Floating oil recovery device

Abstract

[Problem] To provide a floating oil recovery device with which floating oil accumulated in an oil-water separation tank or an adjustment tank, etc. can be efficiently recovered in large amounts in a short time, and with which recovery efficiency of the floating oil does not decrease even when used over a long period of time. [Solution] A floating oil recovery device 1 for recovering floating oil accumulated in an oil-water separation tank T comprises: a spiral recovery cup 2 that is disposed on a water surface side of the oil-water separation tank T, and that has a shape in which the diameter tapers going downward; a first pipe 3 that is connected to a discharge port in the lower part of the spiral recovery cup 2, and that guides the recovered floating oil downward; a second pipe 4 that is disposed on a downstream side of the first pipe 3, and that guides the floating oil in the first pipe 3 in a horizontal direction; a third pipe 5 that is disposed on the downstream side of the second pipe 4, and that guides the floating oil in the second pipe 4 upward; a slider mechanism 6 that is disposed along an inner wall of the oil-water separation tank T, and that accommodates the third pipe 5 so that the third pipe can slide along an up-down direction; and a buoyancy material 7 that keeps an interval between the water surface and the spiral recovery cup 2 which is sunk in the oil-water separation tank T constant.

Description

Floating oil recovery device

[0001] The present invention relates to a floating oil recovery device for efficiently recovering floating oil that accumulates in an oil-water separation tank or an adjustment tank in a food factory or the like that discharges oil-containing wastewater.

[0002] Wastewater from food factories and other manufacturing plants contains various water pollutants (oils). If such wastewater is discharged without any treatment, the oils in the wastewater will adhere to and solidify in drainage pipes, causing blockages. This makes it difficult to purify the water in combined treatment tanks or sewage treatment plants, has a negative impact on the environment, and may result in legal restrictions that prevent businesses from continuing their operations. Therefore, various methods and devices have been proposed to efficiently recover wastewater containing solids such as oils, sediments, and suspended matter at each facility where it is discharged.

[0003] Methods for recovering floating oil contained in wastewater can be broadly divided into (1) suction and (2) adsorption. In the (1) suction method, for example, oil-containing wastewater is pooled in a large tank such as an oil-water separator, raw water tank, or adjustment tank, and the large amount of floating oil in the upper layer is physically sucked out and pumped out using a suction nozzle equipped with a float that responds to fluctuations in the liquid level. In the (2) adsorption method, sheet- or mat-shaped oil absorbents are placed in the oil-water separator, and the floating oil on the water surface is directly absorbed using these oil absorbents.

[0004] Other floating oil recovery devices have been disclosed, including a floating oil recovery device that can improve the recovery efficiency of floating oil (see, for example, Patent Document 1). Also disclosed is an oil separation and management device that includes a control device with an oil sensor and data transmission / reception means and that efficiently recovers oil from oil-containing wastewater (see, for example, Patent Document 2). Furthermore, a simple device that efficiently purifies wastewater containing oil and solids has also been disclosed (see, for example, Patent Document 3).

[0005] JP 2020-032348 A Utility Model Registration No. 3216173 A Patent No. 4420750 A

[0006] However, the above-mentioned floating oil recovery methods (1) suction type and (2) adsorption type have a fundamental problem in that it takes time to recover the floating oil. Particularly in large-scale food factories and other sites where a large amount of floating oil is generated, the above-mentioned floating oil recovery methods are unable to recover all the floating oil, and the floating oil accumulates. As a result, a foul odor is generated from the wastewater (pool), separation and removal of oil is often incomplete, and large-scale systems and facilities are required, which is costly.

[0007] In particular, floating oil that accumulates in oil-water separators installed on-site at food factories differs from common cutting oils and other machine oils in that it is made from animal and vegetable oils and has a relatively high viscosity and tends to solidify. For this reason, with conventional suction-type floating oil recovery methods, the oil that adheres to the float and the suction nozzle opening tends to solidify and stick. Once this type of situation occurs, the oil clogging the suction opening causes further problems, further reducing the efficiency of floating oil recovery.

