EP1532366B1 - Pump for a high-pressure cleaning device - Google Patents

Pump for a high-pressure cleaning device Download PDF

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Publication number
EP1532366B1
EP1532366B1 EP03794866A EP03794866A EP1532366B1 EP 1532366 B1 EP1532366 B1 EP 1532366B1 EP 03794866 A EP03794866 A EP 03794866A EP 03794866 A EP03794866 A EP 03794866A EP 1532366 B1 EP1532366 B1 EP 1532366B1
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EP
European Patent Office
Prior art keywords
piston
pump according
pump
peripheral groove
seal
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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EP03794866A
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German (de)
French (fr)
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EP1532366A1 (en
Inventor
Wolfgang Müller
Thomas Deuschinger
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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 EP1532366A1 publication Critical patent/EP1532366A1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/14—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis having stationary cylinders
    • F04B1/141—Details or component parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
    • F04B1/122—Details or component parts, e.g. valves, sealings or lubrication means
    • F04B1/124—Pistons
    • F04B1/126—Piston shoe retaining means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/164—Stoffing boxes

Definitions

  • the invention relates to a pump for a high-pressure cleaner with at least a reciprocally driven piston, on the one hand in a Pumping space of a pump housing and on the other hand in a drive chamber the pump housing dips, with a voltage applied to the circumference of the piston High-pressure seal in the inlet region of the piston in the pump chamber, with a voltage applied to the circumference of the piston oil seal in the inlet region of the Piston in the drive chamber and with a piston between the high pressure seal and oil seal surrounding plenum for out of the pump room liquid leaking past the high pressure seal.
  • Such a pump is described for example in DE 31 28 737. at Such a construction, it is possible that despite providing a collecting space Liquid adhering to the surface of the piston, up to the area taken along the oil seal and is passed to this, so that This liquid can get into the drive chamber and there with the Oil filling of the drive chamber mixed. This leads to damage of the Pump, as these leakage fluid increase the pressure in the drive chamber leaves.
  • This object is according to the invention in a pump of the type described above achieved in that the piston in the area between the high pressure seal and the oil seal has at least one circumferential groove, and that the high pressure seal and the oil seal as far away from each other are that the circumferential groove or the circumferential grooves in the lifting movement of Piston reach neither the high pressure seal nor the oil seal.
  • the circumferential groove can have very different cross sections, in particular it is advantageous if the circumferential groove has a rectangular cross-section so that there is a sharp edge, which the film of the abducted Liquid interrupts.
  • the Circumferential groove in the central region of its bottom a circumferential, recessed gutter This may preferably have a rectangular cross-section exhibit. This makes it possible, on the one hand, in the transition between the peripheral surface of the piston and circumferential groove to avoid a sharp edge and thereby a violation of the oil seal during assembly, on the other hand but can There is a sharp edge between the bottom of the circumferential groove and the gutter which reliably interrupts the film of the entrained liquid.
  • the circumferential groove has an arcuate cross-section, it can be provided be that the contour of the circumferential groove relative to the contour of the peripheral surface of the piston extends obliquely in the edge region of the circumferential groove.
  • the width of the circumferential groove is preferably between 0.5 mm and 5 mm.
  • the Depth of the circumferential groove is preferably between 0.5 mm and 3 mm.
  • a spacer surrounding the piston is arranged, which is the high pressure seal and / or the oil seal supported in the axial direction.
  • the collection space may have a drain, so that the collected in him Liquid is supplied, for example, the suction side of the pump again.
  • the pump 1 shown in the drawing is part of a high-pressure cleaning device, which is not shown in the drawing, the pump 1 is driven by an electric motor also not shown or a another drive motor, such as a fossil fuel engine.
  • the pump 1 comprises a pump housing 2 with a drive chamber 3 and with a plurality of pumping chambers 4, each having a suction valve 5 with a Suction line 6 and connected via a pressure valve 7 with a pressure line 8 are.
  • a cylindrical piston 9 the other End immersed through an opening 10 in the drive chamber 3, in this Drive chamber 3 is a driven by the drive motor Swash plate 11, against which the piston 9 is pressed by means of a compression spring 12 becomes.
  • the pump 1 comprises two such pistons, the structure is in both Piston selected similar, therefore, the construction is only on one Piston discussed.
  • a high-pressure seal 14 is arranged, the the peripheral wall of the cylindrical piston 9 sealingly abuts and the pumping chamber 4 thereby seals in the inlet region of the piston 9.
  • an oil seal 15 is also provided on the peripheral wall of the piston 9 sealingly abuts and thereby the drive chamber 3, the at least partially filled with oil, seals.
  • a spacer element 18 is surrounding the piston 9, which can be seen on both the high-pressure seal14 and the oil seal 15 and thereby supported in the axial direction, i. in the direction of displacement of the piston 9, determines.
  • a circumferential groove 19 incorporated in the stroke movement of the piston 9 with rotating swash plate 11 between the oil seal 15th on the one hand and high-pressure seal 14 on the other hand is moved that they both seals not reached, the reversal point is so in front of each one the two seals.
  • the circumferential groove 19 is on the left side in FIG shown near the oil seal, on the right side near the High pressure seal, the displacement of the circumferential groove 19 corresponds to the stroke of the piston 9.
  • the circumferential groove has 19th a rectangular cross-section, in the region between the side wall 20 of the circumferential groove 19 and the peripheral wall 21 of the piston 9 is a chamfer 22nd intended.
  • the width of the circumferential groove in the axial direction for example between 0.5 mm and 5 mm, their depth is between 0.5 mm and 3 mm.
  • the cross section of the circumferential groove 19 is in the embodiments of the figures 2 and 3 equal, in the embodiment of Figure 4 is missing the bevel 22, so that in the transition region between the side wall 20 and peripheral wall 21 forms a sharp edge 23.
  • Figure 5 differs from that of Figure 3 in that in the bottom 24 of the circumferential groove 19 in addition a recessed, circumferential Channel 25 is provided, which in the illustrated embodiment has a rectangular cross section and thus with a sharp Edge 26 opens into the bottom 24 of the circumferential groove 19.
  • the width of the channel may for example be between 0.5 mm and 5 mm, their depth is between 0.5 mm and 3 mm.
  • the circumferential groove 19 has an arcuate Contour 27, which opens obliquely into the peripheral wall 21.

