Filter unit, liquid flow device, and liquid discharge device

Abstract

The invention discloses a filter unit, a liquid flow apparatus, and a liquid discharge apparatus. A filter unit that can be attached to and detached from an upstream connection part and a downstream connection part, the filter unit being provided with: a filter that filters a liquid; a filter chamber having a filter front chamber and a filter rear chamber partitioned by the filter; an introduction flow path for introducing a liquid into the filter front chamber via the introduction port; and a first leading-out flow path for leading out the liquid from the filter rear chamber via the first leading-out port, in a posture of being attached to the upstream connection part and the downstream connection part, the leading-in port is located at the lowermost part of the filter front chamber, the first leading-out port is located at the uppermost part of the filter rear chamber, and the bottom surface of the filter front chamber is inclined upward from the position of the leading-in port.

Description

Technical Field

[0001] The invention relates to a filter unit, a liquid flow device and a liquid spraying device. Background Art

[0002] For example, as described in Patent Document 1, a filter unit includes a filter, a first ink chamber as an example of a filter front chamber, and a second ink chamber as an example of a filter rear chamber. Ink flows into the first ink chamber from an ink chamber inlet as an example of an inlet port. The ink chamber inlet is located above the first ink chamber. The ink flowing 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 the ink chamber outlet as an example of a lead-out port to an ink outlet. The ink outlet extends downward from the second ink chamber.

[0003] Patent Document 1: Japanese Patent Application Laid-Open No. 2006-248058

[0004] In the filter unit of Patent Document 1, ink that flows in from above and passes through the filter flows out downward. Therefore, there is a possibility that air bubbles may remain when the filter unit is filled with liquid. Summary of the Invention

[0005] The filter unit that solves the above technical problems is a filter unit that can be disassembled and assembled relative to an upstream connection part and a downstream connection part located vertically above the upstream connection part, and the filter unit comprises: a filter for filtering liquid; a filter chamber having a filter front chamber and a filter rear chamber separated by the filter; an inlet flow path for introducing liquid into the filter front chamber via an inlet port; and an outlet flow path for discharging liquid from the filter rear chamber via an outlet port, and when installed at the upstream connection part and the downstream connection part, the inlet port is located at the lowermost part of the filter front chamber, the outlet port is located at the uppermost part of the filter rear chamber, and the bottom surface of the filter front chamber is inclined upward from the position of the inlet port.

[0006] A liquid flow device that solves the above-mentioned technical problems includes: the filter unit having the above-mentioned structure; the upstream connecting portion; the downstream connecting portion; an upstream flow path connected to the upstream connecting portion; and a downstream flow path connected to the downstream connecting portion.

[0007] A liquid ejection device that solves the above-mentioned technical problems includes: a liquid flow device having the above-mentioned structure; and a liquid ejection portion capable of ejecting liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a schematic diagram of a first embodiment of the liquid ejecting device.

[0009] Figure 2 1 is a schematic cross-sectional view of a first embodiment of a filter unit.

[0010] Figure 3 yes Figure 2 The 3-3 line section view.

[0011] Figure 4 2 is a schematic cross-sectional view of a second embodiment of a filter unit.

[0012] Figure 5 It is a schematic cross-sectional view of a third embodiment of the filter unit.

[0013] Figure 6 It is a schematic cross-sectional view of a fourth embodiment of the filter unit.

[0014] Figure 7 yes Figure 6 Sectional view along line 7-7.

[0015] Figure 8 It is a schematic cross-sectional view of a fifth embodiment of the filter unit.

[0016] Figure 9 It is a schematic cross-sectional view of a sixth embodiment of the filter unit.

[0017] Figure 10 It is a schematic cross-sectional view of a sixth embodiment of the filter unit.

[0018] Description of Reference Numerals

[0019] 11…Liquid ejection device; 12…Liquid ejection portion; 13…Liquid flow device; 14…Assembly portion; 16…Nozzle; 17…Medium; 19…Liquid supply source; 21…First check valve; 22…Supply pump; 23…Second check valve; 24…Upstream flow path; 25…Downstream flow path; 26…Upstream connecting portion; 27…Downstream connecting portion; 28…Filter unit; 30…Filter; 30f…First filter; 30s…Second filter; 31…Filter chamber; 32…inlet flow path; 33…outlet flow path; 33f…first outlet flow path; 33s…second outlet flow path; 35…filter front chamber; 36…filter rear chamber; 38…side surface; 39…top surface; 40…bottom surface; 42…inlet port; 44…rib; 46…outlet port; 46f…first outlet port; 46s…second outlet port; 48…bypass flow path; 49…bypass port; 51…partition wall; 53…merging flow path; D…supply direction; Z…vertical direction. DETAILED DESCRIPTION

[0020] First embodiment

[0021] A first embodiment of a filter unit, a liquid flow device, and a liquid ejecting device will be described below with reference to the accompanying drawings. The liquid ejecting device is, for example, an inkjet printer that prints by ejecting ink, an example of liquid, onto a medium such as paper.

