JP7175581B2 - Bell type furnace cooling device and cooling method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a cooling device and method for a bell-type furnace, in which a material to be treated such as a coil is heated and treated in the inner cover and then cooled in the inner cover after the heat treatment. . In particular, when the heat-treated material is cooled in the inner cover, the heat-treated material in the inner cover is shortened so that the inner cover is not damaged by thermal stress due to rapid cooling of the inner cover. It is characterized by being able to cool efficiently in time.

Conventionally, in a bell-shaped furnace, coils and other materials to be treated are placed on a base via spacers in multiple stages, covered with an inner cover, and then the inner cover is covered with a heating cover. After heating and soaking (annealing) the treatment material in the inner cover with a burner or the like provided in the heating cover, the heating cover is removed on the outer peripheral side of the inner cover, and the heat treatment is performed. The treatment material is cooled within the inner cover.

In order to cool the heat-treated material in the inner cover, as disclosed in Patent Documents 1 and 2, a cooling cover is placed on the outer peripheral side of the inner cover after the heating cover is removed. First, a cooling gas is flowed between the cooling cover and the inner cover to gradually cool (slowly cool) to a predetermined temperature at which the inner cover is not deformed or damaged, and then It has been proposed to spray cooling liquid such as water on the outer surface of the inner cover to quickly cool the treatment material in the inner cover to a desired temperature.

However, when the cooling gas is flowed between the cooling cover and the inner cover to gradually cool the inner cover to a predetermined temperature as described above, the cooling gas flowing between the cooling cover and the inner cover causes the inner cover to cool. Since cooling is mainly performed by the flow of gas, which takes heat radiated from the cover and discharges the heated cooling gas to the outside, the rate of temperature decrease is too slow even with slow cooling. It takes a lot of time to slowly cool the inner cover to the specified temperature, and the overall time required to cool the treatment material in the inner cover to the target temperature is long, which greatly reduces the productivity of the equipment. I had a problem.

In addition, in order to cool the processing material in the inner cover in a short time, the time for cooling the inner cover by flowing cooling gas between the cooling cover and the inner cover is shortened, and the inner cover in a hot state is cooled. If the cooling liquid is sprayed on the outer surface of the inner cover, or if the cooling liquid is sprayed on the outer surface of the inner cover that is in a hot state from the beginning without cooling the inner cover with cooling gas, the inner cover will be in a high temperature state. When the cooling liquid is sprayed, the temperature difference between the cooling liquid and the cooling liquid becomes too large, and a load is applied to the inner cover, which may cause local deformation or cracking of the inner cover.

JP-A-6-100948 JP-A-6-271945

The present invention provides a cooling apparatus and cooling method for a bell-shaped furnace in which a material to be treated such as a coil is heated and treated in the inner cover, and then the heat-treated material is cooled in the inner cover. The task is to solve various problems such as

In the present invention, in the bell-shaped furnace as described above, a cooling cover is provided on the outer peripheral side of the inner cover, and the inner cover is damaged when cooling the heat-treated material in the inner cover. It is an object of the present invention to cool a heat-treated material in an inner cover to a target temperature in a short period of time.

In order to solve the above-described problems, the cooling apparatus for a bell-shaped furnace according to the present invention cools the heat-treated material in the inner cover. A double cooling cover having an inner cooling cover and an outer cooling cover with an open top is provided on the outer peripheral side of the inner cover housing the cooling gas, and the cooling gas is supplied to the inner cover and the inner cooling cover a cooling gas guiding means for flowing through between the cover, a first cooling liquid spraying means for spraying the cooling liquid on the outer surface of the inner cooling cover, and a second cooling liquid for spraying the cooling liquid on the outer surface of the inner cover. and a liquid spraying means.

In the cooling apparatus for a bell-shaped furnace according to the present invention, the cooling gas guide means sucks the cooling gas between the inner cover and the inner cooling cover to A suction fan is provided to exhaust the cooling gas heated between the inner cover and the inner cover, or the cooling gas is blown between the inner cover and the inner cooling cover. It is possible to provide a blower fan for exhausting the cooling gas heated between.