Abstract

The pump has at least one reciprocating piston (9) partly contained in a pump chamber (4) of a pump housing (2) and partly contained in a drive chamber (3) of the pump housing, the piston cooperating with a high-pressure seal (14) and an oil seal (15), with a collection space for leakage fluid between them. The piston has a peripheral channel (19) between the seals, the latter spaced so that the peripheral channel does not reach either seal during the piston reciprocation.

Description

Die Erfindung betrifft eine Pumpe für ein Hochdruckreinigungsgerät mit mindestens einem reziprozierend angetriebenen Kolben, der einerseits in einen Pumpraum eines Pumpengehäuses und andererseits in eine Antriebskammer des Pumpengehäuses eintaucht, mit einer am Umfang des Kolbens anliegenden Hochdruckdichtung im Eintrittsbereich des Kolbens in den Pumpraum, mit einer am Umfang des Kolbens anliegenden Öldichtung im Eintrittsbereich des Kolbens in die Antriebskammer und mit einem den Kolben zwischen Hochdruckdichtung und Öldichtung umgebenden Sammelraum für aus dem Pumpraum an der Hochdruckdichtung vorbei austretende Flüssigkeit.The invention relates to a pump for a high-pressure cleaner with at least a reciprocally driven piston, on the one hand in a Pumping space of a pump housing and on the other hand in a drive chamber the pump housing dips, with a voltage applied to the circumference of the piston High-pressure seal in the inlet region of the piston in the pump chamber, with a voltage applied to the circumference of the piston oil seal in the inlet region of the Piston in the drive chamber and with a piston between the high pressure seal and oil seal surrounding plenum for out of the pump room liquid leaking past the high pressure seal.

Eine solche Pumpe ist beispielsweise in der DE 31 28 737 beschrieben. Bei einer solchen Konstruktion ist es möglich, daß trotz Vorsehen eines Sammelraumes Flüssigkeit, die an der Oberfläche des Kolbens haftet, bis in den Bereich der Öldichtung mitgenommen und an dieser vorbeigeführt wird, so daß diese Flüssigkeit in die Antriebskammer gelangen kann und sich dort mit der Ölfüllung der Antriebskammer vermischt. Dies führt zu Beschädigungen der Pumpe, da diese Leckageflüssigkeit den Druck in der Antriebskammer ansteigen läßt.Such a pump is described for example in DE 31 28 737. at Such a construction, it is possible that despite providing a collecting space Liquid adhering to the surface of the piston, up to the area taken along the oil seal and is passed to this, so that This liquid can get into the drive chamber and there with the Oil filling of the drive chamber mixed. This leads to damage of the Pump, as these leakage fluid increase the pressure in the drive chamber leaves.

