JP7134023B2 - Floating oil recovery device - Google Patents

Description

The present invention relates to a floating oil recovery system.

Conventionally, for example, a floating oil suction device disclosed in Patent Document 1 is known. This floating oil suction device sucks the floating oil that is a mixture of liquid and oil. The floating oil suction device includes a cylindrical suction nozzle that floats near the surface of the mixed liquid due to a specific gravity difference with the mixed liquid or by float.
The suction nozzle has a top opening and a side opening. The top opening is located on the top surface of the suction nozzle and sucks bubbles on the surface of the liquid mixture. A side opening is located on the side of the suction nozzle to suck floating oil. The foam and floating oil sucked from the suction nozzle are sucked by the recovery pump through the pipe inside the suction nozzle.

JP 2015-54301 A

In the conventional floating oil recovery device, a large amount of liquid such as water is sucked together with the floating oil. For this reason, there is room for improvement in terms of increasing the recovery efficiency of floating oil by reducing the amount (ratio) of liquid such as water recovered.

SUMMARY OF THE INVENTION In view of the above circumstances, it is an object of the present invention to provide a floating oil recovery apparatus capable of enhancing the recovery efficiency of floating oil.

One aspect of the floating oil recovery device of the present invention includes a float portion that floats on a liquid surface, a suction pipe portion that is supported by the float portion, and a nozzle portion that is 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 has a plurality of bottom walls that extend obliquely downward and are inserted into the liquid surface, and the plurality of bottom walls are adjacent to each other with a gap in a direction away from the suction pipe portion in the horizontal direction. are placed .

According to one aspect of the present invention, the bottom wall of the nozzle part extends obliquely downward as it moves away from the suction pipe part in the horizontal direction, and is obliquely inserted into the liquid surface. For this reason, when liquids such as oil and water that float on the bottom wall are sucked diagonally upward along the slope of the bottom wall, liquids such as water on the bottom wall will be absorbed by the slope of the bottom wall. It becomes easier to return to the liquid surface. In addition, floating oil on the bottom wall can be easily pulled up 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.

In the floating oil recovery device, the nozzle section has a plurality of bottom walls, and the plurality of bottom walls are arranged adjacent to each other with a gap in a direction away from the suction pipe section in the horizontal direction . .

In this case, since the nozzle section has a plurality of bottom walls, separation of the floating oil and the liquid on the bottom wall can be further promoted, and the recovery efficiency of the floating oil can be improved. That is, when the floating oil and liquid are sucked toward the suction tube portion while overcoming the plurality of bottom walls, the liquid is returned to the liquid surface between the plurality of bottom walls. That is, the floating oil climbs over the plurality of bottom walls and is sucked into the suction pipe portion, but when the liquid climbs over the plurality of bottom walls, it is easily returned to the liquid surface between the bottom walls. Therefore, the recovery efficiency of the floating oil is further enhanced.

In the floating oil recovery device, the bottom wall is preferably supported by the nozzle part so as to be movable in a direction in which the bottom wall is inclined with respect to the liquid surface.

In this case, the position of the bottom wall (in the vertical direction) with respect to the liquid surface can be adjusted by moving the bottom wall in the direction in which the bottom wall inclines according to the state and amount of oil floating on the liquid surface. . As a result, the floating oil collection efficiency can be improved.

In the floating oil recovery device, the bottom wall preferably has a liquid return groove on the upper surface of the bottom wall.

