EP2986857B1 - Pompe a effet venturi et installation d'application de revetement de peinture - Google Patents

Pompe a effet venturi et installation d'application de revetement de peinture Download PDF

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Publication number
EP2986857B1
EP2986857B1 EP14719684.4A EP14719684A EP2986857B1 EP 2986857 B1 EP2986857 B1 EP 2986857B1 EP 14719684 A EP14719684 A EP 14719684A EP 2986857 B1 EP2986857 B1 EP 2986857B1
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EP
European Patent Office
Prior art keywords
air
ring
pump
pump according
powder
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
EP14719684.4A
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German (de)
English (en)
French (fr)
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EP2986857A1 (fr
Inventor
Christophe Pravert
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.)
Sames Kremlin SAS
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Sames Technologies SAS
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Publication of EP2986857A1 publication Critical patent/EP2986857A1/fr
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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
    • 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
    • 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
    • B05B5/047—Discharge apparatus, e.g. electrostatic spray guns using tribo-charging
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10—Valves; Arrangement of valves
    • F04B53/1075—Valves; Arrangement of valves the valve being a flexible annular ring
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
    • F04F5/24—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing liquids, e.g. containing solids, or liquids and elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/461—Adjustable nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F04F5/466—Arrangements of nozzles with a plurality of nozzles arranged in parallel

