A kind of oil-water separation tank for road gully

Abstract

The present application relates to a kind of oil-water separation tank for road rainwater inlet.The oil-water separation tank overflow board, oil stain adsorption mechanism, water baffle and outer box are provided.A drainage port is formed in the inner wall of one side of the outer box.The overflow board is installed in the outer box with downward inclination.The overflow channel close to the drainage port and the water inlet channel away from the drainage port are formed between the overflow board and the inner wall of the outer box.The oil stain adsorption mechanism is detachably installed in the outer box, and located directly below the overflow board.The water baffle is detachably connected to the bottom surface of the outer box.The top end of the water baffle is higher than the bottom surface of the oil stain adsorption mechanism and lower than the top surface of the oil stain adsorption mechanism.The oil stain adsorption mechanism is used to adsorb oil stain in rainwater, and when the rainwater flow rate is large, the oil stain is intercepted above the overflow board by the overflow board, and a small amount of rainwater containing oil stain is discharged from the drainage port, so that the total oil content in the discharged rainwater is lower than the discharge standard, and effective separation and efficient discharge of rainwater are achieved.

Description

Technical Field

[0001] This invention relates to an oil-water separator, and more particularly to an oil-water separator for use in road storm drains. Background Technology

[0002] During rainy weather, rainwater flows along the road and into nearby storm drains, then through connecting pipes and finally into receiving water bodies via drainage channels. Because roads contain pollutants such as oil and sediment, rainwater needs to be filtered during discharge to prevent these contaminants from flowing into the receiving water bodies and causing further pollution.

[0003] Oil stains are a very difficult source of pollution to treat. Ordinary filtration devices can only filter solid impurities, while oil stains will stick to the filter, causing blockages and reducing the efficiency of rainwater treatment. Under conditions of high rainwater velocity and flow rate, oil stains in rainwater are difficult to separate quickly, and rainwater becomes blocked in the drain outlets, preventing smooth drainage of rainwater from roads. The oil stains in the rainwater cause secondary pollution to roads and disrupt road traffic. Summary of the Invention

[0004] Therefore, it is necessary to provide an oil-water separator for road storm drains to address the problem of low oil-water separation efficiency in existing road storm drain systems.

[0005] The present invention is achieved through the following technical solution: an oil-water separator for road storm drains includes: an overflow plate, an oil adsorption mechanism, an oil separator, a water baffle, a grille, and an outer casing.

[0006] The outer casing opens upwards and is installed inside the rainwater inlet. An overflow plate is tilted downwards and detachably installed inside the outer casing. An overflow channel is formed between the top of the overflow plate and the inner wall of the outer casing containing the drain outlet, and a water inlet channel is formed between the bottom of the overflow plate and the inner wall of the outer casing on the other side. An oil stain absorption mechanism is detachably installed inside the outer casing, located directly below the overflow plate. The oil stain absorption mechanism includes multiple oil-absorbing plates. These plates are fixedly connected to form a mesh structure, creating multiple horizontal and vertical rainwater channels within the mechanism. A baffle plate is detachably connected to the bottom surface of the outer casing. The baffle plate is parallel to the inner wall of the outer casing containing the drain outlet. The bottom of the baffle plate is flush with the bottom surface of the outer casing, and the top of the baffle plate is higher than the bottom surface and lower than the top surface of the oil stain absorption mechanism.

[0007] The baffle and overflow plate divide the inner cavity of the outer casing into a pretreatment chamber, a drainage chamber, and an overflow chamber. The pretreatment chamber is located below the overflow plate on the side away from the drain outlet. The drainage chamber is located below the overflow plate on the side closer to the drain outlet. The overflow chamber is located above the overflow plate, with one end connected to the drainage chamber via an overflow channel, and the other end connected to the pretreatment chamber via an inlet channel. The pretreatment chamber is connected to the drainage chamber via the drainage channel between the baffle and the overflow plate.

[0008] The working process of the oil-water separator is as follows: Road rainwater flows along the overflow plate into the pretreatment chamber, where it is then adsorbed by the oil adsorption mechanism. Sediment in the rainwater is intercepted by the baffle plate within the pretreatment chamber. When the rainwater level is higher than the baffle plate, the oil-adsorbed rainwater flows into the drainage chamber through the drainage channel and is then discharged outside the outer casing through the drain outlet. Specifically, when the rainwater level is higher than the bottom but lower than the top of the oil adsorption mechanism, the rainwater can enter the vertical rainwater channel from the bottom or the horizontal rainwater channel from the side. When the rainwater level is higher than the top of the overflow plate, some rainwater flows sequentially through the pretreatment chamber and drainage channel into the drainage chamber, while the remaining portion flows directly into the drainage chamber through the overflow channel and is then discharged through the drain outlet.

