US1672721A - Elastic-fluid turbine - Google Patents

Description

June 5, 1928. O. JUNGGREN ELAS'IYIG'FLUID TURBINE Filed May 1927 Inventor": Qsccrr" Jumggre'n,

His Attorrga.

Patented June 5, 1928.

UNITED STATES PATENT OSCAR ."runeennn, COMPANY, or

OF SC I-IENECTADY. NEW YORK, ASSIGNOR TO GENERAL ELECTRIC SCHENECTADY, NEW YORK, A CORPORATION OF NEW YORK.

ELASTIC-FLUID TURBINE.

Application filed May 7,

The present invention relates to elasticfiuid turbines of the large'r type demanded by present-day power requirements. More particularly the present invention relates to the exhaust end structures of such turbines, which involve exhaust casings of extremely large size and associated parts of similar size intergral with or attached to the casings. In large casings and parts of this character, considerable coring or chambered construe-- tion in employed to reduce weight, particularl ther eof. While this construction'is both desirable and necessary in providing a satisfactory design, it adds to theproblem of providing for the uniform heating of the large mass of material in the exhaust end structure; r.

The corded or chambered portions of the mass tend to remain cool long after the main body has become hot. In a form of turbine, for example, in which large cored supporting feet for the exhaust casing and a large cored bearing pedestal adjacent the casing are provided, the feet and pedestal remain comparatively cool long after the casing has become hot. As a result there is consider able strain in the casing and between the hot and the cooler parts and in many cases sufficient deformation of the casing to throw the diaphragms out of line and to open cas ing joints at certain places.

It is the object of the present invention therefore to provide an improved exhaust casing arrangement for large elastic-fluid turbines which permits a cored or chambered construction in and adjacent to the exhaust casing without any of the accompanying disadvantages above mentioned.

As an example of a specific embodiment of the invention, the exhaust end structure of a common form of elastic-fluid turbine is illustrated in the accompanying drawing, and for a consideration of what is believed to be novel and the invention, attention is directed thereto, and to the accompanying description and appended claims.

In the drawing, Fig. 1 is a plan view of an elastic-fluid turbine exhaust end structure embodying the invention; Fig. 2 is a sectional view ofthe same taken on line 2-2, Fig. 1, and Fig. 3 is a detail view in section taken on line 3-3, Fig. 1.

Referring to the drawing, 5 is the foundation on which the exhaust casing 6 rests.

in the base and supporting portions 1927. Serial No. 189,525.

ing and are shown as being integral with the casing. The bearing pedestal may be, and often is, separable from the casing; In any case its location is substantially as shown. In this location it is, together with the cored supporting feet for the casing and other cored portions thereof, subjected to heating from the casingr 1 As pointed out hereinbefore such cored or chambered parts in and adjacent the cars ing are the, source of strains and distortion. Such parts are, however, desirable and neces sary in providing a well designed casing construction of the larger type. In accordance with the invention, however, the apparent disadvantage of location of such parts is turned to advantage as will be seen from the following. I

Since casing structures and like parts are castings, all cored or chambered parts must necessarily have an opening for removing the core material. In large turbines the cored parts adjacent the casing may then be cored to open into the latter. The opening serves to place each chamber from which the core was removed in communication with the interior of casing from which it then receives heating fluid and offers no greater impedance to heat flow than the remainder of the casing. Hence the difiiculty in the way of using cored or chambered parts in the exhaust end structure is overcome as the same may in accordance with the invention be used as required and may with advantage be placed adjacent or in the casing. The core removal opening then serves to form the heating connection automatically. Such connection may, however, be made by other means where the cored or chambered part is sufiiciently separated or distant from the exhaust casing to prevent coring directly into it.

' In the present example the cored or. cham- (1h am bered parts are so located that direct connection may be made with the exhaust casing by the core openings which are inclicated at 13 and 14:. With the arrangement shown the core openings are made directly in the walls of the exhaust hood. Such openings may be provided in the walls in any other suitable manner. With the arrangement shown, communication with the exhaust casing interior is established with out additional work after casting.

It has been found that by permitting heating fluid to circulate in the chambered parts connected with the exhaust hood the casing heats up and cools down uniformly, thereby avoiding great strains in the metal and helping to maintain alignment in the working parts of the turbine.

The simple cored construction shown and described is only. by way of example as representing any cored or otherwise chambered exhaust end structure which in accordance with good design may be desired.

It will be seen that with the construction in accordance with the invention the location of cored or chambered parts close to or in the exhaust casing is entirely permissible and advantageous since by turning the core openings onto the exhaust casing instead of elsewhere a direct heating connection is made with said casing.

What I claim as new and desire to secure by Letters Patent "01 the United States, is

1. In an exhaust end structure for an elastic-fluid turbine, a cast exhaust casing, and cast walls integral with said casing providing chambers adjacent the casing wall, said casing wall being provided with core removal openings for said chambers which provide direct communication between the latter and the interior of theexhaust casing.

2. In a casting for an exhaust end-structure for an elastic-fluid turbine, integral cast walls forming an exhaust casing and cored chambers adjacent thereto, one of said walls being common to the cored chambers and to the exhaust casing, said wall having core removal openings therethrough--providing direct communication between the interior of the exhaust casing and the cored chambers.

3. In an elastic-fluid turbine, the combination with a casing through which elastic fluid flows, of a cored chambered structure integral with said casing, one wall of said structure being formed by the casing and the latter having core removal openings pro-' viding direct communication between the interior thereof and the interior of the chambered structure, whereby elastic fluid is supplied from the casing to the interior of said chambered structure.

In witness whereof, I have hereunto set my hand this 5th day of May, 1927. I

OSCAR JUNGGRENQ

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