JP6061719B2 - Coolant system - Google Patents

Description

  The present invention relates to a coolant system for filtering and circulating coolant used in a machine tool.

  Patent Documents 1 and 2 describe a configuration in which a tank for storing a coolant and a tank for storing a clean coolant are partitioned in a tank for storing a coolant. Then, the dirty coolant is sent to the filtration device. Here, since the sludge is also included in the clean coolant, the dirty coolant tank and the clean coolant tank are communicated with each other in order to filter again, and a configuration in which both tanks can be sucked by a pump is adopted.

Japanese Patent No. 38975587 JP 2012-125909 A

  In the tank as described above, the dirty coolant is required to be surely delivered to the filtration device by a pump. That is, it is required not to flow out of the dirty coolant tank to the clean coolant tank.

  This invention is made | formed in view of such a situation, and it aims at providing the coolant system which can send out dirty coolant to a filtration apparatus reliably.

(Claim 1) A coolant system according to the present means stores a coolant discharged from a machine tool, a filtration device for filtering the coolant in the tank, and sends the coolant filtered by the filtration device to the machine tool. A first pump and a second pump for delivering the coolant in the tank to the filtration device;
The tank is a tank frame and a cylindrical first partition member provided in the tank frame, and a first dirty tank in which coolant discharged from the machine tool is swung is partitioned inside the first partition member. And a first partition member for partitioning a clean tank to which at least a part of the coolant filtered by the filtration device is supplied to the outside of the first partition member, and a cylindrical shape continuously provided below the first partition member A second partition tank that stores coolant discharged from the first dirty tank, and partitions the clean tank outside the second partition member. A second partition member having an opening communicating the second dirty tank and the clean tank at the lower end of the second partition member, and the second pump suction port disposed inside the second partition member; Provided inside the member It is, and a rectifying plate for partitioning into a plurality of regions of the second dirty tank in the circumferential direction.

(Claim 2) Further, the current plate may divide the second dirty tank into a plurality of regions at equal intervals in the circumferential direction.
(Claim 3) Moreover, it is good for a baffle plate to be provided in parallel with an up-down direction.
(Claim 4) Moreover, the opening part formed in the lower end of a 2nd partition member is good to open over the perimeter of a 2nd partition member.
(Claim 5) Further, a plurality of openings formed at the lower end of the second partition member may be formed at equal intervals in the circumferential direction of the second partition member.

  (Claim 6) When the flow rate per unit time of the coolant supplied from the machine tool to the first dirty tank is set to be smaller than the flow rate per unit time of the coolant sucked from the suction port of the second pump. Good.

  (Claim 1) According to the present means, the dirty coolant supplied to the first dirty tank inside the first partition member is lowered to the second dirty tank inside the second partition member, and then the second pump. Sent to the filtration device. On the other hand, since the opening is provided at the lower end of the second partition member, the clean tank outside the first and second partition members communicates with the second dirty tank inside the second partition member. Therefore, there is a possibility of distribution between the two.

  Here, in the first dirty tank, the coolant discharged from the machine tool is swirled. Therefore, the difference in liquid level can be reduced in the circumferential direction. If it is not swirled, the liquid level of the coolant in the part supplied to the first dirty tank becomes high, and the liquid level in other parts becomes low. However, since the coolant in the first dirty tank is swiveled as described above, the difference in liquid level is small. Therefore, the coolant descending from the first dirty tank to the second dirty tank can reduce the difference in flow rate in the circumferential direction.

  Furthermore, a current plate is provided in the second dirty tank. The second dirty tank is partitioned into a plurality of regions in the circumferential direction by the current plate. Thereby, in the second dirty tank, the difference in the flow rate in the circumferential direction of the coolant can be reduced.

  Thus, by making the first dirty tank a swirl flow and providing the current plate on the second dirty tank, the difference in the flow rate and flow rate of the coolant in the circumferential direction is reduced in the vicinity of the suction port of the second pump. Therefore, the dirty coolant can be reliably delivered to the filtration device by the second pump.

