EP0417285A1 - Generateur electrique de jet de gouttes - Google Patents

Generateur electrique de jet de gouttes Download PDF

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Publication number
EP0417285A1
EP0417285A1 EP89907880A EP89907880A EP0417285A1 EP 0417285 A1 EP0417285 A1 EP 0417285A1 EP 89907880 A EP89907880 A EP 89907880A EP 89907880 A EP89907880 A EP 89907880A EP 0417285 A1 EP0417285 A1 EP 0417285A1
Authority
EP
European Patent Office
Prior art keywords
tube
cap
nozzle
atomizer
liquid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89907880A
Other languages
German (de)
English (en)
Other versions
EP0417285A4 (en
Inventor
Viktor Ivanovich Bezrukov
Vladimir Dmitrievich Spiridonov
Evgeny Fedorovich Suhodolov
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LENINGRADSKY INSTITUT TOCHNOI MEKHANIKI I OPTIKI
Original Assignee
LENINGRADSKY INSTITUT TOCHNOI MEKHANIKI I OPTIKI
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LENINGRADSKY INSTITUT TOCHNOI MEKHANIKI I OPTIKI filed Critical LENINGRADSKY INSTITUT TOCHNOI MEKHANIKI I OPTIKI
Publication of EP0417285A1 publication Critical patent/EP0417285A1/fr
Publication of EP0417285A4 publication Critical patent/EP0417285A4/ru
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/015—Ink jet characterised by the jet generation process
    • B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
    • B41J2/025—Ink jet characterised by the jet generation process generating a continuous ink jet by vibration

