EP0394084A1 - Elektrostatische Farbspritzanlage für eine leitende Flüssigkeit und Isolierungsvorrichtung für ein Versorgungssystem einer leitenden Flüssigkeit - Google Patents

Elektrostatische Farbspritzanlage für eine leitende Flüssigkeit und Isolierungsvorrichtung für ein Versorgungssystem einer leitenden Flüssigkeit Download PDF

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Publication number
EP0394084A1
EP0394084A1 EP90400880A EP90400880A EP0394084A1 EP 0394084 A1 EP0394084 A1 EP 0394084A1 EP 90400880 A EP90400880 A EP 90400880A EP 90400880 A EP90400880 A EP 90400880A EP 0394084 A1 EP0394084 A1 EP 0394084A1
Authority
EP
European Patent Office
Prior art keywords
valve
isolation
section
liquid
installation according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90400880A
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English (en)
French (fr)
Inventor
Patrice Giroux
Jean-Christophe Rey
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 SA
Original Assignee
Sames SA
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 Sames SA filed Critical Sames SA
Publication of EP0394084A1 publication Critical patent/EP0394084A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B05B5/1658—Details
    • B05B5/1666—Voltage blocking valves, e.g. with axially separable coupling elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/14—Arrangements for controlling delivery; Arrangements for controlling the spray area for supplying a selected one of a plurality of liquids or other fluent materials or several in selected proportions to a spray apparatus, e.g. to a single spray outlet
    • 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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B05B5/1625—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom
    • 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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B05B5/1625—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom
    • B05B5/1633—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom the arrangement comprising several supply lines arranged in parallel, each comprising such an intermediate container
    • 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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1616—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material
    • B05B5/1625—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom
    • B05B5/1641—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive and the arrangement comprising means for insulating a grounded material source from high voltage applied to the material the insulating means comprising an intermediate container alternately connected to the grounded material source for filling, and then disconnected and electrically insulated therefrom an additional container being provided downstream the intermediate container
    • 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
    • B05B5/16—Arrangements for supplying liquids or other fluent material
    • B05B5/1608—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive
    • B05B5/1675—Arrangements for supplying liquids or other fluent material the liquid or other fluent material being electrically conductive the supply means comprising a piston, e.g. a piston pump