Um dies zu vermeiden, ist es bereits bekannt, im Sammelraum eine zusätzliche Abstreifdichtung vorzusehen, es wird also zwischen Hochdruckdichtung einerseits und Öldichtung andererseits noch eine weitere Dichtung notwendig, die den Kolben umgibt und verschleppte Leckageflüssigkeit abstreifen soll. To avoid this, it is already known in the collection room an additional To provide a wiper seal, so it is between the high pressure seal on the one hand and oil seal on the other hand still another seal necessary which surrounds the piston and stripped off leaked liquid leakage.

Durch diese zusätzliche Dichtung wird die Konstruktion erheblich komplizierter und auch anfälliger.This additional seal makes the construction considerably more complicated and also more vulnerable.

Es ist Aufgabe der Erfindung, eine gattungsgemäße Pumpe so auszugestalten, daß ohne Verwendung einer zusätzlichen Abstreiferdichtung eine Verschleppung von Leckageflüssigkeit aus dem Sammelraum in die Antriebskammer verhindert wird.It is an object of the invention to design a generic pump in such a way that without the use of an additional wiper seal carryover of leakage fluid from the plenum into the drive chamber is prevented.

Diese Aufgabe wird bei einer Pumpe der eingangs beschriebenen Art erfindungsgemäß dadurch gelöst, daß der Kolben im Bereich zwischen der Hochdruckdichtung und der Öldichtung mindestens eine Umfangsnut aufweist und daß die Hochdruckdichtung und die Öldichtung soweit voneinander entfernt sind, daß die Umfangsnut oder die Umfangsnuten bei der Hubbewegung des Kolbens weder die Hochdruckdichtung noch die Öldichtung erreichen.This object is according to the invention in a pump of the type described above achieved in that the piston in the area between the high pressure seal and the oil seal has at least one circumferential groove, and that the high pressure seal and the oil seal as far away from each other are that the circumferential groove or the circumferential grooves in the lifting movement of Piston reach neither the high pressure seal nor the oil seal.

Es hat sich überraschenderweise herausgestellt, daß eine solche Umfangsnut den Film der verschleppten Flüssigkeit auf der Umfangsfläche des Kolbens unterbricht und die verschleppte Flüssigkeit in sich sammelt, so daß diese seitlich aus der Umfangsnut in den Sammelraum abfließen kann. Dadurch setzt sich der Film der verschleppten Flüssigkeit auf der der Öldichtung zugewandten Seite der Umfangsnut nicht mehr fort, die verschleppte Flüssigkeit wird also durch die Umfangsnut zuverlässig in den Sammelraum umgeleitet und von der Öldichtung ferngehalten.It has surprisingly been found that such a circumferential groove the film of the dragged liquid on the peripheral surface of the piston interrupts and collects the entrained liquid in itself, so that these laterally can flow from the circumferential groove into the plenum. This sets the film of the dragged liquid on the oil seal facing Side of the circumferential groove is no longer gone, the liquid is dragged off so reliably redirected by the circumferential groove in the plenum and kept away from the oil seal.

Die Umfangsnut kann sehr unterschiedliche Querschnitte aufweisen, insbesondere ist es vorteilhaft, wenn die Umfangsnut einen rechteckigen Querschnitt aufweist, so daß sich eine scharfe Kante ergibt, die den Film der verschleppten Flüssigkeit unterbricht. The circumferential groove can have very different cross sections, in particular it is advantageous if the circumferential groove has a rectangular cross-section so that there is a sharp edge, which the film of the abducted Liquid interrupts.

Bei einer abgewandelten Ausführungsform ist vorgesehen, daß die Kante zwischen Umfangsfläche des Kolbens und Seitenwand der Umfangsnut abgeschrägt ist, dadurch wird eine Beschädigung der Öldichtung bei der Montage der Pumpe vermieden, bei dieser Montage muß der Kolben durch die Öldichtung hindurchgeschoben werden.In a modified embodiment it is provided that the edge bevelled between the peripheral surface of the piston and side wall of the circumferential groove This will damage the oil seal during assembly avoided the pump, in this assembly, the piston through the oil seal be pushed through.

Es kann auch vorgesehen sein, daß die Seitenwand der Umfangsnut abgeschrägt ist.It can also be provided that the side wall of the circumferential groove bevelled is.

