Zoned control jetting arrayed fluidic jet

Abstract

The present application belongs to the technical field of inkjet printing equipment, and discloses an arrayed electro-fluidic jet head for partition control jetting, which comprises a jet head top plate, a jet head assembly and a jet head bottom plate assembled together from top to bottom, wherein the jet head assembly comprises at least two groups of jet head arrays arranged side by side and capable of being independently controlled; each jet head array is provided with an ink inlet, a capillary nozzle and an ink outlet connected in sequence, and the jet head bottom plate is provided with an ink outlet hole, and the ink ejection end of each capillary nozzle is arranged in the corresponding ink outlet hole to isolate the electric field interference between the jet head arrays; during operation, the ink is controlled to flow into the ink inlet of the selected jet head array, part of the ink flows out through the corresponding capillary nozzle and the ink outlet hole, and the other part of the ink flows back to the ink storage place through the corresponding ink outlet.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of inkjet printing equipment, and more particularly relates to an arrayed electrofluidic printhead with partitioned control of ejection. BACKGROUND

[0002] In recent years, inkjet printing technology has been applied in the field of flexible devices such as OLED, RFID, thin-film solar cell, etc. The flexible electronic manufacturing process combining flexible electronics and inkjet printing has also attracted more attention. The traditional inkjet printing technology represented by piezoelectric / thermal bubble uses extrusion force as the ejection power, making the inkjet printing very sensitive to the viscosity of the ink, generally using an ink with a viscosity range of less than 20 cp, and the ejected ink droplet is generally larger than the diameter of the ink inlet hole, resulting in low printing resolution. The electrofluidic inkjet printing technology uses electric field as the driving force. Under the action of electric field, the liquid is "pulled" out by the electric field. The viscosity of the ink can reach 10,000 cp, and the ejected ink droplet is much smaller than the diameter of the nozzle. Therefore, the electrofluidic inkjet printing technology has a great application prospect. In order to further improve the efficiency and application scenarios of electrofluidic inkjet printing, it is necessary to develop an electrofluidic printhead with partitioned control of ejection.

[0003] For example, patent CN201410289239.5 proposes to realize independent control of the printhead by adding a front extraction electrode, but the ink droplets are easy to splash onto the extraction electrode, and the ejection often fails. Patent CN113799491A proposes a kind of electrofluidic printhead without extraction electrode, which realizes independent control of the printhead through a voltage dividing unit, but the electric field crosstalk of each nozzle is large, the printing droplets are easy to deviate, and the inkjet precision is poor. SUMMARY

[0004] In view of the defects of the prior art, the purpose of the present application is to provide an arrayed electrofluidic printhead with partitioned control of ejection to solve the above problems.

[0005] The present application provides an arrayed electrofluidic printhead with partitioned control of ejection, which comprises a printhead top plate, a printhead assembly and a printhead bottom plate assembled together from top to bottom. The printhead assembly comprises at least two groups of side-by-side arranged and independently controllable printhead arrays. Each printhead array is provided with an ink inlet, a capillary nozzle and an ink outlet connected in sequence. The printhead bottom plate is provided with an ink outlet hole. Each capillary nozzle is arranged in the corresponding ink outlet hole to isolate the electric field interference between the printhead arrays. During operation, the ink flows into the ink inlet of the selected printhead array, part of the ink is ejected through the corresponding capillary nozzle and out of the ink outlet hole, and the other part of the ink flows back to the ink storage place through the corresponding ink outlet.

[0006] Further, the inkjet head array comprises a head cover plate and a base, the head cover plate is assembled on the base, the ink inlet and the ink outlet are arranged on the head cover plate; the upper end of the capillary nozzle is arranged in the base and communicates with the ink inlet and the ink outlet, the lower end of the capillary nozzle is arranged in the ink outlet hole; preferably, the head cover plate, the head base and the base are made of corrosion-resistant insulating material.

[0007] Further, the ink inlet and the capillary nozzle and the ink outlet and the capillary nozzle are both provided with a filter structure; preferably, the filter structure is made of corrosion-resistant insulating material.

