JP7448269B1 - Oil-water separation equipment and oil-water separation method - Google Patents

Abstract

An object of the present invention is to provide an oil/water separator that is smaller in size and has higher separation accuracy. An oil-water separator 1 has a first separation tank 2 into which a liquid to be separated 91 flows, and a bottom surface located at a higher position than the bottom surface of the first separation tank, and a first separation tank 2 that overflows on a side wall surface of the first separation tank. The second separation tank 3 is provided with a flow path partition plate 31 that forms a flow path into which the upper layer liquid of the first separation tank flows and through which the flowed upper layer liquid of the first separation tank is turned around and flows. [Selection diagram] Figure 1

Description

The present invention relates to an oil-water separation device and an oil-water separation method.

In the fields of industrial processes and environmental conservation, oil-water separators are used to separate liquids that are a mixture of oil and water. For example, in factories that use machine tools, oil such as hydraulic oil and lubricating oil mixed in cutting oil and cleaning fluid (hereinafter referred to as "water-soluble coolant, etc.") used in machine tools is removed, and water-soluble coolant, etc. An oil-water separator that recycles and utilizes oil is used.

Patent Document 1 discloses a tank consisting of a plurality of separation chambers partitioned in series by a plurality of vertical partition plates, and an oil-water mixed liquid inlet to be treated is provided on the most upstream wall of the tank. The through holes provided in the partition plate are located gradually lower from upstream to downstream, and are arranged in a staggered manner, and the most downstream separation chamber is provided with a discharge pipe that opens on the bottom surface thereof. It discloses an oil-water separation tank characterized by the following characteristics (Patent Document 1, Figs. 1 and 2).

Patent Document 2 discloses that a liquid tank 1 is partitioned by a plurality of partition walls 21 to 23 into which a liquid mixture of oil and a liquid with a higher specific gravity is introduced and the oil rises to near liquid levels L1 to L3 and is separated. A plurality of recovery chambers C1 to C3 are formed, and the cleaning liquid discharge pipes 41 to 43 are raised upward from the side walls of each recovery chamber C1 to C3 to a predetermined height position to discharge the liquid in each recovery chamber C1 to C3. It discloses determining the surface height and overflowing the mixed liquid other than near the liquid levels L1 to L3 as a cleaning liquid (Patent Document 2, FIG. 2).

Publication No. 50-33872 Japanese Patent Application Publication No. 2000-135404

For example, in factories where many machine tools are operating at full capacity, water-soluble coolant mixed with hydraulic oil or lubricating oil (hereinafter referred to as "oil-water mixture") is generated on a daily basis, and oil-water separators are constantly being used. It is thought that there is an opportunity to use recycled water-soluble coolant.

However, factories with many machine tools, including small factories, rarely generate the amount of oil-water mixture that would be recycled and used on a daily basis. Space-consuming oil-water separators were not installed, and the oil-water mixture was often discarded without being recycled.

However, from the perspective of sustainability, there is a demand for efficient oil-water separation and recycling as much as possible, even if the amount of oil-water mixture is small, once a certain amount is collected. On the other hand, in order to recycle and utilize it, the liquid after oil and water separation must have sufficient quality as a water-soluble coolant, and high separation accuracy is required.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an oil-water separator and an oil-water separation method that perform oil-water separation with high separation accuracy while saving space.

The oil-water separator of the present disclosure includes a first separation tank into which a liquid to be separated flows, a bottom surface at a position higher than a bottom surface of the first separation tank, and the liquid to be separated that overflows on a side wall surface of the first separation tank. and a second separation tank having a flow path partition plate forming a flow path into which the upper layer liquid of the first separation tank flows and which turns and flows the flowed upper layer liquid of the first separation tank. .

Further, in the oil-water separator of the present disclosure, the first separation tank is arranged on the upstream side of the first separation tank, which is the side where the liquid to be separated flows in and the liquid in the upper layer of the first separation tank overflows. and a first communication partition plate forming a downstream side by partitioning off a part near the bottom of the first separation tank, and causing the lower layer liquid of the first separation tank flowing into the downstream side of the first communication partition plate to overflow. and a first water level adjustment part that adjusts the water level, the second separation tank having a part near the bottom of the second separation tank vacant at the downstream end of the flow path of the second separation tank. It may also include a second communication partition plate that partitions the second communication partition plate, and a second water level adjustment unit that adjusts the water level while overflowing the lower layer liquid of the second separation tank that flows into the downstream side of the second communication partition plate.

