JPH08336203A - Low noise insulator - Google Patents

Abstract

PURPOSE: To obtain a low noise insulator in which the aerodynamic noise is reduced at the time of high speed running while ensuring required electric insulation performance. CONSTITUTION: The flange 32 of an insulator 30 is provided with creases 34a, 34b, 35a, 35b, 36a, 36b, 37a, 37b (36b, 37a, 37b are hidden behind the drum 31) extending in the running direction of train, i.e., in the direction A. Since these creases elongate the surface distance of insulator, the width of insulated viewed from the running direction of train can be made shorter than the width viewed from the perpendicular direction. Consequently, the air resistance is decreased at the time of high speed running resulting in the reduction of aerodynamic noise.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a low-noise insulator, and more particularly to a low-noise insulator suitable for use in a current collector of a railroad vehicle traveling at high speed.

[0002]

2. Description of the Related Art Aerodynamic noise accompanying the speeding up of railway vehicles increases in proportion to the eighth power of the speed, and therefore increases rapidly as the vehicle speed increases. On the other hand, interest in environmental protection is expected to increase in the future. Therefore, a low-noise current collector is required for vehicles running at high speed.

As an example of a low-noise current collector for a high-speed vehicle, see Nikkei Mechanical, May 4, 1992, pages 22 to 40, "Fast Shinkansen," page 27, FIG. 4 and FIG. A T-shaped current collector as shown has been proposed.

This is a structure in which a member for holding a sliding plate for contacting an overhead line and collecting current is supported by a single insulator in the form of a streamline, and the disturbance of the air flow around the current collector is suppressed to reduce noise. It is a thing. Further, a current collector based on the same idea is disclosed in Japanese Patent Laid-Open Nos. 5-19103 and 5-49104.

[0005]

In the above T-type current collector, the number of individual structural members is reduced instead of being increased, and the number of sliding plate holding members (hereinafter referred to as current collectors) is reduced. Due to the effect of forming a streamlined shape, noise can be reduced to some extent as compared with a current collector which is conventionally called a pantograph which is a combination of thin rods.

However, with respect to the support insulator that holds the current collector and the cable head insulator that draws the collected power, a predetermined surface distance is required in order to ensure the necessary electrical insulation performance, and there is a restriction on size reduction. is there. For this reason, the turbulence of the airflow is large during high-speed traveling and the aerodynamic noise is large, so there is a limit to the noise reduction of the current collector. Conventional technology has not paid sufficient attention to this point.

It is an object of the present invention to provide a low noise insulator which has a necessary electric insulation performance to be used for a current collecting device for a railway vehicle and has a small aerodynamic noise at high speed running.

[0008]

A feature of the present invention is that a fold extending in the train running direction is provided on the cap surface of the insulator. As a material suitable for realizing this structure, the insulator is made of a polymer resin instead of the conventional porcelain.

[0009]

[Function] Since the folds provided on the cap surface of the insulator and extending in the train traveling direction increase the surface leakage distance of the insulator in the direction perpendicular to the train traveling (hereinafter referred to as the lateral direction), the lateral dimension of the insulator is small. However, the surface leakage distance can be increased. On the other hand, since the insulator has a small lateral dimension, the air resistance during high-speed traveling is small and the aerodynamic noise is also small.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an external view of a high-speed train equipped with a current collector using the low noise insulator of the present invention. The train is running in the A direction.

As shown in the figure, the vehicle body 2 is designed to reduce noise.
Has a smooth outer surface, and the trolley and underfloor equipment are also covered with the cover 2c. The lower half of the current collector 20 is located at a position surrounded by the storage dome 4, and the supporting insulator 3 for insulation is used.
0, the conductive cable head 50, the current collector 22, and other main current collecting members protrude from the substantially central portion of the storage dome 4 and contact the overhead wire 1 during current collection. The storage dome 4 has a streamlined outer surface with low air resistance.

