EP1574261B1 - Powder pump - Google Patents

Powder pump Download PDF

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Publication number
EP1574261B1
EP1574261B1 EP05004575A EP05004575A EP1574261B1 EP 1574261 B1 EP1574261 B1 EP 1574261B1 EP 05004575 A EP05004575 A EP 05004575A EP 05004575 A EP05004575 A EP 05004575A EP 1574261 B1 EP1574261 B1 EP 1574261B1
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EP
European Patent Office
Prior art keywords
powder
piston
working space
space
powder pump
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Not-in-force
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EP05004575A
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German (de)
French (fr)
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EP1574261A2 (en
EP1574261A3 (en
Inventor
Frank Herre
Hans-Georg Fritz
Thomas Dürr
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Duerr Systems AG
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Duerr Systems AG
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Publication of EP1574261A2 publication Critical patent/EP1574261A2/en
Publication of EP1574261A3 publication Critical patent/EP1574261A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B05B7/1459—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

Definitions

  • the invention relates to a powder feed pump, in particular for a powder coating device, according to the preamble of claim 1.
  • Such a powder feed pump is known, which can be used in a coating agent plant to promote the serving as a coating powder powder.
  • This known powder feed pump has a piston which is driven mechanically via a piston rod and which generates a vacuum in a working chamber of the powder feed pump during an upward movement, whereby the powder is sucked into the working space of the powder feed pump via a powder inlet. Subsequently, conveying air is then blown into the working space, whereby the powder located in the working space is discharged via a powder outlet.
  • a disadvantage of this known powder feed pump is the complex mechanical drive, which takes place via a piston rod by pneumatic cylinder.
  • EP 0 124 933 A EP 1 106 547 A1 and US 5 203 507 A .
  • the invention is therefore based on the object to simplify the drive in the known powder feed pump described above.
  • the invention comprises the general technical teaching of pneumatically driving the piston directly, so that a piston rod for mechanically connecting the piston to the drive unit (for example pneumatic cylinder) can be dispensed with.
  • a piston rod for mechanically connecting the piston to the drive unit for example pneumatic cylinder
  • Another advantage of the drive according to the invention is that the number and mass of the moving parts is smaller, whereby the susceptibility to wear is reduced and the vibrations are reduced.
  • a control chamber is provided for the pneumatic drive of the piston, wherein the piston forms a boundary surface of the control chamber.
  • the pressure in the control chamber is hereby adjustable in order to exert a corresponding pressure on the piston and to move it accordingly.
  • control chamber and the working space of the powder feed pump are arranged here on opposite sides of the piston, wherein the piston separates the control chamber from the working space.
  • An increase in pressure in the control chamber thus causes a downward movement of the piston and a corresponding reduction of the working space volume, whereas a pressure reduction in the control chamber causes an upward movement of the piston and leads to a corresponding increase in the working space volume.
  • control chamber and the working space are arranged on the same side of the piston, so that the control chamber and the working space preferably act on the same end face of the piston.
  • the piston thus has two axially projecting on one side and coaxially arranged partial pistons, between which an annular groove extends, in which engages the cylindrical wall between the working space and the control chamber.
  • the arrangement of the working space on the outside of the control chamber is advantageous because this results in a larger working volume, resulting in a correspondingly larger flow rate.
  • the control chamber surrounds the working space in an annular manner.
  • an overpressure port can open into the control chamber (s) in order to generate an overpressure in the control chamber and to move the piston accordingly, whereby the working volume of the chamber is correspondingly changed.
  • the control chamber is arranged on the opposite side of the working space of the piston, so an increase in pressure in the control chamber leads to a downward movement of the piston and a corresponding reduction of the working space volume.
  • the control room is located on the same side as the working space, an increase in pressure in the control space through the overpressure connection will result in an upward movement of the piston and a corresponding increase in the working space volume.
  • a negative pressure port may open into the control space (s) to reduce the pressure in the control space, resulting in a corresponding piston movement and a change in working volume.
  • a reduction of the pressure in the control chamber leads to an upward movement of the piston and a corresponding increase in the working space volume.
  • a pressure reduction in the control space leads to a downward movement of the piston and a corresponding reduction of the work space volume.
  • the pneumatic control of the piston can be carried out in the context of the invention exclusively by an overpressure generation on the two sides of the piston.
  • the pneumatic control of the piston takes place exclusively by generating a negative pressure on the opposite sides of the piston.
  • the piston movement serves only to draw the powder into the working space, whereas the ejection of the powder from the working space through the powder outlet is not effected by the piston.
  • a conveying air connection is preferably provided which opens into the working space to blow conveying air into the working space and to eject the powder located in the working space and previously sucked in through the powder outlet.
  • the conveying air connection and the powder outlet are arranged opposite one another in the working space. This offers the advantage that the flow path from the conveying air connection to the powder outlet supports the ejection of the powder.
  • a vacuum connection can also open into the working space in order to move the piston out of the working space after the ejection of the powder and to correspondingly change the working space volume.
  • the piston after ejection of the powder, the piston must first be moved down again (i.e., in the direction of the working space) in order to reduce the work space volume so that subsequently powder can again be sucked into the working space.
  • the upward or downward movement of the piston can also be assisted or effected by a spring, whereby the spring can selectively push or pull the piston.
  • the piston can therefore be connected to a compression or tension spring, which moves the piston to an initial position when no external pneumatic pressure acts.
  • the spring may move the plunger upwardly (i.e., toward the control chamber) to draw in the powder, whereas the subsequent downward movement of the plunger is exclusively pneumatically driven.
  • At least one stop is arranged in the working space and / or in the control space, which limits the piston movement, in order to achieve a defined displacement and thereby achieve a predetermined flow rate.
  • the piston consists of an elastic material in order to achieve the best possible sealing effect between the piston and the surrounding running surface.
  • the piston may consist of a plastic, which applies elastically to the tread. This is also advantageous because plastic is relatively light, so that lower mass forces occur in the oscillating operation of the piston, whereby the vibrations are reduced.
  • the piston may have on its lateral surface an integrally formed sealing lip to strip powder residues on the tread without a separate piston ring.
  • the piston can therefore be constructed like a pig, which is used in modern coating systems for cleaning paint lines.
  • the invention is not limited to the powder feed pump according to the invention described above as a single component, but also comprises a complete powder coating system with such a powder feed pump.
  • the invention also encompasses the novel use of such a powder feed pump for conveying powder in a powder coating system.
  • FIG. 1 shows a powder feed pump 1, which can be used in a powder coating plant to promote a serving as a coating powder 2 from a powder container 3 to serving as an application device rotary atomizer 4.
  • the powder container 3 and the rotary atomizer 4 may in this case be of conventional design, so that a detailed description of the powder container 3 and the rotary atomizer 4 can be dispensed with in the following and reference is made in this regard to the relevant specialist literature.
  • the powder feed pump 1 has a working chamber 5 with a variable working volume, wherein in the working space 5, a powder inlet 6 opens, which is connected via a supply line 7 and a powder inlet valve 8 with the powder container 3. With open powder inlet valve 8, the Powder 2 so be sucked via the supply line 7 and the powder inlet 6 in the working space 5 of the powder feed pump 1.
  • a powder outlet 9 opens into the working space 5 of the powder feed pump 1, the powder outlet 9 being connected to the rotary atomizer 4 via a discharge line 10 and a powder outlet valve 11.
  • the powder outlet valve 11 When the powder outlet valve 11 is open, therefore, the powder 2 sucked into the working space 5 of the powder feed pump 1 can be ejected via the powder outlet 9 and conveyed to the rotary atomizer 4.
  • the working space volume of the working space 5 can be changed by a piston 12, which is arranged displaceably in the direction of the arrow in the powder feed pump 1.
  • the piston 12 is made of an elastic plastic and has on its lateral surface 2 axially spaced sealing lips 13, the powder remnants of an associated tread 14 strip.
  • the powder feed pump 1 has a control chamber 15 which is arranged on the opposite side of the working chamber 5 of the piston 12. In the control chamber 15 opens a port 16 which is connected via a pressure relief line 17 and a pressure relief valve 18 with a pressure source.
  • the port 16 is connected via a vacuum line 19 and a vacuum valve 20 to a vacuum source, which is not shown as well as the overpressure source for simplicity. Via the port 16, the pressure in the control chamber 15 can be adjusted to control the movement of the piston 12. For downward movement of the piston 12, the pressure relief valve 18 is opened, while the vacuum valve 20 is closed, whereby the pressure in the control chamber 15 increases accordingly and the piston 12 moves downward.
  • a port 21 which is connected via a conveying air valve 22 with a conveying air source.
  • conveying air is blown into the working space 5 of the powder feed pump 1 via the connection 21, whereby the powder 2 located in the working space 5 is expelled via the powder outlet 9 if the powder outlet valve 11 is opened.
  • a vacuum connection can be connected to the connection 21 via a vacuum valve 23 in order to generate a negative pressure in the working space 5 and thereby pull the piston 12 downwards.
  • this vacuum control of the piston 12 is only optional and will therefore not be further described.
  • the powder feed pump 1 has a protruding into the control chamber 15 stop 24 and a projecting into the working space 5 stop 25, wherein the two stops 24, 25 limit the piston movement and thereby set a defined maximum displacement.
  • the powder inlet valve 8 and the vacuum valve 20 are then opened, whereby air is sucked out of the control chamber 15, resulting in a corresponding pressure reduction in the control chamber 15 and an upward movement of the piston 12.
  • the upward movement of the piston 12 in turn leads to a reduction in pressure in the working space 5, whereby the powder 2 is sucked out of the powder container 3 via the powder inlet 6 into the working space 5.
  • the conveying air valve 22 is then closed while the powder outlet valve 11 is still open, while the pressure relief valve 18 is opened.
  • the piston 12 moves down until the piston 12 finally abuts against the stop 25, whereupon the pressure relief valve 18 is closed, so that the power stroke is completed.
  • FIG. 2 illustrated embodiment is largely consistent with that described above and in FIG. 1 illustrated embodiment, so to avoid repetition, reference is made largely to the above description and the same reference numerals are used for corresponding components.
  • a special feature of this embodiment is that the piston 12 on the control chamber 15 side facing is connected to two tension springs 26 which are fixed to the housing of the powder feed pump 1.
  • the two tension springs 26 support the upward movement of the piston 12 when sucking the powder 2 in the working space 5 and take over the upward movement instead of the vacuum.
  • FIG. 3 a further embodiment, which also largely with the above-described and in FIG. 1 illustrated embodiment, so that to avoid repetition largely to the above description FIG. 1 is referenced and the same reference numerals are used for corresponding components.
  • the powder feed pump 1 has two control chambers 15.1, 15.2 for the pneumatic drive of the piston 12, wherein the control chamber 15.1 is arranged on the side facing away from the working chamber 5 of the piston 12, while the control chamber 15.2 on the same side of the Piston 12 is like the working space. 5
  • the control chamber 15.1 can in this case be controlled in the same way as the control chamber 15 in FIG. 1 , so that reference is made in this regard to the above description.
  • control chamber 15.2 is separated by a cup-shaped, cylindrical wall 27 of the working space 5, wherein the working space 5 surrounds the control chamber 15.2 annular.
  • annular groove 28 into which the wall 27 engages.
  • the upward movement of the piston 12 is in this case initiated by 30 compressed air is injected into the control chamber 15.2 via a port 29 and a pressure relief valve, whereby the piston 12 moves upward and thereby sucks the powder 2 via the powder inlet 6 into the working space 5.
  • An advantage of this embodiment is the fact that the upward movement of the piston 12 for sucking the powder 2 in the working space 5 can be done with a considerably larger force, since in the control chamber 15.2 can easily generate a strong overpressure, whereas the differential pressure during the suction of the Piston according to FIG. 1 is limited to a maximum of 1 bar.

