Oil separation device for cutting fluid

Abstract

To provide an oil separation device capable of improving the oil recovery efficiency while reducing running costs compared to the prior art.SOLUTION: An oil separation device 10 can separate oil from a cutting fluid L containing a predetermined amount of oil. The device comprises: an oil-repellent filter 11 formed of an oil-repellent material; a cutting fluid supply passage 12 allowing the supply of the cutting fluid L to the oil-repellent filter 11; and a cutting fluid discharge passage 13 allowing the discharge of a cutting fluid L' that has passed through the oil-repellent filter 11.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to an oil separation device for cutting fluid.

Background Art

[0002] Generally, when performing machining, a cutting fluid called coolant is used for purposes such as lubrication and cooling. Also, when recovering and reusing this cutting fluid, an oil separation device called an oil skimmer is arranged on the recovery path to remove unnecessary oil such as oily lubricating oil mixed in the coolant and solids such as sludge from the coolant.

[0003] Here, as the oil separation device used, a belt-type oil separation device is common. That is, in this type of oil separation device, one roller is arranged in the liquid to be separated, and the other roller is arranged at a position above the liquid, and by circulating a belt wound around these two or more rollers, the oil in the liquid adheres to the surface of the belt immersed in the liquid and is lifted above the liquid. Also, a scraping portion called a scraper is provided near the surface of the belt located above the liquid, and it is configured to remove foreign substances such as oil adhering to the belt surface (for example, refer to Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] On the other hand, in the case of a belt-type oil separation device, due to its structure, regular tension adjustment of the belt is required, resulting in high maintenance costs. In addition, not only oil but also sludge adheres to the belt and is recovered, so that the sludge and the belt rub against each other on the scraper, and the belt may break. Therefore, even in the case of a relatively inexpensive belt-type oil separation device, there is a problem that the total running costs, such as belt replacement costs and maintenance costs, increase. Moreover, in the case of the conventional oil separation device, since there is a limit to the recovery amount, depending on the equipment, the amount of oil and sludge generated may exceed the recovery amount of the oil separation device, and there is a risk that the coolant will deteriorate.

[0006] In view of the above circumstances, the technical problem to be solved in this specification is to provide an oil separation device that can increase the oil separation efficiency while keeping the running cost lower than the conventional one.

Means for Solving the Problem

[0007] The solution to the above problem is achieved by the oil separation device for cutting fluid according to the present invention. That is, this separation device is an oil separation device for cutting fluid capable of separating oil from cutting fluid containing a predetermined amount of oil, and is characterized by including an oil-repellent filter formed of an oil-repellent material, a cutting fluid supply path capable of supplying cutting fluid to the oil-repellent filter, and a cutting fluid discharge path capable of discharging the cutting fluid that has passed through the oil-repellent filter. Here, the oil-repellent filter formed of the oil-repellent material includes not only the one formed entirely of the oil-repellent material but also the one formed of the oil-repellent material at least on the surface portion in contact with the cutting fluid of the filter.

[0008] As a result of trying various materials and structures of filters for oil separation of cutting fluid and conducting intensive studies, the inventor of the present invention has found that when a filter formed of an oil-repellent material is used, the oil recovery efficiency is extremely high. That is, when cutting fluid is passed through a filter formed of an oil-repellent material, a large number of bubbles are generated by the collision of the cutting fluid with the filter, or a large number of fine bubbles are generated in the cutting fluid. Further, since the oil-repellent filter exhibits the property of repelling the oil in the cutting fluid, it has been found that the oil in the cutting fluid easily floats up together with the bubbles without adhering to the filter, and similarly, the sludge in the cutting fluid also easily floats up together with a large number of bubbles.

[0009] The present invention has been made based on the above findings. According to the oil separation device of the present invention, by supplying the cutting fluid toward the oil-repellent filter, bubbles are generated in the process of the cutting fluid passing through the oil-repellent filter, and the oil and sludge in the cutting fluid float up together with the generated bubbles. Therefore, it becomes possible to efficiently recover the oil and sludge in the cutting fluid above the oil-repellent filter. Further, since it is difficult for oil and sludge to adhere to an oil-repellent filter, the possibility that the portion of the filter through which the cutting fluid passes is clogged with oil and sludge is low, and the frequency of removing these oil and sludge from the filter surface can be reduced. Therefore, the labor and cost required for maintenance can be reduced. Of course, in the case of the oil separation device according to the present invention, since there is no driving part such as a belt, the labor and cost required for maintenance can also be reduced thereby.

