EP3302819A1 - Procédé pour le fonctionnement d'une pompe à poudre en phase dense ainsi que pompe à poudre en phase dense - Google Patents

Procédé pour le fonctionnement d'une pompe à poudre en phase dense ainsi que pompe à poudre en phase dense

Info

Publication number
EP3302819A1
EP3302819A1 EP16723962.3A EP16723962A EP3302819A1 EP 3302819 A1 EP3302819 A1 EP 3302819A1 EP 16723962 A EP16723962 A EP 16723962A EP 3302819 A1 EP3302819 A1 EP 3302819A1
Authority
EP
European Patent Office
Prior art keywords
powder
pump
valve
compressed air
phase
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
EP16723962.3A
Other languages
German (de)
English (en)
Other versions
EP3302819B1 (fr
Inventor
Felix Mauchle
Hanspeter Vieli
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 EP3302819A1 publication Critical patent/EP3302819A1/fr
Application granted granted Critical
Publication of EP3302819B1 publication Critical patent/EP3302819B1/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
    • B05B7/1459—Arrangements for supplying particulate material comprising a chamber, inlet and outlet valves upstream and downstream the chamber and means for alternately sucking particulate material into and removing particulate material from the chamber through the valves
    • 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
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/06—Valve parameters
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/06—Valve parameters
    • F04B2201/0601—Opening times
    • F04B2201/06011—Opening times of the inlet valve only
    • 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
    • F04B2201/00—Pump parameters
    • F04B2201/06—Valve parameters
    • F04B2201/0601—Opening times
    • F04B2201/06012—Opening times of the outlet valve only
    • 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
    • F04B43/00—Machines, pumps, or pumping installations having flexible working members
    • F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms

