Efficient separator for oily water

Abstract

The invention discloses an efficient separator for oily water. A stacked disc separation unit is arranged in a separator cylinder; a spiral separation unit is arranged on the periphery of the stacked disc separation unit, and the upper portion of the stacked disc separation unit communicates with the upper space of the spiral separation unit. An oily water circulation cavity is formed in the lower part of the separator barrel, leads to the spiral separation unit and is communicated with an oily water input pipe; a dirty oil cavity is formed in the upper part of the separator barrel and is communicated with a dirty oil discharge pipe. The spiral separation unit comprises a spiral separator variable-diameter barrel, and a variable-diameter spiral blade is fixedly installed in the spiral separator variable-diameter barrel. The stacked disc separation unit comprises a stacked disc separator variable-diameter barrel, a top cover plate is fixedly installed at the upper opening end of the stacked disc separator variable-diameter barrel, and a plurality of separation discs which are stacked at intervals are fixedly installed on the lower portion of the top cover plate. The separator can promote aggregation and enlargement of oil droplets in oily water, and has the characteristic of good separation effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, especially to an oil-water separation device for oily sewage. BACKGROUND

[0002] Oily sewage has a wide source, not only in the oil industry, mechanical processing and other industrial production process will produce oil sewage, but also in the shipping, food processing and catering industry will produce oily sewage. Oily sewage composition is complex, harmful, large processing capacity, high difficulty, without treatment, arbitrary discharge, to the soil, aquatic organisms, human health and plants will cause great harm.

[0003] Oil sewage separation treatment method mainly has gravity separation method, electrolysis method and membrane treatment method and other ways. Among them, gravity separation method is the most common oil sewage separation treatment method, gravity separation treatment device mostly adopts the structure type of multilayer horizontal partition plate spacing stacked structure, the oil sewage horizontal parallel flow channel formed between the spaced stacked plates effectively reduces the floating distance of oil droplets, promotes the aggregation of small and dispersed oil droplets and synthesis of large oil droplets, accelerates the floating speed, and is beneficial to improve the oil-water separation treatment efficiency. But in the existing oil-water separation device, the water flow line and water section in the oil-water flow channel are always constant, the flow direction and flow speed of small and dispersed oil droplets remain unchanged during the flow process, so the probability of collision and aggregation of oil droplets is not high; at the same time, this flat plate structure also makes it difficult to achieve the ideal specific surface area in the limited separation device space, and the size of the specific surface area is directly related to the aggregation, growth and floating of oil droplets. Therefore, the existing flat plate stacked structure affects the oil-water separation treatment effect, restricts the oil-water separation treatment effect, and it is difficult to realize the efficient aggregation and separation of oil droplets. SUMMARY

[0004] The technical problem to be solved by the present application is to provide an efficient oil-water separator for oily sewage, which can effectively promote the aggregation and growth of oil droplets in oily sewage and improve the oil-water separation effect.

[0005] In order to solve the above technical problems, the efficient oil-water separator for oily sewage comprises a separator cylinder, a stacked disc separation unit is arranged in the separator cylinder, and a separation water discharge pipe is communicated with the lower part of the stacked disc separation unit; at least two spiral separation units are arranged on the outer periphery of the stacked disc separation unit, and the upper part of the stacked disc separation unit is in space communication with the upper part of the spiral separation unit; an oily sewage circulating cavity is arranged at the lower part of the separator cylinder, the oily sewage circulating cavity is communicated with the spiral separation unit, and the oily sewage circulating cavity is communicated with an oily sewage input pipe; an oil pollution cavity is arranged at the upper part of the separator cylinder, and the oil pollution cavity is communicated with an oil pollution discharge pipe.

[0006] Further, the spiral separation unit comprises a spiral separator variable-diameter cylinder, a variable-diameter spiral blade is fixedly installed in the spiral separator variable-diameter cylinder, and the blade outer end of the variable-diameter spiral blade is spaced apart from the inner wall surface of the spiral separator variable-diameter cylinder; the lower end of the spiral flow channel of the variable-diameter spiral blade is connected to the oil and sludge water circulating cavity through an oil and sludge water rising through hole, and the upper space of the variable-diameter spiral blade is communicated with a spiral drainage pipe.

