Self-cleaning spray head and printing equipment

Abstract

The embodiment of the utility model provides a self-cleaning spray head and printing equipment. The self-cleaning spray head comprises a spray head main body, the nozzle main body is provided with a liquid spraying surface, and spraying holes are formed in the liquid spraying surface; a hydrophobic structure is arranged on the surface of the liquid spraying surface; the hydrophobic structure at least covers the peripheral area of the spray hole; the hydrophobic structure is a micron-scale hydrophobic structure or a nano-scale hydrophobic structure. According to the self-cleaning spray head, the situation that liquid adheres to the liquid spraying face is reduced, the spray holes are prevented from being blocked, printed media are prevented from being polluted, and therefore the cleaning and maintaining cost of equipment is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of printing, in particular to a self-cleaning nozzle and a printing device. Background Art

[0002] A printing device has a nozzle, and the liquid spraying surface of the nozzle has a plurality of spray holes. In the traditional nozzle, during the use process, the liquid often adheres to the liquid spraying surface, resulting in the blockage of the spray holes and the pollution of the printed medium, and the cost of cleaning and maintaining the cleanliness of the device is relatively high. Summary of the Utility Model

[0003] The purpose of the embodiments of the utility model is to provide a self-cleaning nozzle and a printing device to avoid the blockage of the spray holes during use, thereby reducing the cost of cleaning and maintaining the cleanliness of the device. The specific technical solutions are as follows:

[0004] An embodiment of the first aspect of the present application proposes a self-cleaning nozzle, which includes a nozzle body; the nozzle body has a liquid spraying surface, and spray holes are arranged on the liquid spraying surface; a hydrophobic structure is arranged on the surface of the liquid spraying surface; the hydrophobic structure at least covers the surrounding area of the spray holes; the hydrophobic structure is a micron-level hydrophobic structure or a nano-level hydrophobic structure.

[0005] In some embodiments of the present application, the hydrophobic structure includes a plurality of laid grooves.

[0006] In some embodiments of the present application, the numerical range of the width of the groove is 1 nm - 1 μm;

[0007] The distance between two adjacent grooves is 1 μm - 5 μm.

[0008] In some embodiments of the present application, the hydrophobic structure includes a laid concave-convex array structure.

[0009] In some embodiments of the present application, the liquid spraying surface has a flow guiding structure;

[0010] The flow guiding structure is arranged between the spray holes;

[0011] The flow guiding structure forms a convex structure converging in the liquid spraying direction and / or a concave structure diverging in the liquid spraying direction.

[0012] In some embodiments of the present application, the inner diameter of the spray hole gradually increases in the liquid spraying direction towards the position close to the liquid spraying surface, forming a conical flaring that expands outwards.

[0013] In some embodiments of the present application, the axis of the conical flaring is coaxially arranged with the axis of the spray hole.

[0014] In some embodiments of the present application, the self-cleaning nozzle further includes: a hydrophobic coating;

[0015] The surface of the liquid spraying surface and / or the hydrophobic structure is covered with the hydrophobic coating.

[0016] In some embodiments of the present application, the self-cleaning nozzle further includes: a hydrophobic coating; the surface of the liquid spraying surface and / or the hydrophobic structure is covered with the hydrophobic coating;

[0017] The hydrophobic coating has nanoparticles, and the diameter of the nanoparticles is smaller than the inner diameter of the groove and smaller than the depth of the groove.

[0018] An embodiment of the second aspect of the present application provides a printing device, and the printing device includes the self-cleaning nozzle of any embodiment of the first aspect.

[0019] Beneficial effects:

[0020] The present application reduces the occurrence of liquid adhering to the liquid spraying surface, avoids clogging of the spray holes and contamination of the printed medium, thereby reducing the cleaning and maintenance cost of the device.

[0021] Of course, it is not necessary for any product implementing the present utility model to achieve all the above-mentioned advantages simultaneously. Description of the Drawings

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model, and those of ordinary skill in the art can also obtain other drawings based on these drawings.

