Electrofluid nozzle with preheating function

Abstract

The utility model provides an electrofluid spray head with preheating function, which comprises a hollow spray head seat, a nozzle, a spiral flow guide pipe, a hot air supply device and a conductive wire, the hollow spray head seat comprises a hollow spray head main body and a sealing cover, the nozzle is arranged at the lower part of the hollow spray head main body, the spiral flow guide pipe is arranged in the hollow spray head main body, and the hot air supply device is arranged in the hollow spray head main body. A first air outlet pipe and a first air inlet pipe are arranged on the upper portion of the left side and the lower portion of the right side of the hollow nozzle body respectively, an annular air distribution pipe is arranged below the spiral flow guide pipe, a plurality of air distribution holes are formed in the annular air distribution pipe, and the hot air supply device can convey hot air to the first air inlet pipe. The flowing stroke of the printing ink in the spiral flow guide pipe is large, the flowing turbulence intensity is high, a certain heating time can be ensured while the printing ink is evenly heated, and therefore effective heating of the printing ink is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of current fluid spray head, specifically a current fluid spray head with preheating function. BACKGROUND

[0002] Electrohydrodynamic jet printing is a new high-resolution printing technology, in the printing process, the ink at the end of the needle is under the joint action of electric field force and gravity overcomes its own viscous force, surface tension and air resistance at the nozzle tip gathers into a meniscus and forms a Taylor cone under the action of electric field force, the local electric field of Taylor cone tip increases to form a jet, the liquid line feature size printed is 1 / 5 or even 1 / 10 of the nozzle diameter, thereby the structure and pattern required on the substrate surface direct writing forming, the process has the advantages of low cost, no contact, no template, high repeatability, low environmental requirement and simple operation.

[0003] For some high viscosity printing ink, its fluidity is poor under low temperature condition, which leads to unstable electrohydrodynamic jet printing and reduces the printing quality. At present, in order to realize the smooth flow of high viscosity printing ink in the electrohydrodynamic jet under low temperature environment, a heating element is generally arranged in the electrohydrodynamic jet to heat the printing ink, but because the delivery pipeline of printing ink in the electrohydrodynamic jet is short, the heating element has less heating time for the high-speed flowing printing ink in the high-speed printing process, which still causes the printing instability. UTILITY MODEL CONTENT

[0004] The utility model discloses a kind of electrofluidic spray heads with preheating function, the flow distance of printing ink in helical flow guide pipe is larger and flow turbulence intensity is big, it can also ensure certain heating time while being heated uniformly, to realize the effective heating of printing ink.

[0005] The utility model solves technical scheme which adopts technical scheme to solve its technical problem: a current fluid spray head with preheating function, including hollow spray head base, nozzle, spiral flow guide pipe, hot air flow supply device, conducting wire, the hollow spray head base includes hollow spray head main part and sealing cover, the sealing cover sets up in the upper portion of hollow spray head main part, the nozzle sets up in the lower portion of hollow spray head main part, the spiral flow guide pipe sets up in the hollow spray head main part, the spiral flow guide pipe liquid inlet end penetrates the sealing cover and is connected with ink delivery pipe, the liquid outlet end of spiral flow guide pipe is connected with the entering end of nozzle, in the left upper portion and right lower portion of hollow spray head main part are provided with a first air outlet pipe and first air inlet pipe respectively, the first air outlet pipe is connected with the inside of hollow spray head main part, an annular air distribution pipe is arranged below the spiral flow guide pipe, a plurality of air distribution holes are arranged on the annular air distribution pipe, the annular air distribution pipe is connected with the air outlet end of first air inlet pipe, the hot air flow supply device can deliver hot air flow to the first air inlet pipe, the conducting wire is penetrated in the hollow spray head base and nozzle, and one end of the conducting wire is exposed below the nozzle nozzle.

[0006] Preferably, the hot air flow supply device includes a heating box, a PTC air heater, a small air blower, a first temperature sensor, a second temperature sensor, a temperature controller, the PTC air heater is arranged in the heating box, the heating box is connected with the first air inlet pipe and the outlet of the small air blower through the first delivery pipeline and the second delivery pipeline respectively, the first temperature sensor is arranged in the left upper region of the hollow spray head main part, the second temperature sensor is arranged in the right lower region of the hollow spray head main part, and the temperature controller is electrically connected with the PTC air heater, the small air blower, the first temperature sensor and the second temperature sensor.