Definitions

  • the invention relates to electric droplet jet generators and can be used in printing devices, marking modules and devices for microdosing and granulating.
  • An electric droplet jet generator is used to generate a droplet jet of a working liquid, which is used to apply characters or images to a base or to generate predetermined liquid microdoses and solid granules which form when the liquid droplets harden.
  • the liquid flow is generated by means of an atomizer which is equipped with a nozzle and to which the working liquid is fed under pressure.
  • the liquid jet flowing out of the nozzle is split into individual droplets by generating pressure fluctuations (pulsations) of the liquid inside the atomizer.
  • an electric droplet jet generator (GB, A, 1347148) with an atomizer, which contains a tube, which is arranged at one end for connection to a pipeline for the supply of liquid under pressure into the interior of the tube, and has a nozzle which is at the second end of the tube.
  • the nozzle is carried out in a watch stone which is pressed into the second tube end.
  • the droplet generator also contains piezoelectric elements which ensure the deformation of the atomizer to generate the pressure fluctuations of the liquid inside the tube and to split it up into individual droplets as a result of these pressure fluctuations of the liquid jet flowing out of the nozzle.
  • the probability of the atomizer nozzle becoming blocked is very high due to the occurrence of insoluble compounds in the working fluid, the accidental penetration of solid particles into the working fluid that form in the working fluid container or in the pipeline, and when using suspensions as working fluid is caused by the separation of their solid particles.
  • the droplet dimensions may become unstable, compromising the quality of the droplet formation and making the generator unreliable.
  • cleaning the nozzle when it is clogged is made more difficult, since the entire generator must be dismantled and then assembled and adjusted to clean the nozzle.
  • the invention has for its object to provide an electric droplet jet generator in which the atomizer is designed so as to allow a change in the dimensions of the droplets to be generated over a wide range, to facilitate the process of nozzle cleaning and thereby the generator more convenient To make operation and to increase the operational reliability of the generator and the quality of the droplet formation.
  • a droplet jet generator with an atomizer, which contains a tube, one end of which is set up for connection to a pipeline for the supply of liquid under pressure into the interior of the tube, and a nozzle which is arranged at the second end of the tube lies, and with means for generating pressure fluctuations of the liquid inside the tube for splitting the liquid jet flowing out of the atomizer nozzle into individual droplets, according to the invention solved in that the atomizer additionally contains a removable cap which is airtight with its open end the second pipe end is placed that the nozzle in closed end of the cap and that the edge of the second end of the nozzle tube is a sharp edge, which is formed by cutting the outer and inner surface of the tube and abuts the inner side surface of the cap.
  • Such a construction of the generator enables the cap in which the nozzle is formed to be easily removed for cleaning the nozzle, which ensures an increase in the operational reliability of the generator and the quality of the droplet formation.
  • the respective cap can easily be exchanged for a cap which has a different nozzle diameter, which enables the dimensions of the droplets to be produced to be changed slightly and makes the generator more convenient to operate.
  • the formation of air cushions (bubbles) in the supply of the working fluid to the atomizer must be prevented in the atomizer at the joint of the cap and the tube, since the presence of such cushions reduces the pressure fluctuations of the fluid due to the high compressibility of the air caused in the immediate vicinity of the nozzle and thus affects the quality of the droplet formation.
  • the formation of such air cushions is prevented by the gradual, smooth transition from the inner surface of the nozzle tube to the inner surface of the removable cap in the immediate vicinity of the nozzle, thereby avoiding the formation of congestion zones and ensuring displacement of the air bubbles by the liquid flow that is supplied to the atomizer .
  • the most expedient is the formation of the outer surface of the second atomizer tube end and the inner surface of the cap in the form of conical surfaces which taper and abut one another in the direction of the closed cap end, as a result of which the cap can be easily removed and fitted and its airtight connection to the atomizer tube without the use of additional Facilities is guaranteed.
  • a filter can be arranged inside the cap in front of the nozzle, which ensures additional cleaning of the working fluid in the immediate vicinity of the nozzle, thereby reducing the probability of nozzle clogging and thus increasing the operational reliability of the generator and the quality of the droplet formation.
  • the Eicktro droplet jet generator contains a housing I and an atomizer which contains a tube 2 which is equipped with a flange 3. One end of the tube 2 is inserted in the housing I and connected via a nozzle 4 to a pipeline 5 for the supply of the working fluid into the atomizer under pressure.
  • a removable cap 6 On the second end of the tube 2, a removable cap 6 is placed airtight with its open end.
  • a nozzle 7 is formed in the closed end of the cap 6.
  • the nozzle 7 can be embodied in a watch stone which is pressed into the cap 6 or, as shown in the drawing, is glued to the outside of the cap, for example with epoxy resin.
  • the nozzle 7 can also be embodied in a metal foil glued to the outside of the cap 6.
  • the needle holder of a medical syringe (without a needle) can also be used as the removable cap 6.
  • a replaceable filter 8 is arranged in the interior of the cap 6 in front of the nozzle 7.
  • the filter 8 can be designed as a multilayer membrane filter of variable fineness or as a porous filter of such a structure.
  • the filter 8 can be reached into the interior of the tube 2, increasing the coarseness of the attached sections, which increases the service life of the filter 8.
  • the edge of the second end of the tube 2 is in the form of a sharp edge, which is formed by cutting the outer and inner surfaces of the tube 2 and abuts the inner side surface of the cap 6.
  • the outer surface of the second end of the atomizer tube 2 and the inner side surface of the cap 6 represent conical surfaces that taper towards the closed end of the cap 6.
  • Other variants of fastening the cap 6 on the end of the tube 2, for example using a screw connection, are also possible.
  • the means for generating the pressure fluctuations of the liquid inside the tube 2 for separating the liquid flow into individual droplets are in the form of two piezoceramic disks 9 which are arranged on the tube 2 between the flange 3 and the wall of the housing I.
  • An annular electrode 10 is attached between the disks 9 and is connected to an AC voltage source (not shown), the second connection of which is connected to the housing 1.
  • the flange 3 of the atomizer and the piezoceramic disks 9 together with the electrode 10 are fastened to one another and to the wall of the housing I with an adhesive.
  • the generator works as follows.
  • the working fluid which flows out through the nozzle 7 is conveyed into the tube 2 of the atomizer under constant pressure via the pipeline 5.
  • the piezoceramic disks 9 are alternately stretched and compressed. This causes the deformation of the tube 2 of the atomizer, which causes pulsations of the liquid pressure in the tube 2.
  • the jet of liquid flows out of the nozzle 7 at a pulsating speed, which causes constrictions in the jet which cause the jet to split into a regular one.
  • Guide the droplet sequence at the outlet from the nozzle 7, the repetitive frequency of the droplets being the same as the pulsation frequency.
  • the change in the dimensions of the droplets generated by the generator is carried out, if necessary, by simply replacing the cap 6 with another cap with a different diameter of the nozzle 7. Disassembly of the entire generator and its subsequent assembly and adjustment are not necessary. If the nozzle 7 becomes blocked, it can be easily cleaned, for which purpose the cap 6 is removed and, for example, placed in a bath for ultrasonic cleaning. Regular cleaning increases the operational reliability of the generator and the quality of the droplet formation.
  • the liquid supply is interrupted and air enters the interior of the tube 2. Since the edge of the second end of the tube 2 represents a sharp edge, which abuts the inner side surface of the cap 6, a rapid transition from the inner surface of the tube 2 to the inner surface of the cap 6 is ensured.
  • the working fluid is fed into the tube 2, all of the air that is in the tube 2 is displaced by the supplied liquid flow, so that no air cushions (bubbles) remain inside which impair the quality of the droplet formation.
  • the filter 8 arranged in the cap 6 in front of the nozzle 7 ensures additional filtration of the liquid in the immediate vicinity of the nozzle 7, i.e. at the most important point, thereby preventing the nozzle 7 from becoming blocked and the generator operation from being disrupted. Since the cap 6 can be easily removed, the filter 8 can be easily replaced when it is dirty.
  • the electric droplet jet generator can be used in printing devices, marking modules and for the production of liquid microdoses and granules of a solid that forms when a liquid hardens.