Further, in the cooling apparatus for a bell-type furnace according to the present invention, the first cooling liquid spraying means for spraying the cooling liquid on the outer surface of the inner cooling cover, and the second cooling liquid spraying means for spraying the cooling liquid on the outer surface of the inner cover. When the cooling liquid is supplied to the means, switching means is provided in the cooling liquid guide pipe for guiding the cooling liquid from the cooling liquid supply device to the first cooling liquid spraying means and the second cooling liquid spraying means. The cooling liquid guided through the cooling liquid guide pipe by means can be switched between the first cooling liquid spraying means and the second cooling liquid spraying means. It is also possible to individually supply the cooling liquid from the cooling liquid supply device to the first cooling liquid spraying means and the second cooling liquid spraying means through separately provided cooling liquid guide pipes.

Further, in the cooling apparatus for a bell-type furnace according to the present invention, the outer cooling cover of the double cooling cover may be eliminated.

In order to solve the above problems, the method for cooling a bell-shaped furnace according to the present invention uses the cooling device for a bell-shaped furnace as described above, and the cooling gas is introduced by the cooling gas guide means. and the cooling liquid is sprayed from the first cooling liquid spraying means to the outer surface of the inner cooling cover to cool the inner cover to a predetermined temperature. The cooling liquid is sprayed on the outer surface of the inner cover from the second cooling liquid spraying means to cool the processing material in the inner cover.

Then, as in the cooling method for a bell-shaped furnace according to the present invention, the cooling gas is caused to flow between the inner cover and the inner cooling cover by the cooling gas guide means, and the first cooling liquid spraying means causes the cooling gas to flow. When the cooling liquid is sprayed on the outer surface of the inner cooling cover, the inner cooling cover provided on the outer periphery of the inner cover is cooled by the cooling liquid sprayed from the first cooling liquid spraying means, and the inner cover and the inner cooling cover are cooled. The temperature difference between the inner cover and the inner cover increases, promoting radiative cooling from the inner cover, and the cooling gas flowing between the inner cover and the inner cooling cover draws heat from the inner cooling cover. The cooling of the inner cover by the cooling gas can be efficiently performed, and the inner cover can be gradually cooled to a predetermined temperature in a shorter time than conventionally, and the outer surface of the inner cover can be cooled by the second cooling liquid spraying means. It is possible to shorten the time required to cool the treatment material in the inner cover to the target temperature by spraying the cooling liquid on the inner cover.

In the present invention, in the cooling device for a bell-shaped furnace that cools the heat-treated material in the inner cover, the inner cooling cover and the upper part are provided on the outer peripheral side of the inner cover in which the heat-treated material is accommodated. a double cooling cover having an open outer cooling cover, cooling gas guiding means for flowing cooling gas between the inner cover and the inner cooling cover; and the inner cooling cover. A first cooling liquid spraying means for spraying the cooling liquid on the outer surface of the cover and a second cooling liquid spraying means for spraying the cooling liquid on the outer surface of the inner cover are provided. was flowed between the inner cover and the inner cooling cover, and the first cooling liquid spraying means sprayed the cooling liquid on the outer surface of the inner cooling cover to slowly cool the inner cover to a predetermined temperature. Thereafter, the cooling liquid is sprayed from the second cooling liquid spraying means to the outer surface of the inner cover to cool the processing material in the inner cover to the target temperature.

Then, as in the present invention, the cooling gas guide means causes the cooling gas to flow between the inner cover and the inner cooling cover, and the first cooling liquid is applied to the outer surface of the inner cooling cover provided on the outer periphery of the inner cover. When the cooling liquid is sprayed from the spraying means, the inner cooling cover is quickly cooled by the cooling liquid sprayed from the first cooling liquid spraying means, the temperature difference between the inner cover and the inner cooling cover increases, and the inner Heat dissipation from the cover is accelerated, and the cooling gas flowing between the inner cover and the inner cooling cover draws heat from the inner cooling cover, so that the inner cover can be slowly cooled efficiently by the cooling gas. become.

