DE29810093U1 - Safety circuit arrangement for extractor hoods or the like. - Google Patents

Description

98 361 Ju
Ruediger Jost

Description

Title: Safety circuit arrangement for cooker hoods &ogr;.gl.

The invention relates to a safety circuit arrangement for extractor hoods or the like.

For apartments in which an extractor hood or a similar device for extracting cooking fumes is installed in the kitchen and the kitchen is on the same floor or in the immediate vicinity of a tiled stove, wood-burning stove or open fireplace, there is a risk that if the extractor hood or similar and the oven or fireplace are operated at the same time, CO2 or even CO from the oven or fireplace will be drawn into the room as a result of the negative pressure in the room caused by the extractor hood or similar when the window is closed.

The invention is based on the object of creating a safety circuit arrangement for extractor hoods or the like, which automatically prevents the operation of the extractor hood or the like when the window is closed and allows it when the window is open.

This object is achieved according to the invention by the characterizing features of claim 1.

Appropriate further developments of the invention are characterized in the subclaims.

Advantages of the invention emerge from the following description of an embodiment based on the circuit diagram of a safety circuit arrangement shown in the drawing.

In the safety circuit arrangement shown in the drawing, a circuit board P contains a

Transformer T, a bridge rectifier B and a smoothing capacitor C, which together form a power supply.

Alternating current with a voltage of 230 V from the public network is applied to a terminal Ll. A fine-wire fuse F provided between the terminal Ll and the transformer T protects the transformer T against overload.

The secondary side of the transformer T carries alternating current with a voltage of 24 V. This voltage is rectified by a bridge rectifier B and smoothed with a smoothing capacitor C.

A proximity switch of a control element Q is attached to the fixed window frame, with a magnet attached to the window sash. When the window is closed, the control element Q is activated, whereby the current path to a comb relay K is interrupted at Ql. In this case, there is no voltage at the protective contact socket S to which the extractor hood or similar is connected.

If the window is opened, the control element Q is deactivated and the current path to the comb relay K is closed. The comb relay K is then activated and the current path to the safety socket is closed.

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Reference symbols

B Bridge rectifier

C Capacitor

F Fine fuse

K Comb relay

Ll clamp

N Neutral conductor

P board

Q Control element consisting of proximity switch and magnet

T Transformer

S protective contact socket

Claims (3)

Protection claims 1. Safety circuit arrangement for cooker hoods or the like, characterized by a control element (Q) attached to a window of the room with the extractor hood &ogr;. the like for actuating a comb relay (K) when the window is open, the arrangement being such that the comb relay (K) closes the current path to a socket (S) supplying the extractor hood or the like via a contact (Kl) when the window is open and interrupts it when the window is closed. 2. Circuit arrangement according to claim 1, characterized characterized in that the control element (Q) has a proximity switch and is connected to direct current with a voltage of, for example, 24 V via a transformer (T) and a bridge rectifier (B) with smoothing capacitor (C). 3. Circuit arrangement according to claim 1 or 2, characterized in that all switching elements, with the exception of the control element (Q), are arranged on a circuit board (P).