EP0638366B1 - Jet pipe for high-pressure cleaning device - Google Patents

Jet pipe for high-pressure cleaning device Download PDF

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Publication number
EP0638366B1
EP0638366B1 EP94110486A EP94110486A EP0638366B1 EP 0638366 B1 EP0638366 B1 EP 0638366B1 EP 94110486 A EP94110486 A EP 94110486A EP 94110486 A EP94110486 A EP 94110486A EP 0638366 B1 EP0638366 B1 EP 0638366B1
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EP
European Patent Office
Prior art keywords
pipe
jet pipe
supply line
jet
members
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.)
Expired - Lifetime
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EP94110486A
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German (de)
French (fr)
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EP0638366A1 (en
Inventor
Gerhard Dipl.-Ing. Dellert
Klaus Dipl.-Ing. Frech
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Alfred Kaercher SE and Co KG
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Alfred Kaercher SE and Co KG
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Publication of EP0638366A1 publication Critical patent/EP0638366A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B1/00—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means
    • B05B1/14—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening
    • B05B1/16—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening having selectively- effective outlets
    • B05B1/1627—Nozzles, spray heads or other outlets, with or without auxiliary devices such as valves, heating means with multiple outlet openings; with strainers in or outside the outlet opening having selectively- effective outlets with a selecting mechanism comprising a gate valve, a sliding valve or a cock

Definitions

  • the invention relates to a jet pipe for a high-pressure cleaning device with two concentrically arranged pipe sections, each leading to its own outlet opening, and with a switching device which connects a supply line for liquid cleaning medium either only to the inner pipe section or to both pipe sections.
  • Such a jet pipe is known, for example, from German patent DE-C-31 24 125. With such an arrangement, it is possible to selectively emit a compact point jet or a fanned-out jet via the same jet pipe, only the inner tube piece with liquid being used to generate a point jet is loaded, on the other hand, both the inner and the outer tube piece for producing the fanned-out jet.
  • a very complex construction which requires valve bodies and bulky actuating devices, is necessary, in particular a special valve block must be inserted into the jet pipe.
  • a switchover nozzle is known from EP 0 501 164 A1, in which a nozzle part can be displaced in the axial direction, so that a central nozzle opening or this central nozzle opening and surrounding nozzle bores are optionally connected to a supply line.
  • This switching nozzle is located at the end of a jet pipe and can therefore only be switched over by the operator reaching into the outlet area of the liquid. This is inconvenient and can also be dangerous if you want to switch while dispensing liquid.
  • the inner pipe section and the feed line are designed to be telescopic and that circumferential openings of the pipe sections cover in the approximate position, but are released in the extended position. As a result, the inner pipe section and the supply line lead to each other.
  • the supply line is formed at its end by a plastic sleeve into which the jet pipe can be inserted at different depths by the switching device.
  • This plastic sleeve can in particular carry axially parallel arms at its free end, which surround and guide the inner tube piece in all positions of the feed line relative to the concentric tubes.
  • the free space between the arms serves as a flow opening when the two tubes are pulled apart so far that the inner tube section reaches the area of the axially parallel arms.
  • the plastic sleeve is designed as an insert which is inserted into the end of a conduit.
  • this has the advantage that a particularly wear-resistant material can be used in this area, and on the other hand, the design of the plastic sleeve as an insert enables this insert to be adjusted and thus an adjustment of the sealing seat in relation to the displacement of the switching device.
  • the outer pipe section is preferably sealed in the feed line so that it can be moved telescopically, so that the inner and outer pipe sections can be designed to be immovable relative to one another.
  • the switching device comprises a housing which surrounds the connection point between the supply line and the two concentric pipe sections and rotates about the longitudinal axis of the jet pipe and which, in the event of rotation, displaces the supply line and the two concentric pipe sections against one another in the axial direction via cam tracks and co-operating with them .
  • a housing which surrounds the connection point between the supply line and the two concentric pipe sections and rotates about the longitudinal axis of the jet pipe and which, in the event of rotation, displaces the supply line and the two concentric pipe sections against one another in the axial direction via cam tracks and co-operating with them .
  • the housing consists of two half shells.
  • the outlet openings of the two pipe pieces can be arranged axially one behind the other.
  • This also enables a space-saving construction compared to the prior art, in which the inner pipe section and the outer pipe section are connected in a spray head via lines with different spray nozzles, because with such a construction the jet pipe maintains its continuously small outer diameter even in the outlet area.
  • the compact point jet is emitted from the inner pipe section and occurs after the Exit from a point jet nozzle connected to the inner tube piece then also through the outlet opening of the outer tube piece, which is larger in circumference than the outlet opening of the inner tube piece and therefore does not obstruct the point jet.
  • the fanned-out jet which is emitted when the outer tube section is open, is composed of a compact jet and a fanned-out jet. Part of the liquid is directed through the inner pipe section and part through the outer pipe section, the proportion of compact jets is lower than in the case of the closed outer pipe section.
  • the outer tube piece is made of plastic and the inner piece of metal.
  • the outer and inner tube piece are designed as a one-piece extruded profile, which can consist, for example, entirely of plastic or entirely of metal. The two pipe sections are then connected to one another by longitudinal webs, the annular space between the inner and the outer pipe section is thereby divided into individual sections with an arcuate cross section.
  • the jet pipe 1 of a high-pressure cleaning device shown in the drawing is connected via a switching device 2 to a tubular feed line 3, the jet pipe 1 and feed line 3 being arranged coaxially one behind the other and thus giving the impression of a continuous spray lance.
  • This is connected via a bayonet connection 4, for example, to the handle of a high-pressure cleaning device, in which there is a closing valve, which can optionally also be designed as a metering valve.
  • the hand spray gun is known per se and is therefore not shown in the drawing.
  • the jet pipe 1 carries two outlet openings through which pressurized cleaning liquid conveyed by a high-pressure cleaning device can be sprayed, for example in the form of a compact point jet and in the form of a fanned-out jet.
  • the switch device 2 can be used to select the form in which the beam is emitted.
  • the jet pipe 1 comprises an outer pipe section 5 made of plastic and an inner pipe section 6 made of metal arranged concentrically to the inside of the same. This is determined by radial webs, not shown in the drawing, in the outer tube piece. A continuous annular space 7 is thus formed between the inner pipe section 6 and the outer pipe section 5.
  • a hood 8 is placed which covers the end of the outer pipe section 5 and closes the end of the outer pipe section 5 and has a slot-shaped outlet opening 9 in its end face.
  • a nozzle body 10 is sealed onto the inner pipe section 6 and closes the end of the inner pipe section 6 and in turn has an outlet opening 11 on the end face.
  • This outlet opening 11 is designed as a step-like narrowing nozzle channel with a circular cross section and is used, for example, to form a compact point jet.
  • the outlet openings 9 and 11 are arranged coaxially one behind the other at a short distance, so that a compact jet leaving the outlet opening 11 successively passes through the outlet opening 11 and then the outlet opening 9, while liquid emerges from the annular space 7 exclusively through the outlet opening 9, the flow conditions below can also be influenced by the nozzle body 10, which extends right up to the outlet opening 9.
  • the interior 12 of the tubular feed line 3 widens step-wise at its end facing the jet pipe 1.
  • An insert in the form of a plastic sleeve 14 is screwed into a slightly enlarged area 13 of the interior 12 and is sealed off from the inner wall of the interior 12 by means of a peripheral seal 15.
  • the plastic sleeve 14 has at its end facing the jet pipe 1 a plurality of axially extending arms 16 which leave slot-shaped spaces 17 between them. These arms 16 protrude into a further enlarged area 18 of the interior 12, into which the jet pipe 1 is immersed.
  • a circumferential seal 19 on the outer wall of the outer pipe section 5 the jet pipe 1 is sealed off from the inner wall of the area 18, so that the jet pipe 1 can be moved telescopically in the longitudinal direction in the area 18 of the interior 12.
  • the jet pipe 1 and the feed line 3 are surrounded in the connection area described by a sleeve-shaped housing 22, which is formed from two half-shells formed in mirror image to one another, for example by screwing them together.
  • Each half-shell has on its inside a circumferential groove 23 into which an annular shoulder 24 of the jet pipe 1 protrudes outwards.
  • the housing is freely rotatable and axially immovable on the jet pipe.
  • both half-shells of the housing 22 each have a curved path 25 in the region of the feed line 3, which is slightly inclined relative to a plane perpendicular to the longitudinal axis of the jet pipe.
  • a driver 26 is immersed on the outer jacket of the feed line 3, so that when the housing 22 is rotated on the jet pipe 1, the feed line 3 is displaced in the axial direction relative to the jet pipe 1.
  • the spreading apart of the jet pipe 1 and the feed line 3 is limited by an inward-facing stop 27 of the housing when an outwardly directed step 28 of the feed line 3 bears against the stop 27 (FIG. 3).
  • the flow can be switched either only through the inner pipe section or through both pipe sections simultaneously, and in a simple manner by rotating the housing 22 over a small angular range, in the exemplary embodiment shown over an angular range of less than 180 °.
  • This arrangement is light in weight and is very easy for the operator to operate.

