An oil-water separation device

Abstract

The application discloses an oil-water separation device, which comprises a first filter module and a flow buffer, the flow buffer is connected with a liquid outlet of the first filter module, an outlet end of the flow buffer is connected with an oil-water separation module, a water phase separation area and an oil phase separation area are arranged in the oil-water separation module, and the separation device further comprises an oil-water diverter, a water drainage cavity and an oil drainage cavity which are separated from each other are arranged in the oil-water diverter, the water drainage cavity is communicated with the water phase separation area, and the oil drainage cavity is communicated with the oil phase separation area. Compared with the prior art, the separated waste liquid completely relies on its own gravity to flow in the separation device, and no additional power equipment is needed. Meanwhile, the structure of the separation device is simplified to the maximum extent, and the separation device is more compact, thereby meeting the connection requirements of daily pipelines. The combination and cooperation of the gravity drainage and different function modules such as pre-separation, flow buffering and oil-water separation meet the use requirements of the household oil-water separation scene.

Description

Technical Field

[0001] This application relates to the field of environmental protection equipment technology, specifically to an oil-water separation device. Background Technology

[0002] Oil-water separation is a crucial step in environmental water treatment and domestic sewage discharge. Current mainstream technologies mainly fall into two categories: gravity sedimentation and membrane separation. However, both technologies suffer from significant technical bottlenecks and functional deficiencies in practical applications. Traditional gravity oil separators lack rectifying or flow-slowing structures, allowing oily wastewater to enter the chamber at high speed and directly impact the separation zone, causing severe turbulence and disrupting the oil-water interface. Furthermore, gravity sedimentation alone can only separate large, dispersed oil particles, proving completely ineffective against tiny oil droplets and emulsified oil in catering wastewater and machining emulsions, resulting in severely excessive oil content in the effluent. Existing membrane separation equipment relies on external water pumps for pressure, leading to high energy consumption, noise levels, and complex structures; it is also unsuitable for residential kitchens, bathrooms, and other non-powered piping environments. Utility Model Content

[0003] The main objective of this application is to provide an oil-water separation device that addresses the shortcomings of existing technologies in terms of adaptability to household non-powered pipeline scenarios.

[0004] This application achieves the above objectives through the following technical solutions: An oil-water separation device, comprising: The first filtration module has its inlet connected to the drain pipe and is used to separate and remove solid residues from the liquid to be filtered. A flow retarder is connected to the drain port of the first filter module and is used to reduce the flow rate of wastewater discharged from the first filter module. An oil-water separation module is provided, wherein the inlet end of the oil-water separation module is connected to the outlet of the flow buffer, and the oil-water separation module is provided with an aqueous phase separation zone and an oil phase separation zone. An oil-water separator is provided, wherein a drain chamber and an oil drain chamber are provided inside the oil-water separator, the drain chamber being connected to the water phase separation zone; and the oil drain chamber being connected to the oil phase separation zone.

[0005] Optionally, the first filtration module includes a separation shell, with a feed inlet at the top and a drain outlet at the bottom; a slag outlet is also provided on the outer circumferential surface of the separation shell; a filter screen is provided inside the separation shell, and the slag outlet is located above the filter screen along the height direction of the separation shell.

[0006] Optionally, a support plate is also provided inside the separation shell, and the support plate is provided with a plurality of leakage holes; the support plate is integrally connected to the separation shell, and the filter screen is placed on the support plate; around the axial direction of the separation shell, a plurality of limiting blocks are also provided on the inner surface of the separation shell, and the top surface of the filter screen is tightly fitted to each of the limiting blocks.

[0007] Optionally, the flow slower includes a flow slowing shell, with an inlet at one end and an outlet at the other end along the axial direction of the flow slowing shell; a flow slowing plate coaxial with the flow slowing shell is also provided inside the flow slowing shell, and a plurality of baffles are provided on the outer circumferential surface of the flow slowing plate around the axial direction of the flow slowing plate.

