JPS58157317A - Method of producing snow melting composite magnetic ring - 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 The present invention mainly relates to a method for manufacturing a magnetic ring for snow melting that is attached to electric wires in order to prevent wire breakage accidents and collapse of steel towers due to snow accumulation on electric wires.

In general, snow accretion on electric wires occurs when the wire temperature drops below 3°C.
1), silicon steel (8%S1.-J・e), 45 permalloy (45XNi-Fe), varnish-x-A/
(49% co-2% V-Fe) etc. is attached to the wire, and the ring has 10,000 erp.
: , tlM-' or greater magnetic hysteresis loss actively generates heat and melts snow, but in general, lightning moves along the twisting direction of the wire before it falls down the wire, so it It is not necessary to cover with magnetic rings for snow melting, and it is effective just to attach the rings at intervals of about 50 aM, but the rings have a high saturation magnetic flux density, and the Curie temperature is as high as 400°C or higher, making it difficult to prevent snow from falling. In the summer, when there is no electricity, there is a problem with heat generation and transmission power loss. Therefore, one or two locations in the magnetization direction of the ring, that is, in the circumferential direction.
Fe-Ni, Fe-Ni, -Cr alloy,
It has been proposed to insert a material such as a Ni-Cu alloy as a temperature switch in a low Curie-temperature ferromagnetic injection circuit having a Curie-temperature of 0 to 150°C. This composite ring is
At low temperatures below one Curie temperature, the low Curie temperature material becomes ferromagnetic, creating a magnetic circuit of a composite ring consisting of a high saturation magnetic flux magnetic material (hereinafter referred to as "high saturation magnetic flux material") and a low Curie temperature material. When closed, heat is generated due to the magnetic history loss of the composite ring, but at high temperatures above the Curie temperature, the inserted low Curie temperature material becomes a low magnetic flux density or non-magnetic material, forming a magnetic gap in the composite ring. However, magnetic hysteresis loss is reduced and heat generation is suppressed. In this way, the composite ring can suppress heat generation at low temperatures and heat generation at high temperatures, and exhibits effective performance for snow melting. This invention relates to a manufacturing method for providing such an effective composite ring at low cost.

The present invention will be explained below with reference to drawings listed as examples.

In Figure 1, the magnetic hysteresis loss is 10,000erg-
A step (2) is provided on the end face of a ferromagnetic metal alloy strip (1) such as steel, silicon steel, 45% N'x-Fe permalloy, permendur, etc. with a Curie temperature of 400° C. or more and a Curie temperature of 400° C. or more. , Fe-Ni alloy, Fe-Ni-0r alloy, Ni-C having a Curie temperature of 0°C to 150°C in the stepped portion.
2 clad strips horizontally (4 clad strips)
), the cladding strip (4) is cut into appropriate dimensions in the transverse direction to form a cladding piece (5), and the cladding piece (5) is cut into a suitable size in the transverse direction.
5) is bent so that the low Curie temperature material (3) contacts the other end of the ferromagnetic metal alloy strip (1) with high magnetic hysteresis loss to produce a composite ring (6) or (65). .

The composite ring (6) or (6) is characterized in that it has a magnetic hysteresis loss of 5,000 erg, tm-' or more at 0°C.

In the present invention, the method of fixing the high magnetic loss ferromagnetic metal alloy strip and the low Curie temperature material may be brazing, soldering, welding, pressure welding, organic agent bonding, or the like.

The composite ring according to the present invention has a Y-circular cross-sectional shape, and the dimensions vary depending on the power transmission capacity of the wire, but the volume of the composite ring must be 8 or more, and the insertion thickness of the low Curie temperature material in the composite ring ((t) in FIG. 1) is preferably 0.2 to 10 times.

The reason why the Curi temperature of the low Curi temperature material to be inserted in the present invention is limited to 0°C to 150°C is because if it is less than 0'C, it will not generate heat at the snow accretion starting temperature of 3°C, so there will be no snow melting effect. If it exceeds the limit, it will generate heat even in the summer and cause loss of transmission power, which is undesirable.
JJ7 temperature is 50°C to 100°C. In addition, JJe Rimushi says that the magnetic history loss in Ot3 of the composite ring is 5,000 busy, because there is almost no snow melting effect below 5,000 Innu.14. The magnetic hysteresis loss of the composite ring at 0° C. is particularly effective when it is 20×10′8rg6′ or more. The magnetic hysteresis loss of the ferromagnetic metal alloy strip is 10. O
The reason for limiting it to OOerg-a- or higher is 10,000e.
Below rg-61-, a composite ring with a low Curie temperature material inserted has a rating of 5. This is because it is less than QQQarg-1'll-, and there is almost no snow melting effect. Particularly effective is 50,000 erg, -7 or higher.

The present invention will be demonstrated below by way of examples.