Bei einer besonders bevorzugten Ausführungsform ist vorgesehen, daß die Umfangsnut im mittleren Bereich ihres Bodens eine umlaufende, vertiefte Rinne aufweist, diese kann vorzugsweise einen rechteckförmigen Querschnitt aufweisen. Dadurch ist es einerseits möglich, im Übergang zwischen Umfangsfläche des Kolbens und Umfangsnut eine scharfe Kante zu vermeiden und dadurch eine Verletzung der Öldichtung bei der Montage, andererseits kann aber zwischen dem Boden der Umfangsnut und der Rinne eine scharfe Kante vorhanden sein, die zuverlässig den Film der verschleppten Flüssigkeit unterbricht.In a particularly preferred embodiment it is provided that the Circumferential groove in the central region of its bottom a circumferential, recessed gutter This may preferably have a rectangular cross-section exhibit. This makes it possible, on the one hand, in the transition between the peripheral surface of the piston and circumferential groove to avoid a sharp edge and thereby a violation of the oil seal during assembly, on the other hand but can There is a sharp edge between the bottom of the circumferential groove and the gutter which reliably interrupts the film of the entrained liquid.

Bei einer anderen bevorzugten Ausführungsform ist vorgesehen, daß die Umfangsnut einen bogenförmigen Querschnitt aufweist, dabei kann vorgesehen sein, daß die Kontur der Umfangsnut gegenüber der Kontur der Umfangsfläche des Kolbens im Randbereich der Umfangsnut schräg verläuft.In another preferred embodiment it is provided that the circumferential groove has an arcuate cross-section, it can be provided be that the contour of the circumferential groove relative to the contour of the peripheral surface of the piston extends obliquely in the edge region of the circumferential groove.

Die Breite der Umfangsnut liegt bevorzugt zwischen 0,5 mm und 5 mm. Die Tiefe der Umfangsnut liegt bevorzugt zwischen 0,5 mm und 3 mm. The width of the circumferential groove is preferably between 0.5 mm and 5 mm. The Depth of the circumferential groove is preferably between 0.5 mm and 3 mm.

Es ist günstig, wenn im Sammelraum ein den Kolben umgebendes Distanzelement angeordnet ist, welches die Hochdruckdichtung und/oder die Öldichtung in axialer Richtung abstützt.It is advantageous if in the collecting space a spacer surrounding the piston is arranged, which is the high pressure seal and / or the oil seal supported in the axial direction.

Der Sammelraum kann einen Abfluß aufweisen, so daß die in ihm gesammelte Flüssigkeit beispielsweise der Saugseite der Pumpe wieder zugeführt wird.The collection space may have a drain, so that the collected in him Liquid is supplied, for example, the suction side of the pump again.

Die nachfolgende Beschreibung bevorzugter Ausführungsformen der Erfindung dient im Zusammenhang mit der Zeichnung der näheren Erläuterung. Es zeigen:

Figur 1:
eine Schnittansicht durch eine Taumelscheiben-Kolbenpumpe für ein Hochdruckreinigungsgerät;
Figur 2:
eine vergrößerte Schnittansicht des in Figur 1 mit A gekennzeichneten Teilbereiches, wobei der Kolben links und rechts der Mittellinie in unterschiedlichen Stellungen gezeigt ist;
Figur 3:
eine Teilansicht eines Kolbens mit einer abgeschrägten Kante der Umfangsnut;
Figur 4:
eine Ansicht ähnlich Figur 3 mit einer Umfangsnut mit rechteckförmigem Querschnitt;
Figur 5:
eine Ansicht ähnlich Figur 3 mit einer zusätzlichen Rinne am Boden der Umfangsnut und
Figur 6:
eine Ansicht ähnlich Figur 4 bei einer Umfangsnut mit bogenförmigem Querschnitt.
The following description of preferred embodiments of the invention is used in conjunction with the drawings for further explanation. Show it:
FIG. 1:
a sectional view through a swash plate piston pump for a high-pressure cleaner;
FIG. 2:
an enlarged sectional view of the marked in Figure 1 with A portion, the piston is shown on the left and right of the center line in different positions;
FIG. 3:
a partial view of a piston with a chamfered edge of the circumferential groove;
FIG. 4:
a view similar to Figure 3 with a circumferential groove of rectangular cross-section;
FIG. 5:
a view similar to Figure 3 with an additional groove at the bottom of the circumferential groove and
FIG. 6:
a view similar to Figure 4 at a circumferential groove with arcuate cross-section.

