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EP2638975B1 - Support d'électrode et buse à jet pour un pistolet de pulvérisation de poudre fonctionnant à haute tension - Google Patents

Support d'électrode et buse à jet pour un pistolet de pulvérisation de poudre fonctionnant à haute tension Download PDF

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Publication number
EP2638975B1
EP2638975B1 EP12405028.7A EP12405028A EP2638975B1 EP 2638975 B1 EP2638975 B1 EP 2638975B1 EP 12405028 A EP12405028 A EP 12405028A EP 2638975 B1 EP2638975 B1 EP 2638975B1
Authority
EP
European Patent Office
Prior art keywords
electrode holder
powder
snap
groove
spray gun
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.)
Active
Application number
EP12405028.7A
Other languages
German (de)
English (en)
Other versions
EP2638975A2 (fr
EP2638975A3 (fr
Inventor
Hanspeter Dietrich
René Schmid
Gilbert Lutz
Kurt Seitz
Urban Bischofberger
Patrik Studerus
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.)
Wagner International AG
Original Assignee
Wagner International AG
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 Wagner International AG filed Critical Wagner International AG
Priority to PL12405028T priority Critical patent/PL2638975T3/pl
Priority to EP12405028.7A priority patent/EP2638975B1/fr
Priority to US13/792,556 priority patent/US9616440B2/en
Publication of EP2638975A2 publication Critical patent/EP2638975A2/fr
Publication of EP2638975A3 publication Critical patent/EP2638975A3/fr
Application granted granted Critical
Publication of EP2638975B1 publication Critical patent/EP2638975B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B05B5/053—Arrangements for supplying power, e.g. charging power
    • B05B5/0533—Electrodes specially adapted therefor; Arrangements of electrodes
    • 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 electrode holder for a powder spray gun that can be operated with high voltage and a powder spray gun with an electrode holder.
  • the workpiece to be coated is coated with a powder spray gun with a layer of electrostatically charged powder in a first step.
  • the workpiece coated with the powder is heated until the powder melts on the surface of the workpiece and forms a closed layer. After the workpiece has cooled, this layer is a closed protective layer that adheres firmly to the workpiece.
  • an electrode holder with an electrode under high voltage in the powder spray gun. The powder flows past the electrode and is electrostatically charged.
  • the high voltage applied to the electrode is usually between 20 kV and 80 kV.
  • an explosive powder cloud can occur in the vicinity of the powder spray gun during operation.
  • the powder spray gun must not pose any risk of explosion. Ignitable partial discharges (discharges in the ionized air) and / or ignitable flashovers (discharges to a significantly lower potential or to the mass) must therefore be prevented. Partial discharges and arcing can occur if the distance depends on the height of the high voltage and the field strength.
  • various parts of a powder spray gun can be removed by hand, i.e. without the aid of a tool. These parts are referred to below as manually removable parts. These parts can be removed manually because maintenance work, such as cleaning work, can be carried out quickly and easily.
  • the manufacturer of the spray gun stipulates that the powder spray gun may only be operated when assembled. If the powder spray gun is operated without the manually removable parts, the level of protection should still be maintained.
  • EP 1 752 224 B1 an electrode holder for a powder spraying device is known.
  • the electrode holder has a powder channel and a web arranged in the powder channel for holding an electrode.
  • the upstream section of the powder channel is designed as a sleeve into which a powder tube can be pushed.
  • An electrical contact is also provided, which is arranged on the upstream end face of the sleeve.
  • Another electrode holder according to the prior art is in EP 1 084 759 described.
  • An object of the invention is to provide an electrode holder for a powder spray gun that can be operated with high voltage and a powder spray gun with an electrode holder, wherein it is ensured that the powder spray gun poses no danger to the user either in the assembled or disassembled state.
  • the dismantled state is the state in which the parts that can be removed manually, that is to say without tools, are removed.
  • the electrode holder according to the invention for a powder spray gun that can be operated with high voltage comprises a powder channel and a web arranged in the powder channel for holding a high-voltage electrode.
  • an annular groove arranged concentrically to the powder channel is provided, which is open on the downstream side.
