EP0386010A1 - Wheel for centrifugal pumps. - Google Patents
Wheel for centrifugal pumps.Info
- Publication number
- EP0386010A1 EP0386010A1 EP88907657A EP88907657A EP0386010A1 EP 0386010 A1 EP0386010 A1 EP 0386010A1 EP 88907657 A EP88907657 A EP 88907657A EP 88907657 A EP88907657 A EP 88907657A EP 0386010 A1 EP0386010 A1 EP 0386010A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cover plate
- blades
- impeller
- centrifugal pump
- vanes
- 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
Links
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
- F04D29/2205—Conventional flow pattern
- F04D29/2222—Construction and assembly
Definitions
- the invention relates to a centrifugal pump impeller according to the preamble of the main claim.
- Centrifugal pump impellers can be manufactured in various ways.
- closed impellers blades are arranged between two cover disks, which form the impeller channels.
- These impellers are generally made as cast or sheet metal structures.
- the cast construction has the disadvantage that impellers with small outlet widths cannot be produced with this method, since there are difficulties with the very narrow cast cores which determine the cross section of the blade channels.
- GB-PS 537 727 offers a solution to this problem in such a way that a so-called open impeller is created, so to speak, which is converted into a closed impeller with the aid of a cover disk designed as a separate component.
- a cover plate designed as a casting with cast-on blades is produced, which is possible without the use of complicated parts.
- the DE-PSen 509 458 and 737 000 show impellers whose paddle-less suction-side cover disks bear against bladed pressure-side cover disks and are detachably connected to the impeller hubs. These are pumps for use in the field of food technology, which require access to the inside of the impeller and therefore a removable impeller cover plate for better cleaning. It is known from US Pat. No. 1,849,557 to produce a bladed base body that is just still castable, in which the blades are exposed in the area of the impeller outlet. By z. B. Mechanical processing of the exposed blade parts, the blade width is brought to the hydraulically required level and then the impeller is covered by means of separate cover plate parts.
- GB-PS 728 972 shows a centrifugal pump impeller composed of several thick-walled parts, in which, in order to avoid cavitation damage in the inlet area, the flow-carrying parts are coated with stainless steel or where parts made of stainless steel are used.
- the suction-side cover plate is formed in two parts, a cylindrical inlet ring forming the suction mouth being liquid-tightly welded to a curved impeller cover plate.
- the blades themselves are continuously welded to the suction and pressure side cover plates
- the invention has for its object one for centrifugal pump impellers assembled from individual sheet metal parts Find a construction that is suitable for high speeds (up to approx. 4300 rpm) and is insensitive to static and dynamic loads. This object is achieved in accordance with the characterizing part of the main claim.
- the solution according to the invention lies in complete contrast to this. It was recognized as essential that a good connection between the blades and the force-introducing cover plate is required.
- the design according to the invention serves to avoid tension or deformation of the impeller, which is responsible for tearing of the individual parts in the area of the connections.
- the very high loads in the impeller inlet area are reliably absorbed by the very stiff bond between the suction mouth and the blades.
- the lower load level prevailing in the impeller outlet area is taken into account. Accordingly, the decoupling prevents the different deformations from being transferred to the other part.
- Embodiments of the invention provide that the bladeless cover plate is welded to the blades.
- a further embodiment of the invention has proven to be advantageous, according to which welding points for attaching the bladeless cover plate to the blades are arranged at the same distance from the axis of rotation.
- this solution represents a departure from the usual design principles.
- a further embodiment of the invention provides that the attachment point for the suction mouth lies on a conical surface whose half cone angle ⁇ formed with the axis of rotation has a value between 40 ° and 65 °, the intersection of the conical surface with the axis of rotation by a on the outside of the bladed Cover disk is defined from the outer diameter of the impeller to the axis of rotation.
- the arrangement of the attachment point between the suction mouth and the blade assembly which is preferably carried out as a welded connection, produces an extraordinarily high rigidity of the blade assembly in the range specified. Due to the fact that there is no connection between the suction mouth and the vane-free cover plate, a decoupling occurs, as a result of which damage to the connection points or welding points is avoided.
