A structure for increasing the injection frequency of a liquid injection chip

Abstract

This invention discloses a structure for increasing the ejection frequency of a liquid jet chip, belonging to the field of MEMS process technology. It is incorporated into a liquid jet chip, which includes a vertically arranged ink inlet channel, a liquid flow channel, and a pressure chamber. The inlet of the ink inlet channel is located at the top of the liquid chip, and its bottom end connects to one end of the liquid flow channel. A one-way valve structure is installed on the liquid flow channel, and the pressure chamber connects to the other end of the liquid flow channel. An ejection orifice is located at the bottom of the liquid jet chip, and the pressure chamber connects to the orifice. The ejection direction of the orifice is vertically downward. This invention incorporates a Tesla valve in the liquid flow channel, enabling normal forward liquid flow. When liquid flows in the opposite direction, it forms a vortex upon passing through the Tesla valve, preventing backflow. This increases the chip's power efficiency, reduces power consumption, and improves the ejection frequency. The structure is simple, eliminates component wear, and is more durable.

Description

Technical Field

[0001] The utility model belongs to the technical field of MEMS technology, and in particular relates to a structure for improving the injection frequency of a liquid injection chip. Background Art

[0002] Inkjet printers use inkjet heads (liquid jet chips) to spit out droplets of ink onto paper to form images or characters, thereby achieving the printing function. The liquid flow channel of a liquid jet chip is generally designed as a direct current channel. When the jet hole is not performing a jetting operation, the cold pressure in the pressure chamber is reduced, causing liquid reflux. When multiple jet holes are evenly distributed for jetting operations, a large amount of liquid will reflux, reducing power efficiency. A Chinese patent (CN108407465A) discloses a liquid jet head chip, a liquid jet head, and a liquid jet device. The inlet flow path set on the flow path plate in the patented technical solution is the above-mentioned direct current channel. When performing a jetting operation, liquid reflux is likely to occur, reducing power efficiency. Utility Model Content

[0003] In view of this, the utility model provides a structure for increasing the injection frequency of a liquid injection chip, so as to solve the above-mentioned problem.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A structure for improving the injection frequency of a liquid injection chip is arranged in a liquid injection chip. The liquid injection chip is provided with an ink inlet channel, a liquid flow channel and a pressure chamber arranged in a vertical direction. The inlet of the ink inlet channel is arranged at the top of the liquid chip. The bottom end of the ink inlet channel is connected to one end of the liquid flow channel. A one-way valve structure is arranged on the liquid flow channel. The pressure chamber is connected to the other end of the liquid flow channel. A spray hole is arranged at the bottom end of the liquid injection chip. The pressure chamber is connected to the spray hole. The spray direction of the spray hole is vertically downward.

[0006] Furthermore, the one-way valve structure is a Tesla valve.

[0007] Furthermore, the top wall of the pressure chamber is provided with a heating resistor.

[0008] Furthermore, a liquid flow sub-channel is also provided on the liquid injection chip, and the pressure chamber and the spray hole are provided in plurality. The liquid flow sub-channel is vertically connected with the other end of the liquid flow channel. The plurality of pressure chambers are arranged side by side on both sides of the liquid flow channel, and the side-by-side direction is parallel to the liquid flow channel. The plurality of pressure chambers are all connected with the liquid flow sub-channels on both sides of the liquid flow channel, and the plurality of spray holes are all connected with the bottom ends of the corresponding pressure chambers.

[0009] Furthermore, a hydrophilic medium is provided on the side wall of the ink inlet channel.

