JP4228060B2 - Chimney of a pottery kiln - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is provided in pottery kiln relates to a chimney for discharging the combustion gases.
[0002]
[Prior art]
Conventionally, the chimney of a ceramic pottery kiln was made only of a metal cylinder such as stainless steel. However, since the high-temperature combustion gas directly touched the metal cylinder, the metal cylinder was severely damaged and had to be replaced with a new one in a short period of time. Therefore, in recent years, as described in "Industrial Furnace Handbook" edited by the Japan Industrial Furnace Association, July 20th, 1978, pages 549 to 554, the irregular refractory is formed inside the metal cylinder. Chimneys with objects are used.
[0003]
A method for manufacturing a chimney in which an irregular refractory is placed will be described with reference to FIGS. First, a metal cylinder 31 made of a metal such as stainless steel and having a Y-shaped or L-shaped support fitting 32 protruding and welded to the inner wall 31a is formed. This metal cylinder 31 is connected to a combustion furnace, and a cylindrical mold 33 is inserted therein. Then, an amorphous refractory 34 having fire resistance and heat insulation is placed between the metal cylinder 31 and the mold 33.
[0004]
After the amorphous refractory 34 is solidified, the chimney 30 is completed by removing the mold 33. The solidified amorphous refractory is locked by the support fitting 32 and fixed to the metal cylinder 31. Even if high-temperature combustion gas passes through the chimney 30, the presence of the irregular refractory 34 prevents the combustion gas from directly contacting the metal cylinder 31, and the metal cylinder 31 is rapidly damaged. There is no exposure to the high temperatures that advancing.
[0005]
[Problems to be solved by the invention]
However, since the conventional chimney manufacturing method uses a method of placing an irregular refractory, it is necessary to wait for the amorphous refractory to be cast on site and solidify, and it takes time to produce the chimney. I need it.
It is possible to transport the finished chimney after solidifying the refractory in advance in another place and connect it to the combustion furnace on site, but the metal cylinder and the refractory in a single unit are integrated. Therefore, the chimney is heavy and requires a lot of labor for transportation.
[0006]
Moreover, since it is necessary to weld a support metal fitting in the state which protruded from the inner wall of the metal cylinder, the man-hour and cost which manufacture a metal cylinder will increase.
Moreover, since a support metal fitting is required and the mold needs to be inserted and removed, the inner diameter of the chimney that can be formed cannot be made too small, and the size of the chimney is limited.
[0007]
The present invention has been made in view of such circumstances, and realizes a long life of the chimney with a simple structure and a simple manufacturing method, can reduce the manufacturing period, and is easy to carry. The purpose is to provide a chimney for ceramic pottery .
[0008]
[Means for Solving the Problems]
The invention according to claim 1 is a cylindrical chimney that is connected to an exhaust port of a ceramic pottery and exhausts combustion gas discharged from the exhaust port to the outside, and the chimney is a metal cylinder that forms the outer wall thereof And a fire-resistant and heat-insulating cylinder inserted into the inner surface of the metal cylinder , and the fire-resistant and heat-insulating cylinder is made of a fire-resistant and heat-insulating material formed into a cylindrical shape and a fire-resistant and heat-insulating fiber. A plurality of the fire-resistant and heat-insulating cylinders, wherein the end faces of the inner-wall cylinders are encapsulated by skirts formed by bending the end portions in the axial direction of the fire-resistant heat-insulating cloths inward. The body is connected and arranged so that the skirts are in close contact with each other.
[0009]
According to a second aspect of the present invention , a plurality of chimneys are connected by forming one end of the metal cylinder larger than the other part and fitting the other end of another metal cylinder to the one end. It is characterized by being.
[0010]
The chimney according to claim 3 is characterized in that a ceramic fiber is used as a refractory heat insulating material.
[0011]
The chimney according to claim 4 is characterized in that a ceramic fiber is used as a fireproof and heat insulating fiber.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. FIG. 1 is a front view showing an example of a ceramic pottery according to the present invention. 2 is a partial cross-sectional view, FIG. 3 is an enlarged cross-sectional view of a portion II in FIG. 2, FIG. 4 is an enlarged cross-sectional view of a portion I in FIG. 1, and FIG. FIG. 6 is an explanatory view showing a method for assembling the fireproof and heat insulating cylinder according to the present invention. FIG. 7 is an explanatory view showing a method of manufacturing a chimney according to the present invention.
