CN116237190A - Jetting device for high-viscosity liquid - Google Patents

Jetting device for high-viscosity liquid Download PDF

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Publication number
CN116237190A
CN116237190A CN202310390347.0A CN202310390347A CN116237190A CN 116237190 A CN116237190 A CN 116237190A CN 202310390347 A CN202310390347 A CN 202310390347A CN 116237190 A CN116237190 A CN 116237190A
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China
Prior art keywords
liquid
sealing block
vibrating plate
outlet
viscosity liquid
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CN202310390347.0A
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Chinese (zh)
Inventor
黄正英
漆正兴
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Jiangxi Shengzhuo Technology Co ltd
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Jiangxi Shengzhuo Technology Co ltd
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Priority to CN202310390347.0A priority Critical patent/CN116237190A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B17/00—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups
    • B05B17/04—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods
    • B05B17/06—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations
    • B05B17/0607—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers
    • B05B17/0638—Apparatus for spraying or atomising liquids or other fluent materials, not covered by the preceding groups operating with special methods using ultrasonic or other kinds of vibrations generated by electrical means, e.g. piezoelectric transducers spray being produced by discharging the liquid or other fluent material through a plate comprising a plurality of orifices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

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Abstract

The invention belongs to the field of spraying devices, and particularly relates to a spraying device for high-viscosity liquid. Comprises a syringe, a pipeline, a connector, a matrix and a liquid drop generator; the inner cavity is filled with high-viscosity liquid; the liquid drop generator sprays high-viscosity liquid into tiny liquid drops and ejects the tiny liquid drops from the second outlet; the pipeline is communicated with a first outlet of the injector and a second inlet of the liquid drop generator; the coupler connects the first outlet of the syringe and the tubing; the substrate is used for the mounting of the drop generator. Features and advantages: low power consumption, simple structure and easy integration.

