JP4549086B2 - Running wind cooling system for railway vehicles - Google Patents

Description

  The present invention relates to a traveling wind cooling apparatus for a railway vehicle having a circulation cooling system in which a heat receiving section and a heat radiating section are connected by piping and a refrigerant is circulated by a pump to transport generated heat and the traveling wind is taken into the heat radiating section and cooled. In particular, the present invention relates to a traveling wind cooling device for a railway vehicle that can reduce the size of the power conversion device and improve the cooling performance.

  FIG. 8 is a perspective view of a traveling wind cooling power conversion device 26 for a railway vehicle having a conventional structure, which is described in FIGS. 25 to 27 of Japanese Patent Application Laid-Open No. 2003-48533, and that performs cooling using traveling wind. . A power unit 23 is disposed inside the power conversion device 26.

  The power unit 23 includes a semiconductor element 3, a heat block 20, a cooling fin 21, and a heat pipe 22. The heat generated by the element 3 is transported to the cooling fins 21 using the heat conduction principle and cooled by the traveling wind flowing on the lower surface of the vehicle floor. At the same time, it is transported to the heat pipe 22 using the boiling latent heat transport principle. It is cooled by the driving wind taken from

  The heat conduction principle or boiling latent heat transport principle is used to transport the generated heat of the element to the vehicle floor and to the side, but in order to efficiently transport heat using these heat transport means, it is a heat receiving part. It is necessary to arrange the heat block 20, the cooling fins 21 that are heat radiating portions, and the heat pipe 22 in the very vicinity.

  For this reason, the power unit 23 is planarly arranged at the lower part or the side part inside the power conversion device 26 so as to face the vehicle floor under which the traveling wind can be taken in and the vehicle side surface. Due to the restriction of the planar power unit 23 arrangement, there has been a limit to downsizing the power converter 26.

  The underfloor cover opening 24 for taking in the traveling wind is rectangular, and the air guide 25 arranged inside the opening 24 has a linearly inclined shape.

  When the traveling wind 27 flowing along the vehicle side surface is taken in from the opening 24, generally, the separation of the flow tends to occur at the end surface of the opening 24, so the inclination angle with respect to the flow of the air guide 25 is as small as possible. There is a need to. In general, the angle at which peeling does not occur is reported to be 7 ° or less. However, since the traveling wind is taken into the entire surface of the heat pipe 22, the inclination angle with respect to the flow of the wind guide guide 25 is increased to 7 ° or more, and peeling occurs to deteriorate the traveling wind intake efficiency.

Further, with the rectangular opening 24 provided in the underfloor cover, fluid separation at the edge of the opening becomes large, and the running wind intake efficiency is deteriorated.
JP 2003-48533 A

  As described above, in the power conversion device that cools using traveling wind, power conversion is performed in the cooling method using the cooling fins 21 and the heat pipes 22 that transport the generated heat using the heat conduction principle or the boiling latent heat transport principle. There is a problem that the device cannot be miniaturized.

  Further, the shape of the underfloor cover opening 24 for taking in the traveling wind and the shape of the air guide 25 are the shapes that promote fluid separation, and the traveling wind intake efficiency is deteriorated to lower the cooling performance. There's a problem.

  A first object of the present invention is to provide a traveling wind cooling device for a railway vehicle having a cooling system that enables downsizing of the outer shape of the power converter.

  A second object of the present invention is to provide a traveling wind intake shape that enables an improvement in cooling performance.

In order to achieve the above object, in the present invention, circulating cooling using a forced heat transport system that receives the generated heat of the element using a refrigerant and transports heat to the heat radiating portion via a pipe by the power of the pump. I try to build a system. That is, a heat receiving part provided with a passage for circulating the refrigerant, a heat radiating part provided in a flow path through which the traveling wind flows, and a flow path for circulating the refrigerant between the heat radiating part and the heat receiving part. The flow path through which the traveling wind flows is provided to be recessed toward the inside of the vehicle body from an underfloor cover that is provided continuously on the surface of the vehicle body at the bottom of the vehicle body.

  Therefore, the heat receiving portion and the heat radiating portion can be arranged at any part of the power conversion device, and can be connected by a pipe between them, and the power conversion device can be miniaturized by effectively using the space under the vehicle floor.

  Further, in the present invention, the heat radiating portion is disposed inside the vehicle body underfloor cover, and openings for taking in the traveling wind are provided on both sides thereof.

