US3658048A - Food-treatment apparatus with telescoping seal for air-circulating blower - Google Patents

Food-treatment apparatus with telescoping seal for air-circulating blower Download PDF

Info

Publication number
US3658048A
US3658048A US93272A US3658048DA US3658048A US 3658048 A US3658048 A US 3658048A US 93272 A US93272 A US 93272A US 3658048D A US3658048D A US 3658048DA US 3658048 A US3658048 A US 3658048A
Authority
US
United States
Prior art keywords
ring
wall
apparatus defined
opening
rings
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
US93272A
Other languages
English (en)
Inventor
Werner Eckhardt
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.)
Burger Eisenwerke AG
Original Assignee
Burger Eisenwerke AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Burger Eisenwerke AG filed Critical Burger Eisenwerke AG
Application granted granted Critical
Publication of US3658048A publication Critical patent/US3658048A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/32—Arrangements of ducts for hot gases, e.g. in or around baking ovens
    • F24C15/322—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation
    • F24C15/325—Arrangements of ducts for hot gases, e.g. in or around baking ovens with forced circulation electrically-heated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C14/00—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning
    • F24C14/02—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2007—Removing cooking fumes from oven cavities
    • F24C15/2014—Removing cooking fumes from oven cavities with means for oxidation of cooking fumes