[0008] Further, the upper surface of the base is also provided with a micro flow channel, the micro flow channel communicates with the ink inlet and the ink outlet respectively, and the upper end of the capillary nozzle communicates with the micro flow channel; preferably, a filter screen is arranged on the micro flow channel, the filter screen is used for filtering the ink entering from the ink inlet and the ink flowing out from the ink outlet; more preferably, the flow channel between the inlet and the outlet of the micro flow channel is divided into at least two flow paths, and a control valve is arranged at the inlet of the micro flow channel, and a one-way stop valve is arranged at the outlet of the micro flow channel.

[0009] Further, the bottom surface of the micro flow channel is provided with an ink inlet hole penetrating upward and downward, the ink inlet hole communicates with the ink inlet and the ink outlet, and the upper end of the capillary nozzle is arranged in the ink inlet hole; preferably, a heating element is further arranged in the micro flow channel, the heating element is used for heating the ink in the micro flow channel before flowing into the capillary nozzle.

[0010] Further, a sealing element is arranged between the base and the head cover plate to prevent ink leakage; preferably, a sealing cavity is further arranged on the upper surface of the base, the micro flow channel is arranged at the center of the bottom surface of the sealing cavity, and the sealing element is arranged at the periphery of the center of the bottom surface of the sealing cavity.

[0011] Further, the capillary nozzle is in interference fit with the ink outlet hole; preferably, the joint between the capillary nozzle and the ink outlet hole is sealed after the interference fit.

[0012] Further, a threading hole is arranged on the side surface of the head base, the threading hole is used to provide high-voltage electricity for the capillary nozzle.

[0013] Further, the ink outlet hole is coated with a super-hydrophobic coating, the super-hydrophobic coating is used to prevent the ink from gathering when being sprayed out of the ink outlet hole to affect the electro-fluidic jet; preferably, the super-hydrophobic coating is a silicon-based coating; more preferably, the outer surface of the capillary nozzle is also coated with the same coating as the super-hydrophobic coating.

[0014] Further, the capillary nozzles in each jet array comprise at least 128, and all the capillary nozzles are arranged in rows; preferably, the outer layer of the capillary nozzles is coated with a corrosion-resistant insulating material, and the tube core of the capillary nozzles is preferably made of a conductive metal material; more preferably, two adjacent rows of capillary nozzles in adjacent two jet arrays are arranged in parallel; more preferably, all the capillary nozzles are staggered and do not overlap in the direction perpendicular to the arrangement direction of each row of capillary nozzles.

[0015] Compared with the prior art, the above technical scheme of the present application mainly has the following advantages:

[0016] 1. The jet assembly of the present application comprises a plurality of jet arrays, and the arrayed arrangement of the electrowetting jet arrays can independently control the nozzles thereof, thereby improving the dpi capability (dpi means the number of dots per inch) of the jet, and the independent control of the jet arrays can improve the jet printing efficiency; and the ink outlet end of each capillary nozzle in each jet array is arranged in the ink outlet hole of the jet base plate, and the ink outlet hole can isolate the electric field disturbance between the capillary nozzles, thereby making the electric field between each jet assembly independent and not affecting each other; when the ink flows in the jet assembly of the present application, a part of the ink flows into the corresponding capillary nozzle and is sprayed from the ink outlet hole, and the other part of the ink flows back to the ink storage from the corresponding ink outlet, and the circulation of the ink makes the ink supply of each nozzle uniform and prevents the ink from depositing in the ink flow path.

[0017] 2. In the electrowetting jet of the present application, a filter structure is further arranged in each jet assembly for filtering impurities and bubbles in the ink, and the filter structure is made of a corrosion-resistant insulating material, which can prevent the ink from being contaminated; and a micro flow channel comprising a plurality of branches is further arranged between the inlet and outlet of the base, and the filtered ink flows in each branch of the micro flow channel, which can further eliminate the bubbles in the ink and prevent the ink from depositing.

