JP2538585B2 - High frequency heating device door structure - Google Patents

Description

Description: [Object of the Invention] (Industrial field of application) [0001] The present invention relates to a door structure of a high-frequency heating device for heating an object to be heated housed in a refrigerator with high-frequency heat and heat from a heater.

(Prior Art) It is known that a microwave oven (high-frequency heating device) includes an oven range as well as a single-function range.

The single-function range has a structure that irradiates the inside of the microwave with only microwave cooking. In addition to such a structure, the microwave oven has heaters 2, 2 on the upper and lower portions of the heating chamber 1 as shown in FIG.
Is provided so that an oven using the heat of the heater and grill cooking can be performed.

In all of these microwave ovens, a transparent window 4 is provided at the center of a door 3 (which opens and closes the opening of the heating chamber 1).

Conventionally, only the screen 5 having a large number of punched holes formed on the plate surface has been used as the transparent window 4, but the punched holes are apt to rust due to steam or dirt generated during cooking. Then, as shown in FIG. 4, the screen 5
In addition to providing the inner barrier 6 on the side surface inside the cabinet, an outer barrier 8 is provided on the front surface of the door plate 7.

In the drawings, 9 is a door sash, 10 is a contact piece formed on the outer peripheral portion of the screen 5 through a step 5a protruding toward the heating chamber 1 (the front plate of the heating chamber 1 when the heating chamber 1 is closed).
1a), 11 is a microwave cabinet,
12 is an operation panel.

By the way, since the inside temperature of the single-function range and the oven range are significantly different (the heating temperature of the heater is much higher than that of the high-frequency heating), the inner barrier 6 is selectively used.

Specifically, conventionally, a polyethylene film, which is inexpensive in terms of cost, is used as the inner barrier 6 in a single-function range that requires a relatively low temperature. However, the polyethylene film cannot be used in the microwave oven in which the high temperature continues due to the use of the heater 2, and the tempered glass is used as the inner barrier 6.

(Problems to be Solved by the Invention) However, if the inner barrier 6 is used properly even with the door 3 of the same microwave oven as described above, there is a problem that the cost of the product inevitably increases accordingly.

Moreover, in addition to such cost, in the microwave oven, the surface temperature of the door 3, that is, the surface temperature of the outer barrier 8 and the door sash 9 is likely to be considerably high due to the thermal conductivity of the tempered glass during cooking in the oven and grill. For this reason, there is a risk of burns, and there is a demand for a material capable of suppressing the increase in cost due to the inner barrier 6 while including the above.

The present invention has been made in view of such a problem, and an object thereof is to reduce the surface temperature of the door while keeping the same inner barrier in a wide temperature range from low temperature to high temperature. It is to provide a door structure for a high-frequency heating device that can be used.

[Structure of the Invention] (Means and Actions for Solving Problems) In the present invention, the inner barrier 6 is formed from an aromatic polysulfone resin or an aromatic polyketone resin having high heat resistance and low thermal conductivity. , The inner barrier 6 is shared from a single function to a multi-function in which the inside of the refrigerator becomes hot.

(Embodiment) Hereinafter, the present invention will be described based on an embodiment shown in FIGS. 1 and 2. In the drawings, the same parts as the parts described in the above-mentioned "Prior Art" are designated by the same reference numerals, and the description thereof will be omitted. In this part, different parts, that is, essential parts of the invention will be described. To

That is, in one embodiment, the inner barrier 6 is made of an aromatic polysulfone resin.

More specifically, a plate-shaped polyether sulfone film is placed on the entire side surface of the screen 5 inside the heating chamber (on the side of the heating chamber 1) and heat-welded (or adhered with a heat-resistant adhesive) to form an inner barrier. 6 is set. But in this case,
The inner peripheral edge of the inner barrier 6 reaches the stepped portion 5a which is the outer peripheral edge of the screen 5, and the contact piece 10 is in contact with the front plate 1a of the heating chamber 1 from the front plate 1a. It is designed to be separated.

Here, the polyether sulfone film has a high continuous use temperature of about 180 ° C and is chemically stable,
Since it has a property that it is hardly attacked by solvents and oils, it can be understood that it can withstand even a microwave oven where high temperatures are continuous.

