JP2020032348A - Floating oil recovery device - Google Patents

Abstract

To provide a floating oil recovery device which has increased recovery efficiency of floating oil.SOLUTION: A floating oil recovery device comprises: a float portion 13 which floats on a liquid face LS; a suction tube portion 12 which is supported by the float portion 13; a nozzle portion 14 which is connected to the suction tube portion 12 and is disposed on the liquid face LS; and a suction source which is coupled to the suction tube portion 12 and suctions floating oil F on the liquid face LS from the nozzle portion 14 through the suction tube portion 12. The nozzle portion 14 has a bottom wall 45 which extends such as to slope down in a direction away from the suction tube portion 12 in a horizontal direction so as to be inserted below the liquid face LS.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a floating oil recovery device.

Conventionally, for example, a floating oil suction device disclosed in Patent Document 1 is known. This floating oil suction device sucks floating oil of a mixed liquid in which a liquid and oil are mixed. The floating oil suction device includes a cylindrical suction nozzle that floats near the surface of the mixed liquid by a specific gravity difference from the mixed liquid or by a float.
The suction nozzle has a top opening and a side opening. The upper surface opening is disposed on the upper surface of the suction nozzle, and sucks bubbles on the surface of the mixed solution. The side opening is arranged on the side of the suction nozzle and sucks floating oil. The foam and the floating oil sucked from the suction nozzle are sucked into the recovery pump via the pipe inside the suction nozzle.

JP-A-2015-54301

  In a 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 reducing the recovery amount (ratio) of liquid such as water and improving the recovery efficiency of floating oil.

  In view of the above circumstances, an object of the present invention is to provide a floating oil recovery device that can increase the recovery efficiency of floating oil.

  One aspect of the floating oil recovery device of the present invention includes a float part floating on a liquid surface, a suction pipe part supported by the float part, and a nozzle part connected to the suction pipe part and arranged on the liquid surface. And a suction source connected to the suction pipe section and suctioning the floating oil of the liquid level from the nozzle section through the suction pipe section, wherein the nozzle section is horizontally separated from the suction pipe section. A bottom wall extending obliquely downward and inserted into the liquid surface;

  According to one aspect of the present invention, the bottom wall of the nozzle portion extends obliquely downward as it goes away from the suction pipe portion in the horizontal direction, and is inserted obliquely with respect to the liquid surface. For this reason, when the liquid such as floating oil and water that has climbed on the bottom wall is sucked obliquely upward along the inclination of the bottom wall, the liquid such as water on the bottom wall is inclined by the inclination of the bottom wall. It is easy to return to the liquid level. Further, the floating oil on the bottom wall can be easily lifted obliquely upward along the inclination of the bottom wall. As a result, the recovery amount (proportion) of the liquid such as water can be reduced, and the recovery efficiency of the floating oil can be increased.

  In the above-described floating oil recovery device, the nozzle unit has a plurality of the bottom walls, and the plurality of the bottom walls are arranged adjacent to each other with a gap therebetween in a direction away from the suction pipe unit in a horizontal direction. Is preferred.

  In this case, since the nozzle portion has a plurality of bottom walls, the separation of the floating oil and the liquid on the bottom wall is further promoted, and the efficiency of collecting the floating oil can be improved. That is, when the floating oil and the liquid are sucked toward the suction pipe portion while passing over the plurality of bottom walls, the liquid is returned to the liquid level between the plurality of bottom walls. That is, the floating oil passes over the plurality of bottom walls and is sucked into the suction pipe portion, but the liquid easily returns to the liquid level between the bottom walls when passing over the plurality of bottom walls. Therefore, the recovery efficiency of the floating oil is further improved.

  In the above-mentioned floating oil recovery device, it is preferable that the bottom wall is supported by the nozzle so as to be movable in a direction in which the bottom wall is inclined with respect to the liquid level.

  In this case, by moving the bottom wall in the direction in which the bottom wall is inclined, for example, in accordance with the state and amount of the floating oil floating on the liquid surface, the position of the bottom wall (in the vertical direction) with respect to the liquid surface can be adjusted. . Thereby, the recovery efficiency of the floating oil can be improved.

  In the above-mentioned floating oil recovery device, it is preferable that the bottom wall has a liquid return groove on an upper surface of the bottom wall.

  In this case, of 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 level through the liquid return groove. Therefore, the recovery efficiency of the floating oil can be further improved.

  In the above-described floating oil recovery device, it is preferable that the suction pipe portion extends in the up-down direction, and the bottom wall has a conical shape that spreads around an axis of the suction pipe portion.

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

  In the above-mentioned floating oil recovery device, it is preferable that the bottom wall has a plurality of oil holding grooves extending in a circumferential direction around the axis, and the plurality of oil holding grooves are arranged in a radial direction orthogonal to the axis.

  In this case, the floating oil riding on the bottom wall is easily retained on the bottom wall by being held by the plurality of oil holding grooves. Further, a liquid such as water having a higher specific gravity than the floating oil accumulates at the groove bottom of the oil holding groove. This liquid can be returned to the liquid level through the circumferential end of the oil holding groove or the like. Therefore, the recovery efficiency of the floating oil is further improved.

  In the above-mentioned floating oil recovery device, it is preferable that the bottom wall has a liquid return groove extending in a radial direction perpendicular to the axis.

  In this case, of 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 level through the liquid return groove. Therefore, the recovery efficiency of the floating oil can be further improved.

  In the above-mentioned floating oil recovery device, the float portion is configured such that a float main body floating on the liquid surface and a portion that supports the float main body and extends in a vertical direction of the suction pipe portion can be adjusted in a vertical direction. And a float support portion to be fixed.

  In this case, the vertical position of 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 setting the vertical position of the bottom wall of the nozzle portion as appropriate, it is possible to make it difficult to suck a liquid such as water from the nozzle portion and to easily suck the floating oil, thereby stably improving the recovery efficiency of the floating oil.