Landscapes

  • Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
  • Ink Jet (AREA)
  • Nozzles (AREA)

Abstract

Un générateur électrique de jet de gouttes comprend un pulvérisateur alimenté en liquide de travail sous pression. Des oscillations de pression du liquide sont créées à l'intérieur dudit pulvérisateur au moyen de rondelles piézocéramiques (9). A l'extrémité du tube (2) du pulvérisateur est monté hermétiquement un couvercle (6) doté d'un ajutage (7). Les surfaces extérieure et intérieure du tube (2) du pulvérisateur forment à leur point d'intersection une arête vive contiguë à la surface intérieure du couvercle démontable (6).
EP19890907880 1989-03-07 1989-03-07 Electric drop-jet generator Withdrawn EP0417285A4 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SU1989/000059 WO1990010846A1 (fr) 1989-03-07 1989-03-07 Generateur electrique de jet de gouttes

Publications (2)

Publication Number Publication Date
EP0417285A1 true EP0417285A1 (fr) 1991-03-20
EP0417285A4 EP0417285A4 (en) 1991-08-28

Family

ID=21617419

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890907880 Withdrawn EP0417285A4 (en) 1989-03-07 1989-03-07 Electric drop-jet generator

Country Status (6)

Country Link
EP (1) EP0417285A4 (fr)
JP (1) JPH03504578A (fr)
BR (1) BR8907474A (fr)
DK (1) DK265890A (fr)
FI (1) FI905466A0 (fr)
WO (1) WO1990010846A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019154558A1 (fr) * 2018-02-12 2019-08-15 Karlsruher Institut für Technologie Tête d'impression et procédé d'impression

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62170351A (ja) * 1986-01-24 1987-07-27 Toshiba Corp インクジエツトヘツド
EP0232062A2 (fr) * 1986-02-04 1987-08-12 Domino Printing Sciences Plc Générateur d'un jet de gouttelettes d'encre

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU68048A1 (ru) * 1941-05-01 1947-03-31 А.Д. Лаврентьев Пишущее приспособление к регистрирующим приборам
US3683396A (en) * 1970-08-05 1972-08-08 Dick Co Ab Method and apparatus for control of ink drop formation
SU1268953A1 (ru) * 1985-05-14 1986-11-07 Ленинградский Ордена Трудового Красного Знамени Институт Точной Механики И Оптики Генератор капель

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62170351A (ja) * 1986-01-24 1987-07-27 Toshiba Corp インクジエツトヘツド
EP0232062A2 (fr) * 1986-02-04 1987-08-12 Domino Printing Sciences Plc Générateur d'un jet de gouttelettes d'encre

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 4, (M-657)[2851] 8. Januar 1988; & JP-A-62 170 351 (TOSHIBA CORP.) 27-07-1987 *
See also references of WO9010846A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019154558A1 (fr) * 2018-02-12 2019-08-15 Karlsruher Institut für Technologie Tête d'impression et procédé d'impression
US11198292B2 (en) 2018-02-12 2021-12-14 Karlsruher Institute Fuer Technologie Print head and printing method

Also Published As

Publication number Publication date
DK265890A (da) 1990-12-21
JPH03504578A (ja) 1991-10-09
DK265890D0 (da) 1990-11-06
WO1990010846A1 (fr) 1990-09-20
BR8907474A (pt) 1991-05-14
EP0417285A4 (en) 1991-08-28
FI905466A0 (fi) 1990-11-05

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