[0023] Figure 1 Schematic exploded view of the self-cleaning nozzle according to the first embodiment of the present application;

[0024] Figure 2 Schematic diagram of the positional relationship between the hydrophobic structure and the spray holes in the first embodiment of the present application;

[0025] Figure 3 For Figure 1 A-A cross-sectional view of the spray hole plate in

[0026] Figure 4 For Figure 3 Local enlarged view of M in

[0027] Figure 5 Cross-sectional view of the spray hole plate of the self-cleaning nozzle according to the second embodiment of the present application;

[0028] Figure 6 Cross-sectional view of the spray hole plate of the self-cleaning nozzle according to the third embodiment of the present application;

[0029] Figure 7 is Figure 6 a partial enlarged schematic view at N positions of

[0030] Figure 8 a schematic exploded view of the self - cleaning nozzle of the fourth embodiment of the present application;

[0031] Figure 9 is Figure 8 a B - B cross - sectional view of the nozzle plate in

[0032] Figure 10 a cross - sectional view of the nozzle plate of the self - cleaning nozzle of the fifth embodiment of the present application;

[0033] Figure 11 a flowchart of the preparation method of the nozzle plate of the self - cleaning nozzle of the embodiment of the present application.

[0034] Description of reference numerals:

[0035] Fluid 10; main droplet 11; satellite point 12; nozzle body 20; main body part 100; liquid outlet channel 110; accommodation groove 120; nozzle plate 200; first plate 201; first through - hole 2011; second plate 202; second through - hole 2021; nozzle hole 210; liquid spraying surface 220; hydrophobic structure 230; convex structure 240; groove 250; diversion structure 260; first part 261; second part 262; hydrophobic coating 300; cover plate 400; liquid inlet hole 410. Detailed implementation manners

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art based on this application belong to the scope of protection of the present invention.

[0037] The material of the liquid spraying surface of the traditional nozzle has a certain hydrophilicity. The overflow, satellite points, etc. generated by spraying from the nozzle holes will adhere to the liquid spraying surface, resulting in oblique spraying around the nozzle holes. Moreover, as time goes by, the water in the surrounding of the nozzle holes volatilizes, and solid substances adhere to the surrounding of the nozzle holes, which will cause the nozzle holes to be blocked and contaminate the printed medium, and the cost of cleaning and maintaining the equipment is relatively high. To solve the above - mentioned technical problems, the embodiments of the present application propose a self - cleaning nozzle and a printing device.

[0038] As Figure 1 and Figure 2 shown, Figure 1 is a schematic exploded view of the self - cleaning nozzle of the first embodiment of the present application,Figure 2 This is a positional relationship diagram of the hydrophobic structure 230 and the nozzle hole 210 in the first embodiment of the present application. An embodiment of the first aspect of the present application provides a self-cleaning nozzle head, which includes a nozzle head body 20. Specifically, the nozzle head body 20 has a liquid spraying surface 220, and nozzle holes 210 are provided on the liquid spraying surface 220; a hydrophobic structure 230 is arranged on the surface of the liquid spraying surface 220; the hydrophobic structure 230 at least covers the surrounding area of the nozzle holes 210; the hydrophobic structure 230 is a micro-scale hydrophobic structure or a nano-scale hydrophobic structure. Among them, the nozzle head body 20 can be an integrally formed nozzle head body or can be formed by encapsulating a nozzle hole plate 200 and a cavity.

[0039] As Figure 2 shown, the hydrophobic structure 230 can be arranged around the nozzle holes 210.

[0040] The self-cleaning nozzle head of the embodiment of the present application includes a nozzle head body 20, the nozzle head body 20 has a liquid spraying surface 220, nozzle holes 210 are provided on the liquid spraying surface 220, a hydrophobic structure 230 is arranged on the surface of the liquid spraying surface 220, the hydrophobic structure 230 at least covers the surrounding area of the nozzle holes 210, and the hydrophobic structure 230 is a micro-scale hydrophobic structure or a nano-scale hydrophobic structure, so that after a fluid 10 or a processing liquid and other liquids are ejected from the nozzle holes 210, they will not spread on the liquid spraying surface 220, reducing the occurrence of the situation where the fluid 10 or the processing liquid and other liquids adhere to the liquid spraying surface 220, thereby avoiding clogging of the nozzle holes 210 and contamination of the printed medium, and thus reducing the cleaning and maintenance cost of the equipment.

[0041] It can be understood that a nano-scale hydrophobic structure refers to a structure whose own size is in the nano-scale, and a micro-scale hydrophobic structure refers to a structure whose own size is in the micro-scale.

