JPH074849A - Furnace structure of batch type baking furnace - Google Patents

Abstract

PURPOSE:To permit the contriving of remarkable saving of time and lobor necessitated for the cooling of a baking chamber while contriving the improvement of heat efficiency. CONSTITUTION:The furnace structure of a batch type baking furnace 1 is provided with a furnace body 2, consisting of an inside heat insulating layer 3, surrounding a baking chamber 21, and outside heat insulating layers 7, which are superposed on the outer surface of the inside insulating layer 3, while the outside heat insulating layers 7 are moved outwardly so as to be separated from the inside heat insulating layer 3 to expose the outer surface of the inside heat insulating layer 3 to the outside air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a batch type firing furnace,
Specifically, it relates to the furnace structure.

[0002]

2. Description of the Related Art Conventionally, when firing a ceramic molded body or the like for producing capacitors, it has been common to use a batch type firing furnace 20 having a structure as shown in FIG. ing. That is, the batch-type firing furnace 20 includes a firing chamber 21 that stores and fires an object S to be processed such as a ceramic molded body that is placed in a sagger, and a furnace body 22 that surrounds the firing chamber 21. , A hearth 23 configured to be movable up and down so as to seal the lower opening of the firing chamber 21 by the rising operation. Then, the object S to be processed in this batch type firing furnace 20 is placed on the hearth 23 and stored in the firing chamber 21, and then taken out from the firing chamber 21 as the hearth 23 descends. Has become.

Here, each of the furnace body 22 and the hearth 23 is constituted by stacking a plurality of heat insulating layers made of a heat insulating material having a predetermined thickness, and inside the firing chamber 21 surrounded by these heat insulating layers. A heater 24 for heating the object S to be processed and a supply pipe and a discharge pipe (not shown) for the atmospheric gas are arranged in the chamber. At this time, the hearth 23 is moved up and down by using a so-called table lifter, which is an up-and-down drive device installed so as to support it.

[0004]

By the way, in the batch type firing furnace 20 having the above-mentioned conventional structure, in order to reduce the heat radiation loss from the furnace body 22 and increase the thermal efficiency,
The thickness of each of the heat insulating layers constituting the is increased. However, when the heat insulation is strengthened in this way, the heat storage amount in the furnace body 22 increases, and as a result, the baking chamber 2 after the baking of the object S to be processed is completed.
It takes a lot of time to cool No. 1.

That is, after the firing, the cooling gas such as air is fed into the firing chamber 21 using the atmospheric gas supply pipe and the cooling gas heated by heat exchange is discharged from the atmospheric gas discharge pipe. Firing chamber 2 while discharging
However, since the cooling gas can contact only the inner surface of the heat-insulating layer located at the innermost side of the furnace body 22, sufficient heat exchange between the cooling gas and the furnace body 22 cannot be achieved. It takes a lot of time until the heating is performed, and the baking chamber 21 cannot be rapidly cooled.

The present invention was devised in view of such inconvenience, and is a batch type in which the time and labor required for cooling the firing chamber can be significantly reduced while improving the thermal efficiency. It is intended to provide a furnace body structure of a firing furnace.

[0007]

In order to achieve such an object, a furnace body structure of a batch type firing furnace according to the present invention has an inner heat insulating layer surrounding a firing chamber and an outer heat insulating layer superposed on the outer surface thereof. It is characterized in that the outer heat insulating layer moves outwardly away from the inner heat insulating layer to expose the outer surface of the inner heat insulating layer to the outside air.

[0008]

According to the above construction, when cooling the firing chamber,
When the outer heat insulating layers that make up the furnace body are moved outward, the outer surfaces of the inner heat insulating layers that have left away from these outer heat insulating layers are exposed to the outside air, and these inner heat insulating layers have a large heat capacity. As a result of being directly cooled by, the firing chamber is quickly radiated and cooled through the thin inner heat insulating layer.

[0009]

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

FIG. 1 is a sectional view showing a simplified furnace body structure of a batch type firing furnace according to this embodiment, FIG. 2 is a sectional view showing a furnace body structure during cooling, and FIG. 3 is a batch type furnace according to a modification. It is sectional drawing which shows the furnace body structure at the time of cooling of a baking furnace, and the code | symbol 1 in these figures is a batch type baking furnace. 1 to 3, parts and portions which are the same as or correspond to those of FIG. 4 showing a conventional example are denoted by the same reference numerals, and detailed description thereof will be omitted.