Definitions

  • the present invention relates to a powder pump of Venturi technology used, in particular in a method of electrostatic powder coating paint application.
  • a pump with Venturi effect is a relatively simple and inexpensive organ.
  • This body is based on the Venturi effect which consists of creating a vacuum by injecting air at high speed in order to suck powder from a reservoir that can contain a bed of fluidized powder and then convey it to to a pneumatic or electrostatic applicator by means of a pipe adapted to the transport of powder.
  • a pneumatic or electrostatic applicator In order to more easily suck up the powder at the base of the tank, air is injected into the tank to fluidize the powder.
  • this type of pump can be used to obtain paint flows from the pump. order of fifty to five hundred grams per minute.
  • a pump with a Venturi effect most often comprises a powder suction pipe immersed in the powder tank, an air connection which makes it possible to create a vacuum within the suction duct and an ejector which makes it possible to evacuate the mixture. air / powder inside a transport hose and towards the electrostatic applicator or, more simply, the gun.
  • a pump of this type is therefore most often powered by a pneumatic device generating two air circuits, an "injection” air circuit and a “dilution” air circuit.
  • the pneumatic organ regulates the pressure or the air flow mixed with the powder. Regardless of the mode of regulation chosen, the pneumatic injection and dilution air supply members are sensitive to the rise of powder that can be observed during transient pumping phases or during the cleaning phases.
  • the dilution air circuit is much more sensitive to these rising powder. Indeed, it is sometimes inactive in the pumping phase when the air flow Injection alone makes it possible to transport without pulsations.
  • the dilution air supply circuit is at zero relative pressure, while a pressure of the order of a few tens of millibars reigns at the outlet of the pump in the mixture to be transported.
  • a powder-fed reverse current flows to the pneumatic members of the module.
  • the cleaning phases are also conducive to the rise of powder in the dilution circuit.
  • protective barriers can be integrated at the level of the pneumatic module itself, or in the supply circuits, between the module and the pump, or at the level of the injection air supply and dilution connections. the pump.
  • These protective barriers generally consist of a porous media or a non-return valve such as for example a ball valve or a membrane valve.
  • EP-A-0 552 744 and EP-A-0 913 203 each disclose a Venturi effect pump provided with a check valve. However, this valve does not surround the ejector radially, so that the blocking of the rising of powder is not effective.
  • the invention intends to remedy more particularly by proposing a Venturi effect pump provided with an effective protective barrier and not constituting a wear part.
  • the invention relates to a Venturi effect pump, for sucking a powder from a reserve, to dilute it and then to convey it to a gun via a transport pipe.
  • This pump comprises an external body, at least one powder suction pipe, at least two air connections, among which a first air connection is able to supply an air injector to create a depression in the duct.
  • a second air connection is adapted to feed a dilution air circuit separated from the powder flow, at least one powder outlet ejector, centered on a diffusion axis, the inlet of which is situated downstream of the first air connection and the suction duct, at least one protective barrier arranged inside the dilution of air and at least one outlet end of the dilution air circuit, disposed around the ejector and also connected to the transport pipe.
  • the protective barrier comprises a non-return valve which radially surrounds the ejector.
  • the pneumatic air supply members are protected from the return of powder economically since the protective barrier does not constitute a wear part and therefore does not need to be replaced during the operating period of the Venturi pump.
  • the invention also relates to an installation for applying a powder coating product, comprising a reservoir, in which the powdery product is fluidized, a pneumatic supply module, supplying an "injection" air circuit, and a fuel injection circuit. 'air' of dilution, a pump with Venturi effect powered by the module pneumatic supply and conveying coating product from the reservoir to a gun while the Venturi effect pump is as previously described.
  • FIG. 1 and 2 There is shown a Venturi pump 2 for use in a powder coating paint application apparatus.
  • the Venturi effect pump 2 extends along a main axis Y2 and comprises an outer body 20.
  • the outer body 20 has a plurality of openings for receiving different inlet and outlet ducts.
  • the inlet ducts there is a first suction duct 22 of generally cylindrical shape and centered on an axis Z22.
  • the suction duct 22 is connected upstream to a tank A which is not shown and which contains a bed of fluidized powder.
  • the Venturi effect pump 2 also includes at its inlet a first air injection connector 24.
  • the connector 24 is connected via a duct 25 to a pneumatic supply module B.
  • the injector 242 is located in the extension of the fitting 24 whose section is narrowed so as to accelerate the air at the end of the connector 24 to create a vacuum at the outlet of the injector 242. This is the Venturi effect .
  • the injector 242 belongs to the connector 24.
  • the injector 242 and the connector 24 are two different parts.
  • the air injector 242 opens onto an area 244 located at the downstream end of the suction duct 22. A depression is therefore created in this zone 244, which tends to suck the powder from the tank A to the zone 244 in the direction of the arrow F O at the figure 2 .
  • the zone 244 there is the mixing between the air injected by the connection 24 and the powder sucked into the suction pipe 22.
  • the mixture of air and powder is propelled downstream of the coupling 24, that is to say along the Y242 axis and from the right to the left on the figure 2 .
  • the air / powder mixture thus reaches an ejector 26 which extends along a Y26 diffusion axis, the Y26 axis and the Y242 axis coinciding.
  • the ejector 26 has a downstream end portion, that is to say located on the left side of the ejector 26 to the figure 2 , of an inner section greater than that of the upstream part, or of the part on the right on the figure 2 .
  • the ejector 26 thus has the shape of a nozzle.
  • the fact of using a nozzle shape makes it possible to increase the pressure of the air / powder mixture at the outlet. This makes it easier to route the air / powder mixture to an electrostatic applicator D, especially a gun, through the transport pipe.
  • the Venturi effect pump 2 also includes as input a second air supply connector 28, centered on an axis Z28 which is perpendicular to the axis Y2. It feeds a dilution air circuit, this dilution circuit V28 being separated from the powder flow.
  • This supply duct 28 is also connected to the pneumatic supply module B by a duct 29.
  • the pneumatic supply module B thus provides air in the two connections 24 and 28.
  • the connector 24 is a supply connection called "injection" while the supply connection 28 is a conduit of diet called "dilution".
  • the air injected inside the supply connection 28 passes inside an outlet nozzle 284, this outlet nozzle 284 is disposed around and coaxially with the ejector 26 and having externally projections: therefore a "fir" connection.
  • the passage of the dilution air is annular between the outlet nozzle 284 and the ejector 26.
  • the outlet nozzle 284 and the ejector 26 are connected downstream, that is to say on the left on the figure 2 , to a transport pipe T which conveys the air / powder mixture to the electrostatic applicator or application gun D for coating a piece of paint.
