Liquid ejecting head and printing apparatus

Abstract

The application discloses a liquid ejection head and a printing device. The liquid ejection head comprises a common chamber for storing ink and providing ink to each ejection assembly, and a plurality of ejection assemblies. Each ejection assembly comprises a first damping part, a pressure chamber and a nozzle. The first damping part comprises a first damping flow channel and a second damping flow channel. The common chamber, the first damping flow channel, the second damping flow channel, the pressure chamber and the nozzle are sequentially communicated. The problem of mutual interference between a plurality of nozzles can be improved, and the consistency of ejection liquid is improved.

Description

Technical Field

[0001] This application relates to the field of printing technology, specifically to a liquid jet head and printing equipment. Background Technology

[0002] Printing technology is widely used in the manufacture of electronic devices due to its advantages such as low cost, high throughput, and ease of operation. Among them, inkjet printing is a non-contact, micron-level printing process that can achieve printing by directly jetting nano-sized ink onto flexible or rigid substrates.

[0003] Inkjet printing equipment includes an inkjet head capable of precisely depositing ink. The inkjet head comprises multiple nozzles, each of which is connected to a common chamber of a flow channel via a pressure chamber. In related technologies, inkjet printing equipment suffers from the problem of mutual interference between the multiple nozzles, which negatively impacts the consistency of ink ejection. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this application provides a liquid jetting head and a printing device.

[0005] In a first aspect, this application provides a liquid ejector head, the liquid ejector head including a common chamber and a plurality of ejection components, the common chamber being used to store ink and supply ink to each of the ejection components, each of the ejection components including a first damping part, a pressure chamber and a nozzle, the first damping part including a first damping channel and a second damping channel, the common chamber, the first damping channel, the second damping channel, the pressure chamber and the nozzle being sequentially connected.

[0006] In a second aspect, this application provides a printing device, the printing device including a power supply component and a liquid jet head as described in the first aspect, the power supply component being electrically connected to the liquid jet head.

[0007] This application provides a liquid jetting head and a printing device, which have the following technical advantages:

[0008] In the liquid injection head provided in this application, each injection component includes a first damping flow channel. When the nozzle injects liquid, a portion of the liquid flows back from the inlet of the pressure chamber through the first damping flow channel to the common chamber. The fluid pressure generated by this portion of liquid can be reduced through the first damping flow channel, thereby minimizing its impact on the common chamber. This effectively improves the problem of mutual interference between multiple nozzles and enhances the consistency of the injected liquid. Attached Figure Description

[0009] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0010] Figure 1 This is a three-dimensional structural diagram of a liquid injection head provided in an embodiment of this application.

[0011] Figure 2 An exploded view of the structure of a liquid injection head provided in an embodiment of this application.

[0012] Figure 3 for Figure 1 A cross-sectional view of the liquid injection head in the AA direction.

[0013] The attached figures are labeled as follows:

[0014] 1. Liquid jet head; 11. Liquid inlet; 12. Common chamber; 13. Jet assembly; 14. Jet body; 15. Flow channel; 16. Vibrating body; 17. Damping section; 18. Cover; 19. Signal wiring; 131. First damping section; 132. Pressure chamber; 133. Nozzle; 134. Flow limiting channel; 135. Buffer chamber; 136. Piezoelectric element; 137. Second damping section; 161. Silicon plate; 162. Oxide vibration diaphragm; 171. Support body; 172. Damping diaphragm; 173. Damping cavity; 1311. First damping flow channel; 1312. Second damping flow channel. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0016] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those familiar to those skilled in the art. Furthermore, any methods and materials similar to or equivalent to those described herein may be applied to this invention. The preferred embodiments and materials described herein are for illustrative purposes only and do not limit the scope of this application.

[0017] It should be noted that the order of description of the following embodiments is not intended to limit the preferred order of embodiments. The various embodiments of this application may exist in a range format. It should be understood that the description in a range format is merely for convenience and simplicity and should not be construed as a rigid limitation on the scope of the invention. Therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single numerical values ​​within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within the range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Furthermore, whenever a numerical range is indicated herein, it means including any referenced number (fraction or integer) within the indicated range.

[0018] In this application, the terms first, second, third, etc. are used merely as identifiers and do not impose numerical requirements or establish an order.

[0019] In this application, "A is located on one side of B", "A is located on the side of B away from C" or similar descriptions can mean that A and B are in direct contact or direct connection, or that A and B are in indirect contact or indirect connection.

[0020] The term "including" means "including but not limited to".

