JPH11294962A - Structure of furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a furnace body that can quickly raise temperature due to a sufficient insulation property, stably maintains a high-temperature state, and at the same time has sufficient strength and compact design even when adopting ceramic fiber formed on a peripheral wall with relatively low density. SOLUTION: In the structure of a furnace that introduces flame from a pilot burner for setting the inside of a furnace body to a high-temperature state, double-structure furnace wall members 4 (4A and 4B) and furnace lid members 6 (6A and 6B) are composed by a thin-plate-shaped lightweight fireproof material where ceramic fiber is formed. A reinforcing member 5B where a metal material with a narrow diameter is assembled in a net shape is provided between the double-structure furnace wall member 4 and the furnace lid member 6, at the same time, radiant heat reflection member 5A formed as a thin leaf body consisting of the metal material is provided between the double-structure furnace wall member 4 and the furnace lid member 6 and at the same time inside the furnace body of the reinforcing member 5B. Then, a ceramic fireproof curing agent 7 consisting of the ceramic fiber formed in a cotton shape is made on the inner surface of the furnace body at least in the double-structure furnace wall member 4 and the furnace lid member 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a furnace mainly used for firing ceramics and the like and melting metals.

[0002]

2. Description of the Related Art A general furnace structure employs a firebrick or the like on a peripheral wall constituting a furnace body such as a firing furnace or a melting furnace. In the case of firing ceramics, the inside of the furnace is 750 ° C.
(Unbaked) to 1250 ° C (final baking).
In order to stably maintain such a high temperature inside the furnace, a sufficient heat gradient is obtained inside and outside the furnace by thickening the furnace wall, and sufficient heat insulation with the outside is secured.

However, the surrounding wall made of a refractory brick requires a refractory brick (peripheral wall) of a considerable thickness in order to secure the above-mentioned heat insulating property at a high temperature, so that the furnace itself has a large-scale structure. Further, since the thickness of the refractory brick (peripheral wall) is proportional to the volume in the furnace, the larger the size of the object to be fired or melted, the larger the furnace itself.

[0004] In addition, since the peripheral wall made of the refractory brick has a large heat capacity and a large amount of heat radiation to the outside of the peripheral wall, it takes a considerable time to raise the temperature in the furnace to the above temperature and maintain the high temperature. Energy costs are required.

[0005] In response to such a problem, the inventor of the present application has proposed an assembling type firing furnace in which the peripheral wall of the furnace body has a double structure inside and outside the furnace, and a gap is provided therebetween. Further, in the structure of this furnace, a lightweight refractory material made of ceramic fiber having a required shape and thickness by compression or the like is used as a peripheral wall.

[0006] In this assembling type firing furnace, the temperature inside the furnace can be efficiently increased due to the excellent heat insulating property and the small heat capacity of the material of the peripheral wall. In addition, sufficient heat insulation can be ensured by the ejector effect formed by the double-structured voids.

[0007]

However, in the above-described conventional furnace structure, a gap is provided between the peripheral walls of the double structure, so that the assembly is not easy and sufficient strength as the peripheral wall is obtained. There was a problem that it was not possible.

[0008] Further, since the molded body of ceramic fiber has a lower density than that of refractory bricks and the like, and has relatively good gas permeability, even if it is attempted to ensure heat insulation by voids, the effect cannot be exhibited.

When the temperature inside the furnace becomes high and the inside wall of the furnace becomes incandescent, the radiant heat raises the temperature of the outside wall of the furnace, resulting in a large loss of thermal energy.

However, if the density or thickness of the compact is increased, the heat capacity is increased, and the furnace body is rapidly heated with a small amount of heat energy, which is contrary to the original purpose of maintaining the high temperature state. It will be.

In order to solve the above-mentioned problems, the present invention exhibits sufficient heat insulating properties even if the peripheral wall is made of ceramic fibers formed in a relatively low density state, and enables rapid temperature rise. Therefore, it is an object of the present invention to provide a compact design furnace structure that can stably maintain a high temperature state, has sufficiently high thermal efficiency, and has sufficient strength.

