JP4614745B2 - Snow accretion prevention device for high-speed railway vehicles - Google Patents

Description

  The present invention mainly relates to a snow accretion prevention device for a high-speed railway vehicle that travels at a high speed.

  Conventionally, when a train travels at a high speed in a heavy snowy area in winter, it is known that snow rises and adheres to the lower part of the floor of the vehicle, causing various problems. For example, snow that adheres to the lower part of the vehicle floor may cause ballast to jump up when it falls to the ground due to train running wind or melting in a warm area, damaging the own vehicle or causing damage to the off-site line. There is a problem that brings.

  These problems are as follows: (i) When entering a warm area from a heavy snow area, the snow adhering to the heavy snow area will easily melt and fall as a lump, and (ii) the higher the speed, the more likely the snow will soar. It is likely to occur on the condition that the ballast is likely to jump up when the attached snow falls.

  Therefore, conventionally, as shown in FIG. 20, in the hollow concave portion 104 formed between the front and lower floor portions 101 and 102 and positioned on the upper portion of the carriage 103, a portion to which snow is likely to adhere, that is, end closing of the front and lower floor portions is blocked. Attempts have been made to attach dummy members 107 and 108 having a triangular cross section to the plates 105 and 106, and to make it difficult for snow to adhere to these parts by the presence of the dummy members. A snow accretion prevention device is already known in which a guide plate is provided in front of the traveling direction that receives the head wind, and the air that is guided by the guide plate is blown off by the air (see, for example, Patent Document 1).

  In addition, the amount of snow that adheres to the under-floor equipment of the vehicle is small on the side and bottom and more on the front in the direction of travel. Therefore, as a measure to express the risk of falling snow, the thickness of snow attached to the surface facing the direction of travel is measured. It is most useful to do. Therefore, the speed of the train is obtained from the time until the next wheel blocks the light beam after the predetermined wheel of the rail vehicle to be measured interrupts the light beam and the known wheel axle distance. The length of the underfloor equipment to which snow has adhered is determined from the time that the underfloor equipment to which the snow has adhered interrupts the light beam and the speed of the train, and the length of the underfloor equipment to which the snow has adhered and the length of the known underfloor equipment, etc. A method for obtaining the thickness of snow attached to an underfloor device or the like from the difference has been proposed (see, for example, Patent Document 2). By this method, snow adhesion can be monitored at any time, the speed can be increased to the limit speed at which snow adheres, and unnecessary slowing down can be reduced in the snow-free section.

  Furthermore, in order to secure a regular operation schedule by reducing the amount of snow on the vehicle body and eliminating human work, an inflatable and inflatable bag body attached to the underfloor equipment cover at the bottom of the vehicle body, and the bag body There has been proposed a snow accretion prevention apparatus for a railway vehicle that includes a supply / discharge mechanism that periodically supplies and discharges fluid to expand and contract the bag (see, for example, Patent Document 3). According to this device, the snow attached to the surface of the bag can be removed by periodically supplying and discharging the fluid by the supply / discharge mechanism to expand and contract the bag.

In addition, in order to prevent daily snowfall by taking simple measures within a short time, and to be able to remove it easily even if it snows somewhat, it is directed toward the lower inside of the railway vehicle. an internal spray means attached to the frame via the extendable telescopic arms, a surface spray means mounted on the frame via the fixing arm towards the lower part of the railway vehicle, the internal spray means and a surface spray There is also proposed one provided with a chemical air supply means for injecting a snow accumulating agent or compressed air from the means (see, for example, Patent Document 4).

Specifically, a chemical solution (snow prevention agent) that has an effect of preventing snow accumulation is preliminarily sprayed from the outside of the vehicle toward the lower part of the vehicle and the inner part of the lower part of the vehicle at the waiting place of the train other than the main line such as the side line of the starting station. To prevent snow and dust from adhering. At the same time, for the train after traveling, the effect of the anti-snowing agent can be obtained by injecting compressed air from both outer sides of the vehicle toward the lower part of the vehicle and the inner part of the lower part again in the standby place. Together with this, it is possible to easily remove snow.
Japanese Utility Model Publication No. 02-004855 (column 2, lines 2 to 12 and FIG. 2) Japanese Unexamined Patent Publication No. 07-027522 (paragraph numbers 0006 and 0007) JP 2002-67956 A (paragraph numbers 0006 to 0010) JP 200451020 A (paragraphs 0010 to 0011 and FIG. 7)

