EP3582904B1 - Injecteur a poudre avec buse a venturi - Google Patents

Injecteur a poudre avec buse a venturi Download PDF

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Publication number
EP3582904B1
EP3582904B1 EP17801703.4A EP17801703A EP3582904B1 EP 3582904 B1 EP3582904 B1 EP 3582904B1 EP 17801703 A EP17801703 A EP 17801703A EP 3582904 B1 EP3582904 B1 EP 3582904B1
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EP
European Patent Office
Prior art keywords
nozzle
powder
collecting
channel
injector
Prior art date
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Active
Application number
EP17801703.4A
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German (de)
English (en)
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EP3582904A1 (fr
Inventor
Marco Sanwald
Roger TOBLER
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Gema Switzerland GmbH
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Gema Switzerland GmbH
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Publication date
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Publication of EP3582904A1 publication Critical patent/EP3582904A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1472—Powder extracted from a powder container in a direction substantially opposite to gravity by a suction device dipped into the powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/0075—Nozzle arrangements in gas streams

Definitions

  • the present invention relates to a powder feed injector with a Venturi nozzle arrangement and a Venturi nozzle arrangement for powder feed injectors.
  • the invention relates to powder feed injectors for conveying coating powder with a driving nozzle and a catching nozzle, the catching nozzle having a jet catching channel which is axially opposite the driving nozzle at a distance.
  • This arrangement of propelling and collecting nozzles is also referred to herein as a "Venturi nozzle arrangement”.
  • Nozzle arrangements of this type are used in powder feed injectors which, using the so-called Venturi effect, convey fluidized coating powder in particular from a powder storage container with the help of conveying air and feed it through the catch nozzle via, for example, a powder feed hose to a coating gun or similar device for spraying coating powder.
  • the catching nozzle which is usually designed as an elongated hollow body, forms a so-called jet catching channel in its interior, into which the powder-air mixture to be conveyed is introduced.
  • the jet catching channel of the catching nozzle is located upstream in the axial direction opposite a driving or conveying jet nozzle through which motive or conveying air is pressed into the catching nozzle. Due to the relatively small diameter of the propulsion or conveying jet nozzle, an air flow is formed high speed, as a result of which a negative pressure is formed in an immediately adjacent powder feed channel which is connected to the powder container. Due to the negative pressure, fluidized coating powder is conveyed from the powder storage container in the powder feed channel in the direction of the collecting nozzle and fed through this to the powder feed hose.
  • a powder feed injector of this type with a corresponding Venturi nozzle arrangement is, for example, from FIG WO 2014/170374 or the German Offenlegungsschrift DE 198 24 802 A1 known.
  • Powder feed injectors known from the prior art have the disadvantage that the air stream and the powder particles wear out the propellant nozzle and the catch nozzle and in particular the jet catch channel of the catch nozzle. Due to the abrasive effect of the coating powder, which is passed through the catching nozzle at high speed, the jet catching channel of the catching nozzle in particular is subject to relatively high wear, which is generally noticeable in that the material removal leads to a widening of the jet catching channel, which leads to a pressure drop has the consequence.
  • the propellant nozzle is made of a plastic material, there is a risk that the nozzle opening of the propellant nozzle will widen over time due to the conveying air pressed through the propellant nozzle. If, on the other hand, the nozzle opening of the propellant nozzle is made of metal, which is "harder” than plastic and is therefore subject to less wear, the accumulation and sintering of powder particles on the nozzle mouthpiece cannot usually be prevented, since metal has the disadvantage that the powder particles tend to adhere and sinter on.
  • the aim of the invention is to achieve the object of creating a possibility that, when the collecting nozzle is exchanged routinely or due to defects, it is ensured that the powder feed injector then guarantees particularly efficient and optimized conveyance of coating powder.
  • the collecting nozzle and the driving nozzle are combined and inseparably connected to one another as one component.
  • the term “combined as one component” or “inseparably connected with one another” as used herein is understood to mean a connection between the two components “catching nozzle” and “driving nozzle” which can no longer be released without being destroyed.
  • the catch nozzle and the drive nozzle of the powder feed injector are combined inseparably as one component, it is particularly easy for the user of the powder feed injector to replace the drive nozzle at the same time during a routine or defect-related replacement of the catch nozzle, so that the powder feed injector or the on each other coordinated flow cross-sections in the nozzle arrangement correspond to the originally selected, factory designs. It must be taken into account here that in conventional powder feed injectors the propellant nozzle could only be exchanged - if at all - at a relatively high cost, which in practice was therefore not usually done.
  • the solution according to the invention also enables the powder feed injector to be designed as a so-called “inline injector" in which the coating powder to be conveyed with the powder feed injector is in relation to the longitudinal axis of the jet catching channel is fed axially to the powder feed injector.
  • This embodiment as an "inline injector” has the decisive advantage that the coating powder to be conveyed no longer has to be deflected, or at least hardly has to be deflected, so that - if at all - only slight turbulence and, in particular, less flow resistance arise.
  • This increases the conveying capacity of the powder conveying injector with the same amount of conveying air, and at the same time the powder discharge can be made more uniform in comparison to conventional powder conveying injectors which are not designed as inline injectors.
