US3386720A - Metal-coating furnace - Google Patents
Metal-coating furnace Download PDFInfo
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- US3386720A US3386720A US349027A US34902764A US3386720A US 3386720 A US3386720 A US 3386720A US 349027 A US349027 A US 349027A US 34902764 A US34902764 A US 34902764A US 3386720 A US3386720 A US 3386720A
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- foundation
- trough
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- metal
- channels
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Links
- 239000011248 coating agent Substances 0.000 title description 7
- 238000000576 coating method Methods 0.000 title description 7
- 238000001816 cooling Methods 0.000 description 18
- 229910052751 metal Inorganic materials 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 8
- 229910052725 zinc Inorganic materials 0.000 description 8
- 239000011701 zinc Substances 0.000 description 8
- 229910052782 aluminium Inorganic materials 0.000 description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 239000002826 coolant Substances 0.000 description 7
- 239000012809 cooling fluid Substances 0.000 description 7
- 239000010410 layer Substances 0.000 description 7
- 229910010293 ceramic material Inorganic materials 0.000 description 5
- 238000007598 dipping method Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 239000012530 fluid Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005246 galvanizing Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 238000006219 Matteson homologation reaction Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000003618 dip coating Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/50—Controlling or regulating the coating processes
- C23C2/52—Controlling or regulating the coating processes with means for measuring or sensing
- C23C2/522—Temperature of the bath
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C2/00—Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
- C23C2/003—Apparatus
- C23C2/0036—Crucibles
Definitions
- ABSTRAQT 6F THE DiSfILGSURE A furnace for the zinc and aluminum dip-coating of sheet-metal whose upwardly open trough is heated by a mantle disposed above and close to the surface of the melt but which has a separate foundation in coextensive contact with the trough and provided with cooling ducts through which a liquid is circulated.
- the trough is maintained at a temperature of about 550 C. and the cooling fluid is circulated through the concrete foundation so as to maintain the temperature therewithin at a level between 80 and 90 C.
- My present invention relates to metal-coating furnaces or ovens and, more particularly, to zinc and aluminum furnaces for the so-called hot dipping of metallic sheets in galvanizing processes or the like operating with molten metals.
- Furnaces for the hot dipping or galvanizing of metallic sheets with aluminum or zinc protective layers generally comprise a refractory trough for the molten zinc or aluminum through which the sheet metal is passed and which may be heated from above with the aid of burners or the like.
- a pan or trough which is composed of a ceramic material in the form of bricks, blocks or the like and an insulating layer, also of ceramic material, surrounding the trough, the entire trough structure being mounted upon a foundation of concrete or the like.
- Such furnaces can be operated for uninterrupted stretches ranging from months to years and have been characterized heretofore by the formation in the masonry wall of the trough of crevices and spalling, the melt penetrating into the crevices and recesses and further accelerating the deterioration of the wall of the trough.
- these earlier structures are also characterized by a settling of the foundation, especially when the latter is supported in sandy soils, apparently as a consequence of the desiccation of the surrounding ground by the high temperatrues of the foundation.
- Both the r aforementioned disadvantages have been discovered to be derived from an excessive heat transfer from the moltenmetal trough to the concrete foundation.
- a further object of this invention is to provide a furnace of the character described wherein excessive heat transfer from the trough to the foundation is prevented.
- the foundation can be provided with a plurality of cooling channels in the form of canals formed integrally in the concrete foundation or 3,3%,?2d Patented June 4, 1968 the tubes embedded therein, the tubes being provided with means for supplying the cooling fluid to them and removing the cooling fluid therefrom.
- the longtiudinally extending furnace is mounted upon and partly in a foundation formed with an array of lineal cooling channels below the interface of the foundation and the molten-metal trough, the cooling channels extending generally transversely of the major dimension (i.e. the longitudinal direction) of the trough and communicating at their extremities with inlet and outlet manifold means extending longitudinally in the foundation.
- the cooling channels may include a multiplicity of parallel tubes or canals formed in the concrete foundation and a pair of conduits at the opposite extremities of the cooling channels extending perpendicularly thereto for supplying the gaseous or liquid medium to the channels and removing the medium therefrom.