Definitions

  • the invention relates to an installation for electrostatic projection of a conductive liquid product, in particular a coating product such as a water-based paint or a metallic paint; the invention relates more particularly to an improvement making it possible to quickly and effectively establish the necessary electrical insulation between the projection device brought to high voltage and other parts of the installation connected to the earth potential, such as for example distribution circuits and / or tanks for such liquids.
  • the invention also relates to an isolation device for a distribution circuit of a conductive liquid product.
  • an intermediate tank electrically isolated from the ground, of relatively small capacity, and capable of being supplied from time to time with coating product.
  • An adjustable or interruptible high voltage source is then provided and means for separating or at least electrically isolating the intermediate tank from the structural elements permanently connected to the ground, during the spraying phases of the coating product.
  • the invention relates to a new insulation device capable of being inserted between the structural elements connected to the ground and those which are capable of being brought to a high voltage.
  • the invention therefore relates to an installation for electrostatic projection of a conductive liquid product, in particular a coating product, of the type comprising a part connected to the ground potential, at least one intermediate reservoir isolated from the ground and at least one electrostatic projection device connected to an adjustable or interruptible voltage source, said intermediate tank being connected to supply said projection device, characterized in that it comprises at least one isolation device comprising a section of conduit made of material electrically insulating of a predetermined length and comprising an inlet and an outlet for liquid, respectively provided at the ends of this section of duct, a piston for scraping the internal wall of said section of duct, movable inside thereof and means for moving said piston in said section of conduit.
  • the invention also relates to an electrical insulation device for a circuit for distributing a conductive liquid, characterized in that it comprises a section of conduit made of electrically insulating material of a predetermined length and comprising an inlet and an outlet for liquid respectively provided at the ends of this section of pipe, a scraper piston of the internal wall of said section of pipe, movable inside the latter and means for moving said piston in said section of pipe.
  • an insulation device 11 comprising a section of conduit made of electrically insulating material 12 of a predetermined length, a scraping piston 14 of the internal wall of this section of conduit and means for moving this scraper piston in said section of conduit.
  • the scraping piston is provided with an O-ring 15 made of elastomeric material which is applied against the internal wall of the section of conduit.
  • the means for moving the piston consist of a jack 16, here a double-acting pneumatic cylinder, located in the extension of the section of conduit 12 and whose rod 18 of insulating material is fixed to said scraping piston 14.
  • This the latter is either of conductive material or of insulating material and comprises, on the side of the rod 18, a conductive part in contact with the paint to avoid electrical leaks along the piston when the latter is in the vicinity of the conduit 36, which leaks could damage the seal 15.
  • the length of the insulating duct section 12 is predetermined so that the leakage current remains below a chosen value in the presence of a given high voltage, between its ends, as soon as the internal surface of this duct section is sufficiently rid of conductive product by said scraping.
  • the section of conduit made of electrically insulating material 12, straight is defined in a cylindrical block 20 of rigid electrically insulating material and this block also forms the body of the jack 16 arranged in the axial extension of the section of conduit 12
  • This pneumatic jack 16 is axially delimited by two walls 22, 24 having the form of plugs screwed into tapped parts of a cylindrical recess 26 formed in the block 20.
  • the wall 22 separates the jack from a cylindrical cavity 28, provided with an annular extension 29 surrounding the section of conduit 12; this part will be described in detail later.
  • the wall 24 closes off an open end of the recess 26 and has an orifice 32 for connection to a source of pressurized air, not shown.
  • Another orifice 33 for connection to a source of pressurized air is provided near the wall 22.
  • the piston 34 of the jack 16 moves in the recess 26 between the two orifices 32 and 33.
  • the rod 18 is fixed by one of its ends to the piston 34 and passes through the wall 22, which houses an O-ring 35 ensuring the tightness between the cylinder and the cavity 28.
  • the insulating duct section 12 is directly connected to an orifice 36, on the side of its end opposite to the jack and it communicates with an orifice 38 opening into said annular extension 29 via an isolation valve 40 which will be described later.
  • the orifice 38 constitutes a liquid inlet and that the orifice 36 constitutes the liquid outlet, but it should be noted that the device can be connected in the other direction, as will be seen further (depending on its location in the installation), the orifice 36 then serving as a liquid inlet and the orifice 38 serving as a liquid outlet.
  • the isolation valve 40 arranged in the vicinity of one end of said section of insulating duct 12 has the function of interrupting the circulation of liquid between the adjacent orifice 38 and said section of insulating duct 12. It is constantly urged towards its closed position and it is actuated on opening by the scraper piston itself, when the latter is in the vicinity of this end of said insulating duct section 12, that is to say when it is located in abutment on the side of the actuating cylinder 16, as shown in FIG. 1.