  • the susceptibility of the nozzle arrangement to wear is significantly reduced, since the degree of turbulence of the coating powder to be conveyed in the powder feed injector is significantly reduced.
  • the invention thus also relates to a powder feed injector for conveying coating powder, which has a driving nozzle and a collecting nozzle, wherein the collecting nozzle has a jet catching channel which is axially opposite the driving nozzle at a distance, and wherein the driving nozzle has a powder inlet which the jet catching channel axially opposite at a distance.
  • the invention finally relates to a Venturi nozzle arrangement for powder feed injectors, the nozzle arrangement having a first area which serves as a driving nozzle and a second area which serves as a catching nozzle, the second area having a channel serving as a jet catching channel having a longitudinal axis, and wherein the first region has a nozzle opening which is axially of the beam-catching channel opposite, wherein the first and second areas of the nozzle arrangement combined as one component are inseparably connected or can be connected to one another.
  • the present invention relates to a powder feed injector for conveying coating powder, wherein the powder feed injector has a driving nozzle and a catching nozzle, and the catching nozzle has a jet catching channel which is axially opposite the driving nozzle at a distance.
  • the collecting nozzle and the driving nozzle are combined and inseparably connected to one another as one component.
  • the propellant nozzle has a powder inlet which is axially opposite the jet catching channel at a distance.
  • the propellant nozzle has a powder inlet which is axially opposite the jet-catching channel at a distance and is aligned with respect to an axis which coincides with a longitudinal axis defined by the jet-catching channel or runs parallel to a longitudinal axis defined by the jet-catching channel.
  • the propellant nozzle has a powder inlet which is aligned with respect to an axis that intersects a longitudinal axis defined by the beam-catching channel, preferably at 90 ° or at an obtuse angle.
  • the present invention relates to a powder feed injector for conveying coating powder, wherein the powder feed injector has a driving nozzle and a catching nozzle, and the catching nozzle has a jet catching channel which is axially opposite the driving nozzle at a distance.
  • the propellant nozzle has a powder inlet which is axially opposite the jet-catching channel at a distance.
  • the collecting nozzle and the driving nozzle are combined and inseparably connected to one another as one component.
  • an injector housing in which at least the propellant nozzle is accommodated, at least in some areas, preferably in a removable or exchangeable manner.
  • the capturing and driving nozzles which are inseparably connected to one another as one component, preferably have at least one seal for sealing the component against the injector housing.
  • an injector housing in which at least the driving nozzle is received at least in some areas, the injector housing having a powder inlet area that can be connected to a powder line, in which a powder inlet channel is formed which is axial with respect to the longitudinal axis of the collecting nozzle and in terms of flow with the powder inlet of the driving nozzle connected is.
  • An axial seal can be provided in the powder inlet channel, in particular in an upstream end region of the powder inlet channel.
  • an injector housing in which the capture and propellant nozzle, which is preferably combined as one component, is accommodated at least in some areas, with a receptacle being formed in the injector housing in which at least one upstream area of the capture and propulsion nozzle, which is preferably combined as one component, is and propellant nozzle is received, wherein the receptacle is circular-cylindrical and is designed axially with respect to the longitudinal axis of the collecting nozzle.
  • a conveying air connection can be provided in the injector housing, which is fluidly connected to the conveying air duct via an annular space formed between the receptacle of the injector housing and the collecting and driving nozzle combined as one component.
  • the propulsion nozzle can have a conveying air inlet which is connected to the conveying air duct in terms of flow and which is arranged and aligned non-axially with respect to the longitudinal axis of the collecting nozzle.
  • the catching and driving nozzle which are preferably combined as one component, can be rotationally symmetrical with respect to the longitudinal axis of the catching nozzle.
  • a powder line connection can also be provided for connecting a powder line, in particular a powder hose, to a downstream end region of the collecting nozzle, wherein the powder line connection is in particular releasably connected to the downstream end region of the collecting nozzle.
  • an injector housing in which the catching and propellant nozzle, which is preferably combined as one component, is received at least in some areas, an upstream end region of the powder line connection being received at least in some areas in the injector housing and releasably connected to the injector housing via a locking device.
  • the catching nozzle can be formed from a first material and the driving nozzle can be formed from a second material, the first material being different from the second material or identical to the second material.
  • the jet catching channel can be designed to be rotationally symmetrical with respect to the longitudinal axis of the catching nozzle.
  • the collecting nozzle can be designed to be rotationally symmetrical with respect to the longitudinal axis.
  • the propellant nozzle can have a propellant nozzle housing with a conveying air channel and a nozzle mouthpiece which is connected in terms of flow to the conveying air channel and which is axially opposite the jet catching channel.
  • the nozzle mouthpiece can be designed as an insert and inseparably connected to the drive nozzle housing.
  • the present invention relates to a Venturi nozzle arrangement for powder feed injectors, the nozzle arrangement having a first area which serves as a driving nozzle and a second area which serves as a catching nozzle, the second area having a channel serving as a jet catching channel with a Has longitudinal axis, and wherein the first region has a nozzle opening which is axially opposite the beam-catching channel, wherein the first and second regions of the nozzle arrangement are united and inseparably connected to one another as one component.
