JPS636275B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applied to ships in which oil and seawater (also abbreviated as water) are removed from a bilge containing a mixture of oil (abbreviated as oil in this specification). This invention relates to a centrifugal oil/water separation method for automatically, continuously, efficiently, and completely and reliably separating oil and water (.), and to an oil/water separator used to carry out the method.

<Prior art and its problems> As oil/water separators for ships of this type, the separating plate type and the coalescer type have been known for a long time, and the latter type is the most widely used despite its high cost. ing. Due to its structure, a glass fiber filter material called a coalescer is sealed and installed in the separation tank in a stacked state forming an overall hollow cylindrical shape, and the bilge is passed through the gaps between the fibers. Although it is designed to capture only the oil contained in the oil and collect it in a floating state in the upper part of the separation tank, its oil-water separation effect is still inferior.

In other words, the fiber gaps in the coalescer are extremely narrow, leading to early clogging, and combined with internal and external pressure changes that are divided by the shape of the partition wall of the hollow cylinder, accidents that break the coalescer frequently occur. Because it does. If the operation continues without any knowledge of the malfunction, there is a risk of oil spilling onto the sea, so the separation tank must be periodically disassembled for maintenance and inspection. The expensive coalescer will also have to be replaced.

In any case, if the recovered oil still contains water, it cannot be incinerated as is in a waste oil incinerator, so the oil is first transferred to a waste oil settling tank and heated to approximately 100°C. It must be heat-treated, allowed to settle for at least one day and night, then the water must be extracted and only the oil at the top must be incinerated. The subsequent work is extremely complicated and requires a great deal of time and effort, so even if this work were to be carried out all the time during the temporary voyage, the amount of waste oil that accumulates one after another would exceed the processing capacity. On the other hand, as a general centrifugal two-liquid separator not only for ships,
For example, a separation method based on a difference in specific gravity is known, as disclosed in Japanese Patent Publication No. 56-17149. However, in this case, where a detection device that responds to comparative changes in the liquid is installed,
The separation line between the two liquids changes depending on the predetermined specific gravity measurement state, temperature, supply concentration, and other conditions, so it must be adjusted correctly manually using a ring dam. As a result, the adjustment work requires a high degree of skill and skill.
It is not always possible to obtain highly accurate separation performance.
Furthermore, since it is necessary to equip the ring dam with an adjustment mechanism, a delay timer, etc., the structure becomes complicated, and maintenance and inspection cannot be easily performed.

