Filter unit, liquid flow device, and liquid discharge device

Abstract

To provide a filter unit capable of improving discharge property of air bubbles, a liquid flow device, and a liquid discharge device.SOLUTION: A filter unit 28 attachable to / detachable from an upstream connection part 26 and a downstream connection part 27 includes a filter 30 for filtering liquid, a filter chamber 31 having a filter front chamber 35 and a filter rear chamber 36 partitioned by the filter 30, an introduction flow channel 32 for introducing the liquid into the filter front chamber 35 through an introduction port 42, and a first lead-out flow passage 33f for leading out the liquid from the filter rear chamber 36 through the first lead-out port 46f. In an attitude mounted on the upstream connection part 26 and the downstream connection part 27, the introduction port 42 is positioned on the lowermost part of the filter front chamber 35; the first lead-out port 46f is positioned on the uppermost part of the filter rear chamber 36; and a bottom surface 40 of the filter front chamber 35 is inclined upward from the position of the introduction port 42.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a filter unit, a liquid flow device, and a liquid ejection device. [Background technology]

[0002] For example, as disclosed in Patent Document 1, the filter unit includes a filter, a first ink chamber which is an example of a pre-filter chamber, and a second ink chamber which is an example of a post-filter chamber. Ink flows into the first ink chamber from an ink chamber inlet which is an example of an inlet. The ink chamber inlet is located above the first ink chamber. The ink that flows into the first ink chamber passes through the filter and flows into the second ink chamber. The ink in the second ink chamber flows out from an ink chamber outlet which is an example of an outlet into an ink outflow path. The ink outflow path extends downward from the second ink chamber. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-248058 Summary of the Invention [Problem to be solved by the invention]

[0004] In the filter unit of Patent Document 1, ink flows in from above, passes through the filter, and then flows out downwards. Therefore, when filling the filter unit with liquid, there is a risk that air bubbles will remain. [Means for solving the problem]

[0005] The filter unit that solves the above problem is a filter unit that is detachable from an upstream connection part and a downstream connection part, and comprises a filter that filters liquid, a filter chamber having a pre-filter chamber and a post-filter chamber partitioned by the filter, an inlet flow path that introduces liquid into the pre-filter chamber via an inlet, and an outlet flow path that discharges liquid from the post-filter chamber via an outlet, and when attached to the upstream connection part and the downstream connection part, the inlet is located at the bottom of the pre-filter chamber, the outlet is located at the top of the post-filter chamber, and the bottom surface of the pre-filter chamber is inclined upward from the position of the inlet.

[0006] A liquid flow device that solves the above problem comprises a filter unit having the above configuration, the upstream connection part, the downstream connection part, an upstream flow path connected to the upstream connection part, and a downstream flow path connected to the downstream connection part.

[0007] A liquid ejection device that solves the above problem includes a liquid flowing device having the above configuration and a liquid ejection section that can eject liquid. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic diagram of a first embodiment of a liquid ejection device. [Figure 2] FIG. 2 is a schematic cross-sectional view of a first embodiment of the filter unit. [Figure 3] FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. [Figure 4] FIG. 4 is a schematic cross-sectional view of a second embodiment of the filter unit. [Figure 5] FIG. 5 is a schematic cross-sectional view of a third embodiment of the filter unit. [Figure 6] FIG. 6 is a schematic cross-sectional view of a fourth embodiment of the filter unit. [Figure 7] FIG. 7 is a cross-sectional view taken along line 7-7 in FIG. [Figure 8]FIG. 8 is a schematic cross-sectional view of a fifth embodiment of the filter unit. [Figure 9] FIG. 9 is a schematic cross-sectional view of a sixth embodiment of the filter unit. [Figure 10] FIG. 10 is a schematic cross-sectional view of a sixth embodiment of the filter unit. DETAILED DESCRIPTION OF THE INVENTION

[0009] [First embodiment] A first embodiment of a filter unit, a liquid flow device, and a liquid ejection device will be described below with reference to the drawings. The liquid ejection device is, for example, an inkjet printer that prints by ejecting ink, which is an example of a liquid, onto a medium such as paper.

[0010] In the drawings, the liquid discharge unit 12 is placed on a horizontal plane, with the direction of gravity indicated by the Z axis, and directions along the horizontal plane indicated by the X and Y axes. The X, Y, and Z axes are perpendicular to one another. In the following description, the direction parallel to the Z axis is also referred to as the vertical direction Z.

[0011] <Liquid discharge device> 1, the liquid ejection device 11 includes a liquid ejection unit 12 and a liquid flow device 13. The liquid ejection device 11 may also include a mounting unit .

[0012] The liquid ejection unit 12 is capable of ejecting liquid. The liquid ejection unit 12 has one or more nozzles 16. The liquid ejection unit 12 ejects liquid from the nozzles 16 to print on a medium 17. A liquid supply source 19 that stores liquid is removably attached to the mounting portion 14. If the liquid supply source 19 is a tank that can be replenished with liquid, the liquid supply source 19 may be fixed to the mounting portion 14.

