Micro-channel heat dissipation device for train

Abstract

The invention discloses a micro-channel heat dissipation device mounted on a train, the device comprises a first air duct, a heat transfer mechanism and a second air duct, and the section of the first air duct from an inlet to an outlet is gradually reduced; the heat transfer mechanism is arranged at an outlet of the first air duct and comprises a ventilation pipe and cooling fins, the cooling fins are arranged on the periphery of the ventilation pipe, a plurality of heat exchange pipes are arranged in the ventilation pipe, and a heat-conducting medium circulates in micro-channels in the heat exchange pipes and is used for absorbing heat of heating equipment; the second air duct communicates with an outlet of the ventilation pipe; the pipe wall of the ventilation pipe communicates with an air inlet pipe, the air inlet pipe communicates with an outlet of the first air channel, and the section of the air inlet pipe is gradually reduced. According to the technical scheme, the heat dissipation device is installed on the train, air is sucked in through the first air channel, then the air flow speed is further increased through the air inlet pipe, the air rapidly flows in the ventilation pipe, the heat exchange efficiency of the air and the heat exchange pipe can be improved, and then heat generated by heating equipment of the train is discharged to the outside.

Description

Technical Field

[0001] The invention relates to the technical field of rail vehicle ventilation and cooling, and in particular to a microchannel heat dissipation device for a train. Background Art

[0002] The ventilation and cooling system is an important component of the train. Its function is to cool the traction system (such as the main transformer, main converter cabinet, traction motor, etc.) to ensure the safe operation of the traction system.

[0003] With the rapid development of science and technology, the power and power density of electrical appliances such as transformers, converters, and traction motors on trains are increasing, and the required heat dissipation and cooling power is also increasing. If traditional on-board cooling towers continue to be used, their heat dissipation, volume, weight, and noise will be difficult to meet the requirements of high-quality trains. Therefore, how to solve the problem of increasing heating of electrical appliances on locomotives is a technical difficulty that the industry urgently needs to solve. Summary of the invention

[0004] The main purpose of the present invention is to provide a microchannel heat dissipation device for trains, aiming to solve the technical problem of heat dissipation of heating equipment in trains.

[0005] To achieve the above object, the present invention proposes a microchannel heat dissipation device for trains, which is installed on trains. The microchannel heat dissipation device for trains comprises: a first air duct, wherein the cross section of the first air duct gradually decreases from the inlet to the outlet; a heat transfer mechanism, arranged at the outlet of the first air duct, the heat transfer mechanism comprising a ventilation pipe and a heat sink, the heat sink being arranged on the outer periphery of the ventilation pipe, a plurality of heat exchange pipes being arranged inside the ventilation pipe, a heat transfer medium circulates in the microchannel inside the heat exchange pipe for absorbing the heat of the heat generating device; and, a second air duct, the second air duct being connected to an outlet of the ventilation duct; The pipe wall of the ventilation pipe is connected to an air inlet pipe, the air inlet pipe is connected to the outlet of the first air duct, and the cross-section of the air inlet pipe gradually decreases.

[0006] Optionally, a plurality of ventilation pipes are provided, and each ventilation pipe is horizontally arranged and parallel to each other.

[0007] Optionally, the heat exchange tubes in each ventilation tube are connected in sequence, and the outer wall of each heat exchange tube is connected with a fin, and the fin is connected to the outer wall of the ventilation tube.

[0008] Optionally, the air inlet pipes on each of the ventilation pipes are arranged in a staggered manner.

[0009] Optionally, an inclined plate is provided in each ventilation duct near the air inlet duct to guide the air to be discharged toward the outlet of the ventilation duct.

[0010] Optionally, the first air duct is installed on the top of the train, the first air duct is arranged along the length direction of the train, and the second air duct is arranged along the width direction of the train.

[0011] Optionally, the heat transfer mechanism includes an upper cover and a lower cover, and the heat sink is respectively connected to the upper cover and the lower cover.

[0012] Optionally, the first air duct is arranged on the front side of the heat sink.

[0013] Optionally, two second air ducts are provided, respectively disposed on the left and right sides of the heat sink.