[0018] 3. In the electrowetting jet of the present application, the jet base plate and the base of each jet array of the electrowetting jet are made of a corrosion-resistant insulating material, so that the electric field between each jet array is not affected by the electric field interference of each other, thereby realizing the electric field independence of the area where each jet array is located; in addition, the bottom of the jet base plate is coated with a silicon-based hydrophobic coating, which is distributed around the rows of capillary nozzles, thereby further enhancing the stability of inkjet.

[0019] 4、The electrofluidic nozzle structure of the present application is compact, and each nozzle array in the nozzle assembly is a separate inkjet module, which can be freely disassembled and replaced after assembly, and the capillary nozzles on the nozzle array are arranged in the ink inlet holes of the nozzle base and the ink outlet holes of the nozzle bottom plate, and each capillary nozzle can also be disassembled individually to replace the capillary nozzle when the ink inlet hole is blocked, so that the maintenance cost of the present application is lower.

[0020] 5. There are at least 128 capillary hole nozzles in each nozzle assembly of the present application, and all the capillary hole nozzles are arranged longitudinally in rows, and the more the number of rows is set, the smaller the pinhole spacing is, and the larger the printed area is swept. The longitudinal rows of capillary nozzles in the adjacent two nozzle assemblies are arranged horizontally, and the multiple nozzle assemblies include multiple rows of nozzle arrays, and all the capillary nozzles are staggered and not overlapped in the direction perpendicular to the single row of capillary nozzles, further increasing the dpi capability of the arrayed electrofluidic nozzle. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a three-dimensional view of the arrayed electrofluidic nozzle for zone control spraying in an embodiment of the present application;

[0022] Figure 2 is a schematic view of the nozzle top plate of the arrayed electrofluidic nozzle for zone control spraying in an embodiment of the present application;

[0023] Figure 3 is a schematic view of the nozzle cover plate of the arrayed electrofluidic nozzle for zone control spraying in an embodiment of the present application;

[0024] Figure 4 is a schematic view of the base of the arrayed electrofluidic nozzle for zone control spraying in an embodiment of the present application;

[0025] Figure 5 is a schematic view of the nozzle bottom plate of the arrayed electrofluidic nozzle for zone control spraying in an embodiment of the present application;

[0026] Figure 6 is a schematic view of the microfluidic channel structure of the arrayed electrofluidic nozzle for zone control spraying in an embodiment of the present application;

[0027] Figure 7 is a schematic view of the capillary nozzle installation of the arrayed electrofluidic nozzle for zone control spraying in an embodiment of the present application;

[0028] Figure 8 is a schematic view of the ink supply system of the arrayed electrofluidic nozzle for zone control spraying in an embodiment of the present application;

[0029] Figure 9 is a schematic view of the power supply system of the arrayed electrofluidic nozzle for zone control spraying in an embodiment of the present application;

[0030] Figure 10 is the arraying schematic diagram of the capillary nozzle of the arrayed electrofluidic printhead with zoned control of ejection in the embodiment of the present application;

[0031] Figure 11 is the position schematic diagram of the electrofluidic heating sheet with zoned control of ejection in the embodiment of the present application;

[0032] Figure 12 is the arrangement schematic diagram of the capillary nozzle in a single printhead array in the embodiment of the present application.

[0033] In the figure: 1 - printhead top plate, 2 - printhead cover plate, 3 - base, 4 - capillary nozzle, 5 printhead bottom plate, 11 - top plate fixing hole, 12 - top plate positioning hole, 13 - equipment fixing hole, 14 - equipment positioning hole, 21 - ink inlet, 22 - filter screen, 23 - ink outlet, 31 - fixing hole, 32 - positioning hole, 33 - sealing cavity, 34 - micro flow channel, 35 - ink inlet hole, 36 - heating element, 51 - threading hole, 52 - silicon-based super-hydrophobic coating, 53 - ink outlet hole. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application more clear and understandable, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0035] Embodiment 1