[0007] Further, a square rectifier tube is arranged between the first delivery pipe and the heating box, the square rectifier tube is connected with the first delivery pipe and the heating box, and a plurality of baffle plates are arranged in the square rectifier tube.

[0008] Further, a plurality of air distribution holes are distributed equidistantly along the circumferential direction of the annular air distribution pipe, and the air distribution holes are distributed above the inner ring wall of the annular air distribution pipe.

[0009] Further, the angle between the axis of the air distribution hole and the axis of the hollow spray head main part is 45 degrees.

[0010] Further, a first annular rubber plug is arranged in the middle of the sealing cover, and the upper part of the spiral flow guide pipe is arranged in the first annular rubber plug.

[0011] Further, a second annular rubber plug is arranged at the upper part of the nozzle, and the lower part of the spiral flow guide pipe is arranged in the second annular rubber plug.

[0012] Further, a silica aerogel heat insulation pad is arranged on the inner side wall of the hollow nozzle body.

[0013] Further, a third conveying pipe is connected through the gas outlet end of the first gas outlet pipe, and the gas outlet end of the third conveying pipe is connected through the air inlet pipe of the micro-blower.

[0014] The utility model discloses the beneficial effect is: the utility model discloses simple structure, convenient to process and manufacture, the conveying of printing ink is realized by utilizing spiral flow guide pipe, and then the flow distance of printing ink in the heating interval can be prolonged, and the flow distance increases, and the heating time can be prolonged under the condition that the flow speed is unchangeable, and the heating effect of printing ink can be improved by prolonging the heating time, and the printing stability of the electrofluidic nozzle is effectively ensured by effectively heating printing ink, the spiral flow guide pipe is spring spiral, and the turbulent intensity is larger when printing ink flows in it, and the turbulent intensity is larger, and the full mixing of printing ink is facilitated, thereby the uniform heating of printing ink in the flow process is facilitated, the full mixing of heated air is realized by utilizing the blocking effect of the plurality of baffles, thereby the temperature stability of heated air is improved, and the uniform heating of the spiral flow guide pipe is facilitated by utilizing the temperature uniform heating air, the heating effect of printing ink is ensured by the inclined distribution of the air distribution hole, the heated gas is collided with the side wall of the spiral flow guide pipe and the silica aerogel heat insulation pad, thereby the flowability of heated gas in the hollow nozzle body is increased, and then the rapid and sufficient diffusion of heated air in the hollow nozzle body is realized, thereby the uniform heating of the spiral flow guide pipe in the hollow nozzle body is facilitated, and the heating effect of printing ink is ensured, and the hot air of the first gas outlet pipe is directly returned to the air inlet pipe of the micro-blower and is heated again, and the hot air of the first gas outlet pipe has higher temperature, thereby the preheating of air in the air inlet pipe is realized, and the energy saving is realized. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are part of the preferred embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 It is the whole structure schematic diagram of the utility model,

[0017] Figure 2The partial structure longitudinal section view of the utility model;

[0018] Figure 3 The whole structure schematic diagram of spiral flow guide pipe is shown in the figure;

[0019] Figure 4 The whole structure schematic diagram of spiral flow guide pipe is shown in the figure; Figure 2 The enlarged view of A in the figure;

[0020] Figure 5 The whole structure schematic diagram of spiral flow guide pipe is shown in the figure; Figure 2 The enlarged view of B in the figure;

[0021] Figure 6 The plan view of square rectifier tube;

[0022] In the figure: 1 hollow nozzle seat, 11 hollow nozzle main body, 111 first air outlet pipe, 112 first air inlet pipe, 113 silica aerogel pad, 12 sealing cover, 121 first annular rubber plug, 2 nozzle, 21 second annular rubber plug, 3 spiral flow guide pipe, 31 liquid inlet end, 32 liquid outlet end, 41 heating box, 411 square rectifier tube, 412 baffle, 42 micro-blower, 421 air inlet pipe, 43 first temperature sensor, 44 second temperature sensor, 45 first conveying pipeline, 46 second conveying pipeline, 47 temperature controller, 5 annular air distribution pipe, 51 air distribution hole, 6 conductive wire. DETAILED DESCRIPTION

[0023] The specific embodiments and the drawings will be described below. Figures 1-6 The technical scheme in the utility model embodiment is clearly and completely described, obviously, the described embodiment is only a part of preferred embodiment of the utility model, not all the embodiment. The person skilled in the art can make similar deformation without violating the connotation of the utility model, therefore, the utility model is not limited by the specific embodiment disclosed below.

