WO2010048905A1 - Impeller of hydraulic machines - Google Patents

Impeller of hydraulic machines Download PDF

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Publication number
WO2010048905A1
WO2010048905A1 PCT/CZ2009/000128 CZ2009000128W WO2010048905A1 WO 2010048905 A1 WO2010048905 A1 WO 2010048905A1 CZ 2009000128 W CZ2009000128 W CZ 2009000128W WO 2010048905 A1 WO2010048905 A1 WO 2010048905A1
Authority
WO
WIPO (PCT)
Prior art keywords
blades
impeller
outlet
inlet
max
Prior art date
Application number
PCT/CZ2009/000128
Other languages
French (fr)
Inventor
František POCHYLÝ
Čestmír ONDRŮŠEK
Jindřich VESELÝ
Original Assignee
Vysoké Učení Technické V Brně
Čkd Blansko Engineering, A.S.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to CZPV2008-672 priority Critical
Priority to CZ2008-672A priority patent/CZ304593B6/en
Application filed by Vysoké Učení Technické V Brně, Čkd Blansko Engineering, A.S. filed Critical Vysoké Učení Technické V Brně
Publication of WO2010048905A1 publication Critical patent/WO2010048905A1/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/18Rotors
    • F04D29/22Rotors specially for centrifugal pumps
    • F04D29/2261Rotors specially for centrifugal pumps with special measures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/18Rotors
    • F04D29/22Rotors specially for centrifugal pumps
    • F04D29/24Vanes
    • F04D29/242Geometry, shape
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/66Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/669Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps

Abstract

The essence of the invention is an impeller of hydraulic machines created with a supporting disc (1) procured with blades (2) creating through-flow channels (3), wherein the blades (2) are in diameter direction on the supporting disc (1) set irregularly and are created in the way that at least on of the through-flow channels (3) has different shape and different through-flow crosscut whereas the particular blades (2) of an irregular blade cascade are created in the way that their basic parameters an inlet angle (βi), an outlet angle (β2) and a wrapping angle (y) are in relation β1max = βi ± 20° β2max = β2 ± 20° Y max = Y ± 20° and the size of inlet spacing (t) on inlet edges (21) and outlet spacing (T) on outlet edges (22) of the blades (2) are in relation t max = t ± 20%t T max = T ± 20%T.

Description

Impeller of hydraulic machines

Art domain

This invention concerns construction modification of the blades of the impeller of hydraulic machines, for example centrifugal pumps and water turbines.

Present Prior Art

At present the impellers of the hydraulic machines are usually designed with periodical blade cascade, i.e. the blades have the same spacing on inlet and outlet edges, when all the blades have the same shape. A result of this design set is too steep efficiency characteristic η, expressing reliance of water column H on the flow Q of water machine, thus the water machines have optimal efficiency η only at given rotation speed of the impeller, thus for one flow, i.e. one operating point. At lower or higher flow of hydraulic media the value of hydraulic efficiency steeply decreases and furthermore pressure and flow pulsations of the liquid rise significantly and separation of boundary layer of the liquid occurs.

The suppression of pressure and also of flow pulsations of pumped liquid and vibrations of the construction itself both in hydraulic machines and in gas turbines or ventilators is solved in different ways; one of them is irregular set of impellers' blades. Uneven set of the blades of axial machines transferring gaseous media is known for example from the files: US 3,883,264, US 4,253,800, US 4,474,534, US 7,029,227, JP 6248902 or FR 2617914, wherein is altogether solved the problematic of decreasing of the device's vibrations.

Uneven set of stator blade cascade of hydraulic pumping devices is then described for example in the files CN 2440115, GB 2420157 or EP 1956247, which also solve decrease of acoustic pressure transmitted into surrounding. The next known solution is design of the impeller with disposed short blades as it is described for example in the files US 6,508,626 or CZ 17672 U1 , when the blades and the short blades are evenly set around periphery of the impeller and the angle of their outlet flow surface is constant on all the periphery. With regard to nowadays requirements for hydraulic systems dynamic, at present it is not, concerning hydraulic machines, insisted only on their maximal efficiency, but there is an effort to reach wide operating spectrum with high efficiency as well. The aim of submitted solution is to modify the construction of the impeller to flat characteristic Q - H in the widest operating spectrum to be reached, thus at different flows of the hydraulic media through the given system.

