JP2019150903A - Liquid storage device - Google Patents

Abstract

To provide a liquid storage device configured to prevent a coolant from leaking out.SOLUTION: The liquid storage device comprises: a storage tank for storing a coolant not yet used in a machine tool; a lid for covering an upper side of the storage tank; a supply path for a coolant penetrating through the lid; a supply port through which a coolant is supplied through the supply path into the storage tank; a drainage pipe, whose both ends are formed in an opening tube-shape, which is arranged in the storage tank in a vertical state and whose upper end is positioned at a position not opposing to the supply port and whose lower end is positioned below a bottom of the storage tank, where a coolant flowing in from the upper end is drained to the outside of the storage tank through the bottom of the storage tank; and a surrounding part, whose lower end is formed in an opening tube-shape, which is arranged in the storage tank in a vertical state and which surrounds the upper end of the drainage pipe and the supply port therein, and whose upper end is connected to a lower surface of the lid and whose lower end is lower than the upper end of the drainage pipe and higher than the bottom of the storage tank.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a storage device that stores a coolant used by a machine tool.

  Machine tools perform many types of machining by changing tools. The machine tool stores the tool held in the tool holder. A machine tool attaches a tool to a spindle by mounting a tool holder holding a tool on the spindle. The tool rotates by the movement of the spindle, and the machine tool executes machining. The machine tool appropriately replaces a tool to be used from a plurality of types of tools.

  The main shaft is located inside a processing chamber of the machine tool. Inside the processing chamber, there are chips generated by processing. Chips may adhere to the tool holder before being mounted on the spindle. When chips adhere to the tool holder, the tool cannot be positioned correctly due to the influence of the chips. For example, when the spindle moves in a state where the tool is not correctly positioned, the tool rotates in an eccentric state, and the machining accuracy decreases. In addition, when the amount of chips attached is large, the tool cannot be attached to the spindle.

  In order to solve such a problem, the machine tool includes a tool cleaning device. The tool cleaning device cleans the tool by using a coolant for cooling the tool and the workpiece as a cleaning liquid. The tool cleaning device cools the tool and the workpiece by ejecting a coolant to the tool and the workpiece during the machining operation. The tool cleaning device cleans the tool and the tool holder by ejecting a coolant to the tool holder and the tool before being mounted on the spindle when the tool is replaced. The tool cleaning device removes chips adhering to the tool holder by cleaning. Patent Document 1 discloses an example of a tool cleaning device.

  The liquid storage device stores the cleaning liquid used by the tool cleaning device. The liquid storage apparatus includes a cleaning liquid tank. The tank is provided with a lid. The lid is provided with an opening, and a decompression tank is provided in the opening. The coolant flows into the tank through the decompression tank. The decompression tank slows the flow of the coolant.

Japanese Patent Laid-Open No. 2015-1000085

  When the coolant flows into the tank, the coolant is decelerated by the decompression tank, but maintains a certain speed. For this reason, when the cooling liquid flows on the liquid level of the cooling liquid in the tank, the cooling liquid may rebound on the liquid level. When the liquid level is high to some extent, the bounced coolant may leak from the gap between the tank side wall and the lid.

  This invention is made | formed in view of such a situation, The place made into the objective is providing the liquid storage apparatus which prevented that the cooling fluid leaked out.

  A liquid storage apparatus according to the present invention includes a storage tank that stores a coolant before being used in a machine tool, a lid that closes the upper side of the storage tank, a supply path of a coolant that passes through the cover, and the supply In a liquid storage device comprising a supply port for supplying a coolant passing through a passage into the storage tank, both ends of the liquid storage apparatus are open, arranged vertically in the storage tank, and an upper end at the supply port A drainage pipe that is in a position that does not face, the lower end is at a position below the bottom of the storage tank, and the coolant flowing in from the upper end passes through the bottom of the storage tank and is discharged to the outside of the storage tank; The lower end is an open cylindrical shape, and is arranged vertically in the storage tank, surrounds the upper end of the drainage pipe and the supply port, and the upper end is connected to the lower surface of the lid, An enclosure having a lower end lower than an upper end of the drainage pipe and higher than a bottom of the storage tank; Characterized in that it comprises.

