US338686A - John b - Google Patents

Description

(No Model.) 8

J. E. SPENCER.

AUTOMATIC DAMPER REGULATOR. No. 338,686. PatentedMar. 28, 1886.

UNITED STATES PATENT EEic JOHN E. SPENCER, OF SALEM, MASSACHUSETTS, ASSIGNOR OF ONE-HALF TO SMITH & SMART, OF SAME PLACE.

AUTO MATIC DAM PER-REGULATO R.

SPECIFICATION forming part of Letters Patent No. 338,686, dated March 23, 1886.

Application filed December 26, 1885. Serial No. 186,722. (No model.)

2" all whom it may concern:

Be it known that 1, JOHN E. SPENCER, a citizen of the United States,residing at Salem, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Automatic Damper-Regulators; and I do hereby declare that the same are fully described in the following specificawtedin the accompanying draw- ;b ings. This invention relates to improvements in automatic damper-regulators for automatically regulating the damper within the flue or smoke-stack leading from a steam-generator, 1 according to variations in the steam-pressure in the latter, so as to retain as near as possible a uniform or normal pressure therein.

United States Letters Patent No. 327,337 were duly issued to me September 29, 1885, for

2Q improvements in automatic damper-regulators, and in said patent I employ a stationary cylinder having its movable piston connected to the damper or its connections, and a valve,

the stem of which is connected directly to the 2 weighted lever of the steam-pressure device; but I have found that in practice such direct connection of the valve and lever causes the damper to close fullyin one continuous motion as soon as the piston in the regulator-cylinder b commences to move, and to open in the same continuous motion when the piston commences to movein the opposite direction. In damperregulators of this class it is very essential that the damper should be gradually closed, or

3 5 partly so, in proportion to the increase of pressure in the steam-generator, and that it should likewise be gradually opened, or partly so, as the pressure decreases, and such movements of the damper should be steady and 0 gradual; and for this purpose I arrange in my present invention, between the regulator and the main lever of the pressure device, an intermediate or secondary lever,.the outer end of which is suitably connected to the pressuredevice lever, and the inner end of such intermediate lever being preferably hung on a fulcrum attached to the movable piston, and having connected to it, between its ends, one end of the valve-stem. As a modification of my invention, the said intermediate lever may be hung on a stationary fulcrum, its outer end connected to the main lever of the pressure device and its inner end connected to the valvestem of the regulator-valve, as will hereinafter be more fully shown and described, reference being had to the accompanying drawings, where Figure 1 represents a perspective view of the invention, showing in section the regulator-cylinder, its piston and valve. Fig. 2 rep- 6o resents the modification of the invention.

Similar letters refer to similar parts wherever they occur on the different parts of the drawings.

A is a suitable pressure device, having 6 3 within it a diaphragm or other movable or yielding part, on which the steam from the boiler is acting, as usual. to is the pipe leading from the boiler to the under side of the pressure device A, in the usual manner.

B is the pressure-lever, as usual, hinged or pivoted at b to the pressure device A, and resting upon the spindle a, extending from the diaphragm in the pressure device A,in the same manner as shown and described in my 7 patent aforesaid.

B is the adjustable weight on lever B, as usual, such weight being provided with a setscrew or suitable fastening device, by meansv of which it can be secured to lever B, after it has been adjusted thereon according to the pressure desired in the generator.

0 is a stand or guide for the lever B, such guide being provided with suitable set-screws, as usual, to limit the swinging motion of said 8 lever B.

ends of which are secured or made in one 5 piece, respectively, the hollow piston-rods e and e", that pass through stuffing-boxes at the upper and lower ends of the cylinder E, and v 2.1121 closed in their extreme upper and lower en s.

e is a pipe leading fromthe lower end of piston-rod e, serving as an outlet for the exhaust from the regulatorcylinder, and e is the inlet-pipe, as usual, to the cylinder E, leading from the steam-generator or any other suitable source of pressure.

F is the flue or chimney leading from the boiler, and having located within it the oscillating damper f, the axis of which is provided with crank f, to which is hinged the connecting-rodf, the lower end of which is hinged to lever f', as shown in Fig. 1. The rear end of leverf is hinged to the stationary fulcrum and between it and the rod f the leverf is hinged to the lower end of the piston-rod 6. According to circumstances and localities, other suitable and equivalent connecting mechanism may be employed between the end of piston-rod e and the damper f.

