JP2007167759A - Centrifuge and liquid separating device using it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a centrifuge in which sludge with high specific gravity like machining chips is automatically discharged timely before accumulating much in a rotary bowl. <P>SOLUTION: This separation plate type centrifuge is provided with a vertical rotary shaft 2 driven by a rotary driving means 1, the rotary bowl 3 mounted on the vertical rotary shaft 2 coaxially and integrally rotatably with it, and a treating liquid supply part 5 supplying treating liquid into the rotary bowl 3, and separates the treating liquid A supplied to the rotary bowl 3 into cleaned water a<SB>2</SB>, oil a<SB>1</SB>and sludge a<SB>3</SB>by the action of a centrifugal force caused by the rotation of the rotary bowl 3. Discharge ports 10 are penetratingly provided on the circumferential wall of the rotary bowl 3 with certain intervals in the circumferential direction discharging the sludge a<SB>3</SB>attached on the inner circumferential face of the bowl 3. Each discharge port 10 is provided with a valve mechanism 11 for opening/closing the discharge port in such a manner that a member constituting the valve mechanism 11 does not protrude from the outer circumferential face, penetratedly provided with the discharge port, of the circumferential wall of the rotary bowl 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a centrifuge used to separate coolant waste liquid (treatment liquid) mainly into cutting work of machine tools into clean water, sludge, and oil, and a liquid separation apparatus using the centrifuge. It is.

  In NC lathes and machining centers, water-based coolant is used for blade cooling. However, since lubricating oil is used for the sliding surface of the machine, the lubricating oil flows out and enters the coolant, resulting in deterioration of the coolant performance. Or cause corruption.

  Lubricating oil is lighter than water-based coolant, so many devices have been provided so far, such as adhering and removing floating oil on a rotating disk. However, the efficiency is poor. The most efficient method is a method of separating water and oil using a centrifuge.

  The problem with the centrifuge is that the separation efficiency is good, so a large amount of sludge, which is a solid component with high specific gravity such as cutting powder in the coolant, accumulates in the inside of the rotating bowl, and the separation function stops. In addition, it is necessary to disassemble the machine in a timely manner and to remove internal accumulation, and continuous unmanned operation is not possible. This accumulation (sludge) is sludge-like in viscosity and adheres to the components inside the centrifuge, so it takes much time and labor to disassemble and clean the machine.

  The present invention has been made in view of the above problems, and in a centrifuge, sludge, which is a substance having a high specific gravity such as cutting powder in cutting oil, does not accumulate in a large amount in the rotating bowl, that is, still It is an object of the present invention to provide a mold centrifuge that can be automatically discharged in a small amount in a timely manner, and a liquid separation apparatus using the centrifuge.

Means for solving the above problems will be described with reference numerals of the embodiments described later. A centrifugal separator of the invention according to claim 1 includes a vertical rotation shaft 2 driven by the rotation driving means 1, A rotating bowl 3 attached to the vertical rotating shaft 2 concentrically with the rotating shaft 3 and a processing liquid supply unit 5 for supplying a processing liquid into the rotating bowl 3, and the processing supplied into the rotating bowl 3. A separation plate type centrifugal separator in which liquid A is separated into clean water a ₂ , oil a _1, and sludge a ₃ by the action of centrifugal force generated by rotation of the rotating bowl 3. The discharge ports 10 for discharging the sludge a ₃ adhering to the inner peripheral surface thereof are provided at regular intervals in the circumferential direction, and each discharge port 10 is provided with a valve mechanism 11 for opening and closing the discharge port. Outside the peripheral side wall of the rotating bowl 3 in which the constituent members are formed through the discharge port It is characterized by comprising provided so as not to protrude from the surface.

  According to a second aspect of the present invention, in the centrifugal separator according to the first aspect, the inner peripheral surface of the peripheral side wall of the rotating bowl 3 has a peripheral portion of each discharge port 10 cut into a concave shape, and a bottom portion of the concave portion O. The discharge port 10 is located in the center.