The essence of the invention

The mentioned aim is reached with an invention of an impeller of hydraulic machines created with a supporting disc procured with blades which creates through -flow channels, whose essence consists in fact that the blades are in peripheral direction on the supporting disc set irregularly and are created in the way that at least one from the through-flow channels has different shape and/or different through-flow cross-section.

The next essence of the invention is that particular blades of uneven blade cascade are created in the way that for their basic parameters inlet angle (βi), outlet angle (β∑) and wrapping angle (/) are in relation βimax = βi ± 20°

Figure imgf000004_0001
/ max = / ± 20°.

Furthermore the essence of the invention is that for the size of inlet pitch (t) on inlet edges and outlet pitch (T) on outlet edges of the blades are in relation t max = t ± 20%t T max = T ± 20%T.

Finally the essence of the invention is that the inlet edge of at least one blade is placed on another diameter than inlet diameter (d) of the impeller and that the outlet edge of at least one blade is placed on another diameter than outlet diameter (D) of the impeller. The new impeller design is characterized by its unlike size of the through-flow channels between individual blades, where each through-flow channel has other operation optimum, thus its shape is calculated and tuned on different parameters. By this modification was significantly decreased machine sensitivity to flow change and was widened its operating spectrum in the way that it has flat characteristic at conservation of relatively high efficiency.

Description of the figures on enclosed drawings

A particular example of the invention design is schematically illustrated on enclosed drawings, where fig.1 illustrates five blades impeller crosscut in ground plan view and fig.2 illustrates a crosscut of six blades impeller alternative design in ground plan view

Examples of the invention design

An impeller of hydraulic machines is created with a supporting disc 1, on its upper surface are set blades 2 creating through-flow channels 3. Particular blades 2 are corresponding with required parameters for the machine operating and are set on the supporting disc 1 irregularly and create so called irregular cascade. The blades 2 are constructed individually and on the supporting disc 1 and are set in a way that either each flow-through channel 3 or some of flow-through channels 3 have different shape thus are tuned for other optimal parameters. The shape of the flow-through channels 3 is dependent on a blade angle J3, which is possible to change along he the whole length L of the blade 2 from an inlet angle βi on an inlet edge 21_of the blades 2 to an outlet angle & on an outlet edge 22 of the blades 2, which results in the change of a wrapping angle y_ between the inlet edge 21 and the outlet edge 22 of the blade 2. A different shape of the flow-through channels 3 is also possible to reach with the change of an inlet pitch t between the inlet edges 21 of the blades 2 and the outlet spacing T between the outlet edges 22 of the blades 2. The basic criteria for the construction of the irregular cascade of the blades 2 are maximal values of their basic parameters - A -

, which compare to even set of the blade grating, are in relations: βimax = βi ± 20°

Figure imgf000006_0001
Y max = Y ± 20° t max = t ± 20% t T max = T ± 20% T

The impeller on the enclosed fig.1 is an example of five blades irregular cascade, where couple of the blades 2A and 2B set by turns are of the same shape and the fifth blade 2C is different in construction, concretely is significantly shorter and creates the flow-through channels 3 with far bigger outlet pitch T.

Described solution is not the only possible solution of the blades 2_irregular cascade of the impeller, but generally the blades 2 can be constructed and set on the supporting disc 1 in the way that their inlet edges 21 do not lay at all the blades 2_on one inlet diameter d at homothetic points of the impeller and eventually their outlet edges 22 do not lay at all the blades 2 on same diameter D of the impeller at homothetic points. Likewise the number of the blades 2 of the impeller can be different and varies in the range from 3 to 18. An example of six blades impeller is then illustrated in the fig. 2.

Above mentioned solution concerns both impeller with supporting or covering disc with applications in water turbines and in classic pumps but also turbines and pumps only with supporting disc and also of special centrifugal pumps for example with shortened or other way adjusted disc.

Industrial use

The impeller with irregular cascade of the blades according to the invention is possible to use for hydraulic centrifugal pumps and water turbines.

