JPS6242215B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a high frequency heating device for dielectrically heating an object to be heated housed in a heating chamber.

Conventional microwave ovens, which are high-frequency heating devices, for example, are equipped with a stirrer fan or a reflector inside the heating chamber in order to improve the distribution characteristics of the high-frequency waves supplied into the heating chamber and uniformly heat the object to be heated. The structure is such that the mounting table on which the object to be heated is placed can be rotated. However, while the dielectric heating of the object to be heated near the stirrer fan and reflector is good, uneven heating tends to occur in areas away from the stirrer fan and reflector, so it may be a good idea to also provide a rotating mounting table. However, this is undesirable from the viewpoint of cost and installation space, as the volume inside the heating chamber becomes smaller or the external shape of the main body becomes larger than necessary.

In addition, since the heating chamber has a cubic or rectangular parallelepiped shape, most of the high frequency waves supplied from the high frequency generator into the heating chamber are reflected many times on the walls of the heating chamber and then absorbed by the object to be heated. In addition to deteriorating efficiency, standing waves are generated within the heating chamber depending on the position of the reflected high frequency waves, and uneven heating occurs in response to these standing waves.

In order to prevent uneven heating of the heated object, if the heating chamber is made into a spheroid and a high frequency generator is placed at one focal point and the heated object is placed at the other focal point, theoretically the high frequency waves will interfere with each other after being reflected. However, compared to cubic or rectangular parallelepiped heating chambers, such heating chambers are difficult to create and cannot be mass-produced, resulting in high costs.

Further, as shown in FIG. 3, if the heating chamber upper wall 12 is sloped from the rear wall of the heating chamber to the opening 3 side,
Since the object to be heated 9 is placed on the mounting table 7 in the heating chamber 2 using the height l on the side of the opening 3 as a guide, the object to be heated 9 is placed at point m on the upper wall 12 of the heating chamber when the mounting table 7 rotates. There was a drawback that it could not be rotated smoothly if it hit.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to provide a high-frequency heating device that eliminates uneven heating of a heated object and that allows the heated object to be easily taken in and out of a heating chamber.

In order to achieve the above object, the high-frequency heating device of the present invention includes a heating chamber that accommodates an object to be heated, a high-frequency generator that supplies high-frequency waves into the heating chamber, and a mounting table rotatably provided within the heating chamber. The upper wall of the heating chamber is inclined from the rear of the heating chamber toward the opening, and is bent upward at any position between the center of the mounting table and the opening. This has the effect of improving the distribution characteristics of the high frequency waves supplied into the heating chamber, eliminating uneven heating of the object to be heated, and making it easier for the object to be heated to be taken in and out of the heating chamber.

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

In FIG. 1, reference numeral 1 denotes a main body of a high-frequency heating device, and a door 4 is provided in an opening 3 of a heating chamber 2 provided in the main body 1 so as to be openable and closable. Reference numeral 5 denotes an operation section provided on the front surface of the main body 1, and this operation section 5 is provided with a timer knob 6 for setting the cooking time and a plurality of operation switches. Reference numeral 7 denotes a low dielectric loss mounting table which is rotatably provided substantially in the center of the bottom wall 8 of the heating chamber, and the object to be heated 9 is placed on this mounting table 7. Reference numeral 10 denotes a magnetron used as an example of a high-frequency generator. The high-frequency waves generated by this magnetron 10 are supplied into the heating chamber 2 from a power supply port 13 provided on the upper wall 12 of the heating chamber through a waveguide 11, and then The heating object 9 is dielectrically heated. This heating chamber upper wall 12 is inclined slightly upward from the rear of the heating chamber 2 to a position facing the mounting table 7 on the side of the opening 3, and is tilted upward at an arbitrary position between the center and the end of the mounting table 7. It is bent and fixed to the opening peripheral plate 14 as shown in FIG. 15 is the power supply port 1 on the heating chamber upper wall 12
3, which is made of a material with low dielectric loss.

The operation of the above configuration will be explained below. First, open the door 4, place the object to be heated 9 on the mounting table 7 inside the heating chamber 2, close the door 4, set the heating time with the timer knob 6, and press the high frequency output operation button and the cooking start button. , the magnetron 10 operates to supply high frequency waves into the heating chamber 2, and the object to be heated 9 placed on the mounting table 7 is dielectrically heated while rotating. Then, when the time set in the timer has elapsed, the timer stops the operation of the magnetron 10, and the heating cooking ends. However, during this cooking process, the upper wall 12 of the heating chamber was slightly inclined upward from the rear of the heating chamber 2 toward the opening 3, and was further bent upward at an arbitrary position from the center to the end of the mounting table 7. Therefore, the distance between the mounting table 7 and the heating chamber upper wall 12 is l>o>m, where l is on the heating chamber opening 3 side, o is the center of the mounting table 7, and m is on the rear wall side. Since the reflection angles of the high-frequency waves supplied into the heating chamber 2 are different, the distribution characteristics of the high-frequency waves can be made approximately uniform, and since the object to be heated 9 is rotated, uneven heating of the object to be heated 9 can be prevented. It can be prevented.

Furthermore, by bending the upper wall 12 of the heating chamber upward so as to face the center and end portions of the mounting table 7, even if the peripheral edge of the mounting table 7 provided in the heating chamber 2 protrudes, the This has the effect that the object to be heated 9 can be easily placed on and taken out from the mounting table 7, and the object to be heated 9 placed on the mounting table 7 can be rotated smoothly.

As described above, according to the present invention, the following effects can be obtained.

1 The upper wall of the heating chamber is sloped upward from the rear of the heating chamber toward the opening, and is further bent upward at any position between the center of the mounting table and the opening, making it easy to take in and out the heated object. Moreover, since the reflection angle of the high frequency waves supplied into the heating chamber is different from the rear wall side to the front wall side, the high frequency distribution characteristics are improved, and the cooking table can be rotated to perform cooking. Cooking can be done even more evenly.

2. By providing the bent portion of the upper wall of the heating chamber closer to the opening than the center of the mounting table, the height of the object to be heated can be regulated before placing it on the mounting table.
Therefore, it becomes possible to smoothly rotate the object to be heated placed on the mounting table.

[Brief explanation of the drawing]

Fig. 1 is a side cross-sectional view of a high-frequency heating device showing an embodiment of the present invention, Fig. 2 is a plan cross-sectional view taken along line A-A' in Fig. 1, and Fig. 3 is a high-frequency heating device showing a conventional example. FIG. 2... Heating chamber, 7... Mounting table, 10... Magnetron (high frequency generator), 12... Upper wall of heating chamber.

Claims (1)

[Claims] 1. A heating chamber that accommodates an object to be heated, a high frequency generator that supplies high frequency waves into the heating chamber, and a mounting table that is rotatably provided in the heating chamber, and the upper wall of the heating chamber is connected to the heating chamber. The high-frequency heating device is configured to be inclined upward from the rear toward the opening side, and bent upward at any position between the center of the mounting table and the opening.