US833720A - Injector. - Google Patents

Description

PATENTED OCT. 16, 1906.

' s. L. KNEASS.

INJECTOR.

APPLICATION FILED NOV.18.1904.

M 2 nvvmro/e Tu: NORRIS PETERS co., wAsHmaroN, n. c.

' STRICK-LAND. L. KNEASS, OF PHILADELPHIA, PENNSYLVANIA.

I -IN.JECTOR.

Specification of Letters Patent.

Patented Oct. 16, 1906.

Application filed No e be 18,1904. Serial No. 233,364.

To all whom it may concern.-

Be it known that I, STRICKLAND L. KNEASS, of the city and county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements-in Injectors, of which the following is a s ecification.

My. inventionis applic-ab e to all classes of injectors which have a forcing combiningtube provided with one or more openings inclosed in an overflow-chamber having an outlet torthe air which is closed by a gravity overflow-valve during the operation of the injector, and especially to that class known as restarting. It is of especial advantage in such injectors to have an unobstructed. outlet for the waste steam when the watersupply is cut off, so that the pressure within the overflow-chamber shall not cause a backflow of steam :in the water-supply pipe. Further, all injectors which contaln an'overflow-chamber controlledby a gravity checkvalve require the overflow-valve to be tightly closed to permit-the use of a higher temperature of water-supply than the overflowing temperature or to compel the passage of steam into the suction-pipe when it is desired to use the injector as a heater. If the injector isplaced on-a locomotive below the level of the bottom of the tender-tank, it isespe' cially advantageous thatthe shaft for closing the overflow-valve shall be approximately vertical, so that it can be easily connected to an operating-handle in the cab within convenient reach of the engineer, or if my invention is ap lied to a lifting-injector the oper-' ating-sha t may have a rod-and-universaljoint extension terminating close to the starting-valve.

Itis an object of my invention, therefore, to obtain a short and direct passage-way from the overflow-chamber of an injector to the air.

It is a further object to control the outlet from the overflow-chamber of an injector by a swing check-valve and to close it by means of a shaft extending upward approximately vertically.

It is a further object to obviate the side thrust upon the hinge and fulcrum of a swing overflow check-valve when the valve is closed by the pressure of a cam ap roximately horizontal, and finally to ho d by gravity the closing-cam in its open position.

To these ends my invention COIlSlStS'iI1' i11- closing a swing check-valve in a waste-pipe, whichv gives a free and direct outlet from'the movement of the swing c overflow-chamber of the injector and :closing the valve by means of a cam.

It further consists in providing guides on the inside of the waste-pi 'e to prevent lateral eck-valve upon its seat.

It further consists in closing the said valve by means of a cam operated bya shaft, and finally in a gravity-stop for said cam to hold it in its open position.

In the drawings which accompany and form part of this specification, Figure 1 is a sectional view of my improved swing overflow check-valve and waste-pipe with the valve open and a part section of an injector having a combining-tube provided with an %pening inclosed in an overflow-chamber.

ig; 2 is an outside end view of the same with part of the front wall of the waste-pipe removed. Fig. 3 is a art-sectional view of the overflow-valve an waste-pipe with the swing check-valve forcibly closed by the cam F. 'Fig. 4 is a horizontalsection of same, and Figs. 5 and 6 plan and side enlarged views of the'cam F.

A is the overflow-chamber of an injector, containing an opening a'between the combining and the delivery tubes.

B' is a waste-pipe containing the swing overflow check-valve C, suspended by the hinge D from the fulcrum E.

F is the closing-cam operated by the approximately vertical shaft G and resting upon lug b of the waste-pipe B. The upper bearing of the shaft G is in the lug '12.. Between the lugs 11 and b there is a space to allow for vertical movement of the cam F when the inclined lane f slides over the upper surface of the ug b.

d d, Fig. 4, are guides on the inside of the wasteipe B to prevent lateral movement of the va ve C when the cam F is moved to the closing osition.

g is a ug on the under side of the cam Fto prevent rotation ofthe cam-shaft beyond the position for the maximum opening of valve O.

The operation of my improved swing o verflow check-valve and Waste-pipe is as follows: When the water and steam supply valves are closed, the valve C isheld against its seat by gravity; 'but when the injector is feeding the boiler with cold water with the proper adjustment of the water and steam supply there is a partial vacuum in the overflow-chamber which holds it to its seat. If the water or steam supply 18 temporarily interrupted, the