Description

Jetting device for high-viscosity liquid
Technical Field
The invention belongs to the field of spraying devices, and particularly relates to a spraying device for high-viscosity liquid.
Background
Spraying liquids into tiny droplets is an important liquid delivery device, such as a pesticide sprayer. The piezoelectric drive has the advantages of simple structure, low power consumption, low cost and no electromagnetic interference, and has wide application prospect in the liquid injection device. However, the realization of the piezoelectric driven jetting device is difficult due to the high viscosity of the high viscosity liquid.
Disclosure of Invention
Aiming at the defects of complex structure, high cost and high power consumption of the existing liquid spraying device, the invention provides a spraying device for high-viscosity liquid.
The embodiment of the invention provides a high-viscosity liquid spraying device, which comprises: a syringe having a compression spring, a piston, an inner chamber, a first outlet; the inner cavity is filled with high-viscosity liquid; the compression spring has a certain compression amount, and pushes the piston and gives a certain pressure to the liquid in the inner cavity; the piston is provided with a sealing ring to ensure the tightness; a droplet generator provided with a piezoelectric vibrator, a driving chamber, a vibration plate, a sealing block, a second inlet and a second outlet; a conduit communicating the first outlet of the injector with the second inlet of the drop generator; a coupler detachably connecting the first outlet of the syringe and the pipe; a base for mounting the drop generator.
Further, the droplet generator converts the high viscosity liquid into fine droplets and ejects the droplets from the second outlet. The liquid drop generator takes a substrate as a substrate, and is provided with a piezoelectric vibrator, a sealing block and a vibrating plate from top to bottom; the piezoelectric vibrator, the matrix and the vibrating plate are sequentially connected to form a driving cavity; the second inlet is communicated with the driving cavity; the vibrating plate is a metal sheet; a plurality of groups of micropores arranged in an array are arranged at the center of the vibrating plate; the upper surface of the sealing block is concentrically adhered with the piezoelectric vibrator, the lower surface of the sealing block is contacted with the upper surface of the vibrating plate and completely covers the micropore area in the center of the vibrating plate, and the sealing block has extrusion force on the vibrating plate, so that leakage of the injected liquid can be prevented; the sealing block is made of elastic materials, such as silica gel; the piezoelectric vibrator is formed by concentrically bonding piezoelectric ceramics and a metal substrate; the radial outer edge of the piezoelectric vibrator is connected with the matrix; the radial outer edge of the vibration plate is connected with the base body.
Further, the micropores are tapered holes with the sectional diameters gradually reduced from top to bottom, θ is the taper angle of the micropores, t is the thickness of the platform, and D is the sectional diameter of the large end of the micropores. The micropore taper angle theta is in the range of 40 DEG to 60 DEG, the thickness t is in the range of 0.05mm to 0.20mm, and the large-end section diameter D is in the range of 3 mu m to 15 mu m.
Further, the lower surface of the sealing block is sequentially provided with a contact surface and an extrusion cavity from outside to inside; the contact surface is contacted with the vibrating plate, and the contact part of the contact surface and the vibrating plate surrounds the micropore area, so that the micropore can be sealed when the micropore is not in operation; the extrusion chamber stores liquid for injection; a conical surface with central symmetry is arranged in the extrusion cavity; the depth of the conical surface is gradually reduced from inside to outside, so that the driving force of the piezoelectric vibrator can be focused on a central liquid area, and the spraying effect of liquid can be improved.
When no driving voltage is applied, the piezoelectric vibrator is in a non-deformation state, and the sealing block is in a pressed state, namely an initial state of the liquid drop generator; when voltage opposite to the polarization direction of the piezoelectric ceramic is applied, the piezoelectric vibrator bends upwards to deform, the piezoelectric vibrator drives the sealing block to be separated from contact with the vibrating plate, gaps are formed between the sealing block and the platform, and high-viscosity liquid fills the gaps between the sealing block and the platform under the action of the compression spring, so that the liquid drop generator is in a first working state; when the voltage with the same polarization direction as the piezoelectric ceramic is applied, the piezoelectric vibrator bends downwards to deform, the piezoelectric vibrator drives the sealing block to contact with the vibrating plate again and extrudes high-viscosity liquid in a gap between the sealing block and the vibrating plate, and the high-viscosity liquid is ejected from the micropores, namely a second working state diagram of the liquid drop generator; under the drive of alternating voltage signal, piezoelectric vibrator and vibrating plate co-operate and seal the piece and constantly squeeze liquid and spout the liquid droplet from micropore.
Further, the micropores are taper holes of micron order, and can realize unidirectional injection of micro liquid drops under the action of liquid surface tension, the action of flow resistance difference of expansion opening and contraction opening (the conversion of expansion opening and contraction opening is shown by the micropores relative to liquid in the process of up-down vibration of the piezoelectric vibrator) and the action of alternate extrusion of the piezoelectric vibrator and the vibration plate.
Further, the piezoelectric vibrator is driven by an alternating voltage signal with an ultrasonic frequency (> 20 kHz), and according to the above formula, the volume of a single droplet ejected from a micropore becomes smaller under the driving of the ultrasonic frequency, and the total volume of a droplet ejected from a micropore becomes larger due to the high frequency and the high energy density.
The project has the characteristics and advantages that: 1. the piezoelectric driving has the advantages of low power consumption, simple structure, easy integration and no electromagnetic interference; 2. the piezoelectric vibrator drives the vibrating plate to cooperatively vibrate in the liquid drop generator, liquid is repeatedly extruded by the sealing block to realize the injection of liquid drops, the liquid drop generator works stably and can realize the injection of high-viscosity liquid, and meanwhile, the piezoelectric vibrator is positioned outside the injection device and the piezoelectric ceramic of the piezoelectric vibrator is not contacted with fluid in the injection device, so that the installation requirement of a system is reduced and the working stability of the system is improved; 3. the spraying device can be driven by ultrasonic, so that the spraying efficiency is high; 4. the injector is detachably installed, and is convenient to use.
Drawings
FIG. 1 is a schematic diagram of an example of the present disclosure;
FIG. 2 is an enlarged view of a portion of the area A of FIG. 1 in accordance with the present invention;
fig. 3 is a partial enlarged view of a region of the stage 431 in the vibration plate 43 of fig. 2;
FIG. 4 is a first operational state diagram of FIG. 2;
FIG. 5 is a second operational state diagram of FIG. 2;
fig. 6 is a schematic view of a preferred construction of the seal block 44.