Landscapes

  • Reciprocating Pumps (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Air Transport Of Granular Materials (AREA)
  • Coating Apparatus (AREA)

Abstract

The pump (1) for applying powder has a working space (5)with adjustable volume, a powder inlet (6) abutting into the space to intake powder(2), and a powder outlet (9) flowing out of the space to force out the powder in the workspace. It has a moveable piston (12) with one surface adjacent to the workspace which sucks the powder through the powder intake into the workspace using an upwards motion. The piston is pneumatically powered, a control space (15) is created on the other side of the piston from the working space to drive the pump .

Description

Die Erfindung betrifft eine Pulverförderpumpe, insbesondere für eine Pulverbeschichtungseinrichtung, gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a powder feed pump, in particular for a powder coating device, according to the preamble of claim 1.

Aus DE 101 45 448 A1 sowie aus WO 03/024613 A1 ist eine derartige Pulverförderpumpe bekannt, die in einer Beschichtungsmittelanlage eingesetzt werden kann, um das als Beschichtungsmittel dienende Pulver zu fördern. Diese bekannte Pulverförderpumpe weist einen mechanisch über eine Kolbenstange angetriebenen Hubkolben auf, der bei einer Aufwärtsbewegung ein Vakuum in einem Arbeitsraum der Pulverförderpumpe erzeugt, wodurch das Pulver über einen Pulvereinlass in den Arbeitsraum der Pulverförderpumpe eingesaugt wird. Anschließend wird dann Förderluft in den Arbeitsraum eingeblasen, wodurch das in dem Arbeitsraum befindliche Pulver über einen Pulverauslass ausgestoßen wird.Out DE 101 45 448 A1 as well as out WO 03/024613 A1 Such a powder feed pump is known, which can be used in a coating agent plant to promote the serving as a coating powder powder. This known powder feed pump has a piston which is driven mechanically via a piston rod and which generates a vacuum in a working chamber of the powder feed pump during an upward movement, whereby the powder is sucked into the working space of the powder feed pump via a powder inlet. Subsequently, conveying air is then blown into the working space, whereby the powder located in the working space is discharged via a powder outlet.