[0024] The utility model provides a kind of electric fluid nozzle with preheating function (such as Figure 1As shown, it comprises a hollow nozzle seat 1, a nozzle 2, a spiral flow guide pipe 3, a hot gas supply device, and a conductive wire 6. The hollow nozzle seat 1 comprises a hollow nozzle body 11 and a sealing cover 12 arranged on the upper part of the hollow nozzle body 11. In practical applications, the sealing cover 12 can be directly fixed on the upper part of the hollow nozzle body 11 by screw connection, and the sealing connection of the upper part of the hollow nozzle body 11 is realized by the sealing gasket arranged on the lower part of the sealing cover 12. The nozzle 2 is a commonly used technical product in the field of electrohydrodynamic printing, so the detailed structure of the nozzle 2 will not be introduced. The spiral flow guide pipe 3 is used to realize the flow delivery of printing ink. The spiral flow guide pipe 3 comprises a spring-shaped body and a liquid inlet end 31 and a liquid outlet end 32 arranged on the upper and lower parts thereof. The spiral flow guide pipe 3 can be processed from polytetrafluoroethylene material. The printing ink flows into the liquid inlet end 31, flows spirally in the spring-shaped body, and then flows out of the liquid outlet end 32. Under the condition that the flow rates are the same and the spring-shaped body and the vertical pipeline have the same height, the flow time of the printing ink in the spring-shaped body is longer than that in the vertical pipeline, so that the printing ink in the spring-shaped body can be heated for a longer period of time by using the secondary characteristic, thereby improving the heating effect of the printing ink. The nozzle 2 is arranged on the lower part of the hollow nozzle body 1. Specifically, the nozzle 2 can be fixed on the lower part of the hollow nozzle body 1 by screw connection. In the electrohydrodynamic printing process, the printing ink flows out of the nozzle 2. The spiral flow guide pipe 3 is arranged in the hollow nozzle body 11. The liquid inlet end 31 of the spiral flow guide pipe 3 penetrates through the sealing cover 12 and is connected with the ink delivery pipe. In order to realize the sealing connection between the sealing cover 12 and the liquid inlet end 31, a first annular rubber plug 121 is arranged in the middle part of the sealing cover 12. The liquid inlet end 31 is sealingly arranged in the first annular rubber plug 121. The liquid outlet end 32 of the spiral flow guide pipe 3 is connected with the inlet end of the nozzle 2. In order to realize the sealing connection between the liquid outlet end 32 and the upper part of the nozzle 2, a second annular rubber plug 21 is arranged on the upper part of the nozzle 2. The liquid outlet end 32 is sealingly arranged in the second annular rubber plug 21. A first gas outlet pipe 111 and a first gas inlet pipe 112 are arranged on the left upper part and the right lower part of the hollow nozzle body 11, respectively. The first gas outlet pipe 111 penetrates through the inside of the hollow nozzle body 11. An annular gas distribution pipe 5 is arranged below the spiral flow guide pipe 3. A plurality of gas distribution holes 51 are arranged on the annular gas distribution pipe 5. The annular gas distribution pipe 5 penetrates through the gas outlet end of the first gas inlet pipe 112. The hot gas supply device can deliver hot gas flow to the first gas inlet pipe 112.In practical application, the hot gas flow continuously enters into the annular air distribution pipe 5 from the first air inlet pipe 112, and diffuses into the hollow nozzle body 11 through the plurality of air distribution holes 51. The hot gas flow continuously flows upward in the hollow nozzle body 11 and finally discharges from the first air outlet pipe 111. In the process of flowing in the hollow nozzle body 11, the hot gas flow realizes the heating of the spiral flow guide pipe 3, and then synchronously realizes the heating of the printing ink flowing in the spiral flow guide pipe 3. Since the flow path of the printing ink in the spiral flow guide pipe 3 is long, the printing ink is heated for a long time, thereby effectively ensuring that the printing ink is fully heated. After the printing ink with high viscosity is fully heated, it can ensure good fluidity, thereby ensuring printing stability. Further, since the spiral flow guide pipe is in the shape of a spring spiral, the turbulent intensity of the printing ink flowing in it is large, which facilitates the full mixing and flow of the printing ink, thereby facilitating the uniform heating of the printing ink in the flow process. In practical application, in order to facilitate the annular air distribution pipe 5 to uniformly discharge the hot gas flow inside the hollow nozzle body 11, the air distribution holes 51 are equally spaced along the circumferential direction of the annular air distribution pipe 5. In order to facilitate the full diffusion of the hot gas flow in the hollow nozzle body 11, the air distribution holes 51 are distributed above the inner ring wall of the annular air distribution pipe 5. Specifically, the axis of the air distribution hole 51 and the axis of the hollow nozzle body 11 form an angle of 45 degrees. After the hot gas flow is obliquely sprayed from the air distribution hole 51, it collides with the spiral flow guide pipe 3 and the side wall of the hollow nozzle body 11, thereby increasing the flowability of the gas in the hollow nozzle body 11, and then facilitating the rapid and full diffusion of the heated gas flow in the hollow nozzle body 11, thereby ensuring the heating effect of the printing ink. Further, the conductive wire 6 penetrates the hollow nozzle seat 1 and the nozzle 2, and one end of the conductive wire 6 is exposed below the nozzle outlet of the nozzle 2. Specifically, the conductive wire 6 is a tungsten wire. A through hole is provided on the sealing cover 12 and the second annular rubber plug 21, and the conductive wire 6 is sealingly arranged in the through hole. The lower end of the conductive wire 6 penetrates the second annular rubber plug 21, is led out from the nozzle outlet below the nozzle 21, and is exposed below the nozzle outlet. In practical application, the conductive wire 6 and the printing substrate are respectively connected with the positive and negative electrodes of the direct current power supply, thereby forming an electric field between the conductive wire 6 and the substrate. The printing substrate is printed by using the effect of the electric field on the printing ink.

