Power converter for railway vehicles

Abstract

To provide a power conversion device for a railroad vehicle capable of suppressing the generation of clogging in a filter due to dust particles entering from a housing ventilation hole.SOLUTION: In a power conversion device 100 for a railroad vehicle, a filter 41 arranged in a ventilation passage 30 ventilating between an inside part 20a of a housing 20 and an outside part of the housing 20, is arranged at a position deviating from a housing ventilation hole 21 when seen from the side (the X1 side) of the housing ventilation hole 21 as an inlet of the ventilation passage 30.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a power conversion device for a railway vehicle, and more particularly to a power conversion device for a railway vehicle including a housing provided with a housing ventilation port on an outer surface of the housing.

Background Art

[0002] Conventionally, a power conversion device for a railway vehicle including a housing provided with a housing ventilation port on an outer surface of the housing has been known (see, for example, Patent Document 1).

[0003] Patent Document 1 describes a power conversion device for a railway vehicle in which an inspection cover member is attached to an outer surface of a housing. In the power conversion device for a railway vehicle described in Patent Document 1, an opening (housing ventilation port) for ventilating between the inside and the outside of the housing is formed in the cover member. A filter is attached to the cover member so as to cover the opening from the inside of the housing. That is, in the power conversion device for a railway vehicle described in Patent Document 1, the ventilation path from the opening to the filter is linear and the distance from the opening to the filter is relatively short.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the power converter for railway vehicles described in Patent Document 1, the ventilation path from the opening (housing vent) to the filter is linear, and the distance from the opening to the filter is relatively short, making it easy for dust entering through the opening to reach the filter. In other words, the filter is prone to clogging by dust. For this reason, there is a need for a power converter for railway vehicles that can suppress clogging of the filter by dust entering through the opening (housing vent).

[0006] This invention was made to solve the above-mentioned problems, and one of its objectives is to provide a power converter for railway vehicles that can suppress clogging of the filter due to dust entering through the housing vents. [Means for solving the problem]

[0007] To achieve the above objective, the power converter for railway vehicles according to the first aspect of this invention is a power converter for railway vehicles mounted on a railway vehicle, comprising: a power conversion unit; a housing housing the power conversion unit; and a filter arranged in a ventilation channel that allows air to pass between the inside and outside of the housing. A filter enclosure member that surrounds the filter and, together with the filter, constitutes the filter unit, Side of the enclosure Set Filter unit they will be detained. concave filter unit The housing comprises a housing section and a housing vent, which is provided on the outer surface of the housing so as to be exposed to the outside of the housing and includes a housing vent as an inlet for a ventilation passage. ,centre The filter is positioned offset from the enclosure vent when viewed from the enclosure vent side. Ori , The housing is positioned to correspond to the filter housing and includes an opening for the filter unit for removing the filter unit from the filter unit housing, and further comprises a filter cover that is detachably attached to the housing so as to cover the opening for the filter unit. .

[0008] This invention 1In the power converter for railway vehicles, as described above, the filter placed in the ventilation channel that allows air to pass between the inside and outside of the housing is positioned offset from the housing vent when viewed from the housing vent side, which serves as the entrance to the ventilation channel. As a result, the path from the housing vent to the filter in the ventilation channel is not at least straight, and the distance from the housing vent to the filter in the ventilation channel tends to be longer compared to the case where the filter is installed so as to cover the housing vent (where the filter is positioned not offset from the housing vent when viewed from the housing vent side). This makes it difficult for dust that enters from the housing vent to reach the filter. As a result, clogging of the filter by dust that enters from the housing vent can be suppressed.

[0009] the above 1 In a power converter for railway vehicles with a specific orientation, preferably, the housing vent is provided on the side of the housing, and the filter is positioned higher than the housing vent. With this configuration, the path from the housing vent to the filter in the ventilation channel includes a portion that goes from the bottom to the top, so that in addition to dust entering through the housing vent, water entering through the housing vent can be prevented from reaching the filter above. Therefore, the above configuration in which the housing vent is provided on the side of the housing and the filter is positioned higher than the housing vent is 1 This method is particularly effective when the power conversion device for railway vehicles is installed in a location on the railway vehicle that is easily exposed to wind and rain.

[0010] In this case, preferably, the system further includes a protruding member that is provided between the filter and the housing vent, and which extends beyond the filter's vent inlet to the inside of the housing so as to bypass the air flowing in through the housing vent. With this configuration, the path from the housing vent to the filter in the ventilation channel includes a large bend due to the protrusion of the internal protruding member, and the distance from the housing vent to the filter in the ventilation channel is increased. As a result, compared to the case without the internal protruding member, dust and water entering through the housing vent are less likely to reach the filter.

[0011] In a configuration that includes a protruding member with the above-mentioned internal protruding portion, preferably, the internal protruding portion is inclined downward as it approaches the inside of the housing. With this configuration, the internal protruding portion is inclined downward as it approaches the inside of the housing, causing it to detour significantly. Compared to the case where the internal protruding portion is not inclined downward as it approaches the inside of the housing, dust and water entering through the housing vent are less likely to reach the filter. In addition, water entering through the housing vent and heading towards the inside of the housing is more likely to hit the internal protruding portion that is inclined downward and fall downward, so it is possible to effectively suppress water entering through the housing vent from reaching the filter above.