  In the present invention, the liquid storage device has a cylindrical enclosure surrounding the drainage pipe inside the storage tank. The upper end of the enclosure is connected to the lower surface of the lid, and the lower end of the enclosure is at a position lower than the upper end of the drainage pipe and higher than the bottom of the storage tank. The coolant that bounces off at the liquid level stays inside the enclosure and hardly leaks outside the enclosure. Further, the generated bubbles stay inside the enclosure, and the cooling liquid hardly leaks outside the enclosure even in the state of bubbles.

  The liquid storage device according to the present invention further includes a drainage tank for storing the coolant after being used in the machine tool, and the drainage tank is disposed below the storage tank, and The liquid pipe penetrates the bottom of the storage tank, and the lower end of the drain pipe is located in the drain tank.

  In the present invention, the drainage tank is located below the storage tank, and the lower end of the drainage pipe is located in the drainage tank. When there is a lot of cooling liquid, the cooling liquid flows through the drain pipe and flows out into the drain tank. Thus, the liquid storage device prevents the coolant from overflowing from the storage tank.

  In the liquid storage apparatus according to the present invention, the supply path includes a decompression tank that decelerates the flow of the coolant, the decompression tank is disposed through the lid, and the supply port includes the It is provided in the lower surface of the decompression tank, The said enclosure part has enclosed the lower surface of the said decompression tank inside, It is characterized by the above-mentioned.

  In the present invention, the coolant supply path includes a decompression tank. The coolant flows into the storage tank from the supply port on the lower surface of the decompression tank. The enclosure part encloses the lower surface of the decompression tank inside. The decompression tank suppresses the rebound of the coolant by slowing the flow of the coolant. In addition, since the supply port is inside the enclosure, the coolant that rebounds from the liquid level remains inside the enclosure.

  The liquid storage apparatus according to the present invention is characterized in that an upper portion of the drainage pipe has a shape in which an opening area continuously increases toward an upper end.

  In the present invention, the upper part of the drainage pipe extends toward the upper end. For this reason, when the liquid level of the cooling liquid exceeds the upper end of the drainage pipe, the cooling liquid easily flows into the drainage pipe from the upper end and flows out.

  The liquid storage device according to the present invention protrudes from the inner surface of the enclosure part at a position lower than the upper end of the drainage pipe, and has a rib having a surface intersecting in the vertical direction, or a position higher than the lower end of the enclosure part. It further comprises a rib projecting from the outer surface of the drainage pipe and having a surface intersecting in the longitudinal direction.

  In the present invention, the liquid storage device includes a rib protruding from the inner surface of the enclosure or a rib protruding from the outer surface of the drainage pipe. When bubbles generated inside the enclosure sink below the liquid level, the bubbles collide with the ribs and it is difficult to sink below. For this reason, it becomes difficult for the bubbles to sink below the lower end of the enclosure and move to the outside of the enclosure.

  The liquid storage device according to the present invention has a cylindrical shape with an open upper end, is disposed vertically in the storage tank, surrounds a part of the drainage pipe, and the upper end of the enclosure It is further provided with a cylindrical body which is located at a position lower than the upper end of the drainage pipe and higher than the lower end of the enclosure and whose lower end is connected to the bottom of the storage tank.

  In the present invention, the liquid storage device includes a cylindrical body that encloses the drainage pipe inside the enclosure. The upper end of the cylindrical body is lower than the upper end of the drainage pipe, and the lower end of the cylindrical body is connected to the bottom of the storage tank. When the foam generated inside the enclosure sinks below the liquid level, a part of the sinked foam enters the inside of the cylindrical body and cannot move to the outside of the enclosure. For this reason, it is less likely that the submerged foam moves to the outside of the enclosure.

