Francis turbine wheel

FIELD: hydroelectric stations and hydraulic drives.

SUBSTANCE: proposed device has blades with cylindrical surfaces arranged between rims. Generatrix of cylindrical surfaces is parallel to axis of hydraulic turbine and rises to axis of hydraulic turbine. Shape of blade of wheel is formed by angle of tilting of skeleton line of blade profile passing from larger part of blade profile changing according to linear dependence to constant profile on the rest of part and selection of parameters of wheel from the following relations: change of β according to linear dependence from β1 to β2 on larger part of blade profile at distance from D1 to 1.01D2, β=const=β2 on the rest part from 1.01D2 to D2, range of rise of generatrix of blade surfaces from (0.08-0.20)D1 at liquid inlet to wheel to (0.15-0.30)D1 at outlet from wheel, D2/D1=(0.6-0.73) where D1 is outer diameter of wheel; D2 is inner diameter of wheel; D2/D1 is relative diameter of wheel; β is angle of tilting of skeleton line of blade profile; β1 is angle of tilting of inlet element of skeleton line of blade profile to circumferential direction; β2 is angle of tilting of outlet element of blade skeleton line.

EFFECT: enlarged range of operation of Francis turbine.

2 dwg

 

The present invention relates to hydraulic turbines and can be used in relation to hydroelectric power plants, or as various hydraulic energy consumers.

Famous Francis pump-turbine, geometrical parameters which allow to increase unit capacity by increasing throughput efficiency remains unchanged (RF Patent No. 1258138, F 03 In 3/02, 1985).

It is also known impeller radial-axial turbines, containing placed between the rims of the blade (Ed. the certificate of the USSR No. 450027, F 03 In 3/02, 1972). In this invention to improve the efficiency and simplify the technology of the wheel blades are made in the form of a cylinder generatrix, increasing to the axis of the turbine and parallel to it.

Known technical solution is closest to the proposed technical result. However, it allows you to get these benefits only in cases when the number of revolutions of the turbine is in the range nI=60÷65 rpm, and the flow rate of working fluid Q'I=(0,23÷0.3 m3/s

The present invention is a further improvement of this technical solution and allows you to extend the range of use of the impeller radial-axial turbines to n'I=50÷75 rpm and Q' I=0,13÷0.5 m3/s

To achieve the technical result of the shape of the blades of the impeller are formed by the angle of the skeletal line of the profile of the blade, passing from changing according to the linear dependence on the greater part of the profile of the blade to the same - on the other part, and selecting the following parameters impeller:

change β linear dependence β1to β2on the most part of the profile of the blade, respectively, at the distance "a" from the D1to 1.01 D2,

β=const=β2the rest of "b-" from 1.01 D2to D2,

the range increases forming surfaces of the blades from (0,08÷0,20)D1at the entrance of fluid to the impeller to (0,15÷0,30)D1when you exit,

D2/D1=(0,60-0,73),

where D1- outer diameter of the impeller,

D2- internal diameter of the impeller,

D2/D1the relative diameter of the impeller,

β - the angle of the skeletal line of the profile of the blade,

β1- the angle of the input element of the skeletal line of the profile of the blade to the district direction,

β2- the angle of the output element of the skeletal line of the profile of the blade.

The invention is illustrated in the drawing, in which figure 1 shows a diagram of the impeller in the Meridian project is AI, figure 2 - view "A" 1.

In space, the rims 1 and 2 wheels posted blade 3 having a cylindrical surface with a generatrix parallel to the axis O-O of the turbine. Line 4 is a skeletal line profile of the blade. The height of the blade "b" increases from=0to=2when reducing the diameter of the location of the blade element from the D1to D2.

The offered wheel is not inferior to conventional radial-axial wheels and prototype with speed nS=80÷175 largest square rotation, limited output edges of the blades.

An experimental study of the turbines with the proposed impeller was conducted on the large-scale models with a diameter of D1=800 mm and 400 mm Studies turbines RO 400/2701÷2705, RO 310/2715÷2722 and RO 230/2711 allowed to determine the influence of parameters β1that β2D2/D1in0/D1and in2/D1on quality hydraulic turbines and to determine the range of parameters that ensure the effectiveness of the proposed impeller.