This batch type firing furnace 1 has a firing chamber 21 for firing the stored object S at a high temperature of about 1300 ° C.
And a furnace body 2 surrounding the firing chamber 21,
Hearth 23 that moves up and down while supporting the placed workpiece S
It has and. Then, each of the ceiling portion and the side wall portion of the furnace body 2 in the batch type firing furnace 1 is made of a plurality of heat insulating materials having a predetermined thickness (about 20 mm) (4 in the figure).
Layer) heat insulating layers 3 to 6, that is, the inner heat insulating layer 3 that is located closest to the firing chamber 21 and surrounds the firing chamber 21, and a plurality (3 layers in the figure) of heat insulating layers 4 to 6 are integrally laminated. In addition, the outer heat insulating layer 7 is laminated on the outer surface of the inner heat insulating layer 3.

At this time, the outer surface of the inner heat-insulating layer 3 and the outer heat-insulating layer 7 which respectively constitute the ceiling portion and the side wall portion of the furnace body 2.
Is connected to the inner surface of the outer via a flexible string 8 such as a heat-resistant ceramic chain, and the outer surface of the outer heat insulating layer 7 constituting the ceiling is connected via a string 9 such as a rope. After that, it is connected to the lifting drive mechanism 10 including a horizontal motion cylinder and an electric motor. In addition,
These string-like bodies 8 and 9 are attached so as to connect the four corners of the inner and outer heat insulating layers 3 and 7, respectively.

Further, the outer surface of the outer heat insulating layer 7 constituting the side wall portion of the furnace body 2 is connected to a slide drive mechanism 11 constructed by using a horizontal moving cylinder or the like, and these outer heat insulating layer 7 is heat insulated inside. It is adapted to move outward along a pair of guide bars 12 positioned and fixed to the upper two positions of the layer 3. Reference numeral 13 in the drawing is a guide rail that is horizontally arranged in parallel to support the lower end of the outer heat insulating layer 7.
A sliding plate (not shown) is attached to the lower end of the outer heat insulating layer 7 that moves while sliding on the top. Also,
At this time, it is possible to configure the slide drive mechanism 11 by using a belt conveyor without using a horizontal motion cylinder. In such a case, the slide drive mechanism is arranged at the location of the guide rail 13. 11
The outer heat insulating layer 7 forming the side wall portion may be placed on the slide drive mechanism 11. Of course, each of the lifting drive mechanism 10 and the slide drive mechanism 11 is supported by a building ceiling or a wall (not shown) located around the batch type firing furnace 1.

Therefore, when the lifting drive mechanism 10 is operated after adopting such a structure, the outer heat insulating layer 7 forming the ceiling portion of the furnace body 2 is replaced by the inner heat insulating layer 3 as shown in FIG. The outer heat insulating layer 7 constituting the side wall of the furnace body 2 is also lifted when the slide drive mechanism 11 is operated, while being lifted outward to a position commensurate with the length of the string-like body 8. After being separated from the inner heat insulating layer 3, it is pulled outward to a position corresponding to the length of the string-shaped body 8. When the hoisting drive mechanism 10 is reversely operated, the outer heat insulating layer 7 forming the ceiling portion is put back on the outer surface of the inner heat insulating layer 3 and the slide drive mechanism 11 is reversely operated. In this case, the outer heat insulating layer 7 forming the side wall portion is moved toward the inner heat insulating layer 3 and then stacked.

Then, the baking of the object S to be processed by using the batch type baking furnace 1 is performed in a state where the baking chamber 21 is surrounded by the furnace body 2 in which the inner heat insulating layer 3 and the outer heat insulating layer 7 remain overlapped with each other. The cooling of the baking chamber 21 after the baking of the object S to be processed is performed in a state in which the outer heat insulating layer 7 forming the furnace body 2 moves away from the inner heat insulating layer 3 to the outside. That is, the firing chamber 2 of this batch type firing furnace 1
When each of the outer heat insulating layers 7 constituting the furnace body 2 is moved outward when cooling the outer heat insulating layer 1,
The outer surface of the inner heat insulating layer 3 that has left away is directly exposed to the outside air. Therefore, these thin inner heat insulating layers 3
The firing chamber 21 surrounded by only the heat exchange with the outside air through the inner heat insulating layer 3, and the firing chamber 21 is quickly radiated and cooled.

