JPS60109198A - Method of producing lonh heater - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a long heater used as an industrial heating source such as a heater for an electric furnace.

Conventional Structure and Problems Conventionally, JII heat has recently been widely used as a heater for electric furnaces due to its ease of use and thermal efficiency.

As shown in Fig. 1, this sheathed heater takes out electricity from a coiled heating wire 2 with electricity outgoing terminals 1 connected to both ends! 65f r Powder supply guide 6J positioned in the center of the metal pipe 5 with the support guide 3 and the electric outlet terminal support base 4 and moving in the downward direction: supplies remagnesia powder and moves the metal pipe 5 from side to side. By vibrating, the magnesia powder 7 is applied to the metal pipe 5.
is manufactured.

However, when manufacturing a long heater in which the long electrical outlet terminal 1 is used and the corrosion of the Kinzo pipe 5 is several meters long,
Powder 0 (In the conventional manufacturing method where there is a large clearance between the feed guide 6 and the electrical outlet end 1.1, the heating wire 2 is greatly eccentric due to the slight eccentricity of the electrical outlet terminal, so the metal pipe 5 and the electrical The dielectric strength with the take-out terminal 1 decreases, and the electrical resistance as a sheathed heater decreases.
＜The disadvantage of inhibiting was whitened. .

X% 1lli ITI l-l +' The present invention eliminates the drawbacks of the secondary N() and provides a method for manufacturing a long heater with excellent electrical properties, especially dielectric strength.

Structure of the Invention The present invention provides a fixing jig that has a hole for fixing a metal pipe and an electric/AC outlet terminal, and a through hole for magnesia powder. By fixing the JIIU terminal and filling it with shea powder, it is possible to prevent eccentricity of the electric IV, terminal and heating wire, and it has excellent dielectric strength. This makes it possible to manufacture long heaters with nf capability.

DESCRIPTION OF EMBODIMENTS 1: Examples of the present invention will be explained with reference to FIGS. 2 to 4. Note that the same parts (4) as in the conventional example are given the same reference numerals as in the conventional example, and the explanation thereof will be omitted.

As a modern pipe 5, the length is 2000171711, the outside i'f is 12.71 m, and the wall thickness is 0.63 mjll.
cF800 (trade name Incoloy 80o) was used, and as the heating wire 2, a Niku1J mu wire first scale with a wire diameter of 0.5 mKI was used.

This heating wire 2'f: has a coil shape with a winding diameter of 3 vtir,
Electrical output terminals 1 with an outer diameter of 31 m were connected to both ends.

On the other hand, as shown in the 21st section 1a and b, the cylindrical fixing 1? , 7 shells, 11 units, 11. ! ', a hole 12 with a diameter of 1311 m and a metal pipe 5 fixed in the center thereof;
Fix the electric outlet terminal 1 in this hole 12 with medium heat 3, the end of 11NJ■-fixing hole 13, and 1 of 3 TIrll located parallel to this terminal fixing hole 13 and supplying magnesia powder. "■ Install three water passages 14b,
Further, the fixing jig 11 is provided with a tapped hole 15f in a direction perpendicular to the terminal fixing hole 13.

The above fixed y, r,; ,! As shown in FIG. This was done by screwing the stator into the tapped hole 15 provided in the jig 11.

On the other hand, the lower electrical output terminal 1 was fixed with a conventional support 4.

With the above method, the electrical outlet terminal 1 and the metal pipe 5
After fixing, the +A& magnesia powder 7 stored in the hopper 16 is supplied through the through hole 14 of the fixing jig 11,
As before, the metal pizoro (L was vibrated from side to side, and the magnesia powder γ was completely filled.

Thereafter, in accordance with the conventional manufacturing method, the rolling zone 1r and annealing steps are carried out as shown in Fig. 4 (2,500 layers!
, 10 long heaters with an outer diameter of 11 km4 were completed and designated as sample numbers 11 to 2Q.

In addition, for this 1st blow, 10 long heaters were similarly completed using the conventional method without using the fixing jig 11 mentioned above, and sample numbers 1 to 1o were used. The insulating surface of the heater was determined as 1:'I, and the results are shown in Table 1.

As is clear from Table 1, the dielectric strength of sample numbers 1 to 100, which were made using the conventional sheathed heater manufacturing method, was between 50OV and 1100V, which was at a very low level. there were.

On the other hand, a test sample according to the manufacturing method of the embodiment of the present invention
Dielectric strength is 2500V for long heaters of R No. 11 to 20.
As shown in the figure, according to the method for manufacturing a long heater according to this embodiment, the electrical output terminal 1 is completely ni hard′, j! Therefore, even if a long metal vibro is used, the electrical outlet terminal 1 and the electrical cable 2 will not become 11of core, and the insulation force due to eccentricity will be low.
can do.

In addition, in the present invention, the structure of the fixing jig 11 is not limited to the example, and the filling method of the magnesia powder 7 is not shown in the example and is not limited to the method shown in the example. You may fill the fixing jig 11 once, apply rotational force to the metal vibro and heating wire 2, and fill with 10 magnesia powder.

Effects of the Invention As is clear from the above description, the present invention uses a fixing jig having a hole for fixing a metal pipe and an end of the metal pipe, and a plurality of holes through which the magnesia powder book passes. This is a method for manufacturing a long heater, in which an electrical output terminal is fixed and magnesia powder is filled through a plurality of holes of the fixing jig, and by this method, a long heater with excellent dielectric strength can be obtained. It becomes possible, and it is a person of Kamijo value (inc).

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the manufacturing method of a sheathed heater with &: [iic > Ic, Fig. 2 (?L) is a sectional view of the fixing jig JI used in the embodiment of the present invention, and Fig. 1 (b) is Fig. 3 is a cross-sectional view of the same fixing jig. :li is on the surface. 1... Electrical extraction terminal, 5... Metal pipe, 7... Magnesia powder, 11...
・Fixing jig, 12...hole, 13...hole (
terminal fixing hole), 14...through hole. Figure 1 Figure n2 (θ7) (b)

Claims (2)

[Claims] (1) Use a fixing jig that has a hole for fixing the metal pipe and the electric outlet end 1', and a water passage t' where magnesia powder is supplied to the metal pipe to remove air. A method for manufacturing a long heater, in which a terminal is fixed, the fi through hole is filled with remagnetic powder, the fixing jig is removed, and post-processing is performed. (2) Multiple through holes 13. (ll! Fixed fixture with 11, l
4′;Il,! using iJ, 'lul'l-i〈range I,! 11 10゛ (1㎼ 11《 long heater manufacturing force゛θ19.