EP0849469B1 - Twin cylinder slurry pump with a pipe switch - Google Patents
Twin cylinder slurry pump with a pipe switch Download PDFInfo
- Publication number
- EP0849469B1 EP0849469B1 EP97120146A EP97120146A EP0849469B1 EP 0849469 B1 EP0849469 B1 EP 0849469B1 EP 97120146 A EP97120146 A EP 97120146A EP 97120146 A EP97120146 A EP 97120146A EP 0849469 B1 EP0849469 B1 EP 0849469B1
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- EP
- European Patent Office
- Prior art keywords
- sealing
- ring
- wire
- spring element
- pipe
- 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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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
- F04B7/00—Piston machines or pumps characterised by having positively-driven valving
- F04B7/0084—Component parts or details specially adapted therefor
- F04B7/0088—Sealing arrangements between the distribution members and the housing
- F04B7/0096—Sealing arrangements between the distribution members and the housing for pipe-type distribution members
Definitions
- the invention relates to a pipe switch for a two-cylinder thick matter pump with a swivel tube that can be swiveled in front of a cylinder-side spectacle plate, the plate on the glasses with one on the tube end of the swivel tube a fraction of its length to form a radial guide gap axially guided cutting ring is sealing, which cutting ring by a rubber-elastic ring-shaped sealing and spring element on the glasses plate is pressed, which is acted upon by the pressure of the medium on the inside Sealing and spring element on two mutually facing sealing and Support surfaces of the swivel tube and the cutting ring with bridging and sealing of the guide gap is present and, if necessary contains metallic spreader.
- the sealing and spring element has above all that Function of sealing the guide gap against access of liquid concrete from the interior of the swivel tube. It also helps the Cutting ring, even when depressurized, with a certain amount of preload is pressed against the glasses plate. Since the sealing and spring element in Above all, the interior of the swivel tube is exposed to the flow in suction operation, the risk that it is from its sealing seat in front of the guide gap lifted off and carried away by the flowing medium becomes. To avoid this, it has already been suggested in the rubber elastic Sealing and spring element a metallic expansion device to insert (DE-C 26 14 895).
- the known spreaders of this type are closed metal rings, vulcanized into the sealing and spring ring become. Special devices are required for this.
- the closed metal ring is inelastic in the radial direction and therefore with the slightest overstress to plastic deformation tends to leak and a ring loss in the flow can lead. This applies all the more as in the course of the pumping process Area of the sealing and support surfaces can form mortar deposits that lead to an additional load on the sealing and spring element.
- a sealing ring designed, for example, as an O-ring
- it is in itself known (EP-A 0450392), in the central channel of a ring hose elastomeric material at least one helically coiled wire spring to arrange.
- the wire spring is designed there as a coil spring, whose screw axis extends in the circumferential direction of the central channel.
- Such a spring arrangement is relatively soft and not for use in Two-cylinder thick matter pumps determined and suitable. Also prepares embedding the spring element in the central duct manufacturing technology Problems.
- the invention is based on the object, the known Pipe diverter of the type specified at the outset to improve that the sealing and spring element is simply manufactured and repaired on site can not be lost in all operating conditions can.
- the sealing and spring element is an annularly closed round tube made of rubber-elastic material, in the central channel helically wound, with its turns in the circumferential direction of the central channel, a wire ring made of stiff elastic that is open at its ends Material is arranged.
- the wire ring exists, for example made of spring steel or a glass fiber reinforced plastic wire. He points expediently 1.5 to 2 wire turns lying against each other.
- a major advantage of the open, preferably made of spring steel Wire rings is that it changes diameter within certain limits of the sealing and spring element allowed and that the spreading forces can be adjusted by selecting the spring material.
- a sealing and spring element is the on Round or open tube made of rubber-elastic at a jacket opening Material on the turns of the open at its ends, helical bent wire ring until it is completely in the Hose channel is embedded. Then the open ends of the Hose or the hose opening including the wire ring together connected and sealed, for example with a vulcanizing solution or a suitable glue or using Welded temperature and pressure.