[0036] The embodiment discloses an arrayed electrofluidic printhead with zoned control of ejection, which comprises, from top to bottom, a printhead top plate 1, a printhead assembly and a printhead bottom plate 5 assembled in one body, wherein the printhead assembly comprises at least two groups of printhead arrays arranged side by side and independently controlled respectively; each printhead array is provided with an ink inlet 21, a capillary nozzle 4 and an ink outlet 23 connected in sequence; the capillary nozzle 4 in the embodiment comprises at least 128 capillary nozzles, and all the capillary nozzles are arranged in multiple rows, and the two adjacent rows of capillary nozzles are arranged in staggered manner, showing a small array form; and the outer layer of the capillary nozzle 4 is coated with a corrosion-resistant insulating material, and the tube core of the capillary nozzle 4 is made of conductive metal material, and the 316L stainless steel material is selected in the embodiment. The multiple printhead arrays in the embodiment are arranged side by side, and the two adjacent rows of capillary nozzles between the adjacent printhead arrays are arranged in staggered manner, so as to increase the scanning area of the printhead, and thus improve the dpi capability of the arrayed electrofluidic printhead.

[0037] The ink ejection holes 53 are formed in the bottom plate 5 of the inkjet head, and the ink ejection ends of each capillary nozzle 4 are arranged in the corresponding ink ejection holes 53 so that the electric fields of the different inkjet arrays do not interfere with each other. During operation, the ink is controlled to flow into the ink inlet of the selected inkjet array, and a part of the ink flows through the corresponding capillary nozzle and is ejected from the ink ejection hole 53, while the other part of the ink flows back to the ink storage through the corresponding ink ejection hole, so that the ink is circulated to avoid accumulation and improve the utilization rate of the ink.

[0038] In the preferred embodiment, the aforementioned inkjet array comprises an inkjet cover plate 2 and a base 3, the inkjet cover plate 2 is assembled on the base 3, the upper end of the capillary nozzle 4 is arranged in the base 3 and communicates with the ink inlet 21 and the ink outlet 23, the lower end of the capillary nozzle 4 is arranged in the ink ejection hole 53, and the inkjet cover plate 2, the inkjet bottom plate 5 and the base 3 are all made of corrosion-resistant and insulating materials, such as Teflon plastic, to ensure that the electric fields of each inkjet array are independent and do not interfere with each other.

[0039] In the preferred embodiment, the ink inlet 21 and the capillary nozzle 4 and the ink outlet 23 and the capillary nozzle 4 are both provided with a filter structure made of corrosion-resistant and insulating materials, and the filter structure in this embodiment is preferably a filter screen.

[0040] In the preferred embodiment, the upper surface of the base 3 is also provided with a micro-channel 34, the micro-channel 34 communicates with the ink inlet 21 and the ink outlet 23, and the upper end of the capillary nozzle 4 communicates with the micro-channel 34; the aforementioned filter screen is arranged above the micro-channel, and the filter screen can filter the ink entering from the ink inlet 21 and the ink flowing out from the ink outlet 23 to remove impurities and bubbles; and the flow channel between the inlet and the outlet of the micro-channel 34 is divided into at least two flow paths, and a control valve is arranged at the inlet of the micro-channel 34 and a one-way stop valve is arranged at the outlet of the micro-channel 34 to adjust the flow of the ink.

[0041] In the preferred embodiment, the bottom surface of the aforementioned micro-channel 34 is provided with an ink inlet hole 35 that penetrates up and down, the ink inlet hole 35 communicates with the ink inlet 21 and the ink outlet 23, and the upper end of the capillary nozzle 4 is arranged in the ink inlet hole 35 for easy replacement; a heating element can also be arranged in the micro-channel 34, which can heat the ink in the micro-channel 34 before flowing into the capillary nozzle 4 when the ink needs to be heated in some printing situations.

[0042] In the preferred embodiment, a sealing element is arranged between the base 3 and the inkjet cover plate 2 to prevent ink leakage; the upper surface of the aforementioned base 3 is also provided with a sealing cavity 33, and the micro-channel 34 is arranged at the center of the bottom surface of the sealing cavity 33; the sealing element is preferably an O-shaped sealing ring, which is arranged at the periphery of the center of the bottom surface of the sealing cavity, and the micro-channel is arranged in the middle of the sealing ring to provide sufficient space for the ink to flow, and the sealing effect of the sealing element prevents leakage between the base 3 and the inkjet cover plate 2.

