DE2109269A1 - Oven or other oven for the - Google Patents

Description

Dipl.-Ing. H. MITSCHERUCH 8 MONKS 22,

■ _. . ■ ■ «^« ... ^. * ^ ». _B i. ^ * T. _aL Sieinsdorfstrasse 10

Dipl.-Ing. K. GUNSCHMANN ™ Brille .. (οβΐ _υ · 2 »« β4 Dr. rer. nat. W. KÖRBER PATENT LAWYERS February ^{26, 1971}

Gu / Hi

Ets. Eugene Scholtes
Lagrange-Thionville (Moselle)
France

Patent application

Oven or other oven for domestic use

use

The invention relates to an oven or other oven for domestic use, the heating elements of which electrical resistors or rows of gas burners.

In particular, the invention relates to an oven of this type, in which certain walls as cavity walls to form a or a plurality of cooling chambers are formed in which an air circulation is generated by means of a fan, a fan or the like.

Such a design has already been proposed for ovens in which an automatic cleaning process takes place by pyrolysis or heat treatment under the effect of prolonged heating at a relatively high temperature. In view of the need in such an oven for the cleaning process by pyrolysis high temperature cooling of the walls is necessary in particular for the case that the furnace is to be installed in a closet or ¹ enqueued between other devices or pieces of equipment. However , cooling the oven walls is also useful in other cases and even when the oven is not set up for cleaning by pyrolysis. However, the designs known hitherto for this purpose do not guarantee a satisfactory one

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Cooling the entire walls of an oven.

The invention is therefore based on the object in an oven of the specified type with side walls designed in a manner known per se as hollow walls to form cooling chambers, into which cooling air is sucked in via openings in the front wall under the oven door by means of a ventilator or ventilator is promoted upwards to enable efficient cooling of the furnace walls and at the same time other improvements to realize.

The solution to this problem is, according to the invention, that the oven door is also formed as a double-walled hollow wall a cooling chamber with air inlet openings and air outlet openings arranged in each case on the lower edge and on the upper edge thereof is trained.

According to a further feature of the invention are under the control buttons and control organs or devices and just above the top of the oven door one or more additional ones Air inlet openings attached through which not only fresh outside air, but also air from the cooling chamber the oven door and, if necessary, vapors from the oven compartment can be drawn in when the oven door is halfway or a little is open.

In the case of an oven or other oven designed in this way, the oven door is also cooled, as a result of which the heat radiation is too high to the outside world is avoided.

The design is preferably such that a cooling air circulation is also formed on the rear wall of the furnace, as a result of which cooling of all walls of the furnace is made possible.

Further features and advantages of the invention emerge from the following description of the examples in the drawing illustrated embodiments of an oven.

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In the drawing show:

Figure 1 shows a first embodiment of the furnace in the front view,

Figure 2 shows a cross section along the line II-II of Figure 1,

FIG. 3 shows a section corresponding to FIG. 2 with a half-open front door flap,

FIG. 4 shows a section along the line IV-IV of FIG. 2,

FIG. 5 shows an enlarged vertical section through the door flap of the furnace, and FIG

Figure 6 shows a cross section through another embodiment of the oven.

In the embodiment of the oven according to the invention shown in FIGS. 1 to 5, they are the baking chamber. 1 delimiting inner walls with the exception of the front wall, on which the access opening for the baking chamber which can be closed by means of a door flap 3 is arranged, surrounded by a heat-insulating lining 2, which is clad to the outside by the outer side walls and the outer rear wall of the oven. The outer side walls are formed in a known manner g as hollow walls for the formation of cooling chambers 4, in which an air circulation takes place. For this purpose, each of these side walls can be formed by two sheet metal walls 4a and 4b which are spaced apart from one another and parallel to one another.

In a similar way, the bottom wall of the oven is designed as a hollow wall made of the two metal sheets 5a and 5b, which enclose a ₄ lower air inlet chamber 5 between them. This is in communication with the lateral cooling chambers 4 and forms an air intake chamber which is in communication with the outside air through a series of openings 6 arranged in a sheet metal 7.

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At their upper ends, the two lateral cooling chambers 4 are connected to an upper suction chamber 8, through which air is sucked in that is circulated in the two cooling chambers. The connection of the two cooling chambers 4 to the upper suction chamber 8 takes place through openings 9 which are arranged at the upper end of the inner sheets 4b of the two outer side walls.

The upper suction chamber 8 is by two at some distance one above the other arranged horizontal sheets 8a and 8b, of which the upper sheet 8b is provided with an opening 10 is. Through this opening, the upper suction chamber 8 is in communication with a fan 11 through which the upper part of the The oven is sucked in and pushed away. The fan 11 is arranged in an upper space 12 of the oven housing, in or on which the control and actuation devices for the oven can also be attached.