  The streamline, velocity distribution, and pressure distribution before attaching the dummy member are as shown in FIGS. 21 to 23. However, if only the dummy members 107, 108 are attached, the streamline, velocity distribution, and pressure distribution are large. There is no change, and air flows into the hollow recess 104, so that a sufficient snow-preventing effect cannot be obtained. FIGS. 21 to 23 are diagrams showing the results of simulation of streamlines, velocity distributions, and pressure distributions by numerical fluid analysis (CFD) for various shapes around the carriage based on the method described later.

  Moreover, according to the technique of patent document 1, since air may be guided in a hollow recessed part by a guide plate and snow may be caught in the air, sufficient snow accretion prevention effect cannot be anticipated.

  According to the technique of Patent Document 2, it is possible to monitor the attachment of snow at any time, and it is possible to improve the speed to the limit speed at which snow adheres, or to reduce unnecessary gradual travel in the snow-free section. The effect of preventing snow accretion is insufficient. In addition, since it is limited in speed, it cannot be applied to railway vehicles intended for high-speed travel.

  According to the technique of Patent Document 3, the bag body is expanded and contracted by periodically supplying and discharging the fluid by the supply and discharge mechanism, so that the snow accretion prevention device becomes large and causes a cost increase. In addition, the technique of Patent Document 4 also makes the whole apparatus large and disadvantageous in terms of cost.

  In order to reduce the amount of snow on the trolley around the bottom of the vehicle floor, the inventors conducted simulations on various shapes around the trolley by numerical fluid analysis (CFD). Developed the shape around the bogie to prevent snow from sticking.

  An object of the present invention is to provide a snow accretion prevention device for a high-speed railway vehicle that has a simple structure and is less likely to have snow around the carriage even when traveling at high speed.

The invention according to claim 1, comprising a hollow recess upper part of the carriage is located between the floor closing plate under the floor portion located around, high-speed rail in which the front and rear of the hollow recess is partitioned by the end closing plate In the snow accretion prevention apparatus for a vehicle, the velocity of air that protrudes downward and enters the hollow recess in the vicinity of the connecting portion with the bottom closing plate that extends in the horizontal direction at the lower part of the front floor , or A dummy member functioning as a barrier for reducing the pressure is provided.

  In this way, the dummy member functioning as a barrier hinders the flow of air (running wind) and reduces the speed or pressure of the air entering the hollow recess. The air contained) makes it difficult to snow around the carriage.

The invention of claim 2 has a hollow recess underfloor closing of the plates stand car top floor lower you located before and after positions, high-speed rail in which the front and rear of the hollow recess is partitioned by the end closing plate In the snow accretion prevention apparatus for a vehicle, air is guided in a direction other than the hollow concave portion projecting downward near a connecting portion of the front lower floor , which is an underfloor closing plate extending in the horizontal direction and connected to the end closing plate. It functions as an air guide part.

  In this way, the air (running wind) flowing toward the rear is directed in a direction other than the hollow concave portion (the hollow concave portion is the rear side) by the dummy member functioning as an air guide portion on the lower side of the front side (upstream side of the running wind). Therefore, the amount of air flowing into the hollow recess (the flow of air) is greatly reduced. Therefore, the air containing snow hardly enters the hollow recess, and snow is prevented from landing on the rear lower end (in the hollow recess).

  In this case, as described in claim 3, the dummy member has an inclined surface portion that protrudes downward as the rear of the vehicle travels, and guides air downward. it can.

  If it does in this way, the flow of air (running wind) will collide with the inclined surface part of a dummy member, and it will be guided toward slanting back and downward. Therefore, it becomes difficult for the air flow to enter the hollow recess.

  According to a fourth aspect of the present invention, the cross-sectional chevron shape has a rear inclined surface portion that continuously decreases from the rear end of the inclined surface portion, and the amount of downward protrusion gradually decreases. It is desirable to be provided over. In this case, it is possible not only to provide one member over the entire vehicle width direction but also to provide a plurality of members over the entire vehicle width direction so as to contact each other.

