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EP1511939A1 - Production of machine parts provided with a mineral casting - Google Patents

Production of machine parts provided with a mineral casting

Info

Publication number
EP1511939A1
EP1511939A1 EP02779376A EP02779376A EP1511939A1 EP 1511939 A1 EP1511939 A1 EP 1511939A1 EP 02779376 A EP02779376 A EP 02779376A EP 02779376 A EP02779376 A EP 02779376A EP 1511939 A1 EP1511939 A1 EP 1511939A1
Authority
EP
European Patent Office
Prior art keywords
casting
housing
mineral
housing parts
lining
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.)
Granted
Application number
EP02779376A
Other languages
German (de)
French (fr)
Other versions
EP1511939B1 (en
Inventor
Gero Zies
Günter ZARGES
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Duechting Pumpen Maschinenfabrik & Co KG GmbH
Original Assignee
Duechting Pumpen Maschinenfabrik & Co KG GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by Duechting Pumpen Maschinenfabrik & Co KG GmbH filed Critical Duechting Pumpen Maschinenfabrik & Co KG GmbH
Publication of EP1511939A1 publication Critical patent/EP1511939A1/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
    • 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 production of machine parts lined at least partially with mineral casting, the mineral casting in the liquid state being poured into at least one housing element of the machine part serving as part of a casting mold, so that the mineral casting after curing has a lining adapted to the inner contour of the housing element - element forms.
  • a centrifugal pump for chemically aggressive, erosive or abrasive media is known from DE 29723409 U1, which can be produced by the method mentioned at the beginning.
  • the jacket housing itself is used as part of the casting mold and is poured out with the mineral casting. This has the advantage that there is no demolding and the lining elements of the pump housing formed by the casting remain in place in the housing part. In this way, a composite part is formed from the metallic casing and the liner element made of mineral casting.
  • the object of the present invention is to develop the previously known method in such a way that the disadvantages mentioned are eliminated.
  • the invention is intended to provide a method with which pump housings for centrifugal pumps can be produced, in which the lining elements consisting of mineral casting are matched as precisely as possible to the inner contour of the casing, without the risk that it will be produced or The mineral castings are destroyed when the pumps are operated.
  • This task is solved on the basis of a method of the type mentioned in the introduction in that the inner surfaces of the housing element are treated with a release agent before pouring.
  • the mineral casting body cannot be destroyed by temperature differences between the housing element and the lining element.
  • the different thermal expansion caused by the temperature differences can be absorbed by the gap created by the separating agent between the housing element and the lining element. Destruction caused by possible expansion of the machine part is also avoided.
  • the separating agent layer ensures that no ions can diffuse from the pumping medium through the mineral casting into the housing material.
  • the diffusion of ions in the housing material could disadvantageously trigger chemical reactions and, due to the increase in volume, blow up the mineral cast layer or weaken the outer material.
  • the release agent When using the release agent, it is also ensured that the mineral casting adapts over the entire surface to the inner contour of the housing element during the casting process. Without any reworking of the cast body or the inner contour of the housing element, a large-area power transmission from the lining element to the outer housing is guaranteed.
  • the wall thickness of the lining element can usefully be specified by a core located in the housing element during the casting process.
  • the core used as part of the casting mold, which determines the inner contour of the lining element, is removed after the mineral casting has hardened or hardened.
  • a mixture of a binder with filler is expediently used as the mineral casting, whereby the filler is a fine-grained wear and corrosion resistant material, such as silicon carbide, quartz sand, glass, ceramic or a mixture of these materials.
  • the mixture should contain as much filler and as little binder as possible.
  • the mineral casting mixture can be sufficient during the mixing and pouring process
  • General casting mixture can be kept liquid for a sufficiently long time during the mixing and pouring process, in order then to be hardened by targeted heating.
  • Suitable synthetic resin hardening systems are available as commercial products.
  • the housing element has anchoring means which protrude into the mineral casting.
  • the anchoring means e.g. a wall element of the housing part provided with a corresponding pocket can also be made detachable from the housing part by means of a suitable screw connection.