Nachteilig an dieser bekannten Pulverförderpumpe ist der aufwendige mechanische Antrieb, der über eine Kolbenstange durch Pneumatikzylinder erfolgt.A disadvantage of this known powder feed pump is the complex mechanical drive, which takes place via a piston rod by pneumatic cylinder.

Zum allgemeinen technischen Hintergrund ist ferner hinzuweisen auf EP 0 124 933 A , EP 1 106 547 A1 und US 5 203 507 A .The general technical background should also be noted EP 0 124 933 A . EP 1 106 547 A1 and US 5 203 507 A ,

Der Erfindung liegt deshalb die Aufgabe zugrunde, bei der vorstehend beschriebenen bekannten Pulverförderpumpe den Antrieb zu vereinfachen.The invention is therefore based on the object to simplify the drive in the known powder feed pump described above.

Diese Aufgabe wird, ausgehend von der vorstehend beschriebenen bekannten Pulverförderpumpe gemäß dem Oberbegriff des Anspruchs 1, durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst.This object is, starting from the known powder feed pump described above according to the preamble of the claim 1, solved by the characterizing features of claim 1.

Die Erfindung umfasst die allgemeine technische Lehre, den Kolben pneumatisch direkt anzutreiben, so dass auf eine Kolbenstange zur mechanischen Verbindung des Kolbens mit der Antriebseinheit (z.B. Pneumatikzylinder) verzichtet werden kann. Ein weiterer Vorteil des erfindungsgemäßen Antriebs besteht darin, dass die Zahl und die Masse der bewegten Teile kleiner ist, wodurch die Verschleißanfälligkeit verringert und die Vibrationen gemindert werden.The invention comprises the general technical teaching of pneumatically driving the piston directly, so that a piston rod for mechanically connecting the piston to the drive unit (for example pneumatic cylinder) can be dispensed with. Another advantage of the drive according to the invention is that the number and mass of the moving parts is smaller, whereby the susceptibility to wear is reduced and the vibrations are reduced.

Vorzugsweise ist zum pneumatischen Antrieb des Kolbens ein Steuerraum vorgesehen, wobei der Kolben eine Begrenzungsfläche des Steuerraums bildet. Der Druck in dem Steuerraum ist hierbei einstellbar, um einen entsprechenden Druck auf den Kolben auszuüben und diesen entsprechend zu bewegen.Preferably, a control chamber is provided for the pneumatic drive of the piston, wherein the piston forms a boundary surface of the control chamber. The pressure in the control chamber is hereby adjustable in order to exert a corresponding pressure on the piston and to move it accordingly.

In einem Ausführungsbeispiel der Erfindung sind der Steuerraum und der Arbeitsraum der Pulverförderpumpe hierbei auf gegenüberliegenden Seiten des Kolbens angeordnet, wobei der Kolben den Steuerraum von dem Arbeitsraum trennt. Eine Druckerhöhung in dem Steuerraum bewirkt hierbei also eine Abwärtsbewegung des Kolbens und eine entsprechende Verringerung des Arbeitsraumvolumens, wohingegen eine Druckverringerung in dem Steuerraum eine Aufwärtsbewegung des Kolbens bewirkt und zu einer entsprechenden Vergrößerung des Arbeitsraumvolumens führt.In one embodiment of the invention, the control chamber and the working space of the powder feed pump are arranged here on opposite sides of the piston, wherein the piston separates the control chamber from the working space. An increase in pressure in the control chamber thus causes a downward movement of the piston and a corresponding reduction of the working space volume, whereas a pressure reduction in the control chamber causes an upward movement of the piston and leads to a corresponding increase in the working space volume.

In einem anderen Ausführungsbeispiel der Erfindung sind der Steuerraum und der Arbeitsraum dagegen auf derselben Seite des Kolbens angeordnet, so dass der Steuerraum und der Arbeitsraum vorzugsweise auf dieselbe Stirnfläche des Kolbens wirken. Beispielsweise kann der Arbeitsraum den Steuerraum ringförmig umgeben, wobei der Steuerraum durch eine zylindrische Wandung von dem Arbeitsraum getrennt ist. Der Kolben weist hierbei also auf einer Seite zwei axial hervorstehende und koaxial angeordnete Teilkolben auf, zwischen denen eine ringförmige Nut verläuft, in die die zylindrische Wandung zwischen dem Arbeitsraum und dem Steuerraum eingreift. Die Anordnung des Arbeitsraumes an der Außenseite des Steuerraumes ist vorteilhaft, weil sich dadurch ein größeres Arbeitsraumvolumen ergibt, was zu einer entsprechend größeren Fördermenge führt. Es ist jedoch bei diesem Ausführungsbeispiel alternativ auch möglich, dass der Steuerraum den Arbeitsraum ringförmig umgibt.In another embodiment of the invention, however, the control chamber and the working space are arranged on the same side of the piston, so that the control chamber and the working space preferably act on the same end face of the piston. For example, the working space surrounding the control chamber annular, wherein the control chamber is separated by a cylindrical wall of the working space. The piston thus has two axially projecting on one side and coaxially arranged partial pistons, between which an annular groove extends, in which engages the cylindrical wall between the working space and the control chamber. The arrangement of the working space on the outside of the control chamber is advantageous because this results in a larger working volume, resulting in a correspondingly larger flow rate. However, it is alternatively also possible in this embodiment that the control chamber surrounds the working space in an annular manner.

Darüber hinaus besteht bei diesem Ausführungsbeispiel die Möglichkeit, dass auf beiden Seiten des Kolbens jeweils ein Steuerraum angeordnet ist, um den Kolben pneumatisch direkt anzutreiben, wobei die beiden Steuerräume auf die gegenüberliegenden Stirnflächen des Kolbens wirken.In addition, in this embodiment there is the possibility that on both sides of the piston in each case a control chamber is arranged to pneumatically directly drive the piston, wherein the two control chambers act on the opposite end faces of the piston.

