JP6469030B2 - Carbon heater component connected ultra high temperature furnace - Google Patents

Description

  The present invention relates to a high temperature furnace used for heat treatment, and more particularly to a carbon heater structure-connected ultra-high temperature furnace formed by connecting a plurality of carbon heater structures to form a carbon heater.

Conventionally, a Tamman type heating furnace in which carbon is formed in a cylindrical shape and used as a resistance heating element has been proposed (for example, Patent Document 1).
This Tamman type heating furnace is widely used as a heat treatment furnace for industrial materials because of its relatively simple heating means.
When heating using this Tamman type heating furnace, electricity is passed through a resistance heating element formed of carbon in a cylindrical shape, and the object to be heated contained in the resistance heating element is generated by Joule heat generated. Heating and baking.

Japanese Patent No. 3287029

However, since carbon powder is a material that is difficult to solidify, it is difficult to produce a long cylindrical resistance heating element with carbon.
For this reason, it is difficult to secure a long heat zone in the conventional Tamman-type heating furnace, and it is not possible to continuously heat and bake the object to be heated, so it is not possible to efficiently heat and bake the non-heat-treated object in large quantities. There is a problem that.
An object of the present invention is to provide a continuous ultra-high temperature furnace capable of continuously heating and firing a heat-treated object in a large amount by being able to form a resistance heating element made of carbon for a long time. It is.

The present invention has been created in view of the above circumstances and has been created for the purpose of solving these problems. The invention of claim 1 includes a chamber and a plurality of cylinders disposed inside the chamber. A cylindrical carbon heater formed by connecting a carbon heater structure, and a connection ring connecting the carbon heater structure, and the connection ring supported by a heater support body fixed to the chamber It is characterized by that.
The invention of claim 2 is characterized in that a first screw is formed on the outer peripheral surface of the end of the carbon heater structure, and a second screw is formed on the inner peripheral surface of the connection ring .
The invention of claim 3 is characterized in that a carbon rail is disposed on the inner peripheral surface of the cylindrical carbon heater .

In the present invention, the cylindrical carbon heater is lengthened by connecting a plurality of carbon heater constituents to form a long heat zone, so that an object to be heated can be continuously heated and fired in large quantities. It has the effect.
Since the present invention forms a cylindrical carbon heater by connecting a plurality of carbon heater components, the temperature gradient in the furnace can be changed by changing the length and thickness of the carbon heater components constituting the cylindrical carbon heater. And has an excellent effect of being able to change the temperature environment.
The present invention has an excellent effect that a cylindrical carbon heater can be reliably supported in addition to the above-described excellent effect.
In addition to the above-mentioned excellent effects, the present invention has the excellent effect that the wear of the cylindrical carbon heater is prevented and the durability is improved and the furnace temperature can be increased to a high temperature of about 2,800 ° C. .

It is a schematic sectional drawing of the carbon heater structure connection type ultra high temperature furnace of an Example. It is a schematic plan view of the carbon heater structure connection type ultra high temperature furnace of an Example. It is a partial expanded sectional view of the carbon heater structure connection type ultra high temperature furnace of an Example. It is a partial side view of the cylindrical carbon heater of the carbon heater structure connection type ultra high temperature furnace of an Example. It is a partial schematic expanded sectional view of the cylindrical carbon heater of the carbon heater structural body connection type ultra high temperature furnace of an Example. It is a partially expanded schematic sectional drawing of the carbon heater structure connection type ultra high temperature furnace of an Example.

  1 to 6 show an embodiment of an ultrahigh temperature furnace connected to a carbon heater structure according to the present invention.

As shown in FIGS. 1 and 2, the chamber 12 of the carbon heater structure-connected ultra-high temperature furnace 10 is made of steel and is formed in a horizontally long cylindrical shape.

As shown in FIG. 3, a heat insulating material containing cylindrical case 14 is disposed inside the chamber 12 concentrically with the chamber 12. A known heat insulating material 16 is accommodated between the outer peripheral portion 14 </ b> A and the inner peripheral portion 14 </ b> B of the heat insulating material accommodating cylindrical case 14.

A positioning tool 18 is provided between the lower portion of the inner peripheral portion 12 </ b> A of the chamber 12 and the lower portion of the outer peripheral portion 14 </ b> A of the heat insulating material containing cylindrical case 14. Thereby, the chamber 12 and the heat insulating material accommodation cylindrical case 14 are positioned concentrically, and at the same time, a gap is provided between the chamber 12 and the heat insulating material accommodation cylindrical case 14.

A cylindrical carbon heater 20 as a resistance heating element is disposed concentrically with the heat insulating material accommodation cylindrical case 14 inside the heat insulation material accommodation cylindrical case 14.

As shown in FIG. 4, the cylindrical carbon heater 20 is formed by connecting a plurality of carbon heater constituent bodies 22 formed of carbon (carbon) into a cylindrical shape. These carbon heater components 22 are connected by a carbon connection ring 24.
The cylindrical carbon heater 20 can be made long because it is formed by connecting a plurality of carbon heater structural bodies 22, but the length dimension is usually 6 m to 10 m and the diameter dimension is 20 cm to 30 cm.