  Therefore, since the heat radiation part can be arranged at the position where the traveling wind flowing on the side of the vehicle is most easily captured, the traveling wind that can be captured can be expected to greatly improve the cooling performance, and the heat radiation part can be downsized and the pump capacity can be reduced. Therefore, the power converter as a whole can be downsized.

  Furthermore, in the present invention, an additional heat dissipating part is arranged in the refrigerant circulation cooling system so that a part of the cooling air from equipment other than the power converter installed in the vehicle is forcibly guided to the heat dissipating part. ing.

  Therefore, it is possible to obtain additional cooling air in addition to securing the cooling air by the traveling air, and it is possible to improve the cooling performance.

  Furthermore, in this invention, it is set as the structure which expands a driving | running | working wind intake port shape gradually with respect to a driving | running | working wind inflow direction.

  Therefore, the separation of the traveling wind fluid occurs only at one point at the front end of the opening, and it can be taken in while the traveling wind is gradually trapped at the two ends of the shape, and the cooling performance is improved by improving the traveling wind introduction efficiency. Can be improved.

  Furthermore, in the present invention, the heat dissipating section capacity necessary for cooling is gathered in a state secured in the same manner as in the invention for claim 1, and the ventilation direction is arranged parallel to the vehicle traveling direction.

Therefore, since the heat radiating part can be shortened with respect to the traveling direction of the vehicle, the power converter can be downsized.
Furthermore, in this invention, it forms so that the inclination of a wind guide may be made into multiple steps | paragraphs.
Therefore, since the fluid of the traveling wind does not change sharply with respect to the flow direction, it is difficult to peel off, more traveling wind can be taken in, and the cooling performance can be improved.

As described above, according to the power conversion device provided with the traveling wind cooling device for railway vehicles of the present invention, the heat receiving portion and the heat radiating portion are connected by a pipe and the generated refrigerant is circulated by a pump to transport the generated heat. Since a circulating cooling system that takes in and cools the running air into the heat radiating section is used, the apparatus can be downsized and the cooling performance can be improved.

  Furthermore, since the heat radiating portion is arranged on the side surface of the vehicle, cleaning work such as during periodic vehicle inspections can be easily performed, and maintenance can be saved.

  The present invention relates to a railway vehicle power conversion device that cools equipment generated heat using traveling wind obtained by traveling of a vehicle, and connects a heat receiving portion and a heat radiating portion with a pipe and circulates a refrigerant by a pump. By constructing a circulating cooling system that transports the generated heat and cools the running air by taking it into the heat radiating section, the power conversion device can be miniaturized. In addition, the structure of the traveling wind intake portion is optimized from the viewpoint of fluid dynamics, and more traveling wind is guided to improve the cooling performance.

  Hereinafter, embodiments of the present invention based on the above-described concept will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a perspective view (apparatus perspective view from the bottom of a vehicle body) showing an example of the configuration of a power conversion device provided with a traveling wind cooling device for a railway vehicle according to the present embodiment. FIG. 2 shows only the power conversion device in FIG. FIG. 7 is a perspective view showing only the heat receiving portion of FIG. 2 so that the internal structure can be seen. FIG. 1, FIG. 2, and FIG. 7 are used for the first embodiment. I will explain.

  In FIG. 7, the semiconductor element 3 that generates heat is mounted on the heat receiving portion 4. A flow path 17 is provided inside the heat receiving portion 4 so that a refrigerant for transporting heat can circulate. When the refrigerant flows through the flow path 17 and passes through the heat receiving portion 4, the heat generated by the semiconductor element 3 is absorbed and heat transport is performed. The heat receiving portion 4 is, for example, a structure in which a heat sink made of metal or the like is laminated on an insulating substrate on which the semiconductor element 3 is mounted, or an insulating layer such as an enamel is provided on the surface of the metal substrate, The heat dissipation plate or the metal substrate has a structure in which a coolant channel is provided inside or on the surface thereof.

  In FIG. 2, the power unit 5 is the center of the power conversion unit, but is composed of a large number of electrical components including semiconductor elements. Of the many electrical components, the component that generates the most heat and needs to be cooled is the semiconductor element 3. The mounting form is as shown in FIG. 7, and the refrigerant circulation pipe 28 is connected to the power unit 5. The generated heat is transported to the heat radiating section 7 by pumping the refrigerant with the pump 6.