  • the annular groove forms a labyrinth for the high voltage with an annular web of a union nut which projects into the annular groove and which serves to lock the electrode holder.
  • the powder spray gun according to the invention which can be operated with high voltage, has one of the electrode holders described above.
  • a union nut with a web is provided, which forms a labyrinth for the high voltage with the annular groove of the electrode holder.
  • the annular groove has a width and depth such that when the annular web of the union nut projects into the annular groove, an air gap arises between the walls of the annular groove and the web.
  • a snap groove is provided outside the powder channel in order to form a snap connection with a snap hook of a union nut, which serves to lock the electrode holder.
  • the snap groove is open in the radial direction.
  • a guide lug extending in the axial direction is provided on the outside of the powder channel and that Snap groove is embedded in the guide lug.
  • the guide nose can have two different functions. On the one hand, it serves to guide a spray nozzle so that it cannot twist relative to the electrode holder. On the other hand, it serves as a counterpart for the snap hook of the union nut.
  • an axial seal arranged concentrically to the powder channel is provided.
  • an electrically conductive contact ring is provided.
  • a channel is advantageously provided in the electrode holder, in which a plurality of resistors are arranged, via which the contact ring is connected to the high-voltage electrode.
  • a wedge can be provided in the electrode holder, which can be plugged onto the upstream end of the web.
  • the wedge in the electrode holder can have a width of 13.0 to 13.4 mm and preferably 13.2 mm.
  • the wedge in the electrode holder can have a length between 10 and 20 mm.
  • the radius of the wedge is between 10.0 mm and 11.0 mm, preferably 10.4 mm.
  • the powder spray gun which can be operated with high voltage, comprises an electrode holder as described above and a union nut with a snap hook.
  • the Snap hook forms a snap connection with the snap groove of the electrode holder.
  • a jet nozzle which has a powder channel which opens into a nozzle opening on the downstream side.
  • the blasting nozzle has a radial, externally open snap groove in order to form a snap connection with a snap hook of a union nut which serves to lock the blasting nozzle.
  • the snap groove of the jet nozzle is designed such that the walls of the snap groove of the jet nozzle with the walls of the snap groove of the electrode holder have no axial offset from one another.
  • a slot is provided on the upstream side, into which a guide lug of the electrode holder protrudes.
  • the slot extends from the upstream end of the powder channel to beyond the snap groove.
  • a displaceable sleeve and a locking mechanism can be provided in the jet nozzle, with which the sleeve can snap onto the powder channel.
  • the snap hook of the union nut forms a snap connection with the snap groove of the jet nozzle.
  • FIG. 1 shows a possible embodiment of a powder spray gun 1 according to the invention in a three-dimensional view in the assembled state.
  • the powder spray gun 1 is also referred to below as a spray gun or only as a gun.
  • the spray gun 1 is designed as a manual spray gun and for this purpose comprises a gun housing 2 with a handle 3 with which the operating personnel can hold the gun.
  • the handle 3 has a trigger 4 with which the coating process can be started and ended.
  • At the lower end of the handle 4 there is a powder connection 8, via which the gun 1 is supplied with powder, and an electrical connection 7, via which a high-frequency low voltage is supplied to the gun 1.
  • a high-voltage generator which comprises a transformer and a downstream high-voltage cascade, and which transforms the high-frequency low voltage into a high voltage.
  • Control and information signals can also be routed from the control device (not shown in the figure) to the gun via the electrical connection 7, and control and information signals can also be routed from the gun to the control device.
  • the coating powder, or powder for short is sprayed via a spray nozzle 5, which is located at the downstream end of the gun 1.
  • the spray nozzle 5 is also referred to below as a jet nozzle or in short as a nozzle. It is by means of a union nut 6, the is screwed onto the downstream end of the gun 1.
  • FIG. 2 shows the powder spray gun according to the invention in a three-dimensional view in a partially disassembled state.
  • the spray nozzle 1 is designed as a flat jet nozzle.
  • the downstream section of the gun 1 comprises a substantially cylindrical housing section 2.1, which is referred to below as the downstream housing section 2.1. This is designed so that the sleeve-shaped union nut 6 can be pushed over it and screwed to it.
