JPH0431518Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a support structure for a heater suspended along the inner surface of a rigid sintering furnace.

"Prior Art" In general, a rigid sintering furnace has a cylindrical heating chamber 2 disposed inside a rigid cylindrical furnace body 1 with a heat insulating material, as shown in FIGS. 4 and 5. And the heating chamber 2
A plurality of rod-shaped heaters 3 (18 in this example) are attached along the inner wall surface of the heater.

The above heaters 3 are connected to each other with their upper ends fixed to six upper heater connectors 4, three each, and their lower ends fixed to three lower heater connectors 5, six each. The upper heater connector 4... is fixed to the upper part of the heating chamber 2, and the power supply rod 6... is connected to this, but the lower heater connector 5... only connects the lower end of the heater 3... The heaters 3 are not fixed to the heating chamber 2, and are therefore suspended from the upper heater connectors 4.

The reason why the heaters 3 are suspended in this way is to allow the heaters 3 to deform freely without restraining the thermal expansion that occurs when the temperature rises, and to reduce the thermal stress that occurs when both ends are fixed. This is to prevent the heaters 3 from being damaged.

``Problems to be solved by the invention'' By the way, in the above-mentioned vertical sintering furnace, the heaters 3... are arranged in a suspended state and their lower ends are not restrained in any way, so conventional methods The following problems arose.

In other words, when the heaters 3... reach a high temperature during sintering, each heater 3... thermally expands and its length increases;
It is common that the amount of elongation of ... is not equal and varies. Therefore, if there is a large variation in the amount of expansion of the six heaters 3 connected to one lower heater connector 5, the heaters 3 will be twisted and their lower ends will swing. In some cases, the lower heater connector 5 moves in the radial or circumferential direction of the heating chamber 2 and comes into contact with the inner wall of the heating chamber 2, or the lower heater connectors 5 come into contact with each other and are damaged.

This kind of thing is particularly likely to occur in large furnaces that use long heaters 3. Therefore, in conventional large furnaces, the heaters 3 are divided into upper and lower stages to prevent each heater 3 from becoming too long. However, in this case, the required number of heater connectors 4 and 5 is doubled, and the power supply equipment is also complicated, resulting in an increase in cost.

This invention was made in view of the above-mentioned circumstances, and aims to provide a support structure for a heater that has a simple structure and can prevent the lower end of the heater from swinging.

``Means for solving the problem'' This invention involves attaching a steady rest rod extending upward or downward to a predetermined position of the lower heater connector, and heating a support member having a cylindrical body into which the steady rest rod can be loosely inserted. The steady rest rod is fixed to the wall surface of the chamber and loosely inserted into the cylindrical body of the support member, so that the steady rest rod is engaged with the support member in a vertically movable state. It is said that

``Function'' The support structure of the heater of this invention does not restrict the expansion of the heater in the axial direction, but only the movement in the horizontal direction, by loosely inserting the steady rest rod into the cylindrical body of the support member. to prevent rocking.

"Example" An example in which the heater support structure of this invention is applied to the vertical sintering furnace shown in FIGS. 4 and 5 above will be described below in FIGS. 1 to 3. Explain with reference to.

The support structure of this embodiment includes steady rest rods 10 attached to each lower heater connector 5, and
By engaging the support members 11 fixed to the wall surface of the heating chamber 2, the lower end of the heater 3 is prevented from swinging.

That is, two bar-shaped steady rest rods 10, 10 are attached to each of the lower heater connectors 5, each extending upward from the upper surface thereof. Furthermore, support members 11 are fixed to the wall surface of the heating chamber 2 at positions corresponding to the mounting positions of the steady rest rods 10. This support member 1
1, as shown in FIG. 2, includes a cylindrical body 12 whose inner diameter is slightly larger than the outer dimension of the steady rest rod 10, and a threaded portion extending from the side surface of the cylindrical body 12 at the end. 13 is formed by a rod-shaped body 14. This support member 11
The rod-shaped body 14 passes through a through hole 2a provided in the wall of the heating chamber 2, and is tightened with nuts 17 and 18 to an insulating material 16 that is fixed to the outer wall of the heating chamber with bolts 15 and 15. , cylindrical body 1
It is fixed in such a state that the axis line of No. 2 extends in the vertical direction. As shown in FIG. 3, the steady rest rod 10 is loosely inserted into the cylindrical body 12 of the support member 11 fixed in the heating chamber 2, and the steady rest rod 10 is oriented in the axial direction (that is, in the vertical direction). It is in a state of being able to move freely.

According to this support structure, the engagement between the steady rest rod 10 and the support member 11 can prevent the lower heater connector 5, that is, the lower end of the heater 3, from swinging, and also prevent the heater 3 from expanding due to thermal expansion. When the lower heater connector 5 moves downward, the steady rest rod 10 moves within the cylindrical body 12, so its elongation is not restricted in any way, and no thermal stress is generated on the heater 3.

Therefore, by providing this support structure, it is possible to effectively prevent the lower heater connectors 5 from coming into contact with the inner surface of the heating chamber 2 or from contacting each other, and this support structure is especially applicable to large furnaces. Then there is no need to divide the heater into two stages. Furthermore, since the configuration is extremely simple, there is no increase in cost.

In addition, although the steady rest rod 10 is configured to extend upward from the upper surface of the lower heater connector 5 in the above example, it may be configured to extend downward from the lower surface. Furthermore, in the above example, one lower heater connector 5 is supported at two locations, but the number of locations may be one or more depending on the shape and size of the lower heater connector.

"Effects of the invention" As explained in detail above, according to this invention, a steady rest rod extending upward or downward is attached to the lower heater connector, and this steady rest rod is loosely inserted into the cylindrical body of the support member. Therefore, only the swinging of the lower end of the heater in the horizontal direction can be restricted without restricting the expansion of the heater in the axial direction. Therefore, it is possible to prevent the heater from being damaged due to thermal stress, and also to prevent the lower heater connectors from coming into contact with the heating chamber wall surface or contacting each other.

[Brief explanation of drawings]

Figures 1 to 3 show an embodiment of this invention. Figure 1 is a cross-sectional plan view of a rigid sintering furnace equipped with a heater support structure of this embodiment, and Figure 2 shows its main parts. FIG. 3 is a perspective view of the main parts. FIGS. 4 and 5 schematically show the structure of a conventional vertical sintering furnace, with FIG. 4 being an elevational sectional view and FIG. 5 being a plan sectional view. 2... Heating chamber, 3... Heater, 4... Upper heater connector, 5... Lower heater connector, 10... Steady rest rod, 11... Supporting member, 12... Cylindrical body.

Claims (1)

[Scope of utility model registration request] The upper end is supported by the upper heater connector so that it is suspended along the inner wall surface of the heating chamber, and the lower end has a rigid structure to prevent the rod-shaped heater connected to the lower heater connector from swinging. A support structure for a heater in a mold sintering furnace, wherein a swing stop rod extending upward or downward is attached to a predetermined position of the lower heater connector, and a support member having a cylindrical body into which the steady rest rod can be loosely inserted is provided. The steady rest rod is fixed to the wall surface of the heating chamber and loosely inserted into the cylindrical body of the support member, so that the steady rest rod is engaged with the support member in a vertically movable state. Features a support structure for the heater in a vertical sintering furnace.