US3219332A - Seal for rotary hearth furnaces - Google Patents

Seal for rotary hearth furnaces Download PDF

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Publication number
US3219332A
US3219332A US155156A US15515661A US3219332A US 3219332 A US3219332 A US 3219332A US 155156 A US155156 A US 155156A US 15515661 A US15515661 A US 15515661A US 3219332 A US3219332 A US 3219332A
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US
United States
Prior art keywords
bearing surface
skirt
bearer
furnace
lip
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
Application number
US155156A
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English (en)
Inventor
Guingand Jean Raymond
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heurtey SA
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Heurtey SA
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Publication date
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0037—Rotary furnaces with vertical axis; Furnaces with rotating floor
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0006—Details, accessories not peculiar to any of the following furnaces
    • 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
    • F27B9/16—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 circular or arcuate path
    • 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
    • F27B9/16—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 circular or arcuate path
    • F27B9/18—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 circular or arcuate path under the action of scrapers or pushers

Definitions

  • Sand seals lack impermeability, while hydraulic seals, though absolutely tight, entail the use of relatively complex equipment, which may create chill zones which may in turn affect the furnace temperature or even cause the formation of steam, which is often undesirable and sometimes detrimental.
  • the chief aim of the present invention is to overcome the drawbacks of the above type of seals.
  • a dry seal according to the invention comprises at least one flexible-lipped skirt constituting a tightening skirt of which an elastically deformed part is applied against a bearing surface, and at least one second skirt protecting the first, in which contiguous mobile elements are in rubbing contact with a chafing ring on said bearing surface, said second skirt being designed mainly to screen the first skirt from heat and dust.
  • the bearing surface is provided with at least one step which assists in trapping dust which step is located between the chafing ring and the area contacted by the deformable lip in order to further improve the degree of protection against dust or such extraneous matter as oxide scale or splits, or pieces of refractory, for example.
  • the bearing surface of the seal is preferably associated with a channel that acts as a dust trap and is provided with hoppers that are designed to receive the dust and can easily be emptied periodically, said channel being preferably swept continuously by associated movably driven scrapers.
  • the bearing surface, the channel and the hoppers are rigid with stationary parts of the furnace, while the skirts and the scrapers are mounted beneath a furnace hearth bearer, and hence on a moving part.
  • a converse arrangement may be adopted.
  • Seals of this type may comprise a plurality of skirts, between which it is further possible to maintain a slight overpressure for the purpose of ensuring, by the use of a smoke or an atmosphere gas for example, a degree of protection with improved sealing and enhanced reliability, that may be monitored if required.
  • FIGURE 1 is a diametrical sectional view of an annular rotary hearth furnace, showing the location of the seals.
  • FIGURE 2 is a sectional detail view of the disposition of the seal between an outer wall and the corresponding edge of the hearth.
  • FIGURE 3 is a fragmentary perspective view of the seal detail in FIGURE 2.
  • the furnace shown there in is an annular furnace the charge-chamber 1 of which is disposed between an inner cylindrical wall 2 and an outer cylindrical wall 3 with an associated arch 4, the bottom of the charge-chamber 1 being closed by a movable annular hearth 5 adapted to revolve on suitable moving bearings comprising rollers 6 adapted for rolling movement along a circular track 7.
  • the hearth 5 consists of a refractory facing 8 resting on a bearing 9 to which the said rolling gear 6 is secured.
  • each channel 10 On its side nearer to the center of the charge-chamber, each channel 10 is bounded by a wall 12 raised above the level of the channel bottom, and said wall carries through the medium of supports 13 an annular bearing surface 14 which is provided with a circular step 15 serving to elevate the inner portion 14a of said bearing surface, to wit the portion remote from the furnace wall 3 (or 2), as opposed to a portion 14b that is closer thereto.
  • the bearer 9 is rigid with scrapers 16 formed as known by blades movably driven by bearer 9 in channel 10 to sweep said channel 10 and conduct dust or other impurities through the perforations (not shown) in the channel 10 to the hoppers 11.
  • Said bearer is equipped with a circular angle bracket 17 from which is suspended a tightening skirt 18 located above the surface 14a, and the lower edge of the skirt 18 supports a pair of rings 19 and 20 between which is clamped a cylindrical diaphragm 21 made of flexible and elastic material such as rubber.
  • the joints between the bearer 9 and the bracket 17, between the bracket 17 and the skirit 18, and between the skirt 18 and the diaphragm 21 are sealed joints.
  • This assembly is designed so that the diaphragm 21 contacts the bearing surface 14a through a flattened portion 22 which is directed inwardly or outwardly accordingly as the pressure of the outside atmosphere is less or greater than that of the atmosphere in the charge-chamber 1.
  • the disposition shown in FIGURE 3 corresponds to an outside pressure slightly higher than that prevailing in the charge-chamber 1, and the position 22 is bent towards the higher pressure.