[0010] Further, in the oil separation device according to the present invention, the oil-repellent filter may have a structure in which a plurality of resin plates formed of an oil-repellent resin as an oil-repellent material and provided with a large number of through holes are stacked.

[0011] Thus, by forming the oil-repellent filter into a structure in which a plurality of resin plates formed of an oil-repellent resin and provided with a large number of through holes are stacked, the contact area with the cutting fluid can be increased. Therefore, it becomes possible to generate more bubbles and further improve the recovery efficiency of oil components and the like. Further, by stacking a plurality of resin plates to form the oil-repellent filter, even if oil components or sludge adhere to the surface of the central portion (through holes) of the filter, it is possible to easily remove the oil components and sludge on the surface of the through holes.

[0012] Further, in the oil separation device according to the present invention, the oil-repellent material may be polyethylene.

[0013] As a result of the present inventor's intensive study on various materials that can be used as the oil-repellent filter, it has been found that polyethylene is inexpensive and exhibits excellent oil-repellent properties. It has also been found that when the cutting fluid is sprayed, it has the property of easily generating bubbles. From the above, by forming the oil-repellent filter from polyethylene, it becomes possible to more easily generate bubbles and further improve the recovery efficiency of oil components and the like. Further, since polyethylene is very inexpensive, even when the entire oil-repellent filter is formed of polyethylene, which is an oil-repellent resin, it is possible to manufacture the oil-repellent filter at low cost.

[0014] Further, the oil separation device according to the present invention may further include a storage tank for the cutting fluid disposed on the upstream side of the cutting fluid supply path, a suction port for the cutting fluid connected to the upstream end of the cutting fluid supply path and disposed at a position capable of sucking the cutting fluid stored in the storage tank, and a pump capable of sucking the cutting fluid in the storage tank and pumping it to the oil-repellent filter.

[0015] Since the oil separation device according to the present invention has improved oil separation efficiency (oil recovery efficiency) at each stage compared to a conventional oil separation device such as a belt-type oil skimmer, even when configured to actively supply a large amount of cutting fluid to the oil-repellent filter by a pump, it is possible to separate and recover oil components and the like without leakage from the supplied cutting fluid.

[0016] Further, when the oil separation device according to the present invention is provided with a suction port capable of sucking the cutting fluid in the storage tank as described above, the suction port may be connected to the upstream end of the cutting fluid supply path so as to be vertically movable, and a floating body floating on the cutting fluid may be attached to the suction port.

[0017] By configuring the suction port to be floating in this way, even when the amount of cutting fluid in the storage tank increases or decreases and the liquid level height fluctuates greatly, the height position of the suction port is automatically adjusted along with the fluctuation of the liquid level. Therefore, the suction port can always be arranged at an appropriate height position, and a stable supply of cutting fluid to the oil-repellent filter becomes possible.

[0018] Further, when a floating body is attached to the suction port as described above, in the oil separation device according to the present invention, the suction port is provided with three or more slits through which cutting fluid can flow in from three or more different directions, thereby generating a swirling flow in the cutting fluid flowing into the suction port.

[0019] By configuring the suction port to be floating in this way and providing three or more slits to generate a swirling flow in the cutting fluid flowing into the suction port, air near the suction port can be entrained and the cutting fluid can be sucked. As a result, the cutting fluid containing more air can be supplied to the oil-repellent filter, and the amount of bubbles generated when passing through the filter can be significantly increased, so that the oil recovery efficiency can be further enhanced.

[0020] The oil separation device according to the present invention further includes a filter housing tank capable of housing the oil-repellent filter. The filter housing tank has a filter placement chamber on which the oil-repellent filter is placed and a cutting fluid supply chamber partitioned from the filter placement chamber by a partition extending in the vertical direction and supplied with cutting fluid from the cutting fluid supply path. The filter placement chamber and the cutting fluid supply chamber may communicate with each other at a position below the partition.