[0008] In recent years, the problem of global warming has become more serious, and efforts are being made to reduce greenhouse gases such as carbon dioxide and methane, while renewable energy sources that reuse waste materials are attracting attention. Food factories and other facilities discharge more than one million tons of wastewater oils as biomass resources annually across Japan, and the total amount is even greater when considering the entire world. In recent years, technologies have been developed to produce unique biomass fuels from wastewater oils, which previously had no choice but to be disposed of as industrial waste as sludge. Using these fuels for boilers and power generation can reduce CO2 emissions, recycle resources, and purify water. In other words, in order to promote decarbonization and resource circulation, it is urgent to establish technologies that can efficiently recover recyclable oils from wastewater oils discharged from food factories and other facilities.

[0009] The present invention has been made in consideration of the above-mentioned problems, and aims to provide a floating oil recovery device that can efficiently recover large amounts of floating oil that accumulates in oil-water separation tanks and adjustment tanks in food factories and other facilities that discharge oil-containing wastewater in a short period of time, and that does not reduce the efficiency of recovering floating oil even when used over a long period of time.

[0010] In order to achieve the above-mentioned object, the present invention is a floating oil recovery device that recovers floating oil that has accumulated in an oil-water separation tank, and is characterized by comprising: a vortex recovery cup that is arranged on the water surface side of the oil-water separation tank and has a diameter that tapers downward; a first pipe that is connected to a lower outlet of the vortex recovery cup and guides the recovered floating oil downward; a second pipe that is arranged downstream of the first pipe and guides the floating oil in the first pipe horizontally; a third pipe that is arranged downstream of the second pipe and guides the floating oil in the second pipe upward; a slider mechanism that is arranged along the inner wall of the oil-water separation tank and accommodates the third pipe so that it can slide vertically; and a buoyancy material that maintains a constant distance between the vortex recovery cup submerged in the oil-water separation tank and the water surface.

[0011] In this floating oil recovery device, it is preferable that the floating oil recovery device further includes a suction pump for efficiently sucking the floating oil from the swirl recovery cup.

[0012] In this floating oil recovery device, the suction pump is an underwater pump or an air-driven pump, and it is preferable that the underwater pump or the air-driven pump is provided between the first pipe and the second pipe.

[0013] In this floating oil recovery device, the suction pump is a self-priming pump or an air-driven pump, and it is preferable that the self-priming pump or the air-driven pump is located on the ground downstream of the third pipe.

[0014] In this floating oil recovery device, it is preferable that the floating oil recovery device further includes a U-shaped pipe connected to the upper end of the third pipe, and a duct oil-resistant hose made of a flexible material, one end connected to the U-shaped pipe and the other end connected to the pipe side that guides the floating oil from the third pipe downstream.

[0015] In this floating oil recovery device, the slider mechanism comprises a piping fixing duct having a U-shaped horizontal cross section and an opening space extending in the vertical direction, and a plurality of rotating rollers that are horizontally mounted on opposite sides of the piping fixing duct and are provided on the opening side of the piping fixing duct, and it is preferable that the piping fixing duct is fixed to the inner wall of the oil-water separation tank so as to extend vertically, and the third piping is accommodated in the opening space inside the rotating rollers.

[0016] In this floating oil recovery device, the floating oil recovery device further includes a fastening device for fastening the third piping, and a plate-shaped or rod-shaped anti-rotation material fixed to the third piping using the fastening device, and it is preferable that the anti-rotation material be arranged in parallel along the side wall of the oil-water separation tank.

[0017] In this floating oil recovery device, it is preferable that the vortex recovery cup has a baffle plate erected at a predetermined height over a predetermined range of the upper edge, which is circular in plan view, and a weight plate provided over a predetermined range of the upper edge opposite the baffle plate.

