EP3582904A1 - Injecteur de fourniture de poudre à tube de venturi - Google Patents

Injecteur de fourniture de poudre à tube de venturi

Info

Publication number
EP3582904A1
EP3582904A1 EP17801703.4A EP17801703A EP3582904A1 EP 3582904 A1 EP3582904 A1 EP 3582904A1 EP 17801703 A EP17801703 A EP 17801703A EP 3582904 A1 EP3582904 A1 EP 3582904A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
powder
catching
channel
injector
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.)
Granted
Application number
EP17801703.4A
Other languages
German (de)
English (en)
Other versions
EP3582904B1 (fr
Inventor
Marco Sanwald
Roger TOBLER
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.)
Gema Switzerland GmbH
Original Assignee
Gema Switzerland GmbH
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 Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Publication of EP3582904A1 publication Critical patent/EP3582904A1/fr
Application granted granted Critical
Publication of EP3582904B1 publication Critical patent/EP3582904B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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 Pulverohninjektor with a Venturi nozzle assembly and a Venturi nozzle assembly for Pulverohninjektoren.
  • the invention relates to Pulver strictlyinjektoren for conveying coating powder with a motive nozzle and a catching nozzle, wherein the catching nozzle has a jet-catching channel, which axially opposite the motive nozzle at a distance.
  • This arrangement of the blowing and trapping nozzles is also referred to herein as the "venturi nozzle arrangement.”
  • Nozzle arrangements of this type are used in powder delivery injectors which, by utilizing the so-called venturi effect, convey fluidized coating powder from a powder reservoir, in particular by means of conveying air, and through the trapping nozzle
  • the catching nozzle which generally takes the form of an oblong hollow body, forms in its interior a so-called beam-catching channel, into which the powder-air mixture to be conveyed is introduced.
  • the jet-trapping channel of the trapping nozzle faces a propulsion jet or delivery jet nozzle, through which propulsion or conveying air is forced into the trapping nozzle he propulsion or winningstrahldüse forms an air flow high speed, which forms a negative pressure in an immediately adjacent Pulverzu 1500kanal which communicates with 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 catching nozzle and fed therethrough to the powder feed hose.
  • Pulver bulkinjektoren known from the prior art have the disadvantage that the air flow and the powder particles wear the blowing nozzle and the catching nozzle and in particular the jet-catching channel of the catching nozzle. Due to the abrasive effect of the coating powder, which is passed through the catching nozzle at high speed, in particular the jet-catching channel of the catching nozzle undergoes relatively high wear, which is generally noticeable in that the material removal leads to an expansion of the jet-catching channel, which results in a pressure drop entails.
  • Pulveraciinjektoren it is known, for example from DE 198 24 802 AI, to form the jet-catching channel of the catching nozzle from a relatively hard material, in particular glass.
  • the motive nozzle when the motive nozzle is formed of a plastic material, there is a risk that due to the compressed air pressed through the motive nozzle, the nozzle opening of the motive nozzle expands over time.
  • the nozzle hole of the blowing nozzle is formed of metal which is "harder” and therefore less subject to wear compared to plastic, accumulation and sintering of powder particles at the nozzle tip can not be prevented since metal has the disadvantage that that the powder particles tend to adhere and to sinter.
  • the problem to be solved is to provide a way that is ensured in a routine or defective replacement of the catching nozzle that then the Pulverrentinjektor guaranteed a special efficient and optimized promotion of coating powder.
  • the catching nozzle and the motive nozzle are unseparably connected together as one component.
  • the term “combined as one component” or “inseparably connected to one another” is to be understood as meaning a connection of the two components “catching nozzle” and “motive nozzle”, which can no longer be released without destruction.
  • the catching nozzle and the motive nozzle of the powder conveying injector are inseparably connected to one another as a component, it being particularly easy for the user of the powder conveying injector to replace the motive nozzle during a routine or defect-related replacement of the catching nozzle, so that subsequently the powder conveying injector or the consecu- the matched flow cross sections in the nozzle assembly correspond to the originally selected factory designs.
