JPH0898306A - Windbreaking cover of current collector - Google Patents

Abstract

PURPOSE: To relax a pressure change in the travelling of a vehicle, which stems from the windbreaking cover of a current collector mounted on the roof of a rolling stock. CONSTITUTION: A windbreaking cover 1 surrounding a current collector 10 on a vehicle roof 31 is constituted of a slope part 2 having a gradual grudient rising toward the current collector and a side wall 3 provided in the side position of the current collector 10, and a notch 4 is formed in the position of interfering with the region of the insulating separation R of the current collector in the side wall 3. Further, as occasions demand, a noise insulating wall 5 is provided on the outside of the notch 4 in the side wall 3 and outside the insulating separation R of the current collector 10. Thereby, the pressure change in the travelling can be reduced by the reduction of a projected plane and a noise level can be reduced by the noise insulating wall 5. As a result, the speedup of a rolling stock can be realized without deteriorating the environment along a railway line.

Description

Detailed Description of the Invention

[0001]

[Industrial application] To reduce aerodynamic noise generated from the current collector installed on the roof while the railway vehicle is running,
A windbreak cover is usually installed around the current collector. However, while the vehicle is traveling, the windshield cover causes pressure fluctuations, which adversely affects the surroundings of the vehicle body. The present invention aims to alleviate the pressure fluctuation caused by such a windbreak cover, and thus contributes to the realization of high-speed running of a train.

In the present specification, "front, rear, left,"
"Right" means front, rear, left, and right with respect to the traveling direction of the vehicle.

[0003]

2. Description of the Related Art Various attempts have been made in the past to mitigate the adverse effects on the environment along the railway line, especially noise, as much as possible in increasing the speed of railway vehicles. The applicant has focused on a current collector installed on the vehicle roof as a noise source while the vehicle is running, and in order to reduce aerodynamic noise generated from the current collector,
Measures are taken from the following two sides. That is, there are measures by improving the shape of the current collector itself and measures by improving the structure of the windproof cover surrounding the periphery of the current collector. For the shape of the current collector, we adopted a structure in which a wing-shaped current collector was supported by columnar support parts so that it could be raised and lowered. It is composed of side walls installed on both the left and right sides of the electric device.

FIG. 13 shows an example of a structure in which the two conventional measures which are considered to be effective in reducing the aerodynamic noise generated from the current collector 10 installed on the roof 31 of the vehicle 30 are combined. So, in this conventional example,
The current collector 10 is composed of a wing-shaped current collector boat 11 provided with horns 12 that are curved and projected to the left and right sides, and a columnar support portion 13 that supports the horn 12 so that the windshield cover 20 can move up and down.
Is composed of a slope portion 21 formed of a gentle slope that is long in the front-rear direction and side wall portions 22 erected on both right and left sides of the current collector 10.

[0005]

By the way, railway cars are
Since the vehicle runs while pushing away air at the front of the vehicle, pressure fluctuations occur around the vehicle body due to wind pressure, which causes vibrations and other undesirable effects on both the own vehicle and other vehicles when passing by an oncoming train. suffer. However, the conventional windbreak cover 20 has a large degree of pressure fluctuation, and therefore, it is difficult to apply the windbreak cover 20 to high-speed traveling exceeding 300 km / h. The reason is as follows.

As a means for reducing the pressure fluctuation generated due to the windbreak cover 20 when the vehicle is traveling, the area of the windbreak cover 20 viewed from the front (hereinafter referred to as "projection area") is as small as possible. And to keep the rate of change of the cross-sectional area from the tip of the windbreak cover 20 to the maximum cross-sectional area position (usually the position of the current collector 10 at the center) constant and as small as possible.

