A nozzle cooling device and a water-cooled double-sided spray plotter

Abstract

The application relates to the technical field of inkjet printing, and provides a nozzle cooling device and a water-cooled double-sided inkjet printer. The water-cooled double-sided inkjet printer comprises a nozzle device and a nozzle cooling device installed in the nozzle device. The nozzle cooling device comprises a channel and a cooling water pipe. The channel is arranged on the nozzle plate. The channel comprises an inlet end at one end and an outlet end at the other end. The channel is arranged at intervals around the nozzle in the circumferential direction. The cooling water pipe is embedded in the channel. The water inlet of the cooling water pipe corresponds to the inlet end of the channel. The water outlet of the cooling water pipe corresponds to the outlet end of the channel. The channel is arranged on the nozzle plate. The cooling water pipe is arranged in the channel and directly contacts the nozzle plate. The heat conduction efficiency of the cooling medium and the nozzle is improved. The nozzle is rapidly cooled, the temperature is reduced, and the printing precision of the nozzle is ensured.

Description

Technical Field

[0001] This application relates to the technical field of inkjet printing, specifically to a printhead cooling device and a water-cooled double-sided inkjet printer. Background Technology

[0002] As a crucial piece of equipment in the modern digital printing field, the stable operation of the inkjet printhead, its core component, has a decisive impact on printing accuracy. With the development of duplex synchronous printing technology, duplex printers achieve double-sided drying by incorporating heating devices on each printing unit. However, this structural innovation brings new technical challenges. Compared to traditional single-sided models, the number of radiative heat sources in a duplex structure is multiplied, and the internal operating temperature of the equipment is generally around 100℃ or even higher, exhibiting a continuous heat accumulation effect.

[0003] Existing heat dissipation technologies mainly employ two approaches: one is an exhaust system based on forced convection, but due to the uncontrollable nature of heat radiation conduction paths, it cannot effectively prevent near-field heat sources from reheating the printing unit; the other is a flat-plate water-cooling system based on conduction cooling. This approach embeds cooling pipes inside the printing platform substrate, which can reduce the surface temperature of the substrate, but the heat conduction path is spatially isolated from the printhead module, leaving the printhead assembly still exposed to a high-temperature radiation environment. Although both existing heat dissipation technologies have some cooling effect, they do not solve the problem of directional thermal management of the printhead itself, which has become a key technical bottleneck restricting the printing accuracy of duplex inkjet printers, thus requiring urgent improvement. Utility Model Content

[0004] In order to solve the problem of insufficient heat dissipation of the printhead body in the heat dissipation system of the inkjet printer, which affects the printing accuracy of the inkjet printer, this application proposes a printhead cooling device and a water-cooled double-sided inkjet printer.

[0005] The technical solution adopted in this application to solve the above-mentioned technical problems is as follows:

[0006] In a first aspect, a nozzle cooling device is provided for a nozzle assembly, the nozzle assembly including a nozzle plate and at least two nozzles disposed on the nozzle plate, the nozzle cooling device comprising:

[0007] The channel is disposed on the nozzle plate of the nozzle device, the channel includes an inlet end located at one end and an outlet end located at the other end, and the channel is spaced apart around the nozzle circumferentially.

[0008] Cooling water pipe, which is embedded inside the channel.

[0009] The nozzle plate is generally made of aluminum alloy, which has good thermal conductivity. It has grooves that allow the cooling water pipe to come into direct contact with the nozzle plate, thus improving the heat transfer efficiency.

[0010] Furthermore, the channel is arranged in an S-shape, and the channel starts from the inlet end or the outlet end and sequentially passes around the upper and lower sides of each nozzle in a first direction to form a continuous S-shaped winding path.

[0011] In this configuration, after the channel passes around the last nozzle, its other end extends in the opposite direction along the side of the nozzle that is not bypassed, forming a reversal section with both ends at the same position, thus creating a loop with a total length greater than the length of the straight bypass path.

