EP1511939B1 - Production of machine parts provided with a mineral casting - Google Patents

Production of machine parts provided with a mineral casting Download PDF

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Publication number
EP1511939B1
EP1511939B1 EP02779376A EP02779376A EP1511939B1 EP 1511939 B1 EP1511939 B1 EP 1511939B1 EP 02779376 A EP02779376 A EP 02779376A EP 02779376 A EP02779376 A EP 02779376A EP 1511939 B1 EP1511939 B1 EP 1511939B1
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EP
European Patent Office
Prior art keywords
casting
mineral
lining
peripheral housing
mineral casting
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EP02779376A
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German (de)
French (fr)
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EP1511939A1 (en
Inventor
Gero Zies
Günter ZARGES
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Duechting Pumpen Maschinenfabrik & Co KG GmbH
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Duechting Pumpen Maschinenfabrik & Co KG GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/4286—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps inside lining, e.g. rubber
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/915—Pump or portion thereof by casting or molding

Definitions

  • the invention relates to a process for the preparation of at least partially with Mineral casting lined machine parts, wherein the mineral casting in the liquid Condition in at least one serving as part of a mold housing element of the machine part is poured, so that the mineral cast after curing a lining element adapted to the inner contour of the housing element forms.
  • the present invention is based on the task, the previously known Further develop a method such that eliminates the disadvantages mentioned become.
  • a method is to be created by the invention, can be produced with the pump housing for centrifugal pumps, in which the made of mineral cast lining elements as exactly as possible to the inner Contour of the jacket are adapted without the risk that in the manufacture or operation of the pumps to destroy the Mineral casting comes.
  • This task is based on a method of the aforementioned Art solved by the fact that the inner surfaces of the housing element before the pouring be treated with a release agent.
  • the release agent When using the release agent is also ensured that the mineral casting during the casting process over the entire surface of the inner contour of the housing element adapts. Without any post-processing of the casting or the inner contour the housing element is a large-scale power transmission from the lining element ensured on the outer case.
  • the wall thickness of the lining element can in the method according to the invention usefully by a casting process in the housing element be set core.
  • the as part of the mold too Insert coming core, which determines the inner contour of the lining element, is removed after hardening or hardening of the mineral casting.
  • abrasive, erosive or corrosive media comes as mineral casting expediently a mixture of a binder with filler for Use, wherein the filler is a fine-grained wear and corrosion resistant Material, in particular silicon carbide, quartz sand, glass, Ceramic or a mixture of these materials.
  • the filler is a fine-grained wear and corrosion resistant Material, in particular silicon carbide, quartz sand, glass, Ceramic or a mixture of these materials.
  • Chemical resistance and wear resistance should be the mixture contain as much filler and as little binder as possible.
  • the Mineral cast mixture may be sufficient during the mixing and casting process
  • Cast metal mixture may be sufficient during the mixing and pouring process be kept liquid for a long time, then cured by selective heating to become.
  • Suitable Kunsarz hardener systems are as commercial products available.
  • a useful development of the method according to the invention results, when the housing member in the mineral casting protruding anchoring means having.
  • This is any kind of positive connection between the housing part and the lining element, by means of which, for example prevents the Mineralguß stresses from the housing part fall out. This can also be prevented by recesses in the housing part, in which the cast mineral casting anchors itself.
  • the anchoring means e.g. Also provided with a corresponding pocket wall element of the Housing part, detachable by means of suitable screwing of the housing part be designed.
  • the method according to the invention is particularly suitable Method for the manufacture of pump housings for centrifugal pumps.
  • the housing element in this case is a jacket housing part a volute casing of a centrifugal pump.
  • At least two interconnected, on the inner surface shell parts treated with the release agent are poured out with the mineral casting, wherein inside the jacket housing parts is a core, which specifies the wall thickness of the lining element during the casting process.
  • a core which specifies the wall thickness of the lining element during the casting process.
  • the jacket parts become separated from each other, whereupon that of the one-piece lining element destroyed and removed at least partially enclosed core can be.
  • the jacket housing parts are joined together again.
  • This approach has the advantage that the Mineralgußauscited the spiral housing is one-piece. A mutual sealing of the lining elements the respective housing parts is unnecessary.
  • the disadvantage is that the core, through which the shape of the impeller chamber of the centrifugal pump is specified after the casting is enclosed in the mineral casting, so that the core must be destroyed and can not be reused.
  • a procedure according to the following method steps offers At first, at least two on the inner surface with the release agent treated jacket housing parts individually poured with the mineral casting, wherein the wall thickness of the lining elements during the casting process respectively a core is given. After hardening or hardening of the mineral casting the core is taken. Then they are lined with the mineral casting Mantelgepliusemaschine joined together, the sealing surfaces of the lining elements be sealed. In this way, the core can be multiply be used. For the sealing preferably elastic seals used.
  • the jacket housing parts be poured individually, there is advantageously the possibility the formed by the shell housing parts and the respective core Mold form such that the lining elements in the Protruding sealing surfaces a few millimeters from the jacket housing parts.
  • the sealing surfaces of the lining elements with large Force are pressed together.
  • the lining elements firmly pressed from the inside to the shell housing parts, creating a good Power transmission ensured by the pumped fluid to the outer housing becomes.
  • the formed by the shell housing parts and the respective core Mold be formed such that the lining elements in the area the sealing surfaces behind the Verschraubungsbünden the casing housing parts lying back or flush with these. In this case will be only the forces caused by the elastic seals on the Transfer lining elements, which also ensures a safe application of the Mineral cast body ensures the inner surfaces of the casing housing parts can be.
  • a centrifugal pump can be produced, the at least one impeller and at least one wheel chamber receiving the impeller which at least partially with lining elements is lined with mineral casting, wherein the lining elements of a metallic shell casing are enclosed, consisting of at least two jacket housing parts exists, in which the lining elements are shed.
  • the centrifugal pump is according to the invention characterized in that between the outer surfaces of the lining elements and the inner surfaces of the Sheath housing parts a filled with a release agent gap exists.
  • FIG. 1 shows a dashed line Release agent layer 3.
  • a liquid release agent proven on a wax basis.
  • release agent T2 commercially Available "release agent T2" from Ebalta Kunststoff GmbH.
  • Figure 1a shows the state through the interconnected jacket housing parts 1, 2 and the Core 4 formed mold before the casting process.
  • the figure 1 b) is the Gap between the housing elements 1, 2 and the core 4 after the pouring process filled with mineral casting.
  • the mineral body molds on the inner contour of the casing housing parts 1, 2 adapted lining element 5, whose inner contour is predetermined by the core 4.
  • the core 4 is destroyed and removed.
  • the figure 1c) shows the final state of the manufacturing process. After removing the Kerns 4 remains enclosed by the lining element 5 cavity 6th back, which forms the impeller chamber of the centrifugal pump. Through the between the jacket housing parts 1, 2 and the lining element 5 remaining Release agent layer 3 is ensured that the lining element. 5 not firmly connected to the outer housing.
  • FIG. 2a shows the molds with the release agent layer 3 before the casting process.
  • the both jacket housing parts 1, 2 are poured out individually with mineral casting, in turn, the wall thickness of each formed by the mineral casting Lining element 5, as shown in Figure 2b), specified by the core 4 becomes. After hardening or hardening of the mineral casting are respectively the core 4, which is reusable in the process shown in Figure 2 is, and the plates 7, 8 removed.
  • FIG. 2 shows the final state of FIG mated jacket housing parts 1, 2 existing spiral housing.
  • the Impeller chamber 6 is sealed from two against each other by means of the sealing elements 9 Lined lining elements 5, which due to the Release agent layer 3 is not fixed to the metallic shell housing parts 1, 2 are connected.
  • FIGS. 3 and 4 show a volute casing of a centrifugal pump, which consists of two metallic outer shell housing parts 1 and 2 consists. That in the figures not shown impeller of the centrifugal pump is received by the impeller chamber 6, partially lined with lining elements 5 of mineral casting is. Between the outer surfaces of the lining elements 5 and the Inner surfaces of the shell housing parts 1, 2 is shown in phantom in FIG Release agent layer 3 to see, which ensures that no firm connection between the jacket housing parts 1, 2 and the lining elements 5 exists. Between the sealing surfaces of the lining elements are sealing elements 9 arranged. At the same time, it can be seen in FIG. 3 that the lining elements 5 positively received in the shell housing parts 1, 2 are.
  • FIG. 4 also shows gland collars 10, 11 of the jacket housing parts 1, 2 and a connecting flange 12 for the outlet of the centrifugal pump.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Casting Devices For Molds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