(Example 1) Saturation magnetic flux density at 22°C is 14.100 gaus
a Coercive force is 4.10e, magnetic hysteresis loss is 282 x 1
It has magnetic properties of 0'erg, cIl-, and the dimensions are width 1
0.2%C of 80fi x thickness 6.5 fin x length 200fi
A carbon steel strip with a Curi temperature of 100℃ and a dimension of 1
1] 30% N1 of 8ff x thickness tww x length 200I
-F'e alloy zone and Curie temperature is 70°C, dimensions are n; 30%Ni, -31%N with the same dimensions as the -Fe alloy
The i-8% Cr-Fe alloy strip was fabricated into the edge-in-lay clad strip shown in Fig. 1, then cut and bent into a shape with an outer diameter of 43 fl x 100 mm to adhere to the low Curie temperature material.
It was molded into a ring shape (6) with dimensions of width 3ON x height 15ff.

30% Nj-FI3 alloy as a low Curie temperature material,
Figure 2(a) shows the relationship between each atmospheric temperature and the magnetic hysteresis loss of the composite ring, depending on the insertion thickness (1,) of each Curie-temperature material when using a 31%Ni-8%Cr-Fe alloy. )(C).

Figure 2 (a) shows 30% N1 as a low-Kyuri temperature material.
−)゛Represents the case where e alloy is used, and (1) and (2) in the same figure.
) (3) (4) (5) Each curve shows the insertion thickness of low Curie temperature material 1) Off, 0.51ff, 1.0 respectively.
M, 2, Off; 4. Indicates the case of Off.

Figure 2 (G) shows 81%Ni as a low Curie temperature material.
- When using 8% Cr-Fe alloy, (1) in the same figure
(2) (3) (4) (5) As mentioned above, the insertion thickness 1) of each curve is Off, 0.5m, 1.0", and 2.Of, respectively.
f, 4. Indicates the case of Off.

The (1) curve in Figure 2 (C) is for a low Curie temperature material, and the (2) curve is for a 30% Ni, -Fe alloy. %N1
The relationship between insertion thickness 1) and magnetic hysteresis loss ratio of -8% Cr-Fe alloy is shown.

Note that FIG. 3 shows the shape and dimensions of the composite ring used in the above test.

As is clear from Figure 2 (a) (g) (0), the lower the Curi temperature of the low Curi temperature material, and the thicker the insertion thickness (1), the greater the composite ring's performance at below the Curi temperature. Magnetic hysteresis loss, i.e. the amount of heat generated, decreases from 30℃ to 0℃.
The magnetic hysteresis loss ratio, that is, the ratio of the amount of heat generated at low temperatures to that at high temperatures increases.

Magnetic hysteresis loss at 0°C is 26.5X10'erg,
m'.

A composite ring with a magnetic hysteresis loss ratio of 2.05 (low Curi-temperature material, 31% M-8% 0r-Fe alloy, Curi-temperature near 0°C, insertion thickness 2) is attached to 120-AC3'H. When a current of 60 Hz and 200 A was applied, when the ambient temperature was 17° C., the wire temperature was 1° C., at which snow was deposited, but the ring τ quality rose to lO'C, which did not cause MN. Further, when the ambient temperature was 25°C, both the wire temperature and the ring temperature were 46°C, and no heat generation was observed in the ring itself.

As described above, the present invention provides an effective composite ring that can be attached to electric wires at low cost and with good productivity in order to prevent disconnection accidents and collapse of steel towers due to snow accumulation on electric wires.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of the present invention. Figure 2 (a) Q
)) (c) is a chart showing the relationship between the material, insertion thickness, ambient temperature, and magnetic properties of the low Curie temperature material of the composite ring according to the present invention. FIG. 8 is a perspective view showing the shape and dimensions of the composite ring used in the characteristic test of the example. l Two ferromagnetic metal alloy strips, 2: Stepped portion, 3: Low Curie one-temperature material, 4: Two-strip clad material, 5: Clad piece, 6.6:
Composite ring, Figure 3, Figure 1, Voluntary procedure amendment ■, Indication of the case, Patent application No. 39743 of 1982, Name of the invention, Process for manufacturing a composite magnetic ring for snow melting, 3, Supplement 11:. Relationship Patent Applicant Address 5-22 Kitahama, Higashi-ku, Osaka Name Sumitomo Special Metals Co., Ltd. Representative Shige Oka (and 1 other person) 4 Agent 6, ``Detailed Description of the Invention'' of the specification to be amended Column 7, Contents of the amendment (1) In the 8th line of page 5 of the specification, the phrase “less than or equal to...” has been changed to “less than...” and in the 16th line of the same description, “by...” I will correct the text "I will prove it..." to "I will explain it...". that's all

Claims (1)

[Claims] A ferromagnetic metal alloy strip having a magnetic hysteresis loss of 10.000 erg-cN-' or more is subjected to an edge-in-lake hood process with a ferromagnetic metal alloy strip having a Curie temperature of 0°C to 1.50°C. Cut the Cuturad piece into an appropriate size in the transverse direction and bend it so that the low Curie temperature material contacts the other end of the ferromagnetic metal alloy strip, so that the magnetic hysteresis loss at 0°C is 5. 000 erg
, a' or more.