US2012348A - Injector - Google Patents

Description

INJECTOR Filed Jan. 1l, 1935 3 Sheets-Sheet l l. P, PEDRICK 2,912,348

INJECTOR 5 Sheets-Sheet 2 Filed Jan. ll, 1955 l. P. PEDRICK Aug. 27, 1935.

INJECTOR Filed Jan. ll, 1933 3 Sheets-Sheet 5 mm1 I muuu fre/zee, D. Pea/rz'c/ Patented Aug. 27, 1935 UNITED STATES PATENT OFFICE William Sellers & Company,

Incorporated,

Philadelphia, Pa., a corporation of Pennsylvania` Application January l1, 1933 Serial No. 651,075 10 Claims. (Cl. 103-265) This invention relates to an improvement in injectors such as are used for supplying feed Water to steam boilers, as, for example, on locomotives.

This invention will be applicable to injectors ofvarious types placed either above or below the water supply.

More particularly, this invention relates toan improvement on injectors of the type disclosed in the United States patent to Strickland L. Kneass, No. 1,069,883, dated August 12, 1913; and has for its object more particularly the provision of an injector of the type disclosed by said patent and which will be of increased efficiency and accuracy in service. l

` The injector disclosed by the Kneass patent referred to, and more particularly described with reference to a non-lifting type injector, or one placed below the level of the water supply, comprises the usual water and steam valves, steam nozzle and forcing tubes, the steam and water valves being connected through a lever or yoke to a single operating lever by the manipulation of which the injector may be started and stopped with greater ease and efciency than in the case of prior injectors where separate manipulation of thewater and steam valves was required.

More particularly in the Kneass injector referred to the water and steam valves being under pressure respectively of water and steam were so? connected to the lever that in its initial' movement the water valve opened, with admission of water to the injector, while the steam valve, maintained closed under the steam pressure acting thereon, was opened in the continued movement of the manipulating lever.

The Kneass injector, while an advance in the art, has not proved entirely satisfactory due to the fact that on cracking of the steam valve with consequent admission of high pressure steam thereunder, the valve under the influence of the steam pressure, opens faster than the manipulating lever will be normally moved, with the result that the water valve, initially opened, will shut with consequent cutting oli of the supply of Water. Hence, in the operation of the Kneass injector great care is required to insure against closing of the water valve due to uncontrolled opening ofthe steam valve after its initial opening, and even where care is exercised, diiculty is encountered in starting the injector.

Now, it is the object of this invention to provide an injector of the type indicated, which will be capable of easy and efficient starting by manipu- -lation of a single levezI and which, at the same time, will be accurate and free from the disadvantage pointed out with reference to the injector of the Kneass patent.

Having `now indicated, in a general Way, the nature and purpose of this invention, I will 5 proceed to a detailed description thereof with reference tol the accompanying drawings which illustrate a preferred embodiment and in which:

Figure l is a view, largely in section, of an injector embodying this invention. i l0 Figure 2 is a side view showing a manipulating leverand connections to the water and steam valves of the injector shown in Figure l.

Figures 3, 4 and 5 are views showing details of construction taken on their respectively num- 15 bered section lines on Fig. 1.

Referring to the several figures a is the body or casing of the injector, b is the steam inlet and c the water inlet, d and e are steam nozzles and f indicates the forcing tubes. g is the outlet to 20 the boiler feed line, h a line check valve and i an overflow outlet from the 'forcing tubes controlled by an' overflow valve i.

The admission of'water to the injector is controlled by a water inlet valve k, the stem Z of 25 which extendsthrough a cylinder m, closed at its bottom by a plug 1t, through which the stem passes with a loose t, and through a stuffing box o at the top of the cylinder, to pivotal connection with one end of a crosshead or yoke p. 30 Mounted on the stem l Within the cylinder m is a piston q positioned so as to be adjacent the lower end of the'cylinder when the Water valve 7c is closed; I'he upper end of the cylinder m is 4in communication with the Water inlet c through 35 a passage 1', so that Water in the cylinder m will be discharged ahead of piston q when the valve 1c is liftedl to operative position without offering any substantial resistance to the opening of the valve. At the same time when the valve 1c is 40 lifted Water will be drawn into the cylinder m, through` the restricted clearance between the stem Z and plug n, and when the valve k is moved from open to closed position the water below the piston q will be forced out through the clear 45 ance between the stem and plug with resistance due to the restricted clearance.

