A device for recovering oil vapor

Abstract

This invention discloses an oil vapor recovery device. The outlet of the heater is connected to the inlet of a vacuum separator via a pipe. The lower outlet of the vacuum separator is connected to a fine filter via a pipe and an oil pump. A cyclone generator is installed at the top of the vacuum separator via a flange. An oil capture structure for oil-water separation is installed inside the cyclone generator. A scraping structure for cleaning the surface of the oil capture structure is installed on the oil capture structure. An adaptive sensing structure for driving its operation is installed inside the scraping structure. After the mixed airflow forms a high-speed rotating and rising cyclone through the action of the guide vanes, strong turbulent shearing is generated due to the reverse rotation of the guide vanes. The fine oil droplets that were not captured in the initial separation cannot follow the rapid change of airflow direction due to inertia and are thrown back to the oil capture structure, realizing secondary capture of oil mist. This greatly improves the capture effect of fine oil droplets and effectively improves the overall oil-water separation efficiency.

Description

Technical Field

[0001] This invention relates to the field of oil recovery equipment, and more particularly to a device for recovering oil vapor. Background Technology

[0002] In industrial production, machining, petrochemical and other fields, the widespread use of oil will generate a large amount of oil vapor. Direct discharge will not only cause serious waste of oil resources, but also pollute the atmospheric environment. At the same time, impurities in oil vapor may also have adverse effects on the production environment and equipment. Therefore, the recovery and utilization of oil vapor has become an important demand in the industry, and oil vapor recovery equipment has become an essential piece of equipment in related fields.

[0003] While existing oil vapor recovery equipment can achieve basic oil-water separation and oil recovery, its oil-water separation efficiency is low, only achieving single-pass coarse separation. It cannot effectively capture fine oil droplets carried in the airflow, resulting in some oil loss with the water vapor and poor recovery efficiency. Furthermore, the oil capture filters in these devices are mostly of ordinary structure, easily clogged by excessively thick oil films, and lack automatic cleaning designs, requiring periodic manual shutdowns for cleaning. This severely impacts the continuous operation efficiency of the equipment, increases maintenance costs, and the formation of a thick oil film on the filter surface further reduces oil capture efficiency and exacerbates filter clogging. Therefore, an oil vapor recovery device was designed. Summary of the Invention

[0004] The present invention provides a device for recovering oil vapor, which solves the above-mentioned problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An oil vapor recovery device includes a primary filter, a heater at the right end of the primary filter, an outlet of the primary filter connected to the inlet of the heater via a pipe and an oil pump, an outlet of the heater connected to the inlet of a vacuum separator via a pipe, an atomizing nozzle installed at the top inside the vacuum separator and connected to the atomizing nozzle via a pipe, a lower outlet of the vacuum separator connected to a fine filter via a pipe and an oil pump, a cyclone generator installed at the top of the vacuum separator via a flange, an oil capture structure for oil-water separation installed inside the cyclone generator, a scraping structure for cleaning the surface of the oil capture structure, an adaptive sensing structure for driving the scraping structure to work, an outlet at the top of the cyclone generator connected to the inlet of a condenser via a pipe, and an outlet of the condenser connected to the vacuum pump via a pipe. The vacuum pump extracts air from the vacuum separator, creating a vacuum. Under atmospheric pressure, the external oil enters the primary filter through the inlet pipe, where larger particles are initially removed. The oil then enters the heater, where it is heated to 40-75°C. The heated oil is then rapidly separated into a semi-mist state by a rapidly rotating atomizing nozzle. The water in the oil quickly evaporates into water vapor, which is then continuously separated from the oil by the oil capture structure and drawn into the condenser. The water vapor in the condenser is cooled and then returned to water before being released. The oil in the vacuum separator is then discharged into the fine filter by the oil discharge pump, where particulate impurities are filtered out through filter paper or filter element.

