EP0269903B1 - Inlet housing for flow machines - Google Patents
Inlet housing for flow machines Download PDFInfo
- Publication number
- EP0269903B1 EP0269903B1 EP87116286A EP87116286A EP0269903B1 EP 0269903 B1 EP0269903 B1 EP 0269903B1 EP 87116286 A EP87116286 A EP 87116286A EP 87116286 A EP87116286 A EP 87116286A EP 0269903 B1 EP0269903 B1 EP 0269903B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wall element
- inlet housing
- band
- opening
- connection port
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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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
- F04D29/4273—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps suction eyes
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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
- F04D29/44—Fluid-guiding means, e.g. diffusers
- F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
- F04D29/448—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps bladed diffusers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05B—INDEXING SCHEME RELATING TO WIND, SPRING, WEIGHT, INERTIA OR LIKE MOTORS, TO MACHINES OR ENGINES FOR LIQUIDS COVERED BY SUBCLASSES F03B, F03D AND F03G
- F05B2240/00—Components
- F05B2240/10—Stators
- F05B2240/12—Fluid guiding means, e.g. vanes
- F05B2240/121—Baffles or ribs
Definitions
- the invention relates to an inlet housing according to the preamble of the main claim.
- the fluid supplied to the turbomachine is deflected by approximately 90 °, in order then to flow into an impeller of a first stage through a suction opening penetrated by a shaft.
- a flow which is very uneven forms in the inlet cross section of the impeller and before the actual blading As a result, cavitation can occur in fluid-flow machines, which can damage or destroy the blade tips of the first impeller.
- a multi-stage centrifugal pump is known from DE-B-21 58 518, which shows different inlet housings in FIGS. 6 and 7.
- U-shaped or crescent-shaped wall surfaces are incorporated into the housing opposite the mouth of the connecting piece.
- Three or four bores branch off from the mouth of the connecting piece, which open directly into the annular space and thus bring about an inflow extending over almost the entire width of the annular space.
- swirls form within the annular space, which produce the known disadvantageous effects in the following impellers.
- the vortex arranged on the bottom of the U-shaped wall elements facing the shaft creates two vortex braids. Due to the flow, these are drawn into the impeller and cause cavitation damage there.
- the object of the invention is to develop an inlet housing for fluid-flow machines, to which the pumped medium flows almost radially to the shaft axis, which ensures a cavitation-reducing inflow for the downstream impeller with little complex production. This object is achieved in accordance with the characterizing part of the main claim.
- the band-shaped wall element can be, for example, a correspondingly dimensioned metal strip which can be given its shape in the simplest way, which ensures an optimal flow distribution between the mouth of the connecting piece and the inlet cross section of the downstream impeller within the inlet housing.
- An embodiment of the invention provides that the band-shaped wall element is connected to a housing wall of a first stage, that it forms the outer wall of the inlet housing and that an end plate which is tightly attached to the band-shaped wall element closes the inlet housing.
- the band-shaped wall element can simultaneously form the outer wall of the inlet housing.
- the connecting piece is then attached in the tapered part of the oval surface and a correspondingly designed end plate, which can be provided with bearings for the shaft, forms a tight seal for the inlet housing.
- a further embodiment of the invention provides that the ends of the band-shaped wall element arranged in the area of the connecting piece mouth enclose an angle which is open to the shaft and is equal to or greater than 10 °. This measure ensures that the medium emerging from the mouth of the connecting piece is supplied to the suction opening almost without turbulence.
- a further embodiment of the invention provides that the band-shaped wall element wrapping around the suction opening is provided with one or more radii of curvature, the center or centers of which are arranged concentrically or eccentrically to the shaft axis, with an eccentric center position there being an offset in the direction of the connecting piece. This measure allows good flow guidance in the area which is exactly opposite the junction of the connecting piece and is covered by the shaft.
- a further embodiment of the invention provides in this connection that the radius of curvature of the band-shaped wall element in the area of the suction opening is made 1.2 to 1.8 times larger than the radius of the suction opening. Experiments have shown that with such a ratio of the radii the most favorable inflow conditions and thus conditions preventing cavitation are present.