Regarding the former projected area, as shown in FIG. 14, the inner surface of the windbreak cover 20 and the horn 12 of the current collector 10.
In order to prevent the occurrence of a landfall accident due to a high voltage current between the insulator 14 and the insulator 14 supporting the current collector 10, a sufficient distance (hereinafter referred to as “insulation separation”) can be secured between the two. Generally required. Specifically, the current collector 10
Current collector 1 in the lowered position when not in use
It is required to provide an insulation gap R of at least 300 mm or more between the tip of each of the left and right horns 12 and the tip of the insulator 14 and the inner surface of the windbreak cover 20. As a result, the conventional windbreak cover 20 has its maximum width dimension set to a large dimension approximately equal to the vehicle body width dimension (about 3200 mm), and the projection area inevitably becomes large (about 3. 25
m ² ).

If it is desired to reduce the projected area of the windbreak cover 20 to reduce the pressure fluctuation to a desired degree, the maximum width of the windbreak cover should be reduced, or
The height dimension must be reduced. In the former case, that is, when the maximum width dimension of the windbreak cover 20 is reduced, FIG.
As shown in FIG. 4, a part of the windbreak cover 20 will interfere with the insulation separation area when the current collector 10 is in the lowered position, and as a result, even if suppression of pressure fluctuation can be realized, It is not suitable for practical use in terms of safety.

In the latter case where the height of the windbreak cover 20 is lowered, there is a concern that aerodynamic noise will increase due to the high-speed airflow that is likely to collide with the current collector 10, so that aerodynamic noise is relatively small. Even if the airfoil current collector 10 is adopted,
There is a limit to the reduction in height of the windbreak cover 20.

Regarding the rate of change of the cross-sectional area of the waterproof cover, which is another condition related to the pressure fluctuation, a method of lengthening the slope portion 21 can be considered in order to keep it constant and small. However, due to the restriction that the windbreak cover 20 is installed on the roof of the vehicle, the formation length of the slope portion 21 is limited, and the pressure fluctuation has not yet been reduced to a practical level. . On the contrary, it is also possible to make the rate of change of the cross-sectional area constant and small by making the length of the slope portion 21 constant and making the maximum width dimension and maximum height dimension small, but the drawback in this case is As described above.

[0011]

DISCLOSURE OF THE INVENTION The present invention is a windbreak cover, which was devised in view of the above-mentioned conventional technical problems, and is characterized by collecting from a vehicle roof formed before and after a current collector. A slope portion having a gentle upward slope toward the current collector and a side wall portion provided at a side position of the current collector, and a notch is formed in a portion of the side wall portion that interferes with an insulation separation area of the current collector. That is what I formed.

Further, as an application example of the windproof cover, it is possible to adopt a structure in which a sound insulation wall is provided outside the cutout in the side wall portion and outside the insulation separation of the current collector. In this case, the sound insulation wall is provided with a windshield. It is also possible to adopt a structure in which the cover side wall portion projects obliquely upward from a base portion or an intermediate portion.

Further, it is possible to adopt a structure in which inclined surfaces for jumping up the air flow are formed at the front and rear positions near the current collector in the slope portion of the windbreak cover.

[0014]

In the windproof cover according to the present invention, the side wall portion is provided with a notch to avoid interference with the insulation separation region of the current collector, and therefore the lateral width dimension of the side wall portion is set smaller than the conventional one. Thus, the pressure fluctuation caused by the windbreak cover while the vehicle is traveling can be reduced.

By providing a sound insulation wall at a position outside the notch of the side wall portion, propagation of aerodynamic sound to the side of the running vehicle is suppressed.

Further, when the inclined surface is formed in the front and rear position near the current collector in the slope portion of the windbreak cover, the air flow in the front region of the current collector can be jumped up, so that the current collector can be used. The velocity of the impinging air stream is reduced to improve the aerodynamic noise reduction effect.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings showing the embodiments. In each drawing, the same reference numerals as those used in the drawings showing the conventional example indicate the same members or structures.