Further, in the oil-water separator of the present disclosure, a first separated water ring water inlet that causes the first separated water that overflowed in the first water level adjustment section to join with the second separated water that overflowed in the second water level adjustment section; It is also possible to further include a common ring water port that circulates the second separated water and the combined first separated water.

Furthermore, in the oil-water separator of the present disclosure, the second separation tank may further include an oil drain port provided on the same side wall surface as the common ring water port, with the second communication partition plate interposed therebetween. .

Further, in the oil-water separator of the present disclosure, the first water level adjustment section is a pipe that extends from near the bottom of the first separation tank and has an upper end at the height of the overflow on the downstream side of the first communication partition plate. By having a certain first separation tank water level adjustment pipe, a side wall surface surrounding the upper end of the first separation tank water level adjustment pipe, and a bottom surface through which the first separation tank water level adjustment pipe penetrates, the overflow A first separated water container for receiving the first separated water may be included.

Further, in the oil-water separator of the present disclosure, the second water level adjustment section is a pipe that extends from near the bottom of the second separation tank and has an upper end at the height of the overflow on the downstream side of the second communication partition plate. By having a certain second separation tank water level adjustment pipe, a side wall surface surrounding the upper end of the second separation tank water level adjustment pipe, and a bottom surface through which the second separation tank water level adjustment pipe penetrates, the overflow It may also have a second separated water container that receives the second separated water.

Moreover, in the oil-water separator of the present disclosure, the overflow of the upper layer liquid of the first separation tank is carried out on an integral side wall surface that is a mutually adjacent side wall surface or a common side wall surface of the first separation tank and the second separation tank. The first communication partition plate and the flow path partition plate each extend from the integral side wall surface, and the first separated water is separated from the position where the upper layer liquid of the first separation tank overflows. The water may flow into the second separation tank via the integrated side wall surface on the opposite side of the first communication partition plate, thereby joining the second separated water.

The oil-water separator of the present disclosure may further include a cylindrical magnet placed upstream of the first communication partition plate of the first separation tank.

Moreover, in the oil-water separator of the present disclosure, each side wall of the second separation tank may be formed of a transparent material.

Moreover, in the oil-water separator of the present disclosure, the first separation tank and the second separation tank may each have a lid made of a transparent material.

Further, in the oil-water separator of the present disclosure, the bottom area of the second separation tank is at least twice the bottom area of the first separation tank, and the water depth of the first separation tank is greater than the bottom area of the second separation tank. The water depth may be twice or more than the water depth.

The oil-water separator of the present disclosure may further include a pump that is disposed in a space directly below the second separation tank and that sends the liquid to be separated to the first separation tank.

In the oil-water separation method of the present disclosure, a liquid to be separated flows into a first separation tank, and overflows on a side wall surface of the first separation tank into a second separation tank having a bottom at a higher position than the bottom of the first separation tank. An oil-water separation method in which an upper layer liquid in a first separation tank, which is the liquid to be separated, flows in the second separation tank, and the upper liquid in the first separation tank flows back through a flow path formed by a flow path partition plate in the second separation tank. It is.

Further, in the oil-water separation method of the present disclosure, the lower layer liquid of the first separation tank that has moved to the downstream side of the first communication partition plate partitioned by leaving a part near the bottom of the first separation tank is transferred to the first separation tank. A second separation that overflowed as water and moved to the downstream side of a second communication partition plate partitioned by leaving a part near the bottom of the second separation tank at the downstream end of the flow path of the second separation tank. The tank lower layer liquid may overflow as second separated water, and the overflowed first separated water and second separated water may be recycled through a common water recycling port.

According to the oil-water separator and oil-water separation method of the present disclosure, oil-water separation can be performed with high separation accuracy while saving space.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view from the direction which can visually recognize the front, left side, and top surface of the oil-water separator based on one Embodiment of this invention. FIG. 1 is a front view of an oil-water separator according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing the flow of liquid two-dimensionally (with the lateral direction of the paper as the XY direction) in order to explain the oil-water separation function in the first separation tank and the second separation tank. FIG. 2 is a schematic view of the first separation tank and the second separation tank viewed from above, and is for explaining the flow of liquid. FIG. 7 is a perspective view showing another example of the first separation tank. It is a perspective view from the direction which can visually recognize the front and right side of the oil-water separator concerning other embodiments of the present invention. It is a perspective view from the direction which can visually recognize the back side and left side of the oil-water separator concerning other embodiments of the present invention. FIG. 8 is a perspective view showing an example of use of the oil-water separator according to the embodiment of FIGS. 6 and 7. FIG.

