EP0953772B1 - Centrifugal pump with bleed screw - Google Patents
Centrifugal pump with bleed screw Download PDFInfo
- Publication number
- EP0953772B1 EP0953772B1 EP99108733A EP99108733A EP0953772B1 EP 0953772 B1 EP0953772 B1 EP 0953772B1 EP 99108733 A EP99108733 A EP 99108733A EP 99108733 A EP99108733 A EP 99108733A EP 0953772 B1 EP0953772 B1 EP 0953772B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- centrifugal pump
- motor
- bleed screw
- driven centrifugal
- pump according
- 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
Links
- 238000001816 cooling Methods 0.000 claims description 3
- 238000005086 pumping Methods 0.000 claims 2
- 230000000740 bleeding effect Effects 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 238000013022 venting Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
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
- F04D9/00—Priming; Preventing vapour lock
- F04D9/001—Preventing vapour lock
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
- F04D13/0626—Details of the can
Definitions
- the invention relates to a centrifugal pump with a Canned tube through which the medium is flowing for cooling is, through a shaft bore the fluid in the pump suction chamber flows back and to vent the A vent screw at the bottom of the can Canned tube is arranged.
- Centrifugal motor pumps are known, see e.g. FR-A-1 399 292, whose canned space is vented by means of a bleed screw, which on Bottom of the can is screwed in. After opening one the vent screw emerges from inside the A water / air mixture.
- a bleed screw After opening one the vent screw emerges from inside the A water / air mixture.
- leakage of water does not mean that the pump is complete is vented because when the pump is vented in Suction chamber already has water and air only through the small gap between the shaft and the radial bearing can escape. This allows water to flow through faster the shaft bore in the upper area of the containment shell and the vent screw enters Water / air mixture out, although the pump chamber is not is completely flooded. This is particularly serious if a pump has several hydraulic levels.
- the object of the invention is a pump of the beginning to improve the type mentioned so that it can be clearly identified is whether the hydraulic range of the pump is sufficient is filled with water and that a complete Venting of the pump is guaranteed.
- vent screw in the open state directly or closes the shaft bore via an intermediate part.
- the Vent screw at its inner end a head has in the closed state with a conical rear ring surface on a conical seat of the bore in which the Vent screw is screwed in. It is also sealing with 0-ring or flat gasket possible.
- the head of the Vent screw with its front on the Rest the shaft end.
- vent screw in a threaded insert lies in the bottom of the Can is attached.
- a simple push of the Bleed screw is reached when the Vent screw on the outside of it Actuation of a polygonal one Hexagon pocket hole has.
- the shaft be vertical stands.
- the centrifugal motor pump can also have several Have pump stages.
- FIGS. 1 and 2 only the end region 1 is smaller Diameter of the can 2 shown.
- the bearing 3 in which the end of the motor shaft 4 is supported.
- the wave 4 has a coaxial shaft bore 5 through which The inside of the canned pipe for cooling flowing water Pump room can flow back.
- the inside of the canned pipe for cooling flowing water Pump room can flow back.
- the pump builds up water from the Pressure side of the pump through the rotor space and thus through the inside of the can and through a gap between Shaft and radial bearing in the top area of the can and then through the shaft bore 5 back into the not illustrated suction chamber of the impeller that on the other End of the shaft 4 is attached.
- the cup-shaped end region 1 of the can 2 has a coaxial opening 6 with a socket-shaped extension, in attached to a threaded insert 7, in particular is welded or soldered.
- the cross section T-shaped thread insert 7 has a coaxial Threaded bore 8 in which a vent screw 9 is screwed in. Above the bleed screw 9 is the front outer wall of the Motor housing.
- vent screw 9 At the inner end of the vent screw 9 is a head 11 molded on, which forms a conical annular surface 12, the with the vent screw closed on a Taper seat 13 of the threaded insert 7 rests. Will the Vent screw 9 down to the open position screwed, the screw 9 moves in the direction of Face 14 of the shaft 4 and closes the Opening or mouth 15 of the shaft bore 5, as in Fig. 2 shown. As a result, water can no longer come out of the Shaft bore 5 emerge and only air occurs next to the Vent screw 9 upwards.
- the Bleed screw 9 also directly in opening 6 be screwed, especially if the opening 6 a has a smaller diameter. Furthermore, the Vent screw 9 a key surface laterally exhibit.