  • said isolation valve 40 comprises a tubular isolation valve 45 provided with a cylindrical sleeve 41 sliding on an internal surface 42 of said annular extension 29 of the cavity 28.
  • the orifice 38 communicates with this annular extension 29 and the sleeve 41 has a passage 43 (here a single hole) allowing the liquid to flow.
  • the seal between the inlet 38 and the duct portion 12 is provided by the support of the end surface of the bearing surface 42 against the facing surface of the valve 45 which can be provided with an elastic seal.
  • the cavity 28 is coaxial with the section of conduit 12 and it communicates with it so that the tubular valve 45 is subject to movement in the axial extension of the section of conduit 12 of which it constitutes one of the ends. It is in fact provided with a bore 46 extending the section of conduit 12 and of the same diameter as the latter.
  • the scraper piston 40 can engage at the end of its travel in this drilling, until it encounters a shoulder 47.
  • a spring 49 is installed in the cavity 28 between the fixed wall 22 and a shoulder of said tubular valve 45. It is mounted with initial compression to urge said tubular valve towards its closed position.
  • said cavity 28 is in communication, through an orifice 48 with a source of compressed air, not shown.
  • the pressure which is thus established in the cavity 28 also urges the valve 45 towards its closed position.
  • This pressure is exerted, thanks to the presence of a hole 50 in the valve, on the rear face of the scraper piston, that is to say that which is not in contact with the liquid present in the section of conduit 12.
  • the piston 14 is thus subjected to an air back pressure opposing the pressure exerted by the liquid in the section of conduit 12.
  • the device is connected so that the conduit 12 is inserted into a liquid distribution circuit driver.
  • the scraper piston 14 As long as the scraper piston 14 is in the position illustrated in FIG. 1 (air pressure maintained at the orifice 33 of the jack 16) it pushes the sliding valve to the right considering FIG. 1 and the passage 43 is free.
  • the conductive liquid can therefore circulate between the orifices 38 and 36.
  • FIG. 2 schematically represents an installation for electrostatic projection of an electrically conductive liquid coating product.
  • This installation essentially comprises a coating product changing unit 60, known per se, at least one electrostatic projector 61 of said coating product, connected to an adjustable or interruptible high voltage source 62, an intermediate tank 64 capable of storing a certain amount of coating product and an insulation device 11 according to FIG. 1.
  • the intermediate tank 64 is structurally isolated from the ground.
  • the insulation device 11 is shown very schematically with its three essential elements: the insulating duct section 12, the isolation valve 40 and the jack 16.
  • the coating product change unit 60 includes controlled valves 66, respectively connected to distribution circuits for different coating products A, B, C, a controlled valve 68 connected to a rinse aid distribution circuit R and a controlled valve 69 connected to a compressed air distribution circuit S, for blowing. All these valves open into the same manifold 70 connected to a volumetric counter 72, for example of the gear type.
  • a controlled bypass valve 73 is connected in parallel to the counter 72.
  • the output of this counter is connected to a flexible pipe 74, insulating, generally a few meters in length, connected to a projection unit 75.
  • the unit of change of coating product 60 is structurally at ground potential.
  • the pipe 74 is connected to a connection valve 76, the outlet of which is itself connected to the isolation valve 40.
  • the "outlet" of the insulating duct section 12 is connected to the intermediate tank 64 as well as to the projection device 61, via a valve 78. Said insulating duct section 12 is therefore structurally inserted between the coating product changing unit 60 and the intermediate reservoir 64.
  • This is here a sealed and pressurized container, the upper part of which receives compressed air, via a pressure regulator 80.
  • the jack 16 is controlled by a source of compressed air 81, via a three-way valve 82.
  • the rinse aid distribution circuit R is connected to the inlet of the isolation valve 40, via a rinse valve 84.
  • a purge valve 86 for the evacuation of waste, has its inlet connected at the same point as the rinse valve.
  • the three valves 76, 84 and 86 are arranged near the isolation device 11, as close as possible to the inlet of the isolation valve 40. The operation is as follows.
  • one of the valves 66 corresponding to a chosen coating product is controlled and this coating product flows into the pipe 74, passes through the valve 76 and the isolation valve 40 (open), flows in the insulating duct section 12 and accumulates in the intermediate tank 64, the valve 78 being closed.
  • the voltage of the source 62 is brought back to zero.
  • the regulator 80 is in a position such that the pressure of the coating product can discharge the air contained in the reservoir through its venting hole.
  • the valves 66 and 76 are closed and the valve 82 is controlled to cause actuation of the actuator 16 driving, as we have seen below above, the closure of the isolation valve 40 and the displacement of the scraper piston.
  • the coating product contained in the insulating duct section is therefore pushed back towards the intermediate reservoir 64.
  • the scraper piston reaches the end of its travel, the intermediate reservoir and the electrostatic projection device 61 are already electrically isolated. of the coating product change unit 60 connected to earth.
