JPH08294602A - Oil-water separating device and oil purifying apparatus using the same - Google Patents

Abstract

PURPOSE: To efficiently separate and remove water and impurities from waste oil by a inexpensive and simple constitution. CONSTITUTION: An apparatus is equipped with an inflow chamber 32 communicating with a waste oil inlet 31, an oil-water separation chamber 33, and an outflow chamber 34 which communicates with the upper side of the chamber 33 and also communicates with recovered oil outlet 35. Waste oil is supplied from the inlet 31 into the separation chamber 33 through the inflow chamber 32. In the separation chamber 33, water and impurities precipitate and oil floats. The floating oil is discharged from the outflow chamber 34 to the outlet 35 as recovered oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for recycling waste oil of machine tools and various other machines, draining cleaning oil of various cleaning machines, draining hydraulic oil of heavy machinery for construction, etc. The present invention relates to an oil / water separator and an oil purifier using the same.

[0002]

2. Description of the Related Art An example of a conventional oil purifier will be described with reference to the circuit diagram of FIG. This oil purifier has a waste oil tank 101
The waste oil sucked from the pump 105 by the pump 105 is first filtered through the filter 107, and then the oil / water separation device 103
The water is separated through the oil and the oil is recovered in the recovery tank 109. As the filter 107, a depth type roll tissue type formed by winding a filter paper in a roll shape is used.

Further, the oil-water separator 103 is mainly composed of an ultrafine fiber structure, and waste oil is passed through the ultrafine fiber structure to coarsen the water in the waste oil.
A filter that separates oil and water based on the difference in specific gravity is used. In this specification, the oil / water separation device 10 is used to distinguish the filter for the purpose of separating oil / water from the filter 107 for the purpose of removing contaminants such as dust and sludge.
I will treat it as 3. Further, in this specification, a system in which a pump or the like is connected to the oil / water separator is treated as an oil purifier.

[0004]

In the above-mentioned conventional example, the filter 107 using the filter paper has the advantage that it is inexpensive and highly accurate for capturing the contaminants in the waste oil, but the filter paper is soluble in water. Since it is easy, there is a problem that there is a limit to the water capture. Further, according to the oil-water separator 103 using the ultrafine fiber structure, the material itself is expensive because mass production of the material is difficult, and the resistance to the flow of waste oil is large. There is a problem that a large one is required and the container is expensive.

In addition to the above-mentioned conventional example, conventionally, there is no inexpensive and simple device for separating and removing water, dust, sludge and the like mixed in waste oil.
Many waste oils such as lubricating oils and cleaning oils are currently discarded or incinerated even though there are many demands for recycling.

Further, conventionally, it is necessary to arrange the filter 107 and the oil / water separator 103 in this order on the downstream side of the pump 105. The reason is that the fibers of the oil / water separation device 103 are fine and dust is likely to be clogged, so that it is necessary to arrange the filter 107 on the upstream side. In addition, oil-water separator 1
No. 03 has a large resistance to the flow of waste oil. Therefore, when placed on the upstream side (also referred to as the negative pressure side) of the pump 105, the degree of vacuum increases and cavitation occurs in the waste oil, and air is mixed into the recovered oil. Since it occurs, it is inevitable to arrange it on the downstream side (also referred to as the positive pressure side) of the pump 105.

Therefore, according to the above arrangement, the filter 10
Since the element of No. 7 is likely to be clogged and the filter paper is easily dissolved by the water in the waste oil, it is inevitably replaced at an early stage. Further, the waste oil is agitated by the pump 105, and after the oil content and the water are mixed, the oil / water separation device 103 separates the oil / water, so that the oil purification efficiency is lowered.

The technical problem to be solved by the present invention is
It is an object of the present invention to provide an oil / water separator capable of efficiently separating and removing water and impurities from waste oil with an inexpensive and simple structure, and an oil purifier using the same.

[0009]

According to the invention of claim 1, which solves the above problems, an inflow chamber communicating with an inflow port for waste oil, an oil water separation chamber communicating with a lower side of the inflow chamber, and an oil water separation chamber thereof are provided. And an outflow chamber communicating with the upper side of the and also with the outlet of the recovered oil. The invention of claim 2 is the oil-water separator according to claim 1, characterized in that a mesh member made of a wire mesh or a perforated plate is provided between the oil-water separation chamber and the outflow port. The invention according to claim 3 is the oil-water separation device according to claim 1, characterized in that a flow straightening plate is provided for imparting a vortex to the waste oil flowing through the oil-water separation chamber. The invention of claim 4 is the oil-water separator according to claim 1, wherein the oil-water separation chamber is formed by a container body made of a transparent or translucent material. The invention of claim 5 is an oil purifier characterized in that the oil-water separation device of claim 1 is arranged on the upstream side of a pump.