[0013]
1 to 8, a pottery kiln 5 is a combustion furnace 1 for baking a pottery product 5a. The pottery kiln 5 has a combustion chamber 8 formed therein with fireproof and heat insulating bricks, and the combustion chamber 8 can be freely opened and closed by a lid 7. At the bottom of the combustion chamber 8, a burner 6 that emits a flame f with gaseous fuel or liquid fuel (kerosene) is provided. The ceramics 5a is baked by the flame f by the burner 6. On the side surface of the ceramic pottery 5, there is provided a smoke exhaust passage 9 that communicates with the combustion chamber 8 and discharges the combustion gas generated in the combustion chamber 8 toward the upper side of the pottery kiln 5. An exhaust port 3 is provided at the upper end of the smoke exhaust passage 9.
[0014]
A cylindrical stack for fixing the chimney 2 and a chimney fixture 10 having an outward ridge on the bottom surface are fixed to the exhaust port 3 via a heat sealing material 11 described later. The chimney 2 for discharging the combustion gas is fixed to the exhaust port 3 by the chimney fixture 10 and extends upward .
[0015]
The chimney 2 is composed of a metal cylinder 12 having an outer wall made of stainless steel and a fireproof and heat insulating cylinder 20 having an inner wall. The chimney 2 shown in this embodiment secures a predetermined length by connecting a plurality of metal cylinders 12 having a length of about 1 m to 0.3 m and fire-resistant and heat-insulating cylinders 20 to be described later, thereby ensuring the ceiling of the house. It extends outside through w. The diameter of the metal cylinder 12 is about 160 mm. An exhaust pipe 4 having a substantially H-shaped cross section is provided at a portion of the chimney 2 that is exposed to the outside to prevent rainwater from entering the chimney 2. A space between the ceiling w and the chimney 2 is filled with a heat insulating material w1 which is a caulking material having fireproof heat insulation properties, and the heat of the chimney 2 is hardly transmitted to the ceiling w. In addition, although described about the case where the chimney 2 penetrates the ceiling w, it is the same also when penetrating a wall surface.
[0016]
Next, the manufacturing method of the fireproof heat insulation cylinder 20 which concerns on this invention is demonstrated. First, a method for assembling the fireproof and heat insulating cylinder 20 will be described. As shown in FIG. 6B, three inner wall cylinders 21 formed by solidifying ceramic fibers having fire resistance and heat insulation into a cylindrical shape having a length of about 0.3 m are arranged, and the ceramic fibers are formed into fibers. It puts on the formed fireproof insulation cloth 22. And the fireproof heat insulation cloth 22 is wound around the three inner wall cylinders 21 (arrow h direction). The wall thickness of the inner wall cylinder 21 is about 10 mm, and the thickness of the refractory heat insulating cloth 22 is about 6 mm. Further, the size of the refractory heat insulating cloth 22 is such that the skirt portion 22a of the refractory heat insulating cloth 22 protrudes from the end face 21a of the inner wall cylinder 21 as shown in FIG. Further, in this embodiment, the three inner wall cylinders 21 are wrapped with one fireproof heat insulating cloth 22, but this is not restrictive, and more inner wall cylinders 21 are wrapped according to the shape of the chimney 2. However, one inner wall cylinder 21 may be wrapped.
[0017]
Next, as shown in FIG. 6 (d), the skirt 22 a of the fireproof heat insulating cloth 22 is bent inward so as to cover the end surface 21 a of the inner wall cylinder 21. Thereby, the fireproof heat insulating cylinder 20 is completed. In addition, you may fix the fireproof heat insulation cloth 22 to the inner wall cylinder 21 with an adhesive agent. Moreover, the assembly of the fireproof and heat insulating cylinder 20 may be performed at the site where the combustion furnace 1 is installed, or may be performed at a factory or the like at another location.