Abstract

In order to achieve a simplified construction in a blasting pipe for a high-pressure cleaning device having two pieces of pipe arranged concentrically relative to one another and leading in each case to their own outlet opening, and having a switch-over device which connects a feedline for liquid cleaning medium selectively only to the inner piece of pipe or to both pieces of pipe, it is proposed that the switch-over device displaces the blasting pipe and the feedline in an axial direction relative to one another between two positions, the feedline adjoining the inner piece of the blasting pipe in a sealing manner in the nearer position whereas, in the pulled-apart position between itself and the inner blasting pipe, it exposes an opening leading into the outer piece of the blasting pipe.

Description

Die Erfindung betrifft ein Strahlrohr für ein Hochdruckreinigungsgerät mit zwei konzentrisch zueinander angeordneten, jeweils zu einer eigenen Auslaßöffnung führenden Rohrstücken und mit einer Umschalteinrichtung, die eine Zufuhrleitung für flüssiges Reinigungsmedium wahlweise nur mit dem inneren Rohrstück oder mit beiden Rohrstücken verbindet.The invention relates to a jet pipe for a high-pressure cleaning device with two concentrically arranged pipe sections, each leading to its own outlet opening, and with a switching device which connects a supply line for liquid cleaning medium either only to the inner pipe section or to both pipe sections.

Ein solches Strahlrohr ist beispielsweise bekannt aus der deutschen Patentschrift DE-C-31 24 125. Es ist mit einer solchen Anordnung möglich, über dasselbe Strahlrohr wahlweise einen kompakten Punktstrahl abzugeben oder einen aufgefächerten Strahl, wobei zur Erzeugung eines Punktstrahles nur das innere Rohrstück mit Flüssigkeit beschickt wird, zur Herstellung des aufgefächerten Strahles dagegen sowohl das innere als auch das äußere Rohrstück. Bei der bekannten Vorrichtung ist dazu eine sehr aufwendige, Ventilkörper und sperrige Betätigungseinrichtungen benötigende Konstruktion notwendig, insbesondere muß dazu ein spezieller Ventilblock in das Strahlrohr eingesetzt werden.Such a jet pipe is known, for example, from German patent DE-C-31 24 125. With such an arrangement, it is possible to selectively emit a compact point jet or a fanned-out jet via the same jet pipe, only the inner tube piece with liquid being used to generate a point jet is loaded, on the other hand, both the inner and the outer tube piece for producing the fanned-out jet. In the known device, a very complex construction, which requires valve bodies and bulky actuating devices, is necessary, in particular a special valve block must be inserted into the jet pipe.

