Solvent purification method for waste lubricating oil regeneration device

Abstract

The application provides a waste lubricating oil regeneration device for solvent purification method, which comprises a purification barrel body with a purification cylinder cavity; a circulating cylinder body with an upper and lower through middle cylinder cavity, the top end and the bottom end of the middle cylinder cavity are communicated with the purification cylinder cavity; a sedimentation mechanism is arranged in the middle cylinder cavity; an annular cavity is formed between the circulating cylinder body and the purification barrel body; a fluid circulation mechanism is arranged for making the oil in the annular cavity flow from the top end of the middle cylinder cavity, and the oil at the bottom end of the circulating cylinder body is stratified, and then the upper layer of the oil which is not fully settled flows from the bottom end of the middle cylinder cavity into the annular cavity. The waste lubricating oil regeneration device for solvent purification method provided by the application promotes the continuous circulation of the oil in the fluid circulation mechanism, so that the oil which is not fully settled can enter the treatment process again, and the generation of the intermediate layer is reduced. The sedimentation cavity formed at the bottom end of the circulating cylinder body provides favorable conditions for the stratification of the oil, avoids the mixing between the phases, and reduces the loss of the base oil.

Description

Technical Field

[0001] This invention belongs to the field of waste lubricating oil regeneration technology, specifically relating to a waste lubricating oil regeneration device using solvent purification method. Background Technology

[0002] Solvent purification is a commonly used physicochemical method in the regeneration of waste lubricating oil. Its core principle is to utilize the differences in solubility of different components (base oil, additives, impurities, etc.) in lubricating oil by solvents. Through steps such as dissolution, separation, and purification, the colloids, asphaltenes, mechanical impurities, water, and some additives in the waste lubricating oil are removed, thereby restoring the performance of the lubricating oil.

[0003] In the existing technology, during the sedimentation separation stage of solvent purification, waste lubricating oil contains surface-active substances such as gums, asphaltenes, and soaps. When mixed with solvent, these substances easily form stable emulsions, making it difficult to clearly separate the oil phase, solvent phase, and impurity phase. Furthermore, an "intermediate layer" (a transition layer containing a large amount of emulsion) is prone to appear, which not only affects the separation effect but also causes the loss of base oil, resulting in poor adaptability and practicality. Summary of the Invention

[0004] This invention provides a waste lubricating oil regeneration device for solvent purification, which aims to solve the problems of poor separation effect and large base oil loss in the sedimentation separation stage of existing solvent purification methods.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is: to provide a waste lubricating oil regeneration device for solvent purification, comprising: A purification barrel body has a purification chamber, and the purification barrel body is provided with an inlet and an outlet; A circulation cylinder is coaxially fixed inside the purification cylinder cavity. The circulation cylinder has a vertically penetrating intermediate cylinder cavity, the top and bottom of which are connected to the purification cylinder cavity. A settling mechanism is provided in the intermediate cylinder cavity. An annular cavity is formed between the circulation cylinder and the purification cylinder, and a settling cavity is formed below the circulation cylinder. A fluid circulation mechanism is provided inside the purification cylinder cavity. The fluid circulation mechanism is used to allow the oil in the annular cavity to flow in from the top of the intermediate cylinder cavity, and to form oil stratification at the bottom of the circulation cylinder. Then, the upper layer of oil that has not settled sufficiently flows in from the bottom of the intermediate cylinder cavity into the annular cavity.

[0006] In one possible implementation, the fluid circulation mechanism includes: The internal circulation structure has two internal circulation ports, which are vertically spaced at the upper and lower ends of the circulation cylinder. The internal circulation structure is used to allow waste oil in the annular cavity to flow in from the upper internal circulation port and then flow out from the lower internal circulation port. The external circulation structure is provided in multiple ways. Each external circulation structure is arranged vertically at intervals in the annular cavity and located between two internal circulation ports. Each external circulation structure is fixedly connected to the outer wall of the circulation cylinder. Each external circulation structure is used to transport waste oil in the annular cavity from bottom to top.

[0007] In one possible implementation, the inner loop structure includes: Two flow guide rings are provided, each flow guide ring is correspondingly disposed on the corresponding end of the circulation cylinder, the axis of each flow guide ring is collinear with the axis of the circulation cylinder, each flow guide ring has multiple flow guide inlets and multiple flow guide outlets, the corresponding flow guide inlets and corresponding flow guide outlets together form a flow guide channel, each flow guide channel is arranged circumferentially at intervals along the axis of the circulation cylinder, and each flow guide channel is inclined; Two guide impellers are provided, each of which is rotatably mounted on a corresponding guide ring, and the axis of rotation is collinear with the axis of the guide ring; The drive shaft is arranged vertically and is poweredly connected to the two guide impellers; A driver for driving the drive shaft to rotate; The end faces of the two guide rings located at their guide outlets are arranged opposite each other; The radius of the annulus formed by each of the flow outlets is smaller than the radius of the annulus formed by each of the flow inlets.