[0012] In a configuration comprising a protruding member including the internal protruding portion described above, preferably the protruding member further includes a guide opening that guides the air bypassed by the internal protruding portion to the air inlet side of the filter above. With this configuration, the air that has flowed in through the housing vent and then bypassed by the internal protruding portion can be easily guided through the guide opening to the air inlet side of the filter (and thus to the filter).

[0013] In a configuration where the above-mentioned filter is positioned higher than the housing vent, preferably ,centreThe filter unit housing is positioned higher than the housing vent. With this configuration, the filter unit housed in the filter unit housing is positioned higher than the housing vent, so even when the filter constitutes a filter unit (the filter is unitized), the filter can be reliably positioned higher than the housing vent. Furthermore, since the filter is unitized while surrounded by a filter enclosure member, the filter unit can be easily positioned in the ventilation path compared to when the filter is not unitized (exposed).

[0014] In this case, preferably, the filter unit includes a unit ventilation inlet provided on the outside of the housing, and the unit ventilation inlet is positioned higher than the lower end of the filter unit. With this configuration, dust and water entering from the housing vent are less likely to reach the unit ventilation inlet compared to when the unit ventilation inlet is located at the lower end of the filter unit. As a result, it is possible to further suppress dust and water entering from the housing vent from reaching the filter.

[0015] In a configuration where the unit ventilation inlet is positioned higher than the lower end of the filter unit, preferably, the filter unit further includes a unit ventilation outlet provided on the inside of the housing at approximately the same height as the unit ventilation inlet, the filter unit housing includes an internal housing ventilation opening leading to the inside of the housing, and the unit ventilation outlet is provided adjacent to the internal housing ventilation opening at approximately the same height as the internal housing ventilation opening. With this configuration, the path between the filter and the internal housing ventilation opening in the ventilation flow path becomes linear, and the distance from the filter to the internal housing ventilation opening in the ventilation flow path becomes relatively short. As a result, it is possible to suppress the complexity and excessive length of the portion of the ventilation flow path that does not contribute to preventing dust and water entering from the housing ventilation opening from reaching the filter (the portion between the filter and the internal housing ventilation opening in the ventilation flow path).

[0017] In the power converter for railway vehicles according to the first phase described above, Preferably, the filter cover is further provided with a sealing member between its outer periphery and the outer periphery of the filter unit housing, with the outer periphery of the filter cover protruding toward the outside of the housing. With this configuration, the sealing member provided between the outer periphery of the filter cover and the outer periphery of the filter unit housing can prevent water from entering the filter unit housing from the gap between the outer periphery of the filter cover and the outer periphery of the filter unit housing. In addition, the protrusion of the outer periphery of the filter cover improves the rigidity of the outer periphery of the filter cover, so that bending of the outer periphery of the filter cover is prevented when the sealing member is sandwiched between the outer periphery of the filter cover and the outer periphery of the filter unit housing. As a result, the formation of a gap between the outer periphery of the filter cover and the outer periphery of the filter unit housing can be prevented, so that water can be effectively prevented from entering the filter unit housing from the gap between the outer periphery of the filter cover and the outer periphery of the filter unit housing.

[0018] In the power conversion device for railway vehicles according to the first aspect described above, preferably, the ventilation passage is configured to allow air to circulate between the inside and outside of the housing in order to suppress the pressure difference between the inside and outside of the housing. With this configuration, the ventilation passage can suppress the pressure difference between the inside and outside of the housing when the railway vehicle enters and exits a tunnel, thereby suppressing the load caused by the pressure difference on the housing and the power conversion unit housed within it. Furthermore, in order to achieve the above objective, a power converter for railway vehicles according to the second aspect of this invention is a power converter for railway vehicles mounted on a railway vehicle, comprising: a power conversion unit; a housing housing the power conversion unit; and a filter arranged in a ventilation channel that allows air to pass between the inside and outside of the housing, wherein the housing is provided on the outer surface of the housing so as to be exposed to the outside of the housing and includes a housing vent as an inlet for the ventilation channel, the filter is positioned offset from the housing vent when viewed from the housing vent side, and the ventilation channel, in the portion between the housing vent and the filter, moves from the bottom to the top crankIt includes a plurality of portions that bend at substantially right angles so as to become in a state.

Advantages of the Invention

[0019] According to the present invention, as described above, it is possible to provide a power conversion device for a railway vehicle that can suppress clogging of the filter due to dust.

Brief Description of the Drawings

[0020] [Figure 1] It is a diagram showing a railway vehicle equipped with a power conversion device for a railway vehicle according to an embodiment of the present invention. [Figure 2] It is a perspective view showing the periphery of the housing ventilation port of a power conversion device for a railway vehicle according to an embodiment of the present invention. [Figure 3] It is a cross-sectional view along the line 900-900 of FIG. 2. [Figure 4] It is a perspective view showing a state in which a filter unit is removed from a unit housing portion in a power conversion device for a railway vehicle according to an embodiment of the present invention. [Figure 5] It is a perspective view showing a state in which a unit housing portion and a drain member are disassembled from a housing in a power conversion device for a railway vehicle according to an embodiment of the present invention. [Figure 6] It is a perspective view showing a state in which a cover member, a seal member, and a unit housing portion are disassembled from a housing in a power conversion device for a railway vehicle according to an embodiment of the present invention. [Figure 7] It is a perspective view showing a state in which a cover member and a seal member are removed from a housing in a power conversion device for a railway vehicle according to an embodiment of the present invention.

Modes for Carrying Out the Invention

[0021] Hereinafter, embodiments embodying the present invention will be described based on the drawings.