  In this way, since the members extend over the entire vehicle width direction, the air flow does not enter the hollow recesses over the entire vehicle width direction.

As described above, the invention according to claims 2 to 4 includes a dummy member that guides air in a direction other than the hollow recess in the vicinity of the connecting portion with the end closing plate , which is an underfloor closing plate in the lower front floor. By providing this dummy member as a wall that blocks the flow of air (running wind) (including snow particles), the air flowing backward by this dummy member is directed in a direction other than the hollow recess (the hollow recess is rearward). Therefore, it is guided to the lower side or the left and right sides other than the rear), and the amount of air flowing into the hollow recess (air flow) is greatly reduced, and it is attached to the rear underside end of the floor (within the hollow recess). It is designed to prevent snowing. However, by providing such a dummy member, the mainstream under the floor and the snow particles contained therein are separated from the vehicle, the amount of snow landing on the bogie body is reduced, and the end due to wheel rotation by reducing the snow particle inflow around the wheels is reduced. Although it is possible to reduce the amount of snow on the partial closing plate, it is difficult to prevent all of the snow on the end closing plate.

  Therefore, as described in Patent Document 4, it is conceivable to provide a heater for the end closing plate and melt the snow attached to the end closing plate using the heat generated by the heater. However, as shown in FIGS. 18 and 19, the end closing plate 111 has four bone members 112a to 112d provided in parallel in the longitudinal direction on the inner side, and upper and lower bone members 112e extending in the vehicle width direction with respect to them. 112f is provided. Therefore, heaters cannot be provided in the portions (range W1) where the bone members 112e and 112f are provided, and the planar heaters 113a to 113a are only provided in portions where the bone members 112a to 112f are not provided. 113k cannot be provided.

If the dummy member has a hollow shape in the portion where the heater cannot be provided by such an end closing plate, a heater can be provided in the hollow interior, so a hollow dummy member (hollow dummy member) and With the combined use with the heater, the structure as described in claim 5 makes it possible to make it difficult for snow to adhere even when traveling at high speed with a simple structure.

  The invention of claim 5 has a hollow recess in which the upper part of the carriage is located between the underfloor closing plates at the lower part of the floor, and a heater is provided on the inner surface side of the end closing plate that partitions the front and rear of the hollow recess. In the snow prevention device for a high-speed railway vehicle, a hollow dummy member that protrudes downward is provided along the vehicle width direction in the vicinity of the connecting portion with the end closing plate that is the under floor closing plate of the lower floor, The hollow dummy member is provided with a heater for heating the vicinity of the connecting portion between the underfloor closing plate and the end closing plate. Here, as the heater, a planar heater or a heater made of a conductive coating (for example, see Japanese Patent Publication No. 7-15830) is advantageous in terms of space, but the surface in the vicinity of the connecting portion is at a necessary temperature from the inside. Any heater can be used as long as it can be heated up to.

  If it does in this way, the snow provided to the end part closing board in general will be reduced by the heater provided in the inner surface side of the end part closing board. In addition, snowfall on the carriage and snowfall due to the wheel rotation attraction speed are reduced by a hollow dummy member functioning as a snowfall dummy, and snowfall on the hollow dummy member is reduced by a heater. As described above, the combined use of the hollow dummy member and the heater provides a higher snowfall reduction effect.

  According to a sixth aspect of the present invention, a bone member may be provided on the inner surface near the connecting portion between the underfloor closing plate and the end closing plate.

  In this way, the heater can be provided also in the portion where the bone member is provided on the inner surface side in the vicinity of the connecting portion between the underfloor closing plate and the end closing plate, which is advantageous in obtaining a snow accretion reducing effect. It becomes.

  As described in claim 7, the hollow dummy member functions as a barrier that reduces the speed or pressure of air entering the hollow recess or an air guide that guides air in a direction other than the hollow recess. It is desirable that

  In this way, the hollow dummy member functions as a barrier that reduces the speed or pressure of air entering the hollow recess or as an air guide that guides air in a direction other than the hollow recess. Intrusion of air containing snow particles can be avoided, and this is advantageous in obtaining the effect of reducing snow accretion in combination with the heating by the heater.