[First Embodiment] FIG. 1 shows a first embodiment of a windbreak cover 1 according to the present invention. The basic shape of the windbreak cover 1 is the same as the conventional one, and the slope portions 2 and 2 formed on the front and rear of the current collector 10 of the vehicle roof 31 and the side walls erected on both left and right sides of the current collector 10. It consists of parts 3 and 3. The slope of the slope portion 2 is about 10 to 20.
Set to °. In the present embodiment, the wing-shaped structure with less aerodynamic noise is shown as the current collector 10, but a pantograph-type current collector with a conventional rhomboid link mechanism is adopted according to the running conditions of the vehicle. It does not prevent you from doing it.

There are two features of the windbreak cover 1 of the present invention. One is that the maximum width dimension of the windbreak cover 1 is shorter than that of the conventional one, and the other is that the current collector 10 on the side wall portion 3 is in the lowered position. In the case where the insulation gap R interferes, the notch 4 is formed.
Is formed. In this embodiment, the maximum width dimension of the windbreak cover 1 is about 2000, compared with the conventional width of about 3200 mm.
As a result, the projected area of the windbreak cover 1 could be reduced to about 1.44 m ² compared to about 3.25 m ² in the related art.

Further, by forming the notch 4 as shown in the side wall portion 3, the side wall portion 3 and the horn 1 of the current collector 10 are formed.
The insulation gap R is secured between the two. In this embodiment, in order to ensure safety, the distance from the tip of the horn 12 when the current collector 10 is lowered is about 400 mm.
The side wall portion 3 in the range is cut out.

[Second Embodiment] In the first embodiment, since the notch 4 is formed in the side wall portion 3 of the windbreak cover 1,
There is a concern that ground noise may increase due to leakage of aerodynamic noise generated from the current collector 10 when the vehicle travels to the side of the vehicle body.
Therefore, as shown in FIG. 2, it is conceivable to install the sound insulation wall 5 at a position outside the cutout 4 of the windbreak cover 1 and outside the insulation separation R of the current collector 10. The height of the sound insulation wall 5 is preferably set to be larger than or equal to the maximum height of the main body of the windbreak cover 1 within a range not exceeding the vehicle limit.

Although the drawings show that the sound insulation wall 5 is manufactured separately from the main body of the windbreak cover 1,
It does not prevent making this one.

By providing the sound insulation wall 5, although the projected area of the windbreak cover 1 is slightly increased as compared with the first embodiment, it is suppressed to about 2.1 m ^{2 in} this embodiment. This value is about 65% of that of the conventional example, and it is possible to reduce the pressure fluctuation to a practically sufficient degree.

[Third Embodiment] When the soundproof wall 5 is provided on the windbreak cover 1, the soundproof wall 5 is provided as shown in FIG.
It can also be formed so as to project obliquely upward from the base of the side wall portion 3. In this case, needless to say, the sound insulation wall 5 is located outside the insulation separation R of the current collector 10.

According to this structure, the projected area can be reduced as compared with the second embodiment, so that the effect of reducing the pressure fluctuation is further improved.

In the case of this embodiment, the sound insulation wall 5
As described above, it may be integrated with the main body of the windbreak cover 1 or may be a separate body.

Although not shown, a structure in which the sound insulation wall 5 is projected obliquely upward from an intermediate height position on the side wall portion 3 of the windbreak cover 1 (for example, a position directly below the notch 4) is also conceivable.

[Fourth Embodiment] As shown in FIG. 4, an angle (for example, about 45 °) larger than the slope of the slope portion 2 is provided at the front and rear positions near the current collector 10 in the slope portion 2 of the windbreak cover 1. It is known that the level of the aerodynamic sound generated from the current collector 10 can be reduced by forming the inclined surface 6. The inclined surface 6 has a function to bounce upward the air flow in the front region of the current collector 10 when the vehicle is traveling, and to reduce the speed of the air flow that collides with the current collector 10, and as a result, the noise level is reduced. Results in reduction of Therefore, the structure in which the inclined surface 6 is formed on the windbreak cover 1 is considered to be particularly useful when the conventional pantograph type current collector 10 is adopted.