[0008] In one possible implementation, each of the outer loop structures includes: A fixing ring is sleeved on the circulating cylinder and spaced apart from the circulating cylinder. The axis of the fixing ring is collinear with the axis of the circulating cylinder. The fixing ring is provided with a plurality of external circulation ports that pass through in the vertical direction. Each of the external circulation ports is arranged circumferentially at intervals along the axis of the fixing ring. Multiple connecting rods are provided, and each connecting rod is arranged circumferentially at intervals along the axis of the fixed ring. One end of each connecting rod is connected to the outer wall of the circulating cylinder, and the other end of each connecting rod extends horizontally outward and connects to the inner wall of the fixed ring. Multiple miniature water pumps are provided, each miniature water pump is configured to correspond one-to-one with each of the external circulation ports, and each miniature water pump is used to transport waste oil in the annular cavity from bottom to top.

[0009] In one possible implementation, each of the external circulation ports of the fixed ring is provided with a filter screen.

[0010] In one possible implementation, the settling mechanism includes a plurality of settling plates, each settling plate being disposed within the intermediate cylinder cavity and fixedly connected to the circulating cylinder body. Each settling plate is spirally wound around the intermediate cylinder cavity along the axis of the circulating cylinder body, and each settling plate is inclined.

[0011] In one possible implementation, the inner circulation structure further includes an oil shield disposed on the drive.

[0012] In one possible implementation, a plurality of connecting cantilever arms are uniformly provided on the outer wall of the circulation cylinder, and each connecting cantilever arm is respectively connected to the purification barrel and the circulation cylinder.

[0013] In one possible implementation, the purification tank includes: The barrel body has the purification chamber with an open top, and the discharge port is provided at the bottom of the barrel body; A cover is provided over the opening of the barrel body, and the feed inlet is provided on the cover. The support legs are provided in multiples, and each support leg is arranged circumferentially on the barrel body along the axis of the purification cylinder.

[0014] In this implementation, compared to existing technologies, the fluid circulation mechanism continuously circulates the oil, allowing insufficiently settled oil to re-enter the treatment process and reducing the formation of intermediate layers. The settling chamber formed at the bottom of the circulation cylinder provides favorable conditions for the stratification of the oil, solvent, and impurity phases, preventing mixing between the phases and thus reducing the loss of base oil. The circulating flow of the oil enhances the contact opportunities between each component and the solvent, which is beneficial for the dissolution and separation of impurities, improving the efficiency and quality of the regeneration treatment. Attached Figure Description

[0015] Figure 1 Schematic diagram of the internal structure of the waste lubricating oil regeneration device for solvent purification provided in this embodiment of the invention. Figure 1 ; Figure 2 Schematic diagram of the internal structure of the waste lubricating oil regeneration device for solvent purification provided in this embodiment of the invention. Figure 2 ; Figure 3 for Figure 2 Enlarged structural diagram at point A; Explanation of reference numerals in the attached figures: 10. Purification tank body; 11. Tank body; 12. Cover; 13. Support leg; 20. Circulation tank; 21. Connecting cantilever; 30. Fluid circulation mechanism; 31. Internal circulation structure; 311. Guide ring; 312. Guide impeller; 313. Drive shaft; 314. Driver; 315. Oil shield; 32. External circulation structure; 321. Fixing ring; 322. Connecting rod; 323. Miniature water pump; 40. Settling mechanism; 41. Settling plate. Detailed Implementation

[0016] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0017] It should be noted that the terms "length", "width", "height", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", and "tail" 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 the present 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 the present invention.

[0018] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part of a structure. They can refer to a mechanical connection or an electrical connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0019] 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. Additionally, "multiple" and "several" mean two or more, unless otherwise explicitly specified.

