DE105073C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

CLASS 4-7: Machine elements.

Fast rotating disc.

Patented in the German Empire on November 18, 1898.

The invention relates to the construction of fast rotating discs; it is supposed to be achieved thereby that when such disks jump as a result of their being exceeded by their Solidity allowed speed to be torn off only relatively small pieces and be thrown away, which cannot endanger the environment.

In the rapidly rotating disks of the steam turbines, e.g. B. from a massive Center piece with blades attached to the periphery, attempts have been made to to achieve this effect by moving the disc from the center towards the rings located on the periphery and necessary for fastening the blades produced decreasing in thickness. In experiments made with such discs, However, it has been found that due to the uneven material properties of the In the case of such disks, breakage does not always take place directly within the above-mentioned ring and so not only does this rip itself loose, but also larger pieces of the disk themselves are carried away, which in one case is even dangerous for the turbine housing became.

In the construction of rapidly rotating disks, which is the subject of the invention the intended effect is now achieved by adding to the circumference of such disks along with the cast piece not yet existing weaknesses through suitable processing, Screwing in grooves, making drill holes and the like in such a way that the permissible stress always comes first in this weakened zone be exceeded and so the break must take place here, if from any the permitted speed should be exceeded for any unforeseen cause. Then only the outer ring, located outside of the weakened areas mentioned, becomes the Disc torn off while the middle piece remains intact, respectively. larger pieces of it cannot be demolished.

This construction is on one of the turbine disks mentioned above on the accompanying drawing in two different versions

shown. It shows:

Fig. Ι a part of such a disk in Supervision and

Fig. 2 is a section of the same, while the

3 and 4 show corresponding representations of the second embodiment.

In both designs, the disk consists of a center piece α , which gradually decreases in thickness from the center towards the circumference, and a ring b attached to it, to which the turbine blades c are fastened.

In order to achieve the intended effect, holes d are drilled inside the ring nest and along it in the middle piece a at suitable distances from one another, which weaken the connection between middle piece and ring so that here if the permissible speed is exceeded

the rupture must take place, so that only the ring b wears off, without taking along larger pieces of a .

In the second embodiment (FIGS. 3 and 4) the same is achieved in that annular grooves e are screwed into the center piece a along both sides of the ring b.

This construction can of course not only be used for steam turbine disks, but can be used for almost all fast rotating discs.

It is essential that such disks pass through at a suitable distance from the circumference appropriate removal of material made such weakening of the strength of the disc becomes, that here the event. Break must take place and only the one lying outside Part of the disc can be torn away.

Claims (1)

Patent claim: Fast rotating disc, characterized in that it is close to its circumference by suitable processing (screwing in grooves, channels, making drill holes etc.) is so weakened that when the permissible speed is exceeded the breakage of the disc at the weakened point must take place and so only ' the part of the disc lying outside this point can wear off. 1 sheet of drawings.