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

It is a top view showing the floating oil collection device of a 1st embodiment. It is a side view (including a partial schematic diagram) showing the floating oil recovery device of a 1st embodiment. It is a side view which shows the nozzle part of the floating oil collection | recovery apparatus of 1st Embodiment. FIG. 7 is a side view showing a first modification of the nozzle unit in FIG. 3. FIG. 10 is a side view showing a second modification of the nozzle unit in FIG. 3. FIG. 14 is a side view showing a third modification of the nozzle unit in FIG. 3. 7A is a plan view, FIG. 7B is a side view, and FIG. 7C is a front view showing a bottom wall member of the nozzle unit in FIG. 6. 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 illustrating a bottom wall member of the nozzle unit in FIG. 8. FIG. 9 is a longitudinal sectional view illustrating a bottom wall member of the nozzle unit in 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 views showing a floating oil recovery device 10 according to the first embodiment.

The floating oil recovery device 10 of the present embodiment is arranged in a separation tank for drainage (drainage) D in a facility such as a factory that manufactures can bodies for two-piece cans.
The discharged liquid D stored in the separation tank is subjected to a 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. The floating oil F has a foamy, liquid or solid part floating 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 section 12, a tube 18, a float section 13, a nozzle section 14, a suction source 17, and a floating oil recovery tank 19.
The suction pipe section 12 is connected to the nozzle section 14 for sucking the floating oil F. The suction pipe section 12 is provided between the nozzle section 14 and a suction source 17 such as a suction pump. The suction pipe portion 12 forms a part of a flow path (pipe) of the suction pipe for sucking the floating oil F. The suction pipe section 12 is a part of the suction pipe (entire) located near the liquid surface LS. The float 13 floats on the liquid level LS. The float part 13 supports the suction pipe part 12 and the nozzle part 14. The nozzle unit 14 is disposed on the liquid level LS. When the water level of the drainage D (the vertical position of the liquid surface LS) fluctuates, the float unit 13 moves in the vertical direction according to the water level. The float section 13 arranges the nozzle section 14 and the suction pipe section 12 in the vicinity of the liquid level LS, regardless of (fluctuations in) the water level of the drainage D.

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

In the horizontal direction, the direction in which the nozzle portion 14 extends is referred to as the front-back direction (X direction). In the front-rear direction, the right side of FIG. 1 is referred to as a front side, and the left side of FIG. 1 is referred to as a rear side.
In the front-rear direction, a direction away from the suction tube 12 is referred to as an outside, and a direction approaching the suction tube 12 is referred to as an inside. That is, in the front-rear direction, the direction from the suction tube 12 to the tip of the nozzle portion 14 is referred to as the outside, and the direction from the tip of the nozzle portion 14 to the suction tube 12 is referred to as the inside.

  A direction orthogonal to the height direction and the front-back direction is referred to as a width direction (Y direction). The width direction is a direction orthogonal to the front-rear direction in the horizontal direction. In the width direction, the upper side in FIG. 1 is referred to as a left side, and the lower side in FIG. 1 is referred to as a right side.

  The above-described height direction (upper side, lower side), front-rear direction (front side, rear side, inside, outside) and width direction (left side, right side) are names for simply describing the relative positional relationship of each part, and Are not limited to the arrangement relationships and the like indicated by these names.

  The suction pipe section 12 is disposed above the liquid level LS and on the liquid level 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 the present embodiment, the suction pipe section 12 is a pipe having a circular cross section (a circular pipe or a round pipe). The suction pipe section 12 is made of, for example, a synthetic resin such as impact-resistant hard polyvinyl chloride (HI-PVC) or vinyl chloride.

  A flexible tube 18 is connected to the upper end of the suction tube 12. The tube 18 is cylindrical. 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 section 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 the floating oil recovery device 10 to move (flow) in the horizontal direction on the liquid level LS. In addition, 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 level LS.

The suction pipe section 12 has a main pipe 21 and a plurality of branch pipes 22.
The main pipe 21 is a part of the suction pipe section 12 that extends upward from the vicinity of the liquid level LS. That is, the main pipe 21 is a portion extending in the up-down direction in the suction pipe section 12. The tube 18 is connected to the upper end of the main pipe 21. The lower end of the main pipe 21 is connected to the branch pipe 22.
In the example of the present embodiment, a pair of branch pipes 22 are provided. The branch pipe 22 is a part of the suction pipe section 12 that branches off from the main pipe 21 near the liquid surface LS and extends in the horizontal direction (the width direction in the present embodiment). The branch pipe 22 is arranged at the liquid level LS and extends along the liquid level 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 sides (left side and right side) in the width direction with the main pipe 21 interposed therebetween. A cap 23 is attached to the tip (end in the width direction) of the branch pipe 22. The cap 23 closes the widthwise end of the branch pipe 22.

  A suction hole 22h opens on 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. The suction hole 22h is disposed at a portion (upper portion) located above the central axis C of the branch pipe 22 in the peripheral wall of the branch pipe 22, and extends in the horizontal direction (the width direction in the present embodiment). A plurality of suction holes 22h (a pair in the example of the present embodiment) are provided in the upper part of the branch pipe 22 at intervals in the front-rear direction. The central axis C of the branch pipe 22 and the suction hole 22h are located above the liquid level LS.

As shown in FIG. 3, when viewed along the central axis C of the branch pipe 22 (as viewed from the central axis C direction), the hole center line HL of the suction hole 22h is inclined with respect to a vertical axis VA passing through the central axis C. The angle θ1 is, for example, 35 to 70 °. The angle θ1 is preferably 45 to 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, the invention is not limited thereto, and the angles θ1 of the pair of suction holes 22h may be different from each other.
The 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 up-down direction, the front-rear direction, and the width direction.

