JP7249903B2 - floating oil tank - Google Patents

Description

The present invention relates to floating oil tanks.

Conventionally, the structure of patent document 1 is known as a floating oil tank. Patent Literature 1 describes a tank in which liquid containing oil is stored, and a floating oil recovery device (floating oil suction device) that recovers floating oil by floating on the surface of the liquid.

JP 2015-54301 A

Conventional floating oil tanks have room for improvement in terms of efficiently collecting floating oil.

In view of the above circumstances, it is an object of the present invention to provide a floating oil tank capable of efficiently recovering floating oil.

One aspect of the floating oil tank of the present invention includes a tank in which a liquid containing oil is stored, a bubble generating nozzle immersed in the liquid and releasing air bubbles into the liquid, and a bubble generating nozzle floating on the surface of the liquid. A floating oil recovery device for recovering floating oil, and guide means arranged in the tank for guiding the flow of the liquid, wherein the guide means is arranged in a horizontal direction in which the liquid in the tank flows. A first partition plate is disposed downstream of the bubble generating nozzle and upstream of the floating oil recovery device in the first direction, wherein the first partition plate is an upper end portion of the first partition plate is positioned below the liquid surface, the tank has a pair of lateral walls spaced apart from each other in a second horizontal direction orthogonal to the first direction, and the first The partition plate includes a plate-like first main body portion, a first elastic portion projecting from an end portion of the first main body portion in the second direction to be expandable and contractible in the second direction, and contacting the lateral wall; have
Further, one aspect of the floating oil tank of the present invention includes a tank in which a liquid containing oil is stored, a bubble generating nozzle immersed in the liquid and emitting air bubbles into the liquid, and a bubble generating nozzle that floats on the surface of the liquid. a floating oil recovery device for recovering floating oil; and guide means disposed in the tank for guiding the flow of the liquid. an upstream vertical wall connected to an upstream end of the bottom wall in a first direction in which the liquid flows; the bubble generating nozzles are provided in plurality; A second partition plate is arranged upstream of at least one of the plurality of bubble generating nozzles and downstream of the upstream vertical wall in the first direction, The second partition plate has a pair of lateral walls spaced apart from each other in a second direction perpendicular to the first direction, and the second partition plate includes a plate-shaped second main body portion and the second main body portion of the second main body portion. a second stretchable portion that protrudes from two end portions so as to be stretchable in the second direction and contacts the lateral wall;

According to the present invention, the bubbles discharged into the liquid from the bubble generating nozzle rise, thereby generating an upward flow in the liquid, and the oil in the liquid floats to the liquid surface together with the bubbles. As a result, separation of oil and water in the liquid is promoted, and the floating oil can be efficiently recovered by the floating oil recovery device. In addition, even if the length of the tank is short, the floating oil can be efficiently floated to the liquid surface and recovered. As a result, the floating oil tank can be compactly constructed, and the space can be saved. For example, the floating oil tank can be easily installed even when the installation space of the facility is limited.

The floating oil tank comprises guide means arranged in the tank for guiding the flow of the liquid.

In this case, the guide means can guide the flow of the liquid. Specifically, for example, the guide means guides the flow of the liquid that rises together with the air bubbles, so that the floating oil can be efficiently collected in the vicinity of the floating oil recovery device. Further, the guide means can prevent interference between the flow of the liquid flowing into the tank from the equipment of the preceding process and the flow of the liquid rising with the air bubbles in the tank.

In the floating oil tank, the guide means is arranged downstream of the bubble generating nozzle and upstream of the floating oil recovery device in a first horizontal direction in which the liquid in the tank flows. A first partition plate is provided, and the upper end of the first partition plate is positioned below the liquid surface .

In this case, the first partition plate is arranged on the downstream side of the bubble generation nozzle and the upstream side of the floating oil recovery device in the first direction, and partitions between the bubble generation nozzle and the floating oil recovery device. For this reason, on the upstream side of the first partition plate, the flow of the liquid rising together with the air bubbles is guided by the first partition plate, and the floating oil easily rises to the liquid surface quickly. That is, the floating oil is made to reach the liquid surface quickly while the oil in the liquid is suppressed from flowing in the first direction. The floating oil floating on the liquid surface flows downstream in the first direction between the upper end of the first partition plate and the liquid surface, that is, in the vicinity of the liquid surface, and is efficiently collected near the floating oil recovery device. . Thereby, the efficiency of recovering the floating oil is further enhanced. Moreover, even if the length of the tank in the first direction is short, the floating oil can be efficiently floated to the liquid surface and collected, and the floating oil tank can be configured more compactly.

In the floating oil tank, the tank has a pair of lateral walls spaced apart from each other in a second horizontal direction perpendicular to the first direction, and the first partition plate has a plate-like shape. and a first stretchable portion projecting from an end portion of the first body portion in the second direction so as to be stretchable in the second direction and contacting the lateral wall .

In this case, by increasing or decreasing the amount of protrusion of the first elastic portion that protrudes in the second direction from the first body portion, the first elastic portion can be pressed against the lateral wall or separated from the lateral wall. That is, the first partition plate can be detachably fixed to the lateral wall of the tank by expanding and contracting the first elastic portion. According to this configuration, the mounting position of the first partition plate can be finely adjusted in the tank, and the floating oil recovery efficiency can be further enhanced. Since there is no need to embed anchor bolts or the like in the lateral walls of the tank, the structure of the tank can be simplified and the mounting position of the first partition plate can be freely adjusted.
In the floating oil tank, it is preferable that the mounting position of the first partition plate is adjustable in at least one of the first direction and the vertical direction in the tank.
In this case, the installation position of the first partition plate in the tank can be adjusted according to the degree of contamination (oil content) of the liquid, for example, so that the floating oil collection efficiency can be enhanced.

In the above-described floating oil tank, it is preferable that the first partition plate has a first sealing portion that seals a gap between an end portion of the first body portion in the second direction and the lateral wall.

In this case, the first sealing portion suppresses the oil-containing liquid from flowing in the first direction through the gap between the end portion of the first body portion in the second direction and the lateral wall. Therefore, the floating oil is stably made to float on the liquid surface on the upstream side of the first partition plate, and the recovery efficiency of the floating oil is enhanced.

In the floating oil tank, the tank includes a bottom wall and an upstream vertical wall connected to an upstream end of the bottom wall in a first horizontal direction in which the liquid in the tank flows. , wherein a plurality of the bubble generating nozzles are provided, and the guide means is located upstream of at least one of the plurality of bubble generating nozzles and downstream of the upstream vertical wall in the first direction. It has a second partition plate arranged in the .

In this case, the second partition plate is arranged upstream of at least one of the plurality of bubble generating nozzles and downstream of the upstream vertical wall in the first direction, and the at least one bubble generating nozzle and the upstream vertical wall partition between Therefore, on the downstream side of the second partition plate, the flow of the liquid rising together with the air bubbles is guided by the second partition plate, so that the floating oil tends to float to the liquid surface quickly. Further, on the upstream side of the second partition plate, the oil-containing liquid sent from the preceding process equipment of the floating oil tank is caused to flow into the tank through the gap between the second partition plate and the upstream vertical wall. In other words, the second partition guides the upward movement of the liquid on the downstream side of the second partition plate, and guides the inflow (fall) of the liquid on the upstream side of the second partition plate. The second partition plate can suppress interference between the flow of the liquid flowing into the tank from the equipment of the preceding process and the flow of the liquid rising together with the air bubbles in the tank. As a result, the floating oil collection efficiency can be enhanced.

In the floating oil tank, the tank has a pair of lateral walls spaced apart from each other in a second horizontal direction perpendicular to the first direction, and the second partition plate has a plate-like shape. and a second stretchable portion protruding from an end of the second body portion in the second direction in the second direction so as to be stretchable and in contact with the lateral wall .

In this case, by increasing or decreasing the amount of protrusion of the second expandable portion that protrudes in the second direction from the second body portion, the second expandable portion can be pressed against the lateral wall or separated from the lateral wall. That is, the second partition plate can be detachably fixed to the lateral wall of the tank by expanding and contracting the second elastic portion. According to this configuration, the mounting position of the second partition plate can be finely adjusted in the tank, and the floating oil recovery efficiency can be further enhanced. Since there is no need to embed anchor bolts or the like in the lateral walls of the tank, the structure of the tank can be simplified and the mounting position of the second partition plate can be freely adjusted.
In the floating oil tank, it is preferable that the mounting position of the second partition plate is adjustable in at least one of the first direction and the vertical direction in the tank.
In this case, for example, depending on the degree of contamination of the liquid (oil content) and the amount of inflow into the tank from the equipment in the previous process, the installation position of the second partition plate in the tank is adjusted to prevent the floating oil from Collection efficiency can be improved.

In the floating oil tank, it is preferable that the second partition plate has a second sealing portion that seals a gap between an end portion of the second body portion in the second direction and the lateral wall.

In this case, the second sealing portion suppresses the oil-containing liquid from flowing in the first direction through the gap between the second-direction end portion of the second body portion and the lateral wall. Therefore, the interference between the liquid flowing on the upstream side of the second partition plate and the liquid flowing on the downstream side of the second partition plate is further suppressed, and the floating oil recovery efficiency is enhanced.

In the floating oil tank, the bubble generating nozzles are spaced apart from each other in a first horizontal direction in which the liquid in the tank flows and in a second horizontal direction perpendicular to the first direction. It is preferable to provide a plurality of openings.

In this case, the plurality of bubble generating nozzles spaced apart in the first direction and the second direction can efficiently float the oil in the liquid to the liquid surface.

In the floating oil tank, it is preferable that the bubble generating nozzle emits air bubbles upward in the liquid.

In this case, the bubbles easily rise to the surface of the liquid, and the oil in the liquid can rise to the surface more efficiently.

Preferably, in the floating oil tank, the bubble generating nozzle emits microbubbles into the liquid.

In this case, the bubble generating nozzle emits microbubbles as air bubbles into the liquid, so that the action (function) of the microbubbles efficiently separates oil from the liquid and floats to the liquid surface.

In the above-described floating oil tank, the bubble generating nozzle includes a cylindrical body having a central axis and extending in the axial direction of the central axis, an inner body disposed inside the cylindrical body, and a The flow path includes an inflow-side flow path portion positioned at one end in the axial direction of the cylindrical body and an outflow-side flow path portion positioned at the other end in the axial direction of the cylindrical body. and a microbubble-generating channel portion positioned between the inflow-side channel portion and the outflow-side channel portion in the axial direction and communicating with the inflow-side channel portion and the outflow-side channel portion. and, the microbubble generation channel portion is formed by the inner peripheral surface of the cylindrical body and the outer peripheral surface of the inner body, and the microbubble generation channel portion extends toward the other side in the axial direction and a diameter-reduced flow passage portion disposed on the other side in the axial direction of the increased-diameter flow passage portion and communicated with the increased-diameter flow passage portion, and having a reduced diameter toward the other side in the axial direction; It is preferable to have

In this case, the microbubble generation channel portion of the bubble generation nozzle has an enlarged diameter channel portion and a reduced diameter channel portion. For this reason, the liquid in the bubble generation nozzle flows from the enlarged diameter channel portion to the reduced diameter channel portion in the microbubble generation channel portion, thereby changing the pressure of the liquid in the channel and exerting centrifugal force on the liquid. As a result, microbubbles are generated in the liquid.

According to the bubble generation nozzle having the above configuration, it is possible to generate microbubbles while simplifying the structure without forming a spiral flow path as in the conventional structure. Therefore, it is easy to manufacture the bubble generating nozzle. Further, in the bubble generating nozzle having the above structure, it is easier to reduce the total length in the axial direction, in particular, compared to the conventional structure. Therefore, the outer shape of the bubble generating nozzle can be kept compact.

In the floating oil tank, the floating oil recovery device includes a float portion floating on the liquid surface, a suction pipe portion supported by the float portion, and a nozzle portion connected to the suction pipe portion and arranged on the liquid surface. and a suction source that is connected to the suction pipe portion and sucks the oil floating on the liquid surface from the nozzle portion through the suction pipe portion, and the nozzle portion moves away from the suction pipe portion in the horizontal direction. It is preferable to have a bottom wall portion that extends obliquely downward and is inserted into the liquid surface.

In this case, the bottom wall portion of the nozzle portion extends obliquely downward as it moves away from the suction pipe portion in the horizontal direction, and is obliquely inserted with respect to the liquid surface. Therefore, when liquids such as oil and water that float on the bottom wall are sucked obliquely upward along the slope of the bottom wall, liquids such as water on the bottom wall are The inclination of the part makes it easier to return to the liquid surface. In addition, the floating oil on the bottom wall can be easily lifted obliquely upward along the slope of the bottom wall. As a result, the amount (ratio) of liquid such as water recovered can be reduced, and the efficiency of recovering floating oil can be enhanced.

Preferably, the floating oil tank comprises a pump section for pumping the liquid from the bottom of the tank, pressurizing it, and sending it to the bubble generating nozzle.

In this case, the liquid is pumped out by the pump from the bottom of the tank away from the surface of the floating oil, pressurized and sent to the bubble generating nozzle, and the liquid is discharged into the tank together with the air bubbles. A small amount of liquid can be effectively used for separating the floating oil. As a result, the running cost of the floating oil tank can be reduced. In addition, since the liquid pressurized by the pump section is sent to the bubble generating nozzle, oil and dust in the bubble generating nozzle are ejected out of the nozzle together with the liquid, thereby suppressing clogging inside the nozzle. Therefore, the function of the bubble generating nozzle is maintained well, and the frequency of maintenance and member replacement of the bubble generating nozzle can be reduced.

According to the floating oil tank of one aspect of the present invention, the floating oil can be recovered efficiently.

It is a longitudinal section showing a floating oil tank of a 1st embodiment. It is a top view which shows the floating oil tank of 1st Embodiment. FIG. 3 is an enlarged view showing part III of FIG. 2; FIG. 3 is an enlarged view showing part IV of FIG. 2; FIG. 4 is a front view showing a bubble generating nozzle; FIG. 6 is a longitudinal sectional view showing a VI-VI section of FIG. 5; FIG. 4 is a rear view showing a bubble generating nozzle; It is a top view which shows a floating oil collection|recovery apparatus. It is a side view which shows a floating oil collection|recovery apparatus, and includes a schematic diagram partially. It is a side view which shows the nozzle part of a floating oil collection|recovery apparatus. FIG. 11 is a side view showing a first modification of the nozzle portion of FIG. 10; FIG. 11 is a side view showing a second modification of the nozzle portion of FIG. 10; FIG. 11 is a side view showing a third modification of the nozzle portion of FIG. 10; It is (a) a top view, (b) a side view, and (c) a front view which show the bottom wall member of the nozzle part of FIG. It is a side view which shows the nozzle part of the floating oil collection|recovery apparatus with which the floating oil tank of 2nd Embodiment is equipped. FIG. 16 is a top view showing a bottom wall member of the nozzle portion of FIG. 15; FIG. 16 is a longitudinal sectional view showing a bottom wall member of the nozzle portion of FIG. 15;

<First embodiment>
A floating oil tank 1 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 14. FIG.
The floating oil tank 1 of the present embodiment constitutes a part of a waste liquid treatment system for treating waste liquid such as processing water in a can manufacturing factory. In the floating oil tank 1, oil, dust, etc. (hereinafter simply referred to as "oil") contained in the discharged liquid D are separated from water, etc., and float on the liquid surface LS of the liquid D to be foamy, liquid, and Floating oil F in a semi-solid state or the like is obtained. The floating oil F is recovered by a floating oil recovery device 10 floating on the liquid surface LS.
Although not shown, the waste liquid treatment system has at least a pH tank and a band tank in addition to the floating oil tank 1 . The pH tank is equipment provided in a process preceding the floating oil tank 1 . The pH bath has a function of adjusting the pH of the liquid D with dilute sulfuric acid or the like. A band tank is equipment provided in a post-process of the floating oil tank 1 . The banding tank has a function of flocculating and sedimenting suspended solids, suspended solids, etc. contained in the liquid D by adding a flocculating agent such as aluminum sulfate (aluminum sulfate). The band tank may also be called an inorganic flocculant addition tank.
In addition, the liquid D supplied to the floating oil tank 1 is not limited to the waste liquid of the can manufacturing factory.

As shown in FIGS. 1 and 2, the floating oil tank 1 includes a tank 2, a bubble liquid feeding pipe 3, a bubble generating nozzle 110, a drawing pipe 6, a pump section 5, a guide means 4, and a floating oil tank. It includes a recovery device 10 and a post-process liquid-sending pipe 7 .

