CN109703023A - Electric field driven formula droplet ejection spray head based on pyroelectric effect - Google Patents
Electric field driven formula droplet ejection spray head based on pyroelectric effect Download PDFInfo
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- CN109703023A CN109703023A CN201910062836.7A CN201910062836A CN109703023A CN 109703023 A CN109703023 A CN 109703023A CN 201910062836 A CN201910062836 A CN 201910062836A CN 109703023 A CN109703023 A CN 109703023A
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Abstract
The invention discloses a kind of electric field driven formula droplet ejection spray head based on pyroelectric effect, the injection spray head include material storage tube, nozzle, pyroelectric crystal ring, heating ring and shell；The nozzle is provided with below the material storage tube, which is taper；Within the material storage tube and nozzle with external insulation；The pyroelectric crystal ring is ring structure, and installs on the housing and be located at the underface of the nozzle, the injection liquid equipotential in the outer ring surface of the pyroelectric crystal ring and the material storage tube；The heating ring is located at the periphery of the pyroelectric crystal ring, and heats to pyroelectric crystal ring；The shell is fixed on the outside of the material storage tube.The problem of one aspect of the present invention can avoid problems caused by high voltage and complicated circuit needed for directly applying external electric field, on the other hand also can solve by gap size between pyroelectric crystal and injection apparatus to jet printing process stability influence.
Description
Technical field
The present invention relates to increasing material manufacturings and droplet ejection technology field, more particularly, to a kind of electricity based on pyroelectric effect
Field drive-type droplet ejection spray head.
Background technique
Droplet ejection device can be applied to MEMS manufacturing technology, Electronic Encapsulating Technology, display fabrication techniques
And the multiple fields such as inkjet printer technologies.Currently, droplet ejection device is commonly divided into according to its ejector principle difference
The injection of " pushing away " formula and the injection of " drawing " formula.The injection of " pushing away " formula is to go out the liquid injection in spray chamber by driving diaphragm etc.,
Structure is relatively easy.And the injection of " drawing " formula is a kind of injection method based on electric field driven, also known as EFI prints, and can reach nanometer
The resolution ratio of grade, but in electric Printing techniques, electric field is usually driven by additional voltage, it is therefore desirable to be equipped with high voltage arteries and veins
Power supply is rushed, while printing substrate connection power supply, as anode therein (or cathode), structure is complicated.Simultaneously as electrode and spray
Gap between injection device needs to be controlled by telecontrol equipment, and the accurate control of gap size depends on telecontrol equipment,
Therefore the application of its stability and the injection of complex surface pattern is by larger limitation.
" a kind of coaxial jet head for electro-hydrodynamic jet printing and its application " disclosed in CN201110164601.2,
" a kind of electric field driven jet deposition 3D printing device and its working method " disclosed in CN201710528176.8,
" a kind of electric field driven molten metal jet deposition 3D printing device and its working method " disclosed in CN201710524040.X,
" a kind of electric field driven melting jet deposition 3D printing device and its working method " etc. disclosed in CN201710527914.7,
For the device and method of electric Printing techniques.
Problems caused by high voltage needed for needing to apply electric field for traditional electric Printing techniques and complicated circuit, this
Case inventor develops a kind of nanojet technology that strong electrical field is generated based on pyroelectric effect, i.e. CN201510380447.0 is public
The one kind " nanojet based on pyroelectric effect-micro-nano composite injection device and its control method " opened.
Pyroelectric effect refers to the charge release phenomenon that polarization intensity changes with temperature and shows, for self start type
Polarized crystal, when crystal is heated or it is cooling after, due to temperature variation (△ T) and cause self start type polarization intensity to change (△
It Ps), is macroscopically that the change of temperature makes to occur at the both ends of material to generate Surface Polarized Charge in crystal certain orientation
Voltage generates electric current.
But the existing injection apparatus using pyroelectric effect needs to carry out the gap between nozzle and pyroelectric crystal
Control, to guarantee the stability of the electric field intensity signal between nozzle and pyroelectric crystal.Therefore, for existing electric field driven
Decline the deficiency of drop ejection device, needs to design a kind of injection apparatus, height needed on the one hand can avoid directly application external electric field
On the other hand problems caused by voltage and complicated circuit also can solve by gap between pyroelectric crystal and injection apparatus
The problem of size is to jet printing process stability influence.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of electric field driven based on pyroelectric effect to decline drop spray
Spray head is penetrated, one side can avoid problems caused by high voltage and complicated circuit needed for directly applying external electric field, another
Aspect also can solve by gap size between pyroelectric crystal and injection apparatus the problem of to jet printing process stability influence.
