JP2005349279A - Oil separation apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently separate oil and used liquid from used oil-containing liquid. <P>SOLUTION: An oil separation apparatus is installed in a storage tank (not illustrated) for storing the used oil-containing liquid, and comprises a suction device 2 and a floatation tank 5 for separating the oil from the used oil-containing liquid. The suction device 2 which sucks floating oil in the used oil-containing liquid to feed the floating oil to the floatation tank 5 at the subsequent stage comprises a suction means which can suck the floating oil, for example, a suction pipe 3 equipped with an air ejector 32, and a float 21 which can make the tip suction opening 31 of the suction pipe 3 approach a floating oil surface 41 from above with the prescribed distance h. While making the suction opening 31 face the floating oil surface 41 from above and keeping the distance h from the floating oil surface constant, the floating oil is selectively sucked by the suction power of the air ejector 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement in an oil-liquid separator for separating oil and used liquid parts from various used oil-containing liquids such as cutting waste liquid.

  Conventionally, used cutting fluid discharged from a cutting machine is mixed with lubricating oil and cutting waste of the processing machine, and these can be separated and recovered and reused. In addition, since the separated oil can be reused, it is preferable in terms of waste reduction and resource saving, and several recovery techniques have been proposed.

  For example, in Patent Document 1 as illustrated in FIG. 3, the floating oil in the tank 11 is sucked from the float suction device 12 by the tube pump 13 and sent to the separation tank 14. In the separation tank 14, the oil component is floated and separated, the floating oil component is recovered through the overflow recovery pipe 14a, and the used cutting fluid is recovered by the overflow return pipe 14b.

  In this case, since the float suction device 12 provided in the floating oil is used for the suction to the floating oil, the used cutting fluid is also sucked and sent to the separation tank 14 in large quantities, so that the size of the device is increased. Or, it tends to cause a decrease in separation efficiency. In addition, although the tube pump 13 has an advantage that there is little external contamination, there is a maintenance precaution such that the transported oil is sticky and needs frequent cleaning. Further, since the oil content is recovered in the separation tank 14 by the overflow recovery pipe 14a, there is a problem that when the oil content becomes scum, the overflow does not function and the oil-liquid separation becomes impossible.

In the case of Patent Document 2 illustrated in FIG. 4, the used oil-containing liquid is temporarily stored in the first separation tank 15, and only the oil component is effectively removed using the skim belt 16 rotating from here. 17 is taken out. Although the skim belt 16 is excellent in oil adsorption, it is effective for selectively extracting oil, but the adsorption capacity is easily saturated and material deterioration is likely to occur. Therefore, the skim belt 16 must be frequently cleaned and replaced. This method also had some cautions in maintenance.
JP-A-8-281255: Claim 1, FIG. JP-A-8-294845: Claim 1, FIG.

  The present invention has been made to solve the above problems, and provides an oil-liquid separation system that efficiently separates an oil component and a used liquid from a used oil-containing liquid such as a waste cutting liquid. Furthermore, it is possible to provide an oil / liquid separation system that is easy to maintain and can reliably separate even in the case of an oil component that is scummed.

  The above problem is the first aspect of the present invention, wherein the floating oil in the storage tank for storing the used oil-containing liquid is sucked by the suction port approached from above, and the suction oil is further floated and separated. This can be solved by an oil-liquid separation method characterized in that:

  In the first aspect of the present invention, 1) The suction port of the suction pipe provided with an air ejector is made to approach the surface of the floating oil component from above, and the air ejector is sucked while maintaining a constant distance from the surface of the floating oil component by the float means. Form of the invention in which suction operation is performed by force, 2) The suction oil component is fed to the floating separation tank and allowed to stand, and the floating oil component that has been floated and separated is intermittently lowered from a discharge pipe provided in the floating separation tank. The present invention can be embodied in the form of the invention of drawing out and discharging.