[0007] Further, the spiral separator variable-diameter cylinder is fixedly installed in the separator cylinder, a spiral separation cavity top plate is fixedly installed above the spiral separator variable-diameter cylinder, a spiral separation cavity bottom plate is fixedly installed below the spiral separator variable-diameter cylinder, the upper and lower ends of the spiral blade core shaft are fixedly connected with the spiral separation cavity top plate and the spiral separation cavity bottom plate respectively, and the variable-diameter spiral blade is fixedly sleeved on the spiral blade core shaft.

[0008] Further, the spiral drainage pipe is communicated with the space below the spiral separation cavity top plate; the spiral separation cavity bottom plate is the top plate of the oil and sludge water circulating cavity, and the oil and sludge water rising through hole is located on the spiral separation cavity bottom plate.

[0009] Further, the spiral separator variable-diameter cylinder sequentially comprises a converging cone section, a waist section and a diverging cone section, the converging cone section and the diverging cone section are respectively located at the upper and lower ends of the waist section; the variable-diameter spiral blade sequentially comprises a lower cone section, an isosceles section and an upper cone section, and the lower cone section, the isosceles section and the upper cone section of the variable-diameter spiral blade are respectively equally spaced corresponding to the converging cone section, the waist section and the diverging cone section of the spiral separator variable-diameter cylinder.

[0010] Further, the stacked disc separation unit comprises a stacked disc separator variable-diameter cylinder, a top cover plate is fixedly installed at the upper end of the stacked disc separator variable-diameter cylinder, a plurality of mutually spaced stacked separation discs are fixedly installed at the lower part of the top cover plate, the central holes of the mutually spaced stacked separation discs constitute a sewage flow guide channel, and a flow guide blind plate is arranged at the bottom end of the sewage flow guide channel.

[0011] Further, the spiral drainage pipe is connected to the upper end of the sewage flow guide channel, the sewage flow guide channel is sequentially connected to the separation disc spacing channel and the backflow channel between the separation disc and the stacked disc separator variable-diameter cylinder, and the separation water discharge pipe.

[0012] Further, the stacked disc separator variable-diameter cylinder sequentially comprises a stacked disc cylinder upper cone section, a stacked disc cylinder isosceles section and a stacked disc cylinder lower cone section, the outer disc periphery of the separation disc is arranged at an equal distance from the inner cylinder surface wall of the stacked disc separator variable-diameter cylinder, and the outer disc periphery of the plurality of separation discs forms the backflow channel with the inner cylinder surface of the stacked disc separator variable-diameter cylinder.

[0013] Furthermore, a sludge riser pipe is installed on the top cover plate, with the upper end of the sludge riser pipe extending into the sludge chamber; a separation plate spacer is placed between adjacent separation plates, and the separation plate connecting bolts pass through the flow guide blind plate, the separation plate spacer, and the separation plates and are fixedly installed on the top cover plate.

[0014] Furthermore, the outer periphery of the stacked disc separation unit is provided with 2 to 6 spiral separation units.

[0015] In the above structure, due to the use of a spiral separation unit, the set of variable-diameter spiral blades and variable-diameter cylinder constitute the first oil-water separation structure. The contraction, compression and expansion of oily wastewater through the variable-diameter spiral channel promotes the continuous collision and combination of tiny oil droplets in the oily wastewater, causing the dispersed oil droplets to grow larger and float to the surface and separate from the wastewater. At the same time, the gap flow channel created by the spaced arrangement of the outer end of the variable-diameter spiral blades and the inner wall of the variable-diameter cylinder forces the oily wastewater to continuously change its flow speed and flow direction. Combined with the continuous compression and expansion of the oily wastewater by the variable-diameter cylinder, the probability of tiny oil droplets colliding and combining is greatly increased, causing small and dispersed oil droplets to aggregate and merge into large oil droplets. The increase in the diameter of the oil droplets greatly accelerates the floating speed, thus greatly enhancing the oil-water separation effect. The multiple adjacent spiral blades of the variable diameter spiral blade actually form a stacked structure. According to the shallow pool theory, its settling velocity is related to the sedimentation area. The shallower the sedimentation separation pool, the smaller the suspended particles that can be removed, and the separation capacity can be increased several times. This structure can greatly improve the separation capacity of the equipment and reduce the space occupied by the separation equipment. It is especially suitable for use in space-constrained applications such as ships.