[0008] Optionally, the flow deflectors are evenly arranged around the axis of the flow deflector, with one end of each flow deflector connected to the flow deflector and the other end of each flow deflector offset in a clockwise or counterclockwise direction and connected to the inner surface of the flow deflector shell.

[0009] Optionally, the oil-water separation module includes a base, on which an annular partition is disposed coaxially. Along the radial direction of the base, one side of the annular partition is an aqueous phase separation zone, and the other side is an oil phase separation zone. A hydrophobic separation membrane is disposed in the aqueous phase separation zone, and an oleophobic separation membrane is disposed in the oil phase separation zone. Both the aqueous phase separation zone and the oil phase separation zone are provided with a plurality of drainage holes.

[0010] Optionally, the oil-water separation module further includes a fixing ring, on which an annular groove is provided, and the annular partition is inserted into the annular groove; the fixing ring is tightly fitted to the hydrophobic separation membrane and the oleophobic separation membrane respectively.

[0011] Optionally, the oil-water separation module further includes several limiting blocks, each of which is arranged on the outside of the fixing ring along the radial direction of the base, and each of the limiting blocks is in close contact with the hydrophobic separation membrane or the oleophobic separation membrane.

[0012] Optionally, the oil-water separator includes a separator housing, an isolation ring coaxial with the separator housing, and a sealing ring, which is sealed to the bottom of the isolation ring. Along the radial direction of the separator housing, one side of the isolation ring is a drain chamber and the other side is an oil drain chamber. The separator housing is provided with a drain pipe communicating with the drain chamber, and the sealing ring is provided with an oil drain hole communicating with the oil drain chamber.

[0013] Optionally, the sealing ring is inclined, and the drain pipe is connected to the lowest point of the drain cavity.

[0014] Compared with the prior art, this application has the following beneficial effects: This application includes a first filtration module and a flow buffer. The flow buffer is connected to the drain port of the first filtration module, and the outlet end of the flow buffer is connected to an oil-water separation module. The oil-water separation module is provided with an aqueous phase separation zone and an oil phase separation zone. The separation device also includes an oil-water separator, which is provided with a drain chamber and an oil drain chamber that are separated from each other. The drain chamber is connected to the aqueous phase separation zone, and the oil drain chamber is connected to the oil phase separation zone.

[0015] In use, the inlet of the first filter module is connected to the external sewage pipe to receive the discharged wastewater. The first filter module initially separates solid residue from waste liquid. The waste liquid enters the flow buffer through the drain port, which reduces the flow rate of the waste liquid, allowing it to enter the oil-water separation module more smoothly. In the oil-water separation module, the waste liquid enters the aqueous phase separation zone and the oil phase separation zone respectively. The aqueous phase separation zone allows water to pass through but blocks oil, while the oil phase separation zone does the opposite, thus achieving simultaneous separation of the aqueous and oil phases. The separated wastewater enters the drain chamber of the oil-water separator, while the waste oil enters the oil discharge chamber, thus being discharged separately by the oil-water separator.

[0016] The oil-water separation device described in this application includes solid-liquid separation, slow flow, oil-water separation, and drainage processes. Compared with the prior art, the waste liquid to be separated flows entirely by its own gravity inside the separation device without the need for additional power equipment. This helps to reduce the complexity and cost of the equipment, while also effectively improving the stability and reliability of the equipment and reducing its energy consumption.

[0017] Secondly, the flow rate of the fluid can be effectively controlled by the flow slower, reducing the impact force of the waste liquid flow, thereby ensuring the smooth separation of the water phase and oil phase in the oil-water separation module and ensuring the efficiency of oil-water separation.