[0021] The term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. A and B can be singular or plural. The term "at least one" refers to one or more items, and "more than one" refers to two or more items. The terms "at least one," "at least one of the following," or similar expressions refer to any combination of these items, including any combination of a single or plural type. For example, "at least one of a, b, or c" or "at least one of a, b, and c" can be expressed as: a, b, c, ab (i.e., a and b), ac, bc, or abc, where a, b, and c can each be a single or multiple type.

[0022] The term "flow channel cross-section" refers to the cross-section of a flow channel perpendicular to the direction of liquid flow. Correspondingly, the cross-sectional area of ​​a flow channel is the area of ​​this cross-section perpendicular to the direction of liquid flow. When the flow channel cross-section is a regular shape, the area calculation formula for regular geometric shapes can be used. When the flow channel cross-section is an irregular shape, the irregular shape can be decomposed into multiple regular shapes, and then the area calculation formula for regular geometric shapes can be used to calculate the area separately. Alternatively, the irregular shape can be fitted to one or more regular shapes to calculate the area (i.e., the approximation method). As an example, the flow channel is a pipe, and the flow channel cross-section is circular.

[0023] The applicant discovered that in conventional inkjet heads, ink flows from a common chamber into a pressure chamber through a flow channel. A piezoelectric element then causes a pressure change within the pressure chamber, forcing the ink into the nozzle for ejection. Due to the highly precise design and small size of the flow channel, when one nozzle ejects ink, not only does some ink exit the nozzle, but a portion also flows back into the common chamber from the pressure chamber inlet. This flowing ink exerts fluid pressure on the common chamber. If other nozzles are simultaneously ejecting ink, this pressure affects the ejection volume and / or velocity of those nozzles, causing interference between them and negatively impacting the consistency of ink ejection.

[0024] Based on this, embodiments of this application provide a liquid injection head, such as... Figures 1 to 3 As shown, the liquid jet head 1 includes a common chamber 12 and a plurality of jetting assemblies 13. The common chamber 12 is used to store ink and supply ink to each jetting assembly 13. Each jetting assembly 13 includes a first damping part 131, a pressure chamber 132 and a nozzle 133. The first damping part 131 includes a first damping channel 1311 and a second damping channel 1312. The common chamber 12, the first damping channel 1311, the second damping channel 1312, the pressure chamber 132 and the nozzle 133 are connected in sequence.

[0025] It is understood that the common chamber 12 is connected to the inlet of the first damping flow channel 1311, the outlet of the first damping flow channel 1311 is connected to the inlet of the second damping flow channel 1312, the outlet of the second damping flow channel 1312 is connected to the inlet of the pressure chamber 132, and the outlet of the pressure chamber 132 is connected to the nozzle 133.

[0026] The liquid jetting head 1 can jet liquids including, but not limited to, water-based inks, solvent-based inks, dye-based inks, and pigment-based inks. Water-based inks use water as a carrier, or a mixture containing water and an organic solvent, while solvent-based inks use an organic solvent as a carrier. Liquids may include, for example, semiconductor materials and organic solvents. Semiconductor materials include, but are not limited to, luminescent materials, electronic functional materials, or hole-functional materials. Luminescent materials include, but are not limited to, one or more of organic luminescent materials and quantum dot materials.

[0027] In the liquid injection head 1 of this application embodiment, each injection component 13 includes a first damping flow channel 1311. When the nozzle 133 injects liquid, a portion of the liquid flows back from the inlet of the pressure chamber 132 through the first damping flow channel 1311 to the common chamber 12. The fluid pressure generated by this portion of liquid is partially lost during the flow through the first damping flow channel 1311, for example, one or more of friction loss, bend loss, and constriction loss occur. As a result, the fluid pressure exerted by the flowing liquid on the common chamber 12 is reduced, which can improve the problem of mutual interference between multiple nozzles 133 and improve the consistency of the injected liquid.