  • the downstream housing section 2.1 has an external thread 2.2 at its downstream end and the union nut 6 has a corresponding internal thread.
  • a sleeve 2.3 which is part of the housing section 2.1.
  • the sleeve 2.3 forms a receptacle for a powder tube 14 on the upstream side (see Figure 4 ) and on the downstream side a receptacle for the powder channel 10 of the electrode holder 9.
  • the stop on the inside of the sleeve 2.3 can form the depth stop for the electrode holder 9.
  • Figure 3 shows the downstream part of the powder spray gun 1 according to the invention in longitudinal section along the section line AA and Figure 4 shows the downstream part of the powder spray gun 1 according to the invention in longitudinal section along the section line BB.
  • Figure 5 shows a first embodiment of an inventive Spray nozzle 5 and a first embodiment of an electrode holder 9 according to the invention for the powder spray gun 1 in a three-dimensional view.
  • Figure 6 shows the electrode holder 9 according to the invention in a three-dimensional view in longitudinal section along the section line BB.
  • the union nut 6 is screwed onto the downstream section of the gun housing 2.1 and has an internal thread 62 in its downstream section for this purpose.
  • the union nut 6 tapers conically towards the downstream end.
  • annular web 61 inside the union nut 6, which is arranged concentrically to the longitudinal axis L of the powder channel 14, 10, 51.
  • the electrode holder 9 has a powder channel 10 which is arranged concentrically to the longitudinal axis L.
  • the electrode holder 9 also has a holding web 23 which is arranged inside the powder channel 10. On its upstream side, the holding web 23 carries a powder wedge 30 and on its downstream side it has an electrode channel 12.
  • a high-voltage electrode 11 is located within the electrode channel 12, which is also referred to in the following as an electrode.
  • the geometry of the holding web 23 is optimized in such a way that the powder can flow through the powder channel 10 as freely as possible and sintering of the powder on the holding web 23 and the formation of powder lumps are avoided.
  • the holding web 23 is designed such that the powder wedge 30 or, in short, the wedge is placed on the holding web 23 and also removed again can be.
  • the electrode holder 9 also has a wall 25 which extends in the radial direction and which is supported on the outside on the powder channel 10 and on the outside thereof carries an outer ring 26 which is concentric with the longitudinal axis L.
  • the outer ring 26 serves, among other things, to center the electrode holder 9 in the downstream housing section 2.1 and seals the interior of the gun housing 2 downstream.
  • the outer ring 26 has a stop, to which an elastic O-ring 24 connects on its upstream side. The O-ring 24 and the stop thus form an axial seal.
  • a contact ring 19 made of a conductive material.
  • a conductive plastic or rubber, for example, is suitable for this.
  • the contact ring 19 is connected to the electrode 11 via electrical resistors 29.
  • the resistors 29 are arranged in a channel 91 which passes through the wall 25, the powder channel 10 and the holding web 23 and opens into the electrode channel 12.
  • the high-voltage line running inside the gun 1 is led out at the downstream end of the gun housing 2 and is guided onto a contact pin 27. If the electrode holder 9 is installed in the gun 1, the contact pin 27 is pressed onto the contact ring 19 of the electrode holder 9 by means of a spring 28 and thus ensures that the high voltage is securely applied to the contact ring 19.
  • the orientation of the electrode holder 9 is irrelevant. This means that the electrode holder 9 can be rotated around its longitudinal axis L as desired, and nevertheless safe and error-free electrical contacting is ensured.
  • annular web protrudes 61 of the union nut 6 into the groove 13 of the electrode holder 9.
  • the geometry of the annular web 61 and the groove 13 are selected such that there is a first air gap between the wall 21 of the outer ring 26 and the web 61 and between the wall 22 of the inner ring 20 and the web 61 there is a second air gap.
  • the web 61 and the groove 13 are also selected in depth so that there is an air gap. This creates a labyrinth for the high voltage between the high voltage electrode 11 and the outside of the union nut 6, that is to say an extension of the distance or the air gap.
  • the electrode holder 9 also has on its downstream side two lugs 15 extending parallel to the longitudinal axis. In each of the two lugs 15 there is a groove 16 for a snap connection, which is also referred to as snap groove 16 below.
