further includes a fixed flange 20 and a mounting plate 21. The fixed flange 20 may be a disc-shaped connector. The fixed flange 20 is used to be fixed to the rear end of the nozzle 19, which generates VOCs gas during operation. The nozzle 19 may be located between the inner ring 1 and the outer ring 5, so as to facilitate the outer ring 5 to recover VOCs gas. The mounting plate 21 may be a metal plate, which is used to connect the device for recovering VOCs gas and the nozzle 19. Specifically, the mounting plate 21 is provided with a channel hole, and there may be two channel holes, which are respectively consistent with the size of the air intake channel 8 and the air intake channel 7, and are used to nest the air intake channel 8 and the air intake channel 7. The fixed flange 20 is fixedly connected to the mounting plate 21. For example, the mounting plate 21 may be fixedly connected to the fixed flange 20 by welding. The fixing flange 20 and the mounting plate 21 can have the same thickness. One end of the mounting plate 21 can be provided with a groove shaped to mate with the side of the fixing flange 20. Specifically, the groove of the mounting plate 21 can be aligned with the side of the fixing flange 20 and then secured by welding. The mounting plate 21 and the fixing plate 9 can have similar shapes to facilitate their aligned installation. The mounting plate 21 has through-holes at locations corresponding to the threaded holes in the fixing plate 9. The mounting plate 21 and the fixing plate 9 are secured together by screws. Specifically, the fixing plate 9 can be first inserted into the intake and intake channels 8 and 7, then the nozzle 19 can be inserted through the inner ring 1. Finally, the mounting plate 21 can be inserted into the intake and intake channels 8 and 7 and aligned with the fixing plate 9. Finally, the fixing plate 9 and the mounting plate 21 are secured together with screws to connect the device for recovering VOCs gas to the nozzle 19. This connection allows the nozzle 19 to be positioned between the inner ring 1 and the outer ring 5, allowing the VOCs gas generated by the nozzle 19 to be guided by the airflow barrier formed by the outlet ring 2 of the inner ring 1 and promptly recovered by the outer ring 5. Furthermore, the detachable connection between the VOCs gas recovery device and the nozzle 19, achieved by screws, facilitates disassembly of the VOCs gas recovery device. After extended use, the VOCs gas recovery device may still retain liquefied VOCs, allowing the device to be disassembled for cleaning, thereby extending its service life.

[0041] Further, in the process of adopting technical solutions to solve the technical problems mentioned in the background, there is often the following technical problem: after a long period of accumulation, the outer ring, branch pipe 4 and suction passage will be attached to the inner wall due to the liquefaction of VOCs gas. In view of this technical problem, the conventional solution is generally to disassemble the device and clean it with a special cleaning liquid. However, the above conventional solution still has the following problems: the outer ring, branch pipe 4 and suction passage are of an integrated structure, and there is still a lot of residual VOCs liquid inside the pipe after cleaning.

[0042] In view of the problems of the above conventional solution, in the face of the above technical problem: after a long period of accumulation, the outer ring, branch pipe and suction passage will be attached to the inner wall due to the liquefaction of VOCs gas. And the inventor considers the disadvantage of "the device of an integrated structure still has a lot of residual VOCs liquid after cleaning", and combines the technology owned by the unit where the inventor is located, and can decide to adopt the following solution.

[0043] Figure 4 is a structural schematic view of a branch pipe of a device for recycling VOCs gas according to some embodiments of the present disclosure. Figure 4 It comprises a second docking end 10, a clamping groove 11, a first docking end 12, a grappling hook 13, a first pipe 14, and a second pipe 15.