[0009] When the road rainwater flow rate is low, the aforementioned oil-water separator guides the rainwater into the pretreatment chamber, where it comprehensively absorbs and settles oil, separating oil from other liquids and accumulating sediment within the chamber. This prevents oil or sediment from clogging drainage pipes or other filtration devices, ensuring smooth rainwater discharge. When the road rainwater flow rate is high, the rainwater level gradually rises above the overflow plate, transitioning from turbulent to laminar flow within the overflow chamber. The oil is at the top layer, above the bottom of the overflow plate, and most of it is trapped within the overflow chamber. Although a small portion of oil is discharged directly from the drain outlet through the overflow channel and drainage chamber, the total oil content in the discharged rainwater remains below emission standards. Sediment continues to accumulate at the bottom of the sewer outlet, further separating oil and sediment from the rainwater while maintaining the drainage rate, preventing clogging of drainage pipes or other filtration devices and achieving efficient rainwater discharge.

[0010] In one embodiment, the distance between the top of the overflow plate and the inner wall of the outer casing containing the drain outlet is not less than 2 cm to ensure smooth drainage of rainwater when the rainwater flow rate is high. The distance between the bottom of the overflow plate and the inner wall of the other side of the outer casing is 6-10 cm to ensure that the overall length and oil absorption area of ​​the rainwater and oil stain adsorption mechanism can meet the oil absorption requirements.

[0011] In one embodiment, the overflow plate is a L-shaped plate, with one side of the overflow plate arranged parallel to the side wall of the outer casing that includes the drain outlet, so that an overflow channel is formed between the overflow plate and the inner wall of the outer casing. The other side of the overflow plate is inclined downward and does not contact the other side wall of the outer casing, so that a water inlet channel is formed between the overflow plate and the other inner wall of the outer casing.

[0012] In one embodiment, the included angle between the two side plates of the overflow plate is in the range of 60° to 85°; the distance between the top of the overflow plate and the top of the outer casing is 6 to 10 cm.

[0013] In one embodiment, the oil-absorbing plate includes a substrate and an oil-absorbing layer. The substrate serves as a support component, and multiple substrates are fixedly connected to each other to form a grid-like structure, so that the oil-absorbing plate is installed as a whole inside the outer casing. The oil-absorbing layer covers the substrate and is used to absorb oil stains.

[0014] In one embodiment, two slide rails for mounting a baffle are disposed opposite each other on the inner wall of the outer casing. The two slide rails are vertically mounted on the inner wall of the outer casing. The baffle is vertically mounted along the slide rails and can move up and down on the slide rails. When the baffle is lowered to the bottom of the slide rail, the baffle is in contact with three sides of the outer casing.

[0015] In one embodiment, the oil separator is an inverted U-shaped plate. The oil separator is detachably connected to the side of the oil stain absorption mechanism near the baffle plate. The oil separator is located directly above the baffle plate, with its top end higher than the top surface of the oil stain absorption mechanism and lower than the top end of the overflow plate.

[0016] In one embodiment, a grille is installed on the top of the outer casing to filter solid pollutants in road rainwater that are larger than the grille openings.

[0017] In one embodiment, the grille is a hollow cuboid made of metal. The top of the grille has a flanged structure, and the outer casing has grooves that match the flanged structure. The bottom surface of the grille has a mesh structure with mesh openings of 10–20 mm wide.

[0018] In one embodiment, handles are provided on the inner walls of opposite sides of the grille, and the top surface of the handles is not higher than the top surface of the outer box.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. This invention addresses low-velocity rainwater runoff by guiding rainwater into a pretreatment chamber for comprehensive oil absorption and sedimentation. This separates oil from other liquids and allows sediment to accumulate within the pretreatment chamber, preventing blockages in drainage pipes or other filtration devices and ensuring smooth rainwater discharge. When rainwater runoff is high, the water level gradually rises above the overflow plate, transitioning from turbulent to laminar flow within the overflow chamber. Oil is at the top layer, above the bottom of the overflow plate, and most is trapped within the overflow chamber. While a small portion of oil is discharged directly from the drain outlet through the overflow channel and drainage chamber, the total oil content in the discharged rainwater remains below emission standards. Sediment continues to accumulate at the bottom of the sewer outlet, further separating oil and sediment from the rainwater while maintaining drainage speed, preventing blockages in drainage pipes or other filtration devices and achieving efficient rainwater discharge.

[0021] 2. This invention uses a baffle plate to intercept mud and sand in rainwater within the outer casing. During long-term oil-water separation, the rainwater level inside the outer casing will not be lower than the top of the baffle plate. By removing the entire outer casing and dismantling the baffle plate, the mud and sand in the rainwater can be flushed out in one go, preventing blockage of drainage pipes on the road.

