JP4775913B2 - Cyclone filter - Google Patents

Description

  The present invention relates to a cyclonic filtration device, and more particularly to a technique for effectively centrifuging foreign matter mixed in a liquid.

  2. Description of the Related Art Conventionally, when grinding with a machine tool, there is a technique for circulatingly using a grinding fluid by removing foreign matters such as grinding scraps and abrasive grains from a used grinding fluid by a regenerator. As this type of regenerator, there is a cyclone type filtration device that centrifuges foreign matter in a grinding fluid. In the cyclonic filtration device, for example, a cyclone main body (separation tank) having a cylindrical portion and a conical portion and having a foreign matter discharge port at the lower end, and a liquid containing the foreign matter are caused to generate a swirling flow in the cyclone main body. A pipe equipped with an introduction pipe to be introduced and an overflow riser pipe (outlet pipe) for guiding the liquid from which the foreign matter has been removed to the outside of the cyclone body, which is arranged at the center of the axis of the swirling flow generated in the cyclone body. It is known (see Patent Document 1).

JP 2003-210908 A

  By the way, the prior art as described in the above-mentioned Patent Document 1 is to remove the foreign matter by performing solid-liquid separation by the centrifugal force of the swirling flow generated in the cyclone body, and the separation ability is the magnitude of the centrifugal force. Will depend on. However, since there are practical restrictions on the discharge pressure of the supply pump that determines the magnitude of the centrifugal force (that is, the flow rate of the liquid containing foreign matter), the inner diameter of the cyclone body, and the like, this makes it possible to use the conventional cyclone type filtration device. There was a certain limit to the separation ability.

  The present invention has been devised in view of the problems of the prior art as described above, and provides a cyclone filtration device that increases centrifugal force with a simple configuration, thereby realizing improvement in separation ability. For the purpose.

  1st invention made | formed in order to solve the said subject is a separation tank (13) which has a cylindrical part (11) and the conical part (12) which is provided in the lower end of this cylindrical part and shrinks toward the downward direction. ), And an introduction pipe (15) for introducing a liquid in a tangential direction of the inner peripheral surface of the cylindrical portion in order to generate a swirling flow in the separation vessel, and accommodated in the separation vessel on the same axis as the cylindrical portion And a discharge pipe (16) for guiding the liquid flowing in from the lower opening from the upper part to the outside of the separation tank, wherein the discharge pipe is rotatable with respect to the separation tank. The driving unit (42) is further provided, which is supported and rotationally drives the outlet pipe in the swirling direction of the swirling flow.

  According to a second aspect of the present invention made to solve the above-described problem, the lead-out pipe may have a blade (51) that imparts swirling energy to the swirling flow on an outer periphery thereof.

According to a third aspect of the present invention for solving the above-described problems, the outlet pipe has a cylindrical shape, and the blade is fixed to the outer peripheral surface of the outlet pipe and extends in the axial direction of the outlet pipe. It can be set as the structure which is a flat plate member.

  According to a fourth aspect of the present invention, there is provided a vertical portion (51a) protruding from the outer peripheral surface of the outlet pipe with a certain width, and a lower end of the vertical portion toward the outer peripheral surface side of the outlet pipe. And an inclined portion (51b) that is inclined so as to narrow the width.

  5th invention made | formed in order to solve the said subject can be set as the structure which has the site | part in which the said blade | wing is not provided in the lower part.

  According to the first aspect of the present invention, the centrifugal force is increased by promoting the swirling by the simple configuration of rotating the outlet tube in the swirling direction of the swirling flow, thereby realizing an improvement in separation capability. Has an effect. By increasing the centrifugal force, it is possible to capture fine particles having a relatively low specific gravity. According to the second aspect of the invention, the effect of promoting the swirling of the swirling flow can be enhanced, and the centrifugal force can be increased and the separation performance can be improved more stably. According to the third aspect of the invention, the effect of imparting swirling energy to the swirling flow can be enhanced by the outlet tube having a simple configuration. According to the fourth and fifth aspects of the invention, the generation of turbulence near the opening located below the outlet pipe is suppressed, and the liquid guided to the outlet pipe (that is, the liquid after the foreign matter has been removed) It is possible to prevent foreign matters from entering.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of a filtration system employing a cyclone type filtration device according to the present invention, FIG. 2 is a sectional view showing a detailed configuration of the cyclone type filtration device, and FIG. 3 is a sectional view taken along line AA in FIG. It is.