In this case, among the floating oil and the liquid that have run on the bottom wall, the liquid flows into the liquid return groove and is returned to the liquid surface through the liquid return groove. Therefore, the recovery efficiency of the floating oil can be further enhanced.
Further, one aspect of the floating oil recovery device of the present invention includes a float portion that floats on a liquid surface, a suction pipe portion that is supported by the float portion, and a suction pipe portion that is connected to the suction pipe portion and arranged on the liquid surface. and a suction source that is connected to the suction pipe and sucks floating oil on the liquid surface from the nozzle through the suction pipe, wherein the nozzle is horizontally separated from the suction pipe. It has a bottom wall that extends obliquely downward and is inserted into the liquid surface, the suction pipe portion extends vertically, and the bottom wall is a cone that expands around the axis of the suction pipe portion. The bottom wall has a plurality of oil retaining grooves extending in a circumferential direction around the axis, and the plurality of oil retaining grooves are arranged in a radial direction orthogonal to the axis.
Further, one aspect of the floating oil recovery device of the present invention includes a float portion that floats on a liquid surface, a suction pipe portion that is supported by the float portion, and a suction pipe portion that is connected to the suction pipe portion and arranged on the liquid surface. and a suction source that is connected to the suction pipe and sucks floating oil on the liquid surface from the nozzle through the suction pipe, wherein the nozzle is horizontally separated from the suction pipe. It has a bottom wall that extends obliquely downward and is inserted into the liquid surface, the suction pipe portion extends vertically, and the bottom wall is a cone that expands around the axis of the suction pipe portion. and the bottom wall has a radially extending liquid return channel perpendicular to the axis.

In the floating oil recovery device, the suction pipe portion extends in the vertical direction, and the bottom wall has a conical shape that expands around the axis of the suction pipe portion .

In this case, the nozzle section collects the floating oil from all directions in the horizontal direction (over the entire circumference around the axis of the suction pipe section). Therefore, the recovery efficiency of the floating oil is stably enhanced.

In the floating oil recovery device, the bottom wall has a plurality of oil retaining grooves extending in a circumferential direction around the axis, and the plurality of oil retaining grooves are arranged in a radial direction orthogonal to the axis.

In this case, the floating oil that has run on the bottom wall is retained by the plurality of oil retention grooves and tends to remain on the bottom wall. In addition, liquid such as water having a higher specific gravity than the floating oil accumulates at the bottom of the oil retaining groove. This liquid can be returned to the liquid surface through the circumferential ends of the oil retention grooves. Therefore, the floating oil collection efficiency is further improved.

In the floating oil recovery device, the bottom wall has a liquid return groove extending in a radial direction perpendicular to the axis .

In this case, among the floating oil and the liquid that have run on the bottom wall, the liquid flows into the liquid return groove and is returned to the liquid surface through the liquid return groove. Therefore, the recovery efficiency of the floating oil can be further enhanced.

In the floating oil recovering device, the float portion supports a float body that floats on the liquid surface and the float body. and a fixed float support.

In this case, the vertical relative position between the float portion and the suction tube portion can be adjusted, and the vertical position of the nozzle portion with respect to the liquid surface can be adjusted. Therefore, by appropriately setting the vertical position of the bottom wall of the nozzle portion, it becomes difficult to suck liquid such as water from the nozzle portion, and it becomes easy to suck floating oil, so that the collection efficiency of floating oil can be stably improved.

According to the floating oil recovery device of one aspect of the present invention, the floating oil recovery efficiency can be enhanced.

It is a top view which shows the floating oil collection|recovery apparatus of 1st Embodiment. BRIEF DESCRIPTION OF THE DRAWINGS It is a side view (partially including a schematic diagram) which shows the floating oil collection|recovery apparatus of 1st Embodiment. It is a side view which shows the nozzle part of the floating oil collection|recovery apparatus of 1st Embodiment. FIG. 4 is a side view showing a first modified example of the nozzle portion of FIG. 3; FIG. 4 is a side view showing a second modification of the nozzle portion of FIG. 3; FIG. 4 is a side view showing a third modification of the nozzle portion of FIG. 3; 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 of 2nd Embodiment. FIG. 9 is a top view showing a bottom wall member of the nozzle portion of FIG. 8; FIG. 9 is a vertical cross-sectional view showing a bottom wall member of the nozzle portion of FIG. 8;

<First Embodiment>
A floating oil recovery device 10 according to a first embodiment of the present invention will be described with reference to the drawings.
1 to 3 are diagrams showing a floating oil recovery device 10 of a first embodiment.

