An oil-water separation oil separation tank and a separation method thereof

Abstract

This invention provides an oil-water separation tank and its separation method, comprising an oil separator, an oil collection tank, an oil return tank, and a sedimentation tank. The oil collection tank has an oil storage trough with multiple inclined plates at its bottom. The oil return tank has an oil return mechanism, and the sedimentation tank has a feeding device. The tops of the oil return tank and the sedimentation tank are connected. A roller adsorbs oil stains from the surface of the oil return tank, and a scraper scrapes the oil stains into the tank. When the water level rises to the top of the vertical frame, the U-shaped frame and the oil return tank flip, allowing small amounts of grease in the oil return tank to be recovered in the oil collection tank. When wastewater enters the sedimentation tank, the feeding device is activated to allow solid particles in the oil stains to enter the frame, preventing solid particles from being adhered to and trapped by grease, forming a complex grease layer on the pipe wall, which can lead to pipe blockage, poor drainage, and sewage backflow, requiring significant manpower and resources for pipe dredging.

Description

Technical Field

[0001] This invention relates to the field of oil separators, and in particular to an oil separator for oil-water separation and a separation method thereof. Background Technology

[0002] Existing methods for separating oil from water in wells present significant challenges. Simply pumping oil off the surface of the wastewater requires continuous pump operation, which is time-consuming, labor-intensive, and difficult to clean. This approach is only effective for larger, less stable floating oil particles, making it unsuitable for early drainage scenarios primarily involving large oil flakes, resulting in ineffective cleaning. Tiny oil particles still mix with the water and flow into subsequent water pipes, hindering the complete removal of oil from the wastewater.

[0003] Meanwhile, the oil slick contains solid particles, such as residue and metal shavings, causing oil-water separation to fail. Unseparated contaminants enter the pipe network with the water flow. Over time, as the water flow slows and the temperature decreases, tiny grease particles gradually coalesce and solidify, adhering to the inner walls of the pipe network. Solid particles are also trapped and adhered to by the grease, forming a complex scale layer on the pipe walls. This makes the pipe network connecting the grease traps prone to blockage, leading to poor drainage, sewage backflow, or requiring significant manpower and resources for pipe dredging. It also makes it difficult to ensure the stable operation of subsequent treatment systems. Summary of the Invention

[0004] This invention provides an oil-water separation tank and its separation method, which solves the problems of time-consuming and labor-intensive pumping of surface oil, difficult cleaning, only effective for floating oil with large particle size and poor stability, poor cleaning effect, and the presence of small oil particles mixed in the water flowing into subsequent water pipes.

[0005] Another technical problem solved by this invention is that oil sludge contains solid particles, such as residues and metal fragments, which leads to the failure of oil-water separation. The solid particles are adhered to and trapped by grease, forming a composite scale layer of grease on the pipe wall, making the pipeline network connected by the oil separator easily clogged.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: an oil-water separation tank and its separation method, comprising an oil separator, the oil separator including an oil collection tank, an oil return tank and a sedimentation tank, the oil collection tank being provided with an oil storage tank, the bottom of the oil storage tank being provided with multiple inclined plates, the oil return tank being provided with an oil return mechanism, the sedimentation tank being provided with a feeding device, and the tops of the oil return tank and the sedimentation tank being connected.

[0007] In the preferred embodiment, a partition wall is provided between the oil collection tank and the oil return tank, and a through groove is provided at the top of the partition wall. A second partition wall is provided between the oil return tank and the sedimentation tank. An inlet is provided at the top of the oil collection tank, and an outlet is provided at the bottom of the sedimentation tank.

[0008] In the preferred embodiment, multiple second valves are provided at the bottom of the partition wall, multiple first valves are provided at the bottom of the second partition wall, and low-position sensors and high-position sensors are provided on the second partition wall.

[0009] In the preferred embodiment, the sedimentation tank has a frame trough at the bottom, a frame body on the frame trough, and a winch at the top of the sedimentation tank, which is connected to the frame body.

[0010] In the preferred embodiment, the oil storage tank includes an inclined bottom plate, one end of which is provided with a hook plate, and the area between the hook plate and the partition wall is an oil inlet. Multiple second valves are located at the bottom of the inclined plate.