<Means for solving the problems> The present invention is intended to fundamentally solve these problems, and as a centrifugal oil/water separation method,
Bilge in a mixed state of oil and water is supplied into a cylindrical oil-water separation tank 10 sealed by an upper lid 11 and a lower lid 12, and the rotational centrifugal force is applied by driving the separation tank 10 to rotate. The separated oil is transferred from the rotation center of the separation tank 10 to the drain oil pipe 24.
In the centrifugal force type oil/water separation method in which water that has been similarly separated is discharged separately from the periphery of the separation tank 10 to the outside through the drainage pipe 34, A plurality of electrode rods 4 are inserted into the upper lid 11 so that the radial dimensions (R1) (R2) (R3) (R4) from the center of rotation thereof change in length and shortness phase.
3a, 43b, 43c, and 43d to measure the insulation resistance of water and oil in the separation tank 10,
The position of the boundary surface L-L between water and oil is automatically detected, and an electric signal based on the detection result is transmitted to the solenoid valve 26 for opening and closing the oil drain pipe 24 and the solenoid valve for opening and closing the drain pipe 34. By energizing the control unit 44 that automatically controls the drain pipe 36, when the ratio of clean water in the above-mentioned mixed state is larger than the oil, only the solenoid valve 36 of the drain pipe 34 is opened, and conversely, when the ratio of water in the mixed state is larger than that of oil, only the solenoid valve 36 of the drain pipe 34 is opened. When the amount is excessive, only the solenoid valve 26 of the oil drain pipe 24 is opened, so that the boundary surface L-L is always kept within a predetermined range regardless of changes in the mixing ratio. The solenoid valves 26 and 36 are automatically controlled to open and close in order to maintain the temperature of the oil and water. , and an upper hollow rotating shaft 17 that integrally stands up from the center of the upper lid 11, and a lower hollow rotating shaft 2 that also hangs integrally from the center of the lower lid 12.
7, the oil-water separation tank 11 is rotatably supported, and the hollow interior of the upper hollow rotating shaft 17 that communicates with the upper lid 11 of the separation tank 10 is used as an oil outflow path 23 after the separation process. The inflow path 28 of the bilge in which oil and water are in a mixed state is connected to the drain oil pipe 24 which is connected to the outflow path 23 and the hollow interior of the lower hollow rotary shaft 27 which also opens and communicates with the lower lid 12 of the separation tank 10. As such, the bilge inflow pipe 2 connected to the bilge inflow pipe 28 is connected to the bilge inflow pipe 2.
9 and the water outflow passage 3 after the hollow interior of the hollow sheath shaft 31 attached and integrated with the lower hollow rotating shaft 27 is separated.
3, the upper part of the water outflow channel 33 and the separation tank 10
a water collection pipe 42 that communicates with a water outflow hole 41 opened at the peripheral edge of the lower lid 12; a drainage pipe 34 that communicates with the lower part of the water outflow path 33; and the upper lid 11 of the separation tank 10. To measure the insulation resistance of oil and water in the separation tank 10, which is inserted and installed so that the radial dimensions (R1) (R2) (R3) (R4) from the center of rotation change in length and shortness phase. A plurality of electrode rods 43a, 43b, 43 automatically detect the position of the oil-water interface L-L.
c, 43d, and a control unit 44 that automatically controls the opening/closing solenoid valves 26, 37, and 36 installed in the middle of the oil drain pipe 24, the bilge inflow pipe 28, and the drain pipe 34, respectively. The unit 44 is electrically connected to the plurality of electrode rods 43a, 43b, 43c, 43d, and the electrode rods 43a, 43b, 43c,
By energizing the control unit 44 with a signal based on the detection result of 43d, the solenoid valve 2
6, 37, and 36 are set to automatically control opening and closing.

<Example> Hereinafter, the specific configuration of the present invention will be described in detail based on the illustrated example. In FIGS. 1 to 9 showing the centrifugal oil/water separator, 10 is a hollow cylindrical rotating separation tank. It is assembled in a sealed state by an upper lid 11 and a lower lid 12 which are detachably attached to the body surface. Reference numeral 13 denotes a hollow support tube that is fixed and vertically fixed at the center of the separation tank 10, from which a plurality of blade plates 14 (total of 4 in the figure) are projected radially. The inside is the fourth,
As is clear from Figure 5, multiple (total of 4 in the figure)
It is divided into small rooms S.

The partition form by the blade plate 14 is the separation tank 1
This is based on the purpose of efficiently applying rotational centrifugal force to the bilge flowing into the chamber S, but from the perspective of equalizing the flow of the bilge and the internal pressure of each small chamber S,
A large number of communication holes 15 and 16 are opened in each of the blade plates 14 and the strut tubes 13, as shown in FIGS. 3 to 5.

Reference numeral 17 denotes an upper hollow rotating shaft that stands integrally upward from the center of the upper lid 11 of the separation tank 10, and functions to rotate the separation tank 10 by a motor 18 installed at its upper end. do. A suitable rotational speed is about 1800 rpm. This is because by capping the bilge, only water is separated from the oil, and impurities such as sludge, which is heavier than water, contained in the bilge can be discharged and collected together with the oil. There is no need to rotate it at a high speed of over 10,000 revolutions. 19 is a flange type shaft joint for directly connecting the rotating shaft 17 and the output shaft of the motor 18; 20 is also the rotating shaft 1;
7 bearing, 21 installation frame, 22 separation tank 1
0 safety guard is shown.

