US3813217A - Furnace for the thermic treatment of products supported by a gas cushion - Google Patents
Furnace for the thermic treatment of products supported by a gas cushion Download PDFInfo
- Publication number
- US3813217A US3813217A US00231142A US23114272A US3813217A US 3813217 A US3813217 A US 3813217A US 00231142 A US00231142 A US 00231142A US 23114272 A US23114272 A US 23114272A US 3813217 A US3813217 A US 3813217A
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- US
- United States
- Prior art keywords
- furnace
- hearth
- products
- channel
- gases
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
- F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
- F27B9/2476—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by air cushion
Definitions
- ABSTRACT Thermal treatment oven for products supported by a gas cushion, comprising a hearth provided with passages for the supporting gases, said hearth consisting of contiguous elements assembled longitudinally; the oven comprises, for example, a pushing device, giving the elements of the hearth a slow linear movement along its longitudinal axis.
- This hearth is subjected to mechanical stresses due to its weight and to gas pressure, while it is brought to a high temperature, whereas its porous nature or the presence of holes reduces the mechanical strength thereof.
- the maintenance of the hearth, and its rapid repair therefore, constitute one of the greatest problems in this type of furnace.
- the furnace consists essentially of a channel which a hearth 2, consisting of contiguous elements 3, divides into two parts 4 and 5.
- the contiguous elements 3 are porous or drilled with holes 6 allowing the gases brought at 4 to a pressure greater than that which prevails at 5 to pass.
- heating and gas flow devices which do not form a part of the invention, and are known per se, are not illustrated.
- the drilled or porous hearth 2 crossed by a gas current which constitutes the gas cushion on which the products to be treated move can move, for example, under the effect of a motordriven pusher 9 on the uprights 7 and 8.
- a motordriven pusher 9 on the uprights 7 and 8.
- Devices such as the motor-driven pusher 9 are also known per se, but previously they have been used exclusively with supports for products to be fired in furnaces of a conventional type, without a gas cushion.
- the motor-driven pusher 9 is used to cyclically introduce into the furnace fresh elements 3A, while simultaneously pushing the previously introduced elements 3 towards the outlet end of the furnace.
- the invention proposes to give a simple solution for the problem of surveying the stateand rapid repairing of the hearth, not requiring the stopping of the furnace. Thus, it proposes to ensure continuous operation of such furnaces during very long periods. Lastly, it proposes to prolong-the operating period of the part of the hearth subjected to the severest thermo-mechanical Stresses.
- FIG. 1 shows the entrance zone of the furnace in a longitudinal sectional view.
- FIG. 2 shows it in a transversal sectional view.
- the furnace thus produced enables not only surveying and easy maintenance of the hearth, but also improves the service conditions by limiting the exposure period of the elements forming the hearth in the high thermo-mechanical stress zone, for a same operating period.
- the elements need not occupy the whole width of the furnace, but only a fraction thereof, the furnace com prising, then, one or several low longitudinal walls intended for supporting the edges of the elements which do not rest on its lateral uprights.
- the holes 6 of the contiguous elements canbe oblique in relation to the longitudinal plane of symmetry of the furnace and/or in the direction of the progression of the products subjected to thermal treatment, so as to exert, on these, a centering and/or propelling effect.
- a housing defining a channel
- a hearth enclosed within said housing and dividing said channel into an upper part and a lower part, said hearth comprising a plurality of contiguous elements placed side by side longitudinally in said channel and provided with passages for said gases;
- a furnace as claimed in claim 1 wherein said means for moving said products through said furnace is adapted to move said products at a speed faster than the slow speed at which said mechanical means move the elements of said hearth through said furnace.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Tunnel Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Thermal treatment oven for products supported by a gas cushion, comprising a hearth provided with passages for the supporting gases, said hearth consisting of contiguous elements assembled longitudinally; the oven comprises, for example, a pushing device, giving the elements of the hearth a slow linear movement along its longitudinal axis.
Description
United States Patent 8 1191 Moussou 1 1 May 28, 1974 1 FURNACE FOR THE THERMIC TREATMENT OF PRODUCTS SUPPORTED BY A GAS CUSHION [75] Inventor:
Jean Moussou, Pouzac, France Assignee: Ceraver, Paris, France Filed: Mar. 2, 1972 Appl. No.: 231,142
Foreign Application Priority Data Mar. 9, 1971 France 71.08072 US. Cl 432/258, 432/58, 432/122, 34/57 A Int. Cl. F27b 3/12, F27b 9/14 Field of Search 263/6, 28, 21 A; 214/1 BE; 432/58, 82,122, 155,11, 258; 34/31, 57 A; 248/363, 364
[56] References Cited UNITED STATES PATENTS 2,678,237 5/1954 Allander et al..... 214]] BE 3,325,157 6/1967 COOK 432/122 3,374,996 3/1968 Keough 432/122 3,375,094 3/1968 McMaster 214 1 BE 3,455,669 1 7/1969 McMaster ....'214 1 BE 3,455,671 7/1969 McMaster 214/1 BE Primary Examiner-John J. Camby Assistant Examiner-Henry C. Yuen Attorney, Agent, or Firm-Sughrue, Rothwell, Mion, Zinn & Macpeak [57] ABSTRACT Thermal treatment oven for products supported by a gas cushion, comprising a hearth provided with passages for the supporting gases, said hearth consisting of contiguous elements assembled longitudinally; the oven comprises, for example, a pushing device, giving the elements of the hearth a slow linear movement along its longitudinal axis.