- the centrifugal motor pump is preferably installed so that the shaft or axis is vertical, the Bleed screw 9 is on top. Preferably owns the pump has several pump stages. Finally, between the head 11 and the upper end of the shaft 4 Be arranged intermediate part, in particular on the head 11th is attached to represent an extension or to achieve greater tightness.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
Die Erfindung betrifft eine Kreiselmotorpumpe mit einem Spaltrohr, das zur Kühlung vom Fördermedium durchflossen ist, wobei durch eine Wellenbohrung das Fördermedium in den Pumpensaugraum zurückfließt und zum Entlüften des Spaltrohrraumes eine Entlüftungsschraube am Boden des Spaltrohres angeordnet ist.The invention relates to a centrifugal pump with a Canned tube through which the medium is flowing for cooling is, through a shaft bore the fluid in the pump suction chamber flows back and to vent the A vent screw at the bottom of the can Canned tube is arranged.
Es sind Kreiselmotorpumpen bekannt, siehe z.B. FR-A-1 399 292, deren Spaltrohrraum durch eine Entlüftungsschraube entlüftet wird, die am Boden des Spaltrohres eingeschraubt ist. Nach einem öffnen der Entlüftungsschraube tritt aus dem Inneren des Spalttopfes ein Wasser/Luft-Gemisch aus. Hierbei bedeutet ein Austreten von Wasser nicht, daß die Pumpe vollständig entlüftet ist, da bei einer Entlüftung der Pumpe im Saugraum bereits Wasser vorhanden ist und die Luft nur durch den kleinen Spalt zwischen Welle und Radiallager entweichen kann. Hierdurch kann Wasser schneller durch die Wellenbohrung in den oberen Bereich des Spalttopfes gelangen und an der Entlüftungsschraube tritt ein Wasser/Luft-Gemisch aus, obwohl die Pumpenkammer nicht vollständig geflutet ist. Besonders gravierend ist dies, wenn eine Pumpe mehrere Hydraulikstufen aufweist.Centrifugal motor pumps are known, see e.g. FR-A-1 399 292, whose canned space is vented by means of a bleed screw, which on Bottom of the can is screwed in. After opening one the vent screw emerges from inside the A water / air mixture. Here means leakage of water does not mean that the pump is complete is vented because when the pump is vented in Suction chamber already has water and air only through the small gap between the shaft and the radial bearing can escape. This allows water to flow through faster the shaft bore in the upper area of the containment shell and the vent screw enters Water / air mixture out, although the pump chamber is not is completely flooded. This is particularly serious if a pump has several hydraulic levels.
Aufgabe der Erfindung ist es, eine Pumpe der eingangs genannten Art so zu verbessern, daß eindeutig zu erkennen ist, ob der hydraulische Bereich der Pumpe ausreichend mit Wasser gefüllt ist, und daß eine vollständige Entlüftung der Pumpe gewährleistet wird.The object of the invention is a pump of the beginning to improve the type mentioned so that it can be clearly identified is whether the hydraulic range of the pump is sufficient is filled with water and that a complete Venting of the pump is guaranteed.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Entlüftungsschraube im geöffneten Zustand direkt oder über ein Zwischenteil die Wellenbohrung verschließt.This object is achieved in that the vent screw in the open state directly or closes the shaft bore via an intermediate part.
Durch eine solche Konstruktion wird bei einem Öffnen der Entlüftungsschraube einerseits der Spalttopf nach außen geöffnet und andererseits gleichzeitig die Wellenbohrung der Pumpe verschlossen. Hierdurch wird gewährleistet, daß zunächst die Luft vollständig aus der Hydraulik entweichen kann. Ein Wasseraustritt an der Entlüftungsschraube signalisiert dann eindeutig die vollständige Entlüftung der Pumpe, so daß das Entlüften einer Pumpe, insbesondere einer mehrstufigen Pumpe, zu einer einfachen und sicheren Arbeit wird.With such a construction, when opening the Vent screw on the one hand the canister to the outside open and at the same time the shaft bore the pump is closed. This ensures that First of all, the air completely from the hydraulics can escape. A water leak on the Vent screw then clearly signals the complete venting of the pump so that the venting a pump, especially a multi-stage pump a simple and safe job.