  (Claim 2) By providing the rectifying plate so as to divide the second dirty tank into a plurality of regions at equal intervals in the circumferential direction, the difference in the flow rate in the circumferential direction can be further reduced in the second dirty tank. Thereby, dirty coolant can be more reliably sent to the filtration device by the second pump.

  (Claim 3) By providing the current plate in parallel with the vertical direction, the flow rate in the circumferential direction of the coolant descending from the first dirty tank to the second dirty tank can be made extremely small. As a result, the difference in the circumferential flow velocity in the second dirty tank can be reduced more reliably.

  (Claim 4) The opening at the lower end of the second partition member serves as a passage through which coolant flows from the clean tank to the second dirty tank. Conversely, the opening also serves as a passage through which the coolant flows from the second dirty tank to the clean tank. By opening the opening over the entire circumference of the second partition member, the difference in the flow rate of the coolant flowing from the clean tank into the second dirty tank can be reduced in the circumferential direction at the lower end of the second dirty tank. . As a result, the dirty coolant can be more reliably delivered to the filtration device by the second pump.

  (Claim 5) Even if the openings are not opened over the entire circumference, even if a plurality of openings are formed at equal intervals in the circumferential direction, the second dirty tank can be removed from the clean tank in the circumferential direction at the lower end of the second dirty tank. The difference in the flow rate of the coolant flowing into the tank can be reduced. As a result, the dirty coolant can be sent to the filtration device by the second pump.

  (Claim 6) The flow rate per unit time (hereinafter referred to as unit flow rate) of the coolant supplied from the machine tool to the first dirty tank is smaller than the unit flow rate sucked by the second pump. Therefore, it operates so that the amount of coolant stored in the first and second dirty tanks is reduced. That is, the most dirty coolant discharged from the machine tool is reliably sucked by the second pump.

  Here, the clean tank and the second dirty tank communicate with each other through the opening. Then, by making the unit flow rate sucked by the second pump larger than the unit flow rate supplied to the clean tank, the coolant of the clean tank passes through the opening and moves to the second dirty tank. Therefore, the coolant in the second dirty tank and the coolant in the clean tank are reliably sucked by the second pump.

It is a system configuration figure of a coolant system of an embodiment of the present invention. It is radial direction sectional drawing of the primary tank of FIG. FIG. 6 is an axial sectional view of a partition member (first and second partition members and a current plate) in the primary tank, and is a sectional view taken along the line III-III in FIGS. 4 and 5. It is IV-IV sectional drawing of the division member of FIG. It is VV sectional drawing of the division member of FIG. It is VI-VI sectional drawing of the division member of FIG. 4 and FIG.

(Configuration of coolant system)
The system configuration of the coolant system of the present embodiment will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the coolant system is a system for purifying dirty coolant used in the machine tool 10. In the coolant system, the dirty coolant is purified by performing two-stage filtration, and the purified coolant is returned to the machine tool 10.

  The coolant system includes a recovery tank 20, a pump 30, a primary filtration device 40, a primary tank 50, a pump 60 (corresponding to the “secondary tank” of the present invention), a secondary filtration device 70, a secondary tank 80, and a circulation pump 90. (Corresponding to the “primary tank” of the present invention). The collection tank 20 collects coolant discharged from the machine tool 10, that is, coolant used for machining in the machine tool 10. This coolant contains chips and abrasive grains.

  A suction port of the pump 30 is disposed in the recovery tank 20, and a discharge port of the pump 30 is disposed in the primary filtration device 40. That is, the dirty coolant stored in the collection tank 20 is sent to the primary filtration device 40 by driving the pump 30. A primary separator 40 applies a magnetic separator. However, a filtration device other than the magnet separator can be applied to the primary filtration device 40. The primary filtration device 40 of this embodiment mainly removes metal chips contained in the coolant.

  The coolant from which the metal chips are removed by the primary filtration device 40 is discharged to the primary tank 50 (corresponding to the “tank” of the present invention). That is, the coolant from which the metal chips are removed is stored in the primary tank 50. As shown in FIGS. 1 and 2, the primary tank 50 includes a tank frame 51 and a partition member 52. The tank frame 51 forms an outer frame container. Here, the tank frame 51 is formed in a bottomed cylindrical shape.