.3 Claims, 2 Drawing Figures BACKGROUND OF THE INVENTION supporting the products to be subjected to thermic treatment,.such as the firing of ceramic products,
passes.
This hearth is subjected to mechanical stresses due to its weight and to gas pressure, while it is brought to a high temperature, whereas its porous nature or the presence of holes reduces the mechanical strength thereof. The maintenance of the hearth, and its rapid repair therefore, constitute one of the greatest problems in this type of furnace.
The applicant has already proposed, in his-French Pat. application No. 7,102,205 of Jan. 22, 1971, to form the hearth of the furnace with separate elements which can be drawn from the assembly to avert accidents or to proceed with repairs. This still requires,
DESCRIPTION OF THE PREFERRED EMBODIMENT The furnace consists essentially of a channel which a hearth 2, consisting of contiguous elements 3, divides into two parts 4 and 5. The contiguous elements 3 are porous or drilled with holes 6 allowing the gases brought at 4 to a pressure greater than that which prevails at 5 to pass.
The heating and gas flow devices. which do not form a part of the invention, and are known per se, are not illustrated.
According to the invention, the drilled or porous hearth 2 crossed by a gas current which constitutes the gas cushion on which the products to be treated move, can move, for example, under the effect of a motordriven pusher 9 on the uprights 7 and 8. Devices such as the motor-driven pusher 9 are also known per se, but previously they have been used exclusively with supports for products to be fired in furnaces of a conventional type, without a gas cushion. The motor-driven pusher 9 is used to cyclically introduce into the furnace fresh elements 3A, while simultaneously pushing the previously introduced elements 3 towards the outlet end of the furnace.
however, the stopping of the furnace to remove the faulty element and replace it.
The invention proposes to give a simple solution for the problem of surveying the stateand rapid repairing of the hearth, not requiring the stopping of the furnace. Thus, it proposes to ensure continuous operation of such furnaces during very long periods. Lastly, it proposes to prolong-the operating period of the part of the hearth subjected to the severest thermo-mechanical Stresses.
SUMMARY OF THE INVENTION products to be subjected'to thermic treatment. This movement can be made in one direction or the other. The speed of movement-of the products subjected to the thermic treatment is independent from that of the hearth.
A furnace for firing ceramic products, according to the invention, is described hereafter, by way of an example, and with reference to the accompanying drawing.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 shows the entrance zone of the furnace in a longitudinal sectional view.
FIG. 2 shows it in a transversal sectional view.
The furnace thus produced enables not only surveying and easy maintenance of the hearth, but also improves the service conditions by limiting the exposure period of the elements forming the hearth in the high thermo-mechanical stress zone, for a same operating period.
Although the furnace described above constitutes the preferred form of embodiment of the invention, it will be understood that various modifications can be made thereto without going beyond the scope of the invention. More particularly, the form of the elements is not necessarily rectangular.
The elements need not occupy the whole width of the furnace, but only a fraction thereof, the furnace com prising, then, one or several low longitudinal walls intended for supporting the edges of the elements which do not rest on its lateral uprights. The holes 6 of the contiguous elements canbe oblique in relation to the longitudinal plane of symmetry of the furnace and/or in the direction of the progression of the products subjected to thermal treatment, so as to exert, on these, a centering and/or propelling effect.
What is claimed is:
l. A furnace for the continuous thermal treatment of products by supporting the products solely on gases over a hearth while heating the products and moving them through the furnace, said furnace comprising:-
a housing defining a channel;
a hearth enclosed within said housing and dividing said channel into an upper part and a lower part, said hearth comprising a plurality of contiguous elements placed side by side longitudinally in said channel and provided with passages for said gases;
means for providing said gases in said lower part of said channel under sufficient pressure so that, when said furnace is in use, said gases will pass through said passages in said hearth and support said products over said hearth while said products are heated and moved through said furnace;
means for moving said products through said furnace; and
4 said hearth.
3. A furnace as claimed in claim 1 wherein said means for moving said products through said furnace is adapted to move said products at a speed faster than the slow speed at which said mechanical means move the elements of said hearth through said furnace.