  • the method according to the invention is particularly suitable for the production of pump housings for centrifugal pumps.
  • the housing element is a casing housing part of a spiral housing of a centrifugal pump.
  • At least two mutually connected jacket housing parts treated on the inner surface with the release agent are poured out with the mineral casting, a core being located in the interior of the jacket housing parts, which specifies the wall thickness of the lining element during the casting process.
  • the shell housing parts are separated from one another, whereupon the core at least partially enclosed by the one-piece lining element can be destroyed and removed.
  • the casing parts are put together again.
  • This procedure has the advantage that the mineral cast lining of the spiral housing is in one piece.
  • a mutual sealing of the lining elements of the respective housing parts is unnecessary.
  • the core which determines the shape of the impeller chamber of the centrifugal pump, is enclosed in the mineral cast body after casting, so that the core must be destroyed and cannot be reused.
  • a procedure according to the following process steps is possible: First, at least two casing parts treated on the inner surface with the release agent are poured out individually with the mineral casting, the wall thickness of the lining elements being predetermined by a core during the casting process. After the mineral casting has hardened or hardened, the core is removed. Then the casing housing parts lined with the mineral casting are joined together, the sealing surfaces of the lining elements being sealed. In this way, the core can be used several times. Elastic seals are preferably used for the sealing.
  • the jacket housing parts are poured out individually in accordance with the method described last, there is advantageously the possibility of designing the casting mold formed by the jacket housing parts and the respective core in such a way that the lining elements protrude a few millimeters from the jacket housing parts in the region of the sealing surfaces.
  • the sealing surfaces of the lining elements can be pressed against one another with great force.
  • the lining elements are thus pressed firmly from the inside onto the casing housing parts, which ensures good power transmission from the pumping medium to the outer housing.
  • the casting mold formed by the casing housing parts and the respective core can be designed such that the lining elements in the area of the sealing surfaces lie behind the screwed collars of the casing housing parts or are flush with them. In this case, only the forces caused by the elastic seals are transmitted to the lining elements, as a result of which a secure application of the mineral castings to the inner surfaces of the casing housing parts can also be ensured.
  • a centrifugal pump can be produced which has at least one impeller and at least one impeller chamber which receives the impeller and which is at least partially lined with lining elements made of mineral casting, the lining elements being enclosed by a metallic shell housing which consists of at least two shell housing parts which are encapsulated in the lining elements.
  • the centrifugal pump according to the invention is characterized in that there is a gap filled with a separating agent between the outer surfaces of the lining elements and the inner surfaces of the casing housing parts.
  • FIG. 1 shows a 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
  • Figure 2 shows a schematic representation of the manufacture of a volute for a centrifugal pump according to a second variant of the method according to the invention
  • FIG. 3 shows a cross section of a volute casing of a centrifugal pump according to the invention
  • FIG. 1 Figure 4 top view of the spiral housing according to
  • FIG. 1 shows a separating agent layer 3 shown in dashed lines.
  • the use of a liquid, wax-based separating agent has proven itself in practice.
  • the commercial The currently available "release agent T2" from Ebalta Kunststoff GmbH As shown in FIG. 1, there is a core 4 inside the cavity formed by the connected casing housing parts 1, 2.
  • FIG. 1a shows the state of the casing casing parts connected by the casing 1, 2 and the mold 4 formed prior to the casting process, as shown in FIG.
  • Figure 1c) shows the final state of the manufacturing process enclosed cavity 6 back, which forms the impeller chamber of the centrifugal pump
  • the release agent layer 3 remaining in the casing housing parts 1, 2 and the lining element 5 ensures that the lining element 5 is not firmly connected to the outer housing.
  • the lining element 5 cannot be destroyed by temperature differences between the casing housing parts 1, 2 and the lining element 5.
  • the different thermal expansion caused by any temperature differences can be absorbed by a gap formed between the release agent layer 3 and the lining element 5 or by the release agent layer 3 itself.
  • the manufacturing method described further ensures that without any reworking of the lining element 5 or the inner contour of the casing housing parts 1, 2, a large-area power transmission from the lining element 5 to the outer casing formed by the casing housing parts 1, 2 is ensured.
