A multi-stage swirling floating oil recovery device

Abstract

This invention provides a multi-stage swirling floating oil collection device, mainly comprising a wastewater tank, a swirling mechanism, multiple limiting mechanisms, a buoyancy mechanism, and an oil collection mechanism. The wastewater tank is used to contain wastewater; the swirling mechanism is used to spray the wastewater in a swirling state to separate oil and water in the wastewater; the multiple limiting mechanisms are used to restrict the buoyancy mechanism and the oil collection mechanism to move only along the axis of the wastewater tank; the buoyancy mechanism is used to maintain a preset height between the upper end face of the oil collection mechanism and the wastewater surface; the oil collection mechanism is installed on the buoyancy mechanism and is used to collect the oil separated from the wastewater; the swirling mechanism can uniformly spray the wastewater in a swirling state, improving the efficiency of oil droplet collision and coalescence, making oil-water separation more thorough; the buoyancy mechanism can flexibly and dynamically adjust the buoyancy, allowing the oil collection mechanism to adapt to wastewater of different depths. This solves the problems of low oil droplet collision and coalescence efficiency and inflexible buoyancy adjustment in existing oil collection devices.

Description

Technical Field

[0001] This utility model relates to the field of wastewater treatment technology, and more specifically, to a multi-stage vortex floating oil collection device. Background Technology

[0002] In the petrochemical and oil refining industries, a significant amount of oily wastewater is generated during production. The treatment of this wastewater is a crucial aspect of environmental protection and production safety. Existing oily wastewater treatment equipment mainly includes cable-type oil recovery machines and floating disc oil skimmers. Cable-type oil recovery machines use a ring-shaped oil collection belt floating on the liquid surface, continuously collecting oil through mechanical transmission. Floating disc oil skimmers rely on buoyancy to float on the water surface, collecting oil by adhering to and scraping off floating oil using a rotating disc.

[0003] Existing braided and rotary oil recovery devices rely on a single oil recovery path, resulting in low efficiency in oil droplet collision and coalescence. This leads to some floating oil remaining in the wastewater, and the oil content remains high even after separation. Furthermore, the buoyancy adjustment of existing oil recovery devices is inflexible. Some devices adjust the height of the oil recovery port by adding or removing solid counterweights, while others even employ a fixed counterweight design. Utility Model Content

[0004] The main purpose of this invention is to provide a multi-stage swirling floating oil collection device to at least solve the problems of low oil droplet collision and coalescence efficiency and inflexible buoyancy adjustment in existing oil collection devices.

[0005] To achieve the above objectives, this utility model provides a multi-stage swirling floating oil collection device, comprising: a sewage tank installed on the ground for containing sewage; a swirling mechanism disposed on the inner wall of the sewage tank for spraying sewage in a swirling state to separate oil and water in the sewage; multiple limiting mechanisms evenly spaced along the radial direction of the sewage tank on the inner wall of the sewage tank; a buoyancy mechanism movably disposed in the inner cavity of the sewage tank along the axial direction of the sewage tank and connected to the multiple limiting mechanisms; and an oil collection mechanism mounted on the buoyancy mechanism, the buoyancy mechanism floating in the sewage to maintain a preset height between the upper end face of the oil collection mechanism and the sewage surface, the oil collection mechanism for collecting the oil separated from the sewage; wherein, the multiple limiting mechanisms restrict the buoyancy mechanism and the oil collection mechanism to move only along the axial direction of the sewage tank.

[0006] Furthermore, the sewage tank is provided with sewage holes, and the swirling mechanism includes: an inlet pipe, the first end of which passes through the sewage hole; an annular water distribution pipe, the inlet of which is connected to the second end of the inlet pipe, the annular water distribution pipe being fixed to the bottom of the sewage tank, and the annular water distribution pipe having multiple outlets evenly spaced along the circumference to divert sewage; and multiple swirling tubes, which are fixed vertically on the inner wall of the sewage tank, with the inlets of the multiple swirling tubes connected one-to-one with the multiple outlets on the annular water distribution pipe, and the multiple swirling tubes being used to spray sewage out in a swirling state.