[0022] Referring to Figures 1 to 7, the configuration of a power converter 100 for railway vehicles according to one embodiment of the present invention will be described. The power converter 100 for railway vehicles is a power converter mounted on a railway vehicle 110.

[0023] As shown in Figure 1, the railway vehicle 110 is configured to run on rails 122 using power (DC power) supplied from the overhead line 121. The railway vehicle 110 comprises a car body 111, a pantograph 112, drive wheels 113 that propel the car body 111, an induction motor 114 that rotates the drive wheels 113, and a railway vehicle power converter 100.

[0024] The pantograph 112 receives (collects) power supplied to the overhead line 121. The railway vehicle power converter 100 includes a power conversion unit 10 that converts the DC voltage input from the overhead line 121 into an AC voltage. When the railway vehicle 110 is running, the railway vehicle power converter 100 converts the power from the overhead line 121 using the power conversion unit 10 to control the rotation of the induction motor 114.

[0025] The railway vehicle power converter 100 is mounted on the lower side (Z2 side) of the bottom 111a of the vehicle body 111. In other words, the railway vehicle power converter 100 is installed in a position on the railway vehicle 110 that is easily exposed to wind and rain.

[0026] The railway vehicle power converter 100 includes a housing 20 that houses the power conversion unit 10. As shown in Figure 2, the housing 20 includes a housing vent 21 which serves as an inlet for a ventilation passage 30 (see Figure 3). As shown in Figure 3, the ventilation passage 30 is configured to allow air to circulate between the inside 20a of the housing 20 and the outside of the housing 20 in order to suppress the pressure difference between the inside 20a of the housing 20 and the outside of the housing 20.

[0027] As shown in Figure 2, in this embodiment, the housing vent 21 is provided on the outer surface 22 of the housing 20 so as to be exposed to the outside of the housing 20. Specifically, the housing vent 21 is provided on the side surface 22a of the housing 20. Note that only one housing vent 21 is provided on the housing 20.

[0028] In the following explanation, the vertical direction will be defined as the Z direction. The upper (upper side) and lower (lower side) will be defined as the Z1 side and the Z2 side, respectively. The direction perpendicular to the side 22a of the housing 20 on which the housing ventilation opening 21 is provided will be defined as the X direction. In the X direction, the outer side of the housing 20 (the housing ventilation opening 21 side) and the inner side 20a of the housing 20 will be defined as the X1 side and the X2 side, respectively.

[0029] As shown in Figure 3, the railway vehicle power converter 100 includes a filter 41 located in the ventilation passage 30. The filter 41 is provided to prevent dust from entering the interior 20a of the housing 20 from the outside of the housing 20 via the ventilation passage 30. In this embodiment, the filter 41 is positioned offset from the housing ventilation opening 21 when viewed from the housing ventilation opening 21 side (X1 side). Specifically, the filter 41 is positioned higher than the housing ventilation opening 21. Furthermore, the filter 41 is positioned so as not to overlap with the housing ventilation opening 21 when viewed from the housing ventilation opening 21 side (X1 side).

[0030] In this embodiment, the railway vehicle power converter 100 includes a filter enclosure member 42 surrounding the filter 41. The filter enclosure member 42, together with the filter 41, constitutes a filter unit 40. Specifically, the filter 41 and the filter enclosure member 42 are integrated (unitized) by the filter enclosure member 42 such that a portion of the filter 41 (the air inlet 41a and air outlet 41b of the filter 41) is exposed to the outside of the filter enclosure member 42. The filter enclosure member 42 is made of sheet metal.

[0031] The filter unit 40 includes a unit ventilation inlet 43 provided on the outside side (X1 side) of the housing 20 and a unit ventilation outlet 44 provided on the inside side 20a (X2 side) of the housing 20. The unit ventilation outlet 44 is provided at approximately the same height as the unit ventilation inlet 43. The unit ventilation inlet 43 and the unit ventilation outlet 44 are openings formed in the filter enclosure member 42 such that a part of the filter 41 (the ventilation inlet 41a and ventilation outlet 41b of the filter 41) is exposed to the outside of the filter enclosure member 42 while the filter 41 is surrounded by the filter enclosure member 42. Note that there are multiple unit ventilation inlets 43 and unit ventilation outlets 44.

[0032] In this embodiment, the unit ventilation inlet 43 and the unit ventilation outlet 44 are positioned higher than the lower end portion 40a of the filter unit 40. Specifically, the unit ventilation inlet 43 and the unit ventilation outlet 44 are located in the central portion 40b of the filter unit 40 in the Z direction. The unit ventilation inlet 43 and the unit ventilation outlet 44 are not located at the lower end portion 40a or the upper end portion 40c of the filter unit 40 in the Z direction.

[0033] As shown in Figure 4, in this embodiment, the railway vehicle power converter 100 includes a recessed filter unit housing 50 provided on the side surface 22a of the housing 20, which houses the filter unit 40. The filter unit housing 50 is positioned higher than the housing ventilation opening 21. In this embodiment, the housing 20 is also provided at a position corresponding to the filter unit housing 50 and includes a filter unit opening 23 for removing the filter unit 40 from the filter unit housing 50.