The invention relates to a method for the production of machine parts which are at least partially provided with a mineral casting. The mineral casting is carried out in a liquid state in at least one part of a housing element ( 1, 2 ) of the machine part acting as a casting mould, such that the mineral casting, after hardening, forms a lining element adapted to the inner contour of the housing element ( 1, 2 ). The aim of the invention is to enable the mineral cast lining elements ( 5 ) to be adapted as accurately as possible to the inner contour of the outer housing ( 1, 2 ) without any risk of destroying the mineral cast body ( 5 ) occurring when pumps are produced or operated. According to the invention, the inner surfaces of the housing element ( 1, 2 ) are treated with a separating means ( 3 ) prior to the casting out operation.

Description

Die Erfindung betrifft ein Verfahren zur Herstellung von zumindest teilweise mit Mineralguß ausgekleideten Maschinenteilen, wobei der Mineralguß im flüssigen Zustand in wenigstens ein als Teil einer Gießform dienendes Gehäuseelement des Maschinenteils gegossen wird, so daß der Mineralguß nach der Aushärtung ein an die Innenkontur des Gehäuseelementes angepaßtes Auskleidungselement bildet.The invention relates to a process for the preparation of at least partially with Mineral casting lined machine parts, wherein the mineral casting in the liquid Condition in at least one serving as part of a mold housing element of the machine part is poured, so that the mineral cast after curing a lining element adapted to the inner contour of the housing element forms.

Hoch korrosions- und verschleißfester Mineralguß für die Herstellung von monolithisch gegossenen Pumpengehäusen oder Pumpenteilen ist beispielsweise aus der DE 43 43 547 C1 bekannt.High corrosion and wear resistant mineral casting for the production of monolithic Cast pump housings or pump parts, for example known from DE 43 43 547 C1.

Aus der DE 297 23 409 U1 ist eine Kreiselpumpe für chemisch aggressive, erosive oder abrasive Medien bekannt, die nach dem eingangs genannten Verfahren herstellbar ist. Bei der vorbekannten Pumpe wird das Mantelgehäuse selbst als Teil der Gießform genutzt und mit dem Mineralguß ausgegossen. Dies hat den Vorteil, daß das Entformen entfällt und die durch den Guß gebildeten Auskleidungselemente des Pumpengehäuses an Ort und Stelle in dem Gehäuseteil verbleiben. Auf diese Weise wird ein Verbundteil aus dem metallischen Mantelgehäuse und dem aus Mineralguß bestehenden Auskleidungselement gebildet.From DE 297 23 409 U1 is a centrifugal pump for chemically aggressive, erosive or abrasive media known, according to the aforementioned method can be produced. In the prior art pump, the jacket housing itself used as part of the casting mold and poured out with the mineral casting. this has the advantage that the demolding is eliminated and the lining elements formed by the casting the pump housing in place in the housing part remain. In this way, a composite part of the metallic shell casing and formed of mineral casting lining element.