[0007] Furthermore, the vortex mechanism also includes multiple flexible connectors. The inlets of the multiple vortex tubes are connected one-to-one with the multiple outlets opened on the annular water distribution pipe through the multiple flexible connectors. The flexible connectors are used to compensate for the positional deviations generated during the installation of the vortex tubes through elastic deformation.

[0008] Furthermore, the vortex tube includes: a main pipe, the inlet of which is connected one-to-one with multiple outlets on the annular water distribution pipe, the main pipe having multiple outlets in the vertical direction for secondary diversion of sewage; multiple vortex tube supports, the multiple vortex tube supports being evenly spaced in the vertical direction on the main pipe and connected to the sewage tank, the multiple vortex tube supports being used to fix the main pipe to the inner wall of the sewage tank; and multiple nozzles, the inlets of the multiple nozzles being connected one-to-one with multiple outlets of the main pipe, and the axial direction of the multiple nozzles being set at a 45-degree angle to the radial direction of the sewage tank, the multiple nozzles being used to spray sewage out at a 45-degree angle.

[0009] Furthermore, the limiting mechanism includes: a guide rail, which is vertically mounted on the inner wall of the sewage tank; a limiting support arm, which is horizontally mounted on the guide rail along the radial direction of the sewage tank, and slides vertically on the guide rail to restrict the buoyancy mechanism to move only along the axial direction of the sewage tank; and a limiting rod, which is mounted on the guide rail and is used to limit the highest position that the limiting support arm can move along the guide rail.

[0010] Furthermore, the limiting support arm includes a straight rod and a V-shaped limiting groove. The V-shaped limiting groove is fixed to the first end of the straight rod and is installed correspondingly to the guide rail to limit the movement of the limiting support arm to the vertical direction only.

[0011] Furthermore, the feature is that the sewage tank is also provided with a water distribution hole, and the buoyancy mechanism includes: multiple floats, which are evenly spaced along the radial direction of the sewage tank and connected to the second ends of multiple limiting support arms respectively, and the multiple floats float in the sewage to provide buoyancy to the buoyancy mechanism; a counterweight box, which is movably disposed in the sewage tank along the axial direction of the sewage tank and connected to the multiple floats, and is used to adjust the buoyancy of the buoyancy mechanism, and the counterweight box is provided with a counterweight inlet; and a counterweight regulating pipe, the first end of which passes through the water distribution hole, and the second end of which is connected to the counterweight inlet, and is used to supply water to the counterweight box.

[0012] Furthermore, the buoyancy mechanism further includes a support frame installed at the bottom of the counterweight box, which provides support when the counterweight box is displaced to the bottom of the sewage tank.

[0013] Furthermore, the feature is that a mounting position is provided at the center of the counterweight box, and the mounting position is used to install the oil collection mechanism.

[0014] Furthermore, the feature is that the sewage tank is also provided with an oil outlet, and the oil collection mechanism includes: an oil collection trough, which is installed at the mounting position and is used to collect the oil on the upper layer of sewage, with an oil outlet at the bottom of the oil collection trough; and an oil collection pipe, the first end of which is inserted into the oil outlet, and the second end of which is connected to the oil outlet, and is used to guide the collected oil to the outside of the sewage tank.

