US2122640A - Draft stabilizer - Google Patents

Description

Patented July 5, 1938 PATENT OFFICE DRAFT STABILIZER Edward A. Field and Edward A. Field, Jr.,

' Chicago, Ill.

, Application July 26, 1935, Serial No. 33,242

Claims. (Cl. 236-45) Our present improvements are especially designed by us for embodiment in the draft stabilizer of Letters Patent No. 1,855,228, issued to us April 26, 1932, and No. 1,873,567 issued to us August 23, 1932, and we have illustrated them as so embodied.

The main object of the invention is to provide a draft stabilizer well adapted for use in large power plants which is highly effective and not likely to become clogged or rendered inaccurate by accumulations of dust or ash on the control gate or other parts.

A further object is to provide a stabilizer apparatus having these advantages which is very simple and economical in its parts.

Objects relating to details and economies of our invention will appear from the description to follow. The invention-is defined and pointed out in the claims.

A structure which is a preferred embodiment of our invention is illustrated in the accompanying drawing, in which:

Fig. 1 is a view of a draft stabilizer embodying our invention, the stabilizer housing and breeching with which it is associated being shown in vertical transverse section.

Fig. 2 is a fragmentary front perspective view with the gate and its counterbalance omitted.

In the accompanying drawing, I represents the breeching of a power plant or heating system, the direction of flow therein being indicated by the arrow 2. The breeching has an opening 3 in one side wall thereof.

The stabilizer housing 4 is mounted on the side of the breeching as by means of the clamps 5, this housing being provided with an inlet opening 6 and an outlet opening 1 registering with the opening 3 in the breeching wall.

The stabilizer gate or damper 8 is provided with a pivot member 9 rockingly or pivotally supported on the ledge-like member H1 at the bottom of the inlet opening, this being in the structure illustrated a part of an angle iron frame surrounding the opening. The gate is thus supported to swing inwardly in opening and its upper end is substantially spaced from the top of the stabilizer housing.

The gate is provided with a downwardly projecting arm I i on which is mounted a supporting frame l2 for the adjustable weight indicated at 13. This weight is shifted along the supporting frame by means of the screw l4 driven from the motor l5. The automatic control mechanism for the motor is preferably that shown in our said 1 Patent No. 1,855,228 and is, therefore, not further illustrated and described herein.

The counterbalance is so arranged in relation to the gate that the degree of opening of the gate varies substantially in accordance with the variation of draft therefor, thus maintaining a substantially constant draft in the firebox. The "relation of the counterweight and gate is substantially that described and claimed in our Patent No. 1,783,418, issued December 2, 1930.

At the bottom of the outlet opening of the stabilizer housing, we provide a shelf I6 disposed parallel to the top of the housing and between this shelf and the top of the housing we dispose a plurality of louvers ll, these louvers being inclined in thedirection of flow of the flow within the breeching. In the embodiment illustrated, there is a space 3 of greater width than the spaces between the louvers, this space 18 being at the rear end of the opening relative to the direction of flow within the breeching. There is no necessity for louvers at this point because of the fact that there is always an inward flow of air at this location. In a housing unprovided with louvers, the smoke will eddy into the housing at the side nearest the boiler or furnace, but as long as the gate of the control housing is open even a slight amount, the air passing the gate tends to crowd over to the side of the housing farthest from the boiler; i. e., it tends to pass through the space 18; and this flow of air will prevent the entrance of smoke at that point. The louver blades are provided to prevent entrance of smoke throughout the rest of the area of the opening and are very effective, especially when the amount of air entering the housing through the gate is small.

This particular arrangement of louvers with the wider space described results in a very efficient operation, the deposit of soot or cinders or ash within the housing and on the gate being very effectively prevented.

We have illustrated and described our improvements in a highly practical embodiment. We have not attempted to illustrate or describe other embodiments or adaptations as we believe this disclosure will enable those skilled in the art to embody or adapt our improvements as may be desired.

Having thus described our invention, What we claim as new and desire to secure by Letters Patent, is:

1. In a draft stabilizer, the combination with a breeching having a side opening therein, of a stabilizer housing having an inlet opening in its front wall and an outlet opening in its rear wall registering with said opening in said breeching,

there being a shelf projecting into the housing at the bottom of the outlet opening, a plurality of vertically disposed spaced louvers disposed within the stabilizer housing between said shelf 'and'the top of the housing, the louvers being inclined in the direction of flow within the breeching, there being a space at the rear end of the opening relative to the flow within the breeching of greater width than the spaces between the louvers, and a counterbalanced gate for said inlet opening pivoted at its lower end to swing inwardly in opening, the upper end of the. gate being substantially below the top of the housing and the upper ends of the louvers.

2. In a draft stabilizer, the combination with a breeching having a side opening therein, of a stabilizer housing having an inlet opening in its front wall and an outlet opening in its rear wall registering with said opening in said breech ing, there being a shelf projecting into the housing at the bottom of the outlet opening, a plurality of vertically disposed spaced louvers disposed within the stabilizer housing between said shelf and the top of the housing, the louvers being inclined in the direction of flow within the breeching, and a counterbalanced gate for said inlet opening pivoted at its lower end to swin inwardly in opening, the upper end of the gate being substantially below the top of the housing and the upper ends of the louvers.

3. In a draft stabilizer, the combination with a breeching having a side opening therein, of a stasaid outlet opening disposed within the stabilizer housing, the louvers being inclined in the direction of flow within the breeching, there being a space at the rear end of the opening relative to the flow within the breeching of greater width than the spaces between the louvers, and a counterbalanced gate for said inlet opening pivoted at its lower end to swing inwardly in opening.

4. In a draft stabilizer, the combination with a horizontally disposed breeching having a side opening therein, of a stabilizer housing having an inlet opening in its front wall and an outlet opening in its rear wall registering with said opening in said breeching, a plurality of vertically disposed louvers Within said housing with their edges substantially flush with the breeching opening, the louvers being inclined toward the breeching and in the direction of flow within the breeching, and a counterbalanced gate for said inlet opening pivoted at its lower end to swing inwardly in opening. 7

5. In a draft stabilizer, the combination with a breeching having a side opening therein, of a stabilizer housing having an inlet opening in its front wall provided with a draft responsive inlet gate and an outlet opening in its rear wall registering with said breeching opening, and a plurality of substantially parallel louvers within said housing with their rear edges closely adjacent to the breeching opening, the louvers being inclined toward the breeching and in the direction of flow within the breeching.

EDWARD A. FIELD. EDWARD A. FIELD, JR.

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