[0022] 3. The present invention uses an inverted U-shaped oil separator plate so that when the rainwater level is higher than the oil adsorption mechanism, the rainwater is intercepted in the pretreatment chamber, avoiding direct discharge of oily rainwater and improving the efficiency of oil-water separation of road rainwater. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural schematic diagram of the oil-water separator for road storm drains according to Embodiment 1 of the present invention;

[0024] Figure 2 for Figure 1 A three-dimensional structural diagram of the oil-water separator after the outer casing has been removed;

[0025] Figure 3 for Figure 2 A schematic diagram of the main structure of the oil-water separator after the outer casing has been removed;

[0026] Figure 4 for Figure 1 A three-dimensional structural diagram of the inner and outer boxes;

[0027] Figure 5 for Figure 1 Cross-sectional view of the three-dimensional structure of the middle oil absorption plate;

[0028] Figure 6 for Figure 1 Schematic diagram of the cavity structure inside the inner and outer boxes.

[0029] Explanation of main component symbols

[0030] The following are the labels in the diagram: 1. Outer casing; 11. Drain outlet; 2. Overflow plate; 21. Guide rail; 3. Oil stain absorption mechanism; 31. Oil suction plate; 311. Base plate; 312. Oil absorption layer; 32. Slider; 4. Water baffle; 41. Slide rail; 5. Oil separator; 6. Grille; 61. Handle.

[0031] The above description of the main component symbols, together with the accompanying drawings and specific embodiments, provides a more detailed explanation of the present invention. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It should be noted that when a component is said to be "installed on" another component, it can be directly on the other component or it may be in a component that is centered on it. When a component is said to be "set on" another component, it can be directly set on the other component or it may also be in a component that is centered on it. When a component is said to be "fixed to" another component, it can be directly fixed to the other component or it may also be in a component that is centered on it.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0035] Example 1

[0036] Please see Figure 1 , Figure 2 and Figure 3 , Figure 1 This is a three-dimensional structural schematic diagram of the oil-water separator for road storm drains according to Embodiment 1 of the present invention; Figure 2 for Figure 1 A three-dimensional structural diagram of the oil-water separator after the outer casing has been removed; Figure 3 for Figure 2 A schematic diagram of the main structure of the oil-water separator after removing the outer casing. The oil-water separator used for road storm drains includes: an overflow plate 2, an oil sludge adsorption mechanism 3, an oil separator 5, a water baffle 4, a grille 6, and an outer casing 1.

[0037] Please combine Figure 4 , it is Figure 1 A three-dimensional structural diagram of the outer casing. The outer casing 1 is installed inside the rainwater inlet with its opening facing upwards. The rainwater inlet is a structure that collects rainwater in rainwater pipes or combined sewer systems. Rainwater on the street surface first flows through the rainwater inlet to the connecting pipe, and then flows into the receiving water body through the drainage pipe. A drain outlet 11 is provided at the bottom of one side wall of the outer casing 1. Rainwater flowing into the outer casing 1 is discharged into the drainage pipe through the drain outlet 11. The opening direction of the drain outlet 11 is consistent with the flow direction of rainwater in the drainage pipe to prevent rainwater from flowing back into the outer casing 1 from the drain outlet 11. In this embodiment, the outer casing 1 adopts a hollow inverted truncated pyramid structure that is larger at the top and smaller at the bottom. The opening of the outer casing 1 matches the road rainwater inlet. When the outer casing 1 is installed inside the rainwater inlet, the outer casing 1 fits snugly against the rainwater inlet on all four sides to prevent rainwater from seeping out from the gaps between the outer casing 1 and the rainwater inlet. The outer casing 1 includes two narrower sidewalls and two wider sidewalls, with a drain outlet 11 located on one of the narrower sidewalls. The diameter of the drain outlet 11 should ensure that, when the rainwater flow rate is at its maximum, the drainage velocity of the drain outlet 11 is not less than the inlet flow rate of the rainwater inlet. Alternatively, in other embodiments, the outer casing 1 can be a hollow cuboid or a hollow cylinder, as long as it matches the road rainwater inlet so that all rainwater flowing towards the rainwater inlet is collected inside the outer casing 1. Multiple drain outlets 11 can also be provided, similarly installed on the two wider sidewalls, as long as they meet the drainage requirements of the rainwater inlet and prevent untreated rainwater from being directly discharged from the drain outlets 11.

[0038] The overflow plate 2 is inclined downwards and detachably installed inside the outer casing 1. An overflow channel is provided between the top of the overflow plate 2 and the inner wall of the outer casing 1 containing the drain outlet 11, and a water inlet channel is provided between the bottom of the overflow plate 2 and the inner wall of the outer casing 1 on the other side. The overflow plate 2 is fitted against the other two wider inner walls of the outer casing 1 so that rainwater can only flow into the outer casing 1 through the overflow channel or the water inlet channel. The distance between the top of the overflow plate 2 and the inner wall of the outer casing 1 containing the drain outlet 11 is not less than 2 cm to ensure smooth drainage of rainwater when the rainwater flow rate is high. The distance between the bottom of the overflow plate 2 and the inner wall of the outer casing 1 on the other side is 6–10 cm to ensure that the overall length and oil absorption area of ​​the rainwater and oil stain adsorption mechanism 3 meet the oil absorption requirements.