Die Herstellung von mit Mineralguß ausgekleideten Maschinenteilen gemäß dem in der DE 297 23 409 U1 vorgeschlagenen Verfahren hat eine Reihe von Nachteilen. Beim Aushärten des Mineralgusses kommt es nämlich unvermeidlich zu Reaktionsschwund, so daß der fest mit dem metallischen Mantelgehäuse verbundene Mineralgußkörper aufgrund seiner geringen Zugfestigkeit Risse bekommen kann. Bei unter Wärmezufuhr aushärtenden Bindemitteln besteht auch das Problem, daß bei großen Abmessungen des Mantelgehäuses bzw. des Mineralgußkörpers aufgrund der unterschiedlichen Wärmeleitfähigkeit und der thermischen Ausdehnungskoeffizienten Beschädigung während der Abkühlung entstehen können. Vergleichbare Probleme ergeben sich auch beim Betrieb von Kreiselpumpen der vorbekannten Art, wenn es zu Aufdehnungen des Pumpengehäuses durch dynamische Beanspruchung kommt. Bei größeren Pumpen sind Aufdehnungen von mehreren Millimetern keine Seltenheit, was zwangsläufig dazu führt, daß die fest mit dem Außengehäuse verbundenen spröden Mineralgußkörper zerstört werden.The production of mineral-lined machine parts according to the method proposed in DE 297 23 409 U1 has a number of Disadvantages. When curing the mineral casting, it is inevitable to reaction shrinkage, so that the solid with the metallic shell casing bonded mineral castings cracks due to its low tensile strength can. In case of thermosetting binders also exists the problem that with large dimensions of the shell or the Mineralgußkörpers due to the different thermal conductivity and the Thermal expansion coefficient Damage during cooling can arise. Comparable problems also arise in the operation of Centrifugal pumps of the known type, when there are expansions of the pump housing comes through dynamic stress. For larger pumps are expansions of several millimeters not uncommon, which inevitably leads to the fact that the brittle Mineralgußkörper firmly connected to the outer housing be destroyed.

Der vorliegenden Erfindung liegt die Aufgabenstellung zugrunde, das vorbekannte Verfahren derart weiterzubilden, daß die genannten Nachteile beseitigt werden. Insbesondere soll durch die Erfindung ein Verfahren geschaffen werden, mit dem Pumpengehäuse für Kreiselpumpen herstellbar sind, bei denen die aus Mineralguß bestehenden Auskleidungselemente möglichst exakt an die innere Kontur des Mantelgehäuses angepaßt sind, ohne daß die Gefahr besteht, daß es bei der Herstellung oder beim Betrieb der Pumpen zur Zerstörung der Mineralgußkörper kommt.The present invention is based on the task, the previously known Further develop a method such that eliminates the disadvantages mentioned become. In particular, a method is to be created by the invention, can be produced with the pump housing for centrifugal pumps, in which the made of mineral cast lining elements as exactly as possible to the inner Contour of the jacket are adapted without the risk that in the manufacture or operation of the pumps to destroy the Mineral casting comes.

Diese Aufgabenstellung wird ausgehend von einem Verfahren der eingangs genannten Art dadurch gelöst, daß die Innenflächen des Gehäuseelementes vor dem Ausgießen mit einem Trennmittel behandelt werden.This task is based on a method of the aforementioned Art solved by the fact that the inner surfaces of the housing element before the pouring be treated with a release agent.

Das erfindungsgemäße Verfahren hat die folgenden Vorteile:The method according to the invention has the following advantages:

Dadurch daß aufgrund der Verwendung des Trennmittels keine feste Verbindung zwischen dem Auskleidungselement und dem Gehäuseelement besteht, kann es nicht zu Zerstörungen des Mineralgußkörpers durch Temperaturunterschiede zwischen dem Gehäuseelement und dem Auskleidungselement kommen. Die durch die Temperaturunterschiede hervorgerufene unterschiedliche Wärmeausdehung kann von dem durch das Trennmittel erzeugten Spalt zwischen Gehäuseelement und Auskleidungselement aufgenommen werden. Thereby that due to the use of the release agent no solid connection between the lining element and the housing element, It can not destroy the mineral body by temperature differences come between the housing element and the lining element. The different caused by the temperature differences Thermal expansion may be due to the gap created by the release agent Housing element and lining element are added.

Außerdem werden Zerstörungen durch mögliche Aufdehungen des Maschinenteils vermieden.In addition, destruction due to possible expansion of the machine part avoided.

Bei der Herstellung von Pumpengehäusen für Kreiselpumpen nach dem erfindungsgemäßen Verfahren ist durch die Trennmittelschicht sichergestellt, daß aus dem Fördermedium keine Ionen durch den Mineralguß in das Gehäusematerial diffundieren können. Die Eindiffusion von Ionen könnte in dem Gehäusematerial nachteiligerweise chemische Reaktionen auslösen und durch Volumenzunahme die Mineralgußschicht sprengen oder das Außenmaterial schwächen.In the manufacture of pump housings for centrifugal pumps according to the invention Method is ensured by the release agent layer that from the medium no ions through the mineral cast in the housing material can diffuse. The diffusion of ions could occur in the housing material disadvantageously cause chemical reactions and by volume increase blow up the mineral casting layer or weaken the outer material.

Bei der Verwendung des Trennmittels ist ferner sichergestellt, daß sich der Mineralguß beim Gießvorgang vollflächig an die Innenkontur des Gehäuseelementes anpaßt. Ohne jede Nachbearbeitung des Gußkörpers oder der Innenkontur des Gehäuseelementes ist eine großflächige Kraftübertragung von dem Auskleidungselement auf das Außengehäuse gewährleistet.When using the release agent is also ensured that the mineral casting during the casting process over the entire surface of the inner contour of the housing element adapts. Without any post-processing of the casting or the inner contour the housing element is a large-scale power transmission from the lining element ensured on the outer case.