Vorzugsweise wird vorgeschlagen, daß die Entlüftungsschraube an ihrem inneren Ende einen Kopf aufweist, der im geschlossenen Zustand mit einer kegelförmigen rückseitigen Ringfläche auf einer kegelförmigen Sitzfläche der Bohrung anliegt, in die die Entlüftungsschraube eingeschraubt ist. Es ist aber auch eine Abdichtung über 0-Ring oder Flachdichtung möglich. Hierbei kann im geöffneten Zustand der Kopf der Entlüftungsschraube mit seiner Vorderseite auf dem Wellenende aufliegen.It is preferably proposed that the Vent screw at its inner end a head has in the closed state with a conical rear ring surface on a conical seat of the bore in which the Vent screw is screwed in. It is also sealing with 0-ring or flat gasket possible. Here, the head of the Vent screw with its front on the Rest the shaft end.
Auch ist von Vorteil, wenn die Entlüftungsschraube in einem Gewindeeinsatz einliegt, das im Boden des Spalttopfes befestigt ist. Eine einfache Betätigung der Entlüftungsschraube wird erreicht, wenn die Entlüftungsschraube an ihrer Außenseite zu ihrer Betätigung eine Mehrkant- insbesondere eine Sechskantsackbohrung aufweist.It is also advantageous if the vent screw in a threaded insert lies in the bottom of the Can is attached. A simple push of the Bleed screw is reached when the Vent screw on the outside of it Actuation of a polygonal one Hexagon pocket hole has.
Vorzugsweise wird vorgeschlagen, daß die Welle senkrecht steht. Auch kann die Kreiselmotorpumpe mehrere Pumpenstufen aufweisen.It is preferably proposed that the shaft be vertical stands. The centrifugal motor pump can also have several Have pump stages.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung in axialen Schnitten im Ausschnitt dargestellt und wird im folgenden näher beschrieben. Es zeigen
- Fig. 1
- die Entlüftungsschraube im geschlossenen Zustand und
- Fig. 2
- die Entlüftungsschraube im geöffneten Zustand, wobei sie die Wellenbohrung verschließt.
- Fig. 1
- the vent screw when closed and
- Fig. 2
- the vent screw in the open state, closing the shaft bore.
In Fig. 1 und Fig. 2 ist nur der Endbereich 1 kleineren
Durchmessers des Spaltrohres 2 dargestellt. Im
zylindrischen Endbereich 1 liegt das Lager 3 ein, in dem
das Ende der Motorenwelle 4 gelagert ist. Die Welle 4
besitzt eine koaxiale Wellenbohrung 5, die durch das
Spaltrohrinnere zur Kühlung fließendes Wasser zum
Pumpenraum zurückströmen läßt. Hierbei fließt durch die
Druckdifferenz, die die Pumpe aufbaut, Wasser von der
Druckseite der Pumpe durch den Rotorraum und damit durch
das Innere des Spaltrohres und durch einen Spalt zwischen
Welle und Radiallager im obersten Bereich des Spaltrohres
und dann durch die Wellenbohrung 5 zurück in den nicht
dargestellten Saugraum des Laufrades, das auf dem anderen
Ende der Welle 4 befestigt ist.In FIGS. 1 and 2, only the end region 1 is smaller
Diameter of the
Der topfförmige Endbereich 1 des Spaltrohres 2 besitzt
eine koaxiale Öffnung 6 mit buchsenförmigem Ansatz, in
dem ein Gewindeeinsatz 7 befestigt, insbesondere
eingeschweißt oder eingelötet ist. Der im Querschnitt
T-förmige Gewindeeinsatz 7 weist eine koaxiale
Gewindebohrung 8 auf, in der eine Entlüftungsschraube 9
eingeschraubt ist. Oberhalb der Entlüftungsschraube 9
befindet sich die stirnseitige Außenwand des
Motorengehäuses.The cup-shaped end region 1 of the
Am inneren Ende der Entlüftungsschraube 9 ist ein Kopf 11
angeformt, der eine kegelförmige Ringfläche 12 bildet,
die bei geschlossener Entlüftungsschraube auf einem
Kegelsitz 13 des Gewindeeinsatzes 7 aufliegt. Wird die
Entlüftungsschraube 9 nach unten in die öffnungsstellung
geschraubt, so bewegt sich die Schraube 9 in Richtung der
Stirnseite 14 der Welle 4 und verschließt dabei die
Öffnung bzw. Mündung 15 der Wellenbohrung 5, wie in Fig.