[0006] Preferably, the cyclone generator includes a lower cylinder fixed above the vacuum separator by a flange. The lower end of the lower cylinder has a tapered structure design, that is, the inner diameter of the lower cylinder gradually narrows from bottom to top, so that the airflow rotation speed will continuously accelerate. A fixed cylinder is installed above the lower cylinder by a flange, and a reducer is installed above the fixed cylinder by a flange. The upper end of the reducer is used to install a pipe for connecting the top outlet of the cyclone generator to the inlet of the condenser. Multiple lower spiral guide vanes arranged in a circular array are welded to the lower part of the lower cylinder, and multiple upper spiral guide vanes arranged in a circular array are welded to the upper part of the lower cylinder. The spiral directions of the upper and lower spiral guide vanes are opposite. Due to the reverse rotation of the upper and lower spiral guide vanes, the airflow rotation direction changes suddenly, generating strong turbulent shear. The fine oil droplets that have not yet been separated cannot follow the sudden change in airflow direction due to inertia and are thrown back to the oil capture structure, achieving secondary capture and thus achieving a good separation effect.

[0007] Preferably, the oil capture structure includes a conical cylinder, the upper end of the outer ring of the conical cylinder is integrally formed with a widened part, and the lower end of the conical cylinder has a ring array of notches. A filter screen is fixed in the notch. The filter screen is made of 3-5 layers of stainless steel wire mesh with different mesh counts nested and sintered to form a microstructure with three-dimensional pores, which ensures strength and provides a huge effective capture area. At the same time, through nano-level spraying or chemical etching, the surface of the stainless steel wire has superhydrophobic and oleophilic properties, which means that oil droplets are very easy to spread on its surface, while water vapor is difficult to condense, thus preferentially capturing oil and promoting its rapid agglomeration into a film and flowing away. The lower center of the conical cylinder has a downward protruding part forming a cylindrical mounting sleeve. A collection hopper is fixed to the outer surface of the mounting sleeve, and the collection hopper is used to collect the oil flowing down the surface of the filter screen.

[0008] Preferably, a guide cylinder is welded to the middle of the fixed cylinder, and the upper half of the conical cylinder is slidably inserted into the guide cylinder. A plurality of compression springs arranged in a ring array are fixed on the lower surface of the widened part. The compression springs push the conical cylinder upward. The other end of the compression spring is connected to the upper surface of the fixed cylinder. Piston rings are provided on the outer ring surface of the upper half of the conical cylinder and the outer ring surface of the widened part. The conical cylinder and the widened part can be slidably connected to the inner wall of the guide cylinder and the fixed cylinder through the piston rings, which can improve the sealing between them and prevent liquid penetration.

[0009] Preferably, the scraping structure includes a rotating bushing rotatably mounted on the mounting sleeve via a bearing. The outer surface of the rotating bushing is fixed with a plurality of scrapers arranged in a ring array. The scrapers are equipped with polytetrafluoroethylene scraping blades, which are in close contact with the filter screen surface. When the rotating bushing drives the scrapers to rotate, the rotating and tightly attached scraping blades will scrape away the oil stains adhering to the filter screen surface, thus preventing the filter screen mesh from becoming clogged.

[0010] Preferably, the rotating bushing has a lifting cavity formed through its upper and lower parts. The adaptive sensing structure includes a drive shaft that is slidably installed in the mounting sleeve. The lower end of the drive shaft is inserted into the lifting cavity of the rotating bushing. A drive piston is fixed below the outer ring surface of the drive shaft. The drive piston is sealed and slidably connected to the inner wall of the lifting cavity. A sealing cover is fixed to the bottom of the conical cylinder by screws. The upper end of the drive shaft extends into the sealing cover. A preload spring is fixed to the upper end of the drive shaft. The top of the preload spring abuts against the top of the inner wall of the sealing cover. The preload spring causes the drive shaft to have a downward tendency.

[0011] Preferably, the inner ring surface of the mounting sleeve is provided with a plurality of lifting grooves arranged in a circumferential array, and the outer ring surface of the drive shaft is fixed with a plurality of lifting sliders arranged in a circumferential array. The lifting sliders slide up and down and are inserted into the lifting grooves to guide the drive shaft, so that the drive shaft can only slide up and down inside the mounting sleeve and the lifting cavity, but cannot rotate.

[0012] Preferably, the inner wall of the lifting cavity of the rotating bushing is provided with multiple rotating grooves arranged in an annular array. The rotating grooves are designed in a spiral structure. Multiple driving rollers arranged in an annular array are fixed on the outer surface of the drive shaft. The multiple driving rollers are slidably inserted into the multiple rotating grooves. During the up and down movement of the drive shaft, the driving rollers will also move up and down in the rotating grooves along with the drive shaft, thereby causing the rotating bushing to rotate accordingly. The scraper located on the rotating bushing will rotate accordingly, thereby scraping and cleaning the surface of the filter screen.