  The heat dissipating part 7 is arranged in a space efficient manner inside the vehicle floor lower cover 10. Normally, this space is limited due to restrictions on the vehicle body shape, so it is narrow and difficult to mount equipment, but the heat radiation part 7 is long and narrow in order to ensure cooling performance. This narrow space can be used effectively and arranged. The heat dissipating part 7 bends a pipe serving as a flow path through which the refrigerant flows a number of times in a predetermined space (for example, a space of the heat dissipating part indicated by reference numeral 7 in FIG. 2), and a fluid flowing through the space (more specifically, In this configuration, the surface area in contact with the traveling wind) is as large as possible.

  An opening 11 is provided in the underfloor cover 10 in order to take the traveling wind into the heat radiating unit 7. An air guide 13 is provided to guide the traveling air to the heat radiating section 7. The traveling wind flows along the vehicle body underfloor cover 10, but the flow is bent along the wind guide 13 connected to the opening 11 and is guided to the heat radiating unit 7.

  The opening 11 has a rectangular shape, and the air guide 13 is formed at an angle that allows the traveling air to pass through the entire heat radiating portion 7. When the flow is bent along the wind guide 13, if the angle of the wind guide 13 is steep, the flow cannot be bent completely and peels off, reducing the amount of running air taken in, and lowering the cooling performance. In general, the separation limit angle is said to be 7 °. However, in the first embodiment, the separation limit angle is 7 ° or more, and flow separation may occur in the boundary layer. As long as space in the direction allows, it is desirable to make the angle smaller than the peeling limit angle. Further, in the illustrated example, the power conversion device 2 that is a heat source and the heat radiating unit 7 are provided so as to be substantially aligned in the traveling direction of the vehicle, but by shifting these positions in the traveling direction of the vehicle, And the restriction | limiting of the dimension to the width direction of heat generating sources, such as the power converter device 2, can be eased by the part corresponding to the space to the width direction for providing the thermal radiation part 7. FIG. Further, since the heat generated in the heat source is released from the heat radiating portion 7 to the outside, there is no need to consider the air permeability of the heat source itself, and therefore the inside of the cover provided in consideration of the air resistance, etc. The heat generation source can be disposed in a space with poor ventilation, such as in the body or under the floor.

  Next, the operation of the traveling wind cooling apparatus for railway vehicles according to the present embodiment configured as described above will be described.

  In FIG. 2, the power unit 5 and the pump 6 can be arranged at any location inside the power conversion device 2. In this Embodiment, it arrange | positions so that the length direction of the power converter device 2 may be made the smallest with respect to the vehicle advancing direction. In the prior art of FIG. 8, since the arrangement of the power unit 23 is restricted, there is a limit in reducing the length of the power conversion device 26 in the vehicle traveling direction, but in this embodiment, the length is reduced. It becomes possible.

  Further, the heat dissipating part 7 is provided not at the inside of the power conversion device 2 but at a position slightly inside the surface of the vehicle body 1 such as slightly inside the underfloor cover 10, so that the vehicle underfloor cover is difficult to mount equipment narrowly. It can be effectively placed in the inner space. For this reason, it is not necessary to store the heat radiating part 7 in the power converter 2, and further miniaturization becomes possible.

(Second Embodiment)
FIG. 3 is a perspective view showing an example of the configuration of the power conversion device provided with the traveling wind cooling device for railway vehicles according to the present embodiment. The same reference numerals are given to the same elements as those in FIG. 2 and the description thereof is omitted, and only different parts will be described here.

  In FIG. 3, an additional heat dissipating part 9 is arranged in the circulation cooling system. An electrical equipment device (other electrical equipment) 16 other than the power conversion device 2 mounted under the floor is disposed in the vicinity of the heat radiating unit 9.

Next, the operation of the power conversion device including the traveling wind cooling device for railway vehicles according to the present embodiment configured as described above will be described.

  Since a part of the cooling air 19 of the electrical equipment device 16 forcibly passes through the heat radiating section 9, it is possible to improve the cooling performance. Moreover, there are no restrictions on the number, arrangement position, and combination of the additional heat dissipating section 9 and the electrical equipment device 16 and can be arbitrarily increased, and further cooling performance can be improved.

(Third embodiment)
FIG. 4 is a perspective view of the traveling wind inlet shape in the configuration example of the traveling wind cooling apparatus for railway vehicles according to the present embodiment. The same elements as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted. Only different parts will be described here.

  In FIG. 4, the shape of the opening 12 is a shape in which the width is gradually increased with respect to the traveling wind inflow direction. Since the railway vehicle travels in both directions, the opening shape is symmetrical, and the opening width is gradually increased with respect to each traveling direction.