Die in der Zeichnung dargestellte Pumpe 1 ist ein Teil eines Hochdruckreinigungsgerätes, das in der Zeichnung nicht gezeigt ist, die Pumpe 1 wird angetrieben durch einen ebenfalls nicht dargestellten Elektromotor oder einen anderen Antriebsmotor, beispielsweise einen Motor für fossile Brennstoffe.The pump 1 shown in the drawing is part of a high-pressure cleaning device, which is not shown in the drawing, the pump 1 is driven by an electric motor also not shown or a another drive motor, such as a fossil fuel engine.

Die Pumpe 1 umfaßt ein Pumpengehäuse 2 mit einer Antriebskammer 3 und mit mehreren Pumpkammern 4, die jeweils über ein Saugventil 5 mit einer Saugleitung 6 und über ein Druckventil 7 mit einer Druckleitung 8 verbunden sind. In die Pumpkammer 4 taucht ein zylindrischer Kolben 9 ein, dessen anderes Ende durch eine Öffnung 10 in die Antriebskammer 3 eintaucht, in dieser Antriebskammer 3 befindet sich eine von dem Antriebsmotor angetriebene Taumelscheibe 11, gegen die der Kolben 9 mittels einer Druckfeder 12 angedrückt wird.The pump 1 comprises a pump housing 2 with a drive chamber 3 and with a plurality of pumping chambers 4, each having a suction valve 5 with a Suction line 6 and connected via a pressure valve 7 with a pressure line 8 are. In the pumping chamber 4 dips a cylindrical piston 9, the other End immersed through an opening 10 in the drive chamber 3, in this Drive chamber 3 is a driven by the drive motor Swash plate 11, against which the piston 9 is pressed by means of a compression spring 12 becomes.

Es sind mehrere derartige Kolben vorgesehen, im dargestellten Ausführungsbeispiel umfaßt die Pumpe 1 zwei derartige Kolben, der Aufbau ist bei beiden Kolben ähnlich gewählt, daher wird nachfolgend die Konstruktion nur an einem Kolben erörtert.There are several such piston provided, in the illustrated embodiment the pump 1 comprises two such pistons, the structure is in both Piston selected similar, therefore, the construction is only on one Piston discussed.

Im Eintrittsbereich des Kolbens 9 in die Pumpkammer 4 ist in einer Umfangsnut 13 des Pumpengehäuses 2 eine Hochdruckdichtung 14 angeordnet, die an der Umfangswand des zylindrischen Kolbens 9 dichtend anliegt und die Pumpkammer 4 im Eintrittsbereich des Kolbens 9 dadurch abdichtet.In the inlet region of the piston 9 in the pumping chamber 4 is in a circumferential groove 13 of the pump housing 2, a high-pressure seal 14 is arranged, the the peripheral wall of the cylindrical piston 9 sealingly abuts and the pumping chamber 4 thereby seals in the inlet region of the piston 9.

In ähnlicher Weise ist im Eintrittsbereich des Kolbens 9 in die Antriebskammer 3 eine Öldichtung 15 vorgesehen, die ebenfalls an der Umfangswand des Kolbens 9 dichtend anliegt und dadurch die Antriebskammer 3, die zumindest teilweise mit Öl gefüllt ist, abdichtet.Similarly, in the entry region of the piston 9 in the drive chamber 3, an oil seal 15 is also provided on the peripheral wall of the piston 9 sealingly abuts and thereby the drive chamber 3, the at least partially filled with oil, seals.

Die Umfangsnut 13 und die Aufnahme der Öldichtung 14 bilden Teil eines Ringraumes 16, der den Kolben 9 zwischen dessen Eintritt in die Pumpkammer 4 und dessen Eintritt in die Antriebskammer 3 umgibt, dieser Ringraum 16 steht mit einer Rückführleitung 17 in Verbindung, die in aus der Zeichnung nicht ersichtlicher Weise mit der Saugleitung 6 verbunden ist.The circumferential groove 13 and the receptacle of the oil seal 14 form part of a Annular space 16, the piston 9 between its entry into the pumping chamber 4 and whose entry into the drive chamber 3 surrounds, this annulus 16th is connected to a return line 17 in connection, in from the drawing not apparent manner is connected to the suction line 6.

