EP0230624B2 - Pistolet de pulvérisation électrostatique particulièrement pour poudres - Google Patents

Pistolet de pulvérisation électrostatique particulièrement pour poudres Download PDF

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Publication number
EP0230624B2
EP0230624B2 EP86117697A EP86117697A EP0230624B2 EP 0230624 B2 EP0230624 B2 EP 0230624B2 EP 86117697 A EP86117697 A EP 86117697A EP 86117697 A EP86117697 A EP 86117697A EP 0230624 B2 EP0230624 B2 EP 0230624B2
Authority
EP
European Patent Office
Prior art keywords
spray gun
inner tube
electrostatic spray
electrode
gun according
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 - Lifetime
Application number
EP86117697A
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German (de)
English (en)
Other versions
EP0230624A1 (fr
EP0230624B1 (fr
Inventor
Wolfgang Kuhn
Karl Rapp
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.)
Kopperschmidt-Muller GmbH and Co KG
Original Assignee
Kopperschmidt-Muller GmbH and Co KG
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Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6291941&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0230624(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Kopperschmidt-Muller GmbH and Co KG filed Critical Kopperschmidt-Muller GmbH and Co KG
Priority to AT86117697T priority Critical patent/ATE46460T1/de
Publication of EP0230624A1 publication Critical patent/EP0230624A1/fr
Publication of EP0230624B1 publication Critical patent/EP0230624B1/fr
Application granted granted Critical
Publication of EP0230624B2 publication Critical patent/EP0230624B2/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/025—Discharge apparatus, e.g. electrostatic spray guns
    • B05B5/03—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying
    • B05B5/032—Discharge apparatus, e.g. electrostatic spray guns characterised by the use of gas, e.g. electrostatically assisted pneumatic spraying for spraying particulate materials