[0022] In the accompanying drawings, it is assumed that the liquid ejection portion 12 is placed on a horizontal plane, the Z axis represents the direction of gravity, and the X axis and Y axis represent the direction along the horizontal plane. The X axis, Y axis, and Z axis are orthogonal to each other. In the following description, the direction parallel to the Z axis will also be referred to as the vertical direction Z.

[0023] Liquid spraying device

[0024] like Figure 1 As shown, the liquid ejecting device 11 includes a liquid ejecting portion 12 and a liquid flow device 13. The liquid ejecting device 11 may also include a mounting portion 14.

[0025] The liquid ejecting unit 12 can eject liquid. The liquid ejecting unit 12 has one or more nozzles 16 . The liquid ejecting unit 12 ejects liquid from the nozzles 16 to print on a medium 17 .

[0026] A liquid supply source 19 for storing liquid is detachably mounted on the mounting portion 14 . When the liquid supply source 19 is a tank capable of replenishing liquid, the liquid supply source 19 may be fixed to the mounting portion 14 .

[0027] Liquid flow device

[0028] The liquid flow device 13 supplies liquid from a liquid supply source 19 attached to the attachment portion 14 to the liquid ejection portion 12. The liquid flow device 13 may also include a first check valve 21, a supply pump 22, and a second check valve 23. The liquid flow device 13 includes an upstream flow path 24, a downstream flow path 25, an upstream connection portion 26, a downstream connection portion 27, and a filter unit 28.

[0029] The first one-way valve 21, the supply pump 22, and the second one-way valve 23 may also 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 toward the downstream side of the supply direction D and restrict the flow of liquid toward the upstream side.

[0030] The supply pump 22 is disposed between the first check valve 21 and the second check 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 toward the upstream flow path 24. The supply pump 22 pressurizes the liquid discharged from the liquid supply source 19 to supply the liquid to the liquid ejection unit 12.

[0031] The upstream flow path 24 is connected to the upstream connection portion 26. The downstream end of the upstream flow path 24 is connected to the upstream connection portion 26. The upstream end of the upstream flow path 24 may also be provided on the mounting portion 14. The upstream end of the upstream flow path 24 may be, for example, a hollow needle that pierces the liquid supply source 19. The upstream flow path 24 is connected to the liquid supply source 19 mounted on the mounting portion 14 via its upstream end, and can discharge the liquid contained in the liquid supply source 19.

[0032] The downstream flow path 25 is connected to the downstream connection portion 27. The upstream end of the downstream flow path 25 is connected to the downstream connection portion 27. The downstream end of the downstream flow path 25 is connected to the liquid ejection portion 12.

[0033] The upstream connection portion 26 may be located below the downstream connection portion 27 in the vertical direction Z.

[0034] filter unit

[0035] like Figure 2 As shown, the filter unit 28 can be detached relative to the upstream connection part 26 and the downstream connection part 27. Figure 2 , the filter unit 28 is shown in a posture in which it is attached to the upstream connection portion 26 and the downstream connection portion 27 .

[0036] The filter unit 28 includes a filter 30 , a filter chamber 31 , an inlet flow path 32 , a first outlet flow path 33 f as an example of an outlet flow path, and a second outlet flow path 33 s .

[0037] 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, etc. The filter 30 may also be cylindrical.

[0038] The filter chamber 31 includes a filter front chamber 35 and a filter rear chamber 36 . The filter front chamber 35 and the filter rear chamber 36 are separated by the filter 30 .

[0039] The filter front chamber 35 may surround the outside of the filter 30 and the filter rear chamber 36. The filter front chamber 35 may have side surfaces 38, a top surface 39, and a bottom surface 40. The filter front chamber 35 may be located below the upper end of the filter 30. The filter front chamber 35 does not have space above the filter 30.

[0040] The top surface 39 is located below the upper end of the filter 30. The top surface 39 is a plane having an end in contact with the filter 30 at the highest position. The top surface 39 may be inclined upward from the side surface 38 toward the filter 30.

[0041] An inlet 42 may also be provided on the side surface 38. The inlet 42 is located at the lowest portion of the filter front chamber 35. The lower end of the inlet 42 is in contact with the bottom surface 40.

[0042] The bottom surface 40 is inclined upward from the position of the introduction port 42. The end of the bottom surface 40 on the introduction port 42 side is located at the lowest position. The end of the bottom surface 40 on the side opposite to the introduction port 42 is located at the highest position.

[0043] like Figure 2 、 Figure 3 As shown, the filter front chamber 35 may also have a plurality of ribs 44. The plurality of ribs 44 are provided on the bottom surface 40 of the filter front chamber 35. The ribs 44 may also be arc-shaped. The distance between the ends of adjacent ribs 44 away from the inlet 42 may be longer than the distance between the ends closer to the inlet 42.