[0013] <Liquid flow device> The liquid flow device 13 supplies liquid to the liquid discharge part 12 from a liquid supply source 19 attached to the attachment part 14. The liquid flow device 13 may include a first one-way valve 21, a supply pump 22, and a second one-way valve 23. The liquid flow device 13 includes an upstream flow path 24, a downstream flow path 25, an upstream connection part 26, a downstream connection part 27, and a filter unit 28.

[0014] The first one-way valve 21, the supply pump 22, and the second one-way valve 23 may be provided in the upstream flow path 24. The first one-way valve 21 is provided upstream of the supply pump 22 in the supply direction D. The second one-way valve 23 is provided downstream of the supply pump 22 in the supply direction D. The first one-way valve 21 and the second one-way valve 23 allow the flow of liquid downstream in the supply direction D, and restrict the flow of liquid upstream.

[0015] The supply pump 22 is provided between the first one-way valve 21 and the second one-way valve 23. The supply pump 22 is, for example, a diaphragm pump. The supply pump 22 applies negative pressure to the liquid contained in the liquid supply source 19, thereby discharging the liquid to the upstream flow path 24. The supply pump 22 pressurizes the liquid discharged from the liquid supply source 19, thereby supplying the liquid to the liquid discharge unit 12.

[0016] The upstream flow path 24 is connected to the upstream connection part 26. The downstream end of the upstream flow path 24 is connected to the upstream connection part 26. The upstream end of the upstream flow path 24 may be provided in the mounting part 14. The upstream end of the upstream flow path 24 may be, for example, a hollow needle that is inserted into the liquid supply source 19. By connecting the upstream end of the upstream flow path 24 to the liquid supply source 19 mounted in the mounting part 14, the upstream flow path 24 becomes able to discharge the liquid contained in the liquid supply source 19.

[0017] The downstream flow path 25 is connected to the downstream connection part 27. The upstream end of the downstream flow path 25 is connected to the downstream connection part 27. The downstream end of the downstream flow path 25 is connected to the liquid discharge part 12. The upstream connection portion 26 may be located lower in the vertical direction Z than the downstream connection portion 27 .

[0018] <Filter unit> 2, the filter unit 28 is detachably attached to the upstream connection part 26 and the downstream connection part 27. In FIG. 2, the filter unit 28 is shown attached to the upstream connection part 26 and the downstream connection part 27.

[0019] The filter unit 28 includes a filter 30, a filter chamber 31, an inlet flow path 32, a first outlet flow path 33f which is an example of an outlet flow path, and a second outlet flow path 33s. The filter 30 filters the liquid. The filter 30 captures foreign matter contained in the liquid. The filter 30 may be a porous body, a nonwoven fabric, or the like. The filter 30 may be cylindrical.

[0020] The filter chamber 31 has a pre-filter chamber 35 and a post-filter chamber 36. The pre-filter chamber 35 and the post-filter chamber 36 are separated by the filter 30. The pre-filter chamber 35 may surround the outside of the filter 30 and the post-filter chamber 36. The pre-filter chamber 35 may have side surfaces 38, a top surface 39, and a bottom surface 40. The pre-filter chamber 35 may be located below the upper end of the filter 30. The pre-filter chamber 35 does not have a space above the filter 30.

[0021] Top surface 39 is located below the upper end of filter 30. Top surface 39 is a flat surface with the end in contact with filter 30 located at the highest position. Top surface 39 may be inclined upward from side surface 38 toward filter 30.

[0022] An inlet 42 may be provided on the side surface 38. The inlet 42 is located at the bottom of the filter front chamber 35. The lower end of the inlet 42 contacts the bottom surface 40. The bottom surface 40 slopes upward from the position of the inlet 42. The end of the bottom surface 40 on the inlet 42 side is located at the lowest position. The end of the bottom surface 40 opposite the inlet 42 is located at the highest position.

[0023] 2 and 3, the filter front chamber 35 may have a plurality of ribs 44. The plurality of ribs 44 are provided on the bottom surface 40. The ribs 44 may be arc-shaped. The distance between the ends of adjacent ribs 44 farther from the inlet 42 may be longer than the distance between the ends of adjacent ribs 44 closer to the inlet 42.

[0024] 2, the upstream end of introduction flow channel 32 is detachably connected to upstream connector 26. The downstream end of introduction flow channel 32 is connected to filter front chamber 35. Introduction flow channel 32 introduces liquid into filter front chamber 35 via introduction port 42.

[0025] The post-filter chamber 36 may be the space inside the filter 30. The post-filter chamber 36 may have a first outlet 46f, which is an example of an outlet, and a second outlet 46s. The first outlet 46f is located at the top of the post-filter chamber 36. The second outlet 46s is located at the bottom of the post-filter chamber 36.

[0026] The downstream end of the first outlet flow path 33f is detachably connected to the downstream connecting part 27. The upstream end of the first outlet flow path 33f is connected to the post-filter chamber 36. The first outlet flow path 33f discharges the liquid from the post-filter chamber 36 via the first outlet port 46f.

[0027] The downstream end of the second outlet flow path 33s is detachably connected to the downstream connecting part 27. The upstream end of the second outlet flow path 33s is connected to the post-filter chamber 36. The second outlet flow path 33s leads the liquid from the post-filter chamber 36 through the second outlet port 46s.