  This filtration system 1 is for circulating and using a grinding fluid used in a machine tool 2, and the grinding fluid used in the machine tool 2 is supplied by a supply pump 3 through a forward pipe 4 to a cyclone type filtration device (hereinafter referred to as a filtration device). , Simply referred to as “filtering device”) 5, where foreign matter (grinding scraps, abrasive grains, etc.) in the grinding fluid is removed, and then returned from the filtering device 5 to the machine tool 2 via the return pipe 6. To be reused.

  As shown in FIG. 2, the filtration device 5 includes a separation tank 13 including a cylindrical portion 11 and a conical portion 12 that is fastened to the lower end of the cylindrical portion 11 and has a shape that is contracted downward. The separation tank 13 is supported by a support body 14 made of an angle material. An introduction pipe 15 for introducing a grinding liquid containing foreign matter from the forward pipe 4 is connected to the upper part of the cylindrical part 11, and the grinding liquid is introduced in the tangential direction of the inner peripheral surface of the cylindrical part 11 and swivels in the separation tank 13. Create a flow. Further, in the separation tank 13, a lead-out pipe 16 that guides the grinding liquid after removing foreign matters flowing from the opening 16 a at the lower end to the outside of the separation tank 13 is provided. Here, the opening 16 a is provided at the lower end of the outlet pipe 16, but a configuration in which the opening is provided on the outer peripheral surface of the lower part of the outlet pipe 16 is also possible.

  A valve 17 is attached to the lower end of the conical portion 12, and the normally closed valve 17 is appropriately opened according to the accumulation state of the foreign matter in the conical portion 12, thereby discharging the accumulated foreign matter to the collection container 18. It is possible to make it.

  The outlet tube 16 has a cylindrical shape and is arranged coaxially with the cylindrical portion 11 of the separation tank 13. An elbow 22 is attached to the upper end of the outlet pipe 16, and an outer pipe 23 connected to the return pipe 6 is connected to the elbow 22. The outer tube 23 is supported by the support 14 via the frame 24.

  Further, the outlet pipe 16 is rotatable with respect to the separation tank 13 by bearings 32 and 33 provided on the support body 31 connected to the upper end of the separation tank 13 and a bearing 34 provided on the lower part of the elbow 22. Supported. The upper wall 13a of the separation tank 13 is provided with a seal portion 35 that seals between the outlet pipe 16 and the opening through which the outlet pipe 16 passes. A pulley 41 is attached to the upper part of the outlet pipe 16, and the power of the motor is transmitted by a belt 44 wound around the pulley 43 on the motor (driving means) 42 side, so that the outlet pipe 16 is Driven by rotation. The motor 42 is supported on the support 14 via a motor support plate 45 and a frame 46. The operation of the motor 42 is controlled by a control device (not shown).

  As shown in FIG. 3, the outer peripheral surface of the outlet pipe 16 is provided with blades 51 for imparting swirling energy to the swirling flow of the grinding fluid by its rotating operation. Each of the blades 51 is formed of a metal material or resin material having high wear resistance, and one side edge is connected to the outer peripheral surface of the outlet pipe 16 and extends in the axial direction of the outlet pipe 16 (here, 8) flat plate members, which are arranged at predetermined angular intervals in the circumferential direction so as to protrude in the radial direction from the outer circumferential surface of the outlet pipe 16. The attachment of the blades 51 to the outlet pipe 16 can be performed, for example, by welding or fastening with screws.

  The blade 51 includes a vertical portion 51a that protrudes from the outer peripheral surface of the outlet tube 16 with a certain width, and an inclined portion 51b that is inclined so as to narrow the width from the lower end of the vertical portion 51a toward the outer peripheral surface of the outlet tube 16. Have. Thereby, the swirling energy given to the swirling flow toward the lower side of the separation tank 13 is gradually reduced to suppress the generation of turbulent flow in the vicinity of the opening 16 a located at the lower portion of the outlet pipe 16 and flow into the outlet pipe 16. It is possible to prevent foreign matters from entering the clean grinding fluid. Furthermore, the turbulent flow near the opening 16a of the lead-out pipe 16 is generated by securing a certain area where the blade 51 is not provided at the lower part of the lead-out pipe 16 without providing the blade 51 up to the tip of the lead-out pipe 16. It can suppress more reliably.

  The shape, quantity, arrangement, and the like of the flat plate member constituting the blade 51 provided in the outlet pipe 16 can be variously changed according to the filtration performance required by the apparatus to which the present invention is applied. For example, as shown in FIG. 4, the number of flat plate members is reduced, and the flat plate member is shifted from the state in which the lead-out pipe 16 protrudes substantially in the radial direction as shown in FIG. Can be provided. Moreover, the structure which abbreviate | omitted the blade | wing 51 is also possible, and the external shape of the derivation | leading-out pipe | tube 16 can be made into polygons other than circular in that case.