  • two separate casting molds are used, which consist of the upper casing part 1 and the lower casing part 2, respectively.
  • the two shell housing parts 1, 2 are each covered by a plate 7 or 8, to which a part of the core 4 is fastened.
  • Both jacket housing parts 1, 2 are pretreated on their inner surfaces with release agent.
  • Figure 2a) shows the molds with the release agent layer 3 before the casting process.
  • the two shell housing parts 1, 2 are poured out individually with mineral casting, again the wall thickness of the lining element 5 formed by the mineral cast body, as shown in FIG. 2b), is predetermined by the core 4.
  • the core 4 which can be reused in the method shown in FIG. 2, and the plates 7, 8 are removed.
  • FIG. 2 shows the final state of the spiral housing consisting of the assembled casing housing parts 1, 2.
  • the impeller chamber 6 is enclosed by two lining elements 5 which are sealed off from one another by means of the sealing elements 9 and which, owing to the separating agent layer 3, are not firmly connected to the metallic shell housing parts 1, 2.
  • FIG. 3 and 4 show a spiral housing of a centrifugal pump, which consists of two metallic outer shell housing parts 1 and 2.
  • the impeller of the centrifugal pump not shown in the figures, is received by the impeller chamber 6, which is partially lined with lining elements 5 made of mineral casting.
  • the separating layer 3 shown in dashed lines can be seen in FIG. 3, which ensures that there is no firm connection between the casing housing parts 1, 2 and the lining elements 5.
  • Sealing elements 9 are arranged between the sealing surfaces of the lining elements.
  • FIG. 3 shows screw collars 10, 11 of the casing housing parts 1, 2 and a connecting flange 12 for the outlet of the centrifugal pump.

Landscapes

  • 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 said 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

Herstellung von mit Mineralguß ausgekleideten Maschinenteilen Manufacture of machine parts lined with mineral casting
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 Auskleidungs- element bildet.The invention relates to a process for the production of machine parts lined at least partially with mineral casting, the mineral casting in the liquid state being poured into at least one housing element of the machine part serving as part of a casting mold, so that the mineral casting after curing has a lining adapted to the inner contour of the housing element - 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.Highly corrosion and wear resistant mineral casting for the production of monolithically cast pump housings or pump parts is known for example from DE 43 43 547 C1.
Aus der DE 29723409 U1 ist eine Kreiselpumpe für chemisch aggressive, ero- sive 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.A centrifugal pump for chemically aggressive, erosive or abrasive media is known from DE 29723409 U1, which can be produced by the method mentioned at the beginning. In the case of the known pump, the jacket housing itself is used as part of the casting mold and is poured out with the mineral casting. This has the advantage that there is no demolding and the lining elements of the pump housing formed by the casting remain in place in the housing part. In this way, a composite part is formed from the metallic casing and the liner element made of mineral casting.
Die Herstellung von mit Mineralguß ausgekleideten Maschinenteilen gemäß dem in der DE 297 23 409 U1 vorgeschlagenen Verfahren hat eine Reihe vonThe production of machine parts lined with mineral casting according to the method proposed in DE 297 23 409 U1 has a number of
Nachteilen. Beim Aushärten des Mineralgusses kommt es nämlich unvermeid- lieh 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 zwangsläu- fig dazu führt, daß die fest mit dem Außengehäuse verbundenen spröden Mineralgußkörper zerstört werden.Disadvantages. When the mineral casting hardens, there is an inevitable loss of reaction, so that it is firmly attached to the metallic casing connected mineral cast body can get cracks due to its low tensile strength. In the case of binders which cure under the addition of heat, there is also the problem that, in the case of large dimensions of the jacket housing or of the mineral cast body, damage can occur during cooling due to the different thermal conductivity and the coefficient of thermal expansion. Comparable problems also arise in the operation of centrifugal pumps of the previously known type when the pump housing is expanded due to dynamic stress. With larger pumps, expansions of several millimeters are not uncommon, which inevitably leads to the fact that the brittle mineral cast bodies which are firmly connected to the outer casing are 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 wer- den, 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 object of the present invention is to develop the previously known method in such a way that the disadvantages mentioned are eliminated. In particular, the invention is intended to provide a method with which pump housings for centrifugal pumps can be produced, in which the lining elements consisting of mineral casting are matched as precisely as possible to the inner contour of the casing, without the risk that it will be produced or The mineral castings are destroyed when the pumps are operated.
