US1771195A - Throttle - Google Patents

Description

J. k. SCOTT July 22, 1930.

THROTTLE Filed July 12', 1928 4 Sheets-Sheet 1 I N VEN TOR.

A TTORNEY.

J y 1930. J. K. scoTT 1,771,195

THROTTLE Filed July 12, 1928 4 Sheets-Sheet 2 W James 62v ff INVENTOR.

A TTORNE Y.

y 22, 1930- I J. K. sco-r'r 1,771,195

THROTTLE Filed-July 12, 1928 4 Sheets-Sheet '3 amar f Lieu/7" INVENTOR'.

A TTORNE Y.

J. K. SCOTT Jul zz, 1930.

THROTTLE Filed July 12, 1928 4 Sheets-Sheet 4 Patented July 22, 1930 N TED STATES PAT-ear] OFFICE JAMES E: .SQQITE; 9! EA?! ORAN NEW J BSEY; AS IGNQB T TEBQTILE QQJY ZANX LNQ, 9 Y .BK,, L .-v

- rnnorrnn Application filed July 12,

ofthepresen inv ntionis to pr ide an pro ed means or balancing h individual valves so tha they an be readi y open d,

'16 at he same time leaving th m unbalanced when they are closed so that they remain tight on heir seats- 7 r 1 The inventi n illust t d he tour shoo s-of dr ing h e ith inhich Fig- 1 1. is a longi udina entral ection f he front part of a locomotive with my in ention appl ed; F g, Qis a compos te vi the ft ha f be ng a front ele n f he appa tus illustra ed in Fig.- 1, Wh le, he right h l 'i 2 aseotiona vie online 2:2 of Fig, 1.; Fig- 3 ssn en arged longitudinal sectional ew of ueof the alvos Fig- 4; is a top view of F ghport onsof the smoke box and b i h l as ell as some o er p r ions b g bro n 5.0 away for t e sake ofci earuess; .F g- 5 is a iew simila o Fig,- :3, illust ating amo ifi cation, and 6 a fragmenta y secti nal view on line 6-:6 of Fig- The line heet of the boiler is sho n a M he.flues;2 2 extending backward from it. 3

the boiler sheet hile 4 is t e sm e-b x sheet. The stack is nd c te a 5,. T e dry pipe appears-at 6 hi e the st am p pes can seenat 7= The superhea er e m 8-8 xtendin t e o dinary Way nto the l nes 2 2 and have their ends connected to the header 9. This header has a transverse chamher 9", with which the forwardly extending f ngers 9 communicate, and a second trans verse chamber 12, with which the fingers 1 which are intermeshed' with'the lingers 9", communicate. Steam is delivered by the dry pipe 6'to the chamber 9 of the header 9, flows-from this chamber into the fingers 9 to and superh aterelements 8, is returned by 1928. SerialNo. 294,476. 7

themin a superheated stateto the fingers 14iand space 12 of header 9, whence it flows through the pipes 7 to the steam chestof the locomotive. All of this is of the ordinary con, struction.

In the'patent referred to above, the flow of the steam from the header is controlled by a transversely arranged series of relatively small throttles. This same general arrange: ment is shown in the present case; The throttles are shown at- 10 1(); They engage seats in the partition 11 whichseparates the space 12 from the space 13. Space 12 is in direct communication with the fingers '14 of the header-into which the steam flows on leaving the superheater elements; while 13 is in direct communication with the steam pipes: 7 by means of the connections 15. VVVhen all the throttles 10:40 are closed the steam flow from the boiler to thesteam pipe 7'is there fore cut off.

The throttles are actuated by means of a transversely arranged shaft 16 which bears arms 17 each of which engage a stemr18 of a throttle. By this arrangement the throttles can be opened in any sequence desired, the arms '17 and the relative length of stems 18 being arranged so that the former come into contact with the lower ends of the latter in the desired sequence.

If no meansare provided for at least par: tially balancing these valves, it will be rather diliicult to open them even if they are made quite small.

moval of the valves and for grinding the valve seats. The seatsa-re preferably separate rings 11 pressed into the openings in partition 13. They are preferably equipped with spiders 11 carrying guides 26, through which the stems 18 extend.

My invention is concerned with a novel a One of the valves, which is given the special reference numeral 10 and which is illustrated on an enlarged scale in Fig. 3, is provided with a small pilot valve 23 and is of special construction for this purpose. It has no continuous stem 18 like the other valves. There is instead a separate cylindrical piece 24: which reciprocates in the guide 26 of the spider 11 and has a shoulder 25 limiting its downward movement. hen the valve 10 is seated and the shoulder 25 is in engagement with the upper side of guide 26, there is a space 27 between the upper end of the piece 24 and the lower face of the valve 10'. The stem 28 of the pilot valve extends axially through the valve 10 and the piece 24. Its lower end extends below the lower end of the piece 24 when the head 29 of the pilot valve is seated on its seat 80 in the upper face of the valve 10*. A plurality of passages 31 extend from the space 32 below the head of the pilot valve to the lower face of valve 10 thus putting the cylindrical space 20 into communication with the space 13 when the pilot valve is raised off its seat.