[0011] In a preferred embodiment, the oil return mechanism includes a vertical frame, a lifting U-shaped frame on the vertical frame, an oil return tank installed on the U-shaped frame, and a drive mechanism on the oil return tank.

[0012] In the preferred embodiment, the vertical frame includes a vertical plate with a vertical groove. The top of the vertical groove is inclined. The vertical frame is provided with a guide bar with a guide groove. The vertical plate is provided with multiple connecting plates, which are connected to the second partition wall.

[0013] In the preferred embodiment, the return oil tank includes a tank body with two barrels on the tank body, a scraper on one side of the barrels, floats on both sides of the tank body, and an inclined plate on one side of the tank body.

[0014] In the preferred embodiment, the housing is equipped with a pump body, which is connected to two floats. A positioning mechanism is provided on the partition wall. The positioning mechanism includes a first positioning gauge and a second positioning gauge. The first positioning gauge is equipped with a first float, and the second positioning gauge is equipped with a second float.

[0015] In the preferred embodiment, the density of the first float is less than the density of oil, and the density of the second float is greater than the density of oil but less than the density of water.

[0016] In a preferred embodiment, the U-shaped frame includes a rotating shaft, side frames on both sides of the rotating shaft, a horizontal groove on the side frames, a sliding column at one end of the rotating shaft that abuts against the vertical groove, and a guide shaft on the rotating shaft. When the return oil tank floats to the top, the guide shaft abuts against the guide groove of the guide bar.

[0017] In a preferred embodiment, the drive mechanism includes a first motor and two rollers. The rollers have a driven bevel gear on their shafts, and the first motor has a main bevel gear at one end. The main bevel gear meshes with the driven bevel gear, and the rollers are rotatably connected to the barrel.

[0018] In a preferred embodiment, the feeding device includes a lifting device and two material boxes. The lifting device is equipped with a lifting plate, and the lifting plate is equipped with a rotating main gear. The bottom of the material box is equipped with a discharge pipe, and the bottom of the discharge pipe is equipped with a rotatably connected driven gear.

[0019] In the preferred embodiment, the bottom of the feeding tube is provided with an arc-shaped feeding port, the driven gear is provided with an arc-shaped plate, the driven gear meshes with the main gear, and the two feeding tubes are at different heights.

[0020] In a preferred embodiment, the lifting device includes a support frame, two sliders are provided at one end of the lifting plate, the sliders are slidably connected to the support frame, and a second motor is provided on the lifting plate, which is connected to the main gear.

[0021] In the preferred embodiment, the bracket is equipped with a third motor and a guide rod. The third motor is equipped with a lead screw, which is threadedly connected to the lifting plate. The guide rod passes through the lifting plate and is slidably connected to it.

[0022] In the preferred embodiment, a material box is provided at the top of the oil return tank, and a discharge valve is provided at the bottom of the material box.

[0023] A method for separating oil and water in an oil separator: S1, Discharge liquid into the inlet, open the second valve, close the first valve, and the oil in the oil collection tank enters the oil storage tank due to buoyancy; S2. When the low-position sensor responds, the material box is opened to allow the demulsifier in the material box to enter the oil return pool, and the drive mechanism of the oil return mechanism is driven so that the roller of the oil return mechanism can recover the oil sludge that escapes into the oil return pool. S3. When the oil return tank of the oil return mechanism reaches the top position of the vertical frame, the oil return tank is tilted and poured into the oil collection tank. S4. When the high-level sensor in the oil return tank responds, the second valve is closed and the first valve is opened to allow sewage to enter the sedimentation tank. When the low-level sensor responds, the first valve is closed, the oil return tank returns to the low level, and the second valve is opened at the same time. S5. Drive the feeding device to feed coagulant and flocculant so that the residue and metal scrap form large flocs and settle into the frame. S6. Repeat S2 to S5 to recover the oil sludge in the oil return tank to the oil collection tank, and settle the residue and metal debris in the sedimentation tank. S7. Regularly lift and clean the impurities in the frame.