Aus der EP 0 501 164 A1 ist eine Umschaltdüse bekannt, bei der ein Düsenteil in axialer Richtung verschoben werden kann, so daß dadurch wahlweise eine zentrale Düsenöffnung oder diese zentrale Düsenöffnung und umgebende Düsenbohrungen mit einer Zufuhrleitung verbunden werden. Diese Umschaltdüse sitzt am Ende eines Strahlrohres und kann daher nur dadurch umgeschaltet werden, daß die Bedienungsperson in den Austrittsbereich der Flüssigkeit greift. Dies ist unbequem und unter Umständen auch gefährlich, wenn während der Flüssigkeitsabgabe umgeschaltet werden soll.A switchover nozzle is known from EP 0 501 164 A1, in which a nozzle part can be displaced in the axial direction, so that a central nozzle opening or this central nozzle opening and surrounding nozzle bores are optionally connected to a supply line. This switching nozzle is located at the end of a jet pipe and can therefore only be switched over by the operator reaching into the outlet area of the liquid. This is inconvenient and can also be dangerous if you want to switch while dispensing liquid.

Bei einer Brausekopfvorrichtung ist es an sich bekannt, im Abgabeteil durch eine axiale Verschiebung des Brausekopfes eine Umschaltung von einem Abgabebereich in einen vergrößerten Abgabebereich zu erzielen, eine solche Vorrichtung ist jedoch mit einem Strahlrohr für eine Hochdruckreinigungsvorrichtung nicht zu vergleichen, außerdem ist auch bei dieser Vorrichtung die Umschaltung im Flüssigkeitsabgabebereich vorzunehmen (EP 0 471 208 A1).In the case of a shower head device, it is known per se to switch over from a delivery area to an enlarged delivery area in the dispensing part by axially displacing the shower head, but such a device cannot be compared with a jet pipe for a high-pressure cleaning device, and this device is also not to be compared perform the switchover in the liquid delivery area (EP 0 471 208 A1).

Es ist Aufgabe der Erfindung, ein gattungsgemäßes Strahlrohr so auszubilden, daß ein konstruktiv einfacher und platzsparender Aufbau erzielt werden kann.It is an object of the invention to design a generic jet pipe so that a structurally simple and space-saving structure can be achieved.

Diese Aufgabe wird bei einem Strahlrohr der eingangs beschriebenen Art erfindungsgemäß dadurch gelöst, daß die Umschalteinrichtung das Strahlrohr und die Zufuhrleitung in axialer Richtung relativ zueinander zwischen zwei Stellungen verschiebt, wobei die Zufuhrleitung in der angenäherten Stellung dichtend an das innere Rohrstück des Strahlrohres anschließt, während sie in der auseinandergezogenen Stellung zwischen sich und dem inneren Strahlrohr eine in das äußere Rohrstück des Strahlrohres führende Öffnung freigibt. Dadurch wird es möglich, auf spezielle Ventilkörper vollständig zu verzichten, die Abdichtfunktion wird durch das innere Rohrstück einerseits und die Zufuhrleitung andererseits übernommen, diese Teile sind ohnehin vorhanden. Außerdem wird durch die axiale Verschiebung eine Verschiebung eines Ventilkörpers quer zur Längsrichtung des Strahlrohres überflüssig, so daß ein sehr raumsparender Aufbau möglich wird. Dadurch gelingt es insgesamt auch, die Umschalteinrichtung mit niedrigem Gewicht auszulegen, so daß bei der Handhabung des Strahlrohres keinerlei Behinderungen durch die Umschalteinrichtung auftreten.This object is achieved according to the invention in a jet pipe of the type described in the introduction in that the switching device shifts the jet pipe and the feed line in the axial direction relative to one another between two positions, the feed line sealingly connecting to the inner pipe section of the jet pipe in the approximate position while it is being switched on in the extended position between itself and the inner jet pipe, an opening leading into the outer pipe section of the jet pipe is released. This makes it possible to completely dispense with special valve bodies, the sealing function is performed by the inner pipe section on the one hand and the supply line on the other hand, these parts are present anyway. In addition, a displacement of a valve body transverse to the longitudinal direction of the jet pipe is superfluous due to the axial displacement, so that a very space-saving construction is possible. As a result, it is also possible overall to design the switching device with a low weight, so that there are no obstructions by the switching device when handling the jet pipe.

Bei einer bevorzugten Ausführungsform ist vorgesehen, daß das innere Rohrstück und die Zufuhrleitung teleskopierend ausgebildet sind und daß Umfangsöffnungen der Rohrstücke in der angenäherten Stellung überdeckt, in der auseinandergezogenen Stellung dagegen freigegeben sind. Dadurch führen sich das innere Rohrstück und die Zufuhrleitung gegenseitig.In a preferred embodiment it is provided that the inner pipe section and the feed line are designed to be telescopic and that circumferential openings of the pipe sections cover in the approximate position, but are released in the extended position. As a result, the inner pipe section and the supply line lead to each other.

