EP2146802B1 - Garniture de tige de piston pour un cylindre d'isolation d'une installation d'enduction - Google Patents

Garniture de tige de piston pour un cylindre d'isolation d'une installation d'enduction Download PDF

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Publication number
EP2146802B1
EP2146802B1 EP08749428A EP08749428A EP2146802B1 EP 2146802 B1 EP2146802 B1 EP 2146802B1 EP 08749428 A EP08749428 A EP 08749428A EP 08749428 A EP08749428 A EP 08749428A EP 2146802 B1 EP2146802 B1 EP 2146802B1
Authority
EP
European Patent Office
Prior art keywords
piston rod
seal
leakage
piston
sealing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP08749428A
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German (de)
English (en)
Other versions
EP2146802A2 (fr
Inventor
Frank Herre
Rainer Melcher
Manfred Michelfelder
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
Priority to PL08749428T priority Critical patent/PL2146802T3/pl
Publication of EP2146802A2 publication Critical patent/EP2146802A2/fr
Application granted granted Critical
Publication of EP2146802B1 publication Critical patent/EP2146802B1/fr
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Classifications

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

Definitions

  • the invention relates to a piston rod seal for an insulating cylinder of an electrostatic coating system and a corresponding operating method according to the independent claims.
  • Out DE 10 2005 048 223 A1 is a painting known in which a paint memory is connected via an isolation cylinder with a downstream paint dosing, wherein the paint dosing metered metered the paint to be applied and fed to a rotary atomizer or other application device.
  • the insulation cylinder in this case allows electrical isolation of the paint dosing relative to the paint reservoir. This is advantageous because the Lackdosierer is usually at high voltage potential in an electrostatic painting process, while the paint reservoir electrically insulated paint storage is at ground potential and therefore can be refilled during the painting process.
  • the paint residues located in the insulation cylinder are removed by a stripping piston from the inner wall of the insulation cylinder to produce the required dielectric strength.
  • the stripping piston is in this case attached to one end of a piston rod which is displaceably mounted in a piston rod guide and carries at its other end a pneumatic piston which can be pneumatically driven in a pneumatic cylinder to move the stripping piston in the insulating cylinder.
  • the invention is therefore based on the object to improve the above-described known isolation cylinder accordingly.
  • the invention comprises the general technical teaching that the piston rod seal not only has a single seal, but at least two seals, which are arranged offset in the axial direction.
  • the additional seal offers increased safety, since the sealing function is not impaired even if a seal fails.
  • the inventive arrangement of several spatially separated seals allows error monitoring by the gap between the two seals is monitored for leakage.
  • a leakage space is preferably arranged in the axial direction between the two seals, wherein the leakage space is located in the radial direction between the piston rod guide and the lateral surface of the piston rod and absorbs leakage of the paint passing through in case of leakage of the paint-side seal.
  • a leakage bore extends from the leakage space to dissipate the leakage entering the leakage space.
  • the leakage hole can be used to detect leakage.
  • the leakage bore lead, for example, to a sensor, which may be, for example, a pressure sensor or a humidity sensor. If the leak sensor detects a leak, the piston rod seal is replaced at the earliest opportunity, which may occur, for example, during normal business interruptions at night or at the weekend, so that the regular painting operation is not affected by a leakage in the piston rod seal.
  • the piston rod preferably carries on the opposite side of the stripping a pneumatic piston which is slidably disposed in a pneumatic cylinder and can be pressurized to move the pneumatic piston and thus the piston rod and the stripping piston in the axial direction.
  • the piston rod seal according to the invention preferably has a further seal, which is axially offset from the two above-mentioned redundant seals and has the task to seal against the pneumatic cylinder.
  • the piston rod seal so three seals, namely two wet paint seals on the side of the Abstreifkolbens or on the side of the insulating cylinder and at least one pneumatic seal on the side of the pneumatic cylinder. Furthermore, it is advantageous in the context of the invention if the seals have a plurality of sealing edges, whereby the life of the seals is increased. In the preferred embodiment of the invention, therefore, the wet paint seals each have double sealing edges.
  • wet paint seals are preferably made of a thermoplastic sealing material, such as polytetrafluoroethylene (PTFE) or polyethylene (PE).
  • PTFE polytetrafluoroethylene
  • PE polyethylene
  • the invention is not limited to the above-mentioned examples in terms of the sealing material, but in principle can be realized with other sealing materials.
