Radial- Und Axialpumpen: Theorie, Entwurf, Anwendung
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zeigt dies deutlich; hier sind drei Kurven verschiedener Laufräder mit gleichem Durclimesser gezeichnet. Der Schnittpunkt der steilsten Kurve mit der Ordinate der Pumpe liegt am tiefsten, der der flachsten hat den höchsten Wert. Au erdem weisen Pumpen mit einem Maximum in der Charakteristik (sogenannte instabile Kennlinien) bei geschlossenem Schieber eine kleinere Förderhöhe auf als Pumpen mit einsinnig steigen- der Kennlinie, was mit den besonders hohen Verlusten dieser Pumpen- art bei sehr kleiner Förderung zu erklären ist. Dies sind die Gründe für die Streuung des Wertes Ku - 0 4. Die Förderhöhe bei geschlossenem Schieber wird durch die Form des Gehäuses beeinflu t. Das gleiche Laufrad in einer kleinen Spirale er- zeugt eine grö ere Höhe H als in einer grö eren. Ebenso ergibt ein 0 kleinerer Leitradwinkel eine grö ere Höhe bei Fördermenge null. Dem entspricht eine Verschiebung des Punktes besten Wirkungsgrades zu kleineren Fördermengen. In dem in Abb. 14. 19 dargestellten Beispiel ist das Gehäuse mit verstellbaren Schaufeln ausgerüstet. Die Förderhöhe des Laufrades ist selbstverständlich in allen Fällen gleich. Bei flacheren Leitradwinkeln wird lediglich ein grö erer Betrag an dynamischer Druckhöhe angezeigt. 6. Entwurf des Laufrades 6. 1. Problemstellung Die Auslegung des halbaxialen Rades ist die schwierigste zeichne- rische Aufgabe beim Pumpenentwurf. Zwei Methoden sind in Gebrauch. Bei der ersten, älteren Art werden Austritts- und Eintrittsende wie bei einer ebenen Schaufel auf dem die Deckfläche jeweils tangierenden Kegel konstruiert. Die Konstruktion wird in -die Draufsicht übertragen, aus dem die für den Modellbau benötigten Schaufelschnitte gewonnen werden.
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