An inkjet printhead anti-ink-splash structure with a negative pressure guide shroud

Abstract

This utility model belongs to the technical field of inkjet printing equipment, and discloses an inkjet printhead anti-ink-splash structure with a negative pressure guide shroud. It includes an inkjet printhead and a conical guide shroud coaxially sleeved around the outer periphery of the printhead. A porous adsorption layer is detachably installed at the end of the conical guide shroud. A negative pressure generator is installed on the conical guide shroud via a silicone hose, and the negative pressure generator is connected to the cavity of the conical guide shroud via the silicone hose. The cone angle of the conical guide shroud is 30-45°. The inner surface of the inkjet head is provided with guide grooves with a helix angle of 15-25° and a depth of 0.2-0.5 mm. The groove spacing is 3-5 times the nozzle diameter of the inkjet head. The porous adsorption layer is a sintered metal filter with an average pore size of 50-100 μm and a porosity of 60-70%. The negative pressure generator 4 is a pulse-type micro vacuum pump with an adjustable frequency range of 1-10 Hz and a negative pressure value of -5 kPa to -15 kPa. This invention not only prevents ink splatter but also avoids ink droplet accumulation.

Description

Technical Field

[0001] This utility model relates to the field of inkjet printing equipment technology, and in particular to an inkjet printhead anti-spraying structure with a negative pressure guide shroud. Background Technology

[0002] The inkjet printhead anti-splash structure with negative pressure guide shroud is a technical device that controls the ink jet trajectory through negative pressure airflow. It is mainly used to solve the problem of reduced printing accuracy caused by ink splashing or deviation during high-speed inkjet printing. Its core principle is to set up a guide shroud around the inkjet head and use the negative pressure environment to form a directional airflow field, thereby guiding the ink droplets to fly stably to the target position.

[0003] In traditional inkjet printing, high-speed ink droplets are easily scattered due to airflow disturbances (commonly known as "ink splatter"), leading to decreased print quality and printhead contamination. Existing technologies mostly use electrostatic adsorption or auxiliary airflow guidance, but these have the following drawbacks:

[0004] 1) Electrostatic adsorption requires high-voltage power supply, which increases energy consumption and is ineffective for some inks;

[0005] 2) The airflow guiding device has a complex structure and is prone to interfering with the flight trajectory of the main ink droplets;

[0006] 3) The protective cover only provides physical isolation and cannot actively control the direction of ink splatter. Therefore, we propose an inkjet printhead anti-ink splatter structure with a negative pressure guide cover. Utility Model Content

[0007] In view of the problems existing in the above-mentioned background technology, this utility model is proposed.

[0008] Therefore, the purpose of this utility model is to provide an inkjet printhead anti-ink-splashing structure with a negative pressure guide shroud. Its purpose is to prevent ink-splashing by setting a three-level protection system, which can not only prevent ink-splashing, but also avoid the accumulation of ink droplets.

[0009] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0010] An inkjet printhead anti-ink-splatter structure with a negative pressure guide shroud includes an inkjet printhead and a conical guide shroud coaxially sleeved around the outer periphery of the inkjet printhead. A porous adsorption layer is detachably installed at the end of the conical guide shroud. A negative pressure generator is installed on the conical guide shroud through a silicone hose, and the negative pressure generator is connected to the cavity of the conical guide shroud through the silicone hose to prevent ink splatter and avoid ink droplet accumulation.

[0011] As a technical solution of the inkjet printhead anti-splashing structure with negative pressure guide shroud of this utility model, the cone angle of the cone guide shroud is 30-45°, and the inner surface of the cone guide shroud is provided with a guide groove with a spiral angle of 15-25°. The spiral guide groove induces the formation of vortex airflow, causing the splashed ink to centrifugally gather to the shroud wall.

[0012] As a technical solution of the inkjet printhead anti-splashing structure with negative pressure guide shroud of this utility model, the depth of the guide groove is 0.2-0.5mm, and the groove spacing is 3-5 times the nozzle diameter of the inkjet head, so as to match the groove depth with the ink droplet size, generate sufficient capillary adsorption force, and avoid bridging and clogging of tiny ink droplets.

[0013] As a technical solution for the inkjet printhead anti-ink-splashing structure with negative pressure guide shroud of this utility model, the porous adsorption layer is a sintered metal filter screen with an average pore size of 50-100μm and a porosity of 60-70%, with high porosity to avoid rapid clogging.

[0014] As a technical solution of the inkjet printhead anti-splash structure with negative pressure guide shroud of this utility model, the negative pressure generator is a pulse micro vacuum pump, and the frequency of the pulse micro vacuum pump is adjustable in the range of 1-10Hz, the negative pressure value is -5kPa to -15kPa, and the intermittent negative pressure can avoid continuous airflow disturbance to the trajectory of the main ink droplet.