[0043] In a preferred embodiment, the capillary nozzle 4 and the ink outlet 53 can also be interference-fitted to ensure a more stable assembly, guarantee installation accuracy, and ensure that high voltage is distributed to the capillary nozzle; after the capillary nozzle 4 and the ink outlet 53 are interference-fitted, the joint between them is sealed with sealant.

[0044] In a preferred embodiment, a wire hole 51 is also provided on the side of the nozzle base plate 5, which is used to provide high voltage to the capillary nozzle 4.

[0045] In a preferred embodiment, a silicon-based superhydrophobic coating 52 is coated around the ink outlet 53. The superhydrophobic coating 52 is used to prevent ink from pooling when it is ejected from the ink outlet 53, which would affect the electrostatic spraying. The outer surface of the capillary nozzle 4 is also coated with the same coating as the superhydrophobic coating 52.

[0046] Example 2

[0047] Figure 1 As shown in the figure, this embodiment proposes an arrayed electrohydrodynamic nozzle with zoned control spraying. The nozzle includes, from top to bottom, a nozzle top plate 1, a nozzle assembly, and a nozzle bottom plate 5, which are fixed together by screws. The nozzle assembly includes four sets of nozzle arrays arranged side by side and staggered, and each is independently controlled.

[0048] like Figures 2-5 As shown, the nozzle array includes a nozzle cover plate 2 and a base 3. The base 3 has a positioning hole 32 and a fixing hole 31. The nozzle top plate 1 has a top plate positioning hole 12 corresponding to the positioning hole 32 and a top plate fixing hole 11 corresponding to the fixing hole 31. It also has a device fixing hole 13 for installing the arrayed electro-hydraulic nozzles provided in this embodiment onto the application equipment and a device positioning hole 14 for positioning the arrayed electro-hydraulic nozzles. The nozzle cover plate 2 has through holes corresponding to the top plate positioning hole 12 and the top plate fixing hole 11 on the nozzle top plate 1. After the positioning hole 2 and the corresponding through hole are aligned with the top plate positioning hole 12, bolts are inserted for fixing. After the fixing hole 31 and the corresponding through hole are aligned with the top plate fixing hole 11, bolts are also inserted for fixing, thereby fixing the base 3, the nozzle cover plate 2 and the nozzle top plate 1 into one unit.

[0049] The printhead cover 2 is provided with an ink inlet 21 and an ink outlet 23 connected in sequence; the printhead cover 2 is mounted on the base 3; as Figure 4 As shown, a microchannel 34 is also provided at the center of the upper surface of the base 3. A vertically penetrating ink inlet 35 is provided at the center of the bottom surface of the microchannel 34. The ink inlet 35 is connected to both the ink inlet 21 and the ink outlet 23. The capillary nozzle 4 is a stainless steel capillary nozzle with a diameter of 200 μm and an inner diameter of 80 μm. Figure 7As shown, the capillary nozzles 4 are inserted into the ink inlet holes 35 by thermal expansion and contraction method to ensure that all nozzle ends are in the same plane and are firmly and compactly installed. The ink outlet holes 53 are formed on the nozzle base plate 5, and the lower ink ejection end of each capillary nozzle 4 is inserted into the corresponding ink outlet hole 53 by thermal expansion and contraction method.

[0050] The number of capillary nozzles 4 in this embodiment is 128, and the corresponding ink inlet holes 35 and ink outlet holes 53 are also 128, and all capillary nozzles are arranged in rows, showing a multi-row array form, as shown in Figure 10 As shown, the capillary nozzles 4 are inserted into the ink inlet holes 35 by thermal expansion and contraction method to ensure that all nozzle ends are in the same plane and are firmly and compactly installed. The ink outlet holes 53 are formed on the nozzle base plate 5, and the lower ink ejection end of each capillary nozzle 4 is inserted into the corresponding ink outlet hole 53 by thermal expansion and contraction method. Figure 12 As shown, in a single nozzle array, a plurality of capillary nozzles (i.e. circles in the figure) arranged at equal intervals along the x direction form a nozzle row, and a plurality of nozzle rows form a nozzle array (3 rows in the figure), and the capillary nozzles of the nozzle array along the y direction are staggered and do not overlap; the outer layer of the capillary nozzle 4 is also coated with a corrosion-resistant insulating material, and the tube core of the capillary nozzle 4 is made of 316L austenitic stainless steel, which can achieve better printing effect.