[0039] The overflow plate 2 is a "7" shaped plate. One side of the overflow plate 2 is parallel to the side wall of the outer casing 1 containing the drain outlet 11, forming an overflow channel between the overflow plate 2 and the inner wall of the outer casing 1. The other side of the overflow plate 2 is inclined downwards and does not contact the other side wall of the outer casing 1, forming an inlet channel between the overflow plate 2 and the other inner wall of the outer casing 1. Compared with a straight plate, the overflow plate 2 with a "7" shape is easier to install or remove. At the same time, the overflow channel formed between the "7" shape plate and the inner wall of the outer casing 1 is more stable, and rainwater can flow directly into the bottom of the outer casing 1 through the overflow channel and then be discharged through the drain outlet 11. Two guide rails 21 for sliding connection of the overflow plate 2 are arranged opposite each other on the inner wall of the outer casing 1. The two guide rails 21 are vertically installed on the inner wall of the outer casing 1 on the side containing the drain outlet 11. The overflow plate 2 can be raised and lowered on the guide rails 21, thereby adjusting the height of the overflow plate 2 to facilitate the installation or removal of the overflow plate 2. When the overflow plate 2 adopts a "7"-shaped plate, it can also be fixedly connected to the guide rail 21 by bolts or snap-fit. For example, multiple mounting holes of different heights can be set on the side of the "7"-shaped plate that fits against the inner wall of the outer casing 1. By installing the "7"-shaped plate in the mounting holes at different heights, the distance between the overflow plate 2 and the oil stain adsorption mechanism 3 can be adjusted. The "7"-shaped plate can also be set as a foldable structure, with the two side plates of the "7"-shaped plate being able to be flipped and connected. The fixed connection between the two side plates can be achieved by adjusting bolts or other adjustment devices, so that the relative angle between the two side plates can be adjusted within a preset rotation range, thereby adjusting the tilt angle of the overflow plate 2 to suit rainwater treatment projects in different environments. In this embodiment, the included angle between the two side plates of the overflow plate 2 is set to 60° to 85°, and the distance between the top of the overflow plate 2 and the top of the outer casing 1 is set to 6 to 10 cm. Of course, in other embodiments, the included angle between the two side plates of the overflow plate 2 can be larger or smaller, and the distance between the top of the overflow plate 2 and the top of the outer casing 1 can also be larger or smaller.

[0040] The oil stain adsorption mechanism 3 is detachably installed inside the outer casing 1, and is located directly below the overflow plate 2. The oil stain adsorption mechanism 3 includes multiple oil-absorbing plates 31. These plates are fixedly connected to form a mesh structure, creating multiple horizontal and vertical rainwater channels within the mechanism. As rainwater flows through these channels, the oil stains are adsorbed by the oil-absorbing plates 31. Most of the rainwater flowing into the rainwater inlet converges on the overflow plate 2 and accumulates at the bottom of the outer casing 1. When the rainwater level is higher than the bottom surface of the oil stain adsorption mechanism 3, the oil stains are adsorbed and removed. Another portion of the rainwater flows directly into the bottom of the outer casing 1 along the overflow channel and is then discharged directly through the drain outlet 11. In practical applications, the rainwater is filtered and guided by the grille 6, and less than 1% of the total rainwater volume is discharged directly through the overflow channel. The total oil content of the discharged rainwater still meets emission standards.

[0041] Please combine Figure 5 , it is Figure 1 A three-dimensional cross-sectional view of the oil-absorbing plate. The oil-absorbing plate 31 includes a base plate 311 and an oil-absorbing layer 312. The base plate 311 serves as a supporting component, and multiple base plates 311 are fixedly connected to each other to form a grid-like structure, so that the oil-absorbing plate 31 is installed as a whole inside the outer casing 1. The oil-absorbing layer 312 covers the base plate 311 and is used to absorb oil stains. In other embodiments, the oil stain absorption mechanism 3 can also adopt an integrally formed grid-like structure, or the grid-like structure can be installed in a shell that runs vertically through the outer casing, which facilitates the overall installation of the oil stain absorption mechanism 3 inside the outer casing 1 and improves the efficiency of installation or disassembly.

[0042] The oil-absorbing layer 312 uses oleophilic and hydrophobic oil-absorbing cotton. This cotton effectively absorbs grease and grease, absorbing only oil and not water, and boasts advantages such as temperature resistance without deformation, large adsorption capacity, and wide adsorption area. Compared to using porous materials like diatomaceous earth or activated carbon molecular sieves for rainwater filtration, the oil-water separation process via the oil-absorbing cotton is less likely to cause filter clogging or drainage problems. Compared to using oil spill dispersants (oil removers) or alkaline decomposition substances for oil-water separation, the oil-absorbing cotton is less likely to cause secondary pollution, has lower costs, and is easier to maintain. Of course, in other embodiments, the oil-absorbing layer 312 can also be replaced with diatomaceous earth, activated carbon molecular sieves, oil spill dispersants, or alkaline decomposition substances.