[0016] Furthermore, because this invention employs a stacked disc separation unit structure, the central holes of several stacked separation discs within the unit form a wastewater guiding channel. Oily wastewater enters the adjacent separation discs from this channel, forming a multi-layered oily wastewater separation channel. This stacked structure effectively utilizes… Based on the principle of the oil-water separation system, the multi-layered oil-water flow channels significantly increase the coverage area and channel length of the oil-water interface. This not only promotes the aggregation, enlargement, and accelerated floating of oil droplets but also facilitates the collision and aggregation of tiny oil droplets, thereby improving the oil-water separation effect by a factor of several times compared to the stacked separation discs. Furthermore, the disc-shaped structure of the separation discs forms a 360° rotating separation channel, greatly increasing the coverage area of ​​the oil-water interface and allowing for more thorough oil-water separation, resulting in more ideal oil droplet aggregation and floating effects.

[0017] Also due to the oil and dirt water first through the spiral separation unit formed by the spiral flow, bending flow, greatly improved the collision of oil and dirt water gathering opportunities, promote the oil droplets become large floating; again through the stacked disk separation unit to increase the unit precipitation area, shorten the sedimentation distance, accelerate the oil-water separation, therefore the present application through the spiral channel separation and stacked disk large area precipitation synergies, greatly improved the separation efficiency of oil and dirt water. BRIEF DESCRIPTION OF DRAWINGS

[0018] The oil and dirt water high efficiency separator of the present application is further described in detail below in combination with the drawings and specific embodiments.

[0019] Figure 1 is a structural schematic diagram of a specific embodiment of the oil and dirt water high efficiency separator of the present application;

[0020] Figure 2 is Figure 1 A-A cross-sectional view in the

[0021] Figure 3 is Figure 1 B-B cross-sectional view in the

[0022] Figure 4 is Figure 1 cross-sectional structure schematic diagram of the spiral separation unit in the embodiment shown;

[0023] Figure 5 is Figure 1 cross-sectional structure schematic diagram of the stacked disk separation unit in the embodiment shown;

[0024] Figure 6 is Figure 5 cross-sectional structure schematic diagram of the separation disk in

[0025] Figure 7 is Figure 6 top view of

[0026] In the figure, 1 - separator cylinder, 2 - oil and dirt water input pipe, 3 - spiral separation cavity bottom plate, 4 - spiral separator variable diameter cylinder, 5 - spiral blade core shaft, 6 - variable diameter spiral blade, 7 - spiral separation cavity top plate, 8 - top cover plate, 9 - spiral drainage pipe, 10 - cylinder top cover, 11 - sewage riser, 12 - waste oil discharge pipe, 13 - stacked disk flow guide pipe, 14 - separation disk connecting bolt, 15 - separation disk spacer block, 16 - separation disk, 17 - sewage flow guide channel, 18 - stacked disk separator variable diameter cylinder, 19 - separated water discharge pipe, 20 - flow guide blind plate, 21 - cylinder bottom plate, 22 - oil and dirt water riser hole, 23 - oil and dirt water circulating cavity, 24 - separation disk center hole, 25 - waste oil cavity. DETAILED DESCRIPTION

[0027] In Figure 1 , Figure 2、 Figure 3 The oil and water separator shown has a closed cylindrical structure of the separator cylinder 1, and the cylinder top cover 10 of the separator cylinder 1 is in the shape of a spherical cap, which is conducive to the concentration of thick oil at the top of the cylinder top cover 10, and the thick oil is discharged through the thick oil discharge pipe 12. A stack of disc separation units is installed at the center of the cylinder cavity of the separator cylinder 1, and the stack of disc separator variable diameter cylinders 18 of the stack of disc separation units extends to the cylinder bottom plate 21 of the separator cylinder 1 to form a separated water discharge cavity. The separated water discharge pipe 19 is installed on the bottom section of the cylinder wall of the separator variable diameter cylinder 18, and the separated water discharge pipe 19 is connected to the separated water discharge cavity, and the separated water discharge pipe 19 is fixedly installed on the stack of disc separator variable diameter cylinder 18 and the separator cylinder 1 through the cylinder wall of the stack of disc separator variable diameter cylinder 18 and the separator cylinder 1.

[0028] There are four spiral separation units symmetrically distributed on the outer periphery of the stack of disc separation units, and the upper and lower ends of the four spiral separation units are respectively provided with spiral separation cavity top plates 7 and spiral separation cavity bottom plates 3, which are annular circular plates with a circular hole in the center. The spiral separation cavity top plates 7 and the spiral separation cavity bottom plates 3 are fixedly installed on the inner cylinder wall surface of the separator cylinder 1, and the center circular hole of the spiral separation cavity top plates 7 and the spiral separation cavity bottom plates 3 is used to accommodate the corresponding part of the extended stack of disc separation units.