- the largest outer diameter of the suction mouth is a maximum of 25 mm larger than the inlet diameter. This measure, which ensures easy deformability of the suction mouth, ensures sufficient coverage of the blade inlet and thus stiffening of the impeller inlet area.
- a seal is arranged in the overlap area between the bladeless cover disk and the suction mouth. This measure prevents backflows between the impeller channels and the wheel side space.
- Yet another embodiment of the invention provides that one or more sheet metal parts, which form the blades, are attached to the bladed force-transmitting cover disk.
- the bladed cover disk which is responsible for the transmission of forces between the drive motor and the liquid to be pumped, has a corresponding connection to the pump shaft. According to the power to be transmitted, the connection points between the force-exceeding cover plate and the blades attached to it are dimensioned accordingly.
- a further embodiment of the invention provides that the bladed cover plate is provided with beads running between the blades and corresponding to the shape of the blade channel. This measure ensures excellent concentricity of the centrifugal pump impeller.
- An additional advantage arises when using blades whose blade root is angled in an L-shape relative to the flow-carrying blade surface. It can be attached between the individual beads, which results in a particularly smooth flow channel if the depth of the bead corresponds to the thickness of the blade root. In the opposite case, when fastening the blade feet directly on the beads, the impeller outlet width is increased.
- Fig. 1 shows a cross section through an impeller designed according to the invention
- Fig. 2 is a plan view of the bladed cover plate.
- FIG. 1 shows a cross section through the impeller (1) designed according to the invention.
- a hub (3) is arranged on a pump shaft (2), by means of which the forces to be transmitted are introduced into a bladed cover disk (4).
- a plurality of blades (5) are fastened to the bladed cover plate (4) by means of a welded connection. Soldered or adhesive connections are also possible.
- the use of a wide variety of blade shapes is possible, with the only important thing being that a reliable fastening takes place between the blade feet and the force-transmitting cover disk. This can be done in a simple manner, for. B. be ensured by means of the number of welded joints, the material dimensioning and the shape.
- a suction mouth (6) designed as a separate component, which covers the inlet area of the blade channels (7) and is attached directly to the blades (5).
- the attachment here is carried out by a weld seam (8), which creates a connection with the blades (5) or their blade heads in the area of the largest diameter of the suction mouth (6).
- a weld seam (9) can also be arranged directly in the inlet area of the impeller or in between.
- the blade-free cover disk (10) lies directly against the blades (5) or their blade heads and is connected to them by welding points (11).
- the welding points (11) are arranged here on a circle, the diameter of which is smaller than the outer diameter of the impeller. A possible reduction in the outer diameter of the impeller in the sense of the known turning does not impair the strength of the construction.
- the cone (12) is shown in dashed lines, on the imaginary surface of which the connection between the blades (5) and the suction mouth (6) takes place.
- the half cone angle ( ⁇ ), formed by the axis of rotation and the cone surface, is of the order of 40 ° to 65 °.
- the point of intersection of the cone with the axis of rotation is the point at which a solder (13) cut from the outer diameter of the impeller on the outside of the bladed cover disc intersects the axis of rotation.
- FIG. 2 shows a top view of the bladed cover disk or a view of the rear of the impeller.
- the beads (14) embossed therein correspond in their course to the course of the blade channel (7).
- Surfaces (15) remaining between the beads serve to accommodate the blade feet (16), cf. Fig. 1.
- the depth of the beads (14) corresponds to the material thickness of the blade feet (16), which results in a smooth-surface blade channel.
- the connection of the blade feet (16) to the bladed cover plate (4) is carried out here by means of several welding points (17).