  • the first area serving as a propellant nozzle can have a powder inlet which is at a distance from the channel of the second area serving as a jet-catching channel axially opposite.
  • the nozzle arrangement can preferably be removably or exchangeably received in an injector housing in such a way that at least in some regions at least the first region of the nozzle arrangement is received in the injector housing.
  • the nozzle arrangement can have at least one seal for sealing the nozzle arrangement with respect to the injector housing.
  • the first area serving as a driving nozzle can have a conveying air inlet which is arranged and aligned non-axially with respect to the longitudinal axis of the channel of the second area serving as a beam-catching channel.
  • the nozzle arrangement can be designed to be rotationally symmetrical with respect to the longitudinal axis of the channel serving as a beam-catching channel.
  • a jet pump with a powder feed injector which works according to the injector principle or venturi tube principle.
  • an air jet generates a negative pressure in a negative pressure area, which is formed by the channel widening, which is used to suck the coating powder out of the container or container.
  • the extracted coating powder is carried away by the air jet and conveyed to the spray device.
  • the invention is based on the problem, according to which powder feed injectors of the known type have the disadvantage that the air flow and the powder particles wear out the propellant nozzle and the jet-catching channel. This not only has the disadvantage that, depending on the degree of wear, the powder volume flow (amount of powder conveyed per unit of time) also changes, which results in unequal coating thicknesses and coating qualities on an object to be coated.
  • Venturi nozzle arrangement 100 is particularly suitable for powder feed injectors 50 in order to convey coating powder from a storage container with the aid of conveying air.
  • the exemplary embodiment of the Venturi nozzle arrangement 100 has a first area, which serves as a driving nozzle 1, and a second area, which serves as a collecting nozzle 11.
  • the second region of the nozzle arrangement 100 which serves as a catching nozzle 11, has in its interior a channel serving as a jet catching channel 12 with a longitudinal axis L. A mixture of coating powder and conveying air flows through this channel - if the Venturi nozzle arrangement 100 is used, for example, in a powder feed injector 50 for powder feed.
  • the channel which is also referred to below as the beam-catching channel 12 or powder flow channel, has a longitudinal axis L, with FIG FIG. 1 the direction of flow is indicated by an arrow.
  • the mixture of coating powder and conveying air to be conveyed enters the second region serving as a collecting nozzle 11 at a funnel-shaped nozzle inlet 13 and exits the collecting nozzle 11 again at a nozzle outlet 14.
  • the second area which serves as a catching nozzle 11, is cylindrical on the outside so that corresponding cylindrical guide surfaces 15, 15 'are formed.
  • the first area of the nozzle arrangement 100 arranged upstream of the second area (catching nozzle 11) assumes the function of a driving nozzle 1.
  • the second area (driving nozzle 1) essentially consists of a driving nozzle housing 2 with a conveying air duct 3 and a nozzle that is fluidly connected to the conveying air duct 3 4, the nozzle opening of which lies axially opposite the beam-catching channel 12.
  • the nozzle 4 or the nozzle opening is formed by a nozzle mouthpiece, which is a metal insert formed and in particular can be inseparably connected to the driving nozzle housing 2.
  • Venturi nozzle arrangement 100 shown schematically in a sectional view is distinguished in particular by the fact that the first area serving as driving nozzle 1 and the second area serving as catching nozzle 11 are combined as one component and inseparably connected to one another.
  • the first and second areas 1, 11 of the nozzle arrangement 100 can initially be formed separately, these two areas 1, 11 then being inseparably connected to one another, for example by gluing or pressing.
  • the second region 11 of the nozzle arrangement 100 which is designed to be rotationally symmetrical with respect to the longitudinal axis L of the beam-catching channel 12, can be designed as a rotary part. This in particular simplifies the manufacture and assembly of the second region 11 of the nozzle arrangement 100.
  • the nozzle arrangement 100 according to the invention is also characterized in that it is a so-called "inline" nozzle arrangement 100, which means that the coating powder to be conveyed with the nozzle arrangement 100 axially along the longitudinal axis L of the beam-catching channel 12 through the entire nozzle assembly 100 flows.
  • the first area 1 of the nozzle arrangement 100 has a powder inlet 5 which is axially opposite the nozzle outlet 14 (powder outlet) of the second area (catching nozzle 11).
  • This axial arrangement of the powder inlet 5 and powder outlet 14 can ensure that the coating powder to be conveyed cannot be deflected or at least only slightly deflected within the nozzle arrangement 100, which significantly reduces the turbulence of the coating powder-air mixture in the nozzle arrangement 100.
  • the coating powder / air mixture in the nozzle arrangement 100 experiences only a minimal flow resistance, which overall increases the conveying capacity that can be achieved with the nozzle arrangement 100 with the same amount of conveying air.
  • the first region of the nozzle arrangement 100 which serves as a propulsion nozzle 1
  • This driving nozzle housing 2 defines a conveying air duct 3 in the interior, at least in regions, which is arranged axially or at least substantially axially with respect to the longitudinal axis L of the beam-catching duct 12.
  • the nozzle opening 4 is connected in terms of flow via the conveying air channel 3 to a conveying air inlet 7, which is arranged and aligned non-axially with respect to the longitudinal axis L of the channel of the second region 11 serving as a beam catching channel 12.
  • a conveying air inlet 7 which is arranged and aligned non-axially with respect to the longitudinal axis L of the channel of the second region 11 serving as a beam catching channel 12.
  • the nozzle opening 4 of the driving nozzle 1 is arranged axially with respect to the longitudinal axis L of the beam-catching channel 12.
