JP2015075279A - Firing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To appropriately fire a plurality of firing targets.SOLUTION: A firing apparatus includes: a muffle furnace main body 6 that forms a firing atmosphere 11 where a plurality of firing targets 13 is arranged; a burner 2 that supplies high temperature gas to a furnace inner space 5 where the muffle furnace main body 6 is arranged; and a resistor having a plurality of through-holes formed therein. At this time, an upward opening portion 12 connecting the furnace internal space 5 to the firing atmosphere 11 is formed in the muffle furnace main body 6. The resistor is arranged to cover the upward opening portion 12. Such a firing apparatus 10 can make uniform an inflow rate distribution of the high temperature gas flowing into the firing atmosphere 11, reduce a dispersion of a temperature distribution of the firing atmosphere 11, and appropriately fire the firing targets 13.

Description

  The present invention relates to a baking apparatus, and more particularly to a baking apparatus used when baking a plurality of long objects to be fired.

  A plurality of cells included in a solid oxide fuel cell (SOFC) are manufactured by firing a long object to be fired. It is desired to reduce warpage of a fired product formed by firing a long product to be fired (see Patent Documents 1 to 6). It is known that warping of a fired product is reduced by firing a long object to be fired in a suspended state (see Patent Documents 2 to 6).

JP 2004-161596 A JP 2006-151749 A Japanese Patent No. 4424899 Japanese Patent No. 2608671 Japanese Patent No. 4335345 Japanese Patent No. 3930963

  Appropriate mass production of a long fired product is desired, and firing is desired by heating a long fired product using combustion gas. The plurality of objects to be fired may not be appropriately fired when the variation in temperature distribution of the plurality of objects to be fired during firing is large. In order to appropriately fire a plurality of objects to be fired, it is desired to reduce variations in temperature distribution of the plurality of objects to be fired during firing.

An object of the present invention is to provide a baking apparatus for appropriately baking a plurality of objects to be fired.
Another object of the present invention is to provide a baking apparatus that reduces variations in temperature distribution in a baking atmosphere for baking a plurality of objects to be fired.
Still another object of the present invention is to provide a firing apparatus that can easily reduce variations in temperature distribution in a firing atmosphere for firing a plurality of objects to be fired.
Still another object of the present invention is to provide a baking apparatus that can reduce variations in temperature distribution of a baking atmosphere for baking a plurality of objects to be fired at low cost.

  The firing apparatus according to the present invention includes a muffle furnace that forms a firing atmosphere in which a plurality of objects to be fired are disposed, a burner that supplies high-temperature gas to the furnace space in which the muffle furnace is disposed, and a plurality of through holes. And a resistor. At this time, the muffle furnace has an upward opening that connects the space in the furnace to the firing atmosphere. The resistor is arranged to cover the upward opening.

  The high temperature gas flows into the firing atmosphere from the furnace space by passing through the plurality of through holes. Such a baking apparatus can make the distribution of the inflow flow rate of the high temperature gas flowing into the baking atmosphere uniform when the high temperature gas passes through the plurality of through-holes, and reduces variations in the temperature distribution of the baking atmosphere. be able to. Such a firing apparatus can appropriately fire a plurality of objects to be fired by reducing variation in temperature distribution of the firing atmosphere.

  The firing apparatus according to the present invention further includes a foreign matter fall prevention plate disposed vertically above the upward opening. Such a foreign matter fall prevention plate prevents the high temperature gas from flowing into the upward opening from the vertical upper side, can appropriately equalize the distribution of the inflow flow rate at which the high temperature gas flows into the firing atmosphere, and the firing atmosphere. The variation in the temperature distribution can be reduced appropriately. Such a firing apparatus can further prevent foreign matter falling from the vertically upper side of the upward opening from entering the firing atmosphere by including the foreign matter fall prevention plate. For this reason, such a baking apparatus appropriately burns a plurality of objects to be fired by reducing variation in temperature distribution of the firing atmosphere or by preventing foreign matter from entering the firing atmosphere. Can do.

