EP0040068B1 - Dispositif pour distribuer un liquide - Google Patents

Dispositif pour distribuer un liquide Download PDF

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Publication number
EP0040068B1
EP0040068B1 EP19810302056 EP81302056A EP0040068B1 EP 0040068 B1 EP0040068 B1 EP 0040068B1 EP 19810302056 EP19810302056 EP 19810302056 EP 81302056 A EP81302056 A EP 81302056A EP 0040068 B1 EP0040068 B1 EP 0040068B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
bore
needle valve
valve
valve seat
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.)
Expired
Application number
EP19810302056
Other languages
German (de)
English (en)
Other versions
EP0040068A1 (fr
Inventor
Jacob Jay Boone
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.)
Nordson Corp
Original Assignee
Nordson Corp
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 Nordson Corp filed Critical Nordson Corp
Publication of EP0040068A1 publication Critical patent/EP0040068A1/fr
Application granted granted Critical
Publication of EP0040068B1 publication Critical patent/EP0040068B1/fr
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/02—Applying adhesives or sealing liquids
    • B65B51/023—Applying adhesives or sealing liquids using applicator nozzles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/30—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages
    • B05B1/3033—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head
    • B05B1/304—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve
    • B05B1/3046—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice
    • B05B1/306—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means designed to control volume of flow, e.g. with adjustable passages the control being effected by relative coaxial longitudinal movement of the controlling element and the spray head the controlling element being a lift valve the valve element, e.g. a needle, co-operating with a valve seat located downstream of the valve element and its actuating means, generally in the proximity of the outlet orifice the actuating means being a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0225—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work characterised by flow controlling means, e.g. valves, located proximate the outlet

