Attaching means for nozzles.

Application filed February 21,1914. Serial No. 820,327.

To all whom it may concern:

Be it known that I, Walter Kieser, a citizen of the Swiss Republic, residing at Charlottenburg, Germany, have invented 5 certain netv and useful Improvements in Attaching Means for Nozzles, of which the following is a specification.

My invention relates to turbines and particularly to nozzles and to the means for at10 taching them to their holders.

In manufacturing turbines it is desirable for various reasons to construct the nozzles from a material different from that of which the holder is constructed. In arrangements 15 as heretofore used, however, this has often led to warping and deformation due to difference in the coefficients of expansion of the respective members, the nozzles, in general. having a higher factor of expansion 20 than that of the holder. This trouble has been experienced particularly where nozzle holders having undercut annular slots for the reception of the nozzles have been used.

The object of the present invention is to 25 provide an attaching means of the type referred to whereby I avoid any possibility of deformation occurring due to the different coefficients of expansion of the materials used in constructing the respective,parts.

Referring to the drawing wherein I have illustrated a form which my invention may take, Figure 1 represents a longitudinal section through a fragment of a turbine, and Fig. 2 is a development on lines 2—2 of 35 Fig. 1.

Located in operative relation to the bucket wheel 1 carrying the rows of buckets 2 is shown a nozzle holder 3 to which are attached nozzles 4 after the improved man⁴⁰ ner of my invention. The nozzle holder is provided' with suitable passages 5 for the flow of motive fluid and with the undercut annular groove 6 which has one surface, as surface 7. ground to form a true seat.

⁴⁵ The nozzle 4 is formed with the flange 9 and fits into the groove 6, the flange extending into the undercut portion thereof. As best shown in Fig. 1, the nozzle 4 is of lesser dimension than the groove so as to slide ⁵⁰ loosely therein and is formed with a ground packing surface which fits against the ground surface 7 of the groove to form a tight packing. The flange 9 is of materially less thickness in an axial direction than the ⁸⁵ axial depth of the undercut portion of the groove and in order to hold the packing surface of the nozzle on to the surface 7 I provide suitable members as shown at 10. These members are preferably formed of a slightly yielding material and may take the form of 50 wedges or other desired shapes. Usually they will be longer than the flanged portion of each individual nozzle section. For guiding and centering the nozzle with relation to its holder suitable projections or lips may 85 be formed on one of such members for cooperating with the other member.

In the drawing I have shown the base of the groove G as formed with a second annular groove 11, in contact with the sides of 70 which are the flanges or lips 12 carried by the nozzles, which flanges are formed of less axial depth than is the groove 11. I desire to have it understood, however, that my invention is by no means limited to this ar- 75 rangement as various other arrangements may be used.

By my invention it will be clear that the nozzles may expand to a greater or less extent quite independently of the holder there- ⁸⁰by avoiding any possible deformation due to the unequal expansion of the nozzles and holder.

In accordance with the provisions of the patent statutes. I have described the prin- ⁸⁵ciple of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; but I desire to have it understood that the apparatus shown is only illustrative, and that ⁸⁰the invention can be carried out by other means.