[0013] The beneficial effects of this invention are: 1. By installing a cyclone generator above the vacuum separator, and the cyclone generator having upper and lower spiral guide vanes inside, with the lower spiral guide vanes and the upper spiral guide vanes being distributed in opposite directions, the mixed airflow forms a high-speed rotating and rising cyclone after passing through the guide vanes. Due to the reverse rotation of the guide vanes, strong turbulent shearing is generated, causing the small oil droplets that were not captured in the initial separation to be unable to follow the rapid change in airflow direction due to inertia and to be thrown back to the oil capture structure, thus achieving secondary capture of oil mist. This significantly improves the capture effect of small oil droplets, effectively improves the overall oil-water separation efficiency, and reduces the loss of oil with water vapor.

[0014] 2. By sliding the upper part of the conical cylinder into the guide cylinder of the cyclone generator fixed cylinder, the compression spring on the lower surface of the widened part pushes the conical cylinder upward. The impact generated by the high-speed flow of air will cause the conical cylinder to vibrate, causing the filter screen to produce high-frequency micro-vibration. This can effectively prevent the oil film from being too thick and clogging the mesh, keeping the oil film thin and sliding smoothly. It can also promote the collision and merging of small oil droplets, accelerate the oil droplet aggregation process, and further improve the oil capture efficiency.

[0015] 3. By linking the oil capture structure, scraping structure, and adaptive sensing structure, when the filter screen becomes clogged due to oil, the internal air pressure of the cyclone generator increases, automatically pushing the drive shaft of the adaptive sensing structure up and down. Through the cooperation of the drive roller and the spiral rotating groove, the rotating bushing and scraper rotate. The PTFE scraping blade on the scraper closely adheres to the surface of the filter screen to remove the oil. After the filter screen is cleaned, the drive shaft resets under the action of the pre-tension spring, and the scraper also returns to its original position. This adaptive cleaning structure requires no manual intervention and can automatically trigger the cleaning action according to the actual clogging state of the filter screen, completely solving the problem of traditional equipment requiring shutdown for manual cleaning when the filter screen is clogged. This ensures the continuous and stable operation of the equipment and reduces manual maintenance costs. Attached Figure Description

[0016] Figure 1 This is a front view of an oil vapor recovery device proposed in this invention; Figure 2 for Figure 1 Exploded view of the cyclone generator and vacuum separator; Figure 3 for Figure 2 Schematic diagram of the internal structure of a vortex generator; Figure 4 for Figure 3 The front view in the middle; Figure 5 for Figure 3 Schematic diagram of the oil capture structure and scraping structure; Figure 6 for Figure 5 Mid-section schematic diagram; Figure 7for Figure 6 Enlarged view of a portion of the image; Figure 8 for Figure 7 Exploded view of the adaptive sensing structure and the scraping structure.

[0017] Numbering on the map: 1. Pre-filter; 2. Heater; 3. Vacuum separator; 4. Swirl generator; 41. Lower cylinder; 411. Lower helical guide vane; 412. Upper helical guide vane; 42. Fixed cylinder; 43. Variable diameter cylinder; 5. Fine filter; 6. Condenser; 7. Oil capture structure; 71. Conical cylinder; 711. Widened section; 72. Filter screen; 73. Compression spring; 74. Collection hopper; 75. Mounting sleeve; 751. Lifting chute; 8. Scraping structure; 81. Rotating bushing; 811. Rotating groove; 812. Lifting cavity; 82. Scraper; 9. Adaptive sensing structure; 91. Drive shaft; 911. Lifting slider; 912. Drive roller; 92. Drive piston; 93. Preload spring; 94. Sealing cover. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Reference Figure 1 — Figure 8 An oil vapor recovery device includes a primary filter 1, a heater 2 at the right end of the primary filter 1, the outlet of the primary filter 1 being connected to the inlet of the heater 2 via a pipe and an oil pump, the outlet of the heater 2 being connected to the inlet of a vacuum separator 3 via a pipe, an atomizing nozzle being installed at the top inside the vacuum separator 3 via a pipe, the lower outlet of the vacuum separator 3 being connected to a fine filter 5 via a pipe and an oil pump, a cyclone generator 4 being installed at the top of the vacuum separator 3 via a flange, an oil capture structure 7 for oil-water separation being installed inside the cyclone generator 4, a scraping structure 8 for cleaning the surface of the oil capture structure 7 being installed on the oil capture structure 7, an adaptive sensing structure 9 for driving the scraping structure 8 being installed inside the scraping structure 8, the outlet of the top of the cyclone generator 4 being connected to the inlet of a condenser 6 via a pipe, and the outlet of the condenser 6 being connected to a vacuum pump via a pipe. The vacuum pump extracts the air from the vacuum separator 3, creating a vacuum. At this time, the external oil enters the primary filter 1 through the inlet pipe under atmospheric pressure, initially removing larger particles. Then, the oil enters the heater 2 and is heated to 40-75°C. The heated oil is separated into a semi-mist state by the rapid rotation of the atomizing nozzle. The water in the oil evaporates rapidly into water vapor, which is then continuously separated from the oil by the oil capture structure 7 by the vacuum pump and drawn into the condenser 6. The water vapor entering the condenser 6 is cooled and then returned to water and released. The oil in the vacuum separator 3 is discharged into the fine filter 5 by the oil discharge pump, where particulate impurities are filtered out through filter paper or filter element.