[0044] like Figure 2 As shown, the upstream end of the introduction flow path 32 is detachably connected to the upstream connection portion 26. The downstream end of the introduction flow path 32 is connected to the filter front chamber 35. The introduction flow path 32 introduces liquid into the filter front chamber 35 via the introduction port 42.

[0045] The filter back chamber 36 may also be the space inside the filter 30. The filter back chamber 36 may also have a first outlet 46f and a second outlet 46s as examples of outlets. The first outlet 46f is located at the top of the filter back chamber 36. The second outlet 46s is provided at the bottom of the filter back chamber 36.

[0046] The downstream end of the first outlet flow path 33f is detachably connected to the downstream connection portion 27. The upstream end of the first outlet flow path 33f is connected to the filter post chamber 36. The first outlet flow path 33f outlets the liquid from the filter post chamber 36 via the first outlet port 46f.

[0047] The downstream end of the second outlet flow path 33s is detachably connected to the downstream connection portion 27. The upstream end of the second outlet flow path 33s is connected to the filter post chamber 36. The second outlet flow path 33s outlets the liquid from the filter post chamber 36 via the second outlet port 46s.

[0048] Effects of the First Embodiment

[0049] The operation of this embodiment will be described.

[0050] like Figure 2 As shown, when the filter unit 28 is filled with liquid, the liquid is introduced from the inlet flow path 32 into the filter front chamber 35. The liquid level rises along the inclined bottom surface 40. When the liquid level rises to the filter 30, the liquid passes through the filter 30 and flows into the filter rear chamber 36.

[0051] The upper end of the filter 30 is located above the filter front chamber 35. Therefore, before the filter front chamber 35 is filled with liquid, the air in the filter front chamber 35 contacts the filter 30. As the liquid level rises, the liquid in the filter front chamber 35 squeezes out the air in the filter front chamber 35. The air in the filter front chamber 35 then moves through the filter 30 to the filter rear chamber 36.

[0052] The first outlet flow path 33f outlets the air in the filter post chamber 36 before the filter post chamber 36 is filled with liquid. When the filter post chamber 36 is filled with liquid, the first outlet flow path 33f outlets the liquid.

[0053] When liquid is supplied to the liquid ejector 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 disrupted by the ribs 44. Thus, the liquid in the filter front chamber 35 is stirred by the introduced liquid.

[0054] The liquid in the filter rear chamber 36 can also be discharged through the first discharge flow path 33f and the second discharge flow path 33s. If precipitation occurs in the filter rear chamber 36, the dilute liquid is discharged through the first discharge flow path 33f, and the dense liquid is discharged through the second discharge flow path 33s. Alternatively, the dilute liquid and the dense liquid can be mixed and supplied to the liquid discharge unit 12.

[0055] Effects of the First Embodiment

[0056] The effects of this embodiment will be described.

[0057] (1-1) When filling the filter unit 28 with liquid, bubbles tend to remain at the top. Regarding this, the inlet port 42 is located at the lowest portion of the filter front chamber 35. The liquid introduced into the filter front chamber 35 through the inlet port 42 rises along the inclined bottom surface 40, passes through the filter 30, and flows into the filter rear chamber 36. The first outlet port 46f is located at the uppermost portion of the filter rear chamber 36. Since the liquid can be filled while bubbles are being discharged from the first outlet port 46f, the efficiency of bubble discharge can be improved.

[0058] (1-2) For example, if the filter front chamber 35 has a space above the filter 30, air bubbles may 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, the retention of air bubbles can be reduced.

[0059] (1-3) The filter front chamber 35 has ribs 44 provided on the bottom surface 40. The ribs 44 block the flow of the liquid introduced into the filter front chamber 35. That is, the ribs 44 disrupt the flow of the liquid, thereby stirring the liquid.

[0060] (1-4) The bottom surface 40 of the filter pre-chamber 35 is inclined upward from the position of the inlet 42. Therefore, liquid flowing into the filter pre-chamber 35 from the inlet 42 tends to flow upward near the inlet 42. Therefore, even when using a liquid that tends to settle over time, the settled liquid can be stirred.

[0061] Second embodiment

[0062] 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 are denoted by the same reference numerals, and redundant descriptions are omitted.

[0063] filter unit

[0064] exist Figure 4 , the filter unit 28 is shown in a posture in which it is attached to the upstream connection portion 26 and the downstream connection portion 27 .

[0065] like Figure 4 As shown, the filter unit 28 may include a filter 30 , a filter front chamber 35 , a filter rear chamber 36 , an inlet flow path 32 , an outlet flow path 33 , and ribs 44 .

[0066] The filter 30 may have a conical shape with the lower end in the vertical direction Z as the vertex.

[0067] The filter front chamber 35 may be located below the filter 30 and the filter rear chamber 36. The filter front chamber 35 may have a top surface 39, a bottom surface 40, and an inlet 42. The filter front chamber 35 is located below the upper end of the filter 30.