Hereinafter, the oil-water separator of the present disclosure will be described with reference to the drawings. In the description, similar elements are given the same reference numerals, and redundant description will be omitted as appropriate. Arrows indicated by XYZ in the drawings indicate the directions of the coordinate axes and are shown to make the field of view of the drawings easier to understand.

FIG. 1 is a perspective view of an oil-water separator 1 according to an embodiment of the present invention, taken from a direction in which the front, left side, and top surface can be seen, and FIG. 2 is a front view of the oil-water separator 1. FIG. 3 is a schematic diagram showing the flow of liquid two-dimensionally (with the lateral direction on the paper as the XY direction) in order to explain the oil-water separation function in the first separation tank 2 and the second separation tank 3.

As shown in FIGS. 1 and 2, the oil-water separator 1 includes a first separation tank 2 and a second separation tank 3. In this embodiment, the first separation tank 2 and the second separation tank 3 have different rectangular parallelepiped shapes, and the second separation tank 3 is in contact with a part of the side surface of the first separation tank 2. ing. However, the configuration is not limited to this, and the first separation tank 2 and the second separation tank 3 may have a shape other than a rectangular parallelepiped, such as having some rounded corners, or the first separation tank 2 and the second separation tank 3 There may be a distance between the separation tank 3 and the separation tank 3. In the oil-water separator 1, the liquid to be separated 91 (see FIG. 3) flows into the first separation tank 2, and the separated liquid is discharged from the second separation tank 3. The liquid to be separated inlet 24 indicated by a dashed line in FIG. 1 is a virtual inlet for explanation, and shows an example of the position of the liquid to be separated inlet 24.

Here, the second separation tank 3 has a bottom surface located higher than the bottom surface of the first separation tank 2, and the first separation tank upper layer liquid 93 is the liquid to be separated 91 that overflows on the side wall surface of the first separation tank 2. (See FIG. 3) has a flow path partition plate 31 that forms a flow path through which the upper layer liquid 93 of the first separation tank that has flowed in is turned back and allowed to flow. Here, "overflow at the side wall surface" includes not only overflow at the upper end of the side wall surface, but also overflow from a hole made in the side wall surface (first separation tank upper layer liquid outlet 25 in this embodiment). . In addition, in this embodiment, the flow path partition plate 31 that forms the flow path is one piece, but for example, the flow path partition plate 31 may further include a flow path partition plate 31 extending in the vertical direction (Y direction). By adding it, a meandering flow path may be formed.

Here, since the second separation tank 3 is arranged downstream of the first separation tank 2, the water level in the second separation tank 3 is lower than the water level in the first separation tank 2. Furthermore, since the height of the bottom of the second separation tank 3 is higher than the bottom of the first separation tank 2, as a result, the water depth of the second separation tank 3 is set to be shallower than the water depth of the first separation tank 2. be done. In other words, the oil-water separator 1 includes a deeper first separation tank 2 and a shallower second separation tank 3 in which a flow path is formed.

Since the first separation tank 2 has a depth, when the liquid to be separated 91 is an oil-water mixture, the aqueous phase with a high water content can be collected near the bottom of the first separation tank 2 in a short time. The resulting first separation tank lower layer liquid 92 (see FIG. 3) can be efficiently reused as the first separated water 96 (see FIG. 3). In addition, in the shallower second separation tank 3, the upper layer liquid 93 of the first separation tank with a low water content is separated by the flow path formed by the flow path partition plate 31 due to the difference in specific gravity over a distance and time. Therefore, even with a compact configuration, separation can be performed with high precision, and the separated water can be reused.

With such a configuration, when the liquid to be separated 91 is an oil-water mixture, the oil contained in the oil-water mixture can be efficiently removed and the separated water can be recycled. Note that the second separation tank upper layer liquid (separated oil) 95 may be recycled and utilized (alone or together with separated water).