[0012] Furthermore, the S-shaped, tongue-shaped channel's travel path around each nozzle includes:

[0013] A bend is formed above or below the odd-numbered nozzles;

[0014] A bend is formed on the side where the even-numbered nozzles bend in the opposite direction to the odd-numbered nozzles;

[0015] Spacing is achieved between each nozzle through equally spaced vertical channels.

[0016] Furthermore, the nozzle cooling device includes:

[0017] A chiller is placed outside the nozzle cooling device. The chiller includes an inlet and an outlet. The outlet of the chiller is connected to the inlet of the cooling water pipe, and the inlet of the chiller is connected to the outlet of the cooling water pipe.

[0018] The tank chain has one end attached to the housing and the other end attached to the nozzle device. Inside the tank chain is a cooling water pipe, located outside the nozzle device, for connection to the chiller. The tank chain protects the cooling water pipe located outside the nozzle device, and the cooling water pipe extends and retracts with the tank chain.

[0019] Furthermore, a tee is provided, which is used to connect the cooling water pipe to the chiller.

[0020] Secondly, a water-cooled double-sided inkjet printer is provided, comprising:

[0021] Two nozzle assemblies, each of which has at least two nozzles on its nozzle plate;

[0022] Such as any of the nozzle cooling devices mentioned above.

[0023] Furthermore, the water-cooled double-sided inkjet printer includes a frame, within which are arranged a first printing unit, a first adsorption platform, a second printing unit, and a second adsorption platform; the first and second printing units are equipped with printhead devices, the first adsorption platform is configured to cooperate with the spray end of the first printing unit, and the second adsorption platform is configured to cooperate with the spray end of the second printing unit.

[0024] Furthermore, the frame is equipped with a feeding roller and a receiving roller, which are positioned at both ends of the printing path.

[0025] Furthermore, the frame is provided with a number of guide rollers and a number of drive rollers, which are located between components in the printing path within the frame.

[0026] Furthermore, the frame is equipped with at least two heaters located at the output end of the printing unit.

[0027] Compared with the prior art, this application has the following beneficial effects:

[0028] This application provides a printhead cooling device for a printhead assembly with at least two printheads, including a channel and cooling water pipes. The channel is located on the printhead plate of the printhead assembly, and includes an inlet end at one end and an outlet end at the other end. The channel is spaced around the printhead circumferentially. The cooling water pipes are embedded inside the channel. By directly creating a channel on the printhead plate where the printheads are mounted and placing the cooling water pipes, the heat transfer efficiency between the cooling medium and the printhead is increased. The channel is arranged in an S-shape around each printhead on the printhead plate, and the cooling water pipes can be closely distributed around each printhead, shortening the heat transfer distance between the cooling medium and the printhead, further increasing the heat dissipation efficiency of the cooling device. When the printer is working, even if the heater is increased and the internal temperature of the printer rises, the printhead can still be effectively cooled, ensuring the printing accuracy of the printhead. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0030] Figure 1 This is a cross-sectional view of the printing unit of a water-cooled double-sided inkjet printer.

[0031] Figure 2 for Figure 1 The diagram shows the internal printhead cooling device and printhead assembly of the printing unit.

[0032] In the diagram: 1-Cooling device, 101-Channel, 102-Cooling water pipe, 103-Chiller, 2-Sprayer device, 201-Sprayer plate, 202-Sprayer, 402-First adsorption platform, 404-Second adsorption platform, 501-Paper feeding roller, 502-Paper taking roller, 601-Paper guide roller, 602-Drive roller, 701-Heater. Detailed Implementation

[0033] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and similar expressions used in this specification are for illustrative purposes only.