  • the drive nozzle - if at all - was interchangeable only with relatively high effort, which was thus not usually done in practice.
  • the solution according to the invention moreover makes it possible to carry out the powder delivery injector as so-called “in-line injector” in which the coating powder to be conveyed with the powder delivery injector with respect to the longitudinal axis of the jet-catching channel is fed axially to the Pulver indispensableinjektor.
  • the invention thus also relates to a powder conveying injector for conveying coating powder, which has a driving nozzle and a catching nozzle, wherein the A catching nozzle has a jet-catching channel, which lies axially opposite the blowing nozzle at a distance, and wherein the blowing nozzle has a powder inlet which is axially opposite the jet-catching channel at a distance.
  • the invention also relates to a Venturi nozzle arrangement for powder feed injectors, the nozzle arrangement having a first area serving as a motive nozzle and having a second area serving as a catching nozzle, the second area serving as a jet channel having a longitudinal axis, and wherein the first region has a nozzle opening, which axially the jet-catching channel opposite, wherein the first and second region of the nozzle assembly as a component combined inseparably connected or connectable.
  • the present invention relates to a powder delivery injector for conveying coating powder, wherein the powder delivery injector has a drive nozzle and a catching nozzle, and wherein the catching nozzle has a jet-catching channel which is axially opposed to the drive nozzle at a distance.
  • the collecting nozzle and the motive nozzle to be inseparably connected to one another as a component.
  • the motive nozzle has a powder inlet which lies axially opposite the jet-catching channel at a distance.
  • the motive nozzle has a powder inlet which is axially opposed to the beam trapping channel and aligned with respect to an axis coinciding with a longitudinal axis defined by the beam trapping channel or parallel to a longitudinal axis defined by the jet trapping channel.
  • the motive nozzle has a powder inlet which is aligned with respect to an axis which 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 delivery injector for delivering coating powder, the powder delivery injector having a motive nozzle and a capture nozzle, and wherein the capture nozzle has a jet capture channel spaced axially from the motive nozzle.
  • the drive nozzle provision is made in particular for the drive nozzle to have a powder inlet which lies axially opposite the jet-catching channel at a distance.
  • the catching nozzle and the motive nozzle are inseparably connected to one another as a component.
  • an injector housing may be provided, in which at least the motive nozzle is at least partially removably or removably received.
  • the collecting and driving nozzles which are inseparably connected to one another as a component, preferably have at least one seal for sealing the component with respect to the injector housing.
  • an injector housing may be provided, in which at least the motive nozzle is at least partially accommodated, wherein the injector housing has a powder inlet region connectable to a powder line, in which an axial powder inlet channel is formed with respect to the longitudinal axis of the capture nozzle and in fluid communication with the powder inlet of the motive 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 catching and driving nozzle, which is preferably combined as a component, is accommodated at least in regions, wherein a receptacle is formed in the injector housing in which at least one upstream region preferably combines as one component Catch and drive nozzle is received, wherein the recording is circular cylindrical and executed axially with respect to the longitudinal axis of the catching nozzle.
  • a delivery air connection may be provided in the injector housing, which is connected in terms of flow with the conveying air channel via an annular space formed between the receptacle of the injector housing and the catching and driving nozzle combined as a component.
  • the motive nozzle may have a conveying air inlet which is fluidly connected to the conveying air channel and which is arranged and aligned non-axially with respect to the longitudinal axis of the collecting nozzle.
  • the catching and driving nozzle which is preferably combined as one component, can be rotationally symmetrical with respect to the longitudinal axis of the catching nozzle.
  • a powder line connection can be provided for connecting a powder line, in particular a powder hose, to a downstream end region of the catching nozzle, wherein the powder line connection is in particular detachably connected to the downstream end region of the catching nozzle.