  • the propulsion nozzle housing 2 has a cylindrical inner contour at its downstream end area, into which the upstream end area of the second area 11 of the nozzle arrangement 100, i.e. the upstream end area of the area of the nozzle arrangement 100 serving as a catching nozzle 11, can be inserted and accordingly inseparable from the propulsion nozzle housing 2 is connectable (for example by gluing or by pressing).
  • the first and second areas 1, 11 of the nozzle arrangement 100 are thus united and inseparably connected to one another as one component.
  • These two areas 1, 11, which are inseparably connected to one another as one component, have an overall outer contour which is preferably rotationally symmetrical with respect to the longitudinal axis L of the beam-catching channel 12.
  • the nozzle arrangement 100 can be inserted as desired in a receptacle 21 of an injector housing 20 without the user having to pay attention to a specific orientation of the nozzle arrangement 100.
  • the nozzle arrangement 100 is provided with corresponding seals 8, via which the nozzle arrangement 100 can be sealed off from an injector housing 20 when the nozzle arrangement 100 is accommodated in the injector housing 20.
  • At least two circumferential sealing areas 8a, 8b are provided, a groove or annular groove 22 being formed between the two circumferential sealing areas 8a, 8b.
  • the conveying air inlet 7 of the driving nozzle 1 also opens.
  • FIG. 2 shows schematically and in a sectional view the exemplary embodiment of the nozzle arrangement 100 according to the invention according to FIG. 1 in a state in which the nozzle arrangement 100 is received at least in some areas in a housing, in particular injector housing 20.
  • the housing or injector housing 20 has a receptacle 21, the size of which is adapted to the outer diameter and outer configuration of at least the upstream end region of the first region (propellant nozzle 1) of the nozzle arrangement 100.
  • the sealing rings 8a, 8b of the nozzle arrangement 100 seal at least the upstream end region of the nozzle arrangement 100 from the wall of the receptacle 21 provided in the injector housing 20.
  • FIG. 2 It can also be seen that the groove or annular groove 22 formed between the two circumferential sealing areas 8a, 8b of the nozzle arrangement 100 forms an annular space with the wall of the receptacle 21 of the injector housing 20, this annular space being connected in terms of flow via a conveying air connection 23 formed in the injector housing 20 .
  • FIG. 2 The schematic sectional view in FIG. 2 it can also be seen that a powder line connection 24 is plugged onto the downstream end region of the second region of the nozzle arrangement 100 (catching nozzle 11) and, in particular, is detachably connected to the downstream end region.
  • the powder line connection 24 has a receiving channel which is arranged axially with respect to the longitudinal axis L of the jet catching channel 12 and in which the downstream end region of the catching nozzle 11 can be received at least in some areas. Furthermore - as in FIG. 2 indicated schematically - the powder line connection 24 have a corresponding seal 25 in order to seal in particular the powder line connection 24 with respect to the injector housing 20.
  • the powder line connection 24 can be plugged onto the downstream end area of the collecting nozzle 11 in such a way that an annular space 26 is formed which is delimited by the injector housing 20, the powder line connection 24 and the nozzle arrangement 100 and which is in flow connection with a metering air channel 27 formed in the injector housing 20. Via this metering air channel 27, metering air can be supplied to the annular space 26, which can be added to the coating powder-air mixture conveyed by the nozzle arrangement 100.
  • the exemplary embodiment of the powder feed injector 50 has a nozzle arrangement 100 and an injector housing 20.
  • the nozzle arrangement 100 is, in particular, a nozzle arrangement 100 as described above with reference to the illustrations in FIG FIG. 1 and 2 has been described.
  • the nozzle arrangement 100 As in the in FIG. 3 , 4th and 5a-e
  • a nozzle arrangement 100 consisting of a driving nozzle 1 and a catching nozzle 11, the catching nozzle 11 having a jet catching channel 12 which is axially opposite the driving nozzle 1 at a distance.
  • the collecting nozzle 11 and the driving nozzle 1 are combined and inseparably connected to one another as one component.
  • the nozzle arrangement 100 used in the exemplary embodiment of the powder feed injector 50 according to the invention is characterized in that the driving nozzle 1 of the nozzle arrangement 100 has a powder inlet 5 which is axially opposite the jet catching channel 12 at a distance.
  • the nozzle arrangement 100 and in particular the driving nozzle 1 of the nozzle arrangement 100 are accommodated at least in some areas, preferably in a removable or replaceable manner.
  • the nozzle arrangement 100 is preferably designed to be rotationally symmetrical with respect to the longitudinal axis L of the beam-catching channel 12. With regard to rotation, therefore, the nozzle arrangement 100 can be received at least in regions in the injector housing 20, regardless of its orientation, which simplifies the exchangeability of the nozzle arrangement 100.
  • the nozzle arrangement 100 has two circumferential ring seals 8a, 8b, at least in the area of the propellant nozzle 1, between which a groove or channel 22 is formed.
  • This groove or channel 22 defines the nozzle arrangement in the inserted state 100 an annular space which is fluidly connected to a conveying air duct 3 formed in the injector housing 20 and in particular non-axially aligned, so that conveying air can always be supplied to the propelling air duct 3 of the nozzle arrangement 100 regardless of the rotational alignment of the nozzle arrangement 100.
  • the exemplary embodiment of the powder feed injector 50 according to the invention furthermore has a powder line connection 24 which is used to connect a powder line, in particular a powder hose, to the downstream end region of the collecting nozzle 11 of the nozzle arrangement 100.
  • a powder line connection 24 is detachably connected to the downstream end region of the collecting nozzle 11 of the nozzle arrangement 100.
  • the powder line connection 24 can be designed as a hose nozzle, which can be slipped over the downstream end region of the collecting nozzle 11.