  Furthermore, the above problem is the second invention of the present invention, and is provided in a storage tank for storing used oil-containing liquid, and includes a suction device and a floating separation tank for separating oil from the used oil-containing liquid. In the oil-liquid separator, the suction device includes a suction pipe provided with suction means capable of sucking the floating oil in the storage tank, and the tip suction port of the suction pipe from above to the surface of the floating oil at a predetermined interval. The floating separation tank is a storage separation tank for floating and separating floating oil from the suction oil sucked by the suction device, and is an oil discharge that discharges the waste liquid overflow pipe and the floating oil. It can also be solved by an oil-liquid separator characterized by comprising a tube.

  In the second aspect of the present invention, an air ejector is provided in the vicinity of the tip of the suction pipe of the suction device, and a float is disposed at a position substantially at the same level as the tip suction port. It is embodied by a configuration in which the height can be raised and lowered, the suction port faces the surface of the floating oil component from above, and suction can be performed while maintaining a constant distance from the surface of the floating oil component.

In addition, an overflow pipe capable of discharging the used liquid portion separated in the lower part and maintaining the level of the liquid in the tank in the floating separation tank for standing and storing the suction oil component fed via the suction device And an oil outlet pipe for extracting the separated floating oil downward is disposed below the overflow level, and the floating oil stored above the outlet is intermittently extracted. It is preferable to provide an open / close valve.
Furthermore, it is preferable to dispose a mesh filter for removing foreign substances such as cutting waste between the outlet of the suction device and the floating separation tank.

Since the oil-liquid separation system of the present invention comprises the first invention and the second invention, there are the following excellent effects. Therefore, the present invention has an extremely large practical value as an oil-liquid separation system that has solved the conventional problems.
1) Since the floating oil in the storage tank for storing the used oil-containing liquid is sucked together with the reduced pressure airflow from the suction port separated upward, the used liquid in the lower layer is relatively difficult to suck, so the oil can be selectively sucked. Excellent separation efficiency.

  2) Since the sucked oil is fed by a suction pipe equipped with an air ejector, it can be fed to the floating separation tank with less contamination of impurities and with no oil adhering to it, so there is no member to be polluted or consumed. The maintenance of the feed line including is advantageous.

  3) In the flotation separation tank, when the floating oil component that has been floated and separated is intermittently pulled down and discharged from the discharge pipe provided in the flotation separation tank, not only the relatively clear oil component with low viscosity but also the scum Even in the case of high-viscosity waste oil, which is easily converted, it can be reliably separated and recovered.

  Next, an embodiment according to the oil-liquid separation system of the present invention will be described. While referring to FIGS. 1 and 2, the second invention which is an apparatus invention will be described, and a first invention which is a method invention will be described. Is also explained.

  As shown in FIGS. 1 and 2, an example of the oil-liquid separator of the present invention is installed in a storage tank (not shown) for storing used oil-containing liquid, and the used oil-containing liquid is used as oil and used liquid. A suction device 2 and a floating separation tank 5 are provided. First, the suction device 2 will be described.

  The suction device 2 is a device that sucks a used oil-containing liquid and feeds it to the subsequent floating separation tank 5, and includes a suction pipe 3 provided with suction means capable of sucking floating oil, and the suction pipe 3. The tip suction port 31 is provided with means capable of approaching the floating oil surface 41 from above at a predetermined interval h. For this purpose, the suction pipe 3 is arranged to be slidable in the longitudinal direction and in the vertical direction in a device fixed outside, for example, the floating separation tank 5.

  In the present invention, it is preferable to provide an air ejector 32 in the vicinity of the tip of the suction pipe 3 of the suction device 2 as the suction means. As the air ejector 32, an ejection nozzle 32 a is arranged in the suction pipe 3, pressurized air is supplied from the air supply pipe 32 b and ejected from the ejection nozzle 32 a, and the inside of the suction pipe 3 is depressurized by the ejection airflow. A device that sucks outside air from the tip suction port 31 can be used.