Furthermore, in the oil-water separator 1 of the present embodiment, the bottom area of the second separation tank 3 is larger than the bottom area of the first separation tank 2, and the water depth of the first separation tank 2 is set to the second separation tank 3. can be greater than the depth of the water. More preferably, the bottom area of the second separation tank 3 is at least twice the bottom area of the first separation tank 2, and the water depth of the first separation tank 2 is at least twice the water depth of the second separation tank 3. good. Here, "water depth" means the (vertical) distance from the bottom of the tank to the overflow water level in each separation tank. With this configuration, since the first separation tank 2 is a deeper separation tank, separation due to differences in specific gravity can be performed in a shorter time with high separation accuracy, and the separation water can be efficiently separated. A recyclable first separation tank lower layer liquid 92 can be generated. In addition, in the second separation tank 3, by utilizing the flow path formed by the flow path partition plate 31, it is possible to perform separation based on the difference in specific gravity over a longer distance and time. Even if it is a mixed liquid, the second separation tank lower layer liquid 94, which is separated water with high separation accuracy, can be generated.

Further, the first separation tank 2 has a bottom surface of the first separation tank 2 with respect to the upstream side of the first separation tank 2, which is the side where the liquid to be separated 91 flows in and the first separation tank upper layer liquid 93 overflows. A first communication partition plate 21 that forms a downstream side by leaving a part of the vicinity open, and a first communication partition plate 21 that allows the lower layer liquid 92 of the first separation tank flowing into the downstream side of the first communication partition plate 21 to overflow and adjusts the water level. 1 water level adjustment section 22. The second separation tank 3 also has a second communication partition plate 32 that partitions the second separation tank 3 by leaving a part near the bottom of the second separation tank 3 at the downstream end of the flow path of the second separation tank 3; The second separation tank lower layer liquid 94 flowing into the downstream side of the second separation tank 32 may be overflowed, and may include a second water level adjustment section 33 that adjusts the water level.

Here, "near the bottom" means closer to the bottom than the center between the liquid level and the bottom. The first communication partition plate 21 may be arranged at a distance from the bottom surface to form the first communication port 211, or may be a plate with holes near the bottom surface so that the holes are located at the same distance. The first communication port 211 may also be formed. The second communication partition plate 32 may also be arranged at a distance from the bottom surface to form the second communication port 321, or it may be a plate with holes near the bottom surface to form the second communication port 321. A second communication port 321 may be formed at the position. The first communication partition plate 21 and the second communication partition plate 32 allow only separated water from which oil has been sufficiently removed to flow into the downstream side of the partition plate when the liquid to be separated 91 is an oil-water mixture. Moreover, the overflow configuration allows defining the water level necessary for oil-water separation in each separation tank.

The oil-water separator 1 also includes a first separated water ring water port 23 that allows the first separated water 96 that overflowed in the first water level adjustment section 22 to merge with the second separated water 97 that overflowed in the second water level adjustment section 33; It may further include a common ring water port 34 for recycling the second separated water 97 and the combined first separated water 96.

Here, "merging" means that the first separated water 96 flows in the area where the second separated water 97 flows, and the first separated water 96 and the second separated water 97 do not actually have to join. . In this way, by circulating the first separated water 96 and the second separated water 97 through the same common ring water port 34, there is only one ring water port, and separate hoses and pipes are required for each. Therefore, the entire device can be made more compact.

The second separation tank 3 may further include an oil drain port 35 provided on the same side wall surface as the common ring water port 34 with the second communication partition plate 32 in between. Here, the oil drain port 35 may be, for example, attached with a manual valve so that it can be opened and closed, or may be of a shooter type having a large sloped opening that can drain even if solids such as sludge are contained therein. Other configurations are possible. Further, the oil discharged through the oil drain port 35 may be recycled. By discharging the separated oil 95 through the oil drain port 35, the amount of oil in the second separation tank 3 can be reduced, thereby increasing the separation accuracy of the second separation tank lower layer liquid 94 and the second separated water 97. Can be done.

The first water level adjustment section 22 includes a first separation tank water level adjustment pipe 221 that extends from near the bottom of the first separation tank 2 and has an upper end at the height of the overflow on the downstream side of the first communication partition plate 21; The first separated water receives the overflowed first separated water 96 by having a side wall surface surrounding the upper end of the first separation tank water level adjustment pipe 221 and a bottom surface through which the first separation tank water level adjustment pipe 221 penetrates. It may have a container 222 for use. Here, the side wall surface of the first separated water container 222 may be configured by the side wall surface of the first separation tank 2 or the first communication partition plate 21. The first separated water container 222 may have a first separated water ring water opening 23 .