[0015] As a technical solution for the inkjet printhead anti-ink-splash structure with negative pressure guide shroud of this utility model, the conical guide shroud is made of 316L stainless steel, and the inner surface of the conical guide shroud is coated with a diamond-like carbon film with a thickness of 20-50μm to provide wear-resistant protection and chemical inertness.

[0016] As a technical solution of the inkjet printhead anti-splashing structure with negative pressure guide shroud of this utility model, it further includes an annular buffer cavity disposed between the conical guide shroud and the inkjet head, and the annular buffer cavity is provided with an auxiliary air inlet with an inclination angle of 45°. The inclination auxiliary air inlet forms a Venturi effect to assist the splashed ink to move towards the porous adsorption layer.

[0017] As a technical solution of the inkjet printhead anti-ink-splashing structure with negative pressure guide shroud of this utility model, wherein: a magnetic ring is embedded in the end of the conical guide shroud, the porous adsorption layer is detachably installed at the end of the conical guide shroud through the magnetic ring, an ink collection container is provided below the porous adsorption layer, and a liquid level sensor is provided in the ink collection container. The liquid level sensor provides early warning of ink volume to avoid overload causing negative pressure failure. At the same time, the ink collection container is environmentally friendly and recyclable to reduce pollution.

[0018] Compared with the prior art, the present invention has at least the following beneficial effects:

[0019] 1. This utility model uses a conical guide shroud to constrain the spread of flying ink, a negative pressure generator for active suction, and a porous adsorption layer for physical interception and secondary filtration, which can prevent flying ink and avoid the accumulation of ink droplets.

[0020] 2. This utility model, through the design of a magnetically detachable porous adsorption layer, enables quick assembly and disassembly, thereby improving the convenience of maintenance. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0023] Figure 2 For the present utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0024] Figure 3 This is a schematic diagram of the exploded structure of this utility model.

[0025] Figure 4 For the present utility model Figure 3 Enlarged structural diagram at point B.

[0026] Explanation of reference numerals in the attached figures:

[0027] In the diagram: 1. Inkjet head; 2. Conical shroud; 201. Guide groove; 202. Diamond-like carbon film; 203. Magnetic ring; 3. Porous adsorption layer; 4. Negative pressure generator; 5. Annular buffer chamber; 501. Auxiliary air inlet; 6. Ink collection container. Detailed Implementation

[0028] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0029] Reference Figures 1-4This invention provides an inkjet printhead anti-ink-splatter structure with a negative pressure guide shroud. This structure includes an inkjet printhead 1 and a conical guide shroud 2 coaxially sleeved around the outer periphery of the printhead 1. A porous adsorption layer 3 is detachably installed at the end of the conical guide shroud 2. A negative pressure generator 4 is installed on the conical guide shroud 2 via a silicone hose, and the negative pressure generator 4 is connected to the cavity of the conical guide shroud 2 via the silicone hose. In application, the conical guide shroud 2 constrains the range of ink splatter diffusion, the negative pressure generator 4 actively draws in ink, and the porous adsorption layer 3 performs physical interception and secondary filtration, thus preventing ink splatter and avoiding ink droplet accumulation.

[0030] Reference Figure 3 and Figure 4 The cone angle of the conical guide shroud 2 is 30-45°. The spiral angle design avoids the straight rebound of ink droplets. Combined with negative pressure, it forms a continuous airflow to reduce ink accumulation inside the shroud. The inner surface of the conical guide shroud 2 is provided with a guide groove 201 with a spiral angle of 15-25°. The spiral guide groove 201 induces the formation of vortex airflow, causing the flying ink to centrifugally gather to the shroud wall.

[0031] Reference Figure 3 and Figure 4 The depth of the guide groove 201 is 0.2-0.5mm. The groove depth can be achieved by precision stamping. The groove spacing of the guide groove 201 is 3-5 times the diameter of the nozzle of the inkjet head 1, so as to match the groove depth with the ink droplet size, generate sufficient capillary adsorption force, and avoid bridging and clogging of tiny ink droplets.

[0032] Reference Figure 3 and Figure 4 The porous adsorption layer 3 is a sintered metal filter screen. The sintered metal is resistant to solvent-based ink corrosion, which can extend its service life. The average pore size is 50-100μm and its porosity is 60-70%. The high porosity avoids rapid clogging.

[0033] Reference Figure 1 and Figure 3 The negative pressure generator 4 is a pulse-type micro vacuum pump, and the frequency of the pulse-type micro vacuum pump is adjustable from 1 to 10 Hz. The pulse frequency is synchronized with the printhead drive signal. The negative pressure is activated only during the ink droplet flight stage. The negative pressure value is -5 kPa to -15 kPa. Intermittent negative pressure can avoid continuous airflow disturbance to the main ink droplet trajectory.

