Claims
- 1. A bell-shaped furnace for the heat treatment of metal coils, said furnace comprising:an inner cover which surrounds the steel coils, a cooling-cover which surrounds the inner cover in a substantially concentrical and spaced relationship thereto to form an intermediate space in between, said cooling cover including a circumferential cooling cover shell and a cooling cover roof, at least one fan means for producing a cooling air flow, conduit means coupled to said fan means and said intermediate space, said conduit means comprising a) a first plurality of air nozzles mounted to said cooling cover shell and arranged in a mutually spaced relationship, said first plurality of air nozzles each having a first nozzle diameter and being configured so that cooling air jet streams are formed in said nozzles, passed into said intermediate space and directed to impinge on said inner cover, adjacent air nozzles disposed in said shell being increasingly spaced from the bottom up for enhancing a cooling of the coils, the spacings of adjacent nozzles of said first plurality of air nozzles varying within a range of 4 to 20 times the nozzle diameter of said first plurality of air nozzles; and b) a second plurality of air nozzles mounted to said cooling cover roof in a mutually spaced relationship, said second plurality of air nozzles each having a second nozzle diameter, passing cooling air produced by said fan means into said intermediate space and being configured so that cooling air jet streams are formed in said nozzles and directed to impinge on said inner cover, adjacent nozzles of said second plurality of air nozzles having spacings in a second range that is 4 to 8 times the nozzle diameter of said second plurality of air nozzles.
- 2. The bell-shaped furnace according to claim 1, wherein the nozzle diameters of the air nozzles of said first plurality and of said second plurality are equal.
- 3. The bell-shaped furnace according to claim 2 wherein the spacings between adjacent nozzles of said first plurality of air nozzles are continuously increased from the bottom up.
- 4. The bell-shaped furnace according to claim 1 wherein the air nozzles of said first plurality of nozzles have a length that is in the range of 3 to 10 times the nozzle diameter.
- 5. The bell-shaped furnace according to claim 1, wherein the air nozzle of said first and second pluralities of air nozzles each have a rounded inlet.
- 6. The bell-shaped furnace according to claim 1 further comprising a substantially ring shaped bottom portion of said cooling cover and a substantially ring shaped upper portion of said cooling cover, said upper portion of said cooling cover having an external diameter that is larger than the external diameter of the bottom portion.
- 7. A bell-shaped furnace for a heat treatment of metal coils, said furnace comprising:an inner cover which surrounds a plurality of associated coils; a cooling cover which surrounds said inner cover in a substantially concentric and spaced relationship to form an intermediate space between said inner cover and said cooling cover; a fan communicating with said intermediate space for producing a cooling air flow; a first plurality of air nozzles located on said cooling cover, the nozzles of said first plurality of air nozzles being spaced from each other and being configured so that cooling air jet streams are formed in said nozzles, said air jet streams passing into said intermediate space and impinging on said inner cover, wherein said air nozzles are disposed in said cooling cover in a manner such that said air nozzles are located closer to each other adjacent a bottom portion of said cooling cover and are located farther from each other adjacent a top portion of said cooling cover thereby enhancing cooling of the coils.
- 8. The bell-shaped furnace of claim 7 wherein adjacent air nozzles of said first plurality of air nozzles are spaced from each other by a distance within a range of approximately 4 to 20 times a nozzle diameter of said first plurality of air nozzles.
- 9. The bell-shaped furnace of claim 7 wherein said cooling cover comprises a cover shell and a cover roof.
- 10. The bell-shaped furnace of claim 9 wherein said first plurality of air nozzles are located on said cover shell and further comprising a second plurality of air nozzles located on said cooling cover roof in a mutually spaced relationship, wherein said cooling air jet streams formed in said second plurality of nozzles are directed to impinge on said inner cover.
- 11. The bell-shaped furnace of claim 10 wherein adjacent nozzles of said second plurality of air nozzles have a spacing that is approximately 4 to 8 times a nozzle diameter of said second plurality of air nozzles.
- 12. The bell-shaped furnace according to claim 11 wherein a nozzle diameter of said air nozzles of said first plurality of air nozzles is equal to a nozzle diameter of said air nozzles of said second plurality of air nozzles.
- 13. The bell-shaped furnace according to claim 7 wherein the spacings between the adjacent nozzles of said first plurality of air nozzles are continuously increased from a bottom portion of said cooling cover to a top portion thereof.
- 14. The bell-shaped furnace according to claim 7 wherein the air nozzles of said first plurality of nozzles have a length that is in the range of approximately 3 to 10 times a nozzle diameter of said first plurality of air nozzles.
- 15. The bell-shaped furnace according to claim 7 wherein the air nozzles of said first plurality of air nozzles each have a rounded inlet.
- 16. The bell-shaped furnace according to claim 7 further comprising a substantially ring-shaped lower portion of said cooling cover and a substantially ring-shaped upper portion of said cooling cover, said upper portion of said cooling cover having an external diameter which is larger than an external diameter of said lower portion.
- 17. A cooling cover for a bell-shaped furnace comprising:a circumferential cooling cover shell having a first axial end and a second axial end; a cooling cover roof connected to the first axial end of the cooling cover shell; a first plurality of air nozzles extending radially inward from said cooling cover shell and arranged in a mutually spaced relationship, adjacent air nozzles being increasingly spaced from the second axial end toward the first axial end; and a second plurality of air nozzles extending downward from said cooling cover roof in a mutually spaced relationship.
Priority Claims (2)
Number |
Date |
Country |
Kind |
197 03 305 |
Jan 1997 |
DE |
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198 03 259 |
Jan 1998 |
DE |
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Parent Case Info
This application is a continuation-in-part of application serial No. PCT/EP 98/00246 which has an international filing date of Jan. 17, 1998, and is still pending.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
5230617 |
Klein et al. |
Jul 1993 |
|
5249960 |
Monroe |
Oct 1993 |
|
5290017 |
Hemsath et al. |
Mar 1994 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
32 33 815 |
Mar 1984 |
DE |
WO 9833946 |
Aug 1998 |
DE |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
PCT/EP98/00246 |
Jan 1998 |
US |
Child |
09/161600 |
|
US |