Here, the term "upper end" means the upper end of an extending tube without holes, and the position of the hole when there is a hole through which the liquid in the tube flows out. With such a configuration, it is possible to suppress oil that accidentally enters the downstream side of the first communication partition plate 21 from being recycled. The first water level adjustment section 22 is not limited to such a configuration, and may have other configurations such as overflowing on the side wall surface of the first separation tank 2, for example.

Further, the second water level adjustment section 33 includes a second separation tank water level adjustment pipe 331 which is a pipe that extends from near the bottom of the second separation tank 3 and whose upper end is at the height of the overflow on the downstream side of the second communication partition plate 32. , a side wall surface surrounding the upper end of the second separation tank water level adjustment pipe 331 , and a bottom surface through which the second separation tank water level adjustment pipe 331 penetrates, so that the second separation tank receives the overflowing second separated water 97 . The separated water container 332 may also be included. Here, the side wall surface of the second separated water container 332 may be configured by the side wall surface of the second separation tank 3 or the second communication partition plate 32. Further, the second separated water container 332 may have a common ring water port 34.

Here, as in the case of the first water level adjustment part 22, the "upper end" means the upper end if the pipe is extending without holes, and if there is a hole midway through which the liquid in the pipe flows out, It means the position of the hole. By forming the bottom surface (lower surface) of the second separated water container 332, the lower edge of the second communication partition plate 32, and the lower edge of the second separation tank water level adjustment pipe 331 on the same plane, the second separation Water 97 can be efficiently recovered. The second water level adjustment section 33 is not limited to such a configuration, and may have other configurations such as, for example, providing a new partition plate extending from the bottom of the second separation tank 3 to allow overflow.

Here, the overflow of the first separation tank upper layer liquid 93 is performed via the integral side wall surface 8 which is the mutually adjacent side wall surfaces of the first separation tank 2 and the second separation tank 3 or the common side wall surface. Good too. In this case, the first communication partition plate 21 and the channel partition plate 31 each extend from the integrated side wall surface 8, and the first separated water 96 is located at a position where the first separation tank upper layer liquid 93 overflows. The water may flow into the second separation tank 3 via the integrated side wall surface 8 on the opposite side of the first communication partition plate 21, thereby merging with the second separated water 97.

Here, the "integrated side wall surface 8" is not limited to a structure made of a single plate material or a structure in which a plurality of plate materials are lined up in contact with each other, and the overflow of the first separated mixed liquid flows into the second separation tank 3. The first separation tank 2 and the second separation tank 3 may include respective side wall surfaces of the first separation tank 2 and the second separation tank 3 connected by a channel configured to do so. The first separated water 96 is generated through the integrated side wall surface 8 at a position close to the area where the second separated water 97 is generated, so the structure can be simplified without using additional hoses or pipes. Since it can be combined with the second separated water 97, a more compact configuration can be achieved.

Moreover, each side wall of the second separation tank 3 may be formed of a transparent material. By making each side wall transparent, the state of separation can be visually checked. Thereby, depending on the visually confirmed state, the inflow amount of the liquid to be separated 91 can be adjusted, and a highly accurate separation state can be maintained. Further, if a manual valve is provided in the oil drain port 35, the timing of opening and closing of the oil drain port 35 can be easily recognized.

Next, oil-water separation by the oil-water separator 1 will be described using FIG. 3, which two-dimensionally and schematically shows the flow of liquid. First, the liquid to be separated 91 flows into the first separation tank 2 via the liquid to be separated inlet 24 (F1). Among the liquids to be separated 91, the first separation tank upper layer liquid 93, which has a relatively small specific gravity, moves upward in the first separation tank 2 and forms the first layer on the side wall surface (integrated side wall surface 8) of the first separation tank 2. It overflows at the separation tank upper layer liquid outlet 25 and flows into the second separation tank 3 (F21). The first separation tank upper layer liquid 93 that has flowed into the second separation tank 3 flows along the flow path formed by the flow path partition plate 31, and oil-water separation due to the difference in specific gravity is performed over time (F22). At the downstream end of the flow path of the second separation tank 3, the second separation tank lower layer liquid 94 containing a large amount of water with a relatively high specific gravity that has sunk near the bottom passes through the second communication port 321 (F23) and reaches the second water level. The water overflows in the adjustment section 33 (F24) and is recycled as second separated water 97 at the common ring water port 34. Further, at the downstream end of the flow path of the second separation tank 3, the second separation tank upper layer liquid (separated oil) 95 containing a large amount of oil and having a relatively low specific gravity is drained through the oil drain port 35.