  • the union nut 6 has a correspondingly designed web with snap hooks 60 in the downstream section. Once the electrode holder 9 is pushed all the way forward into the union nut 6, the snap hook 60 of the union nut 6 snaps into the snap groove 16 of the electrode holder 9 and thus forms a positive connection between the electrode holder 9 and the union nut 6. The electrode holder 9 is thus in the Union nut 6 fixed in the axial direction.
  • the snap connection is designed such that the electrode holder 9 can still be rotated about its longitudinal axis L in the union nut 6.
  • the snap hook 60 of the union nut 6 is ring-shaped and has one or more slots 63.
  • the slot or slots 63 extend in the axial direction and interrupt the annular snap hook 60.
  • the annular snap hook 60 is divided into several segments and the resilient property of the annular snap hook 60 is reinforced.
  • the width of the slots 63 is advantageously smaller than the width of the guide lugs 15 of the electrode holder 9.
  • the ring which carries the snap hook 60 is also possible to design the ring which carries the snap hook 60 to be thin-walled in order to improve the springy property of the snap hook 60.
  • the two lugs 15 protrude into a slot 55 of the spray nozzle 5. This ensures that the nozzle slot 50 of the spray nozzle always has the same orientation with respect to the retaining web 23 and the wedge 30. If the electrode holder 9 is rotated about its longitudinal axis L, the spray nozzle 5 and the nozzle slot consequently also rotate 50 with, so that the orientation of the nozzle slot 50 relative to the wedge 30 remains the same. This has the advantage that - regardless of the orientation of the nozzle slot 50 - the powder jet is of constant quality and a reproducible powder jet is guaranteed.
  • the nozzle slot 50 creates a flat spray. For this reason, the nozzle 5 is also referred to as a flat jet nozzle.
  • the spray nozzle 5 also has a snap groove 53 arranged concentrically with the powder channel 51 of the nozzle 5, the position and width of which is defined by the two walls 56 and 57.
  • the slot 55 begins at the upstream end of the spray nozzle 5 and extends in the longitudinal direction beyond the snap groove 53.
  • the part of the slot 55 which extends beyond the snap groove 53 serves to receive the downstream bead of the snap nose 15 of the electrode holder 9 53 of the nozzle 5 and thus forms a positive connection between the nozzle 5 and the union nut 6.
  • the nozzle 5 is thus fixed in the union nut 6 so that the nozzle no longer fall out of the union nut, but nevertheless in the union nut 6 around it Longitudinal axis L can be rotated.
  • the powder spray gun 1 In this disassembled state, the powder spray gun 1 is no longer in the intended operating state. Rather, this condition is a maintenance condition. If the powder spray gun 1 has not also been disconnected from the powder and voltage supply, it can nevertheless generate a powder jet. However, this does not correspond to the powder jet intended for powder coating.
  • a sleeve 52 which can be displaced in the axial direction. With it, the powder spray angle can be set. The further the sleeve 52 is pushed towards the downstream end of the spray nozzle 5, the smaller the angle at which the powder is sprayed. So that the sleeve 52 engages in a certain position on the spray nozzle 5, the sleeve 52 has an annular bead on its inside and the spray nozzle 5 has a corresponding annular recess 54. The sleeve 52 can thus be fixed on the spray nozzle 5 in a specific, defined position in order to set a specific powder spray angle. As soon as the sleeve 52 engages on the nozzle 5, a reproducible powder spray angle is ensured. Another advantage is that the sleeve 52 is securely mounted on the spray nozzle 5 by the locking mechanism.
  • the locking mechanism can also be designed as follows. Instead of attaching the bead to the sleeve 52 and the bulge to the spray nozzle 5, the bead can also be attached to the Spray nozzle 5 and the bulge on the sleeve 52 may be provided.
  • FIG 7a shows in a three-dimensional view a second embodiment of the spray nozzle 500, which is loosely attached to a second embodiment of the electrode holder 900 according to the invention.
  • the electrode holder 900 differs from the electrode holder 9 particularly in the design of the electrode channel 912. Compared to the electrode channel 12, the electrode channel 912 is extended. At its downstream end there is a receptacle 913 for a baffle plate 75 which, as in FIG Figure 18 shown, can be formed.