  The resistor is formed of a plurality of rod-shaped members that are not joined to each other. The plurality of rod-shaped members can be handled one by one because they are not joined to each other. The resistor can be easily handled by handling a plurality of rod-like members one by one as compared to other resistors formed integrally. For this reason, since such a baking apparatus can handle a resistor easily, it can assemble easily and can bak a several to-be-fired thing easily.

  The firing apparatus according to the present invention further includes a resistor support base in which a plurality of insertion holes into which the plurality of rod-shaped members are respectively inserted are formed. In such a baking apparatus, the plurality of rod-shaped members are easily raised so that the resistor is appropriately formed from the plurality of rod-shaped members by inserting the plurality of rod-shaped members into the plurality of insertion holes, respectively. Positioning can be performed accurately, and variations in the temperature distribution of the firing atmosphere can be easily reduced appropriately. Such a firing apparatus can easily and appropriately fire a plurality of objects to be fired by easily and appropriately reducing variations in the temperature distribution of the firing atmosphere.

  The firing apparatus according to the present invention further includes a resistor support base in which a plurality of grooves in which the plurality of rod-like members are respectively placed are formed. In such a baking apparatus, the plurality of rod-shaped members are easily placed on the plurality of grooves so that the resistor is appropriately formed from the plurality of rod-shaped members. Positioning can be performed accurately, and variations in the temperature distribution of the firing atmosphere can be easily reduced appropriately. Such a firing apparatus can easily and appropriately fire a plurality of objects to be fired by easily and appropriately reducing variations in the temperature distribution of the firing atmosphere.

  The plurality of rod-shaped members are formed from a plurality of fired products produced by firing the plurality of products to be fired. The resistor can be manufactured at low cost by using defective products of the fired product fired by the firing device as the plurality of rod-shaped members. Such a baking apparatus can appropriately burn a plurality of objects to be fired at low cost by reducing the variation in temperature distribution of the firing atmosphere at low cost because the resistor is manufactured at low cost. .

  The firing apparatus according to the present invention can appropriately fire a plurality of objects to be fired by reducing variations in temperature distribution of a firing atmosphere in which the objects to be fired are arranged.

It is sectional drawing which shows a baking apparatus. It is a perspective view which shows a muffle furnace upper structure. It is sectional drawing which shows a muffle furnace upper structure. It is a top view which shows a resistor. It is a perspective view which shows another muffle furnace upper structure. It is a side view which shows another muffle furnace upper structure. It is a top view which shows another resistor. It is a side view which shows another resistor. It is a side view which shows another muffle furnace upper structure. It is a perspective view which shows another muffle furnace upper structure. It is a perspective view which shows a foreign material fall prevention board.

  An embodiment of a firing apparatus will be described below with reference to the drawings. As shown in FIG. 1, the firing device 10 includes a firing furnace 1, a burner 2, and a muffle furnace 3. The firing furnace 1 forms a furnace space 5 that is isolated from the external environment. The burner 2 generates hot gas by burning fuel, and injects the hot gas into the lower part of the furnace space 5.

  The muffle furnace 3 includes a muffle furnace main body 6, a cell suspension member 7, and a muffle furnace upper structure 8. The muffle furnace body 6 is formed in a cylindrical shape, and forms a firing atmosphere 11 therein. The muffle furnace body 6 is arranged in the furnace space 5 so that the longitudinal direction of the firing atmosphere 11 is along the vertical direction. The muffle furnace body 6 has an upward opening 12 formed at the upper end of the muffle furnace body 6. The firing atmosphere 11 is connected to the outside of the muffle furnace body 6 in the furnace space 5 through the upward opening 12. The firing atmosphere 11 is further connected to the outside of the furnace space 5 through the lower end of the muffle furnace body 6.