Reference numerals:
the syringe 1, the compression spring 11, the piston 12, the inner chamber 13, the first outlet 1b, the coupler 14, the pipe 2, the base 3, the droplet generator 4, the second inlet 4a, the second outlet 4b, the piezoelectric vibrator 41, the piezoelectric ceramic 411, the metal substrate 412, the driving chamber 42, the vibration plate 43, the micro-hole 431, the sealing block 44, the contact surface 441, the pressing chamber 442, the tapered surface 443.
Description of the embodiments
In the following description, the technical solutions of the present invention will be clearly and fully described with reference to the accompanying drawings, it should be noted that the terms "middle", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
Referring to fig. 1, 2, 3, 4, 5 and 6, an embodiment of the present invention provides a spraying device for high-viscosity liquid.
Referring to fig. 1, which is a schematic view of an example of the disclosure of the present invention, the high-viscosity liquid is injected from the syringe 1 by the high-viscosity liquid injection device, and the high-viscosity liquid is ejected from the second outlet 4b by the droplet generator 4, the high-viscosity liquid injection device comprising:
a syringe 1 having a compression spring 11, a piston 12, an inner chamber 13, a first outlet 1b; the inner cavity 13 is filled with high-viscosity liquid; the compression spring 11 has a certain compression amount, and the compression spring 11 pushes the piston 12 and gives a certain pressure to the liquid in the inner cavity 13; the piston 12 is provided with a sealing ring to ensure the tightness; a droplet generator 4 provided with a piezoelectric vibrator 41, a driving chamber 42, a vibration plate 43, a sealing block 44, a second inlet 4a, and a second outlet 4b; a pipe 2 communicating the first outlet 1b of the injector 1 with the second inlet 4a of the drop generator 4; a coupling 14 for detachably connecting the first outlet 1b of the syringe and the pipe 2; a base body 3 for mounting the drop generator 4.
The droplet generator 4 converts the high-viscosity liquid into fine droplets and ejects the droplets from the second outlet 4 b.
Referring to fig. 2, which is a partial enlarged view of a region a in fig. 1, which includes a droplet generator 4 and its connection portion with other components, the droplet generator 4 is provided with a piezoelectric vibrator 41, a sealing block 44, and a vibration plate 43 from top to bottom with a substrate 3 as a base; the piezoelectric vibrator 41, the base body 3 and the vibration plate 43 are sequentially connected to form a driving cavity 42; the second inlet 4a communicates with the drive chamber 42; the vibration plate 43 is a thin metal plate; a plurality of groups of micropores 431 arranged in an array are arranged at the center of the vibration plate 43; the upper surface of the sealing block 44 is concentrically adhered to the piezoelectric vibrator 41, the lower surface of the sealing block 44 is in contact with the upper surface of the vibration plate 42 and completely covers the micropore 431 area in the center of the vibration plate 42, that is, the outer diameter of the sealing block 44 is larger than the diameter of the range of the micropore 431 area, and the sealing block 44 has a pressing force on the vibration plate 43, which can prevent leakage of the injected liquid; the sealing block 44 is made of an elastic material, such as silica gel; the piezoelectric vibrator 41 is formed by concentrically bonding a piezoelectric ceramic 411 and a metal substrate 412; the radial outer edge of the piezoelectric vibrator 41 is connected with the substrate 3; the radially outer edge of the diaphragm 43 is connected to the base body 3.
Referring to fig. 3, which is a partially enlarged view of the region of the micro-hole 431 in the vibration plate 43, wherein the micro-hole 431 is a tapered hole having a sectional diameter gradually decreasing from top to bottom, θ is a taper angle of the micro-hole 431, t is a thickness of the land 431, and D is a large end sectional diameter of the micro-hole 431. The taper angle θ of the micropores 431 is in the range of 40 ° to 60 °, the thickness t is in the range of 0.05mm to 0.20mm, and the large-end cross-sectional diameter D is in the range of 3 μm to 15 μm.
Further, as shown in fig. 6, the lower surface of the sealing block 44 is provided with a contact surface 441 and an extrusion cavity 442 in sequence from outside to inside; the contact surface 441 contacts the vibration plate 43, and the contact surface 441 surrounds the micropore 431 area at the contact point of the vibration plate 43, which can ensure the sealing of the micropore 431 when not in operation; the squeeze cavity 442 stores liquid for ejection; a central symmetrical conical surface 443 is arranged in the extrusion cavity 442; the depth of the tapered surface 443 gradually decreases from inside to outside, so that the driving force of the piezoelectric vibrator 41 can be focused on the central liquid area, and the liquid ejection effect can be improved.
Referring to fig. 2, 4, and 5, when no driving voltage is applied, the piezoelectric vibrator 41 is in a non-deformed state, and the sealing block 44 is in a pressed state, that is, an initial state of the droplet generator 4; referring to fig. 4, when a voltage opposite to the polarization direction of the piezoelectric ceramic 411 is applied, the piezoelectric vibrator 41 bends and deforms upwards, the piezoelectric vibrator 41 drives the sealing block 44 to be separated from the vibrating plate 43, a gap appears between the sealing block 44 and the platform 431, and the high-viscosity liquid fills the gap between the sealing block 44 and the platform 431 under the action of the compression spring 11, which is the first working state of the droplet generator 4; referring to fig. 5, which is a second operation state diagram of the droplet generator 4, when a voltage in the same polarization direction as the piezoelectric ceramic 411 is applied, the piezoelectric vibrator 41 is bent downward, the piezoelectric vibrator 41 drives the sealing block 44 to contact the vibration plate 43 again and squeeze the high-viscosity liquid in the gap between the sealing block 44 and the vibration plate 43, and the high-viscosity liquid is ejected from the micro-holes 431; driven by the alternating voltage signal, the piezoelectric vibrator 41 and the vibration plate 43 vibrate cooperatively and the sealing block 44 continuously presses the liquid and ejects the liquid droplets.
Referring to fig. 3, the micro-holes 431 are micro-scale taper holes, and under the action of the surface tension of the liquid, the action of the flow resistance difference between the expansion opening and the contraction opening (the transition between the expansion opening and the contraction opening of the micro-holes 431 is shown relative to the liquid in the vertical vibration process of the piezoelectric vibrator 41), and the action of the alternate extrusion of the piezoelectric vibrator 41 and the vibration plate 43, the micro-holes 431 can realize the unidirectional injection of micro-droplets. Driven by the alternating voltage signal, the liquid volume formula ejected by the liquid drop generator 4 is as follows
Figure SMS_1
Where lambda is the scaling factor,Ris the vibration radius delta of the vibration plate 43VIs the volume change caused by microwell 431, +.>
Figure SMS_2
Is the vibration frequency of the vibration plate 43, +.>
Figure SMS_3
Is the average value of the loss coefficient of the microporous 431 as the diffusion port element,/->
Figure SMS_4
Is the average value of the loss coefficient of the cells of the shrinkage cavity 431, < >>
Figure SMS_5
Is the maximum amplitude of the vibration plate 43. />