[0034] Specifically, on the side surface 22a of the housing 20, an opening 23 for the filter unit is formed on the Z1 side of the housing ventilation opening 21. As shown in Figure 5, a recessed filter unit mounting member 51 that is recessed into the interior 20a side (X2 side) of the housing 20 is fixed to the side surface 22a of the housing 20 from the interior 20a side (X2 side) of the housing 20 by rivets 61. The filter unit mounting member 51 is attached to the housing 20 such that the Z1 side portion and the Z2 side portion of the filter unit mounting member 51 are located in the portions where the filter unit opening 23 and housing ventilation opening 21 are formed, respectively.

[0035] Furthermore, a drain member 70 (described later) is fixed to the side surface 22a of the housing 20 by rivets 62 from the inside 20a side (X2 side) of the housing 20 so as to fit inside the concave filter unit mounting member 51. The drain member 70 is attached to the housing 20 so as to be located between the filter unit opening 23 and the housing vent 21 in the Z direction. As a result, as shown in Figure 4, a concave filter unit housing portion 50 is formed on the Z1 side of the drain member 70 inside the concave filter unit mounting member 51. Note that the drain member 70 is an example of a "protruding member" in the claims.

[0036] As shown in Figure 3, the filter unit 40 is housed in a filter unit housing 50 formed by attaching the filter unit mounting member 51 and the drainage member 70 to the housing 20. The filter unit 40 is detachably attached to the filter unit mounting member 51 by filter unit fixing screws 91. On the X1 side of the filter unit 40, a space S1 is formed on the side of the air inlet 41a of the filter 41.

[0037] Furthermore, within the filter unit mounting member 51, a first sealing portion 52a is provided in the gap between the filter unit housing portion 50 and the drainage member 70, which is sealed. In addition, a second sealing portion 52b is provided in the gap between the lower end portion 51b of the filter unit mounting member 51 and the side surface 22a of the housing 20, which is sealed.

[0038] In this embodiment, the filter unit housing 50 includes an internal housing vent 51a that leads to the interior 20a of the housing 20. Specifically, the internal housing vent 51a is positioned on the filter unit mounting member 51 so as to face the unit vent outlet 44 of the filter unit 40. That is, the unit vent outlet 44 of the filter unit 40 is provided adjacent to the internal housing vent 51a at approximately the same height as the internal housing vent 51a. As a result, in the ventilation flow path 30, the space S1 on the vent inlet 41a side of the filter 41, the unit vent inlet 43 of the filter unit 40, the unit vent outlet 44 of the filter unit 40, and the internal housing vent 51a of the filter unit housing 50 are arranged in this order along the X direction, from the X1 side toward the X2 side.

[0039] In this embodiment, the railway vehicle power converter 100 includes a drain member 70 including a drain projection 71. The drain projection 71 is provided in the ventilation channel 30 between the filter 41 and the housing ventilation port 21. The drain projection 71 extends beyond the ventilation inlet 41a of the filter 41 to the interior 20a side (X2 side) of the housing 20 so as to divert the air flowing in through the housing ventilation port 21. Specifically, in the X direction, the drain projection 71 extends from the X1 side end of the filter unit mounting member 51 to the central part. In this embodiment, the drain projection 71 is inclined downward (towards the Z2 side) as it approaches the interior 20a side (X2 side) of the housing 20. The drain projection 71 is an example of the "interior side protruding portion" in the claims.

[0040] Furthermore, in this embodiment, the drain member 70 includes a guide opening 70a that guides the air bypassed by the drain projection 71 to the air inlet 41a side (X1 side) of the filter 41 above (Z1 side). Specifically, in addition to the drain projection 71, the drain member 70 includes an upper extension 72 extending upward (Z1 side) from the end of the drain projection 71 on the housing air inlet 21 side, and an inner extension 73 extending from the upper end (Z1 side) of the upper extension 72 towards the interior 20a side (X2 side) of the housing 20. That is, the drain member 70 is formed in a U-shape with the interior 20a side (X2 side) of the housing 20 open when viewed from the Z and X directions. Furthermore, a guide opening 70a is formed at the connection point between the upper extension portion 72 and the inner extension portion 73, connecting the space S1 on the air inlet 41a side (X1 side) of the filter 41 and the space S2 inside the U-shaped drain member 70.

[0041] With the above configuration, the path of the ventilation channel 30 is as follows: from the housing ventilation port 21 toward the housing internal ventilation port 51a, first it goes from the X1 side toward the X2 side, bypassing the water-draining projection 71, and then it goes from the Z2 side toward the Z1 side. Then it goes from the X2 side toward the X1 side, and then it goes from the Z2 side toward the Z1 side, so as to be guided to the guide opening 70a that connects the space S2 inside the U-shaped water-draining member 70 and the space S1 on the ventilation port 41a side (X1 side) of the filter 41. Then it goes from the space S1 on the ventilation port 41a side (X1 side) of the filter 41 toward the housing internal ventilation port 51a, via the filter unit 40, and goes from the X1 side toward the X2 side. In other words, in this embodiment, the ventilation channel 30 is formed in a crank shape including a plurality of sections that bend at approximately right angles (sections that bend sharply).

[0042] In this embodiment, the railway vehicle power converter 100 includes a filter cover 81 that is detachably attached to the housing 20 so as to cover the opening 23 for the filter unit. Specifically, as shown in Figure 6, the filter cover 81 is detachably attached to the housing 20 by filter cover fixing screws 92. As a result, as shown in Figure 7, the filter unit 40 housed in the filter unit housing 50 can be easily accessed by removing the filter cover 81 from the housing 20. Then, by attaching the filter unit housing 50 from the filter unit mounting member 51, the filter unit 40 can be inspected, cleaned (removed dust adhering to the filter 41), and replaced.

