EP0192854A1 - Spray pistol for coating material - Google Patents

Spray pistol for coating material Download PDF

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Publication number
EP0192854A1
EP0192854A1 EP85116536A EP85116536A EP0192854A1 EP 0192854 A1 EP0192854 A1 EP 0192854A1 EP 85116536 A EP85116536 A EP 85116536A EP 85116536 A EP85116536 A EP 85116536A EP 0192854 A1 EP0192854 A1 EP 0192854A1
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EP
European Patent Office
Prior art keywords
coating material
nozzle attachment
spray gun
nozzle
kit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP85116536A
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German (de)
French (fr)
Inventor
Anton Rath
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gema Switzerland GmbH
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Gema Switzerland GmbH
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Filing date
Publication date
Application filed by Gema Switzerland GmbH filed Critical Gema Switzerland GmbH
Publication of EP0192854A1 publication Critical patent/EP0192854A1/en
Withdrawn legal-status Critical Current

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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
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/01—Spray pistols, discharge devices
    • 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
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/08—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point
    • B05B7/0807—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets
    • B05B7/0815—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter
    • B05B7/0838—Spray pistols; Apparatus for discharge with separate outlet orifices, e.g. to form parallel jets, i.e. the axis of the jets being parallel, to form intersecting jets, i.e. the axis of the jets converging but not necessarily intersecting at a point to form intersecting jets with at least one gas jet intersecting a jet constituted by a liquid or a mixture containing a liquid for controlling the shape of the latter comprising a single means controlling simultaneously the flow rates of shaping and spraying gas jets
    • 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
    • B05B7/02—Spray pistols; Apparatus for discharge
    • B05B7/12—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1209—Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages the controlling means for each liquid or other fluent material being manual and interdependent

