EP0284858A1 - Four de cuisson à chauffage par radiation - Google Patents

Four de cuisson à chauffage par radiation Download PDF

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Publication number
EP0284858A1
EP0284858A1 EP88103902A EP88103902A EP0284858A1 EP 0284858 A1 EP0284858 A1 EP 0284858A1 EP 88103902 A EP88103902 A EP 88103902A EP 88103902 A EP88103902 A EP 88103902A EP 0284858 A1 EP0284858 A1 EP 0284858A1
Authority
EP
European Patent Office
Prior art keywords
temperature
radiator
temperatures
door
areas
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.)
Granted
Application number
EP88103902A
Other languages
German (de)
English (en)
Other versions
EP0284858B1 (fr
Inventor
Franz Daub
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.)
Franz Daub U Sohne U Co GmbH
Original Assignee
Franz Daub U Sohne U Co GmbH
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 Franz Daub U Sohne U Co GmbH filed Critical Franz Daub U Sohne U Co GmbH
Publication of EP0284858A1 publication Critical patent/EP0284858A1/fr
Application granted granted Critical
Publication of EP0284858B1 publication Critical patent/EP0284858B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/06—Arrangement or mounting of electric heating elements

Definitions

  • the invention relates to a radiation oven with an upper and a lower heatable radiator of low heat capacity, which are each provided with a temperature sensor for thermostatic control and special heating elements in the area near the door, and with a control device for the radiator temperatures.
  • the heat requirement is different in different areas of the baking room.
  • the experienced baker therefore knows that he has to start by getting the bottom heat stronger.
  • newer types of furnace US-A 2 415 768; DE-C 1 229 693
  • the high heat capacity is dispensed with and instead a higher temperature of the lower heater is set at the beginning.
  • the heat requirement within the baking room also differs in that there is greater heat loss near the opening when the door is open than further back. It is therefore known to provide special heating elements in the area close to the door (US Pat. No. 2,415,768), which can also be regulated independently of the heating elements located further back (DE-C 1 229 693) by connecting the switch via special switches or regulators Network are connected. This complicates the operation of the oven extremely, because not only the top and bottom heat must be set differently, but also the temperature in the area near the door.
  • the invention has for its object to provide a radiation oven of the type mentioned, which is easier to use.
  • the solution according to the invention consists in that the heating elements of the area near the door can be separately thermostatically controlled by means of temperature sensors provided there separately, that the temperature sensors are arranged for determining the heater temperature and that the control device is set up to control constant heater temperatures by specifying only a uniform temperature.
  • the radiator temperatures are preferably not only regulated constantly but also immediately.
  • the invention is based on the knowledge that with sufficient power tuning and a sensitive measurement of the heater temperature as such (without falsification by nearby heating elements or parts of large heat capacity), the different heat requirements in different areas of the baking space can be taken into account even if the assigned heater areas do not exist the different heat demand corresponding different temperature is specified. This contradicts the previous, thermally well-founded view. Different heat requirements can of course only be taken into account by different heat flow densities. However, if - as the invention presupposes - both the heater temperatures and the product temperatures are the same everywhere at the start of the baking process, no different heat flow densities can result and therefore no different heat supply can take place zone by zone.
  • the invention has recognized that the constant temperature conditions only exist during a short time interval which is not decisive for the baking result. Very soon, different temperatures will appear on the good side, which correspond to the different heat requirements. The areas of high heat demand maintain a cooler temperature because the heat received is dissipated more quickly (this is especially true on the underside), while the areas of lower heat demand quickly reach a higher temperature because the heat received is not dissipated as quickly (primarily on the top) ). This changes the effective temperature difference and consequently also the heat flow density that depends on it. Radiators with low heat capacity are all those that are built on comparatively thin metal sheets (US Pat. No. 2,415,768) in contrast to thick plates (DE-C 392 366).
  • the arrangement of the temperature sensors in such a way that they are suitable for determining the radiator temperature requires not only their direct contact with the radiator plates but also such a great distance from the heating elements and other disruptive parts that their measurement result is not affected by them.
  • a known arrangement US Pat. No. 2,415,768 is not suitable for determining the radiator temperature because the temperature sensors are arranged directly adjacent to the heating element housing.
  • Specifying only a uniform temperature means that the temperatures or heating outputs of the individual areas (top or bottom heat; front or rear area of a radiator) need not be set separately, but rather a uniform baking temperature is specified.
  • This predetermined temperature is generally also the temperature which is to be regulated on the radiator surfaces or a specific temperature which, according to baking experience, has a fixed ratio.
  • the controller sets slightly different temperatures for different baking areas (for example slightly higher temperatures in the front areas of the radiators) if, for example, greater heat losses are to be expected there. This doesn't change anything the principle of constant temperature of the heater depends on only one temperature to be specified by the baker when the oven is set.
  • an oven contains several baking rooms (e.g. deck oven), the baking temperature of each individual baking room can be set separately. If, however, all baking rooms are intended exclusively for the same baked goods, a temperature common to them can also be provided.
  • a control device for limiting the total heating power (and thus the connected load), which is based on the fact that the controller does not readily meet every energy requirement signaled by a radiator temperature deviation, but rather forms a ranking of the areas with regard to their power requirement, which depends on the measured difference between the target and the actual temperature, with the areas of lower demand being excluded from the energy supply for the time being as far as their supply would exceed the limit mentioned.
  • This facility is particularly useful for ovens with several baking rooms, in which the staggering of the baking processes can be avoided in all baking rooms at the same time peak demand occurs, and in which the large number of areas to be served can provide a statistically appropriate compensation without affecting the baking result.
  • a cycle operation takes place in which only some of the emitters are supplied with energy.
  • the oven has a housing 1 which has an opening 2 at the front which can be closed by a door 3 which is hinged to the housing 1 by a hinge 4.
  • the oven contains an upper radiator 5 and a lower radiator 6, which are plate-shaped. Both have a front area 7 and a rear area 8, which can be heated separately.
  • a temperature sensor 10 is arranged in each of the front area 7 and the rear area 8.
  • the baking sheet 9 is held at a distance from the lower radiators and covers the rear radiator region 8 and at least that part of the front radiator region 7 which contains the temperature sensor 10.
  • the temperature sensors 10 are connected to a control device which separately controls the power supply for the upper radiator 5 and the lower radiator 6 and for the respective front and rear regions 7 and 8 of the radiators.
  • the separate heating possibility for the areas can be achieved in that these areas contain heating element arrangements which are electrically separate from one another.
  • the size of the front area in relation to the rear area depends on the geometry of the furnace and its main purpose. However, a depth has proven to be particularly expedient for the front area, which is approximately 10 to 30% of the total depth of the emitters.
  • the temperature sensors can simply be glued to the emitters so that the emitter temperature can be determined directly. Their protected arrangement within the radiator constructed from two sheet metal plates according to FIG. 2 is preferred.
  • the upper sheet metal plate 11 forms the radiation-effective surface.
  • the lower, in the manner shown, deformed sheet metal plate 12 includes trapezoidal spaces 13 for receiving the heating rods 14 with the upper sheet metal plate 11.
  • a further space 15 for accommodating the temperature sensor 16 is formed at a distance from the heating rods and the spaces 13 containing them. This can be formed by a thermocouple, a thermal resistor, one or more such elements or the like.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electric Stoves And Ranges (AREA)
  • Control Of Resistance Heating (AREA)
EP88103902A 1987-03-12 1988-03-11 Four de cuisson à chauffage par radiation Expired - Lifetime EP0284858B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8703748U DE8703748U1 (de) 1987-03-12 1987-03-12 Strahlungsbackofen
DE8703748U 1987-03-12