[0028] <Operation of the First Embodiment> The operation of this embodiment will be described. 2, when filling the filter unit 28 with liquid, the liquid is introduced into the pre-filter chamber 35 from the inlet channel 32. The liquid level rises along the inclined bottom surface 40. When the liquid level reaches the filter 30, the liquid passes through the filter 30 and flows into the post-filter chamber 36.

[0029] The upper end of the filter 30 is located above the pre-filter chamber 35. Therefore, before the pre-filter chamber 35 is filled with liquid, the air in the pre-filter chamber 35 comes into contact with the filter 30. As the liquid level in the pre-filter chamber 35 rises, the liquid pushes out the air in the pre-filter chamber 35. The air in the pre-filter chamber 35 passes through the filter 30 and moves to the post-filter chamber 36.

[0030] Before the post-filter chamber 36 is filled with liquid, the first outlet flow path 33f discharges the air inside the post-filter chamber 36. Once the post-filter chamber 36 is filled with liquid, the first outlet flow path 33f discharges the liquid.

[0031] When supplying liquid to the liquid discharger 12, the liquid is also introduced into the filter unit 28 from the introduction flow path 32. The liquid introduced into the filter front chamber 35 is rolled up along the bottom surface 40, and its flow is disturbed by the ribs 44. Therefore, the liquid in the filter front chamber 35 is agitated by the introduced liquid.

[0032] The liquid in the post-filter chamber 36 may be discharged from the first outlet flow path 33f and the second outlet flow path 33s. When sedimentation occurs in the post-filter chamber 36, a liquid with a low concentration is discharged from the first outlet flow path 33f, and a liquid with a high concentration is discharged from the second outlet flow path 33s. A mixture of a liquid with a low concentration and a liquid with a high concentration may be supplied to the liquid discharger 12.

[0033] <Effects of the first embodiment> The effects of this embodiment will be described. (1-1) When filling the filter unit 28 with liquid, air bubbles are likely to remain at the top. In this regard, the inlet 42 is located at the bottom of the pre-filter chamber 35. The liquid introduced into the pre-filter chamber 35 from the inlet 42 passes through the filter 30 and flows into the post-filter chamber 36 as the liquid level rises along the inclined bottom surface 40. The first outlet 46f is located at the top of the post-filter chamber 36. Because the filter unit 28 can be filled with liquid while air bubbles are being discharged from the first outlet 46f, the ability to discharge air bubbles can be improved.

[0034] (1-2) For example, if the filter front chamber 35 has a space above the filter 30, there is a risk that air bubbles will remain in this space. In this regard, the filter front chamber 35 is located below the upper end of the filter 30. Therefore, by eliminating the space where air is likely to remain, it is possible to reduce the amount of remaining air bubbles.

[0035] (1-3) The filter front chamber 35 has ribs 44 provided on the bottom surface 40. The ribs 44 interrupt the flow of liquid introduced into the filter front chamber 35. That is, the ribs 44 disrupt the flow of liquid, thereby agitating the liquid.

[0036] (1-4) The bottom surface 40 of the filter front chamber 35 is inclined upward from the position of the inlet 42. Therefore, the liquid that flows into the filter front chamber 35 from the inlet 42 is likely to flow from bottom to top near the inlet 42. Therefore, even when using a liquid that is likely to settle over time, the settled liquid can be stirred.

[0037] [Second embodiment] Next, a second embodiment of the filter unit will be described with reference to the drawings. In this embodiment, the same components as those in the above embodiment will be designated by the same reference numerals and redundant description will be omitted.

[0038] <Filter unit> FIG. 4 illustrates the filter unit 28 in an attached position to the upstream connection 26 and the downstream connection 27 .

[0039] As shown in FIG. 4, the filter unit 28 may include a filter 30, a pre-filter chamber 35, a post-filter chamber 36, an inlet flow channel 32, an outlet flow channel 33, and a rib 44.

[0040] The filter 30 may be conical in shape with its lower end in the vertical direction Z as its apex. The pre-filter chamber 35 may be located below the filter 30 and the post-filter chamber 36. The pre-filter chamber 35 may have a top surface 39, a bottom surface 40, and an inlet 42. The pre-filter chamber 35 is located below the upper end of the filter 30.

[0041] The inlet 42 may open to the bottom surface 40. The inlet 42 is located at the bottom of the filter front chamber 35. The inlet 42 may be located in the center of the bottom surface 40. The inlet 42 may be located directly below the apex of the filter 30.

[0042] The bottom surface 40 is inclined upward from the position of the inlet 42. The inlet 42 is located at the lowest position of the bottom surface 40. The further away from the inlet 42 the bottom surface 40 is, the higher the position becomes.

[0043] The inlet flow channel 32 introduces the liquid into the filter front chamber 35 via the inlet 42 . The post-filter chamber 36 has an outlet 46. The outlet 46 is located at the top of the post-filter chamber 36. The outlet flow path 33 discharges the liquid from the post-filter chamber 36 via the outlet 46.

[0044] <Operation of the Second Embodiment> The operation of this embodiment will be described. 4, when filling the filter unit with liquid, the liquid is introduced into the pre-filter chamber 35 from the introduction channel 32. The liquid passes through the filter 30 and flows into the post-filter chamber .