  • the bearer 9 is further provided, with a second circular bracket 23 to which is fixed a second, protecting skirt.
  • the latter skirt includes a cylindrical element 24 which is associated, through the instrumentality of a sliding assembly, to cylindrical segments 25, and in the example illustrated these contiguous segments are connected to the element 24 through the medium of tenons 26 which are rigid therewith and which co-operate with mortises 27 provided in each segment, said mortises being cut parallel to the generators of the corresponding cylinders.
  • the bottom arcuate face of each segment 25 is supported on an annular chafing plate 28 welded to the bearing surface 14b.
  • the two seals flanking the hearth 5 are formed identically and concentrically, with their like parts disposed opposite one another.
  • the scrapers 16 passing in the channels 10 sweep the dust and other impurities therefrom into the hoppers and thereby prevent most of the dust or other extraneous matter from passing the partition 12.
  • the hoppers 11 are periodically emptied of accumulated material. Any impurities finding their way past the channels, however, are arrested by the corresponding element 24 and segments 25 since said contiguous segments are applied against the element 24 and against the annular chafing plate 28 and said element constantly masks the mortises 27.
  • step 15 Any ultimately subsisting extraneous matter can still be retained by the step 15, so that the quality of the contact between the lip 22 and the surface 14a is efiectively protected against possible deterioration and therefore remains thoroughly tight.
  • the diaphragm 21 and the lip 22 are furthermore protected thermally by the element 24 and the segments 25.
  • a dry seal for a rotary hearth furnace comprising at least one tightening skirt having an elastically flexible lip, a corresponding bearing surface upon which a deformed part of said flexible lip is slidably applied, said bearing surface including a step in the vicinity of the portion of said bearing surface upon which is applied said deformed part of said lip, at least a second skirt spaced from the first skirt and including coaxial cylindrical segments contiguously supported in axially slidable overlapping relation, and a chafing ring on said bearing surface upon which are applied in rubbing contact said cylindrical segments, said chafing ring being located opposite said step on a side thereof away from said portion on which is applied said lip.
  • a dry seal for a rotary hearth furnace comprising at least one tightening skirt having an elastically flexible lip, a corresponding bearing surface upon which a deformed part of said flexible lip is slidably applied, said bearing surface including a step in the vicinity of the portion of said bearing surface upon which is applied said deformed part of said lip, at least a second skirt spaced from the first skirt and including coaxial cylindrical segments contiguously supported in axially slidable overlapping relation, a chafing ring on said bearing surface, upon which are applied in rubbing contact said cylindrical segments, said chafing ring being located opposite said step on a side thereof away from said portion on which is applied said lip, and a trap adapted for retaining dust and other extraneous matter, said trap having the form of a channel situated in the vicinity of said chafing ring on a side thereof opposite the tightening skirt whereby the second skirt constitutes a protecting skirt for the first said skirt as regards passage of dust and other extraneous matter from the trap to said first skirt.
  • a dry seal for a rotary hearth furnace comprising at least one tightening skirt having an elastically flexible lip, a corresponding bearing surface upon which a deformed part of said flexible lip is slidably applied, a step in said bearing surface in the vicinity of the portion of said bearing surface upon which is applied said deformed part of said lip, at least a second skirt including coaxial cylindrical segments contiguously supported in axially slidable over-lapping relation, a chafing ring on said bearing surface, upon which are applied in rubbing contact said cylindrical segments, said chafing ring being located opposite said step on a side thereof away from said portion on which is applied said lip, a trap adapted for retaining dust and other extraneous matter, said trap having the form of a channel situated in the vicinity of said chafing ring on a side thereof opposite the tightening skirt whereby the second skirt constitutes a protecting skirt for the first said skirt as regards passage of dust and other extraneous matter from the trap to said first skirt, movable scrapers in
  • a rotary hearth furnace having a charge chamber defined by inner and outer cylindrical walls and a mov able hearth in said chamber: dry seals for said chamber adjacent each of said walls, said furnace including a movable bearer supporting said hearth, each dry seal comprising a bearing surface opposite said movable bearer, a tightening skirt supported from said bearer and includ ing a flexible lip in deformed sliding contact with said bearing surface, and a protecting skirt supported from said bearer between the first said skirt and the wall corresponding thereto, said skirts both respectively forming seals between the bearer and the bearing surface opposite thereto.
  • each wall is provided with a channel adjacent the dry seal therefor, and scrapers supported on said bearer for moving in said channels for sweeping dust and impurities therefrom.
  • each channel is provided with apertures through which said slidably adjustable elements and means adjustably securing said elements together.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Thermal Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Tunnel Furnaces (AREA)
US155156A 1960-11-28 1961-11-27 Seal for rotary hearth furnaces Expired - Lifetime US3219332A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR845220A FR1281330A (fr) 1960-11-28 1960-11-28 Joint d'étanchéité pour four à sole tournante