  A third aspect of the present invention is the centrifugal separator according to the first or second aspect, wherein the valve mechanism 11 includes a valve body 13 attached to the discharge port 10 via a spring 12, and the valve body 13 is a centrifugal separator. When the rotating bowl 3 is rotated normally, the centrifugal force acting on the valve body 13 exceeds the urging force of the spring 12 to close the discharge port 10, and the rotational speed of the rotating bowl 3 is reduced to act on the valve body 13. By making the centrifugal force to be lower than the urging force of the spring 12, the discharge port 10 is opened by the spring urging force.

The liquid separator of the invention according to claim 4 includes a processing liquid storage unit 40, a sludge storage unit 41, and a clean water storage unit 50 separately from the centrifugal separator T according to any one of claims 1 to 3. The processing liquid storage section 40 and the sludge storage section 41 are respectively provided with weir plates a and b that allow the supernatant liquid to overflow. The processing liquid from the machine tool side is introduced into the processing liquid storage section 40 and the processing liquid storage section 40 is provided. The supernatant liquid is supplied to the centrifuge T, and the clean water a ₂ separated from the oil a ₁ and the sludge a ₃ by the centrifuge T is introduced into the clean water reservoir 50 and the discharge port 10 of the rotating bowl 3 is supplied. The liquid containing the sludge a ₃ discharged from the sludge is introduced into the sludge reservoir 41, and the supernatant liquid in the sludge reservoir 41 is introduced into the treatment liquid reservoir 40 or the clean water reservoir 50, and the clean water reservoir 50 Configured to supply clean water to the machine tool side Characterized in that it comprises Te.

The effect of the invention by the above-described solution means will be described with reference numerals of embodiments to be described later. According to the centrifugal separator of the invention according to claim 1, the processing liquid A supplied into the rotating bowl 3 is rotated. When the water a ₂ , the oil a ₁ and the sludge a ₃ are separated by the action of the centrifugal force generated by the rotation of the bowl 3, the valve mechanism 11 is opened at an appropriate time to open the discharge port 10. The sludge a ₃ adhering to the inner peripheral surface of the peripheral wall of the rotating bowl 3 can be effectively removed and discharged while being washed away with other water a ₂ or oil a ₁ . Therefore, continuous unattended operation of the centrifuge, which could not be performed conventionally, becomes possible. In this case, the valve mechanism 11 is provided so that the members constituting the valve mechanism 11 do not protrude from the outer peripheral surface of the peripheral side wall of the rotating bowl 3 through which the discharge port is penetrated. Occasionally, an abnormal air flow such as turbulence is not generated in the outer peripheral portion of the peripheral side wall of the rotating bowl 3 through which the discharge port 10 is penetrated. The sludge that is present is smoothly and reliably discharged from the outlet 10 to the outside of the bowl body 7 when the valve mechanism 11 is opened.

According to the centrifugal separator of the invention according to claim 2, the peripheral part of the peripheral side wall of the rotating bowl 3 has the peripheral part of each discharge port 10 formed into a concave shape, and is formed at the center of the bottom of the concave part O. Since the discharge port 10 is positioned, when the sludge a ₃ in the waste liquid A is centrifuged in the bowl body 7 by the rotation of the rotating bowl 3 and adheres to the inner peripheral surface of the peripheral side wall 7a, The sludge a ₃ is easily collected at the center of the bottom of the concave portion O, and the sludge a ₃ collected in the concave portion O is effectively discharged from the discharge port 10 when the valve mechanism 11 is opened.

According to the third aspect of the present invention, the valve body 13 of the valve mechanism 11 is such that the centrifugal force acting on the valve body 13 exceeds the urging force of the coil spring 12 during normal rotation of the rotating bowl 3 for centrifugal separation. By closing the discharge port 10 and reducing the rotational speed of the rotating bowl 3 so that the centrifugal force acting on the valve body 13 is less than the biasing force of the coil spring 12, the discharge port 10 is opened by the spring biasing force. Therefore, when the sludge a ₃ is discharged, it is only necessary to reduce the number of rotations of the rotating bowl 3, so that the machine is not overwhelmed, there is little failure, and when the discharge port 10 is opened, water other than the sludge a ₃ Oil is not discharged unnecessarily, it is easy to carry out post-processing, and it is economical.