[0015] This utility model discloses a multi-stage swirling floating oil collection device, comprising: a wastewater tank, a swirling mechanism, multiple limiting mechanisms, a buoyancy mechanism, and an oil collection mechanism. The wastewater tank contains wastewater. The swirling mechanism, located on the inner wall of the wastewater tank, consists of multiple swirling tubes and multiple nozzles thereon, used to spray the wastewater in a swirling state to separate oil and water in the wastewater. Multiple limiting mechanisms are evenly spaced along the radial direction of the wastewater tank's inner wall, restricting the buoyancy mechanism and oil collection mechanism to move only along the axial direction of the wastewater tank. The buoyancy mechanism moves along the axial direction of the wastewater tank... The oil-collecting mechanism is movably mounted in the inner cavity of the wastewater tank and connected to multiple limiting mechanisms. A buoyancy mechanism floats in the wastewater to maintain a preset height between the upper surface of the oil-collecting mechanism and the wastewater surface. The oil-collecting mechanism, mounted on the buoyancy mechanism, collects the oil separated from the wastewater. Multiple swirling tubes and nozzles of the swirling mechanism can evenly and effectively spray the wastewater in a swirling state, improving the oil droplet collision and coalescence efficiency and making oil-water separation more thorough. The buoyancy mechanism can flexibly adjust buoyancy, allowing the oil-collecting mechanism to adapt to wastewater of different depths during oil collection. This solves the problems of low oil droplet collision and coalescence efficiency and inflexible buoyancy adjustment in existing oil-collecting devices. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings: Figure 1 This is a schematic diagram of the structure of a multi-stage swirling floating oil collection device, which is an optional embodiment of this utility model. Figure 2 This is a top view of a multi-stage swirling floating oil collection device, which is an optional embodiment of this utility model. Figure 3 This is a schematic diagram of the structure of a cyclone tube in an optional multi-stage cyclone floating oil collection device according to an embodiment of the present utility model; Figure 4 This is a view from direction A of the cyclone tube of a multi-stage cyclone floating oil collection device, which is optional according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the limiting mechanism of a multi-stage swirling floating oil collection device, which is an optional embodiment of this utility model. Figure 6 This is a top view of a multi-stage swirling floating oil collection device, which is an optional embodiment of this utility model. Figure 7 This is a partial view of a limiting support arm for a multi-stage swirling floating oil collection device, which is optional according to an embodiment of the present utility model. Figure 8 This is a schematic diagram of the buoyancy mechanism, oil collection mechanism, and limiting support arm of a multi-stage swirling floating oil collection device, which can be selected according to an embodiment of this utility model.

[0017] The above figures include the following reference numerals: 10. Sewage tank; 11. Sewage inlet; 12. Water distribution inlet; 13. Oil outlet; 20. Swirl mechanism; 21. Water inlet pipe; 22. Annular water distribution pipe; 23. Swirl pipe; 231. Main pipe; 232. Swirl pipe support; 233. Nozzle; 24. Flexible connecting pipe; 30. Limiting mechanism; 31. Guide rail; 32. Limiting support arm; 321. Straight rod; 322. V-shaped limiting groove; 33. Limiting rod; 40. Buoyancy mechanism; 41. Float; 42. Counterweight box; 421. Mounting position; 43. Counterweight adjustment pipe; 44. Support; 50. Oil collection mechanism; 51. Oil collection trough; 52. Oil collection pipe. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] like Figure 1 , Figure 2 , Figure 5 and Figure 8 As shown in the figure, a multi-stage swirling floating oil collection device according to an embodiment of the present invention includes: a sewage tank 10, a swirling mechanism 20, multiple limiting mechanisms 30, a buoyancy mechanism 40, and an oil collection mechanism 50. A sewage tank 10 is installed on the ground and is used to contain sewage. A swirling mechanism 20 is installed on the inner wall of the sewage tank 10 and is used to spray the sewage in a swirling state to separate oil and water in the sewage. Multiple limiting mechanisms 30 are evenly spaced along the radial direction of the sewage tank 10 on the inner wall of the sewage tank 10. A buoyancy mechanism 40 is movably installed in the inner cavity of the sewage tank 10 along the axial direction and is connected to the multiple limiting mechanisms 30. An oil collection mechanism 50 is installed on the buoyancy mechanism 40 and floats in the sewage so that the upper end face of the oil collection mechanism 50 is kept at a preset height with the sewage surface. The oil collection mechanism 50 is used to collect the oil separated from the sewage. The multiple limiting mechanisms 30 are used to restrict the buoyancy mechanism 40 and the oil collection mechanism 50 to move only along the axial direction of the sewage tank 10. The swirling mechanism 20 can uniformly and effectively spray sewage in a swirling state, improving the efficiency of oil droplet collision and coalescence, and making oil-water separation more thorough. The buoyancy mechanism 40 can flexibly adjust the buoyancy, allowing the oil collection mechanism 50 to adapt to sewage at different depths during the oil collection process. This solves the problems of low oil droplet collision and coalescence efficiency and inflexible buoyancy adjustment in existing oil collection devices.