  The cell suspension member 7 is disposed in the vicinity of the upward opening 12 and is fixed to the muffle furnace body 6. The cell suspension member 7 holds one end of a plurality of long objects to be fired 13 so that the objects to be fired 13 are arranged in the firing atmosphere 11 along the vertical direction. A plurality of objects to be fired 13 are supported so that the object 13 does not contact the muffle furnace body 6. The plurality of objects to be fired 13 are formed in a cylindrical shape and fired to form a plurality of cells included in a solid oxide fuel cell (SOFC).

  As shown in FIG. 2, the muffle furnace upper structure 8 is arranged vertically above the muffle furnace body 6 so as to close the upward opening 12 of the muffle furnace body 6. As shown in FIG. 3, the muffle furnace upper structure 8 is formed in a box shape and forms an internal space 14 therein. The muffle furnace upper structure 8 is arranged vertically above the muffle furnace body 6 so that the internal space 14 is connected to the firing atmosphere 11.

  The muffle furnace upper structure 8 includes a resistor support base 15 and a top plate 16. The resistor support base 15 is formed of a plurality of plate materials. The plurality of plate members are respectively arranged along a plurality of parallel planes parallel to the vertical direction, and are joined to each other. A lateral opening 17 is formed in two plate members along a pair of parallel surfaces of the resistor support base 15. The lateral opening 17 connects the furnace space 5 to the internal space 14. The resistor support base 15 further includes a resistor support surface 18 formed on the plurality of plate members. The resistor support surface 18 is formed vertically below the lateral opening 17, and when the muffle furnace upper structure 8 is arranged vertically above the muffle furnace main body 6, generally along one horizontal plane, And it is formed so that the normal line may face vertically upward.

  The top plate 16 is formed in a plate shape. The top plate 16 is disposed along a horizontal plane, is disposed vertically above the upward opening 12 of the muffle furnace 3, and is fixed to the resistor support base 15. Furthermore, the top plate 16 covers the upper part of the upward opening 12, that is, a top plate figure obtained by orthogonally projecting the top plate 16 onto a certain horizontal plane, and an upward opening figure obtained by projecting the upward opening 12 onto the horizontal plane. It is formed so that it may contain.

  The firing apparatus 10 further includes a resistor 21. The resistor 21 is formed in a plate shape, and the edge is placed on the resistor support surface 18, so that the plurality of objects to be fired 13 do not contact the resistor 21 and are arranged in the internal space 14. . The resistor 21 covers the upward opening 12 of the muffle furnace 3 by being arranged in this way. As shown in FIG. 4, the resistor 21 is formed from a net produced by knotting nodes where a plurality of wire rods intersect. That is, the resistor 21 has a plurality of through holes 22 formed therein. At this time, the plurality of through holes 22 correspond to the plurality of objects to be fired 13. The through-hole corresponding to a to-be-fired product among the plurality of through-holes 22 is arranged on the vertically upper side of the to-be-fired product.

  The firing apparatus 10 is used when firing a plurality of objects to be fired 13. First, one end of each of the plurality of objects to be fired 13 is suspended from the cell so as not to contact the muffle furnace body 6 and to be disposed in the firing atmosphere 11 in the furnace of the muffle furnace body 6 along the vertical direction. It is gripped by the member 7. The burner 2 generates a high-temperature gas by burning fuel after the plurality of objects to be fired 13 are appropriately arranged in the firing atmosphere 11, and supplies the high-temperature gas to the lower part of the furnace space 5 of the firing furnace 1. To do. The burner 2 further controls the temperature of the high-temperature gas so that the plurality of objects to be fired 13 undergo a predetermined temperature change.

  The high-temperature gas is supplied to the lower portion of the furnace space 5, and ascends outside the muffle furnace body 6 in the furnace space 5. The hot gas moves up in the furnace space 5 and then moves in the horizontal direction through the lateral opening 17 in the inner space 14 of the muffle furnace upper structure 8. The hot gas is supplied to the internal space 14 from the lateral opening 17, then descends through the plurality of through holes 22 formed in the resistor 21, and is supplied to the firing atmosphere 11 in the furnace of the muffle furnace body 6. Is done. When the high-temperature gas is supplied to the firing atmosphere 11, the firing atmosphere 11 is lowered, the firing atmosphere 11 is heated, and the plurality of objects to be fired 13 are heated. The plurality of objects to be fired 13 are fired by being heated. The plurality of objects to be fired 13 are formed into a plurality of cells used for the solid oxide fuel cell by being fired. The hot gas is exhausted to the outside of the furnace space 5 through the lower end of the muffle furnace body 6 after descending the firing atmosphere 11.