According to the liquid separation device of the invention according to claim 4, the spent coolant (treatment liquid) A fed from the machine tool side, effectively separated into an oil a ₁ and clean water a ₂ and sludge a ₃ Te, clean water a ₂ alone can'll supplied to the machine tool side as the coolant, therefore the machine can always use the clean coolant.

A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 (a) is a longitudinal sectional view of a separation plate type centrifuge according to the present invention, and (b) is an arrow X in FIG. Enlarged view of the part shown, (a) in Figure 2
Is a front view of the rotating bowl 3, (b) is a sectional view taken along line YY of (a), (c) is a longitudinal sectional view of the rotating bowl 3 taken along line ZZ of (b), and FIG. It is sectional drawing which shows the state which has opened the mechanism and is discharging the sludge adhering to the peripheral wall inner peripheral surface of a bowl main body. The separation plate type centrifugal separator includes a vertical rotating shaft 2 that is rotationally driven by the rotation driving means 1, a rotating bowl 3 that is attached to the vertical rotating shaft 2 so as to be integrally rotatable therewith, and the rotating bowl. 3 includes a plurality of umbrella-shaped disks 4 arranged at regular intervals in the vertical direction, a processing liquid supply unit 5 for supplying a processing liquid into the rotating bowl 3, and a casing 6 covering the rotating bowl 3.

  As shown in FIG. 1, the rotating bowl 3 includes a bowl body 7, a bottom plate portion 8, and an upper tube portion 9. The bottom plate portion 8 is formed in a raised bottom shape having a substantially trapezoidal cross section, and is rotated vertically. The shaft 2 is concentrically fixed.

  As shown in FIG. 2, the bowl body 7 of the rotating bowl 3 has a discharge port 10 for discharging sludge adhering to the inner peripheral surface of the peripheral side wall 7a to the enlarged thick wall portion 7ao of the peripheral side wall 7a. Six openings are formed at regular intervals in the circumferential direction, for example, at intervals of 60 °, and each outlet 10 is provided with a valve mechanism 11 for opening and closing the outlet. As shown in FIG. 1 (b), each valve mechanism 11 is composed of a spherical valve element 13 attached to the discharge port 10 via a coil spring 12, and this valve element 13 is used for centrifugal separation. During normal rotation of the rotating bowl 3, the centrifugal force acting on the valve body 13 exceeds the biasing force of the spring to close the discharge port, and the centrifugal force acting on the valve body by reducing the rotational speed of the rotating bowl is applied to the spring 12. By making the power lower than the force, the discharge port 10 is opened by the spring biasing force.

  As shown in FIG. 2A and FIG. 3, the inner peripheral surface of the peripheral side wall 7a of the bowl body 7 has a concave portion at the periphery of each discharge port 10, and the bottom of the concave portion O. A discharge port 10 is located in the center.

  The valve mechanism 11 will be described in more detail with reference to FIG. 1B. In the discharge port 10 penetrating the enlarged diameter thick wall portion 7ao of the peripheral side wall 7a, a valve seat is provided at the axially intermediate portion of the inner peripheral surface. The cylindrical valve frame 56 formed with 55 is attached via a tightening ring 57, the spring 12 is disposed on the outlet side in the cylindrical valve frame 56, the valve body 13 is disposed on the inlet side, and the valve body 13 is held by a valve body stopper 58 attached to the inlet side end of the cylindrical valve frame 56 so that it does not jump out of the cylindrical valve frame 56 into the bowl body 7. A ring 59 is attached.

