US 1552100 A
Description (OCR text may contain errors)
Sept. 1, 1925. 1,552,100
S. B. WATERS DAMPER CONTROL 1 ed Dec. 11,, 1923 nililliw Patented Sept. 1, 1925.
UNITED STATES S MU L B- WA E S, T N, FENNSYLV NI DAMPER CONTROL.
Appli ation filed Dec mber .11, 1923- Stria-l No. 679,921.
, To all whom it may concern:
Be it known that I, SAMUEL B. VVATnRs,
a citizen of the United States, residing at J ohnstown, county of Gambria, State of Pennsylvania, have invented a new and useful Improvement in Damper Controls, of which the following is a full, clear, and exact description. This invention relates to damper control and particularly to an improved device for effecting operation of a damper in a predetermined time.
In firing a house-heating boiler or the like, it is desirable to supply additional air to the combustion chamber until the volatile matter is burned from the coal, after which the air supply should be reduced for economical' combustion. The time usually required to burn the volatile matter is about twenty minutes, but this time will of course vary, and provision is made for regulating the closing of the damper in any desired time interval.
I provide a damper control having a liquid chamber of variable volume, a connection with the damper'to be controlled movable in accordance with variations in the chamber volume, and a liquid connection to the chamber having means offering greater resistance to flow in one direction than in the other. Preferably, the apparatus comprises a liquid reservoir with a chamber therebelow and a liquid conduit between the reservoir and the chamber. This conduit is provided with a check valveso that the chamber may be readily increased in volume as the damper is manually opened, after which the valve seats and the closing of the damper is controlled by the increased resistance to the return of the liquid from the chamber to the reservoir. It is desirable to provide a variable resistance, such as a needle valve, together with a sight feed, so that the timing of the damper control may be readily adjusted.
In the accompanying drawings illustrating the present preferred embodimentof the invention- Figure 1 is a side elevation, partly broken away, of a damper control embodying my invention;
Figure 2 is a section on the line IIII of Figure 1; and 7 Figure 3 is a section on the line IIIIII of Figure 2.
In the illustrated embodiment of the in* vention, there is shown an air conduit 2 connected to a furnace (not shown) and having therein adamper 3 of usual construction. This damper is provided with a lever 4 connected to a hand lever 5 by a chain 6. The hand lever 5 is pivoted at 7 and is, provided with a counter-weight 8 I tending to move the damper to closed position, as shown in Figure 1.
The lever 5 is further provided with a handle 9 for opening the damper. When the furnace is fired with a fresh charge of coal, the handle 9 is pulled downwardly, thus opening the damper and providing ad ditional air for the combustion chamber of the furnace.
Bearing on the lever 5 adjacent the pivot 7 is a finger 10 connected to the bottom of an eXpa-nsible diaphragm chamber 11. Immediately above the chamber 11 is areservoir 12 filled with a suitable liquid, such as oil, and connected to the chamber 11 by a conduit 13. A check valve 14: is provided at the upper end of the conduit 13, whereby liquid may enter the chamber 11 through an opening 15, as the handle 9 is pulled downwardly.
When the handle 9 is released, the counterweight 8 tends to return the damper to closed position, but in order to do so it must decrease the volume of the chamber 11 by forcing oil therefrom into the reservoir 12.- The check valve 14: closes on this stroke and the oil takes a path through the conduit 13 and a conduit 16 having a needle valve 17 therein. The needle valve 17 is preferably provided with a sight opening 18, so that the rate at which the oil is returned to the reservoir may be readily noted.
The entire apparatus may be attached to the ceiling, a rafter or other suitable support by spacer bars 19 terminating in an attachment plate 20.
It will be seen that when the handle 9 is pulled downwardly, the oil will flow freely through the check valve 14 and fill the liq uid chamber 11, while on the up stroke, the oil must take the more restricted path through the needle valve 17, and that by regulating this valve, the time required to close the damper may be readily adjusted as desired.
I provide a simple and effective means for controlling a damper, whereby the efficiency of the furnace may be greatly increased without inconvenience on the part of the the preferred embodiment of the invention,
' rection than it will be understood that it is not limited thereto, but may be otherwise embodied within the scope of the following claims.
1. A damper control, including a liquid reservoir, a chamber of variable volume adapted to draw liquid from the reservoir only, the reservoir being of greater volume than the displacement volume of the chamber, a nn t en w th th d p o b 0 trol led movable with variations in the chamber volume, and' a liquid conduit'between the reservoir and the chamber having means offering a greater resistance .to flow in one di- H in the other, substantially as desr be 2.- YA dampe entr i clu ng a iq reservoir, a chamber of variable volume adapted to dra liquid fr m t reservoir e ly, the rese o being of at r volume than the displacement volume of the chambem .cee ee ion w th th amp torbe 0 troll'ed movable with variations in the chamber volume, a check valve for permitting substantiallyunrestricted flow from the reservoir to the chamber, and an adjustable valve for permitting restricted flow from the chamber to the reservoir, substantially as described.
3. A dampercontro'l, including a fluid reservoir, a chamber of variable volume, a connection with the damper to be controlled movable with variations in the chamber volume, a check valve for permitting substantially unobstructed flow from the reservoir to the chamber, adjustable means permitting a restricted flow from the chamber to the reservoir, and a sight feed whereby the rate of flow from the chamber to the reservoir may be readily ascertained, substantially as described.
4. A damper control, including a reservoir, a chamber of variable volume therebelow, a connection with the damper to be controlled movabie with variations in the chamber volume, non-return means permitting free flow from the reservoir to the chamber, a conduit for return flow from the chamber to the reservoir, said conduit terminating above the liquid level in the chamber, and a sight glass in the conduit above the liquid level in the chamber, substantially as described.
In testimony whereof I have hereunto set my hand.
SAMUEL B; WATERS,