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 solved on the basis of a method of the type mentioned in the introduction in that the inner surfaces of the housing element are treated with a release agent before pouring.
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 Verbin- düng 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 zwi- sehen Gehäuseelement und Auskleidungselement aufgenommen werden. Außerdem werden Zerstörungen durch mögliche Aufdehungen des Maschinenteils vermieden.Because there is no fixed connection between the lining element and the housing element due to the use of the release agent, the mineral casting body cannot be destroyed by temperature differences between the housing element and the lining element. The different thermal expansion caused by the temperature differences can be absorbed by the gap created by the separating agent between the housing element and the lining element. Destruction caused by possible expansion of the machine part is also 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.When producing pump housings for centrifugal pumps according to the method according to the invention, the separating agent layer ensures that no ions can diffuse from the pumping medium through the mineral casting into the housing material. The diffusion of ions in the housing material could disadvantageously trigger chemical reactions and, due to the increase in volume, blow up the mineral cast layer or weaken the outer material.
Bei der Verwendung des Trennmittels ist ferner sichergestellt, daß sich der Mi- neralguß 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, it is also ensured that the mineral casting adapts over the entire surface to the inner contour of the housing element during the casting process. Without any reworking of the cast body or the inner contour of the housing element, a large-area power transmission from the lining element to the outer housing is guaranteed.
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.In the method according to the invention, the wall thickness of the lining element can usefully be specified by a core located in the housing element during the casting process. The core used as part of the casting mold, which determines the inner contour of the lining element, is removed after the mineral casting has hardened or hardened.
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.In particular for machine parts that are to be protected against abrasion, erosion or corrosion, as is the case, for example, with centrifugal pumps for correspondingly abrasive, erosive or corrosive media, a mixture of a binder with filler is expediently used as the mineral casting, whereby the filler is a fine-grained wear and corrosion resistant material, such as silicon carbide, quartz sand, glass, ceramic or a mixture of these materials. To optimize chemical resistance and wear resistance, the mixture should 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 die- se 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 method according to the invention to use a synthetic resin hardener system that cures under the addition of heat. In this way it is possible to specifically influence the curing process. The mineral casting mixture can be sufficient during the mixing and pouring process General casting mixture can be kept liquid for a sufficiently long time during the mixing and pouring process, in order then to be hardened by targeted heating. Suitable synthetic resin hardening systems are available as commercial products.
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 further development of the method according to the invention results if the housing element has anchoring means which protrude into the mineral casting. This means any type of positive connection between the housing part and the lining element, which, for example, prevents the mineral cast body from falling out of the housing part. This can also be prevented by recesses in the housing part, in which the cast mineral casting is anchored. So that the mineral cast shell remains removable, the anchoring means, e.g. a wall element of the housing part provided with a corresponding pocket can also be made detachable from the housing part by means of a suitable screw connection.
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 for the production of pump housings for centrifugal pumps. In this case, the housing element is a casing housing part of a spiral housing of a centrifugal pump.
Dabei ist es sinnvoll, gemäß den folgenden Verfahrensschritten vorzugehen:It makes sense to proceed according to the following procedural 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 Spi- ralgehäuses einteilig ist. Eine gegenseitige Abdichtung der Auskleidungselemente der jeweiligen Gehäuseteile erübrigt sich dadurch. Nachteilig ist aller- dings, 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 of all, at least two mutually connected jacket housing parts treated on the inner surface with the release agent are poured out with the mineral casting, a core being located in the interior of the jacket housing parts, which specifies the wall thickness of the lining element during the casting process. After the mineral casting has hardened or hardened, the shell housing parts are separated from one another, whereupon the core at least partially enclosed by the one-piece lining element can be destroyed and removed. Finally, the casing parts are put together again. This procedure has the advantage that the mineral cast lining of the spiral housing is in one piece. A mutual sealing of the lining elements of the respective housing parts is unnecessary. The disadvantage is However, the core, which determines the shape of the impeller chamber of the centrifugal pump, is enclosed in the mineral cast body after casting, so that the core must be destroyed and cannot 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 ausgekleide- ten 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 process steps is possible: First, at least two casing parts treated on the inner surface with the release agent are poured out individually with the mineral casting, the wall thickness of the lining elements being predetermined by a core during the casting process. After the mineral casting has hardened or hardened, the core is removed. Then the casing housing parts lined with the mineral casting are joined together, the sealing surfaces of the lining elements being sealed. In this way, the core can be used several times. Elastic seals are preferably used for the sealing.
