JPS62218736A - Microwave heating device - Google Patents

Abstract

PURPOSE:To provide a micro-wave heating device comprising a gasket arrangement for a mounting table having a superior air-tight characteristic with quite less variability in manufacturing by a method wherein a gasket is integrally insert molded at a peripheral part of the mounting table with a liquid silicon rubber. CONSTITUTION:A gasket 2 is integrally insert molded around a periphery of a mounting table 1 made by crystal glass or else with liquid silicon rubber or by an injection molding or compression molding process. A part of a heating chamber wall 7 is narrowed and a supporting part 8 for the mounting table 1 is arranged. The tip of the gasket 2 is bent along the heating chamber wall 7, press contacted with the heating chamber wall 7 under a resiliency of the rubber so as to make an air-tight constitution for preventing water, oil and dew from entering the lower part of the heating chamber 6. A stage difference between the mounting table 1 and an interface line of the gasket 2 is made less, whereby stain is hard to collect at the end surface of the gasket 2 at the inner periphery of the mounting table 1, the maintenance of the device is facilitated, a striking of the table-ware against the end surface is prevented, a hanging of the table-ware during maintenance is prevented, a peeling-off of the gasket 2 is prevented and at the same time an air-tightness can be kept for a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a sealing structure of a table for placing nine food items in a high-frequency heating device, and relates to a high-frequency heating device having a gasket structure that is inexpensive and has excellent sealing performance. Related to the device 0 Conventional technology In general, the configuration of the food mounting table in a high-frequency heating device is as follows.
As shown in Figures 9 and 10, heat-vulcanized silicone rubber, which is a material with elasticity and good high frequency characteristics such as silicone rubber, is placed around the plate-shaped mounting table 1 made of a material such as crystallized glass. There is a method of constructing the gasket 2 made by extrusion molding by applying an adhesive 3 to the end surface of the mounting table 1 and pasting it, or, although it is not so commonly used, a Place the mounting table 1 between the mold 4 and the lower mold 5, inject room temperature curing silicone rubber in a vacuum chamber, leave it with the mold attached for half a day or more to solidify, and then integrally mold the gasket 2 on the mounting table 1. There is a way.

Problems to be Solved by the Invention However, the configuration of such a mounting table has the following problems. In the configuration shown in FIG. 9, it takes time and effort to bond, etc., and it is difficult to seal the abutting portions of some corners. Furthermore, with respect to processing variations in the external dimensions of the mounting table 1, since the gasket 2 of a fixed shape is bonded, the external dimensions including the gasket 2 around the mounting table after adhesion tend to vary.

Therefore, when the mounting table is attached to the heating chamber wall, the pressure of the gasket portion against the heating chamber wall varies, making it difficult to ensure a constant airtight performance. In addition, the configuration shown in Figure 11 requires many molds, resulting in poor productivity and very high cost.Also, since room temperature curing silicone rubber has low tear strength after solidification, two parts of the gasket are removed during manufacturing. Another problem is that during use, the airtightness tends to deteriorate due to scratches, cracks, and tears.

The present invention solves these conventional problems, and provides a high-frequency heating device that takes advantage of the elasticity of rubber and has a gasket structure for the mounting table that has excellent airtightness with extremely little processing variation. It provides:

Means for Solving the Problems In the high-frequency heating device of the present invention, a gasket around the mounting table is formed by insert molding using liquid silicone rubber, and the gasket is installed in the heating chamber of the gasket. The previous shape has the upper end surface at the same height all around, and at least three sides have flat parts on the upper end surface,
The thickness of the tip of the gasket in contact with the upper surface of the mounting table on the inner periphery of the gasket is 0.5 mm or less, and the difference in level between the mounting table and the gasket is reduced.

Function The high-frequency heating device of the present invention has a structure in which a gasket is formed by insert molding around a mounting table made of crystallized glass or the like using liquid silicone rubber, and can be made by injection molding or compression molding. I can do it. Therefore, a gasket can be formed around the mounting table within a few minutes, and it can be mass-produced and provided at low cost. In addition, the molded gasket has the same strength and heat resistance as conventional gaskets made of extruded heat-curable silicone rubber.