[0021] By partitioning the filter placement chamber and the cutting fluid supply chamber with a partition extending in the vertical direction and connecting the two chambers at a position below the partition, the cutting fluid supplied to the cutting fluid supply chamber flows downward along the partition. After colliding with the bottom surface of the cutting fluid supply chamber, it flows into the oil-repellent filter (filter placement chamber) through the communication passage. Since a large amount of bubbles can be generated by this collision, the recovery efficiency of oil and sludge can be further improved by these large amounts of bubbles flowing into the filter placement chamber together with the cutting fluid.

Effect of the Invention

[0022] As described above, according to the oil separation device of the present invention, it is possible to increase the recovery efficiency of oil and sludge while keeping the running cost lower than before.

Brief Description of the Drawings

[0023]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Mode for Carrying Out the Invention

[0024] Hereinafter, the content of the oil separation device according to an embodiment of the present invention will be described based on the drawings.

[0025] Figure 1 shows the overall configuration of an oil separation device 10 according to an embodiment of the present invention. This oil separation device 10 is capable of separating oil from a predetermined cutting fluid L, and includes an oil-repellent filter 11, a cutting fluid supply path 12, and a cutting fluid discharge path 13. In the present embodiment, the oil separation device 10 further includes a storage tank 14 for the cutting fluid L, a suction port 15, a suction pump 16, and an oil discharge pump 17. In the present embodiment, a case where the oily lubricating oil and sludge as oil are separated and removed from the cutting fluid L will be described as an example.

[0026] The oil-repellent filter 11 is formed of an oil-repellent material and has a passage 11a for the cutting fluid L inside. In the present embodiment, the oil-repellent filter 11 has a structure in which a plurality of resin plates 18 formed of an oil-repellent resin as the oil-repellent material are stacked in the plate thickness direction. In this case, a large number of through holes 18a penetrating in the plate thickness direction are formed in each resin plate 18 (see FIG. 2), and by stacking the resin plates 18 provided with these large number of through holes 18a, the passage 11a for the cutting fluid L is configured (the portion indicated by the broken line in FIG. 1). In the present embodiment, each resin plate 18 has a constant thickness and a rectangular shape. In addition, substantially rectangular through holes 18a are arranged in a lattice pattern in each resin plate 18 (see FIG. 2). Therefore, in a state where a plurality of resin plates 18 are stacked, all the through holes 18a of each resin plate 18 are connected in the thickness direction.

[0027] The oil-repellent resin that can be used for the resin plate 18 is arbitrary as long as it can exhibit oil repellency, and polyethylene is preferable from the viewpoints of oil repellency and cost.

[0028] The oil-repellent filter 11 configured as described above is housed in the filter housing tank 19. Here, the filter housing tank 19 is partitioned into a filter installation chamber 19a in which the oil-repellent filter 11 is installed by a first partition 20 extending in the vertical direction, and a cutting fluid supply chamber 19b to which the cutting fluid is supplied from the cutting fluid supply path 12. Further, in the present embodiment, the filter installation chamber 19a and a cutting fluid discharge chamber 19c in which the cutting fluid L' subjected to oil separation treatment by the oil-repellent filter 11 is stored and discharged are partitioned by a second partition 21 extending in the vertical direction.

[0029] In the present embodiment, the filter installation chamber 19a and the cutting fluid supply chamber 19b communicate with each other at a position below the first partition 20. Further, in the present embodiment, a large number of openings (not shown) communicating with the through holes 18a are provided on the side surface 18b of each resin plate 18. Therefore, even when the oil-repellent filter 11 is installed without a gap between the partitions 20 and 21 and on the bottom surface 19a1 of the filter installation chamber 19a as shown in the figure, the cutting fluid L can flow into the passage 11a (through hole 18a).

[0030] Also, the filter installation chamber 19a and the cutting fluid discharge chamber 19c communicate with each other at a position below the second partition 21. The upstream end opening of the cutting fluid discharge path 13 is disposed in the region of the cutting fluid discharge chamber 19c where the cutting fluid L' is stored. Thereby, the treated cutting fluid L' flowing into the cutting fluid discharge chamber 19c can be discharged outside the filter housing tank 19 (for example, a clean tank).

[0031] The suction pump 16 is disposed on the cutting fluid supply path 12 and is configured to be able to suck the cutting fluid L stored in the storage tank 14 through the suction port 15 disposed in the storage tank 14 and pump it toward the oil-repellent filter 11.