Dadurch daß gemäß dem zuletzt beschriebenen Verfahren die Mantel- gehäuseteile 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 Spiral- gehäuseteile 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.Because the jacket housing parts are poured out individually in accordance with the method described last, there is advantageously the possibility of designing the casting mold formed by the jacket housing parts and the respective core in such a way that the lining elements protrude a few millimeters from the jacket housing parts in the region of the sealing surfaces. When the spiral housing parts produced according to the invention are assembled and screwed together, the sealing surfaces of the lining elements can be pressed against one another with great force. In addition, the lining elements are thus pressed firmly from the inside onto the casing housing parts, which ensures good power transmission from the pumping medium to the outer housing.
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. 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.Alternatively, the casting mold formed by the casing housing parts and the respective core can be designed such that the lining elements in the area of the sealing surfaces lie behind the screwed collars of the casing housing parts or are flush with them. In this case, only the forces caused by the elastic seals are transmitted to the lining elements, as a result of which a secure application of the mineral castings to the inner surfaces of the casing housing parts can also be ensured. According to the method described above, a centrifugal pump can be produced which has at least one impeller and at least one impeller chamber which receives the impeller and which is at least partially lined with lining elements made of mineral casting, the lining elements being enclosed by a metallic shell housing which consists of at least two shell housing parts which are encapsulated in the lining elements. The centrifugal pump according to the invention is characterized in that there is a gap filled with a separating agent between the outer surfaces of the lining elements and the inner surfaces of the casing housing parts.
Ausführungsbeispiele der Erfindung werden im folgenden anhand der Figuren erläutert. Es zeigen:Exemplary embodiments of the invention are explained below with reference to the figures. Show it:
Figur 1 schematische Darstellung der Herstellung eines Spiralgehäuses für eine Kreiselpumpe nach einer ersten Variante des er- findungsgemäßen Verfahrens;FIG. 1 shows a 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;
Figur 2 schematische Darstellung der Herstellung eines Spiralgehäuses für eine Kreiselpumpe nach einer zweiten Variante des erfindungsgemäßen Verfahrens;Figure 2 shows a schematic representation of the manufacture of a volute for a centrifugal pump according to a second variant of the method according to the invention;
Figur 3 Querschnittdarstellung eines Spiralgehäuses einer erfindungsgemäßen Kreiselpumpe;FIG. 3 shows a cross section of a volute casing of a centrifugal pump according to the invention;
Figur 4 Draufsicht auf das Spiralgehäuse gemäßFigure 4 top view of the spiral housing according to
Figur 3.Figure 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 Krei- seipumpen hat sich in der Praxis die Verwendung eines flüssigen Trennmittels auf Wachsbasis bewährt. Besonders geeignet ist beispielsweise das kommer- ziell 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 1b) 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 An- oder 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 verblie- bene 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 unterschiedli- ehe 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 Auskleidung- selemtentes 5 oder der Innenkontur der Mantelgehäuseteile 1 , 2 eine großflä- chige Kraftübertragung von dem Auskleidungselement 5 auf das durch die Mantelgehäuseteile 1 , 2 gebildete Außengehäuse gewährleistet ist.The manufacturing process shown schematically in FIG. 1 is based on two interconnected metallic shell housing parts 1 and 2 of a spiral housing of a centrifugal pump. The inner surfaces of the housing elements 1, 2 are pretreated with a release agent. FIG. 1 shows a separating agent layer 3 shown in dashed lines. In the production of spiral housings for circular pumps, the use of a liquid, wax-based separating agent has proven itself