As described above, the inventions according to claims 1 to 4 are the underfloor closing plate extending in the horizontal direction at the lower portion of the front floor, and projecting downward and positioned on the rear side in the vicinity of the connecting portion with the end closing plate. A dummy member that functions as an air guide part (or a dummy member that functions as a barrier) that guides air in a direction other than the hollow recess is provided so that the amount of air flowing into the hollow recess (air flow) is greatly reduced. As a result, air containing snow particles hardly penetrates into the hollow recess, making it difficult for snow to adhere around the carriage. Therefore, when the snow attached to the lower part of the vehicle floor (end blockage plate, etc.) falls to the ground due to train running wind or melting in a warm area, the ballast is lifted up, and the own vehicle may be damaged and the vehicle may be damaged. It is possible to avoid causing damage to the railway line.

  In the inventions according to claims 5 to 7, a higher snow accretion reduction effect can be obtained by the combined use of the hollow dummy member and the heater.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
1 is a side view of a lower portion of a high-speed railway vehicle to which a snow accretion prevention device for a high-speed railway vehicle according to the present invention is attached, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, and FIG. FIG.

  As shown in FIGS. 1 to 3, the vehicle body 1 of the high-speed railway vehicle according to the present invention includes a hollow recess S in which an upper portion of a carriage 4 including wheels 4 a is positioned between front and rear floor lower portions 2 and 3. Has been. The left and right sides of the hollow recess S are separated from the lateral external space by the cover member 5. And the front and back of the hollow recessed part S are partitioned off by the edge part closing plates 2a and 2b extended in a perpendicular direction.

Dummy members 11 and 12 functioning as air guide portions for guiding air downward (toward the road surface) within the vehicle limit L are provided on the underfloor closing plates 2b and 3b of the front and rear floor lower portions 2 and 3, respectively. It provided detachably over by the. The dummy members 11 and 12 are characterized in that a dummy member that also functions as a barrier for reducing the speed or pressure of air entering the hollow recess S is provided.

  Here, the reason why the dummy members 11 are provided on the underfloor closing plates 2b and 3b of the front and lower side floor lower portions 2 and 3 is that the high-speed railcar travels in both the front and rear directions, and they are attached symmetrically. It has been. The material of the dummy member 11 is not limited to metal, and a synthetic resin material such as FRP can also be used. In addition, it is possible to attach and detach because it becomes air resistance when snow does not fall, and it is not necessary to install it so that it can be removed and when it is damaged or deformed, it can be easily replaced It is.

  The dummy member 11 of the front lower floor portion 2 is hollow, and is formed by bending a flat plate into a cross-sectionally U-shape, and a first slope in which a downward projecting amount gradually increases rearward in the vehicle traveling direction. It has the surface part 11a and the 2nd inclined surface part 11b from which the protrusion amount to the downward direction becomes small gradually toward the back from the rear end of this 1st inclined surface part 11a. A reinforcing portion 11c having a U-shaped cross section is provided above the both inclined surface portions 11a and 11b so that the reinforcing portion 11c cannot be clearly seen from the outside. And the attaching part 11d provided in a row by the edge part of the 2nd inclined surface part 11b and extended upwards is being fixed to the edge part closing plate 2a which comprises the hollow recessed part S with the volt | bolt. The reinforcing portion 11c is fixed to the lower floor 2 with bolts.

  Further, the dummy member 11 extends over the entire width direction of the hollow recess S and is configured to function as a barrier when air enters the hollow recess S.

  If comprised as mentioned above, the air (running wind) which flows toward the back from the front of a vehicle will be guided below along the 1st inclined surface part 11a of the dummy member 11 in the vehicle center vicinity. Also, in the vicinity of the left and right sides of the vehicle, a part of the air is guided downward along the first inclined surface portion 11a of the dummy member 11, and the side of the vehicle is open, so the remaining air Is discharged to the side of the vehicle.

  As a result, the air (including snow particles) trying to enter the hollow recess S is obstructed by the dummy member 11 and guided in a direction other than the hollow recess S, so that it hardly enters the hollow recess S. become. Moreover, even if it penetrate | invades, since the speed distribution and pressure distribution by the air are reduced significantly compared with the conventional one so that it may mention later, it is hard to adhere snow.