- Another preferred embodiment of the invention provides that at least one of the sealing and support surfaces of the swivel tube or the cutting ring in sections as diverging towards the other sealing and supporting surface Conical surface is formed, the conical surface at least in longitudinal section partially concavely curved and / or via a concave ring step in pass over a cylindrical guide surface delimiting the guide gap can.
- a sliding layer of a water-repellent Material preferably made of polytetrafluoroethylene (PTFE) are coated.
- PTFE polytetrafluoroethylene
- the two-cylinder slurry pump shown in sections in the drawing is at the mouths of the feed cylinder 10 on the side the rear wall 12 of a material feed container 14 by one with two Apertures 16 for the passage of material provided glasses-shaped wear plate (Glasses plate 18) covered.
- glasses-shaped wear plate Glasses plate 18
- On the inside of the material hopper 14 is an S-shaped swivel tube 20 with its a cutting ring 22 end face in front of the eyeglass plate 18 by means of a Swivel shaft 24 can be pivoted back and forth about a horizontal axis arranged that its cylinder-side opening alternately in front of the two openings 16 of the glasses plate 18 and the other Opens opening 16 to the inside of the material feed container 14.
- the pivot tube 20 and the cutting ring 22 are in the space between their mutually facing sealing and support surfaces 46, 48 by one bridged rubber-elastic ring-shaped sealing and spring element 50, that with its outwardly facing surface 54 the radial guide gap 52 opposite between the cylindrical centering surface 26 and the centering ring 28 seals the medium in the pipe and that in the area its inner surface 56 is subjected to the hydraulic pressure of the pumped medium becomes.
- the sealing and spring element 50 consists of one on one Butt joint ring-shaped round tube 58 made of rubber, in the central channel 60 of a spring steel wire with a number of turns of 1.9 wound radial spring 64 open at its chamfered ends 62 as Spreading device is arranged.
- the sealing and support surface 48 of the cutting ring 22 has one for Swivel tube 20 towards conical section 66, which has a concave Ring step 68 in the cylindrical guide surface delimiting the guide gap 52 70 passes.
- the sealing and support surfaces 46, 48 are with a water-repellent, abrasion-resistant coating, preferably made of polytetrafluoroethylene (PTFE) coated, which prevents that during the conveyor operation can harden mortar.
- PTFE polytetrafluoroethylene
- the invention relates to a pipe switch for a two-cylinder slurry pump, especially for one Concrete pump.
- the tube switch has one in front of a cylinder-side spectacle plate 18 pivotable pivot tube 20, which on the glasses plate 18 with one on the tube end of the swivel tube 20 with a fraction of it Length axially guided to form a radial guide gap 52
- Cutting ring 22 rests sealingly, which cutting ring 22 by an annular Sealing and spring element 50 is pressed onto the eyeglass plate 18, wherein the sealing and Spring element 50 on two mutually facing sealing and support surfaces 46, 48 of the swivel tube 20 and the cutting ring 22 with bridging and Sealing of the guide gap 52 is present.
- Sealing and spring element 50 an annularly closed round tube made of rubber-elastic material, in its central channel helically wound wire ring 64 open at its ends stiff elastic material is arranged.
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- Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
Die Erfindung betrifft eine Rohrweiche für eine Zweizylinder-Dickstoffpumpe mit einem vor einer zylinderseitigen Brillenplatte verschwenkbaren Schwenkrohr, das an der Brillen platte mit einem auf dem Rohrende des Schwenkrohrs mit einem Bruchteil seiner Länge unter Bildung eines radialen Führungsspalts axial geführten Schneidring dichtend anliegt, welcher Schneidring durch ein kautschukelastisches ringförmiges Dicht- und Federelement auf die Brillenplatte gedrückt ist, wobei das vom Druck des Fördermediums innenseitig beaufschlagte Dicht- und Federelement an zwei einander zugewandten Dichtund Stützflächen des Schwenkrohrs und des Schneidrings unter Überbrückung und Abdichtung des Führungsspalts anliegt und eine gegebenenfalls metallische Spreizvorrichtung enthält.The invention relates to a pipe switch for a two-cylinder thick matter pump with a swivel tube that can be swiveled in front of a cylinder-side spectacle plate, the plate on the glasses with one on the tube end of the swivel tube a fraction of its length to form a radial guide gap axially guided cutting ring is sealing, which cutting ring by a rubber-elastic ring-shaped sealing and spring element on the glasses plate is pressed, which is acted upon by the pressure of the medium on the inside Sealing and spring element on two mutually facing sealing and Support surfaces of the swivel tube and the cutting ring with bridging and sealing of the guide gap is present and, if necessary contains metallic spreader.
