Liquid ejection device and substrate for liquid ejection device

Abstract

The utility model provides a kind of liquid injection device and substrate for liquid injection device, liquid injection device includes: multiple nozzles, is configured as interval arrangement and is arranged at least one row along first direction;Substrate, substrate is equipped with with multiple nozzles intercommunication public chamber, supply channel for the public chamber supplies liquid, public chamber continuously extends along first direction and defines fluid path, public chamber has interval arrangement first end surface and second end surface, extension section from first end surface continuously extends to second end surface;Wherein, the inner wall of public chamber is in the main body area of the profile of any section of definition fluid path is convex, the minimum curvature radius of the profile is greater than zero;Extension section and first end surface and second end surface smoothly connect.It is favorable that liquid is more smooth and liquid is stably sprayed from nozzle in public chamber, reduce the risk of nozzle blockage, improve injection reliability and stability.

Description

Technical Field

[0001] This utility model relates to the field of liquid jetting technology, and in particular to a liquid jetting device and a substrate for the liquid jetting device. Background Technology

[0002] Existing liquid jetting devices include multiple nozzles and a common channel connecting the multiple nozzles. The cross-sectional shape of the common channel is usually rectangular. There are multiple right-angle bends inside the common channel. When the liquid flows through the right-angle bends, turbulence is easily generated, causing bubbles to form. At the same time, bubbles, dust and other impurities are easily trapped at the right-angle bends, causing nozzle blockage and reducing the reliability of nozzle jetting. Utility Model Content

[0003] This invention addresses the problems existing in the prior art by providing a liquid jetting device that improves the cross-sectional profile shape of the common chamber inside the substrate. This eliminates any concave or sharp portions on the inner wall of the common chamber that are recessed towards the center of the cross-sectional profile, which facilitates smoother liquid flow within the common chamber and stable liquid ejection from the nozzle, thereby improving jetting reliability and stability.

[0004] In a first aspect, the present invention provides a liquid injection device, comprising: an injection section including a plurality of nozzles for injecting liquid, the plurality of nozzles being configured to be spaced apart along a first direction and arranged in at least one row; a substrate having a common chamber communicating with the plurality of nozzles and a supply channel for supplying liquid to the common chamber, the common chamber extending continuously along the first direction and defining a fluid path, the common chamber having a first end face and a second end face spaced apart, and an extension section extending continuously from the first end face to the second end face; wherein, the inner wall of the common chamber is convex in any cross-sectional profile of the main region defining the fluid path, and the minimum radius of curvature of the cross-sectional profile is greater than zero; the extension section is smoothly connected to the first end face and the second end face.

[0005] In one embodiment, any cross-sectional profile of the extension is circular, and the first end face and the second end face are hemispherical.

[0006] In one embodiment, the substrate includes a first substrate and a second substrate joined together to form the common chamber, wherein the first substrate and the second substrate are detachably connected.

[0007] In one embodiment, the first substrate is provided with a first connection hole, and the second substrate is provided with a second connection hole corresponding to the position of the first connection hole. The first connection hole and the second connection hole are connected by a connector.

[0008] In one embodiment, the nozzle is configured to spray liquid along a second direction that intersects with the first direction, the first substrate and the second substrate are spliced ​​along the second direction, the supply channel is disposed on the first substrate, and the second substrate is provided with a receiving groove; the spraying part is mounted on the receiving groove, and the second substrate is at least configured to provide mounting positioning and support for the spraying part.

[0009] In one embodiment, the common chamber includes a first chamber formed on the first substrate and a second chamber formed on the second substrate. The second substrate is provided with a communicating groove for connecting the receiving groove and the second chamber. The second chamber has a strip-shaped hole that communicates with the communicating groove. The receiving groove, the communicating groove, and the second chamber are sequentially connected and pass through the second substrate along a second direction. The first chamber, the second chamber, the communicating groove, and the receiving groove are sequentially arranged and connected along the second direction.