  Then, as a means for bringing the tip suction port 31 of the suction pipe 3 closer to the floating oil surface 41 at a predetermined interval h, a float 21 having an appropriate material structure may be provided at a position substantially at the same level as the tip suction port 31. That is, it is preferable to attach the float 21 to the fixed arm 33 fixed to the suction pipe 3 so that the height of the float 21 can be adjusted. In FIGS. 1 and 2, the threaded shaft 22 extending upward from the float 21 is screwed to the tip of the fixed arm 33 so that the mounting height can be adjusted, and the position is fixed by a fixing screw 23 such as a thumbscrew.

  Thus, the height of the suction port 31 of the suction pipe 3 can be raised and lowered in response to the vertical movement of the float 21 interlocking with the vertical movement of the water level, so that the suction port 31 faces the floating oil surface 41 from above, In addition, the distance h from the surface of the floating oil component can be maintained constant, and at the same time, the floating oil component can be selectively sucked along with the intake air flow of the outside air by the suction force of the air ejector 32. The interval h itself may be adjusted in the fixing position with the fixing arm 33 according to the suction force so that the floating oil can be efficiently sucked, but is preferably selected in the range of 1 to 8 mm.

  The following baffle plate 34 is preferably provided. That is, the baffle plate which is arranged opposite to the front end suction port 31 and can suck liquid from the left and right directions and obstructs suction from the lower side. 34 is attached to the lower part of the suction pipe 3. The baffle plate 34 is suitably fixed at a position at least 10 mm away from the suction port 31.

  The levitation separation tank 5 is a storage tank for receiving the sucked oil component sucked by the suction device 2 and levitates and separates the oil component and the used liquid that is inevitably sucked and contained, which will be described in detail later. An overflow pipe 7 for used liquid and an oil discharge pipe 6 for discharging floating oil are provided.

  Thus, by using the apparatus of the present invention, the floating oil in the storage tank for storing the used oil-containing liquid is sucked by the suction port 31 of the suction pipe 3 approached from above, and the sucked oil is further used as oil. The first invention of floating and separating into liquid can be implemented, and further, the tip suction port 31 of the suction pipe 3 provided with the air ejector 32 is brought close to the floating oil surface 41 from above, and the floating oil surface Therefore, the floating oil can be selectively suctioned while maintaining the distance h from the nozzle 41 constant by the float 21.

Next, the floating separation tank 5 of the present invention having the overflow pipe 7 and the oil discharge pipe 6 will be described in detail.
First, since the used liquid is inevitably sucked into the suction oil fed from the suction device 2, in the levitation separation tank 5, the suction oil containing the used liquid is allowed to stand and be stored in the upper part. The floating oil component 5a is floated and separated into the separated spent liquid portion 5b at the bottom. The floating separation tank 5 is provided with an overflow pipe 7 for discharging the separated used liquid portion 5b separated at the bottom and maintaining the level H1 of the liquid in the tank. For this reason, the overflow pipe 7 is constituted by a bent pipe having an inlet opening in the separated spent liquid portion 5b, folded back at the level H1 of the liquid in the tank, and opened to the outside.

  Further, an oil discharge pipe 6 for drawing the separated floating oil 5a downward is disposed together with the overflow pipe 7, and its extraction port 61 is arranged below the overflow level H1 and An open / close valve 63 is provided on the outlet side of the oil discharge pipe 6 for intermittently extracting the floating oil stored above the level of the extraction port 61. The oil discharge pipe 6 is a straight pipe having an inner diameter of 20 mm or more in order to enable smooth and rapid drawing, and the position of the drawing port 61 is separated from the inner wall of the floating separation tank 5 so that the oil scum does not form a bridge. It is good to arrange so that it may become a position.