  When the valve mechanism 11 is used, the centrifugal force acting on the valve body 13 exceeds the urging force of the spring 12 when the rotating bowl 3 rotates at a rotational speed of, for example, about 7000 rpm and the processing liquid is centrifuged. In order to compress 12, the valve body 13 is pressed against the O-ring 59 of the valve seat 55 to close the discharge port 10, and when the rotational speed of the rotating bowl 3 is reduced to about 2000 rpm, for example, When the centrifugal force is less than the urging force of the spring 12, the valve body 13 separates the valve body 13 from the O-ring 59 of the valve seat 55 by the urging force of the spring 12 and opens the discharge port 10. The change in the number of rotations and the time setting of the rotating bowl 3 can be arbitrarily and easily set by an inverter for rotation control and microcomputer control.

  Thus, the major feature of the valve mechanism 11 is that any member constituting the valve mechanism 11 is provided so as not to protrude from the outer peripheral surface of the peripheral side wall of the rotating bowl 3 through which the discharge port 10 is provided. That is, as can be seen from the enlarged view of the valve mechanism 11 in FIG. 1, the coil spring 12, the valve body 13, the valve seat 55, the cylindrical valve frame 56, the tightening ring 57, which are members constituting the valve mechanism 11, Both the valve body stopper 58 and the O-ring 59 are provided so as not to protrude from the outer peripheral surface s of the enlarged thick wall portion 7ao of the peripheral side wall 7a of the bowl body 7, and the cylindrical valve frame 56 and the tightening member are tightened. The outer end surfaces of the respective rings 57 are attached so as to be substantially flush with the outer peripheral surface s of the expanded thick wall portion 7ao.

  As described above, if there is no protrusion on the outer peripheral surface s of the thickened thick wall portion 7ao of the bowl body peripheral side wall 7a and the outer peripheral surface s is flush with the entire circumference, the rotating bowl 3 rotates at high speed. Occasionally, an abnormal air flow such as turbulent airflow does not occur around the peripheral side wall of the rotating bowl 3 through which the discharge port 10 is penetrated, so that it adheres to the inner peripheral surface of the peripheral side wall of the bowl body 7. The sludge is smoothly and reliably discharged from the discharge port 10 to the outside of the bowl body 7 when the valve mechanism 11 is opened.

  Further, as shown in FIG. 1 (a), at the upper end portion of the vertical rotating shaft 2, the hollow shaft portion 14a of the rotary support 14 having a substantially T-shaped cross section comprising a hollow shaft portion 14a and a diameter-expanding head portion 14b. Are connected together coaxially, and the diameter-expanding head portion 14 b of the rotary support 14 is in a state of being fitted into the bowl body 7 and the upper tube portion 9 of the rotary bowl 3. A disk holding frame 15 is concentrically and integrally connected to the rotating support 14, and a large number of umbrella-shaped disks 4 are interposed between the disk holding frame 15 and the raised bottom plate 8 of the rotating bowl 3. Are arranged and fixed at regular intervals in the vertical direction.

  Moreover, the casing 6 is being fixed on the base 16 in the state which covered the rotating bowl 3 as shown to (a) of FIG. The base 16 is a fixed member, and the vertical rotation shaft 2 passes through the center of the base 16. The vertical rotation shaft 2 is rotatably supported by the base 16 via a bearing member 65. It is in a state.

  A horizontal pipe 18 and a vertical pipe 19 that form the treatment liquid supply unit 5 are attached to the top of the casing 6 in a cross-shaped state, and the vertical pipe 19 is located above the vertical rotating shaft 2. Located on the same axis. Liquid flow members 20 and 21 are interposed between the vertical duct 19 and the rotary support 14. Reference numeral 22 denotes a cap that covers the upper end side of the vertical pipe line 19. The liquid flow member 20 is a fixed member attached to the horizontal pipe line 18 and the vertical pipe line 19, and the liquid flow member 21 is a diameter expansion head of the upper tube portion 9 of the rotary bowl 3 and the rotary support 14. The rotating member is attached to the portion 14b and rotates together with the rotating bowl 3, and the liquid circulation member 20 functions as a vane pump.