[0045] Before the post-filter chamber 36 is filled with liquid, the outlet flow path 33 discharges the air inside the post-filter chamber 36. When the post-filter chamber 36 is filled with liquid, the outlet flow path 33 discharges the liquid. The discharged liquid is sent to the liquid discharger 12 via the downstream connection part 27 and the downstream flow path 25.

[0046] <Effects of the second embodiment> The effects of this embodiment will be described. (2-1) The filter 30 is conical. Therefore, even if the filter unit 28 is tilted and filled with liquid, a portion of the filter 30 can remain above the liquid surface until the filter front chamber 35 is filled with liquid. This reduces the amount of air bubbles remaining in the filter front chamber 35.

[0047] [Third embodiment] Next, a third embodiment of the filter unit will be described with reference to the drawings. In this embodiment, the same components as those in the above embodiment will be designated by the same reference numerals and redundant description will be omitted.

[0048] <Filter unit> FIG. 5 illustrates the filter unit 28 in an attached position to the upstream connection 26 and the downstream connection 27 .

[0049] As shown in FIG. 5, the filter unit 28 may include a first filter 30f, which is an example of a filter, a pre-filter chamber 35, a post-filter chamber 36, an inlet flow path 32, a first outlet flow path 33f, a second outlet flow path 33s, a bypass flow path 48, and a second filter 30s.

[0050] The first filter 30f may be cylindrical and separates a pre-filter chamber 35 and a post-filter chamber 36. The top surface 39 may be located above the first filter 30f. A bypass port 49 may be provided in the top surface 39. The bypass port 49 is located at the top of the filter front chamber 35. The top surface 39 is inclined downward from the position of the bypass port 49.

[0051] The bypass flow path 48 connects the filter front chamber 35 and the first outlet flow path 33f. The upstream end of the bypass flow path 48 is connected to a bypass port 49. The downstream end of the bypass flow path 48 is connected to the first outlet flow path 33f. The bypass flow path 48 discharges the liquid from the filter front chamber 35 via the bypass port 49. A second filter 30s may be provided in the bypass flow path 48. The second filter 30s is located above the first filter 30f.

[0052] The diameter of the first outlet flow path 33f may be smaller than the diameter of the second outlet flow path 33s. The second outlet flow path 33s may connect the post-filter chamber 36 to the first outlet flow path 33f. The downstream end of the second outlet flow path 33s may be connected to the first outlet flow path 33f. The second outlet flow path 33s merges the liquid discharged from the post-filter chamber 36 with the first outlet flow path 33f.

[0053] <Operation of the Third Embodiment> The operation of this embodiment will be described. As shown in FIG. 5, when filling the filter unit 28 with liquid, the liquid is introduced into the filter front chamber 35 from the introduction channel 32. When the liquid comes into contact with the first filter 30f, the first filter 30f absorbs the liquid. If the first filter 30f has excellent absorbency, the first filter 30f may absorb the liquid faster than the liquid level in the filter front chamber 35 rises. If the first filter 30f becomes entirely wet before the filter front chamber 35 is filled with liquid, air cannot be discharged through the first filter 30f.

[0054] When the entire first filter 30f becomes wet, the air in the filter front chamber 35 is discharged through the bypass flow path 48. When the filter front chamber 35 is filled with liquid, the liquid flows into the bypass flow path 48. The liquid that flows into the bypass flow path 48 passes through the second filter 30s, the first outlet flow path 33f, the downstream connection portion 27, and the downstream flow path 25 and is sent to the liquid discharge unit 12.

[0055] <Effects of the third embodiment> The effects of this embodiment will be described. (3-1) For example, in the case of a first filter 30f with high wettability and strong capillary force, the rate at which the liquid absorbed by the first filter 30f rises may be faster than the rate at which the liquid level rises. Gas easily passes through a dry first filter 30f, but it is difficult to pass through a wet first filter 30f. Therefore, when a first filter 30f that easily gets wet is used, air bubbles are likely to remain in the filter front chamber 35. To address this issue, a bypass flow path 48 is connected to the top of the filter front chamber 35. The bypass flow path 48 can discharge air bubbles from the filter front chamber 35, thereby improving bubble discharge. The liquid flowing through the bypass flow path 48 passes through the second filter 30s and merges with the first outlet flow path 33f. Therefore, the liquid flowing through the bypass flow path 48 does not need to be discarded and can be reused.

[0056] (3-2) The liquid in the post-filter chamber 36 is discharged through the first outlet flow path 33f and the second outlet flow path 33s. The first outlet flow path 33f discharges the liquid from a first outlet 46f located at the top of the post-filter chamber 36. The second outlet flow path 33s discharges the liquid from a second outlet 46s located at the bottom of the post-filter chamber 36. The second outlet flow path 33s merges with the first outlet flow path 33f. Therefore, even if sedimentation occurs in the post-filter chamber 36, the effects of sedimentation can be reduced by discharging and mixing the thin liquid in the upper part of the post-filter chamber 36 and the thick liquid in the lower part of the post-filter chamber 36.

[0057] (3-3) When the first outlet flow path 33f and the second outlet flow path 33s have the same diameter, the liquid tends to flow toward the first outlet flow path 33f due to the relative arrangement. In this regard, the first outlet flow path 33f has a smaller diameter than the second outlet flow path 33s. This makes it easier for the liquid to flow toward the second outlet flow path 33s.