Die Wandstärke des Auskleidungselementes kann bei dem Verfahren gemäß der Erfindung sinnvollerweise durch einen beim Gießvorgang in dem Gehäuseelement befindlichen Kern vorgegeben werden. Der als Teil der Gießform zu Einsatz kommende Kern, der die innere Kontur des Auskleidungselementes bestimmt, wird nach dem An- oder Aushärten des Mineralgusses entfernt.The wall thickness of the lining element can in the method according to the invention usefully by a casting process in the housing element be set core. The as part of the mold too Insert coming core, which determines the inner contour of the lining element, is removed after hardening or hardening of the mineral casting.

Insbesondere für Maschinenteile, die gegen Abrasion, Erosion oder Korrosion geschützt werden sollen, wie dies beispielsweise bei Kreiselpumpen für entsprechend abrasive, erosive oder korrosive Medien der Fall ist, kommt als Mineralguß zweckmäßigerweise ein Gemisch aus einem Bindemittel mit Füllstoff zum Einsatz, wobei es sich bei dem Füllstoff um ein feinkörniges verschleiß- und korrosionsbeständiges Material, wie insbesondere Siliziumcarbid, Quarzsand, Glas, Keramik oder eine Mischung aus diesen Materialien, handelt. Zur Optimierung der chemischen Beständigkeit und der Verschleißfestigkeit sollte das Gemisch möglichst viel Füllstoff und möglichst wenig Bindemittel enthalten.Especially for machine parts that are resistant to abrasion, erosion or corrosion should be protected, as for example in centrifugal pumps for accordingly abrasive, erosive or corrosive media comes as mineral casting expediently a mixture of a binder with filler for Use, wherein the filler is a fine-grained wear and corrosion resistant Material, in particular silicon carbide, quartz sand, glass, Ceramic or a mixture of these materials. For optimization Chemical resistance and wear resistance should be the mixture contain as much filler and as little binder as possible.

Vorteilhaft ist es, bei dem erfindungsgemäßen Verfahren als Bindemittel ein unter Wärmezufuhr aushärtendes Kunstharz-Härtersystem zu verwenden. Auf diese Weise ist es möglich, den Aushärtevorgang gezielt zu beeinflussen. Das Mineralguß-Gemisch kann während des Misch- und Gießvorgangs ausreichend neralguß-Gemisch kann während des Misch- und Gießvorgangs ausreichend lange flüssig gehalten werden, um dann durch gezielte Beheizung ausgehärtet zu werden. Geeignete Kunsharz-Härtersysteme sind als kommerzielle Produkte erhältlich.It is advantageous in the inventive method as a binder under Heat supply hardening resin hardener system to use. To this Way, it is possible to influence the curing process targeted. The Mineral cast mixture may be sufficient during the mixing and casting process Cast metal mixture may be sufficient during the mixing and pouring process be kept liquid for a long time, then cured by selective heating to become. Suitable Kunsarz hardener systems are as commercial products available.

Eine sinnvolle Weiterbildung des Verfahrens gemäß der Erfindung ergibt sich, wenn das Gehäuseelement in den Mineralguß hineinragende Verankerungsmittel aufweist. Damit ist jede Art von formschlüssiger Verbindung zwischen dem Gehäuseteil und dem Auskleidungselement gemeint, durch welche beispielsweise verhindert wird, daß der Mineralgußkörper aus dem Gehäuseteil herausfällt. Dies kann auch durch Aussparungen im Gehäuseteil verhindert werden, in welchen sich sich der eingegossene Mineralguß verankert. Damit die Mineralgußschale trotzdem entnehmbar bleibt, können die Verankerungsmittel, z.B. auch ein mit einer entsprechenden Tasche versehenes Wandelement des Gehäuseteils, mittels geeigneter Verschraubung von dem Gehäuseteil lösbar gestaltet werden.A useful development of the method according to the invention results, when the housing member in the mineral casting protruding anchoring means having. This is any kind of positive connection between the housing part and the lining element, by means of which, for example prevents the Mineralgußkörper from the housing part fall out. This can also be prevented by recesses in the housing part, in which the cast mineral casting anchors itself. So that Mineral casting still removable, the anchoring means, e.g. Also provided with a corresponding pocket wall element of the Housing part, detachable by means of suitable screwing of the housing part be designed.

Wie oben beschrieben, eignet sich das Verfahren gemäß der Erfindung in besonderer Weise für die Herstellung von Pumpengehäusen für Kreiselpumpen. Bei dem Gehäuseelement handelt es sich in diesem Fall um eine Mantelgehäuseteil eines Spiralgehäuses einer Kreiselpumpe.As described above, the method according to the invention is particularly suitable Method for the manufacture of pump housings for centrifugal pumps. The housing element in this case is a jacket housing part a volute casing of a centrifugal pump.

Dabei ist es sinnvoll, gemäß den folgenden Verfahrensschritten vorzugehen:It makes sense to proceed according to the following process steps:

Zunächst werden wenigstens zwei miteinander verbundene, an der Innenfläche mit dem Trennmittel behandelte Mantelgehäuseteile mit dem Mineralguß ausgegossen, wobei sich im Inneren der Mantelgehäuseteile ein Kern befindet, welcher die Wandstärke des Auskleidungselementes beim Gießvorgang vorgibt. Nach dem An- oder Aushärten des Mineralgusses werden die Mantelgehäuseteile voneinander getrennt, woraufhin der von dem einteiligen Auskleidungselement zumindest teilweise umschlossene Kern zerstört und entfernt werden kann. Schließlich werden die Mantelgehäuseteile wieder zusammengefügt. Diese Vorgehen hat den Vorteil, daß die Mineralgußauskleidung des Spiralgehäuses einteilig ist. Eine gegenseitige Abdichtung der Auskleidungselemente der jeweiligen Gehäuseteile erübrigt sich dadurch. Nachteilig ist allerdings, daß der Kern, durch den die Form der Laufradkammer der Kreiselpumpe vorgegeben wird, nach dem Guß in den Mineralgußkörper eingeschlossen ist, so daß der Kern zerstört werden muß und nicht wiederverwendet werden kann.First, at least two interconnected, on the inner surface shell parts treated with the release agent are poured out with the mineral casting, wherein inside the jacket housing parts is a core, which specifies the wall thickness of the lining element during the casting process. After hardening or hardening of the mineral casting, the jacket parts become separated from each other, whereupon that of the one-piece lining element destroyed and removed at least partially enclosed core can be. Finally, the jacket housing parts are joined together again. This approach has the advantage that the Mineralgußauskleidung the spiral housing is one-piece. A mutual sealing of the lining elements the respective housing parts is unnecessary. The disadvantage, however, is that the core, through which the shape of the impeller chamber of the centrifugal pump is specified after the casting is enclosed in the mineral casting, so that the core must be destroyed and can not be reused.