[0010] In one embodiment, the connection between the connecting groove and the second chamber is a smooth connection; and / or, the connection between the supply channel and the first chamber is a smooth connection.

[0011] In one embodiment, the projections of the center lines of the receiving groove in the first direction, the first chamber in the first direction, the second chamber in the first direction, the connecting groove in the first direction, the first substrate in the first direction, and the second substrate in the first direction in the second direction coincide in the second direction.

[0012] In one embodiment, the nozzle is configured to spray liquid along a second direction that intersects with the first direction. The substrate is provided with a connecting groove and a mounting groove for mounting the spraying part. The common cavity, the connecting groove, and the mounting groove are sequentially arranged and connected along the second direction.

[0013] Secondly, the present invention also provides a substrate for a liquid jetting device, which communicates with a plurality of nozzles arranged in at least one row along a first direction. The substrate has a common chamber communicating with the plurality of nozzles and a supply channel for supplying liquid to the common chamber. The common chamber extends continuously along the first direction and defines a fluid path. The common chamber has a first end face and a second end face spaced apart, and an extension section extending continuously from the first end face to the second end face. The inner wall of the common chamber has an outwardly convex profile in any cross-sectional contour of the main region defining the fluid path, and the minimum radius of curvature of the cross-sectional contour is greater than zero. The extension section is smoothly connected to the first end face and the second end face.

[0014] By adopting the above structure, this utility model has the following advantages compared with the prior art: The common chamber has a first end face and a second end face spaced apart, and an extension section continuously extending from the first end face to the second end face. The inner wall of the common chamber has an outwardly convex profile in any cross-sectional area defining the fluid path, and the minimum radius of curvature of the cross-sectional profile is greater than zero. The extension section is smoothly connected to the first end face and the second end face. The inner wall of the common chamber has no concave portions facing the center of the cross-sectional profile, and no sharp portions such as right angles or oblique angles, reducing the generation of bubbles and the retention of impurities. It also reduces flow resistance, facilitating smoother liquid flow within the common chamber and stable liquid ejection from the nozzle, reducing the risk of nozzle clogging, and improving injection reliability and stability. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural schematic diagram of the liquid injection device according to an embodiment of this application; Figure 2 for Figure 1 A three-dimensional structural diagram omitting the outer shell; Figure 3 for Figure 2 Top view; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 for Figure 3 A cross-sectional view along the BB direction; Figure 6 This is a three-dimensional structural schematic diagram of the first substrate according to an embodiment of this application; Figure 7 This is a three-dimensional structural schematic diagram of the second substrate according to an embodiment of this application; Figure 8 for Figure 7 A three-dimensional structural diagram of the second substrate from another angle. In the attached figures: substrate 1; first substrate 1a; second substrate 1b; supply channel 11; discharge channel 12; common chamber 13; first chamber 13a; second chamber 13b; first end face 131; second end face 132; extension section 133; strip hole 134; connecting groove 14; first connecting hole 15; second connecting hole 16; receiving groove 17; spray section 2; nozzle 21; outer shell 3; liquid spraying device 100. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] In the description of this specification, references to terms such as "an embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0018] like Figure 1-8 As shown, this application embodiment provides a liquid injection device 100, including: an injection section 2, the injection section 2 including a plurality of nozzles 21 for injection of liquid, the plurality of nozzles 21 being configured to be spaced apart along a first direction x and arranged in at least one row; a substrate 1, the substrate 1 having a common chamber 13 communicating with the plurality of nozzles 21 and a supply channel 11 for supplying liquid to the common chamber 13, the common chamber 13 extending continuously along the first direction x and defining a fluid path, the common chamber 13 having a first end face 131 and a second end face 132 spaced apart, and an extension section 133 extending continuously from the first end face 131 to the second end face 132, wherein the inner wall of the common chamber 13 is convex in any cross-sectional profile of the main region defining the fluid path, and the minimum radius of curvature of the cross-sectional profile is greater than zero; the extension section 133 is smoothly connected to the first end face 131 and the second end face 132.