  • the powder line connection 24 which is designed, for example, as a hose nozzle, is fastened to the injector housing 20 by means of a union nut when it is slipped over the downstream end region of the collecting nozzle 11.
  • a locking device 60 is used, with which the powder line connection 24 can be detachably connected to the injector housing 20.
  • the powder line connection 24, in particular designed as a hose nozzle, is detachably connected to the downstream end area of the collecting nozzle 11 in such a way that an annular space 26 is formed which is defined by the nozzle arrangement 100, the injector housing 20 and the powder line connection 24 when the nozzle arrangement 100 is together with the powder line connection 24 is at least partially received in the injector housing 20 (cf. the schematic sectional view according to FIG FIG. 3 ).
  • This annular space 26 is fluidly connected to a metering air channel 27 formed in the injector housing 20, via which metering air can be supplied to the annular space 26 if necessary.
  • the upstream end area of the powder line connection 24, in particular designed as a hose nozzle, preferably has helically designed ribs 28 which, in a state when the nozzle arrangement 100 together with the powder line connection 24 is received at least in some areas in the injector housing 20, define corresponding metering air channels that flow with the annular space 26 or the metering air channel 27 formed in the injector housing 20.
  • the metering air fed into the metering air channel 27 of the injector housing 20 can then be mixed into the mixture of conveying air and coating powder via these metering air channels.
  • the ribs 28 provided in particular on the upstream end region of the powder line connection 24, which is preferably designed as a hose nozzle, are designed in a helical manner in order to give the metering air to be fed to the conveying air-coating powder mixture a certain twist.
  • the ribs 28 also have the advantage that they increase the grip of the powder line connection 24.
  • the nozzle arrangement 100 together with the powder line connection 24 can easily be pulled out of the injector housing 20 or the receptacle 21 provided in the injector housing 20 for the nozzle arrangement 100.
  • the powder line connection 24, in particular designed as a hose nozzle, can consist of an electrically non-conductive material and be surrounded on the outside by a layer or a sleeve made of electrically conductive material.
  • the sleeve surrounding the powder line connection 24, which is designed in particular as a hose nozzle, can for example consist of metal or an electrically conductive plastic. It would be conceivable, for example, to use a hose nozzle as the powder line connection 24, as described in the publication DE 202 04 116 U1 is described.
  • the exemplary embodiment of the powder feed injector 50 has a structure which, in principle, corresponds to the structure of the above with reference to the illustrations in FIG FIG. 3 to 5 described powder feed injector 50 corresponds.
  • the powder feed injector 50 has an injector housing 20 with a receptacle 21 in which a nozzle arrangement 100 embodied as a component is exchangeably received.
  • the in the powder feed injector 50 according to the in FIG. 6th The nozzle arrangement 100 used in the illustrated embodiment preferably corresponds to the nozzle arrangement 100 as described above with reference to the illustrations in FIG FIG. 1 and 2 has been described. To avoid repetition, reference is therefore made to the previous statements.
  • the powder feed injector 50 has a powder feed channel 29 which is in flow connection with a powder container ("hopper"), the powder feed channel 29 preferably running at least substantially axially to the conveying axis (cf. FIG. 3 ). As in FIG. 6 and 7 indicated, but it is also conceivable if the powder feed channel 29 of the powder feed injector 50 is slightly angled with respect to the feed axis.
  • the powder feed injector 50 also has a feed air connection 24, which can be connected to a feed air hose or a similar line via a corresponding filter device 30.
  • a metering air connection 27 'of the powder feed injector 50 can also be connected to a metering air hose or a similar line via a corresponding filter device 30.
  • FIG. 7th Another exemplary embodiment of the powder feed injector 50 according to the invention shown schematically corresponds essentially to the embodiment according to FIG. 6th , wherein in the embodiment according to FIG. 7th however, no filter devices 30 are provided.
  • the coating powder conveyed by the powder conveying injector 50 according to the present invention can be conveyed by the powder conveying injector 50 to a further container or to a spray device, for example a manual or automatic spray gun, with which the coating powder is sprayed onto objects to be coated.
  • a spray device for example a manual or automatic spray gun
  • the strength of the powder volume flow (conveyed amount of powder per unit of time) is mainly dependent on the strength of the negative pressure or vacuum in the negative pressure area at the upstream end of the propellant nozzle 1 and thus primarily on the strength of the conveying air flow.
  • the conveying air flow can become so weak that powder deposits form in the powder line which connects the powder conveying injector 50 to the powder receiver. It is therefore customary to supply additional air in the form of metering air to the coating powder conveying air stream after the negative pressure area in order to set the total amount of air required for deposit-free powder conveyance in the powder line.
  • one or more metering air connections 27 ′ for the metering air can be provided downstream of the collecting nozzle 11 or in the collecting nozzle 11 or upstream of the collecting nozzle 11.
  • the powder feed channel 29 is formed axially with respect to the longitudinal axis L of the beam-catching channel 12. Rather, the powder feed channel 29 runs here at an obtuse angle of approximately 45 °. However, this preferably does not apply to the powder inlet 5 of the nozzle arrangement 100, which is preferably designed axially with respect to the longitudinal axis L of the beam-catching channel 12.
  • the coating powder conveyed by the powder conveying injector 50 is used in particular for the electrostatic spray coating of objects and can for example made of plastic, ceramic or another coating material.
  • the invention is not limited to systems for the electrostatic spray coating of objects with coating powder, but can also be used for conveying powder for other purposes.

