EP2380667B1 - Spray gun - Google Patents

Spray gun Download PDF

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Publication number
EP2380667B1
EP2380667B1 EP11003279.4A EP11003279A EP2380667B1 EP 2380667 B1 EP2380667 B1 EP 2380667B1 EP 11003279 A EP11003279 A EP 11003279A EP 2380667 B1 EP2380667 B1 EP 2380667B1
Authority
EP
European Patent Office
Prior art keywords
liquid
compressed air
spray gun
valve
jacket tube
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
EP11003279.4A
Other languages
German (de)
French (fr)
Other versions
EP2380667A1 (en
Inventor
Andreas Hutt
Friedrich Baur
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.)
Heupel Reinigungstechnik GmbH
Original Assignee
Heupel Reinigungstechnik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heupel Reinigungstechnik GmbH filed Critical Heupel Reinigungstechnik GmbH
Publication of EP2380667A1 publication Critical patent/EP2380667A1/en
Application granted granted Critical
Publication of EP2380667B1 publication Critical patent/EP2380667B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/2405Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle
    • B05B7/2435Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device using an atomising fluid as carrying fluid for feeding, e.g. by suction or pressure, a carried liquid from the container to the nozzle the carried liquid and the main stream of atomising fluid being brought together by parallel conduits placed one inside the other
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B3/00Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements
    • B05B3/02Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements
    • B05B3/04Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet
    • B05B3/06Spraying or sprinkling apparatus with moving outlet elements or moving deflecting elements with rotating elements driven by the liquid or other fluent material discharged, e.g. the liquid actuating a motor before passing to the outlet by jet reaction, i.e. creating a spinning torque due to a tangential component of the jet
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02Spray pistols; Apparatus for discharge
    • B05B7/12Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1209Spray 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
    • B05B7/1218With means for adjusting or modifying the action of the controlling means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/02Spray pistols; Apparatus for discharge
    • B05B7/12Spray pistols; Apparatus for discharge designed to control volume of flow, e.g. with adjustable passages
    • B05B7/1209Spray 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
    • B05B7/1245A gas valve being opened before a liquid valve
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B05SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05BSPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/24Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas with means, e.g. a container, for supplying liquid or other fluent material to a discharge device
    • B05B7/2402Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device
    • B05B7/2467Apparatus to be carried on or by a person, e.g. by hand; Apparatus comprising containers fixed to the discharge device a liquid being fed by a pressure generated in the container, which is not produced by a carrying fluid