In the embodiment according to FIGS. 1 to 5, the air sucked in by the fan 11 is discharged via a vertical pipe 13 which penetrates the upper wall of the furnace housing and opens into an exhaust gas recovery vent or a chimney vent. The air is sucked in in the direction of the arrows F ₁ through the openings 6 in the lower part of the front of the oven and introduced into the side cooling chambers 4 in the direction of the arrows Fp. After flowing through the same, the air reaches the upper suction chamber 8 in the direction of the arrows F, flows through the fan 11 and is finally discharged through the pipe 13 in the direction of the arrow F ^.

According to a particular feature of the invention, the front door flap 3 is also designed so that it has a cooling chamber contains. For this purpose, the door flap can be provided with two glass panes which are arranged at some distance from one another and parallel to one another 14a and 14b, between which the cooling chamber 14 is formed and which are fastened by means of a plurality of connecting pieces 15, one of which forms a peripheral frame 16. At its lower edge, the frame 16 has a number of openings 17 that allow outside air to be drawn in.

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Corresponding openings 17a are also arranged in the adjacent part of the other connecting pieces. Furthermore are on upper edge of the frame 16 and the other connectors Openings 18 and 18a attached, which allow the outflow of air from the cooling chamber 14 of the door flap 3. Between the lower edge of the door flap and the sheet metal 7, which forms the lower part of the front surface of the furnace body, is a small one leave free space. With this design, external air can thus pass through the openings 17 and 17a in the direction of the arrow Fn (FIG. 2) penetrate into the cooling chamber 14.

The suction of air into this cooling chamber is made possible by the fact that the upper part of the cooling chamber is connected to the upper suction chamber 8 when the door flap 3 is closed. Here, the openings 18 in the upper part of the frame 16 are opposite to corresponding openings 19 which are made in the adjacent edge of the lower plate 8 a of the suction chamber 8. The air sucked into the cooling chamber 14 of the door flap 3 in the direction of the arrow F ₁ - can therefore flow into the suction chamber 8 in the direction of the arrow F / -.

According to a further feature of the invention, one or more suction openings 20 just above the door flap 3 and slightly below the control buttons 21 and possibly C of other operating or regulating elements, for example a clock 22, are arranged on the front of the oven in the upper area thereof are attached to the front wall 23 of the upper space 12. Outside air is sucked in through the openings 20 in the direction of the arrows F ₇ and F _Q , as a result of which an air flow is generated in front of the front side of the door flap 3 and the cooling thereof is improved. In addition, the air sucked in horizontally in the direction of the arrow Fg forms to a certain extent a barrier between the heat released in the region of the door flap 3 and the operating devices arranged on the upper front wall 23 of the furnace housing.

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When the oven is being used, the door flap 3, as shown in FIG. 3, can be kept half-open so that the vapors developed during baking can escape. Such vapors are sucked in via the openings 19 and 10 in the direction of the arrows Fq and F ^ _Q (FIG. 3), flow through the upper suction chamber 8 and are discharged via the pipe 13. In this way it is avoided that the vapors developed during baking escape freely into the kitchen.

Furthermore, the oven according to the invention is designed so that its rear wall 24 (FIG. 3) is also affected by a flow of cooling air is cooled. For this purpose, the rear wall can also be a hollow wall with two spaced apart parallel to each other Be formed sheets. Since the oven is generally set up against a wall M, the rear wall can be seen from Figure 3 can be seen, also consist of only one sheet, in the bottom and top passage openings 25 and 26 opposite the lower air inlet chamber 5 and the upper suction chamber 8 are arranged. In this embodiment, in the cavity 27 between the wall M and the simple rear wall 24 of the furnace housing a flow of cooling air in the direction of arrows F ^ and F ^ p generated, which causes a cooling of the rear outer wall of the oven and prevents too much heat on this becomes free.

In the embodiment shown in Figure 6, the oven according to the invention is particularly for installation in a wall cabinet or some other covering or designed to be placed between other kitchen appliances. Here differentiates this embodiment differs from the embodiment according to Figures 1 to 5 essentially only in that the cooling air is not through an exhaust pipe, but through the upper part the front wall is discharged through in front of the furnace housing. To this end, the upper space contains 12 of the furnace housing a fan 11a, the suction opening of which is the same as in the first embodiment over one in the upper sheet 8b of the upper Suction chamber 8 a attached opening 10 is, but the outlet opening is connected to a tube 13 a, which is in the

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Upper part 23 of the front wall of the furnace housing arranged openings opens in front of the same to the outside. As FIG. 6 shows, these openings can preferably be formed by slits 28 arranged one above the other, the lower edge of which is bent outwards and upwards. These superimposed edges form deflection strips 29, by means of which the air flowing outwards is deflected upwards in the direction of arrow F. The outlet slots 28 can be arranged on one side or the other of the operating buttons 21 or of the regulating devices, for example the clock 22. Preferably, they are attached of the upper part 23 in the central region, while the operating devices on the one side of the slots and the control devices are arranged like on the other side of the slots, as shown in FIG. 1

With regard to the uniformity of the furnace production, the furnace housing in the embodiment according to FIGS. 1 to 5 can preferably be designed in the same way as in the embodiment according to FIG. The outlet slots are simply not used when the air is discharged through an upper exhaust pipe 13. A fan 11 or 11a is used depending on the application.

