DE1088658B - Blade attachment for axial flow machines - Google Patents

Description

GERMAN

The invention relates to a blade attachment in axial flow machines, in which the thread provided blade shaft with a sleeve provided with a nut thread to prevent accidental Loosely secured, rotatably mounted unit in the blade carrier is connected.

Such a type of fastening has already been proposed for blades of axial flow machines. However, these blades can only be adjusted at a standstill and can be opened after they have been installed can no longer easily be removed from the runner.

The object of the invention is in axial flow machines, especially with a blading, whose Angular position is jointly adjustable, easy interchangeability of individual blades without time-consuming and to achieve expensive dismantling of the machine.

In the case of high-speed gyroscopes, this is a proposal that does not belong to the state of the art suggested the cast hollow blades with stiffening ribs running in the longitudinal direction of the blades to provide, these stiffening ribs form a channel which, for example, to Receipt or guidance of fasteners or solvents for the blades or provided for this purpose Tools.

A starting point is provided by such a channel running in the longitudinal direction of the blades created to solve the problem of a fastener for these blades that a allows individual damaged blades to be exchanged quickly without having to remove the machine rotor to have to expand.

To solve the said problem, a blade attachment of the type mentioned at the beginning proposed according to the invention that the sleeve has a transverse groove, the sleeve bore two preferably around 90 °, the sleeve bore two continuous longitudinal grooves preferably offset by 90 °, the Blade shaft has a central bore and this has a polygonal recess and that one in the Shaft bore arranged locking member in a known manner by the pressure of a helical spring with its cross bar located at one end in the transverse grooves and with its located at the other end Polygon engages in the recess, the locking member by means of a through the hollow or blade provided with a bore through from the outside introduced tool from the Cross groove can be pressed and rotated.

The invention shown in the drawing as an exemplary embodiment is explained in more detail below, where in

Shovel attachment
in axial flow machines

Applicant:

Demag Aktiengesellschaft,
Duisburg, Wolfgang-Reuter-Platz

Dipl.-Ing. Walter «Encke and Dipl.-Ing. Josef Grimme,

Duisburg,
have been named as inventors

Fig. 1 is a view of the blade and its attachment in longitudinal section, in

Fig. 2 shows a cross section through the adjustment sleeve.

The ribs 7 and 8 running in the longitudinal axis of the airfoil 1 form a channel 6 through introduced a tool for fastening the blades or for loosening the fastening device can be.

Here, the locking member accessible through the channel 6 is removed with a screwdriver-like tool 4 with its cross bar 4 a against the pressure of a spring 3 from the transverse groove 5 α of the adjusting sleeve 5 pushed out so that the shovel can be screwed out of the now no longer engaged sleeve can.

The locking member 4 can be rotated relative to the shaft 2, since the square 4 b has entered the widened bore 2a from the angular recess 2δ. After the shovel is unscrewed by a few gears while constantly holding down the locking member 4 or the square 4 &, the locking member 4 is rotated by 90 ° with the screwdriver blade by engaging the contactor protruding into the channel 6, so that it is with its cross bolt 4 a can enter the longitudinal grooves 5 b of the sleeve 5. With the square 4 & still held down, the shovel can then be screwed out completely, the locking member 4 sliding outward in the grooves 5b.

The adjustment device for the blades, not shown, engages the rotatable sleeve 5.

Claims (1)

PATENT CLAIM: Blade fastening in axial flow machines, in which the threaded blade ^; ■ '- - 009 590/337 Shank is connected to a sleeve provided with a nut thread to form a unit secured against unintentional loosening and rotatably mounted in the blade carrier, characterized in that the sleeve (S) has a transverse groove (5 a), the sleeve bore two continuous longitudinal grooves (preferably offset by 90 °) ( 5 b), the blade shaft (2) has a central bore (2a). And this has a polygonal recess (2 &) and that a locking member (4) arranged in the shaft bore (2α) in a known manner by the pressure of a helical spring (3) with his am one end located cross bar (4 a) engages in the transverse groove (5 a) and with its polygon (4 &) located at the other end in the recess (2 b) , the locking member (4) by means of a through the hollow or with a Bore (6) provided blade (1) can be pressed and rotated through tool introduced from the outside out of the transverse groove (5 α). Considered publications:
German Patent No. 916 865;
Swiss Patent No. 218 966. 1 sheet of drawings © 009 590/337 8.60