Definitions

  • the invention relates to a spray gun for spraying a liquid by means of compressed air according to the preamble of patent claim 1.
  • Spray guns for spraying a liquid by means of compressed air are known in a variety of different embodiments.
  • One embodiment form spray guns, in which the liquid to be sprayed is sucked in, for example, from a liquid container arranged on the spray gun by the compressed air flowing past it (venturi principle) and exits the spray gun as a liquid / compressed air mixture.
  • the utility model originating from the applicant DE 20 2009 011 168 U1 shows a cleaning system for cleaning surfaces, wherein a spray gun connected to the cleaning device comprises means for metering the shipsstromvalumens and means for metering the cleaning liquid.
  • the disadvantage is that the supply of compressed air and the cleaning liquid to the spray gun via two separate dosing. To produce a compressed air / liquid mixture, the two means for metering must be operated or switched separately.
  • a non-closed metering valve in the liquid supply can lead to an uncontrolled leakage of cleaning fluid when the spray gun is out of service and is stored below the liquid level of a reservoir.
  • the invention has the object to improve the supply of compressed air and cleaning fluid for a spray gun.
  • the invention is based on a spray gun for spraying a liquid by means of compressed air, for example a cleaning liquid in a cleaning system. It comprises a housing with a funnel-shaped air outlet opening, means for generating a swirling flow in the air outlet opening, and means for metering the airflow volume and the liquid.
  • the essence of the invention is that the air flow and the liquid can be switched together by means of a two-stage metering valve.
  • the two-stage metering valve allows successive connection of the compressed air and the liquid with a common valve mechanism in one-hand operation.
  • Another advantage of the two-stage metering valve is the execution of cleaning processes with different cleaning media by a single spray gun, such as the cleaning and / or drying of a Surface only with compressed air and cleaning with a compressed air / liquid mixture.
  • an actuating means for the metering valve disposed on the housing is adapted to actuate the two-stage metering valve in a first stage with a compressed air operation and in a second stage with a compressed air / liquid operation.
  • the example designed as a trigger actuator is rotatably connected to the gun body. In the first stage, by pulling the trigger, the compressed air supply is opened by moving a body in the metering valve by releasing a compressed air channel. By further pulling the trigger then moves a dispensing needle over a stop and opens the liquid supply to the second stage.
  • compressed air operation of the spray gun a surface of coarse dirt particles can be cleaned. Dirt particles, which can not be removed from the surface by the compressed air operation, can often be released from the surface by subsequently connecting the liquid in the second stage of the metering valve.
  • the flow rate of the liquid can be limited.
  • the amount of liquid emerging from the metering valve can be limited by adjusting the stroke of the valve needle via a stop. By adjusting the position of the stop, the axial offset of the valve needle can be changed. As a result, when the metering valve is opened, the escape of excessively large quantities of fluid for cleaning moisture-sensitive surfaces, such as, for example, padding surfaces, can be avoided.
  • connection element with a pressure chamber is arranged on the gun body.
  • the compressed air supplied to the pressure chamber is sent to subsequent, air-conveying elements of the spray gun with reduced cross-sectional area forwarded. This increases the flow speed of the compressed air.
  • the liquid flows through a valve seat in a fluid hose.
  • the valve seat is arranged in a connecting element, which is connected within the pressure chamber with the gun body.
  • the connecting element is connected to a flexible fluid hose.
  • the pressure chamber is connected by means of a second adapter to a jacket hose which surrounds the fluid hose.
  • the compressed air can preferably be routed separately to the cleaning liquid up to the outlet end of the flexibly formed jacket tube, wherein the outlet end of the fluid tube is adapted to the outlet end of the jacket tube.
  • the pressure chamber has an annular supply of compressed air of the same pressure in the jacket tube.
  • the jacket tube is guided with the fluid hose running in the interior in means for generating a vortex flow.
  • the flexible fluid hose generates a circular in the operating state of the spray gun Rotational movement within a venturi due to the passing air flow in the jacket tube and the subsequent exit from the jacket tube. This rotational movement in turn generates a vortex flow which forms a negative pressure in its center in the region of a surface to be cleaned, whereby dirt particles are sucked away or led away from a surface to be cleaned.
  • an air / liquid mixture is formed at the end of the jacket tube.
  • the pending at the end of the fluid hose cleaning liquid is sucked by the exiting compressed air at the end of the jacket tube due to a high flow rate and mixes to a compressed air / liquid mixture, which is then available for cleaning purposes.
  • the two-stage metering valve forms a barrier to the liquid in the liquid supply line of the spray gun.
  • the liquid is supplied by the opening of a valve seat, such as a valve needle, wherein the pre-compressed air supply takes place for example by moving a sleeve.
  • Both media are supplied by pressing a common, two-stage metering valve in two consecutive operation steps of the spray gun and turned off in reverse order. As a result, a separate shut-off, such as a stopcock in the liquid supply is not required.
  • the FIG. 1 shows a spray gun 1, which includes a gun body 2, which is shown for clarity in a front gun body 2a and a rear gun body 2b divided.
  • the spray gun 1 is connected to a separate supply line for liquid 4 and 5 for compressed air.
  • a metering valve 6 is integrated with a dispensing needle 6 a, which is actuated by a trigger 3 rotatably mounted on the gun body 2.
  • the compressed air supply is activated by pulling the trigger 3 in the direction of the rear gun body 2b, wherein the position of the dispensing needle 6a remains unchanged (a detailed explanation of the compressed air supply takes place in the following description of FIG. 6 ).
  • the dispensing needle 6a performs a movement in the direction of the rear gun body 2b in a second operating stage, whereby a liquid supply in the metering valve 6 is released to the already activated compressed air supply.
  • an end cap 7 In the axial extension of the dispensing needle 6a is on the rear gun body 2b an end cap 7 by means of a thread arranged, which has a stop 29 in its interior.
  • the end cap 7 covers the rear end portion of the dispensing needle 6a, which projects beyond the outer surface of the rear gun body 2b.
  • One or more compression springs 8 arranged in the end cap 7 are guided over the end area of the metering needle 6a and form the required restoring force for the moving components.
  • a connecting element 10 is connected by means of a union nut 9 with a connecting thread 30 arranged on the front gun body 2 in the direction of flow of the fluids.
  • the union nut 9 engages for attachment to a collar 10 integrally formed collar collar 31st
  • the connecting element 10 has in the interior a pressure chamber 15 for receiving the compressed air. Furthermore, a connecting element 11 is connected by a thread with the front gun body 2 within the pressure chamber 15. The connecting element 11 has a valve seat 12 in the interior and together with the dispensing needle 6a, the essential elements of the metering valve 6 for the supply of liquid.
  • the connecting element 11 is connected to a first adapter 13, which serves for fastening a fluid hose 14.
  • the liquid is introduced via the open valve seat 12 and continued therein.
  • the connecting element 10 is connected in the flow direction of the compressed air with a second adapter 16 to which a jacket tube 17 is attached.
  • the jacket tube 17 is in communication with the pressure chamber 15 and is fed by this with compressed air.
  • the attached to the first adapter 13 fluid hose 14 passes through the second adapter 16 and is encompassed by the subsequent jacket tube 17.
  • the Compressed air in the jacket tube 17 is thereby guided separately from the liquid in the fluid tube 14.
  • the jacket tube 17 forms a circular compressed air supply due to the guided inside the fluid hose 14. At the same time, the speed of the compressed air is increased during the introduction into the jacket tube 17 due to the reduction of the free cross section.
  • a venturi 19 is arranged on the connection element 10 via a threaded connection, in which the fluid tube 14 and the jacket tube 17 enclosing the fluid tube 14 are guided into the region of the outlet opening of the venturi 19.
  • the fluid tube 14 and the jacket tube 17 perform in the operating state of the spray gun 1 from a circular rotational movement within the air hopper 19 due to the present high-pressure air flow. This rotational movement creates a kind of vortex flow, which causes a negative pressure in its center in the region of a surface to be cleaned, whereby dirt particles are released from a surface to be cleaned and sucked or carried away.
  • the jacket tube 17 has on its mantle surface a plurality of spaced-apart sleeves 18 in different lengths, which form the circular motion in the operating state of the spray gun 1 evenly or attenuate due to their weight and their elasticity.
  • FIG. 2 is a perspective view of the connection element 10 is shown, which is encompassed by the nut 9.
  • the adapter 10 is connected by means of the union nut 9 with the arranged on the front gun body 2a connecting thread 30.
  • a threaded pin 20 with an inner and outer thread is formed in the flow direction of the compressed air on the connection element 10.
  • In the internal thread of the threaded pin 20 of the adapter 16 is screwed for the jacket tube 17.
  • On the external thread of the threaded pin 20 of the air vent 19 is screwed.
  • the connection element 10 engages in its fastened arrangement on the front gun body 2a, the connecting element 11 with the internally formed valve seat 12 and the first adapter 13 for securing the fluid hose 14.
  • the venturi 19 is sealed by a seal 32 against the connecting element 10 to unwanted suction of foreign air in to avoid the venturi 19 during operation of the spray gun 1.
  • FIG. 3 the connecting element 11 is shown in a perspective view, wherein the connecting element 11 is connected in the flow direction via a connecting thread 33 with the first adapter 13.
  • the first adapter 13 is used for fastening the fluid hose 14 to the connecting element 11.
  • a connecting thread 21 for fastening the connecting element 11 to the front gun body 2 a is arranged on the end face of the connecting element 11 opposite the adapter 13.
  • the connecting element 11 has inside the valve seat 12 for the needle metering valve.
  • FIG. 4 the first adapter 13 for fastening the fluid hose 14 is shown, wherein the rear end of the first adapter 13 is screwed into the connecting thread 33 of the connecting element 11.
  • the fluid hose 14 later passes through the jacket hose 17 attached to the second adapter 16 to its end, preferably up to the outlet opening of the air funnel 19.
  • the second adapter 16 is shown for fastening the jacket tube 17, wherein the provided external thread is screwed into the internal thread of the threaded pin 20 on the connection element 10.
  • the jacket tube 17 has on its mantle surface a plurality of spaced apart sleeves 18 of different lengths, which during flow through the Damping compressed air and the cleaning liquid resulting circular motion and form uniformly.
  • the circular motion creates within the venturi 19 a vortex flow, which generates a negative pressure in its center, similar to a tornado flow, in the area of a surface to be cleaned. As a result, dirt particles can be released from the surface to be cleaned and removed.
  • FIG. 6 a detail view of a spray gun 1 is shown, in which a two-stage metering valve 6 is integrated.
  • the metering valve 6 comprises a metering needle 6a, which in the longitudinal direction at its front end in the conically shaped sealing surface of the valve seat 12 (see FIG. 1 ) seals.
  • the valve needle 6a is surrounded by a valve sleeve 22 movable thereon, which is guided in a channel 34 arranged in the pistol grip 2.
  • valve sleeve 22 rests with its pointing in the flow direction of the compressed air end on the back of the trigger 3.
  • the valve sleeve 22 is displaced on the valve needle 6a, which is held in position by a return spring.
  • a permanently connected to the valve sleeve 22 sealing collar 23 is moved together with the arranged thereon O-ring seal 27 behind a arranged in the direction of the gun body 2b supply line for compressed air 5 and gives the compressed air supply in the first operating stage of the metering valve 6 in an inner Compressed air channel free.
  • valve sleeve 22 The restoring force of the valve sleeve 22 via a compression spring 8, which is supported between a screwed-in channel 34 sleeve 29 and the sealing collar 23.
  • a compression spring 8 By further pulling the trigger 3 in the direction of the gun body 2b, the rear end of the sleeve 22 is pressed against a fixedly arranged on the valve needle pressure plate 25 and switches the liquid supply of the second operating stage of the metering valve 6, so the liquid supply to the compressed air free by the valve needle 6a is withdrawn.
  • valve needle 6a Upon discharge of the trigger 3, the valve needle 6a together with the valve sleeve 22 via the restoring force of the compression spring 8 and a further compression spring 35 for Valve needle 6a moved forward, first the liquid supply of the second operating stage of the metering valve 6 and subsequently the compressed air supply of the first operating stage via the valve sleeve 22 is turned off.
  • a cleaning of a surface with different media compressed air and compressed air-liquid mixture is possible, and it is a dripping of the cleaning liquid avoided when the compressed air is switched off.