  • the seals can optionally be supported by a metal spring to achieve a satisfactory sealing effect.
  • the piston rod has a low surface roughness on its lateral surface with a roughness Rz ⁇ 20 ⁇ m, Rz ⁇ 10 ⁇ m, Rz ⁇ 5 ⁇ m or even Rz ⁇ 2 ⁇ m.
  • this is advantageous because a smooth sealing surface of the piston rod complicates Farbverschleppungen in the axial direction by the piston rod guide.
  • the service life of the piston rod seal is increased by a low surface roughness.
  • the piston rod at its sealing surface has a material handling content of more than 60%, 70% or even more than 80%.
  • the piston rod on its sealing surface a wear-reducing surface coating which can for example consist of a diamond-like carbon layer, such as Dylyn ® or DLC TM (DLC: Diamond-like carbon).
  • a wear-reducing surface coating which can for example consist of a diamond-like carbon layer, such as Dylyn ® or DLC TM (DLC: Diamond-like carbon).
  • this surface coating for example, by means of a plasma-assisted chemical vapor deposition (PACVD: P lasma A ssisted C hemical V apor D eposition) are made or by a physical vapor deposition (P hysical V apor D eposition PVD).
  • P PVD plasma-assisted chemical vapor deposition
  • PVD physical vapor deposition
  • the invention is not only directed to a novel piston rod seal as a single component, but also comprises a coating agent supply device and a paint shop, which have such a piston rod seal as a component.
  • the invention also encompasses a novel method of operating such a piston rod seal, in which the insulation atomizer between the stripping piston and the piston rod seal is flushed with a rinsing agent or a coating agent to prevent coating agent residues from depositing on the lateral surface of the piston rod and then through the piston rod guide be dragged through in the axial direction.
  • This rinsing can be done regularly to avoid the disadvantages described above from the outset.
  • FIG. 1 shows an electrostatic painting plant for serial painting of motor vehicle body parts or other components, the structure and operation of this paint system in detail in the above-cited patent application DE 10 2005 048 223 A1 is described, so that the content of this patent application with regard to the structure and operation of the paint shop this description is fully attributable.
  • the paint shop has a color changer 1, a valve assembly 2, a paint reservoir 3, a further valve assembly 4, a paint dispenser 5 and a rotary atomizer 6 as an application device.
  • the paint reservoir 3 on the one hand and the paint doser 5 on the other hand can be at different electrical potentials during operation of the paint shop.
  • the paint doser 5 when applying the paint, generally has a high-voltage potential in order to achieve optimum adhesion of the applied paint to the electrically grounded motor vehicle body parts.
  • the paint reservoir 3 is generally at ground potential during operation of the paint shop, so that the paint store 3 can already be filled with a new paint during painting.
  • an insulating cylinder 7 is provided, in which a stripping piston 8 is guided axially displaceable.
  • the stripping piston 8 is moved to the position shown in the drawing to the right, wherein the stripping piston 8 scrapes paint residues from the inner wall of the insulation cylinder 7 and thereby increases the dielectric strength of the insulation cylinder 7.
  • the movement of the Abstreifkolbens 8 in the isolation cylinder 7 takes place here by a pneumatic cylinder 9, which is arranged on the opposite side of the insulating cylinder 7.
  • a pneumatic piston 10 is axially displaceable, wherein the pneumatic piston 10 is connected via a piston rod 11 with the stripping piston 8.
  • the pneumatic piston 10 can be pressurized by valves on both sides with pressure to move the pneumatic piston 10 and thus also the piston rod 11 and the stripping piston 8 in the axial direction.
  • the special feature according to the invention in this case consists in the structural design of a piston rod seal 12, which is shown in Figure 2.
  • the piston rod seal 12 has a plurality of components 13, 14, 15, 16 screwed together, which surround the piston rod 11 and receive two wet-paint seals 17, 18 and a pneumatic seal 19.
  • the two wet paint seals 17, 18 are in this case arranged on the side facing the insulating cylinder 7 and prevent lacquer from entering the pneumatic cylinder 9 or the piston rod seal 12 from the insulating cylinder 7 in the axial direction through the piston rod seal 12.
  • the pneumatic seal 19 is arranged on the pneumatic cylinder 9 facing side of the piston rod seal 12 and pressure-resistant, so that a pneumatic drive pressure in the pneumatic cylinder 9 is maintained.
  • piston rod seal 12 has a leakage space 20, which is arranged in the axial direction between the two wet paint seals 17, 18 and in the radial direction between the lateral surface of the piston rod 11 and the surrounding component 14.
  • FIG. 3 finally shows a possible embodiment of the wet paint seal 17 with two sealing edges 22, 23, whereby the service life of the wet paint seal 17 is advantageously increased.