In order to solve the above technical problems, the technical solution of the invention is as follows:
A kind of electric field driven formula droplet ejection spray head based on pyroelectric effect, including material storage tube, nozzle, pyroelectric crystal ring,
Heat ring and shell；The nozzle is provided with below the material storage tube, which is taper；Within the material storage tube and nozzle with outside
Boundary's insulation；The pyroelectric crystal ring is ring structure, and installs on the housing and be located at the underface of the nozzle, the heat
The outer ring surface for releasing transistor ring and the injection liquid equipotential in the material storage tube；The heating ring is located at the pyroelectric crystal ring
Periphery, and pyroelectric crystal ring is heated；The shell is fixed on the outside of the material storage tube.
Preferably, an inner core is provided on the material storage tube axis, the lower end of the inner core is stretched out from the nozzle, and
Positioned at the surface of the pyroelectric crystal ring.
Preferably, the pyroelectric crystal ring is conical ring.
Preferably, electrode is provided in the material storage tube；The outer ring surface of the pyroelectric crystal ring, which is also equipped with, leads
Electrode, the conductive electrode are connect by conducting wire with the electrode, and the outer ring of the liquid and pyroelectric crystal ring in material storage tube is made
Face equipotential.
Preferably, material storage tube top is provided with the crossbeam inside and outside material storage tube, is provided with connection in the crossbeam
Hollow structure inside and outside material storage tube, the electrode are fixed on the crossbeam, and are connected a terminals I and reached outside by hollow structure
Portion；The conductive electrode of the pyroelectric crystal ring outer ring surface setting connects the terminals I by conducting wire.
Preferably, it is fixed with an inner core on the crossbeam of the material storage tube, which is overlapped with the axis of material storage tube；And this is interior
The lower end of core is stretched out from the nozzle, and is located at the surface of the pyroelectric crystal ring.
Preferably, the shell includes inner casing, connection sleeve and support portion；The inner casing tight fit is fixed in the storage
On the outside of barrel, the connection sleeve is by thread bush on the outside of the inner casing；The support portion is fixed by screws under the connection sleeve
Side；Inside is equipped with annular groove among the support portion, and the pyroelectric crystal ring and heating ring are mounted within the annular groove.
Preferably, it is further provided with an annular heat layer, the annular inboard of the thermal insulation layer is equipped with annular groove, described
Heating ring be set in the annular groove, the pyroelectric crystal ring is on the inside of the thermal insulation layer.
Preferably, the pyroelectric crystal ring is conical ring, in the annular groove of the support portion and annular heat layer
Anchor ring is taper anchor ring, and the pyroelectric crystal ring of the tapered annular is mounted in the taper anchor ring that thermal insulation layer and support portion are propped up jointly
On.
Preferably, the material storage tube is made of insulating materials, and the inner casing and connection sleeve use metal material system
At the support portion is made of insulating materials.
After adopting the above scheme, the invention has the following beneficial effects:
The present invention is a kind of electric field driven formula droplet ejection spray head based on pyroelectric effect, nozzle and pyroelectric crystal ring it
Between form strong electrical field, thus drop from nozzle liquid level pull out, without injection substrate add high voltage；In addition, the present invention is straight
Connect and be fixed on pyroelectric crystal ring immediately below nozzle by nozzle housing, become a part of spray head and as nozzle one starts shipment
It is dynamic, do not have to consider that influence of the gap variation to print quality, jet printing process are steady between nozzle and pyroelectric crystal in print procedure
It is fixed.
In addition, an inner core can be further arranged in the present invention in storage cavity, being provided with for the inner core is conducive in jet hole
Fine droplet is formed, limits the liquid-drop diameter sprayed by nozzle diameter, and viscosity of the larger liquid can be sprayed.
Detailed description of the invention
Fig. 1 is the perspective view of injection spray head of the present invention；
Fig. 2 is the sectional view of injection spray head of the present invention；
Fig. 3 is the pyroelectric crystal ring of injection spray head of the present invention and the top cross-sectional view for heating ring；
Fig. 4 is the structural schematic diagram that the present invention is applied to injection apparatus.
Specific embodiment
The invention will be further described in the following with reference to the drawings and specific embodiments.
Disclosed is a kind of electric field driven formula droplet ejection spray head based on pyroelectric effect, such as Fig. 1 to Fig. 3
It is shown, it is the preferred embodiment of droplet ejection spray head of the present invention.The injection spray head 1 includes material storage tube 101, nozzle
102, electrode 103, pyroelectric crystal ring 104, heating ring 105 and shell.Wherein:
The nozzle 102 is provided with below the material storage tube 101, the integral structure that the two can be integrally formed can also
To be seperated interconnection structure, which is taper.