  The liquid storage device according to the present invention has a cylindrical shape with an open upper end, is disposed vertically in the storage tank, surrounds a part of the drainage pipe, and the upper end of the enclosure It further comprises a cylindrical body that is located at an inner side lower than the upper end of the drainage pipe and higher than the lower end of the enclosure, and whose lower end is blocked by a bottom part protruding from the outer surface of the drainage pipe. And

  In the present invention, the liquid storage device includes a bottomed cylindrical body that surrounds the drainage pipe inside the enclosure. The upper end of the cylindrical body is lower than the upper end of the drainage pipe, and the bottom of the cylindrical body protrudes from the outer surface of the drainage pipe. When the foam generated inside the enclosure sinks below the liquid level, a part of the sinked foam enters the inside of the cylindrical body and cannot move to the outside of the enclosure. For this reason, it is less likely that the submerged foam moves to the outside of the enclosure.

  In the present invention, since the coolant jumps up inside the enclosure, it is difficult for the coolant to leak from the gap between the side wall of the storage tank and the lid. Therefore, the liquid storage device has excellent effects such as preventing the coolant from leaking out.

It is a typical perspective view showing a machine tool and a liquid storage device. It is a typical top view of a part of liquid storage device. FIG. 3 is a schematic cross-sectional view of a part of the liquid storage device according to the first embodiment. FIG. 3 is a schematic cross-sectional view of a part of the liquid storage device according to the first embodiment. It is typical sectional drawing of the liquid storage apparatus which is not provided with the enclosure part. FIG. 6 is a schematic cross-sectional view of a part of the liquid storage device according to the second embodiment. FIG. 6 is a schematic cross-sectional view of a part of a liquid storage device according to a third embodiment. FIG. 6 is a schematic cross-sectional view of a part of a liquid storage device according to a fourth embodiment. FIG. 6 is a schematic cross-sectional view of a part of a liquid storage device according to a fifth embodiment.

Hereinafter, the present invention will be specifically described with reference to the drawings showing embodiments thereof.
(Embodiment 1)
FIG. 1 is a schematic perspective view showing a machine tool 2 and a liquid storage device 1. In the drawing, a schematic outer shape of the machine tool 2 is indicated by a broken line. The machine tool 2 has a plurality of types of tools, and performs processing using the respective tools. Moreover, the machine tool 2 cools and cleans a tool and a workpiece using a coolant. For example, the coolant is aqueous or oily. The liquid storage device 1 includes a first tank 11 (see FIGS. 3 and 4) for storing the used coolant and a second tank 12 (see FIGS. 3 and 4) for storing the coolant before use. I have. The machine tool 2 ejects the coolant to the tool and the workpiece, and sends the used coolant to the liquid storage device 1. The liquid storage device 1 stores the used coolant in the first tank 11 and appropriately sends it to the machine tool 2. The machine tool 2 passes the sent coolant through a filter (not shown). The filter removes foreign substances from the coolant, and the coolant returns to the state before use. The machine tool 2 stores the coolant after passing through the filter in a storage container (not shown) and sends it to the liquid storage device 1. The liquid storage device 1 stores the sent cooling liquid in the second tank 12 and sends it to the machine tool 2 as necessary. The machine tool 2 ejects the delivered coolant to the tool and the workpiece. In this way, the machine tool 2 repeatedly uses the coolant.

  FIG. 2 is a schematic plan view of a part of the liquid storage device 1. 3 and 4 are schematic cross-sectional views of a part of the liquid storage device 1 according to the first embodiment. 3 shows a cross section of the liquid storage device 1 cut along the line III-III in FIG. 2, and FIG. 4 shows a cross section of the liquid storage device 1 cut along the line IV-IV in FIG. The liquid storage apparatus 1 includes a first tank 11 that stores a used coolant and a second tank 12 that stores a coolant before use. The first tank 11 corresponds to a drain tank, and the second tank 12 corresponds to a storage tank. The first tank 11 and the second tank 12 are box-shaped, and the first tank 11 is located below the second tank 12.

  A lid 13 is closed on the upper side of the second tank 12. The lid 13 has a flat plate shape. A pump 18 for conveying the coolant in the second tank 12 to the machine tool 2 is located on a part of the lid 13. The lid 13 has an opening 131. The liquid storage device 1 includes a decompression tank 14, and the decompression tank 14 closes the opening 131. The decompression tank 14 has a flange 143. The flange 143 overlaps the edge of the opening 131. The flange 143 and the edge of the opening 131 are screwed.