[0010]

According to the oil-water separation device of the first aspect, the waste oil flows from the inflow port through the inflow chamber into the oil-water separation chamber (simply referred to as a separation chamber). In the separation chamber, water and contaminants settle down due to the difference in specific gravity, and the oil content floats up. This floating oil component is discharged as recovered oil from the outlet through the outflow chamber.

According to the second aspect of the present invention, the reticulated member prevents the flow of water once separated and settled in the separation chamber due to the difference in the surface tension of the oil content and the surface tension of the water, and retains only the recovered oil. Pour through the mesh to the outlet. According to the oil-water separation device of the third aspect, a swirling flow is imparted to the waste oil flowing through the separation chamber by the straightening vane, so that the transfer energy of water is reduced and the water is easily settled. Further, due to the difference between the surface tension of the oil component and the surface tension of the moisture component, the oil component is likely to rise along the straightening vane and the moisture component is likely to fall. According to the oil-water separator of claim 4,
The inside of the separation chamber can be visually recognized from the outside through the container body.

According to the oil purifier of the fifth aspect, since the oil-water separator is arranged on the upstream side of the pump, the waste oil before passing through the pump, that is, the waste oil not stirred by the pump, flows into the oil-water separator. be able to. Therefore, the waste oil in a state where the oil content and the water content are not stirred can be separated into oil and water by the oil / water separator. The oil-water separator according to claim 1 used in this oil purifier has a smaller resistance to the flow of waste oil than a conventional apparatus using a microfiber structure. Therefore, the waste oil separator can be disposed upstream of the pump. Cavitation is less likely to occur inside, and the inclusion of air in the recovered oil is reduced or prevented.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIG. 1, which is a sectional view of an oil / water separator, an oil / water separator 3 includes a substantially cup-shaped container body 11 as a main body, and a cover body 12 for covering an upper surface of the container body 11.
Consists of The container body 11 and the cover body 12 are integrated by screwing the union nut 13 engaged with the flange portion 11a of the container body 11 onto the external thread 12a of the cover body 12. A seal ring 14 is incorporated in the joint surface of the cover body 12 to the container body 11 in order to keep the joint surface airtight.

The cover body 12 forms a recessed space which is continuous with the internal space of the container body 11, and a waste oil inflow port 31 and a waste oil outflow port 35 are formed at opposite positions on the side wall thereof. The inflow port 31 and the outflow port 35 are formed in screw holes, and a pipe for piping (not shown) can be connected by screw connection.

The recess space of the cover body 12 is a partition wall 16
It is divided into two rooms. One of the chambers is an inflow chamber 32 that communicates with the inflow port 31, and the other chamber is an outflow chamber 34 that communicates with the outflow port 35. Further, the internal space of the container body 11 is a separation chamber 33 that communicates with the lower side of the inflow chamber 32 and the outflow chamber 34 with the upper side.

The partition wall 16 is provided at a laterally asymmetrical position, that is, at a position on the left side in the drawing, and the passage sectional area A of the inflow chamber 32 and the passage sectional area B of the outflow chamber 34 are set to A <B. The cross-sectional areas A and B in the case of this example correspond to the cross-sectional area of the inflow chamber 32 and the outflow chamber 34.

A mesh member 17 made of a wire mesh or a perforated plate is attached to the tip edge (lower end surface in the drawing) of the partition wall 16 with a fixing screw 18. The mesh member 17 is
It is provided so as to partition the separation chamber 33 and the outflow chamber 34. The openings of the mesh member 17 (corresponding to the openings of the wire mesh and the hole diameter of the perforated plate) are, for example, about 3 to 4 mm.

A pillar 19 is attached to the lower surface of the mesh member 17 in a hanging shape, and a flat plate-shaped straightening plate 20 is attached to the tip of the pillar 19. The current plate 20 is
A vortex is added to the flow of waste oil, and the separation chamber 33 is arranged in an inclined shape such that the central side of the separation chamber 33 is raised and the lateral side thereof is lowered. As the current plate 20, for example, a metal plate, an iron plate, a copper plate, a Teflon plate, or the like can be used.

The container body 11 is formed of a transparent or translucent material, for example, a synthetic resin material such as polycarbonate resin or acrylic resin. The cover body 1
2 is made of metal or synthetic resin. Also, the container body 11
A screw member 21 having a drain hole 21a is attached to the bottom of the. A plug 22 for closing the drain hole 21a is screwed onto the screw member 21.