[0058] [Fourth embodiment] Next, a fourth embodiment of the filter unit will be described with reference to the drawings. In this embodiment, the same components as those in the above-described embodiment will be designated by the same reference numerals, and redundant description will be omitted.

[0059] <Filter unit> 6 and 7 show the filter unit 28 in a position where it is attached to the upstream connection part 26 and the downstream connection part 27. In FIG.

[0060] As shown in FIGS. 6 and 7, the filter unit 28 may include a filter 30, a pre-filter chamber 35, a post-filter chamber 36, an inlet flow channel 32, an outlet flow channel 33, and ribs 44.

[0061] The filter chamber 31 has a partition wall 51. The partition wall 51 separates the filter chamber 35 from the post-filter chamber 36. The filter chamber 35 and the post-filter chamber 36 may be arranged side by side in the horizontal direction.

[0062] 7, the partition wall 51 may be provided at an angle with respect to the vertical direction Z so that the space above the filter front chamber 35 is smaller than the space below the filter front chamber 35. The distance between the upper end of the side surface 38 and the filter 30 is smaller than the distance between the lower end of the side surface 38 and the filter 30. The area of ​​the top surface 39 is smaller than the area of ​​the bottom surface 40. The filter 30 is provided in an opening in the partition wall 51.

[0063] A plurality of ribs 44 may be provided on the side surface 38. The plurality of ribs 44 may be different in size from one another. For example, the upper ribs 44 may be smaller than the lower ribs 44. The ribs 44 do not contact the filter 30.

[0064] <Operation of the Fourth Embodiment> The operation of this embodiment will be described. As shown in Figures 6 and 7, when filling filter unit 28 with liquid, the liquid is introduced into pre-filter chamber 35 from inlet flow path 32. The liquid passes through filter 30 and flows into post-filter chamber 36. The liquid in post-filter chamber 36 is discharged from outlet flow path 33.

[0065] <Effects of the Fourth Embodiment> The effects of this embodiment will be described. (4-1) Air bubbles tend to accumulate in the upper space in the front-filter chamber 35. In this regard, the upper space of the front-filter chamber 35 is smaller than the lower space. Therefore, the amount of air bubbles remaining in the front-filter chamber 35 can be reduced.

[0066] (4-2) The filter front chamber 35 has ribs 44 provided on the side surface 38. The ribs 44 interrupt the flow of liquid introduced into the filter front chamber 35. In other words, the ribs 44 disrupt the flow of liquid, thereby agitating the liquid.

[0067] [Fifth embodiment] Next, a fifth embodiment of the filter unit will be described with reference to the drawings. In this embodiment, the same components as those in the above embodiments are designated by the same reference numerals, and redundant description will be omitted.

[0068] <Filter unit> FIG. 8 illustrates the filter unit 28 in an attached position to the upstream connection 26 and the downstream connection 27 .

[0069] As shown in FIG. 8, the filter unit 28 may include a filter 30, a pre-filter chamber 35 (not shown in FIG. 8), a post-filter chamber 36, an inlet flow path 32, a first outlet flow path 33f, and a second outlet flow path 33s.

[0070] The first outlet 46f is located at the top of the post-filter chamber 36. The second outlet 46s is provided at the bottom of the post-filter chamber 36. The first outlet flow path 33f discharges the liquid from the post-filter chamber 36 via the first outlet 46f. The first outlet flow path 33f is a flow path from the first outlet 46f to the downstream connecting portion 27.

[0071] The second outlet flow path 33s discharges the liquid from the post-filter chamber 36 via the second outlet 46s. The second outlet flow path 33s may be provided along the periphery of the post-filter chamber 36. The second outlet flow path 33s merges with the first outlet flow path 33f. The second outlet flow path 33s is a flow path from the second outlet 46s to the first outlet 46f.

[0072] <Operation of the Fifth Embodiment> The operation of this embodiment will be described. When the filter unit 28 is filled with liquid, the liquid level that has passed through the filter 30 gradually rises. A second outlet 46s is provided at the bottom of the post-filter chamber 36. The liquid in the post-filter chamber 36 flows into the second outlet flow path 33s. The liquid level in the second outlet flow path 33s rises together with the liquid level in the post-filter chamber 36. Therefore, when the liquid level in the post-filter chamber 36 rises to the first outlet 46f, the second outlet flow path 33s is filled with liquid.

[0073] Before the post-filter chamber 36 is filled with liquid, the first outlet flow path 33f discharges the air in the post-filter chamber 36 and the second outlet flow path 33s. When the post-filter chamber 36 is filled with liquid, the first outlet flow path 33f discharges the liquid.

[0074] When the liquid that has settled in the post-filter chamber 36 is supplied to the liquid discharger 12, a liquid with a low concentration is discharged from the first outlet flow path 33f, and a liquid with a high concentration is discharged from the second outlet flow path 33s. A mixture of a liquid with a low concentration and a liquid with a high concentration may be supplied to the liquid discharger 12.

[0075] [Sixth embodiment] Next, a sixth embodiment of the filter unit will be described with reference to the drawings. In this embodiment, the same components as those in the above embodiments are designated by the same reference numerals, and redundant description will be omitted.