Definitions

  • the invention relates to a spray gun for coating material, with a housing in which there are at least one channel for coating material and at least one channel for gas, which lead to a connection end of the housing, to which a nozzle attachment kit can be fastened, through which the coating material is sprayed.
  • the invention particularly relates to spray guns for liquid coating material such as e.g. Paint.
  • the invention also includes the spraying of powdered coating materials.
  • the object of the invention is to reduce the cost of materials and the costs required for them, which are required for spray guns, if coating material is to be sprayed using various atomization processes.
  • the spray gun forms a kit with several different nozzle attachment kits, in which one of the different nozzle attachment kits can be detachably attached to the connection end of the spray gun housing, and each nozzle attachment kit together with the spray gun uses a different atomization method working atomizer, especially for liquid coating materials
  • a coating material channel 8 leads from an inlet 6 to the downstream connection end 2.
  • an inlet channel 10 leads through a pistol grip 9, which via two gas channels 12 and 14 of the housing 4 is also in each case connected to the downstream connection end 2.
  • a lever 16 actuates a valve 18 in the inlet duct 10 and an actuating member 20 for a further valve of a nozzle attachment kit, which can be connected to the connection end 2.
  • the latter further valve blocks or opens the flow path of the coating material from the coating material channel 8 through the relevant nozzle attachment kit.
  • the gas channel 14 there is an adjustable and also lockable flow restrictor 22.
  • the connection end 2 is designed so that the nozzle attachment kits which are adapted to it consist of only a few components, although together with the spray gun they are each ver form different atomization processes working atomizers.
  • valve body 32 which can be screwed onto the actuating member 20 in the form of a valve needle
  • nozzle body 36 which can be screwed coaxially to it into an internal thread 34 of the connection end 2 and an inner valve seat 38 for the valve body 32
  • one of the two parts 32 and 36 overlapping atomizer air cap 40 which can be screwed coaxially to them with an internal thread 42 onto an external thread 44 of the connection end 2.
  • nozzle attachment kit 30 If the nozzle attachment kit 30 is screwed onto the connection end 2, coating material can flow out of the channel 8 via the valve 32, 38 through the nozzle body 36 when the lever 16 is actuated, and atomizing air can flow from the gas channel 12 via bores 46 and 48 of the nozzle body 36 and of the atomizer air cap 40, and additional air can also escape from the gas channel 14 via channels 50 in horns 52 of the atomizer air cap 40.
  • the nozzle attachment kit 30, together with the spray gun enables the coating material to be sprayed using the air atomization method. Electrodes 53 on the cap 40 electrostatically charge the coating material.
  • the nozzle attachment kit 30 of FIG. 2 can be exchanged for a nozzle attachment kit 60 of FIG. 3.
  • valve body 62 which can be screwed onto the actuating member 20 and has a valve ball, a valve seat 64 which can be screwed into the internal thread 34 of the connection end 2 for this valve body, and a nozzle cap 66 with an internal thread 42 for screwing onto the external thread 44 of the connection end 2.
  • nozzle attachment kit is on Connection end 2 1
  • coating material can escape from the channel 8 via the valve 62, 64 through an atomizing nozzle 68 which is screwed axially into the nozzle cap 66 and, because of the special but known shape of its nozzle mouth 70, atomization when the lever 16 of FIG. 1 is actuated of the coating material after the airless atomization process.
  • additional air can escape from the gas channel 14 via channels 72 of the atomizing nozzle 68 into the nozzle mouth 70, which supports the atomization of the coating material.
  • the nozzle attachment kits 30 and 60 can be exchanged for a nozzle attachment kit 80 from FIG. 4. This is almost identical to the nozzle attachment kit 60 from FIG. 2, which is why structurally corresponding parts are provided with the same reference numbers and have the same function. The only difference is that instead of the atomizer nozzle 68, an atomizer nozzle 82 is inserted into the nozzle cap 66. The atomizing nozzle 82 has no gas channels. No air is connected to the spray gun, channel 10. Flow restrictor 22 can be closed. The coating material is atomized using the airless atomization process without additional air.
  • the spray gun of FIGS. 5 and 6 is used to spray powder coating material onto objects. It is tubular and contains a base body 102, an interchangeably plugged-on intermediate piece 104 and, according to FIG. 5, a nozzle attachment kit 106 which can be plugged onto the latter and which bears against one 6 is interchangeable.
  • a coating material channel 110 leads axially through the base body 102 and the intermediate piece 104 and opens into the nozzle attachment kit 106 or 108. 5 atomizes the powdery coating material in that the material flow creates a negative pressure after the Coanda effect with a nozzle orifice wall 112, by means of which the material flow is torn apart radially.
  • the atomization is supported by atomizing air, which is supplied from an external compressed air source 114 via a shut-off valve 116 to a gas channel 118 of the spray gun and flows through an outlet 120 into a nozzle mouth 121.
  • the atomization takes place according to the known baffle plate-free atomization process.
  • Electrical lines 122 are connected to electrodes 124, which are arranged in the material channel 110 and electrostatically charge the coating material.
  • Another gas source 126 provides a Ans p errventil 128 compressed air to a further gas passage 130 from which it exits through an annular die 132 and forms an enveloping the atomized coating material gas jacket.
  • the gas channels 118 and 130 are closed and the atomization of the coating material is effected by an impact body 134 which is arranged in the flow path of the coating material downstream of a nozzle wall 136.
  • the compressed air sources 114 and 126 are not required when using the nozzle attachment kit 108 from FIG. 6 and can be switched off.
  • the powdery coating material is atomized by its deflection on Impact body 134 according to the known baffle plate atomization process.

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  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Nozzles (AREA)

Abstract

Ein Pistolenteil bildet zusammen mit mehreren wahlweise verwendbaren Düsenanbausätzen (30, 60, 80) verschiedene Spritzpistolen, die nach verschiedenen Zerstäubungsverfahren arbeiten. Dadurch wird für die verschiedenen Zerstäubungsverfahren nicht mehr eine Vielzahl kompletter Spritzpistolzn benötigt, sondern lediglich ein Pistolenteil mit mehreren auswechselbaren Düsenanbausätzen.A gun part together with several optional nozzle attachment kits (30, 60, 80) forms different spray guns that work according to different atomization processes. As a result, a large number of complete spray gun prongs are no longer required for the various atomization processes, but rather only one gun part with several interchangeable nozzle attachment kits.