pressure of the fluid in the chamber A forces open the valve C to the pos1tion shown in Fig. 1, giving a free and direct outlet from the overflow-chamber to the air. If it isdesued to forcibly close the swing check-valve C, either to prevent outflo w of water or steam or to compel the passage of steam through the connecting-pipe into the supply-tank, the shaft G is rotated, bringing the cam F in contact with the rear of the overflow-valve C, forcing the valve to its seat. This motion causes the inclined plane f on the lower face of the cam F to slide upon the boss (1, raising the cam and the operating-shaft. Then the injector is to be placed in normal condition to be started or to restart automatically, the operating-shaft G is rotated in the opposite direction until the boss 9 of the cam F strikes against the boss I) of the waste-pipe B. The cam F, sliding downward on the inclined planef, remains in its lowest position at the extremity of the partial revolution, held by the combined weight of the cam F, shaft G, and operating-handles, preventing the accidental closing of the valve by the vibration of the locomotive to which the injector may be attached. I/Vhen the cam is rotated to its closing position, the side pressure of rotation upon the swing overflow check-valve tends to slide it upon its seat and to bend the hinge D and the fulcrum E, Which would produce improper alinement of the valve and its parts, with its seat upon the body, permit an indraft of air, and interfere with the proper action of the injector. I therefore provide the guides d (1 upon the inside walls of the waste pipe B, which receive the lateral thrust of the cam and pre vent side motion of the swing check-valve C The usual method of sealing the outlet of the overflow-chamber of an injector consists in the use of a vertical gravity check-valve with a horizontal seat. When required to be tightly closed, it is forced upon its seat by a vertical screw operated from the cab of a locomotive, whether the injector is used in a lifting or non-lifting position, or, if the overflow-valve is placed horizontally, so as to use a vertical seat, a spring must be used to hold it in its normally closed position; but owing to the temperature of the steam and for mechanical reasons this arrangement is obviously unsatisfactory. When the gravity overflow-valve is vertical, the preliminary discharge-conduit from the overflow-chamber to the waste-pipe must be curved upward to obtain a horizontal seat for the gravity check-valve, suflicient area must be pro vided within the wastepipe for radial outflow from under the lifted va ve, and an additional conduit made for conducting the waste water and steam downward to the outlet to the air. My invention permits the use of a simple rightangled waste-pipe pointing downward in the desired direction, and the flow of water and steam from the overflow-chamber is direct and unimpeded. The swing check-valve acts as a deflector for directing the outflowing fluids to the opening of the waste-pipe without passing through the tortuous passages required when the gravity overflow checkvalve rests upon a horizontal seat. Also the application of a horizontal cam to a swing gravity check-valve permits the use of a vertical shaft to close the valve and seal the outlet of the overflow-chamber, the operating-handles being within convenient position even when the injector is placed below the running-board of a locomotive. the use of a gravity-stop for the position of the closing-cam and operating-shaft, which permits the full opening of the swing gravity overflow check-valve, renders the invention safe to use even when the injector is not within convenient reach or view of the operator, for if the position of the closing device should change and hold the valve firmly against its seat without the knowledge of the engineer the accidental interruption of the action of the injector might cause damage to the crown-sheet of the boiler, due to insuflicient amount of water, or heat the watersupply in the tank beyond the limiting temperature of the injector.

I do not limit myself to the use of an inclined plane upon the cam F (shown in enlarged view in Figs. 5 and 6,) as the same result may be obtained by inclining the upper face of the lug b and providing a suitable projection upon the cam F, or the gravity-stop may be attached to the handle or operatingshaft, nor do I claim a swing gravity overflow-valve.

What I claim and desire to secure by Letters Patent is 1. In an injector, an overflow-chamber, in combination with a waste-pi e, an outwardly-opening swing check-Va ve with side guides and an oscillating closing-cam.

2. In an injector, an overflow-chamber, in combination with a waste-pipe, an outwardly-opening swing check-valve, a cam independent of the valve, adapted in its movement, to close the valve, and means to limit the valve-releasing movement of said cam.

3. In an injector, an overflow-chamber, in combination with a waste-pipe, an outwardly-ope'ning swing check-valve, a rotary cam, independent of the valve, adapted, in its movement, to close the valve, and means to limit the valve-releasing movement of said cam.

4. In an injector, an overflow-chamber, in

combination with a waste-pipe, an outwardly-opening swing check-valve and a closing-cam having an operating-face, of variable height.

5. In an injector, an overflow-chamber, in combination with a waste-pipe, an outwardly-opening swing check-valve and a Also I ICC closing-cam having an operating-face of greater height than the face of the valve operated on. I

6. In an injector, an overflow-chamber, in combination with a waste-pipe, an outwardly-opening swing check-valve and a closing-cam having an operatin -face, one portion of which is of greater heigIit than the face of the valve operated on, the remainder of the cam being of decreasing height.

7. In an injector, an overflow-chamber, in combination with a waste-pipe, an outwardly-opening swing check-valve and a closing-cam having an operating-face, one portion of which is of less height than the face of the valve operated on, another portion of which is of greater height than the face of the valve operated on, the intermediate portion being of gradually-increasing height.

8. In an injector, an overflow-chamber, in'

combination with a waste-pipe, an outwardly-opening swing check-valve and a closing-cam having a helical operative face.

9. In an injector, an overflow, tion with a Wastepipe, an outwardly-opening check-valve, tically-movable shaft supporting said cam, said cam having an incline plane on its lower face, and. a fixed boss adapted to coact with said plane.

10. In an injector, an overflow, in combination with a wastepipe, an outwardlyopening check-valve, a rotary closingcam, a

in combinaa rotary closing-cam, a ver- 7 wardly-opening swing vertically-movable shaft supporting said cam, said cam having an incline plane on its lower face and a fixed boss adapted to coact with said plane, said-cam having a lug adapted to strike said boss.

11. In an injector, an overflow, in combination with a waste-pipe, an outwardlyopening check-valve, a rotary and verticallymovable cam, and means to cause said cam to move u ward in one direction of movement and ownward in the other direction of movement.

12. In an injector, an overflow, in combination with a waste-pipe, an outwardlyopenin check-valve, a rotary and verticallymovab e cam, means to cause said cam to move upward in one direction of movement and downward in the other direction of movement, and means to limit the rotary movement of the cam in the direction to open.

13. In an injector, in combination with an overflow-chamber, a waste-pipe, an outcheck-valve and a closing-cam with a gravity-stop.

14. In an injector, an overflow-chamber, in combination with a waste-pipe, an outwardly-opening swing check-valve with side guides, and a closing-cam with a gravitysto P STRIOKLAND L. KNEASS. Witnesses:

JOHN L. PHILLIPs, E. R. HARPER.

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