EP0750119B1 - Pump impeller - Google Patents

Pump impeller Download PDF

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Publication number
EP0750119B1
EP0750119B1 EP95117565A EP95117565A EP0750119B1 EP 0750119 B1 EP0750119 B1 EP 0750119B1 EP 95117565 A EP95117565 A EP 95117565A EP 95117565 A EP95117565 A EP 95117565A EP 0750119 B1 EP0750119 B1 EP 0750119B1
Authority
EP
European Patent Office
Prior art keywords
impeller
pump
blade
thickening
starting zone
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
Application number
EP95117565A
Other languages
German (de)
French (fr)
Other versions
EP0750119A1 (en
Inventor
Manfred Zelder
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.)
Wilo GmbH
Original Assignee
Wilo GmbH
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Filing date
Publication date
Application filed by Wilo GmbH filed Critical Wilo GmbH
Publication of EP0750119A1 publication Critical patent/EP0750119A1/en
Application granted granted Critical
Publication of EP0750119B1 publication Critical patent/EP0750119B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/2238—Special flow patterns
    • F04D29/225—Channel wheels, e.g. one blade or one flow channel
    • 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
    • F04D29/18—Rotors
    • F04D29/22—Rotors specially for centrifugal pumps
    • F04D29/24—Vanes
    • F04D29/242—Geometry, shape
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2225/00—Synthetic polymers, e.g. plastics; Rubber

Definitions

  • the invention relates to a pump impeller Radial centrifugal pump in particular with a submersible pump two curved blades attached to one of the impeller hub nearby disc are firm, with the two on the suction side Buckets protrude freely into the pump room without touching one another impeller disc to be firm (half-open Wheel).
  • the impeller is known for clog-free pumps to do with a single shovel.
  • Such single-bladed impellers have a lower one Efficiency and lead to a so-called hydrodynamic imbalance caused by the asymmetrical Passing the only shovel past the discharge nozzle arises.
  • the mechanical unbalance is added to the hydrodynamic imbalance, it being known the mechanical imbalance due to an asymmetrical distribution counteracting the masses in the impeller.
  • Impellers such as those from US 1959710 and US 1846834 are known. not given. This Impellers are more likely to clog the Pump especially for waste water with material residues such as a rag. A rag can spread over both blades place and get stuck on both blades.
  • the object of the invention is simple construction the freedom from blockage of a radial centrifugal pump to improve the type mentioned at the beginning.
  • the impeller according to the invention thus pays for itself Two-bladed not with increased Risk of constipation, but this calm working Impeller is similar to low clogging as a single-bladed.
  • the thickening the starting area of the first blade on the Side of the blade facing away from the impeller axis is.
  • the thickening should also be in the front curve over the front edge of the bucket.
  • the unbalance is reduced by that the unbalance caused by the thickening through a reduction in mass on the same side of the impeller or through a mass increase on the opposite Impeller side is lifted. It is also an advantage if the impeller is made of plastic.
  • the impeller 1 of a radial centrifugal pump which as Submersible pump can be used, has a circular Disc 2, on the back of which a hub 3 coaxially is molded, in which a socket 4 is cast can to the impeller on the shaft of an electric motor fasten.
  • blades on the front of disc 2 5, 6 in front which protrude freely into the pump chamber, so that it is a half-open impeller.
  • the blades 5 and 6 are opposite each other in a rotationally symmetrical manner molded on the plastic disc 2 and taper in its thickness D towards the pump inlet side.
  • the impeller shown in Figure 1 rotates in Direction of arrow 7 so that the blade leading edges 5a and 6a first on the liquid to be pumped to meet. These leading edge of the bucket are together with an adjoining area as Blade beginning areas 5b, 6b. While the two outside the blade start areas 5b, 6b Blades 5, 6 are identical, there is a Difference in these blade start areas:
  • the thickness D1 is the Blade start area 5b larger than the thickness D2 of the Blade start area 6b, the second blade 6.
  • the exemplary embodiment is the additional thickening of the Initial area 5b of the first blade 5 on the Shaped impeller axis 8 facing away from the blade.
  • the thickness D 1 is only slightly larger than the thickness D2 (0.1-4mm or 5-40% larger than D2) is the effect for greater freedom from constipation.
  • the length of the thickened blade start area 5b is 1/20 to 1/4 of the total length of the first blade 5.
  • the thickening goes in at the blade leading edge 5a their rounding so that the first blade 5 is shaped as aerodynamically as the second Bucket 6.
  • the unbalance caused by the thickening balance, the impeller has on the side of the 5th a mass reduction or on the opposite Side a mass increase.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Geometry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Die Erfindung betrifft ein Pumpenlaufrad einer Radialkreiselpumpe insbesondere einer Tauchmotorpumpe mit zwei gekrümmten Schaufeln, die an einer der Laufradnabe nahen Scheibe fest sind, wobei an der Saugseite die beiden Schaufeln frei in den Pumpenraum ragen, ohne an einer weiteren Laufradscheibe fest zu sein (halboffenes Laufrad).The invention relates to a pump impeller Radial centrifugal pump in particular with a submersible pump two curved blades attached to one of the impeller hub nearby disc are firm, with the two on the suction side Buckets protrude freely into the pump room without touching one another impeller disc to be firm (half-open Wheel).