  Next, the operation of the traveling wind cooling apparatus for railway vehicles according to the present embodiment configured as described above will be described.

  In the part where the traveling wind reaches the intake port, fluid entrainment or separation occurs. The traveling wind stream line 30 in FIG. 4 is obliquely in contact with a portion reaching the opening 12 with respect to the inflow direction, so that the entrainment phenomenon occurs and promotes the traveling wind inflow. On the other hand, in the rectangular opening 11 in FIG. 2, when the angle of the air guide 13 is large, the traveling wind stream line 28 peels off at the opening width portion at the inflow tip, and the traveling wind stream line 29 has the opening width. Are parallel to each other, the entrainment phenomenon may be reduced, and traveling wind inflow may not be promoted.

  Based on the above-mentioned idea, it is desirable to reduce the resistance of the flow path of the traveling wind using a shape (NACA model) developed in the United States.

(Fourth embodiment)
FIG. 5 is a perspective view of the heat dissipating part in the configuration example of the traveling wind cooling apparatus for railway vehicles according to this embodiment. The same reference numerals are given to the same elements as those in FIG. 2 and the description thereof is omitted, and only different parts will be described here.
In FIG. 5, the ventilation direction of the heat radiating portion 8 is arranged in parallel to the vehicle traveling direction.

  Next, the operation of the traveling wind cooling apparatus for railway vehicles according to the present embodiment configured as described above will be described.

  The heat dissipating part 8 secures a heat dissipating area similar to that of the heat dissipating part 7 in FIG. 2, and the cooling performance is the same. Since the outer length in the traveling wind inflow direction is reduced, the space that combines the heat radiating portion and the air guiding portion can be reduced in size. About the heat radiating part shape, both the heat radiating part 7 and the heat radiating part 8 can be selected in accordance with the restrictions on the mounting of the vehicle, and the degree of freedom of the structure is increased.

(Fifth embodiment)
FIG. 6 is a perspective view of the wind guide in the configuration example of the power conversion device provided with the traveling wind cooling device for railway vehicles according to the present embodiment. The same elements as those in FIG. 2 are denoted by the same reference numerals, and the description thereof is omitted. Only different parts will be described here.

  In FIG. 6, the air guide 15 changes the inclination angle in a plurality of stages with respect to the inflow direction.

  Next, the operation of the traveling wind cooling apparatus for railway vehicles according to the present embodiment configured as described above will be described.

  In FIG. 2, when the flow is bent along the wind guide 13, if the angle of the wind guide 13 is steep, the flow cannot be bent and is separated to reduce the intake amount of the traveling wind and cool down. Incurs performance degradation. Generally, the separation limit angle is said to be 7 °. However, in the first embodiment, the separation limit angle is 7 ° or more, and there is a possibility that flow separation occurs and resistance increases.

In FIG. 6, the traveling wind inflow front end portion has an angle of 7 ° or less as a certain separation limit angle, and the traveling wind is guided so that there is no separation. Thereafter, the air guide is further inclined at an angle of 7 ° or less at the intermediate point to guide the heat to the heat radiating portion 7 . When the size of the air guide is limited, the inclination angle is changed in a plurality of stages to make it difficult for the separation to occur and to improve the running air introduction efficiency. In the actual implementation stage, it is not limited to 7 ° because of the relationship between the fluid viscosity and the surface roughness of the structure.

(Other embodiments)
It should be noted that the present invention can be implemented with various modifications without departing from the spirit of the invention at the stage of implementation, and can be implemented in appropriate combinations. When combined, the combined effect can be obtained. The cooling device of the present application can also be used for cooling other heat sources than the power conversion device. In addition, by disposing the heat dissipating part relative to the heat receiving part and connecting them with a flow path (pipe used as a flow path) having an appropriate gradient, If a method is adopted in which the refrigerant evaporated by heat is moved to the upper heat radiating section, and the refrigerant cooled and liquefied by the heat radiating section is returned to the heat receiving section along the inclination of the flow path by gravity, the refrigerant pump is omitted. Alternatively, the load required for driving the pump can be minimized. Further, the heat receiving part and the heat radiating part do not have to be in a one-to-one relationship, and the refrigerant supplied from a plurality of heat receiving parts may be concentrated and radiated by one heat radiating part, or from a single heat receiving part. The supplied refrigerant may be dispersed in a plurality of heat dissipating parts to dissipate heat.

