JP2001235288A - Heat insulated wall structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a heat insulation member from being deteriorated and prolong the use life without lowering heat insulation performance at an anchoring position of the heat insulation member and a lining member. SOLUTION: On the inside of a furnace of a heat insulation member 12 a lining member 44 is disposed to cover a surface layer part of the heat insulation member 12. The lining member 44 is positioned and anchored to the heat insulation member 12 through a plurality of stopper pins 46. Each stopper pin 46 is formed with a base 48 extending up and down, and a pair of engagement and protrusion parts 50, 50 formed on upper and lower ends of the base 48. On the tip ends of the engagement/protrusion portions 50 arrow shaped engagement pieces 50a engageable with the heat insulation member 12 are formed. By inserting the stopper pin 46 into the heat insulation member 12 from the side of the lining member 44 the respective engagement piece 50a, 50a are engaged in the heat insulation member 12, whereby the lining member 44 is positioned and anchored to the heat insulation member 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heat insulating wall structure, and more particularly to a heat insulating wall structure in which a lining material is positioned and fixed inside a furnace of a heat insulating material by using a stopper.

[0002]

2. Description of the Related Art In vacuum furnaces and the like used for powder sintering of various alloy products and firing of ceramic products, for example, from the viewpoint of energy saving, a processing chamber is provided inside a heat insulating wall made of a heat insulating material made of carbon fiber. The heat treatment is performed on the processed product that has been defined and charged in the processing chamber.

[0003] Although the heat insulating material made of carbon fiber is excellent in heat insulating properties, it has low self-strength, and the surface layer inside the furnace is powdered with time, and a part of the fiber is peeled off. . Therefore, it is pointed out that if this is left as it is, the heat insulating performance of the above-mentioned powdered portion or the peeled portion is reduced and the service life of the heat insulating material is shortened. In addition, when the fiber pieces that have fallen off from the heat insulating material fall onto the processed product, traces are left on the processed product due to the carburizing action, causing a problem that the product quality is significantly reduced. Further, in a vacuum furnace, the heat insulating material is directly exposed to the evaporant from the processed product, and the heat insulating material may react and deteriorate.

Therefore, conventionally, as shown in FIG. 4 or 5, a heat insulating material 12 attached to a holding material 10 located outside the furnace is used.
A protective plate 14 made of molybdenum or carbon
Molybdenum, carbon or ceramic bolts 1
6. By fixing using the nut 18 or the wire 20, the deterioration of the surface layer of the heat insulating material 12 is prevented, and the service life is extended.

[0005]

In the structure in which the protection plate 14 is fixed by using the bolts 16, the nuts 18, or the wires 20, as shown in FIGS. 4 and 5, the bolts 16 and the wires 20 are connected to the protection plate 14, and the heat insulation. Since it penetrates through the material 12 and the holding material 10, heat is radiated through the bolts 16 and the wires 20, and it is pointed out that the heat insulation performance at the fixing portion is deteriorated. Further, there is a disadvantage that the metal holding member 10 is damaged by the heat transmitted through the bolt 16 and the wire 20 and the service life is shortened. Furthermore, bolts 16 and nuts 18
It is necessary to perform the fixing work with the wire 20 and the inside and outside of the heat insulating wall, which is a time-consuming and complicated work.

It is proposed that a carbon sheet having a high self-strength be baked on the inside of a furnace of a heat insulating material with an adhesive material or the like without using fixing members such as the bolts 16 and the wires 20. However, in this case, when the treated product comes into contact with the carbon sheet during the loading or unloading operation of the treated product, and the carbon sheet is peeled or damaged, there is a problem that the repair becomes large-scale and the cost increases. I have.

[0007]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above-mentioned problems inherent in the prior art, and has been proposed in order to solve the problem suitably. An object of the present invention is to provide a heat-insulating wall structure that can prevent deterioration of a heat-insulating material and can prolong the service life thereof without lowering the heat-insulating performance, and can easily fix a lining material.

[0008]

[MEANS FOR SOLVING THE PROBLEMS]
In order to appropriately achieve the intended purpose, the heat insulating wall structure according to the present invention is configured such that a lining material is arranged inside the furnace of the heat insulating material, a stopper is inserted into the heat insulating material from the lining material side, and the stopper is formed. The lining material is fixed to the heat insulating material by locking the engaging projection in the heat insulating material.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a heat insulating wall structure according to the present invention. It is to be noted that the same members as those described in the related art with reference to FIGS. 4 and 5 are denoted by the same reference numerals.