[0020] Please refer to the following: Figures 1 to 3The waste lubricating oil regeneration device for solvent purification provided by this invention will now be described. The waste lubricating oil regeneration device for solvent purification includes a purification tank 10, a circulation cylinder 20, and a fluid circulation mechanism 30. The purification tank 10 has a purification cavity, and is provided with an inlet and an outlet. The circulation cylinder 20 is coaxially fixed inside the purification cavity, and has a vertically penetrating intermediate cavity, the top and bottom of which are connected to the purification cavity. A settling mechanism 40 is provided in the intermediate cavity. An annular cavity is formed between the circulation cylinder 20 and the purification tank 10, and a settling cavity is formed below the circulation cylinder 20. The fluid circulation mechanism 30 is disposed inside the purification cavity. The fluid circulation mechanism 30 is used to allow the oil in the annular cavity to flow in from the top of the intermediate cavity, and to create oil stratification at the bottom of the circulation cylinder 20, allowing the upper layer of oil that has not settled sufficiently to flow into the annular cavity from the bottom of the intermediate cavity.

[0021] The waste lubricating oil regeneration device for solvent purification provided in this embodiment, compared with the prior art, promotes continuous circulation of oil through the fluid circulation mechanism 30, allowing insufficiently settled oil to re-enter the processing flow and reducing the formation of intermediate layers. The settling chamber formed at the bottom of the circulation cylinder 20 provides favorable conditions for the stratification of the oil phase, solvent phase, and impurity phase, avoiding mixing between the phases and thus reducing the loss of base oil. The circulating flow of the oil enhances the contact opportunities between each component and the solvent, which is beneficial for the dissolution and separation of impurities, improving the efficiency and quality of the regeneration process.

[0022] The circulating cylinder 20 can adopt a conical structure with a smaller bottom diameter, which is more conducive to oil stratification. The fluid circulation mechanism 30 can use a single circulation pump instead of the combination of internal and external circulation, and connect the intermediate cylinder cavity and the annular cavity through pipelines to realize the circulation flow of oil.

[0023] In some embodiments, the fluid circulation mechanism 30 described above may employ, for example... Figures 1 to 3 The structure shown. See also Figures 1 to 3 The fluid circulation mechanism 30 includes an inner circulation structure 31 and an outer circulation structure 32. The inner circulation structure 31 has two inner circulation ports, which are vertically spaced at the upper and lower ends of the circulation cylinder 20. The inner circulation structure 31 allows waste oil in the annular cavity to flow in from the upper inner circulation port and out from the lower inner circulation port. Multiple outer circulation structures 32 are provided, each vertically spaced within the annular cavity and located between two inner circulation ports. Each outer circulation structure 32 is fixedly connected to the outer wall of the circulation cylinder 20, and each outer circulation structure 32 is used to transport waste oil in the annular cavity from bottom to top.

[0024] The stable emulsion structure is broken down, promoting the separation of phases. Multiple external circulation structures 32 are arranged vertically at intervals, allowing oil at different heights to be circulated and treated, ensuring uniform treatment. This dual circulation structure improves the circulation efficiency and treatment effect of the oil, reduces the formation of the "intermediate layer," further reduces the loss of base oil, and enhances the practicality of the equipment.

[0025] The two inner circulation ports of the inner circulation structure 31 can be designed with different diameters, with the upper inner circulation port having a larger diameter than the lower inner circulation port, to adjust the circulation volume of the oil. The outer circulation structure 32 can use a screw conveyor instead of the micro water pump 323, using the rotation of the screw blades to transport the oil from bottom to top.

[0026] In some embodiments, the inner loop structure 31 described above can be adopted as follows: Figures 1 to 3 The structure shown. See also Figures 1 to 3 The internal circulation structure 31 includes a guide ring 311, a guide impeller 312, a drive shaft 313, and a driver 314. Two guide rings 311 are provided, each correspondingly positioned at the end of the circulation cylinder 20. The axis of each guide ring 311 is collinear with the axis of the circulation cylinder 20. Each guide ring 311 has multiple guide inlets and multiple guide outlets, which together form a guide channel. These guide channels are arranged annularly at intervals along the axis of the circulation cylinder 20, and each guide channel is inclined. Two guide impellers 312 are provided, each rotatably mounted on a corresponding guide ring 311, with its rotation axis collinear with the axis of the guide ring 311. The drive shaft 313 is vertically positioned and poweredly connected to the two guide impellers 312. The driver 314 drives the drive shaft 313 to rotate.

[0027] The two guide rings 311 are positioned opposite each other at their respective end faces where the guide outlets are located.

[0028] The radius of the ring formed by each flow outlet is smaller than the radius of the ring formed by each flow inlet.

