COOLING CHANNEL MADE IN WALL Russian patent published in 2013 - IPC F01D5/08 

FIELD: machine building.

SUBSTANCE: element of the wall, in which at least one cooling channel is made, has internal surface and external surface, which can be cooled with cold gas circulating in the channel. The channel includes one drilled hole and one diffusion part. The drilled hole opens on one side on the level of internal surface, and on the other side to the diffusion part so that a hole is formed. The diffusion part enlarges around the hole, at that being a restricted wall of the bottom and the side edge. The bottom wall has the first flat part, into which the drilled hole opens, and the second flat part located before the first flat part in the direction of cold gas flow. The above first and second flat parts are inclined deep into the wall so that in the middle plane of diffusion part with drilling axis (AP), the first angle ("в") measured between tangent (T) to external surface, at intersection point (O) of external surface and the second flat part, and the first flat part, and the second angle ("б") measured between the above tangent T and the second flat part are such that the first angle "в" directed from the above tangent T to the above first flat part is algebraically smaller than the second angle "б" directed positively from the above tangent T in the direction to the above second flat part, and so that the value of angle ("г") between the second flat part (2) and the first flat part (1), which is measured in the above middle plane (M), is in the range (at absolute value) between 130° and 170°.

EFFECT: increasing mechanical resistance of the wall to cyclic loads at maintaining geometry of the diffusion part.

9 cl, 7 dwg