The floating oil recovery device 10 of the present embodiment is arranged in a separation tank for waste liquid (waste water) D in a facility such as a factory that manufactures can bodies for two-piece cans.
The waste liquid D stored in the separation tank is subjected to microbubble treatment. As a result, oil, dust, and the like (hereinafter referred to as floating oil F) are separated from liquid such as water and float on the liquid surface LS. Floating oil F has a foamy, liquid, or solid portion that floats on the liquid surface LS.
The floating oil recovery device 10 has a structure that floats on the liquid surface LS of the drainage D and recovers the floating oil F from the drainage D.

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 .
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. The float portion 13 moves vertically according to the water level of the drainage D (vertical position of the liquid surface LS) when the water level fluctuates. 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 drainage D (fluctuations).

The liquid surface LS of the drainage D spreads in the horizontal direction. In this embodiment, the direction perpendicular to the liquid surface LS is called the height direction or the vertical direction (Z direction). The height direction is the vertical direction. The upper side in the height direction is simply referred to as the upper side (or upper side), and the lower side in the height direction is simply referred to as the lower side (or lower side).

Among the horizontal directions, the direction in which the nozzle portion 14 extends is called the front-rear direction (X direction). 1 is called the front side, and the left side of the paper is called the rear 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 height direction and the front-rear direction is called a width direction (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. 1 is called the left side, and the lower side of the paper surface is called the right side.

The height 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. are not limited to those indicated by these names.

The suction tube part 12 is arranged above and on the liquid surface LS. The suction pipe section 12 has a portion (main pipe 21) extending from above the separation tank toward the liquid surface LS and a portion (branch pipe 22) extending 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 .

22 h of suction holes are opened in the outer peripheral surface of the branch pipe 22 . 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. 3, 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 to be formed is, for example, 35 to 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. 1 and 2, 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 drainage D. As shown in FIG. 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. 1, 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 waste liquid D. As shown in FIG. 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 drain 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. 3 , 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. 3, 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 dimension in the height direction is smaller than the dimension in the width direction and the dimension in the front-rear direction. 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 ceiling wall 43 , side walls 44 and a bottom wall 45 . That is, the nozzle portion 14 has a ceiling wall 43 , side walls 44 and a bottom wall 45 .
The top wall 43 is a substantially flat plate-shaped portion that is connected to the front-rear outer end of the mounting portion 41 and extends from this end in the front-rear direction. The ceiling wall 43 extends substantially horizontally. An end portion of the top wall 43 on the tip side (outside in the front-rear direction) extends with a slight upward slant toward the tip side. The ceiling wall 43 is arranged above the liquid surface LS. The lower surface of the ceiling wall 43 faces the liquid surface LS from above with a gap between it and the liquid surface LS. The vertical distance between the lower surface of the ceiling wall 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 walls 44 are connected to both ends of the top wall 43 in the width direction. The side wall 44 has a flat plate shape extending in a direction perpendicular to the width direction. The side walls 44 extend downward from both ends of the top wall 43 in the width direction. The lower end of the side wall 44 is immersed in the drainage D.

The bottom wall 45 is a flat plate-shaped portion that bridges between the pair of side walls 44 . Both ends of the bottom wall 45 in the width direction are connected to the pair of side walls 44 . The bottom wall 45 is fixed with the pair of side walls 44 . An inner end portion of the bottom wall 45 in the front-rear direction connects (contacts) with the peripheral wall of the branch pipe 22 . The inner end portion of the bottom wall 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 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 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 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). An inner (base end) end portion of the bottom wall 45 in the front-rear direction is located above the liquid surface LS. An outer (front end) end portion of the bottom wall 45 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 45 is located 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 45, and the bottom wall 45 inclines downward as it separates from the suction tube portion 12 in the horizontal direction (the front-rear direction in this embodiment), and the liquid surface LS rises. is inserted into In this manner, since the bottom wall 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 45 .

The angle θ2 at which the bottom wall 45 is inclined with respect to the liquid surface LS (the angle of inclination of the bottom wall 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 45 and the top wall 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. 2, the suction source 17 and the floating oil recovery tank 19 are installed outside the separation tank in which the waste 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 Drainage D (mainly floating oil F, the same applies hereinafter) in the vicinity of the liquid surface LS and the outside air are sucked from the opening of .
The floating oil recovering device 10 sucks the drainage D and the outside air into the suction nozzle 42 and introduces them into the branch pipe 22 (suction pipe portion 12). That is, the drainage D moves diagonally upward along the slope of the bottom wall 45 in 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.