As shown in FIGS. 1 and 2, the float 13 is connected to the main pipe 21 of the suction pipe 12 and floats on the liquid surface LS of the drainage D. In other words, the suction pipe part 12 floats on the liquid surface LS by being supported by the float part 13.
A plurality of float units 13 are provided. In the example of the present embodiment, four float sections 13 are provided, and each of the float sections 13 is connected to the suction pipe section 12. The plurality of float portions 13 are arranged on both sides in the front-rear direction (front side, rear side) and both sides in the width direction (left side, right side) around the main pipe 21. In the 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 section 13 has a float main body 31 floating on the liquid surface LS, and a float support section 32 for supporting the float main body 31.
The float main body 31 is made of, for example, resin and has a lower specific gravity than the drainage liquid D. The float main body 31 is made of a foamed resin such as styrene foam. The float main body 31 may be, for example, a hollow structure having a resin outer shell, or a wooden body. In the example of the present embodiment, the float main body 31 has a barrel shape or a rugby ball shape. The float main bodies 31 arranged on the front side and the rear side of the main pipe 21 extend in the width direction. The float main bodies 31 arranged on the left and right sides of the main pipe 21 extend in the front-rear direction. The float main body 31 has a center hole 31h penetrating the float main body 31 in the horizontal direction (the longitudinal direction of the float main body 31).

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

  Specifically, a through hole is formed in the float support portion 32 so as to penetrate the float support portion 32 in the vertical direction, and the main pipe 21 is inserted into the through hole. The main pipe 21 has an upper stopper 35 disposed above a portion of the float support portion 32 where the through hole is formed and a lower stopper 35 disposed below the portion of the float support portion 32 where the through hole is formed. And a lower stopper 36.

  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 a fixing screw of the upper stopper 35. The upper stopper 35 contacts the float support 32 from above. The upper stopper 35 regulates the upward movement of the float support 32 with respect to the main pipe 21. By loosening the fixing screw of the upper stopper 35 to release the fixing 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 a fixing screw of the lower stopper 36. The lower stopper 36 contacts the float support 32 from below. The lower stopper 36 regulates the downward movement of the float support 32 with respect to the main pipe 21. By loosening the fixing screw of the lower stopper 36 to release the fixing state to the main pipe 21, the float support portion 32 is allowed to move downward with respect to the main pipe 21.
As described above, the float support portion 32 is fixed to the vertically extending portion (main tube 21) of the suction tube portion 12 so that the position in the up and down direction is adjustable.

  The nozzle unit 14 floats on the liquid surface LS of the drainage D and sucks the floating oil F. A plurality of nozzle portions 14 are provided. The nozzle part 14 is provided in each of the plurality of branch pipes 22. In the example of the present embodiment, the number (two) of the nozzle portions 14 is the same as the number (two) of the branch pipes 22. The nozzle portions 14 are provided one by one on a 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 the present embodiment). In the present embodiment, the nozzle portion 14 is made of, for example, stainless steel such as SUS304.

As shown in FIG. 3, the nozzle portion 14 has a mounting portion 41 fixed to the branch pipe 22 and a pair of suction nozzles 42 extending from the mounting portion 41 in the front-rear direction.
The attachment part 41 is plate-shaped. The mounting part 41 covers a part of the branch pipe 22 in the width direction from above. The mounting portion 41 has an arch shape straddling the upper part of the branch pipe 22 in the front-rear direction, and supports a pair of suction nozzles 42 on the front side and the rear side of the branch pipe 22.

The attachment 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 of the outer peripheral surface of the branch pipe 22 by screwing or the like.

  The inclined wall portion 41b is disposed opposite to the suction hole 22h with a gap provided between the inclined wall portion 41b and the suction hole 22h of the branch pipe 22. The inclined wall portion 41b extends obliquely downward toward the outside in the front-rear direction from the connection portion with the fixed wall portion 41a. The inclined wall portion 41b is disposed with a distance of, for example, about 5 to 15 mm between the inclined wall portion 41b and 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 sectional view perpendicular to the central axis C), the distance between the inclined wall portion 41b and the suction hole 22h is equal to the distance of the suction hole 22h. It is smaller than the hole width (opening width). However, the present invention is not limited to this, and the distance between the inclined wall portion 41b and the suction hole 22h may be larger than the hole width of the suction hole 22h, or may be the same.

  The suction nozzle 42 has a tubular shape extending in the horizontal direction. In the example of the present embodiment, the suction nozzle 42 has a rectangular cylindrical shape extending in the front-rear direction. The suction nozzle 42 has a flat rectangular tube shape. The shape of the cross section perpendicular to the front-rear direction of the suction nozzle 42 is a rectangular shape. The cross-sectional shape of the suction nozzle 42 perpendicular to the front-rear direction is a square shape whose length in the width direction is larger than the length in the vertical direction.

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

  The suction nozzle 42 sends the floating oil F to 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 a suction hole 22 h provided on 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 becomes smaller toward the branch pipe 22 side (in the front-rear direction) from the opening located at the end of the suction nozzle 42 on the front end side (outer side in the front-rear direction). The opening area of the cross section perpendicular to the front-rear direction of the suction nozzle 42 becomes smaller toward the branch pipe 22 from the tip end (opening) of the suction nozzle 42.

The suction nozzle 42 has a top wall 43, a side wall 44, and a bottom wall 45. That is, the nozzle unit 14 has the top wall 43, the side walls 44, and the bottom wall 45.
The top wall 43 is a substantially flat plate-shaped part connected to the outer end in the front-rear direction of the mounting portion 41 and extending from the end in the front-rear direction. The top wall 43 extends in a substantially horizontal direction. The end of the top wall 43 on the tip end side (outside in the front-rear direction) extends slightly inclining upward toward the tip end. The top wall 43 is disposed above the liquid level LS. The lower surface of the top wall 43 faces the liquid surface LS from above with a space between the upper surface 43 and the liquid surface LS. The vertical distance between the lower surface of the top 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 provided to be 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 liquid D.

