JPH04301323A - Noise preventing insulator - Google Patents

Abstract

PURPOSE:To prevent the generation of noise by wind. CONSTITUTION:A shade section 2 is provided on an insulator main body 1, and multiple circular and concentric pleat sections 3 are provided on the inside face of the shade section 2. The first pleat section 3a provided at the outermost end of the shade section 2 is made longest than other pleat sections 3 and extended most downward. The angle of the line L passing the lower end edge section of the first pleat section 3a and the lower end edge section of the second pleat section 3b against the horizontal line S is made at least 35 deg. or above. The angle theta is set to 40 deg. here. When multiple insulator main bodies 1 are connected to form a suspended insulator train 10, the insulator train 10 rarely generates noise when applied with a strong wind.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a noise-preventing insulator capable of preventing wind-induced noise.

0002

2. Description of the Related Art Generally, an insulator body constituting a suspended insulator is provided with a cap and a plurality of annular and concentric folds formed on the inner surface of the cap. A plurality of suspension insulators are connected in series to form a suspension insulator chain, and the suspension insulator chain is suspended and supported by the support arm of the steel tower.
Power lines are supported at its lower end.

0003

[Problem to be Solved by the Invention] However, when a chain of suspended insulators is exposed to strong winds and the wind hits the folds of each suspended insulator, air vibrations occur in the space between the folds. There were cases where the noise was extremely loud. An object of the present invention is to provide a noise prevention insulator that can prevent noise from being generated by wind.

0004

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a cap section on the insulator body, and a plurality of annular and concentric folds on the inner surface of the cap section. In the provided insulator, there is a gap between the first pleat provided at the outermost end of the shade and the second pleat adjacent to the first pleat. A relationship is set such that a line passing through the tip edge of the two pleats forms an angle of at least 35 degrees with respect to a horizontal line.

[0005]

Therefore, according to the present invention, even if the insulator is exposed to strong winds, the generation of sound in the space between the pleats is prevented.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment embodying the present invention will be described below with reference to the drawings. As shown in FIG. 1, an insulator main body 1 constituting a suspended insulator includes a cap part 2, a plurality of folds 3 formed annularly and concentrically on the inner surface of the cap part 2, and further includes a cap part 2. 2 and a capped cylindrical head 4 formed at the upper center thereof.

A cap fitting 6 is fixed to the outer periphery of the head 4 with cement 5. An engagement recess 6a is formed on the upper surface of the cap metal fitting 6, so that a pin metal fitting 7 of another suspension insulator connected directly above can be engaged therewith. The upper part of the pin fitting 7 is inserted into a fitting recess 8 formed inside the head 4 and fixed with cement 9. Further, the lower end of the pin fitting 7 is engaged with the fitting recess 6a of the cap fitting 6 of another suspension insulator connected directly below. A suspension insulator chain 10 is formed by connecting a plurality of suspension insulators in series in this manner.

[0008] Here, the folds 3 formed in the cap 2
Among these, the fold 3 formed at the outermost end of the cap 2 is defined as a first fold 3a, and the fold 3 adjacent to the first fold 3a is defined as a second fold 3b. The first pleat section 3a is formed to be the longest compared to the other pleat sections 3, that is, to extend furthest downward, and the second pleat section 3b is formed to be shorter than the first pleat section 3a. That is, as shown in FIG. 1, between the first pleat part 3a and the second pleat part 3b, there is a line L passing through the lower edge of the first pleat part 3a and the lower edge of the second pleat part 3b. A relationship is set such that the angle θ with respect to the horizontal direction line S is at least 35 degrees or more. In this embodiment, the angle θ is set to 40 degrees.

The inventor of the present application proposed that the line L passing through the lower edge of the first pleat 3a and the lower edge of the second pleat 3b is at an angle of at least 35 degrees or more with respect to the horizontal line S. We have confirmed through the following tests that wind-induced noise can be prevented if the settings are set as follows. Here, the test method will be explained. As shown in FIG. 2, an 80 cm square ventilation opening 12 is formed on the wall of the wind tunnel laboratory 11 at a height of 1 m above the ground. A suspension insulator chain 10 formed by connecting a plurality of suspended insulators is suspended from the ceiling of the wind tunnel laboratory 11 at a position 75 cm away from the air outlet 12. In addition, in order to measure the sound pressure level of noise generated from the suspended insulator chain 10 due to the wind, a sound collecting microphone 13 was placed at a height of 1.3 m above the ground and 50 cm away from the suspended insulator chain 10.
is installed. In addition, the wind speed from the ventilation port 12 is 30 m/
A wind of s is directed perpendicularly to the suspended insulator chain 10, ie parallel to the horizontal line S.