[0024] The beneficial effects of this invention are as follows: the inlet is located at the top of the sedimentation tank, and the sewage first enters the oil collection tank through one side of the oil storage tank, which facilitates stable oil-water separation of the sewage. The sewage is separated into oil and water in the oil collection tank. Large oil sludge and floating oil with large particle size and poor stability have low density. As the liquid level is high, the inclined bottom plate and hook plate of the inclined structure can store the oil in the oil storage tank.

[0025] When wastewater containing tiny grease particles and solid particles enters the oil return tank, the rollers absorb the oil on the surface of the oil return tank, and the scrapers scrape the oil into the tank. When the water level rises to the top of the vertical frame, the U-shaped frame and the oil return tank flip over so that the tiny grease particles in the oil return tank can be recovered in the oil collection tank.

[0026] When the liquid level reaches the high-level sensor, the oil collection tank and the return oil tank are disconnected, while the return oil tank and the sedimentation tank are connected. The return oil tank flips to a horizontal state, and the return oil mechanism can automatically adjust the lifting and tilting according to the rise and fall of the water level to perform secondary oil removal treatment on the sewage in the return oil tank. This saves energy, has a high degree of automation, and solves the problems of existing systems that require continuous operation of pumps, resulting in low cleaning efficiency, incomplete oil collection, and high maintenance costs. It also solves the problem of tiny oil particles mixed in the water flowing into subsequent water pipes, making it difficult to completely remove oil from the sewage.

[0027] When wastewater enters the sedimentation tank, the feeding device drives the coagulant and flocculant in the two feed tanks to enter the sedimentation tank. This allows solid particles in the oil, such as residues and metal fragments, to enter the sedimentation tank, preventing solid particles from being adhered to and trapped by grease, forming a complex scale layer of grease on the pipe wall, which would lead to pipe blockage, poor drainage, and backflow of wastewater into the pipe network, requiring a lot of manpower and resources to dredge the pipes. Attached Figure Description

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is an isometric view of the oil return mechanism of the present invention; Figure 3 This is a side view of the oil return mechanism of the present invention; Figure 4 This is the present invention. Figure 1 A magnified view of A in the middle; Figure 5 This is an axonometric view of the return oil tank of the present invention; Figure 6 This is an axonometric view of the U-shaped frame of the present invention; Figure 7 This is an axonometric view of the vertical frame of the present invention; Figure 8 This is a schematic diagram of the drive mechanism of the present invention; Figure 9 This is a schematic diagram of the positioning mechanism of the present invention. Figure 10 This is a front view of the feeding device of the present invention; Figure 11 This is a front view of the lifting device of the present invention; Figure 12 This is a side view of the lifting device of the present invention; Figure 13 This is a top view of the invention from the perspective of a gear; In the diagram: 1. Oil separator; 101. Oil collection tank; 102. Oil return tank; 103. Sedimentation tank; 104. Partition wall; 1041. Second partition wall; 105. Inlet; 106. Outlet; 107. Frame trough; 108. Oil storage tank; 2. Hook plate; 201. Inclined bottom plate; 202. Inclined plate; 3. Oil return mechanism; 4. Vertical frame; 5. Vertical plate; 501. Vertical trough; 502. Guide bar; 503. Connecting plate; 504. Oil return tank; 6. Tank body; 601. Barrel box; 602. Scraper; 603. Float; 604. Pump body; 605. Inclined plate; 606. Drive mechanism; 7. First motor; 701. Main bevel gear; 702. Roller; 703. Driven bevel gear; 704. U-shaped frame; 8. Rotating shaft; 801. Side frame 802; transverse groove 803; guide shaft 804; sliding column 805; feeding device 9; lifting device 901; bracket 9011; slider 9012; lifting plate 9013; main gear 9014; second motor 9015; third motor 9016; lead screw 9017; guide rod 9018; discharge pipe 902; driven gear 903; arc plate 9031; material box 904; low position sensor 10; high position sensor 11; first valve 12; material box 13; frame 14; measuring mechanism 15; first position gauge 1501; second position gauge 1502; first float 1503; second float 1504; second valve 16. Detailed Implementation

