DE1476755B2 - Cooled blade - Google Patents

Description

At the root end of the shovel skirt 13, an edge surface W is provided, which likewise has no outlet openings.

Corresponding to the arrangement of the webs 11 on the inner blade body 10, surface strips S connecting the edge surfaces K and W are provided in the shovel skirt 13 and are excluded from the introduction of outlet openings.

The remaining area of the shovel skirt 13 is provided with smaller passage openings, for example, with a diameter of 0.040 mm. This remaining area then has a permeability of 15%.

Due to the distribution of larger, medium and smaller passage openings in the Shovel skirt 13 does not occur at this different operating temperatures, since the coolant throughput by the specified distribution of the outlet openings on the locally to be discharged

ίο the amount of heat is coordinated.

1 sheet of drawings

Claims (1)

1 2 unwound jacket body of the shovel shirt a patent claim: to let it work. This allows the production the shovel shirts are automated and the Cooled rotor blade, particularly cheaper for internal assembly of the rotor blade power turbines where coolant is shown at 5. fel root in channels of a blade inner body An embodiment of the invention is in the fol- enters and explained in more detail by means of outlet openings on the basis of the drawing. It The shovel pointing to the surface of the airfoil arrives, and at which the temperature differences F i g. 1 shows a side view of a rotor blade, on the airfoil surface by one of these io F i g. 2 shows a cross section through the rotor blade Arrangement taking into account temperature distribution according to line H-II of FIG. 1, tion and / or design of the outlet opening F i g. 3 shows a development of the shovel shirt conditions in the blade herid are essentially balanced- Fig. 1. are characterized in that the inner vane body 10 is solid and has that the shovel skirt (13) has a jacket body 15 on its circumference web-like ribs 11, between bathes from sheet metal, in which the discharge openings run which channels 12 for the coolant, openings for the coolant are introduced. The inner vane body 10 is made of a vane 'shirt 13, the body of which is made of metal ■ · - - '■■■■■ · ■ sheet metal rests against the ribs 11 and is fixed with them -: 20 is connected. At one end the eye . '"" felinnenkörperlO ^ a blade head 14 on which the shovel skirt 13 rests in a sealing manner. The shovel The invention relates to a cooled running shirt 13 is connected to the side surface 15 of the shovel, especially for internal combustion turbines, with head 14 also firmly connected, so that the Kühlder Coolant at the blade root in channels of a 25 central channels 12 against the blade head 14 pressure-tight Vane inner body enters and are sealed by Ausittsöff-. At its surface facing away from the blade head 14, and at the lower temperature end, the inner blade body 10 protrudes a bit from the surface of the airfoil through an arrangement that takes this temperature distribution into account ° Way a blade root 16 for fastening the opening and / or formation of the outlet openings in the rotor blade on its associated turbine rotor. The scoop shirt are essentially balanced. When the rotor blade is inserted into the turbine rotor, such a cooled rotor blade is out of the set, the root ends 17 of the Ka-USA. Patent 3,067,982 known. There are 12 inlet openings for the coolant,
Known rotor blades, the shovel skirt is made of 35. For the coolant to exit from the porous metal mesh, onto which an additional material is shovel, the shovel skirt 13 is sprayed with an outlet opening in order to provide the permeability of the thread. The in Fig. 3 in developed besides for the "coolant according to the temperature shape shown the shovel skirt 13 has a central distribution on the blade surface to be changed locally, dash-dotted outlined area A. Such blades with metal 4 °, within which larger through-holes, weave cause high material costs and are, for example, with a diameter of 0.065 mm, which is difficult to manufacture. The spraying-on of additional shovel skin is incorporated. The object is to provide a free passage cross-section for a rotor blade of 45. The type mentioned at the beginning of the discharge opening is to be improved in such a way that openings themselves are, as a result of the selected drawing, an elaborate production of the blade skirt to scale for the shown Aus Leadership example one is avoided. blade according to the invention in the drawing For this purpose, the illustration provided according to the invention is omitted. see that the shovel skirt forms a metal body of 5 ° in the circumferential direction of the shovel skirt 13 gren sheet metal, in which the outlet openings for zen are introduced at its surface area A two surface areas of coolant. before B , within which middle penetration hole -... One with. The features of the invention, for example with a diameter of 0.050 mm, in the guided rotor blade has considerable advantages. the shovel shirt are brought in. The high material costs for the metal mesh at 55 rich B then have, for example, a passage known rotor blades are saved. The serenity of 20%. Also the outlet openings in the position of the shovel skirt from a casing body in these areas of the shovel skirt 13 are not made of sheet metal, which is significantly cheaper than the manufacture shown. from an easily destructible fabric. The agile spraying of additional ^{metal onto} the middle surface area A is also avoided by two surfaces. In particular, the outlet openings C ₁ and C _{2 can be provided} , within which the blades for the coolant can be introduced into the blade skirt in a much simpler and more straightforward manner, likewise with central through-bores. The surface areas C ₁ and C _2, for example due to the effect of charge carriers, also have a permeability of 20.
shine. At the end of the shovel head-side end of the shovel electron beam according to a stored program of 13, an edge surface K is indicated with which the shovel shroud 13 welded to the shovel head 14 on the surface of the shovel blade - in accordance with the once determined temperature - on the and which is free from outlet openings.