Claims

PATENT CLAIMS
1. An impeller of hydraulic machines created with a supporting disc (1) procured with blades (2) creating through-flow channels (3), wherein the blades (2) are in diameter direction on the supporting disc (1 ) set irregularly and are created in the way that at least on of the through-flow channels (3) has different shape and different through- flow crosscut.
2. The impeller according to the claim 1, wherein the particular blades (2) of an irregular blade cascade are created in the way that their basic parameters an inlet angle (βi), an outlet angle (β2) and a wrapping angle (y) are in relation βimax = βi + 20°
Figure imgf000007_0001
Y max = Y ± 20°.
3. The impeller according to the claim 1 or 2, wherein the size of inlet pitch (t) on inlet edges (21 ) and outlet spacing (T) on outlet edges (22) of the blades (2) are in relation t max = t ± 20%t T max = T ± 20%T.
4. The impeller according to some of the claims 1 to 3, wherein the inlet edge (21 ) of at least one blade (2) lays on another than an inlet diameter (d) of the impeller.
5. The impeller according to some of the claims 1 to 4, wherein the outlet edge (22) of at least one blade (2) lays on another than an outlet diameter (D) of the impeller.
PCT/CZ2009/000128 2008-10-29 2009-10-27 Impeller of hydraulic machines WO2010048905A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CZPV2008-672 2008-10-29
CZ2008-672A CZ304593B6 (en) 2008-10-29 2008-10-29 Hydraulic machine impeller wheel

Publications (1)

Publication Number Publication Date
WO2010048905A1 true WO2010048905A1 (en) 2010-05-06

Family

ID=41723025

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CZ2009/000128 WO2010048905A1 (en) 2008-10-29 2009-10-27 Impeller of hydraulic machines

Country Status (2)

Country Link
CZ (1) CZ304593B6 (en)
WO (1) WO2010048905A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102400945A (en) * 2011-11-18 2012-04-04 江苏国泉泵业制造有限公司 Method for designing impeller with inclined vanes for cyclone grinding pump
CN102410247A (en) * 2011-11-03 2012-04-11 江苏国泉泵业制造有限公司 Method for designing impeller of double-flow crushing pump
CN102954032A (en) * 2012-11-22 2013-03-06 无锡惠山泵业有限公司 Centrifugal water pump
CN103994105A (en) * 2014-04-29 2014-08-20 江苏大学 Impeller hydraulic power design method for low-cavitation non-load centrifugal pump
CN105201729A (en) * 2015-10-19 2015-12-30 江苏大学 Multiple-target optimization method for hydraulic performance and outer field flow-induced noise for centrifugal pump as turbine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US912362A (en) * 1907-04-23 1909-02-16 George Marie Capell Centrifugal fan and pump.
EP0676546A1 (en) * 1994-03-07 1995-10-11 Carrier Corporation Impeller for tranverse fan
DE4418662A1 (en) * 1994-05-27 1995-11-30 Grundfos As Centrifugal fluid delivery pump impeller
EP1249615A2 (en) * 2001-04-12 2002-10-16 Robert Bosch Gmbh Blower rotor
US20040202539A1 (en) * 2001-05-09 2004-10-14 Andreas Blank Rotor disk

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US912362A (en) * 1907-04-23 1909-02-16 George Marie Capell Centrifugal fan and pump.
EP0676546A1 (en) * 1994-03-07 1995-10-11 Carrier Corporation Impeller for tranverse fan
DE4418662A1 (en) * 1994-05-27 1995-11-30 Grundfos As Centrifugal fluid delivery pump impeller
EP1249615A2 (en) * 2001-04-12 2002-10-16 Robert Bosch Gmbh Blower rotor
US20040202539A1 (en) * 2001-05-09 2004-10-14 Andreas Blank Rotor disk

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102410247A (en) * 2011-11-03 2012-04-11 江苏国泉泵业制造有限公司 Method for designing impeller of double-flow crushing pump
CN102400945A (en) * 2011-11-18 2012-04-04 江苏国泉泵业制造有限公司 Method for designing impeller with inclined vanes for cyclone grinding pump
CN102954032A (en) * 2012-11-22 2013-03-06 无锡惠山泵业有限公司 Centrifugal water pump
CN103994105A (en) * 2014-04-29 2014-08-20 江苏大学 Impeller hydraulic power design method for low-cavitation non-load centrifugal pump
CN105201729A (en) * 2015-10-19 2015-12-30 江苏大学 Multiple-target optimization method for hydraulic performance and outer field flow-induced noise for centrifugal pump as turbine

Also Published As

Publication number Publication date
CZ304593B6 (en) 2014-07-23
CZ2008672A3 (en) 2010-05-12

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