According to the floating oil recovery device 10 of the present embodiment described above, the bottom wall 45 of the nozzle portion 14 extends downward as it separates from the suction pipe portion 12 in the horizontal direction, and extends toward the liquid surface LS. inserted obliquely. For this reason, when floating oil F and liquid such as water running on the bottom wall 45 are sucked obliquely upward along the slope of the bottom wall 45, the liquid such as water on the bottom wall 45 is The inclination of the wall 45 facilitates the return to the liquid surface LS. Further, the floating oil F on the bottom wall 45 can be easily lifted obliquely upward along the slope of the bottom wall 45 . As a result, the recovery efficiency of the floating oil F can be increased by reducing the recovery amount (ratio) of the liquid such as water.

Specifically, the floating oil F has a lower specific gravity than a liquid such as water, and is located above the liquid, so it easily rides on the bottom wall 45 . In addition, when the floating oil F runs on the bottom wall 45, it is less likely to flow diagonally downward due to gravity (more likely to stay on the bottom wall 45 than liquid). The floating oil F is likely to be pulled up obliquely upward on the bottom wall 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 liquid such as water 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 45 . Further, even if the liquid runs on the bottom wall 45, it is likely to flow obliquely downward due to gravity (it is difficult to stay on the bottom wall 45). The liquid is less likely to be pulled up obliquely upward on the bottom wall 45 by the fluid suction force of the suction source 17 . Therefore, the amount of liquid 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 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 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, liquid such as water is prevented from being directly sucked into the branch pipe 22 from the suction hole 22 h without passing over the bottom wall 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 θ2 is 10° or more, liquid such as water easily flows obliquely downward from the bottom wall 45 . That is, the action of returning the liquid from the bottom wall 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 45 . That is, the operation of sucking and recovering the floating oil F from the bottom wall 45 can be stably obtained.
In order to make the above effect more remarkable, the angle θ2 is preferably 15 to 20°.

Further, in this embodiment, 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 tube portion 12 so that the position in the vertical direction can be adjusted.
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 45 of the nozzle portion 14 with respect to the liquid surface LS can be favorably maintained, making it difficult to suck liquid such as water from the nozzle portion 14 and making it easy to suck floating oil F. Collection efficiency can be stably improved.

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

<First modification>
FIG. 4 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 46 in addition to the top wall 43 , side walls 44 and bottom wall 45 . That is, the nozzle section 14 has a plurality of bottom walls 45 and 46 . The plurality of bottom walls 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 modification).

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

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

The second bottom wall 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 46 in the front-rear direction is located above the liquid surface LS. An outer end portion of the second bottom wall 46 in the front-rear direction is located below the liquid surface LS. In this modified example, the front-rear direction outer (tip end) end of the second bottom wall 46 is positioned at the front-rear direction outer end of the suction nozzle 42 .

The vertical distance between the second bottom wall 46 and the top wall 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 46 is inserted obliquely with respect to the liquid surface LS, the floating oil F floating on the liquid surface LS is put on the second bottom wall 46 .

The angle θ3 at which the second bottom wall 46 is inclined with respect to the liquid surface LS (the angle of inclination of the second bottom wall 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 walls 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 walls 45 and 46, separation of the floating oil F and the liquid on the bottom walls 45 and 46 can be further facilitated, and the recovery efficiency of the floating oil F can be improved. That is, when the floating oil F and the liquid are sucked toward the branch pipe 22 (suction pipe portion 12) while climbing over the plurality of bottom walls 45, 46, the liquid is returned to the liquid surface LS. That is, the floating oil F climbs over the plurality of bottom walls 45 and 46 and is sucked into the branch pipe 22, but the liquid flows between the bottom walls 45 and 46 when it climbs over the plurality of bottom walls 45 and 46. It becomes easy to be returned to the liquid surface LS. Therefore, the recovery efficiency of the floating oil F is further enhanced.