[0020] Reference Figure 2 — Figure 4 The cyclone generator 4 includes a lower cylinder 41 fixed above the vacuum separator 3 by a flange. The lower end of the lower cylinder 41 has a tapered structure design, that is, the inner diameter of the lower cylinder 41 gradually narrows from bottom to top, so that the airflow rotation speed will continuously accelerate. A fixed cylinder 42 is installed above the lower cylinder 41 by a flange. A reducer 43 is installed above the fixed cylinder 42 by a flange. The upper end of the reducer 43 is used to install a pipe for connecting the top outlet of the cyclone generator 4 to the inlet of the condenser 6. Multiple lower spiral guide vanes 411 arranged in a circular array are welded to the lower part of the lower cylinder 41, and multiple upper spiral guide vanes 412 arranged in a circular array are welded to the upper part of the lower cylinder 41. The spiral direction of the upper spiral guide vanes 412 is opposite to that of the lower spiral guide vanes 411. Water vapor carrying oil mist enters the lower cylinder 41 from the bottom. The fixed lower spiral guide vanes 411 and upper spiral guide vanes 412 force it to become a high-speed rotating upward swirling flow. Under the action of strong centrifugal force, the high-speed rotating oil mist particles are thrown towards the surface of the oil capture structure 7, so that the oil and water vapor are separated. As the upper spiral guide vane 412 and the lower spiral guide vane 411 rotate in opposite directions, the airflow rotation direction changes suddenly, generating strong turbulent shear. The fine oil droplets that have not yet been separated cannot follow the sudden change in airflow direction due to inertia and are thrown back to the oil capture structure 7, achieving secondary capture and thus achieving a good separation effect.

[0021] Reference Figure 3 — Figure 7The oil capture structure 7 includes a conical cylinder 71. The upper part of the outer ring of the conical cylinder 71 is integrally formed with a widened part 711. The lower end of the conical cylinder 71 has a ring array of notches. A filter screen 72 is fixed in the notches. The filter screen 72 is made of 3-5 layers of stainless steel wire mesh with different mesh counts nested and sintered to form a microstructure with three-dimensional pores. This ensures strength and provides a huge effective capture area. At the same time, through nano-level spraying or chemical etching, the surface of the stainless steel wire has superhydrophobic and oleophilic properties. This means that oil droplets are very easy to spread on its surface, while water vapor is difficult to condense. Thus, the oil is preferentially captured and promoted to quickly coalesce into a film and flow away. The lower center of the conical cylinder 71 has a downward protruding part forming a cylindrical structure mounting sleeve 75. The outer surface of the mounting sleeve 75 is fixed with a collecting hopper 74, which is used to collect the oil flowing down the surface of the filter screen 72.

[0022] Reference Figure 3 , Figure 4 A guide cylinder is welded to the middle of the fixed cylinder 42. The upper half of the conical cylinder 71 is slidably inserted into the guide cylinder. Multiple compression springs 73 arranged in a ring array are fixed on the lower surface of the widened part 711. The compression springs 73 push the conical cylinder 71 upward. The other end of the compression springs 73 is connected to the upper surface of the fixed cylinder 42. Piston rings are provided on the outer ring surface of the upper half of the conical cylinder 71 and the outer ring surface of the widened part 711. The conical cylinder 71 and the widened part 711 can slide vertically and vertically with the guide cylinder and the inner wall of the fixed cylinder 42 through the piston rings, which can improve the sealing between them and prevent liquid penetration. The compression spring 73, when used in conjunction with the high-speed airflow, causes the conical cylinder 71 to vibrate, which in turn causes the filter screen 72 to vibrate at a high frequency. This greatly prevents the oil film from becoming too thick and clogging the mesh, keeping the oil film thin and allowing it to slide smoothly. At the same time, the vibration promotes the collision and merging of small oil droplets, accelerating the coalescence process.