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  • Electrostatic Spraying Apparatus (AREA)

Claims (15)

  1. Injecteur de fourniture de poudre (50) pour fournir de la poudre de revêtement, comprenant une buse de propulsion (1) et une buse de capture (11), la buse de capture (11) ayant un canal de capture de jet (12) qui se trouve à distance axialement à l'opposé de la buse de propulsion (1), comprenant en outre un boîtier d'injecteur (20) dans lequel au moins la buse de propulsion (1) est logée au moins localement de préférence de façon amovible ou remplaçable, et la buse de capture (11) et la buse de propulsion (1) sont réunies en tant que composant unique de telle sorte que lors d'un remplacement de la buse de propulsion (1), la buse de propulsion (1) ne peut être remplacée que simultanément avec la buse de capture (11).
  2. Injecteur de fourniture de poudre (50) selon la revendication 1,
    dans lequel la buse de propulsion (1) présente une entrée de poudre (5) qui se trouve à distance axialement à l'opposé du canal de capture de jet (12) et est orientée par rapport à un axe qui coïncide avec ou est parallèle à un axe longitudinal défini par le canal de capture de jet (12) ; ou
    la buse de propulsion (1) présente une entrée de poudre (5) qui est orientée par rapport à un axe qui recoupe un axe longitudinal défini par le canal de capture de jet (12), de préférence selon un angle de 90° ou selon un angle obtus.
  3. Injecteur de fourniture de poudre (50) pour fournir de la poudre de revêtement, comprenant une buse de propulsion (1) et une buse de capture (11), la buse de capture (11) ayant un canal de capture de jet (12) qui se trouve à distance axialement à l'opposé de la buse de propulsion (1),
    caractérisé en ce que
    la buse de propulsion (1) présente une entrée de poudre (5) qui se trouve à distance axialement à l'opposé du canal de capture de jet (12).
  4. Injecteur de fourniture de poudre (50) selon la revendication 3,
    dans lequel la buse de capture (11) et la buse de propulsion (1) sont reliées l'une à l'autre de manière inséparable en étant réunies en un composant unique.
  5. Injecteur de fourniture de poudre (50) selon l'une des revendications 1 à 4,
    dans lequel les buses de capture et de propulsion sont reliées l'une à l'autre de préférence de manière inséparable en étant réunies en un composant unique et présentent en particulier au moins un joint d'étanchéité (8 ; 8a, 8b) pour rendre étanche ledit composant par rapport au boîtier d'injecteur (20).
  6. Injecteur de fourniture de poudre (50) selon l'une des revendications 1 à 5,
    dans lequel est prévu un boîtier d'injecteur (20) dans lequel au moins la buse de propulsion (1) est logée au moins localement, et
    le boîtier d'injecteur (20) présente un canal d'alimentation en poudre (29) qui peut être relié à une conduite à poudre et qui est relié en termes d'écoulement à l'entrée de poudre (5) de la buse de propulsion (1), de préférence, un joint d'étanchéité axial (31) étant prévu dans le canal d'alimentation en poudre (29), en particulier dans une zone d'extrémité amont du canal d'alimentation en poudre (29).
  7. Injecteur de fourniture de poudre (50) selon l'une des revendications 1 à 6,
    dans lequel est prévu un boîtier d'injecteur (20) dans lequel sont logées au moins localement les buses de capture et de propulsion réunies de préférence en un composant unique, un logement (21) étant formé dans le boîtier d'injecteur (20) dans lequel est logée au moins une zone amont des buses de capture et de propulsion réunies de préférence en un composant unique, le logement (21) étant de forme cylindrique circulaire et étant formé axialement par rapport à l'axe longitudinal (L) de la buse de capture (11), de préférence, au moins un raccord d'air de fourniture (23) étant prévu dans le boîtier d'injecteur (20), qui est relié en termes d'écoulement à un canal à air de fourniture (3) via un espace annulaire formé entre le logement (21) du boîtier d'injecteur (20) et les buses de capture et de propulsion réunies en un composant unique, et
    en particulier, la buse de propulsion (1) présente une entrée d'air de fourniture (7) qui est reliée en termes d'écoulement au canal à air de fourniture (3) et qui est disposée et orientée de manière non axiale par rapport à l'axe longitudinal (L) de la buse de capture (11).
  8. Injecteur de fourniture de poudre (50) selon l'une des revendications 1 à 7,