FIG. 2 is an enlarged view of an insulating support insulator 30 according to an embodiment of the present invention. The direction A of the axis xx 'is the train traveling direction. The insulator 30 is composed of a combination of a body 31 and a cap 32, and mounting fittings 33a and 33b are provided on the upper and lower sides. Here, as an example, an example in which eight shades 32 are shown. According to the present invention, the shaft x-
folds 34a, 34b, 35a, 35b extending in the x'direction,
36a, 36b, 37a, 37b (36b, 37a, 3
7b is not visible due to the shadow of the body 31).

FIG. 3 shows a cross section (referred to as an x cross section) of a plane including the axis xx 'and the axis zz' in FIG. Cap 32 of this cross section
The surface leakage distance per sheet is 1x in FIG.

FIG. 5 shows a cross section (referred to as y cross section) of a plane including the axes yy 'and zz' in FIG. Cap 32 of this cross section
The surface leakage distance for each sheet is ly in FIG. In order to secure the electrical insulation performance required as an insulator, this lx
And ly must have a certain size or more. The feature of this embodiment is that the width of the y-section indicated by Wy in FIG. 5 can be made smaller than the width of the x-section indicated by Wx in FIG. 3 even if lx and ly have the same size. This relationship is shown in FIG. 7 when seen in the VII-VII ′ cross section of FIGS. 3 and 5, and the width Wy of the insulator cap 32 viewed from the direction A, which is the train traveling direction, is greater than the width Wx viewed from the lateral direction. It is getting smaller.

Here, the flow of air around the insulator when the insulator is used as a current collector of a train and travels at high speed will be examined.
FIG. 8 shows an example of a cross section of a conventional insulator cap 32 ′, and FIG. 9 shows an example of an air flow of a cross section of an insulator cap 32 ″ according to one embodiment of the present invention. Insulator dimensions are W ″
Since <W ', the turbulence of the air flow is smaller in the present invention,
Aerodynamic noise is reduced.

The insulator of the embodiment of the present invention has no noise reduction effect on winds in the direction perpendicular to the train traveling direction, so-called cross winds, and on the contrary, increases air resistance and noises. However, for example, when the traveling speed of the train is 180 km / h, the speed is 50 m / s, and when the speed is 360 km / h, the speed is 100 m / s. On the other hand, the crosswind occurs only during abnormal weather such as a typhoon, and the train can usually travel at this time. Is a wind speed of 25 m / sec or less. Considering that the aerodynamic noise increases in proportion to about the eighth power of the speed, the noise increase due to the cross wind is negligible.

Since the conventional insulator has a circular cross section and is axially symmetric, it can be rotationally molded and can be easily manufactured with porcelain, but the insulator of the present invention is difficult to manufacture with porcelain.
As an example of the manufacturing method, it is suitable to fill the mold with a polymer resin for manufacturing. Therefore, in this embodiment, as shown in FIG.
The shape is such that the mold can be removed in the xx ′ direction of.

FIG. 10 shows a cross section of an insulating support insulator 30 according to a modification of the present invention. Regarding the direction A in which the train of the shade 32 travels, from the point of securing the surface insulation distance, it is sufficient to be up to the broken lines 38, 38 ', but in this embodiment, it is further extended to have an acute end shape. . According to this embodiment, the turbulence of the air flow in the A direction during high-speed traveling becomes smaller, which is effective in reducing noise.

FIG. 11 shows a cross sectional insulator 30 of a low noise insulator 30 according to another embodiment of the present invention. When a large number of caps are provided to extend the surface insulation distance of the insulator, the caps 32 and 32 'adjacent to each other are provided.
Will be in close proximity. At this time, if the distance between the folds provided on the cap surface becomes too short, the insulation performance may be impaired due to bridging by raindrops.

Therefore, in the embodiment of FIG. 11, the folds 3 of the shade 32 are
4a, 34b, 35b, 36b, 37a, 37b and the folds 34a ', 35a', 36a ', 37 of the adjacent shades 32'.
The position of a'is shifted in the lateral direction of train travel, that is, in the y direction of FIG. According to the present embodiment, it is possible to realize a low noise insulator in which the insulation performance is not impaired by raindrops without making the entire insulator long.

FIG. 12 shows a low noise insulator 30 according to still another embodiment of the present invention. In this embodiment, the folds 34b, 35b, 36b, 37b are provided only on the lower surface of the shade 32. In particular, in a train traveling in an area where air pollution is severe, if a fold is provided on the upper surface of the shade, a large amount of dust or the like deposited at the time of precipitation may adhere to the corners and impair the insulation performance.