[0010] The beneficial effects of the utility model are:

[0011] The utility model sets a Tesla valve with a one-way valve function on the liquid flow channel, so that when the liquid passes through the ink inlet channel and enters the liquid flow channel, the liquid flows normally through the Tesla valve when it flows forward, and forms a vortex when it passes through the Tesla valve when it flows reversely to prevent the backflow of the liquid, thereby increasing the power efficiency of the chip, reducing power consumption, and improving the chip injection frequency. The utility model has a simple structure, no wear of parts, and is more durable. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0013] Figure 1 is a schematic diagram of a structure for improving the injection frequency of a liquid injection chip according to Embodiment 1;

[0014] Figure 2 is a top view of a method of increasing the ejection frequency of a liquid ejection chip according to embodiment 1;

[0015] Figure 3 is a bottom view of a method of increasing the ejection frequency of a liquid ejection chip according to embodiment 1;

[0016] Figure 4 yes Figure 2 Sectional view of AA in the middle;

[0017] Figure 5 yes Figure 3 Cross-sectional view of the middle BB;

[0018] Figure 6 yes Figure 4 Cross-sectional view of CC;

[0019] Figure 7 is a schematic diagram of a structure for improving the injection frequency of a liquid injection chip according to Embodiment 2;

[0020] Figure 8 is a top view of a method of increasing the ejection frequency of a liquid ejection chip according to Embodiment 2;

[0021] Fig. 9 is a bottom view of a method of increasing the ejection frequency of a liquid ejection chip according to embodiment 2;

[0022] Fig.10 yes Figure 8 Cross-sectional view of the middle DD;

[0023] Fig.11 yes Fig. 9 Sectional view of EE in the figure;

[0024] Fig.12 yes Fig. 9 Cross-sectional view of the middle FF;

[0025] Fig.13 yes Fig.10 Cross-sectional view of middle GG;

[0026] Among them, in the figure:

[0027] 1-liquid jet chip, 2-liquid flow channel, 3-ink inlet channel, 4-nozzle hole, 5-Tesla valve, 6-liquid flow sub-channel, 7-pressure chamber, 8-heating resistor. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Example 1

[0030] See attached Figure 1-6 As shown, the utility model provides a structure for improving the injection frequency of a liquid injection chip, which is arranged in a liquid injection chip 1. The liquid injection chip 1 is provided with an ink inlet channel 3, a liquid flow channel 2 and a pressure chamber 7 arranged in a vertical direction. The inlet of the ink inlet channel 3 is arranged at the top of the liquid chip, and the bottom end of the ink inlet channel 3 is connected with one end of the liquid flow channel 2. A one-way valve structure is arranged on the liquid flow channel 2, and the pressure chamber 7 is connected with the other end of the liquid flow channel 2. A spray hole 4 is arranged at the bottom end of the liquid injection chip 1, and the pressure chamber 7 is connected with the spray hole 4. The spray direction of the spray hole 4 is vertically downward.

[0031] In a preferred embodiment, the one-way valve structure is a Tesla valve 5, which is used to realize the normal flow of liquid in the liquid flow channel 2 in the forward direction, and to form a vortex through the action of the Tesla valve 5 in the reverse direction to prevent the backflow of the liquid.

[0032] In a preferred embodiment, a heating resistor 8 is disposed on the top wall of the pressure chamber 7. The heating resistor 8 generates heat to form pressure in the pressure chamber 7, and liquid is ejected through the nozzle 4 to perform printing.

[0033] In a preferred embodiment, a hydrophilic medium is provided on the side wall of the ink inlet channel 3; a hydrophilic medium such as SiO2, SiN, Cu, Au, Cr and Ta is coated on the side wall of the ink inlet channel 3 by a PECVD process to increase the fluidity of the liquid.

[0034] Embodiment 1 is a "single channel corresponding to single nozzle" structure. Liquid enters into the liquid flow channel 2 through the ink inlet channel 3. During printing operation, liquid flows normally in the liquid flow channel 2, passes through the Tesla valve 5, and enters into the pressure chamber 7 through the liquid flow branch channel 6. The heating resistor 8 generates heat to form pressure in the pressure chamber 7, and liquid is ejected through the nozzle 4 to perform printing operation. When some nozzles 4 do not spray ink during the printing process, the heating resistor 8 cools the pressure chamber 7 to reduce the pressure, and the liquid flows back from the pressure chamber 7 to the liquid flow branch channel 6. When the refluxed liquid passes through the Tesla valve 5 in the liquid flow channel 2, a vortex is formed to prevent the reflux of the liquid.