Alternativ bietet sich ein Vorgehen gemäß den folgenden Verfahrensschritten an: Zunächst werden wenigstens zwei an der Innenfläche mit dem Trennmittel behandelte Mantelgehäuseteile einzeln mit dem Mineralguß ausgegossen, wobei die Wandstärke der Auskleidungselemente beim Gießvorgang jeweils durch einen Kern vorgegeben wird. Nach dem An- oder Aushärten des Mineralgusses wird der Kern entnommen. Dann werden die mit dem Mineralguß ausgekleideten Mantelgehäuseteile zusammengefügt, wobei die Dichtflächen der Auskleidungselemente abgedichtet werden. Auf diese Weise kann der Kern mehrfach verwendet werden. Für die Abdichtung werden vorzugsweise elastische Dichtungen verwendet.Alternatively, a procedure according to the following method steps offers At first, at least two on the inner surface with the release agent treated jacket housing parts individually poured with the mineral casting, wherein the wall thickness of the lining elements during the casting process respectively a core is given. After hardening or hardening of the mineral casting the core is taken. Then they are lined with the mineral casting Mantelgehäuseteile joined together, the sealing surfaces of the lining elements be sealed. In this way, the core can be multiply be used. For the sealing preferably elastic seals used.

Dadurch daß gemäß dem zuletzt beschriebenen Verfahren die Mantelgehäuseteile einzeln ausgegossen werden, besteht vorteilhafterweise die Möglichkeit, die durch die Mantelgehäuseteile und den jeweiligen Kern gebildete Gießform derart auszubilden, daß die Auskleidungselemente im Bereich der Dichtflächen einige Millimeter aus den Mantelgehäuseteilen herausragen. Beim Zusammenfügen und Verschrauben der erfindungsgemäß hergestellten Spiralgehäuseteile können so die Dichtflächen der Auskleidungselemente mit großer Kraft aufeinandergepreßt werden. Außerdem werden so die Auskleidungselemente fest von innen an die Mantelgehäuseteile gepreßt, wodurch eine gute Kraftübertragung von dem Fördermedium auf das Außengehäuse gewährleistet wird.Thereby that according to the last-described method, the jacket housing parts be poured individually, there is advantageously the possibility the formed by the shell housing parts and the respective core Mold form such that the lining elements in the Protruding sealing surfaces a few millimeters from the jacket housing parts. At the Assembly and screwing of the spiral housing parts produced according to the invention So can the sealing surfaces of the lining elements with large Force are pressed together. In addition, so are the lining elements firmly pressed from the inside to the shell housing parts, creating a good Power transmission ensured by the pumped fluid to the outer housing becomes.

Alternativ können die durch die Mantelgehäuseteile und den jeweiligen Kern gebildete Gießform derart ausgebildet sein, daß die Auskleidungselemente im Bereich der Dichtflächen hinter den Verschraubungsbünden der Mantelgehäuseteile zurückliegen oder mit diesen bündig abschließen. In diesem Fall werden nur die durch die elastischen Dichtungen hervorgerufenen Kräfte auf die Auskleidungselemente übertragen, wodurch ebenfalls ein sicheres Anlegen der Mineralgußkörper an die Innenflächen der Mantelgehäuseteile gewährleistet werden kann. Alternatively, the formed by the shell housing parts and the respective core Mold be formed such that the lining elements in the area the sealing surfaces behind the Verschraubungsbünden the casing housing parts lying back or flush with these. In this case will be only the forces caused by the elastic seals on the Transfer lining elements, which also ensures a safe application of the Mineral cast body ensures the inner surfaces of the casing housing parts can be.

Gemäß dem vorbeschriebenen Verfahren ist eine Kreiselpumpe herstellbar, die wenigstens ein Laufrad und wenigstens eine das Laufrad aufnehmende Laufradkammer aufweist, welche zumindest teilweise mit Auskleidungselementen aus Mineralguß ausgekleidet ist, wobei die Auskleidungselemente von einem metallischen Mantelgehäuse umschlossen sind, das aus wenigstens zwei Mantelgehäuseteilen besteht, in welche die Auskleidungselemente vergossen sind. Die Kreiselpumpe ist gemäß der Erfindung dadurch gekennzeichnet, daß zwischen den Außenflächen der Auskleidungselemente und der Innenflächen der Mantelgehäuseteile ein mit einem Trennmittel ausgefüllter Spalt besteht.According to the method described above, a centrifugal pump can be produced, the at least one impeller and at least one wheel chamber receiving the impeller which at least partially with lining elements is lined with mineral casting, wherein the lining elements of a metallic shell casing are enclosed, consisting of at least two jacket housing parts exists, in which the lining elements are shed. The centrifugal pump is according to the invention characterized in that between the outer surfaces of the lining elements and the inner surfaces of the Sheath housing parts a filled with a release agent gap exists.