On the other hand, of the liquid to be separated 91, the first separation tank lower liquid 92, which contains a large amount of water with a relatively high specific gravity, passes through the first communication port 211 (F11) and overflows in the first water level adjustment section 22 (F12). ). The first separated water 96 that has overflowed in the first water level adjustment section 22 passes through the first separated water ring water port 23 on the side wall surface (integrated side wall surface 8) of the first separation tank 2 (F13), and then passes through the second separated water It joins with the water 97 and is recycled at the common ring water port 34.

FIG. 4 is a schematic diagram viewed from the top of the first separation tank 2 and the second separation tank 3, and is for explaining the flow of liquid. As shown in this figure, in the oil-water separator 1 according to the present embodiment, when the liquid to be separated 91 flows into the first separation tank 2 (F1), the upper layer liquid 93 of the first separation tank is It moves clockwise (F21 to F24) and is recycled as second separated water 97 (F2). On the other hand, the first separation tank lower layer liquid 92 moves clockwise (F11 to F13) and is recycled as first separated water 96 (F2). In this way, the first separated water 96 that is separated in a short time on a short path is separated from the area (separated by the integrated side wall surface 8) where the second separated water 97 that is separated on a long path for a long time is generated. Since it is generated adjacently, the water can be recycled through the same common water outlet 34 as the second separated water 97, and a more compact configuration can be achieved without additionally using separate hoses or pipes. Furthermore, since the oil drain port 35 can be formed on the same side as the common ring water port 34, the output side can be unidirectional, and space can be saved even during use.

FIG. 5 is a perspective view showing another example of the first separation tank 2. As shown in this figure, the first separation tank 2 may further include a cylindrical magnet 27 placed upstream of the first communication partition plate 21 of the first separation tank 2. With such a configuration, metal pieces such as sludge can be adsorbed immediately after the liquid to be separated 91 flows in, and there is a possibility that the metal pieces, such as sludge, will be mixed with the first separation tank upper liquid 93 and the first separation tank lower liquid 92. Can remove certain metal solids. Thereby, oil-water separation can be performed with higher precision. Furthermore, by making the magnet 27 cylindrical, it is possible to attract metal pieces by utilizing the large area of the side surface of the cylinder. Furthermore, by placing the cylinder so as to extend from near the bottom toward the liquid surface, it is possible to adsorb not only metal pieces that sink, but also metal pieces that float due to adhesion of oil, air, etc. Note that large metal pieces may be separated by a strainer 7 or the like, which will be described later, before flowing into the first separation tank 2.

6 and 7 are diagrams of other embodiments of the oil/water separator 1. FIG. 6 is a perspective view of the oil/water separator 1 from a direction in which the front and right sides can be viewed, and FIG. 7 is a diagram of the oil/water separator 1. FIG. 2 is a perspective view from a direction in which the back and left side of the separation device 1 can be visually recognized.

As shown in FIGS. 6 and 7, the oil-water separator 1 of this embodiment includes, in addition to the first separation tank 2 and the second separation tank 3, an air separation section 4, a pump storage section 5, a pump 6, and a strainer. 7. It has a pump upstream hose 15 and a pump downstream hose 16.

The pump upstream hose 15 is connected to an inlet of the pump 6 and an outlet of the strainer 7 . The pump downstream hose 16 is connected to an outlet of the pump 6 and an inlet of the air separation section 4 . The pump 6 is disposed in the pump storage section 5 disposed below the second separation tank 3, and by forming negative pressure, the strainer is pumped from the end of a hose (not shown) connected to the strainer inlet 71. A liquid to be separated (for example, an oil-water mixture) 91 is sucked in through the pump 7 and the pump upstream hose 15 . The strainer 7 removes solid matter, such as large metal pieces such as sludge, from the liquid to be separated 91 that flows in from the strainer inlet 71 so as not to affect the driving of the pump 6 .