    dans lequel les buses de capture et de propulsion, de préférence réunies en un composant unique, sont à symétrie de révolution par rapport à l'axe longitudinal (L) de la buse de capture (11).
  9. Injecteur de fourniture de poudre (50) selon l'une des revendications 1 à 8,
    dans lequel est en outre prévu un raccord de conduite à poudre (24) pour raccorder une conduite à poudre, en particulier un tuyau flexible à poudre, à une zone d'extrémité aval de la buse de capture (11), le raccord de conduite à poudre (24) étant en particulier relié de manière détachable à la zone d'extrémité aval de la buse de capture (11).
  10. Injecteur de fourniture de poudre (50) selon la revendication 8 ou 9,
    dans lequel est prévu un boîtier d'injecteur (20) dans lequel sont logées au moins localement les buses de capture et de propulsion réunies de préférence en un composant unique, et une zone d'extrémité amont du raccord de conduite à poudre (24) est logée au moins localement dans le boîtier d'injecteur (20) et est reliée de manière détachable au boîtier d'injecteur (20) via un dispositif de verrouillage (60).
  11. Injecteur de fourniture de poudre (50) selon l'une des revendications 1 à 10,
    dans lequel la buse de capture (11) est réalisée en un premier matériau et la buse de propulsion (1) est réalisée en un second matériau, le premier matériau étant différent du second matériau ou étant identique au second matériau ; et/ou
    le canal de capture de jet (12) est réalisé à symétrie de révolution par rapport à l'axe longitudinal (L) de la buse de capture (11),
    la buse de capture (11) est réalisée de préférence à symétrie de révolution par rapport à l'axe longitudinal (L) ; et/ou
    la buse de propulsion (1) présente un boîtier de buse de propulsion (2) ayant un canal à air de fourniture (3) et une embouchure de buse qui est reliée en termes d'écoulement au canal à air de fourniture (3) et qui est située axialement à l'opposé du canal de capture de jet (12),
    l'embouchure de buse étant réalisée de préférence sous forme d'insert et étant reliée de manière inséparable au boîtier de buse de propulsion (2).
  12. Ensemble de buse venturi (100) pour injecteurs de fourniture de poudre (50), dans lequel l'ensemble de buse (100) comprend une première zone servant de buse de propulsion (1) et une seconde zone servant de buse de capture (11), ladite seconde zone comprend un canal servant de canal de capture de jet (12) ayant un axe longitudinal (L), et ladite première zone présente un orifice de buse (4) axialement opposé audit canal de capture de jet (12), lesdites première et seconde zones de l'ensemble de buse (100) étant reliées l'une à l'autre en étant réunies de manière inséparable en un composant unique.
  13. Ensemble de buse venturi (100) selon la revendication 12,
    dans lequel la première zone servant de buse de propulsion (1) présente une entrée de poudre (5) qui se trouve à distance axialement à l'opposé du canal de la seconde zone servant de canal de capture de jet (12).
  14. Ensemble de buse venturi (100) selon la revendication 12 ou 13,
    dans lequel l'ensemble de buse (100) peut être logé dans un boîtier d'injecteur (20), de préférence de manière amovible ou remplaçable, de telle sorte qu'au moins la première zone de l'ensemble de buse (100) est logée au moins localement dans le boîtier d'injecteur (20),
    l'ensemble de buse (100) comprend de préférence au moins un joint d'étanchéité (8 ; 8a, 8b) pour rendre étanche l'ensemble de buse (100) par rapport au boîtier d'injecteur (20).
  15. Ensemble de buse venturi (100) selon l'une des revendications 12 à 14,
    dans lequel la première zone servant de buse de propulsion (1) comprend une entrée d'air de fourniture (7) disposée et orientée de manière non axiale par rapport à l'axe longitudinal (L) du canal de la seconde zone servant de canal de capture de jet (12) ; et/ou
    l'ensemble de buse (100) est réalisé à symétrie de révolution par rapport à l'axe longitudinal (L) du canal servant de canal de capture de jet (12).
EP17801703.4A 2017-02-17 2017-11-20 Injecteur a poudre avec buse a venturi Active EP3582904B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017103316.5A DE102017103316A1 (de) 2017-02-17 2017-02-17 Pulverförderinjektor zum fördern von beschichtungspulver und venturi-düsenanordnung
PCT/EP2017/079815 WO2018149524A1 (fr) 2017-02-17 2017-11-20 Injecteur de fourniture de poudre à tube de venturi