  The decompression tank 14 has a box shape. A connection port 142 is opened on the upper surface of the decompression tank 14. The coolant supply pipe 15 is connected to the connection port 142. The supply pipe 15 is connected to the machine tool 2. The coolant flows from the machine tool 2 to the decompression tank 14 through the supply pipe 15. The coolant that has passed through the supply pipe 15 flows into the decompression tank 14 from the connection port 142. The lower surface of the decompression tank 14 protrudes downward from the lower surface of the lid 13. On the lower surface of the decompression tank 14, there is a supply port 141 for supplying the coolant into the second tank 12. The supply port 141 is disposed inside the second tank 12. The coolant that has flowed into the decompression tank 14 flows into the second tank 12 from the supply port 141. The supply pipe 15 and the decompression tank 14 constitute a coolant supply path.

  The decompression tank 14 has a cross-sectional area sufficiently larger than the connection port 142. The cooling liquid spreads as it flows into the decompression tank 14 from the connection port 142, and the pressure and speed of the cooling liquid decrease. The decompression tank 14 has a plurality of plates therein. The plurality of plates alternately protrude from the inner surface to the inside of the decompression tank 14. The coolant flows while coming into contact with the plurality of plates sequentially, and decelerates. The coolant flows into the second tank 12 from the supply port 141 in a decelerated state. In the drawing, the path of the coolant flowing into the second tank 12 through the supply pipe 15 and the decompression tank 14 is indicated by solid arrows.

  The liquid storage device 1 includes a cylindrical drain pipe 16 having both ends opened in the second tank 12. The drainage pipe 16 is vertically oriented. The vertical direction corresponds to the vertical direction. The drainage pipe 16 is at a position where the upper end does not face the supply port 141. That is, the coolant supplied from the supply port 141 does not directly flow into the drain pipe 16. The drainage pipe 16 penetrates the lower surface of the second tank 12 and the upper surface of the first tank 11. The lower end of the drain pipe 16 is located in the first tank 11. The upper end of the drainage pipe 16 is higher than the center of the second tank 12 in the vertical direction and is located near the lid 13. However, a certain amount of space exists between the upper end of the drainage pipe 16 and the lower surface of the lid 13 or the lower surface of the decompression tank 14.

  The second tank 12 stores the coolant flowing in from the supply port 141. The pump 18 sends the coolant to the machine tool 2 as necessary. When the liquid level of the stored cooling liquid exceeds the upper end of the drainage pipe 16, a part of the cooling liquid flows into the drainage pipe 16 from the upper end. The inflowing coolant passes through the drain pipe 16 and flows out to the first tank 11. That is, when too much coolant flows into the second tank 12, the coolant flows out of the second tank 12 through the drain pipe 16. In this way, the liquid storage device 1 prevents the coolant from overflowing from the second tank 12.

  Furthermore, the liquid storage device 1 includes a cylindrical enclosure 17 that surrounds the drainage pipe 16 in the second tank 12. The enclosure 17 has a cylindrical shape with an open lower end and is vertically oriented. The inner diameter of the enclosure 17 is larger than the outer diameter of the drainage pipe 16 and the lateral size of the decompression tank 14. The enclosure part 17 is arrange | positioned in the position which encloses the upper end of the drainage pipe | tube 16, and the lower surface of the pressure reduction tank 14 from a horizontal direction. The horizontal direction corresponds to the left-right direction and the front-rear direction. The upper end of the enclosure 17 is connected to the lid 13. For example, the upper end of the enclosure 17 is welded to the lower surface of the lid 13. The lower end of the enclosure 17 is lower than the upper end of the drainage pipe 16 and higher than the bottom of the second tank 12. Accordingly, the upper end of the drain pipe 16 and the supply port 141 are located inside the enclosure 17. The lower end of the enclosure 17 is lower than the center of the second tank 12 in the up-down direction and is close to the bottom of the second tank 12. However, a certain amount of space exists between the lower end of the enclosure 17 and the bottom of the second tank 12. The coolant flowing into the second tank 12 from the supply port 141 passes through the gap between the lower end of the enclosure 17 and the bottom of the second tank 12 and accumulates in the second tank 12.