Definitions

  • a food-treatment apparatus e.g. an oven, has a muffle defining a closed chamber in which food is heated and a fan in this chamber for circulating air therein during food treatment and pyroliztic self-cleaning thereafter.
  • This fan is powered by a motor outside the muffle and extends through an opening in the muffle wall.
  • a pair of nested telescoping angle-profile 0r flanged rings, one attached to the inside face of that wall and the other to its outside face carrying the motor are separated by an insulating ring, e.g. of asbestos, and surround the fan in the opening to form a thermally yielding seal and motor support.
  • the present invention relates r a food-treatment apparatus. More specifically this invention concerns an oven used for the thermal treatment, 'e.g. baking, broiling, or comestibles and provided with so-called self-cleaning means.
  • Such a self-cleaning apparatus is often provided with a fan inside its treatment chamber which is operated to circulate gases therein during cooking or cleaning for even heat distribution.
  • a fan inside its treatment chamber which is operated to circulate gases therein during cooking or cleaning for even heat distribution.
  • temperatures of about 500 C. are necessary for the pyrolitic decomposition and/or combustion of food residue, it is necessary to protect the fan motor. This has been done in the past through the simple expedient of. mounting the motor outside the treatment chamber, with the fan extending through a wall of the chamber as described in the above-mentioned applications for example.
  • Another object is to provide a seal having particular adaptability to a food-treatment apparatus of the type described and claim ed in the above-mentioned applications.
  • an apparatus having a housing defining a closable heatable chamber with one wall formed with an opening through which blower means or circulating air in the chamber passes.
  • Mounting means is provided which includes a first axially directed ring fixed to an inside face of the wall and extending outwardly in the opening and a second axially directed ring telescopically received in the first ring and fixed to an outside face ofthe wall.
  • the second ring extends inwardly in the opening and the blower means extends through the rings so that, when the wall expands on heating, they move axially relative to each other.
  • An important feature of the invention provides that the motor and fan assembly is mounted solely upon the annular outwardly extending flange of the outer flanged ring and that this mounting means is formed with a housing sleeve which is telescopingly received within, but is spaced circumferentially from the inner ring.
  • annular compressible seal ofinsulating material e.g. asbestos
  • the ring attached to the inner face is nested within the other ring.
  • the housing defining the chamber is, according to yet another feature, formed by a thick body of insulating material such as Fiberglas sandwiched between two metal sheets.
  • the rings are angle rings each attached to one of the sheets.
  • FIG. 1 is a vertical longitudinal section through an apparatus according to the present invention.
  • FIG. 2 is a detail of FIG. 1 in enlarged scale.
  • an oven has a housing 10 of sheet metal in which is provided a muffle 1 having a cooking chamber 4 in which food to be cooked can be held on racks 11.
  • the muffle 1 has one end closed by a door 12 and another end 2 formed with an opening 13.
  • a catalytic afterburner 14 is provided in its top wall opening into a space 15 between the housing 10 and the muffle l.
  • a hood 16 is provided at the back of the cooking chamber 4 with its wide mouth open towards the door and its narrow mouth opening toward a fan 3 which extends through the opening I3 and is connected to an electric drive motor 17 received in a chamber 18 in back of the muffle 1 in the housing 10.
  • the muffle l is formed with thick walls comprising an metallic inner skin la and an metallic outer skin lb sandwiching a body of 1c of insulating material such as Fiberglas.
  • insulating material such as Fiberglas.
  • Such a construction is extremely durable and offers excellent thermal insulating properties so that, on heating of the chamber 4 by the electric element 19 disposed around the hood 16, very little heat is lost. It is possible to heat the chamber 4 up to a around 450 centigrade for self-cleaning of the wall 1a and the racks 11, the noxious vapors being rendered harmless by the catalytic afterburner 14.
  • the fan 3 is adapted to be operated both during cooking and self-cleaning. To this end it comprises three coaxial portions, a pair of oppositely directed axial-input radial-output fans 3a and 3c separated by a hub 3b.
  • the fan 3a is received in the chamber 4 and, on rotation, pulls gases in axially through the hood l6 and expells them radially outwardly around this hood, as shown by the arrows 20.
  • the fan 30 is in the chamber I8 and serves to circulate air through the motor 17 and expel it outwardly in this chamber as shown by the arrows 21, whence it passes through the space 15 and out of the housing 10.
  • the hub 3b axially spaces the two fans 30 and 3c and passes through the opening 13 in the rear wall 2 of the muffle l.
  • a ring 5 of L cross section Bolted to the inner face of wall 2, with interposition of an insulating washer 22, is a ring 5 of L cross section.
  • This angle ring 5 has, thus, an annular portion 5a bolted to and lying in a plane parallel to the inner wall 7 of the muffle end 2, and portion 5b of cylindrical shape extending from the inner periphery of the attached portion 5a outwardly in the opening 13.
  • a similar L-section metallic ring 6 is provided with its flange portion 6a bolted directly to the outer face of the wall 2 and and its cylindrical, axially directed portion 6b extending in the opening 13 inwardly toward the muffle 4.
  • the ring portion 6b lies coaxial with and outside of the portion 511, with a cylindrical ring 8 of asbestos insulating material compressed between these two portions.
  • An annular metallic body or sleeve 9 comprising a pair of substantially planar and parallel portions separated by a cylindrical portion is bolted with the motor flange 24, an insulating gasket and the ring portion 6b to the wall 2.
  • This body 9 also prevents heat loss through the opening 13 by controlling air currents therethrough and serves to center the fan 3 while defining with the rings a labyrinth seal.
  • An apparatus for the heat treatment ofa comestible comprising:
  • a housing defining a closable heatable chamber adapted to receive said comestible, said housing having a wall formed with an opening;
  • blower means extending through said opening for circulating air in said chamber
  • mounting means including a first ring fixed to an inside face of said wall and extending axially outwardly in said opening and a second ring telescopically received in said first ring and fixed to an outside face of said wall, said second ring extending axially inwardly in said opening, said blower means extending through said rings, whereby on thermal expansion of said wall said rings move axially relative to each other.
  • each of said rings is an angle ring with an annular flange portion attached to the respective face of said wall and a cylindrical portion extending from the inner periphery of the flange portion.
  • blower means includes a fan rotatable about an axis, said cylindrical portions being coaxial with said axis.
  • said wall includes an outer metallic skin forming said outer face, an inner metallic skin forming said inner face, and a body of compressible insulating material between said skins.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Baking, Grill, Roasting (AREA)
  • Muffle Furnaces And Rotary Kilns (AREA)
US93272A 1970-04-11 1970-11-27 Food-treatment apparatus with telescoping seal for air-circulating blower Expired - Lifetime US3658048A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE7013392U DE7013392U (de) 1970-04-11 1970-04-11 Geraet zur waermebehandlung von speisen.