[0051] In this embodiment, the ink outlet holes 53 are coated with a silicon-based super-hydrophobic coating 52, which is used to prevent the ink from converging when it is ejected from the ink outlet holes 53 to affect the electrofluidic ejection; the outer surface of the capillary nozzle 4 is also coated with the same coating as the super-hydrophobic coating 52. The ink outlet holes 53 and the ink inlet holes 35 are machined by precision CNC machining technology, the diameter of the ink outlet holes 53 is 200 μm, and the diameter of the ink inlet holes 35 is also 200 μm, which can be slightly larger than the capillary nozzle and the spacing between adjacent ink outlet holes and the spacing between adjacent ink inlet holes are both 1.016 mm.

[0052] As shown in Figure 6 The outer shape of the micro-channel 34 in this embodiment is rectangular, the flow channel between the inlet and outlet of the micro-channel 34 is divided into a plurality of branch flow paths, and a control valve is arranged at the inlet of the micro-channel 34, and a one-way check valve (not shown in the figure) is arranged at the outlet thereof for adjusting the ink flow. As shown in Figure 11As shown, the micro flow channel 34 is provided with a heating element 36, the heating element 36 is symmetrically provided with two, each heating element abuts the micro flow channel side wall, and the heating element bottom surface does not block the entrance of the capillary nozzle, when the ink needs to be heated in some printing cases, the heating element can heat the ink in the micro flow channel 34 before flowing into the capillary nozzle 4; The filter screen is laid above the micro flow channel 34, and the filter screen can filter the ink entering from the ink inlet 21 and the ink flowing out from the ink outlet 23, and remove impurities and bubbles therefrom;

[0053] The nozzle cover plate 2, the nozzle bottom plate 5 and the base 3 are all made of Teflon plastic material, so as to ensure that the electric field between each nozzle array is independent and does not interfere with each other.

[0054] As shown in the drawings, Figure 4 The upper surface of the base 3 is also provided with a sealed cavity 33, and the micro flow channel 34 is arranged at the bottom center of the sealed cavity 33. The base 3 and the nozzle cover plate 2 are further provided with a rectangular sealing ring, which is arranged at the bottom center of the sealed cavity. The micro flow channel is arranged in the sealing ring, so that the ink has enough flow space, and the sealing effect of the sealing element avoids leakage between the base 3 and the nozzle cover plate 2.

[0055] As shown in the drawings, Figure 5 The side surface of the nozzle bottom plate 5 is also provided with a threading hole 51, which is used to provide high-voltage electricity for the capillary nozzle 4.

[0056] In operation, referring to Figure 8 and Figure 9 , the ink is injected into the staggered nozzle array, and each ink path is independently controllable. The ink passes through the filter screen and enters the micro flow channel. The flow rate and pressure of the ink in the micro flow channel are relatively uniform. One way of ink is sprayed from the ink outlet hole 53 of the capillary nozzle for printing, and the flow rate of the ink in each capillary nozzle is uniform. The other way of ink is filtered and then flows into the ink supply barrel from the ink outlet. In this way, the multi-partition independent control of the arrayed electrofluidic nozzle can be realized.

