WO2009011636A1 - Device on kaplan turbines in order to provide the rotor blades with microribs and the procedure to make the micro groves on the rotor blades the use of the device at a power station - Google Patents

Device on kaplan turbines in order to provide the rotor blades with microribs and the procedure to make the micro groves on the rotor blades the use of the device at a power station Download PDF

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Publication number
WO2009011636A1
WO2009011636A1 PCT/SE2008/000448 SE2008000448W WO2009011636A1 WO 2009011636 A1 WO2009011636 A1 WO 2009011636A1 SE 2008000448 W SE2008000448 W SE 2008000448W WO 2009011636 A1 WO2009011636 A1 WO 2009011636A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor blades
micro
bar
grinding
power station
Prior art date
Application number
PCT/SE2008/000448
Other languages
French (fr)
Inventor
Ragnar Winberg
Original Assignee
Ragnar Winberg
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
Application filed by Ragnar Winberg filed Critical Ragnar Winberg
Publication of WO2009011636A1 publication Critical patent/WO2009011636A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/14—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding turbine blades, propeller blades or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B19/00—Single-purpose machines or devices for particular grinding operations not covered by any other main group
    • B24B19/02—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements
    • B24B19/028—Single-purpose machines or devices for particular grinding operations not covered by any other main group for grinding grooves, e.g. on shafts, in casings, in tubes, homokinetic joint elements for microgrooves or oil spots
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00—Other grinding machines or devices
    • B24B27/0038—Other grinding machines or devices with the grinding tool mounted at the end of a set of bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
    • F03B3/12—Blades; Blade-carrying rotors
    • F03B3/121—Blades, their form or construction
    • F03B3/123—Blades, their form or construction specially designed as adjustable blades, e.g. for Kaplan-type turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
    • F03B3/12—Blades; Blade-carrying rotors
    • F03B3/126—Rotors for essentially axial flow, e.g. for propeller turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B3/00—Machines or engines of reaction type; Parts or details peculiar thereto
    • F03B3/12—Blades; Blade-carrying rotors
    • F03B3/14—Rotors having adjustable blades
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/20—Hydro energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Turbines (AREA)

Abstract

Device on Kaplan turbines arranged in power stations, characterized by the fact that when in use it includes an in the main vertical bar (11, 17) above the rotor blades (8, 15, 16) and that in the lower part of the bar there are instruments (13, 14, 19) which by grinding can produce with the rotor shaft (1) mainly circular micro ribs situated close to each other on the surface layer of the rotor blades.

Description

Device on Kaplan turbines in order to provide the rotor blades with micro ■ ribs and the procedure to make the micro grooves on the rotor blades. The use of the device at a power station.
It is known since long that a surface lowered into water gets a somewhat smaller resistance against a current of water if it has small ribs parallel with the direction of the current than if the surface is totally smooth.
It is true of ship's propellers that less friction makes the propeller more effective. It is also true of a Kaplan type turbine where it is the water which drives the turbine.
In the Swedish patent 530 428 a procedure is mentioned how to make micro ribs on rotor blades in the main circular with the rotor shaft. This procedure can only take place, however, when the blades are assembled on a device made for this purpose and not when the rotor blades (propeller blades) are on their permanent place. Because of pollution in the water, among other things, the surface layer is worn and the ribs are smoothed away in course of time. To renew the ribs the blades must be removed and mounted in the workshop where the device for making the micro ribs is placed. This is hard work and takes long time. This is also true for the rotor blades on a Kaplan turbine.
The present invention aims at making it possible to provide the rotor blades of a Kaplan turbine with in the main circular micro ribs, lying close to each other, with the rotor shaft as a centre while the turbine blades remain in their permanent
places. As a result a long stoppage can be avoided and the heavy expenses that dismantling and assembling would mean can also be avoided.
The ribs separated by grooves (valleys) which can be produced by grinding or milling will certainly not be so favourably shaped as by the procedure with stamping which is described in the above-mentioned patent application but will give a reduction of friction in the surface which with regard to the cost for the procedure is favourable.
The main part of the device needed to make micro ribs on a Kaplan turbine according to this invention can be moved and used for other Kaplan turbines. There are often several similar turbines beside each other in a power station.
The invention has the characteristics that are evident from the patent claims.
In the following, the main principle for a device for making micro ribs on the rotor blades of a Kaplan turbine will be shown by figures.
Figure 1 shows a vertical section on a Kaplan turbine with a device according to the invention.
Figure 2 shows the turbine according to figure 1 in section A-A. Figure 3 shows a vertical section of another Kaplan turbine with a device according to the invention. Figure 4 shows the turbine according to figure 3 in section B-B.
In figures 1 and 2 the shaft of the turbine, the rotor shaft, is indicated with 1 and the hub of the turbine with 2. The water inlet is indicated with 3 and the water outlet, the so called suction pipe, situated under the rotor blades, with 4. The floor above the turbine is indicated with 5. In the floor there is an opening 6, which can be closed with a door 7. Only one rotor blade 8 has been drawn in. It is turned so that its surface becomes in the main horizontal. The device consists of a support 9 which when in use can be attached to the floor. On this support there is a fastening device 10, in which a bar 11 can move vertically. In the lower part of the bar there is a hinged area 12, in which a grinding instrument can move radially. The grinding instrument can consist of a round grinding wheel 13 driven by an electric motor 14. While the rotor shaft turns slowly grinding grooves can be made which are in the main circular with the rotor shaft as a centre. The grinding wheel can make many grooves beside each other so that a total breadth of several centimetres can be made. After that the rotor shaft can be turned back while the adjacent area is treated. Of course the rotor shaft can be turned so that immediately after a blade has been treated the adjacent blade is treated. It can be arranged so that the treating instrument is moved continuously outward on the arm 12 while the rotor shaft is turned. The bar 11 can be moved vertically during the treatment. If the blades have the shape that they, when turned to an almost horizontal position, somewhat overlap each other, the edge of the lower blade cannot be treated. This means less, however, since the main thing is that the major part of the blade surfaces can get the friction reducing ribs. The most important thing in this connection is that the outer areas of the rotor blades get ribs since the current here is bigger than close to the hub. When grinding or milling no great pressure is needed against the surface which is to be treated. This can be arranged with a tight-fitting hood above the opening 6 through which the bar 11 can move (not in the drawing) so that the treatment can take place also when the turbine room is filled with water.
In figures 3 and 4 a modified device for treatment of the undersides of the rotor blades is shown. The vertical section according to figure 3 is turned 90 degrees in relation to the one in figure 1. Here two rotor blades 15 and 16 have been drawn. The bar 17 is partly movable vertically, partly turnable. A telescopic arm 18 is flexibly fastened to the lower part of the bar so that it can be parallel with the bar when brought down. The arm can be unfolded from the bar when the bar is turned so that the arm has a radial direction. The arm can be unfolded also if the blades overlap each other. In the outer end of the arm there is a grinding tool 19. Since the arm is telescopic and the bar is turnable, the grinding tool can treat a big part of the underside of a blade. By turning the rotor a little, the whole under-surface of a blade can be treated. If the mechanical pressure upwards against the blade surface is not sufficient, greater pressure upwards can be achieved by letting water of high pressure stream out downwards at the grinding instrument. Water can be supplied through a tube along the bar 17. It can be arranged so that when the arm 18 is turned, the grinding instrument 19 always gets such an adjustment that the grooves become at right angles to a radius through the instrument towards the rotor shaft. These devices can be solved by an expert and do therefore not affect the invention whose principle is evident from the patent claims. For treatment of the undersides of the blades, the turbine must be empty of water.