Therefore, since the snow hardly adheres to the end closing plates 2b and 3b, when the snow adhering to the lower part of the vehicle floor (end closing plate, etc.) falls to the ground due to the train running wind or melting in a warm place, the ballast It is possible to avoid problems such as damaging the own vehicle and damaging the passing vehicle or causing damage to the railroads outside the site.

Subsequently, a numerical fluid analysis performed to confirm the effect when the dummy member is provided will be described.
(Analysis model / analysis software)
An analysis model is shown in FIGS. This analysis model is a model of a main part that is expected to have a large influence on the shape of the vehicle body and the shape of the carriage in consideration of the air flow. The cart cover 5 is transparent and illustrated.

For the CFD analysis, commercially available general-purpose numerical fluid analysis software FLUENT was used.
(Analysis result)
As shown in FIG. 11, the air flow lines near the end closing plate portion (front surface in the traveling direction) of the hollow recess are greatly reduced and almost eliminated. Therefore, it turns out that it becomes difficult to snow. In FIG. 11 (FIGS. 15 and 18), the upper and front closing plates are shown transparent.

  As shown in FIG. 12, the flow velocity distribution of the air in the hollow recess was close to half of the vehicle speed near the end closing plate portion (front surface in the traveling direction) by providing a dummy member. You can see that Further, as shown in FIG. 13, the pressure distribution of air in the hollow recess has a low pressure in the vicinity of the end closing plate portion (front surface in the traveling direction), and the air flow almost directly hits the end closing plate portion. I understand that it is not.

  From the above analysis results, by providing the dummy member 11, the air that attempts to enter the hollow recess S is obstructed by the dummy member 11 that functions as a barrier or an air guide and almost enters the hollow recess S. It is confirmed that it is difficult for snow to adhere. It has been confirmed by similar analysis that such a tendency has little relation to the traveling speed of the high-speed railway vehicle.

The present embodiment is not limited to the above-described embodiment, and can be configured as follows.
(i) Although the dummy members 11 and 12 are formed so as to guide air downward (toward the road surface), it is only necessary that the dummy members 11 and 12 can guide air (running wind) in a direction other than the hollow recess. Further, the cross section need not be a uniform cross section as long as it can guide air (running wind) in a direction other than the hollow recess and reduce the flow of air into the hollow recess. In addition, as long as it is within a vehicle limit, it may protrude further to the side than the vehicle width.

That is, in the embodiment, as shown in FIG. 14 (a), the dummy members 11 and 12 have a mountain-shaped cross section that extends uniformly in the vehicle width direction. (B) As shown in (c), the center portions 11Aa, 12Aa, 11Ba, 12Ba of the dummy members 11A, 12A, 11B, 12B and the left and right end portions 11Ab, 12Ab, 11Bb, 12Bb are shifted in the vehicle front-rear direction , Air may be made easier to escape in the vehicle width direction. Further, as shown in FIG. 14 (d), dummy members 11C and 12C having substantially mountain-shaped cross sections in which the air receiving surfaces 11Ca and 12Ca are curved in a concave shape can be used. Furthermore, a triangular prism-shaped dummy member 11D as shown in FIG. 14 (e) or a triangular pyramid-shaped dummy member 11E as shown in FIG. 14 (f) can be used so that the air can be easily divided into left and right.
(ii) The dummy member 11 is composed of a plurality of members divided in the vehicle width direction, but may be composed of an integral member over the entire vehicle width direction.
(Second Embodiment)
FIG. 15 is a side view of the lower portion of the high-speed railway vehicle provided with the snow accretion prevention device for the high-speed railway vehicle according to the present invention. FIG. 16 is an enlarged view of a portion C in FIG. FIG. 17 is an enlarged side view, FIG. 17B is an enlarged bottom view, and FIG. 17 is an explanatory view of a portion where a planar heater is provided.

  As shown in FIGS. 15 to 16, each vehicle body 21 of the high-speed railway vehicle according to the present invention is configured to have front and rear hollow recesses S <b> 1 and S <b> 2 in which an upper portion of a carriage 22 including wheels 22 a is located. Although not specifically illustrated, the left and right sides of the hollow recesses S1 and S2 are partitioned from the lateral external space by a cover member.