Ausführungsbeispiele der Erfindung werden im folgenden anhand der Figuren erläutert. Es zeigen:

Figur 1
schematische Darstellung der Herstellung eines Spiralgehäuses für eine Kreiselpumpe nach einer ersten Variante des erfindungsgemäßen Verfahrens;
Figur 2
schematische Darstellung der Herstellung eines Spiralgehäuses für eine Kreiselpumpe nach einer zweiten Variante des erfindungsgemäßen Verfahrens;
Figur 3
Querschnittdarstellung eines Spiralgehäuses einer erfindungsgemäßen Kreiselpumpe;
Figur 4
Draufsicht auf das Spiralgehäuse gemäß Figur 3.
Embodiments of the invention are explained below with reference to the figures. Show it:
FIG. 1
schematic representation of the production of a spiral housing for a centrifugal pump according to a first variant of the method according to the invention;
FIG. 2
schematic representation of the production of a spiral housing for a centrifugal pump according to a second variant of the method according to the invention;
FIG. 3
Cross-sectional view of a spiral housing of a centrifugal pump according to the invention;
FIG. 4
Top view of the spiral housing according to FIG. 3

Der in der Figur 1 schematisch gezeigte Herstellungsvorgang geht aus von zwei miteinander verbundenen metallischen Mantelgehäuseteilen 1 und 2 eines Spiralgehäuses einer Kreiselpumpe. Die Innenflächen der Gehäuseelemente 1, 2 sind mit einem Trennmittel vorbehandelt. Die Figur 1 zeigt eine gestrichelt dargestellte Trennmittelschicht 3. Bei der Herstellung von Spiralgehäusen für Kreiselpumpen hat sich in der Praxis die Verwendung eines flüssigen Trennmittels auf Wachsbasis bewährt. Besonders geeignet ist beispielsweise das kommerziell erhältliche "Trennmittel T2" der Firma Ebalta Kunststoff GmbH. Wie in der Figur 1 gezeigt, befindet sich im Inneren des durch die verbundenen Mantelgehäuseteile 1, 2 gebildeten Hohlraums ein Kern 4. Die Figur 1a) zeigt den Zustand der durch die miteinander verbundenen Mantelgehäuseteile 1, 2 und den Kern 4 gebildeten Gießform vor dem Gießvorgang. Gemäß der Figur 1 b) ist der Zwischenraum zwischen den Gehäuseelementen 1, 2 und dem Kern 4 nach dem Gießvorgang mit Mineralguß ausgefüllt. Der Mineralgußkörper bildet ein an die Innenkontur der Mantelgehäuseteile 1, 2 angepaßtes Auskleidungselement 5, dessen Innenkontur durch den Kern 4 vorgegeben wird. Nach dem Anoder Aushärten des Mineralgusses wird der Kern 4 zerstört und entfernt. Die Figur 1c) zeigt den Endzustand des Herstellungsvorgangs. Nach Entfernen des Kerns 4 bleibt ein von dem Auskleidungselement 5 umschlossener Hohlraum 6 zurück, welcher die Laufradkammer der Kreiselpumpe bildet. Durch die zwischen den Mantelgehäuseteilen 1, 2 und dem Auskleidungselement 5 verbliebene Trennmittelschicht 3 ist sichergestellt, daß das Auskleidungselement 5 nicht fest mit dem Außengehäuse verbunden ist. Es kann entsprechend nicht zu Zerstörungen des Auskleidungselementes 5 durch Temperaturunterschiede zwischen den Mantelgehäuseteilen 1, 2 und dem Auskleidungselement 5 kommen. Die durch etwaige Temperaturunterschiede hervorgerufene unterschiedliche Wärmeausdehung kann von einem zwischen der Trennmittelschicht 3 und dem Auskleidungselement 5 entstandenen Spalt oder von der Trennmittelschicht 3 selbst aufgenommen werden. Das beschriebene Herstellungsverfahren stellt ferner sicher, daß ohne jede Nachbearbeitung des Auskleidungselemtentes 5 oder der Innenkontur der Mantelgehäuseteile 1, 2 eine großflächige Kraftübertragung von dem Auskleidungselement 5 auf das durch die Mantelgehäuseteile 1, 2 gebildete Außengehäuse gewährleistet ist.The manufacturing process shown schematically in Figure 1 is based on two interconnected metallic shell housing parts 1 and 2 of a spiral housing a centrifugal pump. The inner surfaces of the housing elements 1, 2 are pretreated with a release agent. FIG. 1 shows a dashed line Release agent layer 3. In the manufacture of spiral housings for centrifugal pumps has in practice the use of a liquid release agent proven on a wax basis. For example, it is particularly suitable commercially Available "release agent T2" from Ebalta Kunststoff GmbH. Like in the Figure 1 is located in the interior of the connected jacket housing parts 1, 2 cavity formed a core 4. Figure 1a) shows the state through the interconnected jacket housing parts 1, 2 and the Core 4 formed mold before the casting process. According to the figure 1 b) is the Gap between the housing elements 1, 2 and the core 4 after the pouring process filled with mineral casting. The mineral body molds on the inner contour of the casing housing parts 1, 2 adapted lining element 5, whose inner contour is predetermined by the core 4. After the Anoder Curing the mineral casting, the core 4 is destroyed and removed. The figure 1c) shows the final state of the manufacturing process. After removing the Kerns 4 remains enclosed by the lining element 5 cavity 6th back, which forms the impeller chamber of the centrifugal pump. Through the between the jacket housing parts 1, 2 and the lining element 5 remaining Release agent layer 3 is ensured that the lining element. 5 not firmly connected to the outer housing. It can not be too Destruction of the lining element 5 by temperature differences come between the jacket housing parts 1, 2 and the lining element 5. The different caused by any temperature differences Thermal expansion can of a between the release agent layer 3 and the lining element 5 resulting gap or of the release agent layer 3 yourself. The described production process further ensures that without any finishing of the lining element 5 or the inner contour of the jacket housing parts 1, 2 a large area Power transmission from the lining element 5 through the jacket housing parts 1, 2 formed outer housing is ensured.