Due to the particular arrangement of the exhaust ports 28 is for the arranged on the upper part of the oven Bedie-% non-voltage devices is the risk that they are exposed to the released heat of the pressed-out air that has been brought about the cooling of the furnace walls. An oven designed according to FIG. 6 can also be arranged without danger between items of equipment or kitchen appliances A and B, which can be arranged both above and below the oven, as well as on both sides thereof. The ventilation system provided ensures adequate cooling of the furnace walls in any case and prevents adjacent items of equipment from being damaged or burned by heat, even if they are made of easily combustible material.

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Furthermore, the effective cooling achieved by the invention enables that in the oven according to the invention automatic cleaning by pyrolysis, i.e. by prolonged heating in the interior of the baking chamber at a relatively high level Temperature in the order of magnitude of e.g. 500 ° can take place. Here, too, is particularly in the embodiment according to Figure 6, in turn, any risk of damage or any risk of fire to neighboring equipment is avoided, even if it is in close contact with the furnace housing are arranged.

In such a case, the ventilation cooling system in the Control circuit of the oven must be included if it is an electric oven in the older one Application No. 6 902 725 dated February 6, 1969 described Art acts. The fan 11 or 11a of the cooling system can can be arranged in an additional branch of this circuit, through the main control button and a switch can be closed, which closes automatically as soon as the cleaning process begins by pyrolysis. For this purpose, this switch can preferably be formed by the thermostat, which is used to switch on the beginning the cleaning process is provided by pyrolysis in the oven described in the application mentioned.

The circuit of this oven contains a thermostat, which is designated in the earlier application with 8a and which is used to open a circuit that actuates the lock of the oven door as soon as the temperature inside the oven has exceeded a normal maximum limit of 300 °, for example. In the oven according to the invention, the thermostat provided according to the earlier application can be replaced by a thermostat which controls a changeover contactor in such a way that this opens the control circuit for the lock of the oven door as well as the closure when the normal temperature limit is exceeded of the additional circuit that feeds the cooling fan.

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This automatically activates this fan as soon as the pyrolysis cleaning process begins, without any action on the part of the operator. The cleaning by pyrolysis can not only with the oven according to Figure 6, but can also be provided in the oven according to FIGS. 1 to 5. It can also be used with a gas oven as well as with an electric oven. On the other hand, there is the application of the ventilation cooling system to the oven according to the invention not tied to an oven which is designed for cleaning by pyrolysis.

The described embodiments can in many respects, depending on the application, can be changed without departing from the scope of the invention.

Expectations;

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Claims (3)

- ίο - Expectations Oven or other oven for domestic use with designed as cavity walls to form cooling chambers Side walls, in which through openings in the front wall under the oven door by means of a ventilator or ventilator Cooling air is sucked in and conveyed upwards, characterized in that the oven door (3) is also double-walled Hollow wall to form a cooling chamber (14), each of which is arranged on the lower edge and on the upper edge of the same Air inlet openings (17, 17a) and air outlet openings (18, 18a) is formed and that under the control buttons (21) and regulating organs or devices and one or more just above the top of the oven door additional air inlet openings (19, 20) are attached through which not only fresh outside air, but also air from the cooling chamber of the oven door and possibly vapors from the oven (1) can be sucked in when the oven door is half or a little open. 2. Oven according to claim 1, characterized in that it has a lower air inlet chamber (5) in its lower part contains, which is in communication with the cooling chambers (4) of the side walls (4a, 4b) and with one or more air outlet openings (25) is connected in the lower part of the rear wall (24), which is also in its upper part above the Baking chamber (1) is provided with air passage openings (26) so that a flow of cooling air on the outside of the rear wall of the oven is produced. 3. Oven according to claim 1 or 2, characterized in that it contains an upper suction chamber (3) serving to suck in air from the cooling chambers of the furnace walls, which extends over the entire horizontal furnace measurement and with the Fan (11 _P 11ε) 10383 6/1 on communicates in a space (12) above the upper Is arranged suction chamber. Oven according to one of the preceding claims, characterized in that the cooling air from the cooling chambers of the Oven walls is discharged through outlet openings (28) in the upper part (23) of the front oven wall, which is above the oven door (3) are attached essentially at the same height as the control buttons (21), which in turn on the one or the other side of the outlet openings or optionally both sides of the same are arranged. Oven according to one of claims 1 to 3 »characterized in that that the cooling air is discharged from the cooling chambers of the furnace walls through a flue pipe (13), which the upper furnace wall penetrated and opens into a smoke outlet or a chimney. Oven according to one of the preceding claims, in which the heating elements consist of electrical resistors and the oven for automatic cleaning of the inner walls delimiting the baking chamber by pyrolysis and extended heating is set up at elevated temperature, characterized in that its control circuit for the automatic ^ Commissioning of the fan (11, 11a) is set up and 'this commissioning at the beginning of the cleaning process brought about by pyrolysis and guaranteed until the end of this process. The patent attorney 109836/1024 Blank page