JP2010135256A - Vertical type heating furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems that an exothermic wire used for a conventional vertical type heating furnace has shortcomings of jumping out of its housing groove, drooping, and moreover that the vertical type heating furnace has its maintenance problem. <P>SOLUTION: A coil shaped heater consists of a ceramic rod, a ceramic wire wound and fixed to this ceramic rod in a spiral shape, a spiral groove formed between respective turns of this ceramic wire, and a coil shaped exothermic wire wound along this spiral groove. The vertical type heating furnace consists of a cylindrical furnace wall and a plurality of the coil shaped heaters vertically installed on this furnace wall inner face separated from each other in the circumferential direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a vertical heating furnace using a coiled heater, and more particularly to a vertical heating furnace using a coiled heater having a coiled heating wire without sagging.

  FIG. 3 shows a conventional heating furnace apparatus (Patent Document 1), in which 1 is a cylindrical ceramic fiber furnace wall such as an electric furnace, and 2 is circumferentially spaced apart from the inner peripheral surface of the furnace wall 1 in the vertical direction. The heating wire housing groove 3 is formed in a coil-shaped heating wire arranged in the heating wire housing groove 2, and 4 is a pedestal provided at the bottom of the furnace wall 1.

  In the above conventional heating furnace device, in order to prevent the heating wire 3 from jumping out of the heating wire storage groove 2 due to the heating expansion / contraction phenomenon of the heating wire 3 in the heating wire storage groove 2, the opening of the heating wire storage groove 2 is formed. A blocking portion 5 that can be sandwiched or a measure for preventing the heating wire from popping out has been provided.

  However, in an electric furnace in which a heating wire storage groove is provided in a cylindrical furnace wall and a coiled heater is stored therein, heat is accumulated in the heating wire storage groove when heating is prolonged, and the heating body becomes abnormal. There was a defect that caused temperature unevenness and adversely affected the heated object inside the furnace wall.

  In addition, as shown in FIG. 3, there is a drawback in that a heat dissipation loss increases because the heating element is placed in the storage groove. Furthermore, since the heating lines are arranged along the circumference in the furnace circumferential direction, the temperature distribution in the furnace circumferential direction is good, but the temperature distribution in the furnace vertical direction is disadvantageous.

  There is also a heating furnace in which a heater wire is wound around a heat-resistant support column and disposed inside a cylindrical furnace wall (Patent Document 2), but the heater wire hangs down due to expansion and contraction during heating, and makes contact with the adjacent heater wire. There was a risk of an accident.

In FIG. 4, reference numeral 6 denotes a heat-resistant material support, 7 a cooling air jet formed on the support 6, 8 an inner heater wound around the support 6, and 9 an outer heater formed on the furnace wall 1. .
Japanese Patent Laid-Open No. 9-280749 JP-A-8-181082

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a vertical heating furnace having little heat dissipation loss, easy maintenance, and stable characteristics over a long period of time.

The vertical heating furnace of the present invention comprises a cylindrical furnace wall and a plurality of coiled heaters arranged vertically on the inner surface of the furnace wall so as to be spaced apart from each other in the circumferential direction. the ceramic wire fixed spirally wrapped ceramic rod, and spiral grooves formed between each turn of the ceramic line, Ri more formed coiled heating wire wound along the spiral groove, the ceramic rods The coiled heater is spaced apart from the furnace wall by fixing it to the cylindrical furnace wall with a ceramic fixture .

  According to the coil heater of the present invention, the following effects can be obtained.

(1) Since a ceramic wire always intervenes between each turn of the coiled heating wire, the coil does not hang down during heating.

(2) By raising the helical height of the helical ceramic wire , it is possible to prevent the heating wire from jumping out during heating.

  (3) Since the coiled heating wire can be attached to the inner surface of the ceramic fiber furnace at a later distance from the furnace wall, the watt density can be freely set, and the degree of freedom in designing the electric furnace is remarkably improved.

  (4) Since the distance between the inner surface of the ceramic fiber furnace and the coiled heating wire can be set freely, the thermal efficiency of the object to be heated is improved.

(5) The vertical temperature distribution of the furnace can be remarkably improved by arranging the coil-shaped heating element in a vertical shape in the furnace, particularly in a long furnace.

(6) Maintenance of the heater is extremely easy because it is possible to cope with disconnection or partial malfunction of the heater by replacing the coiled heater at that location.

  Embodiments of the present invention will be described below with reference to the drawings.

In the present invention, as shown in FIG. 1, a ceramic wire 11 is spirally wound and fixed to a ceramic rod 10, and a coil-shaped heating wire 3 is formed along a spiral groove 12 formed between the turns of the ceramic wire 11. Is wound to form the coiled heater 13.

As shown in FIG. 2, a plurality of the above-mentioned coil-shaped heaters 13 are arranged on the inner surface of the ceramic fiber furnace wall 1 in the circumferential direction so as to be spaced apart from each other in the circumferential direction to constitute a vertical heating furnace 15.

According to the vertical heating furnace 15 of the present invention, since the heating wire 3 is wound with the spiral groove 12 as a guide, it does not hang down even when heated and contracted during use of the furnace. Increasing the height prevents the heating wire 3 from overcoming this.

Moreover, although the winding pitch of the heat generating wire 3 is shortened by shortening the helical pitch of the ceramic wire 11, since the ceramic wire 11 exists in the pitch, the turns of the adjacent heat generating wires 3 do not contact each other.

In addition, the watt density can be increased by densely arranging the heating wires 3 in the vertical direction on the inner surface of the furnace, and the ceramic rod 10 is separated from the furnace wall 1 by the ceramic rod fixture 14 to approach the object 5 to be heated. By doing so, the thermal efficiency can be dramatically increased.

In addition , the temperature distribution in the vertical direction of the furnace 1 can be remarkably improved, and the coil heaters 13 can be replaced individually, which facilitates maintenance.

It is a front view of the coil-shaped heater in the heating furnace apparatus of this invention. It is a top view of the vertical heating furnace of this invention . It is a vertical front view of the conventional heating furnace apparatus. It is an enlarged view of the heater of the other conventional heating furnace apparatus.

DESCRIPTION OF SYMBOLS 1 Ceramic fiber furnace wall 2 Heating wire storage groove 3 Heating wire 4 Base 5 Blocking part 6 Support | pillar 7 Cooling air outlet 8 Inner heater 9 Outer heater 10 Ceramic rod 11 Ceramic wire 12 Spiral groove 13 Coiled heater 14 Ceramic rod fixture 15 Vertical heating furnace

Claims (3)

  A ceramic rod, a ceramic wire spirally wound around the ceramic rod, a spiral groove formed between the turns of the ceramic wire, and a coiled heating wire wound along the spiral groove. A coiled heater that is characterized.   It consists of a cylindrical furnace wall and a plurality of coiled heaters that are vertically spaced apart from each other in the circumferential direction on the inner surface of the furnace wall. The coiled heater is wound around the ceramic bar and spirally around the ceramic bar. A vertical heating furnace comprising a fixed ceramic wire, a spiral groove formed between each turn of the ceramic wire, and a coiled heating wire wound along the spiral groove.   3. The vertical heating furnace according to claim 2, wherein the coil heater is separated from the furnace wall.

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