High-speed switch nozzle applied to ink-jet printer

Abstract

The utility model discloses a high-speed switch nozzle applied to an ink-jet printer, which comprises a nozzle body, an ink quantifying cavity is arranged in the nozzle body, a nozzle is embedded at one end of the nozzle body, and the nozzle is communicated with the ink quantifying cavity; an ink injection connector is arranged at the position, corresponding to the ink quantifying cavity, of the nozzle body in a penetrating mode. A permanent magnet movable valve element is arranged in the ink quantifying cavity in a sliding mode, and a reset spring is arranged on the side, away from the nozzle, of the permanent magnet movable valve element in the ink quantifying cavity. The position, corresponding to the permanent magnet movable valve element, of the outer wall of the spray head body is fixedly sleeved with an electromagnetic coil. According to the utility model, the nozzle and the needle valve are integrally designed, so that ink retained in a channel is effectively reduced, the control response speed of the nozzle is structurally improved, and the permanent magnet is adopted to replace an electromagnet to serve as the movable valve core, so that the structural complexity of the needle valve is reduced, and the volume of the valve body is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of inkjet printers, in particular to a high-speed switch nozzle applied to inkjet printers. Background Art

[0002] Inkjet printers are widely used due to their rich pigment colors and low cost. The nozzle is the key to inkjet printers. The size of the ink dots and the quality of the formation are the key to the printing quality. Common nozzle forms include thermal conductivity print heads, thermal bubble print heads, jet inkjet print heads, micro-jet print heads and other forms. Among them, the driving method of the micro-jet print head adopts the atomization formation of pressurized ink passing through the micropores of the gem nozzle. The size of the ink dots can be controlled by controlling the switch of the nozzle. The morphological quality of the ink dots of the print head is directly related to the performance indicators of the printer, and the key factors affecting the morphology of the ink dots include the nozzle aperture, the shape of the opening, and the speed of the ink on-off action of the nozzle; among them, the speed of the ink on-off action is the most important one.

[0003] The existing nozzles have the following disadvantages: 1. The nozzle and the needle valve that controls the on-off of the ink are separated. As a result, a lot of ink will be retained in the channel connecting the two, reducing the corresponding speed of the nozzle control; 2. The ordinary needle valve is an electromagnet structure, which is relatively complex and large in size, which is not conducive to improving the on-off speed of the nozzle. Utility Model Content

[0004] The purpose of the utility model is to provide a high-speed switch nozzle for an inkjet printer to solve the problems existing in the above-mentioned prior art.

[0005] A high-speed switch nozzle for an inkjet printer comprises a nozzle body, the nozzle body is in a cylindrical structure as a whole, an ink quantitative cavity is provided inside the nozzle body, the ink quantitative cavity is a cylindrical cavity and its axis coincides with the axis of the nozzle body; a nozzle is embedded in the middle of one end of the nozzle body, and the nozzle is communicated with the ink quantitative cavity; an ink injection interface is penetrated at a position corresponding to the ink quantitative cavity and at one end close to the nozzle on the nozzle body, and the ink injection interface is communicated with the ink quantitative cavity; a permanent magnet moving valve core is slidably arranged in the ink quantitative cavity, the permanent magnet moving valve core is a cylinder and its side wall is sealed and slidably connected with the side wall of the ink quantitative cavity; a return spring is arranged in the ink quantitative cavity at a side of the permanent magnet moving valve core away from the nozzle; one end of the return spring is fixedly connected to the end face of the ink quantitative cavity and the other end is fixedly connected to the permanent magnet moving valve core; an electromagnetic coil is fixedly sleeved at a position corresponding to the permanent magnet moving valve core on the outer wall of the nozzle body.

[0006] Preferably, the end surface of the permanent magnet movable valve core close to the nozzle and the end surface of the ink quantitative cavity close to the nozzle are both truncated cone-shaped and can fit tightly.

[0007] Preferably, the nozzle body is made of ABS material.

[0008] Preferably, the nozzle is a jewel nozzle.

[0009] Preferably, the permanent magnet moving valve core is magnetized by a high-density magnetization method.

[0010] The utility model discloses the following technical effects:

[0011] 1. The utility model adopts an integrated design of the nozzle and the needle valve, which effectively reduces the ink retained in the channel and improves the control response speed of the nozzle from a structural perspective.

[0012] 2. The utility model directly adopts permanent magnets instead of electromagnets as the moving valve core, which reduces the structural complexity of the needle valve, and the permanent magnet direct drive method can effectively reduce the volume of the valve body compared with the traditional magneto-electric structure.

[0013] 3. The utility model places the permanent magnet at the center line of the electromagnetic coil, which is in the center of the magnetic circuit, and has the characteristic of high utilization rate of electromagnetic energy converted into kinetic energy. Therefore, the acceleration of the moving valve core is faster, which effectively improves the action speed of the nozzle.