  • an injector housing can be provided in which, at least in some areas, the injector housing is preferably provided as a housing
  • Component unified collecting and driving nozzle is received, wherein an upstream end region of the powder inlet connection is at least partially received in the injector and is connected via a locking device releasably connected to the injector.
  • the catching nozzle may be formed of a first material and the driving nozzle of a second material, wherein the first material is 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 catching nozzle may be rotationally symmetrical with respect to the longitudinal axis.
  • the motive nozzle can have a motive nozzle housing with a conveying air channel and a nozzle mouth fluidically connected to the conveying air channel, which lies axially opposite the jet catching channel.
  • the nozzle orifice may be formed as an insert and inseparably connected to the motive nozzle housing.
  • the present invention relates to a Venturi nozzle arrangement for powder feed injectors, wherein the nozzle arrangement has a first region serving as a motive nozzle and having a second region serving as a catching nozzle, the second region having a channel serving as a jet trapping channel Has longitudinal axis, and wherein the first region has a nozzle opening which is axially opposite the jet-catching channel, wherein the first and second region of the nozzle assembly are combined in one piece inseparably connected as a component.
  • the first region serving as a motive nozzle may have a powder inlet, which serves as a jet channel of the second region with Able stood axially opposite.
  • the nozzle arrangement may preferably be removable or exchangeable in an injector housing in such a way that at least the first area of the nozzle arrangement is at least partially accommodated in the injector housing.
  • the nozzle assembly may include at least one seal for sealing the nozzle assembly relative to the injector housing.
  • the first area serving as a driving nozzle may 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 jet channel.
  • the nozzle arrangement can be designed rotationally symmetrically with respect to the longitudinal axis of the channel serving as the beam-catching channel.
  • FIG. 1 schematically in a sectional view an
  • Venturi nozzle assembly according to the invention
  • FIG. 2 shows schematically in a sectional view the exemplary embodiment of the venturi nozzle arrangement according to the invention in a state accommodated in an injector housing;
  • FIG. 3 is a schematic sectional view of an exemplary embodiment of the powder delivery injector according to the invention.
  • FIG. 4 shows schematically and in an isometric view the exemplary embodiment of the powder injector according to the invention according to FIG. 3;
  • FIG. 5a to e show schematically different views of the exemplary embodiment of the powder injector according to the invention according to FIG. 4;
  • FIG. 6 shows schematically and in an isometric view another exemplary embodiment of the powder injector according to the invention;
  • FIG. 7 shows schematically and in an isometric view a further exemplary embodiment of the powder injector according to the invention.
  • a jet pump with a Pulver malfunctioninjektor which operates on the injector principle or Venturi tube principle.
  • a Pulver malfunctioninjektor produces an air jet in a vacuum region formed by channel broadening, a negative pressure, which is used to aspirate coating powder from the container or container.
  • the suctioned coating powder is entrained by the air jet and conveyed to the spray device. By adjusting the flow rate of the air flow, the negative pressure and thus the conveyed powder quantity can be adjusted.
  • the invention is based on the problem, according to which Pulverierinjektoren of the known type have the disadvantage that the air flow and the powder particles wear the blowing nozzle and the beam collecting duct. This not only has the disadvantage that, depending on the degree of wear, the powder volume flow (powder quantity delivered per unit time) also changes, which results in unequal coating thicknesses and coating qualities on an article to be coated.
  • the exemplary embodiment of the Venturi nozzle assembly 100 has a first region which serves as a motive nozzle 1 and a second region which serves as a capture 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 beam-catching channel 12 with a longitudinal axis L.
  • the channel which is also referred to below as a jet-trapping channel 12 or powder flow channel, has a longitudinal axis L, wherein in FIG. 1 the flow direction is indicated by an arrow.
  • the mixture of coating powder and conveying air to be conveyed enters the funnel-shaped nozzle inlet 13 into the second region serving as catching nozzle 11 and out of the catching nozzle 11 at a nozzle outlet 14 again.