All of the spaces 20 in the caps 21 are put into communication with each other by means of a manifold 33, whose several outlets register with holes in the caps 21.

The operation of the device will now be readily understood. hen all of the throttles are closed and the fingers 17 all out of contact with the valve stems, steam that has leaked past the cylindrical portions 19 into the spaces 20 causes these valves to be seated firmly on their seats. IVhen the engineer now makes the first movement in opening the throttle, the arm 17 under the stem 28 of the pilot valve is the first to come into action. It raises the pilot valve 29 off its seat 30, thereby putting all of the spaces 20 into communication with the space 13 through the manifold 33 and the channels 31. The steam in the spaces 20 and in the manifold therefore promptly escapes and the valves are now substantially balanced. A further movement of the rod 16 in a counter-clockwise direction as viewed in the drawings raises the throttles 10, the order of opening being in accordance with the relative spacing of the arms 17 from the stems 18.

When the throttles are to be closed, a clockwise movement of the shaft 16 as viewed in Figs. 1 and 3 permits the throttles to come down successively on their seats. After the last one is seated a further movement permits the pilot valve to become seated and thereupon leakage past the cylindrical portions of the valves 10 will again build up pressure in the spaces 20 and in the manifold 33.

It will be seen that by the above arrangement I have provided a very simple and effective means for balancing all of the valves in such a multiple system. The modification according to Figs. 5 and 6 consists essentially in substituting a cored channel or passage 33 for the manifold 38, branches 83* extending from this passage through the caps 21 to the spaces 20 inside of the caps. This channel with its branches provides communication betweenthe several caps in the same way as the manifold in the form first described. Exceptfor this change the second form is exactly like the first and its action. will be obvious. This form is preferable to the one first described inasmuch as access to the caps is not blocked. Moreover, in practice it is rather difiicult to make tight joints simultaneou sly between all the branches of the manifold of the first form and the several caps.

I claim:

1. In apparatus of the class described, the combination of an elongated chamber; a longitudinal partition dividing it into two spaces and provided with an alined series of apertures; aseries of removable caps in the outer wall of one of the spaces, each having a cylindrical hollow portion alined with one of said aperatures; a series of valves each adapted to close one of said apertures and having a cylindrical portion reciprocating in one of said hollows of the caps; a duct placing all of the hollow cap spaces into communication with each other; and means comprising arelatively small pilot valve to release pressure from the cap hollows. I

2. In apparatus of the class described, the combination of an elongated chamber, a longitudinal partition dividing it into two spaces and provided with an alined series of apertures; a series of removable caps in the outer wall of one of the spaces, each having a cylindrical hollow portion alined with one of said apertures; a series of valves each adapted to close one of said apertures and having a cylindrical portion reciprocating in one of said hollows of the caps; a duct having a plurality of branches, each branch opening into one of the cylindrical hollow spaces; and a relatively small pilot valve which, when opened, puts the cap hollows and the second space into communication.

3. In apparatus of the class described, the combination of an elongated horizontal chamber, a partition dividing it into upper and lower spaces; said partition being provided with a series of alined apertures; a series of removable caps in the outer wall above the apertures each having a hollow cylindrical interior alined with an aperture; a series of valves each adapted to close one of said apertures and having a cylindrical portion reciprocating in the associated hollow cap; there being a channel in the wall of said chamber adjacent to said caps, with branches extending to the interiors of the caps; and a pilot valve associated with one of said valves which when opened puts the corresponding cap hollow, and through the said channel and branches all the other cap hollows, into communication with the lower space.

4. In apparatus of the class described, the combination of an elongated horizontal chamber; a partition dividing it into upper and lower spaces; said partition being provided with a series of alined apertures; a series of removable caps in the outer wall above the apertures each having a hollow cylindrical interior alined with an aperture; a series of valves each adapted to close one of said apertures and having a cylindrical portion reciprocating in the associated hollow cap; there being a channel in the walliof said chamber adjacent to said caps, with branches extending to the interiors of the caps a downwardly extending portion associated with each valve; operating means to open said valves by acting on said portions, the arrangement being such that some of the valves open later than others; one of said valves having a passage from its upper to its lower side; a pilot valve controlling said passage; and means to open said pilot valve before any i of the other valves are opened.

JAMES K. SCOTT.

Images