Zum pneumatischen Antrieb kann in den oder die Steuerräume ein Überdruckanschluss münden, um einen Überdruck in dem Steuerraum zu erzeugen und den Kolben entsprechend zu bewegen, wodurch das Arbeitsraumvolumen entsprechend verändert wird. Falls der Steuerraum auf der dem Arbeitsraum gegenüberliegenden Seite des Kolbens angeordnet ist, so führt eine Druckerhöhung in den Steuerraum zu einer Abwärtsbewegung des Kolbens und einer entsprechenden Verringerung des Arbeitsraumvolumens. Falls sich der Steuerraum dagegen auf derselben Seite befindet, wie der Arbeitsraum, so führt eine Druckerhöhung in dem Steuerraum durch den Überdruckanschluss zu einer Aufwärtsbewegung des Kolbens und einer entsprechenden Vergrößerung des Arbeitsraumvolumens.For the pneumatic drive, an overpressure port can open into the control chamber (s) in order to generate an overpressure in the control chamber and to move the piston accordingly, whereby the working volume of the chamber is correspondingly changed. If the control chamber is arranged on the opposite side of the working space of the piston, so an increase in pressure in the control chamber leads to a downward movement of the piston and a corresponding reduction of the working space volume. If, on the other hand, the control room is located on the same side as the working space, an increase in pressure in the control space through the overpressure connection will result in an upward movement of the piston and a corresponding increase in the working space volume.

Darüber hinaus kann in den oder die Steuerräume ein Unterdruckanschluss münden, um den Druck in dem Steuerraum zu verringern, was zu einer entsprechenden Kolbenbewegung und einer Veränderung des Arbeitsraumvolumens führt. Bei einer Anordnung des Steuerraums auf der dem Arbeitsraum gegenüberliegenden Seite führt eine Verringerung des Drucks in dem Steuerraum zu einer Aufwärtsbewegung des Kolbens und einer entsprechenden Vergrößerung des Arbeitsraumvolumens. Bei einer Anordnung des Steuerraums auf derselben Seite wie der Arbeitsraum führt eine Druckverringerung in dem Steuerraum dagegen zu einer Abwärtsbewegung des Kolbens und einer entsprechenden Verringerung des Arbeitsraumvolumens.In addition, a negative pressure port may open into the control space (s) to reduce the pressure in the control space, resulting in a corresponding piston movement and a change in working volume. In an arrangement the control chamber on the opposite side of the working space, a reduction of the pressure in the control chamber leads to an upward movement of the piston and a corresponding increase in the working space volume. By contrast, with an arrangement of the control space on the same side as the working space, a pressure reduction in the control space leads to a downward movement of the piston and a corresponding reduction of the work space volume.

Die pneumatische Steuerung des Kolbens kann im Rahmen der Erfindung ausschließlich durch eine Überdruckerzeugung auf den beiden Seiten des Kolbens erfolgen. Es ist jedoch alternativ auch möglich, das die pneumatische Steuerung des Kolbens ausschließlich durch eine Unterdruckerzeugung auf den gegenüberliegenden Seiten des Kolbens erfolgt. Darüber hinaus besteht auch die Möglichkeit einer Kombination einer Unterdruckerzeugung mit einer Überdruckerzeugung, wobei Unterdruck und Überdruck vorzugsweise auf derselben Seite des Kolbens erzeugt werden, um den Kolben entsprechend zu bewegen.The pneumatic control of the piston can be carried out in the context of the invention exclusively by an overpressure generation on the two sides of the piston. However, it is alternatively also possible that the pneumatic control of the piston takes place exclusively by generating a negative pressure on the opposite sides of the piston. In addition, there is also the possibility of combining a vacuum generation with a positive pressure generation, wherein negative pressure and pressure are preferably generated on the same side of the piston in order to move the piston accordingly.

In dem bevorzugten Ausführungsbeispiel der Erfindung dient die Kolbenbewegung nur zum Einsaugen des Pulvers in den Arbeitsraum, wohingegen das Ausstoßen des Pulvers aus dem Arbeitsraum durch den Pulverauslass nicht durch den Kolben erfolgt. Hierzu ist vorzugsweise ein Förderluftanschluss vorgesehen, der in den Arbeitsraum mündet, um Förderluft in den Arbeitsraum einzublasen und das in dem Arbeitsraum befindliche und zuvor eingesaugte Pulver durch den Pulverauslass auszustoßen.In the preferred embodiment of the invention, the piston movement serves only to draw the powder into the working space, whereas the ejection of the powder from the working space through the powder outlet is not effected by the piston. For this purpose, a conveying air connection is preferably provided which opens into the working space to blow conveying air into the working space and to eject the powder located in the working space and previously sucked in through the powder outlet.

Vorzugsweise sind der Förderluftanschluss und der Pulverauslass in dem Arbeitsraum einander gegenüberliegend angeordnet. Dies bietet den Vorteil, dass der Strömungsverlauf vom Förderluftanschluss zum Pulverauslass das Ausstoßen des Pulvers unterstützt.Preferably, the conveying air connection and the powder outlet are arranged opposite one another in the working space. This offers the advantage that the flow path from the conveying air connection to the powder outlet supports the ejection of the powder.

Darüber hinaus kann in den Arbeitsraum auch ein Unterdruckanschluss münden, um den Kolben nach dem Ausstoßen des Pulvers aus dem Arbeitsraum zu bewegen und das Arbeitsraumvolumen entsprechend zu verändern. So muss der Kolben nach dem Ausstoßen des Pulvers zunächst wieder abwärts (d.h. in Richtung des Arbeitsraums) bewegt werden, um das Arbeitsraumvolumen zu verringern, damit anschließend erneut Pulver in den Arbeitsraum eingesaugt werden kann.In addition, a vacuum connection can also open into the working space in order to move the piston out of the working space after the ejection of the powder and to correspondingly change the working space volume. Thus, after ejection of the powder, the piston must first be moved down again (i.e., in the direction of the working space) in order to reduce the work space volume so that subsequently powder can again be sucked into the working space.

Die Aufwärts- oder Abwärtsbewegung des Kolbens kann auch durch eine Feder unterstützt oder bewirkt werden, wobei die Feder den Kolben wahlweise drücken oder ziehen kann. Der Kolben kann also mit einer Druck- oder Zugfeder verbunden sein, die den Kolben in eine Ausgangsstellung bewegt, wenn kein äußerer pneumatischer Druck wirkt. Beispielsweise kann die Feder den Kolben zum Einsaugen des Pulvers nach oben (d.h. in Richtung des Steuerraums) bewegen, wohingegen die anschließende Abwärtsbewegung des Kolbens ausschließlich pneumatisch angetrieben wird.The upward or downward movement of the piston can also be assisted or effected by a spring, whereby the spring can selectively push or pull the piston. The piston can therefore be connected to a compression or tension spring, which moves the piston to an initial position when no external pneumatic pressure acts. For example, the spring may move the plunger upwardly (i.e., toward the control chamber) to draw in the powder, whereas the subsequent downward movement of the plunger is exclusively pneumatically driven.

Weiterhin ist es vorteilhaft, wenn in dem Arbeitsraum und/oder in dem Steuerraum mindestens ein Anschlag angeordnet ist, der die Kolbenbewegung begrenzt, um ein definiertes Hubvolumen zu erreichen und dadurch eine vorgegebene Fördermenge zu erzielen.Furthermore, it is advantageous if at least one stop is arranged in the working space and / or in the control space, which limits the piston movement, in order to achieve a defined displacement and thereby achieve a predetermined flow rate.