It has good electrical properties, chemical resistance, weather resistance stability, etc., and also has strong gasket adhesion to the mounting table. Also,
The upper end surface of the gasket should be at the same height all around, and at least 3
By forming the sides with a flat portion on the upper end surface, the parting lines of the mold are on the same plane, making it easy to create the mold, and making it possible to form a uniform gasket with good moldability. In addition, by setting the thickness of the gasket tip that is in contact with the top surface of the mounting table on the inner circumference of the gasket to 0.5 mm or less, and reducing the level difference between the boundary line between the mounting table and the gasket, dirt will not accumulate on the end face of the gasket around the inside of the mounting table. It is hard to clean and easy to clean. In addition, it is possible to prevent the gasket from being torn off due to tableware hitting the end face or being caught during cleaning, and airtightness can be maintained for a long period of time.

Moreover, by forming the gasket by integral molding, there is no problem with the airtightness of a part of the corner.

Embodiment Hereinafter, a high-frequency heating apparatus according to an embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, a gasket 2 is integrally molded using liquid silicone rubber around a plate-shaped mounting table 1 made of crystallized glass. The liquid silicone rubber is a mixture of two liquids, liquid A and liquid B, which is injected from the gate after a mounting table is attached to the mold. An outline of the curing mechanism of liquid silicone rubber is shown below.

Temperature (80 to 170°C) The cross-sectional shape of the gasket 2 integrally molded around the mounting table 1 is as shown in FIGS. 2 and 3.
The B-B/ and C-α cross sections are shaped as shown in Figure 2, and D in Figure 1.
The -α cross section has the shape shown in FIG. The total thickness H of the gasket 2, which will be explained below with reference to FIGS. 2 and 3, is the same height on all four sides. In addition, a flat part is provided on the upper end surface of the gasket 2, and the thickness h of the tip of the gasket 2 that is in contact with the upper surface of the mounting table 1 on the inner circumference of the gasket 2 is set to 0.5++IIm.
The shape is as follows, and the height difference between the boundary line between the mounting table 1 and the gasket 2 is reduced. Next, a description will be given with reference to FIGS. 4 to 7. FIG. 4 is a front cross-sectional view of the high-frequency heating device. A gasket 2 is integrally molded around the mounting table 1, and the mounting table 1 is installed in a heating chamber 6. The shape of the second part of the gasket after installation is shown in FIG. 6 with part b enlarged. A support part 8 for the mounting table 1 is provided by narrowing a part of the heating chamber wall 7. The tip of the gasket 2 is bent along the heating chamber wall 7 and pressed against the heating chamber wall 7 by the elasticity of the rubber, preventing water, oil, juice, etc. from entering the lower part of the heating chamber 6 partitioned by the mounting table 1. The structure maintains airtightness to prevent FIG. 6 is a side cross-sectional view of the high-frequency heating device in the direction of arrows. The shape of the gasket part 2 on the door 9 side is shown in FIG. 7 with part 0 enlarged. A mounting table 1 support part 11 is provided by bending the front end of the heating chamber front wall 1o. The side and bottom surfaces of the gasket 2 touch the heating chamber front wall 1 due to the elasticity of the rubber.
The structure is such that it comes into pressure contact with o. Note that, as shown in FIG.
The shape of the lower surface can be omitted.

In this way, the gasket 2 can be integrally molded around the mounting table 1 by injection molding or compression molding, and can be molded within a few minutes, making it extremely easy to mass produce and providing it at low cost. . In addition, the molded gasket 2
As with the conventional gasket 2 extruded from heat-vulcanized silicone rubber, good results can be obtained in terms of strength, heat resistance, electrical properties, etc. In particular, the characteristics required for a gasket are hardness 5oHs, tensile strength 60/- or more, elongation 2
A result of 00- or more has been obtained. Also, in terms of high frequency characteristics, it can be mounted on a high frequency heating device and achieves SOO with no load.
No abnormality was observed in the second part of the gasket even after continuous operation for more than an hour. In addition, by integrally molding the mounting table 1 into which it is inserted, the gasket 2 formed around the mounting table 1 is not affected by variations in the external dimensions of the mounting table 1.
The external dimensions including the parts are constant. Therefore, it is possible to stably secure the pressure contact with the heating chamber wall 7, and it is easy to ensure airtightness.0 In addition, the total thickness H of the gasket 2 is made to be the same height on all four sides, and the upper end surface part a has a flat surface. By providing the parts, the parting lines of the molds are on the same plane, making it easy to create molds, and forming a uniform gasket with good moldability. Also, the shape of the tip of the gasket 2 can be maintained without damaging it. Furthermore, there is no gap in fitting the right and left corners of the gasket 2 facing the door 9 into the heating chamber wall 7, and the appearance is improved.