Description

Die Erfindung betrifft eine Spritzpistole für Beschichtungsmaterial, mit einem Gehäuse, in welchem sich mindestens ein Kanal für Beschichtungsmaterial und mindestens ein Kanal für Gas befinden, die zu einem Anschlußende des Gehäuses führen, an welchem ein Düsenanbausatz befestigbar ist, durch welchen das Beschichtungsmaterial versprüht wird.The invention relates to a spray gun for coating material, with a housing in which there are at least one channel for coating material and at least one channel for gas, which lead to a connection end of the housing, to which a nozzle attachment kit can be fastened, through which the coating material is sprayed.

Die Erfindung betrifft insbesondere Spritzpistolen für flüssiges Beschichtungsmaterial wie z.B. Lack. Die Erfindung umfaßt jedoch auch das Versprühen von pulverförmigen Beschichtungsmaterialien.The invention particularly relates to spray guns for liquid coating material such as e.g. Paint. However, the invention also includes the spraying of powdered coating materials.

Durch die Erfindung soll die Aufgabe gelöst werden, den Materialaufwand und die dafür erforderlichen Kosten zu reduzieren, die für Spritzpistolen erforderlich sind, wenn nach verschiedenen Zerstäubungsverfahren Beschichtungsmaterial versprüht werden soll.The object of the invention is to reduce the cost of materials and the costs required for them, which are required for spray guns, if coating material is to be sprayed using various atomization processes.

Diese Aufgabe wird gemäß der Erfindung dadurch gelöst, daß die Spritzpistole mit mehreren verschiedenen Düsenanbausätzen einen Bausatz bildet, bei welchem wahlweise je einer der verschiedenen Düsenanbausätze lösbar am Anschlußende des Gehäuses der Spritzpistole befestigbar ist, und jeder Düsenanbausatz zusammen mit der Spritzpistole einen nach einem anderen Zerstäubungsverfahren arbeitenden Zerstäuber bildet, insbesondere für flüssige BeschichtungsmaterialienThis object is achieved according to the invention in that the spray gun forms a kit with several different nozzle attachment kits, in which one of the different nozzle attachment kits can be detachably attached to the connection end of the spray gun housing, and each nozzle attachment kit together with the spray gun uses a different atomization method working atomizer, especially for liquid coating materials

je einen Zerstäuber für

  • a) Druckluftzerstäubungsverfahren,
  • b) Airless-Zerstäubungsverfahren, und
  • c) Airless-Zerstäubungsverfahren mit zusätzlicher Zerstäuberluft,

oder für pulverförmige Beschichtungsmaterilien je einen Zerstäuber für
  • d) Prallplattenzerstäubungsverfahren und
  • e) Prallplattenloses Zerstäubungsverfahren.
an atomizer for each
  • a) compressed air atomization process,
  • (b) airless spraying, and
  • c) airless atomization process with additional atomizing air,

or an atomizer for powder coating materials
  • d) baffle atomization process and
  • e) Baffle-less atomization process.

Dadurch ergibt sich der Vorteil, daß für verschiedene Zerstäubungsverfahren nur eine einzige Spritzpistole mit wenigen auswechselbaren Bauteilen erforderlich ist, welch letztere für jedes Zerstäubungsverfahren zu einem "Düsenanbausatz" zusammengefaßt sind. Dadurch verringert sich der für verschiedene Zerstäubungsverfahren erforderliche materielle und finanzielle Aufwand erheblich.This has the advantage that only a single spray gun with a few interchangeable components is required for various atomization processes, the latter being combined into a “nozzle attachment kit” for each atomization process. This considerably reduces the material and financial expenditure required for various atomization processes.

Weitere Merkmale der Erfindung sind in den Unteransprüchen enthalten.Further features of the invention are contained in the subclaims.

Im Rahmen der Erfindung ist es zweckmäßig, möglichst viele der für die Düsenfunktion erforderlichen Teile im Gehäuse unterzubringen und möglichst nur wenige, das bedeutet nur die unbedingt auszutauschenden Teile, in die Düsenanbausätze aufzunehmen.In the context of the invention, it is expedient to accommodate as many of the parts required for the nozzle function in the housing and as few as possible, that is to say only the parts that must be replaced, in the nozzle mounting kits.