  • the second area which serves as catching nozzle 11 has a cylindrical shape 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) performs the function of a motive nozzle 1.
  • the second area (motive nozzle 1) consists essentially of a motive nozzle housing 2 with a conveying air channel 3 and a nozzle fluidly connected to the conveying air channel 3 4, whose nozzle opening is located axially opposite the jet-catching channel 12.
  • the nozzle 4 or the nozzle opening is formed by a nozzle orifice, which is used as a metal nozzle. Insert formed and in particular may be inseparably connected to the drive nozzle housing 2.
  • Venturi nozzle arrangement 100 shown schematically in a sectional view is characterized in particular by the fact that the first area serving as a driving nozzle 1 and the second area serving as a catching nozzle 11 are united as one component and inseparably connected to each other.
  • first and second regions 1 are basically conceivable to use the first and second regions 1,
  • the first and second region 1, 11 of the nozzle assembly 100 may initially be formed separately, in which case these two areas 1, 11 are inseparably connected to each other, for example by gluing or pressing.
  • Another advantage of this embodiment is that the second region 11 of the nozzle assembly 100, which with respect to the longitudinal axis L of the beam-catching channel
  • the nozzle arrangement 100 according to the invention as shown schematically in FIG. 1 is shown in a sectional view, moreover characterized by the fact that this is a so-called "inline" nozzle assembly 100, which means that the coating powder to be conveyed with the nozzle assembly 100 axially along the longitudinal axis L of the beam-catching channel 12 by the entire nozzle assembly 100 flows.
  • the first area 1 of the nozzle arrangement 100 has a powder inlet 5, which lies axially opposite the nozzle outlet 14 (powder outlet) of the second area (catching nozzle 11).
  • the coating powder to be conveyed is not 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 retains only a minimal flow resistance, which overall increases the achievable with the nozzle assembly 100 capacity at the same amount of conveying air.
  • the first region of the nozzle assembly 100 which serves as a motive nozzle 1, constructed substantially cylindrical and has a drive nozzle housing 2 with a substantially cylindrical outer surface.
  • This motive nozzle housing 2 defines in the interior, at least in regions, a conveying air channel 3, which is arranged axially or at least substantially axially with respect to the longitudinal axis L of the beam-catching channel 12.
  • a nozzle projection 6, in which the nozzle opening 4 of the motive nozzle 1 is formed extends.
  • the nozzle opening 4 is connected via the conveying air duct 3 in terms of flow with a conveying air inlet 7, which is non-axially arranged and aligned with respect to the longitudinal axis L of the channel of the second area 11 serving as jet channel 12.
  • a conveying air inlet 7 which is non-axially arranged and aligned with respect to the longitudinal axis L of the channel of the second area 11 serving as jet channel 12.
  • the nozzle opening 4 of the motive nozzle 1 is arranged axially with respect to the longitudinal axis L of the jet-trapping channel 12.
  • conveying air is supplied via the conveying air inlet 7 to the motive nozzle 1 which flows out via the nozzle opening 4 of the motive nozzle 1 in the direction of the jet-trapping channel 12. Due to the nozzle-shaped arrangement of at least the upstream portion of the jet-catching channel 12, the conveying air is pressed into the catching nozzle 11 and due to the relatively small diameter of the nozzle opening 4 of the motive nozzle 1 forms a high-velocity air flow, whereby in the region of the powder inlet 5 of the nozzle assembly 100 a Vacuum is formed.
  • Coating powder is sucked through this negative pressure that forms in the powder inlet region during operation of the nozzle arrangement 100 when the powder inlet 5 of the first region 1 of the nozzle arrangement 100 serving as a nozzle 1 is connected via a nozzle Powder line etc. in terms of flow with a corresponding powder container or the like in connection.