  In the filtration device 5 having the above-described configuration, as shown by the arrow in FIG. 5, the grinding fluid containing the foreign material flows in the tangential direction of the inner peripheral surface of the separation tank 13 from the introduction pipe 15 by the discharge pressure of the supply pump, It flows down as a swirl flow along the inner peripheral surface of the part 11. At this time, since the outlet pipe 16 is rotationally driven by the motor in the same direction as the swirling flow, the swirling flow is given energy from the blades 51 and the flow velocity is increased.

  The foreign matter 61 in the grinding fluid receives a centrifugal force due to the swirling flow due to the specific gravity difference between the grinding fluid and the foreign matter, and moves to the inner peripheral surface side of the cylindrical portion 11. Thereafter, the swirling flow reaches the lower portion of the cylindrical portion 11 and the swirling speed is reduced, while the foreign matter 61 is separated from the flow of the grinding liquid and is deposited on the conical portion 12. The clean grinding liquid from which the foreign matter 61 has been removed is guided out of the separation tank 13 from the opening 16a of the outlet pipe 16 so as to be pushed out by the grinding liquid continuously introduced from the inlet pipe 15. This clean grinding fluid is sent to the machine tool through the return pipe and reused.

  As described above, in the filtration device 5 of the present embodiment, an increase in centrifugal force and an improvement in separation performance are realized, and a foreign matter having a relatively small particle size or a comparatively small difference in specific gravity from the grinding fluid (for example, a grindstone) Can also be removed. In addition, this filter device 5 has an advantage that no filter is used for the filtration process, and there is no cost due to periodic replacement of the filter. Furthermore, the operation rate does not decrease or the continuous operation is not hindered due to clogging of the filter due to continuous use or a decrease in separation ability.

  Although the present invention has been described in detail based on specific embodiments, these embodiments are merely examples, and the present invention is not limited to these embodiments. For example, the cyclonic filtration device of the present invention can be used for processing various liquids including foreign substances as well as the above-mentioned grinding liquid for machine tools. Further, the foreign matter does not necessarily need to be a solid, and may be a liquid having a specific gravity difference from the liquid to be processed (grinding liquid or the like). Further, it can be used in combination with another apparatus (wet magnetic separator or the like) having a function of removing foreign substances from the grinding fluid.

The block diagram of the filtration system which employ | adopted the cyclone type filter apparatus which concerns on this invention Sectional drawing which shows the structure of a cyclone filter AA sectional view of FIG. Sectional drawing which shows the example of a change of the blade | wing of FIG. Schematic diagram showing the flow of grinding fluid in the separation tank

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Filtration system 3 Supply pump 4 Outgoing pipe 5 Cyclone-type filtration apparatus 6 Return pipe 11 Cylindrical part 12 Conical part 13 Separation tank 15 Introducing pipe 16 Outlet pipe 18 Collection | recovery container 31 Support trunk | drum 32,33,34 Bearing 42 Motor 51 Blade

Claims (2)

A separation tank having a cylindrical portion and a conical portion provided at the lower end of the cylindrical portion and contracted downward;
An introduction pipe for introducing a liquid in a tangential direction of the inner peripheral surface of the cylindrical portion in order to generate a swirling flow in the separation tank;
A cyclone type filtration device comprising a lead-out pipe that is accommodated in the separation tank coaxially with the cylindrical portion and guides the liquid flowing in from the lower opening from the upper part to the outside of the separation tank,
The outlet pipe is rotatably supported with respect to the separation tank, and further includes a driving unit that rotationally drives the outlet pipe in the swirling direction of the swirling flow .
The outlet pipe has a cylindrical shape, and has vanes on its outer periphery for imparting swirl energy to the swirl flow,
The blades are a plurality of flat plate members fixed to the outer peripheral surface of the outlet pipe and extending in the axial direction of the outlet pipe,
The flat plate member has a vertical part protruding from the outer peripheral surface of the outlet pipe with a certain width, and an inclined part inclined so that the width is narrowed from the lower end of the vertical part toward the outer peripheral surface side of the outlet pipe. The cyclone type filtration apparatus characterized by the above-mentioned. The cyclonic filtration device according to claim 1 , wherein the lead-out pipe has a portion where the blade is not provided at a lower portion thereof.

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