JPS59139592A - Heating cooking device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The invention relates to a heating oven having a high-frequency heating device and a resistive heating element, in particular a high-frequency heating device and a resistive heating element, in particular for pyrolytic self-cleaning. The present invention relates to an oven door comprising an external door frame, an internal door frame, a window, a heat-resistant window glass for shielding microwaves, and a perforated metal grate, and a heating cooking device equipped with an internal microwave shield.

Conventional configuration and its problems In the above-mentioned heating oven, which is a combination of high-frequency heating and resistance heating, care must be taken to prevent heat from the heating chamber on the one hand and electromagnetic waves on the other hand from being released to the outside through the oven door. There must be. To prevent this, a perforated metal sheet is generally provided behind the internal pane of heat-resistant glass, which metal sheet is usually permanently fixed to the internal door frame, for example by welding.

In order to obtain the best possible transparency through the metal sheet, openings are arranged in the metal sheet in the form of a dense network, and the openings cannot exceed a predetermined size due to the intensity of the microwaves. Since the surfaces of the door parts usually have an enamel coating, the internal width of the opening is reduced by the enamel coating and the transparency is considerably impaired.

OBJECTS OF THE INVENTION The object of the invention is to provide a cooking device of the above-mentioned type, in which the metal sheet is passed through in the same way as the surface treatment of the door parts, in order to obtain optimum transparency.

SUMMARY OF THE INVENTION According to the present invention, the above object is to provide a high frequency heating device and a heat resistant heating element for shielding external door frames, internal door frames, windows and microwaves, especially with a resistance heating element of a pyrolytic self-cleaning basin. This is accomplished by an oven door consisting of a window pane and a perforated metal grate, as well as a cooking device with an internal microwave shield. According to this configuration, the metal sheet can be prefabricated separately from other parts of the door and can be treated with a surface finish, for example a black chrome cover, which narrows the inner diameter of the opening punched into the metal sheet. Optimum transparency can be guaranteed without any problems. Only in the final assembly step is the metal sheet joined to other parts of the door, such as enamelled parts.

In another preferred embodiment of the invention, the microwave shield, which is in the form of a frame and constitutes the innermost part of the door, surrounds the heat-resistant pane at its outer edge and is located near the innermost part of said heat-resistant pane. The edges of the metal sheet and the frame edges of the heat shield hold the pane at the outer periphery of the sealing. Three basic parts of the oven door are installed in one installation operation, a prerequisite for optimizing microwave shielding. The microwave shield thereby forms the innermost boundary of the oven door and no special fittings are required in the area of the viewing window.

Description of examples The invention will be explained by means of embodiments shown in the drawings.

In the two embodiments shown in FIGS. 1 and 2, the heating oven door consists of the following basic parts: an external opening frame 1 and an external frame 3 holding an external window pane 2; around the ring seal 7 on the circular edge of the window hold two internal panes 5, 6, and the pane combination 4 consisting of the panes 6 and 6 is placed on the external frame 3. . Furthermore, connection angle 8. A heat shield 9 in the shape of a frame and a perforated metal sheet 1 that press the door sealing 1o against the external frame 3
2 and an internal heat-resistant pane 13 having a seal 14. A hookper 15 having a hole 16 in which several article support members (not shown) are cut is placed on the inner surface of the heating oven door by a method not shown. Screws 17 are used to connect the coupling angle 8 to the external frame 3, while the external frame 8 is connected to the external frame 3, for example at point 18, and the external frame 8 is welded to the heat shield 9, for example at point 18. 2 shown in Figures 1 and 2.
In one embodiment, the ends are the edge 9' of the heat shield 9 and the microwave shield 1 of the heat shield 9.
1' and the edge 11' of the microwave choke 19, the bent door edge prevents microwaves from leaking. In either case, the metal sheet is provided with closely spaced apertures (closely meshed), said apertures having an inner diameter that prevents leakage of microwaves through the window.

In the embodiment of FIG. 1, the heat shield primarily has an rZJ-shaped coupling edge 91 that is straight. The microwave shield 11 is primarily double "L" shaped and has an edge 111 curved to the outside of the door, said edge into which a seal 14 can be inserted into the double rLJ shape at its end with a metal sheet. Bend at its ends so that the edge 1
21 is the heat shield 9, the joining edge 91 joins to the microwave shield 11 which is screwed around the window. Inside the window glass 13 is a second sole 14 surrounding the window.
The seal 14 is placed opposite the window glass 13 and is strongly pulled by a tension frame 24. In both embodiments, the metal sheet 12 is constructed as a separate part, the surface of which is treated by a special method, for example black chrome plating, and connected to the other parts of the door in the final assembly process. In the illustrated embodiment, the structure forming the heat shield 9° microwave shield 11 and metal sheet 12 is different from that of FIG. The parts are connected by screws at point 23 for direct metal contact. Unlike FIG. 1, in FIG. 2 the heat shield 9 has connection points 2
It has a connecting portion 92 that protrudes in an rLJ shape on the outer periphery of 3.

This connecting portion 92 is connected to the seal 14 and the window glass 131, respectively.
It acts as a counter-holding member or a stopping member for. Between this rLJ-shaped connection 92 and the seal 14 is located an edge 122 of the metal sheet 12 that partially surrounds the seal 14. The vertical edge 122 of the metal sheet 12 is connected to the connecting portion 92 of the heat shield 9 and the microwave shield 11.
is located between the longitudinal edges of and is in tension. Unlike the embodiment shown in FIG.
is not guided behind the seal 14, but is slightly bent,
Frame edge 1 on the inner surface of the window pane 13 forming an edge
23 and forms the border of the heating oven door.

Effects of the Invention As described above, according to the present invention, a metal sheet can be manufactured in advance separately from other parts of the door, and the inner diameter of the punched opening can be made thicker by surface treatment, making it easier to see from the outside. . It also has a high radio wave shielding effect.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a main part of an open heating oven door according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a main part showing another embodiment of the present invention. 1...Perforated frame, 2...Window glass,
3... External frame, 4... Window glass combination, 5, 6... Internal window glass, 7...
-...Ring seal, 8...Connection angle, 9
... Heat shield, 10 ... Door sealing, 11 ... Microwave shield, 1"
N...Perforated metal sheet 13...Heat-resistant window glass, 14...Seal, 15...Hook bar, 1ra...Hook, 17・・・・・・
screw. (Name of Seri University: Patent attorney Toshio Nakao and 1 other person)
J i diagram

Claims (3)

[Claims] (1) It has a high-frequency heating device and a resistance heating element especially for pyrolytic self-cleaning, and also has an external door frame, an internal door frame, a window and a microwave-shielding heat-resistant window glass and a perforated metal plate. an oven door and an internal microwave shield, the metal plate being removably connected to the microwave shield as a separate component. (2) A patent claim in which the metal grate and the microwave shield are removably placed on a heat shield forming the bottom surface of the door, and the heat shield forms a microwave choke-like pocket with the microwave shield on the periphery of the door. The heating cooking device according to item 1. (3) The microwave shield, which has the shape of a frame and constitutes the innermost part of the door, surrounds the heat-resistant window glass at its outer edge and is located near the innermost part of the heat-resistant window glass, and is located at the edge of the metal sheet. The heating cooking apparatus according to claim 1 or 2, wherein the window glass on the outer periphery of the sealing is held by the frame edge of the heat shield.