  FIG. 5 is a schematic cross-sectional view of a liquid storage device that does not include the enclosure 17. When the cooling liquid flows into the second tank 12, the cooling liquid may rebound on the liquid level. When the liquid level of the cooling liquid rises and the liquid level is located near the lid 13 without exceeding the upper end of the drainage pipe 16, the bounced cooling liquid is repelled in the second tank without the enclosure 17. It may leak from the gap between the 12 side walls and the lid 13. In FIG. 5, the movement of the rebounding coolant is indicated by broken line arrows. In addition, bubbles may be generated when the coolant flows into the liquid surface. The generated bubbles stay above the liquid level. The coolant may bounce off with bubbles and leak. In addition, the flowing coolant may push the bubbles, and the coolant may leak out in the form of bubbles.

  Unlike the liquid storage device shown in FIG. 5, in the present embodiment, as shown in FIG. 4, the supply port 141 is located inside the enclosure 17, so that the coolant rebounds inside the enclosure 17. In FIG. 4, the movement of the rebounding coolant is indicated by broken line arrows. The decompression tank 14 suppresses the rebound of the coolant and the generation of bubbles to some extent by slowing the flow of the coolant. Although the bounced cooling liquid collides with the lower surface of the decompression tank 14, the lower surface of the lid 13, or the inner surface of the enclosure portion 17, the upper end of the enclosure portion 17 is connected to the lower surface of the lid 13. Is difficult to leak. By connecting the lid 13 and the decompression tank 14 without gaps, the liquid storage device 1 prevents the coolant from leaking out from the lid 13. Further, if the lid 13 and the upper end of the enclosure portion 17 are connected without a gap, the coolant is unlikely to leak out of the enclosure portion 17. Even if the coolant leaks to the outside of the enclosure part 17, the momentum of the bounced coolant is attenuated inside the enclosure part 17, and the coolant flows from the gap between the side wall of the second tank 12 and the lid 13. Is very difficult to leak.

  Further, bubbles are generated inside the enclosure portion 17 and the bubbles stay on the liquid surface, so that the bubbles remain inside the enclosure portion 17. By connecting the lid 13 and the decompression tank 14 without a gap, the liquid storage device 1 prevents the coolant from leaking out from the lid 13 in the form of bubbles. Further, if the lid 13 and the upper end of the enclosure portion 17 are connected without a gap, the coolant is unlikely to leak out of the enclosure portion 17 even in a bubble state. In addition, since the drainage pipe 16 is arranged inside the enclosure 17, when the liquid level exceeds the upper end of the drainage pipe 16, the cooling liquid and the bubbles flow out through the drainage pipe 16. As described above, the liquid storage device 1 prevents the coolant from overflowing from the second tank 12. The coolant that has flowed out of the drain pipe 16 is stored in the first tank 11 and used again by the machine tool 2.

  As described above in detail, in the present embodiment, the liquid storage device 1 includes the enclosure 17 inside the second tank 12, so that the coolant that rebounds from the liquid level or bubbles stays inside the enclosure 17. It is difficult to leak to the outside of the enclosure 17. Further, the generated bubbles remain inside the enclosure 17, and the cooling liquid is difficult to leak out of the enclosure 17 even in the state of bubbles. It is more difficult for the coolant that has leaked to the outside of the enclosure 17 to leak from the gap between the side wall of the second tank 12 and the lid 13. Therefore, the liquid storage device 1 prevents the coolant from leaking out from the second tank 12. Further, the length of the boundary between the lid 13 and the decompression tank 14 and the length of the boundary between the lid 13 and the upper end of the enclosure 17 are larger than the length of the boundary between the side wall of the second tank 12 and the lid 13. short. Accordingly, by closing the gap between the lid 13 and the decompression tank 14 and the gap between the lid 13 and the upper end of the enclosure portion 17, the liquid storage can be performed as compared with closing the gap between the side wall of the second tank 12 and the lid 13. The device 1 can more easily and reliably prevent the leakage of the coolant.

