Impeller hydraulic machines

 

(57) Abstract:

The inventive tapered channels (K) 5 blades (L) 2 impeller axial hydraulic machines are located in several rows along the lines equidistant peripheral edge L 2, in a staggered manner and directed toward the low pressure at different angles to the peripheral edge. The angle of the channels of the first row is 0, the second is 15, the third is 30. The step between the rows To 5 and the peripheral edge is equal to (0.01-0.02)D1. Steps To 5 of the first row is equal to: from input edges 0.01 D1between the subsequent 5: to the axis of rotation L of 2 - (0.05-0.1)D1and from the axis of rotation L of 2 - (0.10-0.2)D1. The 5 steps To the second and third rows are shifted by 1/3 compared to the first series and each other. Location 5 is selected so as to focus the combination of them coming out of the jets at one point near the peripheral edge L 2. This arrangement should ensure the greatest impact of the jets on the decrease in the intensity of destruction L 2 and the chamber of the impeller due to slot cavitation between them. 3 Il.

The invention relates to hydromelioration and can be used in impellers of hydraulic machines.

The purpose of the invention is the reduction in the intensity of the ruin is Fig.1 shows the impeller of the axial hydraulic machines; in Fig.2 is a view of the impeller in plan; Fig.3 - view channels three series combined in one plane.

The impeller of the axial hydraulic machine includes a housing 1, a fixed therein, the blade 2. The wheel is mounted in the chamber 3.

In the area of the peripheral edge 4 of the blade 2 are channels 5, which are made sloping, converging from the working surfaces 6 to the back surface 7 of the blade 2 with an angle of taper 13-14aboutand a diameter of dothe outlet channels 5 on the back surface 6, is equal to (0,143-0,167)h dodo(0.25 to 0,286)h, where h is the thickness of the blade 2 at the location of the channel 5.

Channels located in the vicinity of the peripheral edge of the blade in several rows equidistant the edge and each other in a staggered manner and are directed at different angles in the direction of the camera 3 impeller hydraulic machines: the angle of the channels: the first row is 0aboutsecond , 15aboutthird - 30about; step between the rows of channels and the peripheral edge is equal to (0,01-0,02)D1the steps of the channels of the first row is equal to: from input edge - 0,01 D1between subsequent channels to the axis of rotation of the blade - (0.05 and 0.1)D1and from this axis (0,1-0,2)D1; the steps of the channels of the second and third row smashin with high speed fan-shaped spiral is injected from a region of high pressure on the working surfaces 6 in the area of low pressure on the rear surfaces 7 on the front peripheral edge and the chamber surface of the impeller in the area, which brings slit cavitation.

As a result of intensive exposure to jets of fluid flow in the low pressure area is a redistribution of the latter, change the conditions for the development of cavitation and reduce its devastating effects on the back surface 7 of the blade 2 and the surface of the chamber of the impeller.

The IMPELLER of the HYDRAULIC machine, comprising blades with tapered channels, converging to the back sides of the blades and along the line equidistant peripheral edge of the blade, characterized in that, to reduce the intensity of the destruction of the blades and the camera impeller axial hydraulic machines due to slot cavitation between them, tapered channels are arranged in several rows along the lines equidistant peripheral edge of the blade in a checkerboard pattern, and directed toward the low pressure at different angles to the peripheral edge of: the angle of the channels of the first row is 0osecond , 15othird - 30ostep between the rows of channels and the peripheral edge is equal to (0,01 - 0,02)D1the steps of the channels of the first row is equal to: from input edge - 0,01 D1between subsequent channels to the axis of rotation of the blades - (0,05 - 0,1)D1

 

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