Description

Die Erfindung betrifft eine Sprühpistole zum Versprühen einer Flüssigkeit mittels Druckluft nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a spray gun for spraying a liquid by means of compressed air according to the preamble of patent claim 1.

Stand der Technik:State of the art:

Sprühpistolen zum Versprühen einer Flüssigkeit mittels Druckluft sind in einer Vielzahl von unterschiedlichen Ausführungsformen bekannt. Eine Ausführungsform bilden Sprühpistolen, bei welchen die zu versprühende Flüssigkeit beispielsweise aus einem an der Sprühpistole angeordneten Flüssigkeitsbehälter von der vorbeiströmenden Druckluft angesaugt wird (Venturi-Prinzip) und als Flüssigkeits-/Druckluftgemisch aus der Sprühpistole austritt.Spray guns for spraying a liquid by means of compressed air are known in a variety of different embodiments. One embodiment form spray guns, in which the liquid to be sprayed is sucked in, for example, from a liquid container arranged on the spray gun by the compressed air flowing past it (venturi principle) and exits the spray gun as a liquid / compressed air mixture.

Das auf den Anmelder zurückgehende Gebrauchsmuster DE 20 2009 011 168 U1 zeigt eine Reinigungsanlage zur Reinigung von Oberflächen, wobei eine mit der Reinigungsanlage verbundene Sprühpistole Mittel zur Dosierung des Luftstromvalumens und Mittel zur Dosierung der Reinigungsflüssigkeit aufweist.The utility model originating from the applicant DE 20 2009 011 168 U1 shows a cleaning system for cleaning surfaces, wherein a spray gun connected to the cleaning device comprises means for metering the Luftstromvalumens and means for metering the cleaning liquid.

Nachteilig ist, dass die Zufuhr der Druckluft und der Reinigungsflüssigkeit zur Sprühpistole über zwei voneinander getrennte Dosiermittel erfolgt. Zur Erzeugung eines Druckluft-/Flüssigkeitsgemischs müssen die beiden Mittel zur Dosierung separat voneinander betätigt bzw. geschaltet werden.The disadvantage is that the supply of compressed air and the cleaning liquid to the spray gun via two separate dosing. To produce a compressed air / liquid mixture, the two means for metering must be operated or switched separately.

Weiterhin ist bei der Betätigung von getrennt voneinander angeordneten Dosiermitteln eine Zwei-Hand-Bedienung der Sprühpistole erforderlich.Furthermore, in the operation of separately arranged dosing a two-handed operation of the spray gun is required.

Darüber hinaus kann ein nicht geschlossenes Dosierventil in der Flüssigkeitszufuhr zu einem unkontrollierten Auslaufen der Reinigungsflüssigkeit führen, wenn die Sprühpistole außer Betrieb ist und unterhalb des Flüssigkeitsniveaus eines Vorratsbehälters abgelegt wird.In addition, a non-closed metering valve in the liquid supply can lead to an uncontrolled leakage of cleaning fluid when the spray gun is out of service and is stored below the liquid level of a reservoir.

Aus diesem Grunde hat sich die Erfindung die Aufgabe gestellt, die Zufuhr von Druckluft und Reinigungsflüssigkeit für eine Sprühpistole zu verbessern.For this reason, the invention has the object to improve the supply of compressed air and cleaning fluid for a spray gun.

Ausgehend von dem Oberbegriff des Patentanspruchs 1 wird die erfindungsgemäße Aufgabe durch die kennzeichnenden Merkmale des Patentanspruchs 1 gelöst.Based on the preamble of claim 1, the object of the invention is achieved by the characterizing features of claim 1.

Vorteilhafte Erweiterungen der Erfindung sind in den abhängigen Ansprüchen beschrieben.Advantageous extensions of the invention are described in the dependent claims.

Offenbarung der Erfindung:Disclosure of the invention:

Die Erfindung geht von einer Sprühpistole zum Versprühen einer Flüssigkeit mittels Druckluft, beispielsweise einer Reinigungsflüssigkeit bei einer Reinigungsanlage, aus. Sie umfasst ein Gehäuse mit einer trichterförmigen Luftaustrittsöffnung, Mittel zur Erzeugung einer Wirbel-Strömung in der Luftaustrittsöffnung, und Mittel zur Dosierung des Luftstromvolumens und der Flüssigkeit.The invention is based on a spray gun for spraying a liquid by means of compressed air, for example a cleaning liquid in a cleaning system. It comprises a housing with a funnel-shaped air outlet opening, means for generating a swirling flow in the air outlet opening, and means for metering the airflow volume and the liquid.

Der Kern der Erfindung liegt darin, dass der Luftstrom und die Flüssigkeit gemeinsam mittels eines zweistufigen Dosierventils schaltbar sind.The essence of the invention is that the air flow and the liquid can be switched together by means of a two-stage metering valve.

Das zweistufige Dosierventil ermöglicht ein nacheinander folgendes Zuschalten der Druckluft und der Flüssigkeit mit einem gemeinsamen Ventilmechanismus im Ein-Hand-Betrieb.The two-stage metering valve allows successive connection of the compressed air and the liquid with a common valve mechanism in one-hand operation.

Weiterer Vorteil des zweistufigen Dosierventils ist das Ausführen von Reinigungsvorgängen mit unterschiedlichen Reinigungsmedien durch lediglich eine Sprühpistole, wie beispielsweise das Reinigen und/oder das Trocknen einer Oberfläche nur mit Druckluft und das Reinigen mit einem Druckluft-/Flüssigkeitsgemisch.Another advantage of the two-stage metering valve is the execution of cleaning processes with different cleaning media by a single spray gun, such as the cleaning and / or drying of a Surface only with compressed air and cleaning with a compressed air / liquid mixture.