  • the drive nozzle housing 2 at its downstream end portion on a cylindrical inner contour, in which the upstream end portion of the second portion 11 of the nozzle assembly 100, d. H. the upstream end region of the region of the nozzle arrangement 100 serving as the catching nozzle 11 can be inserted and correspondingly non-detachably connected to the blowing nozzle housing 2 (for example by gluing or by pressing).
  • the first and second region 1, 11 of the nozzle assembly 100 are combined in one piece as a component inseparable.
  • These two regions 1, 11, which are inseparably joined together 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 assembly 100 can be used arbitrarily in a receptacle 21 of an injector 20, without the user has to pay attention to a specific orientation of the nozzle assembly 100.
  • the nozzle arrangement 100 is provided with corresponding seals 8, via which the nozzle arrangement 100 can be sealed off with respect to an injector housing 20, when the nozzle arrangement 100 is accommodated in the injector housing 20.
  • At least two peripheral sealing regions 8a, 8b are provided, wherein between the two circumferential sealing regions 8a, 8b, a groove or annular groove 22 is formed.
  • a groove or annular groove 22 is formed between the two circumferential sealing regions 8a, 8b, also opens the conveyor air inlet 7 of the motive nozzle.
  • 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 at least partially accommodated in a housing, in particular injector housing 20.
  • the housing or injector housing 20 has a receptacle 21 whose size is adapted to the outer diameter and outer configuration of at least the upstream end region of the first region (motive nozzle 1) of the nozzle arrangement 100.
  • the sealing rings 8a, 8b of the nozzle arrangement 100 at least the upstream end region of the nozzle arrangement 100 is sealed against the wall of the receptacle 21 provided in the injector housing 20.
  • FIG. 2 also shows that the groove or annular groove 22 formed between the two peripheral sealing regions 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 fluidly connected via a conveying air connection 23 formed in the injector housing 20 is.
  • FIG. 2 The schematic sectional view in FIG. 2 that a powder outlet connection 24 is plugged onto the downstream end region of the second region of the nozzle arrangement 100 (catching nozzle 11) and in particular detachably connected to the downstream end region.
  • the powder outlet connection 24 has a receiving channel arranged axially with respect to the longitudinal axis L of the jet-catching channel 12, in which region the downstream end region of the catching nozzle 11 can be received at least in regions. Furthermore, as shown in FIG. 2 schematically indicated - the powder line connection 24 have a corresponding seal 25, in particular to seal the powder outlet connection 24 with respect to the injector housing 20.
  • the powder outlet connection 24 can be plugged onto the downstream end region of the catching nozzle 11 in such a way that an annular space 26 bounded by the injector housing 20, the powder line connection 24 and the nozzle arrangement 100 is formed, which is in fluid communication with a metering air channel 27 formed in the injector housing 20 , Dosing air 26 can be supplied to the annular space 26 via this metering air channel 27, which metering air can be added to the coating powder / air mixture conveyed with the nozzle arrangement 100.
  • a metering air channel 27 formed in the injector housing 20
  • the exemplary embodiment of the powder delivery injector 50 has a nozzle arrangement 100 and an injector housing 20.
  • the nozzle arrangement 100 is a nozzle arrangement 100, as described above with reference to the illustrations in FIG. 1 and 2 has been described.
  • the nozzle assembly 100 as shown in FIG. 3, 4 and 5a-e shown schematically Pulver complicatinjektor 50 is thus a nozzle assembly 100 consisting of a motive nozzle 1 and a catching nozzle 11, wherein the catching nozzle 11 has a jet trapping channel 12 which the drive nozzle 1 at a distance axially opposite.
  • the catching nozzle 11 and the motive nozzle 1 are unseparably joined together as a component.
  • the nozzle assembly 100 used in the exemplary embodiment of the powder delivery injector 50 according to the invention is characterized in that the motive nozzle 1 of the nozzle arrangement 100 has a powder inlet 5 which lies axially opposite the jet capture channel 12 at a distance.