Die Erfindung wird im folgenden anhand mehrerer Ausführungsformen mit Bezug auf Zeichnungen beschrieben. Darin zeigen:

  • Fig. 1 einen Längsschnitt einer Spritzpistole nach der Erfindung für flüssiges Beschichtungsmaterial, jedoch ohne Düsenanbausatz,
  • Fig. 2 das Anschlußende eines Gehäuses der Spritzpistole von Fig. 1 mit einem daran anzuschließenden, gegenüberliegend gezeichneten Düsenanbausatz für ein Druckluftzerstäubungsverfahren,
  • Fig. 3 einen gegen den Düsenanbausatz von Fig. 2 austauschbaren zweiten Düsenanbausatz für ein Airless-Zerstäubungsverfahren mit zusätzlicher Zerstäuberluft,
  • Fig. 4 einen gegen die Düsenanbausätze von Fig. 2 und 3 austauschbaren dritten Düsenanbausatz für ein Airless-Zerstäubungsverfahren,
  • Fig. 5 einen Längsschnitt einer Spritzpistole nach der Erfindung für pulverförmiges Beschichtungsmaterial mit einem Düsenanbausatz für ein prallplattenloses Pulverzerstäubungsverfahren, und
  • Fig. 6 die in Fig. 5 dargestellte Spritzpistole, bei welcher jedoch der Düsenanbausatz durch einen Düsenanbausatz zur Pulverzerstäubung durch eine das Pulver ablenkende Prallplatte nach dem Prallplattenzerstäubungsverfahren ausgetauscht wurde.
The invention is described below using several embodiments with reference to drawings. In it show:
  • 1 shows a longitudinal section of a spray gun according to the invention for liquid coating material, but without a nozzle attachment kit,
  • 2 shows the connection end of a housing of the spray gun from FIG. 1 with a nozzle attachment kit for a compressed air atomization method to be connected to it, shown opposite.
  • 3 shows a second nozzle attachment kit that can be exchanged for the nozzle attachment kit of FIG. 2 for an airless atomization process with additional atomizing air,
  • 4 shows a third nozzle attachment kit for an airless atomization process that can be exchanged for the nozzle attachment kit of FIGS. 2 and 3,
  • 5 shows a longitudinal section of a spray gun according to the invention for powdered coating material with a nozzle attachment kit for a powder atomization process without a baffle plate, and
  • 6 shows the spray gun shown in FIG. 5, in which, however, the nozzle attachment kit was replaced by a nozzle attachment kit for powder atomization by a baffle plate deflecting the powder according to the baffle plate atomization method.

Fig. 1 zeigt eine Spritzpistole ohne Düsenanbausatz an ihrem stromabwärtigen Anschlußende 2 eines Gehäuses 4. Durch das Gehäuse 4 führt von einem Einlaß 6 ein Beschichtungsmaterialkanal 8 zum stromabwärtigen Anschlußende 2. Ferner führt durch einen Pistolengriff 9 ein Einlaßkanal 10, welcher über zwei Gaskanäle 12 und 14 des Gehäuses 4 jeweils ebenfalls mit dem stromabwärtigen Anschlußende 2 in Verbindung steht. Ein Hebel 16 betätigt ein Ventil 18 im Einlaßkanal 10 und ein Betätigungsorgan 20 für ein weiteres Ventil eines Düsenanbausatzes, welcher am Anschlußende 2 angeschlossen werden kann. Das letztgenannte weitere Ventil versperrt oder öffnet den Strömungsweg des Beschichtungsmaterials vom Beschichtungsmaterialkanal 8 durch den betreffenden Düsenanbausatz. Im Gaskanal 14 befindet sich eine einstellbare und auch verschließbare Strömungsdrossel 22. Das Anschlußende 2 ist so ausgebildet, daß die daran angepaßten Düsenanbausätze nur aus wenigen Bauteilen bestehen, obwohl sie zusammen mit der Spritzpistole jeweils nach verschiedenen Zerstäubungsverfahren arbeitende Zerstäuber bilden.1 shows a spray gun without a nozzle attachment kit at its downstream connection end 2 of a housing 4. Through the housing 4, a coating material channel 8 leads from an inlet 6 to the downstream connection end 2. Furthermore, an inlet channel 10 leads through a pistol grip 9, which via two gas channels 12 and 14 of the housing 4 is also in each case connected to the downstream connection end 2. A lever 16 actuates a valve 18 in the inlet duct 10 and an actuating member 20 for a further valve of a nozzle attachment kit, which can be connected to the connection end 2. The latter further valve blocks or opens the flow path of the coating material from the coating material channel 8 through the relevant nozzle attachment kit. In the gas channel 14 there is an adjustable and also lockable flow restrictor 22. The connection end 2 is designed so that the nozzle attachment kits which are adapted to it consist of only a few components, although together with the spray gun they are each ver form different atomization processes working atomizers.

