Impeller for directly connected low-speed small hydraulic turbine of diagonal type used in hydrodynamic power-saving cooling tower

FIELD: machine building.

SUBSTANCE: invention relates to an impeller for a directly connected low-speed small hydraulic turbine of diagonal type, used in a hydrodynamic power-saving cooling tower, which comprises an upper crown, a lower ring and blades with bent surface, installed between the upper crown and the lower ring. The ratio of the height h of the edge 4 of water inlet of each blade to the diameter D1, corresponding to the edge 4 of water inlet makes 0.18-0.22. The ratio of the total height of blades H to the diameter D1 makes 0.35-0.42. The ratio of the diameter D2, corresponding to the point A of crossing of each edge 4 of the water outlet and the lower ring, to the diameter D1 makes 0.4-0.6. The ratio of the diameter D3, corresponding to the point B of crossing of each edge 4 of water inlet and the upper crown to the diameter D1 makes 0.3-0.45. The ratio of the diameter D4 in the position of the round platform of water drainage on the upper crown to the diameter D1 makes 0.1-0.2. The diameter D1 and frequency of rotation of cooling fan blades are related according to certain dependence.

EFFECT: provision of simple design, convenience in development and installation and high efficiency of energy conversion.

2 cl, 4 dwg

 

The technical field to which the invention relates.

The invention relates to a cooling tower, in particular to the impeller turbines, to bring the cooling tower, more specifically, in the invention described impeller directly connected low-speed small hydro diagonal type used in hydrodynamic energy-saving cooling tower, which is not provided with gear and can ensure the equality of the output rotational speed of the turbine of the nominal value of the fan speed through proper design of the impeller turbines to eliminate the gearbox used traditional neprosteno the turbine.

Background of invention

As we all know, for the purpose of the energy conservation in existing cooling tower air conditioning started to use the turbine to bring the cooling fan, thus, completely disposing of the energy circulation flow water cooling towers for energy conversion in the driving force of the turbine; the turbine is used to convert the energy of water into mechanical energy of rotation to bring the cooling fan, thus eliminating the traditional cooling the engine of great power osushestvlyae very significant effect of energy conservation.

At the moment the water column redundant industrial circulating water cooling towers of air-conditioning in China is 4-15 m, and discharge the water column at 0.5-1 m is required in the regulations for the distribution of water pipes to the turbine to remove part of the water column redundant circulating water worked in the environment with backpressure, but the fan speed of the cooling tower must be below to make a direct connection with fan cooling towers, and for this purpose must be selected low-speed turbine diagonal type; however, in the current range of turbines in China is still missing low-speed turbine diagonal type that may be tailored to the working environment and to be directly connected to the cooling fan, and should be accepted mode of reduction for the connection of conventional turbines diagonal type with fan cooling tower through the gearbox, since the operating conditions of the gearbox are worse not only because of the strong noise and short service life, but also because of the corresponding increase in production costs. Therefore, the designed turbine is of diagonal type, which can match the speed to the conditions of the working environment is Reda and can be directly connected to the fan of the cooling tower, thus, having great practical significance.

Summary of the invention

The present invention is to develop a working wheel for directly connected low-speed small hydro diagonal type used in hydrodynamic energy-saving cooling tower, overcoming the problem lies in the fact that the output shaft of the existing turbines cooling tower may cause fan blades only through the reduction gear, as well as problems of high noise, high probability of failure and high production costs, therefore, as a basis for ultimately eliminate the transfer mechanism with gear.

The technical scheme of the invention is as follows:

The impeller is directly connected low-speed small hydro diagonal type used in hydrodynamic energy-saving cooling tower, contains the upper crown 1, the lower ring 3 and the blade 2 with curved surface, installed between the upper crown 1 and the bottom ring 3, and region 4 water inlet is located at one end of each blade 2 with curved surface, and each edge 4 water inlet is a party to the high pressure impeller and also side of the radial inflow of the stream of water, and the edge 5 of the water output is the other end of each blade 2 with curved surface, and each edge 5 of the water output is the low-pressure side of the impeller and also party axial inward flow of water; a connection point between the edges of the 5th year of the water and the bottom ring 2 are a and a connection point between the edges of the 5th year of the water and the top of the crown are In, and the impeller is characterized by the fact that the ratio of the height h of each region 4 water inlet to the diameter D1 corresponding to the edge 4 of the inlet water is 0,18-0,22. the ratio of the total height H of the blades 2 to the diameter D1 is 0,35-0,42, the ratio of the diameter D2 corresponding to the intersection point A of each end of the 5th year of the water and the lower ring 3, the diameter D1 is 0.4 to 0.6, the ratio of the diameter D3 corresponding to the point B of intersection of each edge 4 water inlet and the top of the crown, the diameter D1 is 0.3-0.45 respectively, and the ratio of the diameter D4 in the position of discharge of water round the platform on the top of the crown 1 to the diameter D1 of 0.1-0.2, and the ratio between the diameter D1 of each edge of the inlet water and the frequency of rotation of the blades the cooling fan isD1=n11×H/nwhere n11 is the constant number is called given rotational speed, the value lies in the range 28-42, n is the nominal rotational speed of the blades of the cooling voltage is a, and H is the pressure of the inlet water (water column is taken as a unit: m).

The number of blades 2 with curved surface is 16-20, and the ratio of the minimum thickness to the maximum thickness of the pterygoid forms of the blades is of 0.28-0.34 in.

The invention has the following advantages:

The invention can provide the basis for in order to eliminate the gearbox for the turbines for the cooling tower, through the use of the impeller, designed in the invention, and can be completely satisfied with job demands, and experiments prove that the output speed of the turbine, equipped with impeller, can fully meet operational requirements, and the range of pulsation frequencies of rotation is reduced.

The design is simple, and the installation and use is very convenient.

In regard to the characteristics of the turbines for the cooling tower shows the frequency n11 rotation mainly reduced to the level of not less than 80 during the existing conventional neprosteno turbines, to 28-42; simultaneously, the equation of the curve key elements, namely, guide blades, which can affect the efficiency of the turbine, defined according to the given speed, and the relationship between the size of the impeller and razmara the edges D1 of the water inlet of the blades is obtained from a variety of calculations and experiments, and at the same time it turns out the relationship between D1 and rotation speed of the cooling fan, thus providing a fast and convenient way reasonable design of the impeller.

The experiments show that while the above speed is 28-42, a certain amount D1 of the edges of the water inlet vanes and a certain amount of the impeller can save the overall efficiency of the turbine at about 86%, and when given the speed more than 42 or less than 28, the efficiency sharply falls linearly.

Brief description of drawings

Figure 1 is a schematic view of the spatial structure of the impeller according to the invention.

Figure 2 is a schematic diagram of the dimensions of all parts of the impeller according to the invention.

Figure 3 is a schematic view of the blade with the curved surface according to the invention.

Figure 4 is a drawing in three dimensions with blades curved surface according to the invention.

Detailed description of embodiments of the present invention

Next is a detailed description of the invention through a combination of drawings and descriptions of option exercise. As can be seen from figure 2, the impeller is directly connected low-speed small hydro diagonal t is PA, used in hydrodynamic energy-saving cooling tower, contains the upper crown 1, the lower ring 3 and 16-20 blades 2 with curved surface, installed between the upper crown 1 and the bottom ring 3, as can be seen from figure 1 and the blade 2 with curved surface have a wing-shaped structure, as can be seen from figure 3 and figure 4, and the ratio of the minimum thickness to the maximum thickness of the pterygoid forms of blades is 0,28-0,34, and region 4 water inlet is located at one end of each blade 2 with curved surface, and each edge 4 water inlet is a party to the high pressure impeller and also side of the radial inflow of the stream of water, and the edge 5 of the water output is located at the other end of each blade 2 with curved surface, and each edge of the water output is the low-pressure side of the impeller and also a party to the axial outflow of water flow; and the point A are the connection points between the edges 5 of the release of water and a lower ring 3, and the point B are points of connection between the edges of the 5th year of the water and the top of the crown, and the ratio of the minimum thickness to the maximum thickness of the pterygoid forms of blades with curved surface is 0,28-0,34, and the relationship between the size of the blades 2 with curved surface and the sizes of the respective parts of all the impeller SL is blowing: the ratio of the height h of each region 4 water inlet to the diameter D1. the corresponding edge of the 4 water inlet is 0,18-0,22, the ratio of the total height H of the blades 2 to the diameter D1 is 0,35-0,42, the ratio of the diameter D2 corresponding to the intersection point A of each end of the 5th year of the water and the lower ring 3, the diameter D1 is 0.4 to 0.6, the ratio of the diameter D3 corresponding to the point of intersection of each edge 4 water inlet and the top of the crown, the diameter D1 is 0.3-0.45 respectively, and the ratio of the diameter D4 in the position of discharge of water round the platform on the top of the crown 1 to the diameter D1 of 0.1-0.2, as seen of figure 2. The ratio between the diameter D1 of each edge of the inlet water and the frequency of rotation of the blades of the cooling fan isD1=n11×H/nwhere n11 is the constant number is called given rotational speed, the value lies in the range 28-42, n is the nominal rotational speed of the blades of the cooling fan, and H is the pressure of the inlet water (water column is taken as a unit: m).

