JP3166024U - Furnace heater - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate breakage of an electric heater wire due to extension during heat generation and cracking of an electric heater wire holder in a furnace heater having a configuration in which a linear electric heater wire is arranged in an outer pipe along the axial direction. .. SOLUTION: This is a furnace heater in which an electric heater wire 8 is linearly arranged along an axial direction of an outer pipe 3 in a state of being held by a holding body 7 in an outer pipe 3, and the holding body 7 is a shaft. A heater for a furnace composed of separating pieces 10 that are separated into a plurality of pieces in the direction. [Selection diagram] Fig. 1

Description

  The present invention relates to a furnace heater such as a heater for a molten aluminum holding furnace.

  In an aluminum die-cast molding machine, molding is performed using a molten aluminum supplied from a molten metal holding furnace. A furnace heater for heating is used in the molten metal holding furnace so that aluminum maintains a good molten metal state.

  As the furnace heater, there is a structure in which an electric heater wire made of a linear nichrome wire is disposed in the outer tube along the axial direction, and the electric heater is held by a holding body made of an insulator and is predetermined. Placed in position. In the case of such a heater for the furnace, the heating temperature is very high, so that the electric heater wire is extended when it generates heat and deforms to bend, and accordingly, the holder is cracked or the holder is strong. There was a risk that the electric heater wire would break.

  This invention has been made in view of the above points, and in a furnace heater having a configuration in which a linear electric heater wire is arranged along the axial direction in the outer tube, the electric heater wire is held by extension when heat is generated. It is intended to eliminate cracks in the body and breakage of the electric heater wire.

  The present invention provides a furnace heater in which an electric heater wire is linearly arranged along the axial direction of the outer tube in a state where the outer tube is held by the holding body, and the holding body is in the axial direction. The furnace heater is characterized by comprising a plurality of separation pieces separated in the above.

  The furnace heater having the above structure can be displaced in the axial direction because the holding body is composed of a plurality of separated pieces separated in the axial direction, and the displacement absorbs the extension of the electric heater wire during high temperature heat generation. This avoids breakage of the electric heater wire due to the extension of the electric heater wire and breakage of the holder.

  Furthermore, since the separation piece in the holding body is configured by a plurality of separation strips being assembled in an annular shape, the holding body can be displaced in the direction orthogonal to the axial direction. The absorption performance of the extension at the time of high temperature heat generation is further enhanced, and the effect of avoiding breakage such as breakage of the electric heater wire and cracking of the holding body is enhanced. In particular, according to this configuration, a holding body having a desired size can be obtained by appropriately selecting the number of separation pieces and separation strips, whereby furnace heaters having different outer tube sizes can be used as the holding body. There is an advantage that it can be produced without preparing different sizes. Conventional holders have been separately produced with different sizes by molding.

  Further, since the electric heater wire is arranged on the outer surface side of the holding body, the electric heater wire can be arranged close to the inner surface of the outer tube, thereby reducing the distance between the electric heater wire and the inner surface of the outer tube. The heating effect is enhanced because there is almost no heat insulation space there.

  According to this device, in a furnace heater having a configuration in which a linear electric heater wire is arranged in the outer tube along the axial direction, the holder is cracked due to the extension of the electric heater wire during heat generation, the electric heater wire As a result, the high-temperature heating is stably performed in this type of heater.

The block diagram of embodiment of the heater for aluminum molten metal holding furnaces of this device Sectional drawing of embodiment of the heater for aluminum molten metal holding furnaces of this device The perspective view of the isolation | separation strip of the holding body used in embodiment of the heater for aluminum molten metal holding furnaces of this invention The perspective view of the isolation | separation piece of the holding body used in embodiment of the heater for aluminum molten metal holding furnaces of this invention

  FIG. 1 is a block diagram of an embodiment of a heater for molten aluminum holding furnace according to the present invention, and FIG. 2 is a sectional view of the same.