in practice. For example, the commercial The currently available "release agent T2" from Ebalta Kunststoff GmbH. As shown in FIG. 1, there is a core 4 inside the cavity formed by the connected casing housing parts 1, 2. FIG. 1a) shows the state of the casing casing parts connected by the casing 1, 2 and the mold 4 formed prior to the casting process, as shown in FIG. 1b), the space between the housing elements 1, 2 and the core 4 is filled with mineral casting after the casting process adapted lining element 5, the inner contour of which is predetermined by the core 4. After the mineral casting has hardened or hardened, the core 4 is destroyed and removed, Figure 1c) shows the final state of the manufacturing process enclosed cavity 6 back, which forms the impeller chamber of the centrifugal pump The release agent layer 3 remaining in the casing housing parts 1, 2 and the lining element 5 ensures that the lining element 5 is not firmly connected to the outer housing. Correspondingly, the lining element 5 cannot be destroyed by temperature differences between the casing housing parts 1, 2 and the lining element 5. The different thermal expansion caused by any temperature differences can be absorbed by a gap formed between the release agent layer 3 and the lining element 5 or by the release agent layer 3 itself. The manufacturing method described further ensures that without any reworking of the lining element 5 or the inner contour of the casing housing parts 1, 2, a large-area power transmission from the lining element 5 to the outer casing formed by the casing housing parts 1, 2 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 Mantel- gehäuseteile 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 manufacturing process shown schematically in FIG. 2, two separate casting molds are used, which consist of the upper casing part 1 and the lower casing part 2, respectively. The two shell housing parts 1, 2 are each covered by a plate 7 or 8, to which a part of the core 4 is fastened. Both jacket housing parts 1, 2 are pretreated on their inner surfaces with release agent. Figure 2a) shows the molds with the release agent layer 3 before the casting process. The two shell housing parts 1, 2 are poured out individually with mineral casting, again the wall thickness of the lining element 5 formed by the mineral cast body, as shown in FIG. 2b), is predetermined by the core 4. After the mineral casting has hardened or hardened, the core 4, which can be reused in the method shown in FIG. 2, and the plates 7, 8 are removed. The casing housing parts 1, 2 lined with mineral casting are in this state in FIG. 2c). The sealing surfaces of the lining elements 5 of the lower casing housing part 2 are sealed with elastic sealing elements 9, so that the upper casing housing part 1 can be put on. FIG. 2 shows the final state of the spiral housing consisting of the assembled casing housing parts 1, 2. The impeller chamber 6 is enclosed by two lining elements 5 which are sealed off from one another by means of the sealing elements 9 and which, owing to the separating agent layer 3, are not firmly connected to the metallic shell housing parts 1, 2.
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 Aus- kleidungselemente 5 formschlüssig in den Mantelgehäuseteilen 1 , 2 aufgenommen sind. Die Figur 4 zeigt ferner Verschraubungsbünde 10, 11 der Mantelge- häusteile 1 , 2 sowie einen Anschlußflansch 12 für den Auslaß der Kreiselpumpe.Figures 3 and 4 show a spiral housing of a centrifugal pump, which consists of two metallic outer shell housing parts 1 and 2. The impeller of the centrifugal pump, not shown in the figures, is received by the impeller chamber 6, which is partially lined with lining elements 5 made of mineral casting. Between the outer surfaces of the lining elements 5 and the inner surfaces of the casing housing parts 1, 2, the separating layer 3 shown in dashed lines can be seen in FIG. 3, which ensures that there is no firm connection between the casing housing parts 1, 2 and the lining elements 5. Sealing elements 9 are arranged between the sealing surfaces of the lining elements. At the same time, it can be seen in FIG. 3 that the lining elements 5 are accommodated in a form-fitting manner in the casing housing parts 1, 2. FIG. 4 also shows screw collars 10, 11 of the casing housing parts 1, 2 and a connecting flange 12 for the outlet of the centrifugal pump.