Definitions

  • the invention relates to an electrostatic spray gun, in particular for powder, with an annular gap formed between an outer tube and a core tube, which is connected to a connection for material and / or gas, and an electrode which is arranged within the length of the core tube and with a high-voltage line running in the core tube is connected.
  • the annular gap serves to supply a powder-air mixture.
  • the core tube protrudes forward over the outer tube and has a circumferential gap through which rotating control air can be fed.
  • the ionization takes place with the aid of a third air flow, which is fed centrally and then introduced into the powder cloud at the mouth via a conical gap, which is partly delimited by a disk-shaped electrode.
  • an electrostatic paint application device (DE-A-26 42 587), in which a cyclone separator, which is delimited by a cylinder and a cone, is supplied with an already charged powder-air mixture via the inlet, while powder is supplied via a first one Exit exits and air is extracted via a second outlet.
  • a cyclone separator which is delimited by a cylinder and a cone, is supplied with an already charged powder-air mixture via the inlet, while powder is supplied via a first one Exit exits and air is extracted via a second outlet.
  • there are radiation-shaped, needle-shaped corona poles in the separator chamber which penetrate the wall of an insulator tube at their base. They are connected to an auxiliary corona pole that is slidably mounted in the tube, but not to a high voltage.
  • a spray device in which an electrostatic field is generated between an outer, high-voltage electrode and an inner, ground electrode.
  • the inner electrode consists of four radial knives, which are attached to a central support.
  • the invention has for its object to provide an electrostatic spray gun of the type described above, in which the ionization can be improved with very little design effort.
  • the electrode passes through the wall of the core tube with at least two tips offset in the circumferential direction and in that the high voltage supply to all tips is effected by a single central contacting of the electrode.
  • the tips of the electrode can be inside the annular gap. If the core tube protrudes forward over the outer tube, it is recommended that the electrode penetrate the wall in the middle of the protruding part of the core tube. The ionization therefore takes place where the powder-air mixture has already emerged from the narrow annular gap and has therefore reduced its speed. At this point, the corona discharge and the electrostatic field can spread freely and without hindrance through the insulating outer tube.
  • a channel runs inside the core tube, which is also connected to a connection for material and / or gas, it is recommended that the electrode also have discharge sections in the core tube channel. In this way, practically all of the medium supplied can be ionized with a single electrode, so that very intensive ionization of the material, in particular the powder, is possible.
  • the foremost part of the high-voltage line is preferably a contact element which is pressed against the central part of the electrode by a spring.
  • the spring ensures a certain contact pressure, which is maintained even in rough operation. Tolerance differences are also compensated for.
  • the spring and rod-shaped transmission elements can be arranged in a protective tube which carries the contact element at the front end.
  • This protective tube facilitates installation and guides the rod-shaped transmission elements that transmit the spring force and the electrical voltage.
  • Limiting resistances are particularly suitable as rod-shaped transmission elements.
  • the core tube channel is advantageously formed by the annular gap between the protective tube and the core tube. In this way, the protective tube and the limiting resistors located in it are constantly cooled. It also allows the annular gap that over to allow air supplied to the core tube channel to strike several off-center discharge sections of the electrode, which improves the ionization.
  • the electrode tips are preferably arranged in flat, dome-like depressions of the core tube surface. This creates sufficient space for the formation of the corona discharge without the tips having to protrude too far beyond the core tube surface. In some cases it is even sufficient if the tips end within the circumferential surface of the core tube.
  • the electrode consists of wire sections.
  • intersecting wire sections can be inserted through corresponding bores in the core tube wall.
  • the electrode can also consist of a star-shaped sheet metal cut.
  • an impact body is connected upstream of the mouth, which is connected to the core tube channel via an annular gap-like channel.
  • ionized air from the core tube channel is mixed with the powder-air mixture from the annular gap outside the core tube, which enables intensive ionization.
  • the impact body is preferably snapped onto a front resilient section of a holder inserted into the core tube. It can therefore be easily replaced and adapted to the respective working conditions, including ionization.
  • the holder is snapped onto a pin in the core tube with a rear resilient section.
  • the holder can also be easily removed and reinserted, which makes replacement and cleaning easier.
  • an electrostatic spray gun is illustrated, the handle 1 with a high-voltage line connection 2 and an air connection 3 and a throttle valve 4 in the air duct, an intermediate piece 5 with a connection 6 for a feed line 7, via which a powder-air mixture can be supplied and has an outer tube 8 plugged onto the intermediate piece 5 and a core tube 9 screwed into the intermediate tube.
  • the powder-air mixture is therefore supplied via an annular gap 10 between the outer tube 8 and the core tube 9 and exits the mouth 11 as an annular jet.
  • an electrode 12 is arranged, which consists of two intersecting wire sections 13 and 14. These are inserted through corresponding openings 15 in the wall of the core tube 9 and can be connected to one another in the middle.
  • there are four outer tips 16 which protrude outward from the core tube 9 and cause a corona discharge in the ring jet of the powder-air mixture emerging from the mouth 11. So that the tips do not have to protrude too far, a spherical cap-like shallow depression 17 is provided in the outer wall of the core tube 9.
  • the wire sections 19 exposed in the interior 18 of the core tube 9 likewise form discharge sections which are able to ionize the air flowing in via the line 7.
  • the center of the electrode 12 is touched by a contact piece 20 which is loaded by a spring 21 with the interposition of two rod-shaped transmission elements 22 and 23, here high-voltage resistors.
  • the spring is supported on a rigid high-voltage line 24 which is connected to the high-voltage connection 22.
  • the end section of this high-voltage line 24, the spring 21 and the transmission elements 22 and 23 are accommodated in a protective tube 25 which is screwed into the intermediate piece 5 and forms a guide for the transmission elements 22, 23.
  • the outer diameter of the protective tube 25 is smaller than the inner diameter of the core tube 9, so that an annular gap 26 remains, through which air supplied from the connection 3 is passed via the electrode 12 to the mouth 27 of the core tube, the protective tube 25 and the contained therein Resistors are cooled.
  • a holder 28 provided on the outside with axial grooves is inserted into the mouth 27 and snapped onto a cross pin 29 with a rear section which is made resilient by axial slots.
  • An impact body 30 is snapped onto the front section of the holder, which is likewise made resilient by axial slots. This results in an annular gap-like channel 31 for the emerging air, which is directed into the ring jet of the powder-air mixture with the aid of the impact body 30, so that a defined powder cloud is created.
  • the holder 28 has an axis alkanal 32 on which a part of the coming from the connector 3 and at the electrode 12 ionized air can be emitted, which flushes the empty space behind the impact body.
  • a sleeve 33 is inserted into the handpiece 1, which projects forward and engages in a bore 34 of the intermediate piece 5. It is then sufficient to use a tensioning device, e.g. B. axial screws to connect the handle 1 and the intermediate piece 5 along the separating surface 35, a channel 36 in the intermediate piece 5 coming into connection with the corresponding channel 37 in the handpiece.
  • a tensioning device e.g. B. axial screws to connect the handle 1 and the intermediate piece 5 along the separating surface 35, a channel 36 in the intermediate piece 5 coming into connection with the corresponding channel 37 in the handpiece.
  • the desired good ionization of the powder results from the fact that a strong corona discharge occurs at four tips 16 which are evenly distributed over the circumference, and because the shaping air supplied via the impact body 30 is also ionized.
  • the electrode 112 is located at a point where the tips 116 are located in the annular gap 110 between the outer tube 108 and the core tube 109 .
  • the spring 121 also acts as a contact piece.
  • the chain of rod-shaped transmission elements 122 and 123 is supported directly on the high-voltage line.
  • a protective tube is not provided. Rather, the transmission elements 122 and 123 are guided in the inner core tube channel 126 with the aid of guide sleeves 138 having longitudinal grooves.
  • the impact body 130 is preceded by a swirl device 139 in the form of helical grooves for the shaped air, so that it undergoes a swirl.
  • FIG. 4 shows that the gun illustrated in FIG. 1 can be converted into an automatic spray gun simply by replacing the handle 1 with a holder 101.
  • the holder is fastened to a supporting structure by means of its bore 140.
  • the electrode 212 of FIG. 5 has only two corona tips 216. This is of interest for the coating of some workpieces which require a stronger wrap on two opposite sides. If the spray gun emits a flat jet, it may also be of interest to arrange this electrode either in the plane of the flat jet or perpendicular to it. 6 and 7 show that the electrodes 312 and 412 can also be equipped with more tips 316 or fewer tips 416 than the number 4 illustrated in FIG. 2. 8 shows an electrode 512 with tips 516 arranged only on one side. This is recommended if the desired wrap must be particularly strong on one side.
  • the illustrated wire electrodes can be produced in such a way that the individual wires are inserted into bores in the core tube. Either the position of the wires is sufficiently secured by friction; or a cohesion is created by soldering or gluing in the center.
  • FIG. 9 illustrates a star electrode 612 made of sheet metal, which also has corona tips 616.
  • Such an electrode can be molded in, for example, in the manufacture of a plastic core tube.
  • the idea of the invention can also be applied to liquid spray guns, in particular to those in which atomizing and / or shaping air is supplied via an outer annular gap while the liquid is being fed through the core tube channel.
  • a swirl device can also be provided in the annular gap 31.
  • the gun can also be used for multi-component operation, where one component is fed through an outer annular gap and the other component through a channel in the core tube.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (15)