[0042] In the first embodiment of the present application, as Figure 3 and Figure 4 shown, Figure 3 is Figure 1 the A-A cross-sectional view of the nozzle hole plate 200 in Figure 4 is Figure 3Schematic diagram of partial enlargement at M, the hydrophobic structure 230 includes a plurality of laid grooves 250. The grooves 250 extend from the liquid spraying surface 220 towards the inside of the self-cleaning nozzle along the first direction; that is, the micro-scale hydrophobic structure is a micro-groove, and the nano-scale hydrophobic structure is a nano-groove, with a simple structure and convenient for processing; the superhydrophobic effect is achieved by combining the air in the grooves 250 and the surface tension of the fluid 10 itself, making the fluid 10 form a large contact angle on the liquid spraying surface 220, reducing the occurrence of the fluid 10 adhering to the liquid spraying surface 220, thereby improving the spraying quality and printing accuracy. At the same time, the design of the grooves 250 enables the fluid 10 to form a water droplet shape on the liquid spraying surface 220, and uses the rolling and self-cleaning effects of the water droplets to take away the residual fluid 10, thereby keeping the self-cleaning nozzle clean and extending its service life. In addition, since the hydrophobic structure 230 achieves the hydrophobic effect by utilizing the structural characteristics of the liquid spraying surface 220 itself rather than by using a coating method, the hydrophobic effect will not weaken over time, thus ensuring the reliability of the performance.

[0043] Optionally, as Figure 4 shown, the groove 250 can be a columnar groove. In some other embodiments of the present application, the groove 250 can also be a conical groove, or can be a groove 250 of other shapes, and the present application does not make any limitations in this regard.

[0044] In the first embodiment of the present application, the numerical range of the width of the groove 250 is 1 nm - 1 μm; the distance between two adjacent grooves 250 is 1 μm - 5 μm. It can be understood that the width of the groove 250 refers to the minimum dimension of the two opposite sides of the groove opening of the groove 250; when the groove 250 is a columnar groove, its width refers to the diameter of the column. The distance between two adjacent grooves 250 refers to the distance between the edges of the groove openings of two adjacent grooves 250. Setting it within the above numerical range can achieve a better hydrophobic effect.

[0045] The hydrophobic structure 230 includes a laid concave-convex array structure. Optionally, the concave-convex array structure can be an array mesh, a quantum dot array, a wire array, an array groove, and a trench, etc. Among them, the array mesh is a nano-scale structure in the form of a mesh formed on the surface through photolithography or nanoimprinting technology, which is suitable for strengthening the structural strength of the surface. The quantum dot array refers to an ordered array of quantum dots created on the surface through chemical vapor deposition, molecular beam epitaxy, or solution method. The wire array refers to growing vertically or parallel-aligned micro-nano wires on a substrate using chemical vapor deposition or wet chemical methods. The array groove and the trench refer to manufacturing fine grooves or trenches on the material surface through dry or wet etching technology.

[0046] Preferably, the nano-scale hydrophobic structure is a nano-column or a nano-pit. Specifically, the nano-columns can be formed by methods such as micro-electromechanical lithography, nanoimprinting technology, or anodic oxidation to form a regularly arranged nano-column structure on the surface. The nano-column series is different from other nano-structures due to its unique shape. Each nano-column has a columnar structure at the bottom and a conical tip at the top, which can be used to manufacture superhydrophobic surfaces. The nano-column structure is arranged in an array, that is, the hydrophobic structure 230 can include a laid convex array structure. The heights of the nano-columns arranged in the array can be different, thus forming undulations and presenting a concave-convex array structure. The nano-pits can be manufactured by nano-sphere lithography or plasma etching technology to create regular or irregular nano-scale pits on the surface. The nano-scale pits are arranged in an array, that is, the hydrophobic structure 230 can include a laid concave array structure.

[0047] Similarly, corresponding to the nano-scale hydrophobic structure, the micro-scale hydrophobic structure refers to micro-scale columnar structures, pit structures, mesh structures, etc., which are not limited in this application. It can be seen from this that the hydrophobic structure 230 can include a laid concave-convex array structure.

[0048] In the first embodiment of the present application, the coverage range of the hydrophobic structure 230 covers the setting range of all the spray holes 210. The fluid 10 mainly adheres to the periphery of the spray holes 210. The coverage range of the hydrophobic structure 230 covering the setting range of all the spray holes 210 can prevent the fluid 10 from adhering to the spray surface 220 to the greatest extent, thereby achieving a better printing effect. Optionally, the coverage range of the hydrophobic structure 230 can be as Figure 1 shown at P in the figure. In this way, it is not necessary to prepare the hydrophobic structure 230 on the entire surface of the spray surface 220, which is convenient for processing and conducive to improving production efficiency.