The electrode 103 is arranged in the material storage tube 101, specifically, being provided with cross above the material storage tube 101
Beam 106 is inside and outside material storage tube 101, and setting is connected to the hollow structure inside and outside material storage tube 101 in crossbeam 106, and the electrode 103 is solid
It is scheduled on crossbeam 106, and connects a terminals I and externally protruded by hollow structure.
The pyroelectric crystal ring 104 is ring structure, specifically, can be conical ring.The pyroelectric crystal ring 104
Installation is on the housing and positioned at the underface of the nozzle 102.The outer ring surface of the pyroelectric crystal ring 104 is provided with conduction
Electrode (not shown), the conductive electrode are connect with the electrode 103 in material storage tube 101 by conducting wire, are made in material storage tube 101
The outer ring surface equipotential of liquid and pyroelectric crystal ring 104.Specifically, terminals I can be directly wired to, and it is described
104 outer ring surface of pyroelectric crystal ring the conductive adhesive attachment conductive electrode can be used.As long as in fact, making storing
Liquid in cylinder 101 is equal with the outer ring surface potential of pyroelectric crystal ring 104, can also be realized using other modes.
The heating ring 105 is also mounted on the shell, and is located at the periphery of the pyroelectric crystal ring 104.
The heating ring 105 makes pyroelectric crystal ring 104 generate pyroelectric effect to heat to pyroelectric crystal ring 104.It should add
Hot ring 105 can be heated using resistance wire mode or other heating methods.It can be arranged on the support portion 109 in perforation
Outer through-hole, the terminals II that the interior setting of through-hole is connect with resistance wire, the terminals II pass through conducting wire and power supply 3(referring to fig. 4)
Connection.
The shell is fixed in the outside of the material storage tube 101.Specifically, the shell may include inner casing 107,
Connect sleeve 108 and support portion 109；107 tight fit of inner casing is fixed in 101 outside of material storage tube, the connection sleeve 108
By thread bush in 107 outside of inner casing, to guarantee that two parts axial line is overlapped；The support portion 109 is solid by screw 113
It is scheduled on 108 lower section of connection sleeve；Inside is equipped with annular groove 110, the pyroelectric crystal ring 104 among the support portion 109
And heating ring 105 is mounted within the annular groove 110.In addition, being further provided with an annular heat layer 111, the thermal insulation layer
111 annular inboard is equipped with annular groove, and the heating ring 105 is set in the annular groove, the pyroelectric crystal ring
104 mounted in 111 inside of thermal insulation layer.For the pyroelectric crystal ring 104 of tapered annular, the annular groove of the support portion 109
110 with 111 inner ring surface of annular heat layer be taper anchor ring, and the pyroelectric crystal ring 104 of the tapered annular is mounted in 111 He of thermal insulation layer
On the taper anchor ring that support portion 109 is propped up jointly.
Since the injection liquid in material storage tube 101 is conducting liquid, in order not to allow the charged liquid to be connected to external electrical field,
Liquid need and external insulation in the material storage tube 101.For this purpose, material storage tube 101 and shell at least answer one to be made of insulating materials.This
Case embodiment, the material storage tube 101 use insulating materials, and the inner casing 107 and connection sleeve 108 can use metal material
Material is to facilitate thread making, and support portion 109 need to use insulating materials, so as not to allow charged liquid to connect 107 He of inner metal shell
Sleeve 108 is connected, to make nozzle 102 without voltage.
In addition, an inner core 112 can further be arranged on 101 axis of material storage tube, 112 lower end of inner core is from institute
The nozzle 102 stated stretches out, and is located at the surface of the pyroelectric crystal ring.The inner core 112 is arranged to be conducive in the nozzle degree of lip-rounding
At fine droplet, limit the liquid-drop diameter sprayed by nozzle diameter, and viscosity of the larger liquid can be sprayed.The inner core
112 can be fixed on the crossbeam 106, and be overlapped with the axis of material storage tube 101.
