US1392098A - Boiler-feeding injector - Google Patents

Description

B. T. W ILLISTON. BOILER FEEDING INJECTOR. APPLICATION FILED AUG I2 1919 cal-ly 4 3 1 fim 4 SHEETSSHEET 2- ptvzz 1921.

7 20620607 Eel?) 572, ZUZZZcIStOiZ B. T. WILLISTON.

BOILER FEEDING INJEGTQR. APPLICATION FILED AUG. 12, 19I9- Patented Sept. 27,

4- SHEETS SHEET 3.

Zz'stan WWUXM B. T. WILLISTON.

BOILER FEEDING INJECTOR.

APPucnion FILED AUG.12, 1919.

Patented Sept. 27, 1921..

4 SHEETS-SHEET 4.

a a I ww/ W hr UNITED STATES PATENT OFFICE.

MAXWELL AND MOORE, INC OF NEW JERSEY.

BELVIN 'r. WILLIs'roN, 0F SOMERVILLE, MASSACHUSETTS, AssrGNoR T0 MANNING Yon-K, N. Y AGORP R IQN on (NEW BOILER-FEEDING INJECTOR. I

Specification of Letters Patent. Patented Sept. 27, 1921.

Application" filed August 12, 1919. Serial No. 317,023.

To all to 7mmit 'may concern Be it known that I, BELvIN T. lVILLIsToN, citizen of the United States of America,and resident of Somervizlle, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in BoilerFeeding Injectors, of which the fol lowing is a specification.

My invention relates to injectors and more particularly to boiler feeding injectors of the type used on locomotives.

In boiler feeding and other injectors it has been customary to provide a plurality of valves to control the forcer nozzle, the lifter nozzle, the water inlet, the over flow, etc, and to regulate the flow of waterthrough the injector by operating a plurality'of these valves conjunctively. This practice has involved more or less complicated mechanisms and more or less inconvenience and diff culty in controlling the action of the injectors. An object of the present invention is to simplify the construction of injectors, to reduce the number of valves and other parts and, to correlate the various parts so that the flow of water may be regulated from maximum to minimum by means of a single valve. 1 j

Moreover,in injectors which are subjected to low temperatures, as e. g. are locomotive injectors in cold weather, it is necessary to heat the water standing in- ,the water supply hose or pipev leading to the injector when the injector is'not in use in order to prevent the water from freezing, and in thecase of locomotives it is. also-desirable to heat the water in the tender-in very cold weather. Another object. of the present invention, therefore. isto overcome the difliculties incident to injector systems, in which means is provided for heating the water in advance of the injector when the injector is idle, or which are provided withheating means of the unsatisfactory types heretofore proposed, and to provide improved means for accomplishing this purpose which, involves little if any additional mechanism and which may be controlled with ease and certainty. v I

Furthermore, in boiler feeding injectors and other injectors where the control levers or handles must necessarily be located at a considerable'distance from the valves which they control, (and in practically all injector Systems this distance must be more or l ss "seat-ed due to the unavoidable locomotive injectors.

considerable), there is a pronounced tendency'for the valves not to remain tightly lost motion in the trains of linkage connecting the control handles with the valves and also to the vibration which is particularly troublesome in In the case of thethe steam valve, and if desired other of the valves, tightly seated when the injector is idle notwithstanding lost motion in the control linkage and notwithstanding excessive vibration. r I

Otherobjects will be apparent from the concreteembodiment of the invention illustrated in the accompanying drawings in which 4 t r Figure 1 is a right side elevation showing parts broken away; a

Fig. 2 is a left side elevation showing parts broken away; l-

Fig. 3 i sa rear elevation on an enlarged scale of a portion'of the injector viewed fromthe right, of F ig. l, partsbeing sec tioned; and

Fig, 4: is a section on line 4-4 of Fig. 3;

Fig. 5 is a fragmentary cross section to enlarged scale illustrating the steam inlet valve. I l l I The particular embodiment of my invention chosen for the purpose of illustration comprises in general a main casing C, a water inlet nipple W, a steam inlet S, ia'delivery nippleD, and an overflow nipple 0. Within the casing C (Fig. 4) is provided a steam valve Vs, awater valve Vw, and intermediate overflow valve V0, a final overflowvalve V0", a forcer nozzleFN, a forcer tube FT, a lifter nozzle LN, a lifter tube LT, etc. An annunciator or tell-tale T of any suitable construction communicates with. the casing C at 26,. whereby when the injector breaks lsteam will issue therefrom to indicate thatfithe injector has ceased functioning, x 1 v a c The steam valve V3. is a double valve hav ,ing an upper portion 1 seating on a seat 2 per portion by a lost-motion connection comprising a pin 5 slidable in a spider 6 depending from the upper portion whereby the upper valve may be raised part way before the lower valve begins to open. The upper end of valve Vs is adapted to engage against face (Fig. 1) when the valve is opened for a purpose hereinafter described.