One side of the end portion 18a of the horizontal line 18 across the vertical pipe 19 becomes a feed opening of the processing liquid, the ends 18b of the other side, separated into the oil a ₁ and clean water a ₂ and sludge a ₃ This is a discharge port through which the clean water a ₂ out of the treated liquid is discharged.

  As shown in FIG. 1A, the rotation driving means 1 for rotating the vertical rotation shaft 2 includes a motor 60, a pulley 62 provided on the output shaft 61 of the motor 60, and a pulley provided on the vertical rotation shaft 2. 63, and a timing belt 64 stretched over the belt.

Next, the operation of the centrifugal separator T configured as described above is carried out by using a used waste liquid (treatment liquid) of a water-based coolant used for cutting work of a machine tool as oil a ₁ , clean water a ₂ and sludge a _3. The case where it isolate | separates into is demonstrated.

  As shown in FIG. 4, the used waste liquid of the coolant is stored in the processing liquid storage section 40 through a waste liquid supply pipe 52 extended from the machine tool side, and the waste liquid in the processing liquid storage section 40 is stored in the processing liquid. The supply pipe 42 is supplied to one end portion 18 a of the horizontal pipe line 18 that forms the processing liquid supply section 5 of the centrifuge T. The liquid separator shown in FIG. 4 will be described later.

  In using the centrifuge T, the waste liquid from the processing liquid storage unit 40 is discharged from the processing liquid storage unit 40 while rotating the rotating bowl 3 at a rotational speed of about 7000 rpm, for example. When the waste liquid is supplied to 18a, the waste liquid enters the cap 22 from the communication path 23 of the horizontal pipe 18 and passes through the communication path 24 of the vertical pipe 19 as shown by an arrow A in FIG. , And flows into the bowl body 7 of the rotating bowl 3 from the hanging path 25 of the liquid circulation member 20 through the communication path 26 of the rotating support 14 and the upper side of the disk holding frame 15.

When the waste liquid A flows into the bowl body 7 of the rotating bowl 3 that rotates at a high speed, centrifugal force acts on the particles of the waste liquid, and among the waste liquid A, a large amount of oil a ₁ having a low specific gravity is placed between the disposed disks 4. Through the passage 8a of the raised bottom-like bottom plate portion 8, and from its lower surface side by a drain pipe 44 (see FIG. 4) connected to the drain port 27 of the base 16, The oil is discharged to an oil tank 45 (see FIG. 1) provided outside the centrifuge T.

The clean water a ₂ having a specific gravity greater than that of the oil a ₁ is passed through the inside of the disk holding frame 15 by centrifugal force into the liquid circulation member 21 as indicated by an arrow in FIG. Is sucked into the liquid discharge passage 28 of the liquid circulation member 20 and is discharged to the outside from the discharge port 18b which is the other end of the horizontal pipe 18, and as shown in FIG. Is introduced into the clean water reservoir 50. The sludge a _3, which is a solid component having a higher specific gravity, such as cutting powder in the waste liquid A, forms a sludge and adheres to the inner peripheral surface of the peripheral side wall of the bowl body 7 as shown in FIG. To do.

The sludge sludge a ₃ such as cutting powder adhering to the inner peripheral surface of the peripheral side wall of the bowl body 7 as described above needs to be discharged from the discharge port 10 while the attached amount (accumulated amount) is small. When the rotational speed of the rotating bowl 3 that has been rotated at about 7000 rpm is reduced to, for example, about 2000 rpm at an appropriate time, the valve mechanisms 11 that respectively close the discharge ports 10 are automatically opened. Thus, sludge-like sludge a ₃ adhering to the inner peripheral surface of the peripheral side wall of the bowl body 7 can be discharged. For example, when the centrifugal separation is performed at about 7000 rpm, the rotational speed is reduced to about 2000 rpm after 1 hour, and the state is continued for 2 to 3 minutes, for example.

