US82025A - Improvement in low-water alarms for steam-generators - Google Patents

Description

UNITED STATES PATENT QEEIGE.

STEWART B. PALMER, OF SYRACUSE, NEW YORK.

IMPROVEMENT IN LOW-WATER .ALARMS FOR STEAM-GENERATORS.

Specification form/ing part of Letters Patent No. 82,025, dated September S, 1868.

To all whom it may concern Be it known that I, STEWART B. PALMER, of Syracuse, in the county of Onondaga and State ot' New York, have invented a new and useful Improvement in Low-Water Alarms for Steam Generators; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making part ot' this specilication, in which- Fignre l is a perspective view of the completed instrument as applied to a steam-generator; and Fig. 2 is a perspective view, showing the lower chamber, the whistle, and the means for conducting the steam from the chamber to said whistle.

Similar letters denote corresponding parts in both .igures This invention relates to that class ot' low water alarms in which the expansion of metallic tubes is made to operate upon the valve of' an alarm-whistle, by which means notice of the lowwater level which has obtained within the boiler is given to the person in attendance 5 and it consists in the combination of metal tubes closed at their upper or outer ends by being surmounted with an air-chamber, and a chamber to which the lower or inner ends of such tubes are attached, and through which they are supplied with steam from the'generator, with rods running from the lower chamber to and connecting with the air-chambers on the outer ends of the tubes, and with levers, also connected to the' airchambers, and to a rod leading to the disengaging mechanism ot the whistle-valve, said rod being included in the combination; and it further consists in the arrangement of a whistle and its valve-disengaging mechanism, with reference to the chamber from which it receives steam.

In the annexed drawings, A is a tube or pipe by which the device is, or may be, connected to the generator, and which extends downward therein, terminating at the lowwater line, so that as the water reaches that point steam will enter the pipe and pass through the chamber B into the tubes 0, causing them to expand sufiiciently to operate upon the valve-disengaging device, by which means the alarm is sounded.

B is the lower or inner chamber, to which the pipe A and tubes C C are attached. This chamber is triangular in its cross'section, the space within it being of the same configura tion for the purpose ot conductin g steam to the tubes G. Y

C C are tubes extending upward or outward from the {chamber B to any desired extent which may be necessary to give them the requisite iiexibility, their outer ends being` closed by their being surmounted by airchambers D D, in the form of spheres, or ot' any other suitable shape. These tubes are firmly attached to the chamber B, and the space within them communicates with the steam-space withinsaid chamber, so that as the water within the generator falls below the mouth of the pipe A, steam will enter said pipe .and pass up to the chamber B, and thence into the tubes C C, thus increasing the temperature of said tubes, which, in consequence of their heilig held in position by the rods F F, and of their increased length caused by such increased temperature, will assume the position shown by dotted lilies in Fig. 1. As a consequence ot' the above-described change of position of the tubes, the links a a will have their lower ends carried farther apart, which action will depress their upper ends, thus carrying down with them the rod H, which rests upon and opens the whistle-valve.

E is a plate of metal secured to the back side ot' the chamber B, and extending up in an inclined position until its upper end is nearly in a line with the tubes C C, its extreme upper end being slotted so as to receive and form a guide for the rod H, which bears upon the whistle-valve. At a suitable distance above the whistle a lever, I, is pivo'ted to the plate E, and projects forward some distance and rests upon the stem of the whistle J. Upon the upper side ot' this lever, and immediately above the whistle, rests the rod II. The arrangement oi' these parts is such that when, by the increased length of the rods (.l C, consequent upon their expansion, they depress the upper ends of the levers a a, it carries down the rod H and lever I, which act immediately upon and open the whistle-valve.

To provide against the :necessity o' leaving the whistle-valve open, and consequently, the whistle sounding until the water has been supplied to the generator in suicient quantity to cover the mouth of the pipe A, provision is made for closing said valve at once by providing an oiset or notchin the upper side of the lever I, so that as the rod H is driven forward by means of a cord attached to a ring formed upon said rod, it (the rod) is removed from its bearing upon the lever I, and the said lever and w'histlcvalve are allowed to risc,thus shutting oft` the steam. F F arethe rods above referred to, which are at their lower vends secured to ears or projections upon the lower edge of the chamber B, said rods Vcarrying upon their extreme lower ends, and beneath the ears, nuts G G, for the purpose of lengthening or shortening said rods.

J is the whistle, which is secured to the up per side of the chamber B,and is constructed in the form of a tube, having a sliding plate arranged upon its front face for adjusting the pressure Within said whistle, and for removing any sediment that may collect therein.

K is the pipe through which dry steam may be conducted to the whistle from any conven ient place, or, saturated, may be supplied from the chamber in the base B.

a. a are the links which are connected to the 1. The combination of the chamber B, tubes C O, with their surmounting chambers D D, rods E E, links a a, and rod H, arranged `and operating substantially as shown and described.

2. The arrangement of the rod H, lever I, and spring b, with reference to the whistle J, and its valve.

In. testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

vsrnvv'nar B. PALMER.

Witnesses: Y Y

GEo. H. GILBERT, I. H. HoLooMB.

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