EP1574261B1 - Pompe à poudre - Google Patents

Pompe à poudre 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
Authority
EP
European Patent Office
Prior art keywords
powder
piston
working space
space
powder pump
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.)
Not-in-force
Application number
EP05004575A
Other languages
German (de)
English (en)
Other versions
EP1574261A3 (fr
EP1574261A2 (fr
Inventor
Frank Herre
Hans-Georg Fritz
Thomas Dürr
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.)
Duerr Systems AG
Original Assignee
Duerr Systems AG
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 Duerr Systems AG filed Critical Duerr Systems AG
Publication of EP1574261A2 publication Critical patent/EP1574261A2/fr
Publication of EP1574261A3 publication Critical patent/EP1574261A3/fr
Application granted granted Critical
Publication of EP1574261B1 publication Critical patent/EP1574261B1/fr
Not-in-force legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • 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)
  • Air Transport Of Granular Materials (AREA)
  • Coating Apparatus (AREA)
  • Filling Or Emptying Of Bunkers, Hoppers, And Tanks (AREA)
  • Control Of The Air-Fuel Ratio Of Carburetors (AREA)

Claims (20)

  1. Pompe à poudre (1), en particulier pour une installation d'enduction par poudre, comprenant
    - une chambre de travail (5) avec un volume de chambre de travail variable,
    - une entrée de poudre (6) débouchant sur la chambre de travail (5) pour aspirer de la poudre (2) dans la chambre de travail (5),
    - une sortie de poudre (9) sortant de la chambre de travail (5) pour expulser la poudre (2) se trouvant dans la chambre de travail (5),
    - un piston mobile (12) qui forme une surface de limitation de la chambre de travail (5) et aspire la poudre (2) lors d'un mouvement montant à travers l'entrée de poudre (6) dans la chambre de travail (5),
    caractérisée en ce que
    le piston (12) est entraîné directement de façon pneumatique.
  2. Pompe à poudre (1) selon la revendication 1, caractérisée par une chambre de commande (15, 15.1, 15.2) pour l'entraînement pneumatique du piston (12), dans laquelle le piston (12) forme une surface de limitation de la chambre de commande (15, 15.1, 15.2).
  3. Pompe à poudre (1) selon la revendication 2, caractérisée en ce que la chambre de commande (15, 15.1, 15.2) et la chambre de travail (5) sont disposés sur des côtés opposés du piston (12).
  4. Pompe à poudre (1) selon la revendication 2, caractérisée en ce que la chambre de commande (15, 15.1, 15.2) et la chambre de travail (5) sont disposés du même côté du piston (12).
  5. Pompe à poudre (1) selon la revendication 4, caractérisée en ce que la chambre de travail (5) entoure la chambre de commande (15, 15.1, 15.2) de façon annulaire.
  6. Pompe à poudre (1) selon la revendication 4, caractérisée en ce que la chambre de commande (15, 15.1, 15.2) entoure la chambre de travail (5) de façon annulaire.
  7. Pompe à poudre (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que des deux côtés du piston (12), respectivement une chambre de commande (15.1, 15.2) est disposée, les deux chambres de commande (15.1, 15.2) agissant sur les faces frontales opposées du piston (12) pour entraîner le piston (12) de façon pneumatique dans deux directions.
  8. Pompe à poudre (1) selon l'une quelconque des revendications 2 à 7, caractérisée en ce que dans la chambre de commande (15, 15.1, 15.2) débouche un raccord de surpression (16, 29) pour déplacer le piston (12) et modifier le volume de la chambre de travail de façon correspondante.
  9. Pompe à poudre (1) selon l'une quelconque des revendications 2 à 7, caractérisée en ce que dans la chambre de commande (15, 15.1, 15.2) débouche un raccord de dépression (16, 29) pour déplacer le piston (12) et modifier le volume de la chambre de travail de façon correspondante.
  10. Pompe à poudre (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que dans la chambre de travail (5) débouche un raccord d'air de refoulement (21) pour insuffler de l'air de refoulement dans la chambre de travail (5) et pour expulser ainsi la poudre (2) se trouvant dans la chambre de travail (5) à travers la sortie de poudre (9).
  11. Pompe à poudre (1) selon la revendication 10, caractérisée en ce que le raccord d'air de refoulement (21) et la sortie de poudre (9) sont disposés dans la chambre de travail (5) en se trouvant face à face.
  12. Pompe à poudre (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que dans la chambre de travail (5) débouche un raccord de dépression (21, 29) pour déplacer le piston (12) et modifier le volume de la chambre de travail de façon correspondante.
  13. Pompe à poudre (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le piston (12) est relié à au moins un ressort (26) qui pousse ou attire le piston (12).
  14. Pompe à poudre (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que une butée (25) est disposée dans la chambre de travail (5), qui limite le mouvement de piston lors d'un mouvement descendant.
  15. Pompe à poudre (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que une butée (24) est disposée dans la chambre de commande (15, 15.1, 15.2), qui limite le mouvement de piston lors d'un mouvement montant.
  16. Pompe à poudre (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le piston (12) est substantiellement composé d'un matériau élastique.
  17. Pompe à poudre (1) selon la revendication 16, caractérisée en ce que le piston (12) est substantiellement composé de matière plastique.
  18. Pompe à poudre (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le piston (12) présente sur sa surface latérale une lèvre d'étanchéité (13) rapportée d'une seule pièce pour essuyer des résidus de poudre sans segment de piston séparé.
  19. Installation d'enduction par poudre avec une pompe à poudre (1) selon l'une quelconque des revendications précédentes.
  20. Utilisation d'une pompe à poudre (1) selon l'une quelconque des revendications 1 à 18 pour le refoulement de poudre dans une installation d'induction par poudre.
EP05004575A 2004-03-09 2005-03-02 Pompe à poudre Not-in-force EP1574261B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004011445 2004-03-09
DE102004011445A DE102004011445A1 (de) 2004-03-09 2004-03-09 Pulverförderpumpe