[0018] In order to achieve the above-mentioned object, the present invention provides a floating oil recovery device for recovering floating oil accumulated in an oil-water separation tank, comprising: a vortex recovery cup arranged on the water surface side of the oil-water separation tank and having a diameter that tapers downward; a first pipe connected to a lower outlet of the vortex recovery cup and guiding the recovered floating oil downward; a second pipe arranged downstream of the first pipe and guiding the floating oil in the first pipe horizontally; a third pipe arranged downstream of the second pipe and guiding the floating oil in the second pipe upward; a coil-shaped tube interposed in the middle of the third pipe and expandable in the vertical direction; and a buoyancy material that maintains a constant distance between the vortex recovery cup submerged in the oil-water separation tank and the water surface.

[0019] In this floating oil recovery device, it is preferable that the floating oil recovery device further includes a connecting box that connects the third pipe, which has a different diameter, and the coiled tube.

[0020] The present invention provides a floating oil recovery device for recovering floating oil accumulated in an oil-water separation tank, comprising: a spiral recovery cup disposed on the water surface side of the oil-water separation tank and tapering downward in diameter; a first pipe connected to a discharge port below the spiral recovery cup and directing the recovered floating oil downward; a second pipe disposed downstream of the first pipe and directing the floating oil in the first pipe horizontally; a third pipe disposed downstream of the second pipe and directing the floating oil in the second pipe upward; a slider mechanism disposed along the inner wall of the oil-water separation tank and accommodating the third pipe so that it can slide vertically; and a buoyancy material that maintains a constant distance between the spiral recovery cup submerged in the oil-water separation tank and the water surface. With this configuration, the floating oil recovery device of the present invention efficiently recovers large amounts of floating oil accumulated in oil-water separation tanks and adjustment tanks in food factories and other facilities that discharge oil-containing wastewater in a short period of time, and the floating oil recovery efficiency does not decrease even when used for a long period of time.

[0021] 1 is a diagram showing an example of the configuration of a floating oil recovery device according to an embodiment of the present invention. FIG. 1 is a diagram showing an example of the configuration of the same floating oil recovery device. (a) A diagram showing a state in which the water level of the oil-water separation tank of the same floating oil recovery device has dropped, (b) A diagram showing the water level of the oil-water separation tank of the same floating oil recovery device in a standard state. (a) A diagram showing the water level of the oil-water separation tank of the same floating oil recovery device in a standard state, (b) A cross-sectional view along line A-A. FIG. 2 is an explanatory diagram of a slider mechanism provided in the same floating oil recovery device. (a) A plan view of a swirl recovery cup provided in the same floating oil recovery device, (b) A side view of the same swirl recovery cup, (c) A side view of the same swirl recovery cup from another angle, and (d) A diagram explaining the water flow around the same swirl recovery cup. FIG. 2 is a diagram showing an example of the configuration of a floating oil recovery device according to a modified embodiment of the present invention. FIG. 3 is a diagram showing an example of the configuration of a floating oil recovery device according to a modified embodiment of the present invention. (a) A side view of the coiled tube and connecting box provided in the floating oil recovery device, (b) A plan view of the coiled tube and connecting box.

[0022] (Embodiment) A floating oil recovery device according to an embodiment of the present invention will be described with reference to Figures 1 to 6. This floating oil recovery device is a device for efficiently pumping out the floating oil (floating grease, hereinafter referred to as floating oil) that floats in large quantities in an oil-water separation tank (raw water tank, adjustment tank) that pools manufacturing wastewater discharged from a food factory or the like. The floating oil pumped out from the floating oil recovery device is temporarily stored in an oil-mud recycling device, where the oil and sludge components are efficiently separated from the recovered floating oil, and the water remaining after separation is returned to the oil-water separation tank as influent (return water). These devices are basically installed on-site at food factories and the like that discharge manufacturing wastewater.

[0023] First, the basic configuration of a floating oil recovery device according to this embodiment will be described with reference to Fig. 1. As shown in Fig. 1, the floating oil recovery device 1 is a device for recovering floating oil (oil-containing wastewater) accumulated in an oil-water separation tank T, and includes a vortex recovery cup 2, a first pipe 3, a second pipe 4, a third pipe 5, a slider mechanism 6, and a buoyancy material 7, and is used while submerged in the oil-water separation tank T. The oil-water separation tank T is also sometimes called a grease trap, oil trap, or grease interceptor, and its basic structure generally employs a natural separation and flotation method that utilizes the difference in specific gravity between water and oil.