Insbesondere kann vorgesehen sein, daß die Zufuhrleitung an ihrem Ende durch eine Kunststoffhülse gebildet wird, in die das Strahlrohr durch die Umschalteinrichtung unterschiedlich tief einschiebbar ist.In particular, it can be provided that the supply line is formed at its end by a plastic sleeve into which the jet pipe can be inserted at different depths by the switching device.

Diese Kunststoffhülse kann insbesondere an ihrem freien Ende achsparallele Arme tragen, die in allen Positionen der Zufuhrleitung relativ zu den konzentrischen Rohren das innere Rohrstück umgeben und führen. Der freie Raum zwischen den Armen dient dann als Durchflußöffnung, wenn die beiden Rohre soweit auseinandergezogen sind, daß das innere Rohrstück den Bereich der achsparallelen Arme erreicht.This plastic sleeve can in particular carry axially parallel arms at its free end, which surround and guide the inner tube piece in all positions of the feed line relative to the concentric tubes. The free space between the arms serves as a flow opening when the two tubes are pulled apart so far that the inner tube section reaches the area of the axially parallel arms.

Insbesondere ist es günstig, wenn die Kunststoffhülse als Einsatzstück ausgebildet ist, welches in das Ende eines Leitungsrohres eingesetzt ist. Dies hat einmal den Vorteil, daß in diesem Bereich ein besonders verschleißfestes Material verwendet werden kann, zum anderen ermöglicht die Ausbildung der Kunststoffhülse als Einsatz eine Verstellung dieses Einsatzes und damit eine Justierung des Dichtsitzes im Verhältnis zur Verschiebung der Umschalteinrichtung.In particular, it is advantageous if the plastic sleeve is designed as an insert which is inserted into the end of a conduit. On the one hand, this has the advantage that a particularly wear-resistant material can be used in this area, and on the other hand, the design of the plastic sleeve as an insert enables this insert to be adjusted and thus an adjustment of the sealing seat in relation to the displacement of the switching device.

Auch das äußere Rohrstück ist vorzugsweise in der Zufuhrleitung abgedichtet teleskopierend verschiebbar, so daß inneres und äußeres Rohrstück relativ zu einander unverschieblich ausgebildet sein können.The outer pipe section is preferably sealed in the feed line so that it can be moved telescopically, so that the inner and outer pipe sections can be designed to be immovable relative to one another.

Bei einer bevorzugten Ausführungsform umfaßt die Umschalteinrichtung ein die Verbindungsstelle zwischen Zufuhrleitung und den beiden konzentrischen Rohrstücken umgebendes, um die Längsachse des Strahlrohres drehbares Gehäuse, welches über Kurvenbahnen und mit diesen zusammenwirkende Mitnehmer bei der Verdrehung die Zufuhrleitung und die beiden konzentrischen Rohrstücke in axialer Richtung gegeneinander verschiebt. Eine solche Ausgestaltung erhöht den Außendurchmesser des Strahlrohres nur geringfügig und enthält mit wenigen Teilen die gesamte Umschalteinrichtung. Es ergibt sich dadurch eine raumsparende und bedienungsfreundliche Anordnung.In a preferred embodiment, the switching device comprises a housing which surrounds the connection point between the supply line and the two concentric pipe sections and rotates about the longitudinal axis of the jet pipe and which, in the event of rotation, displaces the supply line and the two concentric pipe sections against one another in the axial direction via cam tracks and co-operating with them . Such a configuration increases the outer diameter of the jet pipe only slightly and contains the entire switching device with a few parts. This results in a space-saving and user-friendly arrangement.

Günstig ist es dabei, wenn das Gehäuse aus zwei Halbschalen besteht.It is advantageous if the housing consists of two half shells.

Die Auslaßöffnungen der beiden Rohrstücke können bei einer bevorzugten Ausführungsform axial hintereinander angeordnet sein. Auch dies ermöglicht gegenüber dem Stand der Technik, bei dem das innere Rohrstück und das äußere Rohrstück in einem Sprühkopf über Leitungen mit unterschiedlichen Spritzdüsen verbunden sind, einen raumsparenden Aufbau, denn bei einer solchen Konstruktion behält das Strahlrohr auch im Auslaßbereich seinen durchgehend geringen Außendurchmesser bei. Der kompakte Punktstrahl wird aus dem inneren Rohrstück abgegeben und tritt nach dem Austritt aus einer mit dem inneren Rohrstück verbundenen Punktstrahldüse anschließend auch noch durch die Auslaßöffnung des äußeren Rohrstückes hindurch, die im Umfang größer ist als die Auslaßöffnung des inneren Rohrstückes und daher den Punktstrahl nicht behindert. Der aufgefächerte Strahl, der bei geöffnetem äußeren Rohrstück abgegeben wird, setzt sich zusammen aus einem Kompaktstrahl und einem aufgefächerten Strahl. Dabei wird ein Teil der Flüssigkeit durch das innere Rohrstück und ein Teil durch das äußere Rohrstück gelenkt, der Kompaktstrahlanteil ist geringer als im Fall des verschlossenen äußeren Rohrstückes.In a preferred embodiment, the outlet openings of the two pipe pieces can be arranged axially one behind the other. This also enables a space-saving construction compared to the prior art, in which the inner pipe section and the outer pipe section are connected in a spray head via lines with different spray nozzles, because with such a construction the jet pipe maintains its continuously small outer diameter even in the outlet area. The compact point jet is emitted from the inner pipe section and occurs after the Exit from a point jet nozzle connected to the inner tube piece then also through the outlet opening of the outer tube piece, which is larger in circumference than the outlet opening of the inner tube piece and therefore does not obstruct the point jet. The fanned-out jet, which is emitted when the outer tube section is open, is composed of a compact jet and a fanned-out jet. Part of the liquid is directed through the inner pipe section and part through the outer pipe section, the proportion of compact jets is lower than in the case of the closed outer pipe section.