[0034] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0035] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0036] Please see Figures 1 to 2 One embodiment of this application provides a water-cooled double-sided inkjet printer, including a frame with two printhead devices 2 and a printhead cooling device 1 configured in conjunction with the printhead devices 2. Each printhead device 2 includes a printhead plate 201 and four printheads 202. The four printheads 202 are equidistantly mounted on the printhead plate 201. The printhead plate 201 is made of aluminum alloy, which has the advantage of good thermal conductivity. The printhead cooling device 1 includes a channel 101 and a cooling water pipe 102. The channel 101 is disposed on the printhead plate 201 and is configured to be distributed around the periphery of the printheads 202, including an inlet end and an outlet end. The cooling water pipe 102 is embedded inside the channel 101, with the inlet of the cooling water pipe 102 corresponding to the inlet end of the channel 101 and the outlet of the cooling water pipe 102 corresponding to the outlet end of the channel 101. The cooling water pipe 102 is directly embedded in the nozzle plate 201, so that the cooling medium and the nozzle plate 201 are in direct contact, and the distance between the medium and the nozzle 202 is closer, resulting in faster heat transfer and effectively improving the heat dissipation efficiency of the nozzle 202.

[0037] To further improve heat dissipation efficiency, the channel 101 is arranged in an S-shape. Starting from its outlet end, the channel 101 sequentially bypasses the upper and lower sides of each nozzle 202 in a first direction, forming a continuous S-shaped bypass path. After bypassing the last nozzle 202, the inlet end of the channel 101 extends in the opposite direction along the side of the nozzle that was not bypassed, forming a reversal section with both ends at the same position, thus creating a loop with a total length greater than the length of the straight bypass path. This design of the channel 101 allows the cooling water pipe 102 to surround the nozzle 202 to the maximum extent, maximizing heat transfer efficiency.

[0038] While ensuring that the heat transfer efficiency can be maximized, the heat dissipation efficiency of each nozzle 202 can be made as consistent as possible. The S-shaped grooves 101 arranged around each nozzle 202 include: forming a bend below the odd-numbered nozzles 202, forming a bend above the even-numbered nozzles 202, and achieving spatial transition between each nozzle 202 through equidistant vertical grooves 101.

[0039] In some other embodiments, the printhead cooling device 1 further includes a chiller, a tank chain, and a tee. The chiller is located outside the water-cooled double-sided inkjet printer and includes an inlet and an outlet. One end of the tank chain is located in the housing, and the other end is located in the printhead device 2. The tank chain has a cooling water pipe 102 located outside the printhead device 2 for connecting to the chiller. The outlet of the chiller and the inlets of the two cooling water pipes 102 are connected by a tee, and the inlet of the chiller is connected to the outlet of the two cooling water pipes 102 by a tee.

[0040] In some other embodiments, the frame of the printing equipment includes a first printing unit, a first adsorption platform 402, a second printing unit, and a second adsorption platform 404; the first printing unit and the second printing unit are provided with the nozzle device 2, the first adsorption platform 402 is configured to cooperate with the spray end of the first printing unit, and the second adsorption platform 404 is configured to cooperate with the spray end of the second printing unit.

[0041] The frame 301 also includes a feed roller 501 and a take-up roller 502, which are arranged at both ends of the printing path.

[0042] Furthermore, the frame also includes four guide rollers 601 and two drive rollers 602, which are arranged between components in the printing path.

[0043] Furthermore, the frame also includes two heaters 701, which are located at the output end of the printing unit.

[0044] When the water-cooled double-sided inkjet printer is working, the printing material is introduced by the feeding roller 501 and transferred to the first adsorption platform 402 via two consecutive guide rollers 601. The printhead 202 of the first printing unit prints the first side of the printing material. After the first side is printed, the printing material is flipped by the first drive roller 602 and then heated and dried by the heater 701. The printing material is then transferred to the second adsorption platform 404 via the third guide roller 601. The printhead 202 of the second printing unit prints the second side of the printing material. After printing, the printing material is flipped by the second drive roller 602 and the fourth guide roller 601 and transferred to the second heater 701 to heat and dry the printing surface. Finally, the printed material is discharged by the take-up roller 502.