[0029] The inclined guide channel of the guide ring 311 guides the oil to flow in a specific direction, reducing energy loss during oil flow and improving circulation efficiency. The guide impeller 312 rotates under the drive of the driver 314, providing power for the oil flow and enhancing the circulation intensity. The guide outlet end faces of the two guide rings 311 are positioned opposite each other, causing convection in the middle region of the circulating oil, increasing the interaction between the oils and helping to break up emulsions. The annular radius formed by the guide outlets is smaller than that of the guide inlets, causing a certain velocity change in the oil during flow, generating turbulence, and further promoting the separation of phases. The arrangement of the drive shaft 313 and the driver 314 enables the synchronous rotation of the two guide impellers 312, ensuring the stability and consistency of the internal circulation and improving the processing effect of the device.

[0030] The tilt angle of the guide channel can be adjusted according to the viscosity of the oil; the angle increases when the viscosity is high. The guide impeller 312 can be replaced with a turbine structure, which generates stronger suction and thrust through the rotation of the turbine, enhancing the circulation power of the oil.

[0031] In some embodiments, the outer circulation structure 32 described above can be adopted as follows: Figures 1 to 3 The structure shown. See also Figures 1 to 3 Each external circulation structure 32 includes a fixed ring 321, a connecting rod 322, and a micro water pump 323. The fixed ring 321 is sleeved on the circulation cylinder 20 and spaced apart from it. The axis of the fixed ring 321 is collinear with the axis of the circulation cylinder 20. The fixed ring 321 has multiple vertically penetrating external circulation ports, which are spaced annularly along the axis of the fixed ring 321. Multiple connecting rods 322 are provided, spaced annularly along the axis of the fixed ring 321. One end of each connecting rod 322 is connected to the outer wall of the circulation cylinder 20, and the other end extends horizontally outward to connect to the inner wall of the fixed ring 321. Multiple micro water pumps 323 are provided, each corresponding to one of the external circulation ports. Each micro water pump 323 is used to transport waste oil from bottom to top within the annular cavity.

[0032] The fixed ring 321 provides a stable mounting base for the micro water pump 323. The connecting rod 322 connects the fixed ring 321 to the circulation cylinder 20, ensuring the stability of the external circulation structure 32 within the annular cavity. Multiple micro water pumps 323 are arranged at intervals along the fixed ring 321, enabling them to uniformly extract oil from different locations within the annular cavity, resulting in a uniform upward flow of oil and preventing localized oil stagnation. The external circulation structure 32, located between the two internal circulation ports, transports oil from the lower part of the annular cavity to the upper part, forming a complete circulation path in conjunction with the internal circulation structure 31. This allows insufficiently settled oil to promptly enter the internal circulation structure 31 for further processing. This structural design enhances the overall circulation effect of the oil, helps break down the stability of the emulsion, promotes the stratification of the oil phase, solvent phase, and impurity phase, and improves the recovery rate of the base oil.

[0033] In some embodiments, the aforementioned retaining ring 321 may be adopted as follows: Figure 3 The structure shown. See also Figure 3 Each external circulation port of the fixed ring 321 is equipped with a filter screen.

[0034] A filter screen is installed on the outer circulation port of the fixed ring 321 to effectively filter larger particulate impurities in the oil, preventing these impurities from entering the micro water pump 323. This avoids damage to the micro water pump 323 due to clogging, extends its service life, and reduces the maintenance cost of the device. Simultaneously, the filter screen reduces the circulation of impurities within the annular cavity, preventing impurities from promoting the emulsification process of the oil, helping to maintain oil stability and promoting phase stratification. The filter screen does not affect the normal flow of the oil, ensuring the conveying efficiency of the outer circulation structure 32, enabling the device to operate stably for a long time, and enhancing its reliability and practicality.

[0035] The filter screen can be replaced with a filter cartridge, providing higher filtration accuracy and suitable for applications with strict requirements on impurity levels. Alternatively, a separate filter can be installed at the inlet of the miniature water pump 323 to replace the filter screen on the external circulation port.

[0036] In some embodiments, the aforementioned settling mechanism 40 may employ, for example... Figures 1 to 3 The structure shown. See also Figures 1 to 3 The settling mechanism 40 includes multiple settling plates 41, each settling plate 41 is disposed in the intermediate cylinder cavity and fixedly connected to the circulation cylinder 20. Each settling plate 41 is spirally wound around the intermediate cylinder cavity along the axis of the circulation cylinder 20, and each settling plate 41 is inclined.