[0014] Optionally, outlets of the ventilation pipes extend out from the left and right sides of the heat sink, respectively.

[0015] In the technical solution of the present invention, the heat dissipation device is installed on the train, air is sucked in through the first air duct, and the air flow rate is further increased by using the air inlet pipe. The air flows rapidly in the ventilation pipe, which can speed up the heat exchange efficiency between the air and the heat exchange pipe, and then discharge the heat generated by the train's heating equipment to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0017] Figure 1 A three-dimensional structural diagram of an embodiment of a heat exchange device in a microchannel heat dissipation device for a train provided by the present invention; Figure 2 for Figure 1 The main view without the first air duct; Figure 3 for Figure 1 A front view of a part of the structure of the heat transfer mechanism; Figure 4 for Figure 1 A left view of a part of the structure of the heat transfer mechanism; Figure 5 for Figure 3 A cross-sectional view of a section of the central vent pipe; Figure 6 for Figure 3 A cross-sectional view of another section of the central vent pipe.

[0018] In the figure: microchannel heat dissipation device 100 for train, first air duct 1, heat transfer mechanism 2, ventilation pipe 21, inlet 21a, outlet 21b, heat sink 22, heat sink plate 221, air inlet pipe 23, heat exchange pipe 24, fin 25, inclined plate 26, vertical plate 27, small hole 271, annular raised wall 272, annular gap 273, upper cover 28, lower cover 29, second air duct 3, flange 31.

[0019] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0021] In order to better describe and illustrate the embodiments of the present application, reference may be made to one or more drawings, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of the invention of the present application, any of the currently described embodiments or preferred methods.

[0022] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" are based on the positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention. They do not indicate that the device referred to must have a specific direction or operate in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0024] With the rapid development of science and technology, the power and power density of electrical appliances such as transformers, converters, and traction motors on trains are increasing, and the required heat dissipation and cooling power is also increasing. If traditional on-board cooling towers continue to be used, their heat dissipation, volume, weight, and noise will be difficult to meet the requirements of high-quality trains.

[0025] In view of this, the present invention proposes a microchannel heat dissipation device for trains. Figure 1-6For an embodiment of the microchannel heat dissipation device for trains provided by the present invention, please refer to Figure 1-6 The train microchannel heat dissipation device 100 is installed on the train, and includes a first air duct 1, a heat transfer mechanism 2 and a second air duct 3.

[0026] Specifically, the cross-sectional area from the inlet to the outlet of the first air duct 1 gradually decreases. When air is sucked in, the air flow rate will increase due to the reduction of the air duct cross-section; the heat transfer mechanism 2 is arranged at the outlet of the first air duct 1, which includes a ventilation pipe 21 and a heat sink 22. The heat sink 22 is arranged on the outer periphery of the ventilation pipe 21 to transfer the heat of the ventilation pipe 21. A plurality of heat exchange tubes 24 are arranged inside the ventilation pipe 21. A heat transfer medium flows through the microchannels inside the heat exchange tube 24. The heat transfer medium absorbs the heat generated by the heating device and stores the heat in the liquid heat transfer medium. The heat transfer medium circulates in the heat exchange tube 24 and transfers the heat to the heat exchange tube 24; the second air duct 3 is connected to the outlet 21b of the ventilation pipe 21. When the air enters the ventilation pipe 21 and contacts the heat exchange tube 24, it can take away the heat on the tube wall, and then take away the heat of the heat transfer medium. In order to increase the air flow rate, the wall of the ventilation pipe 21 is connected to an air inlet pipe 23, one end of the air inlet pipe 23 is connected to the outlet of the first air duct 1, and the other end is connected to the inlet 21a of the ventilation pipe 21. The cross-sectional area of ​​the air inlet pipe 23 gradually decreases. When the air enters the ventilation pipe 21 from the air inlet pipe 23, the flow rate is further accelerated. It should be noted that the heat-generating device absorbs its heat through the heat-conducting medium, and the heat-conducting medium is circulated in the heat exchange pipe 24 through a pump.