Definitions

  • the present invention relates to a method for operating a powder seal pump in the powder delivery mode and to a corresponding powder seal pump.
  • the powder sealant pump is particularly designed to convey powder, in particular coating powder, from a first powder reservoir to a second powder reservoir located downstream of the powder seal pump or to a powder spray gun or powder coating device downstream of the powder seal pump or the like.
  • the powder sealant pump has at least one and preferably exactly one powder feed chamber with a powder inlet and a powder outlet, wherein the powder inlet is assigned a powder inlet valve and the powder outlet is assigned a powder outlet valve, and the powder feed chamber has at least one air exchange opening for alternately pressurizing the powder feed chamber (for supplying transport compressed air) or negative pressure (for sucking in powder).
  • powder in particular coating powder
  • the powder is sucked into the powder feed chamber from a first powder reservoir, and during a subsequent ejection phase, the powder previously sucked into the powder feed chamber to a second, downstream Powder seal pump arranged powder reservoir or a device arranged downstream of the powder seal pump for spraying powder is ejected.
  • the powder inlet valve is at least temporarily opened and the powder outlet valve is at least temporarily closed, while the powder conveying chamber is at least temporarily subjected to negative pressure.
  • the powder inlet valve is at least temporarily closed and the powder outlet valve is at least temporarily opened, while the powder conveying chamber is at least temporarily exposed to overpressure in order to feed at least part of the transport compressed air required for conveying the powder via the powder feed chamber into the powder path.
  • Powder dense phase pumps (dense phase powder pumps) with this mode of operation are at least known in principle from the prior art.
  • EP 1 551 558 A1 relates to a powder sealant pump which has a first powder feed chamber and a second powder feed chamber arranged parallel to the first powder feed chamber.
  • the two powder feed chambers of the known from this prior art Pulverdicht- current pump are bounded both the upstream side and on the conveyor side in each case by a mechanically operated pinch valve.
  • the powder hoses connected to the powder feed chambers of the powder sealing pump can be deformed with a mechanically actuated piston in order to squeeze or open the hose section as required.
  • Each powder feed chamber the known from this prior art powder seal pump is associated with a filter tube which limits the circumference of the corresponding powder feed chamber.
  • the filter tube is permeable to air but not to coating powder and surrounded by an annular chamber to which alternate negative pressure or compressed air can be connected.
  • coating powder can be alternately sucked into each powder feed chamber or ejected by means of compressed air from the corresponding powder feed chamber.
  • the two mutually parallel Pulver cleanse- ammers are operated in alternating phase, which means that one of the two powder feed chambers sucks coating powder through the powder inlet of the powder seal, while the other of the two powder feed chambers a coating powder portion sucked into the powder feed chamber beforehand via the powder outlet of the powder seal pump.
  • Pulverdichtstrompumpen with several, in particular two parallel powder feed chambers are also from the document
  • powder sealant pumps for conveying coating powder to corresponding devices for spraying coating powders, in particular spray-coating guns.
  • powder pumps designed as injectors were used, which are still used today to convey coating powder.
  • powder pumps designed as injectors have the disadvantage that the powder pumps designed as injectors can usually only convey a relatively small amount of coating powder per unit of time.
  • powder seal pumps of the type mentioned in practice have prevailed in particular for those applications in which a relatively large amount of coating powder per unit time is to promote.
  • the amount of powder delivered by a powder sealant pump per unit of time depends in particular on the size (volume) of the delivery chamber, on the frequency with which coating powder is sucked in the delivery chamber and then released again, on the amount of vacuum applied to the powder delivery chamber.
  • to suck powder from a powder reservoir into the powder feed chamber in an intake phase the opening period of the powder inlet valve during the suction phase (intake subcycle), and the flow resistances in the powder lines upstream and, in particular, downstream of the powder seal pump.
  • the flow resistance are particularly dependent on the length and the inner cross section of the powder lines, mostly powder hoses.
  • the transport compressed air introduced into the powder conveying path mixes only slightly with the powder to be conveyed, in particular coating powder, and pushes the powder out of the powder feed chamber through the powder outlet valve.
  • a powder sealant pump as is known, for example, from the publication EP 1 551 558 A1, tends to blockage in the powder delivery mode. This applies in particular to the powder inlet side of the powder seal flow pump and here the powder inlet valve provided there.
  • the object of the invention is to solve the problem in the powder conveying mode of a powder sealant pump of the type mentioned in a simple manner to avoid or at least reduce powder accumulations and powder clogging, in particular on the powder inlet side of the powder feed chamber of the powder sealant pump, and here in the region of the powder inlet valve. This should apply in particular to those types of powders which are prone to clumping and / or buildup during production.