- the cooling channels extend substantially parallel to the general direction of flow of the cooling medium.
- the channels themselves may be passages formed upon the casting of the concrete foundation or tubes embedded therein, whereas the inlet and outlet conduits are preferably troughs integrally provided in the concrete foundation and, if desired, formed with inlet and/or outlet tubes passing through a cover portion overlying the inlet and outlet troughs.
- the array of parallel cooling channels should consist of individual passages whose diameter (inner diameter of the tubes) and the spacing of the channels one from the other are in the ratio of substantially 1:3 to 1:5 and the distance of the array from the interface of the foundation and the molten metal trough is in a ratio with the diameter of the cooling passages of substantially 1:1 to 2:1.
- the inlet and/or outlet tubes are provided with flowcontrol means adapted to regulate the rate at which the cooling fluid is passed through the cooling channels.
- a temperature-responsive means is located in heat-exchanging relationship with the molten-metal trough and preferably is disposed between the array of cooling passages and the interface between the molten-metal-trough structure and the foundation while circuit means controlled by the temperaturesensitive device is provided for operating the flow-control. means to maintain a substantially constant temperature of the formation as previously described.
- the trough walls have been found to have a usable life ranging upwardly from 10% greater than the usable life of the walls of troughs whose foundations are not provided with cooling means of the character described.
- FIG. 1 is a transverse cross-sectional view through a hot-dipping metal-coating furnace according to the present invention
- PEG. 2 is a longitudinal cross-sectional view taken along the line 11-11 of FIG. 1.
- I show a furnace for the hot-dipping of metals which comprises a trough 2 composed of blocks of a ceramic material and containing a molten-metal bath 3 which can be zinc or aluminum.
- the bath is surmounted by a cover in the form of a downwardly open semicylindrical heating mantle 4 in whose cavity 4 a combustion of hydrocarbon gases can be carried out at a burner for obtaining the temperature necessary to maintain the metal within the trough in a molten state.
- the mantle 4 is composed of a refractory material and is, in turn, covered by an insulating layer 4a.
- the masonry trough is provided with an insulating layer 1 also of ceramic material, the layer being supported laterally by the metallic channel-shaped walls 1.
- the trough 2 and its insulating layer 1 rest upon the concrete foundation 5 with which it forms an interface 5', across which a heat transfer takes place between the trough structure ll, 2 and the concrete foundation.
- the layer surrounds a planar array of tubes 6 embedded in the concrete of the foundation, these tubes extending transversely to the major or longitudinal dimension of the furnace and constituting spaced but parallel cooling channels.
- the metallic sheet material to be coated may be passed through the bath 3 as indicated by dot-dash lines in FIG. 1 which represent the means for passing the sheet material through the bath.
- the concrete foundation 5 is surrounded by a steel supporting structure 5" and is formed with a pair of longitudinally extending conduit troughs or channels '7, 7' serving as the inlet and outlet manifolds for the tubes 6 with which they communicate, respectively.
- the outlet channel '7' can be covered with a grate 9 to permit the escape of air or other gaseous fluids when this medium serves for cooling of the foundation and/or provided with an overflow pipe 10 for discharging liquid coolants from the canal.
- the mouth or outlet for the fluid from the channel 7 is disposed above the tubes e and, preferably, above the interface 5.
- the grate extends the full length of the trough 7 so that there is little impediment to the escape of coolants.
- a thermostatic device if, e.g. in the form of a pyrometer, is provided with a sensing element 11' intermediate the array of pipes 6 and the interface 5"; this temperaturesensitive device can serve to energize a relay 11 which, when activated, electrically operates a valve 8' in the coolant supply pipe 8 for controllin the passage of the coolant through the pipes 6; other control means can, of course, also be provided.
- Example A furnace for the galvanizing of iron parts by hot dipping in molten zinc and of the general construction illustrated in FIGS. 1 and 2 is maintained at a temperature of approximately 450 C. by combustion of gases Within the heating mantle 4 in the usual manner.
- the tubes 6 each have an inner diameter of 5-6 cm. and are spaced apart by a distance of 4 cm. below the interface 5.