[0012]

In order to achieve the above object, a furnace according to the present invention has a structure in which a flame is introduced from an open flame and the inside of the furnace is heated to a high temperature state. A furnace wall member and a furnace lid member forming a peripheral wall of the furnace body, and a metal member having a small diameter in a net-like form, the furnace wall member and the furnace lid member having the double structure, And a reinforcing member disposed between each of the above to form a desired gap.

A radiant heat reflecting member formed as a thin leaf made of a metal material and disposed between the furnace wall member and the furnace lid member having the double structure and disposed inside the furnace body of the reinforcing member is provided. It is characterized by having.

Further, the reinforcing member and the radiant heat reflecting member constitute one layer of a heat insulating member, and the heat insulating member is disposed in a multilayer structure between the furnace wall member and the furnace lid member of the double structure. It is characterized by:

Further, at least the furnace wall surface of the furnace wall member and the furnace cover member is coated with a ceramic refractory material made of cotton-shaped ceramic fibers.

[0016]

Embodiments of the present invention will be specifically described below with reference to the drawings. In the present embodiment, a firing furnace for pottery or the like is taken as an example.

As shown in FIGS. 1 to 3, the firing furnace according to this embodiment has a furnace base 1, a crater member 2, a hearth member 3, a furnace wall member 4, a furnace lid member 6, an airtight member, And a refractory member 7.

First, a furnace base 1, a crater member 2, a hearth member 3
Are each formed as a substantially rectangular plate. And the furnace base 1, the crater member 2,
The hearth members 3 are stacked in this order. Among them, crater member 2
The hearth member 3 has substantially the same rectangular shape, and only the furnace base 1 is formed so that one side protrudes toward one side.

The crater member 2 has a substantially central portion on one side corresponding to the protruding portion of the furnace base 1 cut out so as to open between the furnace base 1 and the hearth member 3, and is generally viewed in plan. It has a concave shape. (Alternatively, as shown in FIG. 2, the crater member 2 may be divided so as to form a substantially concave shape in plan view by combining the crater member 2.) The opening between them forms a nozzle insertion port 2A into which the burner nozzle 10 can be inserted later.

The hearth member 3 has a flame inlet 3A vertically penetrated at a substantially central portion thereof so as to communicate with the nozzle insertion port 2A of the crater member 2. A concave step 3B is formed on the upper side of the peripheral edge of the hearth member 3.

The furnace base 1, crater member 2, hearth member 3
Is preferably made of a thin, lightweight refractory material obtained by molding ceramic fibers by means such as compression molding. In this embodiment, the thickness of the lightweight refractory material is 15 mm to 35 mm, and preferably about 25 mm.

Next, the furnace wall member 4 has a double structure in which an outer wall member 4A and an inner wall member 4B, which are mainly rectangular plates, are integrally formed. These outer wall member 4A and inner wall member 4B
Is made of a thin, lightweight refractory material formed by compressing ceramic fibers by means such as compression molding, and has a thickness of 15 mm to 35 mm, preferably about 25 mm in the present embodiment.

Further, between the outer wall member 4A and the inner wall member 4B, a heat insulating member 5 composed of a radiant heat reflecting member 5A and a reinforcing member 5B is provided. The radiant heat reflecting member 5A is formed as a thin leaf made of a refractory metal material having a low thermal conductivity, and in this embodiment, a thin leaf made of an aluminum alloy is employed. The reinforcing member 5B
It is formed by a plurality of small-diameter rods mainly made of a metal material intersecting in a net shape. Like the radiant heat reflecting member 5A, the metal material forming the reinforcing member 5B has a low thermal conductivity and is fire-resistant, and is preferably an aluminum alloy.

In the heat insulating member 5, the radiant heat reflecting member 5A is arranged along the entire outer surface of the inner wall member 4B between the outer wall member 4A and the inner wall member 4B, and the reinforcing member 5B is provided on the entire inner surface of the outer wall member 4A. It is arranged along. therefore,
The furnace wall member 4 has a laminated structure in which the inner wall member 4B, the radiant heat reflecting member 5A, the reinforcing member 5B, and the outer wall member 4A are arranged in this order from the inside of the furnace body. Further, a gap 11 is provided between the radiant heat reflecting member 5A and the outer wall member 4A due to the mesh structure of the reinforcing member 5B.