  • the additional air injected into the connection 28 makes it possible to reduce the pulsations that may appear during the transport of the air / powder mixture. These pulsations occur if the transport speed is not sufficient in the pipe resulting in insufficient transport air flow.
  • the diameter of the transport pipe T is optimized according to the powder flow rate to be supplied and the transport distance to be made from the Venturi effect pump 2 to the electrostatic applicator D.
  • the volume present between the outlet nozzle 284 and the ejector 26 is an annular volume V284 which constitutes a dilution chamber.
  • connection 28 The use of additional air or dilution air at connection 28 is actually optional. Indeed, this dilution air supply is sometimes inactivated in the pumping phase when the injection air flow alone allows to ensure a transport without pulsations.
  • the pressure that prevails within the volume V284 is substantially equal to the pressure at the outlet of the ejector 26 which is of the order of a few millibars. This pressure is a consequence of the air / powder flow downstream in the transport pipe.
  • Side pneumatic supply module B the conduit 29 is at zero pressure when the dilution feed is inactivated. At its other end, the conduit 29 is subjected to a pressure substantially equal to that prevailing in the volume V284. Thus part of the air / powder mixture is likely to reach the pneumatic supply module B.
  • the Venturi effect pump 2 further comprises a nonreturn valve 282.
  • This non-return valve 282 ensures, on the one hand, the passage of air freely from upstream to downstream, that is to say, from the supply conduit 28 to the outlet nozzle 284, and secondly, the blocking of the air / powder mixture in the reverse.
  • the nonreturn valve 282 is placed as close as possible to the outlet of the air / powder mixture.
  • the check valve 282 Since it is impossible to position this check valve 282 in the connector "fir", it has been chosen to position it directly at the outlet of the supply conduit 28.
  • the check valve 282 is generally annular shape and is advantageously arranged coaxially around the ejector 26. Thus, the air injected into the dilution circuit is homogeneously distributed in the dilution chamber V284 and the mixture of this dilution air with the powder, at the outlet of the ejector 26 is improved.
  • the check valve 282 comprises a seal ring 2820 and a seal 2822.
  • a volume V2820 is defined as the volume of passage of air from the pneumatic module P to the dilution chamber V284 . This volume includes in particular the channels 2826 to the passage of air in the valve 282 and the throat 2824.
  • the dilution air circuit V28 is constituted by the dilution chamber V284 and the volume V2820 corresponding to the volume borrowed by the air upstream of the V284 dilution chamber.
  • the ring 2820 comprises a plurality of air passage channels 2826, one of which is visible to the figure 3 .
  • channels 2826 are installed at the outlet of the supply conduit 28, extend parallel to the diffusion axis Y26 and open on a groove 2824 formed by two chamfers 2828.
  • the channels 2826 open on the narrowed part of the throat that is, where the gap, taken parallel to the Y26 axis, between the chamfers 2828 is the smallest.
  • the channels 2826 are positioned radially on the axis Y26, on the outside 2824.
  • the groove 2824 extends over the entire periphery of the seal ring 2820, while the air passage channels 2826 are regularly distributed around the diffusion axis Y26. This allows air injection which is homogeneous in the groove 2824 and in the dilution chamber V284.
  • the groove 2824 widens, radially to the axis Y26, ie along a central axis Z2824, inwards.
  • the two chamfers 2828 are arranged symmetrically with respect to the central axis Z2824 and are inclined at an angle of about 45 ° with respect to this central axis. Between the two chamfers 2828 is disposed an O-ring 2822.
  • the seal 2822 has an annular section whose diameter D1 is greater than the minimum opening distance D2 of the groove 2824. Thus, the seal 2822 is able to close the throat 2824.
  • the air injected into the passage 2826 tends to compress the seal 2822 in a direction radial to the Y26 axis and directed inwardly. This direction is represented by the arrow F1 at the figure 3 .
  • a shoulder 2829 is provided in the ring 2820 and is radially located inside the O-ring 2822.
  • the seal is elastically deformed so as to move from a first position shown in FIG. figure 3 where it closes the groove 2824 to a second position shown in the figure 4 where it is possibly bearing against the shoulder 2829 of the ring.
  • the inlet air pressure is too low, the seal is compressed radially but does not reach the shoulder 2829.
  • the air can flow along the chamfers 2828, as represented by the arrows F2 on the figure 4 .
  • the gasket 2822 is expanded, that is to say pressed against the chamfers 2828 and closes the groove 2824.
  • the nonreturn valve 282 is designed so that it has the least areas of retention powder possible.
  • the valve 282 is cleaned simply during the passage of the dilution air because the entire seal is bathed by the air flow.
  • the valve 282 is advantageously disposed coaxially with the ejector 26, thus limiting the compressible volume V284 which separates the valve 282 from the powder outlet. This makes it possible, on the one hand, to facilitate the cleaning of the dilution chamber V284 and, on the other hand, to limit the infiltrations of the air / powder mixture arriving at the outlet of the ejector 26 in the volume V284.
  • the outlet tip 284 is made of a generally electrically conductive material and caps the ejector 26 to its downstream end. Thus, the outlet nozzle 284 is practically indestructible and makes it possible to discharge a portion of the triboelectric charges present on the ejector 26.
  • the passageways for the passage of the powder, namely the suction duct 22 and the ejector 26, are made of suitable plastic, so as not to polymerize the powder on contact.
  • the dilution air is therefore added to the mixture of air and powder injected upstream.
  • the injection air and dilution air flows add up and form a total air flow rate of the powder coating product.
  • a good adjustment of the transport air flow ensures a transport without pulsations, that is to say smoothly and at a constant rate. In this way, the application of the powder coating product is uniform.
  • a seal 202 seals the dilution air supply duct relative to the outside.
  • the seal ring 2820 and the body 20 of the pump 2 are monobloc.
  • the ring 2820 can also be integrated in the outlet nozzle 284 or in the ejector 26.
  • the nonreturn valve 282 can be mounted fixed or removable on the pump 2.
  • a lip seal integrated directly into the dilution chamber, and whose lip preferably deforms in one direction.
  • the direction of deformation of the lip being that of the passage of the dilution air. It is this unilateral deformation of the lip that provides the anti-return function.
  • the installation comprising the Venturi effect pump 2 uses a non-electrostatic application gun, for example of the pneumatic type.
  • the groove 2824 widens, radially to the axis Y26, towards the outside.
  • the channels 2826 are positioned, radially to the axis Y26, inside the groove 2824 and open on the narrowed portion of the groove 2824.
  • the seal 2822 is therefore radially expanded to allow air to enter the throat 2824.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Nozzles (AREA)
  • Electrostatic Spraying Apparatus (AREA)
EP14719684.4A 2013-04-17 2014-04-16 Pompe a effet venturi et installation d'application de revetement de peinture Active EP2986857B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1353485A FR3004767B1 (fr) 2013-04-17 2013-04-17 Pompe a effet venturi et installation d'application de revetement de peinture
PCT/EP2014/057733 WO2014170374A1 (fr) 2013-04-17 2014-04-16 Pompe a effet venturi et installation d'application de revetement de peinture