[0014] 4. The movable valve core in the utility model adopts a high-density magnetization method, which can further reduce the volume and weight of the movable valve core, and is more conducive to improving the on-off speed of the nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] 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 will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 This is a schematic diagram of the structure of the utility model when the ink channel is opened;

[0017] Figure 2 This is a schematic diagram of the structure of the utility model when the ink channel is disconnected.

[0018] in:

[0019] 1. Nozzle; 2. Ink injection interface; 3. Electromagnetic coil; 4. Permanent magnet moving valve core; 5. Return spring; 6. Nozzle body; 7. Ink metering chamber. DETAILED DESCRIPTION

[0020] 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.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] See attached Figure 1-2 A high-speed switch nozzle for an inkjet printer includes a nozzle body 6, which is a cylindrical structure as a whole. An ink quantitative cavity 7 is provided inside the nozzle body 6. The ink quantitative cavity 7 is a cylindrical cavity and its axis coincides with the axis of the nozzle body 6; a nozzle 1 is embedded in the middle of one end of the nozzle body 6, and the nozzle 1 is connected to the ink quantitative cavity 7; an ink injection interface 2 is penetrated at a position corresponding to the ink quantitative cavity 7 and at one end close to the nozzle 1 on the nozzle body 6, and the ink injection interface 2 It is connected to the ink metering cavity 7; a permanent magnet moving valve core 4 is slidably arranged in the ink metering cavity 7, and the permanent magnet moving valve core 4 is a cylinder and the side wall is sealed and slidably connected with the side wall of the ink metering cavity 7; a return spring 5 is arranged in the ink metering cavity 7 on the side of the permanent magnet moving valve core 4 away from the nozzle 1; one end of the return spring 5 is fixedly connected to the end face of the ink metering cavity 7 and the other end is fixedly connected to the permanent magnet moving valve core 4; an electromagnetic coil 3 is fixedly sleeved at the position corresponding to the outer wall of the nozzle body 6 and the permanent magnet moving valve core 4.

[0023] The end of the ink injection interface 2 away from the nozzle body 6 is connected to the external pressurized ink, and the pressurized ink can flow into the ink quantitative cavity 7 through the ink injection interface 2. Under the action of pressure, the ink is atomized and sprayed out at the outlet of the nozzle 1; the cross-sections of the ink quantitative cavity 7 and the permanent magnet moving valve core 4 are both circular and of the same size, and the permanent magnet moving valve core 4 can slide in the ink quantitative cavity 7; the axis of the nozzle 1 also coincides with the axis of the ink quantitative cavity 7, and the cross-sectional area of ​​the ink quantitative cavity 7 is larger than the end face of the nozzle 1. In this way, the permanent magnet moving valve core 4 can completely block the nozzle 1, and at the same time, the side wall of the permanent magnet moving valve core 4 will also block the end of the ink injection interface 2 connected to the ink quantitative cavity 7, thereby blocking the ink; one end of the return spring 5 is fixedly connected to the end surface of the ink quantitative cavity 7 away from the nozzle 1, and the other end is fixedly connected to the end surface of the permanent magnet moving valve core 4 away from the nozzle 1. Under the action of the return spring 5, the permanent magnet moving valve core 4 will automatically slide towards the direction of the nozzle 1 and block the nozzle 1 and the ink injection interface 2, thereby cutting off the flow of ink. In this way, even in the case of power failure, there will be no ink leakage.

[0024] The permanent magnet moving valve core 4 is made of permanent magnet material and adopts axial magnetization. The electromagnetic coil 3 is cylindrical and sleeved on the nozzle body 6. The magnetic field generated by the electromagnetic coil will pass through the center of the electromagnetic coil, that is, the center of the nozzle body 6. When the direction of the magnetic field generated by the electromagnetic coil 3 is consistent with the direction of the magnetic pole of the horizontal magnetization of the permanent magnet moving valve core 4, the permanent magnet moving valve core 4 moves in one direction. When the electromagnetic coil 3 is reversely energized, the magnetic field generated is opposite to the magnetic pole direction of the permanent magnet moving valve core 4, and the permanent magnet moving valve core 4 moves in another direction. The ink flow channel is opened or closed by controlling the movement of the permanent magnet moving valve core 4, thereby realizing the on-off control of the ink supply to the nozzle 1. When the electromagnetic coil 3 is energized in the forward direction, the permanent magnet moving valve core 4 moves in the direction away from the nozzle 1, and the nozzle 1 is in the open state. When the electromagnetic coil 3 is energized in the reverse direction, the permanent magnet moving valve core 4 moves in the direction of the nozzle 1 and blocks the nozzle 1, and the nozzle 1 is in the closed state. Therefore, by controlling the energization direction of the electromagnetic coil 3, the switch state of the nozzle can be controlled.