Publications (3)

Publication Number Publication Date
EP1574261A2 EP1574261A2 (fr) 2005-09-14
EP1574261A3 EP1574261A3 (fr) 2007-09-26
EP1574261B1 true EP1574261B1 (fr) 2009-04-29

Family

ID=34813624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05004575A Not-in-force EP1574261B1 (fr) 2004-03-09 2005-03-02 Pompe à poudre

Country Status (4)

Country Link
EP (1) EP1574261B1 (fr)
AT (1) ATE429978T1 (fr)
DE (2) DE102004011445A1 (fr)
ES (1) ES2325770T3 (fr)

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 (de) * 2007-03-10 2008-09-11 Bayerische Motoren Werke Aktiengesellschaft Förderanlage für ein Pulver

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH652100A5 (fr) * 1983-04-28 1985-10-31 Frederic Dietrich Procede de transport des poudres et dispositif de mise en oeuvre.
US5203507A (en) * 1990-12-11 1993-04-20 Matthews Richard H Air powered sprayer for dispensing material slurries
DE19959473A1 (de) * 1999-12-10 2001-06-13 Frederic Dietrich Vorrichtung und Verfahren zum pneumatischen Fördern pulverförmiger Stoffe sowie Verwendung der Vorrichtung
DE10145448A1 (de) 2001-09-14 2003-05-22 Bayerische Motoren Werke Ag Vorrichtung zum Fördern von Pulver und Verfahren zu deren Betrieb

Also Published As

Publication number Publication date
DE102004011445A1 (de) 2005-09-22
EP1574261A3 (fr) 2007-09-26
ATE429978T1 (de) 2009-05-15
ES2325770T3 (es) 2009-09-16
EP1574261A2 (fr) 2005-09-14
DE502005007168D1 (de) 2009-06-10

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