  • the electrostatic spraying of the coating product can start as soon as the valve 78 is opened and the high voltage applied.
  • the reservoir 64 is possibly filled, whenever it is necessary and as long as the coating product does not change, during a short interruption of the spraying, by bringing the high voltage to zero and by actuating the isolation device 11.
  • the last filling of the reservoir 64 is extended after closing the valve 66 by opening the valve 73 and the valve 69. This has the effect of repelling with air practically all of the coating product contained in the conduit 74.
  • the valve 76 is again closed and the last spraying phase before the change of the coating product takes place normally.
  • the coating product change unit 60, the counter 72, the valve 73, the conduit 74 and the valve 76 can be cleaned by successive injections of product rinsing and compressed air by successively controlling the valves 68 and 69.
  • the purge valve 86 is open.
  • the installation of FIG. 3 comprises, like the previous one, a unit for changing the liquid coating product 60, a volumetric counter 72 and a bypass valve 73, a connection valve 76, a rinsing valve 84 and a purge 86.
  • the arrangement of these various elements is the same as above and will not be described in more detail.
  • the installation also includes at least one electrostatic projection device 61 and its adjustable or interruptible high voltage source 62.
  • the installation differs from the previous one in that it comprises two branches 90A, 90B for circulation and intermediate storage of the coating product, arranged in parallel between the coating product changing unit 60 and the projection device electrostatic 61.
  • Each branch 90A or 90B comprises an intermediate reservoir 64A, 64B, isolated from the ground, an upstream isolation device 11A1, 11B1 and a downstream isolation device 11A2, 11B2, respectively.
  • An isolation device is said to be “upstream” if it is upstream of the intermediate tank or “downstream” if it is downstream of the intermediate tank by considering the direction of flow of the coating product.
  • Each intermediate tank is here of the same type as above, that is to say a pressurized tank, supplied with compressed air, here by a source of compressed air 81, via a pressure regulator 80A, 80B, respectively.
  • each upstream isolation device 11A1, 11B1 is connected between the common point of the three valves 76, 84 and 86 (by its isolation valve 40) and the corresponding intermediate tank 64A, 64B.
  • the three aforementioned valves are connected to the upstream junction point of the two parallel branches 90A, 90B and close to the isolation valves of the two corresponding upstream isolation devices.
  • Each downstream isolation device 11A2, 11B2 is connected between the corresponding intermediate tank 64A, 64B and an input of a three-way valve 92 whose output is connected to the projector 61.
  • Each downstream isolation device is connected to the valve 92 by its isolation valve 40.
  • the isolation valve of the upstream isolation device is located on the side of its liquid inlet while the isolation valve of the downstream isolation device is located on the side of its liquid outlet, considering the normal direction of flow of the liquid during a spraying phase.
  • a three-way valve 82A, 82B (connected to the compressed air source 81) distributing in each branch the actuating air of the jacks 16, is connected to these jacks by connections suitable for actuating said cylinders simultaneously and in opposite directions.
  • the intermediate tanks 64A, 64B can be of relatively small capacity (for example of the order of 50 cm3) so that they can be quickly cleaned with reduced consumption of rinse aid.
  • the two branches 90A, 90B are switched alternately by the appropriate control of the valves 82A, 82B and 92.
  • the spraying interruption only lasts for the switching time of the three-way valve 92 and is therefore of no consequence on electrostatic projection.
  • One of the intermediate reservoirs can be filled while the other supplies the projection device 61. In fact, the intermediate reservoir being filled is isolated from high voltage by the insulating duct section of its downstream isolation device .
  • the spraying is interrupted, which corresponds to the time necessary to pass from one object to be covered to another. During this time, the high voltage is reduced to zero.
  • the branch 90A is then cleaned in the same way as the branch 90B and the parts extending between the isolation valves of the downstream isolation devices and the projection device 61 are then cleaned. To do this, liquid rinsing is alternately pushed through the downstream isolation devices and evacuated by the projection device 61. After purging of the entire installation by injection of compressed air, the new coating product can be admitted into the one of the intermediate tanks and the spraying of this new product can start while the second intermediate tank is filling.
  • the installation which has just been described allows extremely rapid changes of coating product, in particular because of the low volumes to be cleaned, as indicated above, and also because the duration of spraying interruption is reduced to the time which is necessary to clean only one of the two branches and the projection device itself.
  • each isolation valve 40 of the downstream isolation device 11A2, 11B2 is connected to an inlet of a three-way valve 92A or 92B, respectively.
  • Each of these valves has a single inlet and two outlets. The outputs are connected two by two. Two such outlets are connected to the projection device 61 while the other two are connected to a waste recovery tank 95, electrically isolated from the ground.