In dem Ringraum 16 ist den Kolben 9 umgebend ein Distanzelement 18 angeordnet, welches sich sowohl an der Hochdruckdichtung14 als auch an der Öldichtung 15 abstützt und diese dadurch in axialer Richtung, d.h. in Verschieberichtung des Kolbens 9, festlegt.In the annular space 16, a spacer element 18 is surrounding the piston 9, which can be seen on both the high-pressure seal14 and the oil seal 15 and thereby supported in the axial direction, i. in the direction of displacement of the piston 9, determines.

In dem Bereich zwischen der Hochdruckdichtung 14 und der Öldichtung 15 ist in den Kolben 9 eine Umfangsnut 19 eingearbeitet, die bei der Hubbewegung des Kolbens 9 bei drehender Taumelscheibe 11 so zwischen Öldichtung 15 einerseits und Hochdruckdichtung 14 andererseits verschoben wird, daß sie beide Dichtungen nicht erreicht, der Umkehrpunkt liegt also jeweils vor einer der beiden Dichtungen. In Figur 2 ist die Umfangsnut 19 auf der linken Seite in der Nähe der Öldichtung dargestellt, auf der rechten Seiten in der Nähe der Hochdruckdichtung, die Verschiebung der Umfangsnut 19 entspricht dem Hub des Kolbens 9.In the area between the high pressure seal 14 and the oil seal 15 is in the piston 9, a circumferential groove 19 incorporated in the stroke movement of the piston 9 with rotating swash plate 11 between the oil seal 15th on the one hand and high-pressure seal 14 on the other hand is moved that they both seals not reached, the reversal point is so in front of each one the two seals. In FIG. 2, the circumferential groove 19 is on the left side in FIG shown near the oil seal, on the right side near the High pressure seal, the displacement of the circumferential groove 19 corresponds to the stroke of the piston 9.

Bei dem in Figur 2 dargestellten Ausführungsbeispiel hat die Umfangsnut 19 einen rechteckigen Querschnitt, im Bereich zwischen Seitenwand 20 der Umfangsnut 19 und der Umfangswand 21 des Kolbens 9 ist eine Abschrägung 22 vorgesehen. Die Breite der Umfangsnut in axialer Richtung kann beispielsweise zwischen 0,5 mm und 5 mm liegen, ihre Tiefe zwischen 0,5 mm und 3 mm. In the embodiment shown in Figure 2, the circumferential groove has 19th a rectangular cross-section, in the region between the side wall 20 of the circumferential groove 19 and the peripheral wall 21 of the piston 9 is a chamfer 22nd intended. The width of the circumferential groove in the axial direction, for example between 0.5 mm and 5 mm, their depth is between 0.5 mm and 3 mm.

Der Querschnitt der Umfangsnut 19 ist bei den Ausführungsbeispielen der Figuren 2 und 3 gleich, beim Ausführungsbeispiel der Figur 4 fehlt die Abschrägung 22, so daß sich im Übergangsbereich zwischen Seitenwand 20 und Umfangswand 21 eine scharfe Kante 23 ausbildet.The cross section of the circumferential groove 19 is in the embodiments of the figures 2 and 3 equal, in the embodiment of Figure 4 is missing the bevel 22, so that in the transition region between the side wall 20 and peripheral wall 21 forms a sharp edge 23.

Das Ausführungsbeispiel der Figur 5 unterscheidet sich von dem der Figur 3 dadurch, daß im Boden 24 der Umfangsnut 19 zusätzlich eine vertiefte, umlaufende Rinne 25 vorgesehen ist, die in dem dargestellten Ausführungsbeispiel einen rechteckigen Querschnitt aufweist und somit mit einer scharfen Kante 26 in den Boden 24 der Umfangsnut 19 einmündet.The embodiment of Figure 5 differs from that of Figure 3 in that in the bottom 24 of the circumferential groove 19 in addition a recessed, circumferential Channel 25 is provided, which in the illustrated embodiment has a rectangular cross section and thus with a sharp Edge 26 opens into the bottom 24 of the circumferential groove 19.

Die Breite der Rinne kann beispielsweise zwischen 0,5 mm und 5 mm liegen, deren Tiefe zwischen 0,5 mm und 3 mm.The width of the channel may for example be between 0.5 mm and 5 mm, their depth is between 0.5 mm and 3 mm.

Bei dem Ausführungsbeispiel der Figur 6 weist die Umfangsnut 19 eine bogenförmige Kontur 27 auf, die schräg in die Umfangswand 21 einmündet.In the embodiment of Figure 6, the circumferential groove 19 has an arcuate Contour 27, which opens obliquely into the peripheral wall 21.