In a specific embodiment, when the frequency of rotation of the fan blades of the cooling tower is determined, next, select the value of n11 according to the environment when using, in essence, the selected value is higher in the South and in the North the selected value is less than, greater is nste situations suitable chosen value 35, then the value of D1 may be determined by the pressure of the N intake of water, and the dimensions of all parts, namely, blades with curved surface, the upper crown and the lower ring finally determined according to the value of D1, thereby causing the impeller in accordance with the requirement of the nominal speed.

What follows is a description of several specific examples of calculations:

Example 1

Suppose that n11 is equal to 35, the pressure of the N intake of water is 14 m and the nominal frequency n of rotation of the fan is equal to 136 rpm, then D1 is equal to 0.928 m, and one blade with curved shape is designed in the form shown in figure 3 and 4. Indeed the measured rotation speed of the set of fan blades is equal to 137 rpm, which corresponds to the design requirement.

Example 2

Suppose that n11 is equal to 30, the pressure of the N intake of water is 15 m and the nominal frequency n of rotation of the fan is equal to 140 rpm, then D1 is equal 0,830 m, and one blade with curved shape is designed in the form shown in figure 3 and 4. Indeed the measured rotation speed of the set of fan blades is equal to 138 rpm, which corresponds to the design requirement.

Example 3

Suppose that n11 is equal to 40, the pressure of the N intake of water is 15 m and the nominal frequency n of rotation of the fan is equal to 130 rpm, then D1 is equal 1,192 m, and one blade with isign is a form designed in the form, shown in figure 3 and 4. Indeed the measured rotational speed of the installed fan blades 131 rpm, which corresponds to the design requirement.

Example 4

Suppose that n11 is equal to 28, the pressure H water inlet is 13 m and the nominal frequency n of rotation of the fan is equal to 136 rpm, then D1 is equal 0,742 m, and one blade with curved shape is designed in the form shown in figure 3 and 4. Indeed the measured rotation speed of the set of fan blades is equal to 130 rpm, which corresponds to the design requirement.

Example 5

Suppose that n11 is equal to 42, the pressure of the N intake of water is 10 m and the nominal frequency n of rotation of the fan is equal to 140 rpm, then D1 is equal 0,949 m, and one blade with curved shape is designed in the form shown in figure 3 and 4. Indeed the measured rotation speed of the set of fan blades is equal to 145 rpm, which corresponds to the design requirement.

Example 6

Suppose that n11 is equal to 27, the pressure H water inlet is 13 m and the nominal frequency n of rotation of the fan is equal to 136 rpm, then D1 is equal 0,712 m, and one blade with curved shape is designed in the form shown in figure 3 and 4. Indeed the measured rotation speed of the set of fan blades is equal to 110 rpm, which does not meet the design requirement.