By the way, in this embodiment, a plurality of (3 in the figure) heat insulating layers 4 to 6 are integrally bonded to each other as the outer heat insulating layer 7 constituting the ceiling portion and the side wall portion of the furnace body 2. However, the heat insulating layers 4 to 6 stacked to form the outer heat insulating layer 7 may be moved separately, and in such a case, the cooling rate in the firing chamber 21 can be further increased. It is considered. That is, in the case of adopting such a configuration, as shown in the modified example of FIG. 3, each of the heat insulating layers 4 to 6 forming each of the ceiling portion and the side wall portion of the furnace body 2 is bendable such as a ceramic chain. The lifting drive mechanism 1 is connected to the outer surface of the outermost heat-insulating layer 6 while being connected by the string-shaped body 14.
0 and the slide drive mechanism 11 are connected.

That is, when such a structure is adopted, the lifting drive mechanism 10 and the slide drive mechanism 1
When each of 1 is operated, the heat insulating layer 6 located at the outermost side of the furnace body 2 to the heat insulating layer 4 located at the inner side of the furnace body 2 are sequentially moved outward, and each of these is moved to the cord-shaped body 14. As a result of being pulled out to a position corresponding to the length, the outer surface of the inner heat insulating layer 3 that surrounds the firing chamber 21 is directly exposed to the outside air. In this configuration, by sequentially controlling the driving of the lifting drive mechanism 10 and the slide drive mechanism 11 while measuring the temperatures of the heat insulation layers 3 to 6, the outward movement of each of the heat insulation layers 4 to 6 is automatically performed. It is also possible to let it be done.

According to experiments conducted by the inventor of the present invention, when cooling is performed with the inner heat insulating layer 3 constituting the furnace body 2 exposed, the initial temperature is 1300 ° C.
It was confirmed that the time required for the temperature in the baking chamber 21 to drop to 110 ° C. was about 180 minutes, which can be greatly shortened compared to about 360 minutes required in the conventional example. There is.

In this embodiment, the batch type firing furnace 1 is provided with the hearth 23 that supports the object S to be lifted and lowered, but the scope of application of the present invention is limited to the above configuration. However, although not shown, for example, the present invention can be applied to a sideways opening type batch-type firing furnace that does not include a furnace floor 23 that moves up and down and has a so-called front door. Further, when the object S to be processed by using the batch-type baking furnace 1 described above requires an atmosphere control, although not shown, the object to be processed stored in the baking chamber 21 is processed. It goes without saying that the object S is covered with a muffle made of a heat-resistant alloy or ceramic, and the treatment is performed while supplying a required atmosphere gas into the muffle.

[0020]

As described above, in the firing of an object to be processed using the batch type firing furnace according to the present invention, the firing chamber is surrounded by the furnace body in which the inner heat insulating layer and the outer heat insulating layer remain overlapped with each other. The cooling of the firing chamber is performed in a state in which the outer heat insulating layer forming the furnace body is separated from the inner heat insulating layer and moved outward. That is, in cooling the firing chamber of this batch type firing furnace, if the outer heat insulating layer is moved outward, the outer surface of the inner heat insulating layer is exposed to the outside air and is directly cooled, The firing chamber is quickly radiated and cooled through the inner heat insulating layer. Therefore, according to the furnace body structure of the batch type firing furnace according to the present invention, it is possible to obtain an effect that it is possible to significantly reduce the time and labor required for cooling the firing chamber while improving the thermal efficiency.

[Brief description of drawings]

FIG. 1 is a sectional view showing a simplified furnace body structure of a batch type firing furnace according to an embodiment.

FIG. 2 is a cross-sectional view showing a furnace body structure during cooling.

FIG. 3 is a cross-sectional view showing a furnace body structure during cooling of a batch type firing furnace according to a modification.

FIG. 4 is a sectional view showing a simplified furnace body structure of a batch type firing furnace according to a conventional example.

[Explanation of symbols]

 1 Batch type firing furnace 2 Furnace body 3 Inner heat insulating layer 7 Outer heat insulating layer 21 Firing chamber

Claims (2)

[Claims] 1. A furnace body (2) comprising an inner heat-insulating layer (3) surrounding a firing chamber (21) and an outer heat-insulating layer (7) superposed on the outer surface of the furnace body (2). 7) A furnace body structure of a batch type firing furnace, characterized in that it moves outwardly away from the inner heat insulating layer (3) to expose the outer surface of the inner heat insulating layer (3) to the outside air. 2. The outer heat insulating layer (7) comprises a plurality of heat insulating layers (4 to 4).
6. The batch-type firing furnace according to claim 1, wherein the heat-insulating layer (6) located on the outer side and the heat-insulating layer (4) located on the inner side are outwardly moved. Furnace structure.