The tank 2 has a rectangular parallelepiped container shape. The upper part of the tank 2 is opened. In the top view shown in FIG. 2, the tank 2 has a rectangular shape. A liquid D containing oil is stored in the tank 2 . The liquid D is made to flow into one longitudinal end of the tank 2 (the right end of the tank 2 in FIGS. 1 and 2) from the facility (pH tank) preceding the floating oil tank 1 . The liquid D in the tank 2 flows from one longitudinal end of the tank 2 to the other end (the left end of the tank 2 in FIGS. 1 and 2), and is sucked from the other end by the post-process liquid feeding pipe 7. and sent to post-process equipment (band bath).

In this embodiment, the vertical direction, that is, the gravitational direction is called the vertical direction. The vertical direction is the depth direction of the tank 2 .
Among the horizontal directions, the direction in which the liquid D in the bath 2 flows is called a first direction FD. In this embodiment, the first direction FD is the direction from one end (right end) to the other end (left end) of the longitudinal direction of the tank 2 . Note that the first direction FD may be called the downstream side (or the downstream side in the first direction FD), and the direction opposite to the first direction FD may be called the upstream side (or the upstream side in the first direction FD).
A horizontal direction perpendicular to the first direction FD is called a second direction SD. In this embodiment, the second direction SD is the width direction of the tank 2 .

The tank 2 has a bottom wall 2a, an upstream vertical wall 2b, a downstream vertical wall 2c, and a pair of horizontal walls 2d. The upstream vertical wall 2b, the downstream vertical wall 2c, and the pair of horizontal walls 2d constitute the peripheral walls (side walls) of the tank 2. As shown in FIG.

The bottom wall 2a is arranged at the lowest part of the tank 2. As shown in FIG. The bottom wall 2a extends horizontally.
The upstream vertical wall 2b connects to the upstream end of the bottom wall 2a in the first direction FD. The upstream vertical wall 2b extends upward from the upstream end of the bottom wall 2a. The upstream vertical wall 2b extends in a direction perpendicular to the first direction FD.

The downstream vertical wall 2c connects to the downstream end of the bottom wall 2a in the first direction FD. The downstream vertical wall 2c extends upward from the downstream end of the bottom wall 2a. The downstream vertical wall 2c extends in a direction perpendicular to the first direction FD.
The pair of lateral walls 2d are spaced apart from each other in the second direction SD. The pair of lateral walls 2d face each other with a gap in the second direction SD. A pair of lateral walls 2d are connected to both ends of the bottom wall 2a in the second direction SD. The lateral wall 2d extends upward from the end of the bottom wall 2a in the second direction SD. The lateral wall 2d extends in a direction perpendicular to the second direction SD.

The liquid D pressure-fed from the pump unit 5 flows inside the bubble liquid-sending pipe 3 . In this embodiment, as the liquid D, the liquid D in the tank 2 is pumped out and used. A filter (not shown) is provided in the system between the air bubble liquid feeding pipe 3 and the pump section 5 . The filter captures dust and the like of a predetermined size or larger in the liquid D sent from the pump section 5 to the air bubble liquid sending pipe 3 .
The air bubble liquid feeding pipe 3 includes a first pipe portion 3a, a first branch pipe portion 3b, a second pipe portion 3c, a valve portion 3f, a second branch pipe portion 3d, a third pipe portion 3e, have

The first pipe portion 3 a is a pipe portion that receives the liquid D sent from the pump portion 5 into the bubble liquid sending pipe 3 . The first pipe portion 3 a is arranged above the tank 2 . The end of the first pipe portion 3a on the outlet side, that is, the end on the outflow side of the liquid D extends in the first direction FD. The outlet-side end of the first pipe portion 3a is located in the center of the tank 2 in the second direction SD.

The first branch pipe portion 3b is connected to the outlet-side end of the first pipe portion 3a. The first branch pipe portion 3 b is arranged above the tank 2 . The first branch pipe portion 3b extends in the second direction SD. In the present embodiment, the outlet-side end of the first pipe portion 3a is connected to the center portion of the first branch pipe portion 3b in the second direction SD. The pipe diameter (inner diameter) of the first branch pipe portion 3b decreases stepwise as it moves away from the connecting portion with the first pipe portion 3a in the second direction SD. Specifically, the pipe diameter of the first branch pipe portion 3b becomes smaller as it moves away from the connection portion with the first pipe portion 3a in the second direction SD and exceeds the connection portion with the second pipe portion 3c.

A plurality of second pipe portions 3c are provided. Each second pipe portion 3c is connected to the first branch pipe portion 3b with a space therebetween in the second direction SD. In this embodiment, the plurality of second pipe portions 3c are arranged at equal pitches in the second direction SD. Each second pipe portion 3c protrudes in the first direction FD from the first branch pipe portion 3b.

The second pipe portion 3c has an upstream pipe portion extending in the first direction FD and a downstream pipe portion extending in the vertical direction.
The upstream pipe portion has an upstream end connected to the first branch pipe portion 3b. The upstream piping section is arranged above the tank 2 .
An upper end portion of the downstream pipe portion is connected to an end portion of the upstream pipe portion in the first direction FD. The downstream pipe portion extends vertically from above the tank 2 to the bottom of the tank 2 .

A plurality of valve portions 3f are provided. Each valve portion 3f is provided in an upstream pipe portion of each second pipe portion 3c. The valve portion 3f permits or blocks the circulation of the liquid D flowing inside the second pipe portion 3c by being opened and closed. By opening the valve portion 3f, the liquid D and air bubbles can be discharged from the bubble generating nozzle 110 communicating with the second pipe portion 3c. By closing the valve portion 3f, the discharge of the liquid D and air bubbles from the bubble generating nozzle 110 communicating with the second pipe portion 3c can be stopped.

A plurality of second branch pipe portions 3d are provided. Each second branch pipe portion 3d is connected to the lower end portion of the downstream pipe portion of each second pipe portion 3c. That is, the plurality of second branch pipe portions 3d are spaced apart from each other in the second direction SD, and are arranged at equal pitches in the present embodiment.
The second branch pipe portion 3 d is arranged in the liquid D in the tank 2 . The second branch pipe portion 3d extends in the first direction FD. In the present embodiment, the lower end of the downstream pipe portion of the second pipe portion 3c is connected to the center portion of the second branch pipe portion 3d in the first direction FD. The pipe diameter (inner diameter) of the second branch pipe portion 3d gradually decreases with distance in the first direction FD from the connecting portion with the second pipe portion 3c. Specifically, the pipe diameter of the second branch pipe portion 3d becomes smaller as it moves away from the connection portion with the second pipe portion 3c in the first direction FD and exceeds the connection portion with the third pipe portion 3e.

A plurality of third pipe portions 3e are provided. Each third pipe portion 3e is connected to the second branch pipe portion 3d with a space therebetween in the first direction FD. In this embodiment, the plurality of third pipe portions 3e are arranged at equal pitches in the first direction FD. The third pipe portion 3e protrudes upward from the second branch pipe portion 3d. An outlet-side end of the third pipe portion 3e opens upward.
Further, the respective third pipe portions 3e of the plurality of second branch pipe portions 3d are arranged at equal pitches in the second direction SD. That is, in the present embodiment, the plurality of third pipe portions 3e are arranged at equal pitches in the first direction FD and the second direction SD.

The bubble generating nozzle 110 is connected to the outlet side end of the bubble liquid feeding pipe 3 . A plurality of bubble generating nozzles 110 are provided. Each bubble generating nozzle 110 is connected to an outlet-side end of each third pipe portion 3e. That is, a plurality of bubble generating nozzles 110 are provided at intervals in the first direction FD and the second direction SD. In this embodiment, the bubble generating nozzles 110 are arranged at equal pitches in the first direction FD and the second direction SD. The number of bubble generating nozzles 110 is, for example, 16 or more, and is 24 in this embodiment.

The bubble generating nozzle 110 is immersed in the liquid D in the bath 2 . The bubble generating nozzle 110 discharges the liquid D sent from the bubble liquid sending pipe 3 and bubbles into the liquid D in the tank 2 . This air bubble is created by the liquid D flowing through the bubble generating nozzle 110 . The bubble generating nozzle 110 emits air bubbles upward in the liquid D in the bath 2 . Specifically, the bubble generating nozzle 110 releases microbubbles into the liquid D in the bath 2 . That is, the bubbles emitted by the bubble generating nozzle 110 contain microbubbles.

The bubble generating nozzle 110 is made of resin, for example.
As shown in FIGS. 5 to 7, the bubble generating nozzle 110 has a central axis A and includes a cylindrical body 111 extending in the axial direction of the central axis A, an inner body 112, a connecting cylinder 113, and a sealing member 114. , and a channel 115 formed inside the cylindrical body 111 .
The liquid D sent from the bubble liquid sending pipe 3 to the bubble generating nozzle 110 flows from one end of the cylindrical body 111 to the other end in the direction in which the central axis A of the cylindrical body 111 extends. It circulates inside the channel 115 .

In this embodiment, the direction in which the central axis A of the cylinder 111 extends is called the axial direction. As shown in FIG. 1, when the bubble generating nozzle 110 is immersed in the liquid D in the bath 2, the axial direction is the vertical direction. In the axial direction, the upstream side of the liquid D flowing in the flow path 115 of the cylinder 111 is called the one axial side, and the downstream side is called the other axial side. In this embodiment, the one axial side is the right side in FIG. 6, and the other axial side is the left side in FIG. As shown in FIG. 1, when the bubble generating nozzle 110 is immersed in the liquid D in the tank 2, one axial side is the lower side and the other axial side is the upper side.
A direction orthogonal to the central axis A is called a radial direction. Of the radial directions, the direction approaching the central axis A is called the radial inner side, and the direction away from the central axis A is called the radial outer side.
The direction of rotation around the central axis A is called the circumferential direction.

As shown in FIGS. 5 to 7, the cylinder 111 has an outer cylinder 116, an upstream inner cylinder 117, a downstream inner cylinder 118, and a nozzle cap 119. As shown in FIGS.
The outer cylinder 116 has a multistage tubular shape extending in the axial direction around the central axis A. As shown in FIG. The outer cylinder 116 has a small-diameter tubular portion 116a, a large-diameter tubular portion 116b, an annular plate portion 116c, and an annular concave portion 116e.

The small-diameter tubular portion 116a has a cylindrical shape extending in the axial direction. The small-diameter tubular portion 116a is located at one end of the outer tube 116 in the axial direction. The small-diameter tubular portion 116a has a pipe connection threaded portion 116d on the outer peripheral surface of the small-diameter tubular portion 116a. The small-diameter cylindrical portion 116a is connected to the third pipe portion 3e of the liquid-sending pipe 3 for air bubbles using a pipe connection threaded portion 116d.

The large-diameter tubular portion 116b has a cylindrical shape extending in the axial direction. The large-diameter cylindrical portion 116b is located in a portion of the outer cylinder 116 other than the end on one side in the axial direction. The outer diameter of the large-diameter tubular portion 116b is larger than the outer diameter of the small-diameter tubular portion 116a. The inner diameter of the large-diameter tubular portion 116b is larger than the inner diameter of the small-diameter tubular portion 116a. The large-diameter tubular portion 116b has a female threaded portion 116f at the end on the other side in the axial direction of the inner peripheral surface of the large-diameter tubular portion 116b.

The annular plate portion 116c has an annular plate shape centered on the central axis A, and a pair of plate surfaces face the axial direction. Each plate surface of the annular plate portion 116c has a planar shape extending in a direction perpendicular to the central axis A. As shown in FIG. The inner peripheral portion of the annular plate portion 116c is connected to the other axial end portion of the small-diameter cylindrical portion 116a. The outer peripheral portion of the annular plate portion 116c is connected to one axial end portion of the large-diameter tubular portion 116b.

The annular concave portion 116e is arranged at a corner where the inner peripheral surface of the small-diameter cylindrical portion 116a and the plate surface of the annular plate portion 116c facing the other side in the axial direction are connected. The annular recessed portion 116e is located at the end portion on the other side in the axial direction of the inner peripheral surface of the small-diameter cylindrical portion 116a. The annular concave portion 116e is recessed radially outward from the inner peripheral surface of the small-diameter cylindrical portion 116a and extends in the circumferential direction. The annular recessed portion 116e is positioned at the radially inner end portion of the plate surface of the annular plate portion 116c facing the other side in the axial direction. The annular recessed portion 116e is recessed in one axial direction from a plate surface facing the other axial side of the annular plate portion 116c and extends in the circumferential direction. The annular recessed portion 116e has a circular annular shape centering on the central axis A. As shown in FIG.

The upstream inner cylinder 117 has a tubular shape extending in the axial direction around the central axis A. As shown in FIG. The upstream inner cylinder 117 is arranged inside the outer cylinder 116 . The upstream inner cylinder 117 fits into the large-diameter cylinder portion 116b. The outer diameter of the upstream inner cylinder 117 is substantially constant along the axial direction. The inner diameter of the upstream inner cylinder 117 increases stepwise toward the other side in the axial direction. An end surface of the upstream inner cylinder 117 facing one side in the axial direction has a planar shape extending in a direction perpendicular to the central axis A. As shown in FIG. The end surface of the upstream inner cylinder 117 facing one side in the axial direction contacts the plate surface of the annular plate portion 116c facing the other side in the axial direction. The end surface of the upstream inner cylinder 117 facing the other side in the axial direction has a planar shape extending in a direction perpendicular to the central axis A. As shown in FIG.

The upstream inner cylinder 117 has an enlarged diameter inner peripheral surface portion 120 on the inner peripheral surface of the upstream inner cylinder 117 . That is, the cylindrical body 111 has an enlarged diameter inner peripheral surface portion 120 that forms part of the inner peripheral surface of the cylindrical body 111 . The enlarged diameter inner peripheral surface portion 120 is arranged over the entire inner peripheral surface of the upstream inner cylinder 117 . The diameter-enlarged inner peripheral surface portion 120 increases in diameter toward the other side in the axial direction.

The enlarged diameter inner peripheral surface portion 120 has a first enlarged diameter uneven portion 121 in which uneven shapes are repeated along the axial direction. The first enlarged-diameter concave-convex portion 121 has a plurality of convex portions 121a and a plurality of concave portions 121b. In a cross-sectional view (longitudinal cross-sectional view) along the central axis A shown in FIG.

The downstream inner cylinder 118 has a tubular shape extending in the axial direction around the central axis A. As shown in FIG. The downstream inner cylinder 118 is arranged inside the outer cylinder 116 . The downstream inner cylinder 118 fits into the large-diameter cylinder portion 116b. The outer diameter of the downstream inner cylinder 118 is substantially constant along the axial direction. The inner diameter of the downstream inner cylinder 118 gradually decreases toward the other side in the axial direction. An end surface of the downstream inner cylinder 118 facing one axial side is planar and extends in a direction perpendicular to the central axis A. As shown in FIG. The end surface of the downstream inner cylinder 118 facing one side in the axial direction contacts the end surface of the upstream inner cylinder 117 facing the other side in the axial direction. The end surface of the downstream inner cylinder 118 facing the other side in the axial direction has a planar shape extending in a direction perpendicular to the central axis A. As shown in FIG.

The downstream inner cylinder 118 has a seal groove 118a on the end face facing the other side in the axial direction. The seal groove 118a is recessed toward one axial side from the end surface of the downstream inner cylinder 118 facing the other axial side and extends in the circumferential direction. The seal groove 118a has a circular annular shape centering on the central axis A. As shown in FIG.

The downstream inner cylinder 118 has a reduced diameter inner peripheral surface portion 122 on the inner peripheral surface of the downstream inner cylinder 118 . That is, the cylindrical body 111 has a diameter-reduced inner peripheral surface portion 122 that forms part of the inner peripheral surface of the cylindrical body 111 . The diameter-reduced inner peripheral surface portion 122 is arranged over the entire inner peripheral surface of the downstream inner cylinder 118 . The diameter-reduced inner peripheral surface portion 122 is arranged on the other side in the axial direction of the enlarged diameter inner peripheral surface portion 120 and has a smaller diameter toward the other side in the axial direction.

The diameter-reduced inner peripheral surface portion 122 has a first diameter-reduced uneven portion 123 in which uneven shapes are repeated along the axial direction. The first reduced-diameter concave-convex portion 123 has a plurality of convex portions 123a and a plurality of concave portions 123b. In the vertical cross-sectional view shown in FIG. 6, the convex portions 123a and the concave portions 123b are arranged alternately in the first diameter-reduced concave-convex portion 123. As shown in FIG.