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

The bottom wall 45 extends obliquely downward as it moves away from the branch pipe 22 in the front-rear direction (that is, toward the outside in the front-rear direction). The inner end (base end side) of the bottom wall 45 in the front-rear direction is located above the liquid level LS. The outer end (front end side) of the bottom wall 45 in the front-rear direction is located below the liquid level LS. In the example of the present embodiment, the end on the distal end side of the bottom wall 45 is located at the end on the distal end side of the suction nozzle 42, and forms 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 extends obliquely downward as the distance from the suction pipe portion 12 in the horizontal direction (the front-back direction in the present embodiment) increases, and the liquid surface LS Is inserted into. As described above, since the bottom wall 45 is obliquely inserted 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 level LS (the inclination angle of the bottom wall 45 with respect to the horizontal direction) is, for example, 10 to 25 °. The angle θ2 is preferably 15 to 20 °.
The vertical distance between the bottom wall 45 and the top wall 43 gradually decreases from the opening located at the outer end in the front-rear direction of the suction nozzle 42 toward the inside in the front-rear direction.

  In FIG. 2, the suction source 17 and the floating oil recovery tank 19 are installed outside the separation tank in which the drainage D is stored. The suction source 17 is connected to the suction tube section 12 via a tube 18. The suction source 17 sucks the floating oil F on the liquid surface LS from the nozzle unit 14 through the suction pipe 12 and the tube 18. The floating oil F sucked from the nozzle part 14 is collected in the floating oil collecting tank 19 through the suction pipe part 12 and the tube 18.

Specifically, in the floating oil recovery device 10, when the suction source 17 such as the suction pump is operated, the internal space of the suction nozzle 42 becomes negative pressure in the nozzle portion 14 connected to the suction source 17, and the suction nozzle 42 The drainage D (mainly the floating oil F, the same applies hereinafter) and the outside air near the liquid level LS are sucked from the opening of the nozzle.
The floating oil recovery device 10 sucks the drainage D and the outside air into the suction nozzle 42 and introduces the drainage D into the branch pipe 22 (the suction pipe part 12). That is, the drainage D moves obliquely upward along the inclination 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 obliquely downward toward the lower side as the distance from the suction pipe portion 12 in the horizontal direction increases, and rises to the liquid level LS. It is inserted obliquely with respect to. For this reason, when the liquid such as the floating oil F and the water, etc., riding on the bottom wall 45 is 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 makes it easy to return to the liquid level LS. In addition, the floating oil F on the bottom wall 45 can be easily lifted obliquely upward along the inclination of the bottom wall 45. Thereby, the recovery amount (proportion) of the liquid such as water can be reduced, and the recovery efficiency of the floating oil F can be increased.

Specifically, the floating oil F has a lower specific gravity than a liquid such as water and is located above the liquid, so that it is easy to ride on the bottom wall 45. Further, when the floating oil F rides on the bottom wall 45, it is difficult for the floating oil F to flow obliquely downward due to gravity (it is more likely to stay on the bottom wall 45 than liquid). Then, the floating oil F is easily lifted obliquely upward on the bottom wall 45 by the fluid suction force of the suction source 17. Therefore, the amount of the floating oil F sucked into the branch pipe 22 (recovered amount) increases.
On the other hand, a liquid such as water has a higher specific gravity than the floating oil F and is located below the floating oil F, so that it is difficult to get on the bottom wall 45. Further, even when the liquid rides on the bottom wall 45, the liquid is likely to flow obliquely downward due to gravity (it is difficult to stay on the bottom wall 45). The liquid is unlikely to be lifted 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 (recovered amount) decreases.
As described above, according to the present embodiment, the recovery efficiency of the floating oil F can be increased as compared with the related art.

In the present embodiment, since the angle θ1 is 35 to 70 °, the following operation and effect can be obtained.
Since the angle θ1 is equal to or greater than 35 °, 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 hole 22h.
Since the angle θ1 is equal to or less than 70 °, it is possible to prevent the suction hole 22h from being too close to the liquid level LS. For this reason, it is suppressed that a liquid such as water is directly sucked into the branch pipe 22 from the suction hole 22h without passing over the bottom wall 45.
In addition, in order to make the said effect more remarkable, Preferably, angle (theta) 1 is 45-60 degrees.

In the present embodiment, since the angle θ2 is 10 to 25 °, the following operation and effect can be obtained.
Since the angle θ2 is 10 ° or more, liquid such as water easily flows obliquely downward from above the bottom wall 45. That is, the function of returning the liquid from the bottom wall 45 to the liquid level LS can be stably obtained.
Since the angle θ2 is equal to or less than 25 °, the floating oil F is easily pulled obliquely upward from the bottom wall 45 by the fluid suction force of the suction source 17. That is, the function of sucking and collecting the floating oil F from the bottom wall 45 can be stably obtained.
In addition, in order to make the said effect more remarkable, Preferably, angle (theta) 2 is 15-20 degrees.

In the present embodiment, the float support portion 32 of the float portion 13 is fixed to a vertically extending portion (main tube 21) of the suction tube portion 12 so that the position in the vertical direction can be adjusted.
Thereby, the vertical position of the float part 13 and the suction pipe part 12 can be adjusted, and the vertical position of the nozzle part 14 with respect to the liquid level LS can be adjusted. Therefore, the vertical position of the bottom wall 45 of the nozzle portion 14 with respect to the liquid level LS can be maintained in a favorable state, making it difficult to suck a liquid such as water from the nozzle portion 14 and making it easy to suck the floating oil F. Recovery efficiency can be stably improved.