[0028] In some embodiments of this application, see further reference. Figures 1 to 3 The cross-sectional area of ​​the first damping channel 1311 is larger than that of the second damping channel 1312. On one hand, this structure helps limit the liquid flow rate entering the pressure chamber 132, avoiding excessive liquid injection. On the other hand, when the liquid flows back from the inlet of the pressure chamber 132 through the first damping channel 1311 to the common chamber 12, it further reduces the impact of fluid pressure on the common chamber 12, thereby further improving the problem of mutual interference between multiple nozzles 133. This is because the fluid pressure loss includes the loss of fluid pressure along the flow path, which includes the fluid pressure loss at the second damping channel 1312 and the fluid pressure loss at the first damping channel 1312. The pressure loss at the damping channel 1311 is due to the fact that the pressure loss along the flow path is inversely proportional to the cross-sectional area of ​​the flow path. Therefore, a significant amount of pressure loss occurs before the fluid enters the first damping channel 1311. In addition, the pressure loss also includes local pressure loss, which includes pressure loss at the bend and / or pressure loss at the expansion joint. Since the cross-sectional area of ​​the first damping channel 1311 is larger than that of the second damping channel 1312, a significant pressure loss will occur at the connection between the first damping channel 1311 and the second damping channel 1312 at the expansion joint.

[0029] It should be noted that, along the flow direction of the liquid in the first damping channel 1311, the cross-sectional area of ​​the first damping channel 1311 can gradually increase, gradually decrease, or remain constant; similarly, along the flow direction of the liquid in the second damping channel 1312, the cross-sectional area of ​​the second damping channel 1312 can gradually increase, gradually decrease, or remain constant. When the cross-sectional area of ​​the first damping channel 1311 gradually changes along the flow direction of the liquid in the first damping channel 1311, and the cross-sectional area of ​​the second damping channel 1312 gradually changes along the flow direction of the liquid in the second damping channel 1312, then the minimum cross-sectional area of ​​the first damping channel 1311 is greater than the maximum cross-sectional area of ​​the second damping channel 1312.

[0030] In some embodiments of this application, the shape of the cross-section of the first damping channel 1311 includes a circle, an arc, a rectangle, a square, or a trapezoid, and / or the shape of the cross-section of the second damping channel 1312 includes a circle, an arc, a rectangle, a square, or a trapezoid.

[0031] To further reduce the impact of fluid pressure on the common chamber 12, in some embodiments of this application, the centerline of the first damping channel 1311 is perpendicular to the centerline of the second damping channel 1312, so that the fluid pressure at the connection between the first damping channel 1311 and the second damping channel 1312 will have a large bend loss, thereby further reducing the fluid pressure exerted by the flowing liquid on the common chamber 12.

[0032] In some embodiments of this application, the flow length of the first damping flow channel 1311 is greater than the flow length of the second damping flow channel 1312. Since the pressure loss of the fluid along the flow path is proportional to the flow path length, by extending the flow path length of the first damping flow channel 1311, the pressure loss of the fluid at the first damping flow channel 1311 can be further increased, thereby further increasing the pressure loss of the fluid along the flow path and further reducing the influence of the fluid pressure on the common chamber 12.

[0033] In some embodiments of this application, each injection assembly 13 further includes a flow-limiting channel 134, which connects the pressure chamber 132 and the second damping channel 1312. The cross-sectional area of ​​the flow-limiting channel 134 is smaller than that of the second damping channel 1312. On the one hand, providing the flow-limiting channel 134 is more conducive to controlling the liquid flow rate entering the pressure chamber 132. On the other hand, when the liquid flows back from the inlet of the pressure chamber 132 to the common chamber 12 through the first damping channel 1311, the fluid pressure gradually decreases through the flow-limiting channel 134, the second damping channel 1312, and the first damping channel 1311.

[0034] It is understandable that the cross-sectional area of ​​the flow restrictor 134 can gradually increase, gradually decrease, or remain constant along the flow direction of the liquid in the flow restrictor 134. When the cross-sectional area of ​​the flow restrictor 134 gradually changes along the flow direction of the liquid in the flow restrictor 134, and the cross-sectional area of ​​the second damping flow channel 1312 gradually changes along the flow direction of the liquid in the second damping flow channel 1312, then the minimum cross-sectional area of ​​the second damping flow channel 1312 is greater than the maximum cross-sectional area of ​​the flow restrictor 134.

[0035] In some embodiments of this application, the first damping channel 1311, the second damping channel 1312, the pressure chamber 132, and the nozzle 133 are connected in sequence.

[0036] In some embodiments of this application, the shape of the flow channel cross-section of the flow restrictor 134 includes a circle, an arc, a rectangle, a square, or a trapezoid.

[0037] To further reduce the impact of fluid pressure on the common chamber 12, in some embodiments of this application, the centerline of the flow restrictor 134 is perpendicular to the centerline of the second damping flow channel 1312, so that the fluid pressure will have a large bend loss at the connection between the flow restrictor 134 and the second damping flow channel 1312, thereby further reducing the fluid pressure exerted by the flowing liquid on the common chamber 12.