FIG. 3 shows a state in which the sludge sludge a ₃ adhering to the inner peripheral surface of the peripheral side wall 7 a of the bowl body 7 is discharged by opening the valve mechanism 11. That is, when the rotation of the rotating bowl 3 is about 7000 rpm, for example, the centrifugal force acting on the valve body 13 exceeds the urging force of the coil spring 12, and the valve body 13 closes the discharge port 10. However, when the rotational speed of the rotating bowl 3 is reduced to about 2000 rpm, the centrifugal force of the valve body 13 falls below the biasing force of the spring 12, and the valve body 13 opens the valve body 13 by the biasing force of the spring 12. Thus, sludge sludge a ₃ adhering to the inner peripheral surface of the peripheral side wall of the bowl body 7 is discharged from the discharge port 10 to the outside.

As shown in FIG. 3, by opening the valve mechanism 11, when discharging the sludge-like sludge a ₃ from the discharge port 10, the water and oil components other than the sludge a ₃ is discharged together with the temporary sludge a ₃ since that would be discharged from the outlet 10, these water and oil components, washing away the sludge-like sludge a ₃ attached to the peripheral side wall inner surface of the bowl body 7, effectively remove sludge-like sludge a ₃ whereby It can be discharged. The sludge a ₃ discharged together with the water and oil components from the discharge port 10 in this way is sludge provided outside the centrifuge T by a drain pipe 46 (see FIG. 4) connected to the drain port 29 of the base 16. It is discharged into the tank 41 (see FIG. 4). In FIG. 1, 65 and 66 are outer peripheral sides for effectively guiding the sludge a ₃ discharged together with water and oil components from the discharge port 10 of the bowl body 7 to the drain port 29 of the base 16 so that the sludge a ₃ does not scatter to the periphery. And an inner peripheral side cover.

In this centrifugal separator T, when the centrifugal mechanism is used to provide the valve mechanism 11 that opens and closes the discharge port 10 as described above, the rotational speed of the rotating bowl 3 is, for example, about 7000 rpm. For example, when the rotational speed is reduced to, for example, about 2000 rpm after 1 hour, the centrifugal force acting on the valve body 13 falls below the urging force of the spring 12, and the valve body 13 is automatically opened. the sludge-like sludge a ₃ such as cutting chips adhering to the inner wall 7a circumferential surface, wash the inside of the water and oil components, can be automatically and effectively removed out in time. Therefore, continuous unattended operation of the centrifuge, which could not be performed conventionally, becomes possible.

Moreover, in this centrifuge T, the peripheral part of each discharge port 10 is cut into a concave shape on the inner peripheral surface of the peripheral side wall 7a of the bowl body 7, and the discharge port 10 is formed at the center of the bottom of the concave portion O. When the sludge a ₃ in the waste liquid A is centrifuged in the bowl body 7 by the rotation of the rotary bowl 3 and adheres to the inner peripheral surface of the peripheral side wall 7a, the sludge a 3 ₃ easily collects in the center of the bottom of the concave portion O, and the sludge a ₃ collected in the concave portion O is effectively discharged from the discharge port 10 when the valve mechanism 11 is opened.

Further, the valve body 13 of the valve mechanism 11 rotates when the rotary bowl 3 for centrifugal separation normally rotates, the centrifugal force acting on the valve body 13 exceeds the urging force of the coil spring 12 and closes the discharge port 10 to rotate. By reducing the rotational speed of the bowl 3 so that the centrifugal force acting on the valve body 13 is less than the urging force of the coil spring 12, the spring urging force opens the discharge port 10, and the sludge a ₃ It is only necessary to reduce the number of rotations of the rotating bowl 3 at the time of discharge, so there is no excessive load on the machine, there are few failures, and water and oil other than the sludge a ₃ are unnecessarily discharged when the discharge port 10 is opened. It is economical.

  In the above-described embodiment, the separation plate type centrifuge in which a large number of umbrella-shaped discs 4 are arranged in the rotating bowl 3 at regular intervals in the vertical direction as shown in FIG. 1 has been described. The machine is also applicable to a type not equipped with such a disk 4.

  FIG. 4 shows a liquid separator constituted by using the above-described centrifuge T. This liquid separator is connected to a machine tool such as an NC lathe or a machining center to continuously remove used coolant waste liquid. It comes to purify.