[0049] In the first embodiment of the present application, as Figure 1 shown, the nozzle body 20 includes a main body portion 100 and a nozzle plate 200 fixedly connected; the liquid outlet channel 110 is formed in the main body portion 100; the surface of the nozzle plate 200 away from the main body portion 100 forms a spray surface 220; the spray holes 210 are formed in the nozzle plate 200 and penetrate through the nozzle plate 200; the groove 250 is formed in the nozzle plate 200, and the depth of the groove 250 is less than the thickness of the nozzle plate 200. The spray holes 210 are formed in the nozzle plate 200 and fixedly connected to the main body portion 100, which is convenient for replacement and cleaning; the depth of the groove 250 is less than the thickness of the nozzle plate 200 to prevent the fluid 10 from spraying out from the groove 250 due to the excessive depth of the groove 250.

[0050] As Figure 1In the illustrated embodiment, the first direction, the second direction, and the third direction are perpendicular to each other; the main body 100 has four strip-shaped grooves extending in the first direction, and each strip-shaped groove serves as a liquid outlet channel 110. The strip-shaped groove has a notch facing the nozzle plate 200 and the cover plate 400. The cover plate 400 and the main body 100 are arranged in the second direction. The cover plate 400 and the nozzle plate 200 jointly cover the notch of the strip-shaped groove to form a plurality of cavities. The cover plate 400 is provided with a plurality of liquid inlet holes 410, and the plurality of liquid inlet holes 410 and the plurality of liquid outlet channels 110 are arranged in one-to-one correspondence. The fluid 10 enters the liquid outlet channel 110 from the liquid inlet hole 410 and is ejected through the nozzles 210 of the nozzle plate 200.

[0051] As Figure 3 shown, the nozzle plate 200 may include a first plate 201 and a second plate 202 stacked together, and the second plate 202 is disposed between the first plate 201 and the main body 100; the first plate 201 has a first through hole 2011, and the second plate 202 has a second through hole 2021. The first through hole 2011 and the second through hole 2021 are communicated to form a nozzle 210; wherein, the diameter of the first through hole 2011 may be smaller than the diameter of the second through hole 2021, so as to form a tapered hole, form a pressure difference, and facilitate the ejection of the fluid 10, which may include main droplets 11 and satellite points 12.

[0052] In other embodiments of the present application, the nozzle 210 may also be a cylindrical through hole or a tapered through hole, and the present application does not limit this.

[0053] As Figure 5 shown, Figure 5 is a cross-sectional view of the nozzle plate 200 of the self-cleaning nozzle of the second embodiment of the present application. The difference between the self-cleaning nozzle of the second embodiment of the present application and the self-cleaning nozzle of the first embodiment of the present application lies in whether a hydrophobic coating 300 is provided.

[0054] In the second embodiment of the present application, as Figure 5 shown, the self-cleaning nozzle further includes a hydrophobic coating 300; the surface of the liquid spraying surface 220 is covered with a hydrophobic coating 300; the hydrophobic coating 300 can further improve the hydrophobic effect, improve the stability and durability of the self-cleaning nozzle, and thus improve the printing effect.

[0055] Of course, in some other embodiments of the present application, the surfaces of the liquid spraying surface 220 and the hydrophobic structure 230 may both be covered with a hydrophobic coating 300, or only the surface of the hydrophobic structure 230 may be covered with a hydrophobic coating 300. The present application does not limit this, so as to further improve the hydrophobic effect.

[0056] In the second embodiment of the present application, the hydrophobic coating 300 may have nanoparticles, and the diameter of the nanoparticles is less than the inner diameter of the groove 250 and less than the depth of the groove 250; the hydrophobic coating 300 may also be a coating with hydrophobic groups.

[0057] Preferably, when the particle diameter in the hydrophobic coating 300 is less than the width and depth of the groove 250, the hydrophobic coating 300 is used; when the particle diameter in the hydrophobic coating 300 is greater than the width and depth of the groove 250, the use of the hydrophobic coating 300 is abandoned; in this way, while further improving the hydrophobic effect, it is possible to prevent the blocking of the fluid 10 injection, ensure that the normal injection of the fluid 10 is not affected, and thus ensure the printing quality.

