Waste lubricating oil regeneration device for solvent purification method

Abstract

The invention provides a waste lubricating oil regeneration device for a solvent purification method, which comprises a purification barrel body with a purification barrel cavity; the circulating barrel is provided with a middle barrel cavity which is through up and down, and the top end and the bottom end of the middle barrel cavity are both communicated with the purification barrel cavity; a settling mechanism is arranged in the middle cylinder cavity; an annular cavity is formed between the circulating barrel body and the purification barrel body; and the fluid circulating mechanism is used for enabling the oil in the annular cavity to flow into the annular cavity from the top end of the middle cylinder cavity, enabling the oil to be layered at the bottom end of the circulating cylinder body, and enabling the oil which is not fully settled on the upper layer to flow into the annular cavity from the bottom end of the middle cylinder cavity. According to the waste lubricating oil regeneration device for the solvent purification method, provided by the invention, oil liquid is promoted to continuously circulate in the waste lubricating oil regeneration device through the fluid circulation mechanism, so that the oil liquid which is not fully settled can enter a treatment process again, and the generation of an intermediate layer is reduced. The settling cavity formed at the bottom end of the circulating barrel provides favorable conditions for layering of oil liquid, mixing of all phases is avoided, and therefore loss of base oil is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of waste lubricating oil regeneration, and in particular relates to a waste lubricating oil regeneration device for a solvent purification method. Background Art

[0002] Solvent purification is a commonly used physical and chemical method in the regeneration of waste lubricating oil. Its core principle is to utilize the difference in solubility of solvents on different components in lubricating oil (base oil, additives, impurities, etc.). Through dissolution, separation, purification and other steps, it removes colloids, asphaltene, mechanical impurities, moisture and some additives in the waste lubricating oil, thereby restoring the performance of the lubricating oil.

[0003] In the existing technology, during the sedimentation separation stage of the solvent purification method, waste lubricating oil contains surfactants such as colloids, asphaltene, soaps, etc., which are easy to form stable emulsions after mixing with solvents, making it difficult to clearly separate the oil phase, solvent phase, and impurity phase. In addition, an "intermediate layer" (a transition layer containing a large amount of emulsion) is likely to appear, which not only affects the separation effect but also causes base oil loss, resulting in poor adaptability and poor practicality. Summary of the Invention

[0004] The embodiment of the present invention provides a waste lubricating oil regeneration device for a solvent purification method, aiming to solve the problem of poor separation effect and large base oil loss in the sedimentation separation stage of the existing solvent purification method.

[0005] To achieve the above object, the technical solution adopted by the present invention is to provide a waste lubricating oil regeneration device for a solvent purification method, comprising: The purification barrel body has a purification barrel cavity, and the purification barrel body is provided with a feed inlet and a discharge port; A circulation cylinder is coaxially fixed in the purification cylinder cavity. The circulation cylinder has an intermediate cylinder cavity that passes through from top to bottom. The top and bottom ends of the intermediate cylinder cavity are both connected to the purification cylinder cavity. A sedimentation mechanism is provided in the intermediate cylinder cavity. An annular cavity is formed between the circulation cylinder and the purification barrel, and a sedimentation cavity is formed below the circulation cylinder. A fluid circulation mechanism is arranged in the purification cylinder cavity. The fluid circulation mechanism is used to allow the oil in the annular cavity to flow into the top of the intermediate cylinder cavity, and to form an oil layer at the bottom end of the circulation cylinder, and then allow the upper layer of oil that has not fully settled to flow into the annular cavity from the bottom end of the intermediate cylinder cavity.

[0006] In a possible implementation, the fluid circulation mechanism includes: An internal circulation structure having two internal circulation ports, which are vertically spaced apart at the upper and lower ends of the circulation cylinder, and the internal circulation structure is used to allow the waste oil in the annular cavity to flow into the upper internal circulation port and then flow out from the lower internal circulation port; There are multiple external circulation structures, each of which is arranged in the annular cavity at intervals along the vertical direction and is located between the two internal circulation ports. Each of the external circulation structures is fixedly connected to the outer wall of the circulation cylinder, and each of the external circulation structures is used to transport the waste oil in the annular cavity from bottom to top.

