SI9300662A - Arrangement for cleaning oven - Google Patents

Abstract

The invention relates to a cleaning arrangement for a cooking oven having a chamber (M), a heating element (R1, R2) arranged underneath the chamber (M) and, if necessary, a heating element arranged above the chamber (M). By means of a switching device (S), the heating element (R1, R2) arranged underneath the chamber (M) can be separately activated so that the heating element (R1, R2) arranged underneath the chamber (M) forms a temperature which evaporates a cleaning agent (R) brought into the chamber (M). This temperature lies approximately in the range from 50 to 70@C. The cleaning agent used is, for example, rinsing lye or an enamel cleaning agent. <IMAGE>

Description

BOSCH - SIEMENS - HAUSHALTSGERATE GMBH

The invention relates to an oven cleaning arrangement comprising an oven, a heater under the oven and a heater installed above the oven.

There are already known ovens which have both a heater under the oven and a heater above the oven, except for baking or cooking. other cooking in the oven is also used for the so-called catalytic automatic cleaning of the oven. The oven interior is brought to a high temperature (> 550 ° C) to remove any dirty spots from the inside walls of the oven.

This catalytic self-cleaning is associated with a number of disadvantages. First, it requires catalytic self-cleaning, as mentioned above, relatively high temperature. This temperature must be selected in such a way that, on the one hand, the desired cleaning effect can be achieved, but on the other hand, damage or damage can be avoided. the gradual destruction of the interior of the oven.

Catalytic automatic cleaning requires a great deal of energy input and is also associated with the further disadvantage that the oven cannot be used elsewhere for a relatively long cleaning time. This time consists of the time at which the operating temperature is generated, the time of actual cleaning, and finally the time required for the oven to cool to a temperature that permits the oven to be operated safely.

Based on this state of the art, the invention is based on the task of providing an arrangement of the type specified above, which facilitates the automatic cleaning of the oven.

This task is solved by the features of claim 1 according to the invention. The arrangement according to the invention is characterized in that only a relatively low operating temperature of about 50 to 70 ° C is required. The oven and especially the oven with this temperature, which lies far below the maximum operating temperature e.g. for certain flowering and baking processes, they are not affected. Properly relatively low cleaning temperatures require only a short time to clean so that the oven can be used for the intended purpose for a sufficiently long time.

Another particular advantage of the arrangement according to the invention is the low energy consumption required for cleaning.

The invention will now be described on the basis of the drawings.

That's how they portray

Figure 1 is a perspective view of an oven of an arrangement oven according to the invention; and

Figure 2 Switchgear arrangement according to the invention.

Figure 1 shows the M oven located in the electric oven. The arrangement according to the invention may, however, be used generally in connection with ovens. The M oven is square shaped. There is a recess in the area of its floors, especially the tub W, which is intended to receive a detergent R such as e.g. flushing lye ah enamel cleaners. Oven M and bathtub W may be formed in one piece, alternatively a separate bathtub W may be provided.

Under the M oven, in the known manner, an electric heater is provided in Fig. 1, which causes the bottom to be heated for the flow of the boiling water. baking done in the oven. This heater is designed in particular by two heating rods Rl and R2 which run approximately parallel along the side edges of the bottom of the oven and are controlled by the switchgear shown in Figure 2.

The oven may have a further unheated heater (FIG. 2 in Figure 1) to cause heating from above, and may be used for boiling or baking processes. firing with switchgear S (Fig. 2) simultaneously activates the heaters R1, R2 under the oven M and the heated heater above the oven M, in order to supply the substances which are boiling or boiling. furnaces, simultaneous heating from below and from above. In doing so, the two heaters (RO; R1, R2 in Figure 2) can be designed for different power. If necessary, the heating from below and from above for the sake of frying and baking can be adjusted individually in the predefined power range.

The electrical control under the oven M of the installed heater will be explained on the basis of Figure 2.

