DE2208406A1 - PROCEDURE FOR EXTENDING THE TEMPERATURE REGULATION RANGE IN DOMESTIC GAS OVEN - Google Patents

Description

- u »d GrerauchemuaterChilfa-OaÄiaelduagt», El «ktro-u. Grae Armature »fabri3c GrmbH., Hohenlimburg

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In allc * iB ·! »·» Iat dtr Brt »» er aolchtr Hauahalta-Gaabacköf · » »Ach dtr maximum door light» Htizltiatu »g dta oven» a auagtltgt u »d zur Ei» attllu »g gtri» gsrtr operating temperature » with * i »* r aog« »a» »te» Proportio »alrtgtlu» g rtratht ». Egg »· dtr-

BAD 0RI * 3fNAL

309835/0195

This type of regulation controls the amount of gas flowing out of the burner as a function of the predetermined temperature in the chamber and causes the main valve to close when it exceeds the setpoint value set. In order not to completely extinguish the burner when there is no pilot flame, the control device is provided with a bypass line through which the burner always flows so much gas, even when the main valve is closed, that its flame is still burning stably. This measure, however, has the consequence that a certain minimum temperature la can be blocked even when the gas supply baking chamber not fall below the amount of which depends on the maximum power of the burner and is at values of about 15O ⁰ C.

Now you would for certain household chores, such as the For example, keeping food warm, defrosting frozen food or drying fruit, like operating temperatures have available which are significantly below the mandatory minimum temperature of the currently used. Gas appliances lie. For this purpose, a process has already been developed in which the required burner output is approximately up to 25 # of The maximum load is proportionally reduced and then the Gas supply is blocked suddenly. Control devices of this type accordingly do not have a bypass line, but rather use them ei »· special pilot flame, on which the

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the temperature · * «be» · ο suddenly back to the burner released grass he can ignite today. With such a scheme let », baking chamber temperatures as low as you like achieve "the process" itself, however, has the disadvantage of being able to Relatively high control frequency (switching frequency) to be bound », with each ignition and extinguishing process the relevant» gas quantity with u »a» ge »ehae» noises »Terbunde» is. Furthermore »can this procedure »» not for thawing »το» food »and the like. Will be rerweed, because the heat supply is not even enough he follows. Finally, in terms of equipment, there is a special one Ignition gas line and a pilot flame burner are required, which can be adjusted to all types of gas coming in from the gate and must be set. These inadequacies have resulted in the process not gaining any further acceptance.

In view of this, it makes use of the invention, the task of de "with the weitrerbreiteten proportional control rersehenen gas oven easily train down to operating temperatures tone 5O ⁰ C infinitely variable. The implementation of such a method should not require any special additional effort and, if possible, should even be subsequently applicable to household grass baking ovens that are already Torhandene.

The invention achieves a solution to this problem with gas-fired Household ovens by means of a process for

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Extension of the temperature control range, according to which the generated »heating gases are mixed over a control range below the minimum output of the« gas burner when flowing into the baking chamber with a ventilated amount of outside air conveyed into the baking chamber by a fan, this is the heating gas-air mixture Baclcraua flows evenly through it and lets it out again at a suitable point by means of a vent. In the course of it is below the bound to the minimum output of the burner value also possible to produce the respective operating temperatures, which as previously proportional further regulated heating gases rermischen with a constant volume normal temperature outside air mi how a the heating gases of the constant throttled to minimum power burner can add appropriately sized air toluene by regulating the speed of the fan motor. Both measures make it possible to expand the range of continuously regulated operating temperatures of a gas oven considerably "downwards".

To carry out the method according to the invention, the with a proportional control equipped gas oven either in its lower part with a pressure fan or in its Gas exhaust duct with a fan acting as a suction fan see. The pressure fan below is redesigned designed as a radial system and housed within a closed (sheet metal) housing, the inlet openings of which

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for the outside air through the oven (rear) wall rich · »., and dt · ■ tu access opening on the side below dt · with bucket Guide flank provided floor plate is. the real.tlich.eii oven joins. On 'Grund deaaen' I form through the axial of outwardly aage “eyes” and radially in the direction of the outward entrance de · Fan housing ··· conveyed air rolumea in the area of the outlet «Offaung eia Uaterpress au», the da »Aaeaugea der Heizgaae de · Breaaera and those «. Mixing with the ia the baking chamber blown a outside air causes.