Wesentlich ist bei allen Querschnittsformen der Umfangsnut 19, daß durch diese Umfangsnut 19 die kontinuierliche, zylindrische Umfangswand 21 des Kolbens 9 unterbrochen wird, so daß ein Flüssigkeitsfilm, der an der Hochdruckdichtung 14 vorbei längs der Umfangswand 21 aus der Pumpkammer 4 austritt, durch die Umfangsnut 19 unterbrochen wird, d.h. dieser Flüssigkeitsfilm kann sich nicht weiter fortsetzen bis zur Öldichtung 15, sondern dieser Film endet an der Umfangsnut 19, in der sich die Flüssigkeit sammelt, die aus der Pumpkammer 4 ausgetreten ist. Diese in der Umfangsnut 19 gesammelte Flüssigkeit wird dann über die Rückführleitung 17 aus dem Ringraum 16 abgeführt, der Ringraum 16 wirkt somit als Sammelraum. It is essential in all cross-sectional shapes of the circumferential groove 19 that through this Circumferential groove 19, the continuous, cylindrical peripheral wall 21 of the piston 9 is interrupted so that a liquid film attached to the high pressure seal 14 passes along the circumferential wall 21 from the pumping chamber 4, is interrupted by the circumferential groove 19, i. this liquid film can not continue until the oil seal 15, but this movie ends at the circumferential groove 19, in which the liquid collects, from the Pumping chamber 4 has leaked. This collected in the circumferential groove 19 Liquid is then removed via the return line 17 from the annular space 16, the annular space 16 thus acts as a collecting space.

In dem dargestellten Ausführungsbeispiel ist nur eine Umfangsnut 19 vorgesehen, grundsätzlich wäre es möglich, auch mehrere derartige Nuten nebeneinander im Kolben 9 anzuordnen, wobei in jedem Fall Voraussetzung ist, daß diese Umfangsnuten 19 nicht mit der Hochdruckdichtung 14 und der Öldichtung 15 in Kontakt kommen, so daß beim Betrieb diese Dichtungen immer nur an der durchgehenden, zylindrischen Umfangswand 21 anliegen, Beschädigungen der Dichtungen durch die Kanten der Umfangsnut 19 werden somit vermieden.In the illustrated embodiment, only one circumferential groove 19 is provided, In principle it would be possible, even several such grooves next to each other to arrange in the piston 9, in any case, a condition is that these circumferential grooves 19 not with the high pressure seal 14 and the oil seal 15 come into contact, so that when operating these seals only ever rest against the continuous, cylindrical peripheral wall 21, damage the seals by the edges of the circumferential groove 19 are thus avoided.

Claims (12)

  1. A pump (1) for a high-pressure cleaning appliance, with at least one piston (9) which is driven in a reciprocating manner and which enters a pumping chamber of a pump housing (2) on one side and a driving chamber (3) of the pump housing (2) on the other side, with a high-pressure seal (14) resting on the periphery of the piston (9) in the entry region of the piston (9) into the pumping chamber, with an oil seal (15) resting on the periphery of the piston (9) in the entry region of the piston (9) into the driving chamber (3), and with a collecting chamber (16) surrounding the piston (9) between the high-pressure seal (14) and the oil seal (15) for liquid flowing out of the pumping chamber past the high-pressure seal (14), characterized in that the piston (9) comprises at least one peripheral groove (19) in the region between the high-pressure seal (14) and the oil seal (15), and the high-pressure seal (14) and the oil seal (15) are spaced so far from each other that during the reciprocating movement of the piston (9) the peripheral groove (19) reaches neither the high-pressure seal (14) nor the oil seal (15).
  2. A pump according to Claim 1, characterized in that the peripheral groove (19) has a rectangular cross-section.
  3. A pump according to Claim 2, characterized in that the edge (22) between the peripheral face (21) of the piston (9) and the lateral wall (20) of the peripheral groove (19) is bevelled.
  4. A pump according to Claim 2, characterized in that the lateral wall (20) of the peripheral groove (19) is bevelled.
  5. A pump according to one of Claims 2 to 4, characterized in that the peripheral groove (19) has a continuous, depressed channel (25) in the central region of its bottom (24).
  6. A pump according to Claim 5, characterized in that the channel (25) has a rectangular cross-section.
  7. A pump according to Claim 1, characterized in that the peripheral groove (19) has a curved cross-section.
  8. A pump according to Claim 7, characterized in that the outline (27) of the peripheral groove (19) extends obliquely with respect to the outline of the peripheral face (21) of the piston (9).
  9. A pump according to one of the preceding Claims, characterized in that the width of the peripheral groove (19) is between 0·5 mm and 5 mm.
  10. A pump according to one of the preceding Claims, characterized in that the depth of the peripheral groove (19) is between 0.5 mm and 3 mm.
  11. A pump according to one of the preceding Claims, characterized in that a spacer element (18), which surrounds the piston (9) and which supports the high-pressure seal (14) and/or the oil seal (15) in the axial direction, is arranged in the collecting chamber (16).
  12. A pump according to one of the preceding Claims, characterized in that the collecting chamber (16) has an outlet (17).
EP03794866A 2002-08-30 2003-08-09 Pump for a high-pressure cleaning device Expired - Lifetime EP1532366B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10239943 2002-08-30
DE10239943A DE10239943C1 (en) 2002-08-30 2002-08-30 Pump for high-pressure cleaning device has reciprocating piston provided with peripheral channel between high-pressure seal and oil seal
PCT/EP2003/008875 WO2004025123A1 (en) 2002-08-30 2003-08-09 Pump for a high-pressure cleaning device