Für verstopfungsfreie Pumpen ist es bekannt, das Laufrad mit einer einzigen Schaufel auszuführen. Solche einschaufeligen Laufräder haben einen geringeren Wirkungsgrad und führen zu einer sogenannten hydrodynamischen Unwucht, die durch das asymmetrische Vorbeilaufen der einzigen Schaufel am Druckstutzen entsteht. Hierbei addiert noch die mechanische Unwucht zur hydrodynamischen Unwucht, wobei es bekannt ist, der mechanischen Unwucht durch eine unsymmetrische Verteilung der Massen im Laufrad entgegenzuwirken. The impeller is known for clog-free pumps to do with a single shovel. Such single-bladed impellers have a lower one Efficiency and lead to a so-called hydrodynamic imbalance caused by the asymmetrical Passing the only shovel past the discharge nozzle arises. Here, the mechanical unbalance is added to the hydrodynamic imbalance, it being known the mechanical imbalance due to an asymmetrical distribution counteracting the masses in the impeller.

Diese Unwuchtprobleme sind bei zweischaufeligen Laufrädern wie sie beispielsweise aus der US 1959710 und der US 1846834 bekannt sind. nicht gegeben. Diese Laufräder führen aber leichter zu einem Verstopfen der Pumpe insbesondere bei Abwässern mit Stoffresten wie z.B. einem Lappen. Ein Lappen kann sich über beide Schaufeln legen und damit an beiden Schaufeln hängenbleiben.These unbalance problems are with two-bladed blades Impellers such as those from US 1959710 and US 1846834 are known. not given. This Impellers are more likely to clog the Pump especially for waste water with material residues such as a rag. A rag can spread over both blades place and get stuck on both blades.

Aufgabe der Erfindung ist es, bei einfacher Konstruktion die Verstopfungsfreiheit einer Radialkreiselpumpe der eingangs genannten Art zu verbessern.The object of the invention is simple construction the freedom from blockage of a radial centrifugal pump to improve the type mentioned at the beginning.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst.This object is achieved by the features of claim 1.

Gelangt in ein solches Laufrad ein üblicherweise zur Verstopfung führendes Teil wie z.b. ein Stoffrest, ein Lappen oder eine Strumpfhose, so bleibt dieser in der Regel nicht mittig hängen, sondern die im Anfangsbereich ungleich dicken Schaufeln sorgen dafür, daß das Laufrad sich von diesem Teil schnell lösen kann und es damit weitergefördert wird. Während beim Laufrad mit zwei gleichen Schaufeln der verstopfende Lappen "nicht weiß", für welche Schaufel er sich entscheiden soll, und damit mittig hängen bleibt, wird bei dem Laufrad mit ungleichartigen Schaufeln dafür gesorgt, daß aufgrund dieser Ungleichartigkeit das zur Verstopfung führende Teil sicher weitertransportiert wird.Usually gets into such an impeller Constipation leading part such as a remnant of fabric, a Rag or tights, so this stays in the Do not hang in the middle, but in the beginning unevenly thick blades ensure that the impeller can quickly detach itself from this part and with it is promoted. While the impeller with two same blades the clogging rag "don't know" which shovel to choose, and with that gets stuck in the middle of the wheel dissimilar blades made sure that due to This unevenness leads to constipation Part is safely transported on.