- the axial extent of the band-shaped wall element is designed to be equal to or larger than the mouth of the connecting piece.
- the oval-shaped surface enveloped by the wall element thus has a height which corresponds approximately to the diameter of the connecting piece. It is easily possible to expand the confluence of the connection piece in the direction of the shaft in a streamlined manner. In this way, detachments forming swirls are prevented in the area of the junction opening.
- the design according to the invention likewise requires simple manufacture, according to which the flow-guiding band-shaped wall element is arranged within an annular space surrounding the suction opening.
- the flow-guiding band-shaped wall element is arranged within an annular space surrounding the suction opening.
- Another measure which serves to optimize the inflow provides that the suction opening and / or the band-shaped wall element located in the region of the suction opening is provided with flow-guiding means.
- This can be flow-optimized shaped inlet rings which ensure a swirl-free deflection in the area of the wheel inlet.
- an open inlet housing (1) is shown using the example of a centrifugal pump, in the interior of which a wall element (2) is arranged. It is designed in the form of a band, its ends (3, 4) being arranged on both sides of the mouth (5) of the connecting piece (6) and completely wrapping around the suction opening (7) through which the medium to be conveyed flows to an impeller downstream of the inlet housing.
- the wall element (2) closes an oval-shaped one that becomes larger towards the suction opening (7) Area.
- a flow guide plate (8) arranged between the mouth (5) and the suction opening (7) ensures good flow guidance.
- the radius of curvature (R2) of the wall element is larger than the radius (R1) of the suction opening and in this example is arranged offset eccentrically in the direction of the connecting piece (6) relative to the center of the suction opening.
- the wall element (2) is arranged within an easily producible annular space (9) and by known means, e.g. Welding, screwing and the like, fixed within the same. Starting from the junction (5), the wall element (2) has an opening angle ( ⁇ ) which ensures a constant flow.
- the inlet housing (1) has a flange ring (10) which serves as an abutment for the screws holding the centrifugal pump together.
- Fig. 2 shows an assembled inlet housing (2) on a multi-stage centrifugal pump (11).
- a shaft (12) is passed through the inlet housing and supported in a bearing (13).
- the medium flowing in through the connecting piece (6) reaches the actual space with the oval-shaped base area, which is enveloped by the wall element (2).
- the direct arrangement of the ends of the wall element in the region of the junction (5) creates a safe flow.
- the flow follows the wall surfaces of the wall element and reaches the suction opening (7) with an impeller located behind it. As a result of the flow guidance avoiding turbulence, very good inflow conditions result for a downstream impeller.
- FIG. 3 an embodiment is shown using the example of a single-stage pump, in which the wall element (2) simultaneously represents a medium-tight outer wall of the Eirlaufgephaseuses.
- the wall element (2) enveloping the oval-shaped surface is welded to the pump housing and closed by a cover (14) having a corresponding outer contour.
Abstract
Description
Die Erfindung betrifft ein Einlaufgehäuse gemäß dem Oberbegriff des Hauptanspruches.The invention relates to an inlet housing according to the preamble of the main claim.
In derartigen Einlaufgehäusen wird das der Strömungsmaschine zugeführte Fluid um ungefähr 90° umgelenkt, um dann durch eine von einer Welle durchdrungene Ansaugöffnung in ein Laufrad einer ersten Stufe einzuströmen. Infolge der Strömungsumlenkung bildet sich in dem Eintrittsquerschnitt des Laufrades und vor der eigentlichen Beschaufelung eine Strömung aus, die sehr ungleichmäßig ist. Als Folge davon kann bei mit Flüssigkeiten beaufschlagten Strömungsmaschinen Kavitation auftreten, welche die Schaufelanfänge des ersten Laufrades beschädigen oder zerstören kann.In such inlet housings, the fluid supplied to the turbomachine is deflected by approximately 90 °, in order then to flow into an impeller of a first stage through a suction opening penetrated by a shaft. As a result of the flow deflection, a flow which is very uneven forms in the inlet cross section of the impeller and before the actual blading. As a result, cavitation can occur in fluid-flow machines, which can damage or destroy the blade tips of the first impeller.