- Five tubes are provided per meter of length of the trough structure 1, 2 and the tubes are embedded in the concrete.
- a thermostat having this sensing element disposed between the pipes 6 and the interface 5 is set at 85 C. (:L-S" C.) and controls a valve which starts and stops the flow of water to the pipes at a pressure of 3 kg./ cm.-, the water being at a temperature of 15 C.
- a furnace for the hot coating of sheet metal with a bath of zinc or aluminum comprising a foundation, a ceramic trough structure mounted directly on and in co extensive contact with said foundation while being partly received therein, a cover partly overlying said trough and lying close to the surface of a static molten-metal bath therein, means in said cover for heating said bath, means for passing sheet metal through said bath for coating with the molten metal thereof, cooling means including a plurality of channels formed in said foundation for passing a cooling fluid through at least a portion of said foundation for reducing the temperature of said foundation below that of said trough, inlet means for supplying said fluid to said channels and outlet means for discharging said fluid from said channels.
- a furnace as defined in claim 2 wherein said trough extends longitudinally along said foundation and said passages extend transversely thereto, said manifolds extending longitudinally in said foundation and communicating with said passages for directing said cooling fluid transversely to said trough.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating With Molten Metal (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Description
June 4, 1968 K. FRITZ METAL-COATING FURNACE Filed March 3, 1964 KARL FRITZ INVENTOR.
Fig.2
BY .zualzm, was: 6' flail"! 3,336,720 METAL-CQATING FURNACE Karl Fritz, Feithstrasse 25, Hagen, Germany Filed Mar. 3, 1%4, Ser. No. 349,027 Claims priority, application Germany, Mar. 8, 1953,
39,195 8 Claims. (6i. 263-44) ABSTRAQT 6F THE DiSfILGSURE A furnace for the zinc and aluminum dip-coating of sheet-metal whose upwardly open trough is heated by a mantle disposed above and close to the surface of the melt but which has a separate foundation in coextensive contact with the trough and provided with cooling ducts through which a liquid is circulated. The trough is maintained at a temperature of about 550 C. and the cooling fluid is circulated through the concrete foundation so as to maintain the temperature therewithin at a level between 80 and 90 C.
My present invention relates to metal-coating furnaces or ovens and, more particularly, to zinc and aluminum furnaces for the so-called hot dipping of metallic sheets in galvanizing processes or the like operating with molten metals.
Furnaces for the hot dipping or galvanizing of metallic sheets with aluminum or zinc protective layers generally comprise a refractory trough for the molten zinc or aluminum through which the sheet metal is passed and which may be heated from above with the aid of burners or the like. For the most part, such furnaces have a pan or trough which is composed of a ceramic material in the form of bricks, blocks or the like and an insulating layer, also of ceramic material, surrounding the trough, the entire trough structure being mounted upon a foundation of concrete or the like. Such furnaces can be operated for uninterrupted stretches ranging from months to years and have been characterized heretofore by the formation in the masonry wall of the trough of crevices and spalling, the melt penetrating into the crevices and recesses and further accelerating the deterioration of the wall of the trough. Moreover, these earlier structures are also characterized by a settling of the foundation, especially when the latter is supported in sandy soils, apparently as a consequence of the desiccation of the surrounding ground by the high temperatrues of the foundation. Both the r aforementioned disadvantages have been discovered to be derived from an excessive heat transfer from the moltenmetal trough to the concrete foundation.
It is the principal object of the present invention, therefore, to provide a method of operating a metal-coating furnace wherein the aforementioned disadvantages can be avoided and the heating of the concrete foundation of the furnace to high temperatures can be prevented.
A further object of this invention is to provide a furnace of the character described wherein excessive heat transfer from the trough to the foundation is prevented.
I have found that foregoing disadvantages of earlier structures can be eliminated when excessive heat transfer to the foundation in such manner as to elevate its temperature above a predetermined maximum level is avoided by a method which involves the cooling of the foundation with liquid or gaseous cooling medium to a emperature which does not exceed 100 C. and which preferably is below this temperature, i.e. between 80 and 100 C. For this purpose, the foundation can be provided with a plurality of cooling channels in the form of canals formed integrally in the concrete foundation or 3,3%,?2d Patented June 4, 1968 the tubes embedded therein, the tubes being provided with means for supplying the cooling fluid to them and removing the cooling fluid therefrom.