[Wind Tunnel Experiment 1] The effect of mitigating pressure fluctuations according to the present invention was confirmed by a wind tunnel experiment in the manner shown in FIG.
The experimental method is as follows: the windbreak cover according to the present invention shown in FIG.
The conventional windbreak cover 1 shown in FIG. 8 and the standard box windbreak cover 50 for the conventional pantograph type current collector 51 shown in FIG.
1/20 car body model D equipped with each model E is installed on a ground plate L supported at an appropriate height position on the wind tunnel floor C, and pressure measurement is performed at one side position of the car body model D. The side plate 40 having a large number of openings 41 is arranged, and an air flow of a constant velocity is sent from the wind tunnel device to measure the pressure distribution near the side surface of the vehicle body model D. However, the current collector model and Fig. 1
The notch of the model corresponding to the windbreak cover of is omitted.

As shown in the drawing of the side plate 40 in FIG. 6, the pressure is measured by 75 mm from the surface of the ground plate L (actual vehicle conversion 1.
5m) and 150mm (3.0m in terms of actual vehicle). The distance between the openings 41 is about 30mm at the center of the vehicle, and the distance between the openings 41 is 60mm toward the front and rear ends of the vehicle.
Pitches that expand to mm, 75 mm, and 150 mm are adopted. As shown in (D) of the figure, each opening 41 is a pore 41 having an inner surface facing the vehicle body model D of about 1 mm.
A vinyl pipe 42 having an outer diameter of about 5 mm and an inner diameter of about 2 ± 1 mm is inserted and fixed on the outer surface side. And as shown in FIG.
Each pipe 42 is connected to a pressure converter 44 by a vinyl tube 43, and the measured pressure converted into an electric signal by the pressure converter 44 is adjusted by an amplifier 45 and then led to a data recorder 46, which then outputs a chart. Recorder 47
And output to a personal computer 48, a printer 49, etc. for tabulation processing to draw and plot.

The side plate 40 is made of wood or a synthetic resin such as vinyl chloride or ABS and has a height of about 210 m.
m. This is about 4.1 m when converted into an actual vehicle, which corresponds to almost the height position of the vehicle roof.

The measurement results are shown in the graphs of FIGS. 9 and 10. In each graph, the vertical axis represents the pressure coefficient Cp [Cp =
P / (1 / 2ρV ² ): P is pressure, ρ is air density, and V is wind speed. ], The distance (unit: m) from the center of the windbreak cover is shown in the actual vehicle in the horizontal axis.

As is clear from the graphs, the vehicle equipped with the windproof cover having a small projected area according to the present invention has a maximum positive pressure and a maximum negative pressure in the pressure distribution as compared with a vehicle equipped with a conventional windproof cover. It can be seen that the difference between is smaller. From this, it is confirmed that the windbreak cover according to the present invention is effective in alleviating the pressure fluctuation caused by running of the vehicle.

[Wind Tunnel Test 2] In the windbreak cover having a small projected area according to the present invention, a noise level is different between the case where the sound insulation wall shown in FIG. 1 is not provided and the case where the sound insulation wall shown in FIG. 2 is provided. Since it can be considered, this was confirmed by the test procedure shown in FIG. The test method is the same as the wind tunnel test 1, in which a one-twentieth body model D is installed on the ground plate L, and the wing-shaped current collector model F and the windproof cover without the sound insulating wall in FIG. A model (however, notches are omitted) or a windbreak cover model E having a sound insulation wall shown in FIG. 2 is attached. Then, the microphone M is installed at the same height (about 250 mm) as the current collector model F and at a position where the distance g = about 1250 mm from the center of the current collector model F to the side, and about 50 m / sec from the wind tunnel N. Aerodynamic noise is measured by sending wind (about 180 km / h). The measurement results are shown in the graph of FIG.

In the graph, the vertical axis represents the noise level converted to the actual vehicle (unit: dB), the horizontal axis represents the 1/3 octave band frequency (unit: Hz), and Δ is the noise level without the sound insulation wall, □ Indicates the noise level when a sound insulation wall is provided, and × indicates the background noise level.