As a result, in the bell-type furnace cooling apparatus and cooling method of the present invention, the inner cover can be gradually cooled to a predetermined temperature in a shorter time than in the conventional art. After cooling, the cooling liquid is sprayed on the outer surface of the inner cover by the second cooling liquid spraying means, and the cooling liquid is sprayed on the outer surface of the inner cover in a high temperature state from the beginning in order to cool the processing material in the inner cover. As in the case, the inner cover is not locally deformed or cracked due to the load applied to the inner cover due to the temperature difference with the coolant. The material to be treated can be cooled to the desired temperature within the inner cover in a short period of time, greatly improving the productivity of the facility.

A cooling apparatus for a bell-shaped furnace according to an embodiment of the present invention has an inner cooling cover and an outer cooling cover with an open top on the outer peripheral side of an inner cover in which heat-treated material is accommodated. FIG. 4 is a schematic cross-sectional explanatory view showing a state in which a double cooling cover, cooling gas guide means, first cooling liquid spraying means, and second cooling liquid spraying means are provided; In the cooling apparatus for a bell-shaped furnace according to the above-described embodiment, (A) causes the cooling gas to flow between the inner cover and the inner cooling cover by the cooling gas guide means, A schematic cross-sectional explanatory view showing a state in which the inner cover is cooled to a predetermined temperature by spraying cooling liquid on the outer surface of the cooling cover, (B) is a second cooling liquid sprayed after the inner cover is cooled to the predetermined temperature. FIG. 4 is a schematic cross-sectional explanatory view showing a state in which a cooling liquid is directly sprayed on the outer surface of the inner cover by means to cool the processing material in the inner cover. is. FIG. 5 is a schematic cross-sectional explanatory view showing a first modified example in which the first cooling liquid spraying means in the cooling device for the bell-shaped furnace according to the embodiment is changed; FIG. 5 is a schematic cross-sectional explanatory view showing a second modified example in which the first cooling liquid spraying means in the cooling device for the bell-shaped furnace according to the embodiment is changed. Schematic diagram showing a third modification in which the cooling gas guide means is modified in the first modification in which the first cooling liquid spraying means is modified in the cooling apparatus for the bell-shaped furnace according to the above-described embodiment. It is cross-sectional explanatory drawing. Schematic diagram showing a fourth modification in which the cooling gas guide means is modified in the first modification in which the first cooling liquid spraying means is modified in the cooling apparatus for the bell-shaped furnace according to the above-described embodiment. It is cross-sectional explanatory drawing. FIG. 4 is a schematic cross-sectional explanatory view showing an example in which the outer cooling cover in the double cooling cover is removed in the cooling device for the bell-shaped furnace according to the embodiment; FIG. 5 is a schematic cross-sectional explanatory view showing an example in which the outer cooling cover in the double cooling cover is extended downward in the cooling device for the bell-shaped furnace according to the embodiment; FIG. 10 is a graph comparing the state in which the temperature of the material to be treated decreases when the bell-type furnace cooling method of the present invention is used, with that of the conventional method.

A cooling device and a cooling method for a bell-type furnace according to embodiments of the present invention will be specifically described with reference to the accompanying drawings. The cooling device and cooling method for a bell-type furnace according to the present invention are not limited to those shown in the following embodiments, and can be modified as appropriate without changing the gist of the invention.

In the cooling apparatus for a bell-shaped furnace according to this embodiment, the treatment materials W are stacked in multiple stages with spacers S interposed in the inner cover 10, and a heating cover (not shown) is provided on the outer peripheral side of the inner cover 10. After heating and soaking (annealing) the processing material W housed in the inner cover 10 by a burner (not shown) provided in the inner cover 10, the heating cover (not shown) is removed. Thus, the processing materials W stacked and accommodated in a plurality of stages are cooled within the inner cover 10 .

In the cooling device for the bell-shaped furnace in this embodiment, as shown in FIGS. A double cooling cover 20 having an inner cooling cover 21 and an outer cooling cover 22 with an open top is provided on the side.