Further, as is clear from FIG. 3, the inside of the upper hollow rotating shaft 17 is perforated as an oil outflow path 23 after separation treatment, and the lower end thereof is opened to communicate with the rotational center of the separation tank 10. Similarly, a cap ring 25 of an oil drain pipe 24 is connected to the upper end opening. A solenoid valve 26 for opening and closing is also inserted in the middle of the drain oil pipe 24.

On the other hand, 27 is a lower hollow rotating shaft that stably supports the separation tank 10 from below, and the hollow interior thereof is formed as a bilge inflow passage 28 through it, and the opening of the bilge inflow pipe 29 is formed at the lower end opening thereof. The metal ring 30 is also connected in communication. 31 is a hollow sheath shaft that is integrally attached to the rotating shaft 27 so as to form a double shaft as a whole, and the installation frame 2
1 by a bearing 32, and a lower end opening of a water outflow passage 33 defined in the hollow interior thereof is connected in communication with a cap ring 35 of a drain pipe 34. Also in the middle of the drain pipe 34 and the bilge inflow pipe 29, there are solenoid valves 3 for opening and closing.
6,37 are installed.

Reference numeral 38 denotes a saucer plate fixedly attached to the lower lid 12 of the separation tank 10 from below so as to form a bilge distribution channel 39 with a constant gap in conjunction with the lower lid 12 of the separation tank 10;
It is integrally connected to the hollow sheath shaft 31 at its center. Reference numeral 40 denotes a large number of bilge distribution holes arranged throughout the lower cover 12 so as to communicate with each of the small chambers S, and all of them are connected to the bilge distribution passage 39.
Needless to say, it is in communication with the bilge inlet passage 28 of the lower hollow rotating shaft 27 via the lower hollow rotating shaft 27.

Also, 41 is in communication with each small room S.
A plurality of water outflow holes are arranged at the peripheral edge of the lower lid 12, and these holes are connected to the upper end opening of the water outflow path 33 formed by the hollow sheath shaft 31 through an elbow-shaped water collection pipe 42. ing.

In other words, the bilge is a mixture of oil and water.
From the bilge inflow pipe 29 to the lower hollow rotating shaft 27
The oil is completely supplied from below to the inside of the separation tank 10 through the bilge inflow path 28 and the bilge distribution path 39, and the oil is subjected to rotational centrifugal force of the separation tank 10, and the oil flows into the separation tank 10. The water is collected at the rotational center of the separation tank 10 and at the rotational periphery of the separation tank 10, so that an oil-water interface L-L is formed in a substantially cylindrical shape.

Then, the oil that has been separated by the centrifugal force of the rotation is discharged upward from the center of rotation to the oil drain pipe 24 through the oil outflow path 23 of the upper hollow rotating shaft 17, and the water is also separated. Directing downward from the periphery of the tank 11, a water collection pipe 42 and a hollow sheath shaft 3 are connected.
The water is discharged to a drain pipe 34 via an outflow channel 33 in the water pipe 1 .

Furthermore, 43a, 43b, 43c, and 43d are a plurality of electrode rods (a total of 4 in the figure) fixedly installed on the upper lid 11 of the separation tank 10 as shown in FIG. This functions to automatically detect the position of the interface L-L between oil and water by measuring the insulation resistance between the oil and water in the separation tank 10.

In that case, the mixing ratio of oil and water in the bilge is not always constant, and therefore the position of the above-mentioned interface L-L also changes from time to time, so it is important to know how this changes. The electrode rods 43a, 43b, 43
c, 43d as a plurality, and the insertion position (detection point) into the separation tank 10 is determined by the radius dimension (R1) (R2) (R3) from the rotation center in the separation tank 10.
The phase is changed so that (R4) is different in length and short.

And the electrode rods 43a, 43b, 43c,
43d is transmitted to a control unit (electrical control panel) 44, and the control unit 44 controls the boundary surface L-L.
The electromagnetic valves 26, 36, and 37 are automatically opened and closed in order to maintain and control the voltage within a predetermined range. Electrode rods 43a, 43
b, 43c, and 43d function as switches for controlling opening and closing.

