JPS58690Y2 - Spacer for coil annealing - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a spacer that is inserted between each coil in order to equalize the heating temperature of each coil when the coils are stacked in several stages and annealed in an annealing furnace.

When annealing a coil, conventionally, as shown in Fig. 1, coils 2, 3, 4, and 5 are stacked on a base 1, and a donut-like shape is formed with unevenness of the same pitch W1 in the radial direction between each coil. This is done by inserting spacers 6 and supplying high-temperature gas to the gaps 7 created between each spacer 6 and each coil 2, 3, 4, and 5.

However, according to this method, since the pitch W1 of the unevenness formed on the spacer surface is the same, the upper and lower spacers 6 become symmetrical, and each coil 2, 3.4 during heating.
For example, if the bottom coil 2 and the top coil 5 are connected to the base 1, the heating temperature of the coils 2 and 5 is not uniform.
are heated at almost the same temperature, but in an annealing furnace where coils 3 and 4 in the middle part have a characteristic that the temperature is considerably lower than that of coils 2 and 5, coils 2 and 5 are heated to 650°C.
At this time, the temperature of coils 3 and 4 becomes approximately 600°C.

The present invention has been devised in view of this point, and will be described below based on FIGS. 4 to 6 showing embodiments thereof.

As shown in the figure, the spacer of the present invention has unevenness radially formed on the surface of a donut-shaped spacer 8 with different pitches, wide and narrow. It's twice the size.

When used in an annealing furnace where coils 3 and 4 have a lower temperature than coils 1 and 5 as described above,
As shown in FIG. 4, the spacer 8 of the present invention is inserted between the coils 2 and 3 and the coils 4 and 5, and the spacer 8 is inserted between the coils 3 and 4.
A large gap 11 is provided between the coil 2 and each spacer 8.
A small gap 12 is formed between each of the spacers 8 and 5, and high-temperature gas is fed into these gaps 11 and 12 for annealing.

Note that a spacer 6 similar to the conventional one is provided between the coils 3 and 4.
are inserted, and high-temperature gas is supplied to each gap formed between each spacer and each coil to perform annealing.

The spacer of the present invention prevents coils 2 and 5 from being exposed to high-temperature gas by the spacer 8 of the present invention during coil annealing where heat supply to the coil is performed mainly by bringing high-temperature gas into contact with the edges of the coil. The contact area with the coils 2 and 5 becomes smaller, and heat supply to the coils 2 and 5 is suppressed.

On the contrary, since a large gap 11 is formed between the coils 3 and 4 and the spacer 8 of the present invention, the contact area between the coils 3 and 4 and the high-temperature gas is increased, and the heat supply to the coils 3 and 4 is increased. Ru.

Note that a spacer 6 similar to the conventional one is provided between the coils 3 and 40.
is inserted, both coils 3 and 4 are connected by spacer 6.
- the heat supply is evenly distributed.

In this way, by using the spacer 8 of the present invention, the heat supply to the coils 2 and 5 at the upper and lower ends, which tend to reach relatively high temperatures, can be suppressed, and the temperature in the middle, which has conventionally been considerably lower than that of the coils 2 and 5, can be suppressed. Since the heat supply to the coils 3 and 4 is increased, the temperature of each of these coils becomes uniform, and the temperature of each coil does not become non-uniform as in the conventional case.

The above embodiment relates to an annealing furnace in which the coils 3 and 4 have a temperature lower than that of the coils 1 and 5, but according to the characteristics of the annealing furnace, the present invention is designed so that more high-temperature gas is sent to the lower temperature part. Needless to say, some ideas and spacers should be placed.

In addition, in the embodiment of the present invention, the ratio of the pinch W2 of the concave portion 9 to the pitch W1 of the convex portion 10 is set to 2:1, but the ratio is not limited to this, and may vary depending on the situation of the furnace such as the capacity of the gas convection fan, etc. By setting an appropriate ratio, the temperature of each coil can be made uniform.

Furthermore, a spacer with W and =O as shown in FIG. 6 is also effective in an annealing furnace where the temperature distribution is extremely uneven.

As explained above, the spacer of the present invention has an extremely simple structure in which the surface of the donut-shaped spacer is radially shaped with unevenness of different pitches, so that the temperature of the coil can be uniformized during annealing. However, it has great practical effects.

[Brief explanation of the drawing]

Figure 1 is an exploded sectional view of a conventional spacer inserted between each coil, Figure 2 is a perspective view of the same, Figure 3 is an enlarged perspective view of a portion of the same, and Figure 4 is the spacer of the present invention inserted between each coil. FIG. 5 is an enlarged perspective view of the same, and FIG.
The figure is a partially enlarged perspective view of a spacer showing another embodiment. 2.3, 4.5 are coils, 8 is a spacer, 9 is a recess, 1
0 is the convex portion, Wl and W2 are the pitches.

Claims (2)

[Scope of utility model registration request] (1) A spacer for coil annealing, which is used by inserting between coils when a plurality of coils are stacked and annealed, and is characterized in that the surface of the donut-shaped spacer is radially formed with unevenness of different pitches. (2) A spacer for coil annealing according to item 1 of the utility model registration, in which the narrower pitch is zero.