Specifically, the drainage D sucked by the suction nozzle 42 is caused to climb over two slopes (bottom walls 45 and 46 ) before reaching the branch pipe 22 . At this time, the floating oil F with a small specific gravity easily reaches the branch pipe 22, but the liquid with a large specific gravity cannot climb over the two slopes (bottom walls 45 and 46) and return to the liquid surface LS. easier to be In other words, the liquid is less likely to be introduced into the branch pipe 22, and the amount of liquid recovered is reduced.
Therefore, the separation of the floating oil F and the liquid 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, liquid such as water easily flows obliquely downward from above the second bottom wall 46 . That is, the action of returning the liquid to the liquid surface LS from above the second bottom wall 46 can be stably obtained.
Since the angle .theta.3 is 25.degree. That is, the action of sucking and recovering the floating oil F from the second bottom wall 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. 5 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 43 , side walls 44 and bottom wall 45 . The bottom wall member 47 has a bottom wall 48 and a pair of ears 49 . That is, the suction nozzle 42 (nozzle portion 14) has a plurality of bottom walls 45 and 48. As shown in FIG. The plurality of bottom walls 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 walls 45 and 48, the bottom wall (first bottom wall) 45 that connects (contacts) the peripheral wall of the branch pipe 22 has the same configuration as the bottom wall 45 of the first embodiment described above. .
Of the two bottom walls 45 , 48 , the bottom wall (second bottom wall) 48 arranged outside the bottom wall 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 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 walls 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 walls 45 and 48 are inclined with respect to the ceiling wall 43, the side walls 44 and the bottom wall 45 of the suction nozzle 42 (the bottom walls 45 and extending direction). Therefore, the bottom wall 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 walls 45 and 48 are inclined with respect to the liquid surface LS. That is, the bottom wall 48 is slidable relative to the ceiling wall 43, the side walls 44 and the bottom wall 45 of the suction nozzle 42 along the direction in which the bottom walls 45 and 48 are inclined when viewed from the central axis C direction. .

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

The inner end portion of the second bottom wall 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 in the front-rear direction of the second bottom wall 48 is located above the outer end in the front-rear direction of the first bottom wall 45 . In the illustrated example, the inner end in the front-rear direction of the second bottom wall 48 is located inside the outer end in the front-rear direction of the first bottom wall 45 in the front-rear direction. When viewed from above and below, the longitudinally inner portion of the second bottom wall 48 and the longitudinally outer portion of the first bottom wall 45 overlap each other.

The second bottom wall 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 48 in the front-rear direction is located above the liquid surface LS. An outer end portion of the second bottom wall 48 in the front-rear direction is located below the liquid surface LS. In this modified example, the front-rear direction outer (tip side) end of the second bottom wall 48 is positioned closer to the front-rear direction outer end than the suction nozzle 42 (top wall 43, side wall 44, and bottom wall 45 thereof). are arranged so as to protrude outward in the front-rear direction.

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

The angle θ4 at which the second bottom wall 48 is inclined with respect to the liquid surface LS (the angle of inclination of the second bottom wall 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 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 48 . A lower end of the ear portion 49 contacts the upper surface of the first bottom wall 45 . The ear portion 49 extends along the direction in which the bottom walls 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 walls 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 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, for example, by moving the bottom wall member 47 and the bottom wall 48 in the direction in which the bottom walls 45 and 48 are inclined according to the state and amount of the floating oil F floating on the liquid surface LS, the The (vertical) position of the bottom wall 48 of 2 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. 6 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. 7(a)-(c) show the sliding wall portion 52 of the bottom wall 50 of FIG.
In this third modification, the suction nozzle 42 has a top wall 43 , a side wall 44 and a bottom wall 50 . The bottom wall 50 inclines downward as it separates from the branch pipe 22 (suction pipe portion 12) in the horizontal direction (front-rear direction in this modified example) and is inserted into the liquid surface LS. The bottom wall 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 walls 44 . Both ends of the support wall portion 51 in the width direction are connected to the pair of side walls 44 . The support wall portion 51 is fixed to the pair of side walls 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 on the support wall portion 51 so as to be movable in the direction in which the bottom wall 50 (the support wall portion 51) is inclined with respect to the liquid surface LS. That is, the bottom wall 50 is supported by the nozzle portion 14 so as to be movable in the direction in which the bottom wall 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 50 has a liquid return groove 53 on the upper surface 52a of the bottom wall 50. As shown in FIG. 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 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 44 of the suction nozzle 42 . Side 52 c contacts side wall 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 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 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. For example, depending on the state and amount of the floating oil F floating on the liquid surface LS, the bottom wall 50 (slide wall portion 52) is tilted in the direction in which the bottom wall 50 (slide wall portion 52 and support wall portion 51) is inclined. By moving it, the position (vertical direction) of the bottom wall 50 (slide wall portion 52) with respect to the liquid surface LS can be adjusted. Thereby, the collection efficiency of the floating oil F can be improved.
Further, among the floating oil F and the liquid that have run on the slide wall portion 52, the liquid 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.