Therefore, as is clear from FIGS. 8 and 9, a plurality of electrode rods 43a,
A number of slip rings 45 corresponding to the numbers 43b, 43c, and 43d are fitted so as to be able to rotate integrally with the rotating shaft 17, and a carbon brush 46 that comes into contact with each slip ring 45 is also attached. electrode rods 43a, 43b, 4
3c and 43d are connected to the control unit 44 via a conductive wire 47, a slip ring 45, a carbon brush 46, and another conductive wire 48. still,
The control unit 44 and the solenoid valve 2
It goes without saying that 6, 36, and 37 are electrically connected to each other.

49 is a Bakelide plate interposed between adjacent slip rings 45, 50 is a rubber ring also inserted into the fitting surface of the slip ring 45 and rotating shaft 17, and 51 is a rubber ring for fixing the slip ring 45. A nut 52 screwed onto the rotating shaft 17
is a holding plate for the carbon brush 46, and a back pressure for contacting the carbon brush 46 with the slip ring 45 is applied to the carbon brush 46 by a coil spring 53 enclosed therein.

<Function> Next, the oil-water separation function of the present invention will be explained based on FIGS. 3 and 10. The bilge from which foreign matter has been removed by the strainer is moved to the bilge inflow pipe by a bilge pump (not shown) as shown by the arrow. 29, through the bilge inflow passage 28 and bilge distribution passage 39 of the lower hollow rotating shaft 27, and flows into the separation tank 10 from below, but since the separation tank 10 is rotationally driven by the motor 18, its rotation is Under the action of centrifugal force, the water mixed in the bilge is collected at the periphery of the separation tank 10, and the oil is collected at the rotation center of the separation tank 10. is produced in a substantially cylindrical shape.

In that case, since the oil/water mixing ratio of the bilge supplied into the separation tank 10 is not always constant, the position where the boundary surface L-L is formed also changes. ~4 electrode rods 43a, 4
3b, 43c, and 43d, as described above, the detection positions are distributed in such a manner that the phase changes as a whole in terms of the radial dimensions (R1) (R2) (R3) (R4) from the center of rotation in the separation tank 10. , it is possible to always reliably detect the generation position of the boundary surface L-L, and now the boundary surface L-L between oil and water can be detected as shown in Fig. 10.
If it is assumed that the best separation effect can be obtained when the second electrode rod 43b and the third electrode rod 43c are located within the mutual spacing range, then the drain pipe 34
By maintaining and controlling the solenoid valve 36 for opening/closing the solenoid valve 36 for opening/closing the drain oil pipe 24 and the solenoid valve 26 for opening/closing the drain oil pipe 24 by the control unit 44, the oil after the separation process is released from the center of rotation of the separation tank 10. The oil is discharged and recovered upwardly through the oil outflow path 23 of the upper hollow rotating shaft 17 and the oil drain pipe 24.

On the other hand, the water after the separation treatment also heads downward from the periphery of the separation tank 10, passes through the water collection pipe 42, the water outflow passage 33 of the hollow sheath shaft 31, and the drainage pipe 34,
This type of oil-water separation is automatically and continuously performed efficiently, and as a result, the separated oil contains no water, so it can be quickly and completely removed by a waste oil incinerator. It can be incinerated.

As mentioned above, the mixing ratio of oil and water in the bilge supplied to the separation tank 10 is not constant. The generation positions of L-L are, for example, the third electrode rod 43c and the fourth electrode rod 4 in FIG.
3d, the separation tank 10 will be displaced toward the periphery (outside), but at that time, the insulation resistance value of oil and water will increase, so the value should be changed to this value. By measuring with the third electrode rod 43c and the fourth electrode rod 43d located correspondingly, the position of the displaced boundary surface L-L is detected, and the opening/closing solenoid valve 26 of the oil drain pipe 24 is opened, and an appropriate The control unit 44 controls the solenoid valve 36 for opening and closing the drain pipe 34 to keep it closed.