The working principle of the droplet ejection spray head 1 are as follows: feeding device 2(is referring to fig. 4) certain feed power is provided,
So that injection liquid is entered material storage tube 101 and nozzle 102, and forms tiny arc liquid level outstanding, Huo Zhe in the outlet of nozzle 102
112 lower prong of inner core forms tiny arc liquid level outstanding；After power supply is started to work, heating ring 105 starts to pyroelectric crystal
Ring 104 heats, and pyroelectric crystal ring 104 is because temperature change outer ring surface and inner ring surface generate potential difference, since its outer ring surface connects
Electrode 103, electrode 103 make the arc liquid level at nozzle 102 equal with outer ring surface potential；The liquid of conducting liquid at nozzle 102
Because potential difference forms strong electrical field between face and pyroelectric crystal ring 104；The arc liquid level of conducting liquid is because charging by strong electrical field
The effect of power is drawn out and is detached from liquid level formation droplet；Droplet is acted on by electric field force and is accelerated, and is sprayed with certain speed from injector head
Injection is beaten on the substrate of underface.
Injection spray head of the present invention can be applied to droplet ejection device, as shown in figure 4, filling for the droplet ejection
The structural schematic diagram set.The droplet ejection device includes injection spray head 1, feeding device 2, power supply 3, two-dimension moving platform 4, Z-direction
Motion platform 5, workbench 6, substrate stage 7 and control unit (not shown) etc..Wherein:
The injection spray head 1 is fixed on the exercise stress 501 of Z-direction motion platform 5 by fixture 502.The injection spray head 1 with
Feeding device 2 communicates, specifically, the top of the injection spray head 1 connects a connection valve 11, connection valve 11 and 12 phase of a conveying pipeline
Even, conveying pipeline 12 is connected with the inlet of feeding device 2, in this way, the injection spray head 1 and feeding device 2 just pass through connection valve 11
It is connected with conveying pipeline 12.
The feeding device 2 is connected with control unit, and feeding device 2 can provide feed pressure, and pressure can be manual
It adjusts, can also be automatically adjusted by control unit, which is the prior art, and specific structure is no longer described in detail.It should
Feeding device 2 can be fixed on workbench 6, can be specifically fixed on the gantry frame structure platform 602 of workbench 6,
The pressure in material storage tube 101 in order to control injection spray head 1.
The power supply 3 is that injection spray head 1 provides DC voltage, connects heating ring 105 by conducting wire, it can by leading
Line is attached with terminals II.The power supply 3 is connected with control unit again, can manually adjust output voltage, can also be with
It is automatically adjusted by control unit.
The two-dimension moving platform 4 is fixed on workbench 6, can be fixed on the horizontal table of workbench 6
On 601.The two-dimension moving platform 4 includes X-axis motion platform 401 and Y-axis motion platform 402, respectively by X-axis motor 403 and Y-axis
Motor 404 drives.
The Z-direction motion platform 5 is also secured on workbench 6, can be fixed on the gantry frame structure of workbench 6
The middle part of platform 602.The exercise stress 501 of the Z-direction motion platform 5 is driven by Z axis motor 503.
The workbench 6 is for installing each component, specifically, the workbench 6 may include horizontal table 601
With the gantry frame structure platform 602 being arranged on the horizontal table 601.
The substrate stage 7 is arranged on the Y-axis motion platform 402 of two-dimension moving platform 4.
Do not provided in the control unit figure, with the X-axis motor 403 of two-dimension moving platform 4 and y-axis motor 404 with
And the Z axis motor 503 of Z-direction motion platform 5 is connected, and can control entire motion platform according to specific setting movement, realizes accurate
Patterning.The control unit is also connected with the feeding device 2 and power supply 3, while controlling entire injection apparatus.
The working principle of the droplet ejection device is: when control unit is started to work, first passing through control X-axis motor
403, y-axis motor 404 controls two-dimension moving platform 4 and resets to work origin, and control Z axis motor 503 makes under Z-direction workbench 5
Reach required distance between the substrate dropped on nozzle 102 and substrate stage 7；Meanwhile it controlling feeding device 2 and starting output spray
Liquid is penetrated, injection liquid enters injection spray head 1 by perfusion tube 12；Meanwhile it controlling power supply 3 and powering to injection spray head 1.Spray liquid
Body from injection spray head 1 eject beat on the substrate on substrate stage 7, two-dimension moving platform 4 according to setting Sequence motion,
Pattern needed for being formed on substrate, until one layer of injection terminates.Continue to spray or print the second layer or multilayer if necessary, the
Secondary printing is printed using first time printable layer as substrate, is so recycled, until forming final three-dimensional structure.
The above described is only a preferred embodiment of the present invention, be not intended to limit the scope of the present invention,
Therefore the changes or modifications that claim under this invention and specification are done in every case, it all should belong to the range that the invention patent covers
Within.