Landscapes

  • Electrostatic Spraying Apparatus (AREA)
  • Sealing Devices (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Reciprocating Pumps (AREA)
  • Actuator (AREA)
  • Formation And Processing Of Food Products (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
  • Fluid-Damping Devices (AREA)
  • Spray Control Apparatus (AREA)

Claims (14)

  1. Garniture d'étanchéité pour tige de piston (12) pour un cylindre d'isolation (7) d'une installation de revêtement, en particulier d'une installation de revêtement électrostatique, comportant
    a) un guidage de tige de piston pour le guidage mobile dans la direction axiale d'une tige de piston (11), ladite tige de piston (11) portant un piston racleur (8) pour racler les résidus de peinture adhérant sur la paroi intérieure du cylindre d'isolation (7), et
    b) un premier joint d'étanchéité (17) pour étancher le guidage de la tige de piston par rapport à la tige de piston (11),
    caractérisée par
    c) un deuxième joint d'étanchéité (18) pour étancher le guidage de la tige de piston par rapport à la tige de piston (11), ledit deuxième joint d'étanchéité (18) étant agencé en étant décalé axialement par rapport au premier joint d'étanchéité (17).
  2. Garniture d'étanchéité pour tige de piston (12) selon la revendication 1, caractérisée par un espace pour fuite (20), qui est disposé dans la direction axiale entre le premier joint d'étanchéité (17) et le deuxième joint d'étanchéité (18) et dans la direction radiale entre la tige de piston (11) et le guidage de la tige de piston, et qui reçoit une fuite en cas d'inétanchéité du premier joint d'étanchéité (17).
  3. Garniture d'étanchéité pour tige de piston (12) selon la revendication 2, caractérisée par
    a) une forure (21) partant de l'espace pour fuite (20) pour évacuer la fuite hors de l'espace pour fuite (20), et/ou
    b) un capteur de fuite destiné à détecter la fuite, ledit capteur de fuite étant disposé dans l'espace pour fuite ou étant relié à l'espace pour fuite via la forure.
  4. Garniture d'étanchéité pour tige de piston (12) selon l'une quelconque des revendications précédentes, caractérisée par un troisième joint d'étanchéité (19) destiné à étancher le guidage de la tige de piston par rapport à la tige de piston (11), ledit troisième joint d'étanchéité (19) et le deuxième joint d'étanchéité (18) étant disposés en étant décalés axialement.
  5. Garniture d'étanchéité pour tige de piston (12) selon l'une quelconque des revendications précédentes, caractérisée en ce que la tige de piston (11) porte, sur un côté, le piston racleur (8) et, sur l'autre côté, un piston pneumatique (10), qui est logé de manière mobile dans un vérin pneumatique (9).
  6. Garniture d'étanchéité pour tige de piston (12) selon la revendication 5, caractérisée
    a) en ce que le premier joint d'étanchéité (17) et le deuxième joint d'étanchéité (18) sont des joints pour peinture humide et sont disposés sur le côté du cylindre d'isolation (7), et
    b) en ce que le troisième joint d'étanchéité (19) est une garniture d'étanchéité pneumatique et est agencé sur le côté du vérin pneumatique (9).
  7. Garniture d'étanchéité pour tige de piston (12) selon l'une quelconque des revendications précédentes, caractérisée en ce que le premier joint d'étanchéité (17) et/ou le deuxième joint d'étanchéité (18) et/ou le troisième joint d'étanchéité (19) comportent plusieurs arêtes d'étanchéité (22, 23), qui assurent l'étanchéité par rapport à la paroi latérale de la tige de piston (11).
  8. Garniture d'étanchéité pour tige de piston (12) selon l'une quelconque des revendications précédentes, caractérisée en ce que le premier joint d'étanchéité (17) et/ou le deuxième joint d'étanchéité (18) sont réalisés dans un matériau d'étanchéité thermoplastique, en particulier en polytétrafluoréthylène ou en polyéthylène.
  9. Garniture d'étanchéité pour tige de piston (12) selon l'une quelconque des revendications précédentes, caractérisée en ce que le premier joint d'étanchéité (17) et/ou le deuxième joint d'étanchéité (18) comportent un ressort métallique.
  10. Garniture d'étanchéité pour tige de piston (12) selon l'une quelconque des revendications précédentes, caractérisée
    a) en ce que la tige de piston (11), sur sa surface étanche, présente une rugosité de surface avec un coefficient de rugosité Rz < 20 µm, Rz < 10 µm, Rz < 5 µm ou Rz < 2 µm, et/ou
    b) en ce que la tige de piston (11), sur sa surface étanche, présente un pourcentage de portée de matière de plus de 60 %, 70 % ou 80 %, et/ou
    c) en ce que la tige de piston (11), sur sa surface étanche, est munie d'un revêtement de surface réduisant l'usure.
  11. Garniture d'étanchéité pour tige de piston (12) selon la revendication 10, caractérisée
    a) en ce que le revêtement de surface est formé par une couche de carbone de type diamant, en particulier en Dylin® ou DLC™, et/ ou
    b) en ce que le revêtement de surface est déposé par un procédé de dépôt chimique en phase vapeur assisté par plasma ou par un procédé de dépôt physique en phase vapeur.
  12. Dispositif d'alimentation en produit de revêtement, comportant un cylindre d'isolation (7) pour l'isolation électrique des pièces à un potentiel différent, caractérisé par une garniture d'étanchéité pour tige de piston (12) selon l'une quelconque des revendications précédentes.
  13. Procédé d'exploitation pour un dispositif de revêtement, en particulier une installation de revêtement électrostatique, comportant un cylindre d'isolation (7) selon l'une quelconque des revendications précédentes, dans lequel un piston racleur (8) est guidé par une tige de piston (11), ladite tige de piston (11) étant guidée dans un guidage de tige de piston muni d'une garniture d'étanchéité pour tige de piston (12), caractérisé en ce que le cylindre d'isolation (7) est balayé entre le piston racleur (8) et la garniture d'étanchéité pour tige de piston (12) avec un produit de nettoyage ou avec un produit de revêtement.
  14. Procédé d'exploitation selon la revendication 13, caractérisé
    a) en ce que le balayage est effectué régulièrement, et/ou
    b) en ce que la garniture d'étanchéité pour tige de piston comporte au moins deux joints d'étanchéité (17, 18) décalés dans la direction axiale, lesquels délimitent un espace pour fuite (20), ledit espace pour fuite (20) étant balayé.
EP08749428A 2007-05-23 2008-05-09 Garniture de tige de piston pour un cylindre d'isolation d'une installation d'enduction Active EP2146802B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08749428T PL2146802T3 (pl) 2007-05-23 2008-05-09 Uszczelnienie tłoczyska dla cylindra izolacyjnego instalacji powlekania