[0043] At least two sliders 32 are fixedly connected to the outer wall of the oil stain adsorption mechanism 3, and a groove is provided on the inner wall of the outer casing 1 for the sliders 32 to move up and down. When the sliders 32 move up and down in the groove, the outer wall of the oil stain adsorption mechanism 3 is in contact with the inner wall of the outer casing 1. Alternatively, the sliders 32 can be fixedly connected to the oil stain adsorption mechanism 3 by an elastic support rod, which is inclined outward so that the sliders 32 extend beyond the top of the oil stain adsorption mechanism 3. The groove on the outer casing 1 is deeper at the top and shallower at the bottom. When the sliders 32 slide down inside the outer casing 1, the support rod retracts inward until the sliders 32 slide to the bottom of the groove. When using an elastic support rod, there is always a gap between the oil stain adsorption mechanism 3 and the outer casing 1 during installation or disassembly. The oil stain adsorption mechanism 3 can be pre-positioned by the elastic support rod and the sliders 32, which facilitates the installation or disassembly of the oil stain adsorption mechanism 3.

[0044] In other embodiments, the oil stain adsorption mechanism 3 can also be installed entirely within a vertically connected box, and then fixedly connected to the outer box 1 by a mounting bracket. The mounting bracket can be a square frame, horizontally positioned and fixedly connected to the inner wall of the outer box 1. The top of the oil stain adsorption mechanism 3 is provided with an outer ring bracket that matches the shape of the mounting bracket. When the oil stain adsorption mechanism 3 is installed inside the outer box 1 along the inner side of the mounting bracket, the outer ring bracket abuts against the mounting bracket and forms a sealing structure with the mounting bracket. This not only improves the efficiency of installing or removing the oil stain adsorption mechanism 3, but also prevents oily rainwater from directly seeping into the bottom of the outer box 1.

[0045] The baffle plate 4 is detachably connected to the bottom surface of the outer casing 1. The baffle plate 4 is parallel to the inner wall of the outer casing 1 on one side, which includes the drain outlet 11. The bottom end of the baffle plate 4 is in contact with the bottom surface of the outer casing 1, and the top end of the baffle plate 4 is higher than the bottom surface of the oil stain adsorption mechanism 3 but lower than the top surface of the oil stain adsorption mechanism 3. The rainwater that has absorbed the oil stains by the oil stain adsorption mechanism 3 is intercepted by the baffle plate 4 at the bottom of the outer casing 1. Solid impurities in the rainwater, such as silt, always settle at the bottom of the outer casing 1. When the rainwater level is higher than the top end of the baffle plate 4, the rainwater that has absorbed the oil is discharged through the drainage channel between the baffle plate 4 and the overflow plate 2.

[0046] The baffle plate 4 is a straight plate. Two slide rails 41 for mounting the baffle plate 4 are arranged opposite each other on the inner wall of the outer casing 1. The two slide rails 41 are vertically mounted on the inner wall of the outer casing 1. The baffle plate 4 is vertically mounted along the slide rails 41 and can move up and down on the slide rails 41. When the baffle plate 4 descends to the bottom of the slide rail 41, the baffle plate 4 is in contact with the outer casing 1 on three sides. To improve the sealing performance between the baffle plate 4 and the outer casing 1, a sealing gasket can also be fixedly connected to the outer edge of the baffle plate 4. When the baffle plate 4 descends along the slide rail 41 to be in contact with the bottom surface of the outer casing 1, the sealing gasket achieves a seal between the baffle plate 4 and the outer casing 1.

[0047] The bottom end of the baffle plate 4 has a through hole for rainwater to flow through. A plug is installed on the through hole. When the plug is removed from the through hole, the rainwater accumulated at the bottom of the outer casing 1 is discharged through the through hole and the drain outlet 11 in sequence. When the plug is installed in the through hole, the rainwater is intercepted at the bottom of the outer casing 1.

[0048] After rainwater flows into the outer casing 1, it accumulates at the bottom of the outer casing 1. The baffle plate 4 intercepts the mud and sand in the rainwater within the outer casing 1. During long-term oil-water separation, the rainwater level inside the outer casing 1 is never lower than the top of the baffle plate 4. By removing the entire outer casing 1 and dismantling the baffle plate 4, the mud and sand in the rainwater can be flushed out in one go, preventing blockage of drainage pipes on the road. A plug is installed on the baffle plate 4, allowing water inside the outer casing 1 to be drained directly by removing the plug, preventing the long-term accumulation of rainwater and the resulting odor.