[0018] Finally, the structure of the separation device described in this application has been simplified to the greatest extent, making it more compact and thus meeting the connection requirements of daily pipelines. At the same time, the combination and synergy of different functional modules such as gravity diversion, pre-separation, slow flow and oil-water separation meet the usage needs of household oil-water separation scenarios. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the oil-water separation device provided in Embodiment 1 of this application; Figure 2 An exploded view of the oil-water separation device provided in Embodiment 1 of this application; Figure 3 This is a schematic diagram of the structure of the first filtering module; Figure 4 This is a schematic diagram of the flow slower; Figure 5 A schematic diagram of the flow regulator from below; Figure 6 This is a schematic diagram of the oil-water separation module; Figure 7 This is a schematic diagram of an oil-water separator. Reference numerals: 1-First filtration module, 2-Flow slower, 3-Oil-water separation module, 4-Oil-water separator, 101-Separation shell, 102-First inlet, 103-Drain outlet, 104-Slag outlet, 105-Filter screen, 106-Support plate, 107-Leakage hole, 108-Limiting block, 201-Flow slower shell, 202-Second inlet, 203-Outlet, 204-Flow slower plate, 205-Baffle plate 301-Base, 302-Annular partition, 303-Aqueous phase separation zone, 304-Oil phase separation zone, 305-Hydrophobic separation membrane, 306-Oleophobic separation membrane, 307-Drain hole, 308-Fixing ring, 309-Annular groove, 310-Restriction block, 401-Diverter shell, 402-Isolation ring, 403-Sealing ring, 404-Drain cavity, 405-Oil drainage cavity, 406-Drain pipe, 407-Oil drainage hole.

[0020] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] Implementation Method 1

[0025] This embodiment, as an optional embodiment of this application, discloses an oil-water separation device. Figure 1 This is a schematic diagram of an oil-water separator. Figure 2 This is an exploded view of an oil-water separation unit. Figure 3 This is a schematic diagram of the structure of the first filtering module 1, referencing... Figures 1 to 3 The oil-water separation device includes a first filter module 1 and a flow buffer 2. The first filter module 1 includes a separation shell 101 and a filter screen 105. The separation shell 101 is generally arranged in a cylindrical tubular structure. Along the axial direction of the separation shell 101, a first feed inlet 102 is provided at the top of the separation shell 101, and a drain outlet 103 is provided at the bottom of the separation shell 101. At the same time, a support plate 106 is also provided inside the separation shell 101. The support plate 106 is provided on one side of the drain outlet 103, and the separation shell 101 and the support plate 106 are integrally connected. Along the axial direction of the separation shell 101, the cavity between the support plate 106 and the first feed port 102 is a separation cavity. A slag discharge port 104 is provided on the outer peripheral surface of the separation shell 101. The slag discharge port 104 is connected to the separation cavity so as to discharge solid residue through the slag discharge port 104. Meanwhile, a filter screen 105 is also placed on the side of the support plate 106 directly opposite the first feed inlet 102, and the slag discharge port 104 is located on the upper side of the filter screen 105. Furthermore, around the axial direction of the separation housing 101, a plurality of limiting blocks 108 are also provided on the inner surface of the separation housing 101, and the top surface of the filter screen 105 is in close contact with each of the limiting blocks 108; at the same time, a plurality of leakage holes 107 are evenly arranged on the support plate 106, preferably, each of the leakage holes 107 is a regular hexagonal structure. The regular hexagonal structure has high strength and strong resistance to deformation, similar to a honeycomb structure. Compared with square holes, the hexagonal structure can make the stress distribution around the hole more uniform; compared with circular holes (with the same hole wall thickness and the same hole diameter), the regular hexagonal structure has stronger resistance to bending. Secondly, the regular hexagonal structure is the most compact planar close-packed structure, with an effective flow area that is 12% to 15% higher than that of a square structure and 8% to 10% higher than that of a circle. When oil-water mixtures pass through, the pressure drop is small and the throughput is higher. At the same time, the holes in the regular hexagonal close-packed structure are symmetrically and evenly distributed, and the flow velocity difference is small at various parts of the plate surface, avoiding the occurrence of local high-speed turbulence and local static dead zones.