The furnace wall member 4 is erected on the outer periphery of the hearth member 3 so as to be positioned by the step 3B of the hearth member 3 as shown in FIGS. Furnace). At this time, four furnace wall members 4 are prepared so as to surround the four sides on the peripheral side of the firing furnace, and each is disposed with the inner wall member 4B facing the inside of the firing furnace. In this embodiment, the furnace wall members 4 are connected (outer wall member 4A) and anchored (inner wall member 4B) so as to have the same size and shape, respectively, for the convenience of forming and assembling the firing furnace. A configuration is employed.

Next, similarly to the furnace wall member 4, the furnace cover member 6 has a double structure in which an outer cover member 6A and an inner cover member 6B which are mainly rectangular plates are integrally formed. I have. The outer lid member 6A and the inner lid member 6B are made of a thin lightweight refractory material formed by compressing ceramic fibers by means such as compression molding, and have a thickness of 15 mm to 35 mm, preferably about 25 mm in the present embodiment. Have been.

Further, between the outer lid member 6A and the inner lid member 6B, as shown in FIG. 4, a heat insulating member 5 composed of a radiant heat reflecting member 5A and a reinforcing member 5B similar to the furnace wall member 4 is disposed. Have been.

The heat insulating member 5 has a radiant heat reflecting member 5A disposed between the outer lid member 6A and the inner lid member 6B so as to extend along the entire outer surface of the inner lid member 6B. It is arranged along the entire inner surface of 6A. Therefore, the furnace lid member 6 includes the inner lid member 6B and the radiant heat reflecting member 5.
A, a reinforcing member 5B, and an outer lid member 6A are laminated in this order. Further, a gap 11 is provided between the radiant heat reflecting member 5A and the outer lid member 6A due to the mesh structure of the reinforcing member 5B.

An exhaust port 6C vertically penetrated is provided at a substantially central portion of the furnace cover member 6.

The furnace lid member 6 is disposed with the inner lid member 6B facing the inside of the firing furnace so as to close the upper opening formed by the furnace wall member 4 assembled to the hearth member 3. You. In this case, the furnace lid member 6 is formed so as to fit into an upper opening formed by the inner wall member 4B of the furnace wall member 4 in which the inner lid member 6B is assembled, and the outer wall member 4A in which the outer lid member 6A is assembled and the inner wall member 4B is formed to cover the upper opening.

In addition, on the outer lid member 6A side of the furnace lid member 6,
A chimney member 8 communicating with the exhaust port 6C is provided. The chimney member 8 includes four plate members 8A surrounding the exhaust port 6C.
And a canopy 8C having an exhaust hole 8B. And, as with the furnace wall member 4, the plate member 8 </ b> A also employs an assembled structure.

Next, the airtight refractory material 7 includes the furnace wall member 4 (inner wall member 4B) and the furnace lid member 6 assembled as described above.
(Inner cover member 6B) is disposed on the inner surface of the furnace of the firing furnace. The hermetic refractory 7 is a cotton-like ceramic refractory which is impregnated or applied so as to increase the density inside the furnace of the firing furnace. This ceramic refractory, for example,
Usually, ceramics having a composition of silica, alumina, iron oxide or the like, which is generally used as a high-temperature heat-resistant material, are used as main raw materials, and other examples include coatings and cements. In addition, the airtight refractory material 7 may be disposed on the furnace inner surface of the hearth member 3.

When porcelain or the like is fired in such a sintering furnace, an object T such as porcelain is placed in the furnace of the sintering furnace via a shelf plate 13 arranged without closing the flame inlet 3A. Then, the burner nozzle 10 of the gas burner may be inserted from the gas cylinder 9 into the nozzle insertion port 2A, and the flame may be led into the furnace through the flame inlet 3A.