A plurality of insulator bodies are prepared as test samples. That is, as shown in FIG. 3, the insulator body A is
The second pleat part 3b is formed longer than the first pleat part 3a, and the line L passing through the lower edge of the first pleat part 3a and the lower edge of the second pleat part 3b is aligned with the horizontal direction line S of the insulator. It forms an angle of 17 degrees with the center side facing down. As shown in Figure 4,
In the insulator body B, the first fold part 3a is 3 times smaller than the second fold part 3b.
mm longer, that is, the lower edge of the first pleat 3a and the second
The line L passing through the lower edge of the pleated portion 3b has almost no angle with respect to the horizontal line S.

As shown in FIG. 5, the insulator body C has a cap 2
The outer end edge of the groove protrudes further outward from the first pleated portion 3a. The first fold part 3a is the second fold part 3.
b, and the lower edge of the first pleat 3a and the second
A line L passing through the lower edge of the pleated portion 3b forms an angle of 40 degrees with respect to the horizontal line S, with the center side of the insulator rising upward.

As shown in FIG. 6, in the insulator body D, compared to the insulator body C, the first pleated portion 3a is bent outward at the intermediate portion thereof. And the first fold part 3
A line L passing through the lower edge of a and the lower edge of the second pleat 3b
However, like the insulator body C, it forms an angle of 40 degrees with respect to the horizontal line S, with the center side of the insulator rising. As shown in FIG. 7, in the insulator body E, the first pleat part 3a is formed longer than the second pleat part 3b, and passes through the lower end edge of the first pleat part 3a and the lower end edge of the second pleat part 3b. The line L forms an angle of 35 degrees with respect to the horizontal line S, with the center side of the insulator rising.

As shown in FIG. 8, in the insulator body F, the second pleat part 3b is formed longer than the first pleat part 3a, and the lower end edge of the first pleat part 3a and the lower end edge of the second pleat part 3b are formed. The line L that passes through is lowered on the insulator center side with respect to the horizontal line S37
It forms an angle of degrees. 6 configured as above
A suspended insulator chain 10 is formed by connecting six or eight different types of insulator bodies, and the sound pressure level of the noise generated in each suspended insulator chain 10 is measured using the test method described above. Incidentally, it has been confirmed that there is no significant difference in the sound pressure level of noise whether the number of connected insulator bodies is six or eight. As is clear from the test results shown in FIG. 9, the angle of the line L passing through the lower edge of the first pleat 3a and the lower edge of the second pleat 3b with respect to the horizontal line S is larger. It is confirmed that the sound pressure level is low. In other words, if the line L passing through the lower edge of the first pleat 3a and the lower edge of the second pleat 3b is at least 35 degrees or more with respect to the horizontal line S, noise can be substantially prevented. In addition, the sound pressure level is approximately 9
It is determined whether or not to recognize noise as a noise between 5 and 97 dBA.

Based on the above test results, the insulator body 1 was shaped as shown in FIG. 1 in consideration of ease of manufacture. When a plurality of insulator bodies 1 shown in FIG. 1 are connected to form a suspended insulator chain 10, this insulator chain 10 hardly generates noise even when exposed to strong winds. Note that the present invention is not limited to the above-mentioned embodiment, and for example, the first fold portion 3
A line L passing through the lower edge of a and the lower edge of the second pleat 3b
The angle θ with respect to the horizontal line S is further increased, that is, the first pleat portion 3a is formed longer, the second pleat portion 3b is formed shorter, or the second pleat portion 3b is not formed. The configuration of each part may be arbitrarily changed without departing from the spirit of the invention, such as by forming the second pleat part 3b longer than the first pleat part 3a so that the angle θ is 35 degrees or more. It is also possible to do so.

[0015]

As described in detail above, the present invention exhibits the excellent effect of preventing the generation of noise caused by wind.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing an embodiment of a noise prevention insulator embodying the present invention.

FIG. 2 is a side view of the wind tunnel laboratory.

FIG. 3 is a partial sectional view showing an insulator body as a test sample.

FIG. 4 is a partial sectional view showing an insulator body as a test sample.

FIG. 5 is a partial sectional view showing an insulator body as a test sample.

FIG. 6 is a partial sectional view showing an insulator body as a test sample.

FIG. 7 is a partial sectional view showing an insulator body as a test sample.

FIG. 8 is a partial sectional view showing an insulator body as a test sample.

FIG. 9 is a diagram showing the sound pressure level of an insulator body as a test sample.

[Explanation of symbols]

1 insulator body, 2 cap, 3 pleat, 3a
First pleat, 3b Second pleat, L Line passing through the lower edge of the first pleat and the lower edge of the second pleat, S Horizontal line.

Claims (1)

[Claims] Claim 1. An insulator in which a cap is provided on the insulator body and a plurality of folds are provided in an annular and concentric manner on the inner surface of the cap, wherein a plurality of folds are provided at the outermost end of the cap. Between a first pleat and a second pleat adjacent to the first pleat, a line passing through the tip edge of the first pleat and the tip edge of the second pleat is a horizontal line. A noise prevention insulator characterized by having an angle of at least 35 degrees or more with respect to the noise prevention insulator.