The upper valve 1 of the double steam valve V8 and its seat 2 are provided with telescoping portions which prevent steam from passing the valve until the valve has been opened a considerable amount; and in the specific embodiment of the invention illustrated in the drawings valve 1 is provided with a downwardly directed pistonlike extension 22 fitting fairly closelyinto the opening in the valve seat but having sufficient freedom in said opening to permit the bleeding of steam thereby. The piston 22 extends downwardly to the plane 23 and the spider 6 extends downwardly from the lower end of the piston to guide the valve and to support the lower valve 8. A groove 24 may be provided at the junction-of the spider with the piston; When the valve Vs is lifted a small and predetermined quantity of steam may bleed past the piston 22 until the latter is completely withdrawn from the opening in the valve seat 2. r

The water valve Vw is also a double valve comprising an upper portion 10 rotatably mounted by threads 11 and a lower portion 8 tQlGSCOPiHg into the upper portion with a sliding fit. The lower valve 8 has a flange seating on seat 9 and this flange has four openings 13 extending therethrough. 'The upper valve 10 has a flange seating on the flange of the lower portion 8 over the openings 13. The upper valve 10 is rotatably supported by threads 11 engaging an internally threaded holder, said threads having such a high pitch that the valve may be opened by a single turn of the rod 12. The lower valve 8 rises with the upper valve if the pressure beneath the valve is greater than above whereas if the pressure above is substantially greater than below the valve 8 remainsseated when the valve 10-is raised thereby uncovering openings '13. I 1 In a locomotive injector system the control handles are located in the caband conse quently the control handles Cs Cw and Co, for the steam, water and overflowuvalves respectively are connected to the respective valves through trainsof linkage. The handle Cs is connected 'to the steam valve Vs through the medium of a bowed rodfl l, a

member 15 and the rod 7 extending inside casing C. The member 15 i is pivotally mounted on the casing by means of side straps 16 pivoted at 16, Thehandle (3w is connected to the water valve through a series of shafts and universal joints 17 and 11". The handle C0 is connected to the final overflow valve V0 through a similar series of shafts and universal joints 18 and 18.

A feature of the invention consists in the combination of the bowed link 14 inthe linkage connecting the steam valve with its con trol handle. This bowed link is made of steel having sufficient resiliency to flex when the valve is pressed against its seat and to maintain the valve tightly seated notwithstanding lost motion in the linkage and notwithstanding heavy vibration. By using a bowed resilient rod in the control linkage the steam valve is maintained tightly seated without adding any parts, the bowed rod taking the place of the usual reach-rod. The bowed rod 14 also serves to take up the lost motion of the control linkage when the valve is open in the following manner. In fully opening the steam valve the handle Us is pulled over until the valve 1 seats upwardly against face 25 and until the bowedv rod 1 1 is sufiiciently stretched or straightened from normal curvature to hold the train of linkagetight.

The operation of the system is as follows: To set the injector in action the final over flow valve V0" is opened. the watervalve the pressure of the water, and thence to the final overflow V07. After the flow of water is thus established the steam valve Vs is further lifted until the lower valve 3' is opened, whereupon the flow of water is maintained by steam flowing through forcer nozzle FN, The final overflow valve V0 is then closed and the water'flows through the delivery passage D to the boiler, the in termediate overflow valve V0" being automatically closed and the check valve V 0 being automatically opened by the pressure of the water in the chamber surroundingthe forcer tube FT. After the injector has thus been set in action the rate of flow 'may be controlled merely by raising or loweringjthe its I follow the'upper valve for the reason that the steam pressure above the valve exceeds the water pressure below. The openings 13 are thereby uncovered permitting the steam to flow through valve 8 to heat thewater.

.By virtueof the construction of the steam valve and its control mechanism this valve is opened only a slight amount upon the movement of the control handle one full notch. measure at a pressure sufiicient to hold down valve 8 and warm' the water in advance of the water valve but insuflicient to actuate the annunciator or te ll-tale T. By virtue of the construction ofthe water valve and its control mechanism both, parts open together to supply water to the injector but only the upper part opens to supply-heating steam tothe feed water, the action of; the lower valve being automatic. And by Vll': tue'of the coordination oftlie steam and 'water valves, these valves function either to control the flow of water to the boiler or to control the flow of steam to the feed water, the valves being actuated by the same levers and in the same directions in each case. The unique arrangement of valves and control mechanism also makes it possible to throttle the flow of water solely by the steam valve, the valve commonly employed at the lifter nozzle being renderedwholly unnecessary and therefore being eliminated.