[0034] Reference Figure 1 , Figure 3 as well as Figure 4 The conical fairing 2 is made of 316L stainless steel, and the inner surface of the conical fairing 2 is coated with a 20-50μm thick diamond-like carbon film 202 to provide wear-resistant protection and chemical inertness.

[0035] Reference Figure 1 and Figure 2 It also includes an annular buffer cavity 5 located between the conical guide shroud 2 and the inkjet head 1. The annular buffer cavity 5 has a balanced negative pressure distribution to avoid local airflow turbulence. The annular buffer cavity 5 is provided with an auxiliary air inlet 501 with an inclined angle of 45°. The inclined auxiliary air inlet 501 forms a Venturi effect to assist the ink to move towards the porous adsorption layer 3.

[0036] Reference Figure 3 and Figure 4 A magnetic ring 203 is embedded in the end of the conical flow guide shroud 2. The porous adsorption layer 3 can be detachably installed at the end of the conical flow guide shroud 2 via the magnetic ring 203, so as to facilitate quick disassembly and assembly, thereby improving the convenience of maintenance. Below the porous adsorption layer 3 is an ink collection container 6, which is equipped with a liquid level sensor. The liquid level sensor warns of the ink level to avoid overload and negative pressure failure. At the same time, the ink collection container 6 realizes environmentally friendly recycling to reduce pollution.

[0037] The working principle of this utility model is as follows: During inkjet printing, ink splatter and aerosol are captured by the conical guide shroud 2, and the airflow is induced by the spiral guide groove 201 to form a vortex, which gathers the ink splatter towards the shroud wall. At the same time, the negative pressure generator 4 is activated. At this time, the negative pressure generator 4 can draw the gathered ink splatter into the ink collection container 6 through the porous adsorption layer 3, so as to prevent ink splatter and avoid the accumulation of ink droplets. During this period, the liquid level sensor monitors the ink volume. When the volume is full, it can prompt the replacement of the porous adsorption layer 3, thereby preventing ink splatter and avoiding the accumulation of ink droplets.

[0038] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. An inkjet printhead anti-ink-splash structure with a negative pressure guide shroud, comprising an inkjet printhead (1), characterized in that: It also includes a conical guide shroud (2) coaxially sleeved on the outer periphery of the inkjet head (1), the end of the conical guide shroud (2) is detachably fitted with a porous adsorption layer (3), the conical guide shroud (2) is fitted with a negative pressure generator (4) through a silicone hose, and the negative pressure generator (4) is connected to the cavity of the conical guide shroud (2) through the silicone hose.

2. The inkjet printhead anti-ink-splash structure with negative pressure guide shroud according to claim 1, characterized in that: The cone angle of the cone-shaped shroud (2) is 30-45°, and the inner surface of the cone-shaped shroud (2) is provided with a guide groove (201) with a helix angle of 15-25°.

3. The inkjet printhead anti-ink-splash structure with negative pressure guide shroud according to claim 2, characterized in that: The depth of the guide groove (201) is 0.2-0.5mm, and the groove spacing of the guide groove (201) is 3-5 times the nozzle diameter of the inkjet head (1).

4. The inkjet printhead anti-ink-splash structure with negative pressure guide shroud according to claim 1, characterized in that: The porous adsorption layer (3) is a sintered metal filter screen with an average pore size of 50-100 μm and a porosity of 60-70%.

5. The inkjet printhead anti-ink-splash structure with negative pressure guide shroud according to claim 1, characterized in that: The negative pressure generator (4) is a pulsed micro vacuum pump, and the frequency of the pulsed micro vacuum pump is adjustable from 1 to 10 Hz, with a negative pressure value of -5 kPa to -15 kPa.

6. The inkjet printhead anti-ink-splash structure with negative pressure guide shroud according to claim 1, characterized in that: The conical air deflector (2) is made of 316L stainless steel, and the inner surface of the conical air deflector (2) is coated with a diamond-like carbon film (202) with a thickness of 20-50μm.

7. The inkjet printhead anti-ink-splash structure with negative pressure guide shroud according to claim 1, characterized in that: It also includes an annular buffer cavity (5) located between the conical air guide (2) and the inkjet head (1), and the annular buffer cavity (5) is provided with an auxiliary air inlet (501) with an inclination angle of 45°.

8. The inkjet printhead anti-ink-splash structure with negative pressure guide shroud according to any one of claims 1-7, characterized in that: The conical flow guide (2) has a magnetic ring (203) embedded in its end. The porous adsorption layer (3) is detachably installed at the end of the conical flow guide (2) through the magnetic ring (203). An ink collection container (6) is provided below the porous adsorption layer (3).

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