[0076] <Filter unit> 9 and 10 show the filter unit 28 in a position where it is attached to the upstream connection part 26 and the downstream connection part 27. In FIG.

[0077] As shown in Figures 9 and 10, the filter unit 28 includes a first filter 30f, a pre-filter chamber 35, a post-filter chamber 36, an inlet flow path 32, a first outlet flow path 33f, a second outlet flow path 33s, a bypass flow path 48, and a second filter 30s.

[0078] The filter unit 28 includes a confluent flow path 53. The confluent flow path 53 is connected to the downstream connection portion 27. The first outlet flow path 33f, the second outlet flow path 33s, and the bypass flow path 48 converge into the confluent flow path 53. The diameter of the confluent flow path 53 is larger than the diameters of the first outlet flow path 33f, the second outlet flow path 33s, and the bypass flow path 48. Of the diameters of the first outlet flow path 33f, the second outlet flow path 33s, the bypass flow path 48, and the confluent flow path 53, the diameter of the confluent flow path 53 is the largest.

[0079] <Operation of the Sixth Embodiment> The operation of this embodiment will be described. When filling the filter unit 28 with liquid, if the liquid level in the combined flow path 53 rises faster than the liquid level in the filter front chamber 35, there is a risk that the second filter 30s will become wet before the air bubbles are discharged from the bypass flow path 48. In this regard, the diameter of the combined flow path 53 is larger than the diameters of the first outlet flow path 33f, the second outlet flow path 33s, and the bypass flow path 48. Therefore, the rate at which the liquid level in the combined flow path 53 rises can be slowed down.

[0080] <Effects of the Sixth Embodiment> The effects of this embodiment will be described. (6-1) The diameter of the junction flow path 53 is larger than the diameters of the first outlet flow path 33f, the second outlet flow path 33s, and the bypass flow path 48. Therefore, the liquids sent from the first outlet flow path 33f, the second outlet flow path 33s, and the bypass flow path 48 can be efficiently mixed together.

[0081] [Example of change] This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0082] The filter unit 28 may not have the ribs 44. The filter unit 28 may have the ribs 44 provided on both the bottom surface 40 and the side surfaces 38. The ribs 44 may be provided on the top surface 39. The ribs 44 may be provided on the partition wall 51.

[0083] At least two of the first outlet flow path 33f, the second outlet flow path 33s, the bypass flow path 48, and the merging flow path 53 may have the same diameter. The diameter of the merging flow path 53 may be smaller than the diameter of at least one of the first outlet flow path 33f, the second outlet flow path 33s, and the bypass flow path 48.

[0084] The first outlet flow path 33f and the second outlet flow path 33s may have the same diameter. The diameter of the second outlet flow path 33s may be smaller than the diameter of the first outlet flow path 33f. The partition wall 51 may be provided along the vertical direction Z.

[0085] The filter front chamber 35 may be located above the upper end of the filter 30 or the first filter 30f. The filter unit 28 may be fixed to at least one of the upstream connection 26 and the downstream connection 27 .

[0086] The liquid flow device 13 may be provided separately from the liquid ejection device 11 . The liquid ejection device 11 may be a liquid ejection device that ejects or discharges liquids other than ink. The liquid ejected as minute droplets from the liquid ejection device may be in the form of granules, tears, or strings. The liquid referred to here may be any material that can be ejected from the liquid ejection device. For example, the liquid may be in any liquid phase, including fluids such as high or low viscosity liquids, sols, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals, and metal melts. The liquid may refer not only to a single state of matter, but also to solid functional material particles, such as pigments and metal particles, dissolved, dispersed, or mixed in a solvent. Typical examples of liquids include inks and liquid crystals, as described in the above embodiments. Here, ink encompasses various liquid compositions, such as general water-based inks and oil-based inks, as well as gel inks and hot-melt inks. Specific examples of liquid ejection devices include devices that eject liquids containing dispersed or dissolved materials such as electrode materials and color materials used in the manufacture of liquid crystal displays, electroluminescent displays, surface-emitting displays, and color filters. The liquid ejection device may be a device that ejects bioorganic materials used in biochip manufacture, a device used as a precision pipette to eject sample liquids, a textile printing device, a microdispenser, or the like. The liquid ejection device may be a device that ejects lubricating oil with pinpoint accuracy onto precision machinery such as watches and cameras, or a device that ejects transparent resin liquids such as ultraviolet-curing resins onto substrates to form micro-hemispherical lenses, optical lenses, and the like used in optical communication elements. The liquid ejection device may also be a device that ejects etching liquids such as acids or alkalis to etch substrates, etc.

[0087] [Definition] The phrase "at least one" as used herein means "one or more" of the desired options. As an example, the phrase "at least one" as used herein means "only one option" or "both of two options" when the number of options is two. As another example, the phrase "at least one" as used herein means "only one option," "any combination of two options," or "any combination of three or more options" when the number of options is three or more.

[0088] [Note] The technical concepts and effects that can be understood from the above-described embodiment and modified examples will be described below.