[0019] Any cross section may include a cross section, a longitudinal section, and an oblique section in any direction. The convex shape, meaning it does not contain any recesses or indentations towards the center of the cross section profile, excludes any profile with concave portions, such as a gourd shape or any profile with grooves, preventing backflow or low-speed zones in the fluid path due to concave portions. The minimum radius of curvature is greater than zero, meaning there are no sharp points or corners, ensuring the boundary of the entire fluid path is continuous and smooth. The cross section profile may include a smooth closed curve, a closed rounded polygon with rounded corners at all edges, or other smooth convex profiles. The first end face 131 and the second end face 132 may be smooth curved surfaces.

[0020] The inner wall of the common chamber 13 has no concave portions facing the center of the cross-sectional profile, and there are no sharp parts such as right angles or oblique angles. This reduces the turbulence generated when the liquid flows through, thereby reducing the generation of bubbles and the retention of impurities such as bubbles and dust inside the common chamber 13. It also reduces flow resistance, which is conducive to smoother liquid flow in the common chamber 13 and stable liquid ejection from the nozzle 21. This reduces the risk of nozzle 21 clogging and improves the reliability and stability of the injection.

[0021] A smooth closed curve is a curve whose starting point and ending point are closed. The curve is differentiable everywhere in its domain, and its derivative (i.e., the tangent vector) changes continuously and is not zero. Intuitively, the curve has no sharp corners or breaks. A smooth closed curve can be a circle or an ellipse, etc.

[0022] A closed rounded polygon where all edges and corners are rounded: All adjacent straight edges of the polygon are connected by rounded transitions, and the straight edges are tangent to the rounded edges. Polygons can be triangles, quadrilaterals, pentagons, hexagons, etc.

[0023] A smooth surface is any surface that satisfies the conditions of constant or continuous curvature, no abrupt changes, and no sharp transitions, and does not contain any sharp transition regions of right angles, oblique angles, or other forms. Specifically, a smooth surface can be spherical, spherical cap-shaped, elliptical, or a circular arc surface with a polygonal center and annular outer contour edges. Each straight edge of the polygon is tangent to the circular arc surface, or the radius of curvature at the connection point between each straight edge of the polygon and the circular arc surface changes continuously.

[0024] Smooth connection: Adjacent surfaces are connected by a rounded corner with a constant radius of curvature or by a curved surface with a continuously varying radius of curvature. There are no sharp transition areas such as right angles or oblique angles between adjacent surfaces.

[0025] The substrate 1 of this invention offers high flexibility in material selection and manufacturing process. The substrate 1 can be made from corrosion-resistant polymer materials (such as photoresist, polyamide, polyimide, polybenzoxazole, etc.), glass, ceramics, metals, metal nitrides, or metal oxides, using CNC precision machining, laser cutting, stamping, laser micromachining, and other processing technologies. Suitable metals include copper and copper alloys, nickel and nickel-based alloys, aluminum and aluminum alloys, titanium and titanium alloys, cobalt-chromium alloys, and stainless steel. Alternatively, the substrate 1 can be made from semiconductors (such as silicon, germanium, etc.), dielectric materials, metals, metal nitrides, metal oxides, glass, ceramics, polymer materials, etc., and manufactured using semiconductor or micro / nano processing technologies such as photolithography, deep etching, and laser micromachining. Appropriate materials are selected based on the performance requirements of the substrate 1, and appropriate processing technologies are chosen based on the materials.