Publications (2)

Publication Number Publication Date
EP1532366A1 EP1532366A1 (en) 2005-05-25
EP1532366B1 true EP1532366B1 (en) 2005-10-26

Family

ID=28685387

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03794866A Expired - Lifetime EP1532366B1 (en) 2002-08-30 2003-08-09 Pump for a high-pressure cleaning device

Country Status (5)

Country Link
EP (1) EP1532366B1 (en)
AT (1) ATE307977T1 (en)
AU (1) AU2003263207A1 (en)
DE (2) DE10239943C1 (en)
WO (1) WO2004025123A1 (en)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITRE20080069A1 (en) * 2008-07-22 2010-01-23 Annovi Reverberi Spa '' PUMPING GROUP FOR PISTON PUMPS FOR HYDRO-CLEANING MACHINES ''
US8413911B2 (en) 2009-11-17 2013-04-09 Black & Decker Inc. Paint sprayer
US8651402B2 (en) 2009-11-17 2014-02-18 Black & Decker Inc. Adjustable nozzle tip for paint sprayer
WO2011062986A1 (en) 2009-11-17 2011-05-26 Black & Decker Inc. Paint sprayer
US8740111B2 (en) 2009-11-17 2014-06-03 Black & Decker Inc. Paint sprayer
US9149822B2 (en) 2009-11-17 2015-10-06 Black & Decker Inc. Quick release mechanism for paint sprayer
US8550376B2 (en) 2009-11-17 2013-10-08 Black & Decker Inc. Paint sprayer
IT201800006145A1 (en) * 2018-06-08 2019-12-08 VOLUMETRIC PISTON PUMP

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT8053423V0 (en) * 1980-07-24 1980-07-24 Annovi Reverberi Spa GUIDE AND SEALING COMPLEX FOR A PISTON OF A DIFFERENT PISTON TYPE PUMP
DE3702446A1 (en) * 1987-01-28 1988-08-11 Kaercher Gmbh & Co Alfred HIGH PRESSURE CLEANING DEVICE WITH A SWASHPLATE PISTON PUMP
JP2652376B2 (en) * 1987-04-17 1997-09-10 株式会社 丸山製作所 Reciprocating pump seal mechanism
KR0174395B1 (en) * 1994-03-31 1999-04-15 토니헬샴 Piston of a hydraulic pump motor having a pressure oil supply hole
DE4445522C2 (en) * 1994-12-20 1998-05-14 Kaercher Gmbh & Co Alfred Piston pump for a high pressure cleaning device
DE19859137C1 (en) * 1998-12-21 2000-05-18 Ferton Holding Sa High pressure medicinal injection unit includes piston advanced into pressure chamber by series of resilient impacts, forcing fluid out in series of impulses for precise low-volume dosing

Also Published As

Publication number Publication date
DE50301519D1 (en) 2005-12-01
WO2004025123A1 (en) 2004-03-25
EP1532366A1 (en) 2005-05-25
ATE307977T1 (en) 2005-11-15
AU2003263207A1 (en) 2004-04-30
DE10239943C1 (en) 2003-10-30

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