Somit erkauft sich das erfindungsgemäße Laufrad die Zweischaufeligkeit nicht mit einer erhöhten Verstopfungsgefahr, sondern dieses ruhig arbeitende Laufrad ist ähnlich verstopfungsarm wie ein einschaufeliges. The impeller according to the invention thus pays for itself Two-bladed not with increased Risk of constipation, but this calm working Impeller is similar to low clogging as a single-bladed.

Besonders vorteilhaft ist hierbei, wenn die Verdickung des Anfangsbereiches der ersten Schaufel auf der der Laufradachse abgewandten Seite der Schaufel angeordnet ist. Auch sollte die Verdickung in die vordere Rundung der Schaufelvorderkante übergehen.It is particularly advantageous here if the thickening the starting area of the first blade on the Side of the blade facing away from the impeller axis is. The thickening should also be in the front curve over the front edge of the bucket.

Eine Verringerung der Unwucht wird dadurch erreicht, daß die durch die Verdickung erzeugte Unwucht durch eine Massenverringerung auf derselben Laufradseite oder durch eine Massenerhöhung auf der gegenüberliegenden Laufradseite aufgehoben ist. Auch ist von Vorteil, wenn das Laufrad aus Kunststoff ist.The unbalance is reduced by that the unbalance caused by the thickening through a reduction in mass on the same side of the impeller or through a mass increase on the opposite Impeller side is lifted. It is also an advantage if the impeller is made of plastic.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung dargestellt und wird im folgenden näher beschrieben. Es zeigen:

Figur 1:
Eine Draufsicht auf das Laufrad in Ansaugrichtung und
Figur 2:
einen Schnitt durch das Laufrad nach A-D in Figur 1.
An embodiment of the invention is shown in the drawing and will be described in more detail below. Show it:
Figure 1:
A top view of the impeller in the suction direction
Figure 2:
a section through the impeller according to AD in Figure 1.

Das Laufrad 1 einer Radialkreiselpumpe, die als Tauchmotorpumpe einsetzbar ist, weist eine kreisförmige Scheibe 2 auf, an deren Rückseite koaxial eine Nabe 3 angeformt ist, in der eine Buchse 4 eingegossen sein kann, um das Laufrad an der Welle eines Elektromotors zu befestigen.The impeller 1 of a radial centrifugal pump, which as Submersible pump can be used, has a circular Disc 2, on the back of which a hub 3 coaxially is molded, in which a socket 4 is cast can to the impeller on the shaft of an electric motor fasten.

Auf der Vorderseite der Scheibe 2 stehen zwei Schaufeln 5, 6 vor, die frei in den Pumpenraum ragen, so daß es sich um ein halboffenes Laufrad handelt. Die Schaufeln 5 und 6 sind drehsymmetrisch einander gegenüberliegend an der Kunststoffscheibe 2 angeformt und verjüngen sich in ihrer Dicke D zur Pumpeneinlaßseite hin. There are two blades on the front of disc 2 5, 6 in front, which protrude freely into the pump chamber, so that it is a half-open impeller. The blades 5 and 6 are opposite each other in a rotationally symmetrical manner molded on the plastic disc 2 and taper in its thickness D towards the pump inlet side.