[0026] The jetting section 2 is a component from which liquid is ejected from the nozzle 21. As a specific example, the jetting section 2 can be a microporous structure with multiple nozzles 21, without an actuator. In a preferred embodiment, the jetting section 2 can be a nozzle plate structure. The jetting section 2 can be made of corrosion-resistant metal materials such as copper and copper alloys, nickel and nickel-based alloys, aluminum and aluminum alloys, titanium and titanium alloys, cobalt-chromium alloys, and stainless steel, or polymer materials such as polyamide, polyimide, epoxy resin, and photoresist, or ceramics or glass. The nozzles 21 and other precision structures can be fabricated using CNC precision machining, laser drilling, electroforming, stamping, photolithography, etching, etc. Alternatively, the jetting section 2 can be made of materials such as silicon, dielectric materials, metals, metal nitrides, metal oxides, glass, ceramics, and polymer materials, using semiconductor or micro / nano processing technologies such as photolithography, etching, and laser micromachining to fabricate the nozzles 21 and other precision structures. The choice of materials and processing technology is crucial for the jetting section 2. As another specific example, the ejection unit 2 can be a microelectronic device manufactured based on semiconductor technology. The ejection unit 2 includes a nozzle layer with a plurality of nozzles 21 and an actuator 22 coupled to the nozzles 21 to eject liquid droplets. The liquid ejection device 100 of this invention may or may not include an actuator, depending on the actual needs. The liquid ejection device 100 and the substrate 1 are applicable not only to on-demand inkjet printing but also to other liquid ejection systems such as continuous inkjet printing.

[0027] Specifically, such as Figure 4 and 5 As shown, as an example, any cross-sectional profile of the extension segment 133 is circular, and the first end face 131 and the second end face 132 are hemispherical. Of course, any cross-sectional profile of the extension segment 133 can also be a rounded polygon with rounded corners at all edges. Correspondingly, the first end face 131 and the second end face 132 are smooth curved surfaces that transition smoothly to the curved surfaces of each edge of the extension segment 133. The shape and size of the end face of the smooth curved surface are adapted to the shape and size of the cross-sectional profile at the end of the extension segment 133. Preferably, the cross-sectional profile is a symmetrical structure for easy processing. In other embodiments, the cross-sectional profile is also an asymmetrical structure.

[0028] Furthermore, such as Figure 6-7 As shown, the nozzle 21 is configured to spray liquid along a second direction z, which intersects with the first direction x. The substrate 1 has a connecting groove 14 and a receiving groove 17 for mounting the spraying part 2. The common chamber 13, the connecting groove 14, and the receiving groove 17 are sequentially arranged and connected along the second direction z. This arrangement allows the liquid to flow from the common chamber 13 through the connecting groove 14 into the nozzle 21 along the second direction z, without any bends. This minimizes the flow path of the liquid inside the substrate 1, reduces pressure loss, improves the smoothness of liquid flow, and thus ensures the spraying performance of the nozzle 21.

[0029] Furthermore, such as Figure 2 , 4 As shown in Figure -5, the substrate 1 includes a first substrate 1a and a second substrate 1b spliced ​​together to form the common chamber 13. The first substrate 1a and the second substrate 1b are detachably connected. The substrate 1 is divided into two parts, the first substrate 1a and the second substrate 1b, which are processed or formed separately and then assembled into a whole. This facilitates the processing or forming of the common chamber 13, meets the processing requirements for common chambers 13 with complex contours and specific shapes and sizes, and facilitates the maintenance of the common chamber 13. The detachable connection also facilitates the recycling of the first substrate 1a and the second substrate 1b in the later stages. The splicing direction of the first substrate 1a and the second substrate 1b is not limited. The first substrate 1a and the second substrate 1b can be spliced ​​and fixed along the first direction x, the second direction z, or the third direction y. The second direction z intersects the first direction x, and the third direction y intersects the first direction x and the second direction z respectively. When the liquid jetting device 100 is placed as shown in the figure, the first direction x can be horizontal, or it can be the arrangement direction of multiple nozzles 21 spaced apart in a row, or it can be the length direction of the liquid jetting device 100. The second direction z can be vertical, or it can be the direction in which the nozzles 21 spray liquid, or it can be the height direction of the liquid jetting device 100. The third direction y can be vertical or the width direction of the liquid jetting device 100. As an example, as shown in the figure, the first substrate 1a and the second substrate 1b are spliced ​​along the second direction z.