[0045] Compared to existing technologies, in the embodiments of this utility model, the cooling device is used for a printhead assembly with at least two printheads, including a channel and a cooling water pipe. The channel is located on the printhead plate of the printhead assembly, and the channel includes an inlet end at one end and an outlet end at the other end. The channel is spaced around the printhead circumferentially. The cooling water pipe is embedded inside the channel. By directly opening a channel on the printhead plate where the printheads are installed and placing the cooling water pipe, the heat transfer efficiency between the cooling medium and the printhead is increased. The channel is arranged in an S-shape around each printhead on the printhead plate, and the cooling water pipe can be closely distributed around each printhead, shortening the heat transfer distance between the cooling medium and the printhead, further increasing the heat dissipation efficiency of the cooling device. When the inkjet printer is working, even if the heater is increased and the internal temperature of the inkjet printer rises, the printhead can still be effectively cooled, ensuring the printing accuracy of the printhead.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it; under the concept of this utility model, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of this utility model as described above, which are not provided in detail for the sake of brevity; although this utility model has been described in detail with reference to the foregoing embodiments, 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 essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A nozzle cooling device for a nozzle assembly (2), the nozzle assembly (2) comprising a nozzle plate (201) and at least two nozzles (202) disposed on the nozzle plate (201), characterized in that, The nozzle cooling device (1) includes: Channel (101), the channel (101) is provided on the nozzle plate (201), the channel (101) includes an inlet end located at one end and an outlet end located at the other end, and the channel (101) is circumferentially spaced around the nozzle (202); Cooling water pipe (102) is embedded inside the channel (101).

2. The nozzle cooling device (1) according to claim 1, characterized in that, The channel (101) is arranged in an S-shape. The channel (101) starts from the inlet end or the outlet end and passes around the upper and lower sides of each nozzle (202) in a first direction to form a continuous S-shaped bypass path. After the channel (101) passes around the last nozzle (202), its other end extends in the opposite direction along the side of the nozzle (202) that is not bypassed, forming a reversal section with both ends at the same position, thus forming a loop with a total length greater than the length of the straight bypass path.

3. The nozzle cooling device (1) according to claim 2, characterized in that, The S-shaped channel (101) has the following bypass path in each nozzle (202): A bend is formed above or below the odd-numbered nozzle (202); A bend is formed on the side where the even-numbered nozzle (202) bends in the opposite direction to the odd-numbered nozzle (202); Spatial transition is achieved between each nozzle (202) through equidistant vertical channels (101).

4. The nozzle cooling device (1) according to claim 1, characterized in that, include: A chiller is placed outside the nozzle cooling device (1). The chiller includes an inlet and an outlet. The outlet of the chiller is connected to the inlet of the cooling water pipe (102). The inlet of the chiller is connected to the outlet of the cooling water pipe (102). The tank chain has one end located in the housing and the other end located in the nozzle device (2). The tank chain has a cooling water pipe (102) located outside the nozzle device (2) for connecting to the chiller.

5. The nozzle cooling device (1) according to claim 4, characterized in that, A tee is provided, which is used to connect the cooling water pipe (102) to the chiller.

6. A water-cooled double-sided inkjet printer, characterized in that, include: Two nozzle devices (2), each of the nozzle devices (2) includes a nozzle plate (201) and at least two nozzles (202), the nozzles (202) being disposed on the nozzle plate (201); The nozzle cooling device (1) according to any one of claims 1-4.

7. A water-cooled double-sided inkjet printer according to claim 6, characterized in that, The water-cooled double-sided inkjet printer includes a frame, and the frame is provided with a first printing unit, a first adsorption platform (402), a second printing unit and a second adsorption platform (404); the first printing unit and the second printing unit are provided with a nozzle device (2), the first adsorption platform (402) is set in conjunction with the spray end of the first printing unit, and the second adsorption platform (404) is set in conjunction with the spray end of the second printing unit.

8. A water-cooled double-sided inkjet printer according to claim 7, characterized in that, The frame is equipped with a feeding roller (501) and a receiving roller (502), which are arranged at both ends of the printing path.

9. A water-cooled double-sided inkjet printer according to claim 7, characterized in that, The frame is provided with a number of guide rollers (601) and a number of drive rollers (602), which are located between components in the printing path within the frame.

10. A water-cooled double-sided inkjet printer according to claim 7, characterized in that, The frame is provided with at least two heaters (701), which are located at the output end of the printing unit.

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