Rail car

Abstract

To provide a rail car which is equipped with an air outlet structure that does not obstruct the flow of conditioned-air and suppresses the diffusion of noise into the passenger compartment, which is caused by conditioned-air passing through an air outlet with a small opening area.SOLUTION: In a rail car having an air conditioning unit, a conditioned-air duct connected to the air conditioning unit, and an air outlet cover connected to the conditioned-air duct, the air outlet cover has an air passage running from a conditioned-air outlet opening formed at an end opposite the car compartment to an open end on the car compartment side. The air passage has a shape in which the cross-section of the air passage narrows as it runs from the air outlet opening to the open end on the car compartment side, and a noise absorbing structure is arranged adjacent to the air passage, and air can circulate inside the noise absorbing structure through the noise absorbing opening formed on the side part that constitutes the air passage.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a rail vehicle. [Background technology]

[0002] For example, railway vehicles are equipped with ventilation systems and air conditioning systems (hereinafter referred to as air conditioners) to improve thermal comfort inside the vehicle cabin. The air conditioner mixes recirculated air taken in from various parts of the interior of the railway vehicle with fresh air taken in by the ventilation system, and in the process of passing the air through an interior heat exchanger, generates conditioned air by harmonizing the temperature and humidity of the recirculated air and the fresh air, and supplies the conditioned air to various parts of the interior of the railway vehicle.

[0003] For the above-mentioned air circulation in the railcar, an air outlet for blowing conditioned air into the car cabin and an air inlet for taking in recirculated air from the car cabin are installed in the car cabin. The air outlet and the air inlet are generally arranged by utilizing openings in the interior panels or floor boards in the car cabin or gaps between the interior panels. Therefore, the size of each air outlet and air inlet must be small so as not to reduce the strength of the interior panels or floor boards due to the openings and to prevent passengers from accidentally inserting their hands into the air outlet and air inlet. However, by reducing the size of the air outlet and air inlet in the car cabin, the ventilation area of ​​the air passing through the air outlet and air inlet in the car cabin is reduced, so that the wind speed of the air passing through the air outlet and air inlet becomes faster, which increases the noise caused by the air, and is a concern for causing discomfort to passengers.

[0004] To solve such problems, for example, in an air intake installed on the floor of the vehicle cabin, there is a structure in which a cover arranged over the opening of the air intake is configured with a support member so that it does not come into contact with the floor. With this structure, the air flowing into the air intake passes through the gap between the cover and the floor, causing the air flow to meander, slowing down the wind speed at the air intake and reducing the noise generated by the air passing through the air intake, and a technology has been developed in Patent Document 1 in which the cover over the opening prevents the noise generated at the air intake from being transmitted directly into the passenger compartment. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2023-14863 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, according to Patent Document 1, the above structure is applied to an intake port installed on the floor of the vehicle interior, and there is a problem that the effect obtained by the above structure is different for an outlet where the air flow is reversed. In addition, when a configuration like that of Patent Document 1 is applied to an outlet, there is a concern that the conditioned air will hit the cover installed on the opening, causing turbulence in the flow and generating noise. Furthermore, when the conditioned air hits the cover, the wind speed of the conditioned air blown into the passenger compartment is reduced, and the conditioned air cannot be sufficiently circulated in the passenger compartment, which may make it difficult to achieve uniform thermal comfort in the passenger compartment.

[0007] Therefore, an object of the present invention is to provide a railway vehicle equipped with an air outlet structure that does not impede the flow of conditioned air and makes it difficult for noise generated by the conditioned air passing through an air outlet with a limited opening area to propagate into the passenger compartment. [Means for solving the problem]

[0008] One representative rail vehicle of the present invention is: A rail vehicle having an air conditioner, a conditioned air duct connected to the air conditioner, and an air outlet duct connected to the conditioned air duct, the air outlet opening has an air passage extending from an air outlet opening for conditioned air formed at an end portion opposite to the passenger compartment to an end portion open on the passenger compartment side, and the air passage has a shape such that a cross section of the air passage becomes narrower from the air outlet opening toward the end portion on the passenger compartment side, This is achieved by arranging a sound absorbing structure adjacent to the air passage, and allowing air to flow inside the sound absorbing structure through sound absorbing openings formed on the side surfaces that form the air passage. Effect of the Invention

