JPH045990Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a concentric columnar heating furnace having a heated object passage in the center.

[Conventional Apparatus and Problems] FIG. 3 shows a conventional concentric columnar heating furnace having a through hole for the heated body in the center. In the figure, 9 indicates a linear heated body. As shown in the figure, a doughnut-shaped upper insulating material 4 made of carbon, for example, is provided so as to concentrically surround the heated body 9, has a through hole in the center of the bottom, and is joined to the upper insulating material 4 at the top, for example. A cylindrical carbon heater 6 is arranged in a heat insulating part E made of a cylindrical lower heat insulating material 5 made of carbon, and a cylindrical casing body 1 made of stainless steel, for example, is connected to the outside of the heat insulating part E. It is surrounded by a casing F consisting of an upper lid 2 and a lower lid 3 having holes.

A gas flow path 15 is formed in the upper lid 2 and the lower lid 3 so that the gas flows through the circumference inside the lid, connected to the N ₂ gas supply port A from the outside.
Open grooves 16 are provided inside the upper lid 2 and lower lid 3 so that gas is uniformly supplied.

Insulation part E, casing body 1, upper lid 2, lower lid 3
between the insulation part E and the carbon heater 6,
A gap is created between the heated body 9, the upper cover 2, the lower cover 3, and the carbon heater 6.

As mentioned above, the inside of the casing is mostly composed of carbon materials such as the upper insulating material 4, the lower insulating material 5, and the carbon heater 6, but this heating furnace supplies power to the carbon heater 6 and By keeping it heated to a high temperature, carbon
Since the heater 6 is used at a high temperature while passing the heated object 9 through its center, it is necessary to replace the inside of the device with N ₂ gas, and N ₂ gas is supplied from the upper and lower gas supply ports A. This N ₂ gas is discharged through a passageway of the heated body 9 provided in the center of the upper lid 1 as an exhaust port B. Note that 7 is a heated object fixing plate made of aluminum, for example, which is held on the upper lid 2, and 8 is a heated object fixing plate that is held on the upper lid 2.
This is a heated object fixing plate made of, for example, dovetails and held on the outside of the heated body.

As shown in the figure, this device has _N2 gas supply ports A at two locations, upper and lower, and has a structure in which the flow path 15 is divided within the upper lid 2 and lower lid 3.
The _N2 gas passes through the flow path 15, and then flows through the uniform open groove 1 on the lid surface.
6, the gas flow path is made to reach the exhaust port B through each gap, but in reality, the gas flow path is not clear, and there are parts where the inside of the device is not sufficiently replaced with N ₂ gas, which may cause damage to the device. However, since the gas flow path is not clear, there is a drawback that appropriate countermeasures cannot be taken.

[Purpose/Structure of the invention] As mentioned above, the invention has the following advantages:
There are N ₂ gas supply ports at the top and bottom, and the actual N ₂ gas flow path is not clear, so we installed N ₂ gas between the casing and the insulation part and all over the carbon heater using one supply port. The purpose is to replace the gas flow path with a ring or a ring and a guide to prevent damage from occurring, and the gas flow path is separated by the ring or guide. It is configured to allow N ₂ gas to flow by providing a

The present invention will be explained below with reference to embodiments shown in the drawings. In the figure, the same parts as in FIG. 3 are designated by the same reference numerals.

FIG. 1 shows an embodiment of the present invention in sectional view, and FIG.
The figure shows, in a partially cutaway view, an embodiment of the arrangement delimited by a ring and a guide.

As shown in FIG. 1, for example, a cylindrical upper insulating material 4, both made of carbon and having a through hole for the heated material and having a similar through hole at the center of the bottom and joined to the upper insulating material 4 at the top, is made of carbon. A cylindrical carbon heater 6 is arranged inside the heat insulating part E made of the lower heat insulating material 5 with a gap between the heat insulating part E and the heat insulating part E.
The outside is surrounded by a casing F consisting of a cylindrical casing body 1 made of, for example, stainless steel, an upper cover 2 and a lower cover 3 having a through hole in the center.

It is assumed that the casing F, the upper and lower through holes of the heat insulating part E, and the carbon heater 6 are located concentrically.