[0049] Please combine Figure 6, it is Figure 1 A schematic diagram of the cavity structure inside the outer and middle casings. The baffle plate 4 and overflow plate 2 divide the inner cavity of the outer casing 1 into a pretreatment chamber, a drainage chamber, and an overflow chamber. The pretreatment chamber is located below the overflow plate 2 on the side away from the drain outlet 11. The drainage chamber is located below the overflow plate 2 on the side closer to the drain outlet 11. The overflow chamber is located above the overflow plate 2; one end of the overflow chamber is connected to the drainage chamber through an overflow channel, and the other end is connected to the pretreatment chamber through an inlet channel. The pretreatment chamber is connected to the drainage chamber through the drainage channel between the baffle plate 4 and the overflow plate 2.

[0050] The working process of the oil-water separator in this embodiment is as follows: Road rainwater flows along the overflow plate 2 into the pretreatment chamber, where it is then adsorbed by the oil adsorption mechanism 3. The mud and sand in the rainwater are intercepted by the baffle plate 4 within the pretreatment chamber. When the rainwater level is higher than the baffle plate 4, the rainwater, after oil absorption treatment, flows into the drainage chamber through the drainage channel and is then discharged outside the outer chamber 1 through the drain outlet 11. Specifically, when the rainwater level is higher than the bottom surface of the oil adsorption mechanism 3 but lower than its top surface, the rainwater can enter the vertical rainwater channel from the bottom surface of the oil adsorption mechanism 3 or the horizontal rainwater channel from the side surface of the oil adsorption mechanism 3. Because the rainwater settles directly into the pretreatment chamber, solid impurities in the rainwater will not clog the rainwater channel of the oil adsorption mechanism 3. Therefore, the aperture of the rainwater channel can be smaller than the pores of the grille 6. In this embodiment, the aperture of the rainwater channel is no greater than 1*1cm. Compared to rainwater entering the rainwater channel directly from above the oil stain adsorption mechanism 3, the aperture of the oil stain adsorption mechanism 3 can be set to be smaller. Correspondingly, the oil stain adsorption mechanism 3 has a larger oil absorption area and higher oil absorption efficiency.

[0051] When the rainwater level is higher than the top of the overflow plate 2, some rainwater flows into the drainage chamber through the pretreatment chamber and drainage channel in sequence, while the other part flows directly into the drainage chamber through the overflow channel and is then discharged through the drain outlet 11. When the rainwater flow rate on the road is too high, drainage through the channel between the baffle plate 4 and the oil stain adsorption mechanism 3 alone is insufficient to meet the drainage rate requirements. The overflow channel is used to discharge rainwater from the road, thereby increasing the rainwater discharge rate, meeting the road rainwater discharge requirements, and preventing rainwater from clogging the outer box 1 and causing larger-area pollution to the road.

[0052] In practical applications, rainwater flows from the road into the outer casing 1, and then through the overflow plate 2 into the pretreatment chamber. When the flow rate of the rainwater is less than the processing capacity of the oil adsorption mechanism 3, the rainwater level in the outer casing 1 is always lower than the top surface of the oil adsorption mechanism 3 but higher than the top of the baffle plate 4. The oil in the rainwater is fully adsorbed by the oil adsorption mechanism 3, and the oil content in the rainwater gradually falls below the discharge standard. After oil adsorption treatment, the rainwater is discharged into the drainage pipe through the drain outlet 11. When the flow rate of the rainwater is greater than the processing capacity of the oil adsorption mechanism 3, the rainwater gradually accumulates in the pretreatment chamber until the rainwater level is higher than the top surface of the overflow plate 2. A portion of the rainwater still flows into the drainage chamber sequentially through the pretreatment chamber and the drainage channel, while another portion flows directly into the drainage chamber through the overflow channel to maximize the drainage rate, avoid clogging of the rainwater outlet, and ensure smooth discharge of rainwater from the road.

[0053] The oil separator 5 is an inverted U-shaped plate. The oil separator 5 is detachably connected to the side of the oil stain adsorption mechanism 3 near the baffle plate 4. The oil separator 5 is located directly above the baffle plate 4, with its top end higher than the top surface of the oil stain adsorption mechanism 3 and lower than the top end of the overflow plate 2. Rainwater accumulates in the pretreatment chamber. When the rainwater level is higher than the top surface of the oil stain adsorption mechanism 3, the oil separator 5 intercepts the rainwater to prevent untreated rainwater from being directly discharged from the drain outlet 11. The two U-shaped surfaces of the oil separator 5 are respectively fitted to the two wider side walls of the outer casing 1, thus forming a sealed structure with the outer casing 1, preventing rainwater from seeping out through the gap between the oil separator 5 and the inner wall of the outer casing 1, thereby improving the efficiency of oil stain treatment in rainwater. Of course, in other embodiments, the oil separator 5 can also be a straight plate, directly fixedly connected to the side of the oil stain adsorption mechanism 3 near the drain outlet 11, intercepting rainwater higher than the oil stain adsorption mechanism 3 to prevent oil stains in the rainwater from being directly discharged.