Bei bekannten Zweizylinder-Dickstoffpumpen dieser Art (DE-C 26 14 895) greift das S- oder C-förmige Schwenkrohr der Rohrweiche in einen Materialaufgabebehälter ein und ist dort mit seiner den Schneidring tragenden Stirnseite vor der die Mündungen der Förderzylinder bildenden Brillenplatte mittels eines Schwenkmechanismus um eine horizontale Achse so hin- und herverschwenkbar angeordnet, daß seine zylinderseitige Öffnung abwechselnd vor die beiden Öffnungen der Brillenplatte gelangt und die jeweils andere Öffnung zum Inneren des Materialaufgabebehälters freigibt. Für den druckdichten Anschluß des Schwenkrohrs an der Brillenplatte ist der Schneidring auf dem freien Ende des Schwenkrohrs axial verschiebbar geführt. An seinem der Brillenplatte gegenüberliegenden Ende ist das Schwenkrohr an ein Förderrohr angeschlossen. Das Dicht- und Federelement hat vor allem die Funktion einer Abdichtung des Führungsspalts gegenüber Zutritt von Flüssigbeton aus dem Schwenkrohrinneren. Es trägt außerdem dazu bei, daß der Schneidring auch im drucklosen Zustand unter einer gewissen Vorspannung gegen die Brillenplatte gedrückt wird. Da das Dicht- und Federelement im Inneren des Schwenkrohrs dem Förderstrom ausgesetzt ist, besteht vor allem beim Saugbetrieb die Gefahr, daß es von seinem Dichtsitz vor dem Führungsspalt abgehoben und vom vorbeiströmenden Fördermedium mitgerissen wird. Um dies zu vermeiden, wurde bereits vorgeschlagen, in das kautschukelastische Dicht- und Federelement eine metallische Spreizvorrichtung einzulegen (DE-C 26 14 895). Die bekannten Spreizvorrichtungen dieser Art sind geschlossene Metallringe, die in den Dicht- und Federring einvulkanisiert werden. Hierzu sind Spezialvorrichtungen erforderlich. Hinzu kommt, daß der geschlossenen Metallring in radialer Richtung unelastisch ist und daher bei der geringsten Überbeanspruchung zu einer plastischen Verformung neigt, die zu Undichtigkeiten und zu einem Ringverlust im Förderstrom führen kann. Dies gilt umso mehr, als im Verlauf des Pumpvorgangs sich im Bereich der Dicht- und Stützflächen Mörtelablagerungen bilden können, die zu einer zusätzlichen Belastung des Dicht- und Federelements führen.In known two-cylinder thick matter pumps of this type (DE-C 26 14 895) grips the S- or C-shaped swivel tube of the pipe switch in a material feed container and is there with its end face carrying the cutting ring in front of the glasses plate forming the mouths of the delivery cylinders by means of a swivel mechanism so that it can be swung back and forth about a horizontal axis arranged that its cylinder-side opening alternately in front of the two openings of the glasses plate and the other Opens the opening to the inside of the material feed container. For the pressure tight The cutting ring is the connection of the swivel tube to the glasses plate guided axially displaceably on the free end of the swivel tube. On his the swivel tube is at the end opposite the spectacle plate Delivery pipe connected. The sealing and spring element has above all that Function of sealing the guide gap against access of liquid concrete from the interior of the swivel tube. It also helps the Cutting ring, even when depressurized, with a certain amount of preload is pressed against the glasses plate. Since the sealing and spring element in Above all, the interior of the swivel tube is exposed to the flow in suction operation, the risk that it is from its sealing seat in front of the guide gap lifted off and carried away by the flowing medium becomes. To avoid this, it has already been suggested in the rubber elastic Sealing and spring element a metallic expansion device to insert (DE-C 26 14 895). The known spreaders of this type are closed metal rings, vulcanized into the sealing and spring ring become. Special devices are required for this. Come in addition, that the closed metal ring is inelastic in the radial direction and therefore with the slightest overstress to plastic deformation tends to leak and a ring loss in the flow can lead. This applies all the more as in the course of the pumping process Area of the sealing and support surfaces can form mortar deposits that lead to an additional load on the sealing and spring element.