In the tub W brought or. The cleaning agent R applied to the bottom of the oven was heated with heat R1, R2 under the oven M and finally evaporated. In particular, the heater R1, R2 installed under the oven causes different temperatures between the two subsequent periods, which first heat the detergent R and finally evaporate.

For example, a flushing lye or an enamel cleaner is used as the R cleaner. For example, the first time period is in the range of 3 to 4 minutes, while the second time period is in the range of 5 to 8 minutes. During the first period, the impurities in the area of the bottom of the oven or the oven are dissolved by heating the cleaner R. bathtub W. During the second period, the evaporated R cleaner arrives directly on the oven walls and the upper oven cover and has an effect on the impurities present there.

Figure 2 shows a switching device S which can be activated separately under the oven M by the installed heater R1, R2 in such a way that it causes this temperature to evaporate into the oven M the cleaning agent R supplied,

Switching device S consists of a control element B, which may, for example, be made by a rotary knob, a keyboard key or another control element.

In addition, the switching device S may comprise a circuit Z which activates, triggered by manually operating the control element B, the heater R1, R2 in such a way that it causes the heater R1, R2 in different periods of time in the following periods, the temperature being in the second period ( absorption phase) higher than the temperature in the previous period (heating phase).

The evaporation temperature is, for example, 50 to 70 ° C.

The evaporated detergent causes the impurities on the side walls and the ceiling of the oven M. to be removed. If necessary, any remaining impurities can be removed relatively manually.

An electric heater installed under the oven is indicated by the ohmic resistors RI and R2.

The switching component Z may be further designed in such a way that, for regular cooking and baking purposes, the ovens, incorporated by proper operation on the control element B, can activate the heating element RI, R2 for heating from below with above via the switch SW3. Oven RO heaters for heating from above.

Switching component Z controls two switches SW1 and SW2 and thus their alignment with each other. to the voltage U..

In the first switch position (SW1: 1, SW2: 1) the heating elements are connected in parallel; in the second switch position (SW1: 2, SW2: 2) the heating elements are connected in series. With the first switch position, depending on the absolute values of the ohmic resistors RI and R2, a higher heating output is produced than in the second switch position.

Only the heating element RI can be activated in the third switch position (SW1: 1, SW2: 2) and only the heating element R2 in the fourth switch position (SW1: 2, SW2: 1). Depending on the design of RI and R2, further (first and second) temperatures may be formed at the pre-set operating voltage U for the heating and evaporation phase.

Independently of these switching options (sequential / parallel coupling of RI and R2 and optionally connection of RI or R2), a switching device (S) may be formed by controlling the RI, R2 heater at the first and / or second temperature.

These control courses (first to fourth switching position; clocking) are controlled temporarily by switching component Z in such a way that the heating phase (first time period) is limited to 3 to 4 minutes, while, in particular, the next absorption phase ( second time period) limited to a further 5 to 8 minutes.

Claims (5)

Patent claims An arrangement for cleaning an oven comprising an oven, a heater placed under the oven and, if necessary, a heater mounted above the oven, characterized in that it comprises a switchgear (S) which can be provided with a heating device (R) under the oven (M). R2) activates separately in such a way that under the oven (M) the heater (R1, R2) forms the first temperature to evaporate the cleaner (R) in the oven (M). Arrangement according to claim 1, characterized in that a heater (R1, R2) under the oven (M) can be activated by a switching device so as to form a heater (R1, R2) under the oven (M) during the first time period. a second temperature lower than the first temperature, and during the second period the first temperature. Arrangement according to one of the preceding claims, characterized in that it consists of a heater (R1, R2) of two electric heating elements (R1, R2) which can be switched on by a switchgear (S) optionally in parallel or in series. Arrangement according to one of the preceding claims, characterized in that the switchgear (S) is formed by controlling the heater (R1, R2) at the first and / or second temperature. Arrangement according to one of the preceding claims, characterized in that it comprises an oven (M) tub (W) for receiving a cleaner (R).