The nozzle cap 119 has a substantially columnar or plate-like shape with the central axis A as the center. The nozzle cap 119 has a cap body portion 119a, a protruding portion 119b, a fitting shaft 119c, and an ejection hole 119d.

The cap main body portion 119a has a substantially disc shape centered on the central axis A. As shown in FIG. A plate surface of the cap main body 119a facing one side in the axial direction has a planar shape extending in a direction perpendicular to the central axis A. As shown in FIG. A plate surface of the cap main body 119a facing one side in the axial direction contacts an end surface of the downstream inner cylinder 118 facing the other side in the axial direction. The cap body portion 119a has a male screw portion 119e on the outer peripheral surface of the cap body portion 119a. The male threaded portion 119e is screwed to the female threaded portion 116f of the large diameter cylindrical portion 116b.

The protruding portion 119b protrudes to the other axial side from the plate surface of the cap main body portion 119a facing the other axial side. The projecting portion 119b has a substantially conical shape centered on the central axis A and extends in the axial direction. The projecting portion 119b has an outer diameter that decreases toward the other side in the axial direction. The protruding portion 119b protrudes to the other side in the axial direction from the opening of the ejection hole 119d on the other side in the axial direction.

The fitting shaft 119c protrudes to one side in the axial direction from a plate surface of the cap body portion 119a that faces one side in the axial direction. The fitting shaft 119c has a cylindrical shape centered on the central axis A and extends in the axial direction.

The ejection holes 119d penetrate the nozzle cap 119 in the axial direction. The ejection hole 119d is circular. The ejection hole 119d has an opening on one side in the axial direction and an opening on the other side in the axial direction. An opening on one side in the axial direction of the ejection hole 119d is located radially outside the fitting shaft 119c. An opening on one side in the axial direction of the ejection hole 119d expands in diameter toward the one side in the axial direction. The opening on the other side in the axial direction of the ejection hole 119d is located radially outside the projecting portion 119b.
A plurality of ejection holes 119 d are provided in the nozzle cap 119 . 119 d of several ejection holes are arranged in the circumferential direction around the central axis A at equal pitches. In this embodiment, twelve ejection holes 119d are arranged at equal intervals in the circumferential direction.

The inner body 112 is arranged inside the cylindrical body 111 . The inner body 112 is arranged radially inward of the upstream inner cylinder 117 and the downstream inner cylinder 118 . The inner body 112 has a substantially columnar shape or a substantially plate shape centering on the central axis A. As shown in FIG. The inner body 112 has an outer diameter that increases from both ends in the axial direction toward the central portion. An end surface of the inner body 112 facing one side in the axial direction is planar and extends in a direction perpendicular to the central axis A. As shown in FIG. An end surface of the inner body 112 facing the other side in the axial direction is planar and extends in a direction perpendicular to the central axis A. As shown in FIG. The end face of the inner body 112 facing the other side in the axial direction contacts the plate surface of the cap body portion 119a facing the one side in the axial direction.

The inner body 112 has an enlarged diameter outer peripheral surface portion 124, a reduced diameter outer peripheral surface portion 125, a projection portion 112a, a fitting hole 112b, and an annular groove portion 112c.
The diameter-enlarged outer peripheral surface portion 124 constitutes a portion of the outer peripheral surface of the inner body 112 on one side in the axial direction. That is, the diameter-enlarged outer peripheral surface portion 124 constitutes a part of the outer peripheral surface of the inner body 112 . The enlarged diameter outer peripheral surface portion 124 is arranged along the entire circumference of the outer peripheral surface of the inner body 112 on one side in the axial direction. The diameter-enlarged outer peripheral surface portion 124 increases in diameter toward the other side in the axial direction. The enlarged diameter outer peripheral surface portion 124 is arranged to face the enlarged diameter inner peripheral surface portion 120 with a gap therebetween.

The diameter-enlarged outer peripheral surface portion 124 has a second diameter-enlarged uneven portion 126 in which uneven shapes are repeated along the axial direction. The second enlarged diameter concave-convex portion 126 has a plurality of convex portions 126a and a plurality of concave portions 126b. 6, the convex portions 126a and the concave portions 126b are alternately arranged side by side in the second diameter-enlarged concave-convex portion 126. As shown in FIG.
The convex portion 121a of the first enlarged diameter concave-convex portion 121 and the convex portion 126a of the second enlarged diameter concave-convex portion 126 are arranged to face each other. The recessed portion 121b of the first enlarged diameter uneven portion 121 and the recessed portion 126b of the second enlarged diameter uneven portion 126 are arranged to face each other.

The diameter-reduced outer peripheral surface portion 125 configures a portion of the outer peripheral surface of the inner body 112 on the other side in the axial direction. That is, the diameter-reduced outer peripheral surface portion 125 constitutes a part of the outer peripheral surface of the inner body 112 . The diameter-reduced outer peripheral surface portion 125 is arranged along the entire circumference of the outer peripheral surface of the inner body 112 on the other side in the axial direction. The diameter-reduced outer peripheral surface portion 125 is disposed on the other axial side of the enlarged diameter outer peripheral surface portion 124 and has a diameter that decreases toward the other axial side. The diameter-reduced outer peripheral surface portion 125 is arranged to face the reduced-diameter inner peripheral surface portion 122 with a gap therebetween.

The diameter-reduced outer peripheral surface portion 125 has a second diameter-reduced uneven portion 127 in which uneven shapes are repeated along the axial direction. The second reduced-diameter concave-convex portion 127 has a plurality of convex portions 127a and a plurality of concave portions 127b. 6, the protrusions 127a and the recesses 127b are alternately arranged side by side in the second diameter-reduced protrusions and recesses 127. As shown in FIG.
The convex portion 123a of the first diameter-reduced uneven portion 123 and the convex portion 127a of the second diameter-reduced uneven portion 127 are arranged to face each other. The concave portion 123b of the first diameter-reduced uneven portion 123 and the concave portion 127b of the second diameter-reduced uneven portion 127 are arranged to face each other.

The protruding portion 112a protrudes from the end surface of the inner body 112 facing the one axial side in the axial direction. The projecting portion 112a has a substantially conical shape centered on the central axis A and extends in the axial direction. The projection 112a has an outer diameter that decreases toward one side in the axial direction.

The fitting hole 112b is recessed toward one side in the axial direction from the end surface of the inner body 112 facing the other side in the axial direction. The fitting hole 112b has a circular hole shape centered on the central axis A and extends in the axial direction. A fitting shaft 119c is fitted in the fitting hole 112b.

The annular groove portion 112c is recessed toward the other axial side from the end surface of the inner body 112 facing the one axial side and extends in the circumferential direction. The annular groove portion 112c has a circular ring shape centering on the central axis A. As shown in FIG. The annular groove portion 112c is located radially outside the projection portion 112a. The annular groove portion 112c is located on the other side in the axial direction of the annular recessed portion 116e and faces the annular recessed portion 116e with a gap in the axial direction.

The connecting cylinder 113 has a cylindrical shape extending in the axial direction around the central axis A. As shown in FIG. The connecting tube 113 connects the tubular body 111 and the inner body 112 . One axial end of the connecting tube 113 is fitted into the annular recess 116e. In this embodiment, the one axial end of the connecting tube 113 is also fitted radially inward of the one axial end of the upstream inner tube 117 . The end portion on the other side in the axial direction of the connecting cylinder 113 is fitted into the annular groove portion 112c.

The connecting tube 113 has a connection hole 113a that penetrates the peripheral wall of the connecting tube 113 in the radial direction. A plurality of connection holes 113 a are provided in the connecting tube 113 . The plurality of connection holes 113a are arranged in the circumferential direction around the central axis A at equal pitches. In this embodiment, 12 connection holes 113a are arranged at equal intervals in the circumferential direction.

The sealing member 114 has a circular ring shape centering on the central axis A. As shown in FIG. The seal member 114 is, for example, an elastic member such as an O-ring. The seal member 114 is arranged in the seal groove 118a. The seal member 114 contacts the plate surface of the cap main body 119a facing one side in the axial direction.

The flow path 115 is arranged inside the cylindrical body 111 and penetrates the cylindrical body 111 in the axial direction. The liquid D flows into the flow path 115 from the bubble liquid-sending pipe 3 . The liquid D flows through the channel 115 from one axial end to the other axial end.
The flow path 115 includes an inflow-side flow path portion 130 positioned at one axial end of the cylindrical body 111 , an outflow-side flow path portion 131 positioned at the other axial end of the cylindrical body 111 , an axial a microbubble generation channel portion 132 positioned between the inflow side channel portion 130 and the outflow side channel portion 131 in the direction and communicating with the inflow side channel portion 130 and the outflow side channel portion 131 .

The inflow-side channel portion 130 is formed by the inner peripheral surface of the small-diameter tubular portion 116a, the inner peripheral surface of the connecting tube 113, the connection hole 113a, the end surface of the inner body 112 facing one axial direction, and the protrusion 112a. be done. The inflow-side channel portion 130 has a plurality of connection channel portions 130 a that are located at the other end portion in the axial direction of the inflow-side channel portion 130 and connected to the microbubble generation channel portion 132 . Each connection channel portion 130a is formed by each connection hole 113a. The plurality of connection flow path portions 130a are arranged in the circumferential direction around the central axis A at equal pitches. In this embodiment, 12 connecting flow path portions 130a are arranged at equal intervals in the circumferential direction.

The outflow channel portion 131 has a plurality of ejection channel portions 131 a connected to the microbubble generation channel portion 132 . Each ejection channel portion 131a is formed by each ejection hole 119d. The plurality of ejection passage portions 131a are arranged in the circumferential direction around the central axis A at equal pitches. In the present embodiment, 12 ejection passage portions 131a are arranged at equal intervals in the circumferential direction.

The microbubble generation channel portion 132 is formed by the inner peripheral surface of the tubular body 111 and the outer peripheral surface of the inner body 112 . The microbubble generation channel portion 132 has an annular shape extending in the circumferential direction around the central axis A. As shown in FIG. The microbubble generation channel portion 132 is arranged between the upstream inner cylinder 117 and the downstream inner cylinder 118 and the inner body 112 in the radial direction.
The microbubble generation channel portion 132 has an enlarged diameter channel portion 132a and a reduced diameter channel portion 132b.

The enlarged diameter flow path portion 132a has an enlarged diameter toward the other side in the axial direction. The diameter-enlarged channel portion 132a is located on one side of the microbubble generating channel portion 132 in the axial direction. The enlarged diameter flow path portion 132 a is formed by an enlarged diameter inner peripheral surface portion 120 and an enlarged diameter outer peripheral surface portion 124 .

The diameter-reduced passage portion 132b is arranged on the other axial side of the enlarged diameter passage portion 132a, communicates with the enlarged diameter passage portion 132a, and decreases in diameter toward the other axial side. The diameter-reduced channel portion 132b is located on the other side in the axial direction of the microbubble generating channel portion 132 . The diameter-reduced flow passage portion 132 b is formed by the diameter-reduced inner peripheral surface portion 122 and the diameter-reduced outer peripheral surface portion 125 .

As shown in FIGS. 1 and 2 , the pumping pipe 6 is a pipe for pumping out the liquid D in the tank 2 . The pumping pipe 6 is connected to the pump section 5 . The pumping pipe 6 pumps out the liquid D at the bottom of the tank 2 located in the first direction FD relative to the first partition plate 8 of the guide means 4 , which will be described later, and feeds it to the pump section 5 .

The pump unit 5 pumps out the liquid D from the bottom of the tank 2 through the pumping pipe 6 , pressurizes the liquid D, and sends it to the bubble generating nozzle 110 through the bubble liquid feeding pipe 3 . The pump unit 5 is a circulation pump that pumps up the liquid D in the tank 2 and returns it to the tank 2 through the bubble generating nozzle 110 .

A guide means 4 is arranged in the tank 2 to guide the flow of the liquid D. As shown in FIG. In this embodiment, the guide means 4 guides the flow of bubbles discharged from the bubble generating nozzle 110 and the upward flow of the liquid D caused by the flow of the bubbles. Further, the guide means 4 guides the downward flow of the liquid D flowing into the tank 2 from the facility (pH tank) of the preceding process of the floating oil tank 1 .
The guide means 4 has a first partition plate 8 and a second partition plate 9 .

The first partition plate 8 is arranged downstream of the bubble generating nozzle 110 and upstream of the floating oil recovery device 10 in the first direction FD. The first partition plate 8 has a plate shape extending in a direction orthogonal to the first direction FD. In this embodiment, the first partition plate 8 has a rectangular plate shape.

The upper end of the first partition plate 8 is located below the liquid surface LS. That is, the first partition plate 8 is entirely arranged in the liquid D in the bath 2 . The floating oil F that floats from the liquid D can flow in the first direction FD through the upper side of the upper end portion of the first partition plate 8 .
The first partition plate 8 is arranged such that the lower end of the first partition plate 8 is separated upward from the bottom wall 2a. A gap is provided in the vertical direction between the lower end of the first partition plate 8 and the bottom wall 2a. Through this gap, the liquid D at the bottom of the tank 2 can flow upstream in the first direction FD.

The mounting position of the first partition plate 8 can be adjusted in at least one of the first direction FD and the vertical direction within the tank 2 . In this embodiment, the mounting position of the first partition plate 8 in the tank 2 can be adjusted in the first direction FD, and the mounting position can also be adjusted in the vertical direction. That is, the position of the first partition plate 8 can be adjusted in the tank 2 in the first direction FD, the vertical direction, and a direction (diagonal direction) combining the first direction FD and the vertical direction.

As shown in FIG. 3, the first partition plate 8 includes a plate-like first main body portion 8a and an end portion of the first main body portion 8a in the second direction SD so as to extend and contract in the second direction SD. It has a first stretchable portion 8b that contacts the lateral wall 2d, and a first sealing portion 8c that seals a gap between the lateral wall 2d and the end of the first body portion 8a in the second direction SD.

The first body portion 8a has a rectangular plate shape extending in a direction perpendicular to the first direction FD. The length of the first body portion 8a in the second direction SD is smaller than the distance in the second direction SD between the pair of lateral walls 2d. The vertical length of the first body portion 8 a is smaller than the vertical distance between the bottom wall 2 a and the liquid surface LS, that is, the depth of the liquid D in the tank 2 .

In the present embodiment, the first stretchable portion 8b is provided at the end of the first body portion 8a in the second direction SD by screwing. By adjusting the amount of screwing of the first elastic portion 8b into the first main body portion 8a in the second direction SD, the amount of protrusion of the first elastic portion 8b from the first main body portion 8a in the second direction SD is adjusted. It is possible.
The first elastic portion 8b is, for example, a rubber base adjuster.

A plurality of first elastic portions 8b are provided. The plurality of first stretchable portions 8b are arranged at intervals in the vertical direction at the ends of the first main body portion 8a in the second direction SD, and are arranged at equal pitches in the present embodiment. Further, the first stretchable portions 8b are provided at both ends of the first main body portion 8a in the second direction SD. That is, the plurality of first stretchable portions 8b protrude outward in the second direction SD from both end portions of the first main body portion 8a in the second direction SD.

The first stretchable portion 8b has a first threaded portion 8d screwed to the first body portion 8a, and a first contact portion 8e fixed to the first threaded portion 8d and in contact with the lateral wall 2d.
The outer diameter of the first contact portion 8e is larger than the outer diameter of the first threaded portion 8d. A portion of the first contact portion 8e that directly contacts the lateral wall 2d is made of, for example, resin or rubber. By adjusting the screwing amount of the first screw portion 8d and pressing the first contact portion 8e against the lateral wall 2d, the first partition plate 8 is in a state of being stretched in the second direction SD between the pair of lateral walls 2d, It is fixed inside the tank 2 .

The first sealing portion 8c has an elastically deformable plate shape. The first sealing portion 8c is made of rubber, resin, or the like, for example. The first sealing portion 8c has a rectangular plate shape extending in the vertical direction, and a pair of plate surfaces face the upstream side and the downstream side in the first direction FD. The vertical length of the first sealing portion 8c is substantially the same as the vertical length of the first main body portion 8a.