Bei einem beispielsweise als O-Ring ausgebildeten Dichtring ist es an sich bekannt (EP-A 0450392), in dem Zentralkanal eines Ringschlauchs aus elastomerem Material mindestens eine schraubenförmig gewundene Drahtfeder anzuordnen. Die Drahtfeder ist dort als Schraubenfeder ausgebildet, deren Schraubenachse sich in Umfangsrichtung des Zentralkanals erstreckt. Eine solche Federanordnung ist relativ weich und nicht für den Einsatz in Zweizylinder-Dickstoffpumpen bestimmt und geeignet. Außerdem bereitet das Einbetten des Federelements in den Zentralkanal herstellungstechnische Probleme.In the case of a sealing ring designed, for example, as an O-ring, it is in itself known (EP-A 0450392), in the central channel of a ring hose elastomeric material at least one helically coiled wire spring to arrange. The wire spring is designed there as a coil spring, whose screw axis extends in the circumferential direction of the central channel. Such a spring arrangement is relatively soft and not for use in Two-cylinder thick matter pumps determined and suitable. Also prepares embedding the spring element in the central duct manufacturing technology Problems.
Ausgehend hiervon liegt der Erfindung die Aufgabe zugrunde, die bekannte Rohrweiche der eingangs angegeben Art dahingehend zu verbessern, daß das Dicht- und Federelement einfach auch vor Ort hergestellt und repariert werden kann und bei allen vorkommenden Betriebszuständen nicht verlorengehen kann. Proceeding from this, the invention is based on the object, the known Pipe diverter of the type specified at the outset to improve that the sealing and spring element is simply manufactured and repaired on site can not be lost in all operating conditions can.
Zur Lösung dieser Aufgabe wird gemäß der Erfindung vorgeschlagen, daß das Dicht- und Federelement einen ringförmig geschlossenen Rundschlauch aus kautschukelastischem Material aufweist, in dessen Zentralkanal ein schraubenförmig gewundener, mit seinen Windungen in Umfangsrichtung des Zentralkanals verlaufender an seinen Enden offener Drahtring aus steifelastischem Material angeordnet ist. Der Drahtring besteht beispielsweise aus Federstahl oder einem glasfaserverstärkten Kunststoffdraht. Er weist zweckmäßig 1,5 bis 2 gegeneinander anliegende Drahtwindungen auf.To solve this problem it is proposed according to the invention that the sealing and spring element is an annularly closed round tube made of rubber-elastic material, in the central channel helically wound, with its turns in the circumferential direction of the central channel, a wire ring made of stiff elastic that is open at its ends Material is arranged. The wire ring exists, for example made of spring steel or a glass fiber reinforced plastic wire. He points expediently 1.5 to 2 wire turns lying against each other.
Ein wesentlicher Vorteil des offenen, vorzugsweise aus Federstahl bestehenden Drahtrings besteht darin, daß er in gewissen Grenzen Durchmesserveränderungen des Dicht- und Federelements erlaubt und daß die Spreizkräfte durch die Auswahl des Federmaterials einstellbar sind.A major advantage of the open, preferably made of spring steel Wire rings is that it changes diameter within certain limits of the sealing and spring element allowed and that the spreading forces can be adjusted by selecting the spring material.
Zur Herstellung eines solchen Dicht- und Federelements wird der an seinen Enden oder an einer Mantelöffnung offene Rundschlauch aus kautschukelastischem Material auf die Windungen des an seinen Enden offenen, schraubenförmig gebogenen Drahtring aufgezogen, bis dieser vollständig in den Schlauchkanal eingebettet ist. Sodann werden die offenen Enden des Schlauches oder die Schlauchöffnung unter Einschluß des Drahtrings miteinander verbunden und verschlossen, beispielsweise mit einer Vulkanisierlösung oder einem geeigneten Kleber verklebt oder unter Anwendung von Temperatur und Druck verschweißt.To produce such a sealing and spring element is the on Round or open tube made of rubber-elastic at a jacket opening Material on the turns of the open at its ends, helical bent wire ring until it is completely in the Hose channel is embedded. Then the open ends of the Hose or the hose opening including the wire ring together connected and sealed, for example with a vulcanizing solution or a suitable glue or using Welded temperature and pressure.