The steam nozzle d and e are closed by means of valves s and t, respectively, which are carried by a common stem u, the valve t being of 50 plug form and extending into the upper end of crosshead p. i K

The crosshead p, which is in effect a lever, is

secured to a vertically slotted support w by means of a pin I, or fulcrum, which passes through the slot in the support and to which the crosshead p is rotatably secured. To opposite ends of the pin with means adapted for closing the overflow valve y' when the line check valve h is opened. The means for such purpose, as illustrated, is described and claimed in the United States Letters Patent No, 1,743,684, dated January 1,4, vi930, to

Irene P. Pedrick, and comprise a cylindricall `chamber il formed beneath the line check valve h and 'controlled by a valve 'l connected with lost motion to the line check valve, and from which depends a plug 8 extending into-.and loosely fitting the chamber The chamber .6 is Yconnected to a chamber 9 above the overflow valve j by means of a vconduit l il. When the line check -valve h is opened, pressure is admitted to chamber 6 and passes to chamber il acti-ng on the overflow valve to close it. VWhen the line check is closed the pressure in chamber Will'be discharged, Von opening of the overflow valve, throughhconduit lll and valve l', which, as will be observed'by reference to Figure 1, may lift slightly independently of the line check valve.

In the operation of the injector in accordance 'with this invention, it will now be observed that upon manipulation .of lever 3, lin the-proper direction, the crosshead p will be lifted through the operation of linkage 2, lever s and links y. Due to the fact that live steam pressure will be upon the top oi valve t, the Water valve 1c will be more readily lifted than the steam valve and ,as a consequence the crosshead Will 'be lifted on its Vpivotal connection with'the stem of the .steam vvalve until stopped by the full opening of the water valve. Then the crosshead will lift on its pivotal connection with the stem of the Water valve for the opening of the steam valve. When the steam valve is cracked the live steam pressure under the valve will tend to ymake it ily open, vor in other Words to move the lever il ata rate'faster than normal manual manipulation, with the result that a force will operate `through the .crosshead to close the water valve and consequently prevent starting of the injector. As will now be clear, such force operating to tend to close the water valve during theopening of the steam valve, Will be effectively resisted by the necessity for the piston q to force water drawn into cylinder m around the loose tting stem Z inthe .opening movement of the water valve out of the cylinder through the restricted clearance around the 'loose tting stem Z, in the closing action or". the water valve. Thus, the cylinder 'm and piston q carried by the valve stem Z serve as a dash pot to prevent closing oi the water valve under the action of the steam valve in opening, While, at the same time, due to the provision of passage 1, no material resistance is oiered to the kdischarge of water from the cylinder m in the opening of the Water valve. When it is desired to vclose the water valve, such may be readily eected over the resistance offered bythe dash pot dueto the'leverage provided yfrom v'this invention shall be limited to the details of construction herein illustrated and described, as it willbe obvious to those skilled in the art that various modifications in detail may be made without departing from the invention.

What I claim and desire to protect by Letters Patent is: 4

1. In an injector, in combination, water and v steam valves, stems for said valves, a crosshead pivotally connected to said valve stems, lever mechanism connected to said crosshead and adapted Yfor manipulation Wherebysaid crosshead will be fulcrumed on its connection with the'stem of the steam valve to open the water valve and on its `connection with the stem of the Water valve to open the steam valve and a dash pot connected with the water valve and adapted to resist closure of. said valve in the opening movement of the steam valve. i