  • Valves 92A, 92B can be disposed near the projector 61. With this arrangement, it is possible to pass through the projection device 61 an amount of rinse aid strictly necessary for its own cleaning. It saves time because it becomes possible to completely clean one of the branches (up to the corresponding valve 92A or 92B) during the last projection phase provided by the other branch and even to fill it with the new coating product. .
  • FIG. 3 In the case where it is not possible to use an isolated waste recovery tank, the installation of FIG. 3 can nevertheless be improved by completing it as shown in FIG. 5.
  • a device is inserted additional insulation 11A3, 11B3, in each branch, between the corresponding intermediate tank 64A, 64B and a waste recovery tank 98 at earth potential.
  • Each additional isolation device is mounted so that its isolation valve 40 is on the side of said intermediate tank. This arrangement simplifies the rinsing cycles of the intermediate tanks by avoiding the return of rinsing liquid to the purge valve 86 (not shown in FIG. 4, see FIG. 3), the rinsing liquid always flowing in the same direction, from the valve 84 to the recovery tank 98.
  • the two isolation devices 11A3 and 11B3 are controlled "in phase opposition".
  • the pressurized intermediate tanks can be replaced by membrane or rigid piston tanks.
  • the membrane or the piston separates the reservoir into two chambers with variable volume, one of the chambers receiving the coating product and the other an actuating fluid (air or liquid) ensuring the pressurizing said coating product.
  • figure 6 is more particularly indicated whenever it is necessary to power an electrostatic projection device without interruption for long periods of time. In this case, it is known to use two intermediate tanks in cascade.
  • the installation comprises, as before, a coating product changing unit 60 connected by a pipe 74 to a downstream isolation device 111, then to a first intermediate tank 100, then to a downstream isolation device 112.
  • the two isolation devices are called “upstream” and “downstream” with respect to the intermediate tank 100. They are mounted in the same way as in one of the branches 90 of FIG. 3 and controlled simultaneously in opposite directions by a gate valve.
  • the connection point of the two isolation devices and of the intermediate tank 100 is connected to a waste recovery tank 118, isolated of the earth, via a controlled purge valve 120.
  • the intermediate tank 100 is, according to the example, a rigid piston tank separating the coating product from its pressurization fluid. This is admitted into the intermediate tank by a pressure regulator 122 or any other suitable control means.
  • the output of the isolation device 112 is connected to a second intermediate reservoir 126 and to a positive displacement pump 130 supplying the projection device 61 brought to high voltage by the high voltage source 62. Between the output of the isolation device 112 and the pump 130 are also connected: a compressed air injection valve 132 supplied by a source S, a purge valve 134 and a third isolation device 138. The latter is connected, by its isolation valve 40 to the rinse aid distribution circuit R.
  • the outlet of the purge valve 134 opens into a waste recovery tank 136, isolated from the ground.
  • the intermediate tank 126 is here of the membrane type. Pressurizing fluid (compressed air, for example) is admitted into this intermediate tank using a pressure regulator 140 or any other suitable control means. The operation is as follows.
  • the reservoir 126 supplies the electrostatic spraying device 61 via the positive displacement pump 130.
  • the intermediate reservoir 100 is sometimes connected to the coating product change unit 60 and sometimes connected to the intermediate tank 126 to fill it.
  • the electrical isolation of the tank 100 is normally provided by the isolation device 112 when the intermediate tank 100 is actually connected to the coating product change unit and it is therefore at ground potential.
  • the isolation device 111 which performs the electrical insulation between the tank 100 and the coating product change unit.
  • the presence of the positive displacement pump 130 makes it possible to obtain a constant flow rate of coating product towards the spraying device.
  • Rinse aid and air are supplied by the coating product change unit.
  • the rinse aid is discharged to the insulated recovery tank 118, via the purge valve 120.
  • the projection is interrupted and the high voltage is reduced to zero.
  • the tank 126, the pump 130 and the spraying device 61 are then cleaned and dried.
  • the rinsing product is introduced from the isolation device 138 and the air is introduced by controlling the valve 132. .
  • the simultaneous movement of the two upstream and downstream isolation devices takes place without significant variation in the volume of coating product stored in the intermediate tank located between these two devices.
  • This can make it possible to control the position of the rigid piston or of the membrane, for example by replacing the compressed control air with an incompressible fluid, such as insulating oil, the flow rate of which is controlled.
  • the intermediate tanks described with reference to FIG. 6 can be replaced by intermediate tanks pressurized by air, like those of FIGS. 2 to 5.
  • FIGS. 3 to 6 comprising “upstream” and “downstream” isolation devices
  • pairs of such devices supplied by a single three-way valve so that their actuation is reciprocal, simultaneous and automatic. This avoids any risk of short circuit which could result from the actuation of a single device.
  • it is desired for example to perform cleaning, emptying, complete blowing, through and through, of an intermediate tank and of the isolation devices, it is possible to use two three-way valves controlled separately, the programming of the control ensuring either a reverse movement of the isolation devices, as in the previous case, or a joint movement, during the cleaning phase.