[0007] In a possible implementation, the inner loop structure includes: There are two guide rings, each of which is correspondingly arranged on the corresponding end of the circulation cylinder, the axis of each guide ring is collinear with the axis of the circulation cylinder, each guide ring has multiple guide inlets and multiple guide outlets, the corresponding guide inlets and the corresponding guide outlets together constitute a guide channel, each guide channel is annularly spaced along the axis of the circulation cylinder, and each guide channel is inclined; There are two guide impellers, each of which is rotatably mounted on the corresponding guide ring, with its rotation axis collinear with the axis of the guide ring; A drive shaft is arranged in a vertical direction and is dynamically connected to the two guide impellers; A driver, configured to drive the drive shaft to rotate; The end surfaces of the two guide rings where the guide outlets are located are arranged opposite to each other; Wherein, the radius of the ring formed by each of the diversion outlets is smaller than the radius of the ring formed by each of the diversion inlets.

[0008] In a possible implementation, each of the outer loop structures includes: A fixed ring is sleeved on the circulation cylinder and spaced apart from the circulation cylinder. The axis of the fixed ring is collinear with the axis of the circulation cylinder. The fixed ring is provided with a plurality of external circulation ports extending vertically therethrough. The external circulation ports are spaced apart along the axis of the fixed ring. There are multiple connecting rods, each of which is arranged at an annular interval along the axis of the fixed ring, one end of each connecting rod is connected to the outer wall of the circulation cylinder, and the other end of each connecting rod extends horizontally outward to connect to the inner wall of the fixed ring; There are multiple micro water pumps, each of which is arranged in a one-to-one correspondence with each of the external circulation ports. Each of the micro water pumps is used to transport the waste oil in the annular cavity from bottom to top.

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

[0010] In one possible implementation, the sedimentation mechanism includes multiple sedimentation plates, each of which is arranged in the intermediate cylinder cavity and fixedly connected to the circulation cylinder. Each sedimentation plate is spirally arranged in the intermediate cylinder cavity along the axis of the circulation cylinder, and each sedimentation plate is arranged at an angle.

[0011] In a possible implementation, the internal circulation structure further includes an oil-proof cover, and the oil-proof cover is provided on the driver.

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

[0013] In a possible implementation, the purification barrel includes: The barrel body has the purification cylinder cavity with an open top and the discharge port at the bottom of the barrel body; A cover body is provided on the open opening of the barrel body, and the feed port is provided on the cover body; There are multiple support legs, and each support leg is arranged on the barrel body at an annular interval along the axis of the purification cylinder cavity.

[0014] Compared to existing technologies, this implementation utilizes a fluid circulation mechanism to continuously circulate the oil, allowing any unsettled oil to re-enter the treatment process, reducing the formation of intermediate layers. The settling chamber formed at the bottom of the circulation cylinder facilitates the separation of the oil, solvent, and impurity phases, preventing intermixing and thus reducing base oil loss. The oil's circulation enhances contact between the various components and the solvent, facilitating the dissolution and separation of impurities and improving the efficiency and quality of the regeneration process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Schematic diagram of the internal structure of the waste lubricating oil regeneration device for solvent purification provided by the embodiment of the present invention Figure 1 ; Figure 2 Schematic diagram of the internal structure of the waste lubricating oil regeneration device for solvent purification provided by the embodiment of the present invention Figure 2 ; Figure 3 for Figure 2 Schematic diagram of the enlarged structure at A in the middle; Description of reference numerals: 10. Purification barrel; 11. Barrel body; 12. Cover; 13. Support legs; 20. Circulation cylinder; 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. Fixed ring; 322. Connecting rod; 323. Micro water pump; 40. Sedimentation mechanism; 41. Sedimentation plate. DETAILED DESCRIPTION

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] It should be noted that the terms "length", "width", "height", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "head", "tail", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0018] It should also be noted that, unless otherwise expressly specified or limited, terms such as "installed," "connected," "fixed," and "disposed" should be understood broadly. For example, they may refer to fixed connections, removable connections, or integration. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary, and they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on 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 being referenced. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Furthermore, "plurality" and "several" mean two or more, unless otherwise specifically defined.