- Patentansprüche - - claims -

Claims

Patentansprüche claims
1. 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 (1 ,2) des Maschinenteils gegossen wird, so daß der Mineralguß nach der Aushärtung ein an die Innenkontur des Gehäuseelementes angepaßtes Auskleidungselement (5) bildet, d a d u r c h g e k e n n z e i c h n e t , d a ß die Innenflächen des Gehäuseelementes (1 ,2) vor dem Ausgießen mit einem Trennmittel (3) behandelt werden.1. A method for producing machine parts lined at least partially with mineral casting, the mineral casting in the liquid state being poured into at least one housing element (1, 2) of the machine part serving as part of a casting mold, so that the mineral casting, after hardening, is applied to the inner contour of the machine part Housing element adapted lining element (5), characterized in that ß the inner surfaces of the housing element (1, 2) are treated with a release agent (3) before pouring.
2. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß die Wandstärke des Auskleidungselementes (5) durch einen beim Gießvorgang in dem Gehäuseelement (1 ,2) befindlichen Kern (4) vorgegeben wird.2. The method according to claim 1, characterized in that the wall thickness of the lining element (5) by a during the casting process in the housing element (1, 2) located core (4) is predetermined.
3. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß als Mineralguß ein Gemisch aus einem Bindemittel mit Füllstoff verwendet wird, 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.3. The method according to claim 1, characterized in that a mixture of a binder with filler is used as the mineral casting, the filler being a fine-grained wear and corrosion-resistant material, such as in particular silicon carbide, quartz sand, glass, ceramic or a mixture from these materials.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß als Bindemittel ein unter Wärmezufuhr aushärtendes Kunstharz-Härtersystem verwendet wird. 4. The method according to claim 3, characterized in that a thermosetting synthetic resin curing system is used as the binder.
5. Verfahren nach Anspruch 1 , dadurch gekennzeichnet, daß das Gehäuseelement in den Mineralguß hineinragende Verankerungsmittel aufweist oder sonstwie formschlüssig mit dem Auskleidungselement verbunden ist.5. The method according to claim 1, characterized in that the housing element has in the mineral casting protruding anchoring means or is otherwise positively connected to the lining element.
6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß es sich bei dem Gehäuseelement um ein Mantelgehäuseteil eines Spiralgehäuses einer Kreiselpumpe handelt.6. The method according to any one of the preceding claims, characterized in that the housing element is a jacket housing part of a spiral housing of a centrifugal pump.
7. Verfahren nach Anspruch 6, gekennzeichnet durch die folgenden Verfahrensschritte: wenigstens zwei miteinander verbundene, an der Innenfläche mit dem Trennmittel (3) behandelte Mantelgehäuseteile (1 ,2) werden mit dem Mineralguß ausgegossen, wobei sich im Inneren der Mantelgehäuseteile ein Kern (4) befindet, welcher die Wandstärke des Auskleidungselementes (5) beim Gießvorgang vorgibt; nach dem An- oder Aushärten des Mineralgusses werden die Man- telgehäuseteile (1 ,2) voneinander getrennt; der von dem einteiligen Auskleidungselement (5) zumindest teilweise umschlossene Kern (4) wird zerstört und entfernt; die Mantellgehäuseteile (1 ,2) werden wieder zusammengefügt.7. The method according to claim 6, characterized by the following method steps: at least two interconnected, on the inner surface with the release agent (3) treated shell housing parts (1, 2) are poured out with the mineral casting, a core (4 ) is located, which specifies the wall thickness of the lining element (5) during the casting process; after the mineral casting has hardened or hardened, the shell housing parts (1, 2) are separated from one another; the core (4) at least partially enclosed by the one-piece lining element (5) is destroyed and removed; the shell housing parts (1, 2) are put together again.
