US480811A - duffy - Google Patents

Description

2 Sheets-Sheet 1.

(No Model.)

J. J. DUFFY.

FLUID PUMP 0R oomrnnsson.

Patented Aug. 16, 1892.

II v 1 I 4 A -Ll lll V V// 443/611. e Jaea (No Model.) 2 SheetsSheet 2.

. J .J DUFFY.

FLUID PUMP 0R COMPRESSOR.

No. 480,811. Patented Aug. 16, 1892.

IIIIIIIIIIIIMIHIIMIW IIIIIIHIIIIIIIIHII is IIIHI I1 I ll .I llllll UNITED STATES PATENT OFFICE.

JOHN J. DUFFY, OF CLEVELAND, OHIO, ASSIGNOR TO EDWARD P. BATES, OF

SAME PLACE.

FLUID PUMP OR COMPRESSOR.

SPECIFICATION forming part of Letters Patent No. 480,811, dated August 16, 1892.

Application filed October 5, 1891. Serial No. 407,736. (No model.)

T on whom it may concern: of the suction-valves c c, and D D represent Beit known that I, JOHN J. DUFFY, of Olevethe chambers of the delivery-valves d 61, hereland, in the county of Ouyahoga and State of tofore employed. The construction and ar- Ohio, have invented certain new and useful rangement of these valves and chambers are 55 Improvements in Fluid Pumps or Oompresstoo well known to require description in this ors; and I do hereby declare the followspecification. Suctionvalve chambers O 0 ing to be a full, clear, and exact description are of course in open relation with cylinder of the invention, such as will enable others or barrel A, as at 0 and heads A A are skilled in the art to which it pertains to make chambered, as at a, to make open communi- 60 IO and use the same. cation with cylinder Aand accommodate the My invention relates to an improved fluid movement of delivery-valvesEE hereinafter pump or compressor especially well adapted described, and passage-ways a are provided for compressing aeriform bodies. for conducting the fluid from chambers to to My invention consists more especially in the valve-chambers D D or directly to are- 65 r 5 the provision of adelivery-valve wherebythe ceiver. (Not shown.) Valves d d, in confluid that has been received and accumulated nection with my improved fluid pump or comin the cylinder or barrel of the pump orcompressor, constitute check-valves and may be pressor between the piston and said valve will dispensed with, if desired. all be discharged during the next succeeding E Erepresentmyimproved delivery-valves 7o :0 stroke of the piston without the possibility located, respectively, at opposite ends of cylof any of the fluid thus discharged to return. inder A. These valves comprise,respectively, My invention consists, also, in the combia disk or cylinder reduced in diameter, as at c, nation, with such delivery-valve, of the stuifthe reduced section fitting nicely within cyling-box of the piston-rod; and it consists, also, inder A, the ends of the latter constituting 75 in certain features of construction and in comthe seats for these valves. Valves E E are bination of parts hereinafter described, and fluted or milled or provided in any suitable pointed out in the claims. manner with alternating depressions and ele- In the accompanying drawings, Figure 1 is vations on their peripheries, as at 6, whereby a vertical longitudinal central section of a numerous channels are formed for the escape 8o 0 double-acting fluid pump or compressor emof the fluid from cylinder A when the valves bodying my invention, showing the piston in are lifted off their respective seats.

its movement toward the right-hand end of Between delivery-Valve E and head A is the cylinder. Fig. 2 is a vertical longitudilocated a spring F, preferably a coil-spring,

nal section of the right-hand end of the pump as shown, head A and valve E having, re- 8 5 or compressor, showing the delivery-valve E spectively, the latter a depression, as at 6 moved by the piston somewhat farther from and the former an inwardly-projecting flange its seat. Figs. 3 and 4 are respectively the or member, as at a whereby spring F is former a plan View and the latter a side elemaintained in a central position relative to vation of said delivery-valve, showing more valve E and perpendicular with said valve. go clearly the construction of said valve. The construction and arrangement of head A represents the fluid cylinder or barrel of A and delivery-Valve E, employed at the i a double-acting fluid pump or compressor, the other or opposite end of cylinder A, as shown, same being preferably enveloped by a waterare substantially the same as the construction jacket A. and arrangement of the corresponding parts 5 A A represent the respective heads of the of the right-hand end of said cylinder already fluid or compressor cylinder. described, excepting that valve E is elon- B represents the pump or compressor pisgated and extends through head A the latter ton, and 13 its piston-rod, the latter connectbeing correspondingly perforated and termiing with a piston working in the steam-cylinnating in a sleeve a that, in conjunction with too der S of the pump or compressor. gland a and packing a interposed between C 0 represent, respectively, the chambers the sleeve and valve E and held in place by the gland, constitutes a stuffing-box for said valve, gland a being tightened by bolts a, connecting the gland with head A of cylinder A. As shown, delivery-valve E also terminates in a stufling-box-viz., for the pistonrod, being chambered for receiving packing b and a follower b, and being screw-threaded externally for receiving the corresponding internally-threaded cap 12 for tightening the follower of the stuffing-box.