Definitions

  • This invention relates to a nozzle for liquid dispensing devices and particularly to devices adapted for dispensing relatively viscous sticky substances such as adhesives, hot melts, sealing compounds, etc.
  • dispensers there are many applications for dispensers in which it is desirable or necessary to sharply cut off the flow of liquid from the nozzle of the device without any drooling, dripping, or stringing of the liquid from the nozzle after closing of the nozzle. To that end there has been a long standing need for a dispensing device which would sharply cut off the flow of liquid from the nozzle when the valve of the nozzle is closed.
  • a nozzle having a bore, the outlet of which is at one end of a frustoconical valve seat on which an axially movable needle valve seats to close the nozzle bore.
  • a nozzle for extruding viscous liquid has an axial bore, the bore having a frustoconical valve seat formed therein, terminating at a nozzle outlet orifice, an axially movable needle valve having a generally conically shaped section on the distal end thereof, engageable with the valve seat to close the nozzle bore, the nozzle having a tip which tapers inwardly toward the nozzle orifice, the tip of the needle valve when the valve is in its closed position being substantially flush with the outer surface of the nozzle tip, characterised in that a .
  • bushing is located within the nozzle, and having a needle valve guide surface formed therein, engageable with the needle valve at a location spaced from the valve seat so as to guide movement of the needle valve along a longitudinal axis concentric with the valve seat, the bushing providing passageways for supplying liquid to the nozzle and in that the nozzle tip terminates in a semi-spherical end surface.
  • Preferably sharp cut off of flow without stringing from the nozzle of the dispensing device is achieved by providing a small orifice in the very small radius semi-spherical end surface of the nozzle.
  • the radius of the semi-spherical end may be between 0.127 cm and 0.254 cm (0.05 inches to 0.10 inches).
  • the nozzle orifice is only .051 cm (.020 inch) in diameter and the nozzle tip is semi-spherical in shape and only .213 cm (.084 inch) in radius.
  • a nozzle thus configurated and having a frustoconical valve seat located immediately adjacent the nozzle orifice has been found to result in a nozzle which materially reduces the amount of stringing of material between the nozzle and substrate upon which the material is being deposited.
  • the improved seating of the needle valve on the valve seat of a dispenser of the invention with the consequent reduction of dripping or drooling or stringing from the nozzle may be achieved by providing a needle valve guide surface within a bushing contained in the nozzle and located immediately adjacent the nozzle valve seat.
  • the nozzle may include a guide bushing press fit into the nozzle and having peripheral channels or grooves through which liquid may flow from the interior of the device to the valve seat.
  • a nozzle in accordance with the invention provides very sharp cut off of liquid from the nozzle whenever the valve of the dispensing device is closed. Consequently, there is no dripping of liquid from the device after valve closing. If the device is used to dispense very viscous substances such as adhesive or sealing compounds, this unique nozzle and needle valve guide structure materially reduces stringing of the viscous substance between the nozzle orifice and the substrate on which the viscous substance is deposited.
  • a dispensing gun 10 has a generally cylindrical body 11, an end cap 12, and a nozzle 13.
  • the end cap 12, body 11, and nozzle 13 all have a longitudinal bore extending therethrough within which there is located an axially movable needle valve 14 for controlling flow of liquid from the orifice 16 of the nozzle 13.
  • the valve body 11 has a stepped axial bore 20, the larger diameter section 21 of which is located at the forward end of the body. This larger diameter section 21 is intersected by a transverse passage 22 through which liquid is supplied to the gun. Additionally, a vent port 23 intersects the smaller diameter section 24 of the bore 20. There is also an air inlet passage 25 which connects the rear end of the valve body with an inlet air port 26.
  • a bushing 27 is located within the bore 20 of the body 11. This bushing supports seal assemblies 29 and 30 within a bore 28 which extends longitudinally through the bushing.
  • a piston assembly 35 mounted upon the needle valve 14 for controlling movement of the needle valve 14.
  • This piston assembly comprises a nut 36 threaded onto a threaded section 37 of the needle valve and a piston retainer ring 38 sealingly secured onto the periphery of the nut 36.
  • This retainer ring carries a pair of piston rings 39, 40 between which there is sandwiched a resilient gasket 41. The outer edge of this gasket 41 contacts the interior surface of a cylinder 42 formed on the interior of the end cap so as to form a pneumatic seal between the lower side of the piston and the surface of the cylinder 42.
  • the end cap 12 is bolted onto the upper end of the body 11 by bolts (not shown).
  • a resilient gasket seal 44 is located between the contacting surfaces of the end cap and the body.
  • a stepped axial bore 45 which extends through the end cap.
  • the upper smaller diameter section 46 of this stepped bore is threaded and receives an adjustment stud 47.
  • a lock nut 48 secures the stud 47 in a position of axial adjustment.
  • this compression spring 50 Between the bottom surface of the stud 47 and the top of the piston assembly 35, there is a compression spring 50.
  • the upper end of this compression spring 50 contacts the bottom surface of the stud 47 and the lower end of the spring 50 contacts the top surface of a spring retainer 51.
  • This spring retainer is supported upon the top surface of the piston assembly nut 36.
  • the nozzle 13 contains a generally cylindrical axial bore 60 which extends forwardly from the rear of the nozzle until it intersects a frustoconical valve seat 61 at the forward end of the nozzle.
  • This frustoconical valve seat 61 in turn communicates with a small cylindrical nozzle orifice 16 through which liquid exits from the nozzle.
  • this orifice is approximately 0.51 mm (.020 inch) in diameter and the valve seat 61 defines an included angle of 34°.
  • This bushing 90 Press fit into the bore 60 there is a guide bushing 90.
  • This bushing 90 has a central axial bore 91 through which a needle valve 14 passes. Additionally, it has four equidistantly spaced longitudinal channels or grooves 92 in its peripheral surface through which liquid may flow from the interior of the gun body 11 to the nozzle orifice 16 as is explained more fully hereinafter.
  • the needle valve 14 At its forward end the needle valve 14 has a cylindrical section 65 slideably received within the bore 91 of the guide bushing 90.
  • This sliding fit requires that the bore 91 be slightly larger than the cylindrical section 65 of the needle, but that there be no more than approximately 0.051 mm (.002 inch) clearance between the bore and the needle valve.
  • the clearance is approximately 0.025 mm (.001 inch).
  • the needle valve 14 terminates in a frustoconical shaped valve section 66 engageable with the frustoconical shaped valve seat 61 in the nozzle 13.
  • the frustoconical shaped end section 66 of the needle valve defines an included angle a of approximately 30° while the valve seat 61 defines and included angle B of approximately 34°.
  • the exterior surface 67 of the nozzle tip is also tapered at approximately 34°. Consequently, there is some slight clearance between the frustoconical shaped section of the needle valve 65 and the valve seat 61 at the rearward end of the valve seat.
  • the nozzle tip is semi-spherical and has a very small radius of 2.13 mm (0.084 inch).
  • the nozzle 13 has a cylindrical hub section 70 which is tightly fitted within the large diameter section 21 of cylindrical bore 20 on the body 11. Forwardly of the hub section 70, there is a flange 71 which is bolted to the forward end of the body 11 by conventional threaded connectors 73.
  • a spring 76 located between the rearward end of the nozzle 13 and the forward end of the bushing seal assembly 29. This spring 76 biases the bushing rearwardly and maintains a flange 77 of the bushing engaged with a shoulder 78 formed in the bore 20.
  • liquid under pressure is supplied to the liquid inlet port 80 of the device.
  • This port communicates via passage 22 with the bore 20 of the body 10 such that liquid supplied to the port 80 flows into a liquid storage chamber 81 contained within the device.
  • This chamber 81 is in turn open to the longitudinal passages 92 within the guide bushing 90.
  • the most important advantage of this invention resides in the fact that when it is used to dispense high viscosity liquids such as adhesives or sealing gasket material compounds, etc., it materially eliminates or reduces stringing of material from the nozzle orifice after valve dosing.
  • This advantage is apparently partially attributable to the needle valve guide surface being in close proximity to the nozzle valve seat and partially attributable to the small radius semi-spherical tip on the nozzle.
  • the needle valve guide surfaces on the guide bushing apparently maintains the needle valve concentric to the valve seat with the result that sharp cut off of flow and the reduction or elimination of stringing is enhanced and apparently the small radius semi-spherical tip on the nozzle also contributes to this reduction.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Coating Apparatus (AREA)
  • Nozzles (AREA)