  • the powder sealant pump having at least one and preferably exactly one powder feed chamber with a powder inlet and a powder outlet, wherein the powder inlet a powder inlet valve and the powder outlet is associated with a powder outlet.
  • the powder delivery chamber has at least one air exchange opening for alternately pressurizing the powder delivery chamber (during a discharge phase) or negative pressure (during a suction phase).
  • powder, in particular coating is added during the suction phase.
  • suction powder sucked from a first powder reservoir in the powder conveying chamber and ejected during a preferably immediately after the suction phase discharge phase, the previously sucked powder to a second, downstream of the powder seal pump powder reservoir or a downstream of the powder seal pump means arranged for spraying powder.
  • the powder inlet valve at the powder inlet of the powder feed chamber is at least temporarily open and the powder outlet valve at the powder outlet of the powder feed chamber at least temporarily closed, while the powder feed chamber is at least temporarily subjected to negative pressure, so as to be able to suck the powder from the first powder reservoir.
  • the powder inlet valve at the powder inlet of the powder feed chamber is at least temporarily closed and the powder outlet valve at the powder outlet of the powder feed chamber at least temporarily opened, while the powder feed chamber is at least temporarily subjected to overpressure so as to eject the previously sucked into the powder feed chamber powder through the powder outlet of the powder feed chamber ,
  • the invention provides that during a predetermined or definable period of at least one ejection phase of a plurality of Pump cycles, and preferably at the end of each ejection phase at least one of the following conditions:
  • the powder outlet valve is at least temporarily closed during the predetermined or determinable time period, the transport compressed air introduced during the ejection phase into the powder feed chamber due to the application of overpressure is diverted. This reinforces the backwashing and thus leads to an improved cleaning effect.
  • the period of time during which at least one of said conditions i) to iii) is present in particular individually and independently for all conditions i) to iii).
  • the intensity of the influence of the corresponding conditions can be increased by appropriate variation of the time periods assigned to conditions i) to iii).
  • Advantageous developments of the method according to the invention for operating a powder seal current pump in the powder delivery mode are specified in the dependent claims.
  • the invention further relates to a powder sealant pump for conveying coating powder from a first powder reservoir to a second downstream powder reservoir or a downstream powder spray coating gun or the like device for spraying coating powder.
  • the powder sealant pump has at least one and preferably exactly one single powder feed chamber with a powder inlet and a powder outlet, wherein the powder inlet is assigned a powder inlet valve and the powder outlet is assigned a powder outlet valve.
  • the powder feed chamber of the powder seal current pump according to the invention has at least one air exchange opening, via which the powder feed chamber can be alternately pressurized with negative pressure or reduced pressure.
  • a control device is provided, which is designed to control the powder inlet valve, the powder outlet valve and / or a device for applying a negative pressure or overpressure to the powder feed chamber such that the powder feed method according to the invention is realized or feasible.
  • the powder outlet and the powder outlet valve and the powder inlet valve are arranged by the single powder conveying chamber or by each powder conveying chamber such that its powder passageway extends in the chamber longitudinal direction, preferably axially to the chamber centerline.
  • the powder inlet valve and the powder outlet valve used according to the invention are preferably pinch valves.
  • the valve channel is formed by a flexible, elastic tube which is radially compressible to close the valve, either by a mechanical element or by the pressure of compressed air in a pneumatic chamber surrounding the tube on its outside.
  • the method according to the invention comprises the method step of providing a powder sealant pump of the aforementioned type, and the method step of the method according to the invention. a) generating a negative pressure in the preferably single powder feed chamber of the powder sealant pump for sucking coating powder into the powder feed chamber through an opened powder inlet valve of the powder seal pump while the powder outlet valve of the powder seal current pump is closed is;
  • the invention also relates to a powder spray coating apparatus comprising a powder seal pump of the invention.
  • At least one flow resistance is arranged in the powder flow path upstream or downstream of the powder seal current pump, preferably a flow resistance.
  • the flow resistance variable flow restrictor has the advantage that even small amounts of powder flow per unit time can be promoted by the powder sealant pump with relatively good adherence to a desired value. The reason is that the flow resistance reduces the amount of powder flow per unit time, thereby maintaining the transporting compressed air flow rate per unit time at such a high level as to ensure powder delivery in and downstream of the powder sealant pump without being disadvantageously disadvantageous Powder deposits occur in the powder path.
