JP2530750Y2 - Heater panel - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater panel used for heating the inside of an electric furnace, for example.

[0002]

2. Description of the Related Art For example, in order to heat the inside of an electric furnace for melting a metal, as shown in FIG. 3, a support plate 101 constituting an inner wall of the electric furnace, and one end of the inner surface of the support plate 101 are connected to other parts. A heater panel 104 made of a high-melting-point metal including an insulator 102 attached to the end and a heating wire 103 laid between one end and the other end of the support plate 101 via the insulator 102 is used. ing.

In such a heater panel 104, since the inner surface of the support plate 101 is flat, the heating wire 10
The distance between 3 and the inner surface of the support plate 101 was small. Therefore, the heating wire 103 is vibrated by applying an alternating current to the heating wire 103 and the thermal expansion of the heating wire 104 is caused by the heating wire 10.
An insulating member 105 such as a pipe or rod made of alumina or the like is disposed between the heating wire 103 and the support plate 101 in order to prevent the short circuit accident from occurring due to the contact between the support plate 3 and the support plate 101.

[0004]

[Problems to be Solved by the Invention] Conventional Heater Panel 1
In No. 04, since the distance between the heating wire 103 and the support plate 101 is small, the heat energy radiated from the heating wire 103 is immediately reflected by the support plate 101 and the insulation between the heating wire 103 and the support plate 101 is reduced. The member 105 is heated to a temperature close to the heating wire 103.

In the case where the inside of the glass ceramic melting furnace is heated by the heater panel 104, the temperature of the heating wire 103 must be higher than the furnace temperature. In such a case, the insulating member 105 may lose its strength and bend due to gravity.

Further, the temperature of the insulator 102 also rises due to the heat reflected from the support plate 101 and heat conduction, so that the insulating ability is reduced, or the reactivity with the gas in the furnace increases, and the insulator 102 is melted. There was a problem.

A heat insulating material is disposed on the back surface of the support plate 101. If the distance between the heating wire 103 and the support plate 101 is small, the temperature on the back surface of the support plate 101 increases.
The life of the heat insulating material was also shortened.

[0008] Due to the above-described problems, the temperature rise in the furnace is conventionally restricted, and the insulator 102 and the insulating member 1
05 and the heat insulation material had to be replaced regularly in a short period of time.

An object of the present invention is to provide a heater panel which can solve the above-mentioned problems of the prior art with a simple configuration.

[0010]

The feature of the present invention is that a support plate, insulators attached to one end and the other end of the support plate, and one end of the support plate via the insulator are provided. In a heater panel including a heating wire bridged between the other end side, between the one end side and the other end side of the support plate,
The point is that it is recessed with respect to the mounting surface of the insulator.

[0011]

According to the structure of the present invention, the gap between one end and the other end of the support plate is recessed with respect to the mounting surface of the insulator. The distance between the heating wire and the support plate is increased by the depth of the dent as compared with the case where the inner surface of the support plate is flat.

The amount of heat reaching the support plate from the heating wire is proportional to the square of the distance between the heating wire and the support plate.
The amount of heat reaching the support plate decreases according to the depth of the depression.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

A heater panel 1 shown in FIG. 1 is used to raise the internal atmosphere of an electric furnace.
The electric furnace includes a support plate 2, an insulator 3, and a heating wire 4 constituting an inner wall of the electric furnace, and is made of a high melting point metal.

A plurality of the insulators 3 are attached to one end and the other end of the support plate 2 on the inner surface side of the electric furnace.

The heating wire 4 extends between one end and the other end of the support plate 2 via the insulator 3. That is, the heating wire 4 is introduced from the outer surface side of the support plate 2 to the inner surface side of the support plate via the introduction rings 5 and 6 provided at one end side of the support plate 2, and is connected to the insulator 3 at one end side. It is sequentially wound around the insulator 3 at the end, and the end is connected to a power source (not shown).

A space between one end and the other end of the support plate 2 is recessed with respect to the mounting surface 7 of the insulator 3. That is, the support plate 2 is a rectangular flat main body 2a.
An erecting portion 2b erecting from one end side and the other end side of the main body portion 2a toward the inside of the electric furnace, an attaching portion 2c projecting upward and downward in the drawing from the inner end of each erecting portion 2b, An extension 2d extends from the upper and lower ends of the portion 2c in the drawing to the outside of the electric furnace. Thus, the main body 2a between one end and the other end of the support plate 2 is recessed toward the outside of the electric furnace with respect to the mounting portion 2c forming the mounting surface 7 of the insulator 3. .