Impeller radial-axial turbines, containing placed between the rim of the blade, having a cylindrical surface with a generatrix, increasing to the axis of the turbine and parallel to it, characterized in that the shape of the blades, R is the working wheel are formed by the angle of the skeletal line of the profile of the blade, passing from changing according to the linear dependence on the greater part of the profile of the blade to the same on the other part, and the choice of parameters of the impeller of the following ratios: change β linear dependence β1to β2in most parts of the profile of the blade, respectively, at a distance D1to 1.01 D2that β=const=β2the rest of from 1.01 D2to D2the range of ascending forming surfaces of the blades from (0,08÷0,20)D1at the entrance of fluid to the impeller to (0,15÷0,30)D1when you exit, D2/D1=(0,6÷0,73), where D1- outer impeller diameter, D2- internal impeller diameter, D2/D1the relative diameter of the impeller, β - the angle of the skeletal profile blades, β1- the angle of the input element of the skeletal line of the profile of the blade to the district direction, β2- the angle of the output element of the skeletal line of the profile of the blade.



 

Same patents:

FIELD: hydroelectric stations.

SUBSTANCE: proposed method of restoration of serviceability of hydraulic unit can be used at repairs of hydroelectric stations. According to proposed method, air gap is measured over circumference between outer plane of rotor pole and iron core of stator of generator, air gap between blades of working wheel and outer wall of chamber of turbine, air gap between guide bearing of turbine and its shaft are measured and distance from turbine support ring to generating belt of turbine working wheel is measured and value of deflection of hydraulic unit shaft axis from vertical position and degree of bending of shaft axis are determined and value of deflection of housing of turbine working wheel from horizontal position is found and alignment of generator stator in plan is carried out to provide equal of air gap between generator rotor poles and stator iron core and centering of generator stator in height is carried out to align magnetic axis of stator with magnetic axis of rotor of generator and then hydraulic unit is demounted, fixed and position of center of new vertical axis of hydraulic set is held and cold chamber of working wheel is replaced by new one installing it relative to new axis of hydraulic unit, and lower and upper rings of turbine guide assembly are installed in horizontal position with subsequent alignment of rings relative to new vertical axis of hydraulic unit, and then hydraulic unit is mounted in housing. Proposed method provides 2.5-3 times reduction of time taken for restoration as compared with traditional process and 1.5-2 times increase of service life of hydraulic unit after restoration. Moreover, method improves operating characteristics of hydraulic unit as a whole and materially increases degree of its repairability and serviceability at time between overhauls.

EFFECT: increase life, improved operating characteristics.

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Turbine // 2263814

FIELD: mechanical engineering; turbines.

SUBSTANCE: turbine is designed for converting kinetic energy of liquid or gas into mechanical work. Proposed turbine contains cylindrical housing, tangential intake branch pipe arranged over periphery of housing and axial discharge branch pipe arranged in center, and rotor installed on shaft. Rotor is made in form of sup closed at one end. Tangential intake branch pipe is furnished with axial spiral guide member to provide tangential delivery of working medium to cup wall near its open end face. Axial discharge branch pipe is arranged with its inlet hole in cup space. Intake branch pipe is rectangular in section, and discharge branch pipe is round.

EFFECT: simplified design of turbine.

2 cl, 2 dwg

The invention relates to devices designed to convert the energy of the water flow of the river in electrical, namely the impeller turbines used in hydroelectric power plants

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The invention relates to the field of engineering, namely, hydraulic machines working in turbine mode

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Turbine // 2263814

FIELD: mechanical engineering; turbines.

SUBSTANCE: turbine is designed for converting kinetic energy of liquid or gas into mechanical work. Proposed turbine contains cylindrical housing, tangential intake branch pipe arranged over periphery of housing and axial discharge branch pipe arranged in center, and rotor installed on shaft. Rotor is made in form of sup closed at one end. Tangential intake branch pipe is furnished with axial spiral guide member to provide tangential delivery of working medium to cup wall near its open end face. Axial discharge branch pipe is arranged with its inlet hole in cup space. Intake branch pipe is rectangular in section, and discharge branch pipe is round.