Es kann vorgesehen sein, daß das äußere Rohrstück aus Kunststoff und das innere aus Metall besteht. Bei einer anderen Ausführungsform wird vorgesehen, daß äußeres und inneres Rohrstück als einteiliges Strangprofil ausgebildet sind, das beispielsweise vollständig aus Kunststoff oder vollständig aus Metall bestehen kann. Die beiden Rohrstücke sind dann durch Längsstege miteinander verbunden, der Ringraum zwischen dem inneren und dem äußeren Rohrstück wird dadurch in einzelne Abschnitte mit bogenförmigem Querschnitt unterteilt.It can be provided that the outer tube piece is made of plastic and the inner piece of metal. In another embodiment it is provided that the outer and inner tube piece are designed as a one-piece extruded profile, which can consist, for example, entirely of plastic or entirely of metal. The two pipe sections are then connected to one another by longitudinal webs, the annular space between the inner and the outer pipe section is thereby divided into individual sections with an arcuate cross section.

Die nachfolgende Beschreibung bevorzugter Ausführungsformen der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung.The following description of preferred embodiments of the invention serves in conjunction with the drawing for a more detailed explanation.

Es zeigen:

Figur 1 :
eine perspektivische Darstellung eines Strahlrohres mit Umschalteinrichtung;
Figur 2 :
eine Längsschnittansicht durch das Strahlrohr der Figur 1 im Bereich der Umschalteinrichtung und im Bereich des Strahlrohrendes bei verschlossenem äußerem Rohrstück;
Figur 3 :
eine Ansicht ähnlich Figur 2 bei geöffnetem äußerem Rohrstück und
Figur 4 :
eine Schnittansicht längs Linie 4-4 in Figur 2.
Show it:
Figure 1:
a perspective view of a jet pipe with switching device;
Figure 2:
2 shows a longitudinal sectional view through the jet pipe of FIG. 1 in the area of the switchover device and in the area of the jet pipe end with the outer pipe piece closed;
Figure 3:
a view similar to Figure 2 with the outer tube section open and
Figure 4:
a sectional view taken along line 4-4 in Figure 2.

Das in der Zeichnung dargestellte Strahlrohr 1 eines Hochdruckreinigungsgerätes ist über eine Umschalteinrichtung 2 mit einer rohrförmigen Zufuhrleitung 3 verbunden, wobei Strahlrohr 1 und Zufuhrleitung 3 koaxial zueinander hintereinander angeordnet sind und somit den Eindruck einer durchgehenden Sprühlanze erwecken. Diese ist über eine Bajonettverbindung 4 beispielsweise mit dem Handgriff einer Hochdruckreinigungseinrichtung verbunden, in der sich ein Schließventil befindet, das gegebenenfalls auch als Dosierventil ausgebildet sein kann. Die Handspritzpistole ist an sich bekannt und daher in der Zeichnung nicht dargestellt.The jet pipe 1 of a high-pressure cleaning device shown in the drawing is connected via a switching device 2 to a tubular feed line 3, the jet pipe 1 and feed line 3 being arranged coaxially one behind the other and thus giving the impression of a continuous spray lance. This is connected via a bayonet connection 4, for example, to the handle of a high-pressure cleaning device, in which there is a closing valve, which can optionally also be designed as a metering valve. The hand spray gun is known per se and is therefore not shown in the drawing.

Am freien Ende trägt das Strahlrohr 1 zwei Auslaßöffnungen, durch die von einem Hochdruckreinigungsgerät geförderte, unter Druck stehende Reinigungsflüssigkeit versprüht werden kann, beispielsweise in Form eines kompakten Punktstrahles und in Form eines aufgefächerten Strahles. Dabei läßt sich durch die Umschalteinrichtung 2 wählen, in welcher Form der Strahl abgegeben wird.At the free end, the jet pipe 1 carries two outlet openings through which pressurized cleaning liquid conveyed by a high-pressure cleaning device can be sprayed, for example in the form of a compact point jet and in the form of a fanned-out jet. The switch device 2 can be used to select the form in which the beam is emitted.

Das Strahlrohr 1 umfaßt ein äußeres Rohrstück 5 aus Kunststoff und ein konzentrisch zu diesem im Inneren desselben angeordnetes inneres Rohrstück 6 aus Metall. Dieses ist durch in der Zeichnung nicht dargestellte radiale Stege im äußeren Rohrstück festgelegt. Zwischen dem inneren Rohrstück 6 und dem äußeren Rohrstück 5 wird somit ein durchgehender Ringraum 7 ausgebildet.The jet pipe 1 comprises an outer pipe section 5 made of plastic and an inner pipe section 6 made of metal arranged concentrically to the inside of the same. This is determined by radial webs, not shown in the drawing, in the outer tube piece. A continuous annular space 7 is thus formed between the inner pipe section 6 and the outer pipe section 5.

Auf das äußere Rohrstück 5 ist abgedichtet eine das Ende des äußeren Rohrstückes 5 überfangende Haube 8 aufgesetzt, die das äußere Rohrstück 5 stirnseitig verschließt und die in ihrer Stirnseite eine schlitzförmige Auslaßöffnung 9 aufweist.On the outer pipe section 5, a hood 8 is placed which covers the end of the outer pipe section 5 and closes the end of the outer pipe section 5 and has a slot-shaped outlet opening 9 in its end face.