Aus der DE-B-21 58 518 ist eine mehrstufige Kreiselpumpe bekannt, welche in den Fig. 6 und 7 verschiedene Einlaufgehäuse zeigt. In einen der Ansaugöffnung des jeweiligen Laufrades vorgeschalteten Ringraum sind gegenüber der Einmündung des Anschlußstutzens U-förmige oder halbmondförmige Wandflächen in das Gehäuse eingearbeitet. Von der Einmündung des Anschlußstutzens zweigen drei bzw. vier Bohrungen ab, welche direkt in den Ringraum einmünden und somit eine sich über nahezu die gesamte Breite des Ringraumes erstreckende Zuströmung bewirken. Infolge der vielen Zuströmöffnungen bilden sich innerhalb des Ringraumes Verwirbelungen aus, welche die bekannten nachteiligen Wirkungen in den folgenden Laufrädern erzeugen. Zusätzlich entstehen durch die am Boden der U-förmigen Wandelemente angeordnete, zur Welle weisende Rippe zwei Wirbelzöpfe. Aufgrund der Strömung werden diese in das Laufrad hineingezogen und verursachen dort Kavitationsschäden.A multi-stage centrifugal pump is known from DE-B-21 58 518, which shows different inlet housings in FIGS. 6 and 7. In an annular space upstream of the suction opening of the respective impeller, U-shaped or crescent-shaped wall surfaces are incorporated into the housing opposite the mouth of the connecting piece. Three or four bores branch off from the mouth of the connecting piece, which open directly into the annular space and thus bring about an inflow extending over almost the entire width of the annular space. As a result of the many inflow openings, swirls form within the annular space, which produce the known disadvantageous effects in the following impellers. In addition, the vortex arranged on the bottom of the U-shaped wall elements facing the shaft creates two vortex braids. Due to the flow, these are drawn into the impeller and cause cavitation damage there.
Der Erfindung liegt die Aufgabe zugrunde für Strömungsmaschinen, denen das Fördermedium nahezu radial zur Wellenachse zuströmt, ein Einlaufgehäuse zu entwickeln, welches bei wenig aufwendiger Herstellung für das nachgeordnete Laufrad eine Kavitation verringernde Zuströmung gewährleistet. Die Lösung dieser Aufgabe erfolgt gemäß dem kennzeichnenden Teil des Hauptanspruches.The object of the invention is to develop an inlet housing for fluid-flow machines, to which the pumped medium flows almost radially to the shaft axis, which ensures a cavitation-reducing inflow for the downstream impeller with little complex production. This object is achieved in accordance with the characterizing part of the main claim.
Bei dem bandförmigen Wandelement kann es sich beispielsweise um einen entsprechend dimensionierten Metallstreifen handeln, dem in einfachster Weise seine Form gegeben werden kann, welche innerhalb des Einlaufgehäuses eine optimale Strömungsverteilung zwischen der Einmündung des Anschlußstutzens und dem Eintrittsquerschnitt des nachgeordneten Laufrades sicherstellt.The band-shaped wall element can be, for example, a correspondingly dimensioned metal strip which can be given its shape in the simplest way, which ensures an optimal flow distribution between the mouth of the connecting piece and the inlet cross section of the downstream impeller within the inlet housing.
Eine Ausgestaltung der Erfindung sieht vor, daß das bandförmige Wandelement mit einer Gehäusewand einer ersten Stufe verbunden ist, daß es die Außenwand des Einlaufgehäuses bildet und daß eine am bandförmigen Wandelement dicht angebrachte Abschlußplatte das Einlaufgehäuse verschließt. Mittels dieser Maßnahme kann das bandförmige Wandelement gleichzeitig die Außenwand des Einlaufgehäuses bilden. Der Anschlußstutzen wird dann im sich verjüngenden Teil der ovalförmigen Fläche angebracht und eine entsprechend gestaltete Abschlußplatte, welche mit Lagerungen für die Welle versehen sein kann, bildet einen dichten Abschluß für das Einlaufgehäuse.An embodiment of the invention provides that the band-shaped wall element is connected to a housing wall of a first stage, that it forms the outer wall of the inlet housing and that an end plate which is tightly attached to the band-shaped wall element closes the inlet housing. By means of this measure, the band-shaped wall element can simultaneously form the outer wall of the inlet housing. The connecting piece is then attached in the tapered part of the oval surface and a correspondingly designed end plate, which can be provided with bearings for the shaft, forms a tight seal for the inlet housing.