[0029] The spiral separation cavity bottom plate 3, the cylinder wall and the cylinder bottom plate 21 of the separator cylinder 1 form an annular oil and water circulation cavity 23, and the oil and water input pipe 2 leads to the oil and water circulation cavity 23. The spiral separation cavity bottom plate 3 is provided with four oil and water rising holes 22, and each oil and water rising hole 22 corresponds to a spiral separation unit. The oil and water rising hole 22 leads to the lower port of the spiral flow channel of the spiral separation unit, and the oil and water enters the oil and water circulation cavity 23 from the oil and water input pipe 2, and then enters the corresponding spiral separation unit through the oil and water rising hole 22 on the spiral separation cavity bottom plate 3.

[0030] The spiral separation cavity top plate 7, the separator cylinder 1 and the cylinder top cover 10 form a thick oil cavity 25, and the thick oil discharge pipe 12 is installed on the cylinder wall of the separator cylinder 1, and the inner port of the thick oil discharge pipe 12 extends to the highest point of the thick oil cavity 25.

[0031] As Figure 4The shown spiral separation unit comprises a spiral separator variable-diameter cylinder 4 which is fixedly installed in the separator cylinder 1 and corresponds to the spiral separation chamber top plate 7 and the spiral separation chamber bottom plate 3. The spiral separator variable-diameter cylinder 4 comprises a converging cone section, a waist section and a diverging cone section from bottom to top. The waist section is a cylindrical structure, and the converging cone section and the diverging cone section are conical structures. The variable-diameter spiral blade 6 is fixedly installed in the spiral separator variable-diameter cylinder 4. The variable-diameter spiral blade 6 comprises a lower cone section, an equal waist section and an upper cone section from bottom to top. The lower cone section of the variable-diameter spiral blade 6 corresponds to the converging cone section of the spiral separator variable-diameter cylinder 4, the equal waist section of the variable-diameter spiral blade 6 corresponds to the waist section of the spiral separator variable-diameter cylinder 4, and the upper cone section of the variable-diameter spiral blade 6 corresponds to the diverging cone section of the spiral separator variable-diameter cylinder 4. The blade outer end of the variable-diameter spiral blade 6 and the inner wall surface of the spiral separator variable-diameter cylinder 4 are spaced apart to form a gap flow channel, so that most of the oil and sewage flows along the spiral flow channel formed by the spiral blade, and a small part flows along the gap flow channel. This can increase the collision and combination probability of small oil droplets in the oil and sewage and accelerate the oil and water separation. Although the diameters of the blade outer ends of the sections of the variable-diameter spiral blade 6 are different, the pitch of the variable-diameter spiral blade 6 is an equal pitch structure, the pitch t is 20 mm, and preferably the pitch t of the spiral blade 6 is controlled to be between 10 mm and 30 mm, which can increase the sedimentation and separation area of the oil and sewage channel and avoid the blockage of the oil and sewage channel.

[0032] The spiral separation chamber top plate 7 is fixedly installed above the variable-diameter spiral blade 6 and on the inner cylinder wall surface of the separator cylinder 1. The spiral separation chamber top plate 7, the separator cylinder 1, the spiral separator variable-diameter cylinder 4 and the spiral separation chamber bottom plate 3 form a separation chamber in which the variable-diameter spiral blade 6 is installed. The spiral blade core shaft 5 is fixedly installed between the spiral separation chamber top plate 7 and the spiral separation chamber bottom plate 3. The variable-diameter spiral blade 6 is fixedly installed on the spiral blade core shaft 5. The variable-diameter spiral blade 6 located in the spiral separator variable-diameter cylinder 4 forms a spiral flow channel, and the oil and sewage rising hole 22 provided on the spiral separation chamber bottom plate 3 corresponds to the lower end of the spiral flow channel. The spiral drainage pipe 9 is fixedly installed at the upper part of the spiral separator variable-diameter cylinder 4. The spiral drainage pipe 9 of each spiral separation unit is connected to the stacked disc separation unit.

[0033] In operation, the oil and sewage is input from the oil and sewage input pipe 2 to the oil and sewage circulating chamber 23, and then enters the separation chamber of the corresponding spiral separation unit through the oil and sewage rising hole 22. Most of the oil and sewage enters the separation chamber through the spiral flow channel formed by the spiral blade, and a small part enters the separation chamber through the gap between the spiral blade and the cylinder wall and then flows to the top of the separation chamber, and then flows to the stacked disc separation unit through the spiral drainage pipe 9.