[0030] Specifically, to achieve the splicing of the first substrate 1a and the second substrate 1b into a single unit, as shown in Figure 1, the first substrate 1a has a first connecting hole 15, and the second substrate 1b has a second connecting hole 16 corresponding to the position of the first connecting hole 15. The first connecting hole 15 and the second connecting hole 16 are connected by a connector. The connector can be a bolt, a connecting pin, etc. The second connecting hole 16 is a through hole penetrating the thickness direction of the second substrate 1b. There can be multiple first connecting holes 15 and second connecting holes 16, evenly distributed on the first substrate 1a and the second substrate 1b. In addition to the above, the first substrate 1a and the second substrate 1b can also be assembled into a single unit using detachable methods such as adhesive bonding, magnetic connection, or snap-fit. The specific connection method can adopt the common connection methods for two existing components, which will not be elaborated here.

[0031] Furthermore, such as Figure 6-7As shown, nozzle 21 is configured to spray liquid along a second direction z, which intersects with the first direction x. The first substrate 1a and the second substrate 1b are joined along the second direction z. The supply channel 11 is located on the first substrate 1a. The second substrate 1b has a receiving groove 17, which communicates with the common chamber 13. The spraying part 2 is mounted on the receiving groove 17. The second substrate 1b is at least configured to provide mounting positioning and support for the spraying part 2. The first substrate 1a and the second substrate 1b are joined along the second direction z, allowing the receiving groove 17 to be formed solely from the second substrate 1b. This facilitates the installation of the spraying part 2 and the joining of the first substrate 1a and the second substrate 1b, and ensures that both the first chamber 13a and the second chamber 13b (mentioned below) are open towards the second direction z, facilitating processing, molding, and maintenance. Compared to existing methods that rely on additional supports or holders to fix the jetting part 2 to the substrate 1, in this application, the jetting part 2 can be directly installed into the receiving groove 17 of the second substrate 1b during assembly, without the need for supports or holders. This eliminates the need for assembling supports or holders, simplifies the assembly process of the jetting part 2, improves assembly efficiency, avoids the waste of production materials caused by the non-recyclability of supports or holders, and saves production costs. The jetting part 2 can be fixed in the receiving groove 17 by processes such as adhesive bonding, glass powder encapsulation, brazing, diffusion bonding, and bonding. The appropriate process can be selected based on factors such as the materials of the substrate 1 and the jetting part 2, the requirements for connection performance, and production requirements.

[0032] In other examples, the substrate 1 can also be a single piece without splicing. When the substrate 1 is a single piece, it can be provided with a receiving groove 17 for mounting the jetting part 2. The receiving groove 17 is exposed on the outer surface of the substrate 1. Optionally, during processing, the receiving groove 17, the connecting groove 14 mentioned below, and the common chamber 13 can be sequentially processed on the substrate 1. When the substrate 1 is not provided with a receiving groove 17, the jetting part 2 can be connected to the substrate 1 through other components such as a support or a retainer.

[0033] Furthermore, such as Figure 5-7As shown, the common chamber 13 includes a first chamber 13a formed on the first substrate 1a and a second chamber 13b formed on the second substrate 1b. The second substrate 1b is provided with a connecting groove 14 for connecting the receiving groove 17 and the second chamber 13b. The second chamber 13b has a strip-shaped hole 134 that communicates with the connecting groove 14. The receiving groove 17, the connecting groove 14, and the second chamber 13b are sequentially connected and pass through the second substrate 1b along the second direction z. The first chamber 13a, the second chamber 13b, the connecting groove 14, and the receiving groove 17 are sequentially arranged and connected along the second direction z. This arrangement allows the liquid to flow from the common chamber 13 through the connecting groove 14 into the nozzle 21 along the second direction z without any bends, minimizing the flow path of the liquid inside the substrate 1, reducing pressure loss, improving the smoothness of liquid flow, and thus ensuring the spraying performance of the nozzle 21. Compared to the common chamber 13 being integrally formed, the common chamber 13 is formed by connecting the first chamber 13a of the first substrate 1a and the second chamber 13b of the second substrate 1b. The first chamber 13a and the second chamber 13b are processed or formed separately, which makes it easier to process the common chamber 13 with the required cross-sectional shape and size, and also makes it easier to maintain the common chamber 13.