Eine weitere Ausgestaltung der Erfindung sieht vor, daß die im Bereich der Anschlußstutzen-Einmündung angeordneten Enden des bandförmigen Wandelementes einen zur Welle hin offenen Winkel einschließen, der gleich oder größer 10° ist. Mittels dieser Maßnahme wird sichergestellt, daß das aus der Einmündung des Anschlußstutzens austretende Medium nahezu verwirbelungsfrei der Ansaugöffnung zugeführt wird.A further embodiment of the invention provides that the ends of the band-shaped wall element arranged in the area of the connecting piece mouth enclose an angle which is open to the shaft and is equal to or greater than 10 °. This measure ensures that the medium emerging from the mouth of the connecting piece is supplied to the suction opening almost without turbulence.
Eine weitere Ausgestaltung der Erfindung sieht vor, daß das die Ansaugöffnung umschlingende bandförmige Wandelement mit einem oder mehreren Krümmungsradien versehen ist, dessen oder deren Mittelpunkte konzentrisch oder exzentrisch zur Wellenachse angeordnet sind, wobei bei exzentrischer Mittelpunktslage ein Versatz in Richtung Anschlußstutzen besteht. Diese Maßnahme erlaubt eine gute Strömungsführung in demjenigen Bereich, der der Einmündung des Anschlußstutzens genau gegenüberliegt und durch die Welle abgedeckt ist. Eine weitere Ausgestaltung der Erfindung sieht in diesem Zusammenhang vor, daß der Krümmungsradius des bandförmigen Wandelementes im Bereich der Ansaugöffnung 1,2 bis 1,8 mal größer als der Radius der Ansaugöffnung ausgebildet ist. Versuche haben ergeben, daß bei einem derartigen Verhältnis der Radien die günstigsten Zuströmbedingungen und damit Kavitation verhindernde Verhältnisse vorhanden sind.A further embodiment of the invention provides that the band-shaped wall element wrapping around the suction opening is provided with one or more radii of curvature, the center or centers of which are arranged concentrically or eccentrically to the shaft axis, with an eccentric center position there being an offset in the direction of the connecting piece. This measure allows good flow guidance in the area which is exactly opposite the junction of the connecting piece and is covered by the shaft. A further embodiment of the invention provides in this connection that the radius of curvature of the band-shaped wall element in the area of the suction opening is made 1.2 to 1.8 times larger than the radius of the suction opening. Experiments have shown that with such a ratio of the radii the most favorable inflow conditions and thus conditions preventing cavitation are present.
Nach einer anderen Ausgestaltung der Erfindung ist die axiale Erstreckung des bandförmigen Wandelementes gleich oder größer als die Einmündung des Anschlußstutzens ausgebildet. Die von dem Wandelement eingehüllte ovalförmige Fläche weist damit eine Höhe auf, die in etwa dem Durchmesser des Anschlußstutzens entspricht. Es ist ohne weiteres möglich, die Einmündung des Anschlußstutzens in Richtung auf die Welle strömungsgünstig zu erweitern. Somit werden Verwirbelungen bildende Ablösungen im Bereich der Anschlußstutzen-Einmündung verhindert.According to another embodiment of the invention, the axial extent of the band-shaped wall element is designed to be equal to or larger than the mouth of the connecting piece. The oval-shaped surface enveloped by the wall element thus has a height which corresponds approximately to the diameter of the connecting piece. It is easily possible to expand the confluence of the connection piece in the direction of the shaft in a streamlined manner. In this way, detachments forming swirls are prevented in the area of the junction opening.
