Hydraulic turbine

FIELD: hydraulic engineering.

SUBSTANCE: invention is designed for converting kinetic energy of water flow of small rivers and tides. Proposed hydraulic turbine has housing and wheel with helical blade provided with flange in form of cylindrical spiral secured on blade for changing outreach of flange.

EFFECT: increased transmission of flow to wheel, reduced losses for friction against stationary housing, increased efficiency of turbine.

2 dwg

 

The invention relates to energy and can be used for selection of energy flow of small rivers and tides.

Known turbine, comprising a housing and a wheel with a screw blade (screw wheel) - see A.S. SU 1020619 F 03 B 13/12 on the Device to use the energy of the sea tides".

By its characteristics and the achieved result the turbine closest to the proposed and adopted for the prototype.

The disadvantage of such turbines is low efficiency due to a significant loss of flow energy due to braking his peripheral part of the casing of the turbine.

The objective of the invention is to increase the efficiency.

To solve this problem improved turbine, comprising a housing and a wheel with a spiral blade.

The improvement consists in that the screw blade is made in the form of a G-shaped profile; in the embodiment, the screw turbine blade made adjustable departure shelf D-shaped profile.

The implementation of the helical blade in the form of a G-shaped profile increases the area of contact of the thread with a screw blade through her shelves and accordingly reduces the area of contact of the thread with the casing of the turbine, which increases the transfer of energy flow to the wheel and reduces the loss of energy of the flow to the friction of the fixed housing and those who amym increases the turbine efficiency.

The implementation of the helical blade with adjustable flight shelf D-shaped profile provides adjustment of the turbine efficiency change of departure shelves.

Below, with reference to the accompanying drawings, a description of the proposed turbines, which shows:

figure 1 - turbine in longitudinal section;

figure 2 - turbine with adjustable flight shelves helical blade.

In figure 2 the arrow shows the direction of movement of the shelves helical blade when adjusting departure; dash-dotted line shows the position of the shelf with a maximum departure.

The proposed turbine includes a housing 1 and the wheel 2 with a screw blade 3. The screw blade 3 is made in the form of a G-shaped profile with shelf 4.

In the embodiment of the turbine (Figure 2) screw blade 3 is made with shelf 5 in the form of a separate cylindrical spiral connected with the other part of the screw blade 3 by screws 6 with the option to change departure And 5 shelves.

When the water flow is directed by the socket 7 of the housing 1 along the turbine and, acting on the screw blade 3 shelf with 4 (5), causes the rotation of the wheel, which is transmitted to the generator (not shown) (this is due to the shelf increases the impact energy of the flow on the wheel and decrease the contact and unproductive losses of energy caused by deceleration of the flow about the body between the coils is INTOSAI blades).

Change of departure shelves 5 allows you to adjust the effect of flow on the impeller 2.

Turbine according to the invention (due to the increased influence of the flow on the impeller and the reduction of friction losses on housing has increased the efficiency.

Turbine, comprising a housing and a wheel with a spiral blade, wherein the blade is made with a shelf in the form of a cylindrical spiral, fixed blades with the option to change departure shelves.



 

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