1. Pistolet de pulvérisation électrostatique, en particulier pour des poudres, comprenant un interstice annulaire formé entre un tube externe et un tube interne, et relié à un raccord à matière et/ou à gaz, et une électrode qui est agencée à l'intérieur de la longueur du tube interne et qui est raccordée à un conducteur haute tension s'étendant dans le tube interne, caractérisé en ce que l'électrode (12 ; 112) est munie d'au moins deux pointes (16 ; 116) décalées dans le sens périphérique qui traversent la paroi du tube interne eten ce que l'alimentation haute tension de toutes les pointes s'effectue par une mise en contact médiane unique de l'électrode.
2. Pistolet de pulvérisation électrostatique selon la revendication 1, dans lequel le tube interne fait saillie vers l'avant au-delà du tube externe, caractérisé par le fait que l'électrode (12) traverse la paroi du tube interne (9) dans les limites de la partie saillante de celui-ci.
3. Pistolet de pulvérisation électrostatique selon la revendication 1 ou 2, dans lequel l'espace intérieur du tube interne est parcouru par un canal qui est relié, lui aussi, à un raccord à matière et/ou à gaz, caractérisé par le fait que l'électrode (12) présente des tronçons de décharge (19) également dans le canal du tube interne.
4. Pistolet de pulvérisation électrostatique selon l'une des revendications 1 à 3, caractérisé par le fait que la partie antérieure extrême du conducteur (24) de haute tension est un élément de contact (20 ; 121) pressé, par la force d'un ressort, contre la partie médiane de l'électrode (12 ; 112).
5. Pistolet de pulvérisation électrostatique selon la revendication 4, caractérisé par le fait qu'un ressort (21) et des éléments de transmission (22, 23) en forme de barrettes sont disposés dans un tube protecteur (25), qui porte l'élément de contact (20) à son extrémité antérieure.
6. Pistolet de pulvérisation électrostatique selon la revendication 5, caractérisé par le fait que les éléments de transmission (22, 23 ; 122, 123) en forme de barrettes sont des résistances l imitatrices.
7. Pistolet de pulvérisation électrostatique selon l'une des revendications 3 à 6, caractérisé par le fait que le canal du tube interne est formé, au voisinage du tube protecteur (25), par un interstice annulaire (26) entre ce tube protecteur et ledit tube interne (9).
8. Pistolet de pulvérisation électrostatique selon l'une des revendications 1 à 7, caractérisé par le fait que les pointes de l'électrode sont logées dans des encaissements (17) de la surface du tube interne, aplatis et du type calottes.
9. Pistolet de pulvérisation électrostatique selon l'une des revendications 1 à 8, caractérisé par le fait que les pointes (16 ; 116 ; 216 ; 316 ; 416 ; 616) sont disposées selon un espacement angulaire égal.
10. Pistolet de pulvérisation électrostatique selon l'une des revendications 1 à 9, caractérisé par le fait que l'électrode (12 ; 112 ; 212 ; 312 ; 412 ; 512) est constituée par des tronçons (13, 14) de fils métalliques.
11. Pistolet de pulvérisation électrostatique selon la revendication 10, caractérisé par le fait que les tronçons (13, 14) de fils métalliques sont emboi- tés à travers des perçages correspondants (15), pratiqués dans la paroi du tube interne.
12. Pistolet de pulvérisation électrostatique selon l'une des revendications 1 à 9, caractérisé par le fait que l'électrode (612) consiste en une pièce de tôle découpée, configurée en étoile.
13. Pistolet de pulvérisation électrostatique selon l'une des revendications 3 à 12, caractérisé par le fait qu'une chicane (30), disposée en amont de l'embouchure, est en communication avec le canal (26) du tube interne par l'intermédiaire d'un canal (31) similaire à un interstice annulaire.
14. Pistolet de pulvérisation électrostatique selon la revendication 13, caractérisé par le fait que la chicane (30) est enfilée, par déclic, sur un tronçon antérieur élastique d'un support (28) emboîté dans le tube interne (9).
15. Pistolet de pulvérisation électrostatique selon la revendication 14, caractérisé par le fait que le support (28) est enfilé par déclic, par un tronçon postérieur élastique, sur un téton (29) situé dans le tube interne (9).
EP86117697A 1986-01-16 1986-12-18 Pistolet de pulvérisation électrostatique particulièrement pour poudres Expired - Lifetime EP0230624B2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86117697T ATE46460T1 (de) 1986-01-16 1986-12-18 Elektrostatische spruehpistole, insbesondere fuer pulver.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3601081 1986-01-16
DE19863601081 DE3601081A1 (de) 1986-01-16 1986-01-16 Elektrostatische spruehpistole, insbesondere fuer pulver