  • the nozzle arrangement 100 and in particular the motive nozzle 1 of the nozzle arrangement 100 are preferably removed or exchanged at least in regions.
  • the nozzle arrangement 100 is preferably designed rotationally symmetrically with respect to the longitudinal axis L of the beam-catching channel 12. Therefore, the nozzle arrangement 100 can be accommodated in the injector housing 20 at least in regions, irrespective of their orientation, with regard to rotation, which simplifies the interchangeability of the nozzle arrangement 100.
  • the nozzle arrangement 100 has at least in the region of the motive nozzle 1 two circumferential annular seals 8a, 8b, between which a groove 22 is formed.
  • This groove or channel 22 defined in the inserted state of the Düsenano- 100 an annular space which is fluidly connected to a formed in the Injektorgereheat 20 and in particular non-axially aligned conveying air duct 3, so that regardless of the rotational orientation of the nozzle assembly 100 the propellant air duct 3 of the nozzle assembly 100 is always conveyed air can be supplied.
  • the exemplary embodiment of the powder delivery injector 50 of the present invention further includes a powder conduit port 24 for connecting a powder conduit, particularly a powder hose, to the downstream end portion of the capture nozzle 11 of the nozzle assembly 100.
  • a powder conduit port 24 for connecting a powder conduit, particularly a powder hose, to the downstream end portion of the capture nozzle 11 of the nozzle assembly 100.
  • the powder line connection 24 is detachably connected to the downstream end region of the catching nozzle 11 of the nozzle arrangement 100.
  • the powder conduit connection 24 may be formed as a hose nozzle, which is slipped over the downstream end portion of the catching nozzle 11. It is conceivable in this context that the formed for example as a hose nozzle powder line connection 24 is mounted in its over the downstream end portion of the catching nozzle 11 state by means of a union nut on the injector 20. According to the exemplary embodiment of the Pulverohninjektors 50 shown in the drawings, however, instead of such a union nut, a locking device 60 is used, with which the powder line connection 24 is detachably connectable to the injector 20.
  • the powder line connection 24, which is designed in particular as a hose nozzle, is detachably connected to the downstream end region of the catching nozzle 11 in such a way that an annular space 26 is defined, which is defined by the nozzle arrangement 100, the injector housing 20 and the powder line connection 24, when the nozzle arrangement 100 together with the powder line connection 24 is at least partially received in the injector housing 20 (see, for this purpose, the schematic sectional view of FIG. 3).
  • This annular space 26 communicates fluidly with a metering air channel 27 formed in the injector housing 20, via which, as required, metering air can be supplied to the annulus 26.
  • the dosing air fed into the dosing air channel 27 of the injector housing 20 can then be mixed with the mixture of conveying air and coating powder via these dosing air ducts.
  • the ribs 28 provided in particular at the upstream end region of the powder line connection 24, which is preferably designed as a hose nozzle, are helical in order to give a certain twist to the metering air to be supplied to the conveying-air coating powder mixture.
  • 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 by hand.
  • the powder line connection 24, which is designed in particular as a hose nozzle, may consist of an electrically non-conductive material and may be surrounded on the outside by a layer or a sleeve of electrically conductive material.
  • the sleeve surrounding the hose connection in particular formed powder line connection 24 may consist for example of metal or an electrically conductive plastic. It would be conceivable, for example, to use as a powder line connection 24 a hose nozzle, as described in the publication DE 202 04 116 U l.
  • FIG. 6 describes another exemplary embodiment of the powder delivery injector 50 according to the invention.
  • the exemplary embodiment of the powder delivery injector 50 has a structure that is basically similar in structure to that described above with reference to the illustrations in FIG. 3 to 5 described Pulverschinjektor 50 corresponds. Accordingly, the powder delivery 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 powder feed injector 50 shown in FIG. 6 illustrated nozzle assembly 100 preferably corresponds to the nozzle assembly 100, as previously with reference to the illustrations in FIG. 1 and 2 has been described. To avoid repetition, reference is therefore made to the previous statements.