Then, the temperature inside the furnace is increased by the guided flame. When the temperature rises to a certain extent, the thermal energy tends to escape from the inner wall member 4B and the inner lid member 6B via the hermetic refractory material 7. However, since the radiant heat reflecting member 5A forming a part of the heat insulating member 5 is disposed on the outer surfaces of the inner wall member 4B and the inner lid member 6B, heat conduction is reduced to insulate. Further, since the radiant heat reflecting member 5A is formed of a metal material, the radiant heat reflecting member 5A reflects radiant heat when the inside of the furnace is incandescent.

Further, outside the radiant heat reflecting member 5A,
A net-like reinforcing member 5 forming a part of the heat insulating member 5 is provided, and the outer wall member 4A is provided outside the furnace body of the radiant heat reflecting member 5A.
A gap 11 is appropriately formed between the (outer lid member 6A) and the inner wall member 4B (inner lid member 6B). Therefore, this gap 11
With this structure, heat insulation is ensured.

The mesh of the reinforcing member 5 not only forms the gap 11, but also eliminates the contact between the radiant heat reflecting member 5A, the outer wall member 4A and the outer lid member 6A. Therefore, from the radiant heat reflecting member 5A to the outer wall member 4A and the outer lid member 6A
The transfer of thermal energy by direct contact with the
Prevents reduction of thermal energy in the furnace.

Further, the use of the heat insulating member 5 significantly improves the heat insulating property, so that the temperature inside the furnace rapidly rises. For this reason, thermal expansion occurs due to a rapid change in temperature. However, the hermetic refractory material 7 disposed on the inner surface of the furnace of the firing furnace remains in a molded state of ceramic fibers and is formed in a cotton-like shape. And has sufficient elasticity to avoid thermal damage such as cracks in each part.

As described above, the heat insulating member 5 prevents the escape of heat energy by the radiant heat reflecting member 5A and reflects the radiant heat to further improve the heat insulating property.
B is used to obtain a space 11 having heat insulation properties as appropriate,
Since the heat transfer is reduced by preventing direct contact from the radiant heat reflecting member 5A to the outside of the furnace, even if the firing furnace is made of ceramic fibers molded in a relatively low-density state, it is sufficient. By exhibiting heat insulation properties, it is possible to rapidly raise the temperature and maintain a stable high temperature state, and obtain a required high temperature (usually 1250 ° C. for firing ceramics).

Further, since the reinforcing member 5B of the heat insulating member 5 is arranged along the entire surface of the furnace wall member 4 and the furnace lid member 6 having the double structure, the above-described space 11 is obtained by the mesh structure. In addition, the strength of the furnace wall member 4 and the furnace lid member 6 can be increased. Therefore, it is possible to reduce the thickness of the configuration forming each wall of the firing furnace, and it is possible to realize a firing furnace of a compact design having sufficient strength.

Further, since the cotton-like airtight refractory material 7 disposed on the inner surface of the furnace of the firing furnace has a sufficient elasticity in response to a rapid temperature rise in the furnace, a rapid temperature change occurs. Even if there is thermal expansion due to thermal expansion, thermal damage such as cracks in each part can be avoided.

In the above-described embodiment, the heat insulating member 5 composed of the radiant heat reflecting member 5A and the reinforcing member 5B is provided between the furnace wall member 4 and the furnace lid member 6 having the double structure.
However, only the reinforcing member 5B is provided between the furnace wall member 4 and the furnace lid member 6 so that the gap 11 is communicated between the furnace wall member 4 and the furnace lid member 6. It is possible. According to this, since the gap 11 can be obtained easily and with high strength, the conventional ejector effect can be obtained with a simpler configuration.

If the heat insulating member 5 composed of the radiant heat reflecting member 5A and the reinforcing member 5B described above is laminated in multiple layers between the furnace wall member 4 and the furnace lid member 6, the above heat insulating / heating effect can be obtained. Can be doubled.

Further, in this embodiment, the furnace body having a double structure constituted by the plate-shaped furnace wall member 4 and the furnace lid member 6 is constituted. Needless to say, a furnace body having a structure may be formed.