[0043] Furthermore, in this embodiment, the outer periphery 81a of the filter cover 81 protrudes toward the outside side (X1 side) of the housing 20. Specifically, the filter cover 81 is bent so that the outer periphery 81a of the filter cover 81 protrudes toward the X2 side.

[0044] Furthermore, in this embodiment, the railway vehicle power converter 100 includes a sealing member 82 provided between the outer periphery 81a of the filter cover 81 and the outer periphery 50a of the filter unit housing 50. Specifically, the sealing member 82 is formed in a frame shape that includes an opening slightly larger than the opening 23 for the filter unit. The filter cover 81 is then attached to the housing 20 by filter cover fixing screws 92, with the sealing member 82 sandwiched between the outer periphery 81a of the filter cover 81 and the outer periphery 50a of the filter unit housing 50.

[0045] (Effects of the embodiment) In this embodiment, the following effects can be obtained.

[0046] In this embodiment, as described above, the filter 41, which is positioned in the ventilation channel 30 that allows air to pass between the inside 20a of the housing 20 and the outside of the housing 20, is positioned offset from the housing vent 21 when viewed from the housing vent 21 side (X1 side), which serves as the inlet of the ventilation channel 30. As a result, the path from the housing vent 21 to the filter 41 in the ventilation channel 30 is not at least straight, and the distance from the housing vent 21 to the filter 41 in the ventilation channel 30 tends to be longer compared to the case where the filter 41 is installed so as to cover the housing vent 21 (when the filter 41 is positioned not offset from the housing vent 21 when viewed from the housing vent 21 side (X1 side)). As a result, dust that enters from the housing vent 21 is less likely to reach the filter 41. Consequently, clogging of the filter 41 by dust that enters from the housing vent 21 can be suppressed.

[0047] Furthermore, in this embodiment, as described above, the housing vent 21 is provided on the side surface 22a of the housing 20. The filter 41 is positioned higher than the housing vent 21. As a result, the path from the housing vent 21 to the filter 41 in the ventilation channel 30 includes a portion that goes from the lower side (Z2 side) to the upper side (Z1 side), so in addition to dust that enters through the housing vent 21, water that enters through the housing vent 21 can be prevented from reaching the filter 41 at the top (Z1 side). Therefore, the configuration in which the housing vent 21 is provided on the side surface 22a of the housing 20 and the filter 41 is positioned higher than the housing vent 21 is particularly effective in a railway vehicle power converter 100 that is installed in a location that is easily exposed to wind and rain in a railway vehicle 110.

[0048] Furthermore, in this embodiment, as described above, the railway vehicle power converter 100 is provided between the filter 41 and the housing vent 21, and includes a water-draining member 70 which includes a water-draining projection 71 that extends beyond the vent inlet 41a of the filter 41 to the inside 20a side (X2 side) of the housing 20, so as to bypass the air that flows in through the housing vent 21. As a result, the path from the housing vent 21 to the filter 41 in the ventilation channel 30 includes a large bend due to the protrusion of the water-draining projection 71, and the distance from the housing vent 21 to the filter 41 in the ventilation channel 30 is increased, so compared to the case where there is no water-draining projection 71, dust and water entering from the housing vent 21 are less likely to reach the filter 41. As a result, it is possible to further suppress dust and water entering from the housing vent 21 from reaching the filter 41.

[0049] Furthermore, in this embodiment, as described above, the drainage projection 71 is inclined downward (towards Z2) as it approaches the interior 20a side (X2 side) of the housing 20. As a result, the drainage projection 71 is inclined downward (towards Z2) as it approaches the interior 20a side (X2 side) of the housing 20, causing a larger detour. Compared to the case where the drainage projection 71 is not inclined downward (towards Z2) as it approaches the interior 20a side (X2 side) of the housing 20, dust and water entering from the housing vent 21 are less likely to reach the filter 41. In addition, water entering from the housing vent 21 and heading towards the interior 20a side (X2 side) of the housing 20 is more likely to hit the drainage projection 71 which is inclined downward (towards Z2) and fall downward (towards Z2), thus effectively suppressing water entering from the housing vent 21 from reaching the filter 41 above (towards Z1).

[0050] Furthermore, in this embodiment, as described above, the drain member 70 includes a guide opening 70a that guides the air that has been bypassed by the drain projection 71 to the air inlet 41a side (X1 side) of the filter 41 above (Z1 side). This makes it possible to easily guide the air that has flowed in through the housing vent 21 and been bypassed by the drain projection 71 to the air inlet 41a side (X1 side) of the filter 41 (and thus to the filter 41) via the guide opening 70a.

[0051] Furthermore, in this embodiment, as described above, the railway vehicle power converter 100 includes a filter enclosure member 42 that surrounds the filter 41 and, together with the filter 41, constitutes the filter unit 40. The railway vehicle power converter 100 also includes a recessed filter unit housing section 50 provided on the side surface 22a of the housing 20, in which the filter unit 40 is housed. The filter unit housing section 50 is positioned higher than the housing vent 21. As a result, the filter unit 40 housed in the filter unit housing section 50 is positioned higher than the housing vent 21, so even when the filter 41 constitutes the filter unit 40 (the filter 41 is unitized), the filter 41 can be reliably positioned higher than the housing vent 21. In addition, since the filter 41 is unitized while surrounded by the filter enclosure member 42, the filter unit 40 can be easily positioned in the ventilation passage 30 compared to when the filter 41 is not unitized (exposed).