  • the Pulver bulkinjektor 50 has a powder feed channel 29, which communicates with a powder container (hopper) in terms of flow, wherein the Pulverzu Foodkanal 29 preferably at least substantially axially to the conveying axis runs (see FIG 3), as in FIG .. 6 and 7, but it is also conceivable that the powder feed channel 29 of the Pulverohninjektor 50 is slightly angled relative to the conveying axis.
  • the Pulver bulkinjektor 50 further comprises a conveying air connection 24, which is connectable via a corresponding filter device 30 with a conveying air hose or the like line. Also, a metering air connection 27 'of the Pulverohninjektors 50 via a corresponding filter device 30 with a Dosier Kunststoffschlauch or the like line connectable.
  • FIG. 7 schematically illustrated further exemplary embodiment of the Pulverohninjektors invention 50 corresponds substantially to the embodiment of FIG. 6, wherein in the embodiment of FIG. 7 but no filter means 30 are provided.
  • the powdered powder conveyed by the powder conveying injector 50 according to the present invention can be conveyed from the powder conveying injector 50 to another container or to a spraying device, for example a manual or automatic spray gun, with which the coating powder is sprayed onto articles to be coated.
  • a spraying device for example a manual or automatic spray gun
  • the strength of the powder volume flow (delivered amount of powder per unit time) is mainly dependent on the strength of the negative pressure or vacuum in the negative pressure region at the upstream end of the motive nozzle 1 and thus primarily on the strength of the conveying air flow.
  • the conveying air flow can become so weak that powder deposits are formed 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 downstream of the underpressure region in order to set the total amount of air required for a deposit-free powder delivery in the powder line.
  • one or more metering air connections IT for the metering air can be provided downstream of the catching nozzle 11 or in the catching nozzle 11 or upstream of the catching nozzle 11.
  • the powder feed channel 29 it is not absolutely necessary for the powder feed channel 29 to be formed axially with respect to the longitudinal axis L of the jet-catching channel 12. Rather, the powder feed channel 29 extends at an obtuse angle of approximately 45 °. However, this is preferably not true for the powder inlet 5 of the nozzle arrangement 100, which is preferably designed axially with respect to the longitudinal axis L of the jet-trapping channel 12.
  • the powdered powder conveyed by the powder delivery injector 50 is used in particular for the electrostatic spray coating of objects and can For example, plastic, ceramic or other coating material.
  • the invention is not limited to installations for the electrostatic spray coating of articles with coating powder, but can also be used to convey powder for other purposes.

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  • Nozzles (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Abstract

L'invention concerne un ensemble tube de Venturi (100) pour des injecteurs de fourniture de poudre (50) ainsi que des injecteurs de fourniture de poudre (50) correspondants. L'ensemble tube de Venturi (100) comprend une première zone, qui sert de buse de propulsion (1), et une deuxième zone, qui sert de buse de réception (11), la deuxième zone présentant un canal servant de canal de réception de jet (12) et pourvu d'un axe longitudinal (L), et la première zone présentant une ouverture de buse (4), laquelle est opposée axialement au canal de réception de jet (12), la première et la deuxième zone de l'ensemble buse (100) étant reliées l'une à l'autre en étant réunies de manière inséparable en tant qu'élément.
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 true EP3582904A1 (fr) 2019-12-25
EP3582904B1 EP3582904B1 (fr) 2021-09-29

Family

ID=60421784

Family Applications (1)

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)

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

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WO2018149524A1 (fr) 2018-08-23
CN110352097A (zh) 2019-10-18
US20200047200A1 (en) 2020-02-13
US11446683B2 (en) 2022-09-20
DE102017103316A1 (de) 2018-08-23
EP3582904B1 (fr) 2021-09-29

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