[0018]
The ceramic fiber is a fiber that is particularly excellent in heat insulation and fire resistance, mainly composed of alumina (Al ₂ O ₃ ) and silica (SiO ₂ ). The temperature that can be used while maintaining the durability is about 1,300 ° C. or less, and has a performance that can sufficiently withstand the temperature of the combustion gas. Further, the fireproof and heat insulating cylinder 20 having a length of about 0.3 m using the ceramic fiber described in the present embodiment has a weight of about 250 g, and the use of the ceramic fiber makes it a very light fireproof and heat insulating cylinder. It is possible to make a body 20. Although glass fibers or aramid fibers can be used for the fire-resistant and heat-insulating cylindrical body 20 instead of ceramic fibers, their fire-resistant and heat-insulating properties are about 600 ° C. or less, and ceramic fibers are preferably used.
[0019]
Next, a method for manufacturing the chimney 2 main body will be described. First, as shown in FIG. 3, the metal cylinder 12 is fitted and fixed to the chimney fixture 10 fixed to the exhaust port 3. Next, as shown in FIG. 7, the fireproof and heat insulating cylinder 20 is pushed into the fixed metal cylinder 12. Since the fireproof heat insulating cloth 22 has elasticity, it is pushed in while being contracted, and the inside of the metal cylinder 12 is expanded in diameter, so that the metal cylinder 12 and the fireproof heat insulating cylinder 20 are stronger. In close contact, the greater rigidity of the fire-resistant and heat-insulating cylinder 20 by the metal cylinder 12 is ensured.
[0020]
The lower end of the metal cylinder 12 is larger in diameter than the other parts, and another metal cylinder 12 is attached to the upper end of the first-stage metal cylinder 12 with the fireproof and heat insulating cylinder 20 inserted as described above. Mating and connecting. Then, as in the first stage, the fire-resistant and heat-insulating cylinder 20 is inserted into the other metal cylinder 12. At this time, the bottom part 22b of the fireproof heat insulating cloth 22 positioned below and the bottom part 22a of the fireproof heat insulating cloth 22 pushed in from the top are brought into close contact with each other. By continuing to assemble the next stage, the chimney 2 is extended upward with the cross-sectional structure shown in FIG.
[0021]
As the fire-resistant and heat-insulating cylinder 20 that is inserted into the metal cylinder 12 projecting from the ceiling w to the outside, an object having a shorter length than the metal cylinder 12 is used. Then, the fire-resistant and heat-insulating cylinder 20 is inserted up to about 0.5 m above the ceiling w, and the metal cylinder 12 is the only part beyond that. By adopting such a structure, the combustion gas comes into direct contact with the metal cylinder 12 with high heat dissipation and is cooled, and the flame due to the combustion gas is less likely to be ejected from the tip of the chimney 2. In addition, since the combustion gas which reached the front-end | tip of the chimney 2 is cooled, the surface temperature of the metal cylinder 12 is about 200 degrees C or less, and the metal cylinder 12 is not damaged greatly by heat. The chimney 2 is completed by fixing the exhaust pipe 4 to the tip of the chimney 2.
[0022]
The combustion gas exiting the combustion chamber 8 (arrow a in FIG. 2) passes through the smoke exhaust passage 9 (arrow b in FIG. 2) and enters the chimney 2 through the exhaust port 3. The temperature of the combustion gas here is around 1,000 ° C. The combustion gas passes through the chimney 2 and moves upward (arrow c in FIGS. 3 and 4). The combustion gas rises and is gradually cooled. In addition, the surface temperature of the metal cylinder 12 is suppressed to about 200 ° C. or less by the heat insulating property of the fireproof heat insulating cylinder 20. That is, even with a simple structure in which the fire-resistant and heat-insulating cylinder 20 is simply inserted into the metal cylinder 12, the high-temperature combustion gas does not directly touch the metal cylinder 12, and the fire-resistance forms an inner wall. Since the metal cylinder 12 that forms the outer wall by the heat insulating cylinder 20 is not easily exposed to high temperatures, the fireproof heat insulation of the chimney 2 is ensured and the life becomes long.