Claims (9)

1. Bec pour pousser un liquide visqueux, ayant un alésage axial, l'alésage ayant un siège de soupape de forme tronconique, se terminant à un orifice de sortie du bec, une soupage à pointeau axialement mobile ayant une section de forme généralement conique à son extrémité distale, qui peut être engagée avec le siège de soupape pour fermer l'alésage du bec, le bec ayant une extrémité qui s'amincit en cône vers son orifice, l'extrémité de la soupape à pointeau quand la soupage est en position fermée étant substantiellement de niveau avec la surface externe de l'extrémité du bec, caractérisé en ce qu'une douille 90 est placée à l'intérieur du bec 13 et a une surface 91 de guidage de la soupape à pointeau qui y est formée et qui peut s'engager avec la soupape 14 du bec à un endroit espacé du siège 61 de la soupape de manière à guider le mouvement de la soupape 14 à pointeau le long d'un axe longitudinal concentrique au siège de la soupape, la douille présentant des passages 92 pour fournir le liquide au bec et en que l'extrémité du bec se termine par une surface d'extrémité 67 hémisphérique.
2. Bec selon la revendication 1, caractérisé en ce que les passages sont formés par des rainures longitudinales 92 pratiquées dans la surface de la douille 90.
3. Bec selon l'une quelconque des revendications 1 ou 2, caractérisé en ce que la surface de guidage 91 de la soupape à pointeau s'étend sur une partie substantielle de la longueur axiale du bec 13.
4. Bec selon l'une quelconque des précédentes revendications, caractérisé en ce qu'un réservoir de liquide est défini au moins en partie, par un alésage axial dans le corps du dispositif, l'alésage communiquant avec l'alésage 20 du bec.
5. Bec selon l'une quelconque des précédentes revendications, caractérisé en ce que la surface d'extrémité hémisphérique a un rayon compris entre 0.127 cm et 0.254 cm.
6. Bec selon l'une quelconque des précédentes revendications, caractérisé en ce que le rayon de la surface d'extrémité hémisphérique est de 0.213 cm.
7. Bec selon l'une quelconque des précédentes revendications, caractérisé en ce que l'amincissement de la surface extérieure 67 de l'extrémité du bec définit un angle inscrit d'approximativement 34°.
8. Bec selon l'une quelconque des précédentes revendications, caractérisé en ce que le dispositif 35 de pousée du fluide est monté dans un alésage du corps pour effectuer le mouvement de la soupape 14 à pointeau dans et en dehors de la zone d'engagement d'obturation avec le siège 61 de soupape.
9. Pistolet pour distribuer des liquides visqueux ayant un bec selon l'une quelconque des revendications 1 à 8.
EP19810302056 1980-05-09 1981-05-08 Dispositif pour distribuer un liquide Expired EP0040068B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14857780A 1980-05-09 1980-05-09
US148577 1988-01-26