[0020] Furthermore, such as Figure 1 , Figure 2 and Figure 3As shown, the swirling mechanism 20 includes an inlet pipe 21, an annular water distribution pipe 22, and multiple swirling pipes 23. A sewage hole 11 is provided on the side wall of the sewage tank 10 near the bottom. The end of the inlet pipe 21 closest to the inner wall of the sewage tank 10 is the first end, and the end furthest from the inner wall is the second end. The first end of the inlet pipe 21 passes through the sewage hole 11. The inlet pipe 21 and the sewage tank 10 are connected by welding to ensure a tight seal and prevent liquid leakage from the sewage tank 10. The inlet pipe 21 is the entrance channel for external sewage into the sewage tank 10. The first end of the inlet pipe 21 is connected to an external sewage pump via a pipe, which pressurizes the sewage before sending it into the sewage tank 10. The inlet of the annular water distribution pipe 22 is connected to the second end of the inlet pipe 21 via a flange. The annular water distribution pipe 22 is coaxially fixed to the bottom of the sewage tank 10. The annular water distribution pipe 22 is a ring-shaped pipe with a diameter slightly smaller than the inner diameter of the sewage tank 10. The annular water distribution pipe 22 has multiple vertically upward outlets evenly spaced along the circumference to divert sewage. In the specific pipe diameter setting, the diameter of the annular water distribution pipe 22 is designed to be smaller than the diameter of the inlet pipe 21. Multiple vortex tubes 23 are vertically welded and fixed to the inner wall of the sewage tank 10. The inlets of the multiple vortex tubes 23 are connected to the multiple outlets on the annular water distribution pipe 22 one by one through flanges. The multiple vortex tubes 23 are used to spray sewage out in a vortex state. The diameter of the multiple vortex tubes 23 is designed to be smaller than the diameter of the annular water distribution pipe 22. In this embodiment, the annular water distribution pipe 22 has 8 outlets, and the corresponding vortex tubes 23 have 8 outlets.

[0021] Furthermore, such as Figure 1 As shown, the vortex mechanism 20 also includes multiple flexible connecting pipes 24. The inlets of the multiple vortex tubes 23 are connected one-to-one with the multiple outlets on the annular water distribution pipe 22 through the multiple flexible connecting pipes 24. The connection between the flexible connecting pipes 24, the annular water distribution pipe 22, and the multiple vortex tubes 23 is through flanges. The function of the flexible connecting pipes 24 is to compensate for the positional deviation of the vortex tubes 23 during installation through elastic deformation. In this embodiment, eight flexible connecting pipes 24 are provided. The flexible connecting pipes 24 are characterized by pressure resistance, corrosion resistance, vibration absorption, and easy adjustment. During the installation of the device, the installation deviation of the vortex tubes 23 can be reduced to ±0.5 meters through the compensation of the flexible connecting pipes 24, which can greatly reduce the installation difficulty and accuracy.