Eine Verbesserung der Strömungsführung wird mit einer weiteren Ausgestaltung der Erfindung erreicht, wonach innerhalb der ovalförmigen Fläche ein oder mehrere Strömungsleitbleche zwischen der Einmündung des Anschlußstutzens und der Ansaugöffnung angeordnet sind. Bei großen zuströmenden Mengen kann somit eine weitere Optimierung der Strömungsverhältnisse erlangt werden.An improvement of the flow guidance is achieved with a further embodiment of the invention, according to which one or more flow baffles are arranged within the oval surface between the mouth of the connecting piece and the suction opening. With large inflowing quantities, a further optimization of the flow conditions can thus be achieved.
Ebenfalls eine einfache Herstellung bedingt die erfindungsgemäße Ausgestaltung, wonach innerhalb eines die Ansaugöffnung umgebenden Ringraumes das strömungsführende bandförmige Wandelement angeordnet ist. Durch einfaches Formen des bandförmigen Wandelementes und entsprechende Befestigung innerhalb eines Ringraumes, beispielsweise durch Schweißen, kann mit einfachsten Mitteln eine optimale Strömungsführung bewirkt werden.The design according to the invention likewise requires simple manufacture, according to which the flow-guiding band-shaped wall element is arranged within an annular space surrounding the suction opening. By simple shaping of the band-shaped wall element and appropriate fastening within an annular space, for example by welding, optimal flow guidance can be achieved with the simplest of means.
Eine weitere, der Optimierung der Zuströmung dienende Maßnahme sieht vor, daß die Ansaugöffnung und/oder das im Bereich der Ansaugöffnung befindliche bandförmige Wandelement mit strömungsführenden Mitteln versehen ist. Hierbei kann es sich um strömungsgünstig geformte Einlaufringe handeln, die eine verwirbelungsfreie Umlenkung im Bereich des Radeinlaufes gewährleisten.Another measure which serves to optimize the inflow provides that the suction opening and / or the band-shaped wall element located in the region of the suction opening is provided with flow-guiding means. This can be flow-optimized shaped inlet rings which ensure a swirl-free deflection in the area of the wheel inlet.
Ausführungsbeispiele der Erfindung sind in den Zeichnungen dargestellt und werden im folgenden näher beschrieben. Es zeigen die
- Fig. 1
- eine Vorderansicht eines offenen Einlaufgehäuses, die
- Fig. 2
- einen Schnitt durch eine mehrstufige Strömungsmaschine und die
- Fig. 3
- ein angeschweißtes Einlaufgehäuse.
- Fig. 1
- a front view of an open inlet housing, the
- Fig. 2
- a section through a multi-stage fluid machine and the
- Fig. 3
- a welded inlet housing.
In der Fig. 1 ist am Beispiel einer Kreiselpumpe ein geöffnetes Einlaufgehäuse (1) gezeigt, in dessen Innern ein Wandelement (2) angeordnet ist. Es ist bandförmig ausgebildet, wobei seine Enden (3, 4) beiderseits der Einmündung (5) des Anschlußstutzens (6) angeordnet sind und die Ansaugöffnung (7) vollständig umschlingen, durch die das zu fördernde Medium einem dem Einlaufgehäuse nachgeordneten Laufrad zuströmt. Das Wandelement (2) schließt dabei eine zur Ansaugöffnung (7) hin größer werdende ovalförmige Fläche ein. Ein zwischen der Einmündung (5) und der Ansaugöffnung (7) angeordnetes Strömungsleitblech (8) gewährleistet eine gute Strömungsführung. Der Krümmungsradius (R2) des Wandelementes ist größer als der Radius (R1) der Ansaugöffnung und ist in diesem Beispiel gegenüber dem Mittelpunkt der Ansaugöffnung exzentrisch in Richtung Anschlußstutzen (6) versetzt angeordnet. Es ist aber auch möglich, für die Radien einen gemeinsamen Mittelpunkt vorzusehen.In Fig. 1, an open inlet housing (1) is shown using the example of a centrifugal pump, in the interior of which a wall element (2) is arranged. It is designed in the form of a band, its ends (3, 4) being arranged on both sides of the mouth (5) of the connecting piece (6) and completely wrapping around the suction opening (7) through which the medium to be conveyed flows to an impeller downstream of the inlet housing. The wall element (2) closes an oval-shaped one that becomes larger towards the suction opening (7) Area. A flow guide plate (8) arranged between the mouth (5) and the suction opening (7) ensures good flow guidance. The radius of curvature (R2) of the wall element is larger than the radius (R1) of the suction opening and in this example is arranged offset eccentrically in the direction of the connecting piece (6) relative to the center of the suction opening. However, it is also possible to provide a common center point for the radii.