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT88907657T ATE72883T1 (en) | 1987-09-17 | 1988-09-09 | CENTRIFUGAL PUMP IMPELLER. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE3731161A DE3731161C2 (en) | 1987-09-17 | 1987-09-17 | Centrifugal pump impeller |
DE3731161 | 1987-09-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0386010A1 true EP0386010A1 (en) | 1990-09-12 |
EP0386010B1 EP0386010B1 (en) | 1992-02-26 |
Family
ID=6336169
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88907657A Expired - Lifetime EP0386010B1 (en) | 1987-09-17 | 1988-09-09 | Wheel for centrifugal pumps |
Country Status (8)
Country | Link |
---|---|
US (1) | US5082425A (en) |
EP (1) | EP0386010B1 (en) |
CN (1) | CN1015068B (en) |
AT (1) | ATE72883T1 (en) |
CA (1) | CA1321103C (en) |
DE (2) | DE3731161C2 (en) |
IN (1) | IN169694B (en) |
WO (1) | WO1989002538A1 (en) |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3939156C2 (en) * | 1989-11-27 | 1994-01-27 | Grundfos International A S Bje | Compound impeller for a centrifugal pump |
US5336050A (en) * | 1993-05-06 | 1994-08-09 | Penn Ventilator Co. Inc. | Ventilator fan device |
DE4446193C2 (en) * | 1994-12-23 | 1997-01-09 | Grundfos As | Internals for centrifugal pumps and processes for their manufacture |
DE19746850A1 (en) * | 1997-10-23 | 1999-04-29 | Wilo Gmbh | Impeller made of sheet metal |
US6447244B1 (en) | 1999-05-14 | 2002-09-10 | Argo-Tech Corporation | Centrifugal pump apparatus and method for using a single impeller with multiple passes |
US6398494B1 (en) | 1999-05-14 | 2002-06-04 | Argo-Tech Corporation | Centrifugal pump impeller |
US6447262B1 (en) | 1999-05-14 | 2002-09-10 | Argo-Tech Corporation | Pumping system for a multi-stage pump |
CA2358722A1 (en) * | 2001-10-11 | 2003-04-11 | Alstom Canada Inc. | Centripetal vortex type hydraulic turbine, and axial nozzle ring |
EP1795759A2 (en) * | 2002-08-28 | 2007-06-13 | Ebara Corporation | Centrifugal impeller and pump apparatus |
CN1546868A (en) * | 2003-12-04 | 2004-11-17 | 北京本然科技有限公司 | High potential ratio, inner antifriction, centripetal supercharging centrifugal pump and its combined method of technology and examples |
AT506342B1 (en) | 2008-01-25 | 2011-03-15 | Bitter Engineering & Systemtechnik Gmbh | WHEEL FOR A PUMP |
JP4561852B2 (en) * | 2008-03-26 | 2010-10-13 | 株式会社日立プラントテクノロジー | Impeller |
US9599120B2 (en) * | 2012-08-24 | 2017-03-21 | Asmo Co., Ltd. | Impeller for centrifugal pump and centrifugal pump of vehicle washer device |
FR3007086B1 (en) * | 2013-06-18 | 2015-07-03 | Cryostar Sas | CENTRIFUGAL WHEEL |
DE102015202417A1 (en) | 2015-02-11 | 2016-08-11 | Ksb Aktiengesellschaft | Stömungsführendes component |
DE102016217110A1 (en) | 2016-09-08 | 2018-03-08 | KSB SE & Co. KGaA | rotary pump |
CN109322842B (en) * | 2018-11-26 | 2024-03-15 | 昆山佰斯拓机械设备有限公司 | Volute-free centrifugal ventilator with front cover plate blades and notches and working method |
DE102022201438A1 (en) | 2022-02-11 | 2023-08-17 | Robert Bosch Gesellschaft mit beschränkter Haftung | Pump rotor and pump impeller for a pump rotor |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE509458C (en) * | 1929-02-23 | 1930-10-09 | Naamlooze Vennootschap Konink | Closed impeller for centrifugal pumps, especially for foaming liquids |