Der Düsenanbausatz 30 von Fig. 2 besteht aus einem an das Betätigungsorgan 20 anschraubbaren Ventilkörper 32 in Form einer Ventilnadel, einem koaxial zu ihr in ein Innengewinde 34 des Anschlußendes 2 einschraubbaren Düsenkörper 36 mit innerem Ventilsitz 38 für den Ventilkörper 32, und einer die beiden Teile 32 und 36 übergreifenden Zerstäuberluftkappe 40, die koaxial zu ihnen mit einem Innengewinde 42 auf ein Außengewinde 44 des Anschlußendes 2 schraubbar ist. Wenn der Düsenanbausatz 30 an das Anschlußende 2 angeschraubt ist, kann bei Betätigung des Hebels 16 Beschichtungsmaterial vom Kanal 8 über das Ventil 32, 38 durch den Düsenkörper 36 hindurch ausströmen, und es kann Zerstäuberluft vom Gaskanal 12 über Bohrungen 46 und 48 des Düsenkörpers 36 und der Zerstäuberluftkappe 40 austreten, und es kann außerdem Zusatzluft vom Gaskanal 14 über Kanäle 50 in Hörnern 52 der Zerstäuberluftkappe 40 austreten. Der Düsenanbausatz 30 ermöglicht zusammen mit der Spritzpistole ein Versprühen des Beschichtungsmaterials nach dem Luftzerstäubungsverfahren. Elektroden 53 an der Kappe 40 laden das Beschichtungsmaterial elektrostatisch auf. Der Düsenanbausatz 30 von Fig. 2 kann gegen einen Düsenanbausatz 60 von Fig. 3 ausgetauscht werden. Dieser besteht aus einem am Betätigungsorgan 20 anschraubbaren Ventilkörper 62 mit einer Ventilkugel, einem in das Innengewinde 34 des Anschlußendes 2 einschraubbaren Ventilsitz 64 für diesen Ventilkörper, und einer Düsenkappe 66 mit Innengewinde 42 zum Schrauben auf das Außengewinde 44 des Anschlußendes 2. Wenn der Düsenanbausatz am Anschlußende 2 angeschraubt ist, kann bei Betätigung des Hebels 16 von Fig. 1 Beschichtungsmaterial vom Kanal 8 über das Ventil 62, 64 durch eine Zerstäuberdüse 68 austreten, welche axial in die Düsenkappe 66 eingeschraubt ist und aufgrund der besonderen, jedoch bekannten Form ihrer Düsenmündung 70 eine Zerstäubung des Beschichtungsmaterials nach dem Airless-Zerstäubungsverfahren bewirkt. Zusätzlich kann vom Gaskanal 14 über Kanäle 72 der Zerstäuberdüse 68 Zusatzluft in die Düsenmündung 70 austreten, welche die Zerstäubung des Beschichtungsmaterials unterstützt.2 consists of a valve body 32 which can be screwed onto the actuating member 20 in the form of a valve needle, a nozzle body 36 which can be screwed coaxially to it into an internal thread 34 of the connection end 2 and an inner valve seat 38 for the valve body 32, and one of the two parts 32 and 36 overlapping atomizer air cap 40, which can be screwed coaxially to them with an internal thread 42 onto an external thread 44 of the connection end 2. If the nozzle attachment kit 30 is screwed onto the connection end 2, coating material can flow out of the channel 8 via the valve 32, 38 through the nozzle body 36 when the lever 16 is actuated, and atomizing air can flow from the gas channel 12 via bores 46 and 48 of the nozzle body 36 and of the atomizer air cap 40, and additional air can also escape from the gas channel 14 via channels 50 in horns 52 of the atomizer air cap 40. The nozzle attachment kit 30, together with the spray gun, enables the coating material to be sprayed using the air atomization method. Electrodes 53 on the cap 40 electrostatically charge the coating material. The nozzle attachment kit 30 of FIG. 2 can be exchanged for a nozzle attachment kit 60 of FIG. 3. This consists of a valve body 62 which can be screwed onto the actuating member 20 and has a valve ball, a valve seat 64 which can be screwed into the internal thread 34 of the connection end 2 for this valve body, and a nozzle cap 66 with an internal thread 42 for screwing onto the external thread 44 of the connection end 2. If the nozzle attachment kit is on Connection end 2 1, coating material can escape from the channel 8 via the valve 62, 64 through an atomizing nozzle 68 which is screwed axially into the nozzle cap 66 and, because of the special but known shape of its nozzle mouth 70, atomization when the lever 16 of FIG. 1 is actuated of the coating material after the airless atomization process. In addition, additional air can escape from the gas channel 14 via channels 72 of the atomizing nozzle 68 into the nozzle mouth 70, which supports the atomization of the coating material.