Das in Figur 1 dargestellte Laufrad dreht sich in Richtung des Pfeiles 7, so daß die Schaufelvorderkanten 5a und 6a zuerst auf die zu fördernde Flüssigkeit treffen. Diese Schaufelvorderkanten werden zusammen mit einem daran anschließenden Bereich als Schaufelanfangsbereiche 5b, 6b bezeichnet. Während außerhalb der Schaufelanfangsbereiche 5b, 6b die beiden Schaufeln 5, 6 gleich ausgeführt sind, besteht ein Unterschied in diesen Schaufelanfangsbereichen:The impeller shown in Figure 1 rotates in Direction of arrow 7 so that the blade leading edges 5a and 6a first on the liquid to be pumped to meet. These leading edge of the bucket are together with an adjoining area as Blade beginning areas 5b, 6b. While the two outside the blade start areas 5b, 6b Blades 5, 6 are identical, there is a Difference in these blade start areas:

Bei einer der beiden Schaufeln, in diesem Fall bei der ersten Schaufel 5, ist die Dicke D1 des Schaufelanfangsbereiches 5b größer als die Dicke D2 des Schaufelanfangsbereiches 6b, der zweiten Schaufel 6. Im Ausführungsbeispiel ist die zusätzliche Verdickung des Anfangsbereiches 5b der ersten Schaufel 5 auf der der Laufradachse 8 abgewandten Seite der Schaufel angeformt. Obwohl die Dicke D 1 nur wenig größer ist als die Dicke D2 (0,1-4mm bzw. 5-40% größer als D2), so ist die Wirkung für eine größere Verstopfungsfreiheit erheblich.With one of the two blades, in this case with the first blade 5, the thickness D1 is the Blade start area 5b larger than the thickness D2 of the Blade start area 6b, the second blade 6. Im The exemplary embodiment is the additional thickening of the Initial area 5b of the first blade 5 on the Shaped impeller axis 8 facing away from the blade. Although the thickness D 1 is only slightly larger than the thickness D2 (0.1-4mm or 5-40% larger than D2) is the effect for greater freedom from constipation.

Die Länge des verdickten Schaufelanfangsbereiches 5b beträgt 1/20 bis 1/4 der Gesamtlänge der ersten Schaufel 5. Die Verdickung geht an der Schaufelvorderkante 5a in deren Rundung über, so daß die erste Schaufel 5 gleich strömungsgünstig geformt ist, wie die zweite Schaufel 6.The length of the thickened blade start area 5b is 1/20 to 1/4 of the total length of the first blade 5. The thickening goes in at the blade leading edge 5a their rounding so that the first blade 5 is shaped as aerodynamically as the second Bucket 6.

Um die durch die Verdickung erzeugte Unwucht auszugleichen, besitzt das Laufrad auf der Seite der 5 eine Massenverringerung oder auf der gegenüberliegenden Seite eine Massenerhöhung.The unbalance caused by the thickening balance, the impeller has on the side of the 5th a mass reduction or on the opposite Side a mass increase.

Claims (5)

  1. A pump impeller (1) of a radial centrifugal pump, more particularly a submersible motor-driven pump, having two curved vanes (5, 6) which are made fast to a disc adjacent the impeller hub (3), while on the intake side the two vanes extend freely into the pump chamber without being made fast to a further impeller disc, characterised in that that thickened starting zone (5b) of the first vane (5) which first impinges on the fluid has a larger thickness (D1) than the starting zone of the second blade (6), the length of the thickened starting zone (5b) being 1/20 to 1/4 of the total length of the first blade.
  2. A pump impeller according to claim 1, characterised in that the thickening (V) of the starting zone (5b) of the first vane (5) is disposed on the side of the blade remote from the impeller pivot (8).
  3. A pump impeller according to claim 1, characterised in that the thickening (V) merges into the front rounding of the front edge (5a) of the vane.
  4. A pump impeller according to one of the preceding claims, characterised in that the imbalance caused by the thickening (V) compensated by a reduction in mass on the same impeller side or by an increase in mass on the opposite impeller side.
  5. A pump impeller according to one of the preceding claims, characterised in that the impeller (1) is made from plastics.
EP95117565A 1995-06-19 1995-11-08 Pump impeller Expired - Lifetime EP0750119B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19521768 1995-06-19
DE19521768A DE19521768A1 (en) 1995-06-19 1995-06-19 Pump impeller