[0068] The inlet 42 may be opened in the bottom surface 40. The inlet 42 is located at the lowest part of the filter front chamber 35. The inlet 42 may be located at the center of the bottom surface 40. The inlet 42 may be located directly below the apex of the filter 30.

[0069] The bottom surface 40 is inclined upward from the position of the introduction port 42. The bottom surface 40 is located at the lowest position of the introduction port 42. The bottom surface 40 is located at a position that becomes higher as it is farther from the introduction port 42.

[0070] The introduction flow path 32 introduces liquid into the filter front chamber 35 via the introduction port 42 .

[0071] The filter rear chamber 36 has a lead-out port 46 . The lead-out port 46 is located at the uppermost portion of the filter rear chamber 36 . The lead-out flow path 33 leads the liquid out of the filter rear chamber 36 via the lead-out port 46 .

[0072] Effects of the Second Embodiment

[0073] The operation of this embodiment will be described.

[0074] like Figure 4 As shown, when the filter unit 28 is filled with liquid, the liquid is introduced from the introduction flow path 32 into the filter front chamber 35. The liquid passes through the filter 30 and flows into the filter rear chamber 36.

[0075] The outlet flow path 33 drains air from the filter rear chamber 36 before the filter rear chamber 36 is filled with liquid. Once the filter rear chamber 36 is filled with liquid, the outlet flow path 33 drains the liquid. The drained liquid is then delivered to the liquid ejection unit 12 via the downstream connection portion 27 and the downstream flow path 25.

[0076] Effects of the Second Embodiment

[0077] The effects of this embodiment will be described.

[0078] (2-1) Filter 30 is conical. Therefore, even when liquid is filled in a tilted filter unit 28, a portion of filter 30 can be maintained above the liquid level until filter front chamber 35 is filled with liquid. This reduces the amount of bubbles remaining in filter front chamber 35.

[0079] Third embodiment

[0080] 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 are denoted by the same reference numerals, and redundant descriptions are omitted.

[0081] filter unit

[0082] exist Figure 5 , the filter unit 28 is shown in a posture in which it is attached to the upstream connection portion 26 and the downstream connection portion 27 .

[0083] like Figure 5 As shown, the filter unit 28 may include a first filter 30f as an example of a filter, a filter front chamber 35, a filter rear 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.

[0084] The first filter 30 f may also be cylindrical. The first filter 30 f separates the filter front chamber 35 from the filter rear chamber 36 .

[0085] The top surface 39 may be located above the first filter 30f. A bypass port 49 may be provided on the top surface 39. The bypass port 49 is located at the uppermost portion of the filter front chamber 35. The top surface 39 is inclined downward from the position of the bypass port 49.

[0086] The bypass flow path 48 connects the filter front chamber 35 with the first outlet flow path 33f. The upstream end of the bypass flow path 48 is connected to the 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 guides the liquid out of the filter front chamber 35 via the bypass port 49. The second filter 30s may also be provided in the bypass flow path 48. The second filter 30s is located above the first filter 30f.

[0087] The diameter of the first outlet flow path 33f may be smaller than the diameter of the second outlet flow path 33s.

[0088] The second outlet flow path 33s may connect the filter post-chamber 36 and the first outlet flow path 33f. The downstream end of the second outlet flow path 33s may also be connected to the first outlet flow path 33f. The second outlet flow path 33s allows the liquid discharged from the filter post-chamber 36 to merge with the first outlet flow path 33f.

[0089] Effects of the Third Embodiment

[0090] The operation of this embodiment will be described.

[0091] like Figure 5 As shown, when the filter unit 28 is filled with liquid, the liquid is introduced from the inlet flow path 32 into the filter front chamber 35. When the liquid contacts the first filter 30f, the first filter 30f absorbs the liquid. In the case of a first filter 30f with excellent absorbency, the first filter 30f may absorb the liquid faster than the liquid level in the filter front chamber 35 rises. If the entire first filter 30f is wet before the filter front chamber 35 is filled with liquid, air cannot be discharged through the first filter 30f.

[0092] When the entire first filter 30f is wetted, the air in the filter front chamber 35 is discharged from 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 flowing into the bypass flow path 48 passes through the second filter 30s, the first outlet flow path 33f, the downstream connecting portion 27, and the downstream flow path 25, and is then delivered to the liquid ejection portion 12.

[0093] Effects of the Third Embodiment

[0094] The effects of this embodiment will be described.

[0095] (3-1) For example, in the case of a first filter 30f having high wettability and strong capillary force, the liquid absorbed by the first filter 30f may rise faster than the liquid surface. Gas easily passes through an unwetted first filter 30f but has difficulty passing through a wetted first filter 30f. Therefore, when using a first filter 30f that is easily wetted, bubbles tend to remain in the filter front chamber 35. In this regard, a bypass flow path 48 is connected to the uppermost portion of the filter front chamber 35. Since the bypass flow path 48 can discharge bubbles from the filter front chamber 35, bubble discharge performance can be improved. The liquid flowing in the bypass flow path 48 passes through the second filter 30s and merges with the first outlet flow path 33f. Therefore, the liquid flowing in the bypass flow path 48 does not need to be discarded and can be reused.