In addition to the above-described centrifuge T, the liquid separator includes a processing liquid storage unit 40, a clean water storage unit 50, and a sludge storage unit 41. As can be seen from FIG. 4, the treatment liquid reservoir 40 and the clean water reservoir 50 are formed by providing a partition wall 67 in the same tank 66, and the supernatant liquid overflows into the treatment liquid reservoir 40. A weir plate a is provided to divide the treatment liquid storage section 40 into a first storage section 40a and a second storage section 40b. The first storage section 40a has coolant waste liquid by a waste liquid feed pipe 52 extending from the machine tool side. A (mixed liquid of oil a ₁ , water a ₂ and sludge a ₃ ) is introduced, and a pump 47 with a strainer 48 is installed in the second reservoir 40b, and the second reservoir 40b The supernatant liquid (mainly a mixed liquid of oil a ₁ and water a ₂ ) is supplied to the processing liquid supply unit 5 of the centrifuge T through the processing liquid supply pipe 42. In the clean water storage section 50, the clean water a ₂ separated by the centrifugal separator T is fed by a clean feed pipe 43 and stored, and the clean water a ₂ collected here is collected by a pump 49 with a strainer 51. The liquid is supplied to the machine tool side through the cleaning liquid supply pipe 53.

The sludge storage part 41 is also provided with weir plates b and c for overflowing the supernatant liquid, and the sludge storage part 41 is partitioned into a first storage part 41a and a second storage part 41b. In the first storage part 41a, The sludge a ₃ (this sludge a ₃ contains water a ₂ and slightly oil) discharged from the discharge port 10 of the rotating bowl 3 of the centrifuge T is introduced into the sludge reservoir 41 and from the weir plate c. reservoir water a ₂ is overflowed supernatant second reservoir 41b, further water a ₂ a supernatant in the second reservoir 41b overflowing weir plate c, clean water by a horizontal supernatant feed pipe 54 It is made to feed to the storage part 50. FIG.

  In addition, although the supernatant liquid in the 2nd storage part 41b of the sludge storage part 41 is sent to the clean water storage part 50 by the supernatant liquid feed pipe 54, the supernatant liquid in the 2nd storage part 41b is In addition, the oil may be supplied to the second storage part 40b or the first storage part 40a of the treatment liquid storage part 40 without being supplied to the clean water storage part 50, so that the oil can be reliably removed. become.

The operation of the liquid separator configured as described above will be described. In the treatment liquid storage unit 40, the coolant waste liquid A from the machine tool side first accumulates in the first storage unit 40a, and here, the sludge a ₃ settles, Oil a ₁ and water a ₂ overflow from the weir plate a and flow into the second reservoir 40b. If the sludge a ₃ is contained in the oil a ₁ and the water a ₂ in the second reservoir 40 b, the sludge a ₃ is treated by the pump 47 via the treatment liquid supply pipe 42 and processed in the centrifuge T. It is supplied to the supply unit 5 and separated by the centrifuge T.

Oil a ₁ and water a ₂ mainly in the second reservoir 40b of the treatment liquid reservoir 40 are supplied to the treatment liquid supply unit 5 of the centrifuge T by the pump 47 via the treatment liquid supply pipe 42. The water a ₂ separated by the centrifugal separator T is introduced into the clean water storage unit 50 through the clean feed pipe 43. Further, the sludge a ₃ discharged from the discharge port 10 of the rotary bowl 3 of the centrifuge T is introduced into the first storage part 41a of the sludge storage part 41, and the supernatant liquid (oil a ₁ is overflowed from the barrier plate b). including but mostly flows into the water a ₂₎ a second reservoir 41b, further supernatant in the second storage unit 41b overflowing weir plate c (mostly water a ₂₎ is the supernatant feed pipe 54 Is fed to the clean water reservoir 50.