Bei dem in der Figur 2 schematisch dargestellten Herstellungsverfahren werden zwei separate Gießformen eingesetzt, die aus dem oberen Mantelgehäuseteil 1 bzw. dem unteren Mantelgehäuseteil 2 bestehen. Die beiden Mantelgehäuseteile 1, 2 werden jeweils von einer Platte 7 bzw. 8 abgedeckt, an welchen jeweils ein Teil des Kerns 4 befestigt ist. Beide Mantelgehäuseteile 1, 2 sind an ihren inneren Oberflächen mit Trennmittel vorbehandelt. Die Figur 2a) zeigt die Gießformen mit der Trennmittelschicht 3 vor dem Gießvorgang. Die beiden Mantelgehäuseteile 1, 2 werden einzeln mit Mineralguß ausgegossen, wobei wiederum die Wandstärke des jeweils durch den Mineralgußkörper gebildeten Auskleidungselementes 5, wie in Figur 2b) gezeigt, durch den Kern 4 vorgegeben wird. Nach dem An- oder Aushärten des Mineralgusses werden jeweils der Kern 4, der bei dem in der Figur 2 gezeigten Verfahren wiederverwendbar ist, und die Platten 7, 8 entfernt. In diesem Zustand befinden sich die mit Mineralguß ausgekleideten Mantelgehäuseteile 1, 2 in der Figur 2c). Die Dichtflächen des Auskleidungselemente 5 des unteren Mantelgehäuseteils 2 werden mit elastischen Dichteelementen 9 abgedichtet, so daß das obere Mantelgehäuseteil 1 aufgesetzt werden kann. Die Figur 2 zeigt den Endzustand des aus den zusammengefügten Mantelgehäuseteilen 1, 2 bestehenden Spiralgehäuses. Die Laufradkammer 6 ist von zwei gegeneinander mittels der Dichtelemente 9 abgedichteten Auskleidungselementen 5 umschlossen, welche aufgrund der Trennmittelschicht 3 nicht fest mit den metallischen Mantelgehäuseteilen 1, 2 verbunden sind.In the production method shown schematically in Figure 2 are two separate molds used, consisting of the upper shell housing part. 1 or the lower shell housing part 2 consist. The two jacket housing parts 1, 2 are each covered by a plate 7 and 8, to which each part of the core 4 is attached. Both jacket housing parts 1, 2 are pretreated on their inner surfaces with release agent. FIG. 2a) shows the molds with the release agent layer 3 before the casting process. The both jacket housing parts 1, 2 are poured out individually with mineral casting, in turn, the wall thickness of each formed by the mineral casting Lining element 5, as shown in Figure 2b), specified by the core 4 becomes. After hardening or hardening of the mineral casting are respectively the core 4, which is reusable in the process shown in Figure 2 is, and the plates 7, 8 removed. In this condition are those with mineral casting lined shell housing parts 1, 2 in Figure 2c). The sealing surfaces of the lining elements 5 of the lower shell housing part 2 are with sealed elastic sealing elements 9, so that the upper shell housing part 1 can be placed. FIG. 2 shows the final state of FIG mated jacket housing parts 1, 2 existing spiral housing. The Impeller chamber 6 is sealed from two against each other by means of the sealing elements 9 Lined lining elements 5, which due to the Release agent layer 3 is not fixed to the metallic shell housing parts 1, 2 are connected.

Die Figuren 3 und 4 zeigen ein Spiralgehäuse einer Kreiselpumpe, das aus zwei metallischen äußeren Mantelgehäuseteilen 1 und 2 besteht. Das in den Figuren nicht dargestellte Laufrad der Kreiselpumpe wird von der Laufradkammer 6 aufgenommen, die teilweise mit Auskleidungselementen 5 aus Mineralguß ausgekleidet ist. Zwischen den Außenflächen der Auskleidungselemente 5 und den Innenflächen der Mantelgehäuseteile 1, 2 ist in der Figur 3 die gestrichelt dargestellte Trennmittelschicht 3 zu sehen, welche dafür sorgt, daß keine feste Verbindung zwischen den Mantelgehäuseteilen 1, 2 und den Auskleidungselementen 5 besteht. Zwischen den Dichtflächen der Auskleidungselemente sind Dichtelemente 9 angeordnet. Gleichzeitig ist in der Figur 3 zu sehen, daß die Auskleidungselemente 5 formschlüssig in den Mantelgehäuseteilen 1, 2 aufgenommen sind. Die Figur 4 zeigt ferner Verschraubungsbünde 10, 11 der Mantelgehäusteile 1, 2 sowie einen Anschlußflansch 12 für den Auslaß der Kreiselpumpe.Figures 3 and 4 show a volute casing of a centrifugal pump, which consists of two metallic outer shell housing parts 1 and 2 consists. That in the figures not shown impeller of the centrifugal pump is received by the impeller chamber 6, partially lined with lining elements 5 of mineral casting is. Between the outer surfaces of the lining elements 5 and the Inner surfaces of the shell housing parts 1, 2 is shown in phantom in FIG Release agent layer 3 to see, which ensures that no firm connection between the jacket housing parts 1, 2 and the lining elements 5 exists. Between the sealing surfaces of the lining elements are sealing elements 9 arranged. At the same time, it can be seen in FIG. 3 that the lining elements 5 positively received in the shell housing parts 1, 2 are. FIG. 4 also shows gland collars 10, 11 of the jacket housing parts 1, 2 and a connecting flange 12 for the outlet of the centrifugal pump.