Claims (3)
1. A furnace for the continuous thermal treatment of products by supporting the products solely on gases over a hearth while heating the products and moving them through the furnace, said furnace comprising: a housing defining a channel; a hearth enclosed within said housing and dividing said channel into an upper part and a lower part, said hearth comprising a plurality of contiguous elements placed side by side longitudinally in said channel and provided with passages for said gases; means for providing said gases in said lower part of said channel under sufficient pressure so that, when said furnace is in use, said gases will pass through said passages in said hearth and support said products over said hearth while said products are heated and moved through said furnace; means for moving said products through said furnace; and mechanical means for giving the elements of said hearth a slow, unidirectional linear movement along a longitudinal axis of said channel, which unidirectional linear movement is independent of the movement of said products through said furnace.
2. A furnace as claimed in claim 1 and further comprising a lateral upright extending vertically from the bottom of said channel and supporting a lateral edge of said hearth.
3. A furnace as claimed in claim 1 wherein said means for moving said products through said furnace is adapted to move said products at a speed faster than the slow speed at which said mechanical means move the elements of said hearth through said furnace.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7108072A FR2128930A5 (en) | 1971-03-09 | 1971-03-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3813217A true US3813217A (en) | 1974-05-28 |
Family
ID=9073185
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00231142A Expired - Lifetime US3813217A (en) | 1971-03-09 | 1972-03-02 | Furnace for the thermic treatment of products supported by a gas cushion |
Country Status (5)
Country | Link |
---|---|
US (1) | US3813217A (en) |
DE (1) | DE2209072A1 (en) |
FR (1) | FR2128930A5 (en) |
GB (1) | GB1367382A (en) |
IT (1) | IT959560B (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4565136A (en) * | 1983-03-01 | 1986-01-21 | Kawasaki Jukogyo Kabushiki Kaisha | Fluidized bed combustion furnace |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3037956C2 (en) * | 1980-10-08 | 1983-11-03 | Dr. C. Otto & Co. Gmbh, 4630 Bochum | Device for improving the flow of the gases entering the combustion chamber of technical gas furnaces, especially coke ovens |
GB9103962D0 (en) * | 1991-02-26 | 1991-04-10 | Cmb Foodcan Plc | An oven |
GB2259234B (en) * | 1991-09-05 | 1995-08-09 | Ian Duncan Mcfarlane | Food processing |
SG73538A1 (en) * | 1997-08-04 | 2000-06-20 | Matsushita Electric Ind Co Ltd | Method of heat treating object and apparatus for the same |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2678237A (en) * | 1948-09-13 | 1954-05-11 | Svenska Flaektfabriken Ab | Device for supporting and conveying materials |
US3325157A (en) * | 1964-07-08 | 1967-06-13 | Norton Co | Firing of grinding wheels and the like in a tunnel furnace |
US3375094A (en) * | 1965-01-11 | 1968-03-26 | Permaglass | Method and apparatus for shaping glass or the like on a curved gas support bed |
US3374996A (en) * | 1965-01-22 | 1968-03-26 | William R. Keough | Method and apparatus for conveying workpieces |
US3455671A (en) * | 1966-05-09 | 1969-07-15 | Permaglass | Gas support bed apparatus for treating glass |
US3455669A (en) * | 1966-05-09 | 1969-07-15 | Permaglass | Apparatus for heat treating glass on a fluid support |
-
1971
- 1971-03-09 FR FR7108072A patent/FR2128930A5/fr not_active Expired
-
1972
- 1972-02-25 DE DE19722209072 patent/DE2209072A1/en active Pending
- 1972-03-01 GB GB964372A patent/GB1367382A/en not_active Expired
- 1972-03-02 US US00231142A patent/US3813217A/en not_active Expired - Lifetime
- 1972-03-09 IT IT21608/72A patent/IT959560B/en active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2678237A (en) * | 1948-09-13 | 1954-05-11 | Svenska Flaektfabriken Ab | Device for supporting and conveying materials |
US3325157A (en) * | 1964-07-08 | 1967-06-13 | Norton Co | Firing of grinding wheels and the like in a tunnel furnace |
US3375094A (en) * | 1965-01-11 | 1968-03-26 | Permaglass | Method and apparatus for shaping glass or the like on a curved gas support bed |
US3374996A (en) * | 1965-01-22 | 1968-03-26 | William R. Keough | Method and apparatus for conveying workpieces |
US3455671A (en) * | 1966-05-09 | 1969-07-15 | Permaglass | Gas support bed apparatus for treating glass |
US3455669A (en) * | 1966-05-09 | 1969-07-15 | Permaglass | Apparatus for heat treating glass on a fluid support |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4565136A (en) * | 1983-03-01 | 1986-01-21 | Kawasaki Jukogyo Kabushiki Kaisha | Fluidized bed combustion furnace |
Also Published As
Publication number | Publication date |
---|---|
DE2209072A1 (en) | 1972-09-14 |
GB1367382A (en) | 1974-09-18 |
IT959560B (en) | 1973-11-10 |
FR2128930A5 (en) | 1972-10-27 |
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