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Exhaust stack damper control
| Details |
Inventors: Feinberg, Emanuel;
Assignee: Paragon Resources, Inc. (Southfield, MI)
Primary Examiner: Dority, Jr.; Carroll B.
Assistant Examiner:
Attorney, Agent or Firm: Krass & Young
In a fuel-burning device having a combustion chamber, a burner with a control, an exhaust stack connected to said chamber, an air diverter in said stack and a thermostat connected to said burner control; the improvement which comprises a damper section in the stack downstream of the diverter. The damper is disposed within and journalled upon bearings attached to the damper section. A motor on the damper section has an output shaft connected to the damper and includes a rotary switch on said shaft. An electrical circuit includes a relay switch interconnecting the thermostat, burner control, motor and rotary switch. The motor output shaft is intermittently rotatable through successive arcs of 90.degree., through 360.degree., whereby the damper normally closes the stack preventing escape of room air therethrough when the burner is not operating. The thermostat, when calling for heat, closes the circuit to the motor rotating the damper 90.degree. to open position and successively energizing the burner. The thermostat, when no longer calling for heat, closes a portion of the circuit activating the motor causing rotation of the damper an additional 90.degree. in the same direction to stack closing position and to successively deenergize said burner after the damper and rotary switch have rotated several degrees. The damper has a weight biasing it to open position. A fusible link interconnects the motor output shaft and damper whereby, if the burner fails to shut off with the damper closed, hot exhaust gases fuse the link and the damper rotates automatically to open position. |
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DETAILED DESCRIPTION OF THE INVENTION Referring to the drawing, FIG.
1, a heat exchanger is schematically illustrated at 11, including combustion chamber 12, exhaust pipe 13, stack or vent pipe 15, and air diverter 17.
Within the combustion chamber is a conventional burner 19 having suitable burner controls.
Damper section 21 is interposed in said stack downstream of air diverter 17, and is suitably connected to the smaller diameter exhaust pipe 15 by the taper fittings 23, above and below said damper section.
The damper section includes cylindrical housing 25 having an outwardly spaced concentric double wall 27 with spacers 29 interposed.
Damper 31, FIGS.
1 and 2, is loosely interposed within said housing and loosely journalled therein, as best shown in FIG.
2.
Outer bearings 33 upon opposite sides of the damper section are disposed through corresponding apertures within cylindrical housing 25 and the outer double wall 27.
Said bearings include annular notches 35 which anchor the bearings in alignment within said outer wall.
Inner bearing 37 has a central aperture and is journalled within bearing 33 and has a pair of upright slots 39 upon its inner portion which receive adjacent portions of the damper.
Annular shoulder 40 on the inner bearing retainingly engages an inner portion of the outer bearing 33.
The opposed inner bearing 42 is loosely journalled within the corresponding outer bearing 33 and at its inner end, projects into said damper and through its slots 39 retainingly engages the damper, for rotation therewith.
By this construction, damper 31 is loosely journalled within the outer spaced bearings 33.
As shown in FIG.
2, upon one side of the damper, there is an enlarged opening 41 within which is loosely nested the fusible link 43.
Said link is square in cross section, and as an illustration only, may be made of solder, lead, antimony or bismuth or a combination thereof.
Said link at one end nests within one end of square metal sleeve 44.
The other end of said sleeve is slotted at 46 and snugly receives an adjacent portion of damper 31 in driving relation
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