[0096] (3-2) The liquid within the filter back chamber 36 is discharged through the first discharge flow path 33f and the second discharge flow path 33s. The first discharge flow path 33f discharges the liquid from the first discharge port 46f located at the uppermost portion of the filter back chamber 36. The second discharge flow path 33s discharges the liquid from the second discharge port 46s located at the lowermost portion of the filter back chamber 36. The second discharge flow path 33s merges with the first discharge flow path 33f. Therefore, even if sedimentation occurs within the filter back chamber 36, the effects of the sedimentation can be reduced by discharging and mixing the dilute liquid from the upper portion of the filter back chamber 36 with the thicker liquid from the lower portion of the filter back chamber 36.

[0097] (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 into the first outlet flow path 33f due to their arrangement. In this regard, the diameter of the first outlet flow path 33f is smaller than the diameter of the second outlet flow path 33s. This facilitates the flow of liquid into the second outlet flow path 33s.

[0098] Fourth embodiment

[0099] 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 are denoted by the same reference numerals, and redundant descriptions are omitted.

[0100] filter unit

[0101] exist Figure 6 、 Figure 7 , the filter unit 28 is shown in a posture in which it is attached to the upstream connection portion 26 and the downstream connection portion 27 .

[0102] like Figure 6 、 Figure 7As shown, the filter unit 28 may include a filter 30 , a filter front chamber 35 , a filter rear chamber 36 , an inlet flow path 32 , an outlet flow path 33 , and ribs 44 .

[0103] The filter chamber 31 has a partition wall 51. The partition wall 51 partitions the filter front chamber 35 and the filter rear chamber 36. The filter front chamber 35 and the filter rear chamber 36 may be arranged side by side in the horizontal direction.

[0104] like Figure 7 As shown, partition wall 51 may be arranged at an angle relative to vertical direction Z so that the space above filter front chamber 35 is smaller than the space below filter front chamber 35. The distance between the upper end of side surface 38 and filter 30 is smaller than the distance between the lower end of side surface 38 and filter 30. The area of ​​top surface 39 is smaller than the area of ​​bottom surface 40. Filter 30 is disposed at the opening of partition wall 51.

[0105] A plurality of ribs 44 may be provided on the side surface 38. The sizes of the ribs 44 may also be different from each other. For example, the ribs 44 located at the top may be smaller than the ribs 44 located at the bottom. The ribs 44 do not contact the filter 30.

[0106] Effects of the Fourth Embodiment

[0107] The operation of this embodiment will be described.

[0108] like Figure 6 、 Figure 7 As shown, when the filter unit 28 is filled with liquid, the liquid is introduced from the inlet flow path 32 into the filter front chamber 35. The liquid passes through the filter 30 and flows into the filter rear chamber 36. The liquid in the filter rear chamber 36 is discharged from the outlet flow path 33.

[0109] Effects of the Fourth Embodiment

[0110] The effects of this embodiment will be described.

[0111] (4-1) Bubbles in the filter front chamber 35 tend to accumulate in the space above. In this regard, the space above the filter front chamber 35 is smaller than the space below it. Therefore, the amount of bubbles accumulated in the filter front chamber 35 can be reduced.

[0112] (4-2) The filter front chamber 35 has ribs 44 provided on the side surface 38. The ribs 44 block the flow of the liquid introduced into the filter front chamber 35. That is, the ribs 44 disrupt the flow of the liquid, thereby stirring the liquid.

[0113] Fifth embodiment

[0114] 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 embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

[0115] filter unit

[0116] exist Figure 8 , the filter unit 28 is shown in a posture in which it is attached to the upstream connection portion 26 and the downstream connection portion 27 .

[0117] like Figure 8 As shown, the filter unit 28 may also include a filter 30, Figure 8 The filter front chamber 35, the filter rear chamber 36, the inlet flow path 32, the first outlet flow path 33f, and the second outlet flow path 33s are not shown in the figure.

[0118] The first outlet 46f is located at the uppermost portion of the filter rear chamber 36 . The second outlet 46s is provided at the lowermost portion of the filter rear chamber 36 .

[0119] The first outlet flow path 33f leads the liquid out of the filter post chamber 36 via the first outlet port 46f. The first outlet flow path 33f is a flow path extending from the first outlet port 46f to the downstream connecting portion 27.

[0120] The second outlet flow path 33s guides the liquid from the filter rear chamber 36 via the second outlet port 46s. The second outlet flow path 33s may also be provided along the periphery of the filter rear 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 extending from the second outlet port 46s to the first outlet port 46f.

[0121] Effects of the Fifth Embodiment

[0122] The operation of this embodiment will be described.