[0027] In the technical solution of the present invention, the heat dissipation device 100 is installed on the train, and air is sucked in through the first air duct 1. The air flow rate is further increased by using the air inlet pipe 23. The air flows rapidly in the ventilation pipe 21, which can speed up the heat exchange efficiency between the air and the heat exchange pipe 24, and then discharge the heat generated by the train's heating equipment to the outside.

[0028] In order to allow the microchannels in the heat exchange tube 24 to fully contact the air, please refer to Figure 3 In one embodiment of the present invention, a plurality of ventilation pipes 21 are provided, and each ventilation pipe 21 is horizontally arranged and parallel to each other. This arrangement can make full use of the limited space. When air enters each ventilation pipe 21 from the outlet of the first air duct 1, it can contact all the heat exchange tubes 24.

[0029] Further, in order to better transfer the heat of the heat exchange tube 24, please refer to Figure 3 and Figure 5In one embodiment of the present invention, the heat exchange tubes 24 in each ventilation tube 21 are connected in sequence to form a serpentine distribution, and the outer wall of each heat exchange tube 24 is connected with a fin 25, which is connected to the outer wall of the ventilation tube 21. The fin 25 can also transfer the heat of the heat exchange tube 24 to the ventilation tube 21, and the ventilation tube 21 then transfers the heat to the heat sink 22, and the heat is taken away by the air outside the ventilation tube 21. In this embodiment, 7 heat exchange tubes 24 are fixed in the ventilation tube 21 through the fins 25; and the heat exchange tubes 24 and the ventilation tube 21 are preferably made of metal copper, which is conducive to rapid heat transfer.

[0030] To avoid interference with the air inlet pipe 23, please refer to Figure 2 and 3 In one embodiment of the present invention, the air inlet pipes 23 on each ventilation pipe 21 are staggered, which can effectively utilize the space and reduce the volume of the heat transfer mechanism 2.

[0031] As the position of the air inlet pipe 23 changes, the outlet 21b of the ventilation pipe 21 also changes accordingly. Figure 4-6 In one embodiment of the present invention, the outlet 21b of each ventilation pipe 21 is located at one of its two ends. Figure 6 Each ventilation pipe 21 is provided with an inclined plate 26 near the air inlet pipe 23. The inclined plate 26 is connected to the inner wall of the ventilation pipe 21 and the outer wall of each heat exchange pipe 24, blocking the air from being discharged in the direction shorter than one end of the heat exchange pipe 24 and turning it to be discharged in the direction farther from the other end of the heat exchange pipe 24, thereby making the air contact more with the heat exchange pipe 24 and guiding the air to be discharged toward the outlet 21b of the ventilation pipe 21. In order to make the air contact the outer wall of the heat exchange pipe 24 more fully, please refer to Figure 6 A vertical plate 27 is also provided beside the inclined plate 26. The vertical plate 27 is connected to the inner wall of the ventilation pipe 21. The vertical plate 27 is provided with a plurality of small holes 271 corresponding to the heat exchange pipes 24 passing through. Each small hole 271 is provided with an annular protruding wall 272 in the direction of air discharge. An annular gap 273 is formed between the annular protruding wall 272 and the outer wall of the heat exchange pipe 24, which is used to bundle the fluid together when the air passes through, so that it flows on the outer wall of the heat exchange pipe 24. Preferably, the cross-sectional area of ​​the annular protruding wall 272 gradually decreases, and its slope α=l / r, where l is the length from the small hole 271 to the outlet of the ventilation pipe 21, and r is the radius of the small hole 271.

[0032] To enable the heat dissipation device 100 to capture more air volume, please refer to Figure 1In one embodiment of the present invention, the first air duct 1 is installed on the top of the train, and the first air duct 1 is arranged along the length direction of the train, and its inlet and outlet are also arranged at both ends of its length direction. When the train is running, air can enter through the inlet of the first air duct 1 and then be discharged from the outlet. It should be noted that the first air duct 1 can be formed as a part of the train shell, or it can be arranged separately. In order to generate suction, a fan can also be arranged in the first air duct 1 to capture a larger amount of air. In addition, the second air duct 3 is arranged along the width direction of the train. When the air enters the heat transfer mechanism 2 from the first air duct 1, it undergoes heat exchange and then enters the second air duct 3 to be discharged to the left and right sides of the train. Preferably, the cross-sectional area of ​​the second air duct 3 is gradually reduced, so that the air after heat exchange is sprayed to the left and right sides of the train, avoiding the hot air from being captured by the first air duct 1 again, thereby improving the heat exchange efficiency of the heat exchange mechanism.