[0025] In actual production, the end of the nozzle body 6 away from the nozzle 1 is transparent, and then the permanent magnet moving valve core 4 and the return spring 5 are installed on it, and then the cover is covered and fixedly connected to form a whole.

[0026] According to a further optimized solution, the end of the permanent magnet moving valve core 4 close to the nozzle 1 and the end of the ink metering cavity 7 close to the nozzle 1 are both truncated cone-shaped and can fit tightly.

[0027] This frustum-shaped fitting surface can better block the flow path of the ink.

[0028] According to a further optimized solution, the nozzle body 6 is made of ABS material.

[0029] ABS material, that is, a thermoplastic polymer material, has the characteristics of high strength, corrosion resistance, and high temperature resistance, and can improve the strength of the nozzle body 6.

[0030] Further optimizing the solution, nozzle 1 is a gemstone nozzle.

[0031] The gem nozzle has the characteristics of high precision, good wear resistance, good anti-clogging and good spraying effect. It can not only improve the spraying effect, but also increase the service life.

[0032] According to a further optimization scheme, the permanent magnet movable valve core 4 is magnetized by a high-density magnetization method.

[0033] The high-density magnetization method can further reduce the volume of the permanent magnet moving valve core 4, reduce the mass, and help to improve the on-off speed of the nozzle.

[0034] The present invention may have various specifications depending on the application scenarios, which are mainly reflected in the different sizes of nozzle openings, different ink dot flow rates, and different ink pressures. When the nozzle opening is large, the ink pressure is high, and the ink dot flow rate is large, the corresponding flow channel will increase, and the corresponding moving valve core size will also increase, and the electromagnetic coil 3 also needs to be enlarged.

[0035] The switching speed of the utility model is related to the mass of the permanent magnet moving valve core 4, the magnetization density, and the current passing through the electromagnetic coil 3. The smaller the mass of the permanent magnet moving valve core 4, the higher the action speed; the stronger the magnetization density, the higher the action speed; the larger the electromagnetic coil current, the higher the action speed. In order to improve the quality of the printed ink dot morphology, the higher the action speed, the better. That is to say, when designing, under the premise of ensuring the normal operation of the permanent magnet moving valve core 4, it is necessary to reduce the mass of the permanent magnet moving valve core 4 as much as possible, increase the permanent magnet magnetization density, and increase the working current of the electromagnetic coil 3.

[0036] The ink supply of the utility model should be under pressure, and the pressure should be adapted to the requirements of the atomization effect of the nozzle.

[0037] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] The embodiments described above are only descriptions of the preferred methods of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the protection scope determined by the claims of the present invention.

Claims

1. A high-speed switching nozzle for an inkjet printer, characterized in that: include: A nozzle body (6), the nozzle body (6) is in a cylindrical structure as a whole, an ink quantitative cavity (7) is provided inside the nozzle body (6), the ink quantitative cavity (7) is a cylindrical cavity and the axis thereof coincides with the axis of the nozzle body (6); a nozzle (1) is embedded in the middle of one end of the nozzle body (6), the nozzle (1) is connected with the ink quantitative cavity (7); an ink injection interface (2) is provided on the nozzle body (6) at a position corresponding to the ink quantitative cavity (7) and at one end close to the nozzle (1), the ink injection interface (2) is connected with the ink quantitative cavity (7) The ink dosing cavity (7) is connected; a permanent magnet movable valve core (4) is slidably arranged in the ink dosing cavity (7); the permanent magnet movable valve core (4) is a cylinder and its side wall is sealed and slidably connected to the side wall of the ink dosing cavity (7); a return spring (5) is arranged in the ink dosing cavity (7) on the side of the permanent magnet movable valve core (4) away from the nozzle (1); one end of the return spring (5) is fixedly connected to the end face of the ink dosing cavity (7) and the other end is fixedly connected to the permanent magnet movable valve core (4); an electromagnetic coil (3) is fixedly sleeved at a position corresponding to the outer wall of the nozzle body (6) and the permanent magnet movable valve core (4).

2. The high-speed switching nozzle for an inkjet printer according to claim 1, characterized in that: The end surface of the permanent magnet movable valve core (4) close to the nozzle (1) and the end surface of the ink quantitative cavity (7) close to the nozzle (1) are both truncated cone-shaped and can fit tightly.

3. The high-speed switching nozzle for an inkjet printer according to claim 1, characterized in that: The nozzle body (6) is made of ABS material.

4. The high-speed switching nozzle for an inkjet printer according to claim 1, characterized in that: The nozzle (1) is a jewel nozzle.

5. The high-speed switching nozzle for an inkjet printer according to claim 1, characterized in that: The permanent magnet movable valve core (4) is magnetized by a high-density magnetization method.

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