(Embodiment 2)
FIG. 6 is a schematic cross-sectional view of a part of the liquid storage device 1 according to the second embodiment. The upper part of the drainage pipe 16A has a shape in which the diameter continuously expands toward the upper end. That is, the opening area of the upper part of the drainage pipe 16A increases toward the upper end. The configuration of other parts of the liquid storage device 1 is the same as that of the first embodiment. Since the upper end of the drainage pipe 16A is widened, when the liquid level of the cooling liquid exceeds the upper end of the drainage pipe 16A, the cooling liquid and bubbles flow into the drainage pipe 16A from the upper end and flow out. easy. For this reason, the liquid storage device 1 more reliably prevents the coolant from overflowing from the second tank 12.

(Embodiment 3)
FIG. 7 is a schematic cross-sectional view of a part of the liquid storage device 1 according to the third embodiment. Bubbles generated inside the enclosure 17A may be pushed by the cooling liquid flowing in from the supply port 141 and sink below the liquid level. When the bubbles sink below the lower end of the enclosure 17A and move to the outside of the enclosure 17A, the bubbles stay on the liquid surface outside the enclosure 17A. When bubbles staying outside the enclosure 17A increase, the coolant may leak out in the form of bubbles from the gap between the side wall of the second tank 12 and the lid 13.

  In the present embodiment, the liquid storage device 1 is located at a position lower than the upper end of the drainage pipe 16B and protrudes laterally from the inner surface of the enclosure 17A, and at a position higher than the lower end of the enclosure 17A. And a second rib 32 protruding laterally from the outer surface of the drainage pipe 16B. The first rib 31 and the second rib 32 each have a surface that intersects the vertical direction. For example, the first rib 31 is formed along the inner surface of the enclosing portion 17A in parallel with a plane intersecting the vertical direction. Although the first rib 31 is not in contact with the outer surface of the drainage pipe 16B, it protrudes to a position close to the outer surface of the drainage pipe 16B. Further, for example, the second rib 32 is along the outer surface so as to go around the drain pipe 16B. Although the second rib 32 is not in contact with the inner surface of the enclosure portion 17A, the second rib 32 protrudes to a position close to the inner surface of the enclosure portion 17A.

  The 1st rib 31 and the 2nd rib 32 exist in the position of a different height. It is desirable that the first rib 31 is located higher than the second rib 32. When the 1st rib 31 exists in a position higher than the 2nd rib 32, it becomes possible to assemble the liquid storage apparatus 1 by covering 17 A of enclosure parts from the drainage pipe 16B. Further, it is desirable that the first rib 31 exists immediately below the supply port 141. When the first rib 31 exists directly below the supply port 141, when the liquid level is at a position below the first rib 31, the coolant flowing from the supply port 141 hits the first rib 31 and bubbles are not easily generated. . The configuration of other parts of the liquid storage device 1 is the same as that of the first embodiment.

  When the bubble generated inside the enclosure 17A sinks below the liquid level, the bubble collides with the first rib 31 or the second rib 32, and it is difficult to sink below. For this reason, it is difficult for the bubbles to sink below the lower end of the surrounding portion 17A and move to the outside of the surrounding portion 17A. In FIG. 7, the movement of the bubbles is indicated by broken-line arrows. It is desirable that a part of the first rib 31 and the second rib 32 overlap each other when viewed in the vertical direction. In this case, both the first rib 31 and the second rib 32 prevent the sinking of the bubbles, and it becomes more difficult for the bubbles to move to the outside of the enclosure 17A. Therefore, in the present embodiment, the liquid storage device 1 suppresses bubbles from staying outside the enclosure 17A, and the coolant leaks out in a bubble state from the gap between the side wall of the second tank 12 and the lid 13. To prevent it more reliably.

  In addition, each of the 1st rib 31 and the 2nd rib 32 may exist in multiple places. In addition, the liquid storage device 1 may include only one of the first rib 31 and the second rib 32.