[0033] To prevent the air entering the heat transfer mechanism 2 from leaking out, refer to Figure 1 and Figure 2 In one embodiment of the present invention, the heat transfer mechanism 2 includes an upper cover 28 and a lower cover, the heat sink 22 is composed of a plurality of metal heat sink plates 221, each of which is arranged horizontally, the ventilation pipe 21 and its air inlet pipe 23 are both embedded in each of the metal heat sink plates 221, wherein the upper and lower metal heat sink plates 221 are respectively connected to the upper cover 28 and the lower cover 29. In addition, the first air duct 1 is arranged at the front side of the heat sink 22, that is, the front side of each of the metal heat sink plates 221, the outlet of the first air duct 1 is respectively connected to the upper cover 28 and the lower cover 29, and the front side of the heat sink 22 is sealed; the second air duct 3 is provided with two, which are respectively installed on the left and right sides of the heat sink 22 through the flange 31, and the left and right sides of the heat sink 22 are sealed.

[0034] To facilitate the hot air after heat exchange to enter the second air duct 3, please refer to Figure 2 In one embodiment of the present invention, each ventilation duct 21 extends along the width direction of the train, and the outlet 21 b of each ventilation duct 21 extends out from the left and right sides of the heat sink 22 alternately to be connected to the second air duct 3 .

[0035] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A microchannel heat dissipation device for a train, installed on a train, characterized in that: include: a first air duct, wherein the cross section of the first air duct gradually decreases from the inlet to the outlet; a heat transfer mechanism, arranged at the outlet of the first air duct, the heat transfer mechanism comprising a ventilation pipe and a heat sink, the heat sink being arranged on the outer periphery of the ventilation pipe, a plurality of heat exchange pipes being arranged inside the ventilation pipe, a heat transfer medium circulates in the microchannel inside the heat exchange pipe for absorbing the heat of the heat generating device; and, a second air duct, the second air duct being connected to an outlet of the ventilation duct; The pipe wall of the ventilation pipe is connected to an air inlet pipe, the air inlet pipe is connected to the outlet of the first air duct, and the cross-section of the air inlet pipe gradually decreases.

2. The microchannel heat dissipation device for trains according to claim 1, characterized in that: There are multiple ventilation pipes, and each ventilation pipe is horizontally arranged and parallel to each other.

3. The microchannel heat dissipation device for trains as claimed in claim 2, characterized in that: The heat exchange tubes in each of the ventilation tubes are connected in sequence, and the outer wall of each of the heat exchange tubes is connected with a fin, and the fin is connected to the outer wall of the ventilation tube.

4. The microchannel heat dissipation device for trains as claimed in claim 2, characterized in that: The air inlet pipes on each of the ventilation pipes are arranged in a staggered manner.

5. The microchannel heat dissipation device for trains as claimed in claim 2, characterized in that: An inclined plate is provided in each ventilation pipe near the air inlet pipe to guide the air to be discharged toward the outlet of the ventilation pipe.

6. The microchannel heat dissipation device for trains as claimed in claim 2, characterized in that: The first air duct is installed on the top of the train, the first air duct is arranged along the length direction of the train, and the second air duct is arranged along the width direction of the train.

7. The microchannel heat dissipation device for trains as claimed in claim 2, characterized in that: The heat transfer mechanism comprises an upper cover and a lower cover, and the heat sinks are respectively connected to the upper cover and the lower cover.

8. The microchannel heat dissipation device for trains as claimed in claim 7, characterized in that: The first air duct is arranged on the front side of the heat sink.

9. The microchannel heat dissipation device for trains as claimed in claim 7, characterized in that: The second air ducts are provided with two, which are respectively arranged on the left and right sides of the heat sink.

10. The microchannel heat dissipation device for trains according to claim 9, characterized in that: The outlets of the ventilation pipes extend out from the left and right sides of the heat sink respectively.

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