Next, an example of an oil purifier using the oil / water separator 3 will be described with reference to FIG. 2 which is a circuit diagram thereof. The waste oil supply side pipe 2 connected to the waste oil tank 1 is connected to the inflow port 31 of the oil water separator 3, and the pipe 4 connected to the suction port of the pump 5 is connected to the outflow port 35. The pipe 6 connected to the discharge port of the pump 5 is a filter 7
A pipe 8 connected to the recovery tank 9 is connected to the liquid outlet of the filter 7. The filter 7 is a depth type roll tissue type filter formed by winding a filter paper in a roll shape.
As the pump 5, a trochoid pump, a gear pump, a positive displacement pump such as a vane pump, or a cascade pump is used.

In the above oil purifier, when the pump 5 is operated, the suction side flow path (oil-water separation device 3) leading to the waste oil tank 1
The waste oil in the waste oil tank 1 is sucked into the oil / water separation device 3 via each chamber therein and a pipe line communicating therewith. In FIG. 1 in which the oil-water separator 3 is shown, the waste oil is
From the inflow port 31 of the oil / water separation device 3 to the oil / water separation chamber 33 through the inflow chamber 32. In the oil / water separation chamber 33, water and impurities settle down due to the difference in specific gravity, and the oil content floats up. The floating oil component is discharged as recovered oil from the outflow port 35 through the outflow chamber 34.

The recovered oil discharged from the outlet 35 of the oil / water separator 3 is sucked into the pump 5, and then the filter 7
Through to the recovery tank 9. The filter 7 removes fine impurities remaining in the recovered oil without being separated by the oil / water separator 3, and a clean oil is sent to the recovery tank 9.

According to the oil / water separator 3 of the oil purifier described above, a simple structure including the inflow chamber 32, the oil / water separation chamber 33, and the outflow chamber 34 through which the waste oil flows efficiently separates water and impurities from the waste oil. Can be removed. Further, it can be said that the resistance to the flow of waste oil is extremely small as compared with the device using the conventional ultrafine fiber structure. Therefore,
Even if the oil / water separation device 3 is arranged on the upstream side of the pump 5, cavitation is unlikely to occur in the waste oil, and air is hardly mixed in the recovered oil.

Further, since the passage sectional area B of the outflow chamber 34 is larger than the passage sectional area A of the inflow chamber 32, the flow velocity of the waste oil becomes slower when passing through the outflow chamber 34 than when passing through the inflow chamber 32. Therefore, it is possible to increase the time required for the water and impurities contained in the recovered oil in the vicinity of the outflow chamber 34 to settle, that is, the separation time.

Further, the mesh member 17 provided between the separation chamber 33 and the outflow chamber 34 prevents the flow of the water once separated and settled by the difference in the surface tension of the oil component and the surface tension of the water component, so that the separation chamber is separated. Since the collected oil is retained at 33 and only the collected oil flows through the mesh to the outflow port 35, it is possible to prevent water from flowing out into the collected oil.

The current plate 20 disposed in the separation chamber 33 gives a vortex to the waste oil flowing in the separation chamber 33. The flow of waste oil by the flow straightening plate 20 is represented by a thick arrow in FIG. By providing a vortex (see arrow V) to the waste oil by the straightening plate 20, the moving energy of water is reduced and the water easily sediments, so that the oil-water separation effect is enhanced. Further, due to the difference between the surface tension of the oil component and the surface tension of the water component, the oil component is likely to rise along the front and back surfaces of the straightening plate 20 and the moisture is likely to fall, and the oil-water separation effect is enhanced.

By visually observing the inside of the separation chamber 33 from the outside through the transparent or translucent container body 11,
It is possible to easily grasp the oil-water separation state of the waste oil in the separation chamber 33. The water accumulated in the separation chamber 33 can be easily discharged manually by opening the plug 22 at the bottom of the container body 11. If a valve or a cock is attached instead of the plug 22, the water and contaminants accumulated in the bottom of the separation chamber 33 can be discharged more easily.

Further, according to the above-mentioned oil purifier, as shown in FIG. 2, since the oil / water separating device 3 is arranged on the upstream side of the pump 5, the oil / water separating device 3 has waste oil before passing through the pump 5, that is, the pump. By means of 5, waste oil which is not stirred can be introduced. Therefore, since the waste oil in which the oil content and the water content are not stirred is separated into oil and water by the oil / water separator 3, effective oil / water separation can be realized as compared with the case where the oil / water separator 3 is arranged on the downstream side of the pump 5. You can Further, the oil-water separation device 3 used in this oil purifier has a smaller resistance to the flow of waste oil than the device using the conventional ultrafine fiber structure, as described above, and therefore, is disposed on the upstream side of the pump 5. Even if they are arranged, cavitation is unlikely to occur in the waste oil, and the mixing of air into the recovered oil can be reduced or prevented, so that effective oil-water separation can be realized.

