US838358A

US838358A - Shroud member for blades.

Info

Publication number: US838358A
Application number: US33822206A
Authority: US
Inventors: Max Rotter
Original assignee: Allis Chalmers Corp
Current assignee: Allis Chalmers Corp
Priority date: 1906-10-10
Filing date: 1906-10-10
Publication date: 1906-12-11
Anticipated expiration: 1923-12-11

Description

PATENTED 1130. 11, 1906.

M. ROTTER SHROUD MEMBER FQR BLADES. APPLICATION IILED 0UT.10. 190s.

INVENTOR I ATTORNEY.

\yW nNEssm-a Uni-re s'ra rns ATENT FFTCE.

MAX ROTTER, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS-CHAL- MERS COMPANY, OF MILWAUKEE, l/VISOONSIN, A CORPORATION OF NEWV JERSEY.

SHROUD MEMBER FOR BLADES.

Specification of Letters Patent.

Patented Dec. 11, 1906.

Application filed October 10,1906. Serial No. 338,222.

To all whom it may concern:

Be it known that 1, MAX Ror'rnn, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented a certain new and useful Shroud Member for Blades, of which the following is a specification.

This invention relates to fluid-actuated or fluid-forcing mechanism, and specifically to a structure of shroud member for blades which prevents the operating fluid or the fluid operated upon from flowing by the ends of said blades when said blades are contained within a conduit or casing.

On the drawings which accompany and form a part of this specification, and on which the same reference characters are used to indicate the same elements wherever they appear in each of the several views, Figure 1 represents in perspective a series of blades of a steam-turbine, as an example, with this specific shroud member secured thereto, the blades being disposed within a casing, a fragment of which is shown. Fig. 2 represents in elevation a portion of a blade with the shroud member attached thereto and the easing in section. Fig. 3 represents the preferred construction of the shroud member.

On the drawings the reference character 1 represents a shaft upon which is mounted a blade-carrying member 2, to which are secured the blades 3, each of the blades, as shown, being provided with a projection 4 on its outer end, which is adapted to pass through a slot in the shroud member 5 and be riveted thereon.

Reference character 6 represents a casing or conduit within which the shaft, blades, and shroud member are situated.

The fluid is assumed to flow in the direction indicated by the arrows, and so far as this specific construction is concerned it is immaterial whether the blades are to be acted upon by any form of gaseous fluid, such as steam, or by a liquid, such as water.

This invention is specially adapted to be used in connection with steam-turbines, and when used in connection with a turbine of any form whatever to which it is applicable it is immaterial whether the shroud member be attached to movable blades or to the easing adjacent to said movable blades or to the usual series of fixed or guide blades, such as are used in the Parsons type of steam-turbine.

The shroud member 5 is approximately U- shaped in cross-section, with the concavity facing the flowing fluid. In the specific structure as shown by the drawings it is preferred to form this shroud member 5 as seen in cross-section, with a flat portion 7, which is adapted to be secured to the ends of the blades, a substantially semicircular portion 8, the diameter of the circle-of which this is a part being less than the distance between the end of the blade and the casing, and this semicircular portion terminated by the substantially radially extended portion 9,which almost contacts with the casing.

In Fig. 3 is shown a shroud member similar to the one already described, except that the complete shroud member as a whole is composed of a plurality of separate sections, each of which is in cross-section a duplicate of the others, this construction permitting relative displacement as between different parts of the shroud.

The operation of the device is as follows: An operating fluid, for example, flowing in the direction indicated by the arrow on Fig. 1 of the drawings and passing between the blades turns the blades, blade-carrying member, shroud, and shaft 1 within the casing 6. The fluid entering the U-shaped portion of the shroud member will force the part 9 of said shroud member outwardly toward the casing, as clearly shown by Fig. 2 of the drawings, thereby diminishing the space between said shroud member and the casing, thus preventing the fluid from flowing by the wheel of blades between it and the casingv The shroud member 5 is composed of a materialas brass, for example-which possesses the requisite strength and resiliency.

It is immaterial whether the flat portion 7 of the shroud member be attached to the blades or to the casing. It is preferred, how ever, to attach it to the blades, for the reason that it simplifies the construction and can be used for spacing and uniting the free ends of the blades.

hat I claim is 1. The combination in a fluid apparatus with the blades and an adjacent member of a resilient shroud member concave in crosssection located between said blades and said ICC adjacent member with the concave portion open in the direction in which the pressure of the fluid in the apparatus is the greater.

2 The combination in a fluid apparatus with the blades and an adjacent member of a resilient shroud member concave in crosssection located between said blades and said adjacent member with the concave portion open in the direction in which the pressure of the fluid in the apparatus is the greater, said shroud member being secured to the ends of the blades.

3. The combination in a fluid apparatus with the blades and an adjacent member of a resilient shroud member concave in crosssection located between said blades and said adjacent member with the concave portion open in the direction in which the pressure of the fluid in the apparatus is the greater, said shroud memberbeingsecured to the ends of the blades and provided with a radially-extended portion.

4. The combination in a fluid apparatus with the blades and an adjacent member of a resilient shroud member concave in crosssection located between said blades and said adjacent member with the concave portion.

open in the direction in which the pressure of the fluid in the apparatus is the greater, said shroud member being secured to the ends of the blades and provided with a radially-extended portion, said shroud member being composed of a plurality of separate sections.

In testimony whereof I affix my signature in the presence of two witnesses.

MAX ROTTER.