[0044]

As described above, the present invention relates to a furnace structure in which a flame is introduced from an open flame and the inside of the furnace is heated to a high temperature state. A furnace wall member and a furnace lid member forming a peripheral wall of the furnace body, and a metal member of a small diameter assembled in a net-like shape and disposed between each of the furnace wall member and the furnace lid member having a double structure and a desired gap. And a reinforcing member. This allows
It is possible to exhibit a structural heat insulating effect by the void.

Further, according to the mesh reinforcing member, a gap for reducing the air density to the vacuum side by the ejector effect when the air is exhausted from the furnace body can be obtained easily and with high strength.

Further, a radiant heat reflecting member is provided between the furnace wall member and the furnace lid member having a double structure, which is formed as a thin sheet made of a metal material, and is disposed inside the furnace body of the reinforcing member. By doing so, while preventing escape of thermal energy to the voids formed by the reinforcing members, and reflecting the radiant heat when the furnace body is incandescent, exhibits sufficient heat insulation,
Rapid temperature rise is possible, and a high temperature state can be stably maintained.

Further, in the configuration provided with both the reinforcing member and the radiant heat reflecting member, the reinforcing member has a net-like structure, so that the radiant heat reflecting member and the double-walled furnace wall member and the outside of the furnace body of the furnace lid member are provided. Losing contact. Therefore, transmission of thermal energy from the radiant heat reflecting member due to direct contact between the furnace wall member and the furnace lid member of the double structure to the outside of the furnace body can be eliminated, and a decrease in heat energy in the furnace body can be prevented.

As described above, the radiant heat reflecting member and the reinforcing member disposed between the furnace wall member and the furnace lid member having the double structure improve the heat insulation inside the furnace and improve the strength of the furnace body. The thickness of the structure forming the peripheral wall of the body can be reduced, and the concept of a furnace with a compact design having sufficient strength can be realized.

Further, if the reinforcing member and the radiant heat reflecting member constitute one layer of a heat insulating member, and the heat insulating member is laminated and disposed between the furnace wall member and the furnace lid member having a double structure, Sufficient heat insulation can be obtained, and the effect of rapidly increasing the temperature and maintaining a stable high temperature state can be doubled.

Further, since at least the furnace wall surface of the furnace wall member and the furnace cover member are coated with a ceramic refractory material made of a cotton-like ceramic fiber, a sufficient refractory temperature corresponding to a rapid temperature rise in the furnace body can be obtained. Thus, even if there is a thermal expansion due to a rapid temperature change, thermal damage such as cracks can be avoided.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a furnace structure according to the present invention.

FIG. 2 is an exploded perspective view of the structure of the furnace.

FIG. 3 is a side sectional view of the structure of the furnace.

[Explanation of symbols]

4 ... furnace wall member, 4A ... outer wall member, 4B ... inner wall member, 5 ...
Heat insulation member, 5A: radiation heat reflection member, 5B: reinforcement member, 6
... furnace lid member, 6A ... outer lid member, 6B ... inner lid member, 7 ... airtight refractory member (ceramic refractory material).

Claims (4)

[Claims] 1. A furnace structure in which a flame is introduced from an igniter to bring the inside of the furnace to a high temperature state, wherein the furnace has a double-layered structure made of a thin sheet of lightweight refractory material formed of ceramic fibers and forms a peripheral wall of the furnace body. A wall member and a furnace lid member, and a reinforcing member formed by assembling a small-diameter metal material in a net shape and disposed between each of the double-walled furnace wall member and the furnace lid member to form a desired gap; Furnace structure characterized by comprising: 2. It is formed as a thin body made of a metal material,
2. The furnace according to claim 1, further comprising a radiant heat reflecting member disposed between the furnace wall member and the furnace lid member having the double structure and inside the furnace body of the reinforcing member. 3. Construction. 3. The reinforcing member and the radiant heat reflecting member constitute one layer of a heat insulating member, and the heat insulating member is disposed between the furnace wall member and the furnace lid member of the double structure in a multilayer manner. 3. The structure of the furnace according to claim 2, wherein: 4. A ceramic refractory made of cotton-shaped ceramic fibers is applied to at least the inner surface of the furnace inside the furnace wall member and the furnace lid member. The structure of the furnace according to any one of the above.