JP3309495B2 - Batch type firing furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a batch type baking furnace, and more particularly to a batch type baking furnace having a structure in which the internal volume of a baking chamber can be changed in accordance with the amount of an object to be processed.

[0002]

2. Description of the Related Art When sintering a ceramic product or the like, the ceramic product to be processed is stored in a ceramic sagger and then heated. It is common to use a firing furnace. That is, as shown in FIG. 3, the batch-type firing furnace 20 stores a ceramic product (not shown) and heats the stacked saggers S to fire the ceramic product. 21
A furnace body 22 composed of a combination of heat insulating materials and surrounding the firing chamber 21; and a hearth 23 for closing the lower opening of the furnace body 22 by storing the sagger S in the firing chamber 21 by the ascending operation. It has.

[0003] The hearth 23 is constructed using a cylinder or the like, and is installed on a lifting / lowering device (not shown) called a table lifter or the like.
A rod-shaped electric heater 24 made of SiC (silicon carbide) or the like is provided in a suspended state in the firing chamber 21. These electric heaters 24 are controlled in temperature while the firing chamber 21 is being heated. Is to be heated.

[0004]

The internal volume of the sintering chamber 21 in the batch type sintering furnace 20 having the conventional structure described above is somewhat smaller than the number of the saggers S placed, that is, the amount of the object to be processed. Regardless, the size is usually fixed from the beginning as a size that can correspond to the maximum processing amount.
Therefore, even when the amount of the object to be processed is small, as in the case where the amount of processing is large, the entire inside of the firing chamber 21 must be heated to a predetermined temperature by the electric heater 24, and extra time is required for raising and lowering the temperature. And wasteful power is consumed. Further, in the assembly work of the batch type firing furnace 20, there is a problem that the skill is required to attach the heat insulating material and the electric heater 24 constituting the furnace body 22, and it is often troublesome to accurately assemble them. .

The present invention has been made in view of these inconveniences, and aims to reduce the time required for heating and cooling when the amount of the object to be treated is small, to reduce the power consumption, and to reduce the assembly work. It is an object of the present invention to provide a batch-type sintering furnace capable of realizing simplification.

[0006]

In order to achieve the above object, a batch-type firing furnace according to the present invention is provided with a furnace body surrounding a rectangular firing chamber whose top and bottom surfaces are open and which is open in a plan view. A furnace floor that closes a lower opening of the furnace body, a furnace lid that closes an upper opening of the furnace body, and a plate-shaped heat-insulating partition wall that divides the firing chamber in a long side direction thereof. On the inner surface of each of the side walls of the furnace body that oppose each other in the short side direction, they are arranged in parallel along the long side direction while facing each other across the firing chamber, and after being arbitrarily selected, the heat insulating partition walls An electric heater is integrally provided on the surface of the heat-insulating partition wall, while a vertical concave groove into which the side portion is inserted is formed. At this time, it is preferable to form a horizontal groove on the inner surface of the hearth in which the lower end of the heat insulating partition wall is inserted so as to match with the vertical groove formed in each of the side wall portions.

[0007]

According to the above construction, when a pair of vertical grooves formed on the side wall of the furnace body and facing each other are arbitrarily selected, and a heat insulating partition wall is inserted between these vertical grooves, The inserted heat insulating partition walls divide the inside of the firing chamber along the long side direction, and a space between the heat insulating partition walls becomes a firing space having a predetermined internal volume. Therefore, by selecting the vertical groove into which the heat insulating partition wall is inserted in consideration of the amount of the object to be processed, a firing space having an internal volume corresponding to the amount of the object to be processed can be obtained. At this time, if a horizontal groove is also formed in the hearth, the heat insulating partition wall is inserted into the groove as well, so that the airtightness of the obtained firing space is enhanced.

[0008]

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

FIG. 1 is a partially omitted perspective view showing the entire configuration of a batch type firing furnace according to this embodiment. FIG. 2 is a perspective view showing a modification of a module heater (described later). Indicates a batch type firing furnace.

The batch type baking furnace 1 includes a furnace body 3 surrounding a baking chamber 2 having a rectangular shape in a plan view with open upper and lower surfaces, and a hearth 4 which moves upward to close a lower opening of the furnace body 3. , Furnace body 3
And a furnace lid (not shown) for closing the upper opening of the furnace. The ceramic products (both not shown) stored in the sagger are placed on the hearth 4 and then fired in the firing chamber. 2
It can be stored inside. Each of the furnace body 3, the hearth 4, and the furnace lid is formed by combining a heat insulating material having a predetermined thickness, and the side walls 3 a, 3 b of the furnace body 3 opposed in the short side direction of the firing chamber 2. 3b are arranged in parallel on the inner surface of the furnace body 3 at a predetermined interval along the long side direction of the furnace body 3, and each of the side wall portions 3a, 3
b, a vertical groove 5 having a predetermined depth and a predetermined width over the entire height is formed at each position facing each other with the firing chamber 2 interposed therebetween. Note that the vertical gaps 5 are set at the same interval or different intervals as appropriate. Reference numeral 6 in the figure denotes a socket which is provided for each vertical groove 5 and to which a thermocouple (not shown) for measuring the temperature in the furnace is attached. And is sealed using

On the other hand, the hearth 4 is mounted on an elevating / lowering device (not shown) constituted by using a cylinder or the like and then driven up and down. On the inner surface of each of them, a horizontal groove 7 is formed which coincides with each of the vertical grooves 5 formed in the side wall portions 3a and 3b and connects these to each other. These lateral grooves 7 are formed so as to enhance the sealing of the firing space obtained when the inside of the firing chamber 2 is divided by the module heater 10 described later, and may not necessarily be formed. Things.