[0044] Optionally, the branch pipe 4 includes a first pipe 14 and a second pipe 15. The first and second pipes 14, 15 may be metal pipes. The first pipe 14 may be fixed to the inner surface of the outer ring 5 by welding. The first pipe 14 communicates with the interior of the outer ring 5. The second pipe 15 may be fixedly connected to the intake channel 7 by welding. The second pipe 15 communicates with the interior of the intake channel 7. The first and second pipes 14, 15 may be detachably connected to facilitate cleaning of liquefied VOCs adhered to the inner wall. The first pipe 14 has a first docking end 12, which may be a disc-shaped protrusion. The docking surface of the first docking end 12 is provided with an annular groove embedded in a sealing ring to enhance sealing and prevent VOC gas leakage. The docking surface of the first docking end 12 may be the surface that contacts the second docking end 10. The back of the first docking end 12 has a retaining groove 11 for receiving a hook 13 to secure the first and second pipes 14, 15. At least two of the above-mentioned slots 11 can be symmetrically arranged to increase the stability of the fixation of the above-mentioned first pipe 14 and the second pipe 15. The back side of the above-mentioned first docking end 12 can be a side away from the docking surface of the above-mentioned first docking end 12. The above-mentioned second pipe 15 is provided with a second docking end 10, and the above-mentioned second docking end 10 can be a disc-shaped protrusion, and the radius of the above-mentioned second docking end 10 is larger than the above-mentioned first docking end 12. The above-mentioned second docking end 10 is provided with a disc-shaped groove, and the radius of the above-mentioned disc-shaped groove is the same as the radius of the above-mentioned first docking end 12, which is used to embed the above-mentioned first docking end 12. The depth of the above-mentioned disc-shaped groove is the same as the thickness of the above-mentioned first docking end 12, which facilitates the embedding of the grab hook 13 into the above-mentioned slot 11. The above-mentioned second docking end 10 is provided with a grab hook 13, and the above-mentioned grab hook 13 can be composed of an elastic hook body and a metal frame. The elastic hook body can be an "L"-shaped hook body made of polyurethane material, which has excellent resilience and wear resistance. One end of the elastic hook body can be fixed to the edge of the second docking end 10 by a hinge, so that the elastic hook body can rotate around the hinge. The other end of the elastic hook body is provided with a serrated structure, which can be embedded in the above-mentioned slot 11 to increase the stability of the connection between the first pipe 14 and the second pipe 15. The metal skeleton can be an "L"-shaped metal sheet, which is attached to the surface of the elastic hook body to provide rigid support for the elastic hook body. The grab hook 13 corresponds to the position of the above-mentioned slot 11. The docking surface of the second docking end is provided with an annular protrusion, which corresponds to the position of the annular groove, and is used to squeeze the sealing ring of the first docking end 12 during connection, further increasing the sealing and preventing VOCs gas leakage.

[0045] The above optional embodiment, as an inventive point of the embodiment of the present disclosure, solves the technical problem that "the device with an integrated structure is difficult to clean and still has a lot of residual VOCs liquid." The factors that lead to a lot of residual VOCs liquid in the device after cleaning are often as follows: the outer ring, branch pipes and air intake channel are an integrated structure, so there will still be a lot of residual VOCs liquid inside the pipes after cleaning. If the above factors are solved, the effect of reducing the residual VOCs liquid can be achieved. In order to achieve this effect, the present disclosure sets the branch pipe as a detachable connection, and the first pipe and the second pipe can be separated during cleaning, which is more convenient for cleaning and can reduce the residual VOCs liquid.

[0046] Furthermore, in the process of adopting technical solutions to solve the technical problems mentioned in the background technology, the following technical problems are often accompanied: VOCs gas contains a large amount of recyclable high-value solvent resources, and directly treating VOCs gas harmlessly will increase resource waste. In response to this technical problem, the conventional solution is generally to liquefy and collect the solvent in the VOCs gas through a condensation device. However, the above conventional solution still has the following problems: VOCs gas contains water, which can easily cause ice to form at the entrance of the gas flow channel in low-temperature areas, and the risk of ice formation is high.