  The aluminum melt holding furnace heater 1 is disposed along a cylindrical outer tube 3, a cylindrical inner tube 5 axially disposed therein, and the outer tube 3 and the inner tube 5. It consists of a holding body 7 and an electric heater wire 8 that is held by the holding body 7 and arranged linearly along the axial direction. Each of the outer tube 3, the inner tube 5, and the holding body 7 is made of a ceramic material. The holding body 7 is composed of annular separation pieces 10 formed by annularly assembling curved separation strips 9 shown in FIG. 3 and arranged in parallel along the axial direction thereof. Has a bellows shape. A mounting recess 13 for the pair of electric heater wires 8 is formed on the outer surface of the separation strip 9.

  Each of 11 is an electrode rod made of stainless steel, and one end side of the electrode rod is inserted into the inner tube 5 and fixed at both end positions of the inner tube 5. The electric heater wire 8 is made of a 1 cm diameter nichrome rod wire, and is arranged in a plurality of rows on the surface position of the holding body 7 by passing through the mounting hole 13 of the separation strip 9, and both ends 8a, 8b thereof are Each electrode 11 is electrically connected and fixed. The electric heater wires 8 are adjacent to each other at the ends located outside the inner tube 5 except for both ends 8a and 8b, so that the electric heater wire 8 forms a single line between both ends 8a and 8b. Are continuous.

  The actual electric heater wire 8 is attached to the holding body 7 by passing a pair of bent heater wire pieces through the insertion holes 13 on the adjacent side of the pair of separation strips 9 adjacent in the annular direction. A pair of separation strips 9 are connected to each other in the axial direction so as to have a predetermined length, and a plurality of the strips thus obtained are arranged along the peripheral surface of the inner tube 5, and the end of the heater wire strip This is done by electrically connecting the two.

  The heater 1 for molten aluminum holding furnace is attached with the base portion of the outer tube 3 being buried and fixed in the side wall 22 of the molten aluminum holding furnace 20. At this time, the electrode rod 11 protrudes outside the side wall 22 and is electrically connected and fixed to the electrode 26 in the distribution box 24 attached to the outer surface of the side wall 22.

  In the molten metal holding furnace heater 1 having the above-described configuration, the electric heater wire 8 as a whole generates high-temperature heat when an electric current is applied through the electrode rod 11, and the heat is transmitted to the outer tube 3 to hold the molten aluminum Aluminum A in the furnace 20 is heated. At that time, the electric heater wire 8 is arranged on the outer surface side of the holding body 7 and is close to the inner surface of the outer tube 3, and the distance between the electric heater 8 and the inner surface of the outer tube 3 is short, and there is almost no heat insulation space there. Thus, heat is transmitted to the outer tube 3 without waste, and the aluminum A is heated well.

  During heating, the electric heater wire 8 is elongated due to high-temperature heat generation (about 16 mm in 1 m at 1000 ° C.), but the extension is absorbed by the bellows-shaped holding body 7, and thereby the electric heater wire 8 Or breakage of the holder 7 such as a crack is avoided. That is, since the holding body 7 has a structure in which each of the separation pieces 10 is connected in a free state in the axial direction, any displacement in the X direction (shown in FIG. 1) is possible at any part, Further, since the separation piece 10 has a structure in which each of the separation pieces 9 is connected in an annular shape in a free state, any part can be slightly displaced in the Y direction (shown in FIG. 2). As described above, since the holding body 7 has a configuration in which the shape is flexibly changed, the extension of the electric heater wire 8 is absorbed, and the breakage of the electric heater wire 8 and the breakage of the holding body 7 are avoided.

1 Heater for molten aluminum furnace (heater for furnace)
3 Outer tube 5 Inner tube 7 Holder 8 Electric heater wire 10 Separation piece

Claims (3)

A furnace heater in which an electric heater wire is arranged linearly along the axial direction of the outer tube in a state held in a holding body in the outer tube,
The furnace heater according to claim 1, wherein the holding body is composed of a separation piece that is separated into a plurality of pieces in the axial direction.   The furnace heater according to claim 1, wherein the separation piece is constituted by a plurality of separation pieces assembled in an annular shape.   The furnace heater according to claim 1, wherein the holding body holds the electric heater wire on an outer surface of the separation piece.

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