Example 7

Suppose that n11 is equal to 43, pressure N intake water is 10 m and the nominal frequency n of rotation of the fan is equal to 140 rpm, then D1 is equal 0,969 m, and one blade with curved shape is designed in the form shown in figure 3 and 4. Indeed the measured rotation speed of the set of fan blades is equal to 120 rpm, which does not meet the design requirement.

For specialists in the art will understand that the wooden template can be obtained very simply by appealing to the respect of all parameters between the blades and the impeller, as well as to the relationship between the diameter of the edge of the water inlet of each blade and the present rotational speed, and between the water column and the frequency of rotation of the fan blades, and, therefore, can be obtained perfect design through the development after the immediate or small finishing wooden template.

Missing parts are the same as in the prior art or can be met through borrowings prior art.

1. The impeller is directly connected low-speed small hydro diagonal type used in hydrodynamic energy-saving cooling tower containing the upper crown (1), the lower ring (3) and the blade (2) with a curved surface, set the s between the upper crown (1) and lower ring (3), moreover, the edge (4) of the water inlet is located at one end of each blade (2) with a curved surface, and each edge (4) of the water inlet is a party to the high pressure impeller and also side of the radial inflow of the stream of water, and the edge (5) release of water is located at the other end of each blade (2) with a curved surface, and each edge of the water output is the low-pressure side of the impeller and also a party to the axial outflow of water flow; and a connection point between the edges (5) release of water and a lower ring (2) are A, a connection point between the edges (5) release of water and the top of the crown are B, characterized in that the ratio of the height h of the edge (4) of the water inlet of each blade (2) to the diameter D1 corresponding to the edge (4) water inlet is 0,18-0,22, the ratio of the total height H of the blades (2) to the diameter D1 is 0,35-0,42, the ratio of the diameter D2 corresponding to the point A of intersection of each edge (5) release of water and the lower ring (3), the diameter D1 is 0.4 to 0.6, the ratio of the diameter D3, corresponding to the point B of intersection of each edge (5) release of water and the top of the crown, the diameter D1 is 0.3-0.45, and the ratio of the diameter D4 in the position of discharge of water round the platform on the upper crown (1) to the diameter D1 of 0.1-0.2 and the ratio between the diameter D1 and the rotational speed of the blades of the cooling fan ismath display="block"> D1=n11H/n,moreover, D1 is the diameter corresponding to each edge (4) water inlet, a unit of diameter D1 is m, n11 is a constant and is called the given rotational speed, the specified value is in the range 28-42, n is the nominal rotational speed of the blades of the cooling fan unit rated rotational speed n is in rpm, H is the pressure of the inlet water, and the unit of the water column is m of the water column.

2. The impeller according to claim 1, characterized in that the number of blades (2) with a curved surface is 16-20, and the ratio of the minimum thickness to the maximum thickness of the pterygoid forms of the blades is of 0.28-0.34 in.



 

Same patents:

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: power industry.

SUBSTANCE: store of energy created with wind force includes sufficient amount of energy to meet the demands of the whole mankind. The invention represents effective device supplying this energy store for practical use. On rotating drive shaft 3 there installed is a pair of shaped parts 1, 2 of convex and concave profile, open V-shaped profile with rounded top, which reverses its orientation through 180 degrees, i.e. it is rotated from convex state to concave state. Drive shaft is rotated through 180 degrees. Circular movement of water, which takes place in the wave, effectively brings into operation such turbine, while the wave dies away. Pair of concave and convex shaped parts 1, 2 is spirally spread about drive shaft 3, by means of which the streams in all directions, which come into contact with pair of shaped parts, create the torque moment.

EFFECT: improving the use efficiency of streams and multidirectional oscillatory movements occurring in waves.

25 cl, 20 dwg

FIELD: power industry.

SUBSTANCE: hydraulic turbine of immersion type includes rotor 20, housing-stator that is integrated into rotor 20 and electricity generating means. Rotor 20 has outer rim 22 that encircles the blades 21. There is one or more floating chambers 60 located in outer rim.

EFFECT: rotor weight reduction for floating obtaining.

6 dwg

FIELD: machine building.