According to a more specific feature of the present invention, the longtiudinally extending furnace is mounted upon and partly in a foundation formed with an array of lineal cooling channels below the interface of the foundation and the molten-metal trough, the cooling channels extending generally transversely of the major dimension (i.e. the longitudinal direction) of the trough and communicating at their extremities with inlet and outlet manifold means extending longitudinally in the foundation. Thus, the cooling channels may include a multiplicity of parallel tubes or canals formed in the concrete foundation and a pair of conduits at the opposite extremities of the cooling channels extending perpendicularly thereto for supplying the gaseous or liquid medium to the channels and removing the medium therefrom. In general, it has been found to be advisable that the cooling channels extend substantially parallel to the general direction of flow of the cooling medium. The channels themselves may be passages formed upon the casting of the concrete foundation or tubes embedded therein, whereas the inlet and outlet conduits are preferably troughs integrally provided in the concrete foundation and, if desired, formed with inlet and/or outlet tubes passing through a cover portion overlying the inlet and outlet troughs.
I have found that, surprisingly, certain essential critical relationships between the diameters of the cooling channels and their spacing must be observed if optimum cooling of the foundation is to be obtained. Thus, it may be noted that the array of parallel cooling channels should consist of individual passages whose diameter (inner diameter of the tubes) and the spacing of the channels one from the other are in the ratio of substantially 1:3 to 1:5 and the distance of the array from the interface of the foundation and the molten metal trough is in a ratio with the diameter of the cooling passages of substantially 1:1 to 2:1.
According to a further feature of the present invention the inlet and/or outlet tubes are provided with flowcontrol means adapted to regulate the rate at which the cooling fluid is passed through the cooling channels. A temperature-responsive means is located in heat-exchanging relationship with the molten-metal trough and preferably is disposed between the array of cooling passages and the interface between the molten-metal-trough structure and the foundation while circuit means controlled by the temperaturesensitive device is provided for operating the flow-control. means to maintain a substantially constant temperature of the formation as previously described.
When the measures described above are taken, there is found to be little desiccation of the ground supporting the foundation so that no settling of the furnace occurs for the most part. Moreover, spa ling of the molten-metaltrough masonry is substantially reduced as is the tendency toward the formation of crevices and the penetration of molten metal into these crevices. In general, the trough walls have been found to have a usable life ranging upwardly from 10% greater than the usable life of the walls of troughs whose foundations are not provided with cooling means of the character described.
The above and other objects, features and advantages of the present invention will become more readily apparent from the following description, reference being made to the accompanying rawing in which:
FIG. 1 is a transverse cross-sectional view through a hot-dipping metal-coating furnace according to the present invention;
PEG. 2 is a longitudinal cross-sectional view taken along the line 11-11 of FIG. 1.
In the drawing, I show a furnace for the hot-dipping of metals which comprises a trough 2 composed of blocks of a ceramic material and containing a molten-metal bath 3 which can be zinc or aluminum. The bath is surmounted by a cover in the form of a downwardly open semicylindrical heating mantle 4 in whose cavity 4 a combustion of hydrocarbon gases can be carried out at a burner for obtaining the temperature necessary to maintain the metal within the trough in a molten state. The mantle 4 is composed of a refractory material and is, in turn, covered by an insulating layer 4a.
The masonry trough is provided with an insulating layer 1 also of ceramic material, the layer being supported laterally by the metallic channel-shaped walls 1. The trough 2 and its insulating layer 1 rest upon the concrete foundation 5 with which it forms an interface 5', across which a heat transfer takes place between the trough structure ll, 2 and the concrete foundation. The layer surrounds a planar array of tubes 6 embedded in the concrete of the foundation, these tubes extending transversely to the major or longitudinal dimension of the furnace and constituting spaced but parallel cooling channels. The metallic sheet material to be coated may be passed through the bath 3 as indicated by dot-dash lines in FIG. 1 which represent the means for passing the sheet material through the bath.