Ferner ist es vorteilhaft, wenn der Kolben aus einem elastischen Material besteht, um eine möglichst gute Dichtwirkung zwischen dem Kolben und der umgebenden Lauffläche zu erreichen.Furthermore, it is advantageous if the piston consists of an elastic material in order to achieve the best possible sealing effect between the piston and the surrounding running surface.

Beispielsweise kann der Kolben aus einem Kunststoff bestehen, der sich elastisch an die Lauffläche anlegt. Dies ist auch vorteilhaft, weil Kunststoff relativ leicht ist, so dass im oszillierenden Betrieb des Kolbens geringere Massenkräfte auftreten, wodurch die Vibrationen herabgesetzt werden.For example, the piston may consist of a plastic, which applies elastically to the tread. This is also advantageous because plastic is relatively light, so that lower mass forces occur in the oscillating operation of the piston, whereby the vibrations are reduced.

Ferner kann der Kolben an seiner Mantelfläche eine einstückig angeformte Dichtlippe aufweisen, um Pulverreste an der Lauffläche ohne einen separaten Kolbenring abzustreifen. Der Kolben kann also wie ein Molch aufgebaut sein, der in modernen Beschichtungsanlagen zur Reinigung von Farbleitungen eingesetzt wird.Further, the piston may have on its lateral surface an integrally formed sealing lip to strip powder residues on the tread without a separate piston ring. The piston can therefore be constructed like a pig, which is used in modern coating systems for cleaning paint lines.

Ferner ist zu erwähnen, dass die Erfindung nicht auf die vorstehend beschriebene erfindungsgemäße Pulverförderpumpe als einzelnes Bauteil beschränkt ist, sondern auch eine vollständige Pulverbeschichtungsanlage mit einer derartigen Pulverförderpumpe umfasst.It should also be noted that the invention is not limited to the powder feed pump according to the invention described above as a single component, but also comprises a complete powder coating system with such a powder feed pump.

Darüber hinaus umfasst die Erfindung auch die neuartige Verwendung einer derartigen Pulverförderpumpe zur Pulverförderung in einer Pulverbeschichtungsanlage.In addition, the invention also encompasses the novel use of such a powder feed pump for conveying powder in a powder coating system.

Andere vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet oder werden nachstehend zusammen mit der Beschreibung der bevorzugten Ausführungsbeispiele der Erfindung anhand der Figuren näher erläutert. Es zeigen:

Figur 1
eine schematische Darstellung einer erfindungsgemäßen Pulverförderpumpe zur Förderung von Pulver in einer Pulverbeschichtungsanlage,
Figur 2
eine Abwandlung der Pulverförderpumpe aus Figur 1 mit Federn zur Unterstützung der Kolbenbewegung sowie
Figur 3
ein weiteres Ausführungsbeispiel einer erfindungsgemäßen Pulverförderpumpe.
Other advantageous developments of the invention are characterized in the subclaims or are explained in more detail below together with the description of the preferred embodiments of the invention with reference to FIGS. Show it:
FIG. 1
a schematic representation of a powder feed pump according to the invention for the promotion of powder in a powder coating plant,
FIG. 2
a modification of the powder feed pump FIG. 1 with springs in support of the piston movement as well
FIG. 3
a further embodiment of a powder feed pump according to the invention.

Die schematische Darstellung in Figur 1 zeigt eine Pulverförderpumpe 1, die in einer Pulverbeschichtungsanlage eingesetzt werden kann, um ein als Beschichtungsmittel dienendes Pulver 2 aus einem Pulverbehälter 3 zu einem als Applikationsgerät dienenden Rotationszerstäuber 4 zu fördern.The schematic representation in FIG. 1 shows a powder feed pump 1, which can be used in a powder coating plant to promote a serving as a coating powder 2 from a powder container 3 to serving as an application device rotary atomizer 4.

Der Pulverbehälter 3 und der Rotationszerstäuber 4 können hierbei herkömmlich ausgebildet sein, so dass im Folgenden auf eine detaillierte Beschreibung des Pulverbehälters 3 und des Rotationszerstäubers 4 verzichtet werden kann und diesbezüglich auf die einschlägige Fachliteratur verwiesen wird.The powder container 3 and the rotary atomizer 4 may in this case be of conventional design, so that a detailed description of the powder container 3 and the rotary atomizer 4 can be dispensed with in the following and reference is made in this regard to the relevant specialist literature.

Weiterhin kann anstelle des Rotationszerstäubers 4 auch ein anderes Applikationsgerät verwendet werden, wie beispielsweise eine Pulversprühpistole.Furthermore, instead of the rotary atomizer 4, another application device can be used, such as a powder spray gun.

Ferner können zwischen dem Pulverbehälter 3 und der Pulverförderpumpe 1 sowie zwischen der Pulverförderpumpe 1 und dem Rotationszerstäuber 4 weitere Bauteile und Komponenten angeordnet sein, die jedoch hier zur Vereinfachung nicht dargestellt sind.Further, between the powder container 3 and the powder feed pump 1 and between the powder feed pump 1 and the rotary atomizer 4 further components and components may be arranged, which are not shown here for simplicity.

Die Pulverförderpumpe 1 weist einen Arbeitsraum 5 mit einem veränderlichen Arbeitsraumvolumen auf, wobei in den Arbeitsraum 5 ein Pulvereinlass 6 mündet, der über eine Zuleitung 7 und ein Pulvereinlassventil 8 mit dem Pulverbehälter 3 verbunden ist. Bei geöffnetem Pulvereinlassventil 8 kann das Pulver 2 also über die Zuleitung 7 und den Pulvereinlass 6 in den Arbeitsraum 5 der Pulverförderpumpe 1 eingesaugt werden.The powder feed pump 1 has a working chamber 5 with a variable working volume, wherein in the working space 5, a powder inlet 6 opens, which is connected via a supply line 7 and a powder inlet valve 8 with the powder container 3. With open powder inlet valve 8, the Powder 2 so be sucked via the supply line 7 and the powder inlet 6 in the working space 5 of the powder feed pump 1.

Weiterhin mündet ein Pulverauslass 9 in den Arbeitsraum 5 der Pulverförderpumpe 1, wobei der Pulverauslass 9 über eine Austragsleitung 10 und ein Pulverauslassventil 11 mit dem Rotationszerstäuber 4 verbunden ist. Bei geöffnetem Pulverauslassventil 11 kann also das in den Arbeitsraum 5 der Pulverförderpumpe 1 eingesaugte Pulver 2 über den Pulverauslass 9 ausgestoßen und zu dem Rotationszerstäuber 4 gefördert werden.Furthermore, a powder outlet 9 opens into the working space 5 of the powder feed pump 1, the powder outlet 9 being connected to the rotary atomizer 4 via a discharge line 10 and a powder outlet valve 11. When the powder outlet valve 11 is open, therefore, the powder 2 sucked into the working space 5 of the powder feed pump 1 can be ejected via the powder outlet 9 and conveyed to the rotary atomizer 4.