The first sealing portion 8c is fixed to the plate surface of the first body portion 8a facing the upstream side in the first direction FD. Specifically, of the both ends of the first sealing portion 8c in the second direction SD, the inner (center side) end in the second direction SD is fixed to the first main body portion 8a by a screw member or the like. . By being elastically deformed, the first sealing portion 8c curves and extends toward the upstream side in the first direction FD as it goes from the inner end portion in the second direction SD toward the outer side in the second direction SD. The outer end portion of the first sealing portion 8c in the second direction SD is in close contact with the lateral wall 2d while being elastically deformed. Thereby, the first sealing portion 8c seals the gap between the end portion of the first body portion 8a in the second direction SD and the lateral wall 2d so that the liquid D passing through the gap flows in the first direction FD. block or suppress
A plurality (a pair) of first sealing portions 8c are provided. The plurality of first sealing portions 8c are provided at both ends of the first main body portion 8a in the second direction SD.

As shown in FIGS. 1 and 2, the second partition plate 9 is arranged upstream of at least one of the plurality of bubble generating nozzles 110 and downstream of the upstream vertical wall 2b in the first direction FD. be. In the present embodiment, the second partition plate 9 includes the bubble generation nozzles 110 (four bubble generation nozzles 110) located at the upstream end in the first direction FD among the plurality (24) of the bubble generation nozzles 110. The bubble generating nozzles 110 other than the bubble generating nozzles 110 (20 bubble generating nozzles 110) are arranged upstream in the first direction FD. The second partition plate 9 is arranged apart from the first partition plate 8 on the upstream side in the first direction FD. The second partition plate 9 has a plate shape extending in a direction perpendicular to the first direction FD. In this embodiment, the second partition plate 9 has a rectangular plate shape.

The upper end of the second partition plate 9 protrudes upward from the liquid surface LS. A portion of the second partition plate 9 other than the upper end portion is placed in the liquid D in the tank 2 . The floating oil F floating on the liquid surface LS on the downstream side of the second partition plate 9 in the first direction FD from the liquid D is partitioned by the second partition plate 9, so that the floating oil F floats in the first direction FD of the second partition plate 9. does not flow to the upstream side of
The second partition plate 9 is arranged such that the lower end of the second partition plate 9 is separated upward from the bottom wall 2a. The lower end of the second partition plate 9 is located above the lower end of the first partition plate 8 .

The attachment position of the second partition plate 9 can be adjusted in at least one of the first direction FD and the vertical direction within the tank 2 . In this embodiment, the attachment position of the second partition plate 9 in the tank 2 is adjustable in the first direction FD, and the attachment position is also adjustable in the vertical direction. That is, the position of the second partition plate 9 can be adjusted in the tank 2 in the first direction FD, the vertical direction, and a direction (diagonal direction) combining the first direction FD and the vertical direction.

As shown in FIG. 4, the second partition plate 9 includes a plate-like second main body portion 9a and an end portion of the second main body portion 9a in the second direction SD so as to extend and contract in the second direction SD. It has a second stretchable portion 9b that contacts the lateral wall 2d, and a second sealing portion 9c that seals a gap between the lateral wall 2d and the end of the second body portion 9a in the second direction SD.

The second body portion 9a has a rectangular plate shape extending in a direction perpendicular to the first direction FD. The length of the second body portion 9a in the second direction SD is smaller than the distance in the second direction SD between the pair of lateral walls 2d. The vertical length of the portion of the second main body 9 a placed in the liquid D is smaller than the vertical distance between the bottom wall 2 a and the liquid surface LS, that is, the depth of the liquid D in the tank 2 .

In this embodiment, the second stretchable portion 9b is provided by screwing to the end of the second body portion 9a in the second direction SD. By adjusting the amount of screwing of the second elastic portion 9b into the second main body portion 9a in the second direction SD, the amount of protrusion of the second elastic portion 9b from the second main body portion 9a in the second direction SD is adjusted. It is possible.
The second elastic part 9b is, for example, a rubber base adjuster. In this embodiment, the second elastic portion 9b and the first elastic portion 8b are common parts.

A plurality of second elastic portions 9b are provided. The plurality of second stretchable portions 9b are arranged at intervals in the vertical direction at the ends of the second body portion 9a in the second direction SD, and are arranged at equal pitches in the present embodiment. The second stretchable portions 9b are provided at both ends of the second main body portion 9a in the second direction SD. That is, the plurality of second stretchable portions 9b protrude outward in the second direction SD from both end portions of the second body portion 9a in the second direction SD.

The second stretchable portion 9b has a second threaded portion 9d screwed to the second body portion 9a, and a second contact portion 9e fixed to the second threaded portion 9d and in contact with the lateral wall 2d.
The outer diameter of the second contact portion 9e is larger than the outer diameter of the second threaded portion 9d. A portion of the second contact portion 9e that directly contacts the lateral wall 2d is made of, for example, resin or rubber. By adjusting the screwing amount of the second screw portion 9d and pressing the second contact portion 9e against the lateral wall 2d, the second partition plate 9 is in a state of being stretched in the second direction SD between the pair of lateral walls 2d, It is fixed inside the tank 2 .

The second sealing portion 9c has a plate shape that can be elastically deformed. The second sealing portion 9c is made of rubber, resin, or the like, for example. The second sealing portion 9c has a rectangular plate shape extending in the vertical direction, and a pair of plate surfaces face the upstream side and the downstream side in the first direction FD. The vertical length of the second sealing portion 9c is substantially the same as the vertical length of the second body portion 9a.

The second sealing portion 9c is fixed to the plate surface of the second body portion 9a facing the upstream side in the first direction FD. Specifically, of the two end portions of the second sealing portion 9c in the second direction SD, the inner (center side) end portion in the second direction SD is fixed to the second main body portion 9a by a screw member or the like. . By being elastically deformed, the second sealing portion 9c curves and extends toward the upstream side in the first direction FD as it goes from the inner end portion in the second direction SD toward the outer side in the second direction SD. The outer end portion of the second sealing portion 9c in the second direction SD contacts the lateral wall 2d closely while being elastically deformed. Thereby, the second sealing portion 9c seals the gap between the end portion of the second body portion 9a in the second direction SD and the lateral wall 2d so that the liquid D passing through the gap flows in the first direction FD. block or suppress
A plurality (a pair) of second sealing portions 9c are provided. The plurality of second sealing portions 9c are provided at both ends of the second main body portion 9a in the second direction SD.

As shown in FIGS. 1 and 2, the floating oil recovery device 10 is floated on the liquid surface LS of the liquid D in the tank 2 to recover the floating oil F. As shown in FIGS.
As shown in FIGS. 8 and 9, the floating oil recovery device 10 includes a suction pipe portion 12, a tube 18, a float portion 13, a nozzle portion 14, a suction source 17, and a floating oil recovery tank 19. Prepare.

The suction pipe portion 12 is connected to a nozzle portion 14 that sucks the floating oil F. As shown in FIG. The suction pipe portion 12 is provided between the nozzle portion 14 and a suction source 17 such as a suction pump. The suction pipe portion 12 constitutes a part of a flow path (pipeline) of a suction pipe that sucks the floating oil F. As shown in FIG. The suction tube portion 12 is a portion of the suction tube (whole) located near the liquid surface LS. The float portion 13 floats on the liquid surface LS. The float portion 13 supports the suction tube portion 12 and the nozzle portion 14 . The nozzle part 14 is arranged on the liquid surface LS. When the water level of the liquid D (vertical position of the liquid surface LS) fluctuates, the float portion 13 moves vertically according to the water level. The float portion 13 arranges the nozzle portion 14 and the suction pipe portion 12 near the liquid surface LS regardless of the water level of the liquid D (fluctuations).

In the following description, the vertical direction is shown as the Z direction in FIGS. 8 to 14 showing the floating oil recovery device 10 of this embodiment.
Further, among the horizontal directions, the direction in which the nozzle portion 14 extends is referred to as the front-rear direction and indicated as the X direction. 8 is called the front side (+X side), and the left side of the paper is called the rear side (−X side). In the front-rear direction, the direction away from the suction tube portion 12 is called the outer side, and the direction closer to the suction tube portion 12 is called the inner side. That is, in the front-rear direction, the direction from the suction pipe portion 12 to the tip of the nozzle portion 14 is called the outside, and the direction from the tip of the nozzle portion 14 to the suction pipe portion 12 is called the inside.

A direction orthogonal to the up-down direction and the front-rear direction is called the width direction, and indicated as the Y direction. The width direction is a horizontal direction perpendicular to the front-rear direction. In the width direction, the upper side of the paper surface of FIG. 8 is called the left side (+Y side), and the lower side of the paper surface is called the right side (−Y side).

The vertical direction (upper, lower), the front-rear direction (front, rear, inner, outer), and the width direction (left, right) described above are simply names for explaining the relative positional relationship of each part. The layout relationships and the like are not limited to the layout relationships and the like indicated by these names.

The suction tube part 12 is arranged above and on the liquid surface LS. The suction pipe portion 12 has a portion (main pipe 21) extending vertically from above the bath 2 toward the liquid surface LS and a portion (branch pipe 22) extending horizontally along the liquid surface LS. In the example of this embodiment, the suction tube portion 12 is a tube with a circular cross section (circular tube, round pipe). The suction tube portion 12 is made of, for example, a synthetic resin such as impact-resistant rigid polyvinyl chloride (HI-PVC) or vinyl chloride.

A flexible tube 18 is connected to the upper end of the suction tube portion 12 . The tube 18 is tubular. The tube 18 is directly or indirectly connected to the suction source 17 and the floating oil recovery tank 19 . That is, the suction pipe portion 12 is connected to the suction source 17 and the floating oil recovery tank 19 via the tube 18 . The tube 18 is flexible and allows horizontal movement (flow) of the floating oil recovery device 10 on the liquid surface LS. Further, the tube 18 allows the floating oil recovery device 10 to move up and down according to the fluctuation of the water level of the liquid surface LS.

The suction pipe section 12 has a main pipe 21 and a plurality of branch pipes 22 .
The main pipe 21 is a portion of the suction pipe portion 12 that extends upward from the vicinity of the liquid surface LS. That is, the main pipe 21 is a portion of the suction pipe portion 12 that extends in the vertical direction. A tube 18 is connected to the upper end of the main pipe 21 . A lower end of the main pipe 21 is connected to the branch pipe 22 .

In the example of this embodiment, a pair of branch pipes 22 is provided. The branch pipe 22 is a portion of the suction pipe portion 12 that branches off from the main pipe 21 in the vicinity of the liquid surface LS and extends in the horizontal direction (the width direction in this embodiment). The branch pipe 22 is arranged on the liquid surface LS and extends along the liquid surface LS. The branch pipe 22 is connected to the lower end of the main pipe 21 and communicates with the main pipe 21 . The pair of branch pipes 22 are arranged on both widthwise sides (left and right sides) of the main pipe 21 . A cap 23 is attached to the distal end (the end in the width direction) of the branch pipe 22 . The cap 23 closes the end in the width direction of the conduit of the branch pipe 22 .

As shown in FIG. 10, the outer peripheral surface of the branch pipe 22 is provided with a suction hole 22h. The suction hole 22h is a through hole penetrating the peripheral wall of the branch pipe 22, and has a slit shape in the example of the present embodiment. 22 h of suction holes are arrange|positioned among the surrounding walls of the branch pipe 22 in the part (upper part) located above the central axis C of the branch pipe 22, and extend in a horizontal direction (width direction in this embodiment). 22 h of suction holes are provided in the upper part of the branch pipe 22 at intervals in the front-back direction mutually (one pair in the example of this embodiment). The central axis C of the branch pipe 22 and the suction hole 22h are located above the liquid surface LS.

As shown in FIG. 10, when viewed along the central axis C of the branch pipe 22 (viewed from the direction of the central axis C), the hole center line HL of the suction hole 22h is inclined with respect to the vertical axis VA passing through the central axis C. The angle θ1 is, for example, 35-70°. The angle θ1 is preferably 45-60°. In the illustrated example, the angles θ1 of the pair of suction holes 22h provided in one branch pipe 22 are the same. However, not limited to this, the angles θ1 of the pair of suction holes 22h may be different from each other.
A nozzle portion 14 is connected to the branch pipe 22 so as to cover the suction hole 22h. The nozzle portion 14 surrounds the suction hole 22h in the vertical direction, the front-rear direction, and the width direction.

As shown in FIGS. 8 and 9, the float portion 13 is connected to the main pipe 21 of the suction pipe portion 12 and floats on the liquid surface LS of the liquid D. As shown in FIGS. In other words, the suction tube portion 12 floats on the liquid surface LS by being supported by the float portion 13 .
A plurality of float portions 13 are provided. In the example of this embodiment, four float portions 13 are provided and connected to the suction tube portion 12 respectively. The plurality of float portions 13 are arranged on both sides (front side, rear side) in the front-rear direction and on both sides (left side, right side) in the width direction with the main pipe 21 as the center. In a plan view (top view) of the floating oil recovery device 10 shown in FIG. 8, the four float portions 13 are arranged around the main pipe 21 at regular intervals (90° intervals).

The float portion 13 has a float body 31 that floats on the liquid surface LS and a float support portion 32 that supports the float body 31 .
The float body 31 is made of resin, for example, and has a lower specific gravity than the liquid D. The float body 31 is made of foamed resin such as polystyrene foam. The float body 31 may be, for example, a hollow structure having an outer shell made of resin, or may be made of wood or the like. In the example of this embodiment, the float body 31 is barrel-shaped or rugby ball-shaped. The float bodies 31 arranged on the front and rear sides of the main pipe 21 extend in the width direction. The float bodies 31 arranged on the left and right sides of the main pipe 21 extend in the front-rear direction. The float body 31 has a center hole 31h that penetrates the float body 31 in the horizontal direction (longitudinal direction of the float body 31).

The float support portion 32 is connected to the float body 31 . The float support 32 has a horizontally extending shaft 33 that passes through the float body 31 . The shaft 33 is inserted through the center hole 31h of the float body 31 and protrudes from both ends of the float body 31 in the longitudinal direction. The float support portion 32 connects the float body 31 and the main pipe 21 .

Specifically, the float support portion 32 is formed with a through hole penetrating the float support portion 32 in the vertical direction, and the main pipe 21 is inserted into the through hole. In the main pipe 21, an upper stopper 35 is arranged above the portion of the float support portion 32 where the through hole is formed, and an upper stopper 35 is arranged below the portion of the float support portion 32 where the through hole is formed. A lower stopper 36 is provided.

The upper stopper 35 has a circular ring shape, and the main pipe 21 is inserted into the upper stopper 35 . The upper stopper 35 is fixed to the main pipe 21 by tightening the fixing screw of the upper stopper 35 . The upper stopper 35 contacts the float support portion 32 from above. The upper stopper 35 restricts upward movement of the float support portion 32 with respect to the main pipe 21 . By loosening the fixing screw of the upper stopper 35 to release the fixed state to the main pipe 21 , the float support portion 32 is allowed to move upward with respect to the main pipe 21 .

The lower stopper 36 has a circular ring shape, and the main pipe 21 is inserted into the lower stopper 36 . The lower stopper 36 is fixed to the main pipe 21 by tightening the fixing screw of the lower stopper 36 . The lower stopper 36 contacts the float support portion 32 from below. The lower stopper 36 restricts downward movement of the float support portion 32 with respect to the main pipe 21 . By loosening the fixing screw of the lower stopper 36 to release the fixed state to the main pipe 21 , the float support portion 32 is allowed to move downward with respect to the main pipe 21 .
In this manner, the float support portion 32 is fixed to the portion (main pipe 21) extending in the vertical direction of the suction tube portion 12 so that the position in the vertical direction can be adjusted.

The nozzle part 14 is floated on the liquid surface LS of the liquid D and sucks the floating oil F. A plurality of nozzle portions 14 are provided. The nozzle portion 14 is provided on each of the plurality of branch pipes 22 . In the example of this embodiment, the number of nozzle portions 14 (two) is the same as the number of branch pipes 22 (two). One nozzle portion 14 is provided for each pair of branch pipes 22 . The pair of nozzle portions 14 are arranged apart from each other in the horizontal direction (the width direction in this embodiment). In this embodiment, the nozzle part 14 is made of stainless steel such as SUS304, for example.

As shown in FIG. 10 , the nozzle portion 14 has an attachment portion 41 fixed to the branch pipe 22 and a pair of suction nozzles 42 extending in the front-rear direction from the attachment portion 41 .
The mounting portion 41 is plate-shaped. The attachment portion 41 covers a portion of the branch pipe 22 in the width direction from above. The mounting portion 41 has an arch shape that straddles the upper portion of the branch pipe 22 in the front-rear direction, and supports the pair of suction nozzles 42 on the front and rear sides of the branch pipe 22 .