[0038] In some embodiments of this application, see further reference. Figures 1 to 3 Each injection assembly 13 also includes a buffer chamber 135, which connects the flow-limiting channel 134 and the second damping channel 1312. When the nozzle 133 injects liquid, the buffer chamber 135 contains liquid, which can quickly replenish the liquid into the pressure chamber 132 and regulate the fluid resistance of the entire flow channel, improving the flow velocity stability at the liquid inlet and nozzle 133 outlet. To further increase the pressure loss along the flow path, the buffer chamber 135 and the second damping channel 1312 are vertically aligned. See also, as an example, the following is a further description. Figures 1 to 3 The pressure chamber 132, the flow restriction channel 134, and the buffer chamber 135 are connected in sequence.

[0039] In some embodiments of this application, see further reference. Figures 1 to 3 The pressure chamber 132 has a flow channel structure, and the centerline of the pressure chamber 132 is perpendicular to the centerline of the second damping flow channel 1312 to further increase the fluid pressure loss. The shape of the flow channel cross-section of the pressure chamber 132 includes, for example, a circle, an arc, a rectangle, a square, or a trapezoid.

[0040] In some embodiments of this application, see further reference. Figures 1 to 3 The liquid injection head 1 also includes a vibrating body 16, a flow channel body 15 and an injection body 14 stacked in sequence. The nozzle 133 of each injection component 13 is disposed on the injection body 14, the common chamber 12 and the first damping part 131 of each injection component 13 are disposed on the flow channel body 15, and the pressure chamber 132 is disposed on the vibrating body 16. The vibrating body 16 is provided with an opening, the position of which corresponds to the common chamber 12 and the opening is connected to the common chamber 12.

[0041] The jet 14, the flow channel 15, and the vibrator 16 are, for example, plate-like structures, and can be fabricated from a silicon wafer using semiconductor manufacturing techniques such as etching. The first damping flow channel 1311, the second damping flow channel 1312, and other flow channels can be formed on the flow channel 15 through an etching process. The shape of the flow channel cross-sectional area is not specifically limited, and may include, but is not limited to, a rectangle or an ellipse.

[0042] It should be noted that the flow channel 15 is a plate-like structure as an example; please refer to the following for further details. Figures 1 to 3 The direction parallel to the width of the flow channel 15 is the first direction, the direction parallel to the length of the flow channel 15 is the third direction, and the direction parallel to the thickness of the flow channel 15 is the second direction. Any two of the first, second, and third directions are perpendicular. The injection assembly 13 is arranged sequentially along the first direction, and the nozzles 133 of the injection assembly 13 are arranged at intervals along the first direction on the injection body 14. The injection body 14, the flow channel 15, and the vibrator 16 are arranged sequentially along the second direction, for example. The pressure chamber 132, the flow restrictor 134, and the buffer chamber 135 are connected sequentially along the third direction. The nozzle 133 can be a conventional structure in the art, and the nozzle 133 can be, for example, a hollow cone.

[0043] In some embodiments of this application, see further reference. Figures 1 to 3 The vibrator 16 includes, for example, a silicon plate 161 and an oxide vibrating film 162 stacked together, with the silicon plate 161 closer to the flow channel 15 than the oxide vibrating film 162. A pressure chamber 132 can be formed on the side of the silicon plate 161 closest to the flow channel 15 using an etching process.

[0044] In some embodiments of this application, see further reference. Figures 1 to 3 The liquid injection head 1 also includes a damping part 17, which is disposed on the side of the flow channel body 15 away from the vibrator 16. The damping part 17 includes a support body 171 and a damping diaphragm 172. The support body 171 is provided with a damping cavity 173, and the damping diaphragm 172 is suspended on the damping cavity 173. When the liquid flows back from the inlet of the pressure chamber 132 through the first damping flow channel 1311 to the common chamber 12, part of the fluid pressure can be absorbed by the damping part 17, thereby further reducing the influence of the fluid pressure on the common chamber 12. It should be noted that under the action of external force, the damping diaphragm 172 can undergo elastic deformation. The damping cavity 173 of the support 171 is a buffer space for the damping diaphragm 172 to undergo elastic deformation. The elastic deformation of the damping diaphragm 172 can absorb part of the fluid pressure and the oscillation pressure generated by the liquid sprayed by the nozzle 133. The material of the damping diaphragm 172 is not specifically limited. For example, the material of the damping diaphragm 172 can be one or more of polyphenylene sulfide and polyimide. In order to ensure better stability, the surface material of the damping diaphragm 172 can be an elastic material that does not react chemically with or is difficult to react with the liquid to be sprayed.

