JPH09182207A - Sound insulation equipment of collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a sound insulation equipment small in air resistance and low in aerodynamic sound, by lowering the height of front and rear walls more than the height of the sidewall. SOLUTION: Sidewalls 3 are providid roughly parallel on both sides of the right and left on the roof of a vehicle, being attached at a maximum height H within the limit of the vehicle. Both ends of the sidewall 3 are installed at an angle θ of attachment onto the roof of the vehicle body 1. Front and rear walls 4 are provided in front and rear positions of a pantagraph collector besides being between a pair of sidewalls 3, and they are installed a height H lower than the height H of the sidewall 3. The side of one end of the sidewall 3 is projecting forward from the front of the front wall 4. The other end of the sidewall 3 is projecting rearward from the rear of the rear wall 4 in running direction. According to this constitution, spark sound, sliding sound, etc. from a pantagraph collector 2 at the running of a vehicle can be screened enough by the sidewalls 3 having enough height H, provided on both sides on the roof of the vehicle.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound insulation device for a current collector, and more particularly to a sound insulation device for a pantograph current collector suitable for a railway vehicle traveling at high speed.

[0002]

2. Description of the Related Art Noise generated from a pantograph current collector of a vehicle includes spark noise, sliding noise, aerodynamic noise, and the like, which are highly dependent on speed. It increases by almost the sixth power rule. Conventionally, as a method of reducing noise from a pantograph current collector, as disclosed in Japanese Patent Application Laid-Open No. 52-25310, side barriers are provided on both sides of a pantograph, and noise from the pantograph current collector is blocked by the side barriers. As described in Japanese Patent Application Laid-Open No. 58-4667, front and rear walls together with side barriers are provided around a pantograph current collector.

[0003]

In the above prior art, the sound generated from the pantograph current collector is shielded, and the front and rear walls have a sufficient height with respect to the maximum height of the pantograph current collector. By optimizing the front inclination angles of the front and rear walls, the average flow velocity of the airflow hitting the pantograph current collector can be reduced, and the sound pressure level of the aerodynamic sound of the pantograph current collector can be reduced. Also, the side walls provided on both sides of the vehicle body provide a spark and sliding noise shielding effect.

Here, in order to reduce the average flow velocity of the air flow hitting the pantograph current collector, the height of the front and rear walls of the sound insulation device of the pantograph is made sufficiently high, and the inclination angle of the front surface is made large. It is effective to increase the separation of the airflow at the upper end of the upstream front wall, but this increase in height and the inclination angle of the front surface increase air resistance and increase the aerodynamic noise of the pantograph sound insulation device itself. was there.

An object of the present invention is to reduce air resistance and reduce aerodynamic noise.

[0006]

The above object can be achieved by making the height of the front and rear walls lower than the height of the side walls.

According to the above construction, the side walls provided on both sides of the vehicle roof and having a sufficient height can sufficiently shield the spark noise, sliding noise, etc. from the current collector when the vehicle is traveling. . Further, by forming a large inclination angle on the front surfaces of the front and rear walls by a straight line or a parabolic surface, the separation at the upper end of the upstream front wall becomes large, and the average flow velocity at the position of the current collector can be reduced. Can reduce the noise. Further, since the height of the front and rear walls can be reduced in this way, the running resistance can be reduced. Further, since the front and rear walls are arranged between the pair of side walls and the height of the front and rear walls is lower than that of the side walls, noise (aerodynamic noise) generated by the separation of the air flow near the apex of the front and rear walls is generated on the side walls. It can be shielded.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a first embodiment of a sound insulation device for a pantograph current collector according to the present invention. 1 is a vehicle body, 2 is a pantograph current collector including a boat body, an upper frame, a lower frame, an insulator, and the like. Numeral 3 is a side wall provided substantially parallel to the left and right sides on the roof of the vehicle end and attached at a maximum height H within the vehicle limit. Both ends of the side wall 3 are installed on the roof of the vehicle body 1 at a mounting angle (inclination angle) θ ₁ . Reference numeral 4 denotes a front and rear wall which is provided between the pair of side walls 3 and at the front and rear positions of the pantograph current collector 2 and is installed at a height h lower than the height H of the side wall 3.

In the method of running a vehicle, one end of the side wall 3 projects forward from the front surface of the front and rear walls 4. The other end of the side wall 3 projects rearward from the front and rear wall 4 at the rear end in the traveling direction.

According to this configuration, the side walls 3 having a sufficient height H provided on both sides on the roof of the vehicle allow the pantograph current collector 2 to emit a spark sound, a sliding sound, and the like during traveling of the vehicle. Can be adequately shielded.