Publications (2)

Publication Number Publication Date
EP0284858A1 true EP0284858A1 (fr) 1988-10-05
EP0284858B1 EP0284858B1 (fr) 1991-01-23

Family

ID=6805781

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88103902A Expired - Lifetime EP0284858B1 (fr) 1987-03-12 1988-03-11 Four de cuisson à chauffage par radiation

Country Status (2)

Country Link
EP (1) EP0284858B1 (fr)
DE (2) DE8703748U1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5790750A (en) * 1993-10-29 1998-08-04 Applied Materials, Inc. Profiled substrate heating utilizing a support temperature and a substrate temperature

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2919918A1 (fr) * 2007-08-09 2009-02-13 Eurofours Sa Four ventile pour la cuisson des aliments

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE392366C (de) * 1921-12-08 1924-03-20 Aeg Elektrisch beheizter Backofen
CH216934A (de) * 1940-10-08 1941-09-30 Backofenfabrik Tschann Elektrisch beheizbarer Ofen zum Backen und Dörren.
US2415768A (en) * 1942-10-05 1947-02-11 Harold N Shaw Electric oven
DE1229693B (de) * 1957-04-08 1966-12-01 Elektro Dahlen Vorzugsweise elektrisch beheizter Back- und Bratofen
US4215266A (en) * 1978-12-21 1980-07-29 Smith Gilbert L Baking oven

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE392366C (de) * 1921-12-08 1924-03-20 Aeg Elektrisch beheizter Backofen
CH216934A (de) * 1940-10-08 1941-09-30 Backofenfabrik Tschann Elektrisch beheizbarer Ofen zum Backen und Dörren.
US2415768A (en) * 1942-10-05 1947-02-11 Harold N Shaw Electric oven
DE1229693B (de) * 1957-04-08 1966-12-01 Elektro Dahlen Vorzugsweise elektrisch beheizter Back- und Bratofen
US4215266A (en) * 1978-12-21 1980-07-29 Smith Gilbert L Baking oven

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5790750A (en) * 1993-10-29 1998-08-04 Applied Materials, Inc. Profiled substrate heating utilizing a support temperature and a substrate temperature

Also Published As

Publication number Publication date
EP0284858B1 (fr) 1991-01-23
DE3861604D1 (de) 1991-02-28
DE8703748U1 (de) 1987-09-10

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