[0026] In use, wastewater is received through the first feed port 102. After the wastewater enters the separation chamber, it is blocked by the filter screen 105. Solid residue is retained in the separation chamber, while the waste liquid passes through the filter screen 105 and enters the drain port 103 through the various holes 107 on the support plate 106 and is finally discharged. At the same time, under the impact of the waste liquid, some waste liquid, together with the solid residue obtained by filtration, will be discharged from the slag discharge port 104. After secondary separation, the waste residue is discharged, while the waste liquid re-enters the separation shell 101 for secondary circulation separation. In addition, the slag discharge port 104 can be blocked during daily work. When it is necessary to remove solid residue, the residue can be discharged from the slag discharge port 104 by rinsing with clean water. Furthermore, along the radial direction of the separation shell 101, the first feed port 102 and the slag discharge port 104 are respectively placed on both sides of the separation shell 101. At the same time, the support plate 106 and the filter screen 105 are inclined, and the slag discharge port 104 is connected to the lowest point of the filter screen 105. That is, when the filter screen 105 is inclined, it must have a lowest point and a highest point. The slag discharge port 104 is connected to the lowest point to ensure that all materials are discharged. With the first feed inlet 102 biased and the filter screen 105 tilted, the waste liquid entering the separation shell 101 will directly impact the solid residue and guide the solid residue to flow towards the slag discharge port 104. During the flow, the solid residue and waste liquid entering the waste liquid will be separated simultaneously. Finally, while achieving solid separation, the residual solid residue will be continuously pushed into the slag discharge port 104 and eventually discharged. This achieves simultaneous slag discharge and liquid discharge, avoiding blockage of the first filter module 1 due to the large accumulation of solid residue after long-term use, and effectively ensuring the separation efficiency of the first filter module 1.

[0027] Furthermore, Figure 4 This is a schematic diagram of the flow regulator, refer to... Figure 4The flow retarder 2 includes a flow retarder shell 201, which is cylindrical in shape. Along the axial direction of the flow retarder shell 201, the top end of the flow retarder shell 201 is a second feed inlet 202, and the bottom end is a discharge outlet 203. The flow retarder shell 201 is coaxially arranged with the separation shell 101 and connected by several connecting bolts. At the same time, the second feed inlet 202 is directly connected to the discharge outlet 103. A flow-slowing plate 204 is also provided inside the flow-slowing shell 201. The flow-slowing plate 204 is a circular plate and is arranged coaxially with the flow-slowing shell 201. Along the axial direction of the flow-slowing shell 201, one end face of the flow-slowing plate 204 faces the second feed inlet 202, and the other end faces the discharge outlet 203. Around the axial direction of the flow-slowing plate 204, a plurality of baffles 205 are provided on the outer circumferential surface of the flow-slowing plate 204. Along the radial direction of the flow-slowing shell 201, one end of each baffle is integrally connected to the outer circumferential surface of the flow-slowing plate 204, and the other end is integrally connected to the inner wall of the flow-slowing shell 201, thereby stably connecting the flow-slowing plate 204 and the flow-slowing shell 201. The gap between any two adjacent baffles 205 is used for leakage of waste liquid. Furthermore, around the axial direction of the flow-retarding plate 204, the end of each flow-deflecting plate 205 connected to the flow-retarding shell 201 is offset in a clockwise or counterclockwise direction, and the offset angle of each flow-deflecting plate 205 is the same.

[0028] When the waste liquid discharged from the first filtration module 1 enters the slow-flow shell 201 through the drain port 103 and the second inlet port 202, it will directly impact the slow-flow plate 204, then flow along the radial direction of the slow-flow shell 201, and finally flow into the lower side of the slow-flow plate 204 from the gaps between each baffle 205, and finally be discharged from the outlet port 203. At the same time, some waste liquid will flow along the inside of the slow-flow shell 201 to the outlet port 203 and finally be discharged. This application slows down the waste liquid by colliding with the flow buffer 204, thereby reducing its impact on subsequent equipment and effectively ensuring the separation effect. At the same time, due to the offset of each baffle 205, the gap between any two adjacent baffles 205 will also be offset. Multiple offset gaps will guide the waste liquid to flow along the oblique tangent through the inner wall of the flow buffer shell 201 and finally be discharged, thereby extending the flow path of the waste liquid and thus regulating the flow rate.