[0020] Please also refer to Figures 1 to 3, the waste lubricating oil regeneration device for solvent purification provided by the present invention is now described. The waste lubricating oil regeneration device for solvent purification comprises a purification barrel 10, a circulation barrel 20 and a fluid circulation mechanism 30. The purification barrel 10 has a purification barrel cavity, and the purification barrel 10 is provided with a feed port and a discharge port. The circulation barrel 20 is coaxially fixed in the purification barrel cavity, and the circulation barrel 20 has an intermediate barrel cavity that passes through from top to bottom, and the top and bottom ends of the intermediate barrel cavity are both connected to the purification barrel cavity. A sedimentation mechanism 40 is provided in the intermediate barrel cavity. An annular cavity is formed between the circulation barrel 20 and the purification barrel 10, and a sedimentation cavity is formed below the circulation barrel 20. The fluid circulation mechanism 30 is arranged in the purification barrel cavity, and the fluid circulation mechanism 30 is used to allow the oil in the annular cavity to flow into from the top of the intermediate barrel cavity, and to form an oil stratification at the bottom end of the circulation barrel 20, and then to allow the upper layer of oil that has not been fully settled to flow into the annular cavity from the bottom end of the intermediate barrel cavity.

[0021] Compared to existing technologies, the waste lubricating oil regeneration device for solvent purification provided in this embodiment utilizes a fluid circulation mechanism 30 to continuously circulate the oil, allowing any oil that has not fully settled to re-enter the treatment process, thereby reducing the formation of intermediate layers. The settling chamber formed at the bottom of the circulation cylinder 20 facilitates the separation of the oil, solvent, and impurity phases, preventing intermixing between the phases and thus reducing base oil loss. The oil's circulation enhances contact between the various components and the solvent, facilitating the dissolution and separation of impurities and improving the efficiency and quality of the regeneration process.

[0022] The circulation cylinder 20 can be tapered with a smaller diameter at the bottom, 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 a pipeline to achieve oil circulation.

[0023] In some embodiments, the fluid circulation mechanism 30 may be configured as follows: Figures 1 to 3 The structure shown. Figures 1 to 3 The fluid circulation mechanism 30 includes an internal circulation structure 31 and an external circulation structure 32. The internal circulation structure 31 has two internal circulation ports, which are spaced apart in the vertical direction at the upper and lower ends of the circulation cylinder 20. The internal circulation structure 31 is used to allow the waste oil in the annular cavity to flow into the upper internal circulation port and then flow out from the lower internal circulation port. There are multiple external circulation structures 32, each of which is spaced apart in the vertical direction in the annular cavity and is located between the two internal circulation ports. Each external circulation structure 32 is fixedly connected to the outer wall of the circulation cylinder 20, and each external circulation structure 32 is used to transport the waste oil in the annular cavity from bottom to top.

[0024] This breaks up the stable emulsion structure and promotes the separation of the phases. Multiple external circulation structures 32 are spaced vertically apart, allowing oil at different heights to be circulated and treated, ensuring uniform treatment. This dual circulation structure improves oil circulation efficiency and treatment effectiveness, reduces the formation of "intermediate layers," further reduces base oil loss, and enhances the practicality of the device.

[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 oil circulation volume. The outer circulation structure 32 can use a screw conveyor instead of the micro water pump 323, and the rotation of the spiral blades can realize the oil transportation from bottom to top.

[0026] In some embodiments, the internal circulation structure 31 may be configured as follows: Figures 1 to 3 The structure shown. 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. There are two guide rings 311, each of which is arranged on the corresponding end of the circulation cylinder 20. The axis of each guide ring 311 is arranged collinearly with the axis of the circulation cylinder 20. Each guide ring 311 has multiple guide inlets and multiple guide outlets. The corresponding guide inlets and the corresponding guide outlets together constitute a guide channel. Each guide channel is arranged at an annular interval along the axis of the circulation cylinder 20, and each guide channel is arranged at an angle. There are two guide impellers 312, each of which is rotatably arranged on the corresponding guide ring 311, and the rotation axis is arranged collinearly with the axis of the guide ring 311. The drive shaft 313 is arranged in the vertical direction and is dynamically connected to the two guide impellers 312. The driver 314 is used to drive the drive shaft 313 to rotate.

[0027] The end surfaces of the two guide rings 311 where the guide outlets are located are arranged opposite to each other.

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

[0029] The guide channel of the guide ring 311 is set at an angle, which can guide the oil to flow in a specific direction, reduce energy loss during the flow of the oil, and improve circulation efficiency. The guide impeller 312 rotates under the drive of the driver 314, providing power for the flow of the oil and enhancing the circulation intensity of the oil. The guide outlet end faces of the two guide rings 311 are arranged relative to each other, so that the oil circulating up and down forms convection in the middle area, which increases the interaction between the oil and helps to break the emulsion. The annular radius formed by the guide outlet is smaller than the guide inlet, so that the oil forms a certain flow velocity change during the flow process, generates turbulence, and further promotes the separation of the phases. The setting of the drive shaft 313 and the driver 314 realizes the synchronous rotation of the two guide impellers 312, ensures the stability and consistency of the internal circulation, and improves the treatment effect of the device.

