CN2226906Y - Electric heat oven - Google Patents

Abstract

Electric heating oven, on the substrate with good insulation, prepare metal electrodes, electric heating film, and outer insulating layer in sequence to form an electric heating body and place it between the inner shell and the insulation layer; metal electrodes can also be directly prepared on the insulation layer, and then the electric heating film is prepared in turn , the outer insulating layer, which constitutes the electric heating body, is placed between the inner shell and the shell. The shape of the electric heater can be flat plate, corrugated surface or cylindrical tube, and can be placed on the bottom or side of the oven, or installed on the bottom, top and side of the oven at the same time. The oven has the advantages of uniform heating, fast temperature rise, simple manufacturing process, low cost, and electric heating elements in different parts can be individually replaced.

Description

Electric oven

The utility model belongs to an electric heating device, in particular for an electric heating oven.

The existing electric heating oven is composed of an inner shell, an electric heating body, a temperature controller, an insulation layer and a shell. The electric heating body adopts a nickel-chromium wire resistance device, which is usually placed at the bottom of the oven. The heating is uneven, the heating speed is slow, and the manufacturing cost higher.

The utility model adopts high-temperature electrothermal paint coated on the substrate or the surface of the insulation layer as an electric heating body to replace the resistance wire heating element. The purpose of this utility model is to make the electric heating oven evenly heated, increase the heating speed, and reduce its manufacturing cost.

The electric heating oven of the utility model includes an inner shell, an electric heating body, a temperature controller, a thermal insulation layer and a casing. Metal electrodes can be prepared on a substrate with good insulation performance, and an electric heating paint can be coated between two electrodes on the surface of the substrate to form an electric heating oven. The outer insulation layer is prepared on the surface of the electric heating film, and as an electric heating body, the electric heating body is placed between the inner shell and the insulation layer, and the electrode leads on the electric heating body are connected to the temperature controller. Metal electrodes can also be prepared directly on the insulation layer, and electrothermal paint is coated between the two electrodes on the surface of the insulation layer to form an electrothermal film. The surface layer of the electrothermal film is prepared with an outer insulating layer as an electric heating body, and the electric heating body is placed in the inner shell Between the electric heater and the shell, the electrode leads on the electric heating body are connected to the temperature controller.

The surface shape of the substrate or insulation layer coated with electrothermal paint is flat or corrugated to increase the heating surface area.

To facilitate disassembly and replacement, the shape of the base body can also be a cylindrical tube.

In order to make the heating uniform, the electric heating element prepared in the utility model can be placed on the bottom of the oven, or on the side of the oven, or on the bottom and the side of the oven at the same time, or even on the bottom, the side and the top of the oven at the same time.

Heat penetration perforations can be distributed on the inner shell of the electric heating oven.

In the electric heating oven of the utility model, the heating area of the electric heating body is large, the heating is uniform, there is no open flame, the heating speed is fast, and the cost of the electric heating paint is low. Replacement costs are substantially less than those required for resistance wire heating devices.

Fig. 1 is the electrothermal body whose surface shape is flat;

Fig. 2 is the electrothermal body whose surface shape of the base body is a corrugated surface;

Fig. 3A is the electrothermal body whose base shape is a cylindrical tube;

Fig. 3B is a cross-sectional view along line A-A of Fig. 3A.

Fig. 4 is the overall schematic diagram of electric heating oven;

Fig. 5 is a schematic cross-sectional view of an electric oven wall in which the electric heating paint is directly coated on the insulation layer;

Fig. 6 is a sectional view of the oven wall when the cylindrical tubular electric heater is used in the electric oven.

As can be seen from Figures 1 and 2, electrodes 4 are prepared on a flat or corrugated substrate 1, and electrothermal paint is coated between the electrodes to form an electrothermal film 2, and an outer insulating layer 3 is prepared on the surface to form an electrothermal body. Ceramic plates are available. FIG. 3A and FIG. 3B show the case where the substrate is a ceramic tube. The electrode can be a strip-shaped or ring-shaped silver paste electrode, or it can be pasted on the substrate with a copper sheet of a corresponding shape. The electrothermal paint coated between the electrodes is 100 parts by weight of graphite powder, 30 parts of zinc powder, 20 parts of barium plumbate, 10 parts of antimony dioxide, 20 parts of copper oxide, 10 parts of chromium trioxide, 200 parts of silica sol, and 100 parts of water. The outer insulating layer is made of a mixture of silica sol and titanium dioxide. The above-mentioned electric heating body can be placed on the five surfaces of the electric heating oven shown in Figure 4 at the same time except the door above, below, left, right, and rear, and placed between the inner shell and the insulation layer, and the electrode leads are connected in series or in parallel. Then connect to the thermostat. Fig. 5 shows the section of the wall of the electric heating oven. In this example, the metal electrodes are directly prepared on the insulation layer 8, and the electric heating paint is coated between the two electrodes to form the electric heating film, and then the outer insulating layer is coated. Among the figures, 6 represents the electric heating film plus the outer insulation layer. The insulating layer is then placed between the inner shell 7 with heat perforations and the oven shell 5 .

Fig. 6 shows the situation that the prepared circular tubular electric heater 9 is arranged on the wall of the electric oven, and the electric heater 9 is placed between the inner shell 7 and the insulation layer 8 with heat penetration perforations, and the oven shell 5 is outside the insulation layer, each The electrode lead wires on the electric heating body can be connected in parallel or in series, and then connected to the temperature controller.

Claims (6)

1. an Electric heat oven comprises inner casing, electric heating element, temperature controller, heat-insulation layer and housing, it is characterized in that:

(1) prepare metal electrode on the matrix of good insulation preformance or heat-insulation layer, coated electric-heating coatings between matrix or insulation layer surface two electrodes forms Electric radiant Heating Film, and described Electric radiant Heating Film top layer prepares external insulation layer, as electric heating element;

(2) described electric heating element is placed in between shell and the heat-insulation layer, or is placed between inner casing and the housing, and electric heating element top electrode lead-in wire is coupled to temperature controller.

2. Electric heat oven as claimed in claim 1 is characterized in that described matrix or insulation layer surface are shaped as tabular or waveform curved surface shape.

3. Electric heat oven as claimed in claim 1 is characterized in that described base shape is a cylindrical tubular.

4. as claim 1,2 or 3 described Electric heat ovens, it is characterized in that described electric heating element can be placed in the baking oven bottom, also can be placed in the baking oven side, or be placed in baking oven bottom and side simultaneously, even be placed in baking oven bottom, side and top simultaneously.

5. as claim 1,2 or 3 described Electric heat ovens, it is characterized in that the diathermanous perforation that distributes on the described inner casing.

6. Electric heat oven as claimed in claim 4 is characterized in that the diathermanous perforation that distributes on the described inner casing.

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