SI9400074A - Stoves with rotatable installed heating body - Google Patents

Abstract

The invention relates to an oven muffle (1) with at least one heating element (2) mounted in the muffle interior so as to be pivotable parallel to a muffle wall situated at a short distance therefrom. According to the invention, the pivoting axis of the heating element (2) is arranged outside the plane formed by the heating element (2). In particular, the heating element (2) is mounted on a pivot realised in the form of a knife-edge bearing. The pivoting mechanism is of structurally simple and largely wear-free design. The heating element can be relatively easily pivoted owing to the negligible friction. <IMAGE>

Description

BOSCH-SIEMENSHAUSGERATE GMBH

Furnace muffle fitted with a rotating heater

The invention relates to a furnace muffle according to the first patent claim.

Baking furnaces are already known, in which in addition to baking or baking. otherwise, the preparation of dishes in the muffle is also used for the so-called catalytic self-cleaning of the muffle using a heater located under the muffle as well as above the muffle mounted heater. The interior of the muffle is brought to a high temperature (> 550 ° C) to remove contaminated sites on the inner walls of the muffle.

Furthermore, there are known furnaces in which one or more heating elements are housed within the muffle, particularly closely below and parallel to the muffle ceiling, so that manual cleaning of the muffle ceiling is not possible or is only possible to a limited extent. For this reason, such furnaces have a catalytic screen sheet between the ceiling of the muffle and the heater.

Catalytic self-purification is associated with a number of disadvantages. Catalytic self-purification first requires, as mentioned earlier, a relatively high temperature. This temperature should be selected in such a way that the desired cleaning effect can be achieved on the one hand, but on the other hand it can avoid damage or damage. the gradual destruction of the interior of the furnace.

Catalytic self-cleaning requires high energy consumption and is also associated with the further disadvantage that furnaces cannot be used elsewhere for relatively long periods of time. This time consists of the time during which the operating temperature is restored, of the time of cleaning itself, and finally of the time required to allow the furnace to cool again to a temperature which permits safe operation of the furnace.

German patent application DE 37 23 628 already discloses a microwave oven with a radiant heating unit which runs parallel to the ceiling of the heating chamber in the heating chamber of the microwave oven and is pivotally mounted on the back wall of the heating chamber with its end pieces. The axis of rotation lies in the plane formed by the unit of the heater. The rotary unit consists of a rotary piece that is connected to the end pieces of the heater body and a bearing housing that surrounds the rotary piece and is formed by two bearing clamps. The rotary unit is thus relatively complex in its mechanical structure. In addition, it is subject to wear and tear. In addition, there is friction in rotary movements, which makes rotation difficult. Based on this state of the art, it is an object of the invention to provide a furnace muffle, which is of the first named type and whose twist mechanism is constructed in a simple manner.

The present invention is solved by the features of the first claim.

The furnace muffle heater according to the invention can be simply twisted, with the rotational motion practically dependent solely on the weight of the heater body; there is only a small amount of friction in the rotational motion. A further advantage is that a structurally simple twist mechanism is not subject to any significant wear and tear. The furnace muffle according to the invention can be made using commonly available heating elements for furnaces equipped with a flange.

Further preferred embodiments of the invention are indicated in the sub-claims.

The invention is now described on the basis of the drawings.

Figure 1 is a perspective view of a furnace muffle with the heater rotated to an offset position; and Figure 2 is a side view of the heater in the position of Figure 1.

Muffle 1, presented in Figure 1, is housed in an electric furnace. However, the embodiment of the invention can generally be used in conjunction with furnaces. The muffle 1 is shaped like a square. The heater body 2 in the area of the muffle ceiling serves to produce the upper heat and can occupy two specific positions 2.1 and 2.2: in position 2.1, the heater body is positioned parallel to the muffle ceiling and slightly off from the muffle ceiling, and in position 2.2 the heater is rotated obliquely towards the bottom. muffles. In this position, the muffle ceiling is freely accessible.

The heater body 2 is substantially flattened. There is e.g. from multiple elements guided in multiple envelopes, the heater body with flange 23 (Figure 2). The handle 3 positioned in the plane of the heater mainly serves to manually position the heater in positions 2.1 and 2.2.

According to the invention, the axis of rotation of the heater body 2 is positioned out of the plane formed by the heater body 2. In this case, the heater body 2 may be mounted in a pivot which is made as a bearing with the blade.

As presented in FIG. 2, the flange 23 of the heater body 2 has an edge forming a blade 24. This blade is mounted in a pan 11 which is mounted on the back wall of the furnace muffle 1. In the embodiment shown in FIG. 2, the pan 11 forms part 4.

Part 4 serves as the guide of the flange 23 and thus of the heating body 2. It is mounted on the back wall of the furnace muffle 1 and is, for example, curved in the manner shown in FIG. 2. It has a V-shaped cross section with one arm connected to the back wall of the muffle furnace. The free ends of both arms are bent inwards. Part 4 exists e.g. made of bent sheet metal. In its lower region, as mentioned above, part 4 forms a pan 11 receiving the blade 24; part 4 in its upper region forms a stop stop 41 for flange 23.