  The front hollow recess S1 is positioned between the underfloor closing plates 23 and 24 that constitute the lower floor located at the front and back, and the front and rear ends of the hollow recess S1 are inclined and extend so as to approach closer to the upper side. 25 and 26. Since the rear hollow recess S2 is configured in the same manner, only the front hollow recess S1 will be described in the following description.

  Hollow dummy members 27 and 28 projecting downward are connected to the underfloor closing plates 23 and 24, which are connecting portions of the underfloor closing plates 23 and 24 and the end closing plates 25 and 26 positioned before and after the hollow recess S1. It is provided along the width direction. In the hollow dummy members 27 and 28, there is provided a planar heater (not shown) for heating the vicinity of the connecting portion (the portion where snow is liable to occur) between the underfloor closing plates 23 and 24 and the end closing plates 25 and 26. (Refer to the range of the two-dot difference line in FIG. 16B).

  The hollow dummy member 27 guides the air obliquely downward (toward the road surface) and is detachably attached to the underfloor closing plate 23.

  As shown in FIG. 17, the hollow dummy member 27 includes a first face plate portion 27 a that is continuous with the end closing plate 25, and a second face plate portion 27 b that is inclined with respect to the underfloor closing plate 23. The second face plate portion 27b is gradually positioned on the lower side toward the central recess S1 in the vehicle front-rear direction.

  Further, the hollow dummy member 27 extends over the entire width direction (vehicle width direction) of the hollow recess S1, and, as in the first embodiment, a barrier or a hollow when air enters the hollow recess S1. It functions as an air guide that guides the traveling wind in a direction other than the recess S1.

  Further, on the inner surface side of the hollow dummy member 27, a planar heater for heating the vicinity of the connecting portion between the underfloor closing plates 23, 24 and the end closing plates 25, 26 is provided. Since no bone member is provided in the hollow dummy member 27 (on the inner surface side of each face plate portion 27a, 27b) as on the inner surface side of the end closing plate 25, a sheet heater can be provided without difficulty. It becomes.

With the above configuration, when traveling in the left direction in FIGS. 15 to 17, the air flowing from the front to the rear of the vehicle (traveling wind including snow particles) is a hollow dummy near the center of the vehicle. Guided downward along the second face plate portion 27b of the member 27. Further, in the vicinity of the left and right side portions of the vehicle , a part of the air is guided downward along the second face plate portion 27b of the hollow dummy member 27 as in the vicinity of the vehicle center , and the side of the vehicle is opened. Therefore, the remaining air is discharged to the side of the vehicle.

  As a result, the air entering the hollow recess S1 is obstructed by the hollow dummy member 27 and guided in a direction other than the hollow recess S1, and therefore hardly enters the hollow recess S1. Moreover, even if it penetrates, the velocity distribution and pressure distribution due to the air are greatly reduced as compared with the conventional one, so that the snow particles contained in the air are difficult to adhere. In addition, when progressing rightward in FIGS. 15 to 16, the hollow dummy member 28 exhibits the same function as the hollow dummy member 27 described above in the central recess S <b> 1.

  In the first place, even if snow adheres to the end closing plate 25, it is melted by the heat from the planar heater and does not snow. The vicinity of the connecting portion between the underfloor closing plate 23 and the end closing plate 25 (refer to the range W2 in FIG. 17) is also heated by the planar heater in the hollow dummy member 27, so that snow covers the entire end closing plate 25. Nothing will happen.

  Therefore, the snow adhering to the lower part of the vehicle floor (such as the end closing plate 5) is melted by the heat of the heater due to the synergistic effect of the hollow dummy member and the planar heater, so that it melts in the train running wind and warm areas. Therefore, it is possible to avoid problems such as jumping the ballast when falling to the ground, damaging the own vehicle and passing the vehicle or causing damage to the off-site line.