[0037] The spiral structure causes the oil to flow in a spiral pattern within the intermediate cylinder cavity, increasing oil turbulence and facilitating collision and coagulation of impurities, thus promoting their settling. The inclined design of the settling plate 41 allows settled impurities to slide down to the bottom of the circulation cylinder 20 under gravity, facilitating collection and discharge. The settling mechanism 40 improves oil settling efficiency, reduces impurity content in the oil, avoids the impact of impurities on the separation of the oil and solvent phases, and reduces the possibility of "intermediate layer" formation, thereby improving the purity and recovery rate of the base oil and enhancing the treatment effect of the unit.

[0038] The settling plate 41 can have a corrugated structure to increase the contact area between the oil and the settling plate 41, promoting the adsorption and settling of impurities. The settling plate 41 can be made of an oleophilic material to improve its adsorption capacity for impurities in the oil phase.

[0039] In some embodiments, the inner loop structure 31 described above can be adopted as follows: Figures 1 to 3 The structure shown. See also Figures 1 to 3 The internal circulation structure 31 also includes an oil shield 315, which is mounted on the driver 314.

[0040] An oil shield 315 is installed on the driver 314 of the internal circulation structure 31. This effectively prevents oil from splashing onto the driver 314, avoiding corrosion or short circuits caused by oil on the electrical components of the driver 314, ensuring normal operation of the driver 314, and extending its service life. The oil shield 315 does not affect the heat dissipation performance of the driver 314, ensuring that the driver 314 can operate at a suitable temperature and maintain the stability of its driving performance. The oil shield 315 has a simple structure, is easy to install, and has a low cost, yet it can significantly improve the safety and reliability of the device, enabling the device to operate stably in environments where oil may splash, thus enhancing the practicality of the device.

[0041] The oil shield 315 can be made of transparent material to facilitate observation of the operating status of the driver 314. Alternatively, an oil shield 315 with heat dissipation function can be used to enhance the heat dissipation effect of the driver 314 while preventing oil splashing.

[0042] In some embodiments, the aforementioned circulating cylinder 20 may be adopted as follows: Figures 1 to 3 The structure shown. See also Figures 1 to 3 Multiple connecting arms 21 are evenly provided on the outer wall of the circulation cylinder 20, and each connecting arm 21 is connected to the purification cylinder 10 and the circulation cylinder 20 respectively.

[0043] Multiple connecting cantilever arms 21 are installed on the outer wall of the circulating cylinder 20, connecting the purification tank 10 and the circulating cylinder 20 respectively. This ensures the stable fixation of the circulating cylinder 20 within the purification chamber of the purification tank 10, guaranteeing its stability during operation and preventing shaking or displacement due to oil flow. This also ensures the stability of the oil circulation path and promotes proper oil separation. The connecting cantilever arms 21 are evenly distributed along the outer wall of the circulating cylinder 20, resulting in uniform force distribution, reducing localized stress concentration, and extending its service life. The connecting cantilever arms 21 do not affect oil flow within the annular and intermediate cylinder chambers, ensuring the processing efficiency of the device and enhancing its structural stability and reliability. The connecting cantilever arms 21 can be replaced with support rods, employing a triangular support structure to further enhance the stability of the circulating cylinder 20.

[0044] In some embodiments, the purification tank 10 described above can be adopted as follows: Figure 1 , Figure 2 The structure shown. See also Figure 1 , Figure 2 The purification barrel 10 includes a barrel body 11, a lid 12, and support legs 13. The barrel body 11 has a purification chamber with an open top and a discharge port at the bottom. The lid 12 covers the open part of the barrel body 11 and has a feed port. Multiple support legs 13 are provided, and each support leg 13 is arranged circumferentially on the barrel body 11 along the axis of the purification chamber.

[0045] The purification chamber of the barrel 11 provides sufficient volume for oil processing, and the discharge port at the bottom facilitates the discharge of the processed oil phase, solvent phase, and impurity phase. The cover 12 is placed over the open end of the barrel 11, creating a closed space within the purification chamber to prevent the evaporation of oil and solvent, reducing environmental pollution. It also prevents external impurities from entering the purification chamber, ensuring the purity of the processing. Support legs 13 allow the device to be stably placed on the ground, preventing shaking during operation and enhancing stability. This simple and reasonable structural design facilitates the manufacture, installation, and maintenance of the device, improving its practicality and safety.

[0046] The barrel body 11 can adopt a double-layer structure with an insulation layer in the middle, which is suitable for processing processes that require temperature control.