[0058] Optionally, the hydrophobic coating 300 may be a silicone-based hydrophobic coating or a nanoparticle hydrophobic coating, and the diameter of the nanoparticles is less than the inner diameter and depth of the groove 250. When the side chains of the silicone molecules are non-polar, such as methyl or other alkyl groups, these silicone derivatives tend to be hydrophobic.

[0059] As Figure 6 and Figure 7 shown, Figure 6 is a cross-sectional view of the nozzle plate 200 of the self-cleaning nozzle of the third embodiment of the present application, Figure 7 is Figure 5 a partial enlarged schematic view of the N position of

[0060] In the third embodiment of the present application, as Figure 6 and Figure 7 shown, the liquid spraying surface 220 has a flow guiding structure 260; the flow guiding structure 260 is arranged between the nozzles 210; the flow guiding structure 260 forms a convex structure 240 converging in the liquid spraying direction (the first direction) and / or a concave structure diffusing in the liquid spraying direction. Specifically, the flow guiding structure 260 has a plurality of inclined surfaces, and the plurality of inclined surfaces are combined to form a convex structure 240 converging in the liquid spraying direction (the first direction) and / or a concave structure diffusing in the liquid spraying direction. As Figure 6As shown, the concave structure is the diversion structure 260, and the convex structure 240 separates two adjacent diversion structures 260. The diversion structure 260 can extend from the liquid spraying surface 220 towards the inside of the self-cleaning nozzle along the first direction and is located between adjacent spray holes 210; the groove 250 is formed on the inner wall of the diversion structure 260. Optionally, the diversion structure 260 can include a cylindrical first part 261 and a flared second part 262; when the fluid 10 splashes onto the diversion structure 260, it can flow along the inner wall of the diversion structure 260 under the action of gravity, and the inner wall of the diversion structure 260 is provided with a groove 250 to form a nano-scale hydrophobic structure or a micro-scale hydrophobic structure, so that the fluid 10 will not adhere to the inner wall of the diversion structure 260, further improving the hydrophobic effect.

[0061] In the third embodiment of the present application, as Figure 7 shown, the diversion structure 260 is a groove-shaped structure that gradually expands from the inside of the self-cleaning nozzle to the liquid spraying surface 220. In some other embodiments of the present application, the diversion structure 260 can also be a linear groove structure that scatters from the inside of the self-cleaning nozzle to the liquid spraying surface 220. The gradually expanding groove-shaped structure can be, for example, a conical groove or a frustum-shaped groove. Such a setting is beneficial for the fluid 10 to flow along the inner wall of the diversion structure 260 and can further improve the hydrophobic effect.

[0062] Specifically, the diversion structure 260 is realized by lithography technology.

[0063] As Figure 8 and Figure 9 shown, Figure 8 is a schematic exploded view of the self-cleaning nozzle according to the fourth embodiment of the present application, Figure 9 is Figure 8 the B-B cross-sectional view of the spray hole plate 200 in

[0064] In the fourth embodiment of the present application, as Figure 8 and Figure 9 shown, the self-cleaning nozzle includes a main body part 100 and a spray hole plate 200 fixedly connected; the surface of the main body part 100 facing the spray hole plate 200 is recessed inward to form a receiving groove 120, and the spray hole plate 200 is covered at the opening of the receiving groove 120 to form a cavity with the main body part 100; the liquid outlet channel 110 extends from the surface of the main body part 100 away from the spray hole plate 200 towards the cavity until it communicates with the cavity; Figure 8In the illustrated embodiment, the number of liquid outlet channels 110 is two. In some other embodiments of the present application, the number of liquid outlet channels 110 can be one or more, and the present application does not limit this; the outlets of all the liquid outlet channels 110 converge on the cavity, and the fluid 10 enters the cavity from the inlet of the liquid outlet channel 110 through the liquid outlet channel 110, and then is ejected through the ejection holes 210.