The mounting portion 41 has a fixed wall portion 41a and a pair of inclined wall portions 41b connected to both ends of the fixed wall portion 41a in the front-rear direction.
The fixed wall portion 41a extends in a direction perpendicular to the vertical direction (horizontal direction). The fixed wall portion 41a is fixed to the upper end portion of the outer peripheral surface of the branch pipe 22 by screwing or the like.

The inclined wall portion 41b is arranged to face the suction hole 22h of the branch pipe 22 with a gap therebetween. The inclined wall portion 41b extends downward from the connecting portion with the fixed wall portion 41a while extending outward in the front-rear direction. The inclined wall portion 41b is arranged with a distance of, for example, about 5 to 15 mm from the suction hole 22h. This distance is preferably between 8 and 12 mm. As shown in FIG. 10, when viewed from the direction of the central axis C of the branch pipe 22 (or in a cross-sectional view perpendicular to the central axis C), the distance between the inclined wall portion 41b and the suction hole 22h is smaller than the hole width (opening width). However, not limited to this, the distance between the inclined wall portion 41b and the suction hole 22h may be greater than or equal to the hole width of the suction hole 22h.

The suction nozzle 42 has a cylindrical shape extending in the horizontal direction. In the example of this embodiment, the suction nozzle 42 has a rectangular tube shape extending in the front-rear direction. The suction nozzle 42 has a flat square tube shape. The cross section of the suction nozzle 42 perpendicular to the front-rear direction has a rectangular shape. The shape of the cross-section of the suction nozzle 42 perpendicular to the front-rear direction is a quadrangular shape in which the length in the width direction is longer than the length in the up-down direction.

The suction nozzle 42 is arranged along the liquid surface LS. The lower end of the suction nozzle 42 is positioned below the liquid surface LS, and the portion other than the lower end (the portion positioned above the lower end) is positioned above the liquid surface LS. That is, the nozzle part 14 has a portion positioned below the liquid surface LS and a portion positioned above the liquid surface LS. The tip of the suction nozzle 42 (outer end in the front-rear direction) opens to the liquid surface LS. The suction nozzle 42 has an opening at the tip of the suction nozzle 42 . The lower end of the opening of the suction nozzle 42 is immersed under the liquid surface LS, and the portion other than the lower end is exposed above the liquid surface LS. Floating oil F on the liquid surface LS and liquid such as water can enter the suction nozzle 42 through the opening.

The suction nozzle 42 sends the floating oil F toward the branch pipe 22 through the inside of the suction nozzle 42 . The floating oil F passes through the internal space of the suction nozzle 42 and is sucked into the suction holes 22 h provided in the peripheral wall of the branch pipe 22 . The internal space of the suction nozzle 42 has a flat shape in which the vertical dimension is smaller than the width dimension and the longitudinal dimension. The height of the internal space of the suction nozzle 42 decreases toward the side of the branch pipe 22 (inner side in the front-rear direction) from the opening positioned at the end of the suction nozzle 42 (outside in the front-rear direction). The opening area of the cross section perpendicular to the front-rear direction of the suction nozzle 42 decreases from the tip (opening) of the suction nozzle 42 toward the branch pipe 22 side.

The suction nozzle 42 has a top wall portion 43 , a side wall portion 44 and a bottom wall portion 45 . That is, the nozzle portion 14 has a top wall portion 43 , a side wall portion 44 and a bottom wall portion 45 .
The ceiling wall portion 43 is a substantially flat plate-shaped portion that is connected to the outer end portion of the mounting portion 41 in the front-rear direction and extends from this end portion in the front-rear direction. The ceiling wall portion 43 extends substantially horizontally. An end portion of the top wall portion 43 on the tip side (outside in the front-rear direction) extends with a slight upward slant toward the tip side. The ceiling wall portion 43 is arranged above the liquid surface LS. The lower surface of the ceiling wall portion 43 faces the liquid surface LS from above with a gap therebetween. The vertical distance between the lower surface of the ceiling wall portion 43 and the liquid surface LS is, for example, 10 to 30 mm. This distance is preferably between 15 and 25 mm.

A pair of side wall portions 44 are provided so as to be connected to both ends of the ceiling wall portion 43 in the width direction. The side wall portion 44 has a flat plate shape extending in a direction perpendicular to the width direction. The side wall portions 44 extend downward from both widthwise end portions of the ceiling wall portion 43 . A lower end portion of the side wall portion 44 is immersed in the liquid D. As shown in FIG.

The bottom wall portion 45 is a flat plate-shaped portion bridged between the pair of side wall portions 44 . Both ends of the bottom wall portion 45 in the width direction are connected to the pair of side wall portions 44 . The bottom wall portion 45 is fixed to the pair of side wall portions 44 . An inner end portion of the bottom wall portion 45 in the front-rear direction is connected to (contacts with) the peripheral wall of the branch pipe 22 . In addition, the inner end portion of the bottom wall portion 45 in the front-rear direction may be arranged with a slight gap from the peripheral wall of the branch pipe 22 . An inner end portion of the bottom wall portion 45 in the front-rear direction is positioned below the suction hole 22h of the branch pipe 22 and is arranged close to the suction hole 22h. That is, the inner end portion of the bottom wall portion 45 in the front-rear direction is located directly below the suction hole 22h and is arranged adjacent to the suction hole 22h.

The bottom wall portion 45 slopes downward and extends away from the branch pipe 22 in the front-rear direction (that is, as it extends outward in the front-rear direction). Of the bottom wall portion 45 , the inner (basal end) end portion in the front-rear direction is located above the liquid surface LS. Of the bottom wall portion 45 , the outer (front end side) end portion in the front-rear direction is located below the liquid surface LS. In the example of the present embodiment, the tip-side end of the bottom wall portion 45 is positioned at the tip-side end of the suction nozzle 42 and constitutes a part (lower end) of the opening of the suction nozzle 42 . .
That is, the nozzle portion 14 has a bottom wall portion 45, and the bottom wall portion 45 extends at an angle downward as it separates from the suction tube portion 12 in the horizontal direction (the front-rear direction in this embodiment). It is inserted into the surface LS. In this manner, since the bottom wall portion 45 is inserted obliquely with respect to the liquid surface LS, the floating oil F floating on the liquid surface LS runs on the bottom wall portion 45 .

The angle θ2 at which the bottom wall portion 45 is inclined with respect to the liquid surface LS (the angle of inclination of the bottom wall portion 45 with respect to the horizontal direction) is, for example, 10 to 25°. The angle θ2 is preferably 15-20°.
The vertical distance between the bottom wall portion 45 and the top wall portion 43 gradually decreases inward in the longitudinal direction from the opening located at the outer end in the longitudinal direction of the suction nozzle 42 .

In FIG. 9, the suction source 17 and the floating oil recovery tank 19 are installed outside the tank 2 in which the liquid D is stored. The suction source 17 is connected to the suction tube portion 12 via the tube 18 . The suction source 17 sucks the floating oil F on the liquid surface LS from the nozzle portion 14 through the suction pipe portion 12 and the tube 18 . The floating oil F sucked from the nozzle portion 14 is recovered in the floating oil recovery tank 19 through the suction pipe portion 12 and the tube 18 .

Specifically, in the floating oil recovery apparatus 10, when the suction source 17 such as a suction pump is operated, the internal space of the suction nozzle 42 in the nozzle section 14 connected to the suction source 17 becomes negative pressure, and the suction nozzle 42 The liquid D (mainly floating oil F, the same applies hereinafter) near the liquid surface LS and the outside air are sucked from the opening of .
The floating oil recovery device 10 sucks the liquid D and outside air into the suction nozzle 42 and introduces them into the branch pipe 22 (suction pipe portion 12). That is, the liquid D moves diagonally upward along the slope of the bottom wall portion 45 within the suction nozzle 42 by the fluid suction force (air suction force) of the suction source 17, and enters the branch pipe 22 through the suction hole 22h. be drawn in.

As shown in FIGS. 1 and 2, the post-process liquid feeding pipe 7 is a pipe for feeding the liquid D in the tank 2 to post-process equipment (band tank). The post-process liquid-feeding pipe 7 feeds the liquid D at the bottom of the tank 2 located in the first direction FD relative to the first partition plate 8 in the tank 2 to equipment for the post-process.

According to the floating oil tank 1 of the present embodiment described above, the bubbles released from the bubble generating nozzle 110 into the liquid D rise, thereby generating an upward flow in the liquid D, and the oil content in the liquid D rises along with the bubbles. Float to surface LS. As a result, separation of the oil and water in the liquid D is promoted, and the floating oil F can be efficiently recovered by the floating oil recovery device 10 . Further, even when the length of the tank 2 (the tank length in the horizontal direction) is short, the floating oil F can be efficiently floated on the liquid surface LS and recovered. Therefore, the floating oil tank 1 can be configured compactly, and space can be saved. For example, even when the installation space of the facility is limited, the floating oil tank 1 can be easily installed.

Further, in this embodiment, the flow of the liquid D in the tank 2 can be guided by the guide means 4 arranged in the tank 2 . Specifically, the guide means 4 guides the flow of the liquid D that rises together with the air bubbles, so that the floating oil F can be efficiently collected in the vicinity of the floating oil recovery device 10 . Further, the guide means 4 prevents the flow of the liquid D (downward flow) flowing into the tank 2 from the preceding process equipment and the flow (upward flow) of the liquid D rising together with the air bubbles in the tank 2 from interfering with each other. can.

In addition, in the present embodiment, the first partition plate 8 is arranged downstream of the bubble generating nozzle 110 and upstream of the floating oil recovery device 10 in the first direction FD to separate the bubble generating nozzle 110 and the floating oil recovery device 10 from each other. partition. Therefore, on the upstream side of the first partition plate 8 (on the right side in FIG. 1), the flow of the liquid D rising together with the air bubbles is guided by the first partition plate 8, and the floating oil F tends to rise quickly to the liquid surface LS. Become. That is, the floating oil F reaches the liquid surface LS quickly while the oil in the liquid D is suppressed from flowing in the first direction FD. The floating oil F floating on the liquid surface LS flows downstream in the first direction FD (left side in FIG. 1) between the upper end of the first partition plate 8 and the liquid surface LS, that is, in the vicinity of the liquid surface LS. , and efficiently collected in the vicinity of the floating oil recovery device 10 . As a result, the efficiency of collecting the floating oil F is further enhanced. Moreover, even if the length of the tank 2 in the first direction FD is short, the floating oil F can be efficiently floated to the liquid surface LS and recovered, and the floating oil tank 1 can be configured more compactly.

Further, in the present embodiment, the mounting position of the first partition plate 8 can be adjusted to at least one of the downstream side in the first direction FD, the upstream side, and the vertical direction within the tank 2 .
In this case, the mounting position of the first partition plate 8 in the tank 2 can be adjusted according to the degree of contamination (oil content) of the liquid D, for example, so that the floating oil F collection efficiency can be enhanced.

Further, in the present embodiment, the first partition plate 8 protrudes from the plate-like first main body portion 8a and the end portion of the first main body portion 8a in the second direction SD so as to be expandable and contractable in the second direction SD, and the lateral wall and a first stretchable portion 8b that contacts 2d.
In this case, by increasing or decreasing the amount of protrusion of the first elastic portion 8b that protrudes in the second direction SD from the first body portion 8a, the first elastic portion 8b can be pressed against the lateral wall 2d or separated from the lateral wall 2d. can be done. That is, the first partition plate 8 can be detachably fixed to the lateral wall 2d of the tank 2 by expanding and contracting the first elastic portion 8b. According to this configuration, the mounting position of the first partition plate 8 can be finely adjusted within the tank 2, and the recovery efficiency of the floating oil F can be further enhanced. Since it is not necessary to embed an anchor bolt or the like in the lateral wall 2d of the tank 2, the structure of the tank 2 can be simplified and the mounting position of the first partition plate 8 can be freely adjusted.

Further, in the present embodiment, the first partition plate 8 has the first sealing portion 8c that seals the gap between the end of the first body portion 8a in the second direction SD and the lateral wall 2d.
In this case, the first sealing portion 8c prevents the oil-containing liquid D from flowing in the first direction FD through the gap between the end of the first main body portion 8a in the second direction SD and the lateral wall 2d. Therefore, the floating oil F is stably floated on the liquid surface LS on the upstream side of the first partition plate 8, and the recovery efficiency of the floating oil F is enhanced.

Further, in the present embodiment, the second partition plate 9 is arranged upstream of at least one of the plurality of bubble generating nozzles 110 and downstream of the upstream vertical wall 2b in the first direction FD to generate at least one bubble. It partitions between the generation nozzle 110 and the upstream vertical wall 2b. Therefore, on the downstream side of the second partition plate 9, the flow of the liquid D rising together with the air bubbles is guided by the second partition plate 9, and the floating oil F tends to float to the liquid surface LS quickly. On the upstream side of the second partition plate 9, the oil-containing liquid D sent from the preceding process equipment of the floating oil tank 1 is allowed to flow into the tank 2 through the gap between the second partition plate 9 and the upstream vertical wall 2b. be done. That is, the second partition plate 9 guides the rise of the liquid D on the downstream side of the second partition plate 9 and guides the inflow (fall) of the liquid D on the upstream side of the second partition plate 9 . The second partition plate 9 can suppress interference between the flow of the liquid D flowing into the tank 2 from the equipment of the preceding process and the flow of the liquid D rising together with the air bubbles in the tank 2 . Thereby, the collection efficiency of the floating oil F can be improved.

Further, in the present embodiment, the second partition plate 9 can be attached to at least one of the downstream side in the first direction FD, the upstream side, and the vertical direction within the bath 2 .
In this case, the attachment position of the second partition plate 9 in the tank 2 is adjusted according to, for example, the degree of contamination (oil content) of the liquid D and the amount of inflow into the tank 2 from the facilities of the preceding process. , the recovery efficiency of the floating oil F can be enhanced.

Further, in the present embodiment, the second partition plate 9 is provided so as to extend and contract in the second direction SD from the plate-like second main body portion 9a and the end portion of the second main body portion 9a in the second direction SD. and a second stretchable portion 9b that contacts 2d.
In this case, by increasing or decreasing the amount of projection of the second stretchable portion 9b that projects in the second direction SD from the second body portion 9a, the second stretchable portion 9b can be pressed against the lateral wall 2d or separated from the lateral wall 2d. can be done. That is, the second partition plate 9 can be detachably fixed to the lateral wall 2d of the tank 2 by expanding and contracting the second elastic portion 9b. According to this configuration, the mounting position of the second partition plate 9 can be finely adjusted within the tank 2, and the recovery efficiency of the floating oil F can be further enhanced. Since it is not necessary to embed an anchor bolt or the like in the lateral wall 2d of the tank 2, the structure of the tank 2 can be simplified and the mounting position of the second partition plate 9 can be freely adjusted.

Further, in the present embodiment, the second partition plate 9 has the second sealing portion 9c that seals the gap between the end of the second body portion 9a in the second direction SD and the lateral wall 2d.
In this case, the second sealing portion 9c prevents the oil-containing liquid D from flowing in the first direction FD through the gap between the end of the second body portion 9a in the second direction SD and the lateral wall 2d. Therefore, interference between the liquid D flowing on the upstream side of the second partition plate 9 and the liquid D flowing on the downstream side is further suppressed, and the recovery efficiency of the floating oil F is enhanced.

Further, in the present embodiment, the plurality of bubble generating nozzles 110 spaced apart from each other in the first direction FD and the second direction SD can efficiently float the oil in the liquid D to the liquid surface LS. In particular, in the example of the present embodiment, since the plurality of bubble generating nozzles 110 are arranged in the first direction FD and the second direction SD at equal pitches, the above effect becomes more remarkable.

Further, in this embodiment, the bubble generating nozzle 110 emits air bubbles upward in the liquid D. As shown in FIG.
In this case, the bubbles easily rise smoothly to the liquid surface LS, and the oil content in the liquid D can be efficiently floated to the liquid surface LS.

Further, in the present embodiment, since the bubble generating nozzle 110 emits microbubbles as air bubbles into the liquid D, the action (function) of the microbubbles efficiently separates the oil content in the liquid D from water or the like, thereby separating the liquid. Float to surface LS.

Further, in the present embodiment, as shown in FIG. 6, the microbubble generation channel portion 132 of the bubble generation nozzle 110 has an enlarged diameter channel portion 132a and a reduced diameter channel portion 132b. Therefore, the liquid D in the bubble generation nozzle 110 flows through the microbubble generation channel portion 132 from the enlarged diameter channel portion 132a to the reduced diameter channel portion 132b, thereby changing the pressure of the liquid D in the channel 115. Microbubbles are generated in the liquid D due to centrifugal force acting on the liquid D.