[0047] Considering the problems with the aforementioned conventional solutions and the aforementioned technical issues, VOCs contain a large amount of recyclable, high-value solvent resources. Directly treating VOCs for harmlessness would increase resource waste. However, the inventors, taking into account the disadvantage that "VOCs contain moisture, which can easily cause ice formation at the gas flow channel entrance in low-temperature areas, resulting in a high risk of ice formation," and incorporating the technologies available at their organization, have decided to adopt the following solution.

[0048] Optionally, one end of the branch pipe 4 connected with the outer ring 5 is provided with a flow collecting structure. The flow collecting structure can be a horn-shaped structure with gradually increasing cross-sectional area of the branch pipe 4 along the airflow direction, which can make the airflow transition smoothly and reduce the pressure loss. The inner wall surface of the flow collecting structure is covered with a drag reduction coating. The drag reduction coating can be a fluorine-containing acrylic resin, which can reduce the frictional resistance when the gas flows and prevent VOCs gas condensate droplets from adhering to the wall of the branch pipe 4. One end of the branch pipe 4 connected with the gas inlet channel 8 is provided with an acceleration structure. The acceleration structure can be a structure with gradually decreasing cross-sectional area of the branch pipe 4 along the airflow direction, which is used to enhance the delivery power of VOCs gas and reduce the power demand of the air suction machine. A condensing device is provided between the air suction channel 7 and the air suction machine, which is used to reduce the temperature of VOCs gas, liquefy and collect VOCs gas. The condensing device is provided with a connecting pipe and a condensing core. The connecting pipe can be a metal pipe, which is used to connect the gas inlet channel 8 and the condensing core. One end of the connecting pipe is in communication with the gas inlet channel 8. The other end of the connecting pipe is in communication with the condensing core, which is used to introduce VOCs gas from the gas inlet channel 8 into the condensing core, condense VOCs gas through the condensing core, and thus recover the condensed VOCs liquid. Specifically, the condensing core can be horizontally placed, and the connecting pipe can be tangentially communicated with the condensing core, which can make VOCs gas produce a cyclone effect when entering the condensing core, improve the contact efficiency of VOCs gas with the condensing core, and improve the condensing efficiency. The condensing core can be a tubular channel for reducing the temperature of VOCs gas. The condensing core includes an inner pipe and an outer pipe which are coaxially nested. The inner pipe and the outer pipe can be metal pipes for circulating refrigerant. The inner pipe and the outer pipe can be used to circulate VOCs gas. The inner pipe and the outer pipe are not communicated with each other. The inner pipe can be nested in the inner part of the outer pipe, which can reduce the equipment volume and installation cost. The inner pipe is supplied with a first temperature level refrigerant. The first temperature level refrigerant can be a refrigerant for preliminary cooling of VOCs gas. For example, R290 refrigerant at 0-10℃ can be used for preliminary cooling of VOCs gas, which can make the moisture in VOCs gas condense and collect preferentially, and prevent ice blocking caused by water icing. Specifically, a hydrophilic plate and a collection tank can be provided at the interface between the condensing core and the connecting pipe, which are used to collect water droplets condensed after preliminary cooling. The collection tank is connected to the outside of the condensing core. The hydrophilic plate can be a copper metal plate, which is located between the inner pipe and the outer pipe and has a certain angle with the vertical direction, which facilitates the sliding of water droplets condensed on the hydrophilic plate. The collection tank can be located below the hydrophilic plate. The inlet of the collection tank can be funnel-shaped, which can make water droplets slide into the collection tank. The outer pipe is supplied with a second temperature level refrigerant. The second temperature level refrigerant can be a refrigerant for deep cooling of VOCs gas preliminarily cooled.For example, R23 refrigerant at -70 to -75°C has excellent refrigeration capacity and can be used to condense low-boiling-point VOCs. The countercurrent flow of the first temperature-stage refrigerant and the second temperature-stage refrigerant can generate a temperature gradient in the condensing core, causing the temperature of the VOCs gas to gradually decrease, thereby preventing the sudden drop in temperature from freezing the water in the VOCs gas and causing ice blockage. A gas flow channel is provided between the inner tube and the outer tube. The gas flow channel can be the gap between the inner tubes, which is used to pass the VOCs gas and exchange heat with the refrigerant flowing between the outer tube and the inner tube, so that the VOCs gas is condensed and liquefied. In order to make the condensed and liquefied VOCs liquid easier to flow, the gas flow channel can be provided with a smoother inner wall and covered with a polyurethane coating. The cross-sectional area of ​​the gas flow channel decreases along the airflow direction, which can increase the flow rate of the VOCs gas and drive the condensed VOCs liquid to flow through the VOCs gas. The inlet end of the gas flow channel is located at the connection between the connecting pipe and the condensing core. The VOCs gas converges in the gas flow channel through the connecting pipe, which can balance the airflow and prevent excessive local temperature differences at the inlet end. The outlet end of the gas flow channel is connected to an air intake fan, which can provide power for the flow of the VOCs gas. The gas flow channel is provided with a guide groove along the direction of the airflow. The guide groove can be a groove for guiding the flow of the condensed VOCs liquid. At the same time, the guide groove is arranged along the direction of the airflow, and the VOCs liquid can be driven by the airflow. The outlet end is arranged on the side away from the guide groove to prevent the VOCs liquid from entering the next device from the outlet end with the airflow. A tapered transition section is provided between the guide groove and the outlet end to guide the VOCs liquid into the guide groove. The guide groove is connected to a liquid collection pipe. The liquid collection pipe can be located at the connection between the tapered transition section and the guide groove, and is arranged perpendicular to the outer tube to prevent the VOCs liquid from flowing back. The liquid collecting pipe can be a metal pipe, which is used to transport the VOCs liquid in the guide tank to the liquid storage tank. The liquid collecting pipe is connected to the liquid storage tank to collect the condensed VOCs liquid.