  • the second embodiment of the spray nozzle 500 is not like that in FIGS Figures 1 to 5 Shown flat jet nozzle 5, but designed as a round jet nozzle.
  • the omnidirectional nozzle 500 shown differs from the flat jet nozzle 5 essentially in that the nozzle opening 501 is not slit-shaped but round and the nozzle does not have a sleeve on the downstream section for adjusting the spray angle. Instead, the round nozzle opening 501 connects to the Figures 13 to 18 shown baffle plate 75. This version does not produce a flat, but a conical powder jet.
  • the electrode holder is mentioned below. However, the following section relates to all embodiments of the electrode holders 9 and 900.
  • a tool 70 is helpful which, as in FIG Figure 8 shown, is trained.
  • the pull-off gripper 71 of the tool 70 is pushed into the powder channel 10 of the electrode holder from the upstream side until the pull-off gripper 71 engages on the wedge 30. The tool 70 can then be pulled out together with the wedge 30.
  • the wedge 30 is inserted into the receptacle 72 of the tool 70 and the receptacle 72 is then pushed into the powder channel 10 of the electrode holder until the wedge 30 is firmly seated on the holding web 23.
  • the tool 70 can then be pulled out of the powder channel 10 again.
  • the tool 70 can also be used to align the flat jet nozzle 5, ie to be able to rotate it.
  • the tool 70 comprises a receptacle 73 with a nose 74 in the middle.
  • the receptacle 73 is plugged onto the flat jet nozzle 5 such that the nose 74 projects into the nozzle slot 50.
  • Figure 12 shows the downstream part of the powder spray gun 1 with the tool 70 placed on the spray nozzle 5.
  • the union nut 6 is first loosened somewhat. As soon as the spray nozzle 5 has been turned into the desired position, the union nut 6 is screwed on again by hand.
  • Figure 9 shows the downstream part of the powder spray gun 1 immediately after the union nut 6 was unscrewed.
  • the snap connections ensure that the flat jet nozzle 5 and also the electrode holder 9 remain in the union nut 6, that is to say they are removed together with the gun 1.
  • the snap hook 60 of the union nut 6 jumps out of the snap groove 53 of the nozzle 5 and the snap groove 16 of the electrode holder 9.
  • the nozzle 5 and the electrode holder 9 fall out of the union nut 6. Now the three components can be cleaned, serviced, checked and, if necessary, one or the other component can be replaced.
  • FIG 10 shows the union nut 6, the flat jet nozzle 5, the electrode holder 9 and the downstream part of the powder spray gun 1 before assembly.
  • the electrode holder 9 is usually first inserted into the mouth of the spray gun 1 (see Figure 11 ). Then the nozzle 5 is placed on the electrode holder 9. The electrode holder 9 and the spray nozzle 5 are only loosely connected to the gun 1. The union nut 6 is then screwed onto the gun 1. As soon as the union nut 6 is screwed far enough onto the gun 1, the snap hook 60 of the union nut 6 snaps into the snap grooves 53 and 16 of the nozzle 5 and the electrode holder 9. The union nut 6 is firmly screwed on by hand. The gun 1 is now ready for use again.
  • Figure 13 shows the downstream part of the powder spray gun 1 with the second embodiment of the inventive Spray nozzle 500 in a three-dimensional view.
  • FIG 14 shows the downstream part of the powder spray gun 1 immediately after the union nut 6 has been unscrewed and the baffle plate 70 has been pulled off. Then one presses in the axial direction on the nozzle 500. As soon as the force is sufficiently large, the nozzle 500 and the electrode holder 900 fall out of the union nut 6.
  • Figure 15 shows the baffle plate 70, the union nut 6, the jet nozzle 500, the electrode holder 900 and the downstream part of the powder spray gun 1 in the disassembled state or before assembly.
  • Figure 16 shows the baffle plate 70 and the union nut 6 in the not yet assembled state and the powder spray gun 1 with a loosely installed electrode holder 900 and jet nozzle 500. To reassemble the gun, proceed as described above.