In addition, if it is made to return the supernatant liquid in the 2nd storage part 41b overflowed from the 1st storage part 41a of the sludge storage part 41 to the 2nd storage part 40b or the 1st storage part 40a of the process liquid storage part 40, Since the liquid is separated again by the centrifugal separator T, the oil is surely removed, and good clean water a ₂ is always introduced into the clean water reservoir 50.

As described above, the processing liquid A passes through the processing liquid storage section 40, the centrifuge T, and the sludge storage section 41, so that the purified water a ₂ is sufficiently purified and is stored in the clean water storage section 50. However, the purified water a ₂ thus purified is supplied to the machine tool side by the cleaning liquid supply pipe 53.

  According to the liquid separator as described above, the coolant waste liquid A fed from the machine tool side can be effectively separated and purified, and the purified coolant can be supplied to the machine tool side. Accordingly, it is possible to always use clean coolant for the machine tool.

(a) is a longitudinal cross-sectional view of the separator-type centrifuge according to the present invention, and (b) is an enlarged view of a portion indicated by an arrow X in (a). (a) is a front view of the rotating bowl, (b) is a sectional view taken along line YY of (a), and (c) is a longitudinal sectional view of the rotating bowl taken along line ZZ of (b). It is sectional drawing which shows the state which opens a valve mechanism and discharges the sludge adhering to the surrounding wall inner peripheral surface of a bowl main body. It is a partial cross section side view which shows the liquid separator which concerns on this invention.

Explanation of symbols

T Centrifugal separator 1 Rotating drive means 2 Vertical rotating shaft 3 Rotating bowl 4 Disc 5 Processing liquid supply unit 10 Discharge port 11 Valve mechanism 12 Coil spring 13 Valve element A Waste liquid (processing liquid)
a ₁ oil
a ₂ water (clean)
a ₃ Sludge 40 Treatment liquid reservoir 41 Sludge reservoir 50 Clean water reservoir

Claims (4)

Rotating with a vertical rotating shaft driven by a rotation driving means, a rotating bowl attached to the vertical rotating shaft concentrically and integrally therewith, and a processing liquid supply unit for supplying processing liquid into the rotating bowl. A centrifuge that separates the processing liquid supplied into the bowl into clean water, sludge, and oil by the action of centrifugal force generated by rotation of the rotating bowl,
Discharge ports for discharging sludge adhering to the inner peripheral surface of the peripheral wall of the rotating bowl are provided at every required interval in the circumferential direction, and each discharge port has a valve mechanism for opening and closing the discharge port. The centrifugal separator is provided so that the member to be projected does not protrude from the outer peripheral surface of the peripheral side wall of the rotating bowl through which the discharge port is provided.   The inner peripheral surface of the peripheral side wall of the rotating bowl is characterized in that the peripheral portion of each discharge port is cut into a concave shape, and the discharge port is positioned at the center of the bottom of the concave portion. The centrifuge according to 1.   The valve mechanism is composed of a valve body attached to the discharge port via a spring, and this valve body has a centrifugal force acting on the valve body during normal rotation of the rotating bowl for centrifugal separation. The discharge port is closed by exceeding the pressure, and the centrifugal force acting on the valve body is made lower than the biasing force of the spring by reducing the rotation speed of the rotating bowl, so that the discharge port is opened by the spring biasing force. The centrifugal separator according to claim 1 or 2, wherein the centrifugal separator is provided. In addition to the centrifuge according to any one of claims 1 to 3, a weir that includes a processing liquid storage section, a sludge storage section, and a clean water storage section, and causes the supernatant liquid to overflow into the processing liquid storage section and the sludge storage section. Each plate is provided, and the processing liquid from the machine tool side is introduced into the processing liquid storage section, and the supernatant liquid in the processing liquid storage section is supplied to the centrifuge, and the cleanse separated from oil and sludge by the centrifuge Liquid that introduces water into the clean water reservoir and contains sludge discharged from the outlet of the rotating bowl is introduced into the sludge reservoir, and the supernatant liquid in this sludge reservoir is introduced into the treatment liquid reservoir or clean water reservoir. And a liquid separator configured to supply the clean water in the clean water reservoir to the machine tool side.

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