  The high-temperature gas passes through the resistor 21, so that the flow rates of the plurality of high-temperature gases passing through the plurality of through holes 22 are made uniform. In other words, the firing device 10 includes the resistor 21 so that the inflow flow rate of the high-temperature gas flowing into the firing atmosphere 11 is more horizontally distributed than the firing device of the comparative example in which the resistor 21 is not provided. It can be made more uniform. The firing apparatus 10 can reduce variations in the temperature distribution of the firing atmosphere 11 by making the horizontal distribution of the flow rate of the high-temperature gas flowing into the firing atmosphere 11 uniform. When the variation in temperature distribution of the firing atmosphere 11 is small, the plurality of objects to be fired 13 can be uniformly heated and fired appropriately. For this reason, the firing apparatus 10 can appropriately fire the plurality of objects to be fired 13 by reducing variations in the temperature distribution of the firing atmosphere 11.

  Furthermore, in the baking apparatus 10, the top plate 16 is arranged vertically above the lateral opening 17, so that foreign matter falling from the top of the top plate 16 accumulates on the top plate 16, and the foreign matter is the resistor 21. And the horizontal opening 17 can be prevented from entering the firing atmosphere 11. The plurality of objects to be fired 13 may not be properly fired when a large amount of foreign matter adheres. For this reason, the firing apparatus 10 can appropriately fire the plurality of objects to be fired 13 by preventing foreign matter from entering the firing atmosphere 11.

  The resistor 21 can be replaced by another resistor that divides the upward opening 12 into a plurality of flow paths. Examples of the resistor include those in which a plurality of through holes are formed by processing a plate like punching metal. The firing apparatus provided with such a resistor also reduces the variation in the temperature distribution of the firing atmosphere 11 and appropriately fires the plurality of objects to be fired 13 in the same manner as the firing apparatus 10 in the above-described embodiment. Can do.

  In another embodiment of the firing apparatus, the muffle furnace upper structure 8 of the firing apparatus 10 in the above-described embodiment is replaced with another muffle furnace upper structure. As shown in FIG. 5, the muffle furnace upper structure 31 is formed in a box shape in the same manner as the muffle furnace upper structure 8, and the muffle furnace main body is connected to the firing atmosphere 11. 6 is arranged vertically above. The muffle furnace upper structure 31 includes a resistor support base 32 and a top plate 33.

  The resistor support base 32 is formed of a plurality of plate members, and the plurality of plate members are joined to each other along a plurality of parallel planes parallel to the vertical direction. The resistor support base 32 has a lateral opening 34 formed in each of the plurality of plate members. The lateral opening 34 connects the furnace space 5 to the internal space of the muffle furnace upper structure 31. The top plate 33 is formed in a plate shape, and is fixed to the resistor support base 32 so as to be arranged vertically above the upward opening 12 of the muffle furnace 3.

  Further, as shown in FIG. 6, the resistor support base 32 has a plurality of insertion holes 35 formed in each of the plurality of plate members. The plurality of insertion holes 35 are formed vertically below the lateral opening 34. A plurality of insertion holes 35 formed in an arbitrary plate material among the plurality of plate materials are arranged in the horizontal direction.

  In such a baking apparatus, the resistor 21 in the above-described embodiment is further replaced with another resistor 36. As shown in FIG. 7, the resistor 36 is formed of a plurality of first rod-shaped members 37 and a plurality of second rod-shaped members 38. The plurality of first rod-shaped members 37 and the plurality of second rod-shaped members 38 are each formed of defective products among the plurality of fired products produced by firing the plurality of products to be fired 13. The plurality of first rod-shaped members 37 and the plurality of second rod-shaped members 38 can be formed at low cost by being formed of defective products.