2. In an injectonin combination, water and steam valves, stems for said valves, a crosshead pivotally v.connected to said valve stems, lever mechanism `connected to said crosshead and adapted for manipulation whereby said crosshead will be fulcrumed on its connection with the stem ,of the steam valve to open the water valve and .on itsconnection with the stem of the water valve yto open the steam valve, a cylinder provided with an outlet from its upper end and with a restricted outlet fromits lower end surrounding the stem of the water valve, a piston carried by the water valve stem and adapted totravel in said cylinder, said `cylinder being adapted to receive and discharge water from the injector supply through said outlets in the travel of said piston on opening Aand yclosing of 'said water valve whereby resistance to the closing movement of said water valve .is afforded by the discharge of Water through the vrestricted outlet from .the lower end of said cylinder.

3. In an injector, in combination, steam and water valves, stems for said valves, a crosshead pivotallyconnected to said valve stems, a vertical guide for said crosshead, a hand lever pivotally mounted at a point remote vfrom said injector, a second lever ulcrumed on said injector, a link connecting said second lever with said crosshead intermediate its Iends and a linkage connecting said second lever with said hand lever.

. 4l. In an injector, in combination, steam and water valves, stems for said valves, a crosshead pivotally connected to said valve stems, a vertical guide for said crosshead, a quadrant positioned at pa point remote from said injector, a hand lever mounted in association with said quadrant and provided with a pawl adapted to engage notches therein, a second lever fulcrumed .on said injector, a link connecting said second lever with said crosshead intermediate its ends and a linkage connecting said `second lever with said hand lever. l

- :5. In an injector, in combination, valves for controlling the admission of steam and water respectively to the injector, said valves moving to Aopen .position yin the same direction, means for actuating the water admission valve against steam pressure acting on the steam admission valve, means for creating pressure operative in opposition to closure of said Water admission valve and means for actuating said steam admission valve against pressure acting on said water admission valve.

6. In an injector, in combination, a steam valve and a water valve, said valves opening in the same direction, a lever pivotally connected to said valves respectively, means for actuating said lever on its pivotal connection with said steam valve as a fulcrum to open said water valve and pressure means operative on said water valve when it is open whereby said lever may be actuated on its connection with said Water valve as a fulcrum to open said steam valve.

7. In an injector, in combination, a water valve, a steam valve, said valves opening in the same direction a lever pivotally connected to said valves respectively means for actuating said lever to open and close said valves and pressure means operative on said Water valve in its movement from open to closed position and adapted to resist closure of said valve.

8. In an injector, in combination, water and steam valves, stems for said valves, a crosshead pivotally connected to said valve stems, lever mechanism connected to said crosshead and adapted for manipulation whereby said crosshead will be fulcrumed on its connection with the stem of the steam valve to open the Water valve and on its connection with the stem of the water valve to open the steam valve, a cylinder provided with an outlet from its upper end and with a restricted outlet from its lower end, a

piston carried by the water valve stem and adapted to travel in said cylinder, said cylinder being adapted to receive and discharge water from the injector supply through said outlets in the travel of said piston on opening and closing of said Water valve whereby resistance to the closing movement of said water valve is afforded by the discharge of water through the restricted outlet from the lower end of said cylinder.

9. In an injector, in combination, a steam valve and a water valve, said valves opening in the same direction, a lever pivotally connected to said valves, means for actuating said lever on its pivotal connection with said steam valve as a fulcrum to open said water valve and a dash pot operatively connected to said Water valve and adapted to resist closure of said water valve whereby said lever may be actuated on its connection with said water valve as a fulcrum to open said steam valve.

10. In an injector, in combination, a steam valve and a water valve, said valves opening in the same direction, a lever pivotally connected to said valves respectively, means for actuating said lever on its pivotal connection with the steam valve as a fulcrum to open the water valve and, when the water valve is opened, to actuate said lever on its pivotal connection with the Water valve as a fulcrum to open the steam valve and means independent of said lever and actuating means therefor adapted to prevent closure of the water valve in the opening movement of the steam valve, said means being ineffective in the opening movement of the water valve.

IRENE P. PEDRICK.

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