Publications (2)

Publication Number Publication Date
EP0040068A1 EP0040068A1 (fr) 1981-11-18
EP0040068B1 true EP0040068B1 (fr) 1985-08-07

Family

ID=22526372

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810302056 Expired EP0040068B1 (fr) 1980-05-09 1981-05-08 Dispositif pour distribuer un liquide

Country Status (4)

Country Link
EP (1) EP0040068B1 (fr)
JP (1) JPS574267A (fr)
CA (1) CA1155094A (fr)
DE (1) DE3171682D1 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0066017A1 (fr) * 1981-05-27 1982-12-08 Nordson Corporation Distributeur de liquide
DE3236647C2 (de) * 1982-10-04 1985-02-28 Intec Bielenberg GmbH & Co KG, 5014 Kerpen Vorrichtung zur Ausgabe von Dickstoffen, insbesondere Dicht- und Klebemitteln
JPH0741185B2 (ja) * 1986-02-12 1995-05-10 ソニー株式会社 粘性物質塗布装置
JPH075910B2 (ja) * 1986-03-22 1995-01-25 忠生 白石 カプセル化酵素含有サニタリ−製品
FR2617062B1 (fr) * 1987-03-24 1990-04-27 Projets Nouveaux Distributeur-doseur de colle fondant a chaud
JPH01168373A (ja) * 1987-12-22 1989-07-03 Bridgestone Corp 標識塗布装置
GB9219498D0 (en) * 1992-09-15 1992-10-28 Lechler Ltd Valves
IE940697A1 (en) * 1994-09-06 1996-03-06 Loctite Ireland Ltd Applicator for liquids such as adhesives
US5924607A (en) * 1996-02-16 1999-07-20 Nireco Corporation Hot melt applicator and nozzle used therefor
CN103894316B (zh) * 2012-12-27 2017-02-08 鸿富锦精密工业（深圳）有限公司 发光二极管的点胶方法
CN103785560B (zh) * 2013-04-27 2016-12-07 广州海鸥卫浴用品股份有限公司 用于射流装置的喷针
DE102018114008A1 (de) * 2018-06-12 2019-12-12 Marcus Herrmann Vorrichtung und Verfahren zur Erzeugung dreidimensionaler Gegenstände
CN114453196B (zh) * 2022-02-22 2024-01-12 长子县金鑫机械电杆有限公司 一种法兰盘密封点胶系统

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB398788A (en) * 1931-12-12 1933-09-21 Otto Treichel Improvements in or relating to apparatus for spraying liquids
US2670241A (en) * 1951-05-22 1954-02-23 George S Pyles Flow gun
US2865675A (en) * 1956-04-13 1958-12-23 Vernon D Roosa Fuel injection nozzle
US2983480A (en) * 1956-07-02 1961-05-09 Grace W R & Co Valve stem and reciprocating shaft seal
FR1463455A (fr) * 1966-01-10 1966-12-23 Régulateur de pression pour lanceur de jet
DE2055127A1 (de) * 1970-11-10 1972-05-31 Cast, Adolf, Dipl.-Ing., 7311 Oberlenningen Klebegerät und -verfahren
US4066188A (en) * 1976-08-10 1978-01-03 Nordson Corporation Thermoplastic adhesive dispenser having an internal heat exchanger

Also Published As

Publication number Publication date
CA1155094A (fr) 1983-10-11
EP0040068A1 (fr) 1981-11-18
JPS574267A (en) 1982-01-09
DE3171682D1 (en) 1985-09-12

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