Further, since the filter 7 using a filter paper connected to the downstream side of the pump 5 can remove fine impurities remaining in the recovered oil without being separated by the oil / water separator 3, it is almost free of impurities. It is possible to obtain a pure, purified oil. Further, at this time, since the recovered oil from which water and contaminants have been separated by the oil-water separator 3 first passes, the filter paper is less likely to be dissolved by moisture and clogging due to contaminants is less, and compared to the conventional use of the filter 7. The replacement period can be extended.

The mesh member 17 can also be arranged in the central portion of the separation chamber 33 of the oil / water separator 3 shown in cross section in FIG. In this case, the container body 11 is provided with the stepped portion 24, and the pressing portion 25 corresponding to the stepped portion 24 is protruded from the cover body 12, and the stepped portion 24 and the holding portion 25 allow the peripheral edge of the mesh member 17 to be formed. Holds the department. Further, the current plate 20 is supported on the mesh member 17 via columns 26. The container body 11 is directly screwed to the cover body 12, and a packing 27 is interposed between the joint surfaces.

By disposing the mesh member 17 in the central portion of the separation chamber 33 as described above, it is possible to effectively suppress the floating of the water separated in the lower portion of the separation chamber 33. Further, since the flow straightening plate 20 also imparts a swirl flow (see arrow V1) to the recovered oil flowing into the outflow chamber 34, the moving energy of water is reduced, and the water easily precipitates, so that the oil-water separation effect is enhanced. .

Further, by connecting the inflow port 31 of the other oil / water separation device 3 to the outflow port 35 of the oil / water separation device 3 so that the oil / water separation device 3 is connected to two or three stations, more moisture can be obtained. It is possible to separate and remove impurities.

[0033]

According to the oil-water separator of claim 1,
With a simple configuration including an inflow chamber, a water separation chamber, and an outflow chamber in which waste oil flows, water and contaminants can be efficiently separated and removed from the waste oil.

According to the oil-water separator of the second aspect, the net member prevents the water once separated from the waste oil from flowing to the outlet, so that the water can be prevented from flowing out into the recovered oil. According to the oil / water separation device of the third aspect, the oil / water separation effect is enhanced by imparting a vortex to the waste oil by the flow straightening plate, and at the same time, the separation effect utilizing the surface tension difference between the oil content and the water with respect to the flow straightening plate is obtained. According to the oil-water separation device of the fourth aspect, the oil-water separation state of the waste oil in the separation chamber can be easily grasped by visually recognizing the container body through the outside.

According to the oil purifier of the fifth aspect, the oil / water separator is arranged upstream of the pump, and the waste oil not stirred by the pump is separated by the oil / water separator. Effective oil-water separation can be realized as compared with the case of arranging on the downstream side. Further, according to the oil-water separator used in this oil purifier, the resistance to the flow of waste oil is small, so that even if it is arranged upstream of the pump, cavitation is unlikely to occur in the waste oil, and the air into the recovered oil is reduced. It is possible to reduce or prevent the mixture of oil and oil, thereby solving the problems of the conventional oil / water separation device and realizing effective oil / water separation.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an oil / water separator.

FIG. 2 is a circuit diagram showing an oil purifier using an oil / water separator.

FIG. 3 is a cross-sectional view showing another example of the oil-water separator.

FIG. 4 is a circuit diagram showing a conventional oil purifier.

[Explanation of symbols]

 3 Oil / Water Separation Device 5 Pump 7 Filter 11 Container 17 Net Member 20 Rectifier Plate 31 Inlet 32 Inflow Chamber 33 Oil / Water Separation Chamber 34 Outflow Chamber 35 Outlet

Claims (5)

[Claims] 1. An inflow chamber communicating with a waste oil inflow port, an oil water separation chamber communicating with a lower side of the inflow chamber, and an outflow chamber communicating with an upper side of the oil water separation chamber and a recovered oil outflow port. An oil-water separation device comprising: 2. The oil / water separation device according to claim 1, wherein a mesh member made of a metal mesh or a perforated plate is provided between the oil / water separation chamber and the outlet. 3. The oil / water separation device according to claim 1, further comprising a straightening plate for imparting a vortex to the waste oil flowing through the oil / water separation chamber. 4. The oil / water separation device according to claim 1, wherein the oil / water separation chamber is formed by a container body made of a transparent or translucent material. 5. An oil purifier characterized in that the oil-water separator according to claim 1 is arranged upstream of a pump.