The flange 23 thus engages the curved part 4 so that the heating body 2 with the flange 23 in part 4 occupies at least two specified positions 2.1 and 2.2.

The flange 23 in the first position 2.1 closes the openings 12 provided for the heater 2 in the rear wall of the furnace muffle 1.

In the first position 2.2, the flange 23 closes the openings 42 provided for the heater body 2 in the curved part 4.

In the muffle 1 according to the invention for the oven, the heater 2 in its first position 2.1 is arranged for use according to the purpose (heating, cooking of the dishes) parallel to the ceiling of the muffle.

In this position, the heater 2 with the mounting element 7.1, 7.2 is held on the ceiling of the muffle.

The mounting element 7.1, 7.2 exists in the embodiment shown in FIG. 2 from mounting plate 7.1 and from the corresponding screw 7.2 with the ribbed head. This allows the heater to be tool-free and easily rotate downwards as well as fasten to the ceiling of the muffle.

The mounting element 7.1, 7.2 is preferably located in the vicinity of the feed opening on the front of the muffle 1 of the furnace, that is, on the side opposite the axis of rotation, centrally centered on the front of the muffle of the furnace. A screw 7.2 with a ribbed head is secured to the support of the heater body 2. There are also two recessed and directional muffles directed towards the ceiling of the heater 8, 9. They are mounted on one side of the heater body, ie left and right with respect to the opening for insertion (Fig. 1) of the muffle furnace. The screw 7.2 with a ribbed head connected to the mounting plate 7.1 and the slots 8 and 9 ensure a secure holding of the heater parallel to the ceiling of the muffle, ie in position 2.1, thereby ensuring a permanent connection of the furnace regulator.

The catalytic intermediate plate may be retrofitted and fixed between the heater in its position 2.1 and the ceiling of the muffle.

The heater body is therefore mounted in the guide portion 4 in the rear region of the furnace muffle 1 on its rear wall rotating between positions 2.1 and 2.2. The axis of rotation of the heater body is positioned outside and above the plane formed by the heater body 2.

Guide angle 5 which, when installing the heater, shown in FIG. 2, it lies outside the muffle 1 of the furnace and serves as a screen and guide for electrical cables. 6 indicates a tube for a thermostat sensor provided in the plane of the heater or parallel to it.

Claims (12)

PATENT APPLICATIONS A furnace muffle with at least one inside the muffle (1) parallel to the spatially insignificantly spaced wall of the muffle with a rotatably mounted heater body (2), wherein the heater body (2) consists of multiple heater elements which are guided in several sheaths and emits a flange (23), characterized in that the axis of rotation of the heater body (2) is positioned out of the plane formed by the heater (2). Oven muffle according to claim 1, characterized in that the heating element (2) is mounted in a pivot which is made in the form of a bearing with a blade. Furnace muffle according to one of the preceding claims, characterized in that the flange (23) of the heating body (2) has an edge forming the blade (24) and that the blade (24) is mounted in the pan (11) which is mounted on the back wall of the muffle (1) of the furnace. Furnace muffle according to one of the preceding claims, characterized in that a curved part (4) is formed on the back wall of the furnace muffle (1) which forms a stop limiter (41) for the heating body (2). Oven muffle according to claim 4, characterized in that the curved part (4) forms a pan (11). Furnace socket according to one of Claims 4 or 5, characterized in that the flange (23) engages in the curved part (4) and that the heating body (2) with the flange (23) in the curved part (4) occupies at least two specified positions (2.1, 2.2). Oven muffle according to claim 6, characterized in that the flange (23) in the first position (2.1) closes the openings provided in the rear wall of the muffle (1) for the heater body (2). Oven muffle according to one of Claims 6 or 7, characterized in that the flange (23) in the second position (2.2) closes the openings provided for the heating body (2) in the curved part (4). Oven muffle according to one of Claims 7 or 8, characterized in that the heating element (2) is positioned parallel to the ceiling of the muffle in its first position (2.1) and that the mounting body (2) and / or ceiling of the muffle is provided with a fastening an element (7.1, 7.2) holding the heater body (2) in the first position (2.1) and allowing it to rotate. Oven muffle according to claim 9, characterized in that the fastening element (7.1, 7.2) consists of a fastening plate (7.1) and a screw (7.2) with a ribbed head. Oven muffle according to one of Claims 9 or 10, characterized in that the mounting element (7.1, 7.2) is located near the insertion opening. Furnace muffle according to claim 11, characterized in that the fastening element (7.1, 7.2) is arranged centrally in the vicinity of the inlet opening and that two openings (8, 9) are directed towards the heating body (2). ceiling muffles and are located each on one side of the heater.