[0029] Example 1: like Figure 1-13 The present invention discloses an oil-water separation tank and its separation method, comprising an oil separator 1, which includes an oil collection tank 101, an oil return tank 102, and a sedimentation tank 103. An oil storage tank 2 is provided on the oil collection tank 101, and multiple inclined plates 3 are provided at the bottom of the oil storage tank 2. An oil return mechanism 4 is provided on the oil return tank 102, and a feeding device 9 is provided on the sedimentation tank 103. The tops of the oil return tank 102 and the sedimentation tank 103 are connected. In this structure, the inlet 106 is located at the top of the sedimentation tank 103. Wastewater first enters the oil collection tank 101 through one side of the oil storage tank 2. The impacting wastewater slows down the flow rate of the wastewater, facilitating stable oil-water separation. Large oil sludge and floating oil with large particle size and poor stability, due to their lower density, are stored in the oil storage tank 2 as the liquid level rises. The inclined bottom plate 202 and hook plate 201 of the inclined structure allow the oil to be stored in the oil storage tank 2.

[0030] Multiple inclined plates 3 are tilted downwards to increase the path of sewage from the oil collection tank 101 to the return oil tank 102, so that the oil in the sewage can have a longer separation time and increase the efficiency of oil-water separation.

[0031] When wastewater containing small amounts of grease and solid particles enters the oil return tank 102, the demulsifier in the feed hopper 13 enters the oil return tank 102, and the wastewater level in the oil return tank 102 slowly rises. The oil return tank 6 slowly rises under the action of the float 604, driving the drive mechanism 7 of the oil return mechanism 4 so that the roller 703 adsorbs the oil on the surface of the oil return tank 102. The scraper 603 scrapes the oil into the tank body 601. When the water level rises to the top of the vertical frame 5, the guide shaft 804 of the U-shaped frame 8 abuts against the guide bar 503, so that the U-shaped frame 8 and the oil return tank 6 flip over, so that the oil in the oil return tank 6 is poured into the oil collection tank 101 through the inclined plate 606, so that the small amounts of grease in the oil return tank 102 can be recovered in the oil collection tank 101.

[0032] When the liquid level reaches the high-level sensor 11, the oil collection tank 101 and the return oil tank 102 are disconnected, and the return oil tank 102 and the sedimentation tank 103 are connected, so that the sewage flows into the sedimentation tank 103. The liquid level in the return oil tank 102 drops, so that the return oil tank 6 slowly descends, so that the return oil tank 6 flips to a horizontal state. The return oil mechanism 4 can automatically adjust the lifting and tilting according to the rise and fall of the water level, so as to perform secondary oil removal treatment on the sewage in the return oil tank 102. It saves energy, has a high degree of automation, and solves the problems of the existing system that requires the pump to work continuously, resulting in low cleaning efficiency, incomplete oil collection, and high operation and maintenance costs. At the same time, it solves the problem that tiny oil particles mixed in the water flow into the subsequent water pipes, making it difficult to completely remove the oil from the sewage.

[0033] When wastewater enters the sedimentation tank 103, the feeding device 9 drives the coagulant and flocculant in the two feed tanks 904 to enter the sedimentation tank 103. This allows solid particles in the oil sludge, such as residue and metal fragments, to enter the frame 14, preventing solid particles from being adhered to and trapped by grease, forming a complex scale layer on the pipe wall, which would lead to pipe blockage, poor drainage, and sewage backflow, requiring significant manpower and resources for pipe dredging. After the solid particles in the sedimentation tank 103 have been removed, the water is discharged through the outlet 107, enabling the entire device to achieve multi-chamber sewage treatment.

[0034] In a preferred embodiment, a partition wall 104 is provided between the oil collection tank 101 and the return oil tank 102, and a through groove 1041 is provided at the top of the partition wall 104. A second partition wall 105 is provided between the return oil tank 102 and the sedimentation tank 103. An inlet 106 is provided at the top of the oil collection tank 101, and an outlet 107 is provided at the bottom of the sedimentation tank 103. With this structure, the oil storage tank 2 is located in the middle of the oil collection tank 101. Wastewater enters from the outlet 107, impacts one side of the oil storage tank 2, slows down the wastewater flow rate, and simultaneously allows the wastewater to flow from one side of the oil storage tank 2 onto the inclined plate 3.

