DE8716665U1 - Oven with a cooking chamber that can be closed by an oven door - Google Patents

Description

BOSCH-SEMENS HOUSEHOLD APPLIANCES GMBH "* " 8ÖÖ0 Munich 80, 14.1.2.1987

Hochstrasse 17

TZ? 87/625 Thi/hO

Oven with a cooking chamber that can be closed by an oven door

The innovation relates to an oven with a cooking chamber that can be closed by an oven door, primarily for cooking food using microwave energy or combination heating, with the oven door having a see-through window.

As a result of the cooking of the food, the moisture in the food produces water vapor, possibly relatively significant fumes, with condensation forming at the coolest points in the cooking chamber. When cooking using a microwave, the oven door is the relatively coolest part of the cooking chamber that is prone to condensation. Condensation therefore often forms on the inside of the see-through window, which affects the transparency of this window.

It is common practice in microwave ovens to direct an air stream from the magnetron's cooling device against the inner surface of the viewing window. A fan is required to generate a usable air stream. The chances of success depend very much on the temperature of the air stream, which is often not high enough to prevent condensation during short microwave cooking times.

TZP 87/625 &igr;

The innovation is based on the task of using simple technical means to create an I

To prevent condensation on the inside of the see-through window of the cooking chamber: §

dem. I

W The new arrangement for solving this problem is characterized by |

net that a meandering electrically conductive |

Side facing the cooking chamber, the ladder-bearing glass pane side.

presents. I

Advantageous embodiments of the innovation are contained in the subclaims. |

An example of implementation according to the innovation is shown below in the drawing gj

described in more detail. It shows: 1

Fig. 1 Transparent window with vertical conductor tracks, I

Fig. 2 Transparent window with horizontal conductor tracks. f

According to the representation in Figure 1, a furnace door 1 is provided with a viewing window |

ster 2, on which vertically running meandering conductor tracks 3 are applied i

are arranged. |

The illustration in Fig. 2 shows the variant for horizontally running meandering |

shaped conductor tracks 4. |

The conductor tracks 3, 4, which are preferably applied to the side of the viewing window facing the cooking chamber, reliably prevent fogging of the viewing window 2. Both the vertical and the horizontal arrangement of the conductor tracks 3,
4 allow an unobstructed view, since the conductor tracks 3. 4 are located peripherally
and the viewing area is less congested. The innovation, which is primarily for
Microwave ovens and combination ovens with microwaves are to be used,
also takes into account the fact that the middle of the sheath is heated more strongly.
the window temperature reaches the necessary condensate-preventing temperature,

■ - * ■■ ·

TZP87/625

The heating power is switched off. Detection of glass damage, if it separates the conductor tracks, is also provided. Both the heating power shutdown and the damage detection can be implemented using a measuring bridge circuit-*.

The contacting of the conductor tracks 3, 4 is carried out depending on the opening axis of the door and the corresponding, jsvüsHs shortest; Laiieriängs

Claims (5)

■ * * a TZP 87/625 TM/hü Protection claims 1. Oven, PMt a cooking chamber that can be closed by an oven door, primarily for cooking food under the influence of microwave energy or combination heating, v/o the oven door has a see-through window, characterized in that a meander-shaped electrically conductive thin conductor track (3, 4) is applied to the see-through window (2), whereby preferably the side of the see-through window that faces the cooking chamber represents the side of the glass pane that carries the conductor track. 2. Oven according to claim 1, characterized in that the conductor track (3) is arranged in vertically running meanders, which thicken peripherally, on the viewing window (2). 3. Oven according to claim 1, characterized in that the conductor track (4) is arranged in horizontally running meanders, which become denser at the periphery, on the viewing window (2). 4. Oven according to claim 1, characterized in that the heating power is switched off after reaching a predetermined viewing window temperature. 5. Oven according to claim 1, characterized in that the conductor strips (3, 4) destroyed by the breakage of the viewing window signal an operational fault.