A suction fan 31 is provided on the outer peripheral side of the upper portion of the outer cooling cover 22 as a cooling gas guide means 30 for flowing the cooling gas between the inner cover 10 and the inner cooling cover 21. and the inner cooling cover 21, a guide pipe 32 is provided for guiding the cooling gas heated between the inner cooling cover 21 and the suction fan 31 to the outside.

In this embodiment, the suction fan 31 is rotated to supply the outside air to the inner cover 10 through the outside air introducing portion 23 in the lower portion of the inner cooling cover 21 and the outer cooling cover 22. and the inner cooling cover 21, and the outside air is caused to flow between the inner cover 10 and the inner cooling cover 21 to cool the heated inner cover 10 by the outside air. The outside air heated by is exhausted to the outside through the guide pipe 32 .

Further, in this embodiment, the first cooling liquid spraying means 40 for spraying the cooling liquid x on the outer surface of the inner cooling cover 21 sprays the cooling liquid x on the upper central portion of the inner cooling cover 21. A first shower member 41 is provided, and a second shower member 51 for spraying the cooling liquid x to the upper central portion of the inner cover 10 serves as a second cooling liquid spraying means 50 for spraying the cooling liquid x on the outer surface of the inner cover 10 . is provided.

In this embodiment, when the coolant x is supplied to the first shower member 41 and the second shower member 51, the coolant x is supplied from the coolant supply device 60 to the first shower member 41 and the second shower member 51. 2, a coolant guide pipe 61 leading to the shower member 51 is provided, and a three-way valve 62 is provided as a switching means 62 in the middle of the coolant guide pipe 61. By this three-way valve 62, the coolant supply device 60 is connected to the coolant guide pipe. To which of the first shower member 41 and the second shower member 51 the coolant x guided through 61 is supplied is switched. In this embodiment, the cooling liquid x guided from the cooling liquid supply device 60 through the cooling liquid guide pipe 61 is supplied to either the first shower member 41 or the second shower member 51 by the three-way valve 62. However, the method of supplying the cooling liquid x from the cooling liquid supply device 60 to the first shower member 41 and the second shower member 51 through the cooling liquid guide pipe 61 is not limited to this. Although not shown, cooling liquid guide pipes 61 for guiding the cooling liquid x from the cooling liquid supply device 60 to the first shower member 41 and the second shower member 51 are individually provided, and each cooling liquid guide pipe 61 has a An opening/closing control valve (not shown) may be provided for each, and the cooling liquid x may be individually supplied to the first shower member 41 and the second shower member 51 through each cooling liquid guide pipe 61 . Although not shown, the cooling liquid guide pipe 61 has a structure that can be separated in order to remove the cooling cover 20 . Also, the flow of the cooling liquid x is indicated by a dotted line.

Moreover, the cooling liquid x after being sprayed from the first shower member 41 onto the outer surface of the inner cooling cover 21 as described above and the cooling liquid x after being sprayed from the second shower member 51 onto the outer surface of the inner cover 10 In this embodiment, a ring-shaped coolant recovery part 63 is provided below the inner cooling cover 21 and the outer cooling cover 22 on the outer peripheral side of the inner cover 10, and the first shower member The coolant x after being sprayed on the outer surface of the inner cooling cover 21 from 41 and the coolant x after being sprayed on the outer surface of the inner cover 10 from the second shower member 51 are introduced into the coolant recovery section 63. The cooling liquid x recovered in the cooling liquid recovery section 63 is drained through a drainage section (not shown).