In addition, the thickness h of the tip of the gasket 2 that is in contact with the upper surface of the mounting table 1 on the inner circumference of the gasket 2 is set to 0.5 mm or less, and the mounting table 1
By forming a shape that reduces the level difference between the boundary line between the gasket 2 and the gasket 2, it becomes difficult for dirt to accumulate on the end face of the gasket 2 around the inside of the mounting table 1, making it easy to clean. Further, it is possible to prevent the gasket 2 from being torn off due to the end face being hit by a tableware or being caught during cleaning, and airtightness can be maintained for a long period of time.

Effects of the Invention As described above, the high-frequency heating device of the present invention uses liquid silicone rubber for the gasket of the mounting table, and integrally forms the gasket around the mounting table by insert molding.
The entire circumference of the upper end surface of the gas depletion y) should be at the same height, and at least 3
The sides have a flat part on the upper end surface, and the thickness of the tip of the gasket in contact with the upper surface of the mounting table on the inner circumference of the gasket is 0.5 mm or less. It has excellent strength and other properties, is easy to care for, and can maintain airtightness for a long time. In particular, according to the present invention, it is easy to create a mold, and since it can be integrally molded by injection molding or compression molding, it is extremely suitable for mass production and can be provided at low cost, which is extremely advantageous in practice. It is.

[Brief explanation of drawings]

FIG. 1 is a plan view and a front view of a high-frequency heating device according to an embodiment of the present invention, in which a gasket is integrally formed on a mounting table;
Figures 2 and 3 are enlarged cross-sectional views of the same essential parts, Figure 4 is a front cross-sectional view of the same high-frequency heating device, Figure 5 is an enlarged view of the same main parts, and Figure 6 is an enlarged view of the same high-frequency heating equipment. 7 is an enlarged sectional view of the same essential parts; FIG. 8 is a sectional view of the gasket portion of another embodiment; FIG. 9 is an exploded perspective view of the mounting table and gasket of a conventional high-frequency heating device; FIG. 10 is a sectional view of the same essential part, and FIG. 11 is a sectional view of another conventional example. 1...Placement stand, 2...Gasket, 3
...Adhesive, 4...Top mold, 5...
・Lower mold, 6... Heating chamber, 7... Heating chamber wall, 8... Support part, 9... Door, 1°... ... Heating chamber front wall, 11 ... Support part, 1
2... Food, 13... Magnetron,
14... Self... Antenna, 15... Motor. Name of agent: Patent attorney Toshio Nakao and 1 other person +-
-Kl Figure 1
2----cas1,7toB' 1-[1also2---res1tsuY Fig. 6 0゛-°tomo2τ 7--...! 6 (?-)-A Fig. 7 11-Shutoku C) -〇~ Fig.

Claims (4)

[Claims] (1) A heating chamber in which food is stored and cooked inside the main body;
A high-frequency generator that emits high-frequency waves into the heating chamber, a mounting table on which the food is placed, and a gasket around the mounting table, and the gasket holds the mounting table in the heating chamber by coming into pressure contact with the wall of the heating chamber. At the same time, the high-frequency heating device maintains airtightness to the lower part of the heating chamber partitioned by the mounting table, and the gasket is integrally molded around the mounting table by insert molding using liquid silicone rubber. (2) The shape of the gasket before it is installed inside the heating chamber is
The entire circumference of the upper end surface of the gasket should be at the same height, and at least 3
2. The high-frequency heating device according to claim 1, wherein the side has a shape in which a flat portion is provided on the upper end surface. (3) Gaskets around the mounting table are formed continuously around the entire circumference of the top and side surfaces of the mounting table (thickness side of the mounting table), and gaskets are provided on the back side only on the part of the heating chamber wall that supports the mounting table. A high-frequency heating device according to claim 1. (4) The thickness of the tip of the gasket in contact with the upper surface of the mounting table on the inner periphery of the gasket is 0.5 mm or less, and the difference in level at the boundary line between the mounting table and the gasket is reduced. High frequency heating device.