FIGS. 1 and 2 show a heat insulating wall structure according to an embodiment, and FIG. 3 shows a schematic structure of a vacuum furnace employing the heat insulating wall structure. Inside the vacuum chamber 32 of the vacuum furnace 30, a heat insulating wall 34 formed in a box shape by arranging a heat insulating material 12 made of carbon fiber on a holding material 10 made of a metal material such as molybdenum. Is accommodated, and a processing chamber 36 is defined by being surrounded by the heat insulating wall 34. This processing chamber 36
A mounting table 40 on which a processing product 38 is mounted is disposed inside the processing chamber 3, and the processing product 38 mounted on the mounting table 40 is placed in the processing chamber 3.
6 is set so as to face substantially the center. Further, a vacuum pump (not shown) is connected to the vacuum chamber 32, and the inside of the vacuum chamber 32 and the processing chamber 36 can be set to a substantially vacuum atmosphere.

A vacuum chamber 32 is provided in the vacuum furnace 30.
And a plurality of combustion-type radiant tube heaters 42 penetrating through the heat insulating wall 34 and facing the inside of the processing chamber 36, respectively, in the vertical direction along the furnace wall so as to reach between the heat insulating wall 34 and the processing product 38. It is arranged to extend. That is,
In the vacuum furnace 30, the processing product 38 charged in the processing chamber 36 is
Is heated by a plurality of radiant tube heaters 42.

A flat lining material 44 is disposed inside the furnace of the heat insulating material 12 in the heat insulating wall 34 so as to cover a surface layer portion of the heat insulating material 12, and the heat insulating material 12 is separated from the processed product 38 by the lining material 44. It is configured to prevent direct exposure to the evaporant and to prevent a piece of fiber peeling off from the heat insulating material 12 from falling onto the processed product. As the lining material 44, a carbon-based material having high heat resistance can be preferably used. In this embodiment, the lining material 44 is formed using a carbon-carbon composite material having high heat resistance and high self-strength. Lock pin 4 as
It is positioned and fixed to the heat insulating material 12 via 6.

As shown in FIG. 2, the stopper pin 46 has a base 48 extending vertically and a pair of engaging projections 50 formed at the upper and lower ends of the base 48 and extending horizontally in the same direction. ,
50 and a substantially U-shape. In addition, each engagement protrusion 50
Are formed with arrowhead-shaped engaging pieces 50a that can be locked to the heat insulating material 12, respectively. The retaining pin 46 is formed of the same carbon / carbon composite material as the lining material 44 so as to withstand use at a high temperature in the furnace.

Each of the locking pins 4
6, through holes 44 a, 44 a corresponding to the pair of engagement protrusions 50, 50 are formed in the fixing portion. In addition, an auxiliary plate 52 formed with through holes 52a, 52a corresponding to the pair of engagement protrusions 50, 50 is attached to the fixing portion, and the stop pin 46 connects the engagement protrusions 50, 50 to each other. Auxiliary plate 52
Through holes 52a, 52a and through holes 4 of the lining material 44
The lining material 44 is positioned and fixed to the heat insulating material 12 by being inserted into the furnace material 4a, 44a from the furnace inner side (lining material side), and the engaging pieces 50a, 50a being locked in the heat insulating material 12. . In addition, the engagement projection 50 of the locking pin 46
The length of the auxiliary plate 52 and the lining material 44
Is set to a value such that the tip does not protrude outside the furnace of the heat insulating material 12 when the heat insulating material 12 is inserted through the heat insulating material 12.

The carbon / carbon composite material forming the lining material 44 and the retaining pin 46 is obtained by impregnating a thermosetting resin into a cloth woven of carbon fibers and then thermosetting the carbon fiber. It is manufactured in a flat shape by processing, and while maintaining self-strength that can withstand use in the heat insulating wall 34,
It has the property that it can be cut off by a tool such as a cutter.

[0016]

Next, the operation of the heat insulating wall structure according to the embodiment will be described. Lining material 44 for the heat insulating material 12
When fixing the lining material 44 having a predetermined outer diameter
Is positioned in contact with the surface of the heat insulating material 12 inside the furnace. As shown in FIG. 1, the auxiliary plate 52 is brought into contact with the lining material 44 with the through holes 52a, 52a aligned with the pair of through holes 44a, 44a provided at the respective fixing portions of the lining material 44. Touch The two engaging projections 50, 50 of the retaining pin 46 are inserted into the through holes 52 of the auxiliary plate 52.
a, 52a and through holes 44a, 44a of the lining material 44
Into the heat insulating material 12 from inside the furnace through the base 4
8 is brought into contact with the auxiliary plate 52. Thereby, the heat insulating material 12
Pieces 50a, 50 of both engagement projections 50, 50 inserted into
is locked in the heat insulating material 12, and the lining material 44 is positioned and fixed to the heat insulating material 12. Since the fixing operation of the lining material 44 is merely performed by inserting the stopper pin 46 from the inside of the furnace, the fixing operation can be performed easily and in a short time. The number and positions of the fixing pins 46 for fixing the lining material 44 to the heat insulating material 12 are appropriately set according to the size and shape of the lining material 44.