As shown in FIG. 5, male screws 26 as first screws are formed on the outer peripheral surfaces of both ends of the carbon heater structure 22.
A female screw 28 as a second screw is formed on the inner peripheral surface of the connection ring 24 so that the male screw 26 of the carbon heater structure 22 can be screwed therein.

Therefore, as shown in FIG. 4, a cylindrical carbon heater 20 is formed by connecting a plurality of carbon heater structural bodies 22 via the connection ring 24.

  Further, since the cylindrical carbon heater 20 is configured by connecting a plurality of carbon heater structural bodies 22, the carbon heater structural body 22 having a different length dimension L (see FIG. 4) and a thickness dimension T (see FIG. 5). Can be attached. Since the electrical resistance is inversely proportional to the length of the carbon heater structure 22 and proportional to the cross-sectional area of the carbon heater structure 22, by connecting the carbon heater structures 22 having different length dimensions L and wall thickness dimensions T, The temperature gradient of the cylindrical carbon heater 20 can be easily created.

As shown in FIG. 3, a carbon rail 30 having a circular arc cross section is disposed on the bottom surface of the cylindrical carbon heater 20. The carbon rail 30 is made of carbon, and a carbon container 32 made of carbon containing a heat-treated object (not shown) and having a tea cylinder shape is placed on the carbon rail 30.

Even if the carbon container 32 is slid by placing the carbon rail 30 on the inner peripheral surface of the cylindrical carbon heater 20, the sliding carbon container 32 and the cylindrical carbon heater 20 do not come into contact with each other. It is possible to prevent the cylindrical carbon heater 20 from being worn by the slide.

In FIG. 3, the bottom surface of the carbon rail 30 and the inner peripheral surface of the cylindrical carbon heater structure 22 appear to be in surface contact with each other. However, both the carbon rail 30 and the carbon heater structure 22 are somewhat in contact with each other. Since there is distortion, the bottom surface of the carbon rail 30 and the inner peripheral surface of the cylindrical carbon heater structure 22 are in a point contact state.
For this reason, the contact area of the carbon rail 30 and the carbon heater structure 22 is small.

As shown in FIGS. 4 and 5, a heater support body 34 made of round bar-like carbon is disposed below the connection ring 24. The upper surface of the heater support body 34 abuts on the connection ring 24 to support the connection ring 24.

As shown in FIG. 3, the heater support body 34 is supported and fixed to an alumina heater support body holder 36 fixed to the chamber 12 with appropriate members.
Therefore, even if a plurality of carbon heater structural bodies 22 are connected to increase the length of the cylindrical carbon heater 20 and the weight of the cylindrical carbon heater 20 increases, the cylindrical carbon heater 20 may be broken or dropped. It is not to do.

The heater support body 34 is electrically insulated by being supported by a heater support body holder 36 made of alumina.

As shown in FIG. 6, gas curtains 40 are respectively provided at the inlet portion which is one end portion and the outlet portion which is the other end portion of the cylindrical carbon heater 20 (in FIG. 6, the gas on the outlet side is provided). Only the curtain 40 is shown). Thereby, it has the structure which can prevent that the air which causes the cylindrical carbon heater 20, the carbon rail 30, etc. to oxidize enter an inside.

As shown in FIGS. 1 and 2, a cylindrical inlet side cylindrical body 42 is connected to one end side of the chamber 12, and a cylindrical outlet side cylindrical body 44 is connected to the other end side.
Opening / closing doors 46 are respectively provided at the inlet portion of the inlet side cylindrical body 42 and the outlet portion of the cylindrical outlet side cylindrical body 44.

The chamber 12 is held on a base 50.

A power supply control box 56 and a heater transformer 58 are installed near the chamber 12.

As shown in FIG. 2, one end of the first lead wire 60 and one end of the second lead wire 62 are connected to the power control box 56. The other end portion of the first lead wire 60 is connected to one end portion of the cylindrical carbon heater 20, and the other end portion of the second lead wire 62 is connected to the other end portion of the cylindrical carbon heater 20. .

As shown in FIG. 1, a pusher type insertion device 70 is installed in the vicinity of the inlet side of the carbon heater structural body connected ultra high temperature furnace 10. The pusher type insertion device 70 is provided with a pusher 72 so as to be slidable. The pusher 72 can insert the carbon container 32 in which the object to be heat-treated is continuously inserted into the cylindrical carbon heater 20 from the inlet side cylindrical body 46.

Further, a take-out device 74 is installed in the vicinity of the outlet side of the carbon heater structure-connected ultrahigh temperature furnace 10. The take-out device 74 can take out the carbon container 32 in which the object to be heat-treated by the cylindrical carbon heater 20 is accommodated.

As shown in FIG. 2, a vacuum rotary pump 76 is installed near the chamber 12. This vacuum rotary pump 76 is a device for making the inside of the cylindrical carbon heater 20 into a vacuum state.

  The operation of the carbon heater structure connection type ultra high temperature furnace 10 of the embodiment will be described below.