[0065] The self-cleaning nozzle head of the embodiment of the present application realizes a superhydrophobic effect by forming a nanoscale hydrophobic structure or a microscale hydrophobic structure on the outer side surface of the nozzle plate 200, and can solve the problems that the ejection holes are easily blocked and the printed medium is polluted in the related art; this design can prevent liquids such as the fluid 10 from adhering to the ejection surface 220 of the nozzle plate 200, thereby keeping the ejection holes 210 unblocked, improving the printing quality and efficiency, having a self-cleaning ability at the same time, improving the ejection quality and printing accuracy, and prolonging the service life of the nozzle plate 200. At the same time, the self-cleaning characteristics of the nanoscale hydrophobic structure or the microscale hydrophobic structure can prolong the service life of the nozzle plate 200 and reduce the frequency of maintenance and replacement. The self-cleaning nozzle head of the embodiment of the present application can have a wide range of applications in application fields such as inkjet printing, dye jetting, and fluid spraying. In the field of inkjet printing, the stability and reliability of the printer can be improved, and the failures and downtime caused by the blockage of the ejection holes 210 can be reduced. In the fields of dye jetting and fluid spraying, the dye jetting and fluid spraying effects can be improved to make them more uniform and accurate. In addition, the application of the technical solution of the embodiment of the present application can also be extended to other fields that require control of liquid ejection, such as microfluidics, spray jetting, etc.; in these fields, the nanoscale hydrophobic structure or the microscale hydrophobic structure can provide more accurate ejection control and higher efficiency to meet the requirements of different application scenarios.

[0066] As Figure 10 shown, Figure 10 is a cross-sectional view of the nozzle plate 200 of the self-cleaning nozzle head of the fifth embodiment of the present application. The difference between the self-cleaning nozzle head of the fifth embodiment of the present application and the self-cleaning nozzle head of the first embodiment of the present application lies in the different structures of the ejection holes 210.

[0067] In the fifth embodiment of the present application, as Figure 10 shown, the inner diameter of the ejection hole 210 gradually increases in the direction of the ejection liquid towards the position close to the ejection surface 220, forming a tapered flaring that expands outwards, so that the spraying area of the fluid 10 is larger. Specifically, the ejection hole 210 can include a cylindrical hole portion away from the ejection surface 220, that is, the second through hole 2021, and a tapered flaring close to the ejection surface 220, that is, the first through hole 2011, and the two are connected to form a gradually expanding hole.

[0068] In the fifth embodiment of the present application, as Figure 10 shown, the axis of the tapered flaring is coaxially arranged with the axis of the ejection hole 210, asFigure 10 The dashed line is the axis of the nozzle hole 210. With such a setting, the fluid 10 ejected from the nozzle hole 210 is more uniform.

[0069] Next, a detailed description will be given of the preparation method of the nozzle plate 200 of the self-cleaning nozzle of the present application embodiment:

[0070] As Figure 11 shown, Figure 11 is a flowchart of the preparation method of the nozzle plate 200 of the self-cleaning nozzle of the present application embodiment. The preparation method of the nozzle plate 200 of the self-cleaning nozzle of the present application embodiment includes the following steps:

[0071] Step S1: Provide a traditional nozzle plate;

[0072] The liquid ejection surface 220 of the nozzle plate is made of a hydrophilic material;

[0073] Step S2: Form a hydrophobic structure 230 on the liquid ejection surface 220 of the nozzle plate;

[0074] The hydrophobic structure 230 can be a groove 250. The numerical range of the width of the groove 250 is 1 nm - 1 μm; the distance between two adjacent grooves 250 is 1 μm - 5 μm; the depth of the groove 250 does not penetrate the nozzle plate 200 and does not affect other graphic structures or functionalized areas;

[0075] If it is necessary to prepare the hydrophobic coating 300, after step S2, it may further include:

[0076] Step S3: Prepare the hydrophobic coating 300;

[0077] Put the nozzle plate 200 into a processing device, and form the hydrophobic coating 300 by physical or chemical methods; the hydrophobic coating layer 300 covers the surface of the liquid ejection surface 220 and / or the hydrophobic structure 230.

[0078] Step S4: After the hydrophobic coating 300 is formed, detect the hydrophobic performance of the groove 250 and determine whether to retain the hydrophobic coating 300;

[0079] If the particle diameter in the hydrophobic coating 300 is greater than the width or depth of the groove 250, then discard the hydrophobic coating 300 in the groove 250; otherwise, proceed to the next step;

[0080] If it is necessary to prepare the diversion structure 260, between step S1 and step S2, it may include:

[0081] Step S5: Form a diversion structure 260 on the liquid ejection surface 220;

[0082] The diversion structure 260 extends from the liquid spraying surface 220 towards the inside of the self-cleaning nozzle along the first direction and is located between adjacent spray holes 210; the groove 250 is formed on the inner wall of the diversion structure 260;

[0083] The prepared nozzle plate 200 is used in a printing device, and the printing function is realized by spraying through the spray holes 210.