SUBSTANCE: invention refers to devices wherein flow of liquid rotates big rotor of screw type or rotor wheel having external circular rim positioned inside big circular case. A hydro-electric turbine consists of rotor 20 positioned inside case 30 with external circular rim 22 located in channel 32 made in case 30. The turbine is improved due to making at least one exit channel 50 for removal of foreign particles. Foreign objects caught between rotor 20 and case 30 are removed through exit channel 50.

EFFECT: avoiding or minimisation of foreign objects accumulation in channel of case.

6 cl, 4 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

Hydraulic turbine // 2369770

FIELD: power engineering.

SUBSTANCE: invention refers to hydraulic power engineering and can be used at hydraulic turbine plants; namely, in orthogonal-type hydraulic turbines with low heads. Hydraulic turbine consists of a wheel, a shaft, blades having aerodynamic profile, and traverses providing blades-to-shaft attachment. Blades are sectional and consist of pressure and back elements equipped with connection plates arranged between them and rigidly connected on one side to pressure element, and on the other side - to the back element of the blade. Pressure and back elements of the blade are made in the form of curved surfaces from sheet material of the same thickness. Section of the blade back element located close to the blade inlet edges is C-shaped and bent relative to the blade pressure element. Traverses rigidly connected to the shaft penetrate with the blades which are rigidly fixed on their ends.

EFFECT: invention is intended for increasing power, reliability of the design, decreasing material consumption, the manufacturing labour input and decreasing the cost owing to blades with aerodynamic profile being used.

3 dwg

Tubular impeller // 2345243

FIELD: engines and pumps.

SUBSTANCE: invention is related to hydropower engineering, namely to design of turbine impellers. Tubular impeller comprises blades and shaft with upper and lower bearing disks. Tubular blades bent in the shape of elbow are installed between disks. Outlets of tubular blades are oriented horizontally along tangents to circumference of lower disk. Blades are arranged in the form of pipe sections, inlet upper sections of which are installed vertically. All pressure flow passes only inside tubular blades, which excludes non-power flow of water passing through turbine, improves cavitation characteristic of turbine and flow laminarity. External surfaces of tubular blades and surfaces of other impeller parts remain dry, which reduces losses for friction.

EFFECT: higher efficiency of impeller.

1 dwg

FIELD: engines and pumps.

SUBSTANCE: centrifugal reaction impeller can be used in non-pressure devices, for example in centrifugal pumps and turbines. The impeller if made up of two plates with a circular belt rigidly fitted there between and furnished with closed discharge channels made therein. The aforesaid impeller is fitted on the shaft and has a hole to receive working medium. The discharge channels are arranged along the axial component perpendicular to the impeller radius, their outlets being directed towards the direction opposite to the impeller rotation. The impeller inner space features toroidal shape with a golden cross section.

EFFECT: reduced mechanical friction losses and higher efficiency.

3 dwg

Hydraulic unit // 2325549

FIELD: engines and pumps.

SUBSTANCE: hydraulic unit contains hydro generator, working blades rotating around a horizontal axis and having a shape formed with one parabola or with a cross of two parabolas, and a shaft running inside a bar to transfer a torque to the generator. The unit is equipped with a hollow drum with supports providing its floatation ability, and with a rotary table whereon the hydro generator is assembled. Also the hydro generator has inertial wheels with massive rims secured to both sides of the drum, and the second bar. The working blades are fastened flexibly with loops to the drum and pressed to the supports by flat springs. The shaft is made flexible and runs through both rods by means of which the axis of the unit is held and directed.

EFFECT: increased efficiency of a hydro unit.

1 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: 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

Hydraulic unit // 2325549

FIELD: engines and pumps.

SUBSTANCE: hydraulic unit contains hydro generator, working blades rotating around a horizontal axis and having a shape formed with one parabola or with a cross of two parabolas, and a shaft running inside a bar to transfer a torque to the generator. The unit is equipped with a hollow drum with supports providing its floatation ability, and with a rotary table whereon the hydro generator is assembled. Also the hydro generator has inertial wheels with massive rims secured to both sides of the drum, and the second bar. The working blades are fastened flexibly with loops to the drum and pressed to the supports by flat springs. The shaft is made flexible and runs through both rods by means of which the axis of the unit is held and directed.