[0023]
Moreover, since the surface temperature of the metal cylinder 12 is suppressed, even if the heat insulation material w1 is simply packed between the metal cylinder 12 and the ceiling w, the ceiling w is It is hard to be heated so as to ignite, and the construction of the chimney 2 can be easily performed.
[0024]
Moreover, according to the present Example, since the chimney 2 is not assembled beforehand, it is possible to convey the fireproof heat insulation cylinder 20 and the metal cylinder 12 separately, so that the labor for transportation can be reduced. it can. Even in this case, the work at the manufacturing site of the combustion furnace 1 may be performed only by inserting the fireproof and heat insulating cylinder 20 into the metal cylinder 12, and the manufacturing period can be shortened.
[0025]
Moreover, since it is possible to manufacture the metal cylinder 12 and the fire-resistant and heat-insulating cylinder 20 in separate steps, it is possible to manufacture the fire-resistant and heat-insulating cylinder 20 having a small diameter, Since it is not necessary to directly process the inner periphery of the metal cylinder 12, it is possible to use the metal cylinder 12 having a small diameter, and it is difficult to be limited by the size of the chimney diameter.
[0026]
In addition, since the fire-resistant and heat-insulating cylinder 20 is not fixed to the metal cylinder 12 with a support fitting or an adhesive, when the fire-resistant and heat-insulating cylinder 20 is damaged and replaced, the fire-resistant and heat-insulating cylinder 20 is easily fire-resistant from the metal cylinder 12. The heat insulating cylinder 20 can be extracted.
[0027]
Further, a plurality of fire-resistant and heat-insulating cylinders 20 enclosing the end face 21a of the inner wall cylinder 21 with the skirts 22a and 22b of the fire-resistant and heat-insulating cloth 22 are arranged so as to be in close contact with each other. . For this reason, when a plurality of fire-resistant and heat-insulating cylinders 20 are inserted into the metal cylinder 12, there is no gap between the fire-resistant and heat-insulating cylinders 20, and high-temperature combustion gas can directly touch the metal cylinder 12. The metal cylinder 12 is not easily damaged. In addition, as shown in FIG. 8, the heat-seal material 11 made from fireproof heat insulating materials, such as a foamable ceramic fiber, can also be pinched | interposed between the fireproof heat insulating cylinders 20 mutually .
[0028]
Further, since the ceramic fiber used in this example is excellent in chemical stability, it is also resistant to corrosion by substances such as dioxins generated when dust is burned.
[0029]
【The invention's effect】
According to invention of Claim 1 or Claim 2 , the fireproof heat insulation cylinder is inserted in the inner surface of a metal cylinder, and is contact | abutted and arrange | positioned at the inner surface of a metal cylinder. For this reason, even with a simple structure in which a fire-resistant and heat-insulating cylinder is simply inserted into a metal cylinder, high-temperature combustion gas does not directly touch the metal cylinder, and fire-resistant and heat-insulating which forms an inner wall Since the metal cylinder that forms the outer wall of the cylinder is not easily exposed to high temperatures, the fireproof and heat insulating properties of the chimney are ensured and the life is extended.
In addition, since the fire-resistant and heat-insulating cylinder is molded in advance, the work at the combustion furnace manufacturing site only needs to insert the fire-resistant and heat-insulating cylinder into the metal cylinder, thereby forming the fire-resistant and heat-insulating cylinder. It is possible to save time and shorten the manufacturing period.
Moreover, since it is not necessary to provide a support fitting in the metal cylinder or insert a mold, the inner diameter of the chimney that can be formed can be reduced.
Further, since the fire-resistant and heat-insulating cylindrical body and the metal cylindrical body that are molded in advance can be separately transported, the labor for transportation can be reduced.
In addition, since the metal cylinder and the fire-resistant and heat-insulating cylinder are in close contact with each other, even if an external force such as vibration or vibration is applied to the fire-resistant and heat-insulating cylinder, the fire-resistant and heat-insulating cylinder is supported by the support force of the metal cylinder. Body rigidity is ensured.