In einer bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass ein am Gehäuse angeordnetes Betätigungsmittel für das Dosierventil dazu geeignet ist, das zweistufige Dosierventil in einer ersten Stufe mit einem Druckluftbetrieb und in einer zweiten Stufe mit einem Druckluft-/Flüssigkeitsbetrieb zu betätigen.
Das beispielsweise als Abzug ausgebildete Betätigungsmittel ist drehgelagert mit dem Pistolenkörper verbunden. In der ersten Stufe wird durch Ziehen des Abzugs die Druckluftzufuhr durch Verschieben eines Körpers im Dosierventil geöffnet, indem ein Druckluftkanal freigegeben wird. Durch weiteres Ziehen des Abzugs verschiebt sich sodann auch eine Dosiernadel über einen Anschlag und öffnet die Flüssigkeitszufuhr der zweiten Stufe. Im Druckluftbetrieb der Sprühpistole kann eine Reinigung einer Oberfläche von groben Schmutzpartikeln erfolgen. Schmutzpartikel, welche sich durch den Druckluftbetrieb nicht von der Oberfläche entfernen lassen, können oftmals durch nachfolgendes Zuschalten der Flüssigkeit in der zweiten Stufe des Dosierventils von der Oberfläche gelöst werden.
In a preferred embodiment of the invention, it is provided that an actuating means for the metering valve disposed on the housing is adapted to actuate the two-stage metering valve in a first stage with a compressed air operation and in a second stage with a compressed air / liquid operation.
The example designed as a trigger actuator is rotatably connected to the gun body. In the first stage, by pulling the trigger, the compressed air supply is opened by moving a body in the metering valve by releasing a compressed air channel. By further pulling the trigger then moves a dispensing needle over a stop and opens the liquid supply to the second stage. In compressed air operation of the spray gun, a surface of coarse dirt particles can be cleaned. Dirt particles, which can not be removed from the surface by the compressed air operation, can often be released from the surface by subsequently connecting the liquid in the second stage of the metering valve.

In einer überdies bevorzugten Ausgestaltung der Erfindung ist vorgesehen, dass die Durchflussmenge der Flüssigkeit begrenzbar ist. Die aus dem Dosierventil austretende Flüssigkeitsmenge kann durch Einstellung des Hubweges der Ventilnadel über einen Anschlag begrenzt werden. Durch Einstellen der Position des Anschlages kann der axiale Versatz der Ventilnadel verändert werden. Dadurch kann beim Öffnen des Dosierventils ein Austritt einer zu großen Flüssigkeitsmenge zur Reinigung von feuchtigkeitsempfindlichen Oberflächen, wie zum Beispiel Polsteroberflächen vermieden werden.In a further preferred embodiment of the invention it is provided that the flow rate of the liquid can be limited. The amount of liquid emerging from the metering valve can be limited by adjusting the stroke of the valve needle via a stop. By adjusting the position of the stop, the axial offset of the valve needle can be changed. As a result, when the metering valve is opened, the escape of excessively large quantities of fluid for cleaning moisture-sensitive surfaces, such as, for example, padding surfaces, can be avoided.

Erfindungsgemäß ist am Pistolenkörper ein Anschlusselement mit einer Druckkammer angeordnet. Die der Druckkammer zugeführte Druckluft wird an nachfolgende, druckluftführende Elemente der Sprühpistole mit verringerter Querschnittsfläche weitergeleitet. Dadurch wird die Fliessgeschwindigkeit der Druckluft erhöht.According to the invention, a connection element with a pressure chamber is arranged on the gun body. The compressed air supplied to the pressure chamber is sent to subsequent, air-conveying elements of the spray gun with reduced cross-sectional area forwarded. This increases the flow speed of the compressed air.

Überdies ist es in einer bevorzugten Ausführung der Erfindung vorgesehen, dass die Flüssigkeit über einen Ventilsitz in einen Fluidschlauch fließt. Der Ventilsitz ist in einem Verbindungselement angeordnet, welches innerhalb der Druckkammer mit dem Pistolenkörper verbunden ist. In Fliessrichtung ist das Verbindungselement mit einem flexiblen Fluidschlauch verbunden. Durch die Einleitung der Flüssigkeit in den flexibel ausgebildeten Fluidschlauch wird diese getrennt zur Druckluft weitergeführt, wodurch die Position der Vermischung der Flüssigkeit mit der Druckluft variabel durch die Schlauchlänge bestimmbar ist.Moreover, it is provided in a preferred embodiment of the invention that the liquid flows through a valve seat in a fluid hose. The valve seat is arranged in a connecting element, which is connected within the pressure chamber with the gun body. In the direction of flow, the connecting element is connected to a flexible fluid hose. By introducing the liquid into the flexibly formed fluid hose, it is separated from the compressed air, whereby the position of the mixing of the liquid with the compressed air can be variably determined by the hose length.

Erfindungsgemäß ist die Druckkammer mittels eines zweiten Adapters mit einem Mantelschlauch verbunden der den Fluidschlauch umgibt. Die Druckluft kann vorzugsweise bis zum Austrittsende des flexibel ausgebildeten Mantelschlauches getrennt zur Reinigungsflüssigkeit geführt werden, wobei das Austrittsende des Fluidschlauches dem Austrittsende des Mantelschlauches angepasst ist.According to the invention, the pressure chamber is connected by means of a second adapter to a jacket hose which surrounds the fluid hose. The compressed air can preferably be routed separately to the cleaning liquid up to the outlet end of the flexibly formed jacket tube, wherein the outlet end of the fluid tube is adapted to the outlet end of the jacket tube.

Es ist in einer weiteren, bevorzugten Ausgestaltung der Erfindung vorgesehen, dass die Druckkammer eine kreisringförmige Zufuhr der Druckluft gleichen Druckes in den Mantelschlauch aufweist. Durch eine kreisringförmige Zufuhr der Druckluft können Druckschwankungen in der weiterführenden Druckluft und somit auch im Druckluft-/Flüssigkeitsgemische während des Reinigungsvorgangs vermieden werden.It is provided in a further preferred embodiment of the invention that the pressure chamber has an annular supply of compressed air of the same pressure in the jacket tube. By an annular supply of compressed air pressure fluctuations in the continuing compressed air and thus in the compressed air / liquid mixtures can be avoided during the cleaning process.

Überdies ist in einer weiteren Ausgestaltung der Erfindung vorgesehen, dass der Mantelschlauch mit dem im Inneren verlaufenden Fluidschlauch in Mitteln zur Erzeugung einer Wirbel-Strömung geführt ist. Der flexible Fluidschlauch erzeugt im Betriebszustand der Sprühpistole eine kreisförmige Rotationsbewegung innerhalb eines Lufttrichters aufgrund des vorbeiströmenden Luftstroms im Mantelschlauch und dem nachfolgenden Austritt aus dem Mantelschlauch. Diese Rotationsbewegung erzeugt wiederum eine Wirbel-Strömung, die in ihrem Zentrum im Bereich einer zu reinigenden Oberfläche einen Unterdruck bildet, wodurch Schmutzpartikel von einer zu reinigenden Oberfläche absaugt bzw. wegführt werden.Moreover, in a further embodiment of the invention, it is provided that the jacket tube is guided with the fluid hose running in the interior in means for generating a vortex flow. The flexible fluid hose generates a circular in the operating state of the spray gun Rotational movement within a venturi due to the passing air flow in the jacket tube and the subsequent exit from the jacket tube. This rotational movement in turn generates a vortex flow which forms a negative pressure in its center in the region of a surface to be cleaned, whereby dirt particles are sucked away or led away from a surface to be cleaned.

Es ist in einer weiteren, bevorzugten Ausgestaltung der Erfindung vorgesehen, dass ein Luft-/Flüssigkeitsgemisch am Ende des Mantelschlauchs gebildet wird. Die am Ende des Fluidschlauches anstehende Reinigungsflüssigkeit wird durch die austretende Druckluft am Ende des Mantelschlauchs aufgrund einer hohen Strömungsgeschwindigkeit angesaugt und vermischt sich zu einem Druckluft-/Flüssigkeitsgemisch, welches sodann zu Reinigungszwecken zur Verfügung steht.It is provided in a further preferred embodiment of the invention that an air / liquid mixture is formed at the end of the jacket tube. The pending at the end of the fluid hose cleaning liquid is sucked by the exiting compressed air at the end of the jacket tube due to a high flow rate and mixes to a compressed air / liquid mixture, which is then available for cleaning purposes.