According to the above configuration, since the distance between the heating wire 4 and the main body 2a of the support plate 2 is larger than in the prior art, the degree of freedom of displacement of the heating wire 4 is large, and the thermal expansion of the heating wire 4 and the AC Even if there is vibration due to energization, there is no short circuit accident due to contact between the heating wire 4 and the support plate 2. This eliminates the need for a conventional insulating member between the support plate and the heating wire. Also,
Since the degree of freedom of displacement of the heating wire 4 is large, contact between the heating wires 4 is also prevented.

The heating wire 4 is connected to the main body 2a of the support plate 2.
The amount of heat reaching the main body 2a is reduced in proportion to the square of the distance between the mounting surface 7 and the main body 2a as compared with the conventional one. As a result, the temperature rise of the insulator 3 due to the heat reflected from the support plate 2 is reduced, and the insulation of the insulator 3 is prevented from being lowered. Can be prevented. As a result, the furnace temperature can be increased within the range permitted by the insulating ability of the insulator 3, and in actual results, the temperature could be increased by about 100 ° C. as compared with the conventional case.

Further, due to the temperature drop of the support plate 2 itself, the heat shrinkage of the heat insulating material disposed outside the support plate 2 is reduced, and the life is extended.

Further, by adopting the above configuration, the effective volume in the furnace does not decrease.

The amount of depression of the main body 2a with respect to the mounting portion 2c is suitably about 25 to 35 mm. This is because if the amount of the dent is too large, the temperature of the support plate 2 itself decreases, and the heat outflow from the furnace becomes excessive.

As a material of the support plate 2 and the heating wire 4, a high melting point metal such as molybdenum (Mo), tantalum (Ta), tungsten (W), niobium (Nb) can be used.

As shown in FIG. 2, the insulator 3 is formed by a pin 8 made of molybdenum, a tube 9 made of alumina, a ring 10 made of alumina, a pair of retainers 11, 13 made of alumina, and a piece 12 made of molybdenum. ing.

The pin 8 is screwed into the mounting portion 2c of the support plate 2. A tube 9 is inserted around the outer periphery of the pin 8. First, a ring 10 is inserted into this tube 9, then one retainer 11 is inserted, and then a piece 12
Is inserted, and then the retainer 13 is inserted. Further, a through hole 14 is formed in the pin 8, and by inserting a pin 15 made of molybdenum into the through hole, the retainers 11, 13, the bridge 12 and the ring 10 are prevented from coming off from the pin 8. .

A peripheral groove 12a is formed on the outer periphery of the piece 12, and the heating wire 4 is wound around the peripheral groove 12a.

As a result, the heating wire 4 is made of the conductor 1
2, and the piece 12 is supported by the tube 9 and the retainers 11, 13 which are insulators. The tube 9 and the retainers 11 and 13 are in surface contact with the piece 12.

According to the insulator 3, the tube 9 and the retainers 11 and 13, which are insulators, support the heating wires 4 via the bridges 12 which are conductors and make surface contact with the bridges 12. Accordingly, the insulators 11, 12, and 13 receive a load acting from the heating wire 4 in the entire surface contact with the piece 12, and the load is not locally increased, and deformation and breakage are prevented. ing.

[0029]

According to the present invention, since the distance between the heating wire and the support plate becomes longer than before, the contact between the heating wire and the support plate can be maintained even if there is thermal expansion of the heating wire or vibration due to AC current. Or short-circuit due to contact between the heating wires can be prevented, and an insulating member for preventing contact as in the related art can be eliminated.

Further, since the amount of heat reaching the support plate from the heating wire is reduced, functional deterioration or damage due to the rise in temperature of the insulator due to heat reflected from the support plate is prevented, and the heating temperature can be reduced within the range permitted by the insulation capacity of the insulator. Can be raised.

Further, the life of the heat insulating material disposed on the back surface of the insulator or the support plate is extended, and the labor for replacement work can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view of a heater panel according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the insulator of the heater panel according to the embodiment of the present invention.

FIG. 3 is a perspective view of a heater panel according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heater panel 2 Support plate 3 Insulator 4 Heating wire 7 Mounting surface

Claims (1)

(57) [Scope of request for utility model registration] 1. A support plate, an insulator attached to one end and the other end of the support plate, and a heating wire bridged between the one end and the other end of the support plate via the insulator. The heater panel according to claim 1, wherein a portion between one end and the other end of the support plate is recessed with respect to a mounting surface of the insulator.