In this embodiment, the double cooling cover 20 having the inner cooling cover 21 and the outer cooling cover 22 with an open top is provided on the outer peripheral side of the inner cover 10, as shown in FIG. As shown in A), the suction fan 31 is rotated to introduce outside air into the inner cover 10 and the inner cooling cover 21 through the outside air introducing portion 23 at the lower portion of the inner cooling cover 21 and the outer cooling cover 22. and the outside air is flowed between the inner cover 10 and the inner cooling cover 21 to cool the hot inner cover 10, and the outside air heated by the heat of the inner cover 10 is passed through the guide pipe. 32, and the cooling liquid x guided from the cooling liquid supply device 60 through the cooling liquid guide pipe 61 is supplied to the first shower member 41 by the three-way valve 62. After cooling the outer surface of the inner cooling cover 21 by spraying the cooling liquid x from the upper part of the inner cooling cover 21 by the shower member 41 and cooling the inner cooling cover 21 in this way, The cooling liquid x is recovered in the cooling liquid recovery section 63 . In the drawing, the open portion of the three-way valve 62 is shown in white, and the closed portion is shown in black.

In this way, the outside air sucked through the outside air introduction portion 23 by the suction fan 31 is caused to flow between the inner cover 10 and the inner cooling cover 21 to cool the hot inner cover 10 and the first shower member 41 . By spraying the cooling liquid x from the upper part of the inner cooling cover 21 to cool the outer surface of the inner cooling cover 21, the inner cooling cover 21 is quickly cooled by the cooling liquid x, and the inner cooling cover 21 is quickly cooled by the cooling liquid x. The temperature difference between the cover 21 and the inner cover 10 increases, and radiative cooling from the inner cover 10 is promoted. is removed, the inner cover 10 can be efficiently cooled by the outside air.

Next, the inner cover 10 is cooled in this way, and when the temperature of the inner cover 10 is slowly cooled to a temperature that will not be damaged even if the cooling liquid x is directly sprayed, as shown in FIG. 2(B). The outside air sucked between the inner cover 10 and the inner cooling cover 21 by the suction fan 31 as described above flows between the inner cover 10 and the inner cooling cover 21 to cool the inner cover 10. , the cooling liquid x guided from the cooling liquid supply device 60 through the cooling liquid guide pipe 61 is switched from the first shower member 41 to the second shower member 51 by the three-way valve 62, and the second shower member 51 , and the cooling liquid x from the second shower member 51 is sprayed from the upper part of the inner cover 10 cooled to the predetermined temperature as described above, and the outer surface of the inner cover 10 is directly cooled by this cooling liquid x. , the processing material W in the inner cover 10 is cooled to a predetermined temperature, and the cooling liquid x after cooling the inner cover 10 in this manner is recovered in the cooling liquid recovery section 63. to

In this way, the inner cover 10 can be gradually cooled in a short time to a temperature at which the cooling liquid x is not damaged even if the cooling liquid x is directly sprayed on the outer surface of the inner cover 10. After the cooling liquid x is cooled to a predetermined temperature to the extent that it will not be damaged even if it is directly sprayed, the cooling liquid x is sprayed on the outer surface of the inner cover 10 from the second shower member 51 to remove the processing material W inside the inner cover 10. Since the inner cover 10 is cooled, a load is prevented from being applied to the inner cover 10 due to a temperature difference with the cooling liquid x, and local deformation and cracking of the inner cover 10 do not occur. The processing material W in 10 can be efficiently cooled to the target temperature in a short time.

Here, in the above-described embodiment, as the first cooling liquid spraying means 40, the first shower member 41 for spraying the cooling liquid x is provided in the upper central portion of the inner cooling cover 21 as described above. However, the first cooling liquid spraying means 40 is not limited to this.

For example, in a first modification in which the first cooling liquid spraying means 40 is changed, as shown in FIG. I am trying to set it up.

In this first modified example, the suction fan 31 is rotated as described above to suck the outside air between the inner cover 10 and the inner cooling cover 21 through the outside air introduction portion 23, and the outside air is flows between the inner cover 10 and the inner cooling cover 21 to cool the high-temperature inner cover 10, and the heated outside air is exhausted to the outside through the guide pipe 32, and from the cooling liquid supply device 60 The cooling liquid x guided through the cooling liquid guide pipe 61 is supplied to the ring-shaped first shower member 42 by the three-way valve 62 , and the cooling liquid x is supplied to the inner cooling cover 21 by the first shower member 42 . Spray from the top in a ring shape.