[0022] Furthermore, such as Figure 1 , Figure 3 and Figure 4As shown, the cyclone tube 23 includes: a main pipe 231, multiple cyclone tube supports 232, and multiple nozzles 233; the inlet of the main pipe 231 is connected one-to-one with multiple outlets on the annular water distribution pipe 22, and a flexible connecting pipe 24 can be installed between the opening of the main pipe 231 and the annular water distribution pipe 22. The main pipe 231 has multiple outlets in the vertical direction for secondary diversion of sewage. In this embodiment, the main pipe 231 has four outlets; the multiple cyclone tube supports 232 are welded evenly spaced in the vertical direction to the main pipe 231. The main pipe 231 is fixedly connected to the sewage tank 10 via pipe 231. Multiple swirl tube supports 232 are used to fix the main pipe 231 to the inner wall of the sewage tank 10. The inlets of multiple nozzles 233 are connected to the outlets of the main pipe 231 one by one via flanges. The axial direction of the multiple nozzles 233 is set at a 45-degree angle to the radial direction of the sewage tank 10. The multiple nozzles 233 are set horizontally to spray sewage at a 45-degree angle. The direction in which the nozzles 233 spray sewage is uniformly designed to spray simultaneously in a counterclockwise direction when viewed from above. In this embodiment, the number of nozzles 233 is correspondingly designed to be 4. The nozzles 233 adopt swirl atomizing nozzles to improve the collision and coalescence efficiency of oil in the sewage. The pipe diameter of the nozzles 233 is designed to be smaller than the pipe diameter of the main pipe 231. From the overall perspective, the sewage flows from the inlet pipe 21 into the annular water distribution pipe 22, then into the main pipe 231 of the swirl tube 23, and finally sprayed out through the nozzles 233. The diameter of the annular water distribution pipe 22 is smaller than that of the inlet pipe 21, the diameter of the main pipe 231 is smaller than that of the annular water distribution pipe 22, and the diameter of the nozzle 233 is smaller than that of the main pipe 231. Through the gradual reduction in diameter, the flow velocity of the sewage gradually increases, and finally it is sprayed out from the nozzle 233 at a 45-degree angle. Since the vortex pipe 23 is designed in multiple sets in the sewage tank 10, the sewage will enter the sewage tank 10 in a vortex manner. Since the nozzles 233 are evenly distributed from bottom to top on the main pipe 231, as the sewage volume increases, the liquid level rises, and the vortex layer will become more and more numerous. The rotation of the sewage in the tank will be more uniform and effective, and the oil droplets will collide and coalesce more efficiently, resulting in more thorough oil-water separation. Since the density of oil is less than that of water, and the density of water is less than that of other impurities such as sludge, the oil contained in the sewage will float to the top and rotate towards the center of the tank, while the sludge and other impurities will settle at the bottom of the tank.

[0023] Furthermore, such as Figure 5 , Figure 6 and Figure 7As shown, the limiting mechanism 30 includes: a guide rail 31, a limiting support arm 32, and a limiting rod 33. The guide rail 31 is vertically fixed on the inner wall of the sewage tank 10; the limiting support arm 32 is horizontally arranged on the guide rail 31 along the radial direction of the sewage tank 10, and slides vertically on the guide rail 31 to restrict the buoyancy mechanism 40 to move only along the axial direction of the sewage tank 10; the limiting rod 33 is installed at the top of the guide rail 31, and the limiting rod 33 is used to limit the highest position that the limiting support arm 32 can move along the guide rail 31, and further limit the highest floating position of the buoyancy mechanism 40 and the oil collection mechanism 50. In this embodiment, three limiting mechanisms 30 are used, with a horizontal angle of 120 degrees between them, to keep the buoyancy mechanism 40 and the oil collection mechanism 50 in the center of the sewage tank and restrict their horizontal movement, so that the buoyancy mechanism 40 and the oil collection mechanism 50 can only move along the axial direction of the sewage tank 10.

[0024] Furthermore, such as Figure 7 As shown, the limiting support arm 32 includes a straight rod 321 and a V-shaped limiting groove 322. The end of the straight rod 321 closest to the guide rail 31 is the first end, and the end of the straight rod 321 furthest from the guide rail 31 is the second end. The V-shaped limiting groove 322 is fixed to the first end of the straight rod 321 and is installed correspondingly to the guide rail 31 to limit the movement of the limiting support arm 32 to the vertical direction only. The V-shaped limiting groove 322 is composed of two thin plates, which are set opposite each other at a 60-degree angle and welded to the first end of the limiting support arm 32. The V-shaped limiting groove 322 can slide on the guide rail 31 in the vertical direction.