  The partition member 52 will be described with reference to FIGS. 3 to 6 in addition to FIGS. 1 and 2. The partition member 52 is provided at the center of the tank frame 51 and partitions the outer peripheral clean tank 110 and the inner peripheral first and second dirty tanks 120 and 130. That is, the clean tank 110 is formed between the inner peripheral surface of the tank frame 51 and the outer peripheral surface of the partition member 52 and is formed in a donut shape.

  Here, the partition member 52 is formed by a first partition member 56, a second partition member 57, and a plurality of rectifying plates 58. The first partition member 56 is formed in a cylindrical shape penetrating in the vertical direction, and is provided at the center of the tank frame 51 and above. The first partition member 56 includes a cylindrical portion 56a and a tapered portion 56b that decreases in diameter from the lower end of the cylindrical portion 56a downward. A circular hole is formed at the lower end of the tapered portion 56b.

  A first dirty tank 120 is partitioned inside the first partition member 56. On the contrary, the clean tank 110 is partitioned outside the second partition member 57. The supply port 45 for supplying the coolant from the primary filtration device 40 to the primary tank 50 is arranged toward the first dirty tank 120. That is, the coolant supplied from the machine tool 10 via the primary filtration device 40 is supplied to the first dirty tank 120 without passing through the clean tank 110.

  Furthermore, the supply port 45 is opened near the radially outer side in the first dirty tank 120 and in a direction parallel to the tangential direction of the nearest cylindrical portion 56a. That is, a swirling flow (counterclockwise in FIG. 2) is generated in the first dirty tank 120 by the coolant supplied from the supply port 45 to the first dirty tank 120. In the first dirty tank 120, the coolant descends from the circular hole of the tapered portion 56b while turning.

  The second partition member 57 is formed in a cylindrical shape penetrating in the vertical direction, and is provided continuously and coaxially below the first partition member 56. The second partition member 57 includes a cylindrical portion 57a and a tapered portion 57b that decreases in diameter from the lower end of the cylindrical portion 57a downward. A circular hole is formed at the lower end of the tapered portion 57b.

  A second dirty tank 130 is partitioned inside the second partition member 57. On the contrary, the clean tank 110 is partitioned outside the second partition member 57. In the second dirty tank 130, the coolant discharged from the first dirty tank 120 is stored.

  A gap is formed between the lower end of the tapered portion 57 b of the second partition member 57 and the bottom portion of the tank frame 51. That is, the second partition member 57 includes an opening 57 c that allows the clean tank 110 and the second dirty tank 130 to communicate with each other. The opening 57c opens over the entire circumference in the circumferential direction. Therefore, the clean tank 110 and the second dirty tank 130 can communicate over the entire circumference of the lower end of the second partition member 57.

  The plurality of rectifying plates 58 are provided inside the second partition member 57, and divide the second dirty tank 130 into a plurality of regions at equal intervals in the circumferential direction. The rectifying plate 58 is formed of a flat plate and is provided in parallel with the vertical direction. Further, the rectifying plate 58 is provided over the entire length of the second partition member 57 in the up-down direction. The rectifying plate 58 may be formed by a spiral plate and twisted in the vertical direction.

  A cylindrical region is formed on the radially inner side of the rectifying plate 58. That is, the current plates 58 are not in contact with each other. Accordingly, the second dirty tank 130 is not completely partitioned in the circumferential direction, but communicates radially inside. Here, the inscribed circle diameter on the radially inner side of the rectifying plate 58 is smaller than the diameter of the circular hole of the tapered portion 56 b of the first partition member 56.

  A suction port 61 of a pump 60 (corresponding to a “second pump” of the present invention) is disposed at the center of the second dirty tank 130, and a discharge port of the pump 60 is disposed in the secondary filtration device 70. That is, the coolant stored in the second dirty tank 130 is sent to the secondary filtration device 70 by driving the pump 60. In particular, the suction port 61 of the pump 60 is disposed at a position near the bottom of the center of the second dirty tank 130. In other words, the suction port 61 of the pump 60 is disposed in the center of the second dirty tank 130 near the lower end of the rectifying plate 58.