Das Wandelement (2) ist innerhalb eines einfach herstellbaren Ringraumes (9) angeordnet und durch bekannte Mittel, z.B. Schweißen, Schrauben und dergleichen, innerhalb desselben befestigt. Ausgehend von der Einmündung (5) weist das Wandelement (2) einen Öffnungswinkel (α) auf, welcher eine stetige Strömungsführung gewährleistet. Das Einlaufgehäuse (1) weist hier einen Flanschring (10) auf, der als Widerlager für die Kreiselpumpe zusammenhaltende Schrauben dient.The wall element (2) is arranged within an easily producible annular space (9) and by known means, e.g. Welding, screwing and the like, fixed within the same. Starting from the junction (5), the wall element (2) has an opening angle (α) which ensures a constant flow. The inlet housing (1) has a flange ring (10) which serves as an abutment for the screws holding the centrifugal pump together.
Die Fig. 2 zeigt ein montiertes Einlaufgehäuse (2) an einer mehrstufigen Kreiselpumpe (11). Eine Welle (12) ist durch das Einlaufgehäuse hindurchgeführt und in einem Lager (13) abgestützt. Das durch den Anschlußstutzen (6) einströmende Medium gelangt nach Passieren der Einmündung in den eigentlichen von dem Wandelement (2) umhüllten Raum mit der ovalförmigen Grundfläche. Durch die direkte Anordnung der Enden des Wandelementes im Bereich der Einmündung (5) wird eine sichere Strömungsführung erzeugt. Die Strömung folgt den Wandflächen des Wandelementes und gelangt in die Ansaugöffnung (7) mit einem dahinter befindlichen Laufrad. Infolge der Verwirbelungen vermeidenden Strömungsführung ergeben sich für ein nachgeordnetes Laufrad sehr gute Anströmverhältnisse.Fig. 2 shows an assembled inlet housing (2) on a multi-stage centrifugal pump (11). A shaft (12) is passed through the inlet housing and supported in a bearing (13). The medium flowing in through the connecting piece (6) reaches the actual space with the oval-shaped base area, which is enveloped by the wall element (2). The direct arrangement of the ends of the wall element in the region of the junction (5) creates a safe flow. The flow follows the wall surfaces of the wall element and reaches the suction opening (7) with an impeller located behind it. As a result of the flow guidance avoiding turbulence, very good inflow conditions result for a downstream impeller.
In der Fig. 3 ist am Beispiel einer einstufigen Pumpe eine Ausführungsform gezeigt, bei der das Wandelement (2) gleichzeitig eine mediumdichte Außenwand des Eirlaufgehäuses darstellt. Hierzu ist das die ovalförmige Fläche umhüllende Wandelement (2) mit dem Pumpengehäuse verschweißt und durch einen, eine entsprechende Außenkontur aufweisenden Deckel (14), verschlossen.In Fig. 3, an embodiment is shown using the example of a single-stage pump, in which the wall element (2) simultaneously represents a medium-tight outer wall of the Eirlaufgehäuses. For this purpose, the wall element (2) enveloping the oval-shaped surface is welded to the pump housing and closed by a cover (14) having a corresponding outer contour.
Claims (9)
- An inlet housing for fluid flow machines with one or more stages, in the case of which the input flow takes place through a connection port arranged radially in relation to the shaft and the connection port opens into a space which surrounds the shaft and has a wall surface guiding the flow, and in the space an arcuate wall element is arranged which is designed to be open towards the connection port and covers the shaft and an aspiration opening surrounding the shaft, characterized in that:- the wall element (2) is designed in the form of a band and includes an oval surface,- the ends (3 and 4) of the wall element (2) are arranged on the two sides of the opening (5) of the connection port (6) and- the part, which has the greater radius, of the band-like wall element (2), is arranged around and adjacent to the aspiration opening (7).