Überdies ist es in einer weiteren Ausgestaltung der Erfindung vorgesehen, dass das zweistufige Dosierventil eine Absperrung der Flüssigkeit in der Flüssigkeitszuleitung der Sprühpistole ausbildet. Die Flüssigkeitszufuhr erfolgt durch das Öffnen eines Ventilsitzes, beispielsweise einer Ventilnadel, wobei die vorab Druckluftzufuhr beispielsweise durch das Verschieben einer Hülse erfolgt. Beide Medien werden durch Betätigen eines gemeinsamen, zweistufigen Dosierventils in zwei aufeinander folgenden Betätigungsschritten der Sprühpistole zugeführt und in umgekehrter Reihenfolge abgeschaltet. Dadurch ist eine separate Absperrung, wie zum Beispiel ein Absperrhahn in der Flüssigkeitszuleitung nicht erforderlich.Moreover, it is provided in a further embodiment of the invention that the two-stage metering valve forms a barrier to the liquid in the liquid supply line of the spray gun. The liquid is supplied by the opening of a valve seat, such as a valve needle, wherein the pre-compressed air supply takes place for example by moving a sleeve. Both media are supplied by pressing a common, two-stage metering valve in two consecutive operation steps of the spray gun and turned off in reverse order. As a result, a separate shut-off, such as a stopcock in the liquid supply is not required.

Weitere Merkmale der Erfindung gehen aus der nachfolgenden Figurenbeschreibung des Ausführungsbeispiels und den Zeichnungen hervor.Further features of the invention will become apparent from the following description of the figures of the embodiment and the drawings.

Dabei zeigen:

Figur 1:
eine Seitenansicht einer Sprühpistole, teilweise im Schnitt;
Figur 2:
eine perspektivische Darstellung eines Anschlusselements;
Figur 3:
eine perspektivische Darstellung eines Verbindungselementes;
Figur 4:
eine perspektivische Darstellung eines Adapters mit Fluidschlauch;
Figur 5:
eine perspektivische Darstellung eines Adapters mit Mantelschlauch;
Figur 6:
eine schematische Darstellung eines zweistufigen Dosierventils in einer Sprühpistole in Schließstellung.
Showing:
FIG. 1:
a side view of a spray gun, partly in section;
FIG. 2:
a perspective view of a connection element;
FIG. 3:
a perspective view of a connecting element;
FIG. 4:
a perspective view of an adapter with fluid hose;
FIG. 5:
a perspective view of an adapter with jacket tube;
FIG. 6:
a schematic representation of a two-stage metering valve in a spray gun in the closed position.

Die Figur 1 zeigt eine Sprühpistole 1, die einen Pistolenkörper 2 umfasst, welcher zur verbesserten Übersicht in einen vorderen Pistolenkörper 2a und einen hinteren Pistolenkörper 2b unterteilt dargestellt ist. Die Sprühpistole 1 ist mit jeweils einer separaten Zuleitung für Flüssigkeit 4 und für Druckluft 5 verbunden. In dem Pistolenkörper 2 ist ein Dosierventil 6 mit einer Dosiernadel 6a integriert, das durch einen am Pistolenkörper 2 drehgelagerten Abzug 3 betätigt wird. In einer ersten Betriebsstufe des Dosierventils 6 wird durch Ziehen des Abzugs 3 in Richtung des hinteren Pistolenkörpers 2b die Druckluftzufuhr aktiviert, wobei die Position der Dosiernadel 6a noch unverändert bleibt (eine detaillierte Erläuterung der Druckluftzufuhr erfolgt in nachfolgender Beschreibung zur Figur 6). Durch weiteres Ziehen des Abzugs 3 führt die Dosiernadel 6a in einer zweiten Betriebsstufe eine Bewegung in Richtung des hinteren Pistolenkörpers 2b aus, wodurch eine Flüssigkeitszufuhr im Dosierventil 6 zur bereits aktivierten Druckluftzufuhr freigegeben wird.The FIG. 1 shows a spray gun 1, which includes a gun body 2, which is shown for clarity in a front gun body 2a and a rear gun body 2b divided. The spray gun 1 is connected to a separate supply line for liquid 4 and 5 for compressed air. In the gun body 2, a metering valve 6 is integrated with a dispensing needle 6 a, which is actuated by a trigger 3 rotatably mounted on the gun body 2. In a first stage of operation of the metering valve 6, the compressed air supply is activated by pulling the trigger 3 in the direction of the rear gun body 2b, wherein the position of the dispensing needle 6a remains unchanged (a detailed explanation of the compressed air supply takes place in the following description of FIG. 6 ). By further pulling the trigger 3, the dispensing needle 6a performs a movement in the direction of the rear gun body 2b in a second operating stage, whereby a liquid supply in the metering valve 6 is released to the already activated compressed air supply.

In axialer Verlängerung zur Dosiernadel 6a ist am hinteren Pistolenkörper 2b eine Endkappe 7 mittels einem Gewinde angeordnet, die in ihrem Innenraum einen Anschlag 29 aufweist. Die Endkappe 7 überdeckt den hinteren Endbereich der Dosiernadel 6a, welche die äußere Oberfläche des hinteren Pistolenkörpers 2b überragt. Durch Drehen der Endkappe 7 auf dem Gewinde kann die Position des Anschlags 29 verändert werden, wodurch der mögliche Hubweg der Dosiernadel 6a begrenzt wird. Eine oder mehrere in der Endkappe 7 angeordnete Druckfedern 8 ist über den Endbereich der Dosiernadel 6a geführt und bildet die erforderliche Rückstellkraft für die bewegten Bauteile aus.In the axial extension of the dispensing needle 6a is on the rear gun body 2b an end cap 7 by means of a thread arranged, which has a stop 29 in its interior. The end cap 7 covers the rear end portion of the dispensing needle 6a, which projects beyond the outer surface of the rear gun body 2b. By turning the end cap 7 on the thread, the position of the stop 29 can be changed, whereby the possible stroke of the dispensing needle 6a is limited. One or more compression springs 8 arranged in the end cap 7 are guided over the end area of the metering needle 6a and form the required restoring force for the moving components.