  Here, the unit flow rate of coolant (flow rate per unit time) supplied from the supply port 45 to the first dirty tank 120 is set to be smaller than the unit flow rate of coolant sucked from the suction port 61 of the pump 60. That is, in this embodiment, the suction unit flow rate of the pump 30 is set to be smaller than the suction unit flow rate of the pump 60.

  The secondary filter 70 applies a cyclonic filter and removes chips and sludge that were not removed by the primary filter 40. The coolant filtered by the secondary filtration device 70 becomes a sufficiently purified coolant. The coolant filtered by the secondary filtration device 70 is discharged to the secondary tank 80. That is, the secondary tank 80 stores the sufficiently purified coolant. The secondary tank 80 is provided with a temperature adjustment device 81, and the temperature adjustment device 81 cools the coolant in the secondary tank 80 to a constant temperature.

  The secondary tank 80 is provided with a suction port of a circulation pump 90 (corresponding to the “primary pump” of the present invention). The discharge port of the circulation pump 90 is connected to a coolant supply device (not shown) on the machine tool 10 side. ). That is, the coolant stored in the secondary tank 80 is sent to the machine tool 10 by driving the circulation pump 90.

  Here, the unit flow rate of the coolant sucked by the circulation pump 90 is set to be smaller than the unit flow rate of the coolant sucked by the pump 60. Therefore, the amount stored in the secondary tank 80 exceeds the specified amount. The coolant that exceeds the specified amount of the secondary tank 80 is returned from the secondary tank 80 to the primary tank 50. The return supply port 82 from the secondary tank 80 to the primary tank 50 is arranged toward the clean tank 110 of the primary tank 50. That is, the coolant overflowing the secondary tank 80 is supplied to the clean tank 110 without passing through the first and second dirty tanks 120 and 130.

  Further, the return supply port 82 is opened near the radially outer side of the clean tank 110 and in a direction parallel to the tangential direction of the outer peripheral portion of the nearest tank frame 51. That is, a swirl flow (counterclockwise in FIG. 2) is generated in the clean tank 110 by the coolant supplied to the clean tank 110 from the return supply port 82. The swirl flow in the clean tank 110 and the swirl flow in the first dirty tank 120 are in the same direction.

(Coolant system operation)
The operation of the above-described coolant system will be described with reference to FIGS. The case where the machine tool 10 is operating and the case where the machine tool 10 is not operating will be described separately.

(Operation when the machine tool 10 is operating)
First, when the machine tool 10 is operating, the circulation pump 90 and the pumps 30 and 60 are driven. The coolant used by the machine tool 10 is discharged to the recovery tank 20 and sent to the primary filtration device 40 by driving the pump 30. The coolant filtered by the primary filtration device 40 is discharged to the first dirty tank 120 of the primary tank 50.

  In the first dirty tank 120, the coolant (dirty coolant) discharged from the machine tool 10 through the primary filtration device 40 swirls in the first dirty tank 120 and passes through the circular hole at the lower end of the tapered portion 56 b. Lower to the dirty tank 130. Therefore, in the circumferential direction of the first dirty tank 120, the difference in the coolant level can be reduced.

  If it is not swirled, the liquid level of the coolant in the part supplied to the first dirty tank 120 becomes high, and the liquid level in other parts becomes low. However, as described above, since the coolant in the first dirty tank 120 is swirled, the difference in liquid level is small. Therefore, the coolant descending from the first dirty tank 120 to the second dirty tank 130 can reduce the difference in flow rate in the circumferential direction.

  The coolant descending from the first dirty tank 120 to the second dirty tank 130 descends in a state of being partitioned in the circumferential direction by the rectifying plate 58. Here, the second dirty tank 130 is partitioned into a plurality of regions in the circumferential direction by the current plate 58. Thereby, in the 2nd dirty tank 130, the difference of the circumferential flow rate of a coolant can be made small. In particular, in this embodiment, the rectifying plate 58 partitions the second dirty tank 130 into a plurality of regions at equal intervals in the circumferential direction. Therefore, the difference in the circumferential flow velocity of the coolant can be reduced more reliably. Further, chips and sludge contained in the coolant can be evenly divided in the circumferential direction.