[0089] (A) The filter unit is a filter unit that can be attached to and detached from the upstream connection part and the downstream connection part, and comprises a filter that filters liquid, a filter chamber having a pre-filter chamber and a post-filter chamber partitioned by the filter, an inlet flow path that introduces liquid into the pre-filter chamber via an inlet, and an outlet flow path that discharges liquid from the post-filter chamber via an outlet, and when attached to the upstream connection part and the downstream connection part, the inlet is located at the bottom of the pre-filter chamber, the outlet is located at the top of the post-filter chamber, and the bottom surface of the pre-filter chamber is inclined upward from the position of the inlet.

[0090] When filling a filter unit with liquid, air bubbles tend to remain at the top. In this regard, with this configuration, the inlet is located at the bottom of the pre-filter chamber. The liquid introduced into the pre-filter chamber from the inlet rises along the inclined bottom surface, passes through the filter, and flows into the post-filter chamber. The outlet is located at the top of the post-filter chamber. Because the filter unit can be filled with liquid while air bubbles are being discharged from the outlet, air bubbles can be discharged more efficiently.

[0091] (B) In the filter unit described in (A), the filter front chamber may be located below the upper end of the filter. For example, if the filter front chamber has a space above the filter, there is a risk of air bubbles remaining in this space. In this regard, with this configuration, the filter front chamber is located below the upper end of the filter. Therefore, by eliminating the space where air tends to remain, it is possible to reduce the amount of remaining air bubbles.

[0092] (C) In the filter unit described in (A) or (B), when the filter is a first filter, the filter unit may further include a second filter and a bypass flow path connecting the filter front chamber and the outlet flow path, the bypass flow path being connected to a bypass port located at the top of the filter front chamber, and the second filter being provided in the bypass flow path.

[0093] For example, in the case of a filter with high wettability and strong capillary force, the rate at which the liquid absorbed by the filter rises may be faster than the rate at which the liquid level rises. Gas easily passes through a dry filter, but has difficulty passing through a wet filter. Therefore, when a filter that easily gets wet is used, air bubbles are likely to remain in the filter front chamber. In this regard, with this configuration, a bypass flow path is connected to the top of the filter front chamber. The bypass flow path can discharge air bubbles from the filter front chamber, improving bubble discharge performance. The liquid flowing through the bypass flow path passes through the second filter and merges with the outlet flow path. Therefore, the liquid flowing through the bypass flow path does not need to be discarded and can be used.

[0094] (D) In ​​the filter unit described in (A) to (C), the filter chamber may have a partition wall that separates the pre-filter chamber and the post-filter chamber, the partition wall being inclined relative to the vertical direction so that the space above the pre-filter chamber is smaller than the space below the pre-filter chamber, and the filter may be provided in an opening in the partition wall.

[0095] Air bubbles in the front-of-filter chamber tend to accumulate in the upper space. In this regard, with this configuration, the upper space of the front-of-filter chamber is smaller than the lower space, which reduces the amount of air bubbles that accumulate in the front-of-filter chamber.

[0096] (E) In the filter unit described in (A) to (D), when the outlet is a first outlet and the outlet flow path is a first outlet flow path, the filter unit may further include a second outlet flow path that discharges liquid from the post-filter chamber, and the second outlet flow path may merge the liquid discharged from the post-filter chamber via a second outlet provided at the bottom of the post-filter chamber into the first outlet flow path.

[0097] With this configuration, the liquid in the post-filter chamber is discharged through the first outlet flow path and the second outlet flow path. The first outlet flow path discharges the liquid from a first outlet located at the top of the post-filter chamber. The second outlet flow path discharges the liquid from a second outlet located at the bottom of the post-filter chamber. The second outlet flow path merges with the first outlet flow path. Therefore, even if sedimentation occurs in the post-filter chamber, the effects of sedimentation can be reduced by discharging and mixing the thin liquid in the upper part of the post-filter chamber and the thick liquid in the lower part of the post-filter chamber.

[0098] In the filter unit described in (F) and (E), the diameter of the first outlet flow path may be smaller than the diameter of the second outlet flow path. When the first and second outlet flow paths have the same diameter, liquid tends to flow more easily through the first outlet flow path due to their relative positions. However, with this configuration, the first outlet flow path has a smaller diameter than the second outlet flow path, which makes it easier for liquid to flow through the second outlet flow path.

[0099] In the filter unit described in (G) and (E), when the filter is a first filter, the filter unit may further include a second filter and a bypass flow path connecting the filter front chamber and the first outlet flow path, the bypass flow path being connected to a bypass port located at the top of the filter front chamber, and the second filter being provided in the bypass flow path.

[0100] This configuration can provide the same effects as the above-mentioned filter unit. In the filter unit described in (H)(E), when the filter is a first filter, the filter unit may include a converging flow path connected to the downstream connection portion, a bypass flow path connected to a bypass port located at the top of the filter front chamber, and a second filter provided in the bypass flow path, wherein the first outlet flow path, the second outlet flow path, and the bypass flow path merge into the converging flow path, and the diameter of the converging flow path may be the largest among the diameters of the first outlet flow path, the second outlet flow path, the bypass flow path, and the converging flow path.

[0101] With this configuration, the diameter of the merging channel is larger than the diameters of the first outlet channel, the second outlet channel, and the bypass channel, respectively, so that the liquids sent from the first outlet channel, the second outlet channel, and the bypass channel can be efficiently mixed together.