[0030] The inclination angle of the guide channel can be adjusted according to the viscosity of the oil, with the angle increasing 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, thereby enhancing the circulation power of the oil.

[0031] In some embodiments, the outer circulation structure 32 may be configured as follows: Figures 1 to 3 The structure shown. 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 is spaced apart from the circulation cylinder 20. The axis of the fixed ring 321 is collinear with the axis of the circulation cylinder 20. The fixed ring 321 is provided with a plurality of external circulation ports that pass through in the vertical direction, and each external circulation port is arranged at an annular interval along the axis of the fixed ring 321. There are a plurality of connecting rods 322, each connecting rod 322 is arranged at an annular interval 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 of each connecting rod 322 extends horizontally outward to connect to the inner wall of the fixed ring 321. There are a plurality of micro water pumps 323, each micro water pump 323 is arranged in a one-to-one correspondence with each external circulation port, and each micro water pump 323 is used to transport the waste oil in the annular cavity from bottom to top.

[0032] The fixing ring 321 provides a stable installation base for the micro water pump 323, and the connecting rod 322 connects the fixing ring 321 to the circulation cylinder 20, ensuring the stability of the outer circulation structure 32 in the annular cavity. Multiple micro water pumps 323 are arranged at annular intervals along the fixing ring 321, which can evenly extract oil from different positions in the annular cavity, so that the oil forms a uniform upward flow in the annular cavity, avoiding the retention of local oil. The outer circulation structure 32 is located between the two inner circulation ports, transporting the oil below the annular cavity to the top, and cooperating with the inner circulation structure 31 to form a complete circulation path, so that the oil that has not been fully settled can enter the inner circulation structure 31 in time for re-processing. This structural design enhances the overall circulation effect of the oil, helps to break 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 fixing ring 321 may be formed as follows: Figure 3 The structure shown. Figure 3 , each external circulation port of the fixed ring 321 is provided with a filter.

[0034] The installation of a filter at the external circulation port of fixed ring 321 effectively filters larger impurities from the oil, preventing these impurities from entering micro-water pump 323 and preventing damage to micro-water pump 323 due to clogging. This extends the service life of micro-water pump 323 and reduces the maintenance cost of the device. Furthermore, the filter reduces the circulation of impurities within the annular cavity, preventing them from promoting the emulsification process of the oil, helping to maintain the stability of the oil and promoting the stratification of the various phases. The installation of the filter does not affect the normal flow of the oil, ensuring the delivery efficiency of the external circulation structure 32, enabling the device to operate stably and over the long term, and enhancing the reliability and practicality of the device.

[0035] The filter screen can be replaced with a filter element, which has higher filtration accuracy and is suitable for situations where strict requirements on impurity content are required. A separate filter can also be set at the water inlet of the micro water pump 323 to replace the filter screen on the external circulation port.

[0036] In some embodiments, the sinking mechanism 40 may be configured as follows: Figures 1 to 3 The structure shown. Figures 1 to 3 The sedimentation mechanism 40 includes multiple sedimentation plates 41, each of which is arranged in the middle cylinder cavity and fixedly connected to the circulation cylinder 20. Each sedimentation plate 41 is spirally wrapped around the axis of the circulation cylinder 20 in the middle cylinder cavity, and each sedimentation plate 41 is arranged at an angle.

[0037] The spiral structure causes the oil to flow in a spiral shape in the middle cylinder cavity, increasing the disturbance of the oil, facilitating the collision and coagulation of impurities, and promoting the sedimentation of impurities. The inclined setting of the sedimentation plate 41 allows the settled impurities to slide along the sedimentation plate 41 to the bottom end of the circulation cylinder 20 under the action of gravity, facilitating the collection and discharge of impurities. The setting of the sedimentation mechanism 40 improves the sedimentation efficiency of the oil, reduces the content of impurities in the oil, avoids the influence of impurities on the separation of the oil phase and the solvent phase, reduces the possibility of the formation of an "intermediate layer", thereby improving the purity and recovery rate of the base oil and enhancing the treatment effect of the device.

