US142091A - Improvement in direct-acting steam-pumps - Google Patents

Description

.arn'nvr Prion Os'CAn '.r. nAnLE, on NORWALK, CONNECTICUT. I

. IMPROVEMENT IN DIRECT-ACTING STEAM-Pumps.

. Specification forming part of Letters Patent No. 142,991, dated August 26, 1873; application filed yMarch 22, 1873.

To all whom it may concern: 4

Be it known that I, OSCAR T. EARLE, of

Norwalk, in the county of Fairfield and the by means of which any packings subject t o expansion and contraction under variations of temperature may be easily and readily adjusted or loosened to compensate for such expansion or for the wear, as occasion requires. This packing device is especially applicable to the class Of steam-pumps known as closelyconnected steam-pumps,77 and by/its-employ-n ment between the two cylinders of such pumps allows a perfectly-close connection to be made between the'same vwithout any open intervening space, and a perfectly adjustable packing around the piston-rod, which has not hitherto been possible. The second part of my invention relates to a new and improved-puppetvalve to be used in connection with the steamcylinder when the main valve is operated by the pressure of the steam in the valve-chest;

. and it consists of an ordinary dat disk-valve,

with an annular groove around its face containing elastic packing, and attached to a valve-stem, recessed or bored at its upper end to admit the steam around or through it from the induction-port into the steam-chest, and chambered or bored at its lower end, making a port through the same, terminating opposite a port connecting with the main exhaustport when the valve is upon its' seat, and leading from the steam-chest into said exhaustport. Puppet-valves, operated by the direct action of the steam-piston, have heretofore been used to admit and cut of the steam'alternately on each side of the main valve; but hitherto the steam has been passed through ports drilled in the body of the steam-chest,

and not through recesses or chambers in the valve-stem, as in myinvention, which presents many advantages over the former method, being greatly cheaper. The third part of my invention relates to a new and improved p1uni ger for steam pumps or engines, consistln g of a hollow tube of metal, either drawn or cast,

and turned or otherwise finished on its outside to aV true surface, and conned, in any suitable manner, upon or between suitable heads, forming a hollow plunger or piston of little Weight in comparison to those heretofore used, and one that can be renewed as often as worn by simply removing one of the heads and substituting a new tube for the old one.

The drawing, Figure l, represents a longitudinal section of the steam-cylinder of my pump, and. Fig. 2 a section ofthe water-cylinder.

A represents the steam-cylinder, and B the water-cylinder of the steam-pump. A represents the valve-box of the steam-cylinder, and B the valve-box of the water-cylinder. C C represent the valves innthe valve-box of the water or pump cylinder, constructedof suitable elastic material, and formed with a bead or shoulder, c c, around their rear surfaces to hold the spiral spring C', which presses them against their seats. D represents the stuffing device for packing the piston, consisting of an elastic annular disk of expansible material fitting in the end of a recess or chamber, E, made for it, and confined therein by a plug, F, having a recess, f, cut around it, as shown, leaving a beveled shoulder. at the front end, against which a screw, G, with a conical end corresponding with the bevel, may be forced "for tightening or pressing said plug against the packing and spreading it when required. H represents a stuffing-box set into and secured to the interior of the cylinder of the pump, and lcontainin g an elastic packing-ring, I, which is confined and tightened in its place by means of a gland, J which maybe adjusted by a screw, K. L L represent the puppetvalves in the valve-box ofthe steam-cylinder, having an annular groove around their faces containing an elastic packing, l l.' The said valves have their seats around the apertures M M leadingv into the steam-chest in which the slide-valve N, between the two valve-pistons N1 N2, travels. 'Each of these valves is attached to a valve-rod, O, recessed at its upper end, or bored, so as to form a passage between the induction-'port and the steam-chest when the valve is raised. The lower ends of said valve-rods are chambered or bored, as shown,

so as vto form ports l? l? through the'same that terminate opposite ports Q, Q, connecting with the main exhaustport of the engine when said valves are in their seats.

These valves are operated by the piston of the engine at each stroke through the medium of the valve-rods, as may be seen, and serve to admit and exhaust the steam alternately from each side of the piston-valve in the valvechest, giving it the proper reciprocating motion to alternately change the ports of the steam-cylinder to put the main piston in motion, as will be readily understood by those familiar with this class of engines.

R represents a hollow tube of metal, either drawn or cast, and turned or finished on the outside to fit the interior of the cylinder in which it is placed, and supported upon or between the heads S S in any suitable manner. Both heads, or either of them, are connected with the piston-rod, which may pass through the center of the tube, when desired, to strengthen the plunger.

Having described my invention, what I claim 1s- 1. The gland F, with the annular beveled shoulder, in combination with the set-screw Gr for tightening the packing-ring D, substantial] y as described.

2. The puppet-valves with recessed or chambered valve stems or rods, constructed and operating as described.

3. The hollow plunger, consisting of a tube secured between heads S S' in such a manner that it may be readily removed and replaced when worn, substantially as described.

OSCAR T. EARLE.

Witnesses:

CHAs. L. OooMBs, J. G. LATHROP.

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