Further, since the inclination angle θ ₂ of the front surface of the front and rear walls 4 is formed large, the separation at the upper end of the upstream front and rear walls 4 becomes large, and the average flow velocity at the position of the pantograph current collector 2 can be reduced. The noise of the pantograph current collector 2 can be reduced. Further, since the height h of the front and rear walls 4 can be reduced in this way, the running resistance can be reduced. Furthermore, since the front and rear walls 4 are arranged between the pair of side walls 3 and the height h of the front and rear walls 4 is made lower than the height H of the side walls 3, the air flow near the top of the front and rear walls 4 is separated. The noise (aerodynamic sound) generated by the side wall 3 can be shielded.

When the end of the side wall 3 does not protrude in the running direction, aerodynamic noise is generated from the end of the front and rear wall 4.
Since the end portions of the side walls 3 project in the traveling direction, the front and rear walls 4
The aerodynamic sound generated from the intersection of the side wall 3 and the side wall 3 can be shielded. Further, since the front and rear walls 4 is shielded by the side walls 3 position rising at a large inclination angle theta ₂ (the intersection between the roof and the front and rear walls 4) in the width direction of the vehicle, it can shield the aerodynamic noise generated from the position Things.

Further, since the inclination angle θ ₁ of the front surface of the side wall 3 is made small, the air resistance can be made small and the generation of noise can be made small. The inclination angle satisfies θ ₁ <θ _{2 as} shown in the figure.

Next, a second embodiment according to the present invention will be described with reference to FIG. In the figure, the same reference numerals as those in the first embodiment denote the same members. The difference of the present embodiment from the first embodiment is that the inclined surface of the front surface of the front and rear wall 5 having a height h installed between the side walls 3 at the front and rear positions of the pantograph current collector 2 is parabolic. It was formed. The parabolic surface has a small inclination angle on the lower end side of the front and rear walls 5, and the inclination angle increases toward the upper end side.

According to such a configuration, the flow of the airflow on the front and rear walls 5 is smoothly directed upward, and the separation of the airflow at the upper ends of the front and rear walls 5 is increased, so that the airflow hits the pantograph current collector 2. The average flow velocity of the air flow can be further reduced. This produces an effect of reducing the pantograph aerodynamic noise. In addition, the aerodynamic noise generated by the front and rear walls 5 can be shielded by the side walls 3 in the same manner as described above, so that noise outside the vehicle can be reduced.

Next, a third embodiment of the present invention will be described with reference to FIG. In the figure, the same reference numerals as those in the first embodiment denote the same members. The first of the present embodiment
The difference from the embodiment is that the front shape of the front and rear walls 6 having a height h installed between the side walls 3 at the front and rear positions of the pantograph current collector 2 is set to an acute angle θ ₄ with respect to the direction perpendicular to the flow of the traveling wind. , to the front tilt angle theta ₂ at the center position in the vehicle width direction at the front and rear walls 6, was gradually changed reduced front angle of inclination so that theta ₂ smaller theta ₃ at both end positions of the front and rear walls That is. As a result, there is an effect that the flow of the traveling wind hitting the front and rear walls smoothly flows in the lateral direction, the air resistance is small, and the average flow velocity at the mounting position of the pantograph current collector 2 is reduced.

Next, a fourth embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIGS. Referring to FIG.
The same reference numerals as those of the embodiment indicate the same members. Differences from the first embodiment of the present embodiment is that the front and rear walls of the front tilt angle has a theta ₂ smaller inclination angle theta ₅ placed in front and rear positions of the side walls 3. According to the experiments performed by the inventor of the present invention, the aerodynamic noise generated from the pantograph current collector 2 and the sound insulation cover of the high-speed railway vehicle is, as shown in FIG. There is a characteristic that the pantograph aerodynamic sound (b) and the sound insulation cover-aerodynamic sound (b) change with the opposite dependence in accordance with the inclination angle θ formed by. As described above, in the case where the horizontal distance L between the front and rear walls of the sound insulation cover and the pantograph current collector is constant, the separation of the airflow at the upper ends of the front and rear walls increases as the front surface inclination angle θ increases, and the pantograph current collector 2 And the aerodynamic noise of the pantograph current collector 2 is reduced.
However, when the front inclination angle θ increases, the aerodynamic noise (b) of the front and rear walls of the sound insulation cover itself increases, and the overall sound (a)
+ (B) cannot be further reduced. FIG. 6 is dimensionless by dividing the horizontal distance L in the front-rear direction of the vehicle from the top of the front and rear walls 7 to the mounting center of the pantograph current collector 2 by the maximum height of the front and rear walls 7 from the roof of the vehicle body. Parameter L
/ H is plotted on the horizontal axis, and the vertical axis shows the change in the flow velocity ratio α obtained by dividing the average flow velocity by the main flow velocity. For this reason, as shown in FIG. 6, by increasing the horizontal distance L / H between the front and rear walls and the pantograph current collector 2, the reduction of the average flow velocity applied to the pantograph current collector 2 is maintained, and the front and rear walls are not changed. Of the sound insulation cover
The aerodynamic noise (b) of the front and rear walls itself can be reduced, and the overall sound can be further reduced. Thus, smaller than the front tilt angle theta ₂ of the front and rear wall 4 of the first embodiment has a front inclination angle of the front and rear walls 7 and theta _5, and the front and rear distance from the top of the front wall to the pantograph current collector 2 Parameter L /
By increasing H from 2 to 4 m to 3 to 5 m, the effect of reducing the average flow velocity at the pantograph mounting position is L /
It is equivalent to the case of H = 2-4 m. As a result, the total sound of the aerodynamic sound generated by the sound insulation cover and the pantograph current collector 2 can be further reduced.