[0084] Through the above embodiments, it is possible to form the groove 250 on the liquid spraying surface 220 of the nozzle plate 200, and utilize the air and the surface tension of the fluid 10 itself in the groove 250 to achieve the purpose of superhydrophobicity, thereby solving the problem of clogging the spray holes 210 of the traditional nozzle plate 200 and achieving the effect of self-cleaning.

[0085] An embodiment of the second aspect of the present application provides a printing device. The printing device includes the self-cleaning nozzle of any embodiment of the first aspect. The printing device of the embodiments of the present application includes the self-cleaning nozzle of any embodiment of the first aspect. The self-cleaning nozzle includes a nozzle body 20. The nozzle body 20 has a liquid spraying surface 220. Spray holes 210 are provided on the liquid spraying surface 220. A hydrophobic structure 230 is arranged on the surface of the liquid spraying surface 220. The hydrophobic structure 230 at least covers the surrounding area of the spray holes 210. The hydrophobic structure 230 is a micro-scale hydrophobic structure or a nano-scale hydrophobic structure. After the fluid 10 or a liquid such as a treatment liquid is ejected from the spray holes 210, it will not spread on the liquid spraying surface 220, reducing the occurrence of the situation where the fluid 10 or a liquid such as a treatment liquid adheres to the liquid spraying surface 220, thereby avoiding clogging the spray holes 210 and contaminating the printed medium, thereby reducing the cleaning and maintenance cost of the device and improving the printing effect of the printing device at the same time.

[0086] The above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A self-cleaning nozzle, characterized in that: include: A nozzle body (20); The spray head body (20) has a liquid spraying surface (220), and the liquid spraying surface (220) is provided with a spray hole (210); The surface of the liquid spraying surface (220) is provided with a hydrophobic structure (230); the hydrophobic structure (230) at least covers the surrounding area of ​​the spraying hole (210); The hydrophobic structure (230) is a micron-scale hydrophobic structure or a nano-scale hydrophobic structure.

2. The self-cleaning nozzle according to claim 1, characterized in that: The hydrophobic structure (230) includes a plurality of laid grooves (250).

3. The self-cleaning nozzle according to claim 2, characterized in that: The width of the groove (250) has a numerical range of 1 nm-1 μm; The distance between two adjacent grooves (250) is 1 μm-5 μm.

4. The self-cleaning nozzle according to claim 1, characterized in that: The hydrophobic structure (230) comprises a laid concave-convex array structure.

5. The self-cleaning nozzle according to claim 1, characterized in that: The liquid spraying surface (220) has a flow guiding structure (260); The flow guiding structure (260) is arranged between the spray holes (210); The flow-guiding structure (260) forms a convex structure (240) that converges toward the direction of the liquid spraying and / or a concave structure that spreads toward the direction of the liquid spraying.

6. The self-cleaning nozzle according to claim 1, characterized in that: The inner diameter of the spray hole (210) gradually increases along the spray direction toward a position close to the spray surface (220), forming a conical expansion opening that expands outwards.

7. The self-cleaning nozzle according to claim 6, characterized in that: The axis of the conical expansion opening is coaxially arranged with the axis of the spray hole (210).

8. The self-cleaning nozzle according to claim 1, characterized in that: The self-cleaning nozzle further comprises: a hydrophobic coating (300); The surface of the liquid spraying surface (220) and / or the hydrophobic structure (230) is covered with the hydrophobic coating (300).

9. The self-cleaning nozzle according to claim 2, characterized in that: The self-cleaning nozzle further comprises: a hydrophobic coating (300); the surface of the liquid spraying surface (220) and / or the surface of the hydrophobic structure (230) is covered with the hydrophobic coating (300); The hydrophobic coating (300) has nanoparticles, and the diameter of the nanoparticles is smaller than the inner diameter of the groove (250) and smaller than the depth of the groove (250).

10. A printing device, characterized in that: The printing device comprises the self-cleaning nozzle according to any one of claims 1-9.

Images