It is a side view of the lower part of the high-speed rail vehicle to which the snow accretion prevention device for the high-speed rail vehicle according to the present invention is attached. It is the sectional view on the AA line in FIG. It is the BB sectional view taken on the line in FIG. It is a figure which shows the whole analysis model. It is a figure which shows the floor lower part of an analysis model. It is a figure which shows the boundary conditions of an analysis model. It is a perspective view which shows the trolley | bogie part of an analysis model. It is a side view which shows the trolley | bogie part of an analysis model. It is explanatory drawing of the closing board and dummy member of an analysis model. It is explanatory drawing of the trolley | bogie of an analysis model. It is a figure which shows the analysis result about a streamline. It is a figure which shows the analysis result about speed distribution. It is a figure which shows the analysis result about pressure distribution. (A)-(f) is explanatory drawing which shows the outline of the shape of a dummy member, respectively. It is a side view of the lower part of a high-speed rail vehicle provided with a snow accretion prevention device for a high-speed rail vehicle according to the present invention. FIG. 16 is an enlarged view of a portion C in FIG. 15, where (a) is an enlarged side view and (b) is an enlarged bottom view. It is explanatory drawing of the site | part which provides a planar heater. It is a figure which shows an edge part closing plate attachment metal. It is sectional drawing in the DD line | wire of FIG. It is a figure which shows the trolley | bogie part of the analysis model of a comparative example. It is a figure which shows the analysis result about the streamline of a comparative example. It is a figure which shows the analysis result about the speed distribution of a comparative example. It is a figure which shows the analysis result about the pressure distribution of a comparative example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,21 Car body of a high-speed railway vehicle 2 Front floor lower part 2a End part closing board 2b Under floor closing board 3 Rear side lower part 3a End part closing board 3b Under floor closing board 4 Dolly 11 Dummy member 11A-11E Dummy member 12A-12E Dummy member 21 Car body 22 Carriage 23, 24 Underfloor closing plate 25, 26 End closing plate 27, 28 Hollow dummy member 27a First surface plate portion 27b Second surface plate portion S1, S2 Hollow recess

Claims (7)

A hollow recess upper part of the carriage is located between the floor closing plate under the floor portion located in front and rear, in the snow-accretion preventing device of the high-speed railway vehicle front and rear are partitioned at the end closing plate of the hollow recess ,
The underfloor closing plate that extends in the horizontal direction at the lower part of the front floor and functions as a barrier that lowers the speed or pressure of air that protrudes downward and enters the hollow recess in the vicinity of the connecting portion with the end closing plate. A snow accretion prevention device for a high-speed railway vehicle, wherein a dummy member is provided. A hollow recess floor closing of the plates stand car top floor lower you located before and after are positioned in snow accretion prevention device of the high-speed railway vehicle front and rear are partitioned at the end closing plate of the hollow recess ,
A dummy member that functions as an air guide portion that projects downward and projects air in a direction other than the hollow concave portion, in the vicinity of a connecting portion with the end portion closing plate , in the lower floor closing plate that extends in the horizontal direction at the lower portion of the front floor. An apparatus for preventing snow accretion of a high-speed railway vehicle, comprising:   The snow accretion prevention device for a high-speed railway vehicle according to claim 2, wherein the dummy member has an inclined surface portion in which a downward projecting amount gradually increases toward the rear in the vehicle traveling direction, and guides air downward.   The dummy member has a cross-sectional chevron shape having a rear inclined surface portion that continuously decreases from the rear end of the inclined surface portion and gradually decreases downward, and is provided over the entire vehicle width direction. The snow accretion prevention apparatus of the described high-speed rail vehicle. Snow accretion of a high-speed railway vehicle having a hollow recess in which the upper part of the carriage is positioned between the underfloor closing plates located at the front and back of the floor, and a heater provided on the inner surface side of the end closing plate that partitions the front and rear of the hollow recess In the prevention device,
A hollow dummy member projecting downward is provided along the vehicle width direction in the vicinity of a connecting portion of the lower floor underfloor closing plate and the end portion closing plate, and the underfloor closing plate is provided in the hollow dummy member. A snow prevention device for a high-speed railway vehicle, characterized in that a heater is provided for heating the vicinity of the connecting portion between the rim and the end closing plate.   6. The snow accretion prevention device for a high-speed railway vehicle according to claim 5, wherein a bone member is provided on an inner surface side in the vicinity of a connecting portion between the underfloor closing plate and the end closing plate. The said hollow dummy member functions as an air guide part which guides air in the direction other than the barrier which reduces the speed or pressure of the air which penetrates in the said hollow recessed part, or the said hollow recessed part. Snow accretion prevention device for high-speed railway vehicles.

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