In ähnlicher Weise ist auf das innere Rohrstück 6 abgedichtet ein Düsenkörper 10 aufgesetzt, der das innere Rohrstück 6 endseitig abschließt und seinerseits eine stirnseitige Auslaßöffnung 11 aufweist. Diese Auslaßöffnung 11 ist als sich stufenförmig verengender Düsenkanal mit kreisförmigem Querschnitt ausgebildet und dient beispielsweise der Ausformung eines kompakten Punktstrahles.In a similar manner, a nozzle body 10 is sealed onto the inner pipe section 6 and closes the end of the inner pipe section 6 and in turn has an outlet opening 11 on the end face. This outlet opening 11 is designed as a step-like narrowing nozzle channel with a circular cross section and is used, for example, to form a compact point jet.

Die Auslaßöffnungen 9 und 11 sind in kurzem Abstand koaxial zueinander hintereinander angeordnet, so daß ein die Auslaßöffnung 11 verlassender Kompaktstrahl nacheinander die Auslaßöffnung 11 und dann die Auslaßöffnung 9 passiert, während Flüssigkeit aus dem Ringraum 7 ausschließlich durch die Auslaßöffnung 9 austritt, wobei die Strömungsverhältnisse unter anderem auch durch den Düsenkörper 10 beeinflußt werden, der bis unmittelbar an die Auslaßöffnung 9 heranreicht.The outlet openings 9 and 11 are arranged coaxially one behind the other at a short distance, so that a compact jet leaving the outlet opening 11 successively passes through the outlet opening 11 and then the outlet opening 9, while liquid emerges from the annular space 7 exclusively through the outlet opening 9, the flow conditions below can also be influenced by the nozzle body 10, which extends right up to the outlet opening 9.

Der Innenraum 12 der rohrförmigen Zufuhrleitung 3 erweitert sich an ihrem dem Strahlrohr 1 zugewandten Ende stufenförmig.The interior 12 of the tubular feed line 3 widens step-wise at its end facing the jet pipe 1.

In einem geringfügig erweiterten Bereich 13 des Innenraumes 12 ist ein Einsatz in Form einer Kunststoffhülse 14 eingeschraubt und mittels einer Umfangsdichtung 15 gegenüber der Innenwand des Innenraumes 12 abgedichtet. Die Kunststoffhülse 14 weist an ihrem dem Strahlrohr 1 zugewandten Ende mehrere axial verlaufende Arme 16 auf, die zwischen sich schlitzförmige Zwischenräume 17 freilassen. Diese Arme 16 ragen in einen nochmals erweiterten Bereich 18 des Innenraumes 12 hinein, in den das Strahlrohr 1 eintaucht. Durch eine Umfangsdichtung 19 auf der Außenwand des äußeren Rohrstückes 5 ist das Strahlrohr 1 gegenüber der Innenwand des Bereiches 18 abgedichtet, so daß das Strahlrohr 1 im Bereich 18 des Innenraumes 12 in Längsrichtung teleskopierend abgedichtet verschoben werden kann.An insert in the form of a plastic sleeve 14 is screwed into a slightly enlarged area 13 of the interior 12 and is sealed off from the inner wall of the interior 12 by means of a peripheral seal 15. The plastic sleeve 14 has at its end facing the jet pipe 1 a plurality of axially extending arms 16 which leave slot-shaped spaces 17 between them. These arms 16 protrude into a further enlarged area 18 of the interior 12, into which the jet pipe 1 is immersed. By means of a circumferential seal 19 on the outer wall of the outer pipe section 5, the jet pipe 1 is sealed off from the inner wall of the area 18, so that the jet pipe 1 can be moved telescopically in the longitudinal direction in the area 18 of the interior 12.

In einer ersten Stellung, in der Strahlrohr 1 und Zufuhrleitung 3 einander angenähert sind, taucht das freie Ende des inneren Rohrstückes 6 in die Kunststoffhülse 14 so tief ein, daß das freie Ende 20 des inneren Rohrstückes 6 die Zwischenräume 17 zwischen den Armen 16 der Kunststoffhülse 14 vollständig überdeckt. Dabei liegt das freie Ende 20 des inneren Rohrstückes 6 an einer geringfügig nach innen vorstehenden Stufe 21 der Kunststoffhülse 14 an, so daß eine im wesentlichen dichte Verbindung des Innenraums der Kunststoffhülse 14 mit dem Innenraum des inneren Rohrstückes 6 hergestellt wird. Diese angenäherte Stellung ist in Figur 2 dargestellt.In a first position, in the jet pipe 1 and supply line 3 are approached to each other, the free end of the inner tube piece 6 is immersed in the plastic sleeve 14 so deep that the free end 20 of the inner tube piece 6, the spaces 17 between the arms 16 of the plastic sleeve 14 completely covered. Here, the free end 20 of the inner tube piece 6 abuts a slightly inwardly projecting step 21 of the plastic sleeve 14, so that a substantially sealed connection between the interior of the plastic sleeve 14 and the interior of the inner tube piece 6 is produced. This approximate position is shown in Figure 2.