In addition, in the second modification in which the first cooling liquid spraying means 40 is changed, as shown in FIG. A ring-shaped first shower member 43 is provided between them.

In the second modification, the suction fan 31 is rotated as described above to suck the outside air between the inner cover 10 and the inner cooling cover 21 through the outside air introduction portion 23, and the outside air is is flowed between the inner cover 10 and the inner cooling cover 21 to cool the high-temperature inner cover 10, and the heated outside air is discharged to the outside through the guide pipe 32, and the cooling The cooling liquid x guided from the liquid supply device 60 through the cooling liquid guide pipe 61 is supplied to the ring-shaped first shower member 43 by the three-way valve 62. The first shower member 43 causes the cooling liquid x to flow inside. It is distributed in a ring shape along the outer periphery of the upper part of the cooling cover 21. - 特許庁

Further, in the above-described embodiment, a suction fan 31 is provided on the outer peripheral side of the upper portion of the outer cooling cover 22 as the cooling gas guide means 30 for causing outside air to pass between the inner cover 10 and the inner cooling cover 21. In addition, a guide pipe 32 is provided to guide outside air heated between the inner cover 10 and the inner cooling cover 21 to the outside via the suction fan 31. The cooling gas guide means 30 is It is not limited to such things.

For example, in a fourth modification in which the cooling gas guide means 30 is changed, as shown in FIG. is provided in the upper central portion of the inner cooling cover 21 under the suction fan 33, and the outside air heated between the inner cover 10 and the inner cooling cover 21 is sucked by the suction fan 33 to the outside. The first cooling liquid spraying means 40 is formed in a ring shape in the upper central part of the inner cooling cover 21 as in the first modification shown in FIG. A first shower member 42 is provided so as to be positioned on the outer peripheral side of the guide portion 21a.

In the fourth modification, the suction fan 33 is rotated to suck outside air between the inner cover 10 and the inner cooling cover 21 through the outside air introduction portion 23, and the outside air is drawn into the inner cover 10. and the inner cooling cover 21 to cool the high-temperature inner cover 10, and the heated outside air is directed to the outside through the guide portion 21a in the upper central portion of the inner cooling cover 21 under the suction fan 33. At the same time, the cooling liquid x guided from the cooling liquid supply device 60 through the cooling liquid guide pipe 61 is supplied to the ring-shaped first shower member 42 by the three-way valve 62, and this first shower member 42 , the cooling liquid x is spread in a ring shape along the outer circumference of the upper portion of the inner cooling cover 21 .

In addition, in a fifth modification in which the cooling gas guide means 30 is changed, as shown in FIG. A blowing pipe 35 is provided for sending outside air between the inner cover 10 and the inner cooling cover 21 by means of the blowing fan 34. A guide portion 21a is provided to guide the outside air heated between the gaps to the outside, and the first cooling liquid spraying means 40 is provided above the inner cooling cover 21 as in the first modification shown in FIG. A ring-shaped first shower member 42 is provided in the central portion so as to be positioned on the outer peripheral side of the guide portion 21a.

In the fifth modification, the blower fan 34 is rotated to blow the outside air between the inner cover 10 and the inner cooling cover 21 through the blower pipe 35. The hot inner cover 10 is cooled by flowing between the cooling cover 21, and the heated outside air is exhausted to the outside through the guide portion 21a in the upper central portion of the inner cooling cover 21, and the cooling liquid is supplied. The cooling liquid x guided from the device 60 through the cooling liquid guide pipe 61 is supplied to the ring-shaped first shower member 42 by the three-way valve 62, and the first shower member 42 supplies the cooling liquid x for inner cooling. It is distributed in a ring shape along the outer periphery of the upper part of the cover 21.例文帳に追加

In the above-described embodiment, an example in which the first shower members 41, 42, and 43 in the first cooling liquid spraying means 40 are changed is shown, but the second shower member in the second cooling liquid spraying means 50 51 can be changed in the same manner as the first shower members 41 , 42 and 43 in the first cooling liquid spraying means 40 .