<Second embodiment>
A floating oil recovery device 20 according to a second embodiment of the present invention will be described with reference to the drawings.
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.

As shown in FIGS. 8 to 10, the floating oil recovery device 20 includes a suction pipe portion 72, a float portion 13, and a nozzle portion 74. As shown in FIG. The floating oil recovery device 20 also 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 (fluctuations in) the water level of the drainage D, and arranges the nozzle portion 74 and the suction pipe portion 72 near the liquid surface LS.

The suction tube portion 72 extends vertically. The suction pipe portion 72 has a portion (main pipe 81) extending from above the separation tank 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. 2).

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 (central axis) O 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 drain 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 liquid such as water can enter the nozzle portion 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 ceiling wall member 75 and the upper end of the bottom wall member 76 (the upper end of the bottom wall 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 77 , an oil retaining hole 78 and a tube fixing hole 79 .
The bottom wall 77 is provided on the upper surface of the bottom wall member 76 . The bottom wall 77 has a conical shape extending around the axis O of the suction tube portion 72 . The bottom wall 77 extends obliquely downward as it separates from the suction tube portion 72 in the horizontal direction (radial direction in this embodiment) and is inserted into the liquid surface LS. A radially inner end of the bottom wall 77 is located above the liquid surface LS. A radially inner end portion of the bottom wall 77 is arranged close to the suction hole 81 h of the main pipe 81 . A radial outer end of the bottom wall 77 is located below the liquid surface LS. A radially outer end portion of the bottom wall 77 is connected to an upper end portion of the outer peripheral surface of the bottom wall member 76 .
In this manner, since the bottom wall 77 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 77 .

The angle θ5 at which the bottom wall 77 is inclined with respect to the liquid surface LS (the angle of inclination of the bottom wall 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 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 77 has oil retention grooves 82 and liquid return grooves 83 .
A plurality of oil retaining grooves 82 are provided in the bottom wall 77 . The oil retaining groove 82 is recessed downward in the bottom wall 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 retention groove 82 is arranged in a portion of the bottom wall 77 located above the liquid surface LS.

A plurality of liquid return grooves 83 are provided in the bottom wall 77 . The liquid return groove 83 is recessed downward in the bottom wall 77 and extends radially. The liquid return groove 83 extends from the radially inner end to the outer end of the bottom wall 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 holding 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. Floating oil F that has climbed over the bottom wall 77 radially inward flows down and is temporarily held in the oil holding hole 78 . 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 drained liquid D ( It is mainly floating oil F, and the same applies hereinafter) and outside air are sucked.
The floating oil recovery device 20 sucks the drainage D and the outside air into the nozzle portion 74 and introduces them into the main pipe 81 (suction pipe portion 72). That is, the drainage D moves obliquely upward along the slope of the bottom wall 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.

According to the floating oil recovery device 20 of this embodiment described above, the same effects as those of the above-described first embodiment can be obtained.
Further, since the bottom wall 77 has a conical shape that spreads around the axis O of the suction pipe portion 72, the nozzle portion 74 collects 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.