Eine weitere bevorzugte Ausgestaltung der Erfindung sieht vor, daß zumindest eine der Dicht- und Stützflächen des Schwenkrohrs oder des Schneidrings abschnittsweise als zur anderen Dicht- und Stützfläche hin divergierende Konusfläche ausgebildet ist, wobei die Konusfläche im Längsschnitt zumindest partiell konkav gekrümmt und/oder über eine konkave Ringstufe in eine den Führungsspalt begrenzende zylindrische Führungsfläche übergehen kann.Another preferred embodiment of the invention provides that at least one of the sealing and support surfaces of the swivel tube or the cutting ring in sections as diverging towards the other sealing and supporting surface Conical surface is formed, the conical surface at least in longitudinal section partially concavely curved and / or via a concave ring step in pass over a cylindrical guide surface delimiting the guide gap can.
Zur Vermeidung von Ablagerungen im Bereich der Stütz- und Führungsflächen können diese mit einer Gleitschicht aus einem wasserabstoßendem Material, vorzugsweise aus Polytetraflourethylen (PTFE) überzogen werden.To avoid deposits in the area of the support and guide surfaces can this with a sliding layer of a water-repellent Material, preferably made of polytetrafluoroethylene (PTFE) are coated.
Mit den erfindungsgemäßen Maßnahmen ist es möglich, herkömmliche dickwandige Gummischläuche, wie sie in Flüssigkeits- oder Hydraulikleitungen zum Einsatz kommen, zu einem wirkungsvollen Dicht- und Federelement umzufunktionieren, indem in den entsprechend abgelängten Schlauch ein offener Drahtring eingebracht wird.With the measures according to the invention it is possible to use conventional thick-walled Rubber hoses, such as those found in fluid or hydraulic lines are used to create an effective sealing and spring element to repurpose by inserting it into the correspondingly cut hose open wire ring is inserted.
Im folgenden wird die Erfindung anhand eines in der Zeichnung in schematischer Weise dargestellten Ausführungsbeispiels näher erläutert. Es zeigen
- Fig. 1
- einen Längsschnitt durch eine Rohrweiche mit S-Rohr;
- Fig. 2
- einen Ausschnitt aus Fig. 1 in vergrößerter Darstellung
- Fig. 3a und b
- eine Seitenansicht und eine Schnittdarstellung des Dicht- und Federelements nach Fig. 2;
- Fig. 4 a und b
- eine Seitenansicht und eine Schnittdarstellung der aus einem schraubenförmig gewickelten Draht bestehenden Spreizvorrichtung des Dicht- und Federelements.
- Fig. 1
- a longitudinal section through a pipe switch with S-pipe;
- Fig. 2
- a section of Fig. 1 in an enlarged view
- 3a and b
- a side view and a sectional view of the sealing and spring element of FIG. 2;
- 4 a and b
- a side view and a sectional view of the existing from a helically wound wire spreading device of the sealing and spring element.
Die in der Zeichnung ausschnittweise dargestellte Zweizylinder-Dickstoffpumpe
ist an den Mündungen der Förderzylinder 10 auf der Seite
der Rückwand 12 eines Materialaufgabebehälters 14 durch eine mit zwei
Öffnungen 16 für den Materialdurchtritt versehenen brillenförmige Verschleißplatte
(Brillenplatte 18) abgedeckt. Auf der Innenseite des Materialaufgabebehälters
14 ist ein S-förmig gebogenes Schwenkrohr 20 mit seiner
einen Schneidring 22 tragenden Stirnseite vor der Brillenplatte 18 mittels einer
Schwenkwelle 24 um eine horizontale Achse so hin- und herverschwenkbar
angeordnet, daß seine zylinderseitige Öffnung abwechselnd
vor die beiden Öffnungen 16 der Brillenplatte 18 gelangt und die jeweils andere
Öffnung 16 zum Inneren des Materialaufgabebehälters 14 freigibt. Für
den druckdichten Anschluß des Schwenkrohrs 20 an die Brillenplatte 18 ist
auf der zylindrischen Zentrierfläche 26 des Schwenkrohrs 20 der Schneidring
22 mit seinem axial überstehenden Zentrierring 28 axial verschiebbar gelagert.