On the other hand, in this embodiment, the upper surface of the shade 32 is flattened to prevent dust and the like from adhering, and to prevent deterioration of the insulation performance.

Although the embodiments and effects of the present invention have been described above by taking the insulating support insulator as an example, the cable head insulator and the air insulator tube (the air insulator tube is not used in the high-speed rail vehicle shown in FIG. 2 as an example). The present invention can also be applied to, and has an effect of reducing aerodynamic noise during high-speed traveling.

[0025]

According to the present invention described above, since the long folds are provided on the shade surface in the train running direction, the cross section viewed from the train running direction can be reduced while securing the necessary surface insulation distance. Aerodynamic noise during high-speed traveling can be reduced. And
It is possible to provide a low-noise current collector for high-speed railway vehicles.

[Brief description of drawings]

FIG. 1 is a front view of a high-speed railway vehicle equipped with a current collector using a low-noise insulator according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a low noise insulator according to an embodiment of the present invention.

FIG. 3 is a cross-sectional view of the low noise insulator of one embodiment of the present invention as seen from a direction perpendicular to the train traveling direction.

FIG. 4 is a partial cross-sectional view showing a surface insulation distance of a cross section of the low noise insulator of one embodiment of the present invention as seen from a direction perpendicular to the train traveling direction.

FIG. 5 is a cross-sectional view of a low noise insulator according to an embodiment of the present invention as seen from the train traveling direction.

FIG. 6 is a partial cross-sectional view showing a surface insulation distance of a cross section of the low noise insulator of one embodiment of the present invention as seen from the train traveling direction.

FIG. 7 is a cross-sectional view of the low noise insulator of one embodiment of the present invention taken along the line VII-VII ′ of FIGS. 3 and 7.

FIG. 8 is a cross-sectional view showing an air flow of an example of a conventional insulator.

FIG. 9 is a cross-sectional view showing the flow of air in an example of the insulator of the present invention.

FIG. 10 is a sectional view of a low noise insulator of a modified example of the present invention.

FIG. 11 is a cross-sectional view of an embodiment of the present invention in which a low-noise insulator with the folds displaced is viewed from the train traveling direction.

FIG. 12 is a cross-sectional view of a low noise insulator in which one embodiment of the present invention is provided with folds only on the lower surface of the shade, as seen from the traveling direction of the train.

[Explanation of symbols]

1 ... overhead wire, 2 ... vehicle body, 2c ... cover, 4 ... storage dome,
20 ... Current collector, 21 ... Riding plate, 22 ... Current collector, 30 ...
Support insulator, 31 ... Insulator barrel, 32, 32 ', 32 "... Insulator cap, 33a, 33b ... Mounting metal fittings, 34a, 34
a ', 34b, 35a, 35a', 35b, 36a, 3
6a ', 36b, 37a, 37a', 37b ... Folds, A ...
Train running direction, lx, ly ... Surface insulation distance, W ',
W ″, Wx, Wy ... Insulator width.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akiyoshi Iida 502 Jinritsucho, Tsuchiura-shi, Ibaraki Machinery Research Institute, Hiritsu Seisakusho Co., Ltd. Hitachi Ltd. Kasado Plant (72) Inventor Kenzo Kadani 4-13-1, Higashimachi, Hitachi City, Ibaraki Prefecture Hitachi Chemical Co., Ltd. Yamazaki Plant

Claims (4)

[Claims] 1. A low noise insulator characterized in that folds extending in the train traveling direction are provided on the cap surface of an insulator composed of a body and a cap made of an electrically insulating material. 2. The low noise insulator according to claim 1, wherein:
A low-noise insulator characterized in that the positions of the folds provided on the adjacent shades are displaced in a direction perpendicular to the train traveling direction. 3. The low noise insulator according to claim 1, wherein:
A low noise insulator characterized in that the folds extending in the train traveling direction are formed only on one surface of an insulator cap. 4. A low noise insulator characterized in that the insulator according to claim 1, 2 or 3 is formed of a polymer resin.