In the vacuum furnace 30 employing the heat insulating wall 34 constructed as described above, since the inside of the heat insulating material 12 is covered with the lining material 44, the heat insulating material 12
Powdering and peeling due to the deterioration over time of the glass are suppressed. In addition, the fiber pieces peeled off from the heat insulating material 12 do not fall onto the processed product 38, so that the quality of the processed product 38 can be prevented from being deteriorated. Further, since the heat insulating material 12 is not directly exposed to the evaporant from the processing product 38, it is possible to suppress the heat insulating material 12 from reacting and deteriorating.

Further, the engaging projections 50 of the stop pin 46,
As shown in FIG. 1, 50 does not penetrate the heat insulating material 12 and does not protrude to the outside of the furnace. Moreover, since the retaining pin 46 is formed from carbon / carbon composite material, its thermal conductivity is low,
Heat loss at the fixation site can be significantly reduced. Incidentally, in the conventional technique shown in FIG.
In this case, the outside temperature (temperature on the holding material side) at the fixed portion was 600 ° C.
When was adopted, it was suppressed to 300 ° C. That is, it is possible to prevent the holding member 10 made of a metal material from being damaged by the thermal influence. The use of the auxiliary plate 52 improves the fixing strength of the stopper pin 46, but the auxiliary plate 52 can be omitted.

Since the lining material 44 can be cut out by a tool, if the processed product 38 comes into contact and the lining material 44 is cracked or chipped, only the damaged portion is cut off and another lining material 44 is cut off. It can be easily dealt with simply by fixing the 44 via the locking pin 46. If the lining material 44 fixed to the inner surface of the furnace of the heat insulating material 12 is finely divided, it is possible to cope with the problem by replacing only the lining material 44 at the damaged portion.

The shape of the stopper pin is not limited to the embodiment, and the number of the engaging projections is three or more, or various shapes such as T-shape and L-shape are adopted. It is possible that the engaging projections inserted into the heat insulating material have a shape that can be locked to the heat insulating material. When the auxiliary plate is omitted, a flange or the like can be formed on the stop pin in order to increase the contact area between the stop pin and the lining material. Further, in the embodiment, the case where the heat insulating wall structure is adopted in the vacuum furnace has been described, but it goes without saying that the heat insulating wall structure can be adopted in other types of furnaces.

[0021]

As described above, in the heat insulating wall structure according to the present invention, the lining material is positioned and fixed to the heat insulating material by the stoppers locked in the heat insulating material. Can be prevented and heat loss can be reduced. Further, since the stopper is merely inserted into the heat insulating material, the fixing work of the lining material can be performed in a short time, and the repair of the lining material can be easily performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part showing a heat insulating wall structure according to a preferred embodiment of the present invention.

FIG. 2 is a schematic perspective view of a main part showing a heat insulating wall structure according to an embodiment.

FIG. 3 is a schematic configuration diagram of a vacuum furnace according to an example.

FIG. 4 is a sectional view of a main part showing a heat insulating wall structure according to a conventional technique.

FIG. 5 is a cross-sectional view of a main part showing another heat insulating wall structure according to the related art.

[Explanation of symbols]

 12 Insulation Material 30 Vacuum Furnace 46 Stop Pin (Stop Tool) 44 Lining Material 50 Engagement Projection

Claims (4)

[Claims] 1. A lining material (44) inside a furnace of a heat insulating material (12).
Is inserted from the side of the lining material (44) into the heat insulating material (12), and the engaging projection (5) formed on the fastener (46) is inserted.
0) is locked in the heat insulating material (12), so that the lining material (4
A heat insulating wall structure, wherein 4) is fixed to a heat insulating material (12). 2. The heat insulating wall structure according to claim 1, which is used for a vacuum furnace (30). 3. The heat insulating wall structure according to claim 1, wherein the lining material is formed of a carbon-based material, and the stopper is formed of a carbon-carbon composite material. 4. The heat insulating wall structure according to claim 1, wherein said heat insulating material is made of fiber.