As piston B moves from left to right, a shown in Fig. 1, of course delivery-valve E will be opened and suction-valve will be closed, and when the piston has made contact with valve E the entire fluid contents of the cylinder A at the right of said piston previous to said stroke of the piston will have been discharged. The piston may or may not move farther-that is, lift valve E farther from its seat against the action of spring F, as shown in Fig. 2. In either case, as the piston recedes or commences its return stroke delivery-valve E, under action of spring F, will return with the piston, maintaining close contact with the piston until the valve will again have resumed its seaton the end of barrel or cylinder A, and it will therefore be seen that there is no possible opportunity for any of the fluid just discharged from cylinder A to return. Delivery-valve E having reoccupied its seat, as just described, and piston B continuing in its return stroke, suction-valve 0 will be opened, admitting a new supply of fluid into cylinder A at the right-hand side of the piston, while the fluid that during the preceding stroke of the piston has accumulated on' the opposite or left-hand side of the piston is being discharged, suction valve 0' having closed and delivery valve E and checkvalve (1 (if the latter is employed) having been opened. Piston B willcontact with valve E and likely move it farther from its seat, the operation and result being substantially the same as described in connection with valve E, except that valve E may or may not have a spring F connected therewith, as the pressme of the fluid contents remaining in the chamber of head A together with the ordinary atmospheric pressure, will be sufficient in most instances to maintain valve E in contact with the piston until the valve has reoccupied its seat on the end of cylinder A. In case, however, a spring is employed the same is confined on the valve within chamber a of head A immediately at the rear of the enlarged section of valve E, as shown in Fig. 1.

Vith my improved pump or compressor it will be observed that all the fluid at the respective side of the piston in the fluid-cylinder of the pump or compressor is entirely discharged without the possibility of the same returning to said cylinder, and hence the f unctions of the pump are not interfered with, as is the case with the pumps heretofore devised.

Of course if my invention were embodied in a single-acting pump or compressor but one delivery-valveviz., the valve having the piston-rod stuffing-box combined therewith would be employed and the advantages as compared with single-acting pumps or compressors heretofore devised would be equally marked.

What I claim is 1. In a fluid pump or compressor, the combination, with a fluid-cylinder having outlets at its extreme ends, a piston, and valves constructed to move in the ends of the cylinder and having air-passages formed between them and the wall of the cylinder, of air-chambers formed outside of the valves and in commu- "nication with the airpassages, valves in the passage-ways constructed to permit the fluid to flow outward, and suction-valves in the cylinder, substantially as set forth.

2. The combination,withacylinder open at one or both ends and piston, of a deliveryvalve seated at the open end or ends of the cylinder and having a reduced section extending into the said cylinder and having alternating depressions and elevations on its periphery, substantially as set forth.

3. In a double-acting fluid pump or compressor, a delivery-valve seated at each end of the fluid-cylinder of the pump or compressor, said valves being adapted to be engaged when havingbeen removed from their respective seats by the piston of the fluid-cylinder, one of said valves having a spring connected therewith and the other delivery-valve being perforated for the passage of the piston-rod and extending outside the adjacent head of the fluid-cylinder and terminating in a stuflingbox for the piston-rod, said adjacent head of the fluid-cylinder also terminating in a stuffing-box for said last-mentioned valve, sub stantially as set forth.

4. In a fluid pump or compressor, a delivery-valve seated at the end of the fluid-cylinder and having a reduced section extending into said cylinder and having alternating depressions and elevations on its periphery, substantially as and for the purpose set forth.

In testimony whereof I sign this specification, in the presence of two witnesses, this 18th day of September, 1891.

JOHN J. DUFFY. Witnesses:

O. H. Donna,

WARD HOOVER.

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