[0038] The settling plate 41 may be of a corrugated structure to increase the contact area between the oil and the settling plate 41 and promote the adsorption and sedimentation of impurities. The settling plate 41 may be made of an oleophilic material to improve the adsorption capacity of impurities in the oil phase.

[0039] In some embodiments, the internal circulation structure 31 may be configured as follows: Figures 1 to 3 The structure shown. Figures 1 to 3 The internal circulation structure 31 also includes an oil-proof cover 315 , which is provided on the driver 314 .

[0040] An oil shield 315 is provided on the driver 314 of the internal circulation structure 31 to effectively prevent oil from splashing onto the driver 314, thereby preventing oil from corroding or short-circuiting the electrical components of the driver 314. This ensures the normal operation of the driver 314 and extends 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 is relatively low in cost. It significantly improves the safety and reliability of the device, enabling stable operation in environments where oil splashing is possible, thereby enhancing the device's practicality.

[0041] The oil-proof cover 315 can be made of a transparent material to facilitate observation of the operating state of the driver 314. The oil-proof cover 315 can also be made of a heat-dissipating function to enhance the heat dissipation effect of the driver 314 while preventing oil from splashing.

[0042] In some embodiments, the circulation cylinder 20 may be formed as follows: Figures 1 to 3 The structure shown. Figures 1 to 3 A plurality of connecting cantilevers 21 are evenly provided on the outer wall of the circulation cylinder 20, and each connecting cantilever 21 is respectively connected to the purification barrel 10 and the circulation cylinder 20.

[0043] A plurality of connecting cantilevers 21 are provided on the outer wall of the circulation cylinder 20, which respectively connect the purification cylinder 10 and the circulation cylinder 20, and can stably fix the circulation cylinder 20 in the purification cylinder cavity of the purification cylinder 10, thereby ensuring the stability of the circulation cylinder 20 during the operation of the device, avoiding the circulation cylinder 20 from shaking or displacement due to the flow of oil, ensuring the stability of the oil circulation path, and promoting the normal separation of oil. The connecting cantilevers 21 are evenly distributed along the outer wall of the circulation cylinder 20, so that the force acting on the circulation cylinder 20 is uniform, reducing the concentration of local stress, and extending the service life of the circulation cylinder 20. The provision of the connecting cantilever 21 does not affect the flow of oil in the annular cavity and the intermediate cylinder cavity, thereby ensuring the processing efficiency of the device and enhancing the structural stability and reliability of the device. The connecting cantilever 21 can be replaced by a support rod, and a triangular support structure is adopted to enhance the stability of the circulation cylinder 20.

[0044] In some embodiments, the purification barrel 10 can be made of Figure 1 、 Figure 2 The structure shown. Figure 1 、 Figure 2 The purification barrel 10 comprises a barrel body 11, a cover 12, and support legs 13. The barrel body 11 has a purification chamber with an open top and a discharge port at its bottom. The cover 12 covers the open top of the barrel body 11 and has a feed port. Multiple support legs 13 are provided, each of which is annularly spaced on the barrel body 11 along the axis of the purification chamber.

[0045] The purification cylinder cavity of the barrel body 11 provides sufficient volume for the treatment of oil, and the discharge port at the bottom facilitates the discharge of the treated oil phase, solvent phase and impurity phase. The cover body 12 is provided on the open part of the barrel body 11, so that the purification cylinder cavity forms a closed space, preventing the volatilization of oil and solvent, reducing pollution to the environment, and also preventing external impurities from entering the purification cylinder cavity, ensuring the purity of the treatment process. The support legs 13 enable the device to be placed stably on the ground, avoiding shaking of the device during operation and enhancing the stability of the device. This structural design is simple and reasonable, convenient for the manufacture, installation and maintenance of the device, and improves the practicality and safety of the device.

[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 only 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 in the scope of protection of the present invention.

Claims

1. A waste lubricating oil regeneration device for solvent purification, characterized in that: include: The purification barrel body has a purification barrel cavity, and the purification barrel body is provided with a feed inlet and a discharge port; A circulation cylinder is coaxially fixed in the purification cylinder cavity. The circulation cylinder has an intermediate cylinder cavity that passes through from top to bottom. The top and bottom ends of the intermediate cylinder cavity are both connected to the purification cylinder cavity. A sedimentation mechanism is provided in the intermediate cylinder cavity. An annular cavity is formed between the circulation cylinder and the purification barrel, and a sedimentation cavity is formed below the circulation cylinder. A fluid circulation mechanism is arranged in the purification cylinder cavity. The fluid circulation mechanism is used to allow the oil in the annular cavity to flow into the top of the intermediate cylinder cavity, and to form an oil layer at the bottom end of the circulation cylinder, and then allow the upper layer of oil that has not fully settled to flow into the annular cavity from the bottom end of the intermediate cylinder cavity.