[0024] The vortex collection cup 2 is placed on the water surface side of the oil-water separation tank T and has the same bowl shape as a deep suction nozzle, with a diameter that tapers downward (tapered). This vortex collection cup has a relatively large diameter, for example, about 300 to 700 mm, and is able to suck up a large amount of floating oil in a swirling manner at once.

[0025] 6(a) to 6(c), the swirl collection cup 2 has a baffle plate 21 that stands upright at a predetermined height (e.g., 250 mm) over a predetermined range (e.g., a range of 120 to 180 degrees) of the upper edge of the cup, which is circular in plan view, and a weight plate (SUS plate) 22 that is approximately the same weight as the baffle plate 21 and is provided over a predetermined range of the upper edge opposite the baffle plate 21, welded to it. This weight plate 22 configuration makes only the baffle plate 21 side of the swirl collection cup 2 heavier, thereby appropriately preventing the swirl collection cup 2 from tilting and keeping the swirl collection cup 2 horizontal at all times.

[0026] Here, we will explain the method of recovering floating oil in the swirl collection cup 2. When return water from the oil-mud recycling system R is forcefully discharged onto the water surface of the oil-water separation tank T via the return pipe 20, a current in a predetermined direction is generated on the water surface, causing the floating oil to move. At this time, as shown by the arrow in Figure 6(d), the floating oil hits the baffle plate 21 near the swirl collection cup 2 and swirls, and the oil-containing wastewater (floating oil) with a high (floating) waste oil content circulates around the baffle plate 21 and is efficiently sucked into the suction port of the swirl collection cup 2. As a result, the floating oil is efficiently recovered in the swirl collection cup and is led to the oil-mud recycling system R via the first pipe 3 to the third pipe 5.

[0027] The first pipe 3 is, for example, a PVC pipe having a diameter of about 25 mm, and is connected to the discharge port at the bottom of the swirl collection cup 2 to guide the floating oil collected in the swirl collection cup 2 downward.

[0028] The second pipe 4 is located downstream of the first pipe 3 and guides the floating oil in the first pipe 3 horizontally. It is, for example, a PVC pipe with a diameter of approximately 50 mm. As shown in Figure 2, a suction pump 8 is installed between the first pipe 3 and the second pipe 4 to efficiently suck the floating oil from the vortex collection cup 2. Specifically, the suction pump 8 is a submersible pump 8 equipped with a motor for generating a water flow, and its main body is submerged upside down in the oil-water separation tank T. The suction port of the submersible pump 8 is connected to the first pipe 3, and its discharge port is connected to the second pipe 4. The submersible pump 8 weighs, for example, approximately 8 kg. Instead of the submersible pump 8, an air-driven pump may be used, which generates compressed air using an air compressor and utilizes the force of the air's expansion.

[0029] The oil-water separation tank T is usually 1 m or more deep, and the height of the floating oil recovery device 1 is, for example, 700 mm in total, consisting of a 50 mm distance from the water surface to the upper edge of the vortex recovery cup 2, a 150 mm height for the vortex recovery cup 2, a 100 mm height for the buoyancy material 7, and a 400 mm height for the submersible pump 8. This allows the floating oil recovery device 1 to remain floating in the oil-water separation tank T.

[0030] The third pipe 5 is disposed downstream of the second pipe 4 and guides the floating oil in the second pipe 4 upward, and is, for example, a PVC pipe with a diameter of about 50 mm. By making the diameters of the second pipe 4 and the third pipe 5 about 50 mm, it is possible to prevent foreign matter contained in the sucked floating oil from clogging the pipes and causing problems. In this embodiment, as shown in Figure 3, the second pipe 4 and the third pipe 5 are threadedly connected (jointed) at a right angle via an L-shaped pipe 41.