Publications (2)

Publication Number Publication Date
EP0750119A1 EP0750119A1 (en) 1996-12-27
EP0750119B1 true EP0750119B1 (en) 2000-05-10

Family

ID=7764431

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95117565A Expired - Lifetime EP0750119B1 (en) 1995-06-19 1995-11-08 Pump impeller

Country Status (3)

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US (1) US5692880A (en)
EP (1) EP0750119B1 (en)
DE (2) DE19521768A1 (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2195733B1 (en) * 2001-07-20 2005-08-16 Fagor, S.Coop. HYDRAULIC PUMP WITH FLOW GUIDE.
US6979174B2 (en) * 2003-10-01 2005-12-27 Schlumberger Technology Corporation Stage pump having composite components
JP4554189B2 (en) * 2003-11-26 2010-09-29 株式会社エンプラス Centrifugal impeller
US7544042B2 (en) * 2006-01-03 2009-06-09 Emerson Electric Co. Insert with sleeve for a molded impeller
DE102011007907B3 (en) * 2011-04-21 2012-06-21 Ksb Aktiengesellschaft Impeller for centrifugal pumps
DK2888484T3 (en) * 2012-08-23 2021-05-03 Sulzer Management Ag Pump for transport of wastewater as well as scooters and bottom plate for such
CN103216452B (en) * 2013-04-25 2016-05-11 常州雷利电机科技有限公司 Draining pump
JP6488167B2 (en) * 2015-03-27 2019-03-20 株式会社荏原製作所 Centrifugal pump
AU201614369S (en) * 2016-08-12 2016-10-27 Weir Minerals Australia Ltd Impeller
USD810788S1 (en) * 2016-08-25 2018-02-20 Weir Minerals Australia Ltd. Pump impeller
USD810789S1 (en) * 2016-08-25 2018-02-20 Weir Minerals Australia Ltd. Pump impeller
DE102017221930A1 (en) * 2017-12-05 2019-06-06 KSB SE & Co. KGaA Impeller for wastewater pump

Family Cites Families (12)

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Publication number Priority date Publication date Assignee Title
US553956A (en) * 1896-02-04 Explosive valve for blast-furnaces
US1754992A (en) * 1926-12-06 1930-04-15 American Well Works Centrifugal pump
US1864834A (en) * 1927-12-28 1932-06-28 Buffalo Steam Pump Company Centrifugal pump impeller
US1959710A (en) * 1931-09-21 1934-05-22 Chicago Pump Co Pump
US2265758A (en) * 1940-05-29 1941-12-09 Buffalo Pumps Inc Pump
US4063849A (en) * 1975-02-12 1977-12-20 Modianos Doan D Non-clogging, centrifugal, coaxial discharge pump
US4087994A (en) * 1976-09-07 1978-05-09 The Maytag Company Centrifugal pump with means for precluding airlock
IT8022473A0 (en) * 1979-06-22 1980-05-30 Klein Schanzlin & Becker Ag OPEN IMPELLER FOR CENTRIFUGAL PUMPS.
US4293280A (en) * 1980-08-27 1981-10-06 The United States Of America As Represented By The Secretary Of The Navy Transcavitating propeller
US4681508A (en) * 1984-11-14 1987-07-21 Kim Choong W Supercavitation centrifugal pump
JPS61252893A (en) * 1985-05-02 1986-11-10 Hitachi Ltd Sewage and waste pump
DE4328396A1 (en) * 1993-08-24 1995-03-02 Klein Schanzlin & Becker Ag Bucket wheel for centrifugal pumps

Also Published As

Publication number Publication date
EP0750119A1 (en) 1996-12-27
US5692880A (en) 1997-12-02
DE19521768A1 (en) 1997-01-02
DE59508322D1 (en) 2000-06-15

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