Publications (1)

Publication Number Publication Date
US3658048A true US3658048A (en) 1972-04-25

Family

ID=6610841

Family Applications (1)

Application Number Title Priority Date Filing Date
US93272A Expired - Lifetime US3658048A (en) 1970-04-11 1970-11-27 Food-treatment apparatus with telescoping seal for air-circulating blower

Country Status (5)

Country Link
US (1) US3658048A (online.php)
DE (1) DE7013392U (online.php)
FR (1) FR2092235A5 (online.php)
GB (1) GB1262037A (online.php)
NL (1) NL158694B (online.php)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5795360A (en) * 1996-02-26 1998-08-18 Mactavish Machine Manufacturing Co. Apparatus for the separation of tobacco lamina from an air stream

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3243816A1 (de) * 1982-11-26 1984-05-30 Miele & Cie GmbH & Co, 4830 Gütersloh Herd mit einer backmuffel

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2490076A (en) * 1945-09-18 1949-12-06 Foremost Dairies Inc Electric oven
US3414708A (en) * 1965-10-22 1968-12-03 Malleable Iron Range Company Forced convection oven
US3529582A (en) * 1968-12-09 1970-09-22 Gen Electric Self-cleaning forced convection oven

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2490076A (en) * 1945-09-18 1949-12-06 Foremost Dairies Inc Electric oven
US3414708A (en) * 1965-10-22 1968-12-03 Malleable Iron Range Company Forced convection oven
US3529582A (en) * 1968-12-09 1970-09-22 Gen Electric Self-cleaning forced convection oven

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5795360A (en) * 1996-02-26 1998-08-18 Mactavish Machine Manufacturing Co. Apparatus for the separation of tobacco lamina from an air stream

Also Published As

Publication number Publication date
FR2092235A5 (online.php) 1971-01-21
NL7014072A (online.php) 1971-10-13
DE7013392U (de) 1970-07-16
NL158694B (nl) 1978-12-15
GB1262037A (en) 1972-02-02

Similar Documents

Publication Publication Date Title
US3548152A (en) Self-cleaning oven having cooling and ventilating system
US3364912A (en) Self-cleaning gas oven
US3962561A (en) Catalytically assisted pyrolytic self-cleaning oven
GB1015049A (en) Improvements in household cooking ovens and methods of cleaning the same
US4390767A (en) Windowed and choked combination oven door
CA1206192A (en) Pyrolytic oven cleaning system
SE8008749L (sv) Spis
US2957067A (en) Appliance units
US3656469A (en) Air-circulation apparatus for self-cleaning oven and the like
ES387809A1 (es) Dispositivo de tratamiento termico por conveccion gaseosa forzada.
US5142125A (en) Double-chamber electric oven with uniform heat transfer
GB1261250A (en) Improved cooking unit
US3027444A (en) Hydraulic thermostat bulb shielding means
GB1419308A (en) Heat treatment furnace
US3414708A (en) Forced convection oven
US4303817A (en) Microwave oven
US20210348768A1 (en) Sealing system for an oven cavity
US3367316A (en) Oven for closed door broiling
US3331942A (en) Domestic oven with smoke leakage prevention
US3553425A (en) Door mounted catalyst exhaust arrangement for a self-cleaning oven
GB2038148A (en) Microwave oven
US3387601A (en) Self-cleaning oven
US3066212A (en) Thermal isolation of oven liner
US2430101A (en) Combustion chamber
US3260783A (en) Vacuum oven