  • FIG. 1 is a longitudinal sectional view along the powder path through a
  • FIG. 2 is a timing diagram to illustrate an exemplary
  • FIG. 1 shows schematically an exemplary embodiment of a powder spray coating apparatus 100, in which an embodiment of the powder seal current pump 1 according to the invention for conveying powder (here: coating powder) from a first powder reservoir 101 to a powder spray coating gun 102 arranged downstream of the powder seal current pump 1 is used.
  • the powder spray coating gun 102 instead of the powder spray coating gun 102, another device for spraying coating powder onto an object to be coated or a second powder reservoir can also be used.
  • the exemplary embodiment of powder sealant pump 1 according to the invention used therein has a powder inlet 2, which is connected or connectable to a first powder reservoir 101 by means of a powder line 103, in particular by means of an intake pipe or the like.
  • a Pu lverauslass 3 is provided which is connected or connectable by means of a powder line 104, in particular by means of a powder hose, with a coating powder 105 of a powder spray coating gun 102.
  • both the powder inlet 2 and the powder outlet 3 of the powder sealant pump 1 each designed as a hose connection piece to which the corresponding powder line 103 and 104 attachable and can be fixed with a hose clamp.
  • the powder inlet 2 and the powder outlet 3 come into question.
  • FIG. 1 is shown as a single-chamber Pulverdichtstrompumpe, wherein for the promotion of Be Mrsungspul- ver from the first powder reservoir 101 to the powder spray coating gun 102 or to another means for spray coating of objects or to another powder reservoir only a single powder feed chamber 4th is provided.
  • the invention is not limited to such a one-chamber
  • Pulverdichtstrompumpe trained powder seal pump limited. Rather, the teachings of the invention are also applicable to a multi-chamber powder sealant pump, such as a powder sealant pump, such as known from EP 1 551 558 A1
  • the (only) powder delivery chamber 4 has at a first end region a powder inlet 5 which points in the direction of the powder inlet 2 of the powder sealant flow pump 1. Furthermore, the powder delivery chamber 4 has a powder outlet 6 pointing in the direction of the powder outlet 3 of the powder sealant flow pump 1.
  • a powder inlet valve 7 is disposed immediately adjacent the powder inlet 5 of the powder delivery chamber 4, in such a way that this powder inlet valve 7 lies between the powder inlet 5 of the powder delivery chamber 4 and the powder inlet 2 of the powder sealant pump 1.
  • a powder outlet valve 8 is arranged immediately adjacent to the powder outlet 6 of the powder conveying chamber 4.
  • the powder outlet valve 8 is not disposed directly between the powder outlet 6 of the powder delivery chamber and the powder outlet 3 of the powder sealant flow pump 1; rather is between the Pulverauslassventil 8 and the powder outlet 3 of the powder seal current pump 1 nor an additional compressed air inlet device 9 is arranged.
  • this auxiliary compressed air inlet device 9 is used to feed additional transport compressed air as needed into the powder path between the powder outlet valve 8 and the powder outlet 3 of the powder seal current pump 1.
  • the powder inlet 2 of the powder seal stream pump 1 As in particular but the representation in FIG. 1, the powder inlet 2 of the powder seal stream pump 1, the powder inlet valve 7, the powder inlet 5 of the powder feed chamber 4, the powder feed chamber 4, the powder outlet 6 of the powder feed chamber 4, the auxiliary compressed air inlet device 9 (provided in this exemplary embodiment) and the powder outlet 3 of the powder sealant pump 1 along a common longitudinal axis.
  • exemplary embodiment of the powder seal current pump 1 according to the invention is the pulse 2 of the powder sealant pump 1 is provided at the opposite end of the powder outlet 3 of the powder sealant pump 1.
  • the powder conveying chamber 4 between its powder inlet 5 and its powder outlet 6 is formed by the cylindrical wall of a tubular filter 10, which is permeable to air, but not to coating powder and may for example consist of sintered material.
  • the filter 10 designed as a filter tube is surrounded by an intermediate chamber 11, which is bounded on its outer side by a housing 12 of the powder delivery chamber 4.
  • the powder feed chamber 4 can be supplied alternately with transport compressed air from a compressed air supply line 50 via the control valve VI or can be supplied with vacuum or negative pressure from a vacuum source 52.
  • the vacuum source 52 an injector 55, which injector compressed air from a compressed air supply line 54 and a compressed air source 58, for example via a pressure regulator 53 and another control valve V2, are supplied.
  • the powder outlet valve 8 arranged at the powder outlet 6 of the powder delivery chamber 4 is closed and that between the powder inlet 2 the powder seal pump 1 and the powder inlet 5 of the powder conveying chamber 4 arranged powder inlet valve 7 is opened.
  • the powder inlet valve 7 is closed and the powder outlet valve 8 is opened while the control valve VI is a fluid connection of the air exchange opening 13 with the compressed air supply line 50, so that the powder portion previously sucked into the powder feed chamber 4 during the suction phase is discharged through the open powder discharge valve 8 by means of the compressed air supplied through the air exchange port 13.