Die Düsenanbausätze 30 und 60 können gegen einen Düsenanbausatz 80 von Fig. 4 ausgetauscht werden. Dieser ist nahezu identisch mit dem Düsenanbausatz 60 von Fig. 2, weshalb einander baulich entsprechende Teile mit gleichen Bezugszahlen versehen sind und die gleiche Funktion haben. Der einzige Unterschied besteht darin, daß anstelle der Zerstäuberdüse 68 eine Zerstäuberdüse 82 in die Düsenkappe 66 eingesetzt ist. Die Zerstäuberdüse 82 hat keine Gaskanäle. Es wird keine Luft an die Spritzpistole, Kanal 10, angeschlossen. Strömungsdrossel 22 kann geschlossen werden. Die Zerstäubung des Beschichtungsmaterials erfolgt nach dem Airless-Zerstäubungsverfahren ohne zusätzliche Luft.The nozzle attachment kits 30 and 60 can be exchanged for a nozzle attachment kit 80 from FIG. 4. This is almost identical to the nozzle attachment kit 60 from FIG. 2, which is why structurally corresponding parts are provided with the same reference numbers and have the same function. The only difference is that instead of the atomizer nozzle 68, an atomizer nozzle 82 is inserted into the nozzle cap 66. The atomizing nozzle 82 has no gas channels. No air is connected to the spray gun, channel 10. Flow restrictor 22 can be closed. The coating material is atomized using the airless atomization process without additional air.