[0031] The slider mechanism 6 is fixed and disposed along the inner wall of the oil-water separation tank T and accommodates the third pipe 5 so that it can slide vertically. More specifically, as shown in FIGS. 3 to 5 , the slider mechanism 6 includes a pipe fixing duct 61 having a U-shaped horizontal cross section and a slit-shaped opening 61a extending vertically, and a plurality of rotating rollers 62 disposed on the opposite side of the pipe fixing duct 61 and on the opening side of the pipe fixing duct 61. As shown in FIG. 3 , the pipe fixing duct 61 has its bottom fixed to the inner wall of the oil-water separation tank T using anchor bolts so as to extend vertically, and is made of a relatively strong metal such as stainless steel. The rotating rollers 62 are composed of, for example, a shaft 62a fixed to the pipe fixing duct 61 and a rotatable resin pipe 62b. Because it is assumed that oil will clog the third pipe 5, the spacing between the rotating rollers 62 and the third pipe 5 is adjusted to be relatively loose. The third pipe 5 is disposed in the open space 61a inside the rotating roller 62. This slider mechanism 6 allows the floating oil recovery device 1 to move up and down in accordance with the height of the water surface in the oil-water separation tank T, and to always maintain a constant distance from the water surface.

[0032] As shown in Figures 3 to 5, the floating oil recovery device 1 further includes a U-shaped pipe 9 connected to the upper end of the third pipe 5, and a duct oil-resistant hose 10 made of a flexible (flexible, elastic) material. One end of the duct oil-resistant hose 10 is connected to the U-shaped pipe 9, and the other end is connected to an inlet pipe 22 that guides floating oil from the third pipe 5 downstream. The U-shaped pipe 9 may be formed by connecting two L-shaped pipes, as long as it has a U-shape. The duct oil-resistant hose 10 is, for example, a 50 mm diameter PVC pipe (HT50A), and must be slackened to an optimal length so that it expands when the water level drops and relaxes when the water level rises. In other words, the duct oil-resistant hose 10 has a length that allows it to bend appropriately without being fully stretched, even when the vortex recovery cup 2 is lowered to the bottom.

[0033] For example, assuming that the standard is to accommodate a vertical difference of 200 mm above or below the water surface, Figure 3(a) shows the state in which the water surface in the oil-water separation tank T has dropped 200 mm after the floating oil has been collected, while Figure 3(b) shows the state in which the water surface is at its normal position after oil-containing wastewater has flowed in. As shown in this figure, the duct oil-resistant hose 10 can always maintain a constant distance from the water surface.

[0034] The floating oil that has passed through the duct oil-resistant hose 10 is introduced into an oil-mud recycling device R (oil and sludge recovery tank) that temporarily stores the upper layer of the oil-water separation tank T and recovers the oil and sludge via a connection part 21 and an inlet pipe 22 as shown in Figure 2. The provision of the connection part 21 makes it possible to easily disconnect the floating oil recovery device 1 from the main device pipe when maintenance of the floating oil recovery device 1 is required.

[0035] In the oil-mud recycling system R, oil and water are separated according to their specific gravities, with the floating oil forming the upper layer and the influent water forming the lower layer, and this influent water is recycled and recovered in the oil-water separation tank T via the return pipe 20. As a result, in the oil-mud recycling system R, oil, sludge and water are separated from the oil-containing wastewater recovered using the floating oil recovery device 1, and the oil is efficiently extracted, recovered and recycled.

[0036] The buoyancy material 7 is a float plate that maintains a constant distance between the swirl collection cup 2 submerged in the oil-water separation tank T and the water surface. Specifically, the buoyancy material 7 is made of a material, such as polystyrene foam, that has enough buoyancy to prevent the swirl collection cup 2 from sinking into the waste oil layer in the oil-water separation tank T due to its weight. The swirl collection cup 2 weighs, for example, approximately 5 kg, and the submersible pump 8 weighs approximately 8 kg. The weight of the entire floating oil recovery device 1 is constant at approximately 15 kg. The buoyancy of the buoyancy material 7 is adjusted by adjusting the number and thickness of the suction surfaces (top surfaces) of the swirl collection cups 2 to maintain a distance of, for example, 50 mm below the water surface of the oil-water separation tank T. This distance is adjusted according to the viscosity of the floating oil being recovered. For floating oils with high viscosity, the distance is shorter, and for floating oils with low viscosity, the distance is longer.