Further, in Embodiment 1, the cooling cover 20 is provided with the inner cooling cover 21 and the outer cooling cover 22 whose top is open. It functions as a safety cover to prevent high-temperature splashes and water vapor from diffusing around the device when the cooling liquid x sprayed on the outer surface of the cover 21 flows down the outer surface of the inner cooling cover 21. As shown in FIG. As shown, the original function can be exhibited without providing the outer cooling cover 22 described above.

Further, in Embodiment 1, as shown in FIG. 8, the lower end of the outer cooling cover 22 can be extended to close the outside air introduction portion 23 in the lower portion of the outer cooling cover 22. As shown in FIG. In this way, when the suction fan 31 is rotated, outside air is sucked from the opened upper portion of the outer cooling cover 22, and the inner cover 10 is drawn through the outside air introducing portion 23 at the lower portion of the inner cooling cover 21. and the inner cooling cover 21, and flows between the inner cover 10 and the inner cooling cover 21, so that the inner cooling cover 21 is also cooled by the outside air from its outer peripheral side. and improve cooling efficiency.

Next, FIG. 9 is a graph comparing the state of temperature change of the heat-treated material W in the inner cover 10 between that of the present invention and that of the conventional example. Indicated. The solid line indicates the change due to the present invention, and the dotted line indicates the change due to the conventional example.

As a result, in the case of the present invention, the slow cooling time for slowly cooling the treated material W to a predetermined temperature is shortened by T1 compared to the conventional example, and accordingly, the treated material W is cooled to the desired temperature. The cooling time was T3 in the conventional example, whereas it was T2 in the present invention.

10 : Inner cover 20 : Cooling cover 21 : Inner cooling cover 21a : Guide part 22 : Outer cooling cover 23 : Outside air introduction part 30 : Cooling gas guide means 31 : Suction fan 32 : Guide pipe 33 : Suction fan 34 : blower fan 35 : blower pipe 40 : first cooling liquid spraying means 41 : first shower member 42 : first shower member 43 : first shower member 50 : second cooling liquid spraying means 51 : second shower member 60 : cooling Liquid supply device 61: Coolant guide pipe 62: Three-way valve (switching means)
63: Cooling liquid recovery unit S: Spacer W: Treatment material x: Cooling liquid

Claims (5)

A cooling device for a bell-shaped furnace that cools a heat-treated material in an inner cover, wherein the outer cooling cover and the outer cooling cover are provided on the outer peripheral side of the inner cover containing the heat-treated material. cooling gas guide means for flowing cooling gas through between said inner cover and said inner cooling cover; cooling on the outer surface of said inner cooling cover; A cooling device for a bell-type furnace, comprising: a first cooling liquid spraying means for spraying a liquid; and a second cooling liquid spraying means for spraying the cooling liquid on the outer surface of the inner cover. 2. The cooling apparatus for a bell-shaped furnace according to claim 1, wherein the cooling gas guide means sucks the cooling gas between the inner cover and the inner cooling cover, A cooling device for a bell-type furnace, comprising a suction fan for discharging cooling gas heated between the cover and the cover. 2. The cooling apparatus for a bell-shaped furnace according to claim 1, wherein the cooling gas guiding means is for blowing cooling gas between the inner cover and the inner cooling cover, A cooling device for a bell-type furnace, comprising a fan for exhausting cooling gas heated between the cover and the bell-shaped furnace. A cooling device for a bell-shaped furnace according to any one of claims 1 to 3, characterized in that the outer cooling cover in said double cooling cover is eliminated. . Using the cooling device for a bell-shaped furnace according to any one of claims 1 to 4, the cooling gas guide means causes the cooling gas to flow between the inner cover and the inner cooling cover. At the same time, the cooling liquid is sprayed from the first cooling liquid spraying means to the outer surface of the inner cooling cover to cool the inner cover to a predetermined temperature, and then the cooling liquid is sprayed from the second cooling liquid spraying means to the outer surface of the inner cover. A cooling method for a bell-shaped furnace, comprising the steps of: spraying a cooling liquid to cool a material to be treated in an inner cover;

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