According to the bubble generating nozzle 110 having the above configuration, it is possible to generate microbubbles while simplifying the structure without forming a helical flow path as in the conventional structure disclosed in Japanese Patent No. 6312768, for example. . Therefore, manufacturing of the bubble generating nozzle 110 is easy. Moreover, in the bubble generating nozzle 110 having the above configuration, it is easy to reduce the total length in the axial direction, in particular, compared to the conventional structure. Therefore, the outer shape of the bubble generating nozzle 110 can be kept compact.

Further, in the present embodiment, the microbubble generation channel portion 132 has an annular shape extending in the circumferential direction around the central axis A. As shown in FIG.
In this case, the structure of the microbubble generating channel portion 132 can be simplified, and the manufacturing of the bubble generating nozzle 110 becomes easier.

Further, in the present embodiment, the diameter-enlarged flow passage portion 132a is formed by the diameter-enlarged inner peripheral surface portion 120 and the diameter-enlarged outer peripheral surface portion 124, and the diameter-enlarged flow passage portion 132b is formed by the diameter-enlarged inner peripheral surface portion 122 and the diameter-enlarged outer peripheral surface portion. 125.
In this case, the liquid D in the bubble generation nozzle 110 flows from the enlarged diameter channel portion 132a to the reduced diameter channel portion 132b, thereby stably exerting pressure change and centrifugal force on the liquid D in the channel 115. , and microbubbles are generated more stably in the liquid D.

Further, in the present embodiment, the enlarged diameter inner peripheral surface portion 120 has the first enlarged diameter uneven portion 121 in which uneven shapes are repeated along the axial direction, and the enlarged diameter outer peripheral surface portion 124 has the uneven shape along the axial direction. It has a second enlarged diameter uneven portion 126 that is repeated.
That is, since the enlarged diameter inner peripheral surface portion 120 and the enlarged diameter outer peripheral surface portion 124 forming the enlarged diameter flow passage portion 132a each have a portion in which uneven shapes are repeated in the axial direction, the liquid D flowing inside the enlarged diameter flow passage portion 132a In addition, the change in pressure and the centrifugal force can be made to act more easily. In addition, the cross-sectional shape and cross-sectional area of the diameter-enlarged channel portion 132a change at each position in the axial direction. For this reason, microbubbles tend to be more stably generated in the liquid D flowing through the diameter-enlarged channel portion 132a.

Further, in the present embodiment, the convex portion 121a of the first diameter-enlarged uneven portion 121 and the convex portion 126a of the second diameter-enlarged uneven portion 126 are arranged to face each other, and the concave portion 121b of the first diameter-enlarged uneven portion 121 is arranged to face each other. , and the concave portion 126b of the second diameter-enlarged concave-convex portion 126 are arranged to face each other.
In this case, the cross-sectional shape and cross-sectional area of the enlarged-diameter channel portion 132a change more greatly at each position in the axial direction. Therefore, microbubbles are more stably generated in the liquid D flowing through the enlarged-diameter channel portion 132a.

Further, in this embodiment, the diameter-reduced inner peripheral surface portion 122 has the first diameter-reduced uneven portion 123 in which uneven shapes are repeated along the axial direction, and the diameter-reduced outer peripheral surface portion 125 has the uneven shape along the axial direction. It has a second reduced-diameter uneven portion 127 that is repeated.
That is, since the diameter-reduced inner peripheral surface portion 122 and the diameter-reduced outer peripheral surface portion 125 forming the diameter-reduced flow passage portion 132b each have a portion in which uneven shapes are repeated in the axial direction, the liquid D flowing inside the diameter-reduced flow passage portion 132b In addition, the change in pressure and the centrifugal force can be made to act more easily. In addition, the cross-sectional shape and cross-sectional area of the diameter-reduced flow passage portion 132b change at each position in the axial direction. Therefore, microbubbles are more likely to stably occur in the liquid D flowing through the diameter-reduced channel portion 132b.

Further, in the present embodiment, the convex portion 123a of the first diameter-reduced uneven portion 123 and the convex portion 127a of the second diameter-reduced uneven portion 127 are arranged to face each other, and the concave portion 123b of the first diameter-reduced uneven portion 123 is arranged to face each other. , and the recessed portion 127b of the second diameter-reduced uneven portion 127 are arranged to face each other.
In this case, the cross-sectional shape and cross-sectional area of the diameter-reduced flow passage portion 132b change more greatly at each position in the axial direction. Therefore, microbubbles are more stably generated in the liquid D flowing through the diameter-reduced channel portion 132b.

Further, in the present embodiment, the plurality of connecting flow passage portions 130a of the inflow-side flow passage portion 130 are arranged in the circumferential direction around the central axis A at equal pitches.
In this case, the liquid D flows into the microbubble generating channel portion 132 from the plurality of connection channel portions 130 a of the inflow-side channel portion 130 while being evenly dispersed in the circumferential direction. Therefore, the microbubbles can be uniformly generated in the liquid D flowing through the microbubble generating channel portion 132 in the circumferential direction.

In addition, in the present embodiment, the plurality of ejection passage portions 131a of the outflow side passage portion 131 are arranged in the circumferential direction around the central axis A at equal pitches.
In this case, the liquid D flows from the microbubble generating channel portion 132 into the plurality of ejection channel portions 131 a of the outflow channel portion 131 while being evenly dispersed in the circumferential direction. Therefore, the liquid D containing microbubbles can be evenly ejected from the plurality of ejection channel portions 131a in the circumferential direction.

Further, in this embodiment, as shown in FIG. 10, the bottom wall portion 45 of the nozzle portion 14 of the floating oil recovery device 10 extends at an angle downward as it moves away from the suction pipe portion 12 in the horizontal direction, It is inserted diagonally with respect to the liquid surface LS. Therefore, when the floating oil F and the liquid D such as water that run on the bottom wall portion 45 are sucked obliquely upward along the slope of the bottom wall portion 45, the water on the bottom wall portion 45 is , the inclination of the bottom wall portion 45 facilitates return to the liquid surface LS. Further, the floating oil F on the bottom wall portion 45 can be easily lifted obliquely upward along the inclination of the bottom wall portion 45 . As a result, the amount (ratio) of water or the like recovered can be reduced, and the recovery efficiency of the floating oil F can be enhanced.

Specifically, since the floating oil F has a lower specific gravity than water or the like and is positioned above the water or the like, it easily rides on the bottom wall portion 45 . In addition, when the floating oil F runs on the bottom wall portion 45, it is less likely to flow diagonally downward due to gravity (more likely to remain on the bottom wall portion 45 than water or the like). The floating oil F is likely to be pulled up obliquely upward on the bottom wall portion 45 by the fluid suction force of the suction source 17 . Therefore, the floating oil F sucked into the branch pipe 22 (collected amount) increases.
On the other hand, since water or the like has a higher specific gravity than the floating oil F and is positioned below the floating oil F, it is difficult to run on the bottom wall portion 45 . Moreover, even if water or the like runs on the bottom wall portion 45, it is likely to flow diagonally downward due to gravity (it is difficult to stay on the bottom wall portion 45). Water or the like is less likely to be pulled up obliquely upward on the bottom wall portion 45 depending on the fluid suction force of the suction source 17 . Therefore, the amount of water or the like sucked into the branch pipe 22 (collected amount) is reduced.
As described above, according to the present embodiment, the recovery efficiency of the floating oil F can be improved as compared with the conventional art.

Further, in this embodiment, since the angle θ1 is 35 to 70°, the following effects are obtained.
Since the angle θ1 is 35° or more, the distance between the inner end (base end) of the bottom wall portion 45 in the front-rear direction and the suction hole 22h can be reduced. Therefore, a strong fluid suction force can be applied to the floating oil F on the bottom wall portion 45 from the suction holes 22h.
Since the angle θ1 is 70° or less, it is possible to prevent the suction hole 22h from coming too close to the liquid surface LS. Therefore, water or the like is prevented from being directly sucked into the branch pipe 22 from the suction hole 22 h without passing over the bottom wall portion 45 .
In order to make the above effect more remarkable, the angle θ1 is preferably 45 to 60°.

Further, in this embodiment, since the angle θ2 is 10 to 25°, the following effects can be obtained.
Since the angle .theta.2 is 10.degree. That is, the effect of returning water or the like from the bottom wall portion 45 to the liquid surface LS can be stably obtained.
Since the angle θ2 is 25° or less, the fluid suction force of the suction source 17 facilitates pulling up the floating oil F obliquely upward from the bottom wall portion 45 . That is, the operation of sucking and recovering the floating oil F from the bottom wall portion 45 can be stably obtained.
In order to make the above effect more remarkable, the angle θ2 is preferably 15 to 20°.

In this embodiment, as shown in FIG. 9, the float support portion 32 of the float portion 13 is fixed to the portion (main pipe 21) extending in the vertical direction of the suction pipe portion 12 so that the position in the vertical direction can be adjusted. ing.
Thereby, the vertical relative position between the float portion 13 and the suction tube portion 12 can be adjusted, and the vertical position of the nozzle portion 14 with respect to the liquid surface LS can be adjusted. Therefore, the vertical position of the bottom wall portion 45 of the nozzle portion 14 with respect to the liquid surface LS can be maintained well, making it difficult to suck water or the like from the nozzle portion 14 and making it easy to suck the floating oil F, thereby recovering the floating oil F. Efficiency can be improved stably.

Next, modified examples (first to third modified examples) of the floating oil recovery device 10 provided in the floating oil tank 1 of the first embodiment will be described.

<First modification>
FIG. 11 is a side view showing a first modification of the nozzle portion 14 (suction nozzle 42) of the floating oil recovery device 10. As shown in FIG.
In this first modification, the suction nozzle 42 has a bottom wall portion 46 in addition to the top wall portion 43 , the side wall portion 44 and the bottom wall portion 45 . That is, the nozzle portion 14 has a plurality of bottom wall portions 45 and 46 . The plurality of bottom wall portions 45 and 46 are arranged adjacent to each other with a gap in the direction away from the suction tube portion 12 in the horizontal direction (the front-rear direction in this modified example).

In the illustrated example, the suction nozzle 42 has two bottom walls 45,46.
Of the two bottom wall portions 45 and 46 , the bottom wall portion 45 that connects (contacts) the peripheral wall of the branch pipe 22 is the first bottom wall portion 45 . The front-rear direction outer (distal side) end of the first bottom wall portion 45 is arranged on the front-rear direction inner side (base end side) than the front-rear direction outer end of the suction nozzle 42 . Other configurations of the first bottom wall portion 45 are the same as those of the bottom wall portion 45 of the first embodiment described above.

Of the two bottom wall portions 45 and 46 , the bottom wall portion 46 located outside the first bottom wall portion 45 in the front-rear direction is the second bottom wall portion 46 . The second bottom wall portion 46 is a plate-shaped portion that bridges between the pair of side wall portions 44 . Both ends of the second bottom wall portion 46 in the width direction are connected to the pair of side wall portions 44 . The inner end portion of the second bottom wall portion 46 in the front-rear direction is arranged away from the peripheral wall of the branch pipe 22 to the outer side in the front-rear direction. The inner end in the front-rear direction of the second bottom wall portion 46 is positioned above the outer end in the front-rear direction of the first bottom wall portion 45 . When viewed in the vertical direction, the front-rear inner end portion of the second bottom wall portion 46 and the front-rear outer end portion of the first bottom wall portion 45 overlap each other.

The second bottom wall portion 46 extends obliquely downward as it goes outward in the front-rear direction (as it moves away from the suction tube portion 12 in the horizontal direction) and is inserted into the liquid surface LS. An inner end portion of the second bottom wall portion 46 in the front-rear direction is positioned above the liquid surface LS. An outer end portion of the second bottom wall portion 46 in the front-rear direction is positioned below the liquid surface LS. In this modified example, the front-rear direction outer (tip end) end of the second bottom wall portion 46 is positioned at the front-rear direction outer end of the suction nozzle 42 .

The vertical distance between the second bottom wall portion 46 and the top wall portion 43 gradually decreases from the outer end in the front-rear direction of the suction nozzle 42 toward the inner side in the front-rear direction. Since the second bottom wall portion 46 is inserted obliquely with respect to the liquid surface LS, the floating oil F floating on the liquid surface LS is in a state of riding on the second bottom wall portion 46 .

The angle θ3 at which the second bottom wall portion 46 is inclined with respect to the liquid surface LS (the angle of inclination of the second bottom wall portion 46 with respect to the horizontal direction) is, for example, 10 to 25°. The angle θ3 is preferably 15-20°. In the illustrated example, the two bottom wall portions 45 and 46 of each suction nozzle 42 extend parallel to each other when viewed from the central axis C direction, and the angles θ2 and θ3 are the same.

According to the first modified example described above, the same effects as those of the above-described first embodiment can be obtained. In addition, since the nozzle portion 14 has a plurality of bottom wall portions 45 and 46, separation of the floating oil F from water or the like is promoted on the bottom wall portions 45 and 46, thereby improving the recovery efficiency of the floating oil F. can be done. That is, when the floating oil F, water, etc. are sucked toward the branch pipe 22 (suction pipe portion 12) while climbing over the plurality of bottom wall portions 45, 46, there is a gap between the plurality of bottom wall portions 45, 46. , water or the like is returned to the liquid surface LS. That is, the floating oil F climbs over the plurality of bottom wall portions 45 and 46 and is sucked into the branch pipe 22 , but water and the like move over the plurality of bottom wall portions 45 and 46 . It becomes easy to be returned to the liquid surface LS between them. Therefore, the recovery efficiency of the floating oil F is further enhanced.

Specifically, the liquid D sucked by the suction nozzle 42 is caused to climb over two slopes (bottom wall portions 45 and 46) before reaching the branch pipe 22 . At this time, the floating oil F, which has a small specific gravity, easily reaches the branch pipe 22, but water, which has a large specific gravity, cannot climb over the two slopes (bottom walls 45 and 46) and the liquid surface LS more likely to be returned to In other words, it becomes difficult for water or the like to be introduced into the branch pipe 22, and the recovery amount is reduced.
Therefore, the separation of the floating oil F and water or the like is further promoted, and the recovery efficiency of the floating oil F is enhanced.

Also, since the angle θ3 is 10 to 25°, the following effects can be obtained.
Since the angle θ3 is 10° or more, water or the like tends to flow diagonally downward from the second bottom wall portion 46 . That is, the action of returning water or the like from above the second bottom wall portion 46 to the liquid surface LS can be stably obtained.
Since the angle θ3 is 25° or less, the fluid suction force of the suction source 17 facilitates lifting the floating oil F obliquely upward from the second bottom wall portion 46 . That is, the action of sucking and recovering the floating oil F from the second bottom wall portion 46 can be stably obtained.
It should be noted that the angle θ3 is preferably 15 to 20° in order to make the above effects more remarkable.

<Second modification>
FIG. 12 is a side view showing a second modification of the nozzle portion 14 (suction nozzle 42) of the floating oil recovery device 10. As shown in FIG.
In this second modification, the suction nozzle 42 has a bottom wall member 47 in addition to the top wall portion 43 , the side wall portion 44 and the bottom wall portion 45 . The bottom wall member 47 has a bottom wall portion 48 and a pair of ear portions 49 . That is, the suction nozzle 42 (nozzle portion 14) has a plurality of bottom wall portions 45 and 48. As shown in FIG. The plurality of bottom wall portions 45 and 48 are arranged adjacent to each other with a gap in the direction away from the suction tube portion 12 in the horizontal direction (the front-rear direction in this modification).

In the illustrated example, the suction nozzle 42 has two bottom walls 45 , 48 .
Of the two bottom wall portions 45 and 48, the bottom wall portion (first bottom wall portion) 45 that connects (contacts) the peripheral wall of the branch pipe 22 is the same as the bottom wall portion 45 of the first embodiment described above. has a configuration of
Of the two bottom wall portions 45 and 48 , the bottom wall portion (second bottom wall portion) 48 arranged outside the bottom wall portion 45 in the front-rear direction forms part of the bottom wall member 47 .