  As shown in FIG. 8, the plurality of first rod-shaped members 37 are arranged so as to overlap a certain horizontal plane. The plurality of second rod-shaped members 38 are arranged so as to be in contact with the plurality of first rod-shaped members 37 so as to overlap another horizontal plane different from the horizontal plane overlapping the plurality of first rod-shaped members 37. As shown in FIG. 7, the resistor 36 includes a plurality of first rod members 37 arranged along a plurality of parallel lines, and a plurality of second rod members 38 perpendicular to the plurality of parallel lines. By being arranged along a plurality of parallel lines, it is formed in a net shape. That is, the resistor 36 has a plurality of through holes 39 formed therein. At this time, the plurality of through holes 39 correspond to the plurality of objects to be fired 13. The through-hole corresponding to a to-be-fired product among the plurality of through-holes 39 is arranged vertically above the to-be-fired product.

  Each of the plurality of first rod-shaped members 37 and the plurality of second rod-shaped members 38 corresponds to two opposed insertion holes of the plurality of insertion holes 35 formed in the resistor support base 32. The plurality of first rod-shaped members 37 and the plurality of second rod-shaped members 38 are formed in a net shape by being inserted into the two insertion holes, respectively. That is, the plurality of insertion holes 35 formed in the resistor support base 32 have a plurality of first holes when the plurality of first rod members 37 and the plurality of second rod members 38 are inserted into the plurality of insertion holes 35. One rod-shaped member 37 and a plurality of second rod-shaped members 38 are arranged so as to be formed in a predetermined net shape.

  The plurality of first rod-shaped members 37 and the plurality of second rod-shaped members 38 correspond one by one so that the plurality of objects to be fired 13 are appropriately arranged in the firing atmosphere 11 and then formed in the resistor 36. Are inserted into the two insertion holes. The burner 2 generates a high-temperature gas by burning fuel after the resistor 36 is appropriately formed, and supplies the high-temperature gas to the lower part of the furnace space 5 of the firing furnace 1. The high temperature gas descends the firing atmosphere 11 through the plurality of through holes 39 of the resistor 36 in the same manner as the high temperature gas used in the firing apparatus 10 in the above-described embodiment, and a plurality of objects to be fired. 13 is fired.

  In such a baking apparatus, similarly to the baking apparatus 10 in the above-described embodiment, by passing a high-temperature gas through the resistor 36, variation in the temperature distribution of the baking atmosphere 11 is reduced, and a plurality of baking objects are performed. The product 13 can be appropriately fired.

  The resistor 36 can be handled more easily by handling the plurality of first rod members 37 and the plurality of second rod members 38 one by one compared to the resistor 21 in the above-described embodiment. And can be installed on the resistor support base 32 more easily. For this reason, such a baking apparatus is easily assembled as compared with the baking apparatus in the embodiment described above, because the resistor 36 is easily installed on the resistor support base 32. A plurality of objects to be fired 13 can be easily fired appropriately. Such a baking apparatus can be formed at a low cost by further forming a plurality of first rod-shaped members 37 and a plurality of second rod-shaped members 38 from defective products, and a plurality of objects to be fired. 13 can be appropriately fired at a low cost.

  In still another embodiment of the firing apparatus, the muffle furnace upper structure 31 in the above-described embodiment is replaced with another muffle furnace upper structure. The muffle furnace upper structure 41 is formed in a box shape in the same manner as the muffle furnace upper structure 8 and is arranged vertically above the muffle furnace body 6 so that the internal space is connected to the firing atmosphere 11. Yes. As shown in FIG. 9, the muffle furnace upper structure 41 includes a resistor support base 42 and a top plate 43.