[0034] AsFigure 5 The shown stacked disk separator unit includes a stacked disk separator reducer cylinder 18, which is a reducer cylinder of circular shape that is adapted to the shape of the spiral separator reducer cylinder 4, i.e. the stacked disk separator reducer cylinder 18 also includes an upper tapered section, an isosceles section and a lower tapered section. This reducer cylinder structure also changes the flow direction and flow rate of the sewage, which is conducive to the collision and enlargement of oil droplets. A top cover plate 8 is fixedly installed at the upper end of the stacked disk separator reducer cylinder 18, which can prevent the upward flow of water and force the water to flow downward. A plurality of separation disks 16 are fixedly installed below the top cover plate 8 and are spaced at equal distances from each other. Four separation disk spacers 15 are interposed between adjacent two separation disks 16. Separation disk connecting bolts 14 pass through the separation disks 16 and the separation disk spacers 15 to fixedly connect them to the top cover plate 8.

[0035] As shown in Figure 6 , Figure 7 The separation disk 16 includes a conical disk surface and a flat bottom annular surface. A separation disk center hole 24 is provided at the center of the flat bottom annular surface of the separation disk 16. Four separation disk spacers 15 are symmetrically interposed on the flat bottom annular surface of the separation disk 16. The separation disk spacers 15 and the separation disk 16 are provided with bolt holes for the separation disk connecting bolts 14 at corresponding positions.

[0036] The separation disk center holes 24 of the mutually stacked separation disks 16 form a sewage flow guide channel 17. A flow guide blind plate 20 is fixedly installed at the bottom end of the sewage flow guide channel 17. The flow guide blind plate 20 is also fixed by the separation disk connecting bolts 14, i.e. the separation disk connecting bolts 14 pass through the flow guide blind plate 20, the separation disks 16 and the separation disk spacers 15 from the lower end to the upper end to be fixedly connected to the top cover plate 8. The flow guide blind plate 20 prevents the sewage from flowing out from the bottom end of the sewage flow guide channel 17, and forces the sewage to flow out from the radial separation flow channels between the separation disks. A through-flow hole is also provided at the center position of the top cover plate 8, so that the spiral flow discharge pipe 9 passes through the stacked disk flow guide pipe 13, and the through-flow hole of the top cover plate leads to the sewage flow guide channel 17.

[0037] The outer periphery of the separation disk 16 and the inner cylinder surface of the stacked disk separator reducer cylinder 18 are spaced at equal distances, so as to form a backflow channel between the outer periphery of the separation disk 16 and the inner cylinder surface of the stacked disk separator reducer cylinder 18. Eight sewage oil rising pipes 11 are installed through the top cover plate 8. The upper ends of the sewage oil rising pipes 11 extend into a sewage oil cavity 25, and the lower ends of the sewage oil rising pipes 11 extend to the upper part of the backflow channel.

[0038] In operation, the sewage of the spiral separation unit enters into the sewage guide channel 17 through the spiral drainage pipe 9 and the stacked disc guide pipe 13. Due to the blocking effect of the guide blind plate 20, the sewage entering into the sewage guide channel 17 is forced to flow from the radial separation flow channels between the adjacent separation discs 16 to the return flow channel, and then is discharged from the separation water discharge pipe 19, realizing high-efficiency separation of oil and water.

[0039] The above are some preferred embodiments of the present application, and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications and replacements to the technical solutions recorded in the foregoing embodiments without departing from the spirit and principles of the present application, and these modifications and replacements all fall within the protection scope of the present application.

Claims

1. An oil-water separator, comprising a separator cylinder (1), characterized in that: The separator cylinder (1) is provided with a stacked disc separation unit, the lower part of the stacked disc separation unit is communicated with a separated water discharge pipe (19); at least two spiral separation units are arranged on the outer periphery of the stacked disc separation unit, the upper part of the stacked disc separation unit is communicated with the upper space of the spiral separation unit; the lower part of the separator cylinder (1) is provided with an oil and dirt water circulation cavity (23), the oil and dirt water circulation cavity (23) is communicated with the spiral separation unit, and the oil and dirt water circulation cavity (23) is communicated with an oil and dirt water input pipe (2); an oil dirt cavity (25) is arranged on the upper part of the separator cylinder (1), and the oil dirt cavity (25) is communicated with an oil dirt discharge pipe (12).

