JP2007010205A - Microwave baking furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a microwave baking furnace improving adhesion of split partition and preventing direct irradiation of a backup member of low heatresistant temperature with heat. <P>SOLUTION: This microwave baking furnace 201 for baking a treated object 204 by microwave heating, comprises: a furnace main body 202 having one opened face and composed of microwave-permeable partition; and a door main body 203 having a microwave-permeable first partition openable and closable to the opened face of the furnace main body, and a microwave-permeable second partition mounted at a furnace inner side on the first partition. The second partition includes a first member and a second member split in a state of adhering by being pressed in the thickness direction of the door. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a microwave baking furnace that manufactures a fired body by firing an object to be processed formed of a ceramic material or the like by microwave heating.

  Conventionally, in a microwave firing furnace, in order not to let the heat in the furnace escape, not only the furnace body but also a door body for opening and closing the object entry / exit port of the furnace body has a partition wall using a heat insulating material. Provided.

  In particular, since the heat in the furnace from the furnace body outlet / outlet is greatly diverged, the installation accuracy is improved so that the insulation on the furnace body inlet / outlet side of the furnace body and the door body side abut against each other without any gaps. The degree of adhesion is increased by increasing packing or interposing a packing on the partition wall on the door body side.

  In addition, there is another type in which the degree of adhesion is further increased by urging the partition wall of the door body against the partition wall of the furnace body using a compression spring. In addition, the partition on the furnace body side is provided at the peripheral edge of the workpiece inlet / outlet, and the partition on the door body side is provided in a portion in contact with the partition on the furnace body side.

However, the partition walls exposed to high temperatures are shrunk, distorted, and cracked due to changes with time, and such cracks gradually expand, so that a lot of heat escapes from the gaps. Therefore, a ceramic door device formed by dividing a partition wall in advance has been proposed (see, for example, Patent Document 1). In this case, as shown in FIG. 3, a plurality of flat plate-like heat insulating material pieces 101, 102, 103 are made in advance and assembled.
JP 2001-316166 A

However, a conventional door device for a ceramic furnace has a partition wall (second partition wall) divided and cut and a partition wall (first partition wall) as a backup plate that supports the partition walls, but the second partition walls are cut. Since the surface is straight, heat may be radiated directly to the first partition through a slight gap in the cut surface. In this case, the portion of the first partition where heat is directly radiated from the furnace becomes a higher temperature than the portion where heat is transferred through the second partition, and deterioration is accelerated.
In addition, since the partition as a backup plate usually uses a member having a lower heat-resistant temperature than the partition exposed in the furnace, the portion of the first partition where heat is radiated is the second partition exposed in the furnace. Deterioration progresses quickly because it cannot withstand the same high temperature condition.

  This invention is made in view of the situation concerned, and it aims at improving the adhesiveness of the partition formed by dividing, and preventing that a heat | fever is directly radiated to the backup member with a low heat-resistant temperature.

  The microwave baking furnace of the present invention is a microwave baking furnace for baking an object to be processed by microwave heating, having a single opening surface, and a furnace main body configured with a microwave permeable partition wall; A door that is openable and closable with respect to the opening surface of the furnace body, and has a microwave permeable first partition and a microwave permeable second partition provided inside the furnace on the first partition. A main body, and the second partition includes a first member and a second member divided so as to be in close contact with each other by pressing in the door thickness direction.

  With this configuration, the first member and the second member form a cross section that includes a surface that intersects the door thickness direction, and the cross section is not parallel and linear to the door thickness direction. Most of the heat radiated linearly cannot pass through the first member and the second member constituting the second partition, and the amount of heat radiated to the first partition through the gap is Decrease.

  Moreover, the microwave baking furnace of this invention is equipped with the elastic member which urges | biases the said 1st partition toward the said furnace main body side in the state which the said door main body closed.

  By this structure, the 1st member and 2nd member which comprise a 2nd partition are pressed by the door thickness direction, and adhesiveness increases.

  ADVANTAGE OF THE INVENTION According to this invention, the adhesiveness of the partition formed by dividing can be improved, and it can prevent that a heat | fever is directly radiated to the member with low heat-resistant temperature.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments for carrying out the invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view of a furnace portion of a microwave baking furnace according to an embodiment of the present invention. In this figure, a microwave firing furnace 201 of the present embodiment is a firing furnace for ceramics that fires at a temperature of about 1300 ° C., and is generated by microwaves generated by a microwave generator (not shown) such as a magnetron. Heating is performed.

  A microwave baking furnace 201 is installed in a cavity, and is used to load and unload a furnace body 202 made of a heat insulating material formed in a box shape with one surface opened, and a workpiece 204 into and out of the furnace body 202. Door main body 203.

  For the furnace main body 202, a heat insulating material made of a material (for example, alumina fiber or foamed alumina) whose main component is a substance having a small microwave loss (microwave transmitting property) is used. The furnace body 202 and the door body 203 are in contact with each other on the surfaces of the partition walls so that heat in the furnace body 202 is not dissipated to the outside.

  Further, a step (portion indicated by reference numeral 205 in the figure) is formed at the contact portion between the furnace main body 202 and the door main body 203, and this step can prevent the heat in the furnace main body 202 from spreading out.

  FIG. 2 is an enlarged cross-sectional view of the door body 203 of FIG. In this figure, the door body 203 includes a door frame 301, a door partition presser frame 302, door partition tensioners 303 and 304, and door partition walls 305 to 308.

  The door partition 305 serves as a backup plate that supports the door partitions 306 to 308.