- The inlet housing as claimed in claim 1, characterized in that the band-like wall element (2) is connected with a housing wall of a first stage, in that it constitutes the outer wall of the inlet housing and in that a connection plate (14), which is sealingly arranged on the band-like wall element (2), shuts off the inlet housing.
- The inlet housing as claimed in claim 1 or in claim 2, characterized in that the ends (3 and 4), which are arranged adjacent to the connection port opening (5), of the band-like wall element (2) include between them an angle (α) opening towards the shaft (12) and which is equal to or greater than 10°.
- The inlet housing as claimed in any one of the preceding claims 1 through 3, characterized in that the band-like wall element (2) surrounding the aspiration opening (7) has one or more radiuses of curvature (R2), whose center or, respectively, centers lie on or do not lie on the shaft axis by the curvature being eccentric thereto and in the case of an eccentric positioning there is an offset towards the connection port (6).
- The inlet housing as claimed in any one of the preceding claims 1 through 4, characterized in that the radius of curvature (R2) of the band-like wall element (2) adjacent to the aspiration opening (7) is 1.2 to 1.8 times larger than the radius (R1) of the aspiration opening.
- The inlet housing as claimed in any one of the preceding claims 1 through 5, characterized in that the axial extent of the band-like wall element (2) is equal to or larger than the opening (5) of the connection port (6).
- The inlet housing as claimed in any one of the preceding claims 1 through 6, characterized in that one or more flow guiding sheet metal parts (8) are arranged between the opening (5) of the connection port (6) and the aspiration opening (7) within the oval surface.
- The inlet housing as claimed in any one of the preceding claims 1 through 7, characterized in that the flow guiding wall element (2) is arranged within an annular space (9) around the aspiration opening (7).
- The inlet housing as claimed in any one of the preceding claims 1 through 8, characterized in that the aspiration opening (7) and/or the band-like wall element (2), which is arranged adjacent to the aspiration opening (7), is provided with flow guide means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT87116286T ATE72305T1 (en) | 1986-11-29 | 1987-11-05 | INLET HOUSING FOR TURBO MACHINES. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3640894 | 1986-11-29 | ||
| DE3640894A DE3640894C2 (en) | 1986-11-29 | 1986-11-29 | Inlet housing for centrifugal pump |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0269903A2 EP0269903A2 (en) | 1988-06-08 |
| EP0269903A3 EP0269903A3 (en) | 1989-07-26 |
| EP0269903B1 true EP0269903B1 (en) | 1992-01-29 |
Family
ID=6315134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP87116286A Expired - Lifetime EP0269903B1 (en) | 1986-11-29 | 1987-11-05 | Inlet housing for flow machines |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4799857A (en) |
| EP (1) | EP0269903B1 (en) |
| AT (1) | ATE72305T1 (en) |
| DE (1) | DE3640894C2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1991015664A1 (en) * | 1990-03-30 | 1991-10-17 | Airflow Research And Manufacturing Corporation | Space-efficient centrifugal blower |
| US5125806A (en) * | 1990-06-18 | 1992-06-30 | Sundstrand Corporation | Integrated variable speed compressor drive system |
| US5297930A (en) * | 1991-12-31 | 1994-03-29 | Cornell Research Foundation, Inc. | Rotating stall suppression |
| DE4222391C2 (en) * | 1992-07-08 | 1995-04-20 | Gutehoffnungshuette Man | Cylindrical combustion chamber housing of a gas turbine |