Die Spritzpistole der Fig. 5 und 6 dient zum Sprühen von pulverförmigem Beschichtungsmaterial auf Gegenstände. Sie ist rohrförmig und enthält einen Grundkörper 102, ein auswechselbar aufgestecktes Zwischenstück 104 und entsprechend Fig. 5 einen auf letzteres aufsteckbaren Düsenanbausatz 106, der gegen einen Düsenanbausatz 108 entsprechend Fig. 6 austauschbar ist. Durch den Grundkörper 102 und das Zwischenstück 104 führt axial ein Beschichtungsmaterialkanal 110 hindurch, der im Düsenanbausatz 106 oder 108 ausmündet. Der Düsenanbausatz 106 von Fig. 5 zerstäubt das pulverförmige Beschichtungsmaterial dadurch, daß der Materialstrom mit einer Düsenmündungswand 112 einen Unterdruck nach dem Coandaeffekt erzeugt, durch welchen der Materialstrom radial auseinandergerissen wird. Die Zerstäubung wird durch Zerstäuberluft unterstützt, welche von einer externen Druckluftquelle 114 über ein Absperrventil 116 einem Gaskanal 118 der Spritzpistole zugeführt wird und über einen Auslaß 120 in eine Düsenmündung 121 strömt. Die Zerstäubung erfolgt nach dem bekannten prallplattenlosen Zerstäubungsverfahren. Elektrische Leitungen 122 sind mit Elektroden 124 verbunden, welche im Materialkanal 110 angeordnet sind und das Beschichtungsmaterial elektrostatisch aufladen. Eine weitere Gasquelle 126 liefert über ein Ansperrventil 128 Druckluft an einen weiteren Gaskanal 130, von welchem es über eine Ringspaltdüse 132 austritt und einen das zerstäubte Beschichtungsmaterial einhüllenden Gasmantel bildet. Abweichend hiervon verschließt der Düsenanbausatz 108 von Fig. 6 die Gaskanäle 118 und 130 und die Zerstäubung des Beschichtungsmaterials wird durch einen Prallkörper 134 bewirkt, der im Strömungsweg des Beschichtungsmaterials stromabwärts einer Düsenwandung 136 angeordnet ist. Die Druckluftquellen 114 und 126 werden bei Verwendung des Düsenanbausatzes 108 von Fig. 6 nicht benötigt und können abgeschaltet werden. Beim Düsenanbausatz 108 von Fig. 6 erfolgt die Zerstäubung des pulverförmigen Beschichtungsmaterials durch seine Ablenkung am Prallkörper 134 nach dem bekannten Prallplatten- Zerstäubungsverfahren.The spray gun of FIGS. 5 and 6 is used to spray powder coating material onto objects. It is tubular and contains a base body 102, an interchangeably plugged-on intermediate piece 104 and, according to FIG. 5, a nozzle attachment kit 106 which can be plugged onto the latter and which bears against one 6 is interchangeable. A coating material channel 110 leads axially through the base body 102 and the intermediate piece 104 and opens into the nozzle attachment kit 106 or 108. 5 atomizes the powdery coating material in that the material flow creates a negative pressure after the Coanda effect with a nozzle orifice wall 112, by means of which the material flow is torn apart radially. The atomization is supported by atomizing air, which is supplied from an external compressed air source 114 via a shut-off valve 116 to a gas channel 118 of the spray gun and flows through an outlet 120 into a nozzle mouth 121. The atomization takes place according to the known baffle plate-free atomization process. Electrical lines 122 are connected to electrodes 124, which are arranged in the material channel 110 and electrostatically charge the coating material. Another gas source 126 provides a Ans p errventil 128 compressed air to a further gas passage 130 from which it exits through an annular die 132 and forms an enveloping the atomized coating material gas jacket. 6, the gas channels 118 and 130 are closed and the atomization of the coating material is effected by an impact body 134 which is arranged in the flow path of the coating material downstream of a nozzle wall 136. The compressed air sources 114 and 126 are not required when using the nozzle attachment kit 108 from FIG. 6 and can be switched off. In the nozzle attachment kit 108 of FIG. 6, the powdery coating material is atomized by its deflection on Impact body 134 according to the known baffle plate atomization process.

Claims (3)