Claims (10)
1. a kind of electric field driven formula droplet ejection spray head based on pyroelectric effect, it is characterised in that: including material storage tube (101),
Nozzle (102), pyroelectric crystal ring (104), heating ring (105) and shell；The spray is provided with below the material storage tube (101)
Mouth (102), the nozzle are taper；Within the material storage tube (101) and nozzle (102) with external insulation；The pyroelectric crystal ring
(104) it is ring structure, and installs on the housing and be located at the underface of the nozzle (102), the pyroelectric crystal ring
Outer ring surface and the material storage tube (101) in injection liquid equipotential；The heating ring (105) is located at the pyroelectric crystal ring
(104) periphery, and pyroelectric crystal ring is heated；The shell is fixed on the outside of the material storage tube (101).
2. the electric field driven formula droplet ejection spray head according to claim 1 based on pyroelectric effect, it is characterised in that: institute
It is provided with an inner core (112) on material storage tube (101) axis stated, the lower end of the inner core is stretched out from the nozzle (102), and position
In the surface of the pyroelectric crystal ring (104).
3. the electric field driven formula droplet ejection spray head according to claim 1 based on pyroelectric effect, it is characterised in that: institute
The pyroelectric crystal ring (104) stated is conical ring.
4. the electric field driven formula droplet ejection spray head according to claim 1 based on pyroelectric effect, it is characterised in that: institute
Electrode (103) are provided in the material storage tube (101) stated；The outer ring surface of the pyroelectric crystal ring (104) is also equipped with conduction
Electrode, the conductive electrode are connect by conducting wire with the electrode (103), and the liquid and pyroelectric crystal in material storage tube (101) are made
The outer ring surface equipotential of ring (104).
5. the electric field driven formula droplet ejection spray head according to claim 4 based on pyroelectric effect, it is characterised in that: institute
Material storage tube (101) top stated is provided with the crossbeam (106) inside and outside material storage tube, is provided with connection material storage tube in the crossbeam
(101) hollow structure inside and outside, the electrode (103) are fixed on the crossbeam (106), and connect a terminals I by hollow knot
Structure externally protrudes；The conductive electrode of pyroelectric crystal ring (104) the outer ring surface setting connects the terminals I by conducting wire.
6. the electric field driven formula droplet ejection spray head according to claim 5 based on pyroelectric effect, it is characterised in that: institute
It states and is fixed with an inner core (112) on the crossbeam (106) of material storage tube (101), which is overlapped with the axis of material storage tube (101)；And
The lower end of the inner core is stretched out from the nozzle (102), and is located at the surface of the pyroelectric crystal ring (104).
7. the electric field driven formula droplet ejection spray head according to claim 1 based on pyroelectric effect, it is characterised in that: institute
The shell stated includes inner casing (107), connection sleeve (108) and support portion (109)；Inner casing (107) tight fit is fixed in institute
It states on the outside of material storage tube (101), the connection sleeve (108) is by thread bush on the outside of the inner casing (107)；The support portion (109) is logical
Screw (113) is crossed to be fixed below the connection sleeve (108)；The intermediate inside of the support portion (109) is equipped with annular groove (110), institute
The pyroelectric crystal ring (104) and heating ring (105) stated are mounted within the annular groove (110).
8. the electric field driven formula droplet ejection spray head according to claim 7 based on pyroelectric effect, it is characterised in that: into
One step is provided with an annular heat layer (111), and the annular inboard of the thermal insulation layer is equipped with annular groove, the heating ring
(105) it is set in the annular groove, the pyroelectric crystal ring (104) is on the inside of the thermal insulation layer (111).
9. the electric field driven formula droplet ejection spray head according to claim 8 based on pyroelectric effect, it is characterised in that: institute
The pyroelectric crystal ring (104) stated is conical ring, annular groove (110) and annular heat layer (111) of the support portion (109)
Inner ring surface is taper anchor ring, and the pyroelectric crystal ring (104) of the tapered annular is total mounted in thermal insulation layer (111) and support portion (109)
With on the taper anchor ring propped up.
10. the electric field driven formula droplet ejection spray head according to claim 7 based on pyroelectric effect, it is characterised in that:
The material storage tube (101) is made of insulating materials, and the inner casing (107) and connection sleeve (108) use metal material system
At the support portion (109) is made of insulating materials.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910062836.7A CN109703023B (en) | 2019-01-23 | 2019-01-23 | Electric field driving type droplet ejection nozzle based on pyroelectric effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910062836.7A CN109703023B (en) | 2019-01-23 | 2019-01-23 | Electric field driving type droplet ejection nozzle based on pyroelectric effect |
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| CN109703023A true CN109703023A (en) | 2019-05-03 |
| CN109703023B CN109703023B (en) | 2021-02-19 |
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