2. The waste lubricating oil regeneration device for solvent purification according to claim 1, characterized in that: The fluid circulation mechanism comprises: An internal circulation structure having two internal circulation ports, which are vertically spaced apart at the upper and lower ends of the circulation cylinder, and the internal circulation structure is used to allow the waste oil in the annular cavity to flow into the upper internal circulation port and then flow out from the lower internal circulation port; There are multiple external circulation structures, each of which is arranged in the annular cavity at intervals along the vertical direction and is located between the two internal circulation ports. Each of the external circulation structures is fixedly connected to the outer wall of the circulation cylinder, and each of the external circulation structures is used to transport the waste oil in the annular cavity from bottom to top.

3. The waste lubricating oil regeneration device for solvent purification according to claim 2, characterized in that: The inner loop structure includes: There are two guide rings, each of which is correspondingly arranged on the corresponding end of the circulation cylinder, the axis of each guide ring is collinear with the axis of the circulation cylinder, each guide ring has multiple guide inlets and multiple guide outlets, the corresponding guide inlets and the corresponding guide outlets together constitute a guide channel, each guide channel is annularly spaced along the axis of the circulation cylinder, and each guide channel is inclined; There are two guide impellers, each of which is rotatably mounted on the corresponding guide ring, with its rotation axis collinear with the axis of the guide ring; A drive shaft is arranged in a vertical direction and is dynamically connected to the two guide impellers; A driver, configured to drive the drive shaft to rotate; The end surfaces of the two guide rings where the guide outlets are located are arranged opposite to each other; Wherein, the radius of the ring formed by each of the diversion outlets is smaller than the radius of the ring formed by each of the diversion inlets.

4. The waste lubricating oil regeneration device for solvent purification according to claim 2, wherein: Each of the external circulation structures includes: A fixed ring is sleeved on the circulation cylinder and spaced apart from the circulation cylinder. The axis of the fixed ring is collinear with the axis of the circulation cylinder. The fixed ring is provided with a plurality of external circulation ports extending vertically therethrough. The external circulation ports are spaced apart along the axis of the fixed ring. There are multiple connecting rods, each of which is arranged at an annular interval along the axis of the fixed ring, one end of each connecting rod is connected to the outer wall of the circulation cylinder, and the other end of each connecting rod extends horizontally outward to connect to the inner wall of the fixed ring; There are multiple micro water pumps, each of which is arranged in a one-to-one correspondence with each of the external circulation ports. Each of the micro water pumps is used to transport the waste oil in the annular cavity from bottom to top.

5. The waste lubricating oil regeneration device for solvent purification according to claim 4, characterized in that: A filter screen is provided on each of the external circulation ports of the fixed ring.

6. The waste lubricating oil regeneration device for solvent purification according to claim 1, wherein: The sedimentation mechanism includes a plurality of sedimentation plates, each of which is arranged in the intermediate cylinder cavity and fixedly connected to the circulation cylinder. Each of the sedimentation plates is spirally wrapped around the axis of the circulation cylinder in the intermediate cylinder cavity, and each of the sedimentation plates is arranged at an angle.

7. The waste lubricating oil regeneration device for solvent purification according to claim 3, characterized in that: The internal circulation structure further includes an oil-proof cover, which is arranged on the driver.

8. The waste lubricating oil regeneration device for solvent purification according to claim 1, wherein: A plurality of connecting cantilevers are evenly arranged on the outer wall of the circulation cylinder, and each connecting cantilever is respectively connected to the purification barrel and the circulation cylinder.

9. The waste lubricating oil regeneration device for solvent purification according to claim 1, wherein: The purification barrel comprises: The barrel body has the purification cylinder cavity with an open top and the discharge port at the bottom of the barrel body; A cover body is provided on the open opening of the barrel body, and the feed port is provided on the cover body; There are multiple support legs, and each support leg is arranged on the barrel body at an annular interval along the axis of the purification cylinder cavity.

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