(Embodiment 4)
FIG. 8 is a schematic cross-sectional view of a part of the liquid storage device 1 according to the fourth embodiment. In the present embodiment, the liquid storage device 1 includes a cylindrical body 33 between the drainage pipe 16 and the enclosure 17. The cylindrical body 33 has a cylindrical shape with an open upper end, is located in the second tank 12, and is vertically oriented. The inner diameter of the cylindrical body 33 is larger than the outer diameter of the drainage pipe 16 and smaller than the inner diameter of the enclosure portion 17. The cylindrical body 33 is in a position surrounding a part of the drainage pipe 16 from the lateral direction. The upper end of the cylindrical body 33 is located inside the enclosure 17 and is lower than the upper end of the drainage pipe 16 and higher than the lower end of the enclosure 17. That is, the upper end of the cylindrical body 33 is located inside the enclosure 17. The lower end of the cylindrical body 33 is connected to the bottom of the second tank 12. The configuration of other parts of the liquid storage device 1 is the same as that of the first embodiment.

  When bubbles generated inside the enclosure 17 sink below the liquid level, some of the sinked bubbles enter the cylindrical body 33 from the upper end of the cylindrical body 33. Since the foam that has entered the inside of the cylindrical body 33 cannot move outside the cylindrical body 33, it cannot move outside the enclosure 17. In FIG. 8, the movement of the bubbles is indicated by broken-line arrows. Since some of the bubbles that sink below the liquid level cannot move outside the enclosure 17, the sinking bubbles are less likely to move outside the enclosure 17. Accordingly, also in the present embodiment, the liquid storage device 1 suppresses bubbles from staying outside the enclosure 17 and the coolant leaks out from the gap between the side wall of the second tank 12 and the lid 13 in the form of bubbles. To prevent it more reliably.

(Embodiment 5)
FIG. 9 is a schematic cross-sectional view of a part of the liquid storage device 1 according to the fifth embodiment. In the present embodiment, the liquid storage device 1 includes a cylindrical body 34 between the drainage pipe 16 and the enclosure 17. The cylindrical body 34 has a bottomed cylindrical shape with an upper end opened with the vertical direction as an axial direction. The cylindrical body 34 is vertically oriented, and the drainage pipe 16 passes through the bottom 35 of the cylindrical body 34. The inner diameter of the cylindrical body 34 is larger than the outer diameter of the drainage pipe 16 and smaller than the inner diameter of the enclosure portion 17. The cylindrical body 34 is in a position surrounding a part of the drainage pipe 16 from the lateral direction. The upper end of the cylindrical body 34 is located inside the enclosure 17 and is lower than the upper end of the drainage pipe 16 and higher than the lower end of the enclosure 17. Further, the bottom portion 35 protrudes radially outward from the outer surface of the drainage pipe 16. The bottom 35 is closed at the lower end of the cylindrical body 34. The configuration of other parts of the liquid storage device 1 is the same as that of the first embodiment.

  When the foam generated inside the enclosure 17 sinks below the liquid level, a part of the sinked foam enters the cylindrical body 34 from the upper end of the cylindrical body 34. Bubbles that enter the inside of the cylindrical body 34 collide with the bottom 35 and cannot sink further downward, and cannot move outward from the cylindrical body 34. For this reason, the foam which entered the inside of the cylindrical body 34 cannot move to the outside of the enclosure part 17. In FIG. 9, the movement of the bubbles is indicated by broken line arrows. Since some of the bubbles that sink below the liquid level cannot move outside the enclosure 17, the sinking bubbles are less likely to move outside the enclosure 17. Accordingly, also in the present embodiment, the liquid storage device 1 suppresses bubbles from staying outside the enclosure 17 and the coolant leaks out from the gap between the side wall of the second tank 12 and the lid 13 in the form of bubbles. To prevent it more reliably.