[0029] Secondly, due to the limited gap between the baffles 205, when the flow rate is large, some waste liquid will be retained on the upper side of the flow buffer 204, thereby regulating the flow rate; at the same time, the retained liquid can also buffer the subsequent waste liquid, which is conducive to further improving the flow buffering effect.

[0030] Furthermore, Figure 6 This is a structural schematic diagram of oil-water separation module 3, referencing... Figure 6 The oil-water separation device further includes an oil-water separation module 3 and an oil-water separator 4. The oil-water separation module 3 includes a base 301, which is circular in shape. The base 301 is located at the outlet 203 of the slow-flow shell 201 and is coaxially connected to the slow-flow shell 201. An annular partition 302 is integrally connected to the end face of the base 301 and the discharge port 203, and the annular partition 302 is coaxially arranged with the base 301. Along the radial direction of the base 301, one side of the annular partition 302 is a water phase separation zone 303, and the other side is an oil phase separation zone 304; preferably, referring to Figure 6 The aqueous phase separation zone 303 is the annular area outside the annular partition 302, and the oil phase separation zone 304 is the circular area inside the annular partition 302. It should be noted that the aqueous phase separation zone 303 and the oil phase separation zone 304 can be interchanged. If they are interchanged, the structure can be adjusted accordingly. The areas of the aqueous phase separation zone 303 and the oil phase separation zone 304 can be the same or different, depending on actual needs, and can be adjusted by adjusting the size of the annular partition 302.

[0031] The base 301 is also provided with a plurality of drain holes 307 penetrating the base 301. Each drain hole 307 is respectively arranged in the aqueous phase separation zone 303 and the oil phase separation zone 304 to drain the separated liquid. A hydrophobic separation membrane 305 is provided in the aqueous phase separation zone 303, and an oleophobic separation membrane 306 is provided in the oil phase separation zone 304. The shape of the hydrophobic separation membrane 305 is adapted to the shape of the aqueous phase separation zone 303, and the shape of the oleophobic separation membrane 306 is adapted to the shape of the oil phase separation zone 304, so as to ensure that each separation zone is completely filled and to avoid leakage points affecting the separation quality. The hydrophobic separation membrane 305 is made of modified polytetrafluoroethylene / polypropylene, and the oleophobic separation membrane 306 is made of natural sepiolite / zwitterionic polyurethane. The hydrophobic separation membrane 305 allows the aqueous phase to pass through while blocking the oil phase, while the oleophobic separation membrane 306 does the opposite.

[0032] Furthermore, the oil-water separation module 3 also includes a fixing ring 308. Along the axial direction of the fixing ring 308, one end face of the fixing ring 308 is provided with a concave annular groove 309. After assembly, the annular partition 302 is inserted into the annular groove 309, and the annular partition 302 and the annular groove 309 are interference fit to ensure the connection stability between the fixing ring 308 and the annular partition 302. Figure 5 This is a bottom view of the flow modulator's structure, for reference. Figure 5 Around the axis of the fixed ring 308, a plurality of connecting rods are provided on the outer circumferential surface of the fixed ring 308. The fixed ring 308 is integrally disposed at one end of the discharge port 203 of the slow flow shell 201, and each of the connecting rods is connected to the inner surface of the slow flow shell 201.

[0033] Meanwhile, the end face of the fixed ring 308 with the annular groove 309 is also closely attached to the hydrophobic separation membrane 305 and the oleophobic separation membrane 306 respectively. The oil-water separation module 3 also includes several limiting blocks 310, each of which is an arc-shaped structure. Along the radial direction of the base 301, each limiting block 310 is arranged on the outside of the fixing ring 308. At the same time, around the axial direction of the base 301, each limiting block 310 is evenly arranged and connected to the outer inner wall of the water phase separation zone 303. The bottom surface of each limiting block 310 is in close contact with the hydrophobic separation membrane 305. It should be noted that if the positions of the aqueous phase separation zone 303 and the oil phase separation zone 304 are interchanged, the bottom surface of each of the limiting blocks 310 will be in close contact with the oleophobic separation membrane 306. The fixing ring 308 and each limiting block 310 cooperate to fix the hydrophobic separation membrane 305 and the oleophobic separation membrane 306, ensuring the stability and reliability of the entire device, avoiding leakage gaps, and ensuring separation quality.