The bottom wall member 47 is a plate-like member and is arranged on the first bottom wall portion 45 . The bottom wall member 47 is supported by the nozzle portion 14 so as to be movable in the direction in which the bottom wall portions 45 and 48 are inclined with respect to the liquid surface LS. Specifically, the bottom wall member 47 is arranged in a direction in which the bottom wall portions 45 and 48 are inclined with respect to the top wall portion 43, the side wall portion 44 and the bottom wall portion 45 of the suction nozzle 42 when viewed from the direction of the central axis C (bottom wall portion 47). It is slidable along the direction in which the walls 45 and 48 extend. Therefore, the bottom wall portion 48 of the bottom wall member 47 is also supported by the nozzle portion 14 so as to be movable in the direction in which the bottom wall portions 45 and 48 are inclined with respect to the liquid surface LS. That is, the bottom wall portion 48 is arranged along the direction in which the bottom wall portions 45 and 48 are inclined with respect to the top wall portion 43, the side wall portion 44, and the bottom wall portion 45 of the suction nozzle 42 when viewed from the direction of the central axis C. It is slidable.

A bottom wall portion (second bottom wall portion) 48 of the bottom wall member 47 is flat and extends substantially parallel to the first bottom wall portion 45 . The second bottom wall portion 48 faces the first bottom wall portion 45 with a gap therebetween. The second bottom wall portion 48 faces the first bottom wall portion 45 from above and from the outside in the front-rear direction.

The inner end portion of the second bottom wall portion 48 in the front-rear direction is arranged away from the peripheral wall of the branch pipe 22 to the outer side in the front-rear direction. The inner end portion of the second bottom wall portion 48 in the front-rear direction is positioned above the outer end portion of the first bottom wall portion 45 in the front-rear direction. In the illustrated example, the inner end in the front-rear direction of the second bottom wall portion 48 is located inside the outer end in the front-rear direction of the first bottom wall portion 45 in the front-rear direction. When viewed in the vertical direction, the inner portion of the second bottom wall portion 48 along the front-rear direction and the outer portion of the first bottom wall portion 45 along the front-rear direction are arranged to overlap each other.

The second bottom wall portion 48 extends obliquely downward as it extends outward in the front-rear direction (as it moves away from the suction pipe portion 12 in the horizontal direction) and is inserted into the liquid surface LS. An inner end portion of the second bottom wall portion 48 in the front-rear direction is positioned above the liquid surface LS. An outer end portion of the second bottom wall portion 48 in the front-rear direction is positioned below the liquid surface LS. In this modification, the outer (front end) end portion of the second bottom wall portion 48 is positioned on the outer side of the suction nozzle 42 (the top wall portion 43, the side wall portion 44, and the bottom wall portion 45 thereof) in the front and rear direction. is arranged so as to protrude outward in the front-rear direction from the end of the .

The vertical distance between the second bottom wall portion 48 and the top wall portion 43 decreases toward the inside in the front-rear direction. Since the second bottom wall portion 48 is inserted obliquely with respect to the liquid surface LS, the floating oil F floating on the liquid surface LS runs on the second bottom wall portion 48 .

The angle θ4 at which the second bottom wall portion 48 is inclined with respect to the liquid surface LS (the angle of inclination of the second bottom wall portion 48 with respect to the horizontal direction) is, for example, 10 to 25°. The angle θ4 is preferably 15-20°. In the illustrated example, the two bottom walls 45 and 48 of each suction nozzle 42 extend parallel to each other when viewed from the central axis C direction, and the angles θ2 and θ4 are the same.

A pair of ear portions 49 of the bottom wall member 47 are connected to both ends of the second bottom wall portion 48 in the width direction. The ear portion 49 has a flat plate shape extending in a direction perpendicular to the width direction. The ear portions 49 extend downward from both widthwise end portions of the second bottom wall portion 48 . A lower end of the ear portion 49 contacts the upper surface of the first bottom wall portion 45 . The ear portion 49 extends along the direction in which the bottom wall portions 45 and 48 are inclined with respect to the liquid surface LS.

The ear portion 49 has a plurality of position adjustment holes 49a arranged along the direction in which the bottom wall portions 45 and 48 are inclined with respect to the liquid surface LS. The position adjustment hole 49a penetrates the ear portion 49 in the width direction (thickness direction). The position adjustment hole 49a has a female screw portion on the inner peripheral surface of the position adjustment hole 49a. A screw member (not shown) that is passed through the through hole 44a of the side wall portion 44 is screwed into a predetermined (one) position adjustment hole 49a among the plurality of position adjustment holes 49a. The bottom wall member 47 is thereby fixed to the suction nozzle 42 .

According to the second modified example described above, the same effects as those of the above-described first embodiment can be obtained. Further, by moving the bottom wall portion 48 together with the bottom wall member 47 in the direction in which the bottom wall portions 45 and 48 are inclined according to the state and amount of the floating oil F floating on the liquid surface LS, the liquid surface LS is The position (in the vertical direction) of the second bottom wall portion 48 relative to the can be adjusted. Thereby, the collection efficiency of the floating oil F can be improved.
Further, since the angle θ4 is 10 to 25°, the same effect as the angle θ3 described above can be obtained. In order to make this effect more remarkable, the angle θ4 is preferably 15 to 20°.

<Third modification>
FIG. 13 is a side view showing a third modification of the nozzle portion 14 (suction nozzle 42) of the floating oil recovery device 10. As shown in FIG. 14(a)-(c) show the slide wall portion 52 of the bottom wall portion 50 of FIG.
In this third modification, the suction nozzle 42 has a ceiling wall portion 43 , a side wall portion 44 and a bottom wall portion 50 . The bottom wall portion 50 extends obliquely downward as it separates from the branch pipe 22 (suction pipe portion 12) in the horizontal direction (the front-rear direction in this modification), and is inserted into the liquid surface LS. The bottom wall portion 50 has a support wall portion 51 and a slide wall portion 52 .

The support wall portion 51 is a flat plate-shaped portion bridged between the pair of side wall portions 44 . Both ends of the support wall portion 51 in the width direction are connected to the pair of side wall portions 44 . The support wall portion 51 is fixed to the pair of side wall portions 44 . An inner end portion of the support wall portion 51 in the front-rear direction connects (contacts) with the peripheral wall of the branch pipe 22 . In addition, the inner end portion of the support wall portion 51 in the front-rear direction may be arranged with a slight gap from the peripheral wall of the branch pipe 22 . An inner end portion of the support wall portion 51 in the front-rear direction is positioned below the suction hole 22h of the branch pipe 22 and is arranged close to the suction hole 22h. That is, the inner end portion of the support wall portion 51 in the front-rear direction is positioned directly below the suction hole 22h and is arranged adjacent to the suction hole 22h.

The support wall portion 51 extends obliquely downward as it separates from the branch pipe 22 in the front-rear direction (that is, as it extends outward in the front-rear direction). An end portion of the support wall portion 51 on the inner side (base end side) in the front-rear direction is located above the liquid surface LS. An end portion of the support wall portion 51 on the outer side (front end side) in the front-rear direction is positioned below the liquid surface LS.
In other words, the support wall portion 51 extends obliquely downward as it separates from the suction tube portion 12 in the horizontal direction (the front-rear direction in this modification), and is inserted into the liquid surface LS.

The slide wall portion 52 is plate-shaped. In this modified example, the slide wall portion 52 has a rectangular plate shape. The plate surfaces (upper surface 52a and lower surface 52b) of the slide wall portion 52 face up and down. The slide wall portion 52 is arranged on the support wall portion 51 . The lower surface 52 b of the slide wall portion 52 contacts the upper surface of the support wall portion 51 . The slide wall portion 52 is placed on the upper surface of the support wall portion 51 and is slidable relative to the support wall portion 51 . The slide wall portion 52 is supported by the suction nozzle 42 so as to be movable on the support wall portion 51 in the direction in which the bottom wall portion 50 (the support wall portion 51) is inclined with respect to the liquid surface LS. That is, the bottom wall portion 50 is supported by the nozzle portion 14 so as to be movable in the direction in which the bottom wall portion 50 is inclined with respect to the liquid surface LS.

The upper surface 52a of the slide wall portion 52 has a portion parallel to the lower surface 52b of the slide wall portion 52 and a portion inclined with respect to the lower surface 52b.
A portion of the upper surface 52 a of the slide wall portion 52 that is parallel to the lower surface 52 b is positioned inside the slide wall portion 52 in the front-rear direction. Therefore, the inner portion of the slide wall portion 52 in the front-rear direction has a constant plate thickness along the front-rear direction.
A portion of the upper surface 52a of the slide wall portion 52 that is inclined with respect to the lower surface 52b is positioned outside the slide wall portion 52 in the front-rear direction. A portion of the upper surface 52a that is inclined with respect to the lower surface 52b has a smaller distance from the lower surface 52b toward the outer side in the front-rear direction. Therefore, the thickness of the outer portion of the slide wall portion 52 in the front-rear direction decreases toward the outer side in the front-rear direction.

The slide wall portion 52 has a liquid return groove 53 on the upper surface 52 a of the slide wall portion 52 . That is, the bottom wall portion 50 has the liquid return groove 53 on the upper surface 52 a of the bottom wall portion 50 . The liquid return groove 53 is recessed downward in the upper surface 52a and extends in the front-rear direction. Specifically, the liquid return groove 53 extends along the direction in which the bottom wall portion 50 is inclined with respect to the liquid surface LS on the upper surface 52a. A plurality of liquid return grooves 53 are arranged at intervals in the width direction on the upper surface 52a.

In the illustrated example, the liquid return groove 53 does not open on the end face facing the inside and the end face facing the outside in the front-rear direction of the slide wall portion 52 . The liquid return groove 53 is arranged in an intermediate portion located between the inner end and the outer end in the front-rear direction of the slide wall portion 52 . In addition, the liquid return groove 53 may be opened in at least one of the end face facing the inside and the end face facing the outside in the front-rear direction of the slide wall portion 52 .

In the portion of the upper surface 52a of the slide wall portion 52 that is parallel to the lower surface 52b, the groove depth of the liquid return groove 53 is constant along the front-rear direction. In the portion of the upper surface 52a of the slide wall portion 52 that is inclined with respect to the lower surface 52b, the groove depth of the liquid return groove 53 becomes shallower toward the outer side in the front-rear direction.

A side surface 52c of the slide wall portion 52 faces the width direction. A pair of side surfaces 52 c are provided on the slide wall portion 52 . The pair of side surfaces 52c face both sides of the slide wall portion 52 in the width direction. The side surface 52 c faces the side wall portion 44 of the suction nozzle 42 . Side 52c contacts side wall portion 44 .

The slide wall portion 52 has a screw hole 52d on the side surface 52c. The screw hole 52d opens in the side surface 52c and is recessed in the width direction. 52 d of screw holes are provided in multiple numbers by the side surface 52c. 52 d of several screw holes are arranged in parallel with the lower surface 52b in the side surface 52c. The plurality of screw holes 52d are arranged along the direction in which the bottom wall portion 50 is inclined with respect to the liquid surface LS on the side surface 52c. 52 d of screw holes have a female screw part in the internal peripheral surface of 52 d of screw holes. A screw member (not shown) that is passed through the through hole 44a of the side wall portion 44 is screwed into a predetermined (one) screw hole 52d among the plurality of screw holes 52d. Thereby, the slide wall portion 52 is fixed to the suction nozzle 42 .

According to the third modified example described above, the same effects as those of the above-described first embodiment can be obtained. Further, for example, by moving the bottom wall portion 50 (slide wall portion 52) in the direction in which the bottom wall portion 50 inclines according to the state and amount of floating oil F floating on the liquid surface LS, The vertical position of the bottom wall portion 50 (slide wall portion 52) can be adjusted. Thereby, the collection efficiency of the floating oil F can be improved.
Further, among the floating oil F and the liquid D such as water that have run on the slide wall portion 52, the water or the like flows into the liquid return groove 53 and is returned to the liquid surface LS through the liquid return groove 53. FIG. Therefore, the recovery efficiency of the floating oil F can be further enhanced.

Further, in this embodiment, as shown in FIG. 1, the pump unit 5 pumps out the liquid D from the bottom of the tank 2, pressurizes it, and sends it to the bubble generation nozzle 110. As shown in FIG.
In this case, the pump unit 5 pumps the liquid D from the bottom of the tank 2 away from the liquid surface LS on which the floating oil F floats, pressurizes it, and sends it to the bubble generating nozzle 110, whereupon the liquid D flows out into the tank 2 together with the air bubbles. Therefore, the liquid D having a low oil content can be effectively used for separating the floating oil F. Thereby, the running cost of the floating oil tank 1 can be reduced. Further, since the liquid D pressurized by the pump unit 5 is sent to the bubble generating nozzle 110, the oil and dust in the bubble generating nozzle 110 are ejected out of the nozzle together with the liquid D, thereby suppressing clogging inside the nozzle. be. Therefore, the function of the bubble generating nozzle 110 can be maintained satisfactorily, and the frequency of maintenance and member replacement of the bubble generating nozzle 110 can be reduced.

<Second embodiment>
A floating oil recovery device 20 provided in a floating oil tank 1 according to a second embodiment of the present invention will be described with reference to FIGS. 15 to 17. FIG.
In the second embodiment, the same reference numerals are given to the same parts as the components in the first embodiment, and the explanation thereof is omitted, and mainly the different points will be explained.

Among the components provided in the floating oil tank 1 of the present embodiment, the tank 2 other than the floating oil recovery device 20, the bubble liquid feeding pipe 3, the bubble generation nozzle 110, the pumping pipe 6, the pump section 5, the guide means 4 and the rear The process liquid-feeding pipe 7 has the same configuration as that described in the first embodiment.

The floating oil recovery device 20 is floated on the liquid surface LS of the liquid D in the tank 2 to recover the floating oil F.
As shown in FIGS. 15 to 17, the floating oil recovery device 20 includes a suction pipe portion 72, a float portion 13, and a nozzle portion 74. As shown in FIGS. Although not shown, the floating oil recovery device 20 includes a tube 18 , a suction source 17 and a floating oil recovery tank 19 .

The suction pipe portion 72 is connected to a nozzle portion 74 that sucks the floating oil F. As shown in FIG. The suction pipe portion 72 is provided between the nozzle portion 74 and the suction source 17 . The suction pipe portion 72 constitutes a part of a flow path (pipe line) of a suction pipe that sucks the floating oil F. As shown in FIG. The suction tube portion 72 is a portion of the suction tube (whole) located near the liquid surface LS. The float portion 13 supports the suction tube portion 72 and the nozzle portion 74 . The nozzle part 74 is arranged on the liquid surface LS. The float portion 13 moves up and down according to (changes in) the water level of the liquid D, and arranges the nozzle portion 74 and the suction pipe portion 72 near the liquid surface LS.

The suction pipe portion 72 has a portion (main pipe 81) extending vertically from above the tank 2 toward the liquid surface LS. In the example of this embodiment, the suction tube portion 72 is a tube with a circular cross section (circular tube, round pipe). The suction tube portion 72 is made of synthetic resin such as ultra-high molecular weight polyethylene (UHMWPE). The tube 18 is connected to the upper end of the suction tube portion 72 . The suction pipe portion 72 is connected to the suction source 17 and the floating oil recovery tank 19 via the tube 18 (see FIG. 9).

The suction tube portion 72 has a main tube 81 .
The main pipe 81 extends vertically. That is, the main pipe 81 is a portion of the suction pipe portion 72 that extends in the vertical direction. The lower end of the main pipe 81 is positioned below the liquid surface LS. The lower end of the main pipe 81 is arranged near the liquid surface LS. A portion of the main pipe 81 other than the lower end portion (a portion located above the lower end portion) is arranged above the liquid surface LS.
In the following description, the direction perpendicular to the axis O, which is the central axis of (the main pipe 81 of) the suction pipe portion 72, is referred to as the radial direction. Among the radial directions, a direction approaching the axis O is called a radial inner side, and a direction away from the axis O is called a radial outer side. Also, the direction of rotation around the axis O is called the circumferential direction.

The main pipe 81 has a suction hole 81h in the peripheral wall of the main pipe 81 . The suction hole 81h is a through hole penetrating the peripheral wall of the main pipe 81, and has an oval hole shape in the example of the present embodiment. 81 h of suction holes are arrange|positioned at the lower end part of the main pipe 81, and are extended in an up-down direction. 81 h of suction holes are provided in the lower end part of the surrounding wall of the main pipe 81 at intervals in the circumferential direction mutually (four in the example of this embodiment). The plurality of suction holes 81h are opened on the outer peripheral surface of the main pipe 81 at regular intervals in the circumferential direction.