EFFECT: increased efficiency of a hydro unit.

1 dwg

FIELD: engines and pumps.

SUBSTANCE: centrifugal reaction impeller can be used in non-pressure devices, for example in centrifugal pumps and turbines. The impeller if made up of two plates with a circular belt rigidly fitted there between and furnished with closed discharge channels made therein. The aforesaid impeller is fitted on the shaft and has a hole to receive working medium. The discharge channels are arranged along the axial component perpendicular to the impeller radius, their outlets being directed towards the direction opposite to the impeller rotation. The impeller inner space features toroidal shape with a golden cross section.

EFFECT: reduced mechanical friction losses and higher efficiency.

3 dwg

Tubular impeller // 2345243

FIELD: engines and pumps.

SUBSTANCE: invention is related to hydropower engineering, namely to design of turbine impellers. Tubular impeller comprises blades and shaft with upper and lower bearing disks. Tubular blades bent in the shape of elbow are installed between disks. Outlets of tubular blades are oriented horizontally along tangents to circumference of lower disk. Blades are arranged in the form of pipe sections, inlet upper sections of which are installed vertically. All pressure flow passes only inside tubular blades, which excludes non-power flow of water passing through turbine, improves cavitation characteristic of turbine and flow laminarity. External surfaces of tubular blades and surfaces of other impeller parts remain dry, which reduces losses for friction.

EFFECT: higher efficiency of impeller.

1 dwg

Hydraulic turbine // 2369770

FIELD: power engineering.

SUBSTANCE: invention refers to hydraulic power engineering and can be used at hydraulic turbine plants; namely, in orthogonal-type hydraulic turbines with low heads. Hydraulic turbine consists of a wheel, a shaft, blades having aerodynamic profile, and traverses providing blades-to-shaft attachment. Blades are sectional and consist of pressure and back elements equipped with connection plates arranged between them and rigidly connected on one side to pressure element, and on the other side - to the back element of the blade. Pressure and back elements of the blade are made in the form of curved surfaces from sheet material of the same thickness. Section of the blade back element located close to the blade inlet edges is C-shaped and bent relative to the blade pressure element. Traverses rigidly connected to the shaft penetrate with the blades which are rigidly fixed on their ends.

EFFECT: invention is intended for increasing power, reliability of the design, decreasing material consumption, the manufacturing labour input and decreasing the cost owing to blades with aerodynamic profile being used.

3 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: invention refers to devices wherein flow of liquid rotates big rotor of screw type or rotor wheel having external circular rim positioned inside big circular case. A hydro-electric turbine consists of rotor 20 positioned inside case 30 with external circular rim 22 located in channel 32 made in case 30. The turbine is improved due to making at least one exit channel 50 for removal of foreign particles. Foreign objects caught between rotor 20 and case 30 are removed through exit channel 50.

EFFECT: avoiding or minimisation of foreign objects accumulation in channel of case.

6 cl, 4 dwg

FIELD: power industry.

SUBSTANCE: hydraulic turbine of immersion type includes rotor 20, housing-stator that is integrated into rotor 20 and electricity generating means. Rotor 20 has outer rim 22 that encircles the blades 21. There is one or more floating chambers 60 located in outer rim.

EFFECT: rotor weight reduction for floating obtaining.

6 dwg

FIELD: power industry.

SUBSTANCE: store of energy created with wind force includes sufficient amount of energy to meet the demands of the whole mankind. The invention represents effective device supplying this energy store for practical use. On rotating drive shaft 3 there installed is a pair of shaped parts 1, 2 of convex and concave profile, open V-shaped profile with rounded top, which reverses its orientation through 180 degrees, i.e. it is rotated from convex state to concave state. Drive shaft is rotated through 180 degrees. Circular movement of water, which takes place in the wave, effectively brings into operation such turbine, while the wave dies away. Pair of concave and convex shaped parts 1, 2 is spirally spread about drive shaft 3, by means of which the streams in all directions, which come into contact with pair of shaped parts, create the torque moment.

EFFECT: improving the use efficiency of streams and multidirectional oscillatory movements occurring in waves.

25 cl, 20 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

Up!