Further, in this embodiment, the bottom wall 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 runs on the bottom wall 77 is held by the plurality of oil holding grooves 82 and easily stays on the bottom wall 77 . Further, a liquid such as water having a higher specific gravity than the floating oil F accumulates at the groove bottom of the oil holding groove 82 . This liquid can be returned to the liquid surface LS through the liquid return groove 83 connected to the circumferential end of the oil retaining groove 82 . Therefore, the recovery efficiency of the floating oil F is further improved.

Further, in this embodiment, since the bottom wall 77 has the liquid return groove 83 extending in the radial direction, the following effects can be obtained.
In this case, of the floating oil F and the liquid that have run on the bottom wall 77, the liquid 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 θ5 is 10° or more, liquid such as water easily flows obliquely downward from the bottom wall 77 . That is, the effect of returning the liquid from the bottom wall 77 to the liquid surface LS is stably obtained.
Since the angle θ5 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 77 . That is, the operation of sucking and recovering the floating oil F from the bottom wall 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.

In the above-described embodiment, an example in which the bottom wall extends linearly in a vertical cross-sectional view of the nozzle portion was given, but the present invention is not limited to this. In a vertical cross-sectional view of the nozzle portion, the bottom wall may extend, for example, in a curved shape. The bottom wall of the nozzle portion is not limited to a planar shape, and may be curved.

Any one of the angles θ1 to θ5, which are the inclination angles of the bottom wall, may be changeable by adjusting the attachment angle of the bottom wall. That is, the angles θ1 to θ5 may be adjustable within each numerical range of the angles θ1 to θ5. That is, the inclination of the bottom wall with respect to the liquid surface LS may be changeable.

The nozzle portion may extend obliquely downward as it moves away from the suction tube portion in the horizontal direction, and may have a bottom wall that is inserted into the liquid surface LS. It is not limited to the examples given 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 recovery device of the present invention, it is possible to improve the recovery efficiency of the floating oil. Therefore, it has industrial applicability.

10, 20... Floating oil recovery device 12, 72... Suction pipe part 13... Float part 14, 74... Nozzle part 17... Suction source 21, 81... Main pipe (portion extending in the vertical direction of the suction pipe part ), 31... Float main body 32... Float support part 45, 46, 48, 50, 77... Bottom wall 52a... Upper surface 53, 83... Liquid return groove 82... Oil retaining groove F... Floating oil, LS …Liquid level, O…Axis

Claims (6)

A float part that floats 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 part has a plurality of bottom walls that extend downward as it moves away from the suction tube part in the horizontal direction and that is inserted into the liquid surface ,
The floating oil recovering device , wherein the plurality of bottom walls are arranged adjacent to each other with a gap in a direction away from the suction pipe portion in the horizontal direction . The floating oil recovery device according to claim 1 ,
The floating oil recovering device, wherein the bottom wall is supported by the nozzle part so as to be movable in a direction in which the bottom wall is inclined with respect to the liquid surface. The floating oil recovery device according to claim 1 or 2 ,
The floating oil recovery device, wherein the bottom wall has a liquid return groove on an upper surface of the bottom wall. A float part that floats 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 part has a bottom wall that extends obliquely downward as it moves away from the suction tube part in the horizontal direction and is inserted into the liquid surface,
The suction tube portion extends vertically,
The bottom wall has a conical shape that spreads around the axis of the suction tube,
The bottom wall has a plurality of oil retaining grooves extending in a circumferential direction around the axis,
The floating oil recovering device, wherein the plurality of oil retaining grooves are arranged in a radial direction perpendicular to the axis. A float part that floats 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 part has a bottom wall that extends obliquely downward as it moves away from the suction tube part in the horizontal direction and is inserted into the liquid surface,
The suction tube portion extends vertically,
The bottom wall has a conical shape that spreads around the axis of the suction tube,
The floating oil recovery device, wherein the bottom wall has a radially extending liquid return groove orthogonal to the axis. The floating oil recovery device according to any one of claims 1 to 5 ,
The float part is
a float body floating on the liquid surface;
A floating oil recovering device, comprising: a float support portion that supports the float body and is fixed to a vertically extending portion of the suction pipe portion so that the position thereof in the vertical direction is adjustable.

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