Publications (3)

Publication Number Publication Date
EP0230624A1 EP0230624A1 (fr) 1987-08-05
EP0230624B1 EP0230624B1 (fr) 1989-09-20
EP0230624B2 true EP0230624B2 (fr) 1993-03-17

Family

ID=6291941

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86117697A Expired - Lifetime EP0230624B2 (fr) 1986-01-16 1986-12-18 Pistolet de pulvérisation électrostatique particulièrement pour poudres

Country Status (6)

Country Link
US (1) US4765544A (fr)
EP (1) EP0230624B2 (fr)
JP (1) JPS63119863A (fr)
AT (1) ATE46460T1 (fr)
BR (1) BR8700148A (fr)
DE (1) DE3601081A1 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3834983A1 (de) * 1988-10-14 1990-04-19 Kopperschmidt Mueller & Co Spritzpistole
US5620138A (en) * 1994-11-09 1997-04-15 Nordson Corporation Powder coating gun mounted diffuser and air cooled heat sink in combination with low flow powder pump improvements
DE19542863A1 (de) * 1995-11-17 1997-05-22 Abb Research Ltd Pulversprüheinrichtung
US5895622A (en) * 1997-04-07 1999-04-20 Purdue Research Foundation Method and apparatus for composite manufacture
US6375094B1 (en) * 1997-08-29 2002-04-23 Nordson Corporation Spray gun handle and trigger mechanism
US6467705B2 (en) * 2001-01-29 2002-10-22 The Easthill Group, Inc. Tribo-corona powder application gun
US6669115B2 (en) * 2002-02-07 2003-12-30 Tai-Yen Sun Vortex twin-fluid nozzle with self-cleaning pintle
US6874712B2 (en) * 2002-09-27 2005-04-05 Abb Inc. Swirl gun for powder particles
DE102006031888B4 (de) * 2006-07-07 2009-01-29 Ilt Industrie-Luftfiltertechnik Gmbh Ionisationselement und elektrostatischer Filter
US9683503B2 (en) * 2015-08-17 2017-06-20 Caterpillar Inc. Managing load sharing among multiple engines
CN107262320B (zh) * 2017-06-26 2023-08-29 中信戴卡股份有限公司 一种混线式轮毂螺栓孔自动清粉系统及组合式清粉枪
CN115608530B (zh) * 2022-09-28 2023-09-05 广东水电二局股份有限公司 一种大直径钢管熔喷防腐用阵列式喷头

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Also Published As

Publication number Publication date
US4765544A (en) 1988-08-23
DE3601081C2 (fr) 1992-01-16
EP0230624A1 (fr) 1987-08-05
EP0230624B1 (fr) 1989-09-20
JPS63119863A (ja) 1988-05-24
BR8700148A (pt) 1987-12-01
JPH0556188B2 (fr) 1993-08-18
DE3601081A1 (de) 1987-07-23
ATE46460T1 (de) 1989-10-15

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