Further, the batch-type firing furnace 1 has a plurality of flat heat-insulating partition walls 8 which divide the inside of the firing chamber 2 in the longitudinal direction thereof, and is manufactured using a heat-insulating material having a predetermined thickness. On both surfaces of each of the heat insulating partition walls 8, electric heaters 9 made of metal or the like are provided. These heat-insulating partition walls 8 are called module heaters 10 because they have a structure in which electric heaters 9 are integrally disposed, and the terminals of each of the electric heaters 9 that are independently connected on the surface thereof are connected. Reference numeral 9a protrudes from the upper surface of the heat insulating material and is connected to a power supply (not shown) so as to be energized. Note that the module heater 10 shown in FIG.
The module heater 12, which is used for high temperature by providing the rod-shaped electric heater 11 made of (silicon carbide) or the like, has a configuration as shown in a modification of FIG.

Next, a procedure for using the batch-type firing furnace 1 according to the present embodiment will be described.

First, the side walls 3a, 3b constituting the furnace body 3
Arbitrarily select a pair of vertically-oriented grooves 5 formed in each of the modules and facing each other, and a module heater 10 including a heat insulating partition wall 8 between these vertically-shaped grooves 5
Insert. Then, the inserted module heater 1
By 0, the inside of the firing chamber 2 is divided along the long side direction, and the space between the module heaters 10 becomes a firing space having a predetermined internal volume. That is, each of the module heaters 10 here takes into consideration the processing amount of the ceramic product as an object to be processed, and the vertical groove 5 is formed so as to obtain a firing space having an arbitrary internal volume corresponding to the processing amount. It is inserted after selecting.

The sagger containing the ceramic product is placed in the firing space, and the electric heater 9 disposed on the surface of each of the module heaters 10 constituting each firing space is used. Is heated to the required temperature. At this time, if the horizontal groove 7 is also formed in the hearth 4, the lower end of the heat insulating partition wall 8 constituting the module heater 10 is inserted into this as well. The airtightness in each of the firing spaces obtained by inserting these module heaters 10 is enhanced.

[0016]

As described above, according to the batch-type sintering furnace of the present invention, the interior of the sintering chamber is inserted by inserting the heat-insulating partition wall into the vertical groove formed in the side wall of the furnace body. After being divided along the long side direction, it can be configured as a firing space having a predetermined internal volume. Therefore, if the insertion position of the heat insulating partition wall is selected in consideration of the amount of the object to be processed, it is possible to arbitrarily obtain a firing space having an internal volume corresponding to the amount of the object to be processed. As a result, when the amount of the object to be processed is small, it is possible to shorten the time for raising and lowering the temperature and to reduce the power consumption.

Also, in the assembly operation of the batch-type firing furnace, it is not necessary to install the heat insulating material and the electric heater as in the conventional example, so that the time and effort required for the installation are eliminated. The effect that simplification can be achieved is obtained.

[Brief description of the drawings]

FIG. 1 is a partially omitted perspective view showing the entire configuration of a batch-type firing furnace according to an embodiment.

FIG. 2 is a perspective view showing a modification of the module heater.

FIG. 3 is a cross-sectional view showing the overall configuration of a conventional batch-type firing furnace.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Batch-type baking furnace 2 Baking room 3 Furnace body 3a Side wall part 3b Side wall part 4 Hearth 5 Vertical groove 8 Heat insulation partition wall 9 Electric heater 10 Module heater

Claims (2)

(57) [Claims] 1. A furnace body (3) surrounding a baking chamber (2) having a rectangular shape in a plan view with upper and lower surfaces opened, and a hearth (4) for ascending to close a lower opening of the furnace body (3). ) And the furnace body (3)
And a flat heat-insulating partition (8) that divides the inside of the firing chamber (2) in the direction of the long side thereof, and confronts in the short side direction of the firing chamber (2). On the inner surface of each of the side walls (3a, 3b) of the furnace body (3) to be fired, they are arranged in parallel along the long side direction while facing each other with the firing chamber (2) interposed therebetween. Forming a vertical groove (5) into which the side of the heat insulating partition (8) is inserted, and an electric heater (9) disposed on the surface of the heat insulating partition (8). And a batch type firing furnace. 2. A side wall (3) is provided on the inner surface of the hearth (4).
a, 3b) forming a lateral groove (7) into which the lower end of the heat insulating partition wall (8) is inserted in conformity with the vertical groove (5) formed in each of them. 1
The batch type firing furnace as described.