[0054] When the rainwater level is higher than the bottom of the overflow plate 2 but lower than the top of the oil separator 5, the rainwater is intercepted on the side of the oil separator 5 near the oil adsorption mechanism 3. When the rainwater level is higher than the top of the oil separator 5, the rainwater is also higher than the top of the overflow plate 2, thus stratifying above the overflow plate 2. Under the action of gravity, the oil in the rainwater is suspended on the top layer of the rainwater and is always intercepted above the overflow plate 2. The oil-free water layer in the rainwater after stratification still flows into the drainage chamber through the pretreatment chamber and drainage channel, and is then discharged through the drain outlet 11.

[0055] The oil-water separator provided in this embodiment, when the road rainwater flow rate is low, guides the rainwater into the pretreatment chamber, where it comprehensively absorbs and settles oil, separating the oil from other liquids and accumulating sediment within the pretreatment chamber. This prevents oil or sediment from clogging drainage pipes or other filtration devices, ensuring smooth rainwater discharge. When the road rainwater flow rate is high, the rainwater level gradually accumulates above the overflow plate 2, transitioning from turbulent to laminar flow within the overflow chamber. The oil in the rainwater is at the top layer, above the bottom of the overflow plate 2, and most of the oil is trapped within the overflow chamber. Although a small portion of oil is discharged directly from the drain outlet 11 through the overflow channel and drainage chamber, the total oil content in the discharged rainwater remains below the discharge standard. The silt in the rainwater continues to accumulate at the bottom of the sewer opening, thereby separating oil and silt from the rainwater while maintaining the drainage rate, preventing blockage of drainage pipes or other filtration devices, and achieving efficient discharge of rainwater.

[0056] The overflow plate 2, water baffle 4, oil separator 5, guide rail 21, slide rail 41, and outer casing 1 can all be made of plastic, ceramic, painted metal, or wood, as long as they possess sufficient hardness and corrosion resistance to meet the requirements for treating oily rainwater. In this embodiment, the overflow plate 2, water baffle 4, oil separator 5, guide rail 21, slide rail 41, and outer casing 1 are all made of plastic, which not only reduces manufacturing costs but also provides high corrosion resistance, extending the service life of the oil-water separator.

[0057] The grille 6 is installed at the top of the outer casing 1 to filter solid pollutants, such as leaves, branches, and plastic bags, from rainwater on the road that are larger than the pores of the grille 6. The shape of the grille 6 matches the opening of the outer casing 1 and can be a square or circular mesh. The grille 6 can be made of metal, wood, or plastic. In this embodiment, the grille 6 is a hollow cuboid made of ductile iron. The top of the grille 6 has a flanged structure, and the outer casing 1 has a groove that matches the flanged structure. The bottom surface of the grille 6 has a mesh structure with 210mm × 25mm slotted holes. The ductile iron grille 6 has high hardness, which can meet the load-bearing requirements of the road. Of course, in other embodiments, the grille 6 can also be made of other materials, and the pores of the grille 6 can be larger or smaller.

[0058] Handles 61 are provided on the inner walls of opposite sides of the grating 6. The top surface of the handles 61 is not higher than the top surface of the outer casing 1. The handles 61 are generally U-shaped. The ductile iron grating 6 is heavy, and when it is installed on the outer casing 1 or the drain outlet, it is difficult to remove the grating 6 directly from the drain outlet. By providing handles 61, it is easy to remove the grating 6 from the outer casing 1 or the drain outlet, thereby facilitating the maintenance or replacement of the oil-water separator. The oil adsorption mechanism 3 needs to be regularly maintained or replaced to ensure that its oil adsorption capacity is always greater than the sewage discharge rate, so as to keep the oil content of the discharged sewage below the discharge standard.

[0059] In practical applications, the outer casing 1 can be set to different specifications according to the diameter of the drainage outlet 11 in the road. The overflow plate 2, oil separator 5, oil adsorption mechanism 3 and water baffle 4 can all be adapted to the specifications of the outer casing 1 to meet the needs of rapid assembly of the oil-water separator, thereby improving the convenience of installation of the oil-water separator and improving the efficiency of installation or disassembly of the oil-water separator.

[0060] The oil-water separator in this embodiment can be used in conjunction with storm drains on urban roads to form a network-based stormwater treatment system. The size and materials of the oil-water separator must meet the installation requirements of the storm drains. On-site installation is convenient and flexible, maintenance is easy, and no additional power is required, thus reducing operating costs. The oil-water separator in this embodiment can trap initial rainwater oil, reducing road runoff pollution. It features overflow, rainwater oil trapping, pollution reduction, good load-bearing capacity, easy installation, long service life, and corrosion resistance.