[0102] In the filter units described in (I)(A) to (H), the filter front chamber may have a plurality of ribs provided on the bottom surface. According to this configuration, the filter front chamber has ribs provided on the bottom surface. The ribs interrupt the flow of liquid introduced into the filter front chamber. In other words, the ribs disrupt the flow of liquid, thereby agitating the liquid.

[0103] (J) In the filter unit described in (A) to (I), the filter front chamber may have a plurality of ribs provided on the side surface. According to this configuration, the filter front chamber has ribs provided on the side surfaces. The ribs interrupt the flow of liquid introduced into the filter front chamber. In other words, the ribs disrupt the flow of liquid, thereby agitating the liquid.

[0104] (K) A liquid flow device includes a filter unit described in (A) to (J), the upstream connection part, the downstream connection part, an upstream flow path connected to the upstream connection part, and a downstream flow path connected to the downstream connection part.

[0105] This configuration can achieve the same effects as the above-mentioned filter unit. (L) A liquid ejection device includes the liquid flow device described in (K) and a liquid ejection unit capable of ejecting liquid.

[0106] This configuration can achieve the same effects as the above-mentioned filter unit. [Explanation of symbols]

[0107] 11...liquid discharge device, 12...liquid discharge portion, 13...liquid flow device, 14...mounting portion, 16...nozzle, 17...medium, 19...liquid supply source, 21...first one-way valve, 22...supply pump, 23...second one-way valve, 24...upstream flow path, 25...downstream flow path, 26...upstream connection portion, 27...downstream connection portion, 28...filter unit, 30...filter, 30f...first filter, 30s...second filter, 31...filter Filter chamber, 32...inlet flow path, 33...outlet flow path, 33f...first outlet flow path, 33s...second outlet flow path, 35...pre-filter chamber, 36...post-filter chamber, 38...side, 39...top surface, 40...bottom surface, 42...inlet port, 44...rib, 46...outlet, 46f...first outlet, 46s...second outlet, 48...bypass flow path, 49...bypass port, 51...partition wall, 53...merging flow path, D...supply direction, Z...vertical direction.

Claims

1. A filter unit detachable from an upstream connection part and a downstream connection part, A filter for filtering the liquid; a filter chamber having a pre-filter chamber and a post-filter chamber partitioned by the filter; an inlet flow path that introduces a liquid into the filter front chamber through an inlet; an outlet flow path that discharges liquid from the post-filter chamber through an outlet; Equipped with In the position where the upstream connection portion and the downstream connection portion are attached, the inlet is located at the bottom of the filter front chamber, The outlet is located at the top of the post-filter chamber, A filter unit characterized in that the bottom surface of the filter front chamber is inclined upward from the position of the inlet.

2. The filter unit according to claim 1 , wherein the filter front chamber is located below an upper end of the filter.

3. When the filter is a first filter, A second filter; a bypass flow path connecting the filter front chamber and the outlet flow path; Equipped with The bypass flow path is connected to a bypass port located at the top of the filter front chamber, The filter unit according to claim 1 , wherein the second filter is provided in the bypass flow path.

4. the filter chamber has a partition wall that separates the pre-filter chamber and the post-filter chamber, the partition wall is provided at an angle with respect to the vertical direction so that a space above the filter front chamber is smaller than a space below the filter front chamber, The filter unit according to claim 1 , wherein the filter is provided in an opening in the partition wall.

5. When the outlet is a first outlet and the outlet flow path is a first outlet flow path, a second outlet flow path that discharges liquid from the post-filter chamber; 2. The filter unit according to claim 1, wherein the second outlet flow path merges the liquid discharged from the post-filter chamber via a second outlet provided at the bottom of the post-filter chamber with the first outlet flow path.

6. The filter unit according to claim 5 , wherein the diameter of the first outlet flow path is smaller than the diameter of the second outlet flow path.

7. When the filter is a first filter, A second filter; a bypass flow path connecting the filter front chamber and the first outlet flow path; Equipped with The bypass flow path is connected to a bypass port located at the top of the filter front chamber, The filter unit according to claim 5 , wherein the second filter is provided in the bypass flow path.

8. When the filter is a first filter, a confluence flow path connected to the downstream connection portion; a bypass flow path connected to a bypass port located at the top of the filter front chamber; a second filter provided in the bypass flow path; Equipped with the first outlet flow path, the second outlet flow path, and the bypass flow path merge into the merging flow path, 6. The filter unit according to claim 5, wherein the diameter of the confluence channel is the largest among the diameters of the first outlet channel, the second outlet channel, the bypass channel, and the confluence channel.

9. The filter unit according to claim 1 , wherein the filter front chamber has a plurality of ribs provided on the bottom surface.

10. The filter unit according to claim 1 , wherein the filter front chamber has a plurality of ribs provided on a side surface thereof.

11. A filter unit according to any one of claims 1 to 10; the upstream connection portion; the downstream connection portion; an upstream flow path connected to the upstream connection portion; a downstream flow path connected to the downstream connection portion; A liquid flowing device comprising:

12. The liquid flow device of claim 11; a liquid ejection unit capable of ejecting liquid; A liquid ejection device comprising:

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