[0030]
In addition, the fire-resistant and heat-insulating cylinder is formed by attaching a fire-resistant and heat-insulating cloth to the inner wall cylinder, and the outer peripheral surface of the fire-resistant and heat-insulating cylinder has elasticity so that the fire-resistant and heat-insulating cylinder can be made of metal smoothly. It can be inserted into a cylinder. Also, in the interior of the metal cylinder, since the fireproof heat insulating cloth expands, the metal cylinder and the fireproof and heat insulating cylinder are more closely in contact with each other, and the fireproof and heat insulating cylinder is made by the metal cylinder. The greater rigidity is ensured.
[0031]
Further, a plurality of fire-resistant and heat-insulating cylinders enclosing the end face of the inner wall cylinder by the skirts of the refractory heat-insulating cloth are connected and arranged so that the skirts are in close contact with each other. For this reason, even when a plurality of fire-resistant and heat-insulating cylinders are inserted and arranged in a metal cylinder, there is no gap between the fire-resistant and heat-insulating cylinders, and high-temperature combustion gas can directly touch the metal cylinder. The metal cylinder is not easily damaged.
[0032]
According to the invention of claim 3 , since the ceramic fiber is used as the refractory heat insulating material, the refractory heat insulating cylinder is particularly excellent in refractory heat insulation, and the refractory heat insulating cylinder itself is exposed to a high temperature for a long time. Even if it is, it is difficult to deteriorate and has a long life.
[0033]
According to the invention of claim 4 , since the ceramic fiber is used as the fire-resistant and heat-insulating fiber, the fire-resistant and heat-insulating cylindrical body is particularly excellent in fire-resistant and heat-insulating, and the fire-resistant and heat-insulating cylinder itself is kept at a high temperature for a long time. Even if exposed, it is difficult to deteriorate and has a long life.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of a pottery kiln according to the present invention.
FIG. 2 is a partial cross-sectional view of FIG.
FIG. 3 is an enlarged cross-sectional view of a portion II in FIG.
FIG. 4 is an enlarged cross-sectional view of a portion I in FIG.
FIG. 5 is a partial cross-sectional view of the chimney of FIG.
FIG. 6 is an explanatory view showing a method for assembling a fireproof and heat insulating cylinder according to the present invention.
FIG. 7 is an explanatory view showing a method of manufacturing a chimney according to the present invention.
FIG. 8 is an explanatory view showing another method of manufacturing a chimney according to the present invention.
FIG. 9 is a cross-sectional view showing a conventional method of manufacturing a chimney.
FIG. 10 is a cross-sectional view of a conventional chimney.
[Explanation of symbols]
1 ... combustion furnace 2 ... chimney 5 ... ceramic kiln 6 ... burner 10 ········· Heat seal material 12 ·················································································· .... Inner wall cylinder 22 ... Fireproof insulation cloth

Claims (4)

In the cylindrical chimney that is connected to the exhaust port of the pottery kiln and discharges the combustion gas discharged from the exhaust port to the outside ,
The chimney is composed of a metal cylinder constituting the outer wall thereof and a fire-resistant and heat-insulating cylinder inserted into the inner surface of the metal cylinder , and the fire-resistant and heat-insulating cylinder is formed of a fire-resistant and heat-insulating material in a cylindrical shape. The inner wall cylinder includes a molded inner wall cylinder and a fireproof heat insulating cloth made of a fireproof heat insulating fiber and attached to the inner wall cylinder, and is formed by bending an axial end of the fireproof heat insulating cloth inward. A chimney of a pottery kiln, characterized in that a plurality of the fire-resistant and heat-insulating cylinders enclosing the end faces of the pottery are arranged so as to be in close contact with each other. A plurality of chimneys are connected by forming a diameter of one end of the metal cylinder larger than the other part and fitting the other end of another metal cylinder to the one end. Item 1. A chimney of a ceramic pottery according to item 1. The ceramic fire chimney according to claim 1 or 2 , wherein a ceramic fiber is used as the fireproof heat insulating material. The ceramic fire chimney according to any one of claims 1 to 3, wherein a ceramic fiber is used as the fireproof and heat insulating fiber.

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