[0034] Furthermore, Figure 7 This is a schematic diagram of the oil-water separator, referencing... Figure 7The oil-water separator 4 includes a separator shell 401, which is cylindrical in shape and located on the lower side of the base 301 along the vertical direction. The separator shell 401 is coaxially connected to the base 301. An isolation ring 402 and a sealing ring 403 are provided inside the separator shell 401. The isolation ring 402 is coaxially arranged with the separator shell 401, thereby dividing the internal space of the separator shell 401 into two spaces along the radial direction of the separator shell 401. One side of the isolation ring 402 is a drain chamber 404, and the other side is an oil drain chamber 405. Preferably, the oil drain chamber 405 is located on the lower side of the base 301. The space outside the isolation ring 402 is a drain chamber 404, and the space inside the isolation ring 402 is an oil drain chamber 405. It should be noted that the arrangement of the drain chamber 404 and the oil drain chamber 405 needs to correspond to the aforementioned aqueous phase separation zone 303 and oil phase separation zone 304 to ensure that the drain chamber 404 is connected to the aqueous phase separation zone 303 and the oil drain chamber 405 is connected to the oil phase separation zone 304. The drain chamber 404 is connected to the aqueous phase separation zone 303 through a drain hole 307 located in the aqueous phase separation zone 303, and the oil drain chamber 405 is connected to the oil phase separation zone 304 through a drain hole located in the oil phase separation zone 304. The sealing ring 403 is arranged on the lower side of the isolation ring 402, and the top surface of the sealing ring 403 is integrally connected with the bottom surface of the isolation ring 402. The outer peripheral surface of the sealing ring 403 is connected to the inner wall of the diversion shell 401. An oil drain hole 407 is provided in the middle of the sealing ring 403. The oil drain hole 407 is located at the bottom of the oil drain cavity 405 and communicates the oil drain cavity 405 with the external space. The drainage chamber 404 and the oil drain chamber 405 are completely isolated by the cooperation of the isolation ring 402 and the sealing ring 403, thereby realizing the separation of water and oil and avoiding secondary mixing. Moreover, the above structure is simple and can effectively improve the stability and reliability of equipment operation. Furthermore, the sealing ring 403 is inclined, and a drain pipe 406 is also provided on the outer peripheral surface of the diversion shell 401. The drain pipe 406 is connected to the drain cavity 404, and the drain pipe 406 is located at the lowest point of the drain cavity 404.

[0035] The inclined sealing ring 403 enables the diversion of separated water, thereby achieving rapid drainage.

[0036] When the oil-water separation device described in this application is in use, the oil-water mixture to be separated enters the first filter module from the feed inlet. In the first filter module, solid residues are separated by the filter screen. The separated solid residues are discharged from the slag outlet, while the waste liquid passes through the filter screen and enters the flow buffer. Waste liquid entering the flow buffer is slowed down by impact with the flow buffer plate, thus entering the oil-water separation module at a lower speed. In the aqueous phase separation zone, the oil phase liquid is blocked by the hydrophobic separation membrane, while the waste water passes through. In the oil phase separation zone, the opposite is true. Thus, oil and water are separated by two separation membranes with different properties. The separated oil enters the oil discharge chamber, while the waste water enters the drainage chamber and is finally discharged through the oil discharge hole and the drainage pipe.

[0037] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An oil-water separation device, characterized in that, include: The first filter module (1) is connected to the drain pipe and is used to separate and remove solid residues in the liquid to be filtered. A flow retarder (2) is connected to the drain port (103) of the first filter module (1). The flow retarder (2) is used to reduce the flow rate of the wastewater discharged from the first filter module (1). Oil-water separation module (3), the inlet end of which is connected to the flow buffer (2), and the oil-water separation module (3) is provided with a water phase separation zone (303) and an oil phase separation zone (304); An oil-water separator (4) is provided with a drain chamber (404) and an oil drain chamber (405) that are separated from each other. The drain chamber (404) is connected to the water phase separation zone (303); the oil drain chamber (405) is connected to the oil phase separation zone (304).