Am vorderen Pistolenkörper 2a ist in Fließrichtung der Fluide ein Anschlusselement 10 mittels einer Überwurfmutter 9 mit einem am vorderen Pistolenkörper 2 angeordneten Anschlussgewinde 30 verbunden. Die Überwurfmutter 9 umgreift zur Befestigung einen am Anschlusselement 10 angeformten Kragenbund 31.At the front gun body 2a, a connecting element 10 is connected by means of a union nut 9 with a connecting thread 30 arranged on the front gun body 2 in the direction of flow of the fluids. The union nut 9 engages for attachment to a collar 10 integrally formed collar collar 31st

Das Anschlusselement 10 weist im Inneren eine Druckkammer 15 zur Aufnahme der Druckluft auf. Des Weiteren ist innerhalb der Druckkammer 15 ein Verbindungselement 11 über ein Gewinde mit dem vorderen Pistolenkörper 2 verbunden. Das Verbindungselement 11 weist im Inneren einen Ventilsitz 12 auf und bildet zusammen mit der Dosiernadel 6a die wesentlichen Elemente des Dosierventils 6 für die Flüssigkeitszufuhr.The connecting element 10 has in the interior a pressure chamber 15 for receiving the compressed air. Furthermore, a connecting element 11 is connected by a thread with the front gun body 2 within the pressure chamber 15. The connecting element 11 has a valve seat 12 in the interior and together with the dispensing needle 6a, the essential elements of the metering valve 6 for the supply of liquid.

In Fließrichtung ist das Verbindungselement 11 mit einem ersten Adapter 13 verbunden, welcher zur Befestigung eines Fluidschlauches 14 dient. In den Fluidschlauch 14 wird über den geöffneten Ventilsitz 12 die Flüssigkeit eingeleitet und darin weitergeführt.In the flow direction, the connecting element 11 is connected to a first adapter 13, which serves for fastening a fluid hose 14. In the fluid tube 14, the liquid is introduced via the open valve seat 12 and continued therein.

Das Anschlusselement 10 ist in Fließrichtung der Druckluft mit einem zweiten Adapter 16 verbunden, an welchem ein Mantelschlauch 17 befestigt ist. Der Mantelschlauch 17 steht in Verbindung mit der Druckkammer 15 und wird von dieser mit Druckluft gespeist. Der am ersten Adapter 13 befestigte Fluidschlauch 14 durchläuft den zweiten Adapter 16 und wird von dem nachfolgenden Mantelschlauch 17 umgriffen. Die Druckluft im Mantelschlauch 17 wird dadurch getrennt von der Flüssigkeit im Fluidschlauch 14 geführt. Der Mantelschlauch 17 bildet aufgrund des im Inneren geführten Fluidschlauches 14 eine kreisringförmige Druckluftzufuhr aus. Gleichzeitig wird die Geschwindigkeit der Druckluft bei der Einleitung in den Mantelschlauch 17 aufgrund der Verringerung des freien Querschnitts erhöht.The connecting element 10 is connected in the flow direction of the compressed air with a second adapter 16 to which a jacket tube 17 is attached. The jacket tube 17 is in communication with the pressure chamber 15 and is fed by this with compressed air. The attached to the first adapter 13 fluid hose 14 passes through the second adapter 16 and is encompassed by the subsequent jacket tube 17. The Compressed air in the jacket tube 17 is thereby guided separately from the liquid in the fluid tube 14. The jacket tube 17 forms a circular compressed air supply due to the guided inside the fluid hose 14. At the same time, the speed of the compressed air is increased during the introduction into the jacket tube 17 due to the reduction of the free cross section.

Des Weiteren ist am Anschlusselement 10 ein Lufttrichter 19 über einen Gewindeanschluss angeordnet, in welchem der Fluidschlauch 14 und der den Fluidschlauch 14 umschließende Mantelschlauch 17 bis in den Bereich der Austrittsöffnung des Lufttrichters 19 geführt werden. Der Fluidschlauch 14 und der Mantelschlauch 17 führen im Betriebszustand der Sprühpistole 1 eine kreisförmige Rotationsbewegung innerhalb des Lufttrichters 19 aufgrund des vorliegenden Hochdruck-Luftstroms aus. Diese Rotationsbewegung erzeugt eine Art Wirbel-Strömung, die in ihrem Zentrum im Bereich einer zu reinigenden Oberfläche einen Unterdruck verursacht, wodurch Schmutzpartikel von einer zu reinigenden Oberfläche gelöst und absaugt bzw. weggeführt werden.Furthermore, a venturi 19 is arranged on the connection element 10 via a threaded connection, in which the fluid tube 14 and the jacket tube 17 enclosing the fluid tube 14 are guided into the region of the outlet opening of the venturi 19. The fluid tube 14 and the jacket tube 17 perform in the operating state of the spray gun 1 from a circular rotational movement within the air hopper 19 due to the present high-pressure air flow. This rotational movement creates a kind of vortex flow, which causes a negative pressure in its center in the region of a surface to be cleaned, whereby dirt particles are released from a surface to be cleaned and sucked or carried away.

Der Mantelschlauch 17 weist auf seiner Manteloberfläche mehrere voneinander beabstandete Hülsen 18 in unterschiedlichen Längen auf, welche die kreisförmige Bewegung im Betriebszustand der Sprühpistole 1 gleichmäßiger ausbilden bzw. aufgrund ihres Gewichtes und ihrer Elastizität dämpfen.The jacket tube 17 has on its mantle surface a plurality of spaced-apart sleeves 18 in different lengths, which form the circular motion in the operating state of the spray gun 1 evenly or attenuate due to their weight and their elasticity.

In Figur 2 ist eine perspektivische Darstellung des Anschlusselementes 10 gezeigt, welches von der Überwurfmutter 9 umgriffen ist. Der Adapter 10 wird mittels der Überwurfmutter 9 mit dem am vorderen Pistolenkörper 2a angeordneten Anschlussgewinde 30 verbunden. Zur Befestigung des Mantelschlauchs 17 ist in Fließrichtung der Druckluft am Anschlusselement 10 ein Gewindezapfen 20 mit einem Innen- und Außengewinde angeformt. In das Innengewinde des Gewindezapfens 20 ist der Adapter 16 für den Mantelschlauch 17 eingeschraubt. Auf das Außengewinde des Gewindezapfens 20 ist der Lufttrichter 19 aufgeschraubt. Das Anschlusselement 10 umgreift in seiner befestigten Anordnung am vorderen Pistolenkörper 2a das Verbindungselement 11 mit dem innen ausgebildeten Ventilsitz 12 sowie den ersten Adapter 13 zur Befestigung des Fluidschlauches 14. Der Lufttrichter 19 wird über eine Dichtung 32 gegenüber dem Anschlusselement 10 abgedichtet, um ein unerwünschtes Ansaugen von Fremdluft in den Lufttrichter 19 im Betrieb der Sprühpistole 1 zu vermeiden.In FIG. 2 is a perspective view of the connection element 10 is shown, which is encompassed by the nut 9. The adapter 10 is connected by means of the union nut 9 with the arranged on the front gun body 2a connecting thread 30. For fastening the jacket tube 17, a threaded pin 20 with an inner and outer thread is formed in the flow direction of the compressed air on the connection element 10. In the internal thread of the threaded pin 20 of the adapter 16 is screwed for the jacket tube 17. On the external thread of the threaded pin 20 of the air vent 19 is screwed. The connection element 10 engages in its fastened arrangement on the front gun body 2a, the connecting element 11 with the internally formed valve seat 12 and the first adapter 13 for securing the fluid hose 14. The venturi 19 is sealed by a seal 32 against the connecting element 10 to unwanted suction of foreign air in to avoid the venturi 19 during operation of the spray gun 1.