[0025] On the basis of the above-mentioned embodiment, the hot air supply device comprises a heating box 41, a PTC air heater, a small air blower 42, a first temperature sensor 43, a second temperature sensor 44, a temperature controller 47, the PTC air heater is a product known in the prior art, which can realize the heating of air, the temperature controller 47 is a basic product known in the prior art, which can be used to realize the operation control of the PTC air heater, and the temperature control range can be manually set thereon, the PTC air heater is arranged in the heating box 41, the heating box 41 is connected with the first air inlet pipe 112 and the outlet of the small air blower 42 through the first conveying pipe 45 and the second conveying pipe 46 respectively, in actual work process, when the small air blower 42 and the PTC air heater work, the hot air will continuously enter the first air inlet pipe 112, so as to heat the spiral flow guide pipe 3 in the hollow spray head body 11 by using the hot air, the first temperature sensor 43 is arranged on the left upper region of the hollow spray head body 11, and the second temperature sensor 44 is arranged on the right lower region of the hollow spray head body 11, in actual application, the first temperature sensor 43 and the second temperature sensor 44 are used to realize the real-time detection of the temperature of the upper side and the lower side of the hollow spray head body 11, the temperature controller 47 is electrically connected with the PTC air heater, the small air blower 42, the first temperature sensor 43 and the second temperature sensor 44, in actual application, the heating environment temperature control range of the hollow spray head body 11 can be set in the temperature controller 47, the average value of the two temperature values collected by the first temperature sensor 43 and the second temperature sensor 44 is taken as the temperature feedback parameter, the temperature controller 47 compares the temperature feedback parameter with the set temperature control range in real time, when the temperature feedback parameter is within the set temperature control range or exceeds the upper limit of the temperature control range, the temperature controller 47 sends a control signal of non-working to the PTC air heater and the small air blower 42, when the temperature feedback parameter is lower than the lower limit of the temperature control range, the temperature controller 47 sends a control signal of working to the PTC air heater and the small air blower 42, by using the above-mentioned stable control process, the temperature in the hollow spray head body 11 can be kept basically constant, so as to ensure the heating effect of the spiral flow guide pipe 3 in the hollow spray head body 11, and then ensure the heating effect of the printing ink.

[0026] On the basis of the above-mentioned embodiment, in order to make the temperature of the hot air flow inside the first air inlet pipe 112 uniformly distributed, here, a square flow regulating pipe 411 is arranged between the first conveying pipe 45 and the heating box 41, the square flow regulating pipe 411 is in through connection with the first conveying pipe 45 and the heating box 41, a plurality of front and back staggered baffles 412 are arranged in the square flow regulating pipe 411, the hot air flow flows in S shape under the blockage of the plurality of baffles 412, thereby facilitating the sufficient mixing and diffusion of the hot air flow, and then the temperature uniformity of the hot air flow in the first air inlet pipe 112 can be ensured, further, in order to realize energy saving, a third conveying pipe is in through connection with the air outlet end of the first air outlet pipe 111, the air outlet end of the third conveying pipe is in through connection with the air inlet pipe 421 of the micro-blower 42, the hot air flow flowing out of the first air outlet pipe 111 directly returns to the air inlet pipe 421 of the micro-blower 42 and is heated and utilized again, because the hot air flow flowing out of the first air outlet pipe 111 has a high temperature, thereby realizing the preheating of the air in the air inlet pipe 421, reducing the heat required when the cold air is heated again, thereby realizing energy saving.