[0037] 3, the floating oil recovery device 1 further includes a fastener 11a, such as a U-shaped screw, for fastening the third pipe 5, and a plate- or rod-shaped anti-rotation member 11b fixed to the third pipe 5 using the fastener 11a. The anti-rotation member 11b is arranged parallel to but spaced from the side wall of the oil-water separation tank T so that its longitudinal direction is along the side wall, preventing rotation and twisting of the third pipe 5. As a result, it has the function of preventing the vortex recovery cup 2 from shifting forward, backward, left, or right, and maintaining its orientation in a fixed direction.

[0038] As described above, the present invention provides a floating oil recovery device 1 for recovering floating oil accumulated in an oil-water separation tank T, comprising: a swirl recovery cup 2 disposed on the water surface side of the oil-water separation tank T and having a diameter tapering downward; a first pipe 3 connected to a lower outlet of the swirl recovery cup 2 and guiding the recovered floating oil downward; a second pipe 4 disposed downstream of the first pipe 3 and guiding the floating oil in the first pipe 3 horizontally; a third pipe 5 disposed downstream of the second pipe 4 and guiding the floating oil in the second pipe 4 upward; a slider mechanism 6 disposed along the inner wall of the oil-water separation tank T and accommodating the third pipe 5 so that it can slide vertically; and a buoyancy material 7 for maintaining a constant distance between the swirl recovery cup 2 submerged in the oil-water separation tank T and the water surface. With this configuration, the present invention efficiently recovers a large amount of floating oil accumulated in an oil-water separation tank T or an adjustment tank in a food factory or the like that discharges oil-containing wastewater, in a short period of time, and the floating oil recovery efficiency does not decrease even when used over a long period of time.

[0039] Floating oil in food factories has the characteristic of being "highly viscous and prone to solidification due to being animal and vegetable oils and fats." However, when it flows into the oil-water separation tank T or the adjustment tank and floats to the surface, it is still sufficiently liquid, and if it is collected at this timing in a short time, it can be collected easily and most efficiently. The floating oil collection device 1 of the present invention solves this problem. In fact, in a floating oil collection test using the "swirl collection cup 2" at Toyo Suisan's Hidaka factory, more than 100 L of floating oil was collected in one go in about 15 minutes of operation.

[0040] Furthermore, in recent years, unlike restaurants, some food factories have been generating several tons of floating oil and fat every day, and by installing a floating oil recovery device 1 such as that of the present invention in an oil-water separation tank T on the factory premises, it is possible to provide a service of extracting reusable oil from the recovered oil-containing wastewater and recycling it on-site. In other words, there is no doubt that the floating oil recovery device 1 of the present invention can be effectively used to realize a decarbonized society.

[0041] (Variation 1) A floating oil recovery device according to Variation 1 of this embodiment will now be described. In this Variation 1, as shown in Figure 1, the suction pump 8 is a self-priming pump or an air-driven pump, and is located on the ground downstream of the third pipe 5. In this case, compared to the above embodiment, the underwater weight is lighter, so the buoyancy material 7 can be made thinner, and since a submersible pump is not required, the floating oil recovery device 1 can be made significantly smaller, for example, to a height of 300 mm, and as a result, it can be installed in a relatively shallow oil-water separation tank T.

[0042] (Variation 2) A floating oil recovery device according to Variation 2 of this embodiment will be described with reference to Figures 7 to 9. In this Variation 2, instead of the slider mechanism 6 described above, a coiled tube 30 is provided that is interposed midway along the third pipe 5 and is extendable in the vertical direction. This coiled tube 30 has a spiral shape and is extendable in the vertical direction. Also, a connection box 31 is provided that connects the third pipe 5 and the coiled tube 30. As shown in Figure 9, this connection box 31 connects the third pipe 5, which has a diameter of, for example, 50 mm, to multiple coiled tubes 30 with smaller diameters (for example, 25 mm + 25 mm).