Next, a fifth embodiment according to the present invention will be described with reference to FIG. In the figure, the same reference numerals as those in the first embodiment denote the same members. The first of the present embodiment
The difference from the embodiment is that a notch 9 is provided in the side wall 8 near the fixed portion between the side wall 3 and the front and rear wall 4, as shown in FIG. At this time, when the traveling wind hits the front wall 4 at the front, the flow A at the center of the front wall flows upward as it is, and the flow B near both ends of the front and rear walls 4 passes through the notch 9 and the rear outside of the side wall 8. Led to. For this reason,
Keep the noise reduction effect of the pantograph current collector,
The flow is smooth and the air resistance is reduced.

At this time, wind noise from the notch 9 may be a concern. To deal with this, the edge of the notch may be rounded, or a sound absorbing material may be applied to the inside to reduce the wind noise. Can be reduced.

If the side wall having the maximum height within the vehicle limit from the top of the vehicle body is installed on the vehicle body roof with a certain finite length, the appearance may be deteriorated. For this reason, keep the horizontal distance between the front and rear walls of the sound insulation cover and the pantograph current collector,
By using a structure in which only the side walls attached to both ends in the width direction of the vehicle are extended over the entire length of the vehicle roof, the effect of reducing the average flow velocity due to the separation of the air flow from the upper ends of the front and rear walls is maintained. It is possible to prevent the appearance of the vehicle from deteriorating while maintaining the effect of reducing the aerodynamic noise of the device. At this time, the increase in noise and the increase in air resistance are slight due to the long and narrow side wall having a small resistance in the vehicle traveling direction.

[0021]

According to the present invention, it is possible to provide a sound insulation device having low air resistance and low noise.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a pantograph sound insulation device according to the present invention.

FIG. 2 is a perspective view showing a second embodiment of the pantograph sound insulation device according to the present invention.

FIG. 3 is a perspective view showing a third embodiment of a sound insulation device for a pantograph according to the present invention.

FIG. 4 is a perspective view showing a fourth embodiment of the pantograph sound insulation device according to the present invention.

FIG. 5 is a graph showing the relationship between the noise level and the front inclination angle of the front and rear walls.

FIG. 6 is a graph showing a relationship between a pantograph mounting position and an average flow velocity.

FIG. 7 is a perspective view showing a fifth embodiment of the sound insulation device for a pantograph according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Body, 2 ... Pantograph current collector, 3 ... Side wall, 4 ...
Front and rear walls.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Morinari Higashi-Toyoi 794, Osamu Hata, Shimomatsu, Yamaguchi Prefecture Inside the Kasado Plant, Hitachi, Ltd. (72) Go Naoki Okumoto 794 Higashi-Toyoi, Shimomatsu, Yamaguchi Company Hitachi Ltd. Kasado Factory (72) Inventor Masato Okazaki 794 East Toyoi, Kudamatsu City, Yamaguchi Prefecture Stock Company Hitachi Ltd. Kasado Factory (72) Hitoshi Tsuruta 794 Toyoi, Higashitoyo, Yamaguchi Prefecture Hitachi Co., Ltd. Kasado Factory

Claims (4)

[Claims] 1. A pair of side walls provided in parallel in a traveling direction of a vehicle, and a pair of front and rear walls provided at front and rear ends of the side walls, wherein the height of the front and rear walls is lower than the height of the side walls. , Sound insulation device for current collector. 2. The method according to claim 1, wherein one end side of the side wall in the traveling direction is a front side,
The side wall on the one end side projects to the front side with respect to the front and rear walls, and the side wall on the other end side in the traveling direction projects to the rear side in the traveling direction with respect to the front and rear walls. Sound insulation device for current collector. 3. A pair of side walls provided in parallel in the traveling direction of the vehicle, and a pair of front and rear walls provided at front and rear ends of the side walls, wherein one end side of the side wall in the traveling direction is a front side. The front side of the front and rear walls on the one end side is provided with an arcuate shape so that the center portion in the width direction of the vehicle body protrudes forward from the end side, and the other end side in the traveling direction is forward. The front side of the front and rear walls at the other end side is provided in an arc shape so that the center portion in the width direction of the vehicle body projects more forward than the end side. Sound insulation device for electrical equipment. 4. The current collecting device according to claim 3, wherein the front and rear walls have inclination angles on the front surface side that are smaller on the end portion side than on the inclination angle of the central portion. Sound insulation device.