[0009] According to the present invention, it is possible to provide a railway vehicle equipped with an air outlet structure that does not impede the flow of conditioned air and makes it difficult for noise generated when conditioned air passes through an air outlet with a limited opening area to propagate into the passenger compartment. Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a side view of a railway vehicle. [Diagram 2] FIG. 2 is a cross-sectional view (cross-section AA in FIG. 1) intersecting the longitudinal direction of the railway vehicle. [Diagram 3] FIG. 3 is a detailed diagram (part B in FIG. 2) of a cross section intersecting with the longitudinal direction of the railway car, showing the configuration of the air outlet structure provided in the railway car according to the first embodiment. [Figure 4] FIG. 4 is a diagram illustrating a schematic diagram of the flow of conditioned air and the propagation state of noise generated at the air outlet in the air outlet structure provided in a railway vehicle according to the first embodiment. [Diagram 5] FIG. 5 is a cross-sectional view (cross-section CC in FIG. 3) intersecting the width direction of the railway car, showing the configuration of the air outlet structure provided in the railway car according to the first embodiment. [Figure 6] FIG. 6 is a cross-sectional view (cross-section DD in FIG. 3) intersecting in the height direction of the railway car, showing the configuration of the air outlet structure provided in the railway car according to the first embodiment. [Figure 7] FIG. 7 is a cross-sectional view (cross-section CC in FIG. 3) intersecting the width direction of the railway car, showing the configuration of an air outlet structure provided in the railway car according to the second embodiment. [Figure 8]FIG. 8 is a cross-sectional view (cross-section CC in FIG. 3) intersecting the width direction of the railway car, showing the configuration of an air outlet structure provided in the railway car according to the third embodiment. [Figure 9] FIG. 9 is a cross-sectional view (cross-section DD in FIG. 3) intersecting with the height direction of the railway car, showing the configuration of an air outlet structure provided in the railway car according to the third embodiment. [Figure 10] FIG. 10 is a detailed cross-sectional view (part B in FIG. 2) intersecting with the longitudinal direction of the railway car, showing the configuration of an air outlet structure provided in the railway car according to the fourth embodiment. [Figure 11] FIG. 11 is a cross-sectional view (section EE in FIG. 2) intersecting the width direction of the railway car, showing the configuration of an air outlet structure provided in the railway car according to the fifth embodiment. [Figure 12] FIG. 12 is a cross-sectional view (section EE in FIG. 2) intersecting the width direction of the railway car, showing the configuration of an air outlet structure provided in the railway car according to the sixth embodiment. [Figure 13] FIG. 13 is a cross-sectional view (section EE in FIG. 2) intersecting with the width direction of the railway car, showing the configuration of an air outlet structure provided in the railway car according to the seventh embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Rail vehicles are vehicles that operate along a laid track, and include railway cars, monorail cars, trams, new transit cars, etc. In the embodiments of the present invention described below, a railway car will be described as a representative example of a rail vehicle. The following embodiments can also be applied to rail vehicles other than railway cars.

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. First, the directions used to describe the implementation of the invention will be defined. The longitudinal direction of the railway vehicle or the rail direction is defined as the x-direction, the width direction of the railway vehicle or the sleeper direction is defined as the y-direction, and the up-down direction or height direction of the railway vehicle is defined as the z-direction. Hereinafter, these directions may be simply referred to as the x-direction, y-direction, and z-direction.

[0013] Fig. 1 is a side view of a railway vehicle, and Fig. 2 is a cross-sectional view (cross-section AA in Fig. 1) intersecting the longitudinal direction of the railway vehicle. The railway vehicle 1 is a roughly rectangular parallelepiped made up of an underframe 10 forming the floor surface, side structures 20 erected at both ends of the underframe 10 in the y direction, an end structure 40 erected at the ends of the underframe 10 in the x direction, and a roof structure 30 placed on the upper ends of the side structure 20 and the end structure 40. Both ends of the underframe 10 in the x direction are supported by bogies 5 whose wheels roll on tracks 3. In addition, an air conditioning unit 50 is provided below the underframe 10.