2. The oil-water separator according to claim 1, wherein: The spiral separation unit comprises a spiral separator variable-diameter cylinder (4), a variable-diameter spiral blade (6) is fixedly installed in the spiral separator variable-diameter cylinder (4), and the blade outer end of the variable-diameter spiral blade (6) is arranged at intervals with the inner wall surface of the spiral separator variable-diameter cylinder (4); the lower end of the spiral flow channel of the variable-diameter spiral blade (6) is communicated with the oil and dirt water circulation cavity (23) through an oil and dirt water rising through hole (22), and the upper space of the variable-diameter spiral blade (6) is communicated with a spiral flow discharge pipe (9).

3. The oil-water separator of claim 1, wherein: The spiral separator variable-diameter cylinder (4) is fixedly installed in the separator cylinder (1), a spiral separation cavity top plate (7) is fixedly installed above the spiral separator variable-diameter cylinder (4), a spiral separation cavity bottom plate (3) is fixedly installed below the spiral separator variable-diameter cylinder (4), and the upper and lower ends of the spiral blade core shaft (5) are fixedly connected with the spiral separation cavity top plate (7) and the spiral separation cavity bottom plate (3) respectively, and the variable-diameter spiral blade (6) is fixedly worn on the spiral blade core shaft (5).

4. The high-efficiency separator of oil-contaminated water according to claim 1, 2 or 3, characterized in that: The spiral flow discharge pipe (9) is communicated with the space below the spiral separation cavity top plate (7); the spiral separation cavity bottom plate (3) is a top plate of the oil and dirt water circulation cavity (23), and the oil and dirt water rising through hole (22) is located on the spiral separation cavity bottom plate (3).

5. The high-efficiency separator of oil-contaminated water according to claim 1, 2 or 3, characterized in that: The spiral separator variable-diameter cylinder (4) sequentially comprises a converging cone section, a waist section and a diverging cone section, and the converging cone section and the diverging cone section are respectively located at the upper and lower ends of the waist section; the variable-diameter spiral blade (6) sequentially comprises a lower cone section, an isosceles section and an upper cone section, and the lower cone section, the isosceles section and the upper cone section of the variable-diameter spiral blade (6) are respectively equally spaced corresponding to the converging cone section, the waist section and the diverging cone section of the spiral separator variable-diameter cylinder (4).

6. The high-efficiency separator of oil-contaminated water according to claim 1, characterized in that: The stacked disc separation unit comprises a stacked disc separator variable-diameter cylinder (18), a top cover plate (8) is fixedly installed at the upper end of the stacked disc separator variable-diameter cylinder (18), a plurality of mutually spaced stacked separation discs (16) are fixedly installed at the lower part of the top cover plate (8), the central holes of the mutually spaced stacked separation discs (16) constitute a sewage flow guide channel (17), and a flow guide blind plate (20) is arranged at the bottom end of the sewage flow guide channel (17).

7. The oil-water separator of claim 6, wherein: The spiral flow discharge pipe (9) is communicated with the upper end of the sewage flow guide channel (17), the sewage flow guide channel (17) is sequentially communicated with the interval channels between the separation discs (16) and the backflow channels between the separation discs (6) and the stacked disc separator variable-diameter cylinder (18) and communicated with the separated water discharge pipe (19).

8. The high-efficiency separator of oil-contaminated water according to claim 1, 6 or 7, characterized in that: The variable-diameter cylinder (18) of the stacked disc separator successively comprises a stacked disc cylinder upper taper section, a stacked disc cylinder isosceles section and a stacked disc cylinder lower taper section, the outer disc periphery of the separation disc (16) is arranged at equidistant intervals with the inner cylinder surface wall of the variable-diameter cylinder (18) of the stacked disc separator, and the outer disc periphery of several separation discs (16) forms a reflux passage with the inner cylinder surface of the variable-diameter cylinder (18) of the stacked disc separator.

9. The high-efficiency separator of oil-contaminated water according to claim 1, 6 or 7, characterized in that: The upper end of the dirty oil rising pipe (11) extends into the dirty oil cavity (25), and the separation disc spacer blocks (15) are arranged between adjacent separation discs (16), and the separation disc connecting bolts (14) are fixedly installed on the top cover plate (8) by penetrating the flow guide blind plate (20), the separation disc spacer blocks (15) and the separation discs (16).

10. The high-efficiency oil-water separator of claim 1, wherein: The outer periphery of the stacked disc separation unit is provided with 2-6 spiral separation units.

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