  Here, the suction port 61 of the pump 60 is disposed at the center below the second dirty tank 130. Therefore, the coolant that has passed through the current plate 58 is sucked into the pump 60 in the second dirty tank 130. Then, the dirty coolant in the second dirty tank 130 can be reliably delivered to the secondary filtration device 70 by the pump 60.

  Moreover, the opening part 57c is provided in the lower end of the 2nd partition member 57, and the 2nd dirty tank 130 and the clean tank 110 are connecting. Furthermore, the unit flow rate of the coolant supplied from the primary filtration device 40 to the first dirty tank 120 is smaller than the unit flow rate sucked from the second dirty tank 130 by the pump 60. Therefore, the operation is performed so that the amount of coolant stored in the second dirty tank 130 is reduced. That is, the coolant in the clean tank 110 flows into the second dirty tank 130 through the opening 57 c and is sucked by the pump 60.

  Here, in the clean tank 110, the coolant is swirled. Therefore, the floating substance contained in the coolant in the clean tank 110 approaches the center side, that is, the opening 57c side. Therefore, in addition to the dirty coolant in the second dirty tank 130, the coolant including the suspended matter in the clean tank 110 is sent to the secondary filtration device 70 by the pump 60. Then, the coolant filtered by the secondary filtration device 70 is discharged to the secondary tank 80.

  The coolant filtered by the secondary filtration device 70 and stored in the secondary tank 80 is sent to the machine tool 10 by the circulation pump 90. Here, the unit flow rate of the coolant sucked by the circulation pump 90 is smaller than the unit flow rate of the coolant sucked by the pump 60. Accordingly, the coolant stored in the secondary tank 80 exceeds the specified amount of the secondary tank 80. As a result, the secondary tank 80 overflows, and the overflowed coolant is supplied to the clean tank 110 of the primary tank 50.

  Therefore, the flow rate of the coolant in the primary tank 50 is kept almost constant from the relationship between the supply amount to the first dirty tank 120, the suction amount by the pump 60, and the overflow amount from the secondary tank 80.

  Here, as described above, the opening 57 c functions as a flow path through which the coolant flows from the clean tank 110 to the second dirty tank 130. In addition to this, the opening 57 c can also function as a flow path for allowing the coolant to flow from the second dirty tank 130 to the clean tank 110. However, the outflow of the coolant from the second dirty tank 130 to the clean tank 110 is prevented by the following.

  As described above, the first dirty tank 120 is swirled, and the second dirty tank 130 is provided with the rectifying plate 58, so that the difference between the coolant flow rate and the flow rate in the circumferential direction near the suction port 61 of the pump 60. Becomes smaller. Furthermore, the unit flow rate of the coolant supplied from the primary filtration device 40 to the first dirty tank 120 is smaller than the unit flow rate sucked from the second dirty tank 130 by the pump 60.

  By these actions, the coolant of the second dirty tank 130 can be reliably delivered to the secondary filtration device 70 by the pump 60. And the coolant of the clean tank 110 flows into the 2nd dirty tank 130 from the perimeter of the opening part 57c.

  If there is a difference in the coolant flow rate and flow rate in the circumferential direction near the suction port 61 of the pump 60, the opening 57c partially flows from the clean tank 110 into the second dirty tank 130, but the opening 57c. In other parts, the second dirty tank 130 may flow out to the clean tank 110.

  However, in reality, in this embodiment, the difference in the coolant flow rate and flow rate in the circumferential direction can be reduced in the vicinity of the suction port 61 of the pump 60, but it cannot be completely reduced to zero. Therefore, in order to suppress the outflow to the clean tank 110 even if there is a slight difference between the flow velocity and the flow rate, the unit flow rate of the coolant supplied to the first dirty tank 120, the unit flow rate sucked by the pump 60, the opening The gap of the part 57c is adjusted.

  First, the unit flow rate of the coolant supplied to the first dirty tank 120 is made sufficiently larger than the unit flow rate sucked by the pump 60. However, the unit flow rate difference is set not to be too large.