8. Verfahren nach Anspruch 6, gekennzeichnet durch die folgenden Verfahrensschritte: wenigstens zwei an der Innenfläche mit dem Trennmittel (3) behandelte Mantelgehäuseteile (3) werden einzeln mit dem Mineralguß ausgegossen, wobei die Wandstärke der Auskleidungselemente (5) beim Gießvorgang jeweils durch einen Kern (4) vorgegeben wird; - nach dem An- oder Aushärten des Mineralgusses wird der Kern (4) entnommen; die mit dem Mineralguß ausgekleideten Mantelgehäuseteile (1 ,2) werden zusammengefügt, wobei die Dichtflächen der Auskleidungselemente (5) abgedichtet werden.8. The method according to claim 6, characterized by the following process steps: at least two on the inner surface with the release agent (3) treated shell housing parts (3) are poured out individually with the mineral casting, the wall thickness of the lining elements (5) during the casting process each by a core (4) is specified; - After the mineral casting has hardened or hardened, the core (4) is removed; the casing housing parts (1, 2) lined with the mineral casting are joined together, the sealing surfaces of the lining elements (5) being sealed.
9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß die durch die Mantelgehäuseteile (1 ,2) und den jeweiligen Kern (4) gebildete Gieß- form derart ausgebildet sind, daß die Auskleidungselemente (5) im Bereich der Dichtflächen einige Millimeter aus den Mantelgehäuseteilen (1,2) herausragen.9. The method according to claim 8, characterized in that by the shell housing parts (1, 2) and the respective core (4) formed casting are designed such that the lining elements (5) protrude a few millimeters from the casing housing parts (1, 2) in the area of the sealing surfaces.
10. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß die durch die Mantelgehäuseteile (1,2) und den jeweiligen Kern (4) gebildete Gieß- form derart ausgebildet sind, daß die Auskleidungselemente (5) im Bereich der Dichtflächen hinter den Verschraubungsbünden (10,11) der Mantelgehäuseteile (1,2) zurückliegen oder bündig abschließen.10. The method according to claim 8, characterized in that the casting mold formed by the casing housing parts (1, 2) and the respective core (4) are designed in such a way that the lining elements (5) in the region of the sealing surfaces behind the screwed collars (10 , 11) of the casing housing parts (1, 2) lie back or close flush.
11. Kreiselpumpe mit wenigstens einem Laufrad und wenigstens einer das Laufrad aufnehmenden Laufradkammer (6), die zumindest teilweise mit Auskleidungselementen (5) aus Mineralguß ausgekleidet ist, wobei die Auskleidungselemente (5) von einem metallischen Mantelgehäuse umschlossen sind, das aus wenigstens zwei Mantelgehäuseteilen (1,2) besteht, in welche die Auskleidungselemente (5) vergossen sind, d a d u r c h g e k e n n z e i c h n e t , d a ß zwischen den Außenflächen der Auskleidungselemente (5) und den Innenflächen der Mantelgehäuseteile (1,2) ein mit einem Trennmittel ausgefüllter Spalt (3) besteht.11. Centrifugal pump with at least one impeller and at least one impeller chamber (6) which receives the impeller and which is at least partially lined with lining elements (5) made of mineral casting, the lining elements (5) being enclosed by a metallic shell housing which consists of at least two shell housing parts ( 1,2), into which the lining elements (5) are cast, characterized in that there is a gap (3) filled with a separating agent between the outer surfaces of the lining elements (5) and the inner surfaces of the casing housing parts (1,2).
- Zusammenfassung - - Summary -
EP02779376A 2002-09-19 2002-09-19 Production of machine parts provided with a mineral casting Expired - Lifetime EP1511939B1 (en)

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
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
ATE452295T1 (en) * 2006-09-19 2010-01-15 Ihc Holland Ie Bv CENTRIFUGAL PUMP WITH INNER AND OUTER HOUSING
PE20150514A1 (en) * 2008-06-13 2015-05-07 Weir Minerals Australia Ltd SET OF ADJUSTMENT FOR A CASE OF A PUMP
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

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004033919A1 *

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ATE311539T1 (en) 2005-12-15
WO2004033919A1 (en) 2004-04-22
DE50205144D1 (en) 2006-01-05
AU2002342716A1 (en) 2004-05-04
US7329094B2 (en) 2008-02-12
US20050241793A1 (en) 2005-11-03
EP1511939B1 (en) 2005-11-30

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