[0035] In a preferred embodiment, the bottom of partition wall 104 is provided with multiple second valves 16, the bottom of second partition wall 105 is provided with multiple first valves 12, and low-level sensor 10 and high-level sensor 11 are provided on second partition wall 105. With this structure, oil collection tank 101 and oil return tank 102 are connected through multiple second valves 16.

[0036] In a preferred embodiment, the sedimentation tank 103 has a frame groove 108 at its bottom, a frame body 14 on the frame groove 108, and a winch at the top of the sedimentation tank 103 connected to the frame body 14. With this structure, when there are many impurities in the frame body 14, the winch is driven to raise the frame body 14, allowing for periodic lifting and cleaning of the impurities within the frame body 14.

[0037] In a preferred embodiment, the oil storage tank 2 includes an inclined bottom plate 202, with a hook plate 201 at one end. The hook plate 201 and the partition wall 104 form an oil inlet, and multiple second valves 16 are located at the bottom of the inclined plate 3. With this structure, the multiple inclined plates 3 tilt downwards to increase the path of wastewater flowing from the oil collection tank 101 to the return oil tank 102, allowing for a longer separation time for the oil in the wastewater and increasing the efficiency of oil-water separation.

[0038] In a preferred embodiment, the oil return mechanism 4 includes a vertical frame 5, on which a lifting U-shaped frame 8 is mounted, and an oil return tank 6 is installed on the U-shaped frame 8. A drive mechanism 7 is also provided on the oil return tank 6. With this structure, the oil return tank 6 is mounted on the U-shaped frame 8.

[0039] In the preferred embodiment, the vertical frame 5 includes a vertical plate 501 with a vertical groove 502. The top of the vertical groove 502 is inclined. The vertical frame 5 is equipped with a guide bar 503 with a guide groove. The vertical plate 501 is equipped with multiple connecting plates 504, which are connected to the second partition wall 105. With this structure, when wastewater containing small grease and solid particles enters the oil return tank 102, the demulsifier in the feed box 13 enters the oil return tank 102, and the wastewater level in the oil return tank 102 slowly rises. The oil return tank 6 slowly rises under the action of the float 604. When the water level rises to the top of the vertical frame 5, the guide shaft 804 of the U-shaped frame 8 abuts against the guide bar 503, causing the U-shaped frame 8 and the oil return tank 6 to flip over, so that the oil in the oil return tank 6 is poured into the oil collection tank 101 through the inclined plate 606, so that the small grease in the oil return tank 102 can be recovered in the oil collection tank 101.

[0040] In a preferred embodiment, the return oil tank 6 includes a tank body 601, on which two tanks 602 are mounted. A scraper 603 is provided on one side of each tank 602, floats 604 are provided on both sides of the tank body 601, and an inclined plate 606 is provided on one side of the tank body 601. With this structure, when the water level rises to the top of the vertical frame 5, the guide shaft 804 of the U-shaped frame 8 abuts against the guide bar 503, causing the U-shaped frame 8 and the return oil tank 6 to flip over, so that the oil sludge in the return oil tank 6 is poured into the oil collection tank 101 through the inclined plate 606, and the oil sludge is poured into the oil collection tank 101 through the through channel 1041.

[0041] In a preferred embodiment, the U-shaped frame 8 includes a rotating shaft 801, side frames 802 are provided on both sides of the rotating shaft 801, a horizontal groove 803 is provided on the side frames 802, a sliding column 805 is provided at one end of the rotating shaft 801, the sliding column 805 abuts against the vertical groove 502, and a guide shaft 804 is provided on the rotating shaft 801. When the return oil tank 6 floats to the top, the guide shaft 804 abuts against the guide groove of the guide bar 503. Due to this structure, the floats 604 on both sides pass through the transverse groove 803. Multiple side shafts are provided on both sides of the tank body 601, abutting against the transverse groove 803 to allow the return oil tank 6 to be mounted on the U-shaped frame 8. The sliding column 805 slides against the vertical groove 502.