[0045] It should be noted that, through experiments, it has been found that, compared to directly connecting the common chamber 12 to the second damping flow channel 1312 of each spray assembly 13 without setting the first damping flow channel 1311, the liquid spray head 1 of this application embodiment has a better effect in preventing mutual interference between multiple nozzles 133. The reason is that when the nozzle 133 sprays liquid, a portion of the liquid will flow back from the inlet of the pressure chamber 132 through the first damping flow channel 1311 to the common chamber 12. The fluid pressure generated by this portion of liquid will be partially lost during the flow through the first damping flow channel 1311, thereby reducing the fluid pressure exerted on the common chamber 12 by the flowing liquid. In addition, when the liquid flows back from the inlet of the pressure chamber 132 through the first damping flow channel 1311 to the common chamber 12, a portion of the fluid pressure can be absorbed by the damping part 17, thereby further reducing the impact of fluid pressure on the common chamber 12.

[0046] In some embodiments of this application, see further reference. Figures 1 to 3 The support body 171 is arranged on the same layer as the spray body 14 and spaced apart, which can further improve the structural compactness and aesthetics of the liquid spray head 1, and further improve the problem of mutual interference between multiple nozzles 133.

[0047] In some embodiments of this application, see further reference. Figures 1 to 3 The damping membrane 172 covers the side of the common chamber 12 away from the vibrator 16 and extends to cover the side of each first damping channel 1311 away from the vibrator 16, which can further improve the effect of absorbing fluid pressure.

[0048] In some embodiments of this application, see further reference. Figure 2 and Figure 3 Each spray assembly 13 further includes a piezoelectric element 136 and a second damping part 137. The piezoelectric element 136 is disposed on the side of the vibrator 16 away from the flow channel body 15 and is disposed corresponding to the pressure chamber 132. The second damping part 137 is disposed on the flow channel body 15 and is connected to the pressure chamber 132 and the nozzle 133.

[0049] The piezoelectric element 136 is a driven element that deforms upon the supply of a drive signal. (Continue reading...) Figure 2 and Figure 3Multiple piezoelectric elements 136 are sequentially disposed along a first direction on the side of the oxide vibrating membrane 162 away from the silicon plate 161, and each piezoelectric element 136 is correspondingly disposed with a pressure chamber 132. By providing a driving signal to the piezoelectric element 136, the piezoelectric element 136 is deformed and vibrates, and the vibrating body 16 is linked, thereby changing the volume of the pressure chamber 132, changing the pressure inside the pressure chamber 132, and causing the liquid filling the pressure chamber 132 to be ejected through the nozzle 133. The piezoelectric element 136 can have a conventional structural composition, and for example, includes: a first electrode and a second electrode disposed opposite to each other, and a laminate disposed between the first electrode and the second electrode, the laminate including a piezoelectric layer.

[0050] The second damping section 137 can be a flow channel structure. The second damping section 137 can limit the liquid flow rate entering the nozzle 133, reduce the influence of fluid pressure on the injection volume and / or injection speed, and effectively improve the stability of the injection. The shape of the flow channel cross-section of the second damping flow channel 1312 includes circular, arc, rectangular, square or trapezoidal shapes.

[0051] It is understood that, in order to further reduce the impact of fluid pressure on the injection quantity and / or injection velocity, further reference is made to some embodiments of this application. Figure 2 and Figure 3 The second damping part 137 is vertically arranged between the pressure chamber 132 so that the fluid pressure has bend loss and expansion / contraction loss at the connection between the second damping part 137 and the pressure chamber 132. For example, the second damping part 137 and the second damping flow channel 1312 are arranged opposite each other on both sides of the pressure chamber 132.

[0052] In some embodiments of this application, see further reference. Figures 1 to 3 The liquid injection head 1 also includes a cover 18, which is located on the side of the vibrator 16 away from the flow channel body 15. The cover 18 has a liquid inlet 11, which communicates with the common chamber 12. The cover 18 prevents external water and oxygen from corroding the internal components of the liquid injection head 1. It is understood that when the vibrator 16 has an opening, the opening connects the liquid inlet 11 to the common chamber 12.

[0053] Liquid injection head 1 also includes some conventional components, for example, see [link to article] Figure 3 The liquid injection head 1 also includes a signal line 19 disposed on the cover 18, and the signal line 19 is electrically connected to the piezoelectric element 136.