  • the nozzle 500 and the electrode holder 9 can first be pressed so firmly into the union nut 6 that they snap into place. You can then screw the cap nut 6 equipped in this way onto the spray gun 1. The gun 1 is now ready for use again.
  • Figure 17 shows the wedge 30 which can be inserted into the powder channel 10 of the electrode holder 9 or 900 in a three-dimensional view.
  • the wedge 30 has a thickness DK between 3.2 mm and 4.0 mm.
  • FIG 18 shows three different embodiments 75, 76 and 77 of the baffle plate in a three-dimensional view.
  • the three baffle plates 75, 76 and 77 essentially differ in size and baffle area. With the baffle plate 77, the powder jet is least widened and with the baffle plate 75 the most widened. The baffle plate 75 thus generates a spray cone with the largest spray angle.
  • FIG 19 shows an embodiment of the baffle plate 75 in the exploded view.
  • Figure 20 shows the baffle plate 75 in longitudinal section.
  • the baffle plate 75 comprises a baffle plate housing 80 with a bore or opening 80.1 which is plugged onto the receptacle 913 of the electrode holder 900.
  • At the downstream end of the baffle plate 75 there is a clamping ring 78 with an O-ring 79.
  • the receptacle 913 of the electrode holder 900 is designed such that the O-ring 79 can snap into it.
  • the clamping ring 78 is held in the baffle housing 80 via a snap connection.
  • Figure 21 shows the pistol grip 3 with the powder hose connection 8, the atomizing air connection 105 and the electrical connection 7 in longitudinal section.
  • Figure 22 shows the lower part of the pistol grip 3 with the various connections in the exploded view.
  • Figure 23 shows the pistol grip 3 in the area of the connection housing 103 in cross section.
  • the connection housing 103 carries the connection cable 104 with the electrical connection 7, the hose nipple 105 and the powder connection 8.
  • the connection housing 103 is generally screwed to the pistol grip 3. With the aid of a slide 100, the powder connection 8 can be locked or removed from the pistol grip 3. To lock the powder connection 8 on the pistol grip 3, one simply presses the powder connection 8 into the opening of the pistol grip 3 provided for this purpose. The powder connection 8 then snaps into place.
  • the slider 100 is equipped with a spring 102, so that the slider 100 is pressed into a defined position when the push button 101 is not pressed.
  • the spray gun 1 can also be designed as an automatic gun.
  • the handle 3 is omitted.
  • An automatic gun is understood to mean a spray gun, which is not held by hand, but is, for example, attached to a robot or a linear guide or permanently installed.
  • the spray gun 1 can also be designed as a powder cup gun.
  • a powder cup including the powder injector is attached directly above the spray gun, for example.
  • a gun extension can also be arranged between the downstream section 2.1 of the gun housing 2 and the electrode holder.
  • the gun extension includes a powder tube. Its upstream end can be screwed onto the thread 2.2 of the gun housing.
  • the downstream end of the powder tube is constructed similarly to that of the downstream section 2.1 and receives the electrode holder 9 and the nozzle 5.
  • the union nut is screwed onto the downstream end of the gun extension. With such an extended spray gun, for example, larger depressions can be coated in a workpiece.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)

Claims (16)

  1. Support d'électrode (9), convenant à la réception d'une buse de pulvérisation, pour un pistolet de pulvérisation de poudre pouvant être exploité avec une haute tension,
    - dans lequel un canal de poudre (10) est prévu,
    - dans lequel une entretoise (23) pour le maintien d'une électrode haute tension (11) est disposée dans le canal de poudre (10),
    - dans lequel une rainure annulaire (13) disposée de manière concentrique au canal de poudre (10) qui est ouverte sur le côté aval est prévue,
    - dans lequel la rainure annulaire (13) est réalisée de telle sorte qu'un labyrinthe pour la haute tension peut être formé avec elle et une entretoise annulaire (61) d'un écrou d'accouplement (6) qui sert au blocage du support d'électrode (9).
  2. Support d'électrode selon la revendication 1,
    dans lequel la rainure annulaire (13) présente une largeur (B) et profondeur (T) telles que, lorsque l'entretoise annulaire (61) de l'écrou d'accouplement (6) fait saillie dans la rainure annulaire (13), une fente d'aération apparaît entre les parois (21, 22) de la rainure annulaire (13) et l'entretoise (61).