Bei einer entfernteren Stellung, bei der die Zufuhrleitung 3 und das Strahlrohr 1 in axialer Richtung auseinandergezogen sind, ist das freie Ende 20 des inneren Rohrstückes 6 von der Stufe 21 abgehoben und so weit von dieser entfernt, daß die Zwischenräume 17 zwischen den Armen 16 der Kunststoffhülse 14 zumindest teilweise freigegeben sind. Dadurch wird eine Strömungsverbindung zwischen dem Innenraum der Kunststoffhülse 14 einerseits und dem Bereich 18 des Innenraumes 12 andererseits hergestellt; dieser Innenraum 12 steht wiederum mit dem Ringraum 7 in Strömungsverbindung. Damit kann Flüssigkeit nunmehr in dieser Stellung aus dem Inneren der Kunststoffhülse 14, also aus der Zufuhrleitung 3, sowohl in das innere Rohrstück 6 als auch in den Ringraum 7 des äußeren Rohrstückes 5 eintreten. Diese entfernte Stellung ist in Figur 3 dargestellt, wobei dort zur Verdeutlichung das Strahlrohr 1 so weit von der Zufuhrleitung 3 entfernt ist, daß das innere Rohrstück 6 vollständig aus der Kunststoffhülse 14 und ihren Armen 16 ausgetreten ist. Dies ist nicht unbedingt notwendig, es kann in manchen Fällen eine geringere Trennung ausreichen, andererseits ist es auch möglich, die Arme 16 so zu verlängern, daß sie in der am meisten entfernten Stellung noch an der Außenseite des inneren Rohrstückes 6 anliegen und dieses dadurch koaxial zum äußeren Rohrstück 5 führen.In a more distant position, in which the feed line 3 and the jet pipe 1 are pulled apart in the axial direction, the free end 20 of the inner tube piece 6 is lifted from the step 21 and so far away from it that the spaces 17 between the arms 16 of the Plastic sleeve 14 are at least partially released. This creates a flow connection between the interior of the plastic sleeve 14 on the one hand and the area 18 of the interior 12 on the other hand; this interior 12 is in turn in flow connection with the annular space 7. In this position, liquid can now enter the interior of the plastic sleeve 14, that is to say from the supply line 3, both into the inner tube piece 6 and into the annular space 7 of the outer tube piece 5. This removed position is shown in FIG. 3, with the jet pipe 1 being so far away from the feed line 3 that the inner pipe section 6 has completely emerged from the plastic sleeve 14 and its arms 16. This is not absolutely necessary, in some cases a smaller separation may be sufficient; on the other hand, it is also possible to extend the arms 16 in such a way that, in the most distant position, they still rest on the outside of the inner tube piece 6 and thereby this coaxially lead to the outer pipe section 5.

Das Strahlrohr 1 und die Zufuhrleitung 3 sind in dem beschriebenen Verbindungsbereich von einem hülsenförmigen Gehäuse 22 umgeben, welches aus zwei spiegelbildlich zueinander ausgebildeten Halbschalen gebildet wird, beispielsweise durch Verschrauben derselben.The jet pipe 1 and the feed line 3 are surrounded in the connection area described by a sleeve-shaped housing 22, which is formed from two half-shells formed in mirror image to one another, for example by screwing them together.

Jede Halbschale weist an ihrer Innenseite eine Umfangsnut 23 auf, in die eine nach außen abstehende Ringschulter 24 des Strahlrohres 1 eintaucht. Dadurch wird das Gehäuse auf dem Strahlrohr frei drehbar und axial unverschieblich gehalten.Each half-shell has on its inside a circumferential groove 23 into which an annular shoulder 24 of the jet pipe 1 protrudes outwards. As a result, the housing is freely rotatable and axially immovable on the jet pipe.

Weiterhin weisen beide Halbschalen des Gehäuses 22 im Bereich der Zufuhrleitung 3 je eine Kurvenbahn 25 auf, die relativ zu einer auf der Längsachse des Strahlrohres senkrecht stehenden Ebene geringfügig geneigt ist. In diese Kurvenbahn 25 taucht ein Mitnehmer 26 auf dem Außenmantel der Zufuhrleitung 3 ein, so daß bei einer Verdrehung des Gehäuses 22 auf dem Strahlrohr 1 die Zufuhrleitung 3 in axialer Richtung relativ zum Strahlrohr 1 verschoben wird. Das Auseinanderschieben des Strahlrohres 1 und der Zufuhrleitung 3 wird durch einen nach innen weisenden Anschlag 27 des Gehäuses begrenzt, wenn eine nach außen gerichtete Stufe 28 der Zufuhrleitung 3 am Anschlag 27 anliegt (Figur 3).Furthermore, both half-shells of the housing 22 each have a curved path 25 in the region of the feed line 3, which is slightly inclined relative to a plane perpendicular to the longitudinal axis of the jet pipe. In this cam track 25, a driver 26 is immersed on the outer jacket of the feed line 3, so that when the housing 22 is rotated on the jet pipe 1, the feed line 3 is displaced in the axial direction relative to the jet pipe 1. The spreading apart of the jet pipe 1 and the feed line 3 is limited by an inward-facing stop 27 of the housing when an outwardly directed step 28 of the feed line 3 bears against the stop 27 (FIG. 3).

Mit einer Umschalteinrichtung der beschriebenen Art kann mit wenigen Bauteilen und mit geringem Platzbedarf eine Umschaltung der Strömung wahlweise nur durch das innere Rohrstück oder durch beide Rohrstücke gleichzeitig vorgenommen werden, und zwar in einfacher Weise durch Drehen des Gehäuses 22 über einen geringen Winkelbereich, im dargestellten Ausführungsbeispiel über einen Winkelbereich von weniger als 180°. Diese Anordnung hat ein geringes Gewicht und ist für die Bedienungsperson sehr leicht zu betätigen.With a switching device of the type described, with a few components and with a small space requirement, the flow can be switched either only through the inner pipe section or through both pipe sections simultaneously, and in a simple manner by rotating the housing 22 over a small angular range, in the exemplary embodiment shown over an angular range of less than 180 °. This arrangement is light in weight and is very easy for the operator to operate.

