US935955A - Rod steam-packing. - Google Patents

Description

0. D. H. BENTLEY. BOD STEAM PACKING.

APPLICATION FILED JUNE 15, 1909. 935,955. Patented 001:.5, 1909.

. C i i E K a f 55 FIG. 2.

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INVENTOR [31 Jzlomz'y WITNESSES:

To all whom it may concern:

I UNIT srna ns PATENT OFFICE.

' OIiIVEB D. H. BENTLEY, OF NEW YORK, N. Y., ASSIGNOR TO E. W. BLISS COMPANY, OF

' BROOKLYN, YORK, A CORPORATION OF WEST VIRGINIA.

ROD STEAM-PACKIN G.

Patented Oct. 5, 1909.

Application filed June 15, 1909. Serial No. 502,287.

Be it known that I, OLIVER-D. H. BENT- LEY, a citizemof the United States, residing in the boron h of Brooklyn, county of Kings, city an State of New York,'have invented certain new and useful Improvements in Rod Steam-Packin of which the following is a specification.

This invention relates to a packing for piston rods, valve rods or the like, used in connection with steam engines, throttle valves, and elsewhere where steam is the fluid to be packed against.

According'to this invention the'rod is carried from the inner or steam chamber to the exterior, through a close-fitting bore formed in a suitable neck, the fit being a close working fit, so that while the rod may easily move through the bore, yet the intervening space is so thin as to preclude any butan extremely minute leakage of vision is made for insuring the condensation of the minute quantity of steam which can leak into this narrow space. For this purpose the neck through which the rod or stem emerges is fluted, corrugated, 'or otherwise disposed upon its exterior so as to afford a considerable radiatin surface whereby to cause a sufliciently rapid cooling of the neck;

or, where practicable, the neck is formed with a jacket or passage through or surrounding it, for the circulation of a cooling fluid. By thus causing the condensation of the minute quantity of steam which can en ter a contracted space or clearance between the rod and bore, this space is so eflectually packed as to exclude all leakage except a quantity so minute as to be negligible. v

Figure 1 of the accompanying drawin s shows my invention as applied to a thrott e valve or overnor valve fora steam turbine or other orm of steam. engine, the view being a vertical mid-section. Fig. 2 is a fragmentary elevation of the neck portion of the structure shown in Fig. 1. Fi 3 is a fragmentary section showin a mo ification.

Referring to Fig. 1, is a casing or shell in which steam is admitted at B, and from which it escapes at C, the shell being formed between with a' artition D. dividing it into two chambers w ich communicate throu h openings or steam ports E E, in which wor s a balanced valve F of a well known con-- struction. The top of. the shell A is closed by a cap or cover G. The valve rod H steam. Proa passes out through this cap, and its upper end may be connected with any operatlng means such, for example, as a lever I and a spring J- by which to raise and lower the rod, and thereby operate the valve. So far do as described this is a common and well known construction.

Instead of providing a stufling-box, or

other common form of packing for the rod H,

I construct the cap G with a suitably pro- 5 bore 1s reduced to the minimum, not only by 71) the closeness of their fit, but also by making the rod of as small diameter as is practicable. The neck K is sufficiently long to insure the condensation of the .minute quantity of steam which can leak into this clearance. "75.

To insure this condensation the neck is formed exteriorly with a succession of projections, either in the form of concentrical ribs L L as shown, or in any other manner whereby the exterior surface of the neck '80 which is in contact with the air, is so in-. creased as to sufliciently promote the radiation of heat, and thereby'insure the condensation of steam in the leakage space or clearance'aroundthe rod. It results from this .85 construction that the infinitesimal quantity of steam which can enter this clearance is necessarily condensed therein, and the weight .of the condensation water opposes itself to the upward leakage of the steam. The con- 90 densation water is very slowly formed, and

slowly works its way upward throu h the clearance space, so that at considera le intervals a drop of water is discharged at the top..

neck is shown as screw-threadedto receive an adjustable nut M, whereby to vary the tension of the spring J; but this forms no part of the present invention. 7

Referring to Fig. 3, the shell A, the valve F and the rod H are of the same construction as shown in Fig. 1; but the cap G is modified, its neck K being made shorter,

and instead of its exterior being ex osed to 105 the atmosphere for the radiation 0 heat, it is formed with a jacket P surrounding it (preferably as "shown by coring out this jacket in the same casting), and provision is made for causing a circulation of cooling 110 95 I In Figs. 1 and 2 the upper end of the fluid through this jacket P.. For this purpose an admission pipe Q and a discharge pipe R, are provided. The cooling fluid may be water or, air under suitable pressure, or any other suitable or convenient fluid. The length of the jacket P of the neck K should be suitably proportioned with reefficiency. When a given length of neck andsize of acket has been determined upon,the cooling medium must thereafter be maintained of suitable efliciency to cause the condensation to take place at a desirably rapid rate.

It is important to have the rod or stem extend vertically or nearly so to the packing, the steam chamber being located beneath, so that the gravitation of the condensation Water is rendered eifective in resisting leakage.

I claim as my invention 1. A steam packing, comprising. a neck between the steam chamber and the exterior, and a slender rod passing through said neck, the neck being bored to a close working fit with the rod, and being of suflicient length to insure the condensation of any steam leaking into the minute clearance space between the rod and bore whereby without other packing means the condensation in said space affords a suflicient obstruction to the escape of steam.

2. A steam packin projecting upwardly trom the steam chamber to the exterior, and a slender upright comprising a neck rod passing through saidneck, the neck beminute clearance space between the rod and bore whereby without other packing means the condensation in said space aflords a sufficient. obstruction to the escape of steam, and whereby the gravitation of said condensation is utilized to oppose leakage.

3. A steam packing, comprising a neck between the steam chamber and the exterior, and a rod passing through said neck, the neck being bored to a close working fit with the rod, and provided withmeans adapted to promote radiation of heat in the neck, to insure the condensation of any steam leaking into the minute clearance space between the rod and bore whereby without other packing means the condensation in said space affords a sufiieient obstruction to the escape of steam.

4. A steam packing, comprising a neck between the steam chamber and the exterior, and a rod passing through said neck, the neck being bored to a close working fit with the rod, and provided with external projections adapted to promote radiation of heat to.,the atmosphere, to insure the condensation of any steam leaking into the minute clearance space between the rod and bore whereby without other packin means the condensation in said space a ords a sufficient obstruct-ion to the escape of steam.

In witness whereof, I have hereunto 'si ed my name in the presence of two subscri ing witnesses.

OLIVER D. H. BENTLEY. Witnesses:

EDWIN G. KN'aPP, ARCHIE S. MCLUNDIE.

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