The opening of the steam valve such a small amount as to permit steam to flow in sufliciently small measure not to actuate the tell-tale annunciator is rendered possible by the piston 22 telescoping into valve seat 2.

I claim:

1. An injector device comprising a steam valve, a seat therefor, means for. lifting said valve from its seat to a predetermined amount, and means for permitting the passage of steam in minute quantities only through said valve when so raised.

2. An injector device comprising a'steam valve, an annular valve seat having a steam passage therethrough, means for lifting said valve from its seat. and means for obstructing the free flowv of steam through said passage during the first stages of opening movement of the valve.

. 3. An injector device comprising a steam valve, an annular seat therefor providing This permits steam to flow in small a cylindrical steam passagejand a cylindrical piston member secured to said valve and normally extending into and loosely fitting within said passage.

a spider extending downwardly from said piston, and means carried by said spider for supporting'the lower valve member.

5. An in ector devicehavingsteam and water inlet passages, a valve for controlling said steam inlet passage, a lever for actuatingsaid valve, and a notched locking sector forsaid lever, said valve comprising an extension member so constructed and arranged that upon moving said lever into engagementwith the first notch of said sector, steam will be permitted to bleed past said extension member in predetermined minute quantities. i

6. An injector device having a water inlet passage, an annular valve seat defining suchgpassage, a manually closable main valve member cooperable with said seat for obstructing the flow of water therethrough,

said valve member having an opening there through, and means engageable with said valve member for controlling the passage of water through said opening.

7. An injector device having a water inlet passage, an annular valve seat surrounding the same, a reciprocable main valve member cooperable with said seat, said valve member having an opening therethrough and being constructed and arranged to be lifted from said seat by the pressure of water within the inlet passage, and manually actuable means operable to close said opening'in the main valve and to hold the latter against its seat.

8. An injector device comprising a water inlet valve having a mainvalve member engageable with a valve seat, said valve member having a guide stem secured thereto, and means for forcing said main valve to its seat comprising a rotatable member having a socket for engagement with said guide stem.

9. An injector device comprising a water inlet valve having a valve seat, a main valve cooperating therewith, said valve having an opening therein, a guide stem projecting from said valve, a secondary valve for closing said opening and having a socket for loosely receiving said guide stem, and manually controllable means for actuating said secondary valve.

10. An injector device having steam and water controlling means, said latter means comprising an annular valve seat, a main valve disk cooperating therewith, said disk having a series of openings therethrough surrounding an upstanding guide stud, a secondary valve member having a socket loosely engaging said stud and a flange for covering saidropeni'ngs, said valve member beingexternally screw threaded for engage ment with an internally threaded holder, and means. for rotating said member relatively to its holder.

11. An injector apparatus comprising steam and water inlet valves, said water inlet valve comprising a plurality of members movable simultaneously in the same direction for admitting water, and means for moving one of said members independently of the other to permit the passageof steam therethrough.

12. An injector apparatus comprising a steam inlet passage, a water inlet passage, valves for controlling the flow of steam and water through the respective passages, and a lifter nozzle having a free and unobstructed and constantly open entrance.

13. An injector apparatus comprising steam and water controlling valves, an actuating lever for said steam valve, means for locking said lever in adjusted position, and connections between said lever and the steam valve comprising a reach rod having an interposed flexible portion oflaterally bowed form.

14. In a boiler feeding injector, the combination with a system of steam and water control, of a steam supply closure valve and linkage for actuating same, and a stop arranged to engage said valve when open, said linkage including a bowed flexible rod adapted to maintain said linkage tight when the valve is either opened or closed.

15. An injector device comprising a steam inlet valve, lifter and forcer nozzles, a pressure controlled water inlet valve, a telltale, and lever means for controlling said inlet valve, said steam inlet valve being so constructed and arranged that a predetermined movement of said lever means serves to admit steam to the injector in sufiicient amount to hold said water inlet valve upon its seat but in insufficient amount to actuate the telltale.

16. An injector device comprising a steam inlet valve,a manually operable lever for actuating same, lifter and forcer nozzles, a telltale,-and a pressure operated water inlet valve comprising a disk having perforations therein, said steam valve being so constructed and arranged that upon a definite movement of the lever, steam will be admitted for warming the water in the supply pipe but in insufficient quantity to actuate the telltale.

Signed by me at Boston, Massachusetts, this 5th day of August, 1919.

v BELVIN T. WILLISTON;

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