[0032] The suction port 15 is disposed at a position where the cutting fluid L stored in the storage tank 14 can be sucked. In the present embodiment, the suction port 15 is formed to open upward. Further, in this case, the suction port 15 is connected to the upstream end 12a of the cutting fluid supply path 12 disposed in the storage tank 14 so as to be vertically movable, and one or a plurality of floating bodies 22 floating on the cutting fluid L are attached to the suction port 15.

[0033] Here, the connection form between the suction port 15 and the cutting fluid supply path 12 is arbitrary. For example, when the cutting fluid supply path 12 is formed of a tubular member and the suction port 15 is formed of a cylindrical member, the suction port 15 and the upstream end 12a of the cutting fluid supply path 12 are fitted so as to be vertically movable (see FIG. 4).

[0034] The number of the floating bodies 22 is arbitrary, but in view of being attached around the upward-facing suction port 15 as in the illustrated example and the posture of the suction port 15 being stabilized, it is desirable that three or more floating bodies 22 be attached.

[0035] Further, in the present embodiment, while the floating body 22 is attached to the suction port 15, three or more slits 23 through which the cutting fluid L can flow in from three or more different directions are provided in the suction port 15 (see FIGS. 3 and 4). In this case, it is desirable to configure the cutting fluid L flowing into the suction port 15 through these three or more slits 23 to generate a swirling flow in the flowing cutting fluid L.

[0036] From the above viewpoints, in the present embodiment, at least the upper portion of the suction port 15 is formed in a triangular cylinder shape (see FIG. 4), and the floating body 22 and the slit 23 are provided one by one on the three side wall portions 15a forming the triangular cylinder shape.

[0037] Above the oil-repellent filter 11, the upstream end opening of the oil discharge path 24 is disposed, and an oil discharge pump 17 is provided in the oil discharge path 24. Thereby, the oil separated (floated) by passing through the oil-repellent filter 11 can be sucked by the driving force of the oil discharge pump 17 and discharged from above the oil-repellent filter 11.

[0038] Next, an example of the usage mode of the oil separation device 10 with the above configuration will be mainly described with reference to FIG. 5.

[0039] First, the suction pump 16 is driven to suck the cutting fluid L stored in the storage tank 14 into the cutting fluid supply passage 12, and the sucked cutting fluid L is pumped toward the filter housing tank 19 in which the oil-repellent filter 11 is housed. Here, since the suction port 15 is always held at the liquid level height of the cutting fluid L in the storage tank 14 by the floating body 22, the air (atmosphere) near the liquid level together with the cutting fluid L near the liquid level is sucked into the cutting fluid supply passage 12 through the suction port 15 by the suction action of the suction pump 16 and sent to the filter housing tank 19.

[0040] Also, in the present embodiment, three or more slits 23 through which the cutting fluid L can flow into the suction port 15 from three or more different directions are provided at the suction port 15, and the cutting fluid L flows into the suction port 15 through these three or more slits 23, so that a swirling flow is generated in the flowing cutting fluid L. Therefore, when the cutting fluid L near the liquid level is sucked while generating a swirling flow through each slit 23, the atmosphere near the liquid level is entrained and sucked together with the cutting fluid L. As a result, the cutting fluid L containing a large amount of air is sent toward the filter housing tank 19.

[0041] The cutting fluid L supplied from the cutting fluid supply passage 12 to the filter housing tank 19 first flows into the cutting fluid supply chamber 19b, and then flows into the filter installation chamber 19a. Here, since the filter installation chamber 19a and the cutting fluid supply chamber 19b are partitioned by the first partition 20 extending in the vertical direction, the cutting fluid L flowing into the cutting fluid supply chamber 19b flows downward along the first partition 20, collides with the bottom surface 19b1 of the cutting fluid supply chamber 19b, and then flows into the filter installation chamber 19a in which the oil-repellent filter 11 is installed through the communication passage located below the first partition 20.