[0052] Furthermore, in this embodiment, as described above, the filter unit 40 includes a unit ventilation inlet 43 provided on the outside side (X1 side) of the housing 20. The unit ventilation inlet 43 is positioned higher than the lower end portion 40a of the filter unit 40. As a result, compared to the case where the unit ventilation inlet 43 is located at the lower end portion 40a of the filter unit 40, dust and water entering from the housing ventilation opening 21 are less likely to reach the unit ventilation inlet 43. Consequently, it is possible to further suppress dust and water entering from the housing ventilation opening 21 from reaching the filter 41.

[0053] Furthermore, in this embodiment, as described above, the filter unit 40 further includes a unit ventilation outlet 44 provided on the interior 20a side (X2 side) of the housing 20 at approximately the same height as the unit ventilation inlet 43. The filter unit housing section 50 also includes an interior housing ventilation port 51a that leads to the interior 20a of the housing 20. The unit ventilation outlet 44 is provided adjacent to the interior housing ventilation port 51a at approximately the same height as the interior housing ventilation port 51a. As a result, the path between the filter 41 and the interior housing ventilation port 51a in the ventilation passage 30 becomes linear, and the distance from the filter 41 to the interior housing ventilation port 51a in the ventilation passage 30 becomes relatively short. Consequently, in the ventilation passage 30, it is possible to suppress the complexity and excessive length of the portion that does not contribute to preventing dust and water entering from the housing ventilation port 21 from reaching the filter 41 (the portion between the filter 41 and the interior housing ventilation port 51a in the ventilation passage 30).

[0054] Furthermore, in this embodiment, as described above, the housing 20 is provided at a position corresponding to the filter unit housing 50 and includes a filter unit opening 23 for removing the filter unit 40 from the filter unit housing 50. The railway vehicle power converter 100 is equipped with a filter cover 81 that is detachably attached to the housing 20 so as to cover the filter unit opening 23. As a result, the filter unit 40 can be easily removed from the filter unit housing 50 via the filter unit opening 23 by removing the filter cover 81 from the housing 20. Consequently, the filter 41 constituting the filter unit 40 can be easily inspected, cleaned (removed dust adhering to the filter), and replaced.

[0055] Furthermore, in this embodiment, as described above, the railway vehicle power converter 100 includes a sealing member 82 provided between the outer periphery 81a of the filter cover 81 and the outer periphery 50a of the filter unit housing 50. The outer periphery 81a of the filter cover 81 protrudes toward the outside side (X1 side) of the housing 20. As a result, the sealing member 82 provided between the outer periphery 81a of the filter cover 81 and the outer periphery 50a of the filter unit housing 50 can prevent water from entering the filter unit housing 50 from between the outer periphery 81a of the filter cover 81 and the outer periphery 50a of the filter unit housing 50. In addition, the protrusion of the outer periphery 81a of the filter cover 81 improves the rigidity of the outer periphery 81a of the filter cover 81, so that bending of the outer periphery 81a of the filter cover 81 can be prevented when the sealing member 82 is sandwiched between the outer periphery 81a of the filter cover 81 and the outer periphery 50a of the filter unit housing 50. As a result, the formation of a gap between the outer periphery 81a of the filter cover 81 and the outer periphery 50a of the filter unit housing 50 can be suppressed, thereby effectively preventing water from entering the filter unit housing 50 from the gap between the outer periphery 81a of the filter cover 81 and the outer periphery 50a of the filter unit housing 50.

[0056] Furthermore, in this embodiment, as described above, the ventilation passage 30 is configured to allow air to circulate between the inside 20a of the housing 20 and the outside of the housing 20 in order to suppress the pressure difference between the inside 20a of the housing 20 and the outside of the housing 20. As a result, the ventilation passage 30 can suppress the pressure difference between the inside 20a of the housing 20 and the outside of the housing 20 when the railway vehicle 110 enters or exits a tunnel, thereby suppressing the load caused by the pressure difference on the housing 20 and the power conversion unit 10 etc. housed in the housing 20.

[0057] [Differentiation] The embodiments disclosed herein should be considered in all respects to be illustrative and not restrictive. The scope of the present invention is indicated by the claims rather than the description of the embodiments above, and further includes all modifications (modifications) within the meaning and scope equivalent to the claims.

[0058] For example, in the above embodiment, an example was shown in which the outer peripheral portion 81a of the filter cover 81 protrudes toward the outside side (X1 side) of the housing 20, but the present invention is not limited to this. In the present invention, the outer peripheral portion of the filter cover may or may not protrude toward the inside side of the housing (it may be flat).

[0059] Furthermore, although the above embodiment shows an example in which the power converter for railway vehicles 100 includes a sealing member 82 provided between the outer periphery 81a of the filter cover 81 and the outer periphery 50a of the filter unit housing 50, the present invention is not limited to this. In the present invention, the power converter for railway vehicles does not need to include the above sealing member.

[0060] Furthermore, in the above embodiment, the housing 20 is provided at a position corresponding to the filter unit housing 50 and includes a filter unit opening 23 for removing the filter unit 40 from the filter unit housing 50, and the railway vehicle power converter 100 is provided with a filter cover 81 that is detachably attached to the housing 20 so as to cover the filter unit opening 23. However, the present invention is not limited to this. In the present invention, the housing does not include the above-mentioned filter unit opening, and the railway vehicle power converter does not need to be provided with the above-mentioned filter cover.