[0042] In a preferred embodiment, the drive mechanism 7 includes a first motor 701 and two rollers 703. A driven bevel gear 704 is mounted on the shaft of each roller 703, and a main bevel gear 702 is mounted at one end of the first motor 701. The main bevel gear 702 meshes with the driven bevel gear 704. The rollers 703 are rotatably connected to the container 602. With this structure, the first motor 701 is driven, causing the main bevel gear 702 to rotate, which in turn causes the two driven bevel gears 704 to rotate, thus rotating the two rollers 703. The rollers 703 absorb grease, and a scraper 603 abuts against them to remove the grease, allowing it to enter the container 601.

[0043] In a preferred embodiment, the feeding device 9 includes a lifting device 901 and two material bins 904. The lifting device 901 is equipped with a lifting plate 9013, and the lifting plate 9013 is equipped with a rotating main gear 9014. The bottom of the material bins 904 is equipped with a discharge pipe 902, and the bottom of the discharge pipe 902 is equipped with a rotatably connected driven gear 903. With this structure, the feeding device 9 can control the discharge of materials from the two material bins 904.

[0044] In a preferred embodiment, the bottom of the feeding pipe 902 has an arc-shaped feeding port, and the driven gear 903 has an arc-shaped plate 9031. The driven gear 903 meshes with the main gear 9014, and the two feeding pipes 902 have different heights. This structure drives the third motor 9016 to rotate the lead screw 9017, thereby adjusting the position of the lifting plate 9013 and the position of the main gear 9014, allowing the main gear 9014 to mesh with the driven gears 903 at different heights. The second motor 9015 drives the main gear 9014 to rotate, which in turn rotates the driven gear 903. When the arc-shaped plate 9031 on the gear 903 covers the arc-shaped discharge port at the bottom of the discharge pipe 902, the discharge pipe 902 closes, thereby closing the material box 904. When the arc-shaped plate 9031 on the gear 903 moves away from the arc-shaped discharge port at the bottom of the discharge pipe 902, the discharge pipe 902 opens, thereby opening the material box 904.

[0045] In a preferred embodiment, the lifting device 901 includes a bracket 9011, and a lifting plate 9013 has two sliders 9012 at one end. The sliders 9012 are slidably connected to the bracket 9011. A second motor 9015 is provided on the lifting plate 9013, and the second motor 9015 is connected to the main gear 9014.

[0046] In the preferred embodiment, the bracket 9011 is provided with a third motor 9016 and a guide rod 9018. The third motor 9016 is provided with a lead screw 9017, which is threadedly connected to the lifting plate 9013. The guide rod 9018 passes through the lifting plate 9013 and is slidably connected to the lifting plate 9013.

[0047] In a preferred embodiment, a material box 13 is provided at the top of the oil return tank 102, and a discharge valve is provided at the bottom of the material box 13. This structure drives the discharge valve at the bottom of the material box 13 to allow material to be fed into the material box 13.

[0048] Example 2; Further explanation in conjunction with Example 1: In a preferred embodiment, a pump body 605 is mounted on the housing 601, and the pump body 605 is connected to two floats 604. A positioning mechanism 15 is mounted on the partition wall 104, and the positioning mechanism 15 includes a first position gauge 1501 and a second position gauge 1502. The first position gauge 1501 is equipped with a first float ball 1503, and the second position gauge 1502 is equipped with a second float ball 1504. With this structure, the pump body 605 is a dual-purpose air pump for pumping and releasing. The first position gauge 1501 and the second position gauge 1502 measure the liquid level difference between oil and water. When the liquid level difference is large and the oil layer is thick, the pump body 605 is driven to release air from the floats 604, thereby lowering the liquid level in the drum 703. When the liquid level difference is small and the oil layer is thin, the pump body 605 is driven to inflate the floats 604, thereby adjusting the position of the drum 703 so that the floats 604 can clean oil of different thicknesses.

[0049] In the preferred embodiment, the density of the first float 1503 is less than the density of oil, and the density of the second float 1504 is greater than the density of oil but less than the density of water.