The concrete foundation 5 is surrounded by a steel supporting structure 5" and is formed with a pair of longitudinally extending conduit troughs or channels '7, 7' serving as the inlet and outlet manifolds for the tubes 6 with which they communicate, respectively. The outlet channel '7' can be covered with a grate 9 to permit the escape of air or other gaseous fluids when this medium serves for cooling of the foundation and/or provided with an overflow pipe 10 for discharging liquid coolants from the canal. It may be noted that, in either case, the mouth or outlet for the fluid from the channel 7 is disposed above the tubes e and, preferably, above the interface 5. The grate extends the full length of the trough 7 so that there is little impediment to the escape of coolants.
A thermostatic device if, e.g. in the form of a pyrometer, is provided with a sensing element 11' intermediate the array of pipes 6 and the interface 5"; this temperaturesensitive device can serve to energize a relay 11 which, when activated, electrically operates a valve 8' in the coolant supply pipe 8 for controllin the passage of the coolant through the pipes 6; other control means can, of course, also be provided.
Example A furnace for the galvanizing of iron parts by hot dipping in molten zinc and of the general construction illustrated in FIGS. 1 and 2 is maintained at a temperature of approximately 450 C. by combustion of gases Within the heating mantle 4 in the usual manner. The tubes 6 each have an inner diameter of 5-6 cm. and are spaced apart by a distance of 4 cm. below the interface 5. Five tubes are provided per meter of length of the trough structure 1, 2 and the tubes are embedded in the concrete. A thermostat having this sensing element disposed between the pipes 6 and the interface 5 is set at 85 C. (:L-S" C.) and controls a valve which starts and stops the flow of water to the pipes at a pressure of 3 kg./ cm.-, the water being at a temperature of 15 C. (15 C.) prior to introduction at the inlet pipe. Temperatures taken by means of thermocouples within the concrete mass show that its temperature ranges between 80 and 90 C.; there is no settling of the foundation. When a similar furnace without coolant tubes is employed, the walls 2 and 5 of the trough structure receive, in case of settlement of the foundation, cracks and liquid zinc or aluminum flows out.
The invention described and illustrated is believed to admit of many modifications within the ability of persons skilled in the art, all such modifications being considered within the spirit and scope of the appended claims.
i claim:
1. A furnace for the hot coating of sheet metal with a bath of zinc or aluminum comprising a foundation, a ceramic trough structure mounted directly on and in co extensive contact with said foundation while being partly received therein, a cover partly overlying said trough and lying close to the surface of a static molten-metal bath therein, means in said cover for heating said bath, means for passing sheet metal through said bath for coating with the molten metal thereof, cooling means including a plurality of channels formed in said foundation for passing a cooling fluid through at least a portion of said foundation for reducing the temperature of said foundation below that of said trough, inlet means for supplying said fluid to said channels and outlet means for discharging said fluid from said channels.
2. A furnace as defined in claim 1 wherein said foundation is composed of concrete and said trough structure includes a ceramic trough-forming portion and an insulating layer of ceramic material interposed between said trough-forming portion and said foundation, said channels forming a generally planar array of substantially parallel passages, said inlet and outlet means including respec ive manifolds communicating with said passages.
3. A furnace as defined in claim 2 wherein said channels are tubes embedded in the concrete foundation.
4. A furnace as defined in claim 2 wherein said channels are passages molded into said concrete foundation.
5. A furnace as defined in claim 2 wherein said trough extends longitudinally along said foundation and said passages extend transversely thereto, said manifolds extending longitudinally in said foundation and communicating with said passages for directing said cooling fluid transversely to said trough.
d. A furnace as defined in claim 5 wherein said passages are of substantially equal diameter and the diameter of said passages is in a ratio to the spacing of adjacent channels from one another of substantially 1.3 to 1.5.
7. A furnace as defined in claim 6 wherein said trough structure and said foundation have a common interface extending substantially parallel to said array of channels, the distance between said array of channels and said interface being in a ratio to said diameter of substantially 1:1 to 2:1.