Claims

Claims
1. Device on Kaplan turbines arranged in power stations, characterized by the fact that when in use it includes an in the main vertical bar (1 1, 17) above the rotor blades (8, 15, 16) and that in the lower part of the bar there are instruments (13, 14, 19) which by grinding can produce with the rotor shaft (1) mainly circular micro ribs situated close to each other on the surface layer of the rotor blades.
2. Device according to claim 1, characterized by the fact that the ribs are produced by grinding while the rotor shaft is turned.
3. Device according to some earlier claim, characterized by the fact that the micro ribs have a height of less than 0.3 millimetres.
4. Desvice according to some earlier claim, characterized by the fact that the grinding takes place with rotating tools.
5. Use of a device according to the claims 1 - 4 at a power station which includes a sealing device (7) in the roof above the turbine which can be sealed when the device according to claim 1 is not used.
6. Use of a device according to the claims 1- 4 at a power station which includes a cover in the roof above the turbine through which the bar (11, 17) can move.
7. Procedure to make micro grooves on the rotor blades on Kaplan turbines by a device according to one of earlier claims 1- 4.
PCT/SE2008/000448 2007-07-16 2008-07-14 Device on kaplan turbines in order to provide the rotor blades with microribs and the procedure to make the micro groves on the rotor blades the use of the device at a power station WO2009011636A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0701720A SE0701720L (en) 2007-07-16 2007-07-16 Device for chaplain turbines for supplying the rotor blades with micro-ribs and the method for creating the micro-grooves on the rotor blades. Use of the device at a power plant
SE0701720-5 2007-07-16

Publications (1)

Publication Number Publication Date
WO2009011636A1 true WO2009011636A1 (en) 2009-01-22

Family

ID=39456249

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE2008/000448 WO2009011636A1 (en) 2007-07-16 2008-07-14 Device on kaplan turbines in order to provide the rotor blades with microribs and the procedure to make the micro groves on the rotor blades the use of the device at a power station

Country Status (2)

Country Link
SE (1) SE0701720L (en)
WO (1) WO2009011636A1 (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4602901A (en) * 1983-02-11 1986-07-29 Innse Innocenti Santeustacchio S.P.A. Milling-boring machine
BE1016624A3 (en) * 2005-06-02 2007-03-06 Rompay Boudewijn Gabriel Van Underwater surface for e.g. boat hull or propeller, includes macroscopic irregularities for improving hydrodynamics
WO2007100281A1 (en) * 2006-03-03 2007-09-07 Ragnar Winberg Procedure to provide a propeller with ridges

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4602901A (en) * 1983-02-11 1986-07-29 Innse Innocenti Santeustacchio S.P.A. Milling-boring machine
BE1016624A3 (en) * 2005-06-02 2007-03-06 Rompay Boudewijn Gabriel Van Underwater surface for e.g. boat hull or propeller, includes macroscopic irregularities for improving hydrodynamics
WO2007100281A1 (en) * 2006-03-03 2007-09-07 Ragnar Winberg Procedure to provide a propeller with ridges

Also Published As

Publication number Publication date
SE530429C2 (en) 2008-06-03
SE0701720L (en) 2008-06-03

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