Secondly, the gap of the opening 57c is adjusted according to the following formula. In the formula, Q is a unit flow rate, C and g are constants, A is a sectional area of the opening 57c, and H is a pressure difference between the clean tank 110 and the second dirty tank 130. The cross-sectional area of the opening 57 c corresponds to a cylindrical surface area formed between the lower edge of the second partition member 57 and the bottom of the tank frame 51.
Q = C · A · √ (2g · H)

  That is, in the above formula, the sectional area A of the opening 57c is adjusted so that the unit flow rate Q corresponds to the difference between the unit flow rate of the coolant supplied to the first dirty tank 120 and the unit flow rate sucked by the pump 60. To do.

(Operation when the machine tool 10 is not operating)
Next, when the machine tool 10 is not operating, only the pump 60 is driven, and the circulation pump 90 and the pump 30 are stopped. In this case, the coolant is not supplied from the primary filtration device 40 to the first dirty tank 120 and is not sent from the secondary tank 80 to the machine tool 10.

  In this case, by driving the pump 60, the pump is sent from the second dirty tank 130 to the secondary filtration device 70 and discharged from the secondary filtration device 70 to the secondary tank 80. Since the secondary tank 80 is not sent to the machine tool 10, it overflows beyond the prescribed amount of the secondary tank 80. Then, the coolant in the secondary tank 80 is supplied to the clean tank 110. And it moves to the 2nd dirty tank 130 from the clean tank 110 through the opening part 57c.

  That is, it circulates in order of the clean tank 110 → second dirty tank 130 → secondary filtration device 70 → secondary tank 80 → clean tank 110. During this time, it continues to be purified by passing through the secondary filtration device 70.

<Others>
In the above embodiment, the opening 57 c is opened over the entire circumference of the second partition member 57. In addition, the opening 57c may not be opened over the entire circumference. In this case, the difference in the flow rate of the coolant flowing from the clean tank 110 to the second dirty tank 130 in the circumferential direction at the lower end of the second dirty tank 130 can also be obtained by forming a plurality of openings 57c at equal intervals in the circumferential direction. Can be small. As a result, the coolant of the second dirty tank 130 can be sent to the filtration device by the pump 60.

10: machine tool, 40: primary filtration device, 45: supply port, 50: primary tank, 51: tank frame, 56: first partition member, 57: second partition member, 57c: opening, 58: current plate , 60: pump (second pump), 61: suction port, 70: secondary filtration device, 80: secondary tank, 82: return supply port, 90: pump for circulation (first pump), 110: clean tank, 120: First dirty tank, 130: Second dirty tank

Claims (6)

A tank for storing coolant discharged from the machine tool;
A filtration device for filtering the coolant in the tank;
A first pump for delivering coolant filtered by the filtration device to the machine tool;
A second pump for delivering coolant in the tank to the filtration device;
With
The tank
A tank frame,
A cylindrical first partition member provided in the tank frame body, the first dirty tank turning the coolant discharged from the machine tool is partitioned inside the first partition member, and the filtration The first partition member partitioning a clean tank to which at least a part of the coolant filtered by the apparatus is supplied to the outside of the first partition member;
A cylindrical second partition member provided continuously below the first partition member, the second dirty tank storing the coolant discharged from the first dirty tank inside the second partition member Partitioning the clean tank outside the second partition member, and having an opening communicating the second dirty tank and the clean tank at the lower end of the second partition member, The second partition member which arranges the suction port of the pump inside the second partition member;
A rectifying plate that is provided inside the second partition member and divides the second dirty tank into a plurality of regions in the circumferential direction;
A coolant system comprising:   The coolant system according to claim 1, wherein the current plate divides the second dirty tank into a plurality of regions at equal intervals in a circumferential direction.   The coolant system according to claim 1, wherein the rectifying plate is provided in parallel in the vertical direction.   The coolant system according to any one of claims 1 to 3, wherein the opening formed at the lower end of the second partition member opens over the entire circumference of the second partition member.   The coolant system according to any one of claims 1 to 3, wherein a plurality of the openings formed at a lower end of the second partition member are formed at equal intervals in a circumferential direction of the second partition member. The flow rate per unit time of the coolant supplied from the machine tool to the first dirty tank is set to be smaller than the flow rate per unit time of the coolant sucked from the suction port of the second pump. The coolant system according to any one of 5.

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