[0043] The present invention is not limited to the configuration of the above embodiment, and various modifications are possible within the scope of the invention. For example, in addition to the submersible pump 8, a dedicated submersible pump that creates a flow on the water surface of the oil-water separation tank T may be provided to increase the collection efficiency of the vortex collection cup 2.

[0044] REFERENCE SIGNS LIST 1 Floating oil recovery device 2 Swirl recovery cup 3 First pipe 4 Second pipe 5 Third pipe 6 Slider mechanism 7 Buoyancy material 8 Suction pump (submersible pump, air-driven pump, self-priming pump) 9 U-shaped pipe 10 Duct oil-resistant hose 11a Binding device 11b Rotation prevention material 30 Coiled tube 31 Connection box 61 Duct for fixing pipe 61a Open space 62 Rotating roller

Claims

1. A floating oil recovery device for recovering floating oil accumulated in an oil-water separation tank, comprising: a swirl recovery cup arranged on the water surface side of the oil-water separation tank and having a shape whose diameter tapers downward; a first pipe connected to a lower outlet of the swirl recovery cup and guiding the recovered floating oil downward; a second pipe arranged downstream of the first pipe and guiding the floating oil in the first pipe horizontally; a third pipe arranged downstream of the second pipe and guiding the floating oil in the second pipe upward; a slider mechanism arranged along the inner wall of the oil-water separation tank and accommodating the third pipe so that it can slide vertically; and a buoyancy material that maintains a constant distance between the swirl recovery cup submerged in the oil-water separation tank and the water surface.

2. The floating oil recovery device according to claim 1, further comprising a suction pump for efficiently sucking the floating oil from the swirl recovery cup.

3. A floating oil recovery device as described in claim 2, characterized in that the suction pump is an underwater pump or an air-driven pump, and the underwater pump or the air-driven pump is provided between the first piping and the second piping.

4. A floating oil recovery device as described in claim 2, characterized in that the suction pump is a self-priming pump or an air-driven pump, and the self-priming pump or air-driven pump is located on the ground downstream of the third piping.

5. The floating oil recovery device as described in claim 1, further comprising: a U-shaped pipe connected to the upper end of the third pipe; and a duct oil-resistant hose made of a flexible material, one end of which is connected to the U-shaped pipe and the other end of which is connected to a pipe side that guides the floating oil from the third pipe downstream.

6. The slider mechanism comprises: a duct for fixing piping having a U-shaped horizontal cross section and an opening space extending in the vertical direction; and a plurality of rotating rollers horizontally disposed on opposing sides of the duct for fixing piping and provided on the opening side of the duct for fixing piping; the duct for fixing piping is fixed to the inner wall of the oil-water separation tank so as to extend vertically; and the third pipe is accommodated in the opening space inside the rotating rollers, characterized in that the floating oil recovery device described in claim 1.

7. The floating oil recovery device as described in claim 1, further comprising a fastening device for engaging the third piping, and a plate-shaped or rod-shaped anti-rotation material fixed to the third piping using the fastening device, the anti-rotation material being arranged in parallel along the side wall of the oil-water separation tank.

8. The floating oil recovery device as described in claim 1, characterized in that the swirl recovery cup has a baffle plate arranged at a predetermined height over a predetermined range of the upper edge which is circular in a plan view, and a weight plate arranged over a predetermined range of the upper edge opposite the baffle plate.

9. A floating oil recovery device for recovering floating oil accumulated in an oil-water separation tank, comprising: a swirl recovery cup arranged on the water surface side of the oil-water separation tank and having a shape whose diameter tapers downward; a first pipe connected to a lower outlet of the swirl recovery cup and guiding the recovered floating oil downward; a second pipe arranged downstream of the first pipe and guiding the floating oil in the first pipe horizontally; a third pipe arranged downstream of the second pipe and guiding the floating oil in the second pipe upward; a coil-shaped tube arranged midway through the third pipe and capable of expanding and contracting in the vertical direction; and a buoyancy material for maintaining a constant distance between the swirl recovery cup submerged in the oil-water separation tank and the water surface.

10. The floating oil recovery device as described in claim 9, further comprising a connecting box connecting the third pipe having a different diameter and the coiled tube.

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