[0014] The side structure 20 is provided with a plurality of windows 35 and an entrance / exit 36 ​​through which passengers, crew members, etc. get on and off. In addition, a riser duct 23 and an air outlet duct 24 are provided on the inside of the car.

[0015] The interior of the railway vehicle 1 is composed of an interior panel 31, a luggage rack 32, a floor panel 33, etc., and the air outlet 25 is formed between the interior panel 31 and the luggage rack 32. The circulating air duct 21 and the conditioned air duct 22 are disposed between the floor panel 33 and the underframe 10, and are connected to the air conditioner 50 through an underfloor duct 28 (see FIG. 11). The conditioned air duct 22, which is disposed between the floor panel 33 and the underframe 10 and on the outer side of the vehicle than the circulating air duct 21, is connected to the rising duct 23 and the air outlet duct 24 (see FIG. 11) between the side structure 20 and the interior panel 31. As a result, the conditioned air flows from the air conditioner 50 through the underfloor duct 28 to the conditioned air duct 22, and then, as shown by the flow 60 of the conditioned air, flows through the rising duct 23 and the air outlet duct 24 into the vehicle interior from the air outlet 25.

[0016] First Embodiment Fig. 3 shows a detailed cross-sectional view (part B in Fig. 2) showing the configuration of the air outlet structure of the first embodiment, and Fig. 4 shows an image of the flow of conditioned air and the propagation of noise (sound waves 70) generated at the air outlet of the first embodiment superimposed on Fig. 3. Fig. 5 shows a cross-sectional view (cross-section CC in Fig. 3) of the air outlet structure of the first embodiment intersecting in the width direction of the railway car, and Fig. 6 shows a cross-sectional view (cross-section DD in Fig. 3) of the air outlet structure of the first embodiment intersecting in the height direction of the railway car.

[0017] The air outlet 25 is composed of an air outlet duct 24, a frame-shaped gap filler 26, a straightening plate 27, an air outlet casing 11, and a sound absorbing structure 12, and is installed in the gap between an interior panel 31 and a luggage shelf 32. From an opening 24a of the air outlet duct 24 to an air outlet opening 11a of the air outlet casing 11, a through opening (flow path) is formed so that conditioned air flows from the air outlet 25 into the vehicle interior. The straightening plate 27 is a punched plate (a plate with many holes) and is fixed to the air outlet casing 11 so as to make the wind speed of the entire air outlet uniform. The gap filler 26 fills the gap between the straightening plate 27 and the air outlet duct 24 to prevent air from escaping from the gap.

[0018] The air outlet casing 11 has a cross-sectional shape that is approximately U-shaped with the end on the vehicle interior side open, and an air outlet opening 11a is provided on the side surface on the vehicle exterior that corresponds to the end opposite to the vehicle interior. The height of the air outlet casing 11 is lower than the air passage height Ho at the air outlet opening 11a at the end on the vehicle interior side, and the air passage cross section (cross section perpendicular to the flow direction of the harmonious air) is gradually narrowed toward the end on the vehicle interior side of the air outlet casing 11. A sound absorbing structure 12 is provided on the side surface of the upper wall of the air outlet casing 11. The sound absorbing structure 12 is composed of a perforated plate 12a with holes, a housing 12c whose opening on one side is shielded by the perforated plate 12a, and a sound absorbing material 12d (FIG. 5) provided in the internal space of the housing 12c, and the perforated plate 12a is exposed to the air passage inner surface of the air outlet casing 11 through a sound absorbing opening 11b provided in the air outlet casing 11. In other words, the inside of the sound absorbing structure 12 communicates with the internal space of the air passage via the sound absorbing opening 11b so that air can flow therethrough.

[0019] According to the above-mentioned configuration, the conditioned air flows from the opening 24a of the air outlet duct 24 through the straightening plate 27 and the air outlet opening 11a of the air outlet casing 11 into the vehicle compartment along the air passage formed by the side of the air outlet casing 11. On the other hand, since the opening 24a of the air outlet duct 24 and the straightening plate 27 have a small opening area, the wind speed of the conditioned air increases when passing through the opening 24a and the straightening plate 27, and noise due to the air may be generated. The generated noise (sound wave 70) is reflected by the air passage side 11c of the air outlet casing 11 as shown in FIG. 4, because the air passage of the air outlet casing 11 narrows toward the vehicle compartment, and propagates to the casing side on the opposite side where the sound absorbing structure 12 is located, passes through the sound absorbing opening 11b, and is absorbed by the sound absorbing structure 12. This makes it possible to provide an air outlet structure that does not impede the flow of conditioned air, and that absorbs noise generated when conditioned air passes through an air outlet with a limited opening area with the sound absorbing structure 12, making it difficult for the noise to propagate inside the passenger compartment.