Publications (1)

Publication Number Publication Date
US3219332A true US3219332A (en) 1965-11-23

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Application Number Title Priority Date Filing Date
US155156A Expired - Lifetime US3219332A (en) 1960-11-28 1961-11-27 Seal for rotary hearth furnaces

Country Status (5)

Country Link
US (1) US3219332A (en:Method)
ES (1) ES272521A1 (en:Method)
FR (1) FR1281330A (en:Method)
GB (1) GB937326A (en:Method)
LU (1) LU40857A1 (en:Method)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108443502A (zh) * 2018-05-09 2018-08-24 苏州倍丰激光科技有限公司 密封结构

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113790269A (zh) * 2021-09-28 2021-12-14 华能甘肃西固热电有限公司 磨煤机基座调整式上密封装置

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2074662A (en) * 1934-10-12 1937-03-23 Wellman Seaver Rolling Mill Co Rotating hearth furnace
US2154632A (en) * 1930-09-08 1939-04-18 Albert J Meier Seal
GB524970A (en) * 1939-02-14 1940-08-19 Wellman Smith Owen Eng Co Ltd Improvements relating to furnaces for the heat treatment of metal objects
US2213396A (en) * 1939-09-14 1940-09-03 Reed W Hyde Sintering machine
US2273821A (en) * 1940-05-07 1942-02-24 Charles E Agnew Sintering machine
US2556962A (en) * 1948-03-24 1951-06-12 Western Electric Co Apparatus for annealing magnetic iron
US2631870A (en) * 1949-10-15 1953-03-17 Air Preheater Regenerative heater seal biased by circumferential spring
US2944805A (en) * 1956-01-23 1960-07-12 Midland Ross Corp Heating method and apparatus

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2154632A (en) * 1930-09-08 1939-04-18 Albert J Meier Seal
US2074662A (en) * 1934-10-12 1937-03-23 Wellman Seaver Rolling Mill Co Rotating hearth furnace
GB524970A (en) * 1939-02-14 1940-08-19 Wellman Smith Owen Eng Co Ltd Improvements relating to furnaces for the heat treatment of metal objects
US2213396A (en) * 1939-09-14 1940-09-03 Reed W Hyde Sintering machine
US2273821A (en) * 1940-05-07 1942-02-24 Charles E Agnew Sintering machine
US2556962A (en) * 1948-03-24 1951-06-12 Western Electric Co Apparatus for annealing magnetic iron
US2631870A (en) * 1949-10-15 1953-03-17 Air Preheater Regenerative heater seal biased by circumferential spring
US2944805A (en) * 1956-01-23 1960-07-12 Midland Ross Corp Heating method and apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108443502A (zh) * 2018-05-09 2018-08-24 苏州倍丰激光科技有限公司 密封结构
CN108443502B (zh) * 2018-05-09 2024-03-22 苏州倍丰智能科技有限公司 密封结构

Also Published As

Publication number Publication date
FR1281330A (fr) 1962-01-12
LU40857A1 (en:Method) 1962-01-23
GB937326A (en) 1963-09-18
ES272521A1 (es) 1962-02-01

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