[0042] The cutting fluid L flowing into the filter installation chamber 19a enters the passage 11a of the oil-repellent filter 11 through the opening of the side surface 18b (not shown) or the gap between the resin plates 18. Then, in the process of passing through the oil-repellent filter 11 along the passage 11a, air bubbles B are generated. The oil content or sludge in the cutting fluid L floats up together with the air bubbles B without adhering to the surface of the oil-repellent filter 11 (the surface of the passage 11a) which exhibits oil repellency. In this way, the oil content and sludge are separated from the cutting fluid L that has passed through the oil-repellent filter 11 and float near the liquid surface of the cutting fluid L located above the oil-repellent filter 11. The floated oil content and the like are sucked into the oil discharge passage 24 through the upstream end opening of the oil discharge passage 24 installed at the liquid level height by driving the oil discharge pump 17 and discharged outside the filter housing tank 19.

[0043] The cutting fluid L (i.e., the treated cutting fluid L') from which the oil separation is completed flows into the cutting fluid discharge chamber 19c through the communication passage located below the second partition 21 or through the communication portion (not shown) opened at a position lower than the liquid level provided in the second partition 21. The treated cutting fluid L' flowing into the cutting fluid discharge chamber 19c is discharged outside the filter housing tank 19 (such as a clean tank) through the upstream end opening of the cutting fluid discharge passage 13 installed at a predetermined height position in the cutting fluid discharge chamber 19c. In the above manner, the oil separation treatment for the cutting fluid L is continuously performed.

[0044] As described above, according to the oil separation device 10 according to the present embodiment, bubbles B are generated in the process of the cutting fluid L passing through the oil-repellent filter 11, and the oil and sludge in the cutting fluid L float up together with the generated bubbles B. Therefore, it is possible to efficiently recover the oil and sludge in the cutting fluid L above the oil-repellent filter 11. Further, since it is difficult for oil and sludge to adhere to the oil-repellent filter 11, the portion (passage 11a) of the oil-repellent filter 11 through which the cutting fluid L passes is less likely to be clogged with oil and sludge, and the frequency of removing these oil and sludge from the surface of the oil-repellent filter 11 can be reduced. Therefore, the labor and cost required for maintenance can be reduced. Of course, in the oil separation device 10 according to the present embodiment, since there is no driving part such as a belt, the labor and cost required for maintenance can also be reduced by this.

[0045] Further, in the present embodiment, a suction port 15 capable of sucking the cutting fluid L is provided in the storage tank 14, the suction port 15 is connected to the upstream end 12a of the cutting fluid supply path 12 so as to be vertically movable, and a floating body 22 floating on the cutting fluid L is attached to the suction port 15. By configuring the suction port 15 to be floating in this way, even when the cutting fluid L in the storage tank 14 increases or decreases and the liquid level height fluctuates greatly, the height position of the suction port 15 is automatically adjusted along with the fluctuation of the liquid level. Therefore, the suction port 15 can always be arranged at an appropriate height position, and a stable supply of the cutting fluid to the oil-repellent filter 11 becomes possible.

[0046] Furthermore, in the present embodiment, three or more slits 23 through which the cutting fluid L can flow in from three or more different directions are provided in the suction port 15, so that a swirling flow is generated in the cutting fluid L flowing into the suction port 15. Therefore, the air near the suction port 15 can be involved and the cutting fluid L can be sucked in. As a result, the cutting fluid L containing more air can be supplied to the oil-repellent filter 11, and the amount of bubbles B generated when passing through the oil-repellent filter 11 can be significantly increased. Therefore, it is possible to further enhance the recovery efficiency of oil and sludge.

[0047] Further, in the present embodiment, a filter housing tank 19 capable of housing the oil-repellent filter 11 is provided. The filter housing tank 19 is partitioned by a first partition 20 extending in the vertical direction into a filter installation chamber 19a where the oil-repellent filter is installed and a cutting fluid supply chamber 19b to which the cutting fluid L is supplied from the cutting fluid supply path 12. The filter installation chamber 19a and the cutting fluid supply chamber 19b are communicated with each other at a position below the first partition 20. By partitioning the filter installation chamber 19a and the cutting fluid supply chamber 19b with the first partition 20 extending in the vertical direction and communicating the two chambers 19a and 19b at a position below the first partition 20, the cutting fluid L supplied to the cutting fluid supply chamber 19b flows downward along the extending direction of the first partition 20. After colliding with the bottom surface 19b1 of the cutting fluid supply chamber 19b, it flows into the oil-repellent filter 11 (filter installation chamber 19a) through the communication path. Since a large amount of bubbles can be generated by this collision, the recovery efficiency of oil and sludge can be further enhanced as these large amounts of bubbles flow into the filter installation chamber 19a together with the cutting fluid L.