[0123] When liquid fills the filter unit 28, the liquid level gradually rises after passing through the filter 30. A second outlet 46s is provided at the bottom of the filter rear chamber 36. Liquid in the filter rear chamber 36 flows into the second outlet flow path 33s. The liquid level in the second outlet flow path 33s rises along with the liquid level in the filter rear chamber 36. Therefore, when the liquid level in the filter rear chamber 36 reaches the first outlet 46f, the second outlet flow path 33s is filled with liquid.

[0124] The first outlet flow path 33f outlets the air in the filter post chamber 36 and the second outlet flow path 33s before the filter post chamber 36 is filled with liquid. When the filter post chamber 36 is filled with liquid, the first outlet flow path 33f outlets the liquid.

[0125] When the liquid settled in the filter rear chamber 36 is supplied to the liquid ejection unit 12, the dilute liquid is discharged from the first outlet flow path 33f, and the dense liquid is discharged from the second outlet flow path 33s. Alternatively, the dilute liquid and the dense liquid may be mixed and supplied to the liquid ejection unit 12.

[0126] Sixth embodiment

[0127] 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-described embodiment are denoted by the same reference numerals, and redundant descriptions are omitted.

[0128] filter unit

[0129] exist Figure 9 、 Figure 10 , the filter unit 28 is shown in a posture in which it is attached to the upstream connection portion 26 and the downstream connection portion 27 .

[0130] like Figure 9 、 Figure 10 As shown, the filter unit 28 includes a first filter 30f, a filter front chamber 35, a filter rear 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.

[0131] The filter unit 28 includes a merging flow path 53. The merging 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 merge with the merging flow path 53. The diameter of the merging 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. The merging flow path 53 has the largest diameter among the diameters of the first outlet flow path 33f, the second outlet flow path 33s, the bypass flow path 48, and the merging flow path 53.

[0132] Effects of the Sixth Embodiment

[0133] The operation of this embodiment will be described.

[0134] When the filter unit 28 is filled with liquid, if the liquid level in the merging flow path 53 rises faster than the liquid level in the filter front chamber 35, the second filter 30s may become wet before the bubbles are exhausted from the bypass flow path 48. In this regard, the diameter of the merging 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. This reduces the rate of liquid level rise in the merging flow path 53.

[0135] Effects of the Sixth Embodiment

[0136] The effects of this embodiment will be described.

[0137] (6-1) The diameter of the merging 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 effectively mixed.

[0138] Change Example

[0139] This embodiment can be implemented by being modified as follows: This embodiment and the following modified examples can be implemented in combination with each other within a range that does not technically conflict.

[0140] The filter unit 28 may be configured without the ribs 44. The filter unit 28 may have the ribs 44 provided on both the bottom surface 40 and the side surface 38. The ribs 44 may be provided on the top surface 39. The ribs 44 may be provided on the partition wall 51.

[0141] The diameters of 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 be the same. 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.

[0142] The diameters of the first outlet flow path 33f and the second outlet flow path 33s may be the same, or the diameter of the second outlet flow path 33s may be smaller than the diameter of the first outlet flow path 33f.

[0143] The partition wall 51 may also be provided along the vertical direction Z.

[0144] The filter front chamber 35 may be located above the upper end of the filter 30 or the first filter 30 f .

[0145] The filter unit 28 may be fixed to at least one of the upstream connection portion 26 and the downstream connection portion 27 .

[0146] The liquid flow device 13 can also be provided separately from the liquid ejection device 11 .

[0147] The liquid ejection device 11 may also be a liquid ejection device that sprays or ejects liquids other than ink. The state of the liquid ejected from the liquid ejection device in the form of tiny droplets also includes granular, tear-like, and linear states with tails. The liquid mentioned here can be any material that can be ejected from the liquid ejection device. For example, the liquid can be any liquid in the state of the substance in the liquid phase, including high or low viscosity liquids, sols, gel water, other inorganic solvents, organic solvents, solutions, liquid resins, liquid metals, and fluid bodies such as molten metal. Liquids include not only liquids as a state of matter, but also liquids formed by dissolving, dispersing, or mixing particles of functional materials composed of solid substances such as pigments and metal particles in a solvent. Representative examples of liquids include inks and liquid crystals as described in the above embodiments. Ink here includes 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 electrode materials, coloring materials, and other materials used in the manufacture of liquid crystal displays, electroluminescent displays, surface-emitting displays, and color filters in dispersed or dissolved form. Liquid ejection devices may also be devices that eject bioorganic matter used in the manufacture of biochips, devices used as precision pipettes and ejecting liquids that serve as samples, printing and dyeing devices, micro-dispensers, and the like. Liquid ejection devices may also be devices that accurately eject lubricating oil onto precision machinery such as clocks and cameras, or devices that eject transparent resin liquids such as ultraviolet-curing resins onto substrates in order to form tiny hemispherical lenses, optical lenses, and the like used in optical communication elements. Liquid ejection devices may also be devices that eject etching liquids such as acids or alkalis in order to etch substrates.