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007023931A DE102007023931A1 (de) 2007-05-23 2007-05-23 Kolbenstangendichtung für einen Isolationszylinder einer Beschichtungsanlage
PCT/EP2008/003771 WO2008141742A2 (fr) 2007-05-23 2008-05-09 Garniture de tige de piston pour un cylindre d'isolation d'une installation d'enduction

Publications (2)

Publication Number Publication Date
EP2146802A2 EP2146802A2 (fr) 2010-01-27
EP2146802B1 true EP2146802B1 (fr) 2011-01-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08749428A Active EP2146802B1 (fr) 2007-05-23 2008-05-09 Garniture de tige de piston pour un cylindre d'isolation d'une installation d'enduction

Country Status (12)

Country Link
US (1) US8387558B2 (fr)
EP (1) EP2146802B1 (fr)
JP (1) JP5406826B2 (fr)
KR (1) KR101525605B1 (fr)
CN (1) CN101678375B (fr)
AT (1) ATE494072T1 (fr)
BR (1) BRPI0811740B1 (fr)
DE (2) DE102007023931A1 (fr)
ES (1) ES2358965T3 (fr)
MX (1) MX2009012530A (fr)
PL (1) PL2146802T3 (fr)
WO (1) WO2008141742A2 (fr)

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Also Published As

Publication number Publication date
DE102007023931A1 (de) 2008-12-04
JP2010530796A (ja) 2010-09-16
ATE494072T1 (de) 2011-01-15
CN101678375B (zh) 2013-05-01
WO2008141742A2 (fr) 2008-11-27
DE502008002222D1 (de) 2011-02-17
ES2358965T3 (es) 2011-05-17
EP2146802A2 (fr) 2010-01-27
WO2008141742A3 (fr) 2009-02-05
MX2009012530A (es) 2009-12-03
KR20100023847A (ko) 2010-03-04
CN101678375A (zh) 2010-03-24
US20100163638A1 (en) 2010-07-01
JP5406826B2 (ja) 2014-02-05
PL2146802T3 (pl) 2011-06-30
US8387558B2 (en) 2013-03-05
BRPI0811740A2 (pt) 2014-10-21
BRPI0811740B1 (pt) 2019-09-10
KR101525605B1 (ko) 2015-06-04

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