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  • Electrostatic Spraying Apparatus (AREA)
EP90400880A 1989-04-19 1990-03-30 Elektrostatische Farbspritzanlage für eine leitende Flüssigkeit und Isolierungsvorrichtung für ein Versorgungssystem einer leitenden Flüssigkeit Withdrawn EP0394084A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8905220 1989-04-19
FR8905220A FR2646106B1 (fr) 1989-04-19 1989-04-19 Installation de projection par voie electrostatique d'un produit liquide conducteur et dispositif d'isolation pour un circuit de distribution d'un produit liquide conducteur

Publications (1)

Publication Number Publication Date
EP0394084A1 true EP0394084A1 (de) 1990-10-24

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Application Number Title Priority Date Filing Date
EP90400880A Withdrawn EP0394084A1 (de) 1989-04-19 1990-03-30 Elektrostatische Farbspritzanlage für eine leitende Flüssigkeit und Isolierungsvorrichtung für ein Versorgungssystem einer leitenden Flüssigkeit

Country Status (5)

Country Link
US (1) US5096126A (de)
EP (1) EP0394084A1 (de)
JP (1) JPH02293064A (de)
CA (1) CA2013964A1 (de)
FR (1) FR2646106B1 (de)

Cited By (5)

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Publication number Priority date Publication date Assignee Title
FR2669245A1 (fr) * 1990-11-20 1992-05-22 Sames Sa Installation de projection electrostatique de produit de revetement liquide conducteur.
EP0593238A1 (de) * 1992-10-15 1994-04-20 Nordson Corporation Vorrichtung und Verfahren zur Abgabe von leitfähigen Beschichtungsmaterialien
FR2726880A1 (fr) * 1994-11-01 1996-05-15 Graco Inc Dispositif a isolement de tension pour commander l'isolement d'un liquide conducteur
US5549755A (en) * 1994-12-08 1996-08-27 Nordson Corporation Apparatus for supplying conductive coating materials including transfer units having a combined shuttle and pumping device
US8737537B2 (en) 2006-03-29 2014-05-27 Thomson Licensing Frequency translation module frequency limiting amplifier

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Publication number Priority date Publication date Assignee Title
CA2053671C (en) * 1990-11-08 1998-08-04 Ichirou Ishibashi Electrostatic spray painting apparatus
GB2249976B (en) * 1990-11-08 1994-08-03 Honda Motor Co Ltd Method of and apparatus for electrostatically spray-coating a workpiece with paint
CA2135617C (en) * 1992-05-15 1999-12-07 Ole Arnt Anfindsen Paint dosage device for program controlled spray painting system
US5341990A (en) * 1993-06-11 1994-08-30 Nordson Corporation Apparatus and method for dispensing electrically conductive coating material including a pneumatic/mechanical control
US5364035A (en) * 1993-12-20 1994-11-15 Graco Inc. High voltage sealing and isolation via dynamic seals
US5944045A (en) * 1994-07-12 1999-08-31 Ransburg Corporation Solvent circuit
US5647542A (en) * 1995-01-24 1997-07-15 Binks Manufacturing Company System for electrostatic application of conductive coating liquid
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FR2646106A1 (fr) 1990-10-26
CA2013964A1 (fr) 1990-10-19
US5096126A (en) 1992-03-17
FR2646106B1 (fr) 1991-07-19
JPH02293064A (ja) 1990-12-04

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