[0023] Reference Figure 3 — Figure 8 The scraping structure 8 includes a rotating bushing 81 that is rotatably mounted on the mounting sleeve 75 via a bearing. Multiple scrapers 82 arranged in a ring array are fixed on the outer surface of the rotating bushing 81. Polytetrafluoroethylene scraping blades are installed on the scrapers 82. The scraping blades are in close contact with the surface of the filter screen 72. When the rotating bushing 81 drives the scrapers 82 to rotate, the rotating and tightly attached scraping blades will scrape away the oil stains adhering to the surface of the filter screen 72, thus preventing the filter screen 72 mesh from becoming clogged.

[0024] Reference Figure 6 - Figure 8The rotating bushing 81 forms a lifting cavity 812 through the top and bottom. The adaptive sensing structure 9 includes a drive shaft 91 that is slidably installed in the mounting sleeve 75. The lower end of the drive shaft 91 is inserted into the lifting cavity 812 of the rotating bushing 81. A drive piston 92 is fixed below the outer ring surface of the drive shaft 91. The drive piston 92 is sealed and slidably connected to the inner wall of the lifting cavity 812. A sealing cover 94 is fixed to the bottom of the conical cylinder 71 by screws. The upper end of the drive shaft 91 extends into the sealing cover 94. A preload spring 93 is fixed to the upper end of the drive shaft 91. The top end of the preload spring 93 abuts against the top end of the inner wall of the sealing cover 94. The preload spring 93 causes the drive shaft 91 to have a downward tendency. When the mesh of the filter screen 72 on the conical cylinder 71 is blocked, the airflow in the vortex generator 4 cannot pass through the surface of the filter screen 72 into the condenser 6. This will cause the air pressure inside the vortex generator 4 to rise. When the air pressure rises to a certain level, that is, when the air pressure inside the vortex generator 4 is higher than the sum of the elastic force of the air pressure preload spring 93 between the sealing cover 94 and the drive piston 92, the drive piston 92 will be pushed upward, and the drive shaft 91 will move upward as a whole.

[0025] Reference Figure 7 , Figure 8 The inner surface of the mounting sleeve 75 is provided with multiple lifting grooves 751 arranged in a circumferential array. The outer surface of the drive shaft 91 is fixed with multiple lifting sliders 911 arranged in a circumferential array. The lifting sliders 911 slide up and down and are inserted into the lifting grooves 751 to guide the drive shaft 91, so that the drive shaft 91 can only slide up and down inside the mounting sleeve 75 and the lifting cavity 812, and cannot rotate.

[0026] Reference Figure 8 The inner wall of the lifting cavity 812 of the rotating bushing 81 is provided with multiple rotating grooves 811 arranged in a ring array. The rotating grooves 811 are designed in a spiral structure. Multiple driving rollers 912 arranged in a ring array are fixed on the outer surface of the drive shaft 91. The multiple driving rollers 912 are slidably inserted into the multiple rotating grooves 811. During the up and down movement of the drive shaft 91, the driving rollers 912 will also move up and down in the rotating grooves 811 along with the drive shaft 91, thereby causing the rotating bushing 81 to rotate accordingly. The scraper 82 located on the rotating bushing 81 will rotate accordingly, thereby scraping and cleaning the surface of the filter screen 72.

[0027] Working principle: The waste oil pipe is connected to the inlet of the primary filter 1 through a pipeline. After the equipment is started, the air inside the vacuum separator 3 is first extracted by the pneumatic vacuum pump to make the chamber a vacuum state. Under the dual force of atmospheric pressure and oil pump, the external oil enters the primary filter 1 through the inlet pipe to complete the initial removal of larger particulate impurities in the oil and reduce the risk of blockage in subsequent pipelines and structures. After initial filtration, the oil is pumped through a pipeline into heater 2, where it is heated to a suitable temperature of 40-75°C. The heated oil then continues to flow through a pipeline into vacuum separator 3, where it is separated into a semi-mist state by the rapidly rotating atomizing nozzle at the top. The water in the oil evaporates rapidly into water vapor in this state, and the water vapor carries some of the oil mist upwards into the cyclone generator 4 connected to the flange at the top of vacuum separator 3. The vacuum pump continuously generates suction, driving the mixed airflow to complete the subsequent separation and transport.