First, the vacuum rotary pump 76 is used to prepare the inside of the cylindrical carbon heater 20 in a vacuum state as a pre-startup preparation of the carbon heater structural body connected ultra high temperature furnace 10.

Next, the openable doors 46 and 46 of the carbon heater structure-connected ultra-high temperature furnace 10 are closed, the carbon heater structure-connected ultra-high temperature furnace 10 is started, and the temperature in the cylindrical carbon heater 20 is raised.

When the temperature raising operation in the cylindrical carbon heater 20 is finished, an appropriate gas flow rate is adjusted, the openable door 46 is opened, and the carbon container 32 in which the object to be heated is stored is continuously provided by the pusher 72 of the pusher type insertion device 70. Then, it is inserted into the cylindrical carbon heater 20 from the inlet side cylindrical body 46.

The carbon container 32 containing the object to be heated inserted into the cylindrical carbon heater 20 slides on the carbon race 30 and slides toward the outlet side of the chamber 12 and is taken out by the take-out device 74.

  Accordingly, the heat-treated material accommodated in the carbon container 32 is heated and baked in a long heat zone and heated and baked in large quantities, so that the work efficiency of the heating and baking can be further improved.

Further, since the cylindrical carbon heater 20 is securely supported by the heater support body 34, the cylindrical carbon heater 20 is broken even if the length of the cylindrical carbon heater 20 is increased and the weight is increased. Can be prevented from falling or falling.

  Since the carbon heater structure 22 of the cylindrical carbon heater 20 is replaceable, the temperature environment in the furnace is changed by the operator's intention by replacing the carbon heater structure 22 with a different length dimension L or wall thickness dimension T. It can be changed to the temperature environment to be heated, and the heating and baking treatment corresponding to the property of the object to be heated and the intended use can be performed.

  Furthermore, since the carbon rail 30 is disposed inside the cylindrical carbon heater 20, the sliding carbon container 32 does not directly contact the carbon heater 20, so that the cylindrical carbon heater 20 can be prevented from being worn. Thereby, durability of the cylindrical carbon heater 20 can be improved.

In addition, since the cylindrical carbon heater 20 and the carbon rail 30 are in direct contact with each other, it is divided into a current flowing through the cylindrical carbon heater 20 and a current flowing through the carbon rail 30 and the carbon container 32. Is a point contact, the contact area is small, and a large effect is obtained by increasing the ratio of the resistance value of the cylindrical carbon heater 20 and the resistance value of the carbon rail 30 (reducing the resistance value of the cylindrical carbon heater 20). There is no such thing. Thereby, the continuous heating and baking process at high temperature are attained.

In the embodiment, a male screw 26 as a first screw is formed on the outer peripheral surface of the end portion of the carbon heater structure 22, and a female screw 28 as a second screw is formed on the inner peripheral surface of the connection ring 24. However, a female screw 28 is formed on the inner peripheral surface of the end of the carbon heater structure 22, and a male screw 26 is formed on the outer peripheral surface of the connection ring 24, so that a plurality of carbon heater structures are formed via the connection ring 24. The body 22 may be connected.

Conventionally, boron nitride (BN) or the like has been used as a high-temperature insulating material so that the heater and the container do not come into direct contact with each other. By using it, it can be used even at an ultra-high temperature of about 2,800 ° C.

In addition, since the carbon heater structure-connected ultra-high temperature furnace 10 of the present invention has the above-described configuration, the internal temperature of the cylindrical carbon heater 20 can be used up to about 2,900 ° C. with argon gas which is an inert gas. is there.

DESCRIPTION OF SYMBOLS 10 Carbon heater structure connection type ultra high temperature furnace 12 Chamber 14 Heat insulation material accommodation cylindrical case 16 Heat insulation material 18 Positioning tool 20 Cylindrical carbon heater 22 Carbon heater structure 24 Connection ring 26 Male screw 28 Female screw 30 Carbon rail 32 Carbon container 34 Heater Support Body 36 Heater Support Body Holder 40 Gas Curtain 42 Entrance Side Cylindrical Body 44 Exit Side Cylindrical Body 46 Openable Door 50 Base 56 Power Control Box 58 Heater Transformer 60 First Lead Wire 62 Second Lead Wire 70 Pusher Type Insertion device 72 Pusher 74 Extraction device 76 Vacuum rotary pump

Claims (3)

A chamber, a cylindrical carbon heater disposed inside the chamber and connected to a plurality of cylindrical carbon heater components, and a connection ring for connecting the carbon heater components; An ultra-high temperature furnace connected to a carbon heater structure, wherein the connection ring is supported by a heater support body fixed to the chamber . 2. The carbon heater structure-connected ultra-high temperature according to claim 1, wherein a first screw is formed on an outer peripheral surface of the end portion of the carbon heater structure, and a second screw is formed on an inner peripheral surface of the connection ring. Furnace. The carbon heater structure-connected super-high temperature furnace according to any one of claims 1 and 2, wherein a carbon rail is disposed on an inner peripheral surface of the cylindrical carbon heater .

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