The N ₂ gas supply port C is provided at a position offset from the center of the lower lid 2. Around the through hole provided in the center of the lower cover 3 and the through hole provided in the center of the bottom of the lower insulating material 5, N ₂ gas mainly flows from the gap formed by the bottom of the lower insulating material 5 and the lower cover 3. A ring 10 is placed to seal the flow of _N2 gas to prevent leakage. The ring 10 is preferably made of glass. In this way, if the gap at the bottom is sealed with the ring 10, the _N2 gas will pass through the gap between the insulation part E and the casing F from the gas supply port C provided in the lower lid 3, and then from the hole in the insulation part E at the top. The gas enters the inside and descends, replacing the inside and outside surfaces of the carbon heater 6 inside with N ₂ gas, and is discharged through the hole in the lower lid 3 as the discharge port D.

In the embodiment shown in FIG. 2, as in the embodiment shown in FIG.
A ring 10 is inserted into the gap formed by the lower cover 3 and the lower cover 3.
is provided.

Guides 11a and 11b are preferably made of glass. The guide 11a seals the gap between the heat insulating part E and the casing body 1 and extends vertically in a straight line from the lower end to the upper end of the heat insulating part, and the guide 11b seals the gap and surrounds the outer periphery of the heat insulating part E. It extends in a ring shape. Guide 11
b is in contact with the lower end of the guide 11a, and as shown in the figure, the guide 11b goes around the heat insulating part E in a counterclockwise direction, leaving a notch 12 in front of the guide 11a, and ends at the top of this notch 12. The guide 11 is in contact with the guide 11a at the middle of the heat insulating part E.
b rotates around in the clockwise direction, leaving a chipped part 13 in front of the guide 11a, and then touches the guide 11a at the top of the chipped part 13 and the upper end of the heat insulating part E, and the guide 11b goes around in the clockwise direction. Thus, the cutout 14 is left in front of the guide 11a. Therefore, in the state where the flow path is formed, N ₂ gas enters the lower side of the insulation part E from the gas supply port C, and passes through the flow path separated by the guides 11a and 11b as shown by the arrow. , flows from the upper part of the heat insulating part E to the inner and outer surfaces of the carbon heater 6 inside the heat insulating part E, and is discharged through the gas outlet D through the hole in the lower cover 3.

In the embodiment described above, the guide 11b is provided in three stages, but it is also possible to provide three or more stages to further increase the number of stages.

Further, it is preferable that the carbon heater 6 is installed at a position exceeding 50% of the distance between the gas supply port and the gas discharge port from the gas supply port. This allows the N ₂ gas to be sufficiently preheated to reduce thermal energy loss in the carbon heater section.

[Effects] This invention has only one _N2 gas supply port and one discharge port, so there is sufficient supply inside the furnace.
_N2 gas replacement is possible.

Since the _N2 gas flow path is provided from the outside to the inside of the carbon material, the gas is preheated before it comes into contact with the carbon heater, minimizing thermal energy loss in the carbon heater. can.

By spreading the N ₂ gas along the guide throughout the furnace, it can be replaced with a small amount of gas flow, which has a large economic effect.

[Brief explanation of the drawing]

FIG. 1 shows a cross-sectional view of an embodiment of the invention. Second
The figure shows another embodiment of the invention in a partially cutaway view. FIG. 3 shows a conventional concentric columnar heating furnace. DESCRIPTION OF SYMBOLS 1...Casing body, 2...Upper lid, 3...Lower cover, 4...Upper insulation material, 5...Lower insulation material, 6...
... Carbon heater, 7, 8 ... Heated object fixing plate, 9 ... Heated object, 10 ... Ring, 11a,
11b...Guide.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A cylindrical carbon heater, a heat insulating part surrounding the cylindrical carbon heater leaving a through hole for the heated material, and surrounding the heat insulating part,
In a concentric columnar heating furnace formed of a casing having holes for the material to be heated at the top and bottom so that the material to be heated passes from outside the furnace to the inside of the cylindrical carbon heater, the bottom of the heat insulating section and the bottom cover of the casing The gap formed by the above is sealed with a ring, and the gap formed between the heat insulating part and the casing and the inside of the heat insulating part are used as an _N2 gas flow path,
A concentric columnar heating furnace configured to supply N ₂ gas from a gas supply port provided at a position offset from the center of the lower lid, and to discharge the gas from a through hole for the material to be heated in the lower lid. (2) The heating furnace according to claim 1 of the utility model registration claim, which includes a gas flow path separated by a guide.