  3. Support d'électrode selon une des revendications précédentes,
    - dans lequel une rainure encliquetable (16) est prévue en dehors du canal de poudre (10),
    - dans lequel la rainure encliquetable (16) est prévue pour former une connexion encliquetable avec un crochet encliquetable (60) d'un écrou d'accouplement (6) qui sert au blocage du support d'électrode (9).
  4. Support d'électrode selon la revendication 3, dans lequel la rainure encliquetable (16) est ouverte dans la direction radiale.
  5. Support d'électrode selon la revendication 4,
    - dans lequel un nez de guidage (15) s'étendant dans la direction axiale est prévu sur le côté externe du canal de poudre (10), et
    - dans lequel la rainure encliquetable (16) est introduite dans le nez de guidage (15).
  6. Support d'électrode selon une des revendications précédentes,
    dans lequel un joint axial (24) disposé de manière concentrique au canal de poudre (10) est prévu.
  7. Support d'électrode selon une des revendications précédentes,
    dans lequel une bague de contact (19) électriquement conductrice est prévue.
  8. Support d'électrode selon la revendication 7,
    dans lequel un canal (91) dans lequel plusieurs résistances (29) par le biais desquelles la bague de contact (19) est connectée à l'électrode haute tension (11) sont disposées, est prévu.
  9. Support d'électrode selon une des revendications précédentes,
    dans lequel une clavette (30) qui peut être enfichée sur l'extrémité amont de l'entretoise (23) est prévue.
  10. Support d'électrode selon la revendication 9,
    dans lequel la clavette (30) présente une largeur de 13,2 mm avec une tolérance de +- 0,2 mm.
  11. Support d'électrode selon la revendication 9 ou 10, dans lequel la clavette (30) présente une longueur comprise entre 10 et 20 mm.
  12. Pistolet de pulvérisation de poudre (1) pouvant être exploité avec une haute tension,
    - dans lequel un support d'électrode (9) selon une des revendications précédentes est prévu, et
    - dans lequel un écrou d'accouplement (6) avec une entretoise annulaire (61) qui forme un labyrinthe pour la haute tension avec la rainure annulaire (13) du support d'électrode (9) est prévu.
  13. Pistolet de pulvérisation de poudre (1) pouvant être exploité avec une haute tension,
    - dans lequel un support d'électrode (9) selon une des revendications 3 à 11 est prévu, et
    - dans lequel un écrou d'accouplement (6) avec un crochet encliquetable (60) qui forme une connexion encliquetable avec la rainure encliquetable (16) du support d'électrode (9) est prévu.
  14. Pistolet de pulvérisation de poudre selon la revendication 13,
    - dans lequel une buse de projection (5) avec un canal de poudre (51) qui débouche sur le côté aval dans une ouverture de buse (50) est prévue,
    - dans lequel la buse de projection (5) présente une rainure encliquetable (53) ouverte vers l'extérieur pour former une connexion encliquetable avec le crochet encliquetable (60) de l'écrou d'accouplement (6) qui sert au blocage de la buse de projection (5) .
  15. Pistolet de pulvérisation de poudre selon la revendication 14,
    dans lequel la rainure encliquetable (53) de la buse de projection (5) est réalisée de sorte que les parois (56, 57) de la rainure encliquetable (53) de la buse de projection (5) ne présentent avec les parois (17, 18) de la rainure encliquetable (16) du support d'électrode (9) aucun décalage axial les unes par rapport aux autres.
  16. Pistolet de pulvérisation de poudre selon la revendication 14 ou 15,
    - dans lequel une fente (55) dans laquelle un nez de guidage (15) du support d'électrode (9) fait saillie est prévue sur le côté amont de la buse de projection (5), et
    - dans lequel la fente (55) s'étend de l'extrémité amont du canal de poudre (51) jusqu'au-delà de la rainure encliquetable (53).