[0034] Based on this, preferably, the projections of the center lines of the receiving groove 17, the first chamber 13a, the second chamber 13b, the connecting groove 14, the first substrate 1a, and the second substrate 1b in the first direction x onto the second direction z coincide. This helps ensure installation accuracy and reduces processing difficulty. In other examples, the projections of the center lines of the common chamber 13 and the receiving groove 17 in the first direction x onto the second direction z can be staggered. To achieve this, optionally, the connecting groove includes a first groove segment extending along the first direction x and a second groove segment connecting the first groove segment and the receiving groove 17 along the second direction z.

[0035] like Figure 4 , 6 As shown, the supply channel 11 can be a straight channel, extending along the second direction z. The first chamber 13a and the supply channel 11 jointly penetrate the first substrate 1a along the second direction z. Alternatively, the supply channel 11 can be a non-straight channel with a corner, with the liquid inlet end of the supply channel 11 exposed on the outer surface of the first substrate 1a, and the liquid outlet end of the supply channel 11 connected to the first chamber 13a.

[0036] Furthermore, such as Figure 4 , 5As shown, the connection between the connecting channel 14 and the second chamber 13b is a smooth connection, which helps to improve the smoothness of liquid flow through the connection between the connecting channel 14 and the second chamber 13b, and reduces the generation and retention of air bubbles. Furthermore, as... Figure 4 , 6 As shown, the connection between the supply channel 11 and the first chamber 13a is a smooth connection, ensuring smooth liquid flow through the connection and reducing bubble generation and retention. Furthermore, as... Figure 4 , 6 As shown, the first substrate 1a is further provided with a discharge channel 12 communicating with the first chamber 13a. The supply channel 11 and the discharge channel 12 are spaced apart, and the inner wall of the discharge channel 12 is smoothly connected to the inner wall of the first chamber 13a. This makes the liquid flow more smoothly through the connection between the discharge channel 12 and the first chamber 13a, reducing the generation and retention of bubbles.

[0037] Furthermore, such as Figure 1 As shown, the liquid jetting device 100 also includes a housing 3 covering the substrate 1. The housing 3 includes a first housing and a second housing connected to the substrate 1. The first housing and the second housing are joined together to form a receiving cavity for accommodating the substrate 1. The housing 3 protects the substrate 1. The first housing and the second housing can be connected to the substrate 1 via connectors, referring to the connection method of the first substrate 1a and the second substrate 1b. Alternatively, the first housing and the second housing may have protruding connecting portions for connection and fixation between them.

[0038] The liquid jetting device 100 and substrate 1 of this invention are applicable not only to continuous inkjet printing, but also to other liquid jetting systems such as on-demand inkjet printing.

[0039] Example 2 like Figure 2-8As shown, this application embodiment also provides a substrate 1 for a liquid injection device 100. The substrate 1 has a common chamber 13 communicating with a plurality of nozzles 21 and a supply channel 11 for supplying liquid to the common chamber 13. The common chamber 13 extends continuously along a first direction x and defines a fluid path. The common chamber 13 has a first end face 131 and a second end face 132 spaced apart, and an extension segment 133 extending continuously from the first end face 131 to the second end face 132. The inner wall of the common chamber 13 has an outwardly convex cross-sectional profile in any section of the main region defining the fluid path, and the minimum radius of curvature of the cross-sectional profile is greater than zero. The extension segment 133 is smoothly connected to the first end face 131 and the second end face 132. The inner wall of the common chamber 13 has no concave portions facing the center of the cross-sectional profile, and there are no sharp parts such as right angles or oblique angles. This reduces the generation of bubbles and the retention of impurities, and also reduces flow resistance, which facilitates smoother liquid flow within the common chamber 13 and stable liquid ejection from the nozzle 21, reducing the risk of nozzle 21 clogging and improving the reliability and stability of the ejection process. The specific structure of the substrate 1 and its connection relationship with the ejection section 2 are as described in Embodiment 1, and will not be repeated here.