  In the above first to fifth embodiments, the drainage pipe 16 has been shown penetrating the lower surface of the second tank 12 and the upper surface of the first tank 11, but the liquid storage device 1 is a bottom portion of the second tank 12. The lower end of the drainage pipe 16 may be connected to the opening. Even in this embodiment, when too much cooling liquid is supplied to the second tank 12, the cooling liquid flows out through the drainage pipe 16. In the first to fifth embodiments, the first tank 11 is provided below the second tank 12, but the liquid storage device 1 does not have the first tank 11 below the second tank 12. Form may be sufficient. Even in a form without the first tank 11, the coolant flows out from the second tank 12 through the drain pipe 16. In the first to fifth embodiments, the cooling liquid supply path includes the decompression tank 14. However, the liquid storage apparatus 1 does not include the decompression tank 14 in the cooling liquid supply path. May be. Further, the shapes of the drainage pipes 16, 16A, 16B, the enclosures 17, 17A, and the cylindrical bodies 33, 34 may be cylindrical, and are not limited to cylindrical. For example, the drainage pipes 16, 16 </ b> A, 16 </ b> B, the enclosures 17, 17 </ b> A, and the cylindrical bodies 33, 34 may be square cylinders.

1 Liquid storage device 11 First tank (drainage tank)
12 Second tank (storage tank)
13 Lid 14 Pressure reducing tank 141 Supply port 15 Supply pipe 16, 16A, 16B Drain pipe 17, 17A Enclosure 2 Machine tool 31 First rib 32 Second rib 33, 34 Tubular body 35 Bottom

Claims (7)

A storage tank for storing the coolant before being used in a machine tool, a lid for closing the upper side of the storage tank, a supply path for the coolant passing through the cover, and the storage of the coolant through the supply path In a liquid storage device comprising a supply port for feeding into a tank,
Both ends have a cylindrical shape, are arranged vertically in the storage tank, the upper end is in a position not facing the supply port, the lower end is in a position below the bottom of the storage tank, and flows from the upper end A drainage pipe for discharging the cooling liquid to the outside of the storage tank through the bottom of the storage tank;
The lower end is an open cylindrical shape, and is arranged vertically in the storage tank, surrounds the upper end of the drainage pipe and the supply port, and the upper end is connected to the lower surface of the lid, A liquid storage device comprising: an enclosure having a lower end lower than an upper end of the drainage pipe and higher than a bottom of the storage tank. A drainage tank for storing a coolant after being used in the machine tool;
The drainage tank is disposed below the storage tank,
The drainage pipe passes through the bottom of the storage tank,
The liquid storage device according to claim 1, wherein a lower end of the drainage pipe is located in the drainage tank. The supply path includes a decompression tank that decelerates the flow of the coolant,
The decompression tank is disposed through the lid,
The supply port is provided on the lower surface of the decompression tank,
The liquid storage device according to claim 1, wherein the enclosure part encloses a lower surface of the decompression tank. The liquid storage device according to any one of claims 1 to 3, wherein an upper portion of the drainage pipe has a shape in which an opening area continuously increases toward an upper end. A rib that protrudes from the inner surface of the enclosure at a position lower than the upper end of the drainage pipe and has a surface intersecting in the vertical direction, or protrudes from the outer surface of the drainage pipe at a position higher than the lower end of the enclosure. The liquid storage device according to any one of claims 1 to 4, further comprising a rib having a surface intersecting in the vertical direction. The upper end has an open cylindrical shape, is arranged vertically in the storage tank, surrounds a part of the drainage pipe, and the upper end is inside the enclosure from the upper end of the drainage pipe. The tubular body according to any one of claims 1 to 5, further comprising a cylindrical body that is lower and higher than a lower end of the enclosure, and the lower end is connected to the bottom of the storage tank. Liquid storage device. The upper end has an open cylindrical shape, is arranged vertically in the storage tank, surrounds a part of the drainage pipe, and the upper end is inside the enclosure from the upper end of the drainage pipe. 6. The tubular body according to claim 1, further comprising a cylindrical body that is lower and higher than the lower end of the enclosure, and whose lower end is blocked by a bottom portion protruding from the outer surface of the drainage pipe. The liquid storage device according to claim 1.

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