[0061] Furthermore, in the above embodiment, an example was shown in which the unit ventilation outlet 44 provided on the interior 20a side (X2 side) of the housing 20 in the filter unit 40 is provided adjacent to the housing internal ventilation opening 51a, which leads to the interior 20a of the housing 20, at approximately the same height position as the housing internal ventilation opening 51a. However, the present invention is not limited to this. In the present invention, the unit ventilation outlet may be provided so as not to be adjacent to the upper housing internal ventilation opening, or it may be provided at a different height position from the housing internal ventilation opening.

[0062] Furthermore, in the above embodiment, the unit ventilation inlet 43 provided on the external side (X1 side) of the housing 20 in the filter unit 40 is shown to be located at the central part 40b of the filter unit 40, at a position higher than the lower end portion 40a of the filter unit 40 in the Z direction (vertical direction), but the present invention is not limited to this. In the present invention, the unit ventilation inlet and the unit ventilation outlet may be located at the upper end of the filter unit.

[0063] Furthermore, in the above embodiment, an example was shown in which the unit ventilation inlet 43 provided on the outside side (X1 side) of the housing 20 and the unit ventilation outlet 44 provided on the inside side 20a (X2 side) of the housing 20 are each positioned higher than the lower end portion 40a of the filter unit 40. However, the present invention is not limited to this. In the present invention, the unit ventilation inlet and the unit ventilation outlet may be located at the lower end portion of the filter unit.

[0064] Furthermore, in the above embodiment, an example was shown in which the filter unit 40 includes a unit ventilation inlet 43 provided on the outside side (X1 side) of the housing 20 and a unit ventilation outlet 44 provided on the inside side 20a (X2 side) of the housing 20 at approximately the same height as the unit ventilation inlet 43, but the present invention is not limited thereto. In the present invention, the filter unit may include the above-mentioned unit ventilation inlet and a unit ventilation outlet provided on the outside side of the housing at a different height from the above-mentioned unit ventilation inlet.

[0065] Furthermore, although the above embodiment shows an example in which the filter unit housing 50 is positioned higher than the housing vent 21, the present invention is not limited to this. In the present invention, as long as the filter constituting the filter unit is positioned higher than the housing vent, the filter unit housing may be positioned at the same height as the housing vent.

[0066] Furthermore, in the above embodiment, an example was shown in which the power converter for railway vehicles 100 includes a filter enclosure member 42 that surrounds the filter 41 and together with the filter 41 constitutes a filter unit 40, but the present invention is not limited to this. In the present invention, the power converter for railway vehicles does not have to include the above-mentioned filter enclosure member. That is, the filter does not have to be surrounded by the filter enclosure member (it does not have to be unitized).

[0067] Furthermore, in the above embodiment, the draining member 70 (protruding member) includes a draining protrusion 71 (internal protrusion) that extends beyond the air inlet 41a of the filter 41 to the interior 20a side (X2 side) of the housing 20 so as to bypass the air flowing in through the housing vent 21, and includes a guide opening 70a that guides the air bypassed by the draining protrusion 71 (internal protrusion) to the air inlet 41a side (X1 side) of the filter 41 above (Z1 side). However, the present invention is not limited to this. In the present invention, the protruding member does not have to include the guide opening. In that case, the air bypassed by the internal protrusion may be guided to the air inlet side of the filter above through a portion other than the guide opening.

[0068] Furthermore, in the above embodiment, an example was shown in which the water-draining protrusion 71 (internal protrusion) that extends beyond the air inlet 41a of the filter 41 to the interior 20a side (X2 side) of the housing 20, so as to bypass the air flowing in through the housing vent 21, is inclined downward (towards the Z2 side) as it approaches the interior 20a side (X2 side) of the housing 20. However, the present invention is not limited to this. In the present invention, the internal protrusion may be inclined upward as it approaches the interior side of the housing, or it may not be inclined as it approaches the interior side of the housing.

[0069] Furthermore, in the above embodiment, the power converter for railway vehicles 100 is shown to include a water-draining member 70 (protruding member) that includes a water-draining protruding portion 71 (internal protruding portion) that extends beyond the air inlet 41a of the filter 41 to the inside 20a side (X2 side) of the housing 20, so as to bypass the air that flows in through the housing air inlet 21. However, the present invention is not limited to this. In the present invention, the power converter for railway vehicles does not need to include the above-mentioned protruding member including the internal protruding portion.

[0070] Furthermore, although the above embodiment shows an example in which the filter 41 is positioned higher than the housing vent 21, the present invention is not limited to this. In the present invention, the filter may be positioned lower than the housing vent, or at the same height as the housing vent. In that case, it is preferable that the power converter for railway vehicles is installed in a position in the railway vehicle that is less likely to be exposed to wind and rain.

[0071] Furthermore, although the above embodiment shows an example in which the railway vehicle power converter 100 is installed in a position on the railway vehicle 110 that is easily exposed to wind and rain, the present invention is not limited to this. In the present invention, the railway vehicle power converter may be installed in a position on the railway vehicle that is less likely to be exposed to wind and rain.

[0072] Furthermore, although the above embodiment shows an example in which the housing ventilation opening 21 is provided on the side surface 22a of the housing 20, the present invention is not limited to this. In the present invention, the housing ventilation opening may be provided on the top surface or the bottom surface of the housing.