2. The oil-water separation device according to claim 1, characterized in that, The first filtration module (1) includes a separation shell (101), a first feed inlet (102) is provided at the top of the separation shell (101), and a drain outlet (103) is provided at the bottom of the separation shell (101); a slag outlet (104) is also provided on the outer peripheral surface of the separation shell (101); a filter screen (105) is provided inside the separation shell (101), and the slag outlet (104) is located on the upper side of the filter screen (105) along the height direction of the separation shell (101).

3. The oil-water separation device according to claim 2, characterized in that, The separation housing (101) is also provided with a support plate (106), and the support plate (106) is provided with a plurality of drainage holes (107); the support plate (106) is integrally connected to the separation housing (101), and the filter screen (105) is placed on the support plate (106); around the axial direction of the separation housing (101), the inner surface of the separation housing (101) is also provided with a plurality of limiting blocks (108), and the top surface of the filter screen (105) is tightly fitted with each of the limiting blocks (108).

4. The oil-water separation device according to claim 1, characterized in that, The flow retarder (2) includes a flow retarder shell (201). Along the axial direction of the flow retarder shell (201), a second inlet (202) is provided at one end of the flow retarder shell (201), and a outlet (203) is provided at the other end. A flow retarder plate (204) coaxial with the flow retarder shell (201) is also provided inside the flow retarder shell (201). Around the axial direction of the flow retarder plate (204), a plurality of baffles (205) are provided on the outer circumferential surface of the flow retarder plate (204).

5. The oil-water separation device according to claim 4, characterized in that, Around the axis of the flow-slowing plate (204), each of the flow-deflecting vanes (205) is evenly arranged. One end of each of the flow-deflecting vanes (205) is connected to the flow-slowing plate (204), and the other end of each of the flow-deflecting vanes (205) is offset in a clockwise or counterclockwise direction and is connected to the inner surface of the flow-slowing shell (201).

6. The oil-water separation device according to claim 1, characterized in that, The oil-water separation module (3) includes a base (301), on which an annular partition (302) is provided on the base (301) and coaxial with it. Along the radial direction of the base (301), one side of the annular partition (302) is a water phase separation zone (303) and the other side is an oil phase separation zone (304). A hydrophobic separation membrane (305) is provided in the water phase separation zone (303) and an oleophobic separation membrane (306) is provided in the oil phase separation zone (304). Both the water phase separation zone (303) and the oil phase separation zone (304) are provided with a plurality of drain holes (307).

7. The oil-water separation device according to claim 6, characterized in that, The oil-water separation module (3) further includes a fixing ring (308), on which an annular groove (309) is provided, and the annular partition (302) is inserted into the annular groove (309); the fixing ring (308) is tightly fitted to the hydrophobic separation membrane (305) and the oleophobic separation membrane (306) respectively.

8. The oil-water separation device according to claim 7, characterized in that, The oil-water separation module (3) also includes several limiting blocks (310). Along the radial direction of the base (301), each limiting block (310) is arranged on the outside of the fixing ring (308), and each limiting block (310) is in close contact with the hydrophobic separation membrane (305) or the oleophobic separation membrane (306).

9. The oil-water separation device according to claim 1, characterized in that, The oil-water separator (4) includes a separator housing (401), an isolation ring (402) coaxial with the separator housing (401), and a sealing ring (403) sealed to the bottom of the isolation ring (402). Along the radial direction of the separator housing (401), one side of the isolation ring (402) is a drain chamber (404), and the other side is an oil drain chamber (405). A drain pipe (406) communicating with the drain chamber (404) is provided on the separator housing (401), and an oil drain hole (407) communicating with the oil drain chamber (405) is provided on the sealing ring (403).

10. The oil-water separation device according to claim 9, characterized in that, The sealing ring (403) is inclined, and the drain pipe (406) is connected to the lowest point of the drain cavity (404).

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