Claims (5)

1. A high viscosity liquid jetting device, characterized in that: comprises a syringe, a pipeline, a connector, a matrix and a liquid drop generator; the injector is provided with a compression spring, a piston, an inner cavity and a first outlet; the inner cavity is filled with high-viscosity liquid; the first outlet is communicated with the inner cavity; the compression spring has a certain compression amount, and pushes the piston and applies a certain pressure to liquid in the inner cavity; the piston is provided with a sealing ring to ensure the tightness; the center of the matrix is provided with the liquid drop generator; the drop generator is provided with a second inlet and a second outlet; the liquid drop generator sprays high-viscosity liquid into tiny liquid drops and ejects the tiny liquid drops from the second outlet; the pipeline is communicated with a first outlet of the injector and a second inlet of the liquid drop generator; the coupler connects the first outlet of the syringe and the tubing.
2. A spray device for high viscosity liquid according to claim 1, characterized in that: the coupler is a detachable structure.
3. A spray device for high viscosity liquid according to claim 1, characterized in that: the liquid drop generator is provided with a piezoelectric vibrator, a sealing block and a vibrating plate from top to bottom; the piezoelectric vibrator, the matrix and the vibrating plate are sequentially connected to form a driving cavity; the second inlet is communicated with the driving cavity; the vibrating plate is a metal sheet; the center of the vibrating plate is provided with micropores which are arranged in an array; the piezoelectric vibrator is formed by concentrically bonding piezoelectric ceramics and a metal substrate; the radial outer edge of the metal substrate is connected with the base body; the radial outer edge of the vibration plate is connected with the base body; the upper surface of the sealing block is concentrically bonded with the lower surface of the metal substrate; the lower surface of the sealing block is contacted with the upper surface of the vibrating plate; the outer diameter of the lower surface of the sealing block surrounds a micropore area in the center of the vibrating plate; the sealing block has extrusion force on the vibrating plate; the sealing block is made of elastic materials; the micro-hole is a conical hole with the sectional diameter gradually reduced from top to bottom, theta is the taper angle of the micro-hole, t is the thickness of the platform, D is the large-end sectional diameter of the micro-hole, the taper angle theta ranges from 40 degrees to 60 degrees, the thickness t ranges from 0.05mm to 0.20mm, and the large-end sectional diameter D ranges from 3 mu m to 15 mu m.
4. A spray device for a high viscosity liquid according to claim 3, characterized in that: the lower surface of the sealing block is sequentially provided with a contact surface and an extrusion cavity from outside to inside; the contact surface is contacted with the vibrating plate, and the contact position of the contact surface and the vibrating plate surrounds the micropore area; a conical surface with central symmetry is arranged in the extrusion cavity; the depth of the conical surface gradually decreases from inside to outside.
5. A spray device for a high viscosity liquid according to claim 3, characterized in that: the piezoelectric vibrator is driven by an alternating voltage signal of ultrasonic frequency.
CN202310390347.0A 2023-04-13 2023-04-13 Jetting device for high-viscosity liquid Withdrawn CN116237190A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310390347.0A CN116237190A (en) 2023-04-13 2023-04-13 Jetting device for high-viscosity liquid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310390347.0A CN116237190A (en) 2023-04-13 2023-04-13 Jetting device for high-viscosity liquid

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CN116237190A true CN116237190A (en) 2023-06-09

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Application publication date: 20230609