In Figur 3 ist das Verbindungselement 11 in einer perspektivischen Darstellung gezeigt, wobei das Verbindungselement 11 in Fließrichtung über ein Anschlussgewinde 33 mit dem ersten Adapter 13 verbunden ist. Der erste Adapter 13 dient wie erwähnt zur Befestigung des Fluidschlauches 14 am Verbindungselement 11. Auf der dem Adapter 13 gegenüberliegenden Stirnfläche des Verbindungselementes 11 ist ein Anschlussgewinde 21 zur Befestigung des Verbindungselementes 11 am vorderen Pistolenkörper 2a angeordnet. Das Verbindungselement 11 weist im Inneren den Ventilsitz 12 für das Nadel-Dosierventil auf.In FIG. 3 the connecting element 11 is shown in a perspective view, wherein the connecting element 11 is connected in the flow direction via a connecting thread 33 with the first adapter 13. As mentioned, the first adapter 13 is used for fastening the fluid hose 14 to the connecting element 11. A connecting thread 21 for fastening the connecting element 11 to the front gun body 2 a is arranged on the end face of the connecting element 11 opposite the adapter 13. The connecting element 11 has inside the valve seat 12 for the needle metering valve.

In Figur 4 wird der erste Adapter 13 zur Befestigung des Fluidschlauches 14 gezeigt, wobei das Rückseitige Ende des ersten Adapters 13 in das Anschlussgewinde 33 des Verbindungselementes 11 eingeschraubt wird. Der Fluidschlauch 14 durchläuft später den am zweiten Adapter 16 befestigten Mantelschlauch 17 bis dessen Ende, vorzugsweise bis zur Austrittsöffnung des Lufttrichters 19.In FIG. 4 the first adapter 13 for fastening the fluid hose 14 is shown, wherein the rear end of the first adapter 13 is screwed into the connecting thread 33 of the connecting element 11. The fluid hose 14 later passes through the jacket hose 17 attached to the second adapter 16 to its end, preferably up to the outlet opening of the air funnel 19.

In Figur 5 ist der zweite Adapter 16 zur Befestigung des Mantelschlauches 17 gezeigt, wobei das vorgesehene Außengewinde in das Innengewinde des Gewindezapfens 20 am Anschlusselement 10 eingeschraubt wird, Der Mantelschlauch 17 weist auf seiner Manteloberfläche mehrere voneinander beabstandete Hülsen 18 mit unterschiedlichen Längen auf, welche die beim Durchfließen der Druckluft und der Reinigungsflüssigkeit entstehende kreisförmige Bewegung dämpfen und gleichmäßig ausbilden. Die kreisförmige Bewegung erzeugt innerhalb des Lufttrichters 19 eine Wirbel-Strömung, welche in ihrem Zentrum, ähnlich einer Tornado-Strömung, im Bereich einer zu reinigenden Oberfläche einen Unterdruck erzeugt. Dadurch können Schmutzpartikel von der zu reinigenden Oberfläche gelöst und abgeführt werden.In FIG. 5 the second adapter 16 is shown for fastening the jacket tube 17, wherein the provided external thread is screwed into the internal thread of the threaded pin 20 on the connection element 10. The jacket tube 17 has on its mantle surface a plurality of spaced apart sleeves 18 of different lengths, which during flow through the Damping compressed air and the cleaning liquid resulting circular motion and form uniformly. The circular motion creates within the venturi 19 a vortex flow, which generates a negative pressure in its center, similar to a tornado flow, in the area of a surface to be cleaned. As a result, dirt particles can be released from the surface to be cleaned and removed.

In Figur 6 ist eine Detailansicht einer Sprühpistole 1 gezeigt, in welcher ein zweistufiges Dosierventil 6 integriert ist. Das Dosierventil 6 umfasst eine Dosiernadel 6a, die in Längsrichtung an ihrem vorderen Ende in der konisch ausgeformten Dichtfläche des Ventilsitzes 12 (siehe Figur 1) abdichtet. Die Ventilnadel 6a ist von einer darauf beweglichen Ventilhülse 22 umgeben, die in einem im Pistolengriff 2 angeordneten Kanal 34 geführt ist. Eine Abdichtung der Zuleitung für Druckluft 5 gegenüber dem Kanal 34 erfolgt über O-Ring-Dichtungen 26, 27, 28, die auf der Ventilhülse 22 an entsprechenden Positionen vorne, hinten und dazwischen angeordnet sind. Die Ventilhülse 22 liegt mit ihrem in Fließrichtung der Druckluft weisenden Ende auf der Rückseite des Abzugs 3 an. Durch Ziehen des Abzugs 3 in Richtung des hinteren Pistolenkörpers 2b wird die Ventilhülse 22 auf der Ventilnadel 6a verschoben, welche durch eine Rückstellfeder in Position gehalten wird. Dadurch wird ein fest mit der Ventilhülse 22 verbundener Dichtkragen 23 zusammen mit der daran angeordneten O-Ring-Dichtung 27 hinter eine in Richtung des Pistolenkörper 2b angeordnete Zuleitung für Druckluft 5 verschoben und gibt die Druckluftzufuhr in der ersten Betriebsstufe des Dosierventils 6 in einen innen liegenden Druckluftkanal frei. Die Rückstellkraft der Ventilhülse 22 erfolgt über eine Druckfeder 8, die sich zwischen einer im Kanal 34 eingeschraubten Hülse 29 und dem Dichtkragen 23 abstützt. Durch weiteres Ziehen des Abzugs 3 in Richtung des Pistolenkörpers 2b wird das hintere Ende der Hülse 22 gegen eine fest an der Ventilnadel angeordnete Druckplatte 25 gedrückt und schaltet die Flüssigkeitszufuhr der zweiten Betriebsstufe des Dosierventils 6, also die Flüssigkeitszufuhr zur Druckluft frei, indem die Ventilnadel 6a zurückgezogen wird. Bei Entlastung des Abzugs 3 wird die Ventilnadel 6a zusammen mit der Ventilhülse 22 über die Rückstellkraft der Druckfeder 8 und einer weiteren Druckfeder 35 für die Ventilnadel 6a nach vorne verschoben, wobei zuerst die Flüssigkeitszufuhr der zweiten Betriebsstufe des Dosierventils 6 und nachfolgend die Druckluftzufuhr der ersten Betriebsstufe über die Ventilhülse 22 abgeschaltet wird. Dadurch ist beispielsweise eine Reinigung einer Oberfläche mit unterschiedlichen Medien Druckluft und Druckluft-FlüssigkeitsGemisch möglich, und es wird ein Nachtropfen der Reinigungsflüssigkeit bei abgeschalteter Druckluft vermieden.In FIG. 6 a detail view of a spray gun 1 is shown, in which a two-stage metering valve 6 is integrated. The metering valve 6 comprises a metering needle 6a, which in the longitudinal direction at its front end in the conically shaped sealing surface of the valve seat 12 (see FIG. 1 ) seals. The valve needle 6a is surrounded by a valve sleeve 22 movable thereon, which is guided in a channel 34 arranged in the pistol grip 2. A sealing of the supply line for compressed air 5 with respect to the channel 34 via O-ring seals 26, 27, 28, which are arranged on the valve sleeve 22 at corresponding positions in front, behind and in between. The valve sleeve 22 rests with its pointing in the flow direction of the compressed air end on the back of the trigger 3. By pulling the trigger 3 in the direction of the rear gun body 2b, the valve sleeve 22 is displaced on the valve needle 6a, which is held in position by a return spring. As a result, a permanently connected to the valve sleeve 22 sealing collar 23 is moved together with the arranged thereon O-ring seal 27 behind a arranged in the direction of the gun body 2b supply line for compressed air 5 and gives the compressed air supply in the first operating stage of the metering valve 6 in an inner Compressed air channel free. The restoring force of the valve sleeve 22 via a compression spring 8, which is supported between a screwed-in channel 34 sleeve 29 and the sealing collar 23. By further pulling the trigger 3 in the direction of the gun body 2b, the rear end of the sleeve 22 is pressed against a fixedly arranged on the valve needle pressure plate 25 and switches the liquid supply of the second operating stage of the metering valve 6, so the liquid supply to the compressed air free by the valve needle 6a is withdrawn. Upon discharge of the trigger 3, the valve needle 6a together with the valve sleeve 22 via the restoring force of the compression spring 8 and a further compression spring 35 for Valve needle 6a moved forward, first the liquid supply of the second operating stage of the metering valve 6 and subsequently the compressed air supply of the first operating stage via the valve sleeve 22 is turned off. As a result, for example, a cleaning of a surface with different media compressed air and compressed air-liquid mixture is possible, and it is a dripping of the cleaning liquid avoided when the compressed air is switched off.