Therefore, the common inner barrier 6 can be used in both the single-function range and the microwave oven.

However, since the inner barrier 6 is not required to be used properly, the product cost can be reduced.

Moreover, the polyether sulfone film can not only share the inner barrier 6 but also suppress the rise of the surface temperature of the door 3 during the cooking of the oven and the grill. That is, according to the experiment, when the conventional tempered glass and the polyether sulfone-based film of the present invention are used under the condition that the food is cooked in the microwave oven using the heater 2, the central portion of the outer barrier 8 is used. As a result of measuring the temperature of, since the polyether sulfone film has lower thermal conductivity than the tempered glass, it is better to use the polyether sulfone film represented by the solid line as shown in FIG. The surface temperature was much lower than that of the one using the tempered glass shown. Of course, the same can be said for the door sash 9, and the occurrence of burns can be prevented.

In addition, the polyether sulfone film is not easily scratched, and has the advantage that it is easy to handle because it is light in weight.

In addition, in this case, the inner barrier 6 is provided so that the outer peripheral edge portion thereof reaches the step portion 5a which is the outer peripheral edge portion of the screen 5, so that it is difficult to peel it off, and the contact piece 10 of the heating chamber 1 is provided. Contact with front plate 1a (heating chamber 1 closed)
Since it is separated from the front plate 1a, it has an advantage that it is more difficult to peel off and is less likely to receive heat from the front plate 1a.

Although the aromatic polysulfone-based resin is used in the above-described embodiment, an aromatic polyketone-based resin may be used.

Specifically, a polyether ether ketone-based film is heat-welded or adhered (by a heat-resistant adhesive) to the side surface of the screen 5 to form the inner barrier 6, as in the embodiment. Polyetheretherketone-based film has a high continuous use temperature of about 240 ° C, is chemically stable, and has the property of not being attacked by most solvents and oils, and is more heat conductive than tempered glass. Since it is inferior in the property, the same effect as that of the embodiment is obtained.

[Effects of the Invention] As described above, according to the present invention, it is possible to commonly use the inner barrier over a wide temperature range from the low temperature to the high temperature.

Therefore, the product cost can be reduced. In addition, since the inner barrier has low thermal conductivity, it is possible to suppress an increase in the surface temperature of the door and enhance safety. Moreover, the inner barrier is less likely to be scratched and has an advantage that it is easy to handle because it is light in weight.

In addition, the inner barrier is provided so that its outer peripheral edge reaches the step which is the outer peripheral edge of the screen.
Since it is hard to peel off and is separated from the front plate of the heating chamber in the closed state of the heating chamber, there is an advantage that the peeling is more difficult and the heat from the front plate is less likely to be received.

[Brief description of drawings]

1 and 2 show an embodiment of the present invention.
FIG. 2 is a cross-sectional view showing the structure around the screen of the door, which is the main part of the present invention, and FIG. 2 shows the surface temperature of the door in comparison with the surface temperature of the door using conventional tempered glass as an inner barrier. Diagram, Fig. 3 is a perspective view showing a general microwave oven,
FIG. 4 is a cross-sectional view showing around the screen of the door. 1 ... Heating chamber, 1a ... Front plate, 3 ... Door, 5 ... Screen, 5a ... Step, 6 ... Inner barrier, 8 ... Outer barrier, 10
...... Contact piece.

Claims (3)

(57) [Claims] 1. A screen constituting a see-through window, and a screen provided on an outer peripheral portion of the screen via a step portion projecting toward the heating chamber. The screen is separated from a front plate of the heating chamber when the heating chamber is closed. And a contact piece that abuts the front plate in a state of being formed from an aromatic polysulfone-based resin or an aromatic polyketone-based resin, on the side surface on the heating chamber side of the screen,
A door of a high-frequency heating device, comprising: an inner barrier provided so that an outer peripheral edge portion reaches the step portion and the contact piece is separated from the front plate in a state of being in contact with the front plate. Construction. 2. The door structure for a high-frequency heating device according to claim 1, wherein the aromatic polysulfone resin is a polyether sulfone film. 3. The door structure for a high-frequency heating device according to claim 1, wherein the aromatic polyketone resin is a polyether ether ketone film.