[0061] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0062] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. An oil-water separator for a road drain inlet, which is installed in the road drain inlet to absorb oil stains in the road rainwater and separate mud and sand from the road rainwater to maintain smooth drainage of road rainwater; the oil-water separator includes an outer casing, which is installed inside the rainwater inlet; a drain outlet is provided on one inner wall of the outer casing; characterized in that, The oil-water separator also includes: An overflow plate is inclined downward and detachably installed inside the outer casing; an overflow channel is provided between the top of the overflow plate and the inner wall of the outer casing on one side containing the drain outlet, and a water inlet channel is provided between the bottom of the overflow plate and the inner wall of the outer casing on the other side. An oil stain adsorption mechanism is detachably installed inside the outer casing; the oil stain adsorption mechanism is located directly below the overflow plate; the oil stain adsorption mechanism includes multiple oil-absorbing plates; the oil-absorbing plates are used to adsorb oil stains in oily rainwater; the multiple oil-absorbing plates are fixedly connected to each other to form a grid structure, so that multiple horizontal and vertical rainwater channels are formed within the oil stain adsorption mechanism; and A baffle plate is detachably connected to the bottom surface of the outer casing; the baffle plate is parallel to the inner wall of the outer casing containing the drain outlet; the bottom end of the baffle plate is in contact with the bottom surface of the outer casing, and the top end of the baffle plate is higher than the bottom surface of the oil stain adsorption mechanism and lower than the top surface of the oil stain adsorption mechanism. The baffle plate and the overflow plate divide the inner cavity of the outer casing into a pretreatment chamber, a drainage chamber, and an overflow chamber; the pretreatment chamber is located below the overflow plate on the side away from the drain outlet; the drainage chamber is located below the overflow plate on the side closer to the drain outlet; the overflow chamber is located above the overflow plate; one end of the overflow chamber is connected to the drainage chamber through an overflow channel, and the other end of the overflow chamber is connected to the pretreatment chamber through a water inlet channel; the pretreatment chamber is connected through the drainage channel between the baffle plate and the overflow plate. The working process of the oil-water separator is as follows: rainwater from the road flows along the overflow plate into the pretreatment chamber, where it is then adsorbed by the oil adsorption mechanism; when the rainwater level is higher than the baffle plate, the rainwater, after oil absorption treatment, flows into the drainage chamber through the drainage channel and is then discharged out of the outer box through the drain outlet; when the rainwater level is higher than the top of the overflow plate, a portion of the rainwater flows into the drainage chamber through the pretreatment chamber and the drainage channel, while another portion flows directly into the drainage chamber through the overflow channel and is then discharged through the drain outlet. The oil-water separator also includes an oil separator plate; the oil separator plate is an inverted U-shaped plate, and the oil separator plate is detachably connected to the side of the oil stain adsorption mechanism near the water baffle plate; the oil separator plate is located directly above the water baffle plate; the top of the oil separator plate is higher than the top surface of the oil stain adsorption mechanism and lower than the top of the overflow plate.

2. The oil-water separator for road storm drains according to claim 1, characterized in that, The distance between the top of the overflow plate and the inner wall of the outer casing containing the drain outlet is not less than 15cm; the distance between the bottom of the overflow plate and the inner wall of the other side of the outer casing is 15~20cm.

3. The oil-water separator for road storm drains according to claim 2, characterized in that, The overflow plate is a 7-shaped plate. One side of the overflow plate is arranged parallel to the side wall of the outer casing containing the drain outlet, so that an overflow channel is formed between the overflow plate and the inner wall of the outer casing. The other side of the overflow plate is inclined downward and does not contact the other side wall of the outer casing, so that a water inlet channel is formed between the overflow plate and the other inner wall of the outer casing.

4. The oil-water separator for road storm drains according to claim 3, characterized in that, The included angle between the two sides of the overflow plate is 60° to 85°; the distance between the top of the overflow plate and the top of the outer casing is 6 to 15 cm.

5. The oil-water separator for road storm drains according to claim 1, characterized in that, The oil-water separator also includes two guide rails; the two guide rails are vertically arranged and fixedly connected to the inner wall of the outer casing; the two guide rails are slidably connected to both sides of the overflow plate.

6. The oil-water separator for road storm drains according to claim 1, characterized in that, The oil-absorbing plate includes a substrate and an oil-absorbing layer; the substrate is a straight plate; the oil-absorbing layer covers the substrate.

7. The oil-water separator for road storm drains according to claim 1, characterized in that, The oil-water separator also includes two slide rails; the two slide rails are vertically arranged and fixedly connected to the inner walls of opposite sides of the outer casing; the baffle plate is slidably connected to the slide rails.

8. The oil-water separator for road storm drains according to claim 1, characterized in that, The oil-water separator also includes a grid; the grid is installed on the top of the outer casing and is used to filter solid pollutants in rainwater with a particle size larger than the grid openings.

9. The oil-water separator for road storm drains according to claim 8, characterized in that, The grille is a hollow cuboid; the top of the grille is provided with a flange structure, and the outer box is provided with a groove that matches the flange structure; the bottom surface of the grille is a mesh structure.

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