Der Verschiebeweg ist durch einen Axialanschlag 30 am Schwenkrohr
20 begrenzt. An seinem dem Schneidring 22 gegenüberliegenden Ende ist
das Schwenkrohr 20 in einem über eine Druckrohrdichtung 30 durch die
betreffende Wand 34' des Materialaufgabebehälters 14 hindurchgeführten
Druckrohrlager 36 gelagert und mündet dort in ein Förderrohr 38. Die Betätigung
des Schwenkrohrs 20 erfolgt über einen mit hydraulischen Mitteln 40
betätigbaren Schalthebel 42, der die am Wellenlager 44 an der Behälterrückwand
12 gelagerte Schwenkwelle 24 antreibt.The two-cylinder slurry pump shown in sections in the drawing
is at the mouths of the
Das Schwenkrohr 20 und der Schneidring 22 sind im Zwischenraum zwischen
ihren einander zugewandten Dicht- und Stützflächen 46, 48 von einem
kautschukelastischen ringförmigen Dicht- und Federelement 50 überbrückt,
das mit seiner nach außen weisenden Fläche 54 den radialen Führungsspalt
52 zwischen der zylindrischen Zentrierfläche 26 und dem Zentrierring 28 gegenüber
dem Fördermedium im Rohrinneren abdichtet und das im Bereich
seiner Innenfläche 56 mit dem hydraulischen Druck des Fördermediums beaufschlagt
wird. Das Dicht- und Federelement 50 besteht aus einem an einer
Stoßstelle ringförmig zusammengeklebten Rundschlauch 58 aus Gummi, in
dessen Zentralkanal 60 eine aus Federstahldraht mit einer Windungszahl
von 1,9 gewickelte, an ihren angefasten Enden 62 offene Radialfeder 64 als
Spreizvorrichtung angeordnet ist. The
Die Dicht- und Stützfläche 48 des Schneidrings 22 weist einen zum
Schwenkrohr 20 hin konischen Abschnitt 66 auf, der über eine konkave
Ringstufe 68 in die den Führungsspalt 52 begrenzende zylindrische Führungsfläche
70 übergeht. Die Dicht- und Stützflächen 46, 48 sind mit einem
wasserabstoßenden, abriebfesten Überzug vorzugsweise aus Polytetrafluorethylen
(PTFE) beschichtet, der verhindert, daß sich während des Förderbetriebs
aushärtender Mörtel ablagern kann.The sealing and
Zusammenfassend ist folgendes festzustellen: Die Erfindung bezieht sich auf
eine Rohrweiche für eine Zweizylinder-Dickstoffpumpe insbesondere für eine
Betonpumpe. Die Rohrweiche weist ein vor einer zylinderseitigen Brillenplatte
18 verschwenkbares Schwenkrohr 20 auf, das an der Brillenplatte 18 mit
einem auf dem Rohrende des Schwenkrohrs 20 mit einem Bruchteil seiner
Länge unter Bildung eines radialen Führungsspalts 52 axial geführten
Schneidring 22 dichtend anliegt, welcher Schneidring 22 durch ein ringförmiges
Dicht- und Federelement 50 auf die Brillenplatte 18 gedrückt ist, wobei
das vom Druck des Fördermediums innennseitig beaufschlagte Dicht- und
Federelement 50 an zwei einander zugewandten Dicht- und Stützflächen 46,
48 des Schwenkrohrs 20 und des Schneidrings 22 unter Überbrückung und
Abdichtung des Führungsspalts 52 anliegt. Erfindungsgemäß weist das
Dicht- und Federelement 50 einen ringförmig geschlossenen Rundschlauch
aus kautschukelastischem Material auf, in dessen zentralem Kanal ein
schraubenförmig gewundener, an seinen Enden offener Drahtring 64 aus
steifelastischem Material angeordnet ist.In summary, the following can be stated: The invention relates to
a pipe switch for a two-cylinder slurry pump, especially for one
Concrete pump. The tube switch has one in front of a cylinder-