Bezugszeichenliste:LIST OF REFERENCE NUMBERS

11
Sprühpistolespray gun
22
Pistolenkörpergun body
2a2a
vorderer Pistolenkörperfront gun body
2b2 B
hinterer Pistolenkörperrear gun body
33
Abzugdeduction
44
Zuleitung - FlüssigkeitSupply line - liquid
55
Zuleitung - DruckluftSupply line - compressed air
66
Dosierventilmetering valve
6a6a
Dosiernadel / VentilnadelDispensing needle / valve needle
77
Endkappeendcap
88th
Druckfedercompression spring
99
ÜberwurfmutterNut
1010
Anschlusselement (Druckkammer)Connection element (pressure chamber)
1111
Verbindungselementconnecting element
1212
Ventilsitzvalve seat
1313
erster Adapter (Fluidschlauch)first adapter (fluid hose)
1414
Fluidschlauchfluid hose
1515
Druckkammerpressure chamber
1616
zweiter Adapter (Mantelschlauch)second adapter (jacket hose)
1717
Mantelschlauchjacket hose
1818
Hülseshell
1919
Lufttrichterventuri
2020
Gewindezapfenthreaded pin
2121
Anschlussgewindeconnecting thread
2222
Ventilhülsevalve sleeve
2323
Dichtkragensealing collar
2424
Luftkanalair duct
2525
Druckplatteprinting plate
2626
O-Ring-DichtungO-ring seal
2727
O-Ring-DichtungO-ring seal
2828
O-Ring-DichtungO-ring seal
2929
Hülseshell
3030
Anschlussgewindeconnecting thread
3131
Kragenbundcollar collar
3232
Dichtungpoetry
3333
Anschlussgewindeconnecting thread
3434
Kanalchannel
3535
Druckfedercompression spring

Claims (7)

  1. Spray gun (1) for spraying a liquid by means of compressed air, for example a cleaning liquid of a cleaning system comprising a housing having a funnel-shaped air outlet opening, means for generating a vortex flow in the air outlet opening, and means for metering the air flow volume and the liquid,
    whereby the air flow and the liquid can be mixed together by means of a two stage metering valve (6)
    characterised in that
    a connection element (10) with a pressure chamber (15) is arranged on the gun body (2),
    whereby the liquid is introduced into a fluid tube (14)
    whereby the pressure chamber (15) is connected with a jacket tube (17) surrounding the fluid tube (14) by means of a second adapter (16), and
    the jacket tube (17) is arranged in a funnel-shaped air outlet with the tube extending inside the fluid (14).
  2. Spray gun (1) according to claim 1, characterised in that an actuating means arranged on a housing (2) is adapted to actuate the two stage metering valve (6) in a first step with compressed air operation, and in a second step with compressed air/liquid operation.
  3. Spray gun (1) according to one of the preceding claims, characterised in that the flow rate of the liquid is adjustable.
  4. Spray gun (1) according to claim 3, characterised in that the liquid flows into the fluid tube (14) via a valve seat (12).
  5. Spray gun (1) according to claim 1, characterised in that the pressure chamber (15) forms an annular supply of the compressed air of equal pressure in the jacket tube (17).
  6. Spray gun (1) according to one of the preceding claims, characterised in that an air/liquid mixture is formed at the end of the jacket tube (17).
  7. Spray gun (1) according to one of the preceding claims, characterised in that the two stage metering valve (6) forms a shut-off valve for the liquid in the liquid supply line (4) to the spray gun (1).
EP11003279.4A 2010-04-20 2011-04-19 Spray gun Not-in-force EP2380667B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102010017823A DE102010017823A1 (en) 2010-04-20 2010-04-20 spray gun

Publications (2)

Publication Number Publication Date
EP2380667A1 EP2380667A1 (en) 2011-10-26
EP2380667B1 true EP2380667B1 (en) 2015-09-02

Family

ID=44280960

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11003279.4A Not-in-force EP2380667B1 (en) 2010-04-20 2011-04-19 Spray gun

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EP (1) EP2380667B1 (en)
DE (1) DE102010017823A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202012103095U1 (en) 2012-08-16 2012-08-31 Lindauer Dornier Gesellschaft Mit Beschränkter Haftung Device for surface cleaning
DE102015006330B4 (en) 2015-05-13 2019-08-22 Robert Nesen Cleaning and / or care of a surface with a liquid mixture with water and a cleaning and / or care product
CN108128283B (en) * 2017-12-28 2024-04-02 珠海格力智能装备有限公司 Spray gun and car washer with same
DE102020002468A1 (en) 2020-04-15 2021-10-21 Engelbert Homann Easily transportable, universally applicable cleaning device and reliably working, easy-to-use cleaning device for cleaning surfaces of any kind and using the same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB414478A (en) * 1933-05-04 1934-08-09 George Alfred Stevenson Improvements relating to spraying devices
CH288820A (en) * 1949-09-01 1953-02-15 Kopperschmidt Wilhelm Injection method for a medium which is to be heated for injection, and apparatus for carrying out the method.
FR1408758A (en) * 1964-06-23 1965-08-20 Sames Mach Electrostat Improvements to methods of recovering objects, and means for their implementation
US3685743A (en) * 1970-05-07 1972-08-22 Martin Sebastiani Spray guns
US5595346A (en) * 1992-04-20 1997-01-21 Spraying Systems Co. Air assisted atomizing spray nozzle
US20080251610A1 (en) * 2007-04-13 2008-10-16 Unifix Usa Llc. Spray handle with detachable front wand adaptor
DE202009011168U1 (en) 2009-08-18 2010-02-11 Heupel Reinigungstechnik Gmbh Cleaning system for cleaning surfaces

Also Published As

Publication number Publication date
EP2380667A1 (en) 2011-10-26
DE102010017823A1 (en) 2011-10-20

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