Das Arbeitsraumvolumen des Arbeitsraums 5 ist durch einen Kolben 12 veränderbar, der in Pfeilrichtung verschiebbar in der Pulverförderpumpe 1 angeordnet ist.The working space volume of the working space 5 can be changed by a piston 12, which is arranged displaceably in the direction of the arrow in the powder feed pump 1.

Der Kolben 12 besteht aus einem elastischen Kunststoff und weist an seiner Mantelfläche 2 axial beabstandete Dichtlippen 13 auf, die Pulverreste von einer zugehörigen Lauffläche 14 abstreifen.The piston 12 is made of an elastic plastic and has on its lateral surface 2 axially spaced sealing lips 13, the powder remnants of an associated tread 14 strip.

Weiterhin weist die Pulverförderpumpe 1 einen Steuerraum 15 auf, der auf der dem Arbeitsraum 5 gegenüberliegenden Seite des Kolbens 12 angeordnet ist. In den Steuerraum 15 mündet ein Anschluss 16, der über eine Überdruckleitung 17 und ein Überdruckventil 18 mit einer Überdruckquelle verbunden ist.Furthermore, the powder feed pump 1 has a control chamber 15 which is arranged on the opposite side of the working chamber 5 of the piston 12. In the control chamber 15 opens a port 16 which is connected via a pressure relief line 17 and a pressure relief valve 18 with a pressure source.

Weiterhin ist der Anschluss 16 über eine Unterdruckleitung 19 und ein Unterdruckventil 20 mit einer Unterdruckquelle verbunden, die ebenso wie die Überdruckquelle zur Vereinfachung nicht dargestellt ist. Über den Anschluss 16 kann der Druck in dem Steuerraum 15 eingestellt werden, um die Bewegung des Kolbens 12 zu steuern. Zur Abwärtsbewegung des Kolbens 12 wird das Überdruckventil 18 geöffnet, während das Unterdruckventil 20 geschlossen wird, wodurch der Druck in dem Steuerraum 15 entsprechend ansteigt und sich der Kolben 12 nach unten bewegt.Furthermore, the port 16 is connected via a vacuum line 19 and a vacuum valve 20 to a vacuum source, which is not shown as well as the overpressure source for simplicity. Via the port 16, the pressure in the control chamber 15 can be adjusted to control the movement of the piston 12. For downward movement of the piston 12, the pressure relief valve 18 is opened, while the vacuum valve 20 is closed, whereby the pressure in the control chamber 15 increases accordingly and the piston 12 moves downward.

Weiterhin mündet in den Arbeitsraum 5 der Pulverförderpumpe 1 ein Anschluss 21, der über ein Förderluftventil 22 mit einer Förderluftquelle verbunden. Im geöffneten Zustand des Förderluftventils 22 wird über den Anschluss 21 Förderluft in den Arbeitsraum 5 der Pulverförderpumpe 1 eingeblasen, wodurch das in dem Arbeitsraum 5 befindliche Pulver 2 über den Pulverauslass 9 ausgestoßen wird, falls das Pulverauslassventil 11 geöffnet ist.Furthermore, opens into the working space 5 of the powder feed pump 1, a port 21, which is connected via a conveying air valve 22 with a conveying air source. In the opened state of the conveying air valve 22, conveying air is blown into the working space 5 of the powder feed pump 1 via the connection 21, whereby the powder 2 located in the working space 5 is expelled via the powder outlet 9 if the powder outlet valve 11 is opened.

Zusätzlich kann an den Anschluss 21 über ein Unterdruckventil 23 ein Unterdruckanschluss angeschlossen sein, um einen Unterdruck in dem Arbeitsraum 5 zu erzeugen und den Kolben 12 dadurch nach unten zu ziehen. Diese Unterdrucksteuerung des Kolbens 12 ist jedoch nur optional und wird deshalb nicht weiter beschrieben.In addition, a vacuum connection can be connected to the connection 21 via a vacuum valve 23 in order to generate a negative pressure in the working space 5 and thereby pull the piston 12 downwards. However, this vacuum control of the piston 12 is only optional and will therefore not be further described.

Schließlich weist die Pulverförderpumpe 1 einen in den Steuerraum 15 hineinragenden Anschlag 24 und einen in den Arbeitsraum 5 hineinragenden Anschlag 25 auf, wobei die beiden Anschläge 24, 25 die Kolbenbewegung begrenzen und dadurch ein definiertes maximales Hubvolumen einstellen.Finally, the powder feed pump 1 has a protruding into the control chamber 15 stop 24 and a projecting into the working space 5 stop 25, wherein the two stops 24, 25 limit the piston movement and thereby set a defined maximum displacement.

Im Folgenden wird nun ein vollständiger Arbeitstakt der Pulverförderpumpe 1 beschrieben, wobei sich der Kolben 12 zu Beginn des beschriebenen Arbeitstaktes an dem unteren Anschlag 25 befindet, während das Pulvereinlassventil 8, das Pulverauslassventil 11, das Förderluftventil 22, das Unterdruckventil 20 und das Überdruckventil 18 geschlossen sind.In the following, a complete power stroke of the powder feed pump 1 will now be described, wherein the piston 12 is at the beginning of the described power stroke at the lower stop 25, while the powder inlet valve 8, the powder outlet valve 11, the conveying air valve 22, the vacuum valve 20 and the pressure relief valve 18 is closed are.

Zu Beginn des Arbeitstaktes werden dann das Pulvereinlassventil 8 und das Unterdruckventil 20 geöffnet, wodurch Luft aus dem Steuerraum 15 abgesaugt wird, was zu einer entsprechenden Druckminderung in dem Steuerraum 15 und einer Aufwärtsbewegung des Kolbens 12 führt. Die Aufwärtsbewegung des Kolbens 12 führt wiederum zu einer Druckminderung in dem Arbeitsraum 5, wodurch das Pulver 2 aus dem Pulverbehälter 3 über den Pulvereinlass 6 in den Arbeitsraum 5 eingesaugt wird.At the beginning of the power stroke, the powder inlet valve 8 and the vacuum valve 20 are then opened, whereby air is sucked out of the control chamber 15, resulting in a corresponding pressure reduction in the control chamber 15 and an upward movement of the piston 12. The upward movement of the piston 12 in turn leads to a reduction in pressure in the working space 5, whereby the powder 2 is sucked out of the powder container 3 via the powder inlet 6 into the working space 5.