[0027] On the basis of the above-mentioned embodiment, in order to improve the heat preservation property of the hollow nozzle main body 11, so as to realize energy saving, here, a ring-shaped silica aerogel heat preservation pad 113 is arranged on the inner side wall of the hollow nozzle main body 11.

[0028] In the utility model, "upper", "lower", "front", "rear", "left", "right" are all relative positions for the convenience of describing the positional relationship, and therefore cannot be understood as absolute positions for limiting the protection scope.

[0029] In addition to the technical features described in the specification, they are known technologies of the professional technicians.

[0030] The preferred embodiments and examples of the utility model are described in detail in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments and examples, and for ordinary technicians in the technical field, some improvements and modifications can be made without departing from the concept of the utility model, and these improvements and modifications should also be regarded as the protection scope of the utility model.

Claims

1. An electro-fluidic jet head with a preheating function, characterized by, The hollow nozzle seat, nozzle, spiral flow guide pipe, hot air supply device, conductive wire, the hollow nozzle seat includes a hollow nozzle body and a sealing cover, the sealing cover is arranged on the upper part of the hollow nozzle body, the nozzle is arranged on the lower part of the hollow nozzle body, the spiral flow guide pipe is arranged in the hollow nozzle body, the liquid inlet end of the spiral flow guide pipe is connected with the ink conveying pipe through the sealing cover, the liquid outlet end of the spiral flow guide pipe is connected with the inlet end of the nozzle, a first air outlet pipe and a first air inlet pipe are arranged on the left upper part and the right lower part of the hollow nozzle body respectively, the first air outlet pipe is connected with the inside of the hollow nozzle body, an annular air distribution pipe is arranged below the spiral flow guide pipe, a plurality of air distribution holes are arranged on the annular air distribution pipe, the annular air distribution pipe is connected with the air outlet end of the first air inlet pipe, the hot air supply device can convey hot air flow to the first air inlet pipe, the conductive wire is arranged in the hollow nozzle seat and the nozzle, and one end of the conductive wire is exposed below the nozzle outlet.

2. The fluid ejection head with pre-heat functionality of claim 1, wherein, The hot air supply device comprises a heating box, a PTC air heater, a small air blower, a first temperature sensor, a second temperature sensor, a temperature controller, the PTC air heater is arranged in the heating box, the heating box is connected with the first air inlet pipe and the outlet of the small air blower through the first conveying pipeline and the second conveying pipeline respectively, the first temperature sensor is arranged on the left upper part of the hollow nozzle body, the second temperature sensor is arranged on the right lower part of the hollow nozzle body, and the temperature controller is electrically connected with the PTC air heater, the small air blower, the first temperature sensor and the second temperature sensor.

3. The fluid ejection head with pre-heat functionality of claim 2, wherein the pre-heat functionality is implemented by the controller. A square rectifier pipe is arranged between the first conveying pipe and the heating box, the square rectifier pipe is connected with the first conveying pipe and the heating box, and a plurality of baffle plates are arranged in the square rectifier pipe.

4. The fluid ejection die of claim 3, wherein, A plurality of air distribution holes are distributed at equal intervals along the circumferential direction of the annular air distribution pipe, and the air distribution holes are distributed on the inner ring wall of the annular air distribution pipe.

5. The fluid ejection die of claim 4, wherein, The angle between the axis of the air distribution hole and the axis of the hollow nozzle body is 45 degrees.

6. The fluid ejection die of claim 4, wherein, A first annular rubber plug is arranged in the middle of the sealing cover, and the upper part of the spiral flow guide pipe is arranged in the first annular rubber plug.

7. The fluid ejection die of claim 4, wherein, A second annular rubber plug is arranged on the upper part of the nozzle, and the lower part of the spiral flow guide pipe is arranged in the second annular rubber plug.

8. The fluid ejection die of any of claims 5-7, wherein, A ring-shaped silica aerogel heat preservation pad is arranged on the inner side wall of the hollow nozzle body.

9. The fluid ejection die of claim 8, wherein, A third conveying pipe is connected with the air outlet end of the first air outlet pipe, and the air outlet end of the third conveying pipe is connected with the air inlet pipe of the small air blower.

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