[0054] This application also provides a printing device, such as an inkjet printer. The printing device includes a power supply component and a liquid ejector head, which are electrically connected. The specific structure of the liquid ejector head is described in the above embodiments. Since all the technical solutions of the above embodiments are adopted, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0055] In some embodiments of this application, the printing apparatus further includes a power unit, which is drivenly connected to the liquid jet head to move the liquid jet head. The power unit includes, but is not limited to, one or more of a conveying mechanism and a motor.

[0056] It is understood that the printing device may also include some conventional mechanisms, such as a liquid reservoir, which may be an ink cartridge, ink tank, or ink bag, used to supply liquid to the liquid inlet 11. The printing device also includes a control system, which may include, for example, a central processing unit and circuit components, and is capable of controlling operations such as the liquid reservoir injecting liquid into the liquid inlet 11, the movement of the liquid ejector head, and the ejection of liquid by the liquid ejector head.

[0057] The liquid jetting head and printing device provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A liquid injection head, characterized in that, The liquid jet head includes a common chamber and multiple jetting components. The common chamber is used to store ink and supply ink to each jetting component. Each jetting component includes a first damping section, a pressure chamber, and a nozzle. The first damping section includes a first damping channel and a second damping channel. The common chamber, the first damping channel, the second damping channel, the pressure chamber, and the nozzle are connected in sequence.

2. The liquid injection head according to claim 1, characterized in that, The cross-sectional area of ​​the first damping channel is larger than that of the second damping channel. Optionally, the shape of the cross-section of the first damping channel includes a circle, an arc, a rectangle, a square, or a trapezoid, and / or the shape of the cross-section of the second damping channel includes a circle, an arc, a rectangle, a square, or a trapezoid, and / or the centerline of the first damping channel is perpendicular to the centerline of the second damping channel, and / or the length of the first damping channel is greater than the length of the second damping channel.

3. The liquid injection head according to claim 1, characterized in that, The injection assembly further includes a flow-limiting channel, which connects the pressure chamber and the second damping channel, and the cross-sectional area of ​​the flow-limiting channel is smaller than that of the second damping channel. Optionally, the first damping channel, the second damping channel, the flow limiting channel, the pressure chamber, and the nozzle are connected in sequence, and / or the shape of the flow limiting channel cross-section includes a circle, an arc, a rectangle, a square, or a trapezoid, and / or the centerline of the flow limiting channel is perpendicular to the centerline of the second damping channel.

4. The liquid injection head according to claim 1, characterized in that, The pressure chamber has a flow channel structure, and the centerline of the pressure chamber is perpendicular to the centerline of the second damping flow channel; Optionally, the shape of the flow channel cross-section of the pressure chamber includes a circle, an arc, a rectangle, a square, or a trapezoid.

5. The liquid injection head according to any one of claims 1 to 4, characterized in that, The liquid injection head further includes a vibrating body, a flow channel body, and an injection body arranged in sequence, wherein the nozzle is disposed in the injection body, the common chamber and the first damping part are disposed in the flow channel body, and the pressure chamber is disposed in the vibrating body; The vibrating body has an opening, the position of which corresponds to the common chamber, and the opening communicates with the common chamber.

6. The liquid injection head according to claim 5, characterized in that, The liquid injection head also includes a shock-absorbing part, which is disposed on the side of the flow channel away from the vibrating body; the shock-absorbing part includes a support body and a shock-absorbing membrane, the support body is provided with a shock-absorbing cavity, and the shock-absorbing membrane is suspended on the shock-absorbing cavity.

7. The liquid injection head according to claim 6, characterized in that, The damping membrane covers the side of the common chamber away from the vibrating body and extends to cover the side of each of the first damping channels away from the vibrating body.

8. The liquid injection head according to claim 5, characterized in that, Each of the jetting components further includes a piezoelectric element and a second damping portion. The piezoelectric element is disposed on the side of the vibrator away from the flow channel body, and the piezoelectric element is disposed corresponding to the pressure chamber. The second damping portion is disposed in the flow channel body, and the second damping portion communicates with the pressure chamber and the nozzle. And / or, the liquid injection head further includes a cover body disposed on the side of the vibrator away from the flow channel body, the cover body having a liquid inlet connected to the common chamber.

9. A printing device, characterized in that, It includes a power supply component and a liquid injection head as described in any one of claims 1 to 8, wherein the power supply component is electrically connected to the liquid injection head.

10. The printing apparatus according to claim 9, characterized in that, The printing equipment also includes a power unit, which is connected to the liquid jet head to drive the liquid jet head to move.

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