[0047] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A solvent refining method for regenerating a waste lubricating oil, characterized by, include: A purification barrel body has a purification chamber, and the purification barrel body is provided with an inlet and an outlet; A circulation cylinder is coaxially fixed inside the purification cylinder cavity. The circulation cylinder has a vertically penetrating intermediate cylinder cavity, the top and bottom of which are connected to the purification cylinder cavity. A settling mechanism is provided in the intermediate cylinder cavity. An annular cavity is formed between the circulation cylinder and the purification cylinder, and a settling cavity is formed below the circulation cylinder. A fluid circulation mechanism is provided inside the purification cylinder cavity. The fluid circulation mechanism is used to allow the oil in the annular cavity to flow in from the top of the intermediate cylinder cavity, and to form oil stratification at the bottom of the circulation cylinder. Then, the upper layer of oil that has not settled sufficiently flows in from the bottom of the intermediate cylinder cavity into the annular cavity. The fluid circulation mechanism includes: The internal circulation structure has two internal circulation ports, which are vertically spaced at the upper and lower ends of the circulation cylinder. The internal circulation structure is used to allow waste oil in the annular cavity to flow in from the upper internal circulation port and then flow out from the lower internal circulation port. The external circulation structure is provided in multiple ways. Each external circulation structure is arranged vertically at intervals in the annular cavity and located between two internal circulation ports. Each external circulation structure is fixedly connected to the outer wall of the circulation cylinder. Each external circulation structure is used to transport waste oil in the annular cavity from bottom to top. The inner loop structure includes: Two flow guide rings are provided, each flow guide ring is correspondingly disposed on the corresponding end of the circulation cylinder, the axis of each flow guide ring is collinear with the axis of the circulation cylinder, each flow guide ring has multiple flow guide inlets and multiple flow guide outlets, the corresponding flow guide inlets and corresponding flow guide outlets together form a flow guide channel, each flow guide channel is arranged circumferentially at intervals along the axis of the circulation cylinder, and each flow guide channel is inclined; Two guide impellers are provided, each of which is rotatably mounted on a corresponding guide ring, and the axis of rotation is collinear with the axis of the guide ring; The drive shaft is arranged vertically and is poweredly connected to the two guide impellers; A driver for driving the drive shaft to rotate; The end faces of the two guide rings located at their guide outlets are arranged opposite each other; Wherein, the radius of the annulus formed by each of the flow guide outlets is smaller than the radius of the annulus formed by each of the flow guide inlets; Each of the aforementioned external circulation structures includes: A fixing ring is sleeved on the circulating cylinder and spaced apart from the circulating cylinder. The axis of the fixing ring is collinear with the axis of the circulating cylinder. The fixing ring is provided with a plurality of external circulation ports that pass through in the vertical direction. Each of the external circulation ports is arranged circumferentially at intervals along the axis of the fixing ring. Multiple connecting rods are provided, and each connecting rod is arranged circumferentially at intervals along the axis of the fixed ring. One end of each connecting rod is connected to the outer wall of the circulating cylinder, and the other end of each connecting rod extends horizontally outward and connects to the inner wall of the fixed ring. Multiple miniature water pumps are provided, each miniature water pump is configured to correspond one-to-one with each of the external circulation ports, and each miniature water pump is used to transport waste oil in the annular cavity from bottom to top.

2. The solvent refining method with waste lubricating oil regeneration device according to claim 1, characterized by, Each of the external circulation ports of the fixed ring is equipped with a filter screen.

3. The solvent refining method with waste lubricating oil regeneration device according to claim 1, characterized by, The settling mechanism includes multiple settling plates, each of which is disposed in the intermediate cylinder cavity and fixedly connected to the circulating cylinder body. Each settling plate is spirally wound around the intermediate cylinder cavity along the axis of the circulating cylinder body, and each settling plate is inclined.

4. The solvent refining method with waste lubricating oil regeneration device according to claim 1, characterized by, The internal circulation structure also includes an oil shield, which is mounted on the drive unit.

5. The apparatus for regenerating waste lubricating oil by solvent purification method according to claim 1, wherein The outer wall of the circulation cylinder is uniformly provided with multiple connecting cantilever arms, each of which connects to the purification barrel and the circulation cylinder respectively.

6. The apparatus for regenerating waste lubricating oil for solvent refining process according to claim 1, wherein The purification tank includes: The barrel body has the purification chamber with an open top, and the discharge port is provided at the bottom of the barrel body; A cover is provided over the opening of the barrel body, and the cover is provided with the feed inlet; The support legs are provided in multiples, and each support leg is arranged circumferentially on the barrel body along the axis of the purification cylinder.

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