As can be seen from the graph in the figure, the windproof cover having the sound insulation wall has a reduction in the noise level in most frequency regions as compared with the one having no sound insulation wall, and particularly in the high frequency band. Is excellent in

[0037]

As is apparent from the above description, the windbreak cover according to the present invention reduces pressure fluctuation during traveling due to the reduction of the projected area, and the sound insulation wall is erected as necessary. By doing so, the noise level can be reduced. Therefore, the present invention makes a great contribution to the realization of speeding up of railway vehicles exceeding 300 km / h without deterioration of the railway environment.

[Brief description of drawings]

FIG. 1 relates to a first embodiment of the present invention,
(A) is a perspective view of a windbreak cover installed on the vehicle roof,
(B) is a front half-cut sectional view of the wind-guard cover.

FIG. 2 relates to a second embodiment of the present invention,
(A) is a perspective view of a windbreak cover installed on the vehicle roof,
(B) is a front half-cut sectional view of the wind-guard cover.

FIG. 3 is a front half-cut sectional view of a windbreak cover according to a third embodiment of the present invention.

FIG. 4 relates to a fourth embodiment of the present invention,
(A) is a perspective view applied to the windproof cover of the first embodiment,
(B) is a perspective view applied to the windbreak cover of the second embodiment.

5A and 5B are drawings for explaining the procedure of the wind tunnel test 1, in which FIG. 5A is a side view of the vehicle model and FIG. 5B is a front sectional view of the vehicle model.

FIG. 6 shows a side plate used in the wind tunnel test 1,
(A) is a side view, (B) is a plan view, (C) is a front view,
(D) is a cross-sectional view taken along line dd of FIG.

FIG. 7 is a schematic diagram showing an example of a system for processing measured values obtained from the wind tunnel test 1.

FIG. 8 is a perspective view showing a standard box-shaped windproof cover for a conventional pantograph-type current collector.

FIG. 9 is a graph of measurement results of the wind tunnel test 1, showing measured values at a height of 3 m (converted into an actual vehicle).

FIG. 10 is a graph of measurement results of the wind tunnel test 1, showing measured values at a height of 1.5 m (converted into an actual vehicle).

FIG. 11 is a diagram showing a procedure for performing a wind tunnel test 2,
(A) is a side view of the vehicle model, (B) is a plan view of the vehicle model.

FIG. 12 is a graph showing measurement results of wind tunnel test 2.

13A and 13B are a side view of the entire vehicle and a perspective view of a windshield cover installed on a vehicle roof, showing a conventional example.

FIG. 14 is a front half-cut sectional view showing a conventional windbreak cover.

FIG. 15 is a front half-cut cross-sectional view illustrating a defect of a conventional windbreak cover.

[Explanation of symbols]

 1 Windproof cover 2 Slope part 3 Side wall part 4 Notch 5 Sound insulation wall 6 Inclined surface 10 Current collector 11 Current collector 12 Horn 13 Support part 14 Insulator R Insulation separation

Claims (4)

[Claims] 1. A windbreak cover surrounding a current collector installed on the roof of a railway vehicle, which has a gentle upslope from the vehicle roof formed before and after the current collector toward the current collector. A collector comprising a slope portion and a side wall portion provided at a lateral position of the current collector, wherein a notch is formed in a portion of the side wall portion that interferes with an insulation separation region of the current collector. Windproof cover for electrical equipment. 2. A sound insulation wall is provided outside the notch in the side wall portion and outside the insulation separation of the current collector.
Windproof cover for the current collector described in. 3. The windbreak cover for a current collector according to claim 2, wherein the sound insulation wall projects obliquely upward from a base portion or an intermediate portion of a windshield cover side wall portion. 4. The current collector according to claim 1, wherein inclined surfaces for jumping up an air flow are formed at front and rear positions near the current collector in the slope portion. Windproof cover.