US1718388A - Balanced multiple throttle - Google Patents

Description

June 25, 1929. B MITH 1,718,388

BALANCED MULTIPLE THROTTLE Filed April 18, 1927 2 Sheets-Sheet 1 R INVENTOR.

- BY Q A TTORNE Y.

June25, 1929. B ITH 1,718,388

BALANCED MULTIPLE THROTTLE Filed April 18, 1927 2 Sheets-Sheet 2 Ezrf' Sm rf L,

, INVENTOR.

I k BY @/,%;Q

A TTORNE Y.

Patented June 25, 1929.

UNITED STATES PATENT OFFICE.

BERT SMITH, F PASSAIC, NEW JERSEY, ASSIGNOR TO AMERICAN THROTTLE COM- PANY ING., OF NEW YORK, N. Y.

BALANCED MULTIPLE THROTTLE.

Application filed April 18, 1927. Serial No. 184,714.

The invention relates to locomotives and more particularly to throttles of the so-called multiple type used in connection with them.

Throttles of this multiple type are most conveniently housed in the same casting with the superheater header. The general arrangement of such a combination header and throttle housing is shown in United States Patent Reissue 16,285 to Ray M. Brown. Im-

proved forms which provide means to balance the throttles are claimed in Bay M. Browns United States application, Serial No. 24,802, filed April 21, 1925, and in United States application 153,329, filed by Neal T. McKee on December 8, 1926. The present invention constitutes an improved form of structures such as shown in said patent and applications.

A very important factor in arrangements of this type is that of keeping the total dis tance from front to rear as small as possible. This is necessitated by the limited space available between the front tube sheet of a locomotive and the stack. Headers of the so-called T bolt type are readily kept within the small limits at the designers disposal but when it is desired to utilize the so-called through-bolt header with its numerous advantages the space limitations offer serious difiiculties. The improved form of the Brown application referred to above keeps the dimension re ferred' to within the desirable small limits, but a disadvantage is entailed because of the difliculty of machining the top of the header. The form of the Brown application referred to can be utilized in certain cases, but only if the space between the front. fiue sheet and stack is fairly large.

It is the purpose of the present invention to which the length from front to back is kept small. The header at the same time is of such form that all the parts that have to be machined are readily accessible for this purpose.

Other and more detailed objects of the invention will appear in the course of the following description. p

The invention is illustrated in the drawings accompanying the present specification. In these drawings Fig. 1 shows a top view, the right half of it being in section, of a combined header and throttle according to my invention. Fig. 2 shows a fragmentary front view,

5 the left portion being in'section on line 22 provide a novel arrangement of the combined superheater header and throttle housing in of Fig. 1. Fig. 3 shows a sectional view on line 33 of Fig. 1. Fig. 4 shows a section of header of a different form embodying my invention.

The general arrangement is as will be clear from what has been said above similar to that used heretofore. The boiler sheet is shown at 1, the front flue sheet at 2, and the fines at 3.- Into these fiues 3 extend the superheater ments 4 by which it is delivered in a superheated state to the fingers or sub-headers 99 intermeshed in the usual way with the first named series of sub-headers 8. From the sub-headers 9 the steam is to be delivered to the two steam pipes 1010 but such flow is'to be controlled by the multiple throttles. These multiple throttles are shown at 11.

They consist each of a disc-shaped valve proper 12 from which extends downwardly a stem 13 carrying a cylindrical piston 14. From this piston there extends downwardly a projection 15 while from the disc valve 12 extends upwardly a guide rod 16. The disc valves 12 control openings in the horizontal partition 17 while the pistons 14 reciprocate in the cylindricalapertures 18 in a partition 19. The partitions 1.7 and 19 divide the valve housing into an upper space 20, a middle space 21 and a lower space 22. The steam pipes 10 communicate by means of the connections 23 with the middle space 21.

This general arrangement of the valve housing is not novel, but is similar to that of the McKee application referred to above.