So far as described, the invention is constructed in the same manner as shown and described in my above-mentioned patent.

To the upper end of the piston-rod e is secured the arm or bracket 9, having fulcrumpin 9, to which is hinged the inner end of the intermediate lever, G, as shown in Fig. 1, the outer end of such lever being coupled to the outer end of the main pressure-lever B by means of pin B, secured to lever B, and passing through a perforation in the outer end of lever G, or vice versa, or in any other suitable manner; or the end of one lever may be made to rest on the end of the other, or on a projection thereon, without departing from the essence of my invention.

G is an adjustable weight located on the intermediate lever, G,which, in connection with the weight B on lever B, serves to regulate the desired pressure on the pressure device A, which is the one to be kept normal in the boiler.

H is the valve arranged within the piston e, as usual, and provided with the valve-stem h, passing through a stuffing-box at the upper end of the hollow piston-rod e, and hinged or otherwise connected in its upper end to the intermediate lever, G, as shown in Fig. 1.

1n the modification shown in Fig. 2 the lever G is connected to lever B and to valve-stem h, as in Fig. l; but instead of being hung on a movable fulcrum on the piston-rod c it is hung on a stationary fulcrum, z, located between the outer end of said intermediate lever, G, and the regulator-cylinder E, such fulcrum being preferably made in the upper end of a standard, I, secured to bracket D, or in any other stationary part of the device.

The operation of my invention is as follows: The regulator is set so that the damper f will be half open, or nearly so, at the pressure desired. Should the pressure in the steam-generator increase or diminish,-the main lever B on the pressure device will gradually rise or fall, carrying the intermediate lever, G, with it, which operates the valve of the automatic regulator, causing the damper f to close or open gradually as the pressure rises or falls. For example, should I desire to carry a pressure of, say, seventy pounds to the square inch in the steam-generator, the weight B on the main lever B of the pressure device will be adjusted accordingly, to balance said pressure, or nearly so. Then by means of the weight G on the intermediate lever, G, I adjust it so that the damper f will commence to close at a pressure slightly under said pressure, gradually closing as the pressure increases, arriving at half-closed, or nearly so, at seventy pounds pressure, thereby reducing the draft gradually, and consequently the heat in the furnace, which has a tendency to prevent the pressure from rising above the desired pressure. Shouldthepressure continue to rise above seventy pounds, the damper will continue to close gradually until, at a pressure slightly above seventy pounds,it will have fully closed. As the pressure gradually descends, the damper will gradually open, arriving at halfopen, or nearly so, at seventy pounds pressure. Should the pressure still continue to fall below seventy pounds, the damper will continue to open, arriving at full-open, or nearly so, at a pressure slightly below seventy pounds. It will be plainly seen that a regulator operating a damper in this manner will hold the damper open just enough to keep the pressure normal, or nearly so, in the steam-generator.

It must be kept in mind that the normal condition of the automatic damper-regulator is to hold the damper half open, or nearly so, at the desired pressure, closing as the pressure increases and opening as the pressure decreases in the steam-generator.

By the employment of the said intermediate lever, G, it will be seen that I relieve the main lever B of the pressure device of most of its frictional resistance, and that such frictional resistance is reduced in proportion to the length of such lever G.

What I wish to secure by Letters Patent, and claim, is

1. In an automatic damper-regulator, the intermediate lever, G, connected to the pressure-lever B and to the valve-stem h of the regulator-cylinder E, as and for the purpose set forth.

2. In an automatic damper regulator, a pressure device with its lever B connected to the intermediate lever, G, the latter being suspended upon the movable piston-rod e and connected to the valve-rod h, as and for the purpose set forth.

3. In an automatic damper-regulator, a pressure device and an adjustable damper, combined with a regulator having one end of its piston connected to the damper, the other end of said piston jointed to the intermediate lever, G, the latter being connected to the main lever B of the pressure device and to the valve of the regulator as and for In testimony whereof I have affixed my sigthe purpose set forth. nature in presence of two witnesses.

4. In an automatic damper-regulator the intermediate lever, G, connected to the press JOHN SPENCER 5 lire-lever B and to the piston-rod e and valve- \Vitnesses:

stein h of the regulator-cylinder E, as and for ALBAN ANDREN, the purpose set forth. FRED. O. CONVERSE.

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