[0025] Furthermore, such as Figure 2 , Figure 6 and Figure 8 As shown, a water distribution hole 12 is also provided on the side wall of the sewage tank 10 near the bottom. The buoyancy mechanism 40 includes: multiple floats 41, a counterweight box 42 and a counterweight adjustment pipe 43. Multiple floats 41 are evenly spaced along the radial direction of the sewage tank 10 and are connected to the second ends of multiple limiting support arms 32. The floats 41 float in the sewage to provide buoyancy to the buoyancy mechanism 40. In this embodiment, the number of floats 41 is designed to be 3. The counterweight box 42 is movably disposed in the inner cavity of the sewage tank 10 along the axial direction and is connected to the multiple floats 41. The multiple floats 41 are welded and fixed around the side wall of the counterweight box 42. The counterweight box 42 is used to adjust the buoyancy of the buoyancy mechanism 40. The counterweight box 42 has a counterweight inlet. The first end of the counterweight adjusting pipe 43 passes through the water distribution hole 12, and the second end of the counterweight adjusting pipe 43 is connected to the counterweight inlet. The counterweight adjusting pipe 43 is used to supply water to the counterweight box 42. The counterweight adjusting pipe 43 is made of a specially made oil-resistant, acid-resistant and salt-resistant steel wire hose.

[0026] Overall, the counterweight box 42 adopts a cavity-sealed design with only one water inlet. The water volume inside the counterweight box 42 can be adjusted from outside the sewage tank 10 via the counterweight adjustment pipe 43, further adjusting the buoyancy of the entire buoyancy mechanism 40. In the specific implementation of buoyancy control, the counterweight adjustment pipe 43 can be connected to two different external branches via a T-fitting fitting. The first branch is connected to the clean water pipe, and a first solenoid valve is installed on the clean water pipe to control the opening and closing of the first branch. The water in the clean water pipe is pressurized by an external water pump. The second branch is connected to the drain pipe, and a second solenoid valve is installed on the drain pipe to control the opening and closing of the second branch. When the buoyancy of the buoyancy mechanism 40 is too high, the first solenoid valve is opened, and clean water enters the counterweight box 42 through the counterweight adjustment pipe 43 to reduce the buoyancy of the counterweight box 42. When the buoyancy of the buoyancy mechanism 40 is too low, the second solenoid valve is opened, and some of the clean water in the counterweight box 42 is discharged through the counterweight adjustment pipe 43 to increase the buoyancy of the counterweight box 42. In this embodiment, in the specific buoyancy design, the oil collection mechanism 50 and the limiting support arm 32 directly connected to the buoyancy mechanism 40 must also be considered. The total buoyancy of the three floats 41 is designed to be 1.1 times the required total buoyancy. The buoyancy mechanism 40 adjusts its own buoyancy to keep the upper end face of the oil collection mechanism 50 at a preset height with the sewage surface. After the oil and water in the sewage are separated, the upper layer is oil and the lower layer is water. The preset height is designed to be 5 mm above the water surface.

[0027] Furthermore, such as Figure 8 As shown, the buoyancy mechanism 40 also includes a bracket 44, which is welded and fixed to the bottom of the counterweight box 42. The bracket 44 is used to provide support when the counterweight box 42 is moved to the bottom of the sewage tank 10. When there is less sewage in the sewage tank 10, the bracket 44 can prevent the counterweight box 42 from directly contacting the bottom of the sewage tank 10. In this embodiment, the bracket 44 is designed to consist of three columns and a stainless steel plate welded to the bottom of the three columns.

[0028] Furthermore, such as Figure 8 As shown, the counterweight box 42 has a mounting position 421 at its center. The mounting position 421 is used to install the oil collection mechanism 50. In this embodiment, a through hole is designed in the center of the counterweight box 42 as the mounting position 421.