  The resistor support base 42 is formed of a plurality of plate members, and the plurality of plate members are joined to each other along a plurality of parallel planes parallel to the vertical direction. The resistor support base 42 has a lateral opening 44 formed in each of the plurality of plate members. The lateral opening 44 connects the furnace internal space 5 to the internal space of the muffle furnace upper structure 31. The top plate 33 is formed in a plate shape, and is fixed to the resistor support base 42 so as to be arranged vertically above the upward opening 12 of the muffle furnace 3.

  In the resistor support base 42, a plurality of grooves 45 are formed at the lower end of the lateral opening 44. Each of the plurality of first rod-shaped members 37 and the plurality of second rod-shaped members 38 corresponds to two opposing grooves of the plurality of grooves 45. The plurality of first rod-shaped members 37 and the plurality of second rod-shaped members 38 are each formed in a net shape by being placed in the two grooves. That is, the plurality of grooves 45 are formed such that when the plurality of first rod members 37 and the plurality of second rod members 38 are placed in the plurality of grooves 45, the plurality of first rod members 37 and the plurality of second rod shapes. It arrange | positions so that the member 38 may be formed in predetermined | prescribed net shape.

  Similarly to the muffle furnace upper structure 31 in the above-described embodiment, the muffle furnace upper structure 41 also handles the plurality of first rod members 37 and the plurality of second rod members 38 one by one, The resistor 36 can be easily installed on the resistor support base 42. For this reason, the firing apparatus including the muffle furnace upper structure 41 easily and appropriately fires the plurality of objects to be fired 13 in the same manner as the firing apparatus including the muffle furnace upper structure 31 in the above-described embodiment. be able to.

  The plurality of first rod-shaped members 37 and the plurality of second rod-shaped members 38 are formed from a plurality of dedicated rod-shaped members different from the plurality of fired products produced by firing the plurality of objects to be fired 13. Can. The firing apparatus can easily handle the resistor 36 even when the resistor 36 is formed from a plurality of dedicated rod-shaped members, and can easily and appropriately fire the plurality of objects 13 to be fired.

  It should be noted that the top plates 16 and 33 have a sufficient amount of foreign matter falling from vertically above the opening 12 when the resistances 21 and 36 can sufficiently reduce the variation in temperature distribution of the firing atmosphere 11. When it is few, it can be omitted. In the baking apparatus in which the top plates 16 and 33 are omitted, in the same manner as the baking apparatus in the above-described embodiment, the variation in the temperature distribution of the baking atmosphere 11 is reduced, so that the plurality of objects to be fired 13 can be appropriately disposed. It can be fired.

  In another embodiment of the firing apparatus, the muffle furnace upper structure in the above-described embodiment is further replaced with another muffle furnace upper structure. The muffle furnace upper structure 51 is formed in a box shape as shown in FIG. The muffle furnace upper structure 51 is arranged vertically above the muffle furnace body 6 so as to close the upward opening 12 of the muffle furnace body 6. The muffle furnace upper structure 51 further has an internal space connected to the firing atmosphere 11.

  The muffle furnace upper structure 51 includes a side wall 52 and a top plate 53. The side wall 52 is formed of a plurality of plate materials that are not formed with a lateral opening that connects the internal space of the muffle furnace upper structure 51 to the outside. The top plate 53 is formed in a plate shape. The top plate 53 is joined to the side wall 52 so as to be disposed along the horizontal plane. Furthermore, the top plate 53 has a plurality of through holes 54 formed like punching metal.

  The muffle furnace upper structure 51 includes a foreign matter fall prevention plate. The foreign matter fall prevention plate 55 is formed in a plate shape as shown in FIG. The foreign matter fall prevention plate 55 includes a plurality of legs 56. The plurality of leg portions 56 are placed on the upper end of the muffle furnace body 6 or placed on the top plate 53 of the muffle furnace upper structure 51 so that the foreign matter fall prevention plate 55 is in a predetermined position. The foreign matter fall prevention plate 55 is supported by the muffle furnace main body 6 so as to be disposed at the bottom. That is, the foreign substance fall prevention plate 55 is arranged along the horizontal plane by being supported by the plurality of leg portions 56 and is arranged so as to cover the upper portions of the plurality of through holes 54. That is, the foreign matter fall prevention plate 55 is formed such that the foreign matter fall prevention plate figure obtained by orthogonally projecting the foreign matter fall prevention plate 55 onto a certain horizontal plane includes through hole figures obtained by orthogonally projecting the plurality of through holes 54 onto the horizontal plane. ing.