2 dargestellt. Hierdurch kann kein Wasser mehr aus der
Wellenbohrung 5 austreten und allein Luft tritt neben der
Entlüftungsschraube 9 nach oben aus.At the inner end of the
In einer nicht dargestellten Ausführungsform kann die
Entlüftungsschraube 9 auch direkt in der Öffnung 6
eingeschraubt sein, insbesondere wenn die Öffnung 6 einen
geringeren Durchmesser besitzt. Ferner kann die
Entlüftungsschraube 9 eine Schlüsselfläche seitlich
aufweisen. In an embodiment not shown, the
Die Kreiselmotorpumpe wird vorzugsweise so eingebaut, daß
die Welle bzw. Achse senkrecht steht, wobei die
Entlüftungsschraube 9 oben liegt. Vorzugsweise besitzt
die Pumpe mehrere Pumpenstufen. Schließlich kann zwischen
dem Kopf 11 und dem oberen Ende der Welle 4 ein
Zwischenteil angeordnet sein, das insbesondere am Kopf 11
befestigt ist, um eine Verlängerung darzustellen oder
eine größere Dichtigkeit zu erreichen.The centrifugal motor pump is preferably installed so that
the shaft or axis is vertical, the
Claims (7)
- A motor-driven centrifugal pump having a cam (2) through which a pumping medium flows for cooling, the pumping medium flowing back into the pump intake chamber via a shaft bore (5) and a bleed screw (9) being disposed at the bottom of the cam for bleeding the cam chamber, characterised in that in the opened state the bleed screw (9) closes the shaft bore (5) directly or via an intermediate member.
- A motor-driven centrifugal pump according to claim 1, characterised in that at its inner end the bleed screw (9) has a head (11) and in the closed state bears via a conical rear side annular face (12) against a conical seat face (13) of a bore (8) into which the bleed screw is screwed.
- A motor-driven centrifugal pump according to claim 2, characterised in that in the opened state the front side of the head (11) of the bleed screw (9) bears against the shaft end.
- A motor-driven centrifugal pump according to one of the previous claims, characterised in that the bleed screw (9) is received in a screwthreaded insert (7) attached at the end of the cam (2).
- A motor-driven centrifugal pump according to one of the previous claims, characterised in that for its actuation the outside of the bleed screw (9) is formed with a polygonal, more particularly a hexagonal blind bore.
- A motor-driven centrifugal pump according to one of the previous claims, characterised in that the shaft (4) stands vertical.
- A motor-driven centrifugal pump according to one of the previous claims, characterised in that it has a number of pump stages.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19819690A DE19819690A1 (en) | 1998-05-02 | 1998-05-02 | Centrifugal pump with bleed screw |
| DE19819690 | 1998-05-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0953772A1 EP0953772A1 (en) | 1999-11-03 |
| EP0953772B1 true EP0953772B1 (en) | 2001-02-07 |
Family
ID=7866517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99108733A Expired - Lifetime EP0953772B1 (en) | 1998-05-02 | 1999-04-30 | Centrifugal pump with bleed screw |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0953772B1 (en) |
| DE (2) | DE19819690A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009033111A1 (en) * | 2009-07-15 | 2011-02-03 | Ksb Aktiengesellschaft | containment shell |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB834951A (en) * | 1957-10-28 | 1960-05-11 | Faere Armaturfabrik Ab | Improvements in or relating to electromotor-driven centrifugal pump assemblies |
| GB963993A (en) * | 1960-10-17 | 1964-07-15 | Hollesens Fabrikker As H | Improvements in and relating to electric motor-driven liquid pumps |
| FR1399292A (en) * | 1964-06-22 | 1965-05-14 | Taco Inc | Pump |
| DE7523874U (en) * | 1975-07-26 | 1976-08-05 | Wilo-Werk Gmbh & Co - Pumpen - Und Apparatebau, 4600 Dortmund | TUGLESS PUMP UNIT |
| DE2941133C2 (en) * | 1979-10-10 | 1985-01-31 | Speck-Kolbenpumpen-Fabrik Otto Speck Kg, 8192 Geretsried | Heating circulation pump |
| DE3701562C2 (en) * | 1986-03-12 | 1996-02-08 | Wilo Gmbh | Centrifugal pump with canned motor |
| DE4208829C2 (en) * | 1992-03-19 | 1995-04-27 | Wilo Gmbh | Canned motor pump |
-
1998
- 1998-05-02 DE DE19819690A patent/DE19819690A1/en not_active Withdrawn
-
1999
- 1999-04-30 DE DE59900040T patent/DE59900040D1/en not_active Expired - Lifetime
- 1999-04-30 EP EP99108733A patent/EP0953772B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE59900040D1 (en) | 2001-03-15 |
| DE19819690A1 (en) | 1999-11-04 |
| EP0953772A1 (en) | 1999-11-03 |
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