8. A furnace as defined in claim 7, further comprising control means connected with at least one of said manifolds and temperature-sensitive means in heat-exchanging relationship with said trough structure and operatively connected with said control means for regulating the flow of cooling fluid through said passages to maintain a substantially constant temperature of said foundation, said temperature-sensitive means being provided with a thermally responsive element disposed between said surface and said array, said control means including valve means and an electric circuit provided with relay means for operating said valve means, said element being a pyrometer connected in circuit with said relay means.
References Cited UNITED STATES PATENTS 1,047,521 12/1912 Hcrreshoif 263-44 2,199,355 4/1940 Underwood 26344 2,514,871 7/1950 Jordan 263-44 2,671,658 3/1954 Moore 263-44 X FREDERICK L. MATTESON, Jrc, Primary Examiner.
D. A. TAMBURRO, A. D. HERRMANN,
Assistant Examiners.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEF0039195 | 1963-03-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3386720A true US3386720A (en) | 1968-06-04 |
Family
ID=7097666
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US349027A Expired - Lifetime US3386720A (en) | 1963-03-08 | 1964-03-03 | Metal-coating furnace |
Country Status (4)
Country | Link |
---|---|
US (1) | US3386720A (en) |
CH (1) | CH418086A (en) |
GB (1) | GB977376A (en) |
NL (1) | NL6400618A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3652070A (en) * | 1968-10-22 | 1972-03-28 | Mitsubishi Heavy Ind Ltd | Cooling assembly for blast furnace shells |
US3858861A (en) * | 1974-01-17 | 1975-01-07 | United States Steel Corp | Underhearth cooling system |
US3873074A (en) * | 1973-03-26 | 1975-03-25 | Berry Metal Co | Converter-bottom for bottom-blow steel making process |
US4637593A (en) * | 1985-08-09 | 1987-01-20 | Yinko Sr Richard H | Ladle cup for pouring molten metal |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1047521A (en) * | 1909-07-28 | 1912-12-17 | Nichols Copper Co | Reverberatory furnace. |
US2199355A (en) * | 1937-06-17 | 1940-04-30 | Hartford Empire Co | Means for and method of cooling glass tank walls |
US2514871A (en) * | 1947-05-03 | 1950-07-11 | Jordan Res Lab Inc | Furnace hearth |
US2671658A (en) * | 1951-02-14 | 1954-03-09 | Meehanite Metal Corp | Metal lined cupola |
-
1963
- 1963-05-16 GB GB19434/63A patent/GB977376A/en not_active Expired
- 1963-12-20 CH CH1557263A patent/CH418086A/en unknown
-
1964
- 1964-01-27 NL NL6400618A patent/NL6400618A/xx unknown
- 1964-03-03 US US349027A patent/US3386720A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1047521A (en) * | 1909-07-28 | 1912-12-17 | Nichols Copper Co | Reverberatory furnace. |
US2199355A (en) * | 1937-06-17 | 1940-04-30 | Hartford Empire Co | Means for and method of cooling glass tank walls |
US2514871A (en) * | 1947-05-03 | 1950-07-11 | Jordan Res Lab Inc | Furnace hearth |
US2671658A (en) * | 1951-02-14 | 1954-03-09 | Meehanite Metal Corp | Metal lined cupola |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3652070A (en) * | 1968-10-22 | 1972-03-28 | Mitsubishi Heavy Ind Ltd | Cooling assembly for blast furnace shells |
US3873074A (en) * | 1973-03-26 | 1975-03-25 | Berry Metal Co | Converter-bottom for bottom-blow steel making process |
US3858861A (en) * | 1974-01-17 | 1975-01-07 | United States Steel Corp | Underhearth cooling system |
US4637593A (en) * | 1985-08-09 | 1987-01-20 | Yinko Sr Richard H | Ladle cup for pouring molten metal |
Also Published As
Publication number | Publication date |
---|---|
GB977376A (en) | 1964-12-09 |
CH418086A (en) | 1966-07-31 |
NL6400618A (en) | 1964-09-09 |
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