Publications (2)

Publication Number Publication Date
EP3582904A1 EP3582904A1 (fr) 2019-12-25
EP3582904B1 true EP3582904B1 (fr) 2021-09-29

Family

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Application Number Title Priority Date Filing Date
EP17801703.4A Active EP3582904B1 (fr) 2017-02-17 2017-11-20 Injecteur a poudre avec buse a venturi

Country Status (5)

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US (1) US11446683B2 (fr)
EP (1) EP3582904B1 (fr)
CN (1) CN110352097A (fr)
DE (1) DE102017103316A1 (fr)
WO (1) WO2018149524A1 (fr)

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DE102018133713A1 (de) * 2018-12-31 2020-07-02 Gema Switzerland Gmbh Pulverdünnstrompumpe sowie Verfahren zum Betreiben einer Pulverdünnstrompumpe
CN112474094B (zh) * 2020-11-23 2022-07-15 中国科学技术大学 一种超音速气流与旋流负压耦合的远程喷射方法及装置
EP4141390B1 (fr) 2021-08-31 2024-03-20 Wagner International AG Dispositif de mesure permettant de mesurer un débit massique de poudre de revêtement pouvant être généré à l'aide du gaz comprimé dans une conduite de poudre et dispositif de transport pour le poudre de revêtement

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Also Published As

Publication number Publication date
WO2018149524A1 (fr) 2018-08-23
US20200047200A1 (en) 2020-02-13
US11446683B2 (en) 2022-09-20
DE102017103316A1 (de) 2018-08-23
EP3582904A1 (fr) 2019-12-25
CN110352097A (zh) 2019-10-18

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