  According to the floating separation tank 5, the suction oil is fed to the floating separation tank 5 by the suction device 2, and is fed until the floated and separated floating oil 5a is accumulated at the level of the extraction port 61 or more. The first invention can be implemented in which the open / close valve 63 is opened at the stage of accumulation and the stored portion is discharged together, that is, the stored floating oil portion 5a is intermittently pulled out from the oil portion discharge pipe 6 and discharged. .

  According to the present invention, floating oil that has accumulated to some extent is drawn from the lower side, so in the case of high-viscosity waste oil that tends to be scummed, the used liquid in the lower part is blocked by solidified scum near the overflow port. Unlike the conventional method of overflowing that part flows out, there is no risk of scum clogging with high viscosity waste oil as in the case of relatively clear oil with low viscosity, and oil-liquid separation is ensured. Benefits are gained.

  In the oil-liquid separator described above, as shown in FIG. 1, a mesh filter 51 is disposed above the floating separation tank 5, and the suction oil component discharged from the outlet 34 of the suction pipe 3 is filtered to be unavoidable. It is preferable to remove impurities such as cutting waste contained in advance. As a mesh filter for this purpose, a net material having an opening according to the size of cutting waste having an opening of 1 mm or more is suitable.

The principal part sectional drawing of the oil-liquid separator for demonstrating this invention. FIG. 3 is a partially cutaway partial cross-sectional view of the oil-liquid separator of the present invention. The principal part sectional drawing of the oil-liquid separator for demonstrating a prior art. The principal part perspective view of the oil-liquid separator for demonstrating another prior art.

Explanation of symbols

2: suction device, 21: float, 22: shaft, 23: fixing screw 3: suction pipe, 31: tip suction port, 32: air ejector, 32a: jet nozzle, 32b: air supply pipe, 33: fixing arm, 34: baffle plate 41: floating oil surface 5: floating separation tank,
h: Interval

Claims (7)

  An oil-liquid separation method characterized by sucking a floating oil component of a storage tank for storing used oil-containing liquid from a suction port approached from above, and further separating the oil component by floating the suction oil component.   A suction operation is performed by the suction force of the air ejector while the tip suction port of the suction pipe provided with the air ejector is approached to the floating oil surface from above and the distance from the floating oil surface is kept constant by the float means. The oil-liquid separation method according to claim 1, wherein   2. The suction oil component is fed to a floating separation tank and allowed to stand, and the floating oil component that has been floated and separated is intermittently pulled out and discharged from a discharge pipe provided in the floating separation tank. 2. The oil-liquid separation method according to 2.   An oil-liquid separator that is installed in a storage tank for storing used oil-containing liquid and includes a suction device and a floating separation tank for separating oil from the used oil-containing liquid, and the suction device includes a storage tank The suction pipe provided with suction means capable of sucking the floating oil component, and means for allowing the tip suction port of the suction pipe to approach the surface of the floating oil component from above from a predetermined distance. A storage / separation tank for floating and separating floating oil from the sucked suction oil, comprising an overflow pipe for waste liquid and an oil discharge pipe for discharging the floating oil.   An air ejector is provided near the tip of the suction pipe of the suction device, and a float is provided at a position substantially the same level as the tip suction port, and the height of the suction port can be raised and lowered in conjunction with the vertical movement of the float. The oil-liquid separator according to claim 4, wherein the oil-liquid separator is disposed so that the suction port faces the surface of the floating oil component from above and can be sucked while maintaining a constant distance from the surface of the floating oil component.   The floating separation tank where the suction oil fed via the suction device is allowed to stand and store is provided with an overflow pipe that discharges the used liquid part separated at the bottom and maintains the liquid level in the tank. And an opening / closing valve for intermittently withdrawing the floating oil stored above the draw-out level, wherein the draw-out port of the oil discharge pipe for drawing the separated floating oil is drawn below the overflow level. The oil-liquid separator according to claim 4 or 5 provided with.   The oil-liquid separator according to any one of claims 4 to 6, wherein a mesh filter for removing foreign substances such as cutting waste is disposed between an outlet of the suction device and the floating separation tank.

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