[0020] In order to prevent disturbance of the flow of harmonious air in the part exposed through the sound absorbing opening 11b of the air outlet casing 11, the side surface of the air outlet casing 11 and the air passage exposed surface of the sound absorbing structure 12 (here, the lower surface of the perforated plate 12a) are preferably smooth (or flush) as shown in Figs. 3 and 5. In addition, in order to absorb noise generated at the air outlet, the sound absorbing structure 12 is preferably installed in the vehicle longitudinal direction (x direction) within the range where the air outlet 25 is located (so as to overlap with the air outlet 25). Even if the sound absorbing structure 12 does not have either or both of the perforated plate 12a and the housing 12c, the inside of the sound absorbing structure 12 is connected to the internal space of the air passage so that air can flow, and therefore the same effect can be obtained. In addition, the perforated plate opening (hole) 12b of the perforated plate 12a of the sound absorbing structure 12 may be a slit hole instead of a circular hole as shown in Fig. 6.

[0021] The present invention described above is not limited to the first embodiment, and can be embodied in various forms. Other embodiments will be described below with reference to the drawings.

[0022] <Second embodiment> 7 is a cross-sectional view (cross-section CC in FIG. 3) of the air outlet structure of the second embodiment, which crosses the width direction of the railway vehicle. A duplicated description of the configuration and function similar to those of the first embodiment described above will be omitted, and a unique configuration of the second embodiment will be described.

[0023] The sound absorbing structure 12 is composed of a perforated plate 12a having holes, a housing 12c, and an air layer 12e, and is a structure in which, as viewed from the air passage of the air outlet casing 11, there is a space containing air in the internal space of the housing 12c behind the perforated plate 12a. The air layer 12e is connected to the air passage through the perforated plate opening 12b, and as a result, like a Helmholtz resonator, the sound pressure of the sound incident from the sound absorbing opening 11b of the air outlet casing 11 and the change in the sound pressure inside the air layer 12e cause the air to vibrate through the perforated plate 12a, causing resonance at a specific frequency, thereby achieving sound absorption. By utilizing this phenomenon and adjusting the thickness of the perforated plate 12a, the hole diameter of the perforated plate opening 12b, and the Z-direction height of the housing 12c to match the characteristic frequency of the noise generated at the air outlet, it is possible to effectively absorb unpleasant noise generated at the air outlet. The air layer 12e may be formed in a plurality of separate chambers each facing the perforated plate 12a, or may be formed in a single chamber.

[0024] The railcar 1 having the configuration described in the second embodiment can achieve the same effects and advantages as those described in the above-mentioned embodiment. Also, the same effects can be achieved when the sound absorbing material 12d is provided in a part or the whole of the air layer 12e.

[0025] <Third embodiment> Fig. 8 is a cross-sectional view (cross-section CC in Fig. 3) of the air outlet structure of the third embodiment, which crosses the width direction of the railway vehicle. Fig. 9 shows a cross-sectional view (cross-section DD in Fig. 3) of the air outlet structure of the third embodiment, which crosses the height direction of the railway vehicle. Explanations of configurations and functions similar to those of the first and second embodiments will be omitted, and only the configuration unique to the third embodiment will be explained.

[0026] In the configurations described in the first and second embodiments, instead of providing a perforated plate 12a of the sound absorbing structure 12, a porous structure in which the sound absorbing openings 11b are a plurality of small holes is provided on the upper wall of the air outlet casing 11 adjacent to the sound absorbing structure 12. In this case, it can be said that the side wall of the air outlet casing 11, which is a porous structure, constitutes a part (perforated plate 12a) of the sound absorbing structure 12. As a result, noise generated at the air outlet passes through the sound absorbing openings 11b, which are a porous structure provided on the side of the air outlet casing 11, and propagates to the sound absorbing material 12d of the sound absorbing structure 12, thereby absorbing the sound. In addition, according to this embodiment, it is not necessary to align the side of the air outlet casing 11 with the air passage exposed surface of the sound absorbing structure 12, and the number of steps in manufacturing the vehicle can be reduced.