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

<First Modification>
FIG. 4 is a side view showing a first modified example of the nozzle section 14 (suction nozzle 42) of the floating oil recovery device 10.
In the first modification, the suction nozzle 42 has a bottom wall 46 in addition to the top wall 43, the side walls 44, and the 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 therebetween in a direction away from the suction pipe section 12 in the horizontal direction (the front-rear direction in the present modified example).

In the illustrated example, the suction nozzle 42 has two bottom walls 45 and 46.
Of the two bottom walls 45 and 46, the bottom wall 45 that is connected (contacts) with the peripheral wall of the branch pipe 22 is the first bottom wall 45. The outer end (front end side) of the first bottom wall 45 in the front-rear direction is disposed on the inner side (base end side) in the front-rear direction with respect to the outer end of the suction nozzle 42 in the front-rear direction. The configuration of the first bottom wall 45 other than the above is the same as the bottom wall 45 of the above-described first embodiment.

  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 is bridged between the pair of side walls 44. Both ends in the width direction of the second bottom wall 46 are connected to the pair of side walls 44. The inner end in the front-rear direction of the second bottom wall 46 is arranged away from the peripheral wall of the branch pipe 22 outward in the front-rear direction. The inner end in the front-rear direction of the second bottom wall 46 is located above the outer end of the first bottom wall 45 in the front-rear direction. When viewed from above and below, an inner end of the second bottom wall 46 in the front-rear direction and an outer end of the first bottom wall 45 in the front-rear direction are arranged so as to overlap with each other.

  The second bottom wall 46 extends obliquely downward as it goes outward in the front-rear direction (as it goes away from the suction tube 12 in the horizontal direction), and is inserted into the liquid level LS. The inner end in the front-rear direction of the second bottom wall 46 is located above the liquid level LS. The outer end in the front-rear direction of the second bottom wall 46 is located below the liquid level LS. In the present modification, the outer end (front end side) of the second bottom wall 46 in the front-rear direction is located at the outer end of the suction nozzle 42 in the front-rear direction.

  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 inside 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 runs over 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 inclination angle of the second bottom wall 46 with respect to the horizontal direction) is, for example, 10 to 25 °. The angle θ3 is preferably 15 to 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 modification described above, the same operation and effect as those of the first embodiment can be obtained. Further, since the nozzle portion 14 has the plurality of bottom walls 45, 46, the separation of the floating oil F and the liquid on the bottom walls 45, 46 is further promoted, and the efficiency of collecting the floating oil F can be improved. That is, when the floating oil F and the liquid are sucked toward the branch pipe 22 (the suction pipe section 12) while passing over the plurality of bottom walls 45, 46, the liquid is formed between the plurality of bottom walls 45, 46. Is returned to the liquid level LS. That is, the floating oil F passes over the plurality of bottom walls 45 and 46 and is sucked into the branch pipe 22, but when the liquid passes over the plurality of bottom walls 45 and 46, the liquid flows between the bottom walls 45 and 46. It is easy to return to the liquid level LS. Therefore, the recovery efficiency of the floating oil F is further improved.

Specifically, the drainage D sucked by the suction nozzle 42 is made to pass over two slopes (bottom walls 45 and 46) before reaching the branch pipe 22. At this time, the floating oil F having a small specific gravity easily reaches the branch pipe 22, but the liquid having a large specific gravity returns to the liquid level LS without being able to climb over the two slopes (bottom walls 45 and 46). It is easy to be. That is, the liquid is less likely to be introduced into the branch pipe 22, and the recovery amount 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 increased.

Further, since the angle θ3 is 10 to 25 °, the following operation and effect 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 function of returning the liquid from the second bottom wall 46 to the liquid level LS can be stably obtained.
Since the angle θ3 is equal to or less than 25 °, the floating oil F is easily pulled obliquely upward from above the second bottom wall 46 by the fluid suction force of the suction source 17. That is, the function of sucking and collecting the floating oil F from the second bottom wall 46 can be stably obtained.
In addition, in order to make the said effect more remarkable, Preferably, angle (theta) 3 is 15-20 degrees.

<Second modification>
FIG. 5 is a side view showing a second modified example of the nozzle unit 14 (suction nozzle 42) of the floating oil recovery device 10.
In the second modification, the suction nozzle 42 has a bottom wall member 47 in addition to the top wall 43, the side walls 44, and the 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 (the nozzle unit 14) has a plurality of bottom walls 45 and 48. The plurality of bottom walls 45 and 48 are arranged adjacent to each other with a gap therebetween in the direction (in the present modification, the front-back direction) apart from the suction tube section 12 in the horizontal direction.

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

  The bottom wall member 47 is a plate-shaped member, and is disposed on the first bottom wall 45. The bottom wall member 47 is supported by the nozzle unit 14 so as to be movable in a direction in which the bottom walls 45 and 48 are inclined with respect to the liquid level LS. Specifically, the bottom wall member 47 is inclined with respect to the top wall 43, the side wall 44, and the bottom wall 45 of the suction nozzle 42 in a direction in which the bottom walls 45, 48 are inclined when viewed from the center axis C direction (bottom walls 45, 48). (In the direction in which is extended). Therefore, the bottom wall 48 of the bottom wall member 47 is also supported by the nozzle unit 14 so as to be movable in a direction in which the bottom walls 45 and 48 are inclined with respect to the liquid level LS. That is, the bottom wall 48 is slidable with respect to the top wall 43, the side wall 44, and the bottom wall 45 of the suction nozzle 42 along the direction in which the bottom walls 45, 48 are inclined when viewed from the center axis C direction. .

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

  The inner end in the front-rear direction of the second bottom wall 48 is arranged away from the peripheral wall of the branch pipe 22 outward 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 front-rear outer end of the first bottom wall 45 in the front-rear direction. When viewed from above and below, an inner portion of the second bottom wall 48 along the front-rear direction and an outer portion of the first bottom wall 45 along the front-rear direction are arranged to overlap with each other.