The »· Miechuag _a u» heating gasea and room air is set to a temperature value eia, the "I with regard to aeiaer height" when supplying a »koaataatea outside air volume according to the egg-regulated Breaner flow or with a constant minimum output of the Brezinera after the supplied outside air volume and thus according to the regulated outside air volume Speed of the "fan motora directs, Dementapreeiiend iat according to a further development of the invention a with deic thermoatatiach geateuierte Regelrentil coupledea switching element Torgeaehen, which puts the electric motor dea radial fan" for the Teaperaturregelbereioh below the minimum power of the burner on voltage. The actual control & * - set operating temperature in this area is then carried out either by a proportional control of the gray supply to the burner, taking into account the supply of outside air _? or in the case of a constant minimum instruction of the burner * by means of a control system

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the delivery rate d ·· radial fan. With buckets of such procedures, "I can accordingly ^{regulate and maintain oven temperatures steplessly to values of around 50 0} G in a rorteiliger manner" without requiring any "special effort" or extensive changes to the already existing Basba ovens, which are subsequently extended with such an extension · Scope of application should be seen.

In the accompanying drawing is the method according to the invention schematically based on the position of a normal gas oven Illustrates why the separately or retrospectively to be installed Facilities are more drawn out in terms of lines.

As can be seen, the household gas appliance shown in cross-section is provided Via a baking chamber 1 accessible from the front, under the bottom plate 2 the τοη the thermostatic controlled regular rent 3 her with gas rersorgte Burner assembly 4 is located. For this purpose the τοη stands Operating side by means of a handle 5 on the desired Operating temperature adjustable control valve 3 via a capillary tube with the temperature sensor 6 on the back wall of the baking chamber 1 in connection. Furthermore, said handle 5 acts over the temperature control range below the minimum power of the Burner assembly 4, i.e. between about 150 and 50 C, in connection old a corresponding training of the regular pension 3

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to an electrical switching element 7 ″ in, with which the electric motor a fan θ is put into operation. This fan is designed as a radial fan, its bladed impeller rotates in a special sheet metal housing 9, which has several air inlets on its rear side is the fan (sheet metal) housing 9 in the lower part of the gas appliance (behind the so-called crockery trolley) arranged so that its air enters the 3? rie at the back, while its air outlet opening below the floor panel 2, which is provided with an upwardly pointing guide flank, into the baking chamber 1

Due to such an arrangement and training switches automatically changes in the temperature control range below the minimum power of the crash bucket 4, which is around 150 G called radial fan and transports outside air at room temperature into the baking chamber 1. This outside air Mixes itself at the point where it joins the baking chamber 1 with the heating gases of the burner 4 and rertoilt, if necessary supported by additional key measures, evenly on the entire baking chamber 1, the above a%. its back over an outlet opening 10 for the gas-air mixture. At this Discharge opening 10 can, as not detailed here, instead the one arranged in the lower part of the grass machine. Compressed air is on appropriately designed suction fans are used, which

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Just like the first-mentioned one for an even distribution around the Abtramsport de · infinitely adjustable to temperatures from 150 - 50 ⁰ · G eimregulbar as well as · the · temperature · sensor · 6 · thermotatically · monitored · gas-air mixture «orgt. Dememtaprechemd the entire device came out of the fan 8 and the housing 9 in the Torrn bucket separate structural unit and as such can even be retrofitted in the already Torhanden gas device without the need for special modifications.

6 claims,
1 figure.

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Claims (6)

Patent and other applications for use of the utility aid, Elektro-u, Gas-Armaturenfabrik GmbH., Hohenlimburg patent claims 1. Method aur expansion of the temperature control areas in gas-heated household »ovens, characterized in that the» heating gases generated over a »below the minimum power of the gas burner (4) located Hegel area with a certain amount by a fan (8) in the oven ( 1) conveyed outside air are mixed, this gas-air mixture flows evenly through the baking chamber (1) and releases it again through its exhaust opening (10) to the outside. 2. The method according to claim 1, characterized in that the heating gases of the burner (4-), which are proportionally regulated as a function of the set baking chamber temperature, are mixed with a constant volume of air from the outside. 3. The method according to claim 1, characterized in that the heating gases of the burner, which is kept constant at minimum output, (4) τοη externally an BATH ORIGINAL * 10 - 309836/0195 1. is mixed. 4. Gas oven for carrying out the process according to claims 1 to 3, characterized by a pressure fan on the lower part of the gas oven or a suction fan with its suction cup (10) arranged radial fan (B). 5 · Gas oven for carrying out the «procedure» after »A» - • prüche »1 bi · 3» characterized by a «radial fan designed ·· fan (8), de ···» inlet opening on the housing »u» ge »» Also on the outside rich »u» d de ··· »Auetriff * öff» u »g. • on the side underneath the · with a guide flaake Tereehe »ea Bodenbleehe (2) in the baking room« (f) borders. 6. Gas oven for carrying out the method according to claims 1 to 3t characterized by an electrical switching element (7) coupled to the thermostat-controlled regulating valve (3) which controls the fan motor (8) within the Torgeseheaea control range ia operation sets. BATHROOM 0RK3INAL 309835/0195