  • a control device 90 is provided, which is formed, for example, in FIG. 1, the valve V3 associated with the powder inlet valve 7, the valve V4 associated with the powder outlet valve 8, the valves VI and V6 associated with the powder conveying chamber 4, the valve V5 associated with the positive pressure air inlet device 9 and / or the injector 55 To control valve V2 according to a predefined or definable program sequence.
  • control device 90 is configured such that the pulse frequency of the additional compressed air inlet device 9 supplied additional compressed air in dependence on the powder dispensing frequency of the powder delivery chamber 4 is adjustable in at least one of the following ways: for example, manually adjustable and / or preferably automatically controllable or preferably controllable.
  • the additional compressed air pulse frequency can be increased with increasing Pulverabgabefrequenz and reduced with decreasing Pulverabgabefrequenz.
  • control device 90 may be formed in an advantageous manner such that means the additional compressed air quantity flowing through the additional compressed air inlet device 9 per unit of time can be set in at least one of the following ways depending on the delivered powder quantity: for example manually adjustable and / or preferably automatically controllable or preferably controllable.
  • the control device 90 of the powder seal current pump 1 or of the powder spray coating device 100 can be designed for the aforementioned setting of the additional compressed air pulse frequency or for the aforementioned setting of the additional compressed air quantity or for both settings.
  • the controller 90 may include all controls, or two or more controllers may be provided. If it is desired to set the additional compressed air pulse frequency or the additional compressed air flow rate manually, a manual adjusting element can be provided for each of these.
  • the powder inlet valve 7 and the powder outlet valve 8 of the powder seal current pump 1 according to the invention are each preferably designed as pinch valves, since less coating powder can be deposited in pinch valves than in other valve types, and because powder deposits due to the air flow in let them clean easily.
  • Pinch valves are controllable by means of compressed air or by means of negative pressure valves. In principle, however, other controllable valves are used. Furthermore, it is also possible to use instead of controllable valves automatic valves, such as ball valves or flap valves, which are controlled by the differential pressure between the valve inlet side and the Ventilauslassseite and thus automatically by the pressure and negative pressure, which prevails in the powder feed chamber 4.
  • controllable valves such as ball valves or flap valves, which are controlled by the differential pressure between the valve inlet side and the Ventilauslassseite and thus automatically by the pressure and negative pressure, which prevails in the powder feed chamber 4.
  • the already mentioned control device 90 is used, which is shown in FIG. 1 is indicated schematically.
  • the control device 90 is in particular designed to control the individual controllable components of the powder seal current pump 1, in particular the control valves VI, V2, V3, V4 and V5, suitably and to coordinate their actuation. In the in FIG.
  • Pulverdichtstrompumpe 1 and Pulversprühbe Anlagenllungsvorraum 100 is still another control valve V6 provided, via which in a cleaning cycle of the powder sealant pump 1, the powder delivery chamber 4 can be acted upon by high pressure.
  • the control device 90 is preferably designed such that it opens the control valve V4 in preparation for the suction phase of the powder delivery chamber 4, so that the compressed air provided in the pressure accumulator 57 and the compressed air source 58 via the compressed air supply line 56 and the air exchange opening 16 in the pressure chamber of the Pinch valve trained powder outlet valve 8 is passed.
  • the flexible elastic hose of the powder discharge valve 8 formed as a pinch valve is squeezed, as a result of which the powder path provided by the flexible elastic hose is closed by the powder discharge valve 8.
  • the air exchange opening 13 provided in the housing 12 of the powder delivery chamber 4 is fluidly connected to the vacuum source 52 by means of the control device 90 to generate a negative pressure in the interior of the powder delivery chamber 4, so that coating powder via the powder inlet 2 the powder seal current pump 1 and the (opened) powder inlet valve 7 and the powder inlet 5 of the powder feed chamber 4 can be sucked into the powder feed chamber 4.
  • the predetermined delay time is preferably in the range between 0 ms and 50 ms for a delivery cycle of the powder delivery chamber 4 of about 200 ms.
  • control valve V3 is fluidly connected to the compressed air supply line 56, as a result of which an overpressure is applied in the pressure chamber 15.1 of the pinch valve formed powder inlet valve 7, which causes a squeezing of the flexible elastic tube of the pinch valve formed as Pullbylassventils 7.
  • the control valve V4 switches the air exchange opening 17 of the pressure chamber of the powder outlet valve 8 designed as a pinch valve without pressure or venting the pressure chamber. Due to the elasticity of the hose of the powder outlet valve 8 designed as a pinch valve, this then passes directly into its open state.
  • control valve VI is switched such that the air exchange opening 13 formed in the housing 12 of the powder delivery chamber 4 is fluidly connected to the compressed air source 58.
  • the compressed air then flows via the compressed air supply line 50, the control valve VI, the intermediate chamber 11 and the filter element 10 into the powder feed chamber 4 and drives the previously sucked-in powder portion from the powder outlet 6 of the powder feed chamber 4.