One nozzle portion 74 is provided at the lower end portion of the suction tube portion 72 . The nozzle portion 74 has a substantially disc shape centered on the axis O of the suction tube portion 72 . In this embodiment, the nozzle part 74 is made of synthetic resin such as ultra-high molecular weight polyethylene (UHMWPE).

The nozzle portion 74 is floated (arranged) on the liquid surface LS of the liquid D by the float portion 13 and sucks the floating oil F. As shown in FIG. The nozzle portion 74 of this embodiment has an annular opening that opens over the entire circumference around the axis O on the outer circumference of the nozzle portion 74 . The opening of the nozzle portion 74 opens radially on the outer peripheral surface of the nozzle portion 74 . A lower end portion of the opening of the nozzle portion 74 is immersed under the liquid surface LS, and a portion other than the lower end portion is exposed above the liquid surface LS. That is, the nozzle portion 74 has a portion located below the liquid surface LS and a portion located above the liquid surface LS. The floating oil F on the liquid surface LS and the liquid D such as water can enter the nozzle section 74 through the opening.

The nozzle portion 74 has a top wall member 75 and a bottom wall member 76 .
The ceiling wall member 75 has a substantially circular ring plate shape centered on the axis O. As shown in FIG. The top wall member 75 is arranged above the liquid surface LS. The top wall member 75 has a through-hole that penetrates the top wall member 75 in the vertical direction. A main pipe 81 is inserted into the through hole. The top wall member 75 is fixed to the peripheral wall of the main pipe 81 .

The bottom surface of the top wall member 75 is planar and perpendicular to the axis O. As shown in FIG. The bottom surface of the top wall member 75 faces the liquid surface LS with a gap therebetween. The vertical distance between the bottom surface of the top wall member 75 and the liquid surface LS is, for example, 10 to 25 mm. This distance is preferably between 15 and 20 mm. The vertical distance between the lower surface of the top wall member 75 and the upper end of the bottom wall member 76 (the upper end of the bottom wall portion 77 described later) is, for example, 3 to 12 mm. This distance is preferably between 6 and 9 mm.
In the illustrated example, the upper surface of the top wall member 75 is tapered downward as it goes radially outward.

The bottom wall member 76 has a substantially disc shape centered on the axis O. As shown in FIG. The bottom wall member 76 is fixed to the lower end of the main pipe 81 . The bottom wall member 76 is arranged downwardly apart (with a gap) from the top wall member 75 . The upper end portion of the bottom wall member 76 is arranged above the liquid surface LS, and the portion other than the upper end portion (the portion located below the upper end portion) is arranged below the liquid surface LS. A space between the top wall member 75 and the bottom wall member 76 serves as an internal space of the nozzle portion 74 .

The bottom wall member 76 has a bottom wall portion 77 , an oil retaining hole 78 and a pipe fixing hole 79 .
The bottom wall portion 77 is provided on the upper surface of the bottom wall member 76 . The bottom wall portion 77 has a conical shape that expands around the axis O of the suction tube portion 72 . The bottom wall portion 77 extends obliquely downward as it separates from the suction tube portion 72 in the horizontal direction (in the radial direction in this embodiment), and is inserted into the liquid surface LS. A radially inner end of the bottom wall portion 77 is located above the liquid surface LS. A radial inner end portion of the bottom wall portion 77 is arranged close to the suction hole 81 h of the main pipe 81 . A radially outer end of the bottom wall portion 77 is located below the liquid surface LS. A radially outer end portion of the bottom wall portion 77 is connected to an upper end portion of the outer peripheral surface of the bottom wall member 76 .
Since the bottom wall portion 77 is thus inserted obliquely with respect to the liquid surface LS, the floating oil F floating on the liquid surface LS runs on the bottom wall portion 77 .

The angle θ5 at which the bottom wall portion 77 is inclined with respect to the liquid surface LS (the angle of inclination of the bottom wall portion 77 with respect to the horizontal direction) is, for example, 10 to 25°. The angle θ5 is preferably 15-20°.
The vertical distance between the bottom wall portion 77 and the lower surface of the top wall member 75 decreases radially inward from the opening located at the radially outer end of the nozzle portion 74 .

The bottom wall portion 77 has an oil retention groove 82 and a liquid return groove 83 .
A plurality of oil retaining grooves 82 are provided in the bottom wall portion 77 . The oil retaining groove 82 is recessed downward in the bottom wall portion 77 and extends in the circumferential direction. The groove width of the oil holding groove 82 becomes smaller toward the lower side. In the illustrated example, the cross-sectional shape of the oil retaining groove 82 (the cross-sectional shape perpendicular to the circumferential direction) is V-shaped. The groove width of the oil retaining groove 82 is constant along the circumferential direction. The groove depth of the oil retaining groove 82 is constant along the circumferential direction.

The plurality of oil retention grooves 82 are arranged in the radial direction. The oil retaining grooves 82 adjacent to each other in the radial direction are arranged adjacent to each other. In the example of the present embodiment, the oil retaining groove 82 is arranged in a portion of the bottom wall portion 77 located above the liquid surface LS.

A plurality of liquid return grooves 83 are provided in the bottom wall portion 77 . The liquid return groove 83 is recessed downward in the bottom wall portion 77 and extends in the radial direction. The liquid return groove 83 extends from the radial inner end to the outer end of the bottom wall portion 77 . The groove width of the liquid return groove 83 is constant along the vertical direction. The groove width of the liquid return groove 83 is constant along the radial direction. The groove width of the liquid return groove 83 is larger than the groove width of the oil holding groove 82 . The groove bottom of the liquid return groove 83 is planar and perpendicular to the axis O. As shown in FIG. The groove depth of the liquid return groove 83 becomes smaller toward the outer side in the radial direction. The groove depth of the liquid return groove 83 is greater than the groove depth of the oil retaining groove 82 .

The plurality of liquid return grooves 83 are circumferentially spaced from each other. In the example of the present embodiment, a plurality of (eight in the illustrated example) liquid return grooves 83 are arranged at regular intervals in the circumferential direction. The liquid return grooves 83 are arranged so as to divide the oil retention grooves 82 in the circumferential direction. A circumferential end of the oil holding groove 82 is connected to the liquid return groove 83 . That is, the inside of the oil retention groove 82 communicates with the inside of the liquid return groove 83 . The upper portion of the liquid return groove 83 is arranged above the liquid surface LS, and the lower portion thereof is arranged below the liquid surface LS.

The oil retention hole 78 is a bottomed hole recessed downward from the upper surface of the bottom wall member 76 . The oil retention hole 78 opens at the center of the top surface of the bottom wall member 76 . The oil retaining hole 78 is a circular hole with an inner diameter larger than that of the peripheral wall of the main pipe 81 . The inner peripheral surface of the oil retention hole 78 faces the lower end portion of the outer peripheral surface of the main pipe 81 with a gap in the radial direction. The inner peripheral surface of the oil holding hole 78 faces the suction hole 81h of the main pipe 81 with a gap in the radial direction. In the oil holding hole 78, the floating oil F that has climbed over the bottom wall portion 77 radially inward flows down and is temporarily held. The floating oil F that has flowed down into the oil retention hole 78 is sucked into the main pipe 81 through the suction hole 81h.

The pipe fixing hole 79 is a bottomed hole recessed downward from the bottom surface of the oil retaining hole 78 . The pipe fixing hole 79 opens at the center of the bottom surface of the oil retaining hole 78 . The tube fixing hole 79 is a circular hole. The inner diameter of the pipe fixing hole 79 is smaller than the inner diameter of the oil retaining hole 78 . The lower end of the main pipe 81 is inserted into the pipe fixing hole 79 and fixed. The pipe fixing hole 79 also functions as a cap that closes the lower end opening of the main pipe 81 .

In this floating oil recovery device 20, when the suction source 17 is operated, the internal space of the nozzle portion 74 connected to the suction source 17 becomes negative pressure, and the liquid D (mainly is the floating oil F, and the same applies below) and outside air is sucked.
The floating oil recovery device 20 sucks the liquid D and outside air into the nozzle portion 74 and introduces them into the main pipe 81 (suction pipe portion 72). That is, the liquid D moves obliquely upward along the slope of the bottom wall portion 77 in the nozzle portion 74 by the fluid suction force (air suction force) of the suction source 17, and enters the main pipe 81 through the suction hole 81h. be drawn in.

In the floating oil tank 1 of this embodiment described above, the same effects as those of the floating oil tank 1 of the first embodiment can be obtained. Further, according to the floating oil recovery device 20 of the present embodiment, the same effects as those of the floating oil recovery device 10 of the first embodiment can be obtained.

Further, since the bottom wall portion 77 has a conical shape that spreads around the axis O of the suction pipe portion 72, the nozzle portion 74 can collect the floating oil F from all directions in the horizontal direction (over the entire circumference around the axis O). Therefore, the recovery efficiency of the floating oil F is stably enhanced.

In addition, in this embodiment, the bottom wall portion 77 has a plurality of oil retaining grooves 82 extending in the circumferential direction, and the plurality of oil retaining grooves 82 are arranged in the radial direction, so that the following effects can be obtained.
In this case, the floating oil F that has run onto the bottom wall portion 77 is retained by the plurality of oil retention grooves 82 and easily stays on the bottom wall portion 77 . Further, water or the like having a higher specific gravity than the floating oil F accumulates at the groove bottom of the oil retaining groove 82 . This water or the like can be returned to the liquid surface LS through the liquid return groove 83 connected to the circumferential end of the oil holding groove 82 . Therefore, the recovery efficiency of the floating oil F is further improved.

Further, in this embodiment, since the bottom wall portion 77 has the liquid return groove 83 extending in the radial direction, the following effects can be obtained.
In this case, among the floating oil F and the liquid D such as water that have flowed onto the bottom wall portion 77 , water or the like flows into the liquid return groove 83 and is returned to the liquid surface LS through the liquid return groove 83 . Therefore, the recovery efficiency of the floating oil F can be further improved.

Further, in this embodiment, since the angle θ5 is 10 to 25°, the following effects can be obtained.
Since the angle .theta.5 is 10.degree. That is, the action of returning water or the like from the bottom wall portion 77 to the liquid surface LS can be stably obtained.
Since the angle θ5 is 25° or less, the fluid suction force of the suction source 17 can easily pull up the floating oil F obliquely upward from the bottom wall portion 77 . That is, the action of sucking and recovering the floating oil F from the bottom wall portion 77 can be stably obtained.
It should be noted that the angle θ5 is preferably 15 to 20° in order to make the above effects more remarkable.

It should be noted that the present invention is not limited to the above-described embodiments, and, for example, as described below, changes in configuration can be made without departing from the gist of the present invention.

The bubble generating nozzle 110 may generate microbubbles (bubbles) in the liquid D with a structure other than the structure described in the above embodiments.
The floating oil recovery devices 10 and 20 may recover the floating oil F from the liquid surface LS by a structure other than the structure described in the above-described embodiments.

In addition, within the scope that does not deviate from the spirit of the present invention, each configuration (component) described in the above-described embodiments, modifications, notes, etc. may be combined, and addition, omission, replacement, and other Change is possible. Moreover, the present invention is not limited by the embodiments described above, but only by the claims.

According to the floating oil tank of the present invention, floating oil can be recovered efficiently. Therefore, it has industrial applicability.

Reference Signs List 1 floating oil tank 2 tank 2a bottom wall 2b upstream vertical wall 2d horizontal wall 4 guide means 5 pump section 8 first partition plate 8a first main body section 8b 1st expansion/contraction part 8c 1st sealing part 9 2nd partition plate 9a 2nd body part 9b 2nd expansion/contraction part 9c 2nd sealing part 10, 20 Floating oil recovery Apparatus 12, 72 Suction tube portion 13 Float portion 14, 74 Nozzle portion 17 Suction source 45, 46, 48, 50, 77 Bottom wall portion 110 Bubble generating nozzle 111 Cylinder Body 112 Internal body 115 Channel 130 Inflow channel portion 131 Outflow channel portion 132 Microbubble generating channel portion 132a Expanded diameter channel portion 132b Reduced diameter channel portion , A... central axis, D... liquid, F... floating oil, FD... first direction, LS... liquid surface, SD... second direction

Claims (12)

a tank in which a liquid containing oil is stored;
a bubble generating nozzle that is immersed in the liquid and releases air bubbles into the liquid;
a floating oil recovery device that recovers floating oil by floating on the surface of the liquid ;
guide means arranged in the tank to guide the flow of the liquid,
The guide means includes a first partition plate disposed downstream of the bubble generating nozzle and upstream of the floating oil recovery device in a first horizontal direction in which the liquid in the tank flows. have
The first partition plate has an upper end portion positioned below the liquid surface,
The tank has a pair of lateral walls spaced apart from each other in a second horizontal direction perpendicular to the first direction,
The first partition plate is
a plate-shaped first main body;
a first stretchable part projecting from the end of the first main body in the second direction so as to be stretchable in the second direction and in contact with the lateral wall;
Floating oil tank. The first partition plate has a mounting position that can be adjusted in at least one of the first direction and the vertical direction in the tank.
The floating oil tank according to claim 1 . The first partition plate has a first sealing portion that seals a gap between an end portion of the first body portion in the second direction and the lateral wall,
The floating oil tank according to claim 1 or 2 . a tank in which a liquid containing oil is stored;
a bubble generating nozzle that is immersed in the liquid and releases air bubbles into the liquid;
a floating oil recovery device that recovers floating oil by floating on the surface of the liquid;
guide means arranged in the tank to guide the flow of the liquid,
The tank is
a bottom wall;
an upstream vertical wall connected to an upstream end of the bottom wall in a first horizontal direction in which the liquid in the tank flows;
A plurality of the bubble generating nozzles are provided,
The guide means has a second partition plate arranged upstream of at least one of the plurality of bubble generating nozzles and downstream of the upstream vertical wall in the first direction,
The tank has a pair of lateral walls spaced apart from each other in a second horizontal direction perpendicular to the first direction,
The second partition plate is
a plate-shaped second main body;
a second stretchable part protruding from the end of the second main body in the second direction in the second direction so as to be stretchable and in contact with the lateral wall;
Floating oil tank. The second partition plate has a mounting position that can be adjusted in at least one of the first direction and the vertical direction in the tank.
The floating oil tank according to claim 4 . The second partition plate has a second sealing portion that seals a gap between an end portion of the second body portion in the second direction and the lateral wall,
The floating oil tank according to claim 4 or 5 . A plurality of bubble generating nozzles are provided at intervals in a first horizontal direction in which the liquid in the tank flows and in a second horizontal direction perpendicular to the first direction. to be
The floating oil tank according to any one of claims 1 to 6 . The bubble-generating nozzle emits bubbles upward in the liquid.
The floating oil tank according to any one of claims 1 to 7 . the bubble-generating nozzle emits microbubbles into the liquid;
The floating oil tank according to any one of claims 1 to 8 . The bubble generating nozzle is
a cylindrical body having a central axis and extending in the axial direction of the central axis;
an inner body arranged inside the tubular body;
a flow path formed inside the cylindrical body,
The flow path is
an inflow-side channel portion positioned at one end in the axial direction of the cylindrical body;
an outflow-side flow path portion positioned at the other end in the axial direction of the cylindrical body;
a microbubble generation channel portion located between the inflow-side channel portion and the outflow-side channel portion in the axial direction and communicating with the inflow-side channel portion and the outflow-side channel portion; ,
The microbubble generation flow path portion is formed by the inner peripheral surface of the cylindrical body and the outer peripheral surface of the inner body,
The microbubble generation flow path part is
a diameter-enlarged flow path portion whose diameter increases toward the other side in the axial direction;
a diameter-reduced flow passage portion disposed on the other side in the axial direction of the increased diameter flow passage portion, communicating with the increased diameter flow passage portion, and having a diameter that decreases toward the other side in the axial direction;
The floating oil tank according to claim 9 . The floating oil recovery device is
a float part floating on the liquid surface;
a suction tube portion supported by the float portion;
a nozzle portion connected to the suction pipe portion and disposed on the liquid surface;
a suction source that is connected to the suction pipe portion and sucks floating oil on the liquid surface from the nozzle portion through the suction pipe portion;
The nozzle portion has a bottom wall portion that extends obliquely downward as it moves away from the suction tube portion in the horizontal direction and is inserted into the liquid surface.
Floating oil tank according to any one of claims 1 to 10 . a pump unit that pumps out the liquid from the bottom of the tank, pressurizes it, and sends it to the bubble generation nozzle;
Floating oil tank according to any one of claims 1 to 11 .

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