EP12405028.7A 2012-03-14 2012-03-14 Support d'électrode et buse à jet pour un pistolet de pulvérisation de poudre fonctionnant à haute tension Active EP2638975B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
PL12405028T PL2638975T3 (pl) 2012-03-14 2012-03-14 Uchwyt elektrody i dysza natryskowa do pistoletu proszkowego pracującego z wysokim napięciem
EP12405028.7A EP2638975B1 (fr) 2012-03-14 2012-03-14 Support d'électrode et buse à jet pour un pistolet de pulvérisation de poudre fonctionnant à haute tension
US13/792,556 US9616440B2 (en) 2012-03-14 2013-03-11 Electrode holder and jet nozzle for a powder spray gun operable at high voltage

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12405028.7A EP2638975B1 (fr) 2012-03-14 2012-03-14 Support d'électrode et buse à jet pour un pistolet de pulvérisation de poudre fonctionnant à haute tension

Publications (3)

Publication Number Publication Date
EP2638975A2 EP2638975A2 (fr) 2013-09-18
EP2638975A3 EP2638975A3 (fr) 2014-04-30
EP2638975B1 true EP2638975B1 (fr) 2020-02-26

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ID=46001097

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EP12405028.7A Active EP2638975B1 (fr) 2012-03-14 2012-03-14 Support d'électrode et buse à jet pour un pistolet de pulvérisation de poudre fonctionnant à haute tension

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Country Link
US (1) US9616440B2 (fr)
EP (1) EP2638975B1 (fr)
PL (1) PL2638975T3 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
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CN104826755B (zh) * 2015-04-08 2017-01-25 江苏大学 一种静电雾化喷嘴
DE102015007882A1 (de) * 2015-06-22 2016-12-22 Tesat-Spacecom Gmbh & Co.Kg Hochspannungsverbinder
US20190060938A1 (en) * 2017-08-24 2019-02-28 Electrostatic Spraying Systems, Inc. System and nozzle apparatus for electrostatic spraying
DE102019105244A1 (de) * 2019-03-01 2020-09-03 Gema Switzerland Gmbh Heckschale für eine sprühpistole sowie sprühpistole mit einer solchen heckschale
CN113710368B (zh) 2019-04-05 2023-01-06 固瑞克明尼苏达有限公司 静电喷枪上的外部充电探针的安装
USD959606S1 (en) * 2019-09-06 2022-08-02 Gema Switzerland Gmbh Spray gun
EP4215281B1 (fr) * 2022-01-19 2024-12-18 Wagner International AG Buse de pulvérisation de poudre permettant de pulvériser du poudre de revêtement, combinaison de porte-électrode et de buse de pulvérisation de poudre, ainsi qu'applicateur de pulvérisation pourvu de buse de pulvérisation de poudre
CN120362086B (zh) * 2025-06-19 2025-09-23 常州铭捷智能装备有限公司 一种具有新型保护型安装结构的喷射装置

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DE19621072A1 (de) * 1996-05-24 1997-11-27 Gema Volstatic Ag Elektrostatische Sprühvorrichtung
JPH10314624A (ja) * 1997-05-14 1998-12-02 Nippon Parkerizing Co Ltd 静電粉体塗装ガン
US6375094B1 (en) * 1997-08-29 2002-04-23 Nordson Corporation Spray gun handle and trigger mechanism
US6478242B1 (en) * 1999-09-16 2002-11-12 Nordson Corporation Powder spray gun
US20030006321A1 (en) * 2001-07-06 2003-01-09 Mather Brian D. Tubular voltage multiplier powder gun
US7748651B2 (en) * 2003-03-27 2010-07-06 Asahi Sunac Corporation Electrostatic coating spray gun
DE202005012863U1 (de) 2005-08-12 2005-10-27 J. Wagner Ag Elektrodenhalter für eine Pulversprühvorrichtung
ES2699955T3 (es) * 2011-05-23 2019-02-13 Sulzer Mixpac Ag Combinación de un mezclador pulverizador estático con una pieza intermedia

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Also Published As

Publication number Publication date
PL2638975T3 (pl) 2020-08-24
EP2638975A2 (fr) 2013-09-18
US9616440B2 (en) 2017-04-11
US20130240646A1 (en) 2013-09-19
EP2638975A3 (fr) 2014-04-30

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