[0050] Example 3; Further explanation based on Examples 1-2: A separation method for an oil-water separator, S1: Discharge liquid into inlet 106, open second valve 16, close first valve 12, and the oil sludge in oil collection tank 101 enters oil storage tank 2 due to buoyancy; S2. When the low position sensor 10 responds, the material box 13 is opened so that the demulsifier in the material box 13 enters the oil return tank 102, and the drive mechanism 7 of the oil return mechanism 4 is driven so that the roller 703 of the oil return mechanism 4 can recycle the oil sludge that escapes into the oil return tank 102. S3. When the oil return tank 6 of the oil return mechanism 4 reaches the top position of the vertical frame 5, the oil return tank 6 tilts and pours the recovered oil into the oil collection tank 101. S4. When the high-level sensor 11 in the oil return tank 102 responds, the second valve 16 is closed and the first valve 12 is opened to allow sewage to enter the sedimentation tank 103. When the low-level sensor 10 responds, the first valve 12 is closed, the oil return tank 6 returns to the low level, and the second valve 16 is opened at the same time. S5. Drive the feeding device 9 to feed coagulant and flocculant, so that the residue and metal scrap form large flocs and settle into the frame 14. S6. Repeat S2 to S5 to recover the oil in the oil return tank 102 to the oil collection tank 101, and settle the residue and metal debris in the sedimentation tank 103. S7. Periodically lift and clean the impurities in the frame 14.

[0051] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. An oil-water separator, characterized in that: It includes an oil separator (1), which includes an oil collection tank (101), an oil return tank (102), and a sedimentation tank (103). The oil collection tank (101) is equipped with an oil storage tank (2), and the bottom of the oil storage tank (2) is equipped with multiple inclined plates (3). The oil return tank (102) is equipped with an oil return mechanism (4), and the sedimentation tank (103) is equipped with a feeding device (9). The tops of the oil return tank (102) and the sedimentation tank (103) are connected.

2. The oil-water separator according to claim 1, characterized in that: A partition wall (104) is provided between the oil collection tank (101) and the return oil tank (102). A through groove (1041) is provided at the top of the partition wall (104). A second partition wall (105) is provided between the return oil tank (102) and the sedimentation tank (103). A water inlet (106) is provided at the top of the oil collection tank (101), and a water outlet (107) is provided at the bottom of the sedimentation tank (103).

3. The oil-water separator according to claim 2, characterized in that: The bottom of the partition wall (104) is provided with multiple second valves (16), the bottom of the second partition wall (105) is provided with multiple first valves (12), and the second partition wall (105) is provided with a low-position sensor (10) and a high-position sensor (11).

4. The oil-water separator according to claim 1, characterized in that: The sedimentation tank (103) has a frame groove (108) at the bottom, a frame body (14) on the frame groove (108), and a winch at the top of the sedimentation tank (103). The winch is connected to the frame body (14).

5. The oil-water separator according to claim 1, characterized in that: The oil storage tank (2) includes an inclined bottom plate (202), one end of which is provided with a hook plate (201). The hook plate (201) and the partition wall (104) are the oil inlet, and multiple second valves (16) are located at the bottom of the inclined plate (3).

6. The oil-water separator according to claim 1, characterized in that: The oil return mechanism (4) includes a vertical frame (5), a lifting U-shaped frame (8) is provided on the vertical frame (5), an oil return tank (6) is installed on the U-shaped frame (8), and a drive mechanism (7) is provided on the oil return tank (6).

7. The oil-water separator according to claim 4, characterized in that: The vertical frame (5) includes a vertical plate (501), a vertical groove (502) on the vertical plate (501), the top of the vertical groove (502) is inclined, a guide bar (503) is provided on the vertical frame (5), a guide groove is provided on the guide bar (503), and multiple connecting plates (504) are provided on the vertical plate (501), and the connecting plates (504) are connected to the second partition wall (105).

8. The oil-water separator according to claim 4, characterized in that: The return tank (6) includes a tank body (601), two barrel boxes (602) are provided on the tank body (601), a scraper (603) is provided on one side of the barrel box (602), floats (604) are provided on both sides of the tank body (601), and an inclined plate (606) is provided on one side of the tank body (601).