EFFECT: simplified design of turbine.

2 cl, 2 dwg

FIELD: hydroelectric stations.

SUBSTANCE: proposed method of restoration of serviceability of hydraulic unit can be used at repairs of hydroelectric stations. According to proposed method, air gap is measured over circumference between outer plane of rotor pole and iron core of stator of generator, air gap between blades of working wheel and outer wall of chamber of turbine, air gap between guide bearing of turbine and its shaft are measured and distance from turbine support ring to generating belt of turbine working wheel is measured and value of deflection of hydraulic unit shaft axis from vertical position and degree of bending of shaft axis are determined and value of deflection of housing of turbine working wheel from horizontal position is found and alignment of generator stator in plan is carried out to provide equal of air gap between generator rotor poles and stator iron core and centering of generator stator in height is carried out to align magnetic axis of stator with magnetic axis of rotor of generator and then hydraulic unit is demounted, fixed and position of center of new vertical axis of hydraulic set is held and cold chamber of working wheel is replaced by new one installing it relative to new axis of hydraulic unit, and lower and upper rings of turbine guide assembly are installed in horizontal position with subsequent alignment of rings relative to new vertical axis of hydraulic unit, and then hydraulic unit is mounted in housing. Proposed method provides 2.5-3 times reduction of time taken for restoration as compared with traditional process and 1.5-2 times increase of service life of hydraulic unit after restoration. Moreover, method improves operating characteristics of hydraulic unit as a whole and materially increases degree of its repairability and serviceability at time between overhauls.

EFFECT: increase life, improved operating characteristics.

4 dwg

FIELD: hydroelectric stations and hydraulic drives.

SUBSTANCE: proposed device has blades with cylindrical surfaces arranged between rims. Generatrix of cylindrical surfaces is parallel to axis of hydraulic turbine and rises to axis of hydraulic turbine. Shape of blade of wheel is formed by angle of tilting of skeleton line of blade profile passing from larger part of blade profile changing according to linear dependence to constant profile on the rest of part and selection of parameters of wheel from the following relations: change of β according to linear dependence from β1 to β2 on larger part of blade profile at distance from D1 to 1.01D2, β=const=β2 on the rest part from 1.01D2 to D2, range of rise of generatrix of blade surfaces from (0.08-0.20)D1 at liquid inlet to wheel to (0.15-0.30)D1 at outlet from wheel, D2/D1=(0.6-0.73) where D1 is outer diameter of wheel; D2 is inner diameter of wheel; D2/D1 is relative diameter of wheel; β is angle of tilting of skeleton line of blade profile; β1 is angle of tilting of inlet element of skeleton line of blade profile to circumferential direction; β2 is angle of tilting of outlet element of blade skeleton line.

EFFECT: enlarged range of operation of Francis turbine.

2 dwg

FIELD: hydraulic engineering.

SUBSTANCE: invention is designed for use on hydroelectric power stations with insignificant fluctuation of lower pond level at high head and water flow ranges. According to invention, vertical shaft of set rest through lower end with cone-shaped working surface of frame-step bearing. Pan is hermetically attached to shaft and working wheel, and suction pipes are attached tangentially to pan. Jets from suction pipes are directed to blades of active wheel freely rotating on shaft and transmitting to shaft rotation through speed-up and direction-change reduction gear, parts of which being parts of hydraulic set. Number of pipes is equal to number of blades. Jet are directed to working surfaces of blades under constant effective angle of action. Seals of reaction wheel are made by elastic box-shaped rings contacting through convex side surfaces from opposite sides exposed to pressure of water. Delivery of water to seal from bottom to top prevents getting of solid particles between friction surfaces.

EFFECT: increased speed and efficiency.

5 dwg

FIELD: turbine engineering.

SUBSTANCE: blade system comprises blades whose inlet and outlet edges are made so that the working section of the inlet blade edge adjacent to the hub prevents against cavitation.

EFFECT: enhanced efficiency and reliability.

2 cl, 5 dwg

FIELD: engines and pumps.