[0035] Example 2

[0036] See attached Figure 7-13 As shown, unlike Example 1, the liquid jet chip 1 in Example 2 is also provided with a liquid flow sub-channel 6, and the pressure chamber 7 and the nozzle hole 4 are provided in plurality. The liquid flow sub-channel 6 is vertically connected with the other end of the liquid flow channel 2, and the liquid enters the two branches of the liquid flow sub-channel 6 from the liquid flow channel 2; the plurality of pressure chambers 7 are arranged side by side on both sides of the liquid flow channel 2, and the side-by-side direction is parallel to the liquid flow channel 2, and the plurality of pressure chambers 7 are all connected with the liquid flow sub-channels 6 on both sides of the liquid flow channel 2, and the plurality of nozzle holes 4 are all connected with the bottom ends of the corresponding pressure chambers 7. The one-way valve structure in the liquid flow channel 2 of the liquid jet chip 1 in Example 2 is the same as that in Example 1, which is a Tesla valve 5, and the side wall of the ink inlet channel 3 is coated with a hydrophilic medium such as SiO2, SiN, Cu, Au, Cr and Ta by the PECVD process to increase the fluidity of the liquid.

[0037] Embodiment 2 is a "single channel corresponding to multiple nozzles" structure, in which the liquid enters the liquid flow channel 2 through the ink inlet channel 3, and the liquid enters the two branches of the liquid flow branch channel 6 from the liquid flow channel 2, and then enters the multiple pressure chambers 7 on the liquid flow branch channel 6; during the printing operation, the liquid flows normally in the liquid flow channel 2, passes through the Tesla valve 5, and enters the pressure chamber 7 through the liquid flow branch channel 6, the heating resistor 8 generates heat to form pressure in the pressure chamber 7, and the liquid is ejected through the nozzle 4 to perform the printing operation; when some nozzles 4 do not spray ink during the printing process, the heating resistor 8 cools the pressure chamber 7 to reduce the pressure, and the liquid flows back from the pressure chamber 7 to the liquid flow branch channel 6, and the refluxed liquid forms a vortex when passing through the Tesla valve 5 in the liquid flow channel 2 to prevent the reflux of the liquid.

[0038] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A structure for increasing the injection frequency of a liquid injection chip, arranged in a liquid injection chip (1), characterized in that: A liquid jet chip (1) is provided with an ink inlet channel (3), a liquid flow channel (2) and a pressure chamber (7) arranged in a vertical direction. The inlet of the ink inlet channel (3) is arranged at the top of the liquid chip. The bottom end of the ink inlet channel (3) is connected to one end of the liquid flow channel (2). A one-way valve structure is arranged on the liquid flow channel (2). The pressure chamber (7) is connected to the other end of the liquid flow channel (2). A spray hole (4) is arranged at the bottom end of the liquid jet chip (1). The pressure chamber (7) is connected to the spray hole (4). The spray direction of the spray hole (4) is vertically downward.

2. A structure for increasing the injection frequency of a liquid injection chip according to claim 1, characterized in that: The one-way valve structure is a Tesla valve (5).

3. A structure for increasing the injection frequency of a liquid injection chip according to claim 2, characterized in that: The top wall of the pressure chamber (7) is provided with a heating resistor (8).

4. A structure for increasing the injection frequency of a liquid injection chip according to claim 3, characterized in that: The liquid jet chip (1) is also provided with a liquid flow sub-channel (6), the pressure chamber (7) and the spray hole (4) are arranged in plurality, the liquid flow sub-channel (6) is vertically connected to the other end of the liquid flow channel (2), the plurality of pressure chambers (7) are arranged side by side on both sides of the liquid flow channel (2), and the side-by-side direction is parallel to the liquid flow channel (2), the plurality of pressure chambers (7) are all connected to the liquid flow sub-channels (6) on both sides of the liquid flow channel (2), and the plurality of spray holes (4) are all connected to the bottom ends of the corresponding pressure chambers (7).

5. The structure for increasing the ejection frequency of a liquid ejection chip according to claim 1, characterized in that: The side wall of the ink inlet channel (3) is provided with a hydrophilic medium.

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