  At this time, the high-temperature gas supplied to the lower part of the furnace space 5 moves up the furnace space 5 and then moves horizontally below the foreign object drop prevention plate 55, and passes through a plurality of penetrations formed in the top plate 53. Through the hole 54, the muffle furnace body 6 is supplied to the firing atmosphere 11 in the furnace. The firing apparatus provided with the muffle furnace upper structure 51 also reduces variations in the temperature distribution of the firing atmosphere 11 by allowing the high-temperature gas to pass through the plurality of through holes 54 in the same manner as the firing apparatus in the above-described embodiment. The plurality of objects to be fired 13 can be fired appropriately.

  The foreign matter fall prevention plate 55 falls into the firing atmosphere 11 when the top plate 53 can sufficiently reduce the variation in temperature distribution of the firing atmosphere 11 and through the top plate 53 and the upward opening 12. It can be omitted when there are enough foreign objects to do. Similarly to the baking apparatus in the above-described embodiment, the baking apparatus in which the foreign matter fall prevention plate 55 is omitted can appropriately dispose the plurality of objects to be sintered 13 by reducing the variation in the temperature distribution of the baking atmosphere 11. It can be fired.

  Note that the plurality of objects to be fired 13 can be replaced with other objects to be fired formed in other products different from the cells of the solid oxide fuel cell. The product is exemplified by a high-purity alumina tube that fixes the copper electrode of the excimer laser layer. The firing apparatus in the above-described embodiment can appropriately fire such a plurality of objects to be fired by reducing the variation in the temperature distribution of the firing atmosphere 11.

1: firing furnace 2: burner 3: muffle furnace 5: furnace space 6: muffle furnace body 7: cell suspension member 8: muffle furnace upper structure 10: firing apparatus 11: firing atmosphere 12: upward opening 13: plural 14: Internal space 15: Resistor support base 16: Top plate 17: Side opening 18: Resistor support surface 21: Resistor 22: Multiple through holes 31: Muffle furnace upper structure 32: Resistor Support base 33: Top plate 34: Lateral opening 35: Multiple insertion holes 36: Resistor 37: Multiple first rod members 38: Multiple second rod members 39: Multiple through holes 41: Muffle furnace upper structure 42: Resistor support 43: Top plate 44: Side opening 45: Multiple grooves 51: Muffle furnace upper structure 52: Side wall 53: Top plate 54: Multiple through holes 55: Foreign matter fall prevention plate

Claims (6)

A muffle furnace for forming a firing atmosphere in which a plurality of objects to be fired are disposed;
A burner for supplying high-temperature gas to a furnace space in which the muffle furnace is disposed;
Including a resistor in which a plurality of through holes are formed,
The muffle furnace has an upward opening that connects the furnace space to the firing atmosphere,
The firing device, wherein the resistor is arranged to cover the upward opening.   The firing apparatus according to claim 1, further comprising a foreign matter fall prevention plate arranged vertically above the upward opening.   The firing apparatus according to claim 1, wherein the resistor is formed of a plurality of rod-shaped members that are not joined to each other.   The firing apparatus according to claim 3, further comprising a resistor support base in which a plurality of insertion holes into which the plurality of rod-shaped members are respectively inserted are formed.   The firing apparatus according to claim 3, further comprising a resistor support base on which a plurality of grooves on which the plurality of rod-shaped members are respectively placed are formed.   The firing apparatus according to any one of claims 3 to 5, wherein the plurality of rod-shaped members are formed from a plurality of fired products produced by firing the plurality of products to be fired. .

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