  • control device 90 is also designed in order to introduce, via the additional compressed air inlet device 9, pulsed additional transport compressed air into the powder path between the powder outlet valve 8 and the powder outlet 3 of the powder feed in the dense-flow pump 1.
  • control device 90 is designed to always connect the air exchange opening 21 of the compressed air chamber 19 of the auxiliary compressed air inlet device 9 with the compressed air source 58 when the powder outlet valve 8 is closed.
  • the powder sealant pump 1 In order to prevent powder agglomeration and possibly congestion of the powder inlet valve 7, or at least the risk of clogging, during powder production (in the powder conveying mode of the powder seal flow pump 1), in particular also in powder types which tend to clump or blockages, during powder production (in the powder conveying mode of the powder seal flow pump 1), in particular also in powder types which tend to clump or blockages, in the exemplary embodiment of the powder sealant pump 1 according to the invention, it is provided that at least one of the following conditions is present during at least one ejection phase of a plurality of pump cycles, and preferably at the end of each ejection phase, during a predefined or definable time period:
  • condition i If during the predetermined or definable time period of the ejection phase, which is preferably at the end of the ejection phase, only the powder inlet valve is opened (condition i), a "gentle" backwash occurs due to the system back pressure and aggregation of powder particles.
  • the powder outlet valve is at least temporarily closed during the predetermined or determinable time period, the transport compressed air introduced during the ejection phase into the powder feed chamber due to the application of overpressure is diverted. This reinforces the backwashing and thus leads to an improved cleaning effect.
  • This backwashing preferably takes place at the end of each discharge phase of coating powder from the powder delivery chamber 4. Conceivable in this context, it is also that the backwashing is not at each ejection phase, but only if necessary or cyclically, in particular manually initiated takes place.
  • FIG. 2 describes an exemplary embodiment of the conveying method according to the invention, which is described, for example, with the aid of the control device 90 in the conveying method shown in FIG. 1 schematically illustrated embodiment of the powder seal current pump 1 according to the invention can be realized.
  • valve V3 assigned to the powder inlet valve 7, the valve V4 associated with the powder outlet valve 8, the valves VI and V6 associated with the powder conveying chamber 4, the valve V5 associated with the positive pressure air inlet device 9 and the valve V2 associated with the injector 55 are actuated ,
  • the flowchart shows a pump cycle consisting of a suction phase (intake half cycle) and a subsequent ejection phase (ejection half cycle).
  • the duration of the suction phase and the duration of the ejection phase are the same.
  • the suction and the ejection phase should preferably each be no longer than 250 ms.
  • the suction phase or the ejection phase amounts to a total of 100 to 250 ms, preferably a total of 120 to 200 ms, and more preferably a total of 160 to 180 ms.
  • a negative pressure in the powder delivery chamber 4 at the same time as, or preferably by a certain delay time later than Control signal for opening the arranged on the powder inlet of the powder feed chamber powder inlet valve is applied, so that the build-up of the negative pressure in the powder delivery chamber 4 at the earliest commences simultaneously with the opening of the powder inlet valve, but preferably by said predetermined delay time later than the opening of the powder inlet valve.
  • pump cycle of the powder seal flow pump cycle of the powder seal flow
  • this example does not exclude the use of other delay times and cycle times for the powder sealant pump.
  • the right side of the timing diagram according to FIG. Figure 2 shows the ejection half-cycle in an exemplary embodiment of the solution according to the invention.
  • the powder inlet valve 7 is closed until time tl and the powder outlet valve 8 is opened, while the powder feed chamber 4 is pressurized and transport compressed air is fed into the powder feed chamber 4.
  • the powder inlet valve 7 is opened, the powder outlet valve 8 is closed and the pressurization of the powder conveying chamber 4 is interrupted (the supply of transport compressed air). In this way, it is achieved that, at the end of the ejection phase, a cleaning of the suction region of the powder sealant body takes place.
  • the actuation of the powder inlet valve 7 and the powder outlet valve 8 causes no or only a very small amount of powder to settle in the suction region of the powder sealant flow pump 1 can, as given by the valve actuation and a pulse to the powder and thus an accumulation and aggregation of powder particles is effectively prevented.
  • the powder inlet valve 7 is opened at the same time, the powder outlet valve 8 is closed and the pressurization of the powder delivery chamber 4 is interrupted with overpressure, this is not to be understood as a restriction.
  • At least one of said conditions is initiated with a maximum of 50 ms and preferably not more than 30 ms before the end of the ejection half-cycle.
  • the invention is not limited to the exemplary embodiments shown schematically in the figures, but results from a synopsis of all the features disclosed herein.