9. The oil-water separator according to claim 8, characterized in that: The housing (601) is equipped with a pump body (605), which is connected to two floats (604). The partition wall (104) is equipped with a positioning mechanism (15), which includes a first positioning gauge (1501) and a second positioning gauge (1502). The first positioning gauge (1501) is equipped with a first float (1503), and the second positioning gauge (1502) is equipped with a second float (1504).

10. The oil-water separator according to claim 9, characterized in that: The density of the first float (1503) is less than that of oil, and the density of the second float (1504) is greater than that of oil but less than that of water.

11. The oil-water separator according to claim 4, characterized in that: The U-shaped frame (8) includes a pivot (801), side frames (802) on both sides of the pivot (801), a horizontal groove (803) on the side frame (802), a sliding column (805) at one end of the pivot (801), the sliding column (805) abutting against the vertical groove (502), and a guide shaft (804) on the pivot (801). When the return oil tank (6) floats to the top, the guide shaft (804) abuts against the guide groove of the guide bar (503).

12. The oil-water separator according to claim 4, characterized in that: The drive mechanism (7) includes a first motor (701) and two rollers (703). The rollers (703) have a driven bevel gear (704) on their shafts. The first motor (701) has a main bevel gear (702) at one end. The main bevel gear (702) meshes with the driven bevel gear (704). The rollers (703) are rotatably connected to the barrel (602).

13. The oil-water separator according to claim 1, characterized in that: The feeding device (9) includes a lifting device (901) and two material boxes (904). The lifting device (901) is equipped with a lifting plate (9013) for lifting, and a rotating main gear (9014) is provided on the lifting plate (9013). The bottom of the material box (904) is equipped with a discharge pipe (902), and the bottom of the discharge pipe (902) is equipped with a rotatingly connected slave gear (903).

14. The oil-water separator according to claim 13, characterized in that: The bottom of the feed tube (902) is provided with an arc-shaped feed port, and the gear (903) is provided with an arc-shaped plate (9031). The gear (903) meshes with the main gear (9014), and the two feed tubes (902) are at different heights.

15. An oil-water separator according to claim 13, characterized in that: The lifting device (901) includes a bracket (9011), and two sliders (9012) are provided at one end of the lifting plate (9013). The sliders (9012) are slidably connected to the bracket (9011). A second motor (9015) is provided on the lifting plate (9013), and the second motor (9015) is connected to the main gear (9014).

16. The oil-water separator according to claim 15, characterized in that: The bracket (9011) is equipped with a third motor (9016) and a guide rod (9018). The third motor (9016) is equipped with a lead screw (9017). The lead screw (9017) is threadedly connected to the lifting plate (9013). The guide rod (9018) passes through the lifting plate (9013) and is slidably connected to the lifting plate (9013).

17. The oil-water separator according to claim 1, characterized in that: The top of the oil return tank (102) is equipped with a material box (13), and the bottom of the material box (13) is equipped with a discharge valve.

18. A separation method for an oil-water separator according to any one of claims 1 to 17, characterized in that: S1. Discharge liquid into the inlet (106), open the second valve (16), close the first valve (12), and the oil in the oil collection tank (101) enters the oil storage tank (2) due to buoyancy; S2. When the low position sensor (10) responds, the material box (13) is opened so that the demulsifier in the material box (13) enters the oil return pool (102) and drives the drive mechanism (7) of the oil return mechanism (4) so ​​that the roller (703) of the oil return mechanism (4) can recycle the oil sludge that escapes into the oil return pool (102). S3. When the oil return tank (6) of the oil return mechanism (4) reaches the top position of the vertical frame (5), the oil return tank (6) is tilted and dumped into the oil collection tank (101). S4. When the high-level sensor (11) in the oil return tank (102) responds, the second valve (16) is closed and the first valve (12) is opened so that the sewage enters the sedimentation tank (103). When the low-level sensor (10) responds, the first valve (12) is closed, the oil return tank (6) returns to the low position, and the second valve (16) is opened at the same time. S5. Drive the feeding device (9) to feed coagulant and flocculant so that the residue and metal scrap form large flocs and settle into the frame (14); S6. Repeat S2 to S5 to recover the oil in the oil return tank (102) into the oil collection tank (101) and settle the residue and metal debris in the sedimentation tank (103). S7. Periodically lift and clean the impurities in the frame (14).

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