Claims (11)

  1. A process for the production of machine parts which are at least partially lined with mineral casting, wherein the mineral casting is cast in the liquid condition into at least one housing element (1, 2) of the machine part, serving as part of a casting mould, so that after hardening the mineral casting forms a lining element (5) adapted to the internal contour of the housing element, characterised in that the inside surfaces of the housing element (1, 2) are treated prior to the pouring operation with a separating agent (3).
  2. A process according to claim 1 characterised in that the wall thickness of the lining element (5) is predetermined by a core (4) disposed in the housing element (1, 2) in the casting operation.
  3. A process according to claim 1 characterised in that the mineral casting used is a mixture of a binding agent with filler, wherein the filler is a fine-grain, wear-resistant and corrosion-resistant material such as in particular silicon carbide, quartz sand, glass, ceramic or a mixture of those materials.
  4. A process according to claim 3 characterised in that the binding agent used is a synthetic resin-hardener system which hardens under the application of heat.
  5. A process according to claim 1 characterised in that the housing element has anchoring means which project into the mineral casting or is otherwise connected in positively locking relationship to the lining element.
  6. A process according to one of the preceding claims characterised in that the housing element is a peripheral housing portion of a spiral casing of a rotary pump.
  7. A process according to claim 6 characterised by the following process steps:
    at least two peripheral housing portions (1, 2) which are connected together and which are treated at the inside surface with the separating agent (3) are filled with the mineral casting, wherein disposed in the interior of the peripheral housing portions is a core (4) which predetermines the wall thickness of the lining element (5) in the casting operation;
    after initial or final hardening of the mineral casting the peripheral housing portions (1, 2) are separated from each other;
    the core which is at least partly surrounded by the one-part lining element (5) is destroyed and removed; and
    the peripheral housing portions (1, 2) are assembled again.
  8. A process according to claim 6 characterised by the following process steps:
    at least two peripheral housing portions (1, 2) which are treated at the inside surface with the separating agent (3) are individually filled with the mineral casting, wherein the wall thickness of the lining element (5) is predetermined in the casting operation by a respective core (4);
    after initial or final hardening of the mineral casting the core (4) is removed; and
    the peripheral housing portions (1, 2) lined with the mineral casting are assembled, with the sealing surfaces of the lining elements (5) being sealed off.
  9. A process according to claim 8 characterised in that the casting mould formed by the peripheral housing portions (1, 2) and the respective core (4) are of such a configuration that in the region of the sealing surfaces the lining elements (5) project some millimetres out of the peripheral housing portions (1, 2).
  10. A process according to claim 8 characterised in that the casting mould formed by the peripheral housing portions (1, 2) and the respective core (4) are of such a configuration that in the region of the sealing surfaces the lining elements (5) are disposed behind the screw flanges (10, 11) of the peripheral housing portions (1, 2) or terminate flush.
  11. A rotary pump comprising at least one impeller and at least one impeller chamber (6) which accommodates the impeller and which is at least partially lined with lining elements (5) of mineral casting, wherein the lining elements (5) are enclosed by a metallic peripheral housing comprising at least two peripheral housing portions (1, 2) into which the lining elements (5) are cast, characterised in that a gap (3) filled with a separating agent exists between the outside surfaces of the lining elements (5) and the inside surfaces of the peripheral housing portions (1, 2).
EP02779376A 2002-09-19 2002-09-19 Production of machine parts provided with a mineral casting Expired - Lifetime EP1511939B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2002/010513 WO2004033919A1 (en) 2002-09-19 2002-09-19 Production of machine parts provided with a mineral casting

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EP1511939A1 EP1511939A1 (en) 2005-03-09
EP1511939B1 true EP1511939B1 (en) 2005-11-30

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US (1) US7329094B2 (en)
EP (1) EP1511939B1 (en)
AT (1) ATE311539T1 (en)
AU (1) AU2002342716A1 (en)
DE (1) DE50205144D1 (en)
WO (1) WO2004033919A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102004039172C5 (en) * 2004-08-12 2009-02-19 Nomig Gmbh Process for producing mineral cast-lined machine parts and use of the method
EP1855012A1 (en) * 2006-05-11 2007-11-14 IHC Holland IE N.V. Centrifugal pump having an inner casing and an outer casing
EP1906029B1 (en) * 2006-09-19 2009-12-16 IHC Holland IE B.V. Centrifugal pump having an inner casing and an outer casing
PL2315948T3 (en) 2008-06-13 2015-07-31 Weir Minerals Australia Ltd Pump casing with an adjustable side liner
DE102012221442B3 (en) * 2012-11-23 2014-02-27 PME Pumpen- und Modelltechnik GmbH Producing housing of pump partially coated with mineral casting, comprises e.g. producing coating from deformable and partially cured plate-shaped elements, applying elements on sections to be coated, and completely curing elements
DE102013004101B4 (en) 2013-03-11 2014-12-24 SICcast Mineralguß GmbH & Co. KG Composition, method of making a composite, use of the composition, and composite
CN110732656B (en) * 2019-10-21 2021-06-29 大连船用柴油机有限公司 White alloy casting method and tool for crosshead slide block of large low-speed marine diesel engine

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US3607600A (en) * 1969-07-15 1971-09-21 Hauck Mfg Co Composite molding process and product
SE411571B (en) * 1978-06-16 1980-01-14 Skega Ab wear lining
DE4012041C2 (en) * 1990-04-11 1996-06-13 Duechting Pumpen Maschf Gmbh High pressure centrifugal pump
DE4343547C1 (en) * 1993-12-20 1994-11-17 Duechting Pumpen Maschf Gmbh Method for the production of machine components from inorganic casting material
US5513954A (en) * 1994-06-10 1996-05-07 Envirotech Pumpsystems, Inc. Multilayer pump liner
DE29723409U1 (en) 1997-05-27 1998-09-10 H. Wernert & Co. oHG, 45476 Mülheim Centrifugal pump for chemically aggressive and / or erosive or abrasive fluids

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US20050241793A1 (en) 2005-11-03
WO2004033919A1 (en) 2004-04-22
US7329094B2 (en) 2008-02-12
DE50205144D1 (en) 2006-01-05
EP1511939A1 (en) 2005-03-09
AU2002342716A1 (en) 2004-05-04
ATE311539T1 (en) 2005-12-15

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