[0028] Water vapor carrying oil mist enters the cavity from the bottom of the lower cylinder 41 of the cyclone generator 4. The lower end of the lower cylinder 41 has a conical structure with the inner diameter gradually narrowing from bottom to top, which can continuously accelerate the rotation speed of the airflow. The lower cylinder 41 has a circular array of lower spiral guide vanes 411 and upper spiral guide vanes 412 welded to the upper and lower sides respectively. The spiral directions of the two are opposite. When the mixed airflow passes through, it will be forced to change into a high-speed rotating and rising cyclone. Under the action of strong centrifugal force, the high-speed rotating oil mist particles will be directly thrown towards the surface of the oil capture structure 7 inside the cyclone generator 4, realizing the initial separation of oil and water vapor. At the same time, because the rotation directions of the upper spiral guide vane 412 and the lower spiral guide vane 411 are reversed, the rotation direction of the airflow will suddenly change, which will generate strong turbulent shear. The fine oil droplets that have not yet been separated cannot follow the sudden change in airflow direction due to their own inertia, and will be thrown back to the oil capture structure 7 to complete the secondary capture of oil mist, which greatly improves the oil-water separation effect. Since the upper half of the conical cylinder 71 is slidably inserted into the guide cylinder of the fixed cylinder 42 of the cyclone generator 4, the compression spring 73 on the lower surface of the widened part 711 pushes the conical cylinder 71 upward. The impact generated by the high-speed flow of air will cause the conical cylinder 71 to vibrate, causing the filter screen 72 to produce high-frequency micro-vibration. This can effectively prevent the oil film from being too thick and clogging the mesh, keeping the oil film thin and sliding smoothly. It can also promote the collision and merging of small oil droplets, accelerate the oil droplet aggregation process, and further improve the oil capture efficiency. After the water vapor is separated from the oil mist by the oil capture structure 7, it will be drawn into the condenser 6 under the continuous suction of the vacuum pump. After being cooled in the condenser 6, the water vapor will be reduced back to liquid water and discharged from the equipment, thus completing the complete separation of water vapor and oil. The oil that has been separated from the oil mist in the vacuum separator 3 will be transported to the fine filter 5 by the oil discharge pump. The oil will be filtered out by the filter paper or filter element to remove particulate impurities, thus achieving fine filtration and purification of the oil and completing the entire process of oil vapor recovery and oil treatment.

[0029] When the mesh of filter screen 72 becomes clogged due to oil stains, the airflow in the cyclone generator 4 cannot pass smoothly through filter screen 72 into the condenser 6, which will cause the internal air pressure of the cyclone generator 4 to rise. When the air pressure exceeds the sum of the air pressure between the sealing cover 94 and the drive piston 92 and the elastic force of the pre-tension spring 93, the drive piston 92 will be pushed upward, causing the drive shaft 91 to move upward as a whole. The drive roller 912 on the outer ring of the drive shaft 91 will slide upward in the spiral rotating groove 811 of the lifting chamber 812 of the rotating bushing 81, thereby causing the rotating bushing 81 to rotate. The rotating bushing 81 will then drive the scraper 82 to rotate synchronously. The scraping blade on the scraper 82 will rotate closely against the surface of the filter screen 72, thoroughly scraping away the oil stains attached to the filter screen 72, effectively preventing the filter screen 72 from becoming clogged, restoring the separation efficiency of the equipment, and ensuring the continuous operation of the equipment. Once the surface of the filter screen 72 is cleaned, the airflow can pass through smoothly. The drive shaft 91 moves downward and returns to its original position under the action of the preload spring 93. The rotating bushing 81 and the scraper 82 will also return to their original positions.