Landscapes

  • Application Of Or Painting With Fluid Materials (AREA)
  • Coating Apparatus (AREA)
  • Nozzles (AREA)
  • Air Transport Of Granular Materials (AREA)

Abstract

L'invention concerne une pompe (1) à poudre en phase dense et un procédé pour le fonctionnement d'une pompe (1) à poudre en phase dense dans un mode de transport de poudre. Pour éviter ou du moins réduire de manière simple des accumulations de poudre et des bouchages par la poudre, en particulier au niveau du côté entrée de poudre de la chambre (4) de transport de poudre de la pompe (1) en phase dense et ici au niveau de la soupape (7) d'admission de la poudre, selon l'invention, pendant un laps de temps pouvant être fixé ou fixé au préalable dans au moins une phase d'expulsion et, de préférence, à la fin dans le temps de la phase d'expulsion d'un cycle de poudre, au moins une des conditions suivantes existe : i) la soupape (7) d'admission de poudre de la pompe (1) à poudre en phase dense est ouverte ; ii) la soupape (8) de sortie de poudre de la pompe (1) à poudre en phase dense est fermée ; et/ou iii) la sollicitation de la chambre (4) de transport de poudre de la pompe (1) à poudre en phase dense par une pression positive est interrompue.
EP16723962.3A 2015-05-29 2016-05-03 Procédé de fonctionnement d'une pompe à poudre en phase dense et pompe à poudre en phase dense Active EP3302819B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015108492.9A DE102015108492A1 (de) 2015-05-29 2015-05-29 Verfahren zum Betreiben einer Pulverdichtstrompumpe sowie Pulverdichtstrompumpe
PCT/EP2016/059907 WO2016192915A1 (fr) 2015-05-29 2016-05-03 Procédé pour le fonctionnement d'une pompe à poudre en phase dense ainsi que pompe à poudre en phase dense

Publications (2)

Publication Number Publication Date
EP3302819A1 true EP3302819A1 (fr) 2018-04-11
EP3302819B1 EP3302819B1 (fr) 2020-07-08

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PL3685924T3 (pl) * 2019-01-25 2022-04-19 Wagner International Ag Urządzenie przenoszące proszek do proszku powlekającego i instalacja do powlekania proszkowego z urządzeniem przenoszącym proszek
JP7274356B2 (ja) * 2019-06-11 2023-05-16 東京エレクトロン株式会社 液処理装置、液処理方法及び記憶媒体
DK181404B1 (en) * 2022-01-03 2023-10-17 Nel Hydrogen As Compressor with reduced start-up torque

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BR112017025101A2 (pt) 2018-08-07
EP3302819B1 (fr) 2020-07-08
DE102015108492A1 (de) 2016-12-01
US10835907B2 (en) 2020-11-17
WO2016192915A1 (fr) 2016-12-08
BR112017025101B1 (pt) 2021-10-05
CN107683178A (zh) 2018-02-09
US20180147585A1 (en) 2018-05-31

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