[0148] definition

[0149] As used in this specification, the expression "at least one" means "one or more" of the desired options. For example, if there are two options, the expression "at least one" as used in this specification means "only one option" or "both options." As another example, if there are three or more options, the expression "at least one" as used in this specification means "only one option," "a combination of two arbitrary options," or "a combination of three or more arbitrary options."

[0150] Notes

[0151] The following describes the technical ideas and effects understood from the above-described embodiment and modified examples.

[0152] (A) The filter unit is a filter unit that can be detached relative to an upstream connection part and a downstream connection part located vertically above the upstream connection part, and the filter unit comprises: a filter for filtering liquid; a filter chamber having a filter front chamber and a filter rear chamber separated by the filter; an inlet flow path for introducing liquid into the filter front chamber via an inlet port; and a outlet flow path for outleting liquid from the filter rear chamber via an outlet port, wherein, in a posture installed at the upstream connection part and the downstream connection part, the inlet port is located at the lowest part of the filter front chamber, the outlet port is located at the uppermost part of the filter rear chamber, and the bottom surface of the filter front chamber is inclined upward from the position of the inlet port.

[0153] When the filter unit is filled with liquid, bubbles tend to remain at the top. In this regard, according to this configuration, the inlet is located at the lowest part of the filter front chamber. The liquid introduced from the inlet into the filter front chamber rises along the inclined bottom surface and flows through the filter into the filter rear chamber. The outlet is located at the uppermost part of the filter rear chamber. Since the liquid can be filled while bubbles are being discharged from the outlet, the efficiency of bubble removal is improved.

[0154] (B) In the filter unit described in (A), the filter front chamber may be located below an upper end of the filter.

[0155] For example, if the filter front chamber has space above the filter, there is a risk of air bubbles remaining in that space. Regarding this, according to this configuration, the filter front chamber is located below the top of the filter. Therefore, by eliminating the space where air is likely to remain, the likelihood of air bubbles remaining can be reduced.

[0156] (C) In the filter unit described in (A) or (B), when the filter is set as the first filter, the filter unit may 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 uppermost part of the filter front chamber, and the second filter being arranged in the bypass flow path.

[0157] For example, in the case of a filter with high wettability and strong capillary force, the liquid absorbed by the filter sometimes rises faster than the liquid level. Gas easily passes through an unwetted filter, but has difficulty passing through a wetted filter. Therefore, when using a filter that is easy to wet, bubbles tend to remain in the filter front chamber. In this regard, according to this structure, a bypass flow path is connected to the uppermost part of the filter front chamber. Since the bypass flow path can discharge bubbles in the filter front chamber, the bubble discharge performance can be improved. The liquid flowing in the bypass flow path passes through the second filter and merges with the derivation flow path. Therefore, the liquid flowing in the bypass flow path does not need to be discarded and can be utilized.

[0158] (D) In ​​the filter unit described in (A) to (C), the filter chamber may have a partition wall that separates the filter front chamber and the filter rear chamber, the partition wall is arranged to be inclined relative to the vertical direction in a manner such that the space above the filter front chamber is smaller than the space below the filter front chamber, and the filter is arranged at an opening of the partition wall.

[0159] The bubbles in the filter front chamber tend to stay in the space above. In this regard, according to this configuration, the space above the filter front chamber is smaller than the space below. Thus, the bubbles staying in the filter front chamber can be reduced.

[0160] (E) In the filter unit described in (A) to (D), when the outlet is set as the first outlet and the outlet flow path is set as the first outlet flow path, the filter unit may include a second outlet flow path for outlet liquid from the filter rear chamber, and the second outlet flow path allows the liquid outlet from the filter rear chamber via the second outlet provided at the lowermost portion of the filter rear chamber to merge with the first outlet flow path.

[0161] According to this structure, the liquid in the filter rear chamber is discharged by the first discharge flow path and the second discharge flow path. The first discharge flow path discharges the liquid from the first discharge port located at the uppermost part of the filter rear chamber. The second discharge flow path discharges the liquid from the second discharge port located at the lowermost part of the filter rear chamber. The second discharge flow path merges with the first discharge flow path. Therefore, even if precipitation occurs in the filter rear chamber, the influence of precipitation can be reduced by discharging the thin liquid in the upper part of the filter rear chamber and the thick liquid in the lower part of the filter rear chamber and mixing them.

[0162] (F) In the filter unit described in (E), a diameter of the first outlet flow path may be smaller than a diameter of the second outlet flow path.

[0163] When the first and second outlet channels have the same diameter, liquid tends to flow toward the first outlet channel due to their arrangement. In this regard, according to this configuration, the diameter of the first outlet channel is smaller than the diameter of the second outlet channel. This facilitates liquid flow toward the second outlet channel.

[0164] (G) In the filter unit described in (E), when the filter is set as a first filter, the filter unit may 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 uppermost part of the filter front chamber, and the second filter being arranged in the bypass flow path.

[0165] According to this configuration, the same effects as those of the above-described filter unit can be achieved.

