JPS5919213Y2 - High frequency heating device with heater - Google Patents

Description

[Detailed description of the invention] The present invention relates to the configuration of a high-frequency heating device that has a built-in electric heater in the heating chamber and is capable of electrically heating the object to be heated. Ta,
The purpose is to improve the operability of operating switches, etc.

FIG. 1a shows the configuration of a conventional heating device of this type.

The object to be heated is placed inside the heating chamber 3 by opening and closing the door 2 by operating the bundle 1 which includes a latch mechanism and the like.

Although not shown, the heating chamber is equipped with a heater, and has a structure in which the high frequency generated by the Q high frequency generator 5 is introduced into the waveguide 4.

The user arbitrarily selects a heating method from these two heating methods by operating a knob 7 on an operation panel 6.

However, unlike conventional high-frequency heating devices, various knobs are required to operate the heater, such as a timer, a temperature regulator, or to switch the heater's strength up and down.
Operation panels have become complex and require a large amount of space.

Space problems have necessitated an increase in the volume ratio of the operating panel to the size of the heating chamber.

At this time, the conventional method of attaching the panel 6 to the front wall 8 of the heating chamber became inappropriate.

Fig. 2 shows a case where the operation panel is attached using the conventional method.As a result of the operation knob extending above the heating chamber upper wall 9, when operating the operation knob 7, the knob The entire portion was displaced, which worsened the feel of operation, and furthermore, the operation itself became uncertain, resulting in an extremely poor quality.

If assembly and adjustment were carried out using this method on the production line, the uncertainty caused a series of assembly and adjustment errors.

The present invention was devised under such circumstances, and it increases the strength of the heating chamber front plate 8 for mounting the aforementioned operation panel 6.
This ensures reliable operation of the control knob.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

3 is a heating chamber, 4 is a waveguide, and a flange 14 and screw holes 15 are provided on the outer end surface of the mounting portion of the high frequency generator.

6 is an operation panel, and 7 is an operation knob, which are the same as in the conventional example.

8 is a front plate of the heating chamber which forms the wall of the heating chamber and faces the door 2.

This front plate has bent flanges 10.1 on the upper and lower end faces respectively.
1 is provided.

Further, the operation panel 6 is fixed to this heating chamber front plate 8.

Reference numeral 12 is a heater that performs electric heating, and reference numeral 13 is a shield case that shields high frequency waves.

In addition to the above structure, in the present invention, a reinforcing plate 16 is provided to fix the screw hole 15 of the end flange 14 of the waveguide 4 and a part of the upper flange 10 of the front wall 8 of the heating chamber.

This reinforcing plate 16 is formed by punching and bending metal so that screws can be tightened between the flanges 10 and 14 without applying special stress.

Furthermore, the attachment part of the reinforcing plate to the flange 10 is made with a textured hole,
On the other hand, elongated holes are provided on the surface of the flange 14 facing the screw holes to absorb variations in the pitch when assembling the heating chamber front wall 8 and the waveguide 4, and conversely to make it possible to adjust the pitch to a constant pitch. ing.

With the above configuration, both ends of this reinforcing plate were screwed to the flanges 10 and 14, respectively.

With this configuration, we were able to achieve the following effects.

In other words, since the flanges 10 and 14 are made with reinforcing plates so that they can maintain the same pitch even when external stress is applied, the front wall 8 of the heating chamber is free from warping deformation above the upper plate 9 of the heating chamber. As a result, the operation panel 6 did not displace, the operation knobs could be operated reliably, and the feel of the operation was also very good.

According to the present invention, the following major effects could be brought about in a ripple effect.

FIG. 3 is a diagram showing the effect, in which "a" is the conventional method and "b" is the one according to the present invention.

According to FIG. 3a, when the heater 13 operates, the temperature gradually rises from its surroundings, and the heating chamber upper plate 9 expands due to the temperature and moves upward due to the gravity of the waveguide 4 and the high frequency generator 5. Generates sledding.

The amount of warpage is several mm or more, which causes a change in the shape of the heating chamber and changes the impedance to high frequencies.

Therefore, if high-frequency heating is performed immediately after electrothermal heating, this change in impedance changes the operating point of the high-frequency generator 5, resulting in unstable operation such as occurrence of moding and reduction in output.

When the reinforcing plate according to the present invention is used, the end flange 14 of the waveguide 4 (this part is the part where the displacement is large due to temperature change) is the same as the flange 1 of the heating chamber front plate 8.
0 and the front wall of the heating chamber 8 with screws to keep the pitch nearly constant.
This change can be suppressed by supporting it.

Therefore, changes in oven impedance at high temperatures are reduced, making it possible to operate the high frequency generator more stably.

Furthermore, the change in the tip flange 14 of this waveguide 4 is caused by the third change.
As shown in the figure, the front wall of the heating chamber warps at the same time (it warps toward the rear of the heating chamber at high temperatures).

) A hook 1 for regulating the closed position of the door in a latch mechanism, which is attached to the front wall 8 of a commonly used heating chamber.
7 to the rear.

As shown in the figure, when the hook 17 shifts backward, it is pulled toward the rear of the door 2 whose closed position is regulated by the key 18, and as a result, the gap 19 between the heating chamber front wall 8 and the door at high temperatures is reduced. shall be.

Therefore, the amount of heat during electric heating and high frequency during high frequency heating, that is, the amount of leakage, can be extremely reduced.

From this, we were able to significantly improve thermal efficiency during high-temperature operation and safety against high-frequency waves during high-frequency heating immediately after.

[Brief explanation of the drawing]

Fig. 1a is a perspective view of the main parts of a high-frequency heating device showing a conventional example, b is a diagram showing the displacement of the operation panel in the same conventional example, and Fig. 2 is a perspective view of a high-frequency heating device equipped with a heater showing an embodiment of the present invention. FIG. 3A is a side sectional view of the main part of the heating device, FIG. 3A is a diagram explaining the problems in the conventional example, and FIG. It is. 8...Heating chamber front wall, 9...Heating chamber upper wall, 10.11...Flange, 14...
End flange.

Claims (1)

[Scope of utility model registration request] A heater characterized in that a reinforcing plate directly mechanically connects a heating chamber front plate on which an operation panel is fixed and a waveguide attached to a heating chamber upper plate forming an upper surface of the heating chamber. Equipped with high frequency heating device.