Claims (11)
- Pipe distributing guide for a twin-cylinder slurry pump comprising a swing pipe (20), which is swingable in front of a cylinder-side gland plate (18) and is applied sealingly against the gland plate (18) via a cutting ring (22), which extends axially with a fraction of its length on the pipe end of the swing pipe (20) so as to form a radial guide gap (52) and is pressed onto the gland plate (18) by means of a rubber-elastic annular sealing and spring element (50), wherein the sealing and spring element (50) loaded at the inside by the pressure of the pumping medium is applied against two mutually opposing sealing and supporting faces (46, 48) of the swing pipe (20) and of the cutting ring (22) so as to bridge and seal the guide gap (52) and contains an optionally metal expansion apparatus (64), characterized in that the sealing and spring element (50) comprises a circular tube (58) of rubber-elastic material, which is closed to form a ring and in the central channel (60) of which is disposed a helically wound wire ring (64) of rigid-elastic material, which is open at its ends and the turns of which extend in peripheral direction of the central channel (60).
- Pipe distributing guide according to claim 1, characterized in that the wire ring (64) comprises 1.5 to 2 mutually adjacent wire turns.
- Pipe distributing guide according to claim 1 or 2, characterized in that the wire ring (64) is made of spring steel.
- Pipe distributing guide according to claim 1 or 2, characterized in that the wire ring (64) is made of glass-fibre-reinforced plastic wire.
- Pipe distributing guide according to one of claims 1 to 4, characterized in that at least one of the sealing and supporting faces (46, 48) is coated with a non-stick layer of a water-repellent material, preferably of polytetrafluoroethylene.
- Sealing and spring element for sealing a pipe distributing guide in twin-cylinder slurry pumps, comprising a ring of rubber-elastic material, wherein the ring comprises a circular tube (58), in the central channel (60) of which is disposed a helically wound wire spring, which is open at its ends (62), characterized in that the wire spring takes the form of a wire ring (64) of rigid-elastic material, the turns of which extend in peripheral direction of the central channel (60).
- Sealing and spring element according to claim 6, characterized in that the wire ring (64) comprises 1.5 to 2 mutually adjacent wire turns.
- Sealing and spring element according to claim 6 or 7, characterized in that the wire ring (64) is made of spring steel.
- Sealing and spring element according to claim 6 or 7, characterized in that the wire ring (64) is made of glass-fibre-reinforced plastic wire.
- Method of manufacturing a sealing and spring element for sealing a pipe distributing guide in twin-cylinder slurry pumps, characterized in that a circular tube of rubber-elastic material, which is open at its ends or at a lateral surface opening and has a central channel (60), is pulled onto the turns of a helically wound wire ring (64), which is open at its ends, and that the open ends of the circular tube or the tube opening are then connected to one another or closed, with simultaneous enclosure of the wire ring.