SUBSTANCE: proposed Francis turbine wheel comprises at least two wheel segments 12, 14 that can be jointed together along their opposed surface sections 16, 16a, 18, 18a to make composite wheel with top rim 28, bottom rim 30 and multiple vanes 32 running between said rims and secured thereto. Said opposed surface sections 16, 16a, 18, 18a are arranged solely along top and bottom rim segments. Note that opposed surface sections 16, 16a, 18, 18a of wheel segments 12, 14 are arranged between apart from adjacent vanes. Proposed wheel has central axis. Top rim has central round bore. Opposed surface sections 16, 16a of top rim, if seen from above, run from central bore, radially offset from central axis.

EFFECT: higher reliability and longer life.

7 cl, 2 dwg

FIELD: engines and pumps.

SUBSTANCE: blade system of impeller of radial axial hydraulic turbine includes rim 1, hub 2 and blades 3, each of which is connected to rim 1 and hub 2 and provided with inlet and outlet edges 4 and 5 of bent shape and smoothly changing thickness in the direction from inlet edge to outlet edge and from hub 2 to rim 1. Blades 3 of blade system have thickened part near inlet edge 4. Maximum thickness of blade 3 in its section with hub 2 is more than maximum thickness of blade 3 in its section with rim 1. Optimum intervals of values of parameters are determined: maximum thickness of section of blade 3 with hub 2, maximum thickness of section of blade 3 with rim 1, as well as their location places along straightened middle line of the appropriate section.

EFFECT: preventing flow separation after inlet edges of blades at operation of hydraulic turbine in modes with increased heads and modes with partial loads in the whole range of working heads.

10 dwg

FIELD: machine building.

SUBSTANCE: hydraulic machine comprises an inner and an outer separating circular hydrodynamic seals 8 and 9, arranged into each or one of cavities around an impeller 2 - between the impeller 2 and a cover 5 and between the impeller 2 and a foundation ring 6. The outer separating seal 8 is located in the area of the peripheral zone of the impeller 2, and the inner one 9 - between the outer separating seal 8 and a seal 7, which limits leaks into a suction pipe. Two rings 10 and 11, which form the inner separating seal 9, have a Z-shaped or an angular profile in the cross section and are installed so that free shelves of their cross sections cover each other. Each cavity, where separating seals 8 and 9 are installed, is separated into two chambers 12 and 14. The external chamber 14 is equipped with an input 17 for compressed gas supply.

EFFECT: invention provides for squeezing out water from the peripheral zone of the impeller during operation of the hydraulic machine in the turbine or pump mode and reduction of energy losses for disc friction.

1 dwg

FIELD: machine building.

SUBSTANCE: impeller of Francis type includes rim 1 with rotation symmetry about rotation axis Z of impeller and bent blades 21, 22, which are rigidly attached to rim 1, each of which includes external peripheral edge 212, 222 and internal central edge 211, 221. Connection points B21, B22 of rim 1 with internal central edges 211, 221 of blades 21, 22 are located on one and the same circle C20 centred relative to above mentioned axis Z. Connection points A21, A22 of rim 1 with external peripheral edges 212, 222 of blades 21, 22 are located at least on two different circles C21, C22 centred relative to axis Z.

EFFECT: reduction of the cost of composite elements of devices owing to limiting their dimensions by reducing the action on them of radial stresses under unsteady conditions.

11 cl, 4 dwg

FIELD: machine building.

SUBSTANCE: proposed turbine comprises helical water intake case 1, mount ring 2 furnished with one row of guide vanes arranged in circle, impeller 12, straight convergent water discharge pipe 9 and lateral water discharge box 10. Said ring 2 is arranged at inner side of case 1. Ware outlet between guide vanes in ring 2 is communicated with water inlet formed between vanes 4 with curved surface. Water outlet formed between vanes 4 with curved surface is communicated with inlet of pipe 9. Outlet of said pipe is communicated with water inlet of box 10. seat 6 is arranged at impeller 12. Shaft 7 is fitted in seat 6. Blades of cooling fan are fitted directly on shaft 7. Unit designed rpm is defined by design equation and depends upon impeller water inlet diameter and water inlet pressure.

EFFECT: compact design, high efficiency and lower noise.

7 cl, 5 dwg

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