[0027] The railway vehicle 1 having the configuration explained in the third embodiment can achieve the same actions and effects as those explained in the above embodiments.

[0028] <Fourth embodiment> Fig. 10 is a cross-sectional view (part B in Fig. 2) showing the configuration of the air outlet structure of the fourth embodiment. The duplicated explanations of the configurations and functions similar to those of the first to third embodiments described above will be omitted, and only the configuration unique to the fourth embodiment will be described.

[0029] In contrast to any of the configurations described in the first to third embodiments, the side surface forming the air passage of the air passage side surface 11c of the air outlet casing 11 has an uneven shape. Noise generated from the air outlet is reflected by the air passage side surface 11c of the air outlet casing 11 and propagates to the sound absorbing structure 12 where it is absorbed, but this uneven shape increases the reflective area on the air passage side surface 11c of the air outlet casing 11 and makes it easier to reflect sound into the air passage of the air outlet casing 11, making it easier for the noise generated at the air outlet to propagate to the sound absorbing structure 12 and improving the sound absorbing effect.

[0030] The uneven shape of the air passage side surface 11c of the air outlet case 11 may be formed not only by deforming the shape of the air outlet case 11 itself, but also by attaching an additional part, such as a tape, to the air outlet case 11.

[0031] 10, the uneven shape of the air passage side surface 11c of the air outlet casing 11 may be arranged not only in the vehicle width direction but also in the vehicle longitudinal direction. Since sound waves generated at the air outlet propagate in the vehicle longitudinal direction, the uneven shape of the air passage side surface 11c of the air outlet casing 11 in the vehicle longitudinal direction makes it easier for the sound waves to be reflected by the air passage side surface 11c of the air outlet casing 11, and the noise generated at the air outlet propagates to the sound absorbing structure 12, improving the sound absorbing effect. For example, the uneven shape of the air passage side surface 11c may be formed of protrusions or recesses arranged in multiple rows and columns.

[0032] The railway vehicle 1 having the configuration explained in the fourth embodiment can achieve the same actions and effects as those explained in the above embodiments.

[0033] <Fifth embodiment> Fig. 11 is a cross-sectional view (EE part in Fig. 2) showing the configuration of the air outlet structure of the fifth embodiment. The duplicated description of the configurations and functions similar to those of the first to fourth embodiments described above will be omitted, and only the configuration unique to the fifth embodiment will be described.

[0034] In any of the configurations described in the first to fourth embodiments, in the longitudinal direction of the cabin of the railway vehicle 1, a sound absorbing structure 12 is installed for each air outlet 25 within an area where there is one or more air outlets 25. This allows the sound absorbing structures 12 to individually absorb noise generated at the air outlets 25, making it difficult for the noise generated at the air outlets 25 to propagate throughout the entire cabin.

[0035] The railway vehicle 1 having the configuration explained in the fifth embodiment can achieve the same actions and effects as those explained in the above embodiments.

[0036] Sixth embodiment Fig. 12 is a cross-sectional view (EE part in Fig. 2) showing the configuration of the air outlet structure of the sixth embodiment. The duplicated description of the configurations and functions similar to those of the first to fourth embodiments will be omitted, and only the configuration unique to the sixth embodiment will be described.

[0037] In any of the configurations described in the first to fourth embodiments, the sound absorbing structure 12 is provided across a plurality of air outlets 25 (preferably all of the air outlets in the vehicle) in the range where the air outlet casing 11 is provided in the vehicle longitudinal direction. This allows the sound absorbing structure 12 to absorb noise at the air outlets 25 throughout the vehicle. In addition, since the sound absorbing structure 12 is also provided between adjacent air outlets 25, it is possible to absorb sound propagated in the vehicle longitudinal direction, and it is possible to make it difficult for noise generated at the air outlets to propagate throughout the entire vehicle interior.

[0038] The railway vehicle 1 having the configuration explained in the sixth embodiment can achieve the same actions and effects as those explained in the above embodiments.