Claims (11)

  1. A jet pipe for a high-pressure cleaning device, with two pipe members (5, 6) arranged concentrically with each other and each leading to a separate outlet opening (9, 11), and with a change-over device which connects a supply line (3) for liquid cleaning medium optionally only to the inner pipe member (6) or to both pipe members (5, 6), characterized in that the change-over device (2) displaces the jet pipe (1) and the supply line (3) in the axial direction relative to each other between two positions, wherein the supply line (3) in the closed position abuts the inner pipe member (6) of the jet pipe (1) in a sealed manner, whereas in the spaced position between itself and the inner pipe member (6) [the jet pipe (1)] frees an opening (17) leading into the outer pipe member (5) of the jet pipe (1).
  2. A jet pipe according to Claim 1, characterized in that the inner pipe member (6) and the supply line (3) are constructed in a telescopic manner, and peripheral openings (17) in the pipe members are covered in the closed position, but are freed in the spaced position.
  3. A jet pipe according to Claim 2, characterized in that the end of the supply line (3) is formed by a plastics sleeve (14) into which the jet pipe can be inserted to different depths by the change-over device (2).
  4. A jet pipe according to Claim 3, characterized in that the free end of the plastics sleeve (14) supports axially parallel arms (16) which surround and guide the inner pipe member (6) in all positions of the supply line (3) relative to the concentric pipe members.
  5. A jet pipe according to Claim 3 or 4, characterized in that the plastics sleeve (14) is constructed as an insert member which is inserted into the end of a pipe of the supply line (3).
  6. A jet pipe according to one of the preceding Claims, characterized in that the outer pipe member (5) is displaceable telescopically in the supply line (3) in a sealed manner.
  7. A jet pipe according to one of the preceding Claims, characterized in that the changeover device (2) comprises a housing (22) which surrounds the connexion point between the supply line (3) and the two concentric pipe members (5, 6) and is rotatable about the longitudinal axis of the jet pipe (1) and which displaces the supply line (3) and the two concentric pipe members (5, 6) in the axial direction relative to one another by way of curved paths (25) and entrainment members (26) cooperating therewith.
  8. A jet pipe according to Claim 7, characterized in that the housing (22) comprises two half shells.
  9. A jet pipe according to one of the preceding Claims, characterized in that the outlet openings (9, 11) of the two pipe members (5, 6) are arranged axially one behind the other.
  10. A jet pipe according to one of the preceding Claims, characterized in that the outer pipe member (5) consists of plastics material and the inner pipe member (6) of metal.
  11. A jet pipe according to one of Claims 1 to 9, characterized in that the outer pipe member (5) and the inner pipe member (6) are constructed as an integral extruded section.
EP94110486A 1993-08-12 1994-07-06 Jet pipe for high-pressure cleaning device Expired - Lifetime EP0638366B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4327155A DE4327155C1 (en) 1993-08-12 1993-08-12 Blasting pipe for a high-pressure cleaning device
DE4327155 1993-08-12

Publications (2)

Publication Number Publication Date
EP0638366A1 EP0638366A1 (en) 1995-02-15
EP0638366B1 true EP0638366B1 (en) 1997-04-09

Family

ID=6495064

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94110486A Expired - Lifetime EP0638366B1 (en) 1993-08-12 1994-07-06 Jet pipe for high-pressure cleaning device

Country Status (4)

Country Link
EP (1) EP0638366B1 (en)
AT (1) ATE151312T1 (en)
DE (2) DE4327155C1 (en)
DK (1) DK0638366T3 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10946401B2 (en) 2016-07-20 2021-03-16 Aptar Radolfzell Gmbh Liquid dispenser with a discharge head

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK171930B1 (en) * 1996-02-13 1997-08-18 Scanio Flow Equip Cleaning Systems
EP1254719A1 (en) * 2001-05-03 2002-11-06 Nilfisk-Advance A/S A liquid-ejection device for a high-pressure cleaning apparatus
DE10257783B3 (en) 2002-12-11 2004-03-18 Alfred Kärcher Gmbh & Co. Kg Nozzle arrangement for a high pressure cleaning device comprises a nozzle hose supporting a pot-shaped housing, and displacement devices moving a low and a high pressure nozzle in the housing against and away from a seal connector
PL1663504T3 (en) 2004-09-13 2008-01-31 Washtec Holding Gmbh Cleaning lance
US8640973B2 (en) * 2006-09-07 2014-02-04 Briggs And Stratton Corporation Pressure washer wand having a nozzle selector
EP3200928B1 (en) * 2014-10-02 2018-12-05 Alfred Kärcher SE & Co. KG Nozzle arrangement for liquid
DE102019120367A1 (en) * 2019-07-29 2021-02-04 Alfred Kärcher SE & Co. KG Switchable nozzle arrangement

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Publication number Priority date Publication date Assignee Title
DE3124125C3 (en) * 1981-06-19 1994-08-04 Wap Reinigungssysteme High pressure spray gun with two separate spray nozzles
US4785998A (en) * 1986-06-09 1988-11-22 Toshio Takagi Water spraying nozzle
DE9011751U1 (en) * 1990-08-13 1990-10-18 Baber, Reinhard, 6934 Neckargerach, De
IT1245146B (en) * 1991-02-11 1994-09-13 Faip Off Mecc PERFECTED NOZZLE FOR HIGH PRESSURE CLEANING MACHINES AND SIMILAR WITH ALIGNED DISPENSING SPOUTS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10946401B2 (en) 2016-07-20 2021-03-16 Aptar Radolfzell Gmbh Liquid dispenser with a discharge head

Also Published As

Publication number Publication date
EP0638366A1 (en) 1995-02-15
DE4327155C1 (en) 1994-10-06
DE59402354D1 (en) 1997-05-15
DK0638366T3 (en) 1997-08-04
ATE151312T1 (en) 1997-04-15

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