Improvement in xpumpingren
US 182387 A
Description (OCR text may contain errors)
E. G. s'HoRTT.
No. 182,387. Patenped Sept. 1 9, 1876 WITNESSES z v TATEs EDWARD e. sacem, on GAECUHAGE, NEW YORK.
IMPROVEMENT IN PUMPINGQENGINES.
Specification forming part of Letters `latentNo. 182,3S7ydated September 19, 1876; application-filed February 28, 1876.
ton, having an inlet and cut-olf valves for steam at one end and inlet and exhaust for water at the other end, togetherlwith air and vacuum chambers, contrived as hereinafter described.
Figure 1 is a sectional elevation of my improved pumping-engine, and Fig. 2 is a top view.
Similar letters of reference indicate corre-gV `spending parts. E, in the drawing, represents a vertical cyl-I inder. G is an accurately-litted head, its length being equal tothe stroke.
prevents the mingling of steam with the water or other liquid under the head, on its stroke.`
The valve H `preventsthe water from passing the head on its downward stroke. The valve O allows the liquid to compress the air in thej chamber F of said head, and prevents its return.
part ofthe cylinder E'through the tube N into the upper portion of the cylinder occupied by the steam, the object being to arrest the molecular atoms of water which adhere to the surface of the hot cylinder from flashing into steam, which otherwise would expand and fill thecylinder and prevent a vacuum. A and B represent air and rvacuum chambers, the upper wall of which forms a bed for the cylindex-,E to rest on. X `is the dischargepipe, and Z the suction-pipe. D and C are passages to and from the pump. J and K are suction and discharge valves. P is a bracket forming the bottom of head and guide for the valve-stem I. Y is a tubular extension of head G, which projects so as toextend below the discharge-port K when the head is down, for the purpose of causing the steam to pass through the water before reaching the said pjort, thus making condensation certain within the valve-case covers.
A This head, is provided with valves M H O. The valveM;
When a vacuum is formed above the. head, the expansion of the air below the same instantly injects cold water from vthe lower the cylinder, and preventing the `unnecessary slamming of the valves, which-woul'd-otherwise be caused `by fthe escape of steam past the said valves, aud the forming of va v'acuumin the valve-case. tand` b are boltswhiich secure L isa disk to prevent the steam-jet from'agitating `the-waterof condensation, which takes its vpos'itioniunder said disk. From thisdisk projects a hub,cl, forming aguide "for the `valve-stem I, also forming a plug to checkthe Vsudden iniowof steam bynearly closing the opening j, leading'from the steam-valve U, and gradually opening it as the head G -recedes The sudden admissionof a-largevolume of steamto the cylin- -der `E would ibrcethe-piston-dowu instantly,
and slam the valves J and K violently. W
is a cut-off `case,which contains the steamvalve U and `valve-seat and guide V. Rris a counter-balance connected with the balancevalve U,.to equalize the wedging-action ofthe steam between theseat and valve when open.
T is amilled nut, whereby the steam-valve may be operated by hand at will.
ber cushion for steam-valve. `VV'is-asteampassage, .and X' is an ordinary steam-valve.
To-startthe `pump when vfirst set up, it Vis only necessary to pour a small quantity of water into the cylinder, thenopen the globevalve X and -raise the steam-valve U by means ofthe milled nut T, which allows `the steam to How into the cylinder E, forcing the air therefrom through port K', the head G be? ing at the bottom of the cylinder, and Vresting on the bracket P, so that the valve-stem I, projecting below the bracket P,'holds the valve M open, and allows the steam to come in contact with the water. Then, bly closing the steam-valve U, a partial vacuum is formed.
The steam is then again admitted, and theV As the valve M (the only means of escape p Sis-a rubl of chamber B into the cylinder.
for the steam) is closed, the head G is forced downward, forcing thc water with it until the valvestem I is brought to bear on the bottom of the cylinder, when head G leaves the valve M, which is thereby opened and. allows the steam to pass through the piston, past valve H, and exhaustinto the water below the piston, which condenses it instantly, thus forming nearly a perfect vacuum in the c vlinder E, the valve UY being atthatinstant closed by the pressure of the atmosphere. There is always a quantity of air in the chamber B, suicient to till about onethird of the' same at the ordinary pressure of fifteen pounds to the square inch, and when the vacuum is formed in cylinder E, beneath the piston, the air instand)1 expands land forces the water out At such time the foot-valve Z is held closed by reason of the .pressure in the chamberB being superior to the atmospheric pressure without. .But the instant :the piston begins to descend again, so that the valve J closes, the water at once rushes past the foot-valve and into the chamber B .with great force, thus compressing the air as before. ln this respect the action is similar to what takes placein a hydraulic ram. When Water enters the cylinder Eajet is forced through tube, N, above the piston. The steam-Valve -U is held open while steam is to be admitted by the pressure of steam under it, but is closed Aby atmospheric pressure as soon as it is allowed to descend by the forming ofthe lvacuum -underi the action being gentle, s0 5 to prevent hammering the seat by the valve. It
will ce seen that the steam cut-off valve is vpractically closed by atmospheric pressure; .also that the plug i secures a gentle liow of steam as it enters the cylinder at the comniencement ol" l'each stroke, while it has invstainJ pressure against the stein of valve U,
for the purpose of forcing` the said valve open.
exhaust, and secures at all times a hot steaincylinder into which the water to be pumped has no access either to space or surface. By
it to take in only sufficient water for condensa-- tion purposes.-
Having thus described my invention, I claim as new and desire to secure by Letters Patentl. rlhe steam-cut -off valve V open to the atmosphere on its upper side, in combination with the steam and vacuum chamber E, and the reciprocating piston, as shown and described, whereby the valve is seated by atmospheric pressure just previous to the upward stroke ofthe piston, as set forth.
2. The combination ofthe plug t', the passagej, the cut-off valve, the piston, the valve J, and chamber B, as shown and described, to operate as specified.v
3. The air-chamber B, and supply-pipe Z,
provided with valve Z', in combination with the passage G, valve J, cylinder E, and piston having the valve M, substantially as shown and described, whereby the expansion of air in said chamber forces the water into the cylinder when a vacuum is formed therein, as4 set forth. Y
4. The combination, with cylinder E, of the head Gr, and its valves H M O, arranged and operating substantially in the manner described.
EDWABD Gr. SHORTT.