1. Spritzpistole für Beschichtungsmaterial, mit einem Gehäuse, in welchem sich mindestens ein Kanal für Beschichtungsmaterial und mindestens ein Kanal für Gas befinden, die zu einem Anschlußende des Gehäuses führen, an welchem ein Düsenanbausatz befestigbar ist, durch welchen das Beschichtungsmaterial versprüht wird,
dadurch gekennzeichnet , daß die Spritzpistole mit mehreren verschiedenen Düsenanbausätzen (30, 60, 80 bzw. 106, 108) einen Bausatz bildet, bei welchem wahlweise je einer der verschiedenen Düsenanbausätze lösbar am Anschlußende (2) des Gehäuses (4 bzw. 102, 104) der Spritzpistole befestigbar ist, und jeder Düsenanbausatz zusammen mit der Spritzpistole einen nach einem anderen Zerstäubungsverfahren arbeitenden Zerstäuber bildet, insbesondere für flüssige Beschichtungsmaterialien je einen Zerstäuber für a) Druckluftzerstäubungsverfahren, b) Airless-Zerstäubungsverfahren und c) Airless-Zerstäubungsverfahren mit zusätzlicher Zerstäuberluft,
oder für pulverförmige Beschichtungsmaterialien je einen Zerstäuber für d) Prallplatten-Zerstäubungsverfahren und e) Prallplattenloses Zerstäubungsverfahren. 1. Spray gun for coating material, with a housing in which there are at least one channel for coating material and at least one channel for gas, which lead to a connection end of the housing, to which a nozzle attachment kit can be fastened, through which the coating material is sprayed,
characterized in that the spray gun forms a kit with several different nozzle attachment kits (30, 60, 80 or 106, 108), in which either one of the different nozzle attachment kits can be detachably attached to the connection end (2) of the housing (4 or 102, 104) the spray gun can be fastened, and each nozzle attachment kit, together with the spray gun, forms an atomizer operating according to a different atomization method, in particular for liquid coating materials, one atomizer each a) compressed air atomization process, (b) airless spraying and c) airless atomization process with additional atomizing air,
or an atomizer for powder coating materials d) baffle plate atomization process and e) Baffle-less atomization process. 2. Spritzpistole nach Anspruch 1,
dadurch gekennzeichnet , daß a) ein Düsenanbausatz (30) für ein Druckluftzerstäubungsverfahren eine Zerstäuberluftkappe (40) mit Anschlußstück (42) zur Spritzpistole sowie eine Düse (36) und ein Ventil (32, 38) für das Beschichtungsmaterial aufweist, b) der Düsenanbausatz (80) für das Airless-Zerstäubungsverfahren eine Düsenkappe (66) und ein Ventil (62, 64) für das Beschichtungsmaterial aufweist, und c) der Düsenanbausatz (60) für das Airless-Zerstäubungsverfahren mit zusätzlicher Zerstäuberluft eine Düsenkappe (66) mit Zerstäuberluftkanälen (72) und ein Ventil (62,64) für das Beschichtungsmaterial aufweist/sowie d) die Spritzpistole mit einer Betätigungsvorrichtung (16,20) zur Betätigung des Ventils des jeweiligen Düsenanbausatzes versehen ist. 2. Spray gun according to claim 1,
characterized in that a) a nozzle attachment kit (30) for a compressed air atomization process has an atomizer air cap (40) with connection piece (42) to the spray gun as well as a nozzle (36) and a valve (32, 38) for the coating material, b) the nozzle attachment kit (80) for the airless atomization method has a nozzle cap (66) and a valve (62, 64) for the coating material, and c) the nozzle attachment kit (60) for the airless atomization process with additional atomizing air has a nozzle cap (66) with atomizing air channels (72) and a valve (62, 64) for the coating material / and d) the spray gun is provided with an actuating device (16, 20) for actuating the valve of the respective nozzle attachment kit. 3. Spritzpistole nach Anspruch 1 oder 2,
dadurch gekennzeichnet , daß mindestens einer der Düsenanbausätze (30) mit mindestens einer Elektrode (53) zur elektrostatischen Aufladung des Beschichtungsmaterials versehen ist.3. Spray gun according to claim 1 or 2,
characterized in that at least one of the nozzle attachment kits (30) is provided with at least one electrode (53) for electrostatically charging the coating material.
EP85116536A 1985-02-01 1985-12-23 Spray pistol for coating material Withdrawn EP0192854A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3503384A DE3503384C1 (en) 1985-02-01 1985-02-01 Spray gun for coating material
DE3503384 1985-02-01

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EP0192854A1 true EP0192854A1 (en) 1986-09-03

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US (1) US4702420A (en)
EP (1) EP0192854A1 (en)
JP (1) JPS61178054A (en)
DE (1) DE3503384C1 (en)
ES (1) ES292061Y (en)

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US4702420A (en) 1987-10-27
ES292061Y (en) 1987-02-01
ES292061U (en) 1986-05-16
DE3503384C1 (en) 1986-04-17
JPS61178054A (en) 1986-08-09

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