[0073] Furthermore, in the above embodiment, an example was shown in which the ventilation channel 30 is configured to allow ventilation between the inside 20a of the housing 20 and the outside of the housing 20 in order to suppress the pressure difference between the inside 20a of the housing 20 and the outside of the housing 20, but the present invention is not limited to this. In the present invention, the ventilation channel may be configured to allow ventilation between the inside of the housing and the outside of the housing in order to cool the power conversion unit housed inside the housing.

[0074] Furthermore, although the above embodiment shows an example in which the railway vehicle power converter 100 is mounted on the lower side (Z2 side) of the bottom 111a of the vehicle body 111, the present invention is not limited to this. In the present invention, the railway vehicle power converter may be located at other positions on the vehicle body.

[0075] Furthermore, although the above embodiment shows an example in which only one housing ventilation opening 21 is provided in the housing 20, the present invention is not limited to this. In the present invention, multiple housing ventilation openings may be provided in the housing.

[0076] Furthermore, although the above embodiment shows an example in which the filter 41 is positioned so as to not overlap with the housing vent 21 when viewed from the housing vent 21 side (X1 side), the present invention is not limited to this. In the present invention, a part of the filter may be positioned so as to overlap with the housing vent when viewed from the housing vent. [Explanation of Symbols]

[0077] 10 Power conversion unit 20 cabinets 20a Inside (the enclosure) 21. Ventilation holes for the enclosure 22 (Outer surface of the enclosure) 22a Side of the enclosure (of the enclosure) 23 Opening for filter unit 30 Ventilation channel 40 filter units 40a Lower end (of the filter unit) 41 Filters 41a (Filter) Vent Inlet 42 Filter enclosure member 43 Unit ventilation inlet 44 Unit Vent Outlet 50 Filter unit housing 50a Outer periphery (of the filter unit housing) 51a Internal ventilation openings for the enclosure 70. Drainage component (protruding component) 70a Guide opening 71. Drainage protrusion (internal protrusion) 81 Filter Cover 81a Outer periphery (of the filter cover) 82 sealing member 100 Power converter for railway vehicles 110 Railway Vehicles

Claims

1. A power converter for railway vehicles, which is installed on railway vehicles, Power conversion unit, A housing for the aforementioned power conversion unit, A filter is placed in a ventilation channel that allows air to pass between the inside of the housing and the outside of the housing, A filter enclosure member that surrounds the filter and, together with the filter, constitutes a filter unit, The housing comprises a recessed filter unit housing section provided on the side surface of the housing, in which the filter unit is housed, The housing is provided on the outer surface of the housing so as to be exposed to the outside of the housing, and includes a housing vent as an inlet for the ventilation passage, The filter is positioned offset from the housing vent when viewed from the housing vent side. The housing is provided at a position corresponding to the filter housing and includes an opening for the filter unit for removing the filter unit from the filter unit housing, A power conversion device for railway vehicles, further comprising a filter cover that is detachably attached to the housing so as to cover the opening for the filter unit.

2. The aforementioned housing ventilation opening is provided on the side of the housing, The power conversion device for railway vehicles according to claim 1, wherein the filter is positioned higher than the housing vent.

3. The power conversion device for a railway vehicle according to claim 2, further comprising a protruding member provided between the filter and the housing vent, and including an internal protruding portion that extends beyond the vent inlet of the filter to the inside of the housing so as to bypass the air that has flowed in through the housing vent.

4. The power conversion device for railway vehicles according to claim 3, wherein the internal protruding portion is inclined downward as it approaches the inside of the housing.

5. The power conversion device for railway vehicles according to claim 3 or 4, wherein the protruding member further includes a guide opening that directs the air bypassed by the internal protruding portion towards the air inlet side of the filter above.

6. The power conversion device for railway vehicles according to any one of claims 2 to 5, wherein the filter unit housing is located at a higher position than the housing vent.

7. The filter unit includes a unit ventilation inlet provided on the outside of the housing, The power conversion device for railway vehicles according to claim 6, wherein the unit ventilation inlet is positioned higher than the lower end of the filter unit.

8. The filter unit further includes a unit ventilation outlet provided on the inside of the housing at approximately the same height as the unit ventilation inlet, The filter unit housing section includes an internal vent that leads to the inside of the housing, The power conversion device for railway vehicles according to claim 7, wherein the unit ventilation outlet is provided adjacent to the internal ventilation opening of the housing at approximately the same height as the internal ventilation opening of the housing.

9. The filter cover is further provided with a sealing member located between the outer periphery and the outer periphery of the filter unit housing, The power conversion device for railway vehicles according to claim 1, wherein the outer periphery of the filter cover protrudes toward the outside of the housing.

10. The power conversion device for railway vehicles according to any one of claims 1 to 9, wherein the ventilation passage is configured to allow ventilation between the inside of the housing and the outside of the housing in order to suppress the pressure difference between the inside of the housing and the outside of the housing.

11. A power converter for railway vehicles, which is installed on railway vehicles, Power conversion unit, A housing for the aforementioned power conversion unit, The enclosure comprises a filter arranged in a ventilation channel that allows air to pass between the inside of the enclosure and the outside of the enclosure, The housing is provided on the outer surface of the housing so as to be exposed to the outside of the housing, and includes a housing vent as an inlet for the ventilation passage, The filter is positioned offset from the housing vent when viewed from the housing vent side. The aforementioned ventilation channel includes a plurality of substantially right-angle bends in the portion between the housing vent and the filter, forming a crank shape that extends from the lower side to the upper side, in a power conversion device for railway vehicles.

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