- Method according to claim 10, characterized in that the tube ends or the lateral surface opening are glued or welded together.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19654023 | 1996-12-21 | ||
| DE19654023A DE19654023A1 (en) | 1996-12-21 | 1996-12-21 | Diverter for a two-cylinder thick matter pump |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0849469A2 EP0849469A2 (en) | 1998-06-24 |
| EP0849469A3 EP0849469A3 (en) | 1999-02-10 |
| EP0849469B1 true EP0849469B1 (en) | 2003-04-23 |
Family
ID=7816015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97120146A Expired - Lifetime EP0849469B1 (en) | 1996-12-21 | 1997-11-18 | Twin cylinder slurry pump with a pipe switch |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0849469B1 (en) |
| DE (2) | DE19654023A1 (en) |
| ES (1) | ES2195070T3 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19934452A1 (en) * | 1999-07-27 | 2001-02-01 | Putzmeister Ag | silo |
| DE102004015181A1 (en) * | 2004-03-25 | 2005-10-13 | Putzmeister Ag | Material feed container for a slurry pump |
| GB2416569A (en) | 2004-07-27 | 2006-02-01 | Clarke Uk Ltd | Method of and a pump for pumping drill cuttings |
| CH704904B1 (en) | 2011-05-06 | 2014-08-29 | Bra Turbo Ing Ag | Apparatus and method for removal of material deposits from water bodies. |
Family Cites Families (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1049648B (en) * | 1959-01-29 | |||
| DD63238A (en) * | ||||
| DE575348C (en) * | 1930-03-15 | 1933-04-27 | Hydrierwerke Akt Ges Deutsche | Process for improving the odor of wooden spirit oils |
| DE1653456A1 (en) * | 1966-10-28 | 1971-04-15 | Alfred Heidt | Combined piston conveyor pump with additional compressor and compressed air flow channel, especially for mixed concrete and semi-liquid conveyed material, which consists of a mixture of solid and liquid material |
| US3897088A (en) * | 1973-12-12 | 1975-07-29 | Amp Inc | Sealing boot |
| DE2614895C3 (en) * | 1976-04-07 | 1987-01-22 | Karl Dipl.-Ing. 7000 Stuttgart Schlecht | Concrete pump pipe switch |
| DE7614221U1 (en) * | 1976-05-05 | 1976-10-07 | Fa. Paul Hammerstein, 2000 Hamburg | DEVICE FOR SEALING PLUG-IN CONNECTIONS OF PIPES |
| CH600206A5 (en) * | 1976-05-18 | 1978-06-15 | Meister H & Co | |
| FR2385011A1 (en) * | 1977-03-23 | 1978-10-20 | Joint Francais | COMPOSITE GASKET |
| DE2903749C2 (en) * | 1979-02-01 | 1983-11-10 | Karl Dipl.-Ing. 7000 Stuttgart Schlecht | Piston pump with an S-shaped swivel tube |
| DE7910958U1 (en) * | 1979-04-14 | 1980-06-19 | Wibau Industrie Und Verwaltung Gmbh, 6466 Gruendau | TASK CONTAINER WITH FLANGE PROTECTION MADE OF ELASTIC MATERIAL AS COMPONENT OF MOBILE CONCRETE PUMPS |
| US4310161A (en) * | 1979-06-15 | 1982-01-12 | Halliburton Services | Inflatable packer element |
| DE3216057A1 (en) * | 1982-04-29 | 1983-11-03 | Siemens AG, 1000 Berlin und 8000 München | Pressure-compensating seal, in particular for cable fittings |
| DE3414180A1 (en) * | 1984-04-14 | 1985-10-24 | Georg Prinzing GmbH & Co KG Betonformen- und Maschinenfabrik, 7902 Blaubeuren | Sealing device for abutting components which are at least approximately pipe-shaped, in particular for concrete mouldings |
| US4586718A (en) * | 1985-09-06 | 1986-05-06 | Crane Co. | Sealing assembly with floating gland means for rotatable shafts |
| US5160122A (en) * | 1990-03-20 | 1992-11-03 | Peter J. Balsells | Coil spring with an elastomer having a hollow coil cross section |
| DE3918879A1 (en) * | 1989-06-09 | 1990-12-13 | Wolfgang Werner | Combined seal and expansion compensator - has one or more extensible and deformable hollow pieces each with one or more hollow cavities |
| US5294133A (en) * | 1991-09-10 | 1994-03-15 | The United States Of America As Represented By The Secretary Of The Army | Fluid-filled O-ring for maintaining a seal under low temperature conditions |
-
1996
- 1996-12-21 DE DE19654023A patent/DE19654023A1/en not_active Withdrawn
-
1997
- 1997-11-18 EP EP97120146A patent/EP0849469B1/en not_active Expired - Lifetime
- 1997-11-18 ES ES97120146T patent/ES2195070T3/en not_active Expired - Lifetime
- 1997-11-18 DE DE59709903T patent/DE59709903D1/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| DE19654023A1 (en) | 1998-06-25 |
| EP0849469A2 (en) | 1998-06-24 |
| DE59709903D1 (en) | 2003-05-28 |
| ES2195070T3 (en) | 2003-12-01 |
| EP0849469A3 (en) | 1999-02-10 |
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