Wenn der Kolben 12 an dem oberen Anschlag 24 anstößt, werden das Pulvereinlassventil 8 und das Unterdruckventil 20 geschlossen, während das Pulverauslassventil 11 und das Förderluftventil 22 geöffnet werden. Dadurch wird Förderluft über den Anschluss 21 in den Arbeitsraum 5 geblasen, wodurch das in dem Arbeitsraum 5 befindliche Pulver über den Pulverauslass 9 ausgestoßen wird.When the piston 12 abuts on the upper stopper 24, the powder inlet valve 8 and the negative pressure valve 20 are closed while the powder outlet valve 11 and the delivery air valve 22 are opened. As a result, conveying air is blown through the connection 21 into the working space 5, whereby the powder located in the working space 5 is expelled via the powder outlet 9.

Nach dem Ausstoßen des Pulvers 2 aus dem Arbeitsraum 5 wird dann bei weiterhin geöffnetem Pulverauslassventil 11 das Förderluftventil 22 geschlossen, während das Überdruckventil 18 geöffnet werden. Dadurch bewegt sich der Kolben 12 nach unten, bis der Kolben 12 schließlich an dem Anschlag 25 anstößt, woraufhin das Überdruckventil 18 geschlossen wird, so dass der Arbeitstakt beendet ist.After ejecting the powder 2 from the working space 5, the conveying air valve 22 is then closed while the powder outlet valve 11 is still open, while the pressure relief valve 18 is opened. As a result, the piston 12 moves down until the piston 12 finally abuts against the stop 25, whereupon the pressure relief valve 18 is closed, so that the power stroke is completed.

Das in Figur 2 dargestellte Ausführungsbeispiel stimmt weitgehend mit dem vorstehend beschriebenen und in Figur 1 dargestellten Ausführungsbeispiel überein, so dass zur Vermeidung von Wiederholungen weitgehend auf die vorstehende Beschreibung verwiesen wird und für entsprechende Bauteile dieselben Bezugszeichen verwendet werden.This in FIG. 2 illustrated embodiment is largely consistent with that described above and in FIG. 1 illustrated embodiment, so to avoid repetition, reference is made largely to the above description and the same reference numerals are used for corresponding components.

Eine Besonderheit dieses Ausführungsbeispiels besteht darin, dass der Kolben 12 auf der dem Steuerraum 15 zugewandten Seite mit zwei Zugfedern 26 verbunden ist, die an dem Gehäuse der Pulverförderpumpe 1 befestigt sind. Die beiden Zugfedern 26 unterstützen die Aufwärtsbewegung des Kolbens 12 beim Einsaugen des Pulvers 2 in den Arbeitsraum 5 und übernehmen die Aufwärtsbewegung anstelle des Vakuums.A special feature of this embodiment is that the piston 12 on the control chamber 15 side facing is connected to two tension springs 26 which are fixed to the housing of the powder feed pump 1. The two tension springs 26 support the upward movement of the piston 12 when sucking the powder 2 in the working space 5 and take over the upward movement instead of the vacuum.

Schließlich zeigt Figur 3 ein weiteres Ausführungsbeispiel, das ebenfalls weitgehend mit dem vorstehend beschriebenen und in Figur 1 dargestellten Ausführungsbeispiel übereinstimmt, so dass zur Vermeidung von Wiederholungen weitgehend auf die vorstehende Beschreibung zu Figur 1 verwiesen wird und für entsprechende Bauteile dieselben Bezugszeichen verwendet werden.Finally shows FIG. 3 a further embodiment, which also largely with the above-described and in FIG. 1 illustrated embodiment, so that to avoid repetition largely to the above description FIG. 1 is referenced and the same reference numerals are used for corresponding components.

Eine Besonderheit dieses Ausführungsbeispiels besteht darin, dass die Pulverförderpumpe 1 zwei Steuerräume 15.1, 15.2 zum pneumatischen Antrieb des Kolbens 12 aufweist, wobei der Steuerraum 15.1 auf der dem Arbeitsraum 5 abgewandten Seite des Kolbens 12 angeordnet ist, während sich der Steuerraum 15.2 auf derselben Seite des Kolbens 12 befindet wie der Arbeitsraum 5.A special feature of this embodiment is that the powder feed pump 1 has two control chambers 15.1, 15.2 for the pneumatic drive of the piston 12, wherein the control chamber 15.1 is arranged on the side facing away from the working chamber 5 of the piston 12, while the control chamber 15.2 on the same side of the Piston 12 is like the working space. 5

Der Steuerraum 15.1 kann hierbei in der gleichen Weise angesteuert werden, wie der Steuerraum 15 in Figur 1, so dass diesbezüglich auf die vorstehende Beschreibung verwiesen wird.The control chamber 15.1 can in this case be controlled in the same way as the control chamber 15 in FIG. 1 , so that reference is made in this regard to the above description.

Der Steuerraum 15.2 ist dagegen durch eine topfförmige, zylindrische Wandung 27 von dem Arbeitsraum 5 getrennt, wobei der Arbeitsraum 5 den Steuerraum 15.2 ringförmig umgibt.The control chamber 15.2, however, is separated by a cup-shaped, cylindrical wall 27 of the working space 5, wherein the working space 5 surrounds the control chamber 15.2 annular.

Weiterhin befindet sich in dem Kolben 12 eine ringförmige Nut 28, in die die Wandung 27 eingreift.Furthermore, located in the piston 12, an annular groove 28 into which the wall 27 engages.

Die Aufwärtsbewegung des Kolbens 12 wird hierbei eingeleitet, indem über einen Anschluss 29 und ein Überdruckventil 30 Druckluft in den Steuerraum 15.2 eingeblasen wird, wodurch sich der Kolben 12 nach oben bewegt und dabei das Pulver 2 über den Pulvereinlass 6 in den Arbeitsraum 5 einsaugt.The upward movement of the piston 12 is in this case initiated by 30 compressed air is injected into the control chamber 15.2 via a port 29 and a pressure relief valve, whereby the piston 12 moves upward and thereby sucks the powder 2 via the powder inlet 6 into the working space 5.

Bei der Abwärtsbewegung des Kolbens 12 wird der Überdruckanschluss 30 dagegen geschlossen, wohingegen ein mit dem Anschluss 29 verbundenes Auslassventil 31 geöffnet wird, so dass die in dem Steuerraum 15.2 befindliche Luft bei einer Abwärtsbewegung des Kolbens 12 über das Auslassventil 31 in die Umgebung abgegeben werden kann.On the other hand, in the downward movement of the piston 12, the overpressure port 30 is closed, whereas an outlet valve 31 connected to the port 29 is opened, so that the air in the control chamber 15.2 can be released into the environment via the outlet valve 31 during a downward movement of the piston 12 ,

Vorteilhaft an diesem Ausführungsbeispiel ist die Tatsache, dass die Aufwärtsbewegung des Kolbens 12 zum Einsaugen des Pulvers 2 in den Arbeitsraum 5 mit einer erheblich größeren Kraft erfolgen kann, da sich in dem Steuerraum 15.2 leicht ein starker Überdruck erzeugen lässt, wohingegen der Differenzdruck beim Ansaugen des Kolbens gemäß Figur 1 auf maximal 1 Bar begrenzt ist.An advantage of this embodiment is the fact that the upward movement of the piston 12 for sucking the powder 2 in the working space 5 can be done with a considerably larger force, since in the control chamber 15.2 can easily generate a strong overpressure, whereas the differential pressure during the suction of the Piston according to FIG. 1 is limited to a maximum of 1 bar.