Conversely, if we assume that water is contained in excess of oil, the interface L-L will be, for example, the first electrode rod 4.
3a and the second electrode rod 43b, the separation tank 10 is displaced toward the center of rotation (inside), but at that time, the insulation resistance value also decreases, so this The first corresponding position
By measuring with the electrode rod 43a and the second electrode rod 43b, the position of the displaced boundary surface L-L is also detected, and this time, the solenoid valve 36 of the drain pipe 34 is opened, and an appropriate amount is removed. Along with draining water,
The solenoid valve 26 of the oil drain pipe 24 is kept closed, and in this way the water-oil interface L-L is kept closed.
can always and automatically be maintained within a certain range within which the best separation effect described above is achieved. Incidentally, the predetermined range is 1 to 10 MΩ of the above insulation resistance value, which means that the oil after separation treatment can be completely incinerated without actually using an auxiliary combustion burner.
(mega ohms) is preferable.

Furthermore, when the boundary surface L-L shifts to the position of the first electrode rod 43a or the fourth electrode rod 43d, so to speak, in an excessively biased state, the solenoid valve 37 for opening and closing the bilge inflow pipe 29 is closed, The bilge pump can also be controlled to stop its operation and stop supplying bilge, and such an emergency can be alerted by a buzzer, flashing lamp, etc. In addition, when the separator itself is not in use,
Of course, all of the electromagnetic valves 26, 36, and 37 must be kept closed.

<Effects of the Invention> In summary, in the present invention, the upper lid 11 and the lower lid 1
By supplying bilge in a mixed state of oil and water into a cylindrical oil-water separation tank 10 sealed by 2, and then rotating the separation tank 10,
Separation tank 10 separates the oil separated by the rotational centrifugal force.
A centrifugal force type system in which water that has been separated is discharged from the rotation center of the tank 10 to the outside through the drainage pipe 24, and water that has also been separated is separately discharged from the periphery of the separation tank 10 to the outside through the drainage pipe 34. In the oil-water separation method, a plurality of electrode rods 4 are inserted into the upper lid 11 of the separation tank 10 so that the radial dimensions (R1) (R2) (R3) (R4) from the center of rotation thereof change in length and shortness phase.
3a, 43b, 43c, and 43d measure the water and insulation resistance in the separation tank 10, automatically detect the position of the interface L-L between the water and oil, and generate electricity based on the detection results. A signal is energized to the control unit 44 that automatically controls the opening/closing solenoid valve 26 of the oil drain pipe 24 and the opening/closing solenoid valve 36 of the drain pipe 34, and it is determined that the ratio of the mixed state is that the water is in excess of the oil. At certain times, only the solenoid valve 36 of the drain pipe 34 is opened, and when there is more oil than water, only the solenoid valve 26 of the oil drain pipe 24 is opened. Regardless of changes in This has the effect of completely eliminating the problems of the prior art described above.

That is, the mixing ratio of oil and water in the bilge supplied into the separation tank 10 is not always constant, and therefore the interface L-L between the oil and water also changes from time to time. Furthermore, the electrical resistance of oil and the electrical resistance of water are originally different in value, and when the above-mentioned boundary surface L-L changes, the insulation resistance value of the oil and water will also change, such as increasing or decreasing. , by measuring the insulation resistance with the electrode rods 43a, 43b, 43c, and 43d, automatically detecting the generation position of the boundary surface LL, and transmitting the electric signal of the detection result to the control unit 44, Drain oil pipe 24
The solenoid valve 26 of the drain pipe 34 and the solenoid valve 36 of the drain pipe 34 are controlled to open and close, and the interface L-L between them is always maintained within a predetermined range.
The above bilge with inconsistent oil/water mixing ratio is the separation tank 1.
Even if the separation tank 10 is supplied to the upper lid 1
1 and the lower lid 12, the best oil-water separation effect can be automatically obtained at all times even if it is a closed type that cannot be seen visually, and only the oil can be efficiently and completely incinerated.

