JPH0271022A - Oven - Google Patents

Abstract

PURPOSE:To eliminate a danger in which a screw is projected in the inside of a heating chamber and contrive the improvement of an endurance property by covering a face-like heater on the upper face of the heating chamber of the inside of an oven body by an attaching plate from above, and spot-welding the attaching plate and the upper face of the heating chamber to closely fix the face-like heater on the upper face of the heating chamber. CONSTITUTION:A face-like heater 14, an oven body 11, an attaching plate 15 can almost completely be integrated by spot-welding a plate body 13 of the upper end of a heating chamber 12 and the attaching plate 15 at important points, not to nearly produce gaps between the face-like heater 14 and the plate body 13 even if the temperature of the face-like heater increases. Accordingly, uniform heat distribution and high efficiency can be obtained in the inside of the heating chamber 12.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an open device used for heating food and the like.

2. Description of the Related Art A conventional open circuit equipped with a planar heater as a heat source is known, for example, as shown in FIG. 3. In the figure, reference numeral 1 denotes an open body in which a heating chamber 2 is formed, and a planar heater 4 is placed on the upper end tr1/L of the heating chamber 2 of the open main body 1. The heater 4 is covered from above by a mounting plate 5.

Reference numeral 6 designates screws that are fixed to the outer peripheral flange 5a of the mounting plate 5 and the 7 flange 1a on the outer periphery of the upper end of the open body 1.

Problem to be Solved by the Invention However, in such a conventional configuration, it is dangerous if the tip of the screw 6 protrudes into the inside of the heating chamber 2. Limited to part 1a.

It cannot be screwed in any other position. Furthermore, when installing the sheet heater 4 on the outside of the heating chamber 2 in order to heat the heating chamber 2 with the sheet heater 4,
The state of contact between the sheet heater 4 and the plate 3 has a very large effect on the heat distribution and thermal efficiency inside the 1X1 heat chamber 2, and the sheet heater 4 and the plate 3 must be in close contact. Otherwise, stable heat distribution and good thermal efficiency cannot be obtained. That is, even if the sheet heater 4 is in close contact with the plate 3 at the upper end of the heating chamber 2 when it cools down, as the temperature rises, a gap is created between the sheet heater 4 and the plate 3 at the insufficiently fixed part. ,
When a gap starts to appear, the sheet heater 4 and the plate 3 in that area
As the temperature difference between the heating chamber 2 and It was difficult to get into the state. In addition, the transmission from the sheet heater 4 to the plate 3 becomes extremely poor due to the gap, resulting in a significant decrease in thermal efficiency. From this point of view, the above-mentioned installation using screws does not provide sufficient adhesion between the sheet heater 4 and the plate 3, resulting in P! p! distribution,
There is a limit to the improvement of thermal efficiency t0 The present invention is intended to solve all of these problems, and its entire purpose is to provide an opening with stable heat distribution and improved thermal efficiency.

Means for Solving Section +3 In order to solve this problem, the present invention brings a planar heater into contact with the upper surface of the heating chamber inside the open main body, and also attaches a mounting plate to the planar heater from above. This mounting plate and the upper surface of the heating chamber are spot welded to tightly fix the planar heater to the upper surface of the heating chamber.

Function: With this configuration, the mounting plate that holds the sheet heater is fixed by spot welding instead of screws.
It solves the problem of danger caused by screws protruding into the heating chamber, and furthermore, the mounting plate can be fixed at any position by spot welding, making it possible to use a planar heater. This means that it can be supported stably, resulting in uniform heat distribution and high thermal efficiency. As a result, the time required to reach the required temperature within the heating chamber becomes shorter. In addition, due to improved thermal efficiency, there is no need to make the temperature of the sheet heater higher than necessary, and the temperature of the entire sheet heater becomes uniform.
Therefore, durability performance can be improved. Furthermore, as mentioned above, fixing the mounting plate by spot welding is easier to automate than fixing with screws and can reduce costs.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings.

In FIGS. 1 and 2, 11 has a heating chamber 12 inside.
This open body 1 is formed by
A planar heater 14 is mounted on a plate 13 covering the upper end of the heating chamber 12. This planar heater 14 is covered from above with a mounting plate 15 made of a heat-resistant sheet metal material such as stainless steel or aluminized steel plate, and seven flange 16 around the mounting plate 15 are opened. The mounting plate 15 and the plate body 13 are attached to the upper end of the open main body 11 by spot welding the mounting plate 15 at a suitable position in the circumferential direction from above the flange 16 of the mounting plate 15 in an overlapping state with the outer peripheral part of the plate body 13 interposed therebetween. It is integrally attached to the 7 langes 17. The X portion 18 in FIG. 1 is a spot weld. In the embodiment shown in the drawings, a hole 14a is formed in the center of the planar heater 14, and the central protrusion 15a of the mounting plate 15 is fitted into the hole 14a.
a and the plate body 13t- are also spot welded. by the way,
As shown in FIG. 2, the planar heater 14 has 3N mica plates 19.20 and 21 ffi in the vertical direction, and an iron-chromium wire 22 is attached to the central mica plate 20. 20t - It is insulated by sandwiching it between upper and lower mica plates 19 and 21.

According to the above configuration, by spot welding the plate 13 at the upper end of the heating chamber 12 and the mounting plate 15 at key points, the planar heater 14, the open main body 11, and the mounting plate 15 can be almost completely integrated. Even if the temperature of the sheet heater 14 rises, almost no gap is created between the sheet heater 14 and the plate 13. Therefore, uniform heat distribution and high thermal efficiency can be obtained inside the heating chamber 12.

The portion of the mounting plate 15 to be spot welded can be appropriately selected by providing holes 14a in the planar heater 14 as shown in the same paper.

Effects of the Invention As described above, according to the present invention, the mounting plate covering the planar heater is fixed by spot welding rather than screwing. This problem can be solved, and since the mounting plate can be fixed at any position by spot welding, the planar heater can be fully supported stably, resulting in uniform heat distribution and high thermal efficiency. As a result, the time required to reach the required temperature within the heating chamber becomes shorter. Further, due to the improvement in thermal efficiency, it is not necessary to make the temperature of the planar heater higher than necessary, and the temperature of the entire planar heater becomes uniform.9th, durability performance can be improved. Further m
By fixing the mounting plate by spot welding as described in 1 above, it is easier to automate and reduce costs compared to screw fixing.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a longitudinal sectional view of the oven, FIG. 2 is an exploded perspective view of the main part, and the third factor is a longitudinal sectional view of an open oven in a conventional example. 11...Open main body, 12...Heating chamber, 13...
・Plate body, 14... Planar heater, 15... Mounting plate,
16.17...Flange. 18...Spot welding part.

Claims (1)

[Claims] 1. Place the planar heater in contact with the top surface of the heating chamber inside the open main body, cover this planar heater with a mounting plate from above, and spot weld the mounting plate and the top surface of the heating chamber to attach the planar heater. An open door that is tightly fixed to the top of the heating chamber.