| DE4328186C2 (en) * | 1992-10-26 | 2002-05-16 | Alstom | Flow divider for radial-axial inlet housing |
| DE4326800A1 (en) * | 1993-08-10 | 1995-02-16 | Abb Management Ag | Device for setting a stable compressor admission flow from the inlet box in gas turbine plants |
| CN102444617A (en) * | 2010-09-30 | 2012-05-09 | 上海凯士比泵有限公司 | Water suction chamber of multistage centrifugal pump |
| CN102454637A (en) * | 2010-10-20 | 2012-05-16 | 李正奇 | Water inlet section for high-temperature and high-pressure centrifugal pump |
| DE102011116904A1 (en) * | 2011-10-25 | 2013-04-25 | Wilo Se | Multi-stage centrifugal pump |
Family Cites Families (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE178666C (en) * | ||||
| DE664629C (en) * | 1938-08-31 | Karl Loebler | Centrifugal pump | |
| DE15855C (en) * | B. VERITV und W. VERITY in London | Innovations to fans | ||
| US2018827A (en) * | 1933-04-15 | 1935-10-29 | Allis Chalmers Mfg Co | Rotary blower casing |
| US2542902A (en) * | 1946-01-31 | 1951-02-20 | Ford Motor Co | Water pump |
| CH313025A (en) * | 1951-09-13 | 1956-03-15 | Andritz Ag Maschf | Centrifugal pump housing |
| GB1013341A (en) * | 1961-02-02 | 1965-12-15 | Tetmark Patents Ltd | Improvements in volute pumps, turbines and the like |
| DE1503270A1 (en) * | 1965-06-24 | 1970-07-16 | Fischachtaler Maschb Gmbh | Inlet housing for flow machines |
| US3485442A (en) * | 1965-09-13 | 1969-12-23 | Caterpillar Tractor Co | Gas turbine engines |
| DE1528883A1 (en) * | 1966-07-15 | 1971-06-03 | Voith Gmbh J M | Suction elbow for centrifugal pumps |
| DE1628193A1 (en) * | 1966-12-15 | 1970-04-30 | Bahco Ab | Suction housing for radial fan |
| GB1184972A (en) * | 1968-01-02 | 1970-03-18 | Pegg S & Son Ltd | Reversible Impeller Pump |
| DE1653786B2 (en) * | 1968-02-15 | 1972-03-02 | J M Voith GmbH, 7920 Heidenheim | SUCTION MANIFOLD FOR CENTRIFUGAL PUMPS |
| CA957563A (en) * | 1970-12-21 | 1974-11-12 | Carl J. Blom | Multistage pump and manufacturing method |
| US3859008A (en) * | 1971-07-06 | 1975-01-07 | Andritz Ag Maschf | Pump with offset inflow and discharge chambers |
| DE2633480B2 (en) * | 1976-07-26 | 1979-04-05 | Aktiengesellschaft Kuehnle, Kopp & Kausch, 6710 Frankenthal | Pre-control device for a fan with a large impeller diameter |
| DE2707860A1 (en) * | 1977-02-24 | 1978-08-31 | Maschf Augsburg Nuernberg Ag | FLOW MACHINE FOR GAS MEDIA WITH A HEAT EXCHANGER |
| GB2008676A (en) * | 1977-11-29 | 1979-06-06 | Wallace Murray Corp | Radial Inlet Housing for a Centrifugal Compressor. |
| DE2933904C2 (en) * | 1979-08-22 | 1985-03-14 | Klein, Schanzlin & Becker Ag, 6710 Frankenthal | Inlet elbow |
| DE3011888A1 (en) * | 1980-03-27 | 1981-10-01 | Richard 7066 Baltmannsweiler Halm | In line mounting centrifugal pump - has insert in casing with suction channel coupled to suction opening and to impeller |
| US4466780A (en) * | 1981-01-28 | 1984-08-21 | Elco International, Ltd. | Portable air pump apparatus |
| JPH0643840B2 (en) * | 1985-10-04 | 1994-06-08 | 株式会社日立製作所 | Pre-swivel type pump suction passage |
-
1986
- 1986-11-29 DE DE3640894A patent/DE3640894C2/en not_active Expired - Lifetime
-
1987
- 1987-11-05 AT AT87116286T patent/ATE72305T1/en not_active IP Right Cessation
- 1987-11-05 EP EP87116286A patent/EP0269903B1/en not_active Expired - Lifetime
- 1987-11-20 US US07/123,380 patent/US4799857A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE3640894C2 (en) | 1997-05-28 |
| DE3640894A1 (en) | 1988-06-09 |
| EP0269903A3 (en) | 1989-07-26 |
| ATE72305T1 (en) | 1992-02-15 |
| US4799857A (en) | 1989-01-24 |
| EP0269903A2 (en) | 1988-06-08 |
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