[0029] Furthermore, such as Figure 2 and Figure 8As shown, the side wall of the sewage tank 10 near the bottom is provided with an oil outlet 13. The oil collection mechanism 50 includes an oil collection trough 51 and an oil collection pipe 52. The oil collection trough 51 is fixedly installed in the mounting position 421 near the upper end. The oil collection trough 51 is used to collect the upper layer of oil in the sewage. An oil outlet is provided at the bottom of the oil collection trough 51. In this embodiment, the oil collection trough 51 is designed in the shape of a funnel. The upper end of the funnel shape is the oil collection port. The oil that has been gathered to the center of the liquid surface by the swirling mechanism 20 enters from the oil collection port on the upper end of the oil collection trough 51. The first end of the oil collection pipe 52 passes through the oil outlet 13, and the second end of the oil collection pipe 52 is connected to the oil outlet. The oil collection pipe 52 is used to guide the collected oil to the outside of the sewage tank 10. The oil collection pipe 52 is a specially made oil-resistant, acid-resistant, and salt-resistant steel wire hose.

[0030] In specific work, such as Figure 1 and Figure 5 As shown, sewage enters the annular water distribution pipe 22 from the inlet pipe 21, and then is sprayed out in a swirling state after passing through the vortex pipe 23. Oil droplets in the sprayed sewage collide and coalesce, separating the oil from the water. The oil accumulates at the center of the upper layer of the liquid surface. Multiple limiting mechanisms 30 confine the buoyancy mechanism 40 and the oil collection mechanism 50 to the center of the liquid surface in the sewage tank 10. The counterweight box 42 of the buoyancy mechanism 40 adjusts the buoyancy by controlling the amount of water inside, ensuring that the oil collection port of the oil collection mechanism 50 maintains a preset height above the liquid surface. Oil reaching the preset height enters the oil collection port and is then guided to the outside of the sewage tank 10 through the oil collection pipe 52. Figure 1 The buoyancy mechanism 40 and the oil recovery mechanism 50 are shown in two different positions.

[0031] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A multi-stage cyclonic floating oil skimming device, characterized by include: Wastewater tank (10), which is installed on the ground and is used to contain wastewater; A swirling mechanism (20) is provided on the inner wall of the sewage tank (10). The swirling mechanism (20) is used to spray sewage in a swirling state to separate oil and water in the sewage. Multiple limiting mechanisms (30) are evenly spaced along the radial direction of the sewage tank (10) on the inner wall of the sewage tank (10); A buoyancy mechanism (40) is movably disposed in the inner cavity of the sewage tank (10) along the axial direction of the sewage tank (10) and connected to a plurality of the limiting mechanisms (30); An oil collection mechanism (50) is installed on the buoyancy mechanism (40). The buoyancy mechanism (40) floats in the sewage so that the upper end face of the oil collection mechanism (50) is kept at a preset height with the sewage surface. The oil collection mechanism (50) is used to collect the oil separated from the sewage. Among them, a plurality of the limiting mechanisms (30) are used to restrict the buoyancy mechanism (40) and the oil collection mechanism (50) to move only along the axial direction of the sewage tank (10).

2. A multi-stage cyclonic floating oil collection device according to claim 1, wherein, The sewage tank (10) has a sewage hole (11), and the swirling mechanism (20) includes: Water inlet pipe (21), the first end of which passes through the sewage hole (11); The annular water distribution pipe (22) has its inlet connected to the second end of the inlet pipe (21). The annular water distribution pipe (22) is fixed to the bottom of the sewage tank (10). The annular water distribution pipe (22) has multiple outlets evenly spaced along the circumference to divert sewage. Multiple swirling tubes (23) are fixed vertically on the inner wall of the sewage tank (10). The inlets of the multiple swirling tubes (23) are connected one-to-one with the multiple outlets opened on the annular water distribution pipe (22). The multiple swirling tubes (23) are used to spray sewage in a swirling state.

3. A multi-stage cyclonic floating oil skimming device according to claim 2, wherein, The swirling mechanism (20) also includes multiple flexible connectors (24). The inlets of the multiple swirling tubes (23) are connected one-to-one with the multiple outlets opened on the annular water distribution pipe (22) through the multiple flexible connectors (24). The flexible connectors (24) are used to compensate for the positional deviation generated during the installation of the swirling tubes (23) through elastic deformation.