The perspective view which shows the 1st form of the running wind cooling device for rail vehicles by this invention. The perspective view which displayed only the power converter device of FIG. 1 so that an internal structure could be understood. The perspective view which shows the 2nd form of the running wind cooling device for rail vehicles by this invention. The perspective view which shows the 3rd form of the running wind cooling device for rail vehicles by this invention. The perspective view which shows the 4th form of the running wind cooling device for rail vehicles by this invention. The perspective view which shows the 5th form of the running wind cooling device for rail vehicles by this invention. The perspective view which displayed only the heat receiving part of FIG. 2 so that an internal structure could be understood. A perspective view of a conventional running wind cooling device for a railway vehicle The perspective view of the power unit part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Car body 2 ... Power converter device 3 ... Semiconductor element 4 ... Heat-receiving part 5 ... Power unit 6 ... Pump 7 ... Radiation part (thin type) 8 ... Radiation part (thick type) 9 ... (Addition) Radiation part (thin type)
10 ... Underfloor cover 11 ... Opening (square) 12 ... Opening (triangular)
13 ... Guiding guide (steep angle type) 14 ... Guiding guide (steep angle type)
DESCRIPTION OF SYMBOLS 15 ... Air guide (multi-stage angle type) 16 ... Other electric equipment 17 ... Flow path 18 ... Traveling wind flow direction 19 ... Cooling air 20 ... Heat block 21 ... Cooling fin 22 ... Heat pipe (including cooling fin)
23 ... Power unit 24 ... Opening (square type)
25 ... Wind guide (steep angle type) 26 ... Power converter 27 ... Traveling wind flow direction (traveling wind stream line) 28 ... Traveling wind flow separation state 29 ... Traveling wind flow entrained condition (traveling wind stream line)
30 ... Running wind flow entrainment state (running wind stream line)

Claims (8)

A railcar traveling wind cooling apparatus that cools equipment generated heat by using traveling wind obtained by traveling of a vehicle, in which a heating element is mounted, and a heat receiving unit provided with a passage for circulating a refrigerant Part, a heat radiating part provided in a flow path through which the traveling wind flows, and a flow path for circulating the refrigerant between the heat radiating part and the heat receiving part,
The flow path through which the traveling wind flows is provided at a position entering the inside of the vehicle body from an underfloor cover continuously provided on the vehicle body surface at the bottom of the vehicle body,
The running wind cooling device for a railway vehicle, characterized in that the inclination of the wind guide arranged inside the underfloor cover opening is changed stepwise by an angle below the separation limit angle with respect to the vehicle traveling direction. In a running wind cooling device for a railway vehicle that cools equipment generated heat using running wind obtained by running of a vehicle, a heat receiving part and a heat radiating part are connected by piping, and a refrigerant is circulated by a pump to generate the generated heat. It has a circulating cooling system that transports and cools the running air by taking it into the heat dissipation part,
The flow path through which the traveling wind flows is provided at a position entering the inside of the vehicle body from an underfloor cover continuously provided on the vehicle body surface at the bottom of the vehicle body,
A running wind cooling device for a railway vehicle, wherein the inclination of the wind guide arranged inside the underfloor cover opening is changed stepwise by a step below the separation limit angle with respect to the vehicle traveling direction.   The travel wind cooling device for a railway vehicle according to claim 1 or 2, wherein the heat receiving portion is provided below the floor of the vehicle further inside the flow path of the travel wind. The running wind cooling device for a railway vehicle according to any one of claims 1 to 3, wherein the heat radiating portion is disposed inside the vehicle body under floor cover, and the opening for taking the running wind into the under floor covers on both sides of the heat radiating portion. A running wind cooling device for a railway vehicle, characterized by comprising: The traveling wind cooling device for a railway vehicle according to any one of claims 1 to 4, wherein a plurality of heat radiating portions are arranged, and cooling air obtained by a cooling means other than the traveling wind is taken into the heat radiating portions. A running wind cooling device for railway vehicles. 5. The traveling wind cooling apparatus for a railway vehicle according to any one of claims 1 to 4, wherein the shape of the underfloor cover opening is changed so that the width gradually increases in the vehicle traveling direction. A running wind cooling system for railway vehicles. The traveling wind cooling device for a railway vehicle according to any one of claims 1 to 4, wherein the ventilation direction of the heat radiating portion is arranged in parallel to the traveling direction of the vehicle. The traveling wind cooling device for a railway vehicle according to claim 1 or 2, wherein the inclination of the wind guide guide changes stepwise in a plan view, and the traveling wind is taken into the heat radiating portion.

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