  Here, the door partition 305 corresponds to the first partition according to claim 1 of the claims, and the entire door partitions 306 to 308 correspond to the second partition. Each of the door partition walls 306 to 308 corresponds to a first member and a second member included in the second partition wall. Further, in the present embodiment, the second partition is formed by being divided into three parts, but the present invention is not limited to this and may be divided into any number.

  The door frame 301 and the door partition presser frame 302 are constituted by metal frames for storing the door partition walls 305 to 308 and the door partition wall tensioners 303 and 304. Stainless steel is suitable as a material for the metal frame.

  The door partition tensioners 303 and 304 are made of an elastic member that urges each of the door partition walls 305 to 308 toward the furnace body 202. By energizing each of the door partition walls 305 to 308 toward the furnace body 202, the door partition walls 306 to 308 and the furnace body 202 can be brought into close contact with each other when the door body 203 is closed. Can be kept low.

  The door bulkhead 305 (first bulkhead) is such that the door bulkhead tensioners 303 and 304 made of elastic members try to push the door bulkheads 306, 307 and 308 (second bulkhead) toward the furnace body 202 (in the direction of arrow A). It plays a role of equally transmitting the force to the door partition walls 306, 307 and 308.

  Since the door partition 305 supports the door partition tensioners 303 and 304, the force generated by the door partition tensioners 303 and 304 is evenly transmitted to the door partition 305, and from the door partition 305 to the door partitions 306, 307, and 308 evenly. When the door main body 203 is closed, it is brought into close contact with the furnace main body 202 without a gap. Thereby, the spreading | diffusion of the heat in the furnace main body 202 to the exterior can be suppressed low.

  The door partition 305 may be made of the same material as the door partitions 306 to 308, but may be made of a different material. That is, for the heat insulation, the door partition 305 does not require as much as the door partitions 306 to 308, so that a material cheaper than the material used for the door partitions 306 to 308 can be used, and the cost can be reduced.

  The door partition walls 306 to 308 are divided in the left-right direction (in the direction of arrows B and C in the drawing), and are formed as a combined configuration with steps 309 and 310 without a straight line portion from the inside of the furnace.

  By adopting such a structure in which the steps 309 and 310 are provided, it is possible to reduce the heat in the furnace from being directly radiated to the door partition wall 305. That is, most of the heat radiated and radiated linearly from the furnace cannot pass through the steps 309 and 310 and is absorbed by the door partition walls 306 to 308. Heat absorbed by the door partition walls 306 to 308 is transferred to the door partition wall 305 by heat transfer. With this configuration, the heat directly radiated from the inside of the furnace to the door partition 305 as a backup plate is reduced, so that the deterioration of the door partition 305 can be prevented from being accelerated earlier than other partitions.

  In addition, when the door partition walls 306 to 308 are somewhat shrunk, distorted, or cracked, the gap between the door partition walls is widened. Release can be prevented. Further, by dividing, even if the door partition walls 306 to 308 are somewhat contracted or distorted, the split structure has an action of absorbing the contraction and distortion and preventing the door partition walls 306 to 308 from being damaged.

  As described above, according to the microwave baking furnace according to the present embodiment, by providing a non-linear cross section such as a step in the cut surfaces of the door partition walls 306 to 308, the heat in the furnace passes through the cut surfaces. Since the door partition 305 is not reached and the door partition 305 is not directly radiated to the heat in the furnace, the door partition 305 can be prevented from being deteriorated.

  Moreover, by providing a step in the cut surfaces of the door partition walls 306 to 308, the distance in the thickness direction can be increased, and heat from the furnace in the furnace can be kept low through the cut surfaces.

  Further, the door partition walls 305 to 308 are urged toward the furnace main body 202 by the door partition tensioners 303 and 304, and the direction thereof is not parallel to the direction of the cut surface but intersects with each other. The adhesion between the surfaces is increased.

  In addition, the door partition tensioners 303 and 304 urge the door partition walls 305 to 308 toward the furnace main body, so that the adhesion between the door main body 203 and the furnace main body 202 is increased, and the door main body 203 and the furnace main body 202 The heat in the furnace from the gap can further suppress the divergence.

  In the present embodiment, the cut surfaces in the door partition walls 306 to 308 have the steps 309 and 310 as shown in FIG. 1 or FIG. 2, but the shape of the cut surfaces is not limited thereto, and is curved. It may have any shape, and any shape may be used as long as at least a part thereof does not run in parallel with the urging direction of the door partition tensioners 303 and 304.

  The present invention has an effect of improving the adhesion of partition walls formed in a divided manner and preventing heat from being directly radiated to a backup member having a low heat-resistant temperature, and to a microwave baking furnace for ceramics. Can be applied.

The cross-sectional view which shows schematic structure of the furnace part of the microwave baking furnace which concerns on one embodiment of this invention The cross-sectional view which expanded the door main body 203 of the microwave baking furnace of FIG. The figure which shows an example of the conventional partition

Explanation of symbols

201 Microwave firing furnace 202 Furnace main body 203 Door main body 204 Object to be processed 205 Stepped portion 301 Door frame 302 Door partition presser frame 303 to 304 Door partition tensioner 305 Door partition (first partition)
306-308 Door partition (second partition)
309, 310 steps

Claims (2)

A microwave baking furnace for baking an object to be processed by microwave heating,
A furnace body having one opening surface and composed of a microwave-permeable partition;
A door that is openable and closable with respect to the opening surface of the furnace body, and has a microwave permeable first partition and a microwave permeable second partition provided inside the furnace on the first partition. A main body,
The said 2nd partition is a microwave baking furnace which contains the 1st member and 2nd member which were divided | segmented so that it might contact | adhere by the press of a door thickness direction.   The microwave baking furnace according to claim 1, further comprising an elastic member that urges the first partition toward the furnace body in a state where the door body is closed.

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