4. A multi-stage cyclonic floating oil skimming device according to claim 2, wherein, The cyclone tube (23) includes: The main pipe (231) has an inlet that is connected one-to-one with multiple outlets on the annular water distribution pipe (22). The main pipe (231) has multiple outlets in the vertical direction for secondary diversion of sewage. Multiple swirl tube supports (232) are evenly spaced along the vertical direction on the main pipe (231) and connected to the sewage tank (10). The multiple swirl tube supports (232) are used to fix the main pipe (231) on the inner wall of the sewage tank (10). Multiple nozzles (233) are provided, with their inlets connected one-to-one with the multiple outlets of the main pipe (231), and the axial direction of each nozzle (233) is at a 45-degree angle to the radial direction of the sewage tank (10). The multiple nozzles (233) are used to spray sewage at the 45-degree angle.

5. A multi-stage cyclonic floating oil skimming device according to claim 1, wherein The limiting mechanism (30) includes: Guide rail (31), the guide rail (31) is set vertically on the inner wall of the sewage tank (10); A limiting support arm (32) is arranged in a horizontal position on the guide rail (31) along the radial direction of the sewage tank (10). The limiting support arm (32) slides vertically on the guide rail (31) to restrict the buoyancy mechanism (40) to move only along the axial direction of the sewage tank (10). A limiting rod (33) is mounted on the guide rail (31) and is used to limit the highest position that the limiting support arm (32) can move along the guide rail (31).

6. A multi-stage cyclonic floating oil skimming device according to claim 5, wherein, The limiting support arm (32) includes a straight rod (321) and a V-shaped limiting groove (322). The V-shaped limiting groove (322) is fixed to the first end of the straight rod (321) and is installed correspondingly to the guide rail (31) to limit the limiting support arm (32) to move only in the vertical direction.

7. A multi-stage cyclonic floating oil collection device according to claim 6, wherein, The sewage tank (10) is also provided with a water distribution hole (12), and the buoyancy mechanism (40) includes: Multiple floats (41) are evenly spaced along the radial direction of the sewage tank (10) and connected to the second end of multiple limiting support arms (32) in a corresponding manner. The multiple floats (41) float in the sewage to provide buoyancy to the buoyancy mechanism (40). A counterweight box (42) is movably disposed in the inner cavity of the sewage tank (10) along the axial direction of the sewage tank (10) and connected to a plurality of floats (41). The counterweight box (42) is used to adjust the buoyancy of the buoyancy mechanism (40). The counterweight box (42) is provided with a counterweight inlet. The counterweight regulating pipe (43) has its first end inserted into the water distribution hole (12) and its second end connected to the counterweight inlet. The counterweight regulating pipe (43) is used to supply water to the counterweight box (42).

8. A multi-stage cyclonic floating oil collection device according to claim 7, wherein, The buoyancy mechanism (40) also includes a bracket (44) which is installed at the bottom of the counterweight box (42) and is used to support the counterweight box (42) when the counterweight box (42) is moved to the bottom of the sewage tank (10).

9. A multi-stage cyclonic floating oil skimming device according to claim 7, wherein, The counterweight box (42) has a mounting position (421) at its center, which is used to mount the oil collection mechanism (50).

10. A multi-stage cyclonic floating oil collection device according to claim 9, wherein, The wastewater tank (10) is also provided with an oil outlet (13), and the oil collection mechanism (50) includes: Oil collection tank (51), the oil collection tank (51) is installed on the installation position (421), the oil collection tank (51) is used to collect the oil liquid on the upper layer of sewage, and the bottom of the oil collection tank (51) is provided with an oil outlet; The oil collection pipe (52) has its first end inserted into the oil outlet (13) and its second end connected to the oil outlet. The oil collection pipe (52) is used to guide the collected oil to the outside of the sewage tank (10).

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