[0049] The above optional embodiment, as an inventive point of the embodiment of the present disclosure, solves the technical problem that "directly harmlessly treating VOCs gas will cause waste of resources." The factors that lead to waste of resources are often as follows: VOCs gas contains a large amount of recyclable high-value solvent resources, and directly harmlessly treating VOCs gas will increase resource waste. If the above factors are solved, the effect of reducing resource waste can be achieved. In order to achieve this effect, the present disclosure gradually cools down the VOCs gas by coaxially arranging inner and outer tubes, and collects the condensed and liquefied water droplets through hydrophilic plates and collection tanks to prevent the risk of freezing caused by sudden temperature drops. At the same time, the cross-sectional area of ​​the gas flow channel is gradually reduced along the airflow direction, thereby increasing the flow rate of the VOCs gas that has not been liquefied after condensation, driving the VOCs liquid to flow through the airflow, reducing the accumulation of VOCs liquid, and reducing the risk of freezing.

[0050] The above-described various embodiments of the present disclosure have the following beneficial effects: the apparatus for recovering VOCs gas according to some embodiments of the present disclosure can reduce the contact area with VOCs gas and extend its service life. Specifically, the short service life of the VOCs gas recovery apparatus is caused by the large contact area between the cover and the VOCs gas, which causes the VOCs gas to liquefy and adhere to the surface of the cover, increasing the weight of the cover. Furthermore, the VOCs attached to the cover surface contain acidic and alkaline components, which corrode the cover, causing its mechanical properties to deteriorate, ultimately resulting in a short service life of the cover. Based on this, some embodiments of the present disclosure include a device for recovering VOCs gas, comprising: an inner ring, an outer ring, an air inlet channel, an air intake channel, a branch pipe, and a connecting bracket; the inner ring and the outer ring are coaxially arranged and connected by the connecting bracket; the inner ring is provided with an air outlet ring, which is arranged toward the outer ring; the inner ring is connected to the air inlet channel, which is arranged along the axis of the inner ring and the outer ring, and the air inlet channel is connected to a compressor; the outer ring is provided with an air intake hole array, which is distributed on the surface of the outer ring; there are at least two branch pipes, which are evenly distributed on the inner side surface of the outer ring, and the branch pipes are connected to the air intake channel; the air intake channel is arranged in the same direction as the air inlet channel, and the air intake channel is connected to an air intake machine; the device for recovering VOCs gas is connected to a nozzle. The VOCs gas is guided to the outer ring through the air outlet ring of the inner ring, and recovered through the air intake hole array of the outer ring. The disclosed device for recovering VOCs is connected to the nozzle and moves with it, allowing for immediate recovery of VOCs as they are generated. This eliminates the need for a large surface area. Furthermore, gas from the inner ring's outlet ring continuously flushes the outer surface of the outer ring, reducing the amount of VOCs liquefied and deposited at fixed locations on the outer ring. Consequently, the amount of VOCs deposited on the inner and outer rings due to liquefaction is reduced, slowing the rate of corrosion caused by the liquefied VOCs and extending their service life.

