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Furnace with draft-limiter and ventilation
| Details |
Inventors: Kutzner, Luitpold; Postenrieder, Erwin;
Assignee: Kutzner; Luitpold (Munich, DE)
Primary Examiner: O'Connor; Daniel J.
Assistant Examiner:
Attorney, Agent or Firm: Toren, McGeady and Stanger
In an exhaust gas duct from a furnace a ventilation opening with a ventilation flap is openable in chronological conjunction with the cut-off of the furnace and it is closable in chronological conjunction with the switching on of the furnace. The ventilation opening is formed by a draft-limiter opening located downstream from the furnace and the ventilation flap is formed by a draft-limiter flap. During a pause in furnace operation, the draft-limiter flap is held in an open position independently of the pressure difference prevailing at the draft-limiter flap. One opening and one flap are eliminated. The draft-limiter flap provides the ventilation function as well as the draft-limiter function. If necessary, it can be installed in a small space together with an exhaust gas flap. |
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DETAILED DESCRIPTION We claim: 1.
Furnace wherein there is connected to the exhaust gas duct after said furnace in the flow direction a ventilation opening with a ventilation flap openable in chronological conjunction with the cut-off of said furnace and closable in chronological conjunction with the switching-on of said furnace, and wherein there is further connected to said exhaust gas duct after said furnace in the flow direction a draft-limiter opening with a draft-limiter flap, whereat said draft-limiter flap is prestressed in the direction of a closing position and is to be opened by the pressure difference incident upon it, p1-p2 (flue draft) between the pressure p2 in said exhaust gas duct and the possibly higher pressure p1 on its outer side, in such a way that when the pressure difference exceeds a predetermined value said draft-limiter flap increasingly opens for the purpose of maintaining a predetermined pressure difference, characterized in that said ventilation opening is formed by said draft-limiter opening (16) and said ventilation flap is formed by said draft-limiter flap (20), whereat said draft-limiter flap (20), during an operating pause of said furnace, is held in an open position independently of said pressure difference (p1-p2) prevailing at said draft-limiter flap (20).
2.
Furnace according to claim 1, characterized in that in the arrangement of an exhaust gas flap in said exhaust gas duct, said flap being opened in chronological correlation with the switching-on of said furnace and being closed in chronological correlation with the cut-off of said furnace, said draft-limiter flap (20) can be coupled with said exhaust gas flap (12) in such a way that said draft-limiter flap (20) is held in an open position independently of said pressure difference (p1-p2) prevailing at said draft-limiter flap (20), when said exhaust gas flap (12) is closed.
3.
Furnace according to claim 2, characterized in that said exhaust gas flap (12) and said draft-limiter opening (16) along with said draft-limiter flap (20) are combined into one structural unit
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