Die Erfindung ist nicht auf die vorstehend beschriebenen Ausführungsbeispiele beschränkt. Vielmehr ist eine Vielzahl von Varianten und Abwandlungen möglich, die ebenfalls von dem Erfindungsgedanken Gebrauch machen wie er in Anspruch 1 definiert ist und deshalb in den Schutzbereich fallen.The invention is not limited to the embodiments described above. Rather, a variety of variants and modifications is possible, which also make use of the inventive idea as defined in claim 1 and therefore fall within the scope.

Claims (20)

  1. A powder pump (1) particularly for a powder coating device, including
    - a working space (5) with a variable working space volume,
    - a powder inlet (6) communicating with the working space (5) for sucking powder (2) into the working space (5),
    - a powder outlet (9) discharging from the working space (5) for ejecting the powder (2) located in the working space (5),
    - a movable piston (12), which constitutes a boundary surface of the working space (5) and, when moved upwardly, sucks the powder (2) through the powder inlet (6) into the working space (5),
    characterised in that
    the piston (12) is directly pneumatically driven.
  2. A powder pump (1) as claimed in claim 1, characterised by a control space (15,15.1,15.2) for pneumatically driving the piston (12), wherein the piston (12) affords a boundary surface of the control space (15,15.1,15.2).
  3. A powder pump (1) as claimed in claim 2, characterised in that the control space (15,15.1,15.2) and the working space (5) are situated on opposite sides of the piston (12).
  4. A powder pump (1) as claimed in claim 2, characterised in that the control space (15,15.1,15,2) and a working space (5) are situated on the same side of the piston (12).
  5. A powder pump (1) as claimed in claim 4, characterised in that the working space (5) annularly surrounds the control space (15,15.1,15.2).
  6. A powder pump (1) as claimed in 4, characterised in that the control space (15,15.1,15.2) annularly surrounds the working space (5).
  7. A powder pump (1) as claimed in one of the preceding claims, characterised in that a respective control space (15.1,15.2) is arranged on both sides of the piston (12), whereby the two control spaces (15.1,15.2) act on the opposite end surface of the piston (12) in order to drive the piston (12) pneumatically in two directions.
  8. A powder pump (1) as claimed in one of claims 2 to 7, characterised in that an overpressure connection (16,29) communicates with the control space (15,15.1,15.2) in order to move the piston (12) and to alter the working space volume accordingly.
  9. A powder pump (1) as claimed in one of claims 2 to 7, characterised in that a suction connection (16,29) communicates with the control space (15,15.1,15.2) in order to move the piston (12) and to alter the working space volume accordingly.
  10. A powder pump (1) as claimed in one of the preceding claims, characterised in that communicating with the working space (5) there is a conveying air connection (21) in order to inject conveying air into the working space (5) and thus to eject the powder (2) located in the working space (5) through the powder and outlet (9).
  11. A powder pump (1) as claimed in claim 10, characterised in that the conveying air connection (21) and the powder outlet (9) are arranged opposite to one another in the working space (5).
  12. A powder pump (1) as claimed in any one of the preceding claims, characterised in that communicating with the working space (5) is a suction connection (21,29) in order to move the piston (12) and to alter the working space volume accordingly.
  13. A powder pump (1) as claimed in one of the preceding claims, characterised in that the piston (12) is connected to at least one spring (26), which pushes or pulls the piston (12).
  14. A powder pump (1) as claimed in one of the preceding claims, characterised in that arranged in the working space (5) is a stop (25), which limits the movement of the piston when moving downwardly.
  15. A powder pump (1) as claimed in one of the preceding claims, characterised in that arranged in the control space 915,15.1,15.2) there is a stop (24), which limits the movement of the piston when moving upwardly.
  16. A powder pump (1) as claimed in one of the preceding claims, characterised in that the piston (12) consists substantially of an elastic material.
  17. A powder pump (1) as claimed in claim 16, characterised in that the piston (12) consists substantially of plastic material.
  18. A powder pump (1) as claimed in one of the preceding claims, characterised in that the piston (12) has an integrally formed sealing lip (13) on its wall surface in order to strip powder residues without a separate piston ring.
  19. A powder coating installation with a powder pump (1) as claimed in one of the preceding claims.
  20. Use of a powder pump (1) as claimed in one of claims 1 to 18 for conveying powder in a powder coating installation.
EP05004575A 2004-03-09 2005-03-02 Powder pump Not-in-force EP1574261B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004011445 2004-03-09
DE102004011445A DE102004011445A1 (en) 2004-03-09 2004-03-09 Powder feed pump

Publications (3)

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EP1574261A2 EP1574261A2 (en) 2005-09-14
EP1574261A3 EP1574261A3 (en) 2007-09-26
EP1574261B1 true EP1574261B1 (en) 2009-04-29

Family

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Application Number Title Priority Date Filing Date
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EP (1) EP1574261B1 (en)
AT (1) ATE429978T1 (en)
DE (2) DE102004011445A1 (en)
ES (1) ES2325770T3 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7731456B2 (en) 2005-10-07 2010-06-08 Nordson Corporation Dense phase pump with open loop control
DE102007011736A1 (en) * 2007-03-10 2008-09-11 Bayerische Motoren Werke Aktiengesellschaft Conveying device for conveying powder, particularly powder coating, out of storage container into powder discharge unit, has closed housing, and air permeable fluid base is arranged in housing that is spaced from front side of housing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH652100A5 (en) * 1983-04-28 1985-10-31 Frederic Dietrich POWDER TRANSPORT PROCESS AND IMPLEMENTATION DEVICE.
US5203507A (en) * 1990-12-11 1993-04-20 Matthews Richard H Air powered sprayer for dispensing material slurries
DE19959473A1 (en) * 1999-12-10 2001-06-13 Frederic Dietrich Device and method for the pneumatic conveying of powdery substances and use of the device
DE10145448A1 (en) 2001-09-14 2003-05-22 Bayerische Motoren Werke Ag Device for conveying powder and method for operating it

Also Published As

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DE102004011445A1 (en) 2005-09-22
ES2325770T3 (en) 2009-09-16
EP1574261A2 (en) 2005-09-14
DE502005007168D1 (en) 2009-06-10
EP1574261A3 (en) 2007-09-26
ATE429978T1 (en) 2009-05-15

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