US11030A - Water-level indicator for steam-boilers - Google Patents

Description

A. UNITED sTATEs PATENT oEEToE.

PATRICK CLARK, 4OF RAHW'AY, NEIN JERSEY.

WATER-LEVEL INDICATOR FOR rSTEAM-BOILERS.

Specification of Letters Patent No. 11,080, dated June 6, 1854.

To all whom t may concern Be it known that I, PATRICK CLARK, of Rahway, in the county of Essex and State of New Jersey, have invented a new and Improved Method of Indicating the Level of Water in steam-boilers and of regulating the supply of ywater fed the boiler and also of giving an alarm in case the water should get below the proper level.

The nat-ure of my invention consists in indicating the level of water in steam boilers and also of regulating the supply of water fed to the boiler and of giving an alarm in case the water should get below the proper level, by means of the action c., the expansion and contraction) caused by the change of temperature which occurs in a vessel or chamber connected with the boiler by means of tubes of sufficient length and of such material as will prevent said chamber from being heated or cooled except by the presence or absence of the steam caused by the rise or fall of the water in the boiler.

To enable others skilled in t-he art to make and use my invention I will proceed to describe its construction and operation.

In the accompanying drawings Figure l is a perspective view of my improvement as connected with a boiler. Figs. 2 and 3 are vertical sectional elevations showing the various parts.

The same letters refer to the same parts in all the figures.

A, Fig. l, is the boiler.

B B, Figs. l and 2, is a chamber connected with the boiler by the pipes E E, the uppermost of the two entering the boiler above the water level and the lower one below it.

C C are the legs of an inverted siphon one of which passes longitudinally through the' chambers B B, leaving a sufficient space between its exterior surface and the interior surface of the chamber to allow water to pass freely between them. The interior 'surface of the siphon should be tinned to prevent the liberation of hydrogen gas which' would change the induction of the instrument..

X X is a cap for closing that leg of the siphon passing through the chamber B B after filling it with water.

I I is a glass tube connected with the siphon at (w).

V V is a cock for blowing the air out of the space between the exterior surface ofy boiler by means of the tubes E E the level of the water in the boiler and in the space between the chamber and the pipe C will be the same. If steam is now raised all that part of the chamber not filled with water will be filled with steam. 'Now the difference between the temperature of the water in the annular chamber and the steam above it is such that any water in the tube C above the level of the surrounding water in the chamber B B is converted into steam while any steam in the tube C below the level of the surrounding water in the chamber is condensed. Hence the level of the water in that leg of the siphon inclosed in the chamber B will be always the same as the level of the water in the annular space surrounding it. Therefore if the water in the annular space around the siphon C changes its level, which of course it will should the water in the boiler change its level, the same change of level will occur in the inclosed leg of the siphon C which change may be seen in the glass tube forming a part of the other leg of the siphon C. By this means the indicationslmay be conveyed to any distance from where the boiler is located, common air inclosed in a small tube answering the purpose of conveying the indications.

D, Fig. 3, is a branch of the main chamber B B, having inserted in it the tube F, the inner end of which is closed to prevent any communication between the water surrounding it and the water inclosed in it. It is filled by means of the cock H.

Gr is a tube leading from the lowest point of the tube F to a piston and cylinder (or any well known device for producing motion by means of fluid pressure) located near the valve which governs the supply of water to the boiler and connected with it in such a manner that the pressure against the piston will move the valve so as to increase the supply of water to the boiler. The operation of this'part of my invention is as follows: The tube F being filled with water throu h the cock H and the cock closed the tube g) being in connection with the cylin-` der and piston as described. If the Water should now fall in the boiler and chamber so that the steam could enter and surround the pipe F, the Water in the tube F would become Converted into steam, causing pressure to be exerted against the piston, which Would Open the supply valve and allow the Water to be pumped into the boiler. ShouldA the Water rise again in the boiler the press'ure would cease and the supply be out 01T.

1What I claim as my invention and desireto secure by Letters Patent is Ihe arrangement of the tube C and F in relation to the chamber B in connection With the boiler, whereby through the action 15 a valve in the feed Water pipe substantially 20 as described.

PATRICK CLARK.

Witnesses JOHN MOORE, I. N. MATHER.

Images