[0051] The above description is only an illustration of some preferred embodiments of the present disclosure and the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the embodiments of the present disclosure is not limited to the technical solutions formed by the specific combination of the above-mentioned technical features, but should also cover other technical solutions formed by any combination of the above-mentioned technical features or their equivalent features without departing from the above-mentioned inventive concept. For example, the above-mentioned features are replaced with (but not limited to) technical features with similar functions disclosed in the embodiments of the present disclosure.

Claims

1. A device for recovering VOCs gas, characterized in that: The device for recovering VOCs gas includes an inner ring, an outer ring, an air inlet channel, an air intake channel, a branch pipe and a connecting bracket; The inner ring and the outer ring are coaxially arranged, and the inner ring and the outer ring are connected via the connecting bracket; The inner ring is provided with an air outlet ring, and the air outlet ring is arranged toward the outer ring; The inner ring is connected to the air intake passage, the air intake passage is arranged along the axis of the inner ring and the outer ring, and the air intake passage is connected to the compressor; The outer ring is provided with an array of air suction holes, and the array of air suction holes is distributed on the surface of the outer ring; There are at least two branch pipes, which are evenly distributed on the inner side of the outer ring and connected to the air intake channel; The air suction channel is arranged in the same direction as the air inlet channel, and the air suction channel is connected to the air suction machine; The device for recovering VOCs gas is used to be connected to the nozzle.

2. The device for recovering VOCs according to claim 1, characterized in that: The air inlet channel is arranged adjacent to the air suction channel, and a fixing plate is provided between the air inlet channel and the air suction channel; The fixing plate is provided with a channel hole, and the air inlet channel and the air suction channel are nested in the channel hole.

3. The device for recovering VOCs gas according to claim 1, characterized in that: The device for recovering VOCs gas also includes a baffle, which is nested in the gas outlet ring.

4. The device for recovering VOCs gas according to claim 1, characterized in that: The connecting bracket includes a buckle and a connecting rod. Both ends of the connecting rod are connected with the buckles. The connecting rod is connected to the inner ring and the outer ring through the buckles at both ends.

5. The device for recovering VOCs gas according to claim 2, characterized in that: The edge of the fixing plate is provided with threaded holes.

6. The device for recovering VOCs gas according to claim 1, characterized in that: The inner ring and the outer ring are covered with a Teflon coating.

7. The device for recovering VOCs gas according to claim 1, characterized in that: The inner ring is provided with a support plate, and the support plate is connected to the air suction channel.

8. The device for recovering VOCs gas according to claim 5, characterized in that: The device for recovering VOCs gas also includes a fixing flange and a mounting plate; The fixing flange is arranged at the rear end of the nozzle, and the nozzle generates VOCs gas; The nozzle is located between the inner ring and the outer ring; The mounting plate is provided with a channel hole, wherein the air inlet channel and the air suction channel are nested in the channel hole; The fixing flange is fixedly connected to the mounting plate; The mounting plate is fitted with the fixing plate, and the mounting plate is provided with a through hole at a position corresponding to the threaded hole provided on the fixing plate. The mounting plate and the fixing plate are fixedly connected by screws.

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