[0166] (H) In the filter unit described in (E), when the filter is set as a first filter, the filter unit may include: a converging flow path connected to the downstream connecting portion; a bypass flow path connected to the bypass port located at the uppermost part of the filter front chamber; and a second filter arranged in the bypass flow path, the first outlet flow path, the second outlet flow path, and the bypass flow path merge with the converging flow path, and the converging flow path has the largest diameter among the respective diameters of the first outlet flow path, the second outlet flow path, the bypass flow path, and the converging flow path.

[0167] According to this configuration, the diameter of the merging flow path is larger than the diameters of the first outlet flow path, the second outlet flow path, and the bypass flow path, thereby effectively mixing the liquids sent from the first outlet flow path, the second outlet flow path, and the bypass flow path.

[0168] (I) In the filter unit described in (A) to (H), the filter front chamber may include a plurality of ribs provided on the bottom surface.

[0169] According to this configuration, the filter front chamber has ribs provided on the bottom surface. The ribs block the flow of the liquid introduced into the filter front chamber. In other words, the ribs disrupt the flow of the liquid, thereby stirring the liquid.

[0170] (J) In the filter unit described in (A) to (I), the filter front chamber may have a plurality of ribs provided on a side surface.

[0171] According to this configuration, the filter front chamber has ribs provided on the side surfaces. The ribs block the flow of the liquid introduced into the filter front chamber. In other words, the ribs disrupt the flow of the liquid, thereby stirring the liquid.

[0172] (K) A liquid flow device comprising: the filter unit described in (A) to (J); the upstream connecting portion; the downstream connecting portion; an upstream flow path connected to the upstream connecting portion; and a downstream flow path connected to the downstream connecting portion.

[0173] According to this configuration, the same effects as those of the above-described filter unit can be achieved.

[0174] (L) A liquid ejection device includes: the liquid flow device described in (K); and a liquid ejection portion capable of ejecting liquid.

[0175] According to this configuration, the same effects as those of the above-described filter unit can be achieved.

Claims

1. A filter unit, characterized in that: The filter unit is detachable from an upstream connection portion and a downstream connection portion, wherein the downstream connection portion is located vertically above the upstream connection portion, and includes: Filter, to filter liquid; a filter chamber comprising a filter front chamber and a filter rear chamber divided by the filter; An introduction flow path for introducing liquid into the filter front chamber via an introduction port; as well as The outlet channel is configured to outlet the liquid from the filter rear chamber via the outlet port. In the posture of being installed on the upstream connection part and the downstream connection part, The inlet is located at the bottom of the filter front chamber. The outlet is located at the uppermost part of the filter rear chamber. The bottom surface of the filter front chamber is inclined upward from the position of the introduction port.

2. The filter unit according to claim 1, characterized in that The filter front chamber is located below the upper end of the filter.

3. The filter unit according to claim 1, characterized in that When the filter is set as the first filter, The filter unit comprises: a second filter; and A bypass flow path connects the filter front chamber to the outlet flow path, The bypass flow path is connected to the bypass port located at the uppermost part of the filter front chamber. The second filter is provided in the bypass flow path.

4. The filter unit according to claim 1, characterized in that The filter chamber has a partition wall that divides the filter front chamber and the filter rear chamber. The partition wall is provided so as to be inclined with respect to the vertical direction so that the space above the filter front chamber is smaller than the space below the filter front chamber. The filter is arranged at the opening of the partition wall.

5. The filter unit according to claim 1, wherein When the lead-out port is set as the first lead-out port and the lead-out flow path is set as the first lead-out flow path, The filter unit includes a second outlet flow path for outlet liquid from the filter rear chamber. The second outlet flow path allows liquid, which is discharged from the filter rear chamber via a second outlet port provided at the lowermost portion of the filter rear chamber, to merge with the first outlet flow path.

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

7. The filter unit according to claim 5, characterized in that When the filter is set as the first filter, The filter unit comprises: Second filter; as well as A bypass flow path connects the filter front chamber to the first outlet flow path, The bypass flow path is connected to the bypass port located at the uppermost part of the filter front chamber. The second filter is provided in the bypass flow path.

8. The filter unit according to claim 5, characterized in that When the filter is set as the first filter, The filter unit comprises: a confluent flow path connected to the downstream connecting portion; a bypass flow path connected to the bypass port located at the uppermost portion of the filter antechamber; and The second filter is provided in the bypass flow path, The first outlet flow path, the second outlet flow path, and the bypass flow path merge with the merging flow path. Among the diameters of the first outlet flow path, the second outlet flow path, the bypass flow path, and the merging flow path, the merging flow path has the largest diameter.

9. The filter unit according to claim 1, characterized in that 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 the side.

11. A liquid flow device, characterized in that: have: The 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; and The downstream flow path is connected to the downstream connection portion.

12. A liquid ejection device, characterized in that: have: The liquid flow device of claim 11; and The liquid ejection portion is capable of ejecting liquid.

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