[0040] Although embodiments of the present invention have been shown and described above, they should not be construed as limiting the scope of the claims. The present invention is not limited to the above embodiments, and variations in its specific structure are permitted. All changes made within the scope of the independent claims of the present invention are within the scope of protection of the present invention.

Claims

1. A liquid injection device, characterized in that, include: The jetting section includes a plurality of nozzles for jetting liquid, the plurality of nozzles being configured to be spaced apart along a first direction and arranged in at least one row; The substrate has a common chamber communicating with the plurality of nozzles and a supply channel for supplying liquid to the common chamber. The common chamber extends continuously along a first direction and defines a fluid path. The common chamber has a first end face and a second end face spaced apart and an extension section extending continuously from the first end face to the second end face. Wherein, the inner wall of the common chamber is convex in any cross-sectional profile of the main region defining the fluid path, and the minimum radius of curvature of the cross-sectional profile is greater than zero; the extension segment is smoothly connected to the first end face and the second end face.

2. The liquid injection device as described in claim 1, characterized in that, The outline of any cross section of the extension is circular, and the first end face and the second end face are hemispherical.

3. The liquid injection device as described in claim 1, characterized in that, The substrate includes a first substrate and a second substrate joined together to form the common chamber, and the first substrate and the second substrate are detachably connected.

4. The liquid injection device as described in claim 3, characterized in that, The first substrate has a first connection hole, and the second substrate has a second connection hole corresponding to the position of the first connection hole. The first connection hole and the second connection hole are connected by a connector.

5. The liquid injection device as described in claim 3, characterized in that, The nozzle is configured to spray liquid along a second direction, which intersects with the first direction. The first substrate and the second substrate are spliced ​​along the second direction. The supply channel is provided on the first substrate, and the second substrate is provided with a receiving groove. The jetting section is mounted in the receiving groove, and the second substrate is configured at least to provide mounting positioning and support for the jetting section.

6. The liquid injection device as described in claim 5, characterized in that, The common chamber includes a first chamber formed on the first substrate and a second chamber formed on the second substrate. The second substrate is provided with a communicating groove for connecting the receiving groove and the second chamber. The second chamber has a strip-shaped hole that communicates with the communicating groove. The receiving groove, the communicating groove, and the second chamber are sequentially connected and pass through the second substrate along a second direction. The first chamber, the second chamber, the communicating groove, and the receiving groove are sequentially arranged and connected along the second direction.

7. The liquid injection device as claimed in claim 6, characterized in that, The connection between the connecting groove and the second chamber is a smooth connection; And / or, the connection between the supply channel and the first chamber is a smooth connection.

8. The liquid injection device as described in claim 6, characterized in that, The projections of the center lines of the receiving groove, the first chamber, the second chamber, the connecting groove, the first substrate, and the second substrate in the second direction in the second direction coincide in the second direction.

9. The liquid injection device as claimed in claim 1, characterized in that, The nozzle is configured to spray liquid along a second direction, which intersects with the first direction. The substrate is provided with a connecting groove and a mounting groove for mounting the spraying part. The common cavity, the connecting groove, and the mounting groove are sequentially arranged and connected along the second direction.

10. A substrate for a liquid jetting device, in communication with a plurality of nozzles arranged in at least one row along a first direction, characterized in that: The substrate is the substrate as described in any one of claims 1-9; The substrate is provided with a common chamber communicating with multiple nozzles and a supply channel for supplying liquid to the common chamber. The common chamber extends continuously along a first direction and defines a fluid path. The common chamber has a first end face and a second end face spaced apart and an extension section extending continuously from the first end face to the second end face. Wherein, the inner wall of the common chamber is convex in any cross-sectional profile of the main region defining the fluid path, and the minimum radius of curvature of the cross-sectional profile is greater than zero; the extension segment is smoothly connected to the first end face and the second end face.

Images