Moreover, the electrode rods 43a, 43b, 43c,
43d is a plurality of radial dimensions (R1) (R2) from the center of rotation due to the relationship with the cylindrical separation tank 10.
(R3) and (R4) are inserted and installed in a distribution state where the long and short phases change, and as a result, the position of the boundary surface L-L is always reliably and automatically detected. Unlike the separation method based on the difference in specific gravity, there is no need for artificial gravity adjustment using a ring dam, and the specific gravity is determined by the measurement accuracy, supply concentration, and other external conditions. Excellent separation effects can always be achieved completely automatically without any adjustments.

Next, regarding the structure of the oil-water separator, in the case of the present invention, the electrode rod 43 is inserted into the separation tank 10.
By inserting and installing a, 43b, 43c, and 43d, the position of the oil-water interface L-L can be automatically detected, eliminating the need for a structure to enable adjustment using the ring dam. Moreover, the separation tank 10 itself can be formed into a safe closed type with an upper lid 11 and a lower lid 12.

In addition, the separation tank 10 has a pair of upper and lower hollow rotating shafts 17 that integrally stand up from the upper lid 11 and lower hollow rotating shafts 27 that integrally hang down from the lower lid 12, so that the separation tank 10 can be operated in its non-penetrating state. Since it is rotatably supported, the capacity of the bilge can be increased as much as possible when the size of the separation tank 10 is kept constant. An oil outflow path 23 after treatment is formed, and a water outflow path 33 is also formed in the lower hollow rotating shaft 2.
7, a hollow sheath shaft 31 forms a so-called double shaft.
The bilge inlet passage 28 is also formed by using the hollow interior of the lower hollow rotating shaft 27, so that it is rational as a whole to adapt to the oil-water separation effect due to the rotational centrifugal force. It is possible to create a highly stable piping system and an extremely stable bearing structure, and is extremely effective in terms of maintenance and inspection workability.

Furthermore, the oil after the separation process through the piping system is directed upward from the center of rotation of the separation tank 10, and the water is also directed upward from the center of rotation of the separation tank 10 through the water collection pipe 4.
2, the oil and water are drained downward through the oil and water, so the difference in the specific gravity of the oil and water can be effectively used to obtain an automatic and smooth draining action. At the same time, it can be effectively pulled upwards on its own.

Furthermore, due to the above piping configuration, there are no obstacles such as the water collection pipe 42 located at the bottom on the surface of the upper lid 11 of the separation tank 10, so that the plurality of electrode rods 43a, 43b, 43c, and 43d can be connected to each other. With the above-mentioned phase-changed distribution state, it is possible to rationally arrange and install them on the top cover 11 without any restrictions, and it is extremely beneficial for making the overall structure smaller and more compact and improving durability. I can say it.

[Brief explanation of the drawing]

FIG. 1 is a front view of the overall external appearance of an oil-water separator according to the present invention, FIG. 2 is a side view, FIG. 3, FIG. 7 is a partially enlarged sectional view taken along line - in FIG. 3, FIG. 8 is a sectional view taken along line - in FIG. 1, FIG. 9 is a partially enlarged cross-sectional view taken along the line - in FIG. 8, and FIG. 10 is a schematic cross-sectional view for explaining the oil-water separation effect. 10...Oil/water separation tank, 11...Top lid, 12...
Lower lid, 17... Upper hollow rotating shaft, 18... Motor, 23... Oil outflow path, 24... Oil drain pipe, 2
6, 36, 37...Solenoid valve, 27...Lower hollow rotating shaft, 28...Bilge inflow channel, 29...Bilge inflow pipe, 31...Hollow sheath shaft, 33...Water outflow channel,
34...Drain pipe line, 38...Saucer plate, 39...Bilge distribution line, 41...Water outflow hole, 42...Water collection pipe line, 43a-43d...Electrode rod, 44...Control unit, 45... ...Slip ring, 46
...Carbon brush, 52...Retaining plate, L-L...
...boundary surface, S...small room.