[0048] As described above, one embodiment of the present invention has been described. However, the oil separation device according to the present invention can adopt configurations other than the above as long as it does not deviate from the gist of the present invention.

[0049] For example, in the above embodiment, regarding the form of the oil-repellent filter 11, a case where a plurality of passages 11a extending in the vertical direction with rectangular through-holes 18a arranged in a grid pattern in the thickness direction and all these passages 11a are formed in the same form and the same size (cross-sectional area) is illustrated. However, of course, it is not limited to this. For example, although not shown, the through-hole 18a may be circular, and the cross-sectional shape of the passage 11a may be circular, etc., that is, the cross-sectional shape of the passage 11a may be other than rectangular. Also, it is not necessary for the cross-sectional shapes and cross-sectional areas of all the passages 11a to be the same. For example, the cross-sectional area of the passage 11a may be increased toward the upstream side and decreased toward the downstream side.

[0050] Of course, it is not necessary to limit the oil-repellent filter 11 to a structure in which a plurality of resin plates 18 are stacked. For example, although not shown, it may have an integral shape in which a large number of through holes serving as passages 11a are formed in a lattice pattern on the entire surface.

[0051] Also, the installation mode of the oil-repellent filter 11 is not limited to the above-described embodiment. For example, although not shown, the oil-repellent filter 11 in the form shown in FIG. 1 may be installed at a position away from the bottom surface 19a1 of the filter installation chamber 19a upward.

[0052] In the above description, the cutting fluid L in which an oil-based lubricating oil and solids such as sludge are mixed is exemplified. However, it goes without saying that a cutting fluid having a composition other than the above can be the object of treatment (the object of oil separation) of the present invention as long as it contains a component recognized as an oil component.

Explanation of Reference Numerals

[0053] 10 Oil separation device 11 Oil-repellent filter 11a Passage 12 Cutting fluid supply path 12a Upstream end 13 Cutting fluid discharge path 14 Storage tank 15 Suction port 15a Side wall portion 16 Suction pump 17 Oil discharge pump 18 Resin plate 18a Through hole 18b Side surface 19 Filter housing tank 19a Filter installation chamber 19a1 Bottom surface 19b Cutting fluid supply chamber 19b1 Bottom surface 19c Cutting fluid discharge chamber 22 Floating body 23 Slit 24 Oil discharge path B Bubble L,L’ Cutting fluid

Claims

1. An oil separation device for a cutting fluid capable of separating oil from a cutting fluid containing a predetermined amount of oil, comprising: An oil-repellent filter formed of an oil-repellent material; A cutting fluid supply path capable of supplying the cutting fluid to the oil-repellent filter; An oil separation device for a cutting fluid, comprising a cutting fluid discharge path capable of discharging the cutting fluid that has passed through the oil-repellent filter.

2. The oil separation device according to claim 1, wherein the oil-repellent filter has a structure in which a plurality of resin plates formed of an oil-repellent resin as the oil-repellent material and provided with a plurality of through holes are stacked.

3. A storage tank for the cutting fluid disposed upstream of the cutting fluid supply path; A suction port for the cutting fluid connected to the upstream end of the cutting fluid supply path and disposed at a position capable of sucking the cutting fluid stored in the storage tank; The oil separation device according to claim 1, further comprising a pump capable of sucking the cutting fluid in the storage tank and pumping it to the oil-repellent filter.

4. The oil separation device according to claim 3, wherein the suction port is connected to the upstream end of the cutting fluid supply path so as to be vertically movable, and a floating body floating on the cutting fluid is attached to the suction port.

5. The oil separation device according to claim 4, wherein the suction port is provided with three or more slits through which the cutting fluid can flow from three or more different directions, thereby generating a swirling flow in the cutting fluid flowing into the suction port.

6. Further comprising a filter housing tank capable of housing the oil-repellent filter, The filter housing tank has a filter installation chamber in which the oil-repellent filter is installed, and a cutting fluid supply chamber partitioned from the filter installation chamber by a partition extending in the vertical direction and supplied with the cutting fluid from the cutting fluid supply path, The oil separation device according to claim 1, wherein the filter installation chamber and the cutting fluid supply chamber communicate with each other at a position below the partition.

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