[0057] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An arrayed fluid ejection head with zoned control of ejection, characterized by, The nozzle comprises a nozzle top plate (1), a nozzle assembly and a nozzle bottom plate (5) assembled together from top to bottom, wherein the nozzle assembly comprises at least two groups of nozzle arrays arranged side by side and controlled independently; each nozzle array comprises a nozzle cover plate (2) and a base (3), and is further provided with an ink inlet (21), a capillary nozzle (4) and an ink outlet (23) connected in sequence, all the capillary nozzles are arranged in rows, and adjacent two nozzles in each row of each nozzle array are arranged at equal intervals; the nozzle cover plate (2) is assembled on the base (3), the ink inlet (21) and the ink outlet (23) are arranged on the nozzle cover plate (2); the upper end of the capillary nozzle (4) is arranged in the base (3) and communicates with the ink inlet (21) and the ink outlet (23); the nozzle bottom plate (5) is provided with an ink outlet hole (53), the lower end of each capillary nozzle (4) is arranged in the corresponding ink outlet hole (53) for isolating the electric field interference between the arrays, and the two are in interference fit; the periphery of the ink outlet hole (53) and the outer surface of the capillary nozzle (4) are coated with a super-hydrophobic coating (52), the super-hydrophobic coating (52) is used to prevent the ink from gathering when being sprayed out of the ink outlet hole (53) to affect the electrofluidic jet; the side surface of the nozzle bottom plate (5) is further provided with a threading hole (51), the threading hole (51) is used to provide high-voltage electricity for the capillary nozzle (4); the two rows of capillary nozzles adjacent to each other in the adjacent two nozzle arrays are arranged in parallel, all the capillary nozzles are arranged in staggered and non-overlapping manner along the arrangement direction perpendicular to each row of capillary nozzles; during operation, the ink is controlled to flow from the ink inlet of the selected nozzle array, a part of the ink flows through the corresponding capillary nozzle and is sprayed out of the ink outlet hole (53), and the other part of the ink flows back to the ink storage place from the corresponding ink outlet.

2. The arrayed fluid ejection head with zoned control of ejection as defined in claim 1, wherein, The nozzle cover plate (2), the nozzle bottom plate (5) and the base (3) are made of corrosion-resistant insulating material.

3. The arrayed fluid ejection head of any of claims 1-2, wherein, The filter structure is made of corrosion-resistant insulating material.

4. The arrayed fluid ejection head of claim 2 wherein, The upper surface of the base (3) is further provided with a micro flow channel (34), the micro flow channel (34) communicates with the ink inlet (21) and the ink outlet (23) respectively, and the upper end of the capillary nozzle (4) communicates with the micro flow channel (34); the micro flow channel is paved with a filter screen, the filter screen is used to filter the ink entering from the ink inlet (21) and the ink to be flowed out of the ink outlet (23); the flow channel between the inlet and the outlet of the micro flow channel (34) is divided into at least two flow paths, and a control valve is arranged at the inlet of the micro flow channel (34) and a one-way stop valve is arranged at the outlet thereof.

5. The arrayed fluid ejection head of claim 4 wherein, The bottom surface of the micro flow channel (34) is provided with an ink inlet hole (35) penetrating from top to bottom, the ink inlet hole (35) is communicated with the ink inlet (21) and the ink outlet (23), and the upper end of the capillary nozzle (4) is arranged in the ink inlet hole (35); the micro flow channel (34) is further provided with a heating element, which is used for heating the ink in the micro flow channel (34) before flowing into the capillary nozzle (4).

6. The arrayed fluid ejection head of claim 4 wherein, A sealing element is further arranged between the base (3) and the nozzle cover plate (2) to prevent ink leakage; the upper surface of the base (3) is further provided with a sealing cavity (33), the micro flow channel (34) is arranged at the center of the bottom surface of the sealing cavity (33), and the sealing element is arranged at the periphery of the center of the bottom surface of the sealing cavity.

7. The arrayed fluid ejection head of claim 1 wherein, The capillary nozzle (4) and the ink outlet hole (53) are in interference fit, and the joint between the two is sealed.

8. The arrayed fluid ejection head of claim 1 wherein, The super-hydrophobic coating (52) is a silicon-based coating.

9. The arrayed fluid ejection head of claim 1 wherein, The capillary nozzle (4) in each nozzle array includes at least 128; the outer layer of the capillary nozzle (4) is coated with a corrosion-resistant insulating material, and the tube core of the capillary nozzle (4) is made of a conductive metal material.

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