  The second bottom wall 48 extends obliquely downward as it goes outward in the front-rear direction (as it goes away from the suction tube 12 in the horizontal direction), and is inserted into the liquid surface LS. The inner end in the front-rear direction of the second bottom wall 48 is located above the liquid level LS. The outer end in the front-rear direction of the second bottom wall 48 is located below the liquid level LS. In this modification, the outer end (front end side) of the second bottom wall 48 in the front-rear direction is closer to the front outer end of the suction nozzle 42 (the top wall 43, the side wall 44, and the bottom wall 45). Also protrude outward in the front-rear direction.

  The distance in the vertical direction between the second bottom wall 48 and the top wall 43 becomes smaller as going inward 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 runs over the second bottom wall 48.

  The angle θ4 at which the second bottom wall 48 is inclined with respect to the liquid level LS (the inclination angle of the second bottom wall 48 with respect to the horizontal direction) is, for example, 10 to 25 °. Angle θ4 is preferably 15 to 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 center axis C direction, and the angles θ2 and θ4 are the same.

  The pair of ears 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 ears 49 extend downward from both ends in the width direction of the second bottom wall 48. The lower end of the ear 49 is in contact with the upper surface of the first bottom wall 45. The ear portion 49 extends along a direction in which the bottom walls 45 and 48 are inclined with respect to the liquid level LS.

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

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

<Third Modification>
FIG. 6 is a side view showing a third modification of the nozzle unit 14 (suction nozzle 42) of the floating oil recovery device 10. FIGS. 7A to 7C show the sliding wall portion 52 of the bottom wall 50 in FIG.
In the third modification, the suction nozzle 42 has a top wall 43, a side wall 44, and a bottom wall 50. The bottom wall 50 extends obliquely downward as it moves away from the branch pipe 22 (suction pipe section 12) in the horizontal direction (the front-rear direction in this modification) and is inserted into the liquid level LS. The bottom wall 50 has a support wall 51 and a slide wall 52.

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

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

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

The upper surface 52a of the slide wall 52 has a portion parallel to the lower surface 52b of the slide wall 52 and a portion inclined with respect to the lower surface 52b.
A portion of the upper surface 52a of the slide wall portion 52 that is parallel to the lower surface 52b is located inside the slide wall portion 52 in the front-rear direction. For this reason, the inside thickness of the sliding wall portion 52 in the front-rear direction is constant 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 located on an outer portion of the slide wall portion 52 in the front-rear direction. The 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 as it goes outward in the front-rear direction. For this reason, the thickness of the outer portion of the slide wall portion 52 in the front-rear direction decreases as it goes outward in the front-rear direction.

  The slide wall 52 has a liquid return groove 53 on the upper surface 52 a of the slide wall 52. That is, the bottom wall 50 has the liquid return groove 53 on the upper surface 52 a of the bottom wall 50. The liquid return groove 53 is recessed downward on 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. The 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 at an end face facing inward and an end face facing outward of the slide wall portion 52. The liquid return groove 53 is disposed at an intermediate portion located between an inner end and an outer end in the front-rear direction of the slide wall portion 52. The liquid return groove 53 may be opened on at least one of an end face facing inward and an end face facing outward of the slide wall 52.

  In a portion of the upper surface 52a of the slide wall portion 52 that is parallel to the lower surface 52b, the depth of the liquid return groove 53 is constant along the front-rear direction. In a 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 as going outward in the front-rear direction.

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

  The slide wall portion 52 has a screw hole 52d on the side surface 52c. The screw hole 52d is opened in the side surface 52c and recessed in the width direction. A plurality of screw holes 52d are provided on the side surface 52c. The plurality of screw holes 52d are arranged on the side surface 52c in parallel with the lower surface 52b. 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. The screw hole 52d has a female screw portion on the inner peripheral surface of the screw hole 52d. Of the plurality of screw holes 52d, a predetermined (one) screw hole 52d is screwed with a screw member (not shown) passed through the through hole 44a of the side wall 44. Thereby, the slide wall portion 52 is fixed to the suction nozzle 42.

According to the third modification described above, the same operation and effect as those of the first embodiment can be obtained. Further, for example, the bottom wall 50 (slide wall portion 52) is moved in the direction in which the bottom wall 50 (slide wall portion 52 and support wall portion 51) is inclined according to the state and amount of the floating oil F floating on the liquid level LS. By moving, the position (in the vertical direction) of the bottom wall 50 (slide wall portion 52) with respect to the liquid level LS can be adjusted. Thereby, the recovery efficiency of the floating oil F can be improved.
In addition, of 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 level LS through the liquid return groove 53. Therefore, the recovery efficiency of the floating oil F can be further improved.

<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 components as those in the first embodiment are denoted by the same reference numerals, and the description thereof will be omitted, and different points will be mainly described.

As shown in FIGS. 8 to 10, the floating oil recovery device 20 includes a suction pipe section 72, a float section 13, and a nozzle section 74. The floating oil recovery device 20 includes a tube 18, a suction source 17, and a floating oil recovery tank 19.
The suction pipe section 72 is connected to a nozzle section 74 that sucks the floating oil F. The suction pipe section 72 is provided between the nozzle section 74 and the suction source 17. The suction pipe section 72 forms a part of a flow path (pipe) of the suction pipe that suctions the floating oil F. The suction pipe section 72 is a part of the suction pipe (entire) located near the liquid surface LS. The float section 13 supports the suction pipe section 72 and the nozzle section 74. The nozzle part 74 is arranged on the liquid level LS. The float portion 13 moves up and down in accordance with (fluctuations in) the water level of the drainage D, and arranges the nozzle portion 74 and the suction pipe portion 72 near the liquid level LS.

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

The suction pipe section 72 has a main pipe 81.
The main pipe 81 extends in the up-down direction. That is, the main pipe 81 is a portion extending in the up-down direction in the suction pipe section 72. The lower end of the main pipe 81 is located below the liquid level LS. The lower end of the main pipe 81 is arranged near the liquid level LS. Parts other than the lower end of the main pipe 81 (parts located above the lower end) are arranged above the liquid level LS.
In the following description, a direction orthogonal to the axis (center axis) O of (the main pipe 81 of) the suction pipe section 72 is referred to as a radial direction. Of the radial directions, a direction approaching the axis O is referred to as a radial inside, and a direction away from the axis O is referred to as a radial outside. In addition, a direction that rotates around the axis O is referred to as a circumferential direction.

  The main pipe 81 has a suction hole 81h on the peripheral wall of the main pipe 81. The suction hole 81h is a through hole that penetrates the peripheral wall of the main pipe 81, and has an oval shape in the example of the present embodiment. The suction hole 81h is arranged at the lower end of the main pipe 81 and extends in the up-down direction. A plurality of suction holes 81h (four in the example of the present embodiment) are provided at the lower end of the peripheral wall of the main pipe 81 at intervals in the circumferential direction. The plurality of suction holes 81h open at equal intervals in the circumferential direction on the outer peripheral surface of the main pipe 81.

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

  The nozzle 74 is floated (arranged) on the liquid level LS of the drainage D by the float 13 and sucks the floating oil F. The nozzle portion 74 of the present embodiment has an annular opening on the outer periphery of the nozzle portion 74, which is open over the entire circumference around the axis O. The opening of the nozzle portion 74 opens radially on the outer peripheral surface of the nozzle portion 74. The lower end of the opening of the nozzle portion 74 is immersed below the liquid level LS, and portions other than the lower end are exposed on the liquid level LS. That is, the nozzle portion 74 has a portion located below the liquid level LS and a portion located above the liquid level LS. The liquid such as the floating oil F and water on the liquid surface LS can enter the nozzle portion 74 through the opening.

The nozzle part 74 has a top wall member 75 and a bottom wall member 76.
The top wall member 75 has a substantially circular ring plate shape centered on the axis O. The top wall member 75 is disposed above the liquid level LS. The top wall member 75 has a through-hole penetrating the top wall member 75 in the up-down direction. The 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 lower surface of the top wall member 75 has a planar shape perpendicular to the axis O. The lower surface of the top wall member 75 faces the liquid surface LS with a gap. The vertical distance between the lower 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 a 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 top surface of the top wall member 75 has a tapered shape that inclines downward as it goes radially outward.

  The bottom wall member 76 has a substantially disk shape centered on the axis O. The bottom wall member 76 is fixed to the lower end of the main pipe 81. The bottom wall member 76 is disposed apart from the top wall member 75 downward (with a gap). The upper end of the bottom wall member 76 is arranged above the liquid level LS, and the parts other than the upper end (parts located below the upper end) are arranged below the liquid level LS. The space between the top wall member 75 and the bottom wall member 76 is the internal space of the nozzle part 74.

The bottom wall member 76 has a bottom wall 77, an oil holding hole 78, and a pipe 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 that spreads around the axis O of the suction pipe section 72. The bottom wall 77 extends obliquely downward as it moves away from the suction pipe section 72 in the horizontal direction (in the present embodiment, in the radial direction), and is inserted into the liquid surface LS. A radially inner end of the bottom wall 77 is located above the liquid level LS. A radially inner end of the bottom wall 77 is disposed close to a suction hole 81h of the main pipe 81. The radially outer end of the bottom wall 77 is located below the liquid level LS. The radially outer end of the bottom wall 77 is connected to the upper end of the outer peripheral surface of the bottom wall member 76.
As described above, since the bottom wall 77 is obliquely inserted 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 inclination angle of the bottom wall 77 with respect to the horizontal direction) is, for example, 10 to 25 °. The angle θ5 is preferably 15 to 20 °.
The vertical distance between the bottom wall 77 and the lower surface of the top wall member 75 becomes smaller as it goes radially inward from the opening located at the radially outer end of the nozzle portion 74.

The bottom wall 77 has an oil holding groove 82 and a liquid return groove 83.
A plurality of oil holding grooves 82 are provided on the bottom wall 77. The oil holding groove 82 is recessed downward on 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 oil retaining groove 82 has a V-shaped cross section (a cross section perpendicular to the circumferential direction). The groove width of the oil holding groove 82 is constant along the circumferential direction. The groove depth of the oil holding groove 82 is constant along the circumferential direction.

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

  A plurality of liquid return grooves 83 are provided on the bottom wall 77. The liquid return groove 83 is recessed downward on the bottom wall 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 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 has a planar shape perpendicular to the axis O. The groove depth of the liquid return groove 83 becomes smaller as going outward in the radial direction. The groove depth of the liquid return groove 83 is larger than the groove depth of the oil holding groove 82.

  The plurality of liquid return grooves 83 are arranged at intervals in the circumferential direction. In the example of the present embodiment, a plurality (eight in the example shown) of liquid return grooves 83 are arranged at equal intervals in the circumferential direction. The liquid return groove 83 is arranged so as to divide the oil holding groove 82 in the circumferential direction. The circumferential end of the oil holding groove 82 is connected to the liquid return groove 83. That is, the inside of the oil holding groove 82 communicates with the inside of the liquid return groove 83. The upper part of the liquid return groove 83 is disposed above the liquid level LS, and the lower part is disposed below the liquid level LS.

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

  The pipe fixing hole 79 is a bottomed hole that is recessed downward from the bottom surface of the oil holding hole 78. The pipe fixing hole 79 opens at the center of the bottom surface of the oil holding hole 78. The tube fixing hole 79 is a circular hole. The inside diameter of the pipe fixing hole 79 is smaller than the inside diameter of the oil holding hole 78. The lower end of the main pipe 81 is inserted into and fixed to the pipe fixing hole 79. The pipe fixing hole 79 also functions as a cap for closing 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 drainage D (near the liquid level LS from the opening of the nozzle portion 74 ( Mainly floating oil F, the same applies hereinafter) and outside air.
The floating oil recovery device 20 sucks the drainage D and the outside air into the nozzle part 74 and introduces the same into the main pipe 81 (suction pipe part 72). That is, the drainage D moves obliquely upward along the inclination 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 the present embodiment described above, the same functions and 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 section 72, the nozzle section 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 improved.

Further, in the present embodiment, since the bottom wall 77 has a plurality of oil holding grooves 82 extending in the circumferential direction, and the plurality of oil holding grooves 82 are arranged in the radial direction, the following operational effects can be obtained.
In this case, the floating oil F riding on the bottom wall 77 is easily retained on the bottom wall 77 by being held by the plurality of oil holding grooves 82. At the bottom of the oil holding groove 82, a liquid such as water having a higher specific gravity than the floating oil F accumulates. This liquid can be returned to the liquid level LS through a 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.

In the present embodiment, since the bottom wall 77 has the liquid return groove 83 extending in the radial direction, the following operation and effect 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 level LS through the liquid return groove 83. Therefore, the recovery efficiency of the floating oil F can be further improved.

In the present embodiment, since the angle θ5 is 10 to 25 °, the following operation and effect can be obtained.
Since the angle θ5 is 10 ° or more, liquid such as water easily flows obliquely downward from above the bottom wall 77. That is, the effect of returning the liquid from the bottom wall 77 to the liquid level LS can be stably obtained.
Since the angle θ5 is equal to or less than 25 °, the floating oil F is easily pulled obliquely upward from the bottom wall 77 by the fluid suction force of the suction source 17. That is, the function of sucking and collecting the floating oil F from the bottom wall 77 can be stably obtained.
In addition, in order to make the said effect more remarkable, Preferably, angle (theta) 5 is 15-20 degrees.

  Note that the present invention is not limited to the above-described embodiment. For example, as described below, a configuration change or the like can be made without departing from the spirit of the present invention.

  In the above-described embodiment, an example has been given in which the bottom wall extends linearly in a longitudinal sectional view of the nozzle portion, but the present invention is not limited to this. In a longitudinal 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 flat shape but may be a curved shape.

  Any of the angles θ1 to θ5 that are the inclination angles of the bottom wall may be changeable by adjusting the mounting angle of the bottom wall. That is, the angles θ1 to θ5 may be adjustable in the respective numerical ranges of the angles θ1 to θ5. That is, the inclination of the bottom wall with respect to the liquid level LS may be changeable.

  The nozzle portion may extend downward and incline as it moves away from the suction tube portion in the horizontal direction, and may have a bottom wall inserted into the liquid level LS. The shape and structure of the nozzle portion are as follows. The present invention is not limited to the example described in the above embodiment.

  In addition, the components (components) described in the above-described embodiments, modifications, and the like may be combined without departing from the spirit of the present invention. Changes are possible. The present invention is not limited by the above-described embodiments, but is limited only by the scope of the claims.

  According to the floating oil recovery device of the present invention, the recovery efficiency of floating oil can be increased. Therefore, it has industrial applicability.

  10, 20: floating oil recovery device, 12, 72: suction pipe portion, 13: float portion, 14, 74: nozzle portion, 17: suction source, 21, 81: main pipe (portion extending in the vertical direction of the suction pipe portion) ), 31: float body, 32: float support, 45, 46, 48, 50, 77: bottom wall, 52a: top surface, 53, 83: liquid return groove, 82: oil holding groove, F: floating oil, LS ... liquid level, O ... axis

Claims (8)

A float part floating on the liquid surface,
A suction pipe section supported by the float section,
A nozzle unit connected to the suction tube unit and arranged on the liquid surface,
A suction source that is connected to the suction pipe section and suctions floating oil on the liquid surface from the nozzle section through the suction pipe section;
The floating oil recovery device, wherein the nozzle portion extends obliquely downward as it goes away from the suction pipe portion in the horizontal direction, and has a bottom wall inserted into the liquid surface. The floating oil recovery device according to claim 1,
The nozzle unit has a plurality of the bottom walls,
The floating oil collecting device, wherein the plurality of bottom walls are arranged adjacent to each other with a gap therebetween in a direction away from the suction pipe portion in the horizontal direction. The floating oil recovery device according to claim 1 or 2,
The floating oil recovery device, wherein the bottom wall is supported by the nozzle portion so as to be movable in a direction in which the bottom wall is inclined with respect to the liquid level. It is a floating oil recovery device according to any one of claims 1 to 3,
The floating oil recovery device, wherein the bottom wall has a liquid return groove on an upper surface of the bottom wall. The floating oil recovery device according to claim 1,
The suction tube portion extends vertically,
The floating oil recovery device, wherein the bottom wall has a conical shape that spreads around an axis of the suction pipe portion. The floating oil recovery device according to claim 5,
The bottom wall has a plurality of oil holding grooves extending in a circumferential direction around the axis,
A floating oil recovery device, wherein the plurality of oil holding grooves are arranged in a radial direction orthogonal to the axis. The floating oil recovery device according to claim 5 or 6,
The floating oil recovery device, wherein the bottom wall has a liquid return groove extending in a radial direction perpendicular to the axis. The floating oil recovery device according to any one of claims 1 to 7,
The float unit,
A float body floating on the liquid surface,
A floating oil recovery device, comprising: a float supporting portion that supports the float main body and that is fixed to a vertically extending portion of the suction pipe portion so that the vertical position is adjustable.

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