[0039] Seventh embodiment Fig. 13 is a cross-sectional view (EE part in Fig. 2) showing the configuration of the air outlet structure of the seventh embodiment. The duplicated description of the configurations and functions similar to those of the first to fourth embodiments will be omitted, and only the configuration unique to the seventh embodiment will be described.

[0040] In any of the configurations described in the first to fourth embodiments, the sound absorbing structure 12 is installed only at the air outlets 25 in the vehicle cabin where the wind speed of the conditioned air is fast, among all the air outlets 25 in the vehicle cabin. When the wind speed of the conditioned air is fast, the noise generated at the air outlets 25 becomes louder, so by installing the sound absorbing structure 12 only at the air outlets 25 where the wind speed of the conditioned air is faster than a predetermined value, for example, it is possible to effectively absorb noise that tends to propagate throughout the vehicle cabin and make it difficult for the noise to propagate throughout the vehicle cabin. Furthermore, since the sound absorbing structure 12 is installed only at the necessary air outlets 25, the increase in weight of the railway vehicle 1 and the number of manufacturing steps can be suppressed.

[0041] Generally, in the air outlets 25 installed directly above the air conditioner 50 and the underfloor duct 28, and in the air outlets 25 installed at the end of the vehicle, the pressure loss occurring in the conditioned air duct from the air conditioner 50 to each air outlet 25 is small, so the wind speed of the conditioned air becomes faster than a predetermined value. Alternatively, the air outlets 25 through which the wind speed of the conditioned air is faster than a predetermined value may be specified by simulation, experiment, etc. It is desirable to install sound absorbing material 12d in such air outlets.

[0042] The railway vehicle 1 having the configuration explained in the seventh embodiment can achieve the same actions and effects as those explained in the above embodiments.

[0043] In the above, in the first to seventh embodiments, the air outlet structure installed in the gap between the luggage shelf and the interior panel has been described, but the present invention is not limited to the air outlet installed in the gap between the luggage shelf and the interior panel, and can be applied to any air outlet in the vehicle cabin as long as it has the same configuration. Although the air passage through which the conditioned air flows is formed in the air outlet casing, a part of the air outlet casing may be formed by the interior panel or the luggage shelf. In addition, all of the embodiments are applicable not only to railway cars but also to transportation equipment in general that has an air conditioning and ventilation system.

[0044] This specification includes the disclosure of the following inventions. (First aspect) A rail vehicle having an air conditioner, a conditioned air duct connected to the air conditioner, and an air outlet duct connected to the conditioned air duct, the air outlet opening has an air passage extending from an air outlet opening for conditioned air formed at an end portion opposite to the passenger compartment to an end portion open on the passenger compartment side, and the air passage has a shape such that a cross section of the air passage becomes narrower from the air outlet opening toward the end portion on the passenger compartment side, A sound absorbing structure is disposed adjacent to the air passage, and air can flow through the inside of the sound absorbing structure via a sound absorbing opening formed on a side surface that constitutes the air passage. A rail vehicle characterized by:

[0045] (Second aspect) In the first aspect of the rail vehicle, The sound absorbing structure is composed of a housing and a perforated plate having a plurality of holes, and a sound absorbing material is disposed in a space inside the housing behind the perforated plate when viewed from the air passage side. A rail vehicle characterized by:

[0046] (Third aspect) In the first aspect of the rail vehicle, The sound absorbing structure is composed of a housing and a perforated plate having a plurality of holes, and an air layer is present in the space inside the housing behind the perforated plate when viewed from the air passage side. A rail vehicle characterized by:

[0047] (Fourth aspect) In the rail vehicle of the second or third aspect, The perforated plate is exposed to the inner surface of the air passage of the air outlet opening through the sound absorbing opening. A rail vehicle characterized by:

[0048] (Fifth aspect) In the rail vehicle of the second or third aspect, The perforated plate constitutes a side wall of the air passage, and the holes in the perforated plate constitute the sound absorbing opening. A rail vehicle characterized by:

[0049] (Sixth aspect) In any one of the first to fifth aspects of the rail vehicle, In the air passage of the air outlet opening, a side surface opposite to the side surface on which the sound absorbing opening is provided is formed into an uneven shape. A rail vehicle characterized by:

[0050] (Seventh aspect) In any one of the first to sixth aspects of the rail vehicle, The sound absorbing structure is installed in a range in the vehicle longitudinal direction in which one or more of the air outlet openings are present, corresponding to the air outlet openings. A rail vehicle characterized by:

[0051] (Eighth aspect) In any one of the first to sixth aspects of the rail vehicle, The sound absorbing structure is provided across a plurality of the air outlet openings in a range in the vehicle longitudinal direction in which the air outlet opening is provided. A rail vehicle characterized by:

[0052] (Ninth aspect) In any one of the first to sixth aspects of the rail vehicle, The sound absorbing structure is installed only in correspondence with the air outlet opening through which the harmonious air flows at a speed faster than a predetermined value. A rail vehicle characterized by: [Explanation of symbols]

[0053] 1...Railway vehicle, 3...Track, 5...Carriage, 10...Frame, 11...Blowout opening, 11a...Blowout opening, 11b...Sound absorption opening, 11c...Air passage side, 11d...cabin side end, 12...sound absorption structure, 12a...perforated plate, 12b...perforated plate opening, 12c...housing, 12d...sound absorbing material, 12e...air layer; 20...side structure; 21...circulating air duct, 22...harmonized air duct, 23... rising duct, 24... air outlet duct, 24a... duct opening, 25... outlet, 26...gap filling, 27...rectifier plate, 28...underfloor duct, 30...roof structure, 31...interior board, 32...luggage shelf, 33...floor, 34...seat, 35…window area, 36…boarding / alighting door, 40... gable structure, 50... air conditioning unit, 60...Flow of harmonious air, 70...Sound waves from the outlet, 80...center line, x...Longitudinal direction of the railway vehicle (rail direction), y...Width direction of the railway vehicle (sleeper direction), z: Height direction of the railway vehicle

Claims

1. A rail vehicle having an air conditioner, a conditioned air duct connected to the air conditioner, and an air outlet duct connected to the conditioned air duct, the air outlet opening has an air passage extending from an air outlet opening for conditioned air formed at an end portion opposite to the passenger compartment to an end portion open on the passenger compartment side, and the air passage has a shape such that a cross section of the air passage becomes narrower from the air outlet opening toward the end portion on the passenger compartment side, A sound absorbing structure is disposed adjacent to the air passage, and air can flow through the inside of the sound absorbing structure via a sound absorbing opening formed on a side surface that constitutes the air passage. A rail vehicle characterized by:

2. The railway vehicle according to claim 1, The sound absorbing structure is composed of a housing and a perforated plate having a plurality of holes, and a sound absorbing material is disposed in a space inside the housing behind the perforated plate when viewed from the air passage side. A rail vehicle characterized by:

3. The railway vehicle according to claim 1, The sound absorbing structure is composed of a housing and a perforated plate having a plurality of holes, and an air layer exists in the space inside the housing behind the perforated plate when viewed from the air passage side. A rail vehicle characterized by:

4. In the railway vehicle according to claim 2 or 3, The perforated plate is exposed to the inner surface of the air passage of the air outlet opening through the sound absorbing opening. A rail vehicle characterized by:

5. In the railway vehicle according to claim 2 or 3, The perforated plate constitutes a side wall of the air passage, and the holes in the perforated plate constitute the sound absorbing opening. A rail vehicle characterized by:

6. The railway vehicle according to claim 1, In the air passage of the air outlet opening, a side surface opposite to the side surface on which the sound absorbing opening is provided is formed into an uneven shape. A rail vehicle characterized by:

7. The railway vehicle according to claim 1, The sound absorbing structure is installed in a range in the vehicle longitudinal direction in which one or more of the air outlet openings are present, corresponding to the air outlet openings. A rail vehicle characterized by:

8. The railway vehicle according to claim 1, The sound absorbing structure is provided across a plurality of the air outlet openings in a range in the vehicle longitudinal direction in which the air outlet opening is provided. A rail vehicle characterized by:

9. The railway vehicle according to claim 1, The sound absorbing structure is installed only in correspondence with the air outlet opening through which the harmonious air flows at a speed faster than a predetermined value. A rail vehicle characterized by:

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