[0030] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0031] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0032] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A device for recovering oil vapor, characterized in that, The system includes a primary filter (1), a heater (2) is provided at the right end of the primary filter (1), the outlet end of the primary filter (1) is connected to the inlet end of the heater (2) through a pipe and an oil pump, the outlet end of the heater (2) is connected to the inlet end of the vacuum separator (3) through a pipe, an atomizing nozzle is installed inside the vacuum separator (3) and a pipe is connected to the atomizing nozzle, the lower outlet of the vacuum separator (3) is connected to the fine filter (5) through a pipe and an oil pump, a cyclone generator (4) is installed at the top of the vacuum separator (3) through a flange, an oil capture structure (7) for oil-water separation is installed inside the cyclone generator (4), a scraping structure (8) for cleaning its surface is installed on the oil capture structure (7), an adaptive sensing structure (9) for driving its operation is installed inside the scraping structure (8), the outlet end of the top of the cyclone generator (4) is connected to the inlet of the condenser (6) through a pipe, and the outlet end of the condenser (6) is connected to the vacuum pump through a pipe.

2. The oil vapor recovery device according to claim 1, characterized in that, The cyclone generator (4) includes a lower cylinder (41) fixed above the vacuum separator (3) by a flange, a fixed cylinder (42) is installed above the lower cylinder (41) by a flange, and a variable diameter (43) is installed above the fixed cylinder (42) by a flange. The lower cylinder (41) has multiple lower spiral guide vanes (411) arranged in a circular array welded to the lower part of the interior, and multiple upper spiral guide vanes (412) arranged in a circular array welded to the upper part of the interior. The spiral directions of the upper spiral guide vanes (412) and the lower spiral guide vanes (411) are opposite.

3. The oil vapor recovery device according to claim 2, characterized in that, The oil capture structure (7) includes a conical cylinder (71), the upper end of the outer ring of the conical cylinder (71) is integrally formed with a widened part (711), the lower end of the conical cylinder (71) is provided with a ring array of notches, a filter screen (72) is fixed in the notches, and a cylindrical mounting sleeve (75) is formed on the downward protruding part at the center of the lower end of the conical cylinder (71), and a collection hopper (74) is fixed on the outer ring surface of the mounting sleeve (75).

4. The oil vapor recovery device according to claim 3, characterized in that, A guide tube is welded in the middle of the fixed cylinder (42). The upper half of the conical cylinder (71) is slidably inserted into the guide tube. A plurality of compression springs (73) arranged in a ring array are fixed on the lower surface of the widened part (711). The other end of the compression spring (73) is connected to the upper surface of the fixed cylinder (42).

5. The oil vapor recovery device according to claim 4, characterized in that, The scraping structure (8) includes a rotating bushing (81) that is rotatably mounted on the mounting sleeve (75) via a bearing. The outer ring surface of the rotating bushing (81) is fixed with a plurality of scrapers (82) arranged in a ring array. The scrapers (82) are equipped with polytetrafluoroethylene scraping blades, which are in close contact with the surface of the filter screen (72).

6. The oil vapor recovery device according to claim 5, characterized in that, The rotating bushing (81) forms a lifting cavity (812) through the top and bottom. The adaptive sensing structure (9) includes a drive shaft (91) that is slidably installed in the mounting sleeve (75). The lower end of the drive shaft (91) is inserted into the lifting cavity (812) of the rotating bushing (81). A drive piston (92) is fixed below the outer ring surface of the drive shaft (91). The drive piston (92) is sealed and slidably connected to the inner wall of the lifting cavity (812). The bottom of the conical cylinder (71) is fixed with a sealing cover (94) by screws. The upper end of the drive shaft (91) extends into the sealing cover (94). A preload spring (93) is fixed to the upper end of the drive shaft (91). The top end of the preload spring (93) abuts against the top end of the inner wall of the sealing cover (94).

7. The oil vapor recovery device according to claim 6, characterized in that, The inner ring surface of the mounting sleeve (75) is provided with a plurality of lifting grooves (751) arranged in a circular array, and the outer ring surface of the drive shaft (91) is fixed with a plurality of lifting sliders (911) arranged in a circular array. The lifting sliders (911) slide up and down and are inserted into the lifting grooves (751).

8. The oil vapor recovery device according to claim 7, characterized in that, The inner wall of the lifting cavity (812) of the rotating bushing (81) is provided with a plurality of rotating grooves (811) arranged in a ring array. The rotating grooves (811) are designed in a spiral structure. The outer surface of the drive shaft (91) is fixed with a plurality of driving rollers (912) arranged in a ring array. The plurality of driving rollers (912) are slidably inserted into the plurality of rotating grooves (811).

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