Claims (1)

[Claims] 1. Bilge in a mixed state of oil and water is supplied into a cylindrical oil-water separation tank 10 sealed by an upper lid 11 and a lower lid 12, and then the separation tank 10 is driven to rotate. As a result, the separated oil is caused to flow out from the center of rotation of the separation tank 10 through the oil drain pipe 24, while the water that has also been separated is caused to flow out from the periphery of the separation tank 10. In the centrifugal force type oil/water separation method in which oil and water are separately discharged to the outside through the drainage pipe 34, the radial dimensions (R1) (R2) (R3) (R4) from the rotation center of the upper lid 11 of the separation tank 10 are ) are inserted and installed so that the phase changes in length and shortness 4.
3a, 43b, 43c, and 43d to measure the insulation resistance of water and oil in the separation tank 10,
The position of the boundary surface L-L between water and oil is automatically detected, and an electric signal based on the detection result is transmitted to the solenoid valve 26 for opening and closing the oil drain pipe 24 and the solenoid valve for opening and closing the drain pipe 34. By energizing the control unit 44 that automatically controls the drain pipe 36, when the ratio of clean water in the above-mentioned mixed state is larger than the oil, only the solenoid valve 36 of the drain pipe 34 is opened, and conversely, when the ratio of water in the mixed state is larger than that of oil, only the solenoid valve 36 of the drain pipe 34 is opened. When the amount is excessive, only the solenoid valve 26 of the oil drain pipe 24 is opened, so that the boundary surface L-L is always kept within a predetermined range regardless of changes in the mixing ratio. A centrifugal force type oil/water separation method characterized in that the electromagnetic valves 26 and 36 are automatically controlled to open and close in order to maintain the same. 2. An upper hollow rotating shaft 17 that has a cylindrical shape sealed by the upper lid 11 and the lower lid 12 and stands up integrally from the center of the upper lid 11, and a lower part that also hangs integrally from the center of the lower lid 12. Hollow rotating shaft 2
7, the oil-water separation tank 10 is rotatably supported, and the hollow interior of the upper hollow rotating shaft 17 that communicates with the upper lid 11 of the separation tank 10 is used as an oil outflow path 23 after the separation process. The inflow path 28 of the bilge in which oil and water are in a mixed state is connected to the drain oil pipe 24 which is connected to the outflow path 23 and the hollow interior of the lower hollow rotary shaft 27 which also opens and communicates with the lower lid 12 of the separation tank 10. As such, the bilge inflow pipe 2 connected to the bilge inflow pipe 28 is connected to the bilge inflow pipe 2.
9 and the water outflow passage 3 after the hollow interior of the hollow sheath shaft 31 attached and integrated with the lower hollow rotating shaft 27 is separated.
3, the upper part of the water outflow channel 33 and the separation tank 10
a water collection pipe 42 that communicates with a water outflow hole 41 opened at the peripheral edge of the lower lid 12; a drainage pipe 34 that communicates with the lower part of the water outflow path 33; and the upper lid 11 of the separation tank 10. To measure the insulation resistance of oil and water in the separation tank 10, which is inserted and installed so that the radial dimensions (R1) (R2) (R3) (R4) from the center of rotation change in length and shortness phase. A plurality of electrode rods 43a, 43b, 43 automatically detect the position of the interface L-L between oil and water.
c, 43d, and a control unit 44 that automatically controls the opening/closing solenoid valves 26, 37, and 36 installed in the middle of the oil drain pipe 24, bilge inflow pipe 28, and drain pipe 34, respectively. The unit 44 is electrically connected to the plurality of electrode rods 43a, 43b, 43c, 43d, and the electrode rods 43a, 43b, 43c,
By energizing the control unit 44 with a signal based on the detection result of 43d, the solenoid valve 2
6, 37, and 36 are set to automatically open and close.