My invention is concerned more particularly with means for carrying the steam from the fingers or sub-headers 9 to the upper space 20. I provide for this purpose a passage 24 which extends forward under the lower chamber or space 22 and up in front of this same space and in front of the middle space 21 opening into the upper space 20. This nections' 23 extend through it as Fig. lclearly illustrates. The overall dimension from the front flue heeta to -the flanges 25-25 is not increased by'the presence of the upward part of the passage 24.v When this passage is introduced atztherear of chamber 21- as has been the custom heretofore, chamber 21 is thrown forward so far that the base 4001 the smoke stack 41 interferes-with access to the chamber. explained more fully below.

The throttles are actuated in the usual manner by means of therotatable rod 26 and the fingers 27 secured to it; these fingers coming into contact with the lower ends of the extensions 15. The purpose of the pistons 14 is,

as will be apparent to those familiar with this art, to balance the-throttles so that they may be readily opened. When these throttles are closed, steam from dry pipe 6 flowing through the header and superheater units reaches the upper space 20 and holds the throttles down. In order to balance them steam must be admitted to the lower space 22. This is effected by means of the small balancing or pilot valve 28 which is opened in advance of all the other valves When itis lifted from itsseat, steam from'the upper space 20 flows directly into the lower space 22. The other valves can then be easily raised from their seats.

The extensions 16 on the valves extend into guideways 29 in the caps 30. These caps close openings 31 in the top wall of the throttle housing. Through these openings 31 the valves are readily accessible for insertion, removal, honing, etc. The fit between the extension 16 and the. walls of the cylindrical space 29 is a loose one so that the space 29 is filled with steam under boiler pressure, and the steam escaping slowly through the loose fit acts as a cushion preventing a sudden upward movement of the valves when they first open.

Access to the superheater header and in particular to the caps is provided through the opening 43 cut in the smoke-box sheet 42 and normally closed by the cover 44. It will be seen from Fig. 3 that by my arrangement the chamber 21 and throttles 11 lie clear of the stack base, and access can therefore be readily gained for the purpose of inserting, grinding and removing the valves, which is possible only with difficulty in the former arrangement where the passage 24 is to the rear 2 of chamber 21 and the latter therefore lies in superheaters. The bolt-heads are inserted in longitudinal slots in the header base in the manner well known to those familiar with this art, and do not extend clear through the superheater header. The top of the header This is very objectionable, as-

need, therefore, not be machined, and does not need to be accessible. This makes it possible to locate the entire throttle housing directly over the fingers 8 and 9. This will be clear from an inspection of Fig. 4. The fingers 9 deliver their steam directly to the upward riser 24 which delivers it to the upper space 20 just as in the principal form first described. By locating the riser 24 at the front, the dimension from the tube sheet to the flanges 25 is here also kept at a minimum,

and the throttle chamber likewise lies back second transverse chamberparallel to the first; an apertured partition dividing it into upper and lower spaces; valves controlling said apertures; means to conduct steam from the space below the partition; a smoke-stack base above and forward of the second transverse chamber; and a passage around the front of the second chamber connecting the second set of fingers to the space above the partition, whereby the second transverse chamber lies entirely out of line with the smoke-stack base.

2. In apparatus of the class described, the combination of a locomotive smoke-box; a superheater header in its upper part; said header having a chamber extending transversely across the smoke-box; means to deliver saturated steam from the boiler to said chamber; a series of alined spaced forwardly extending hollow fingers communicating with said chamber; a second set of fingers in the spaces between the first; a plurality of superheater elements connecting the two sets; a second transverse chamber parallel to the first; an apertured partition dividing it into upper and lower spaces; valves controlling said apertures; two forwardly extending steam pipe connections to conduct steam from the space below the partition; and a passage including a portion between said steam pipe valves having heads controlling said ports and pistons reciprocating in said cylinders; manually operable means to actuate said valves; means to admit balancing steam into said bottom space; two forwardly extending steam pipe connections from the intermediate space; and a passage extending up in front of the second chamber connecting the second set of fingers to the top space.

BERT SMITH.

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