Publications (2)

Publication Number Publication Date
EP2986857A1 EP2986857A1 (fr) 2016-02-24
EP2986857B1 true EP2986857B1 (fr) 2017-01-11

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ID=48782401

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14719684.4A Active EP2986857B1 (fr) 2013-04-17 2014-04-16 Pompe a effet venturi et installation d'application de revetement de peinture

Country Status (6)

Country Link
US (1) US9636695B2 (ko)
EP (1) EP2986857B1 (ko)
KR (1) KR102217672B1 (ko)
CN (1) CN105283675B (ko)
FR (1) FR3004767B1 (ko)
WO (1) WO2014170374A1 (ko)

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CN106994400A (zh) * 2016-01-23 2017-08-01 宁波市鄞州吉田电器有限公司 一种静电粉末喷涂机
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CN108644157A (zh) * 2018-07-19 2018-10-12 北京孤岛科技有限公司 一种负压发生器
CN110696186B (zh) * 2019-09-17 2020-08-18 山东科技大学 一种湿式搅拌喷浆一体机
CN110864012B (zh) * 2019-10-29 2021-06-15 合肥工业大学 一种实现真空管道快速柔性隔断的多层油幕隔断装置
CN112756123B (zh) * 2021-02-02 2024-10-11 德清县时杰涂装设备有限公司 一种文丘里吸粉组件、供粉泵及粉末涂料静电喷枪
CN114918055A (zh) * 2022-05-17 2022-08-19 广东省科学院新材料研究所 一种冷喷涂用上下游送粉喷嘴和涂层冷喷涂生产系统
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Also Published As

Publication number Publication date
FR3004767B1 (fr) 2015-05-15
CN105283675B (zh) 2017-03-22
CN105283675A (zh) 2016-01-27
EP2986857A1 (fr) 2016-02-24
FR3004767A1 (fr) 2014-10-24
KR20150142692A (ko) 2015-12-22
WO2014170374A1 (fr) 2014-10-23
KR102217672B1 (ko) 2021-02-19
US20160052001A1 (en) 2016-02-25
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