US1849557A (en) * | 1929-06-12 | 1932-03-15 | M T Davidson Company | Centrifugal pump |
US2344444A (en) * | 1940-03-29 | 1944-03-14 | Malczewski Jeremi | Construction of turbomachines |
GB537727A (en) * | 1940-04-03 | 1941-07-03 | Coventry Climax Eng Ltd | Improvements in centrifugal pumps |
DE737000C (en) * | 1941-09-28 | 1943-07-03 | Holstein & Kappert Maschf | Centrifugal pump for milk, cream or other liquid foods |
DE906975C (en) * | 1950-05-03 | 1954-03-18 | Licentia Gmbh | Impeller for radial turbo compressors |
GB728972A (en) * | 1952-09-19 | 1955-04-27 | English Electric Co Ltd | Improvements in and relating to hydraulic turbines and pumps |
US3025069A (en) * | 1957-01-14 | 1962-03-13 | Bell & Gossett Co | Seat for rotary mechanical seals |
FR2312671A1 (en) * | 1975-05-30 | 1976-12-24 | Creusot Loire | PROCESS FOR MAKING A CENTRIFUGAL BLADE WHEEL AND WHEEL OBTAINED BY THIS PROCESS |
FI61233C (en) * | 1978-08-23 | 1982-06-10 | Nokia Oy Ab | VINGHJUL HOS EN CENTRIFUGALFLAEKT SAERSKILT EN HOEGTRYCKSFLAEKT |
GB2067673B (en) * | 1980-01-22 | 1983-08-24 | Mercantile Ab Oy | Centrifugal blower impeller |
DE3517499A1 (en) * | 1985-05-15 | 1986-11-20 | Klein, Schanzlin & Becker Ag, 6710 Frankenthal | WHEEL |
SU1373883A1 (en) * | 1986-01-17 | 1988-02-15 | Производственное объединение "Невский завод" им.В.И.Ленина | Centrifugal compressor impeller |
DE3702016A1 (en) * | 1987-01-24 | 1988-08-04 | Klein Schanzlin & Becker Ag | DEVICE FOR FASTENING A CENTRIFUGAL PUMP WHEEL FROM A SPROEDEN MATERIAL |
US4720242A (en) * | 1987-03-23 | 1988-01-19 | Lowara, S.P.A. | Centrifugal pump impeller |
-
1987
- 1987-09-17 DE DE3731161A patent/DE3731161C2/en not_active Expired - Fee Related
-
1988
- 1988-08-29 IN IN719/CAL/88A patent/IN169694B/en unknown
- 1988-09-09 WO PCT/EP1988/000823 patent/WO1989002538A1/en not_active Application Discontinuation
- 1988-09-09 US US07/466,451 patent/US5082425A/en not_active Expired - Fee Related
- 1988-09-09 DE DE8888907657T patent/DE3868643D1/en not_active Expired - Lifetime
- 1988-09-09 AT AT88907657T patent/ATE72883T1/en not_active IP Right Cessation
- 1988-09-09 EP EP88907657A patent/EP0386010B1/en not_active Expired - Lifetime
- 1988-09-15 CN CN88106786A patent/CN1015068B/en not_active Expired
- 1988-09-16 CA CA000577594A patent/CA1321103C/en not_active Expired - Fee Related
Non-Patent Citations (1)
Title |
---|
See references of WO8902538A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1032063A (en) | 1989-03-29 |
DE3868643D1 (en) | 1992-04-02 |
WO1989002538A1 (en) | 1989-03-23 |
IN169694B (en) | 1991-12-07 |
EP0386010B1 (en) | 1992-02-26 |
DE3731161A1 (en) | 1989-05-03 |
US5082425A (en) | 1992-01-21 |
ATE72883T1 (en) | 1992-03-15 |
CN1015068B (en) | 1991-12-11 |
DE3731161C2 (en) | 1996-12-12 |
CA1321103C (en) | 1993-08-10 |
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Legal Events
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EN | Fr: translation not filed | ||
NLV1 | Nl: lapsed or annulled due to failure to fulfill the requirements of art. 29p and 29m of the patents act | ||
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