The air separation unit 4 uses a baffle plate (not shown) or the like to separate as much air as possible from the oil/water mixture that has flowed in from the pump 6 via the pump downstream hose 16, and separates the air as a liquid to be separated 91. The liquid to be separated is caused to flow into the first separation tank 2 via the inlet 24 . Here, the air separation unit 4 may be configured to cause the liquid to be separated 91 to flow into the first separation tank 2 together with the separated air, or may be configured to discharge the separated air into the atmosphere. In FIG. 7, the common ring water port 34 is equipped with a common ring water port nozzle 341 for attaching a hose to flow separated water to be recycled to a target position, and the oil drain port 35 is equipped with a common ring water port nozzle 341 for attaching a hose to flow separated water to be recycled to a target position. An oil drain pipe 351 is attached to drain oil.

Further, in the oil-water separator 1 of this usage example, the pump 6 is arranged in the space directly below the second separation tank 3. This is because the second separation tank 3 has a bottom at a higher position than the bottom of the first separation tank 2, so a larger space can be secured, and relatively large parts such as the pump 6 can be placed in this space. be able to. With this arrangement, the entire device can be made more compact.

The first separation tank 2 and the second separation tank 3 may each have a first separation tank lid part 26 and a second separation tank lid part 36 as lids made of a transparent material. These lids can prevent overflow to the outside of the separation tank even when many bubbles are generated in the liquid to be separated 91 or the first separation tank upper layer liquid 93. Furthermore, since the oil/water separator 1 is a device that performs appropriate separation in a liquid state, it is preferable that there be no bubbles that would interfere with the separation process. By using a lid, the degree of accumulation of bubbles is increased without overflowing to the outside of the separation tank, and bubbles that are close to each other are more likely to disappear.As a result, the number of bubbles can be reduced and separation accuracy can be improved.

The first separation tank 2, the second separation tank 3, and the flow of liquid flowing into them are as described above using FIGS. 1 to 4, and therefore, repeated description will be omitted. Here, the oil-water separator 1 only needs to have the configuration of the first separation tank 2 and the second separation tank 3, and the other configurations may be replaced with any other configuration or may be omitted. You can.

FIG. 8 is a perspective view showing an example of the use of the oil-water separator 1 according to the embodiment of FIGS. 6 and 7. FIG. As shown in this figure, a suction hose 12 connected to a strainer inlet 71 is placed in the used coolant liquid 17 stored in the storage tank 14 . At the tip of the suction hose 12, a floating mixed liquid recovery section 13 is attached to which the supernatant liquid of the used coolant liquid 17 flows, and the suction hose 12 sucks the supernatant liquid portion of the used coolant liquid 17. Further, a ring water hose 11 is attached to the common ring water port nozzle 341 so that the separated water flowing out from the common ring water port 34 is returned into the storage tank 14. Further, the separated oil 95 flowing out from the oil drain port 35 is stored in the waste oil container 18 (via the drain oil drain pipe 351). The example shown in FIG. 8 is an example, and the configuration is not limited to this. For example, the separated water flowing out from the common ring water port 34 may be stored in another storage tank 14, or the separated oil 95 may be recycled.

Although the present embodiment has been described using an oil-water mixed liquid such as a used coolant liquid, the oil-water separator can be used to separate liquids having different specific gravities that are mixed with each other. Moreover, although the case where the separated water is mainly recycled has been described, it is also possible to recycle the separated oil.

1 Oil-water separator 2 First separation tank 21 First communication partition plate 211 First communication port 22 First water level adjustment part 221 First separation tank water level adjustment pipe 222 First separated water container 23 First separated water ring water port 24 Cover Separated liquid inlet 25 First separation tank upper layer liquid outlet 26 First separation tank lid 27 Magnet 3 Second separation tank 31 Channel partition plate 32 Second communication partition plate 321 Second communication port 33 Second water level adjustment part 331 Second separation tank water level adjustment pipe 332 Second separated water container 34 Common ring water port 341 Common ring water port nozzle 35 Oil drain port 351 Drain oil drain pipe 36 Second separation tank lid 4 Air separation unit 5 Pump storage unit 6 Pump 7 Strainer 71 Strainer inlet 11 Recirculated water hose 12 Suction hose 13 Floating mixed liquid recovery section 14 Storage tank 15 Pump upstream hose 16 Pump downstream hose 17 Spent coolant liquid 18 Waste oil container 8 Integrated side wall surface 91 Liquid to be separated 92 First separation tank lower layer liquid 93 First separation tank upper layer liquid 94 Second separation tank lower layer liquid 95 Second separation tank upper layer liquid (separated oil)
96 First separated water 97 Second separated water

Claims (10)

a first separation tank into which the liquid to be separated flows;
The first separation tank upper layer liquid, which is the liquid to be separated, which overflows at the bottom surface of the first separation tank at a position higher than the bottom surface and the side wall surface of the first separation tank flows into the first separation tank upper layer. a second separation tank having a flow path partition plate that forms a flow path through which the liquid is turned back ;
The bottom area of the second separation tank is at least twice the bottom area of the first separation tank, and the water depth of the first separation tank is at least twice the water depth of the second separation tank. Device. The first separation tank is
A part of the first separation tank near the bottom is partitioned off from the upstream side of the first separation tank, which is the side where the liquid to be separated flows in and the upper layer liquid of the first separation tank overflows. a first communication partition plate forming a downstream side;
a first water level adjustment part that causes the lower layer liquid of the first separation tank flowing downstream of the first communication partition plate to overflow and adjusts the water level;
The second separation tank is
a second communication partition plate that partitions off a part of the second separation tank near the bottom at a downstream end of the flow path of the second separation tank;
The oil-water separator according to claim 1, further comprising a second water level adjustment section that adjusts the water level while overflowing the second separation tank lower layer liquid flowing downstream of the second communication partition plate. a first separated water ring water port that causes the first separated water that overflowed in the first water level adjustment section to join with the second separated water that overflowed in the second water level adjustment section;
a common ring water port that circulates the second separated water and the combined first separated water;
The oil-water separator according to claim 2, further comprising: The oil-water separator according to claim 3, wherein the second separation tank further includes an oil drain port provided on the same side wall surface as the common ring water port, with the second communication partition plate interposed therebetween. The overflow of the upper layer liquid of the first separation tank is performed through an integral side wall surface that is a mutually adjacent side wall surface or a common side wall surface of the first separation tank and the second separation tank,
The first communication partition plate and the flow path partition plate each extend from the integral side wall surface,
The first separated water flows into the second separation tank via the integrated side wall surface on the opposite side of the first communication partition plate from the position where the upper layer liquid of the first separation tank overflows. The oil-water separator according to claim 3, wherein the oil-water separator merges with the second separated water. The first water level adjustment section includes:
a first separation tank water level adjustment pipe that extends from near the bottom of the first separation tank and has an upper end at the height of the overflow on the downstream side of the first communication partition plate;
A side wall surface surrounding the upper end of the first separation tank water level adjustment pipe, and a bottom surface through which the first separation tank water level adjustment pipe passes, so that the first separation water can receive overflowing first separated water. a container and
The oil-water separator according to claim 2, comprising: The second water level adjustment section is
a second separation tank water level adjustment pipe that extends from near the bottom of the second separation tank and has an upper end at the height of the overflow on the downstream side of the second communication partition plate;
By having a side wall surface surrounding the upper end of the second separation tank water level adjustment pipe and a bottom surface through which the second separation tank water level adjustment pipe penetrates, the second separation tank receives overflowing second separated water. a container and
The oil-water separator according to claim 2, comprising: The oil-water separator according to claim 2, further comprising a cylindrical magnet placed upstream of the first communication partition plate of the first separation tank. The liquid to be separated flows into the first separation tank,
The upper layer liquid of the first separation tank, which is the liquid to be separated, which overflowed on the side wall surface of the first separation tank flows into a second separation tank having a bottom surface higher than the bottom surface of the first separation tank,
In the second separation tank, the upper layer liquid of the first separation tank flows back through a flow path formed by a flow path partition plate ,
The bottom area of the second separation tank is at least twice the bottom area of the first separation tank, and the water depth of the first separation tank is at least twice the water depth of the second separation tank. Separation method. The lower layer liquid of the first separation tank that has moved to the downstream side of a first communication partition plate partitioned by leaving a part near the bottom of the first separation tank overflows as first separated water,
At the downstream end of the flow path of the second separation tank